Shield scale-imitated micro-texture mechanical sealing structure with phase change inhibition function and stirrer

Abstract

The invention discloses a shield scale-imitating micro-texture mechanical sealing structure with a phase change inhibition function. The shield scale-imitating micro-texture mechanical sealing structure comprises a sealing ring, a through hole is formed in the middle of the sealing ring, a sealing end face is arranged at the end of the sealing ring, a plurality of placoid scale imitating modules are arranged on the sealing end face, and a guide groove extending in the radial direction is formed between every two adjacent placoid scale imitating modules. A plurality of groups of imitated placoid scale grooves are distributed in each imitated placoid scale module along the radial direction of the sealing ring, and the imitated placoid scale grooves in each group are communicated end to end along the circumferential direction of the sealing end surface; the outward end of the guide groove penetrates through the side face of the sealing end face, and the inward end of the guide groove is separated from the through hole. And the placoid scale imitating groove is communicated with the guide groove. According to the scheme, vapor-liquid phase change of the fluid film can be inhibited to a certain extent, the stability of the fluid film can be enhanced, contact abrasion of the sealing end face is reduced, and the service life of the sealing structure is prolonged.

Description

Technical Field

[0001] This invention relates to a stirrer, specifically a mechanical seal structure with a shield-scale micro-textured structure that has phase change suppression function. Background Technology

[0002] During the operation of a mechanical seal, the fluid film formed between the sealing end faces plays a crucial role in lubrication and media isolation. However, under extreme conditions such as high speed, high pressure differential, or high temperature, the fluid film is prone to local pressure reduction and temperature increase, inducing vapor-liquid phase change, which can lead to film rupture, cavitation, increased vibration, and even seal failure. Phase change not only weakens lubrication but also exacerbates end face wear and shortens seal life. Therefore, effectively suppressing phase change phenomena in the end face fluid film has become one of the key technical challenges in improving seal reliability and long service life. The shield-scale microtexture structure proposed in this study optimizes the local flow field and pressure distribution at the microscale, thereby suppressing the formation of low-pressure zones and the occurrence of phase change processes, providing a new technical means for the stable operation of mechanical seals.

[0003] In nature, shark skin is covered with numerous tiny dermal denticles (also known as barodonts). Their unique arrangement and surface microstructure effectively reduce water flow resistance and suppress turbulence during high-speed swimming, and to some extent, mitigate bubble adhesion and vaporization. Inspired by this biomimetic phenomenon, researchers have recently introduced shark-dermal denticle-inspired structures into the field of fluid engineering to optimize surface flow characteristics and heat transfer performance. However, in the high-temperature, high-pressure, and fluid film phase transition-prone conditions of mechanical seal end faces, systematic design and functional verification of shark-dermal denticle-inspired microstructures are still lacking. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a shield-scale micro-textured mechanical seal structure and agitator with phase change suppression function, which can suppress the vapor-liquid phase change of the fluid film to a certain extent, help enhance the stability of the fluid film, reduce contact wear on the sealing end face, and extend the service life of the sealing structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a shield-scale micro-textured mechanical seal structure with phase change suppression function, comprising a sealing ring; the sealing ring has a through hole in the middle and a sealing end face at the end, the sealing end face is provided with a plurality of shield-scale modules, and a radially extending guide groove is provided between adjacent shield-scale modules; each shield-scale module has a plurality of shield-scale grooves radially distributed along the sealing ring, and the shield-scale grooves in each group are connected end to end along the circumference of the sealing end face; the outward end of the guide groove penetrates the side of the sealing end face, and the inward end is blocked by the through hole; the shield-scale grooves are connected to the guide groove.

[0006] As a further improvement of the present invention, each of the simulated shield scale modules has at least three sets of simulated shield scale grooves distributed radially, with the outermost set being staggered from the inner sets.

[0007] As a further improvement of the present invention, the head of the simulated shield scale groove is arc-shaped, and the tail includes a trapezoidal segment, a triangular segment and a trapezoidal segment in sequence from the outside to the inside along the radial direction of the sealing ring; the arc of the head connects the edges of the two trapezoidal segments respectively.

[0008] As a further improvement of the present invention, a planar transition portion is provided between the trapezoidal segment and the triangular segment.

[0009] As a further improvement of the present invention, when the plurality of the simulated shield scale grooves are connected end to end, the arc shape of the head and the triangular segment of the tail are connected.

[0010] As a further improvement of the present invention, when multiple of the simulated shield-scale grooves are connected end to end, two trapezoidal segments alternately connect with the arc of the head to form a reciprocating radial misaligned connection.

[0011] As a further improvement of the present invention, the heads of the two sets of simulated shield scale grooves near the through hole are connected to the guide grooves corresponding to the heads, and the tails of the outermost set of simulated shield scale grooves are connected to the guide grooves corresponding to the tails.

[0012] As a further improvement of the present invention, when the tail of the imitation shield scale groove is connected to the guide groove, the trapezoidal segment and the triangular segment of the tail are both connected to the guide groove; when the head of the imitation shield scale groove is connected to the guide groove, the arc shape of the head is connected to the guide groove.

[0013] As a further improvement of the present invention, the guide groove is a strip-shaped groove, and its length direction passes through the center of the sealing ring.

[0014] As a further improvement of the present invention, the sealing ring is a stationary ring that cooperates with the moving ring.

[0015] A stirrer includes a drive component, a rotating shaft that rotates in conjunction with the drive component, a stirring paddle mounted on the rotating shaft, and a connecting frame for mounting the drive component onto an external container; characterized in that a mechanical seal structure with a simulated shield-scale micro-texture as described in any one of the above is provided on the rotating shaft at a position corresponding to the container, for sealing the gap between the stirring shaft and the container.

[0016] The beneficial effects of this invention are: By incorporating a shield-scale-like module and radial guide grooves on the sealing end face, with the guide grooves connecting the outer high-pressure zone at one end and isolating the through-hole at the other, an orderly flow path is provided for the fluid, guiding it to flow in the desired direction. Multiple sets of circumferentially connected grooves distributed radially within the shield-scale-like module are connected to the guide grooves, allowing the fluid to diffuse uniformly within the grooves. This optimizes the pressure and velocity distribution of the fluid on the sealing end face, reduces the formation of localized low-pressure and high-temperature regions, and thus, to some extent, suppresses the vapor-liquid phase change of the fluid film. Simultaneously, this structure helps enhance fluid film stability, reduces contact wear on the sealing end face, and extends the service life of the sealing structure. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural view of the continuous connection of the simulated shield-scale grooves of the present invention; Figure 2 This is a planar structural view of the continuous connection of the simulated shield-scale grooves of the present invention; Figure 3 This is a three-dimensional structural view of the simulated shield scale groove misalignment connection of the present invention; Figure 4 This is a planar structural view of the simulated shield-scale groove misalignment connection of the present invention; Figure 5 This is a schematic diagram of the module with continuous connection of the simulated shield scale grooves of the present invention; Figure 6 This is a schematic diagram of the module with the simulated shield scale groove misalignment connection of the present invention.

[0018] Figure 7 This is a schematic diagram of the shield-scale groove structure of the present invention; Figure 8 This is a diagram showing experimental data of the liquid-like and vapor-like phases of the simulated shield-scale grooves of the present invention; Figure 9 Figures showing existing experimental data for liquid-like and vapor-like phases in spiral grooves; Figure 10 Figures showing existing experimental data for the double-row stepped liquid-like and vapor-like phases; Figure 11 Figures showing existing experimental data for liquid-like and vapor-like phases in herringbone tanks; Figure 12 Figures showing existing experimental data for liquid-like and vapor-like phases in dovetail grooves; Figure 13 A diagram showing the vapor phase temperature range for different groove-type mechanical seals; Figure 14 This is a diagram showing the relative error between the reduction in the vapor phase region range of the shield-scale groove and other groove-shaped vapor phase regions.

[0019] Reference numerals: 1. Sealing ring; 2. Through hole; 3. Sealing end face; 4. Shield-scale module; 41. Shield-scale groove; 411. Trapezoidal segment; 412. Triangular segment; 413. Planar transition section; 5. Guide groove. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0021] Reference Figure 1-14 As shown, A micro-textured mechanical seal structure with phase change suppression function includes a sealing ring 1; the sealing ring 1 has a through hole 2 in the middle and a sealing end face 3 at the end, and a plurality of micro-textured shield scale modules 4 are provided on the sealing end face 3, and a radially extending guide groove 5 is provided between adjacent micro-textured shield scale modules 4; each micro-textured shield scale module 4 has a plurality of sets of micro-textured shield scale grooves 41 radially distributed along the sealing ring 1, and the micro-textured shield scale grooves 41 in each set are connected end to end along the circumference of the sealing end face 3; the outward end of the guide groove 5 penetrates the side of the sealing end face 3, and the inward end is blocked from the through hole 2; the micro-textured shield scale grooves 41 are connected to the guide groove 5.

[0022] The sealing ring 1 can be a stationary ring. The through hole 2 of the sealing ring 1 can be used to pass through shaft components. The sealing end face 3 and the mating part (such as the rotating ring) form a sealing pair, and a fluid film is formed between them to achieve lubrication and isolation. The simulated shield scale modules 4 are evenly distributed on the sealing end face 3. The guide groove 5 between adjacent simulated shield scale modules 4 extends radially. Its outward end is connected to the high-pressure side on the outer side of the sealing end face 3. Although the inward end is blocked by the through hole 2, it can indirectly guide the fluid flow through the simulated shield scale groove 41. The simulated shield scale groove 41 connected end to end in the inner circumference of each group is connected to the guide groove 5, so that the fluid on the high-pressure side can enter the simulated shield scale groove 41 through the guide groove 5 and diffuse circumferentially under the guidance of the simulated shield scale groove 41. This optimizes the fluid pressure and velocity distribution on the sealing end face 3 to a certain extent, reduces the formation of local low-pressure and high-temperature areas, and thus helps to suppress the vapor-liquid phase change of the fluid film. At the same time, the cooperation between the simulated shield scale module 4 and the guide groove 5 can enhance the stability of the fluid film to a certain extent, reduce end face wear, and extend the service life of the sealing structure.

[0023] Preferably, each shield-scale module 4 has at least three sets of shield-scale grooves 41 distributed radially, with the outermost set staggered from the inner sets. This staggered arrangement forms flow channels and local pressure gradients, effectively controlling the fluid pressure distribution and flow direction on the sealing end face 3. This enhances the local dynamic pressure effect at the microscale, optimizes fluid lubrication, and reduces end face contact wear, thereby significantly improving the wear resistance of the sealing structure and extending its service life.

[0024] Three sets are a more moderate number of options, and the number of sets can be increased, and can be selected according to the size of the sealing end face 3.

[0025] In the specific structure, the head of the shield-scale groove 41 is arc-shaped, and the tail includes a trapezoidal segment 411, a triangular segment 412, and another trapezoidal segment 411 in sequence from the outside to the inside along the radial direction of the sealing ring 1; the arc of the head connects the edges of the two trapezoidal segments 411 respectively. A planar transition portion 413 is provided between the trapezoidal segment 411 and the triangular segment 412.

[0026] The way the imitation shield scale grooves 41 in the same group are connected end to end can be implemented in the following two ways: 1.Reference Figure 1 , 2 As shown in Figure 5, when multiple imitation shield-scale grooves 41 are connected end to end, the arc shape at the head and the triangular segment 412 at the tail are connected. This connection method allows adjacent grooves to form a continuous circumferential flow channel. After the fluid flows out of the triangular segment 412 at the tail of one groove, it can smoothly enter the arc shape at the head of the next groove, reducing flow resistance. The continuous channel makes the fluid more evenly distributed circumferentially, reduces local low-pressure areas, and to a certain extent suppresses vapor-liquid phase change, improving the stability of the seal.

[0027] 2.Reference Figure 3 , 4 As shown in Figure 6, when multiple imitation shield-scale grooves 41 are connected end to end, two trapezoidal segments 411 alternately connect with the arc of the head, forming a reciprocating radial misaligned connection. This misaligned connection causes the fluid to reciprocate radially while flowing circumferentially, increasing the degree of fluid disturbance, making the heat distribution more uniform, alleviating local high temperatures, reducing the possibility of forming low-pressure areas in specific radial regions, enhancing the suppression effect of phase change, and the disturbed fluid can better fill the gap of the sealing end face 3, improving the lubrication effect and reducing wear.

[0028] Specifically, the heads of the two sets of simulated shield scale grooves 41 near the through hole 2 are connected to the guide grooves 5 corresponding to the heads, and the tail of the outermost set of simulated shield scale grooves 41 is connected to the guide grooves 5 corresponding to the tail.

[0029] When the tail of the imitation shield scale groove 41 is connected to the guide groove 5, the trapezoidal segment 411 and the triangular segment 412 of the tail are both connected to the guide groove 5; when the head of the imitation shield scale groove 41 is connected to the guide groove 5, the arc of the head is connected to the guide groove 5.

[0030] The purpose of the above design is to establish an orderly flow path between the high-pressure inlet and the simulated shield-scale module, which helps guide the fluid on the sealed end face to flow in the desired direction. If the simulated shield-scale module 4 is closed (not connected to the guide groove 5), fluid stagnation is likely to occur, affecting the dynamic pressure effect and heat dissipation. Furthermore, the conductive structure can mitigate the pressure drop phenomenon within the closed microcavity, further suppressing phase change.

[0031] In the preferred embodiment, the guide groove 5 is a strip-shaped groove, and its length direction passes through the center of the sealing ring 1. The strip-shaped design has a simple structure, is easy to manufacture, and provides a shorter and smoother path for the fluid to flow radially, thus improving the flow guiding efficiency.

[0032] Reference Figures 8-14 Provide specific information on the comparison of different slot types.

[0033] Note: The simulation medium is liquid oxygen, which is produced by... Figures 8-14 As shown in Tables 1-5, from a medium temperature of 90K, the fluid film at the interface of the mechanical seal with all five groove types undergoes a phase change. Those skilled in the art know that when the fluid film is in a liquid-like phase, the mechanical seal can operate stably; however, when the fluid film is in a vapor-like phase, the mechanical seal is highly susceptible to instability. Figure 13 As shown in Table 6, compared with the other four groove types, the temperature of the medium that changes from the liquid phase to the vapor phase in the simulated shield scale microtextured mechanical seal proposed in this scheme is significantly increased, and the temperature range of the vapor phase region is significantly reduced. Compared with the other four groove types, the temperature range of the vapor phase region of the simulated shield scale groove in this scheme is reduced by 38.24%, 19.23%, 34.38%, and 38.24%, respectively, indicating that the patented groove type can suppress the phase change of the interfacial fluid film to a certain extent.

[0034] The above describes a sealing structure, which, when applied to a mixer, can form the following technical solution: a mixer includes a driving component, a rotating shaft that rotates in conjunction with the driving component, a stirring paddle mounted on the rotating shaft, and a connecting frame for mounting the driving component onto an external container; the rotating shaft is provided with a mechanical seal structure with a simulated shield scale micro-texture as described above at a position corresponding to the container, for sealing the gap between the stirring shaft and the container.

[0035] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A mechanical seal structure with a simulated shield-scale micro-texture and phase change suppression function, comprising a sealing ring; the sealing ring having a through hole in the middle and a sealing end face at its end, characterized in that, The sealing end face is provided with a plurality of shield-scale-like modules, and a radially extending guide groove is provided between adjacent shield-scale-like modules; each shield-scale-like module is radially distributed with a plurality of shield-scale-like grooves, and the shield-scale-like grooves in each group are connected end to end along the circumference of the sealing end face; the outward end of the guide groove penetrates the side of the sealing end face, and the inward end is blocked by the through hole; the shield-scale-like grooves are connected to the guide groove.

2. The simulated shield-scale micro-textured mechanical seal structure according to claim 1, characterized in that, Each of the simulated shield scale modules has at least three sets of simulated shield scale grooves distributed radially, with the outermost set being staggered from the inner sets.

3. The simulated shield-scale micro-textured mechanical seal structure according to claim 2, characterized in that, The head of the simulated shield-scale groove is arc-shaped, and the tail includes a trapezoidal segment, a triangular segment, and a trapezoidal segment in sequence from the outside to the inside along the radial direction of the sealing ring; the arc of the head connects the edges of the two trapezoidal segments respectively.

4. The simulated shield-scale micro-textured mechanical seal structure according to claim 3, characterized in that, A planar transition section is provided between the trapezoidal segment and the triangular segment.

5. The simulated shield-scale micro-textured mechanical seal structure according to claim 3, characterized in that, When multiple of the aforementioned shield-scale grooves are connected end to end, the arc shape of the head and the triangular segment of the tail are connected.

6. The simulated shield-scale micro-textured mechanical seal structure according to claim 3, characterized in that, When multiple of the aforementioned shield-scale grooves are connected end to end, two trapezoidal segments alternately connect with the arc of the head, forming a reciprocating radial misaligned connection.

7. The simulated shield-scale micro-textured mechanical seal structure according to claim 5 or 6, characterized in that, The heads of the two sets of simulated shield scale grooves near the through hole are connected to the guide grooves corresponding to the heads, and the tail of the outermost set of simulated shield scale grooves is connected to the guide grooves corresponding to the tails.

8. The simulated shield-scale micro-textured mechanical seal structure according to claim 7, characterized in that, When the tail of the simulated shield scale groove is connected to the guide groove, the trapezoidal segment and the triangular segment of the tail are both connected to the guide groove; when the head of the simulated shield scale groove is connected to the guide groove, the arc shape of the head is connected to the guide groove.

9. The simulated shield-scale micro-textured mechanical seal structure according to claim 1, characterized in that, The guide groove is a strip-shaped groove, and its length direction passes through the center of the sealing ring.

10. A stirrer, comprising a drive component, a rotating shaft that rotates in conjunction with the drive component, a stirring paddle mounted on the rotating shaft, and a connecting frame for mounting the drive component onto an external container; characterized in that, The rotating shaft is provided with a mechanical seal structure with a simulated shield scale microtexture as described in any one of claims 1 to 9 at the position corresponding to the container, for sealing the gap between the stirring shaft and the container.

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