CN106838323B - A kind of end surface mechanical sealing structure of imitative shark skin surface three-dimensional appearance - Google Patents

Abstract

An end face mechanical seal structure imitating the three-dimensional shape of the shark skin surface, including a moving ring or a static ring as a mechanical seal, the outer end of the sealing end face of the moving ring and the static ring is used as the high pressure side, that is, the upstream, and the inner end of the sealing end face is used as the low pressure side. Downstream, at least one sealing end face upstream of the moving ring or static ring is provided with a closed seal dam on the high pressure side upstream, and several upstream pumping grooves are evenly distributed on the surface of the sealing end face in the circumferential direction, and the first end of the upstream pumping groove extends to The high-pressure side of the sealing end face, the second end extends to the low-pressure side of the sealing end face; the area between two adjacent upstream pumping grooves is the sealing weir; the bottom of the groove and the surface of the sealing weir are processed with asperities imitating the surface topography of shark skin Clusters, the asperity clusters are arranged in dislocation until they evenly cover the entire sealing weir and the bottom of the upstream pumping groove, and the asperity clusters are composed of several asperity units parallel to each other. The beneficial effects of the invention are: the three-dimensional appearance of the imitation shark skin surface that prevents marine fouling organisms from adhering, reduces drag, wears wear, and strengthens heat dissipation.

Description

A mechanical seal structure on the end face imitating the three-dimensional shape of the shark skin surface

technical field

The invention belongs to the technical field of mechanical seal structure design, and in particular relates to an end face mechanical seal structure imitating the three-dimensional shape of the surface of shark skin.

Background technique

Compared with land, the marine environment has many particularities, so the working conditions of mechanical seals used in marine equipment are even harsher. In particular, the problem of marine biofouling has brought many hazards to the mechanical seals used in offshore equipment. Marine fouling organisms will adhere to the friction pairs of mechanical seals, which will accelerate the corrosion and wear of the seal end faces, resulting in mechanical seals. The sealing performance of the seal will be reduced, the service life will be shortened, and in severe cases, the mechanical seal will fail. In response to this situation, it is necessary to study a mechanical seal device that prevents marine fouling organisms from adhering, so that the mechanical seal is minimized by marine fouling organisms during operation, thereby increasing the wear resistance and corrosion resistance of the seal. , prolong its service life.

At present, many studies have shown that the epidermis of sharks, large marine mammals, has complex surface topography, and the topography of these biological surfaces can effectively prevent or inhibit biological attachment. According to the mechanism of shark protection against seabed organisms, Brennan et al., Scardino, De Nys and Magin et al. developed SharkletAFTM microstructure materials by etching and turning over the mold, which proved that it can effectively prevent algae, barnacles, etc. from fouling marine organisms. , and its adhesion rate is reduced by about 85%.

According to the mechanism of the surface topography of shark skin imitating the adhesion of marine fouling organisms, an end face mechanical seal structure imitating the surface topography of shark skin can be designed to prevent or inhibit the adhesion of marine organisms, thereby increasing the wear resistance and durability of the seal. Corrosion, the purpose of prolonging the service life.

Contents of the invention

Aiming at the defects or deficiencies that the end face seals currently used in the ocean are susceptible to marine fouling organisms, the present invention provides a three-dimensional shark-skin-like surface that prevents marine fouling, reduces drag, wears wear, and enhances heat dissipation. End face mechanical seal structure.

The end face mechanical seal structure imitating the three-dimensional shape of the shark skin surface according to the present invention includes a moving ring and a static ring of the mechanical seal, and the outer end of the sealing end face of the moving ring and the static ring is used as the high pressure side, that is, the upstream , the inner end of the sealing end face is regarded as the low-pressure side, that is, downstream, and it is characterized in that: the high-pressure side upstream of at least one sealing end face in the moving ring or the static ring is provided with a circle of closed sealing dams, and several seal dams are evenly distributed on the surface of the sealing end face in the circumferential direction. An upstream pumping groove, the first end of the upstream pumping groove extends to the high-pressure side of the sealing end surface, and the second end extends to the low-pressure side of the sealing end surface; the area between two adjacent upstream pumping grooves is a sealing weir; The bottom of the upstream pumping groove and the surface of the sealing weir are processed with asperity clusters imitating the surface topography of shark skin, and the asperity clusters are arranged in dislocation until they evenly cover the entire sealing weir and the bottom of the upstream pumping groove. The asperity cluster is composed of several asperity units parallel to each other.

The asperity cluster consists of several asperity units arranged in parallel along its short axis direction, and the length of the same group of asperity units gradually decreases from the center to both ends along the short axis direction; The asperity clusters are connected end to end along the short axis direction, and the straight line where the short axis of the asperity clusters on the surface of the sealing weir passes through the center of the seal end face; the short axis refers to the central axis of the asperity cluster and the asperity unit Vertical axis of symmetry; major axis refers to the central axis of the longest asperity unit in the asperity cluster.

A plurality of upstream pumping grooves are evenly distributed along the circumference of the sealing end surface, and the upstream pumping grooves are smooth circular arc grooves with the same bending direction, and the notch at the second end of the upstream pumping groove is wider than the notch at the first end.

The direction of the long axis of the asperity clusters on the bottom surface of the upstream pumping groove is consistent with the guide direction of the circular arc groove, and the long axis direction of the asperity clusters on the surface of the sealing weir is consistent with the base circle where the arc groove is located. The tangent direction of the circle is the same.

The cross-section of the asperity unit is a combined shape of a rectangle and two semicircles, the straight line where the center of the two semicircles of the asperity unit coincides with the long axis of the asperity unit, and the line connecting the centers of the two semicircles of the asperity unit The vertical line passes through the center of the sealing end face and coincides with the minor axis of the asperity unit.

The distance between the first end of the upstream pumping groove and the upstream of the end surface is 0.5-3 mm, and the groove depth is 0.1-1 mm.

The number of upstream pumping grooves uniformly distributed on the surface of the sealing end face is 3-25.

The gap between the asperity units in the same group of asperity clusters is 0.05-0.3 μm.

The present invention has the following beneficial effects:

1) On the bottom of the upstream pumping tank and the surface of the sealing weir, micron-scale asperity clusters imitating the three-dimensional shape of the surface of shark skin are processed, making it difficult for marine fouling organisms to attach to the sealing end surface, thereby preventing marine fouling organisms purpose of attachment.

2) Since there is a certain gap between the asperity clusters, the liquid can take away part of the frictional heat generated during the operation of the end face seal when the liquid passes through, so as to achieve the effect of strengthening heat dissipation.

3) The combination of the upstream pumping groove and the three-dimensional topography of the imitation shark skin surface can reduce friction power consumption, thereby achieving the effect of drag reduction.

4) The combination of the upstream pumping groove and the three-dimensional shape of the imitation shark skin surface can enhance the dynamic pressure effect and reduce wear, so as to achieve the effect of enhancing wear resistance and prolonging the service life.

Description of drawings

Fig. 1 is a schematic diagram of the present invention (A represents the high pressure side; B represents the low pressure side);

Fig. 2 is the top view of the present invention;

Fig. 3 is a schematic diagram of the asperity cluster of the present invention.

Detailed ways

Further illustrate the present invention below in conjunction with accompanying drawing

Referring to the attached picture:

Embodiment 1 The end face mechanical seal structure imitating the three-dimensional shape of the shark skin surface according to the present invention includes a moving ring and a static ring as a mechanical seal, and the outer end of the sealing end face of the moving ring and the static ring 1 As the high-pressure side A is the upstream, and the inner end of the sealing end face is the low-pressure side B, which is the downstream. In the moving ring or the static ring, at least one sealing end face upstream of the high-pressure side is provided with a closed sealing dam 2, and on the surface of the sealing end face Several upstream pumping grooves 5 are evenly distributed in the circumferential direction, the first end of the upstream pumping groove 5 extends to the high pressure side A of the sealing end surface, and the second end extends to the low pressure side B of the sealing end surface; two adjacent upstream pumping grooves The area between 5 is the sealing weir 3; the bottom of the upstream pumping groove 5 and the surface of the sealing weir 3 are processed with asperity clusters 4 imitating the surface morphology of shark skin, and the asperity clusters 4 are arranged in dislocation until Evenly covering the entire sealing weir 3 and the bottom of the upstream pumping groove 5, the asperity cluster 441 is composed of several asperity units parallel to each other.

The asperity cluster 4 is composed of several asperity units 41 arranged in parallel along its short axis direction, and the length of the same group of asperity units gradually decreases from the center to both ends along the short axis 7 direction; the surface of the sealing weir The adjacent asperity clusters are connected end-to-end along the short axis direction, and the straight line where the short axis of the asperity clusters on the surface of the sealing weir passes through the center of the seal end face; The axis of symmetry perpendicular to the central axis of the unit; the major axis 6 refers to the central axis of the longest asperity unit in the asperity cluster.

A plurality of upstream pumping grooves 5 are evenly distributed on the surface of the sealing end face along its circumferential direction, and the upstream pumping grooves 5 are smooth circular arc grooves with the same bending direction, and the second end notch of the upstream pumping groove 5 is larger than the first end notch. width.

The direction of the major axis 6 of the asperity clusters 4 on the bottom surface of the upstream pumping groove 5 is consistent with the guide direction of the circular arc groove, and the major axis direction of the asperity clusters on the surface of the sealing weir 3 is in line with the direction of the circular arc. The circumferential tangent direction of the base circle where the groove is located is consistent.

The cross-section of the asperity unit 41 is a combined shape of a rectangle and two semicircles, the straight line where the center of the two semicircles of the asperity unit coincides with the major axis of the asperity unit, and the line connecting the centers of the two semicircles of the asperity unit The perpendicular line of the seal end face passes through the center and coincides with the minor axis of the asperity unit.

The distance between the first end of the upstream pumping groove 5 and the upstream of the end surface is 0.5-3 mm, and the groove depth is 0.1-1 mm.

The number of upstream pumping grooves uniformly distributed on the surface of the sealing end face is 3-25.

The gap between the asperity units in the same group of asperity clusters 4 is 0.05-0.3 μm.

Specifically, the static ring is represented in Figure 1, but the dynamic ring is actually similar to it, and is not drawn here; the combination of the upstream pumping groove 5 and the three-dimensional topography of the imitation shark skin surface can reduce friction power consumption, thereby reducing friction The resistance of the friction pair during operation can achieve the effect of drag reduction. At the same time, the combination of the upstream pumping groove 5 and the three-dimensional shape of the imitation shark skin surface can increase the dynamic pressure effect, so that the wear rate of the friction pair during operation can be reduced. Achieve the effect of enhancing wear resistance and prolonging service life. There are gaps between the asperity clusters 4, which can increase the contact area between the liquid and the solid, increase the convective heat transfer between the solid and the liquid, and increase the heat taken away by the liquid flow, thereby achieving the effect of strengthening heat dissipation. At the same time, due to the existence of the asperity clusters 4 , it is difficult for marine fouling organisms to adhere to the sealing end surface, thereby achieving the purpose of preventing marine fouling organisms from adhering.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (8)

1. An end face mechanical seal structure imitating the three-dimensional shape of the shark skin surface, including a moving ring and a static ring as a mechanical seal, the outer end of the sealing end face of the moving ring and the static ring is used as the high pressure side, that is, upstream, and the inner end of the sealing end face As the low-pressure side, that is, the downstream, it is characterized in that: the high-pressure side upstream of at least one sealing end face of the moving ring or the static ring is provided with a closed sealing dam, and several upstream pumping grooves are evenly distributed on the surface of the sealing end face in the circumferential direction, The first end of the upstream pumping groove extends to the high-pressure side of the sealing end surface, and the second end extends to the low-pressure side of the sealing end surface; the area between two adjacent upstream pumping grooves is a sealing weir; the upstream pumping groove The bottom of the tank and the sealing weir are processed with asperity clusters imitating the surface topography of shark skin, and the asperity clusters are dislocated until they evenly cover the entire sealing weir and the bottom of the upstream pumping tank. Clusters consist of several asperities parallel to each other. 2. the end face mechanical seal structure of a kind of imitation sharkskin surface three-dimensional topography as claimed in claim 1, is characterized in that: described asperity cluster is arranged in parallel along its minor axis direction successively by several asperity units, And the length of the same group of asperity units gradually decreases from the center to both ends along the short axis direction; the adjacent asperity clusters on the sealing weir surface meet end to end along the short axis direction, and the asperity clusters on the sealing weir surface The straight line where the minor axis is located passes through the center of the sealing end face; the minor axis refers to the symmetry axis perpendicular to the central axis of the asperity unit in the asperity cluster; the major axis refers to the longest asperity unit in the asperity cluster The central axis. 3. A kind of end face mechanical seal structure imitating the three-dimensional appearance of shark skin surface as claimed in claim 2, it is characterized in that: the surface of the sealing end face is evenly distributed with a plurality of upstream pumping grooves along its circumference, and the upstream pumping grooves are curved Smooth arc grooves with consistent direction, and the second end slot of the upstream pumping slot is wider than the first end slot. 4. A kind of end face mechanical seal structure imitating the three-dimensional topography of sharkskin surface as claimed in claim 3, it is characterized in that: the long-axis direction of the asperities cluster on the groove bottom surface of the upstream pumping groove is in the same direction as the circle The diversion directions of the arc grooves are consistent, and the direction of the long axis of the asperity clusters on the surface of the sealing weir is consistent with the direction of the circumferential tangent of the base circle where the arc grooves are located. 5. A kind of end face mechanical seal structure imitating the three-dimensional appearance of shark skin surface as claimed in claim 3, it is characterized in that: the cross-section of described asperity unit is the combined shape of rectangle and two semicircles, and the asperity unit The straight line where the centers of the two semicircles of the body unit coincide with the long axis of the slightly convex body unit, and the perpendicular line of the line connecting the centers of the two semicircles of the slightly convex body unit passes through the center of the sealing end face and coincides with the short axis of the slightly convex body unit. 6. The end face mechanical seal structure imitating the three-dimensional appearance of shark skin surface as claimed in claim 5, characterized in that: the distance between the first end of the upstream pumping groove and the upstream of the end face is 0.5-3mm, The groove depth is 0.1-1mm. 7 . The end face mechanical seal structure imitating the three-dimensional shape of the shark skin surface as claimed in claim 6 , wherein the number of upstream pumping grooves uniformly distributed on the seal end face is 3-25. 8 . 8 . The end face mechanical seal structure imitating the three-dimensional shape of shark skin surface as claimed in claim 4 , wherein the gap between the asperity units in the same group of asperity clusters is 0.05-0.3 μm.