Mechanical seal ring with patterned surface properties

Abstract

In view of the problem in the prior art that the mechanical sealing performance is affected by the need to form a fluid film stiffness structure through subtractive manufacturing, the present invention provides a mechanical seal ring with patterned surface properties for liquid medium mechanical seal. Different from the prior art method of using grooves, waviness, taper, gradient and other height-changing patterns to generate fluid film stiffness to improve sealing performance, the sealing end face in the present invention is still a planar area at various locations. By surface treating the sealing end face, the sealing medium has different slip properties with the sealing end face when flowing in different areas on the sealing end face, thereby providing fluid film stiffness and avoiding the influence of the subtractive manufacturing method in the prior art on the mechanical sealing performance.

Description

Technical Field

[0001] The invention relates to the field of mechanical seals, and in particular to a mechanical seal ring with patterned surface properties. Background Art

[0002] Mechanical seal is a form of shaft end seal, which is widely used due to its excellent performance. People usually process micrometer-scale grooves, waviness, taper, steps and other end surface height variation patterns on the end surface of the mechanical seal ring to form fluid film stiffness during operation, so that the relative position of the two seal rings has a certain stability. In addition, a specific height variation pattern can produce a pumping effect or a reverse pumping effect under a stable small film thickness. By using this feature to pump the medium from the low-pressure side to the high-pressure side, it can partially or completely offset the leakage.

[0003] However, the processing of such highly variable patterns is very difficult due to their small size, especially the difficulty in controlling the accuracy, which also limits the design of the end face geometric features. The removal of material during processing can also cause the ring body to deform (micron-level deformation can have a significant impact in mechanical seals).

[0004] In the design of mechanical seals, it is usually necessary to first ensure that the relative position of the two sealing rings will not deviate too much from the expected design point due to errors or disturbances (in fact, deviations at the micron level will lead to significant changes in leakage and / or friction conditions). To achieve this goal, at least one of the two sealing rings is usually designed to be floatingly mounted: it can move more flexibly under the action of the sealing medium and the end face contact (if any), and one or both of the following two principles are used to ensure that a floatingly mounted sealing ring can maintain a relatively stable relative position with the other sealing ring:

[0005] One is to use a larger closing force that exceeds the medium pressure in the end face to make the two sealing rings contact and maintain fit;

[0006] Second, it imparts rigidity to the medium in the gap between the two sealing rings. Specifically, it imparts such a property to the medium in the gap: when the relative position of the two sealing rings changes, the pressure distribution of the medium changes, and the result is to suppress the change of the relative position of the two sealing rings. Traditional mechanical seal designs use height variation patterns such as grooves, waviness, tapers, and steps to produce such an effect.

[0007] For the first solution, ensuring the fit through contact will cause friction on the mechanical seal end face as it rotates, which will become increasingly unacceptable as the speed increases and the load increases. The seal ring will wear out rapidly in this case. For the second solution, since mechanical structures such as grooves, waviness, and tapers need to be formed through material removal processing, the relative accuracy is difficult to control due to the small scale, resulting in unstable performance. In addition, the pattern design is limited by the processing technology, and material needs to be removed during the processing, which may cause the ring body to deform. Summary of the invention

[0008] Based on this, it is necessary to provide a mechanical sealing ring with patterned surface properties to address the problem that in current mechanical sealing devices, a fluid film stiffness structure needs to be formed through subtractive manufacturing, thereby affecting the mechanical sealing performance.

[0009] The above purpose is achieved through the following technical solutions:

[0010] A mechanical sealing ring with patterned surface properties comprises a dynamic ring and a static ring, wherein the surfaces opposite to each other are sealing end faces, and the sealing end faces on the dynamic ring and / or the static ring comprise N regions in total from a first region to an Nth region, where N is a natural number not less than 2, and the first region to the Nth region are all plane regions, and the slippage of the sealing medium on the first region to the Nth region gradually increases.

[0011] In one embodiment, any region from the first region to the Nth region is a continuous region.

[0012] In one embodiment, the first region to the Nth region form a nested annular structure with the axis of the mechanical seal ring with the surface property pattern as the center.

[0013] In one embodiment, the slippage of a region relatively close to the axis is lower than the slippage of a region relatively far from the axis.

[0014] In one embodiment, any region among the first region to the Nth region is a non-continuous region.

[0015] In one embodiment, any region among the first region to the Nth region is evenly distributed along the circumference of the sealing end surface.

[0016] In one embodiment, any region among the second to Nth regions is composed of a plurality of arc-shaped sub-regions, and the shape and distribution of the arc-shaped sub-regions are similar to the shape and distribution of the outer spiral groove.

[0017] In one embodiment, any region among the second to Nth regions is composed of a plurality of arc-shaped sub-regions, and the shape and distribution of the arc-shaped sub-regions are similar to the shape and distribution of the inner spiral groove.

[0018] In one of the embodiments, any region among the second to Nth regions is composed of a plurality of rectangular sub-regions, and the shape and distribution of the rectangular sub-regions are similar to the shape and distribution of the rectangular grooves.

[0019] In one of the embodiments, any region among the second to Nth regions is composed of a plurality of rectangular sub-regions, and the shape and distribution of the rectangular sub-regions are similar to the shape and distribution of the rectangular grooves.

[0020] In one embodiment, any region among the second to Nth regions is composed of a plurality of circular sub-regions, and the shape and distribution of the circular sub-regions are similar to the shape and distribution of micro-circular grooves.

[0021] The beneficial effects of the present invention are:

[0022] In view of the problem in the prior art that the mechanical sealing performance is affected due to the need to form a fluid film stiffness structure through subtractive manufacturing, the present invention provides a mechanical seal ring with patterned surface properties for liquid medium mechanical seal. Different from the prior art method of using grooves, waviness, taper, gradient and other height-changing patterns to generate fluid film stiffness to improve sealing performance, the sealing end face in the present invention is still a plane area at all places. By surface treating the sealing end face, the sealing medium has different slip properties with the sealing end face when flowing in different areas on the sealing end face, thereby providing fluid film stiffness and avoiding the influence of the subtractive manufacturing method in the prior art on the mechanical sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an easy-slip zone and a hard-slip zone on a sealing end face of a mechanical sealing ring with patterned surface properties according to an embodiment of the present invention, wherein the easy-slip zone is annular;

[0024] Figure 2 for Figure 1 Schematic diagram of the flow field and pressure in the sealing gap of a mechanical seal ring with patterned surface properties;

[0025] Figure 3 This is a schematic structural diagram of an easy-slip zone and a difficult-slip zone on a sealing end face of a mechanical sealing ring with patterned surface properties according to another embodiment of the present invention, wherein the easy-slip zone is arc-shaped;

[0026] Figure 4 for Figure 3 Schematic diagram of the flow field in the sealing gap of a mechanical seal ring with patterned surface properties;

[0027] Figure 5 This is a schematic structural diagram of an easy-slip zone and a difficult-slip zone on a sealing end face of a mechanical sealing ring with patterned surface properties according to another embodiment of the present invention, wherein the easy-slip zone is arc-shaped;

[0028] Figure 6 This is a schematic structural diagram of an easy-slip region and a difficult-slip region on a sealing end face of a mechanical sealing ring with patterned surface properties according to another embodiment of the present invention, wherein the easy-slip region is a rectangle;

[0029] Figure 7 This is a schematic structural diagram of an easy-slip zone and a difficult-slip zone on a sealing end face of a mechanical seal ring with patterned surface properties according to another embodiment of the present invention, wherein the easy-slip zone is a right angle;

[0030] Figure 8 This is a schematic structural diagram of an easy-slip area and a difficult-slip area on a sealing end face of a mechanical sealing ring with patterned surface properties according to another embodiment of the present invention, wherein the easy-slip area is circular.

[0031] in:

[0032] Difficult-to-slip zone 1; easy-to-slip zone 2. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In view of the problem in the prior art that the mechanical sealing performance is affected due to the need to form a fluid film stiffness structure through subtractive manufacturing, the present invention provides a mechanical seal ring with patterned surface properties for liquid medium mechanical seal. Different from the prior art method of using grooves, waviness, taper, gradient and other height-changing patterns to generate fluid film stiffness to improve sealing performance, the sealing end face in the present invention is still a plane area at all places. By surface treating the sealing end face, the sealing medium has different slip properties with the sealing end face when flowing in different areas on the sealing end face, thereby providing fluid film stiffness and avoiding the influence of the subtractive manufacturing method in the prior art on the mechanical sealing performance.

[0037] The mechanical sealing ring with patterned surface properties provided by the present invention includes a dynamic ring and a static ring. The surfaces opposite to each other are sealing end faces. The sealing end faces on the dynamic ring and / or the static ring include a first region and a second region. The first region and / or the second region are surface treated so that the slippage of the sealing medium on the first region is lower than the slippage of the sealing medium on the second region. The surface of the static ring and / or the dynamic ring after treatment is still a plane region. Slippage indicates the difficulty of the liquid sealing medium to slip in the region. The higher the slippage, the easier it is to slip. Figures 1 to 8 As shown, the area with relatively high slip is referred to as the easy-slip zone 1, and the area with relatively low slip is referred to as the difficult-slip zone 2. When the same sealing medium flows through the difficult-slip zone 2 under the same pressure gradient, it is not easy for the sealing medium and the difficult-slip zone 2 to slip, so the flow rate through the difficult-slip zone 2 is low; when flowing through the easy-slip zone 1, it is easy for the sealing medium and the difficult-slip zone 2 to slip, so the flow rate through the difficult-slip zone 2 is high, thus generating a certain fluid film stiffness. When the two mechanical seal end faces are tilted or about to tilt, the fluid film stiffness of the sealing medium can prevent the tilt from occurring, thereby ensuring the sealing performance.

[0038] Since the easy-slip zone 1 and the difficult-slip zone 2 are relative concepts, there are two ways to generate the easy-slip zone 1 and the difficult-slip zone 2: one is to increase the slip property of a certain area, and the other is to reduce the slip property of a certain area. Based on this, there are five ways to generate a difference in slip property between the two areas, taking the first area and the second area as an example, including:

[0039] 1. No treatment is done on the first area, and the slip properties of the second area are improved;

[0040] 2. Reduce the slip of the first area and do not treat the second area;

[0041] 3. Reduce the slip of the first area and increase the slip of the second area;

[0042] 4. reducing the slip properties of the first region and the second region, wherein the slip properties of the first region are reduced more;

[0043] 5. The slip properties of the first region and the second region are improved, wherein the slip properties of the second region are improved more greatly.

[0044] Generally speaking, the production process of the first and second methods is relatively simple and versatile.

[0045] The methods for changing the slip properties of a certain area mainly include surface modification methods such as deposition, electroplating, chemical coating, and mechanochemistry, etc. These processing methods are used to reduce the surface roughness of the easy-slip area 1 or increase the surface roughness of the difficult-slip area 2. Different from the prior art by processing microgrooves, micropores and other structures, the method for changing the surface roughness of the sealing end face in the present invention does not generate force on the sealing end face, will not affect the sealing end face, and is not affected by the mechanical processing performance of the sealing ring material.

[0046] Embodiment 1:

[0047] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 1 As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The sealing end surface is made of silicon carbide material, the sealing medium is water medium, and the second area is subjected to mechanochemical treatment, so that the first area is a difficult-slip area 2 and the second area is an easy-slip area 1; the first area and the second area are both annular areas, and the first area and the second area are concentric, and the maximum diameter of the first area is equal to the minimum diameter of the second area, forming a nested annular structure.

[0048] The flow field and pressure drop characteristics in the sealing gap of the mechanical seal ring with surface patterning in this embodiment are as follows: Figure 2As shown, the left half of the figure is a schematic diagram of the sealing end face structure. The solid line and the dotted line represent different positions of the sealing end face. When it is in the position shown by the solid line, the distance between the two sealing end faces is far, the sealing gap is large, and the film thickness is also large; when it is in the dotted line position, the distance between the two sealing end faces is close, the sealing gap is small, and the film thickness is also small. The right half of the figure is a pressure schematic diagram corresponding to the sealing end face structure of the left half. Under the action of the pressure shown in the figure, the static pressure effect similar to the step end face in the existing mechanical seal can be generated through the difficult-slip zone 2 and the easy-slip zone 1, providing stiffness for the fluid film.

[0049] When N is equal to 3 or above, the multiple regions are all in the shape of circular rings, and the diameters of the first region to the Nth region gradually increase, and the slip properties gradually increase, forming a nested ring structure.

[0050] Embodiment 2:

[0051] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 3 As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is composed of a plurality of discontinuous arc-shaped sheet areas, and a single arc-shaped sheet area is similar in shape to the external spiral groove in the existing mechanical seal, and a static pressure effect similar to the spiral sealing groove in the existing mechanical seal can be generated through the difficult-slip area 2 and the easy-slip area 1. An acute-angle tip is formed on the arc-shaped sheet, and the tip faces the relative flow direction of the sealing medium or the relative rotation direction of another sealing ring. The relative flow direction and relative rotation direction mentioned here, for the static ring, since it remains stationary, the relative flow direction of the sealing medium is the actual flow direction of the sealing medium, and the relative rotation direction of the dynamic ring is the actual rotation direction of the dynamic ring; for the dynamic ring, since the rotation speed of the sealing medium is lower than the rotation speed of the dynamic ring, the relative flow direction of the sealing medium is opposite to the actual flow direction of the sealing medium, and the relative rotation direction of the static ring is opposite to the actual rotation direction of the dynamic ring. Since the inside of the tip is the easy-slip zone 1 and the outside of the tip is the difficult-slip zone 2, when the sealing medium flows to this zone, the movement is blocked, which produces a dynamic pressure effect similar to the spiral sealing groove in the existing mechanical seal. The flow field and pressure drop characteristics in the sealing gap of the mechanical seal ring with surface property patterning in this embodiment are as follows: Figure 4 shown.

[0052] When N is equal to 3 or more, the second region to the Nth region are composed of multiple discontinuous arc-shaped sheet regions, and the shape of a single arc-shaped sheet region is similar to the external spiral groove in the existing mechanical seal. The shapes of the arc-shaped sheets in different regions can be the same or different, but the multiple arc-shaped sheet regions in any region should be evenly distributed around the axis of the mechanical seal ring with patterned surface properties. The slip properties of any two regions from the first region to the Nth region are different.

[0053] Embodiment three:

[0054] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 5 As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is composed of multiple discontinuous arc-shaped sheet areas, and a single arc-shaped sheet area is similar to the shape of the inner spiral groove in the existing mechanical seal. The reverse pumping effect can be achieved through the difficult-slip area 2 and the easy-slip area 1. An acute-angled tip is formed on the arc-shaped sheet, and the tip faces the relative flow direction of the sealing medium or the relative rotation direction of another sealing ring. Since the inside of the tip is the easy-slip area 1, the outside of the tip is the difficult-slip area 2.

[0055] When N is equal to 3 or more, the second region to the Nth region are composed of multiple discontinuous arc-shaped sheet regions, and the shape of a single arc-shaped sheet region is similar to the internal spiral groove in the existing mechanical seal. The shapes of the arc-shaped sheets in different regions can be the same or different, but the multiple arc-shaped sheet regions in any region should be evenly distributed around the axis of the mechanical seal ring with patterned surface properties. The slip properties of any two regions from the first region to the Nth region are different.

[0056] Embodiment 4:

[0057] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 6 As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is composed of a plurality of discontinuous rectangular sub-areas, and the length direction of the rectangular sub-areas coincides with the radial direction of the mechanical seal ring with patterned surface properties, and a static pressure effect similar to that of a rectangular groove in an existing mechanical seal can be generated through the difficult-slip area 2 and the easy-slip area 1. Since the two sides of one of the long sides of the rectangular sub-area are the easy-slip area 1 and the difficult-slip area 2 respectively, when the sealing medium flows from the easy-slip area 1 to the difficult-slip area 2, it is hindered, generating a dynamic pressure effect similar to that of a spiral seal groove in an existing mechanical seal.

[0058] When N is equal to 3 or more, the second region to the Nth region are composed of multiple discontinuous rectangular sub-regions, and the shape of a single rectangular sub-region is similar to the rectangular groove in the existing mechanical seal. The sizes of rectangles in different regions can be the same or different, but the multiple rectangular sub-regions in any region should be evenly distributed around the axis of the mechanical seal ring with surface property patterning. The slip properties of any two regions from the first region to the Nth region are different.

[0059] Embodiment five:

[0060] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 7 As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is composed of a plurality of discontinuous right-angled sub-areas, and the right-angled sub-areas include a first part and a second part that are perpendicular to each other, and the center line of the first part coincides with the radial direction of the mechanical sealing ring with patterned surface properties, and the second part extends from the end of the first part along the relative flow direction of the sealing medium or the relative rotation direction of another sealing ring, and a static pressure effect similar to that of a rectangular groove in an existing mechanical seal can be generated through the difficult-slip area 2 and the easy-slip area 1. The end of the second part away from the first part has an easy-slip area 1 inside and a difficult-slip area 2 outside. When the sealing medium flows from the easy-slip area 1 to the difficult-slip area 2, it is hindered, generating a dynamic pressure effect similar to that of a right-angled groove in an existing mechanical seal.

[0061] When N is equal to 3 or more, the second region to the Nth region are composed of multiple discontinuous right-angled sub-regions, and the shape of a single right-angled sub-region is similar to the right-angled groove in the existing mechanical seal. The right-angle sizes between different regions can be the same or different, but the multiple right-angled sub-regions in any region should be evenly distributed around the axis of the mechanical seal ring with patterned surface properties. The slip properties of any two regions from the first region to the Nth region are different.

[0062] Embodiment six:

[0063] The mechanical seal ring with patterned surface properties provided in this embodiment includes a first area and a second area on the sealing end face when N is equal to 2. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is a plurality of discontinuous circular sub-areas, and the distribution of the circular sub-areas in the circumferential direction does not follow a fixed rule, but the distances between the plurality of circular sub-areas should be roughly equal. The inside of the circular sub-area is an easy-slip area 1, and the outside is a difficult-slip area 2. When the sealing medium flows from the easy-slip area 1 to the difficult-slip area 2, it is hindered, generating a dynamic pressure effect similar to that of the micro-circular groove in the existing mechanical seal.

[0064] When N is equal to 3 or more, the second region to the Nth region are composed of multiple discontinuous circular sub-regions, and the shape of a single circular sub-region is similar to the micro-circular groove in the existing mechanical seal. The circular sizes between different regions can be the same or different. The multiple circular sub-regions in any region are not distributed according to a fixed rule, but the distances between the multiple circular sub-regions in the same region should be roughly equal. The slip properties of any two regions from the first region to the Nth region are different.

[0065] Embodiment seven:

[0066] The mechanical seal ring with patterned surface properties provided in this embodiment, such as Figure 8As shown, when N is equal to 2, the sealing end surface includes a first area and a second area. The first area is a difficult-slip area 2, and the second area is an easy-slip area 1; the second area is a plurality of discontinuous circular sub-areas, and the circular sub-areas are evenly distributed along the circumference of the mechanical seal ring with a surface property pattern; or a plurality of circular sub-areas combined as a whole, and evenly distributed along the circumference of the mechanical seal ring with a surface property pattern. The inside of the circular sub-area is an easy-slip area 1, and the outside is a difficult-slip area 2. When the sealing medium flows from the easy-slip area 1 to the difficult-slip area 2, it is hindered, generating a dynamic pressure effect similar to that of the micro-circular groove in the existing mechanical seal.

[0067] Compared with the prior art, the present invention has at least the following advantages:

[0068] 1. The surface treatment accuracy is relatively easy to control, and the sealing performance of the mechanical sealing ring with patterned surface properties can be maintained;

[0069] 2. The surface treatment will not be affected by the mechanical processing performance of the mechanical seal ring material with patterned surface properties;

[0070] 3. Surface treatment does not remove material and will not cause deformation or tilt of the sealing end face.

[0071] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A mechanical sealing ring with patterned surface properties, comprising a dynamic ring and a static ring, wherein the surfaces opposite to each other are sealing end faces, characterized in that: The sealing end surface on the dynamic ring and / or the static ring includes a total of N regions from the first region to the Nth region, N is a natural number not less than 3, the first region to the Nth region are all plane regions, and the slippage of the sealing medium on the first region to the Nth region gradually increases; wherein, The first region to the Nth region are all in the shape of a circular ring, and the diameters of the first region to the Nth region gradually increase to form a nested ring structure; or, The first region is a continuous region, the second region to the Nth region each include a plurality of discontinuous regions, the first region to the Nth region as a whole constitute an annular structure, and any region among the second region to the Nth region is uniformly distributed along the circumference of the sealing end surface.

2. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: When the first region to the Nth region are all in the shape of a circular ring, the diameters of the first region to the Nth region gradually increase.

3. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: In the case where the second region to the Nth region all include multiple non-continuous regions, any region among the second region to the Nth region is composed of multiple arc-shaped sub-regions, and the shape and distribution of the arc-shaped sub-regions are similar to the shape and distribution of the outer spiral groove.

4. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: In the case where the second region to the Nth region all include multiple non-continuous regions, any region among the second region to the Nth region is composed of multiple arc-shaped sub-regions, and the shape and distribution of the arc-shaped sub-regions are similar to the shape and distribution of the inner spiral groove.

5. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: In the case where the second region to the Nth region each include a plurality of discontinuous regions, any region among the second region to the Nth region is composed of a plurality of rectangular sub-regions, and the shape and distribution of the rectangular sub-regions are similar to the shape and distribution of the rectangular grooves.

6. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: In the case where the second region to the Nth region all include multiple non-continuous regions, any region among the second region to the Nth region is composed of multiple rectangular sub-regions, and the shape and distribution of the rectangular sub-regions are similar to the shape and distribution of the rectangular grooves.

7. The mechanical seal ring with patterned surface properties according to claim 1, characterized in that: In the case where the second region to the Nth region all include multiple non-continuous regions, any region among the second region to the Nth region is composed of multiple circular sub-regions, and the shape and distribution of the circular sub-regions are similar to the shape and distribution of micro-circular grooves.

8. The mechanical seal ring with a patterned surface property according to any one of claims 1 to 7, characterized in that: The surface modification method for changing the slip property of any region from the first region to the Nth region includes deposition, electroplating, chemical coating, and mechanochemistry.

Images