End face micro-texture structure and kinematic pair of mechanical bearing device

Abstract

The invention provides an end face micro-texture structure which is used for end faces matched with each other of a kinematic pair and comprises a plurality of fluid dynamic pressure units distributed at intervals in the relative movement direction of the kinematic pair, and each fluid dynamic pressure unit comprises a concave drainage groove and Tesla one-way valve runner groove structures arranged on the two sides of the drainage groove. The extending direction of the drainage groove is perpendicular to the relative movement direction of the end face of the kinematic pair, the runner contour shapes of the runner groove structures of the Tesla one-way valve on the two sides of the drainage groove are symmetrical about the central axis of the drainage groove, and through the design, no matter the kinematic pair moves forwards or reversely, it can be guaranteed that fluid meets the condition for generating the fluid dynamic pressure effect; it is guaranteed that the kinematic pair generates a good supporting or sealing effect through fluid, and the problem that an existing kinematic pair can only provide a single-side supporting or sealing effect is solved. The invention further provides a kinematic pair of the mechanical bearing device.

Description

Technical Field

[0001] The present invention relates to the field of fluid and micro-woven technology, in particular to an end surface micro-woven structure, and also to a kinematic pair of a mechanical bearing device. Background Art

[0002] At present, equipment such as gas-lubricated thrust bearings, sliding bearings, mechanical seals, dry gas seals, etc. usually have a kinematic pair formed by one static and one dynamic. The basic principle is to open a micrometer-sized fluid lubrication groove with a specially designed shape on one surface of the kinematic pair. The groove can shear the medium when the kinematic pair moves relative to each other, forming a fluid dynamic pressure effect, thereby generating a lifting force, so that the micrometer-sized gap is always maintained between the kinematic pairs, thereby achieving functions such as reducing friction, taking away heat, providing bearing capacity, and providing controllable leakage. This type of fluid dynamic pressure groove is usually divided into single-handed and double-handed. Single-handed grooves include Archimedean spiral grooves, and double-handed grooves include T-shaped grooves and Christmas tree grooves. However, in the past, the unidirectional groove type was generally considered in the same industry to be able to produce the greatest fluid dynamic pressure effect, while the fluid dynamic pressure effect produced by the bidirectional groove was relatively weak. However, in actual use, bearings and sealing equipment often have working requirements for bidirectional motion. Therefore, the current design of setting the fluid dynamic pressure groove structure on the surface of the moving side end face is often difficult to meet the actual working requirements of bearings, sealing components, etc., and the load-bearing, lubrication and controllable leakage effects achieved are often compromised.

[0003] In summary, the existing bearings and sealing devices using fluid dynamic pressure groove surface design have the technical problem of poor effect during bidirectional motion. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing bearings and sealing devices using fluid dynamic pressure groove surface design have poor effects when in bidirectional motion. In order to solve the above problem, the present invention provides an end surface micro-texture structure, which is used for the end surface of the kinematic pair to cooperate with each other, including a plurality of fluid dynamic pressure units spaced and distributed along the relative motion direction of the kinematic pair, each of the fluid dynamic pressure units includes a concave drainage groove and a Tesla one-way valve flow channel groove structure arranged on both sides of the drainage groove, the extension direction of the drainage groove is perpendicular to the relative motion direction of the end surface of the kinematic pair, one end of the drainage groove extends to the edge of the end surface, and the flow channel contour shape of the Tesla one-way valve flow channel groove structure located on both sides of the drainage groove is symmetrical about the central axis of the drainage groove.

[0005] The end surface micro-textured structure provided by the present invention is used to be arranged on the end surface of the moving pair of equipment such as thrust bearings, sliding bearings, mechanical seals, and dry gas seals. The principle is that the fluid movement driven by the relative movement of the moving pair forms a fluid dynamic pressure effect, thereby generating a lifting force, so that the micron-level gap is always maintained between the moving pairs, thereby achieving the functions of reducing friction, taking away heat, providing bearing capacity, and providing controllable leakage; specifically, a plurality of array-arranged fluid dynamic pressure units are arranged on the end surface, and the fluid dynamic pressure units are all axially symmetrical in structure, and a drainage groove is arranged at the central axis position, and the end of the drainage groove extends to the edge of the end surface, which is used to communicate with the fluid space on the side of the structure to introduce the fluid into the end surface, and the Tesla one-way valve flow channel groove structure is symmetrically distributed on both sides of the drainage groove. The Tesla one-way valve flow channel groove structure has a Tesla one-way The valve structure features that when high-speed fluid flows from the drainage groove to the Tesla one-way valve flow channel groove structures on both sides, the turbulence generated inside the flow channel blocks the flow of the fluid, thereby satisfying the conditions for generating a fluid dynamic pressure effect. Furthermore, since the flow channel structure shapes of the Tesla one-way valve flow channel groove structures on both sides of the drainage groove are symmetrical about the drainage groove axis, that is, when the fluid flows through the Tesla one-way valve flow channel groove structure on the end face of the moving pair in a direction perpendicular to the extension direction of the drainage groove, whether it passes through in the forward or reverse direction, corresponding to the forward or reverse relative motion of the moving pair, it can ensure that the fluid satisfies the conditions for generating a fluid dynamic pressure effect, and ensure that the moving pair utilizes the fluid to generate a good support or sealing effect, effectively solving the technical problem that the existing bearings and sealing equipment with a fluid dynamic pressure groove surface design have poor effects during bidirectional motion.

[0006] As a preferred solution, three or more groups of Tesla one-way valve flow channel groove structures are evenly distributed at preset intervals on both sides of the drainage groove along the extension direction of the drainage groove. The principle of this design is similar to the above design. By adding Tesla one-way valve flow channel groove structures arranged in sequence along the axial direction of the drainage groove, the fluid dynamic pressure effect is enhanced to improve the support or sealing effect of the kinematic pair.

[0007] As a preferred solution, the Tesla one-way valve flow channel groove structure includes a main flow channel connected to the drainage groove, and a plurality of branch flow channels connected to the main flow channel are arranged at preset intervals on the side of the main flow channel, and the branch flow channel includes an arc portion and a straight portion, and the proximal ends of the arc portion and the straight portion are connected to each other, and the distal ends of the arc portion and the straight portion are respectively connected to the main flow channel, and a preset angle is formed between the straight portion and the main flow channel. This design optimizes the specific structure of the Tesla one-way valve flow channel groove structure, and the process of the fluid dynamic pressure effect through the Tesla one-way valve flow channel is that the high-speed fluid enters the main flow channel from the drainage groove, and when the fluid passes along the direction from the arc flow channel of the branch flow channel to the straight flow channel, the turbulence generated when the branch flow channel flows back to the main flow channel blocks the flow of the fluid, thereby satisfying the conditions for generating the fluid dynamic pressure effect.

[0008] As a preferred solution, a fluid dynamic pressure groove structure is provided between adjacent fluid dynamic pressure units, one end of the fluid dynamic pressure groove structure in the long axis direction extends to the edge of the end surface, and both sides of the fluid dynamic pressure groove structure are respectively connected to the Tesla one-way valve flow channel groove structure of the adjacent fluid dynamic pressure unit, and the contour shapes of the Tesla one-way valve flow channel groove structures on both sides are symmetrical about the central axis of the fluid dynamic pressure groove structure.

[0009] This design further improves the adaptability between the end face micro-texture structure and the kinematic pair structure. A fluid dynamic pressure groove structure is provided between adjacent fluid dynamic pressure units. The fluid dynamic pressure groove preferably has a larger groove depth than the groove structure of the fluid dynamic pressure unit. The fluid flux is increased through such an additional groove structure, thereby not only meeting the support and sealing function requirements of the end face, but also strengthening the basic lubrication function required by the end face, so that the fluid medium can be better connected with the lubrication passages at other positions of the kinematic pair.

[0010] As a preferred solution, the groove depth of the fluid dynamic pressure groove structure on the end face is 1.5 to 2.5 times the groove depth of the fluid dynamic pressure unit. This design specifically optimizes the ratio of the groove depth of the fluid dynamic pressure groove structure to the groove depth of the fluid dynamic pressure unit, and the numerical ratio range of the groove depth of the two is preferably 1.5 to 2.5 times. Such a groove depth design can further optimize the above-mentioned premise of ensuring the support and sealing effect of the end face of the kinematic pair, and increase the flow rate of the fluid medium on the end face of the kinematic pair to meet the overall working requirements of the kinematic pair.

[0011] As a preferred solution, the ratio of the length of the fluid dynamic pressure groove structure in the relative motion direction of the kinematic pair to the length of the fluid dynamic pressure unit is in the range of 1:1-1.5:1. This design is aimed at the end surface design of the fluid dynamic pressure unit and the fluid dynamic pressure groove with interval distribution. The use of this length coverage ratio can take into account the optimization of the support and lubrication effects of the kinematic pair.

[0012] As a preferred solution, the fluid dynamic pressure groove structure is T-shaped, and the end of the groove structure where the central axis of the fluid dynamic pressure groove structure is located extends to the edge of the end surface, and the ends of the groove structure on both sides of the fluid dynamic pressure groove structure are respectively connected to the Tesla one-way valve flow channel groove structure of the adjacent fluid dynamic pressure unit.

[0013] The design provides a preferred fluid dynamic pressure groove structure, which is T-shaped as a whole. The end of the middle groove body reaches the edge of the end face. The groove bodies on both sides are connected to the other end of the middle groove body, and are connected to the adjacent Tesla one-way valve flow channel groove structure at the other end. The fluid flow performance of this structure is good and is suitable for the above-mentioned groove body design requirements.

[0014] As a preferred solution, the lengths of each section and the total length of the drainage groove and the Tesla one-way valve flow channel groove structure of the fluid dynamic pressure unit are greater than 1 mm, and the groove depth values ​​of the drainage groove and the Tesla one-way valve flow channel groove structure on the end surface range from 0.1 μm to 100 μm.

[0015] The design optimizes the dimensions of the drainage groove and the Tesla one-way valve flow channel groove structure of the fluid dynamic pressure unit, wherein the length and width of the drainage groove and the Tesla one-way valve flow channel groove structure in the plane of the moving pair end face are both in the millimeter order, and the length of each groove section is greater than 1 mm, and the dimension of the drainage groove and the Tesla one-way valve flow channel groove structure in the thickness direction of the end face, i.e., the groove depth is in the micron order, and the preferred groove depth dimension range is 0.1μm-100μm. The dimension optimization of the groove shape in the two-dimensional plane of the end face can firstly ensure that the groove body size is large enough to ensure that the turbulence formed by the fluid can provide sufficient supporting force, and secondly, the groove depth in the thickness direction is in the micron order, so as to avoid excessive groove depth on the end face, which increases the roughness of the end face and increases the friction of the end face, thereby affecting the normal working performance of the moving pair.

[0016] As a preferred solution, the width of the drainage groove is in the range of 0.5mm-50mm, including the end value, and the width of the main channel and the branch channel is in the range of 0.1mm-2mm, including the end value. This design is a further optimization based on the above-mentioned groove structure size, providing a preferred size range for the groove width of the drainage groove, the main channel and the branch channel. Within this groove width value range, the flow rate of the fluid medium can be guaranteed to meet the conditions for forming a fluid dynamic pressure effect, and the processing difficulty of the groove structure on the end face can be reduced by limiting the groove width size, thereby reducing the actual cost of the equipment.

[0017] The present invention also provides a kinematic pair of a mechanical bearing device, comprising a kinematic pair mating component with end faces abutting against each other, the kinematic pair mating component is in annular shape or flat plate shape, the end face of the kinematic pair mating component is provided with an end face micro-texture structure as described in any one of the above items, when the kinematic pair mating components are all in annular shape, the fluid dynamic pressure units are distributed in a circular array; when the kinematic pair mating component is in a flat plate shape, the fluid dynamic pressure units are distributed in a linear array. Since the above end face micro-texture structure has the above various beneficial effects, the kinematic pair of a mechanical bearing device having the end face micro-texture structure should also have corresponding beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the local structure of a single fluid dynamic pressure unit in an end surface micro-texture structure provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the local structure of the micro-texture on the mid-end surface; Figure 3 A schematic diagram of the end surface structure of a kinematic pair of a mechanical bearing device provided by the present invention; Figure 4 This is a schematic diagram of the principle of Tesla's one-way valve.

[0019] in, Figure 1-Figure 3 middle: 1. Drainage groove; 2. Tesla one-way valve flow channel groove structure; 2-1. Main channel; 2-2. Branch channel; 2-2-1. Arc part; 2-2-2. Straight part; 3. Fluid dynamic pressure groove structure; 4. Kinematic pair matching components. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Before the working principle of the present invention is described in detail, the description of the present invention needs to be further explained: In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welding connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] refer to Figure 1-Figure 4 The following embodiments are described, Figure 1 A schematic diagram of the local structure of a single fluid dynamic pressure unit in an end surface micro-texture structure provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the local structure of the micro-texture on the mid-end surface; Figure 3 A schematic diagram of the end surface structure of a kinematic pair of a mechanical bearing device provided by the present invention; Figure 4 This is a schematic diagram of the principle of Tesla's one-way valve.

[0023] An embodiment of the present invention provides an end surface micro-texture structure, comprising a plurality of fluid dynamic pressure units arranged in a regular array, each fluid dynamic pressure unit comprising a concave drainage groove 1 and a Tesla one-way valve flow channel groove structure 2 symmetrically arranged on both sides of the drainage groove 1, the extension direction of the drainage groove 1 is perpendicular to the relative movement direction of the end surface, one end of the drainage groove 1 extends to the edge of the end surface, the Tesla one-way valve flow channel groove structure 2 comprises a main flow channel 2-1 connected to the drainage groove 1, and a plurality of branch channels connected to the main flow channel 2-1 are arranged at a preset distance on the side of the main flow channel 2-1 The flow channel 2-2, the branch flow channel 2-2 includes an arc portion 2-2-1 and a straight portion 2-2-2, the proximal ends of the arc portion 2-2-1 and the straight portion 2-2-2 are connected to each other, the distal ends of the arc portion 2-2-1 and the straight portion 2-2-2 are connected to the main flow channel 2-1 respectively, and the straight portion 2-2-2 and the main flow channel 2-1 form a preset angle less than 45°; the flow channel contour shapes of the main flow channel 2-1 and the branch flow channel 2-2 of the Tesla one-way valve flow channel groove structure 2 located on both sides of the drainage groove 1 are symmetrical about the central axis of the drainage groove 1.

[0024] The present invention uses the Tesla valve shape characteristics to achieve at the micro-nano scale, and utilizes the Tesla check valve's one-way passage characteristics. Figure 4 As shown in the figure, when the high-speed fluid flows from right to left, due to the special structure, turbulence will not be generated at the Tesla valve section to block the fluid. However, when the high-speed fluid flows from left to right, the fluid will generate turbulence at the Tesla valve section to block the fluid, thereby achieving the one-way passage capability of the entire flow channel.

[0025] The end surface micro-textured structure provided by the present invention is used to be set on the end surface of the moving pair of equipment such as thrust bearings, sliding bearings, mechanical seals, and dry gas seals. The principle is that the fluid movement driven by the relative movement of the moving pair forms a fluid dynamic pressure effect, thereby generating a lifting force, so that the micron-level gap is always maintained between the moving pairs, thereby achieving the functions of reducing friction, taking away heat, providing bearing capacity, and providing controllable leakage; specifically, a plurality of array-arranged fluid dynamic pressure units are set on the end surface, and the fluid dynamic pressure units are all axially symmetrical structures, and a drainage groove 1 is set at the central axis position. The end of the drainage groove 1 extends to the edge of the end surface, which is used to communicate with the fluid space on the side of the structure to introduce the fluid into the end surface, and the Tesla one-way valve flow channel groove structure 2 is symmetrically distributed on both sides of the drainage groove 1. The molding method of the drainage groove 1 and the Tesla one-way valve flow channel groove structure 2 on the end surface includes but is not limited to photolithography, laser or chemical etching.

[0026] The Tesla one-way valve flow channel groove structure 2 has the structural characteristics of a Tesla valve. When a high-speed fluid passes along the direction from the arc flow channel of the branch flow channel 2-2 to the straight flow channel, the turbulence generated when the branch flow channel 2-2 flows back to the main flow channel 2-1 blocks the flow of the fluid, thereby satisfying the conditions for generating a fluid dynamic pressure effect. Furthermore, since the flow channel structure shapes of the Tesla one-way valve flow channel groove structure 2 on both sides of the drainage groove 1 are symmetrical about the drainage groove 1 axis, that is, when the fluid flows through the Tesla one-way valve flow channel groove structure 2 on the moving side end surface in a direction perpendicular to the movement direction of the drainage groove 1, regardless of Whether passing through in the forward or reverse direction, corresponding to the forward or reverse relative movement of the kinematic pair, the fluid can form a fluid flow area in the Tesla one-way valve flow channel groove structure 2 area on one side of the drainage groove 1, and form a fluid blocking area on the other side of the drainage groove 1. It can be seen that no matter how the relative movement of the end face of the kinematic pair is in the reverse direction, the fluid can be guaranteed to meet the conditions for generating a fluid dynamic pressure effect at the end face, ensuring that the kinematic pair utilizes the fluid to produce a good support or sealing effect, effectively solving the technical problem that the existing bearings and sealing equipment with a fluid dynamic pressure groove surface design have poor effects when moving in both directions.

[0027] In the technical solution provided in this embodiment, a branch channel 2-2 is provided on both sides of each main channel 2-1, and the inclination angles of the straight portion 2-2-2 and the arc portion 2-2-1 of each branch channel 2-2 on both sides of the main channel are symmetrical about the main channel 2-1. This design optimizes the structure of each Tesla one-way valve channel groove structure 2, and multiple components of channels 2-2 are provided on both sides of the main channel 2-1, and the structure ensures that the inclination angles of the straight portion 2-2-2 and the arc portion 2-2-1 of each branch channel 2-2 on both sides of the main channel 2-1 are symmetrical about the main channel 2-1, so as to ensure that the fluid movement direction of the fluid turbulence generated by the branch channels 2-2 on both sides is the same. Through such a design, the position where the Tesla one-way valve channel groove structure 2 on each side can generate turbulence is increased, which is equivalent to enhancing the fluid dynamic pressure effect and improving the support or sealing effect of the kinematic pair.

[0028] In the technical solution provided in this embodiment, the length of each branch channel 2-2 on both sides of the main channel 2-1 of the same Tesla one-way valve flow channel groove structure 2 is equal to the spacing between adjacent branch channels 2-2, and the divergence point between any branch channel 2-2 and the main channel 2-1 coincides with the confluence point between the adjacent branch channel 2-2 on the other side and the main channel 2-1. This design further optimizes the specific structure of each Tesla one-way valve flow channel groove structure 2. On the basis of the structure that both sides of the main channel 2-1 are provided with connected branch channels 2-2, the flow channel shape and flow channel length of each branch channel 2-2 are equal, and the branch channels 2-2 located at adjacent positions on both sides of the main channel 2-1 coincide with the positions where the main channel 2-1 diverges or converges. According to fluid mechanics analysis, adopting such a flow channel design can enhance the intensity of turbulence generated at the confluence position of the branch channel 2-2 and the main channel 2-1. Enhancing the intensity of turbulence is equivalent to enhancing the intensity of the fluid dynamic pressure effect, and can also enhance the support or sealing effect of the fluid on the moving pair.

[0029] In the technical solution provided in this embodiment, three or more groups of Tesla one-way valve flow channel groove structures 2 are evenly distributed at preset intervals on both sides of the drainage groove 1 along the extension direction of the drainage groove 1. The principle of this design is similar to that of the above-mentioned design. By adding Tesla one-way valve flow channel groove structures 2 arranged in sequence along the axial direction of the drainage groove 1, the fluid dynamic pressure effect is enhanced to improve the support or sealing effect of the kinematic pair.

[0030] In the technical solution provided in this embodiment, a fluid dynamic pressure groove structure 3 is arranged between adjacent fluid dynamic pressure units, one end of the fluid dynamic pressure groove structure 3 in the long axis direction extends to the edge of the end face, and the two sides of the fluid dynamic pressure groove structure 3 are respectively connected with the Tesla one-way valve flow channel groove structure 2 of the adjacent fluid dynamic pressure unit, and the contour shapes of the branch channels 2-2 of the Tesla one-way valve flow channel groove structures 2 on both sides are symmetrical about the central axis of the fluid dynamic pressure groove structure 3.

[0031] This design further improves the adaptability between the end face micro-texture structure and the kinematic pair structure. A fluid dynamic pressure groove structure 3 is provided between adjacent fluid dynamic pressure units. The fluid dynamic pressure groove preferably has a larger groove depth than the groove structure of the fluid dynamic pressure unit. The fluid flux is increased through such an additional groove structure, thereby not only meeting the support and sealing function requirements of the end face, but also strengthening the basic lubrication function required by the end face, so that the fluid medium can be better connected with the lubrication passages at other positions of the kinematic pair.

[0032] In the technical solution provided in this embodiment, the groove depth of the fluid dynamic pressure groove structure 3 on the end face is 1.5 times to 2.5 times the groove depth of the fluid dynamic pressure unit. The design specifically optimizes the ratio of the groove depth of the fluid dynamic pressure groove structure 3 to the groove depth of the fluid dynamic pressure unit. The numerical ratio range of the groove depth of the two is preferably 1.5 times to 2.5 times, and the most preferred is 2 times. Such a groove depth design can further optimize the above-mentioned premise of ensuring the support and sealing effect of the end face of the kinematic pair, and increase the flow rate of the fluid medium on the end face of the kinematic pair to meet the overall working requirements of the kinematic pair. At the same time, the ratio range of the length of the fluid dynamic pressure groove structure in the relative motion direction of the kinematic pair to the length of the fluid dynamic pressure unit is 1:1-1.5:1, where the length of the fluid dynamic pressure unit refers to the length of the fluid dynamic pressure unit in the relative motion direction of the kinematic pair. The design is aimed at the end face design where the fluid dynamic pressure unit and the fluid dynamic pressure groove are spaced apart. The use of this length coverage range ratio can take into account the optimization of the support and lubrication effects of the kinematic pair.

[0033] In the technical solution provided in this embodiment, the fluid dynamic pressure groove structure 3 is T-shaped, and the end of the groove structure where the central axis of the fluid dynamic pressure groove structure 3 is located extends to the edge of the end face, and the ends of the groove structure on both sides of the fluid dynamic pressure groove structure 3 are respectively connected to the Tesla one-way valve flow channel groove structure 2 of the adjacent fluid dynamic pressure unit.

[0034] The design provides a preferred fluid dynamic pressure groove structure 3, which is T-shaped as a whole. The end of the middle groove body reaches the edge of the end face. The groove bodies on both sides are connected to the other end of the middle groove body, and are connected to the adjacent Tesla one-way valve flow channel groove structure 2 at the other end. The fluid passing performance of this structure is good and is suitable for the above-mentioned groove body design requirements.

[0035] The fluid dynamic pressure groove structure 3 in this embodiment is preferably a T-groove, and may also be a bidirectional fluid dynamic pressure groove of other known technologies or other inventions. When this type of groove moves linearly to one side of the kinematic pair where the end face is located or rotates in a certain direction, a positive fluid dynamic pressure will be formed in the area where the Tesla one-way valve flow channel groove structure 2 is located on one side of the T-groove, and a negative fluid dynamic pressure will be formed in the area where the Tesla one-way valve flow channel groove structure 2 is located on the other side of the T-groove. After the positive and negative pressures are offset, the total fluid dynamic pressure value is extremely low.

[0036] Due to the bilateral symmetry and one-open-one-closed characteristics of the micro-texture unit, the fluid (liquid or gas) added to the drainage groove 1 area can smoothly pass through the Tesla one-way valve channel groove structure 2 on one side of the drainage groove 1 to eliminate the negative pressure area on one side of the T-slot, while the high-pressure fluid medium on the other side of the T-slot cannot enter the area on the other side of the T-slot due to the blocking area formed by the Tesla channel characteristics, thereby achieving the fluid blocking function between the positive pressure area and the Tesla channel micro-texture area and the function of adding medium to the negative pressure area to reduce the negative pressure. As a result, the negative pressure area of ​​the two-way groove friction pair with the Tesla channel micro-texture characteristics is completely eliminated, and the positive pressure area is retained.

[0037] In the technical solution provided in this embodiment, the lengths of each section and the total length of the drainage groove 1 of the fluid dynamic pressure unit and the Tesla one-way valve flow channel groove structure 2 are both greater than 1 mm, and the groove depth values ​​of the drainage groove 1 and the Tesla one-way valve flow channel groove structure 2 on the end surface range from 0.1 μm to 100 μm.

[0038] The design optimizes the dimensions of the drainage groove 1 and the Tesla one-way valve flow channel groove structure 2 of the fluid dynamic pressure unit, wherein the length and width of the drainage groove 1 and the Tesla one-way valve flow channel groove structure 2 in the plane of the moving pair end face are both in the millimeter order, and the length of each groove section including the main channel 2-1, the branch channel 2-1, the straight portion 2-2-2 of the branch channel 2-1 and the arc portion 2-2-1 are all greater than 1 mm, and the dimension of the drainage groove 1 and the Tesla one-way valve flow channel groove structure 2 in the thickness direction of the end face, that is, the groove depth is in the micron order, and the preferred groove depth size range is 0.1μm-100μm. The size optimization of the groove shape in the two-dimensional plane of the end face can firstly ensure that the groove body size is large enough to ensure that the turbulence formed by the fluid can provide sufficient supporting force, and secondly, the groove depth in the thickness direction is in the micron order, which avoids the excessive groove depth on the end face increasing the roughness of the end face and increasing the friction of the end face, thereby affecting the normal working performance of the moving pair.

[0039] In the technical solution provided in this embodiment, the width of the drainage groove 1 ranges from 0.5mm to 50mm, including the end value, and the width of the main channel 2-1 and the branch channel 2-2 ranges from 0.1mm to 2mm, including the end value. This design is a further optimization based on the above-mentioned groove structure dimensions, providing a preferred size range for the width of the drainage groove 1, the main channel 2-1 and the branch channel 2-2, within which the flow rate of the fluid medium can be guaranteed to meet the conditions for forming a fluid dynamic pressure effect, and the processing difficulty of the groove structure on the end face can be reduced by limiting the groove width dimension, thereby reducing the actual cost of the equipment.

[0040] This embodiment also provides a kinematic pair of a mechanical bearing device, including a kinematic pair matching component 4 whose end faces abut each other, the kinematic pair matching component including a commonly used annular shape and a plane shape, the end face of the kinematic pair matching component 4 is provided with an end face micro-texture structure as described in any of the above embodiments, and one of the two end faces that match each other is provided with the above end face micro-texture structure, when the kinematic pair matching component is in annular shape, that is, a rotary bearing component, the fluid dynamic pressure unit is distributed in an annular array, and the distribution mode can be a single ring or a radially spaced multi-ring, and in the case of a multi-ring array, the drainage grooves 1 of the fluid dynamic pressure units located at the same circumferential position of adjacent rings are connected to each other. When the kinematic pair matching component 4 is in a flat plate shape or a similar guide rail structure, that is, when the two components play a supporting and lubricating effect by means of translational sliding, the fluid dynamic pressure units are distributed in a linear array, and can also adapt to the actual component surface conditions, and the array is in the shape of multiple straight lines parallel to each other. Since the above-mentioned end face micro-texture structure has the above-mentioned various beneficial effects, the kinematic pair of the mechanical bearing device having the end face micro-texture structure should also have corresponding beneficial effects.

[0041] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An end surface micro-woven structure, characterized in that: The end surface used for the kinematic pair to cooperate with each other comprises a plurality of fluid dynamic pressure units spaced apart along the relative motion direction of the kinematic pair, each of the fluid dynamic pressure units comprising a concave drainage groove (1) and a Tesla one-way valve flow channel groove structure (2) arranged on both sides of the drainage groove (1), the extension direction of the drainage groove (1) being perpendicular to the relative motion direction of the end surface of the kinematic pair, one end of the drainage groove (1) extending to the edge of the end surface, and the flow channel contour shape of the Tesla one-way valve flow channel groove structure (2) located on both sides of the drainage groove (1) being symmetrical about the central axis of the drainage groove (1).

2. The end surface micro-woven structure according to claim 1, characterized in that: On both sides of the drainage groove (1), more than three groups of Tesla one-way valve flow channel groove structures (2) are evenly distributed at preset intervals along the extension direction of the drainage groove (1).

3. The end surface micro-woven structure according to claim 1, characterized in that: The Tesla one-way valve flow channel groove structure (2) comprises a main flow channel (2-1) connected to the drainage groove (1); a plurality of branch flow channels (2-2) connected to the main flow channel (2-1) are arranged at a preset distance on the side of the main flow channel (2-1); the branch flow channel (2-2) comprises an arc portion (2-2-1) and a straight portion (2-2-2); the proximal ends of the arc portion (2-2-1) and the straight portion (2-2-2) are connected to each other; the distal ends of the arc portion (2-2-1) and the straight portion (2-2-2) are respectively connected to the main flow channel (2-1); and a preset angle is formed between the straight portion (2-2-2) and the main flow channel (2-1).

4. The end surface micro-woven structure according to any one of claims 1 to 3, characterized in that: A fluid dynamic pressure groove structure (3) is provided between adjacent fluid dynamic pressure units, one end of the fluid dynamic pressure groove structure (3) in the long axis direction extends to the edge of the end face, and both sides of the fluid dynamic pressure groove structure (3) are respectively connected to the Tesla one-way valve flow channel groove structure (2) of the adjacent fluid dynamic pressure unit, and the contour shapes of the Tesla one-way valve flow channel groove structures (2) on both sides are symmetrical about the central axis of the fluid dynamic pressure groove structure (3).

5. The end surface micro-woven structure according to claim 4, characterized in that: The groove depth of the fluid dynamic pressure groove structure (3) on the end surface is 1.5 to 2.5 times the groove depth of the fluid dynamic pressure unit.

6. The end surface micro-woven structure according to claim 5, characterized in that: The ratio of the length of the fluid dynamic pressure groove structure (3) in the relative motion direction of the kinematic pair to the length of the fluid dynamic pressure unit is in the range of 1:1-1.5:

1.

7. The end surface micro-woven structure according to claim 5, characterized in that: The fluid dynamic pressure groove structure (3) is T-shaped, and the end of the groove structure where the center axis of the fluid dynamic pressure groove structure (3) is located extends to the edge of the end surface, and the ends of the groove structure on both sides of the fluid dynamic pressure groove structure (3) are respectively connected to the Tesla one-way valve flow channel groove structure (2) of the adjacent fluid dynamic pressure unit.

8. The end surface micro-woven structure according to claim 3, characterized in that: The length of each section and the total length of the drainage groove (1) and the Tesla one-way valve flow channel groove structure (2) of the fluid dynamic pressure unit are both greater than 1 mm, and the groove depth of the drainage groove (1) and the Tesla one-way valve flow channel groove structure (2) on the end surface ranges from 0.1 μm to 100 μm.

9. The end surface micro-woven structure according to claim 8, characterized in that: The width of the drainage groove (1) has a numerical range of 0.5 mm to 50 mm, including the end values, and the width of the main channel (2-1) and the branch channel (2-2) has a numerical range of 0.1 mm to 2 mm, including the end values.

10. A kinematic pair of a mechanical bearing device, comprising a kinematic pair matching component with end faces abutting against each other, the kinematic pair matching component being in a circular ring shape or a flat plate shape, characterized in that: The end face of the kinematic pair mating component is provided with an end face micro-texture structure as described in any one of claims 1 to 9. When the kinematic pair mating components are all in annular shape, the fluid dynamic pressure units are distributed in an annular array; when the kinematic pair mating components are in a flat plate shape, the fluid dynamic pressure units are distributed in a linear array.

Images