CN114412741A - Seawater axial plunger pump flow distribution pair with bionic hydrophobic surface - Google Patents
Seawater axial plunger pump flow distribution pair with bionic hydrophobic surface Download PDFInfo
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- CN114412741A CN114412741A CN202111592578.7A CN202111592578A CN114412741A CN 114412741 A CN114412741 A CN 114412741A CN 202111592578 A CN202111592578 A CN 202111592578A CN 114412741 A CN114412741 A CN 114412741A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/08—Cylinder or housing parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/50—Presence of foreign matter in the fluid
- F04B2205/501—Presence of foreign matter in the fluid of solid particles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a flow distribution pair of a seawater axial plunger pump with a bionic hydrophobic surface, which comprises a flow distribution disc and a cylinder body; the surface of the valve plate and/or the cylinder body is provided with a plurality of bionic composite textures, and a layer of hydrophobic film is attached to the bionic composite textures. The bionic composite texture is applied to the flow distribution pair, and the bionic composite texture is combined with the hydrophobic surface prepared by the surface modifier, so that the friction coefficient between the flow distribution disc and the cylinder body of the seawater axial plunger pump flow distribution pair can be reduced under the working conditions of high speed, heavy load and seawater lubrication, and the wear resistance and corrosion resistance of the seawater axial plunger pump flow distribution pair are improved.
Description
Technical Field
The invention relates to an axial plunger pump flow distribution pair applied to seawater, in particular to a seawater axial plunger pump flow distribution pair with a bionic composite texture and a hydrophobic film on the surface. The invention belongs to the technical field of high-pressure seawater axial plunger pumps.
Background
The core power element of the seawater hydraulic system in the seawater hydraulic transmission and control system, the reverse osmosis seawater desalination system, the deep submersible vehicle, the underwater unmanned submersible vehicle buoyancy regulating system and the like is a high-pressure seawater axial plunger pump, and the flow distribution pair is a friction pair with the largest structure in the seawater axial plunger pump and is also one of friction pairs which are easy to wear and lose efficacy in the seawater axial plunger pump. The flow distribution pair runs in a water environment with poor lubricating effect, and has strong corrosion effect due to low seawater viscosity, extremely poor lubricating property, high gasification pressure and particularly has a lot of granular abrasive particles with complex components in seawater, so that the flow distribution pair is easy to lose efficacy due to corrosion, abrasion, cavitation and other reasons under the working conditions of high speed and heavy load, the normal work and the service life of the high-pressure seawater axial plunger pump are seriously influenced, and the working stability of the whole system and equipment is also influenced.
In recent years, a surface texture technology capable of remarkably improving the surface performance of a workpiece is widely concerned by domestic and foreign scientific researchers, and researches show that the performance of a composite texture is superior to that of a single texture under a specific working condition of the surface of the workpiece. However, the current design of the compound texture on the surface of the distribution pair of the seawater axial plunger pump and the topological distribution of the compound texture are weak. In order to meet the actual working condition requirements, it is very important how to design the surface composite texture of the flow distribution pair to improve the tribological performance of the surface of the flow distribution pair of the seawater axial plunger pump, reduce the wear rate of the flow distribution pair and prolong the service life of the seawater axial plunger pump.
In addition, how to change the surface wettability of the flow distribution pair of the existing seawater axial plunger pump is also very important to improve the surface tribological performance of the flow distribution pair and reduce the wear rate of the flow distribution pair.
Disclosure of Invention
In view of the above, the invention aims to provide a seawater axial plunger pump distribution pair with a bionic hydrophobic surface. By designing the surface structure of the flow distribution pair, the invention obviously improves the tribological property of the surface of the flow distribution pair under the complex working conditions of seawater high pressure, heavy load, lubrication and the like of the flow distribution pair of the seawater axial plunger pump, greatly reduces the wear rate of the surface of the flow distribution pair and improves the wear resistance and corrosion resistance of the flow distribution pair of the seawater axial plunger pump.
In order to achieve the purpose, the invention adopts the following technical scheme that the seawater axial plunger pump flow distribution pair with the bionic hydrophobic characteristic on the surface comprises a flow distribution plate and a cylinder body; the surface of the valve plate and/or the cylinder body is provided with a plurality of strip-shaped bionic composite textures, the bionic composite textures extend from the circle center of the valve plate and/or the cylinder body from inside to outside to form an involute-like shape, and the direction of the bionic composite textures extending from inside to outside is opposite to the rotation direction of the valve pair;
the bionic composite texture at least comprises a diatom-like shell multistage pit texture, and the diatom-like shell multistage pit textures on the same bionic composite texture are communicated through an arc-shaped groove texture;
the diatom-like shell multistage pit texture is composed of a plurality of coaxial pits with different depths, different shapes and different cross-sectional areas, wherein the inner diameters of the coaxial pits are gradually reduced;
and a layer of hydrophobic film is also attached to the surface of the valve plate and/or the cylinder body, the surface of which is provided with the bionic composite texture.
Preferably, the first-stage pits forming the diatom-like shell multi-stage pit texture are inverted frustum-shaped pits, the diameter phi 1 of the lower bottom of each pit is 150-225 μm, the diameter phi 2 of the upper bottom of each pit is 100-150 μm, and the depth h of each pit is1＝10～15μm。
Preferably, the secondary pits forming the imitation diatom shell multi-level pit texture are cylindrical pits or square cylindrical pits, the side length or diameter phi 2 of the secondary pits is 100-150 mu m, and the depth h of each pit is2＝10～30μm。
Preferably, the diatom-like shell multi-stage pit textures are uniformly distributed on the surface of the valve plate and/or the surface of the cylinder body in concentric circles, the diatom-like shell multi-stage pit textures on each concentric circle are sequentially distributed at equal angles, the adjacent diatom-like shell multi-stage pit textures on the adjacent concentric circle arrays are staggered, and the angular offset rate between the two adjacent diatom-like shell multi-stage pit textures staggered from inside to outside on the two adjacent concentric circle arrays is 0.1-0.5;
the connection line included angle between the diatom-like shell multistage pit texture on each distribution circle and the centers of the diatom-like shell multistage pit textures in the same direction on the inner and outer adjacent distribution circles is 60 degrees.
Preferably, the depth of the circular arc-shaped groove texture is the same as that of the first-stage inverted-truncated-cone-shaped pit of the diatom-shell-like multi-stage pit texture, the depth of the circular arc-shaped groove texture is 10-15 micrometers, and the width of the circular arc-shaped groove texture is 100-150 micrometers.
Preferably, the method for attaching the hydrophobic film to the surface of the port plate and/or the cylinder body comprises the following steps:
s1: the cleaning surface is provided with a bionic composite textured valve plate and/or cylinder surface;
s2: preparing a surface modifier solution: mixing a surface modifier and 99% absolute ethyl alcohol according to a volume ratio of 1: 200-1: 100 percent of the mixture is mixed to prepare a surface modifier-ethanol solution with the volume fraction of 5 to 10 per mill;
s3: soaking the cleaned valve plate and/or cylinder body in a surface modifier solution for 20-60min, taking out, cleaning, then placing in a drying oven at 80-100 ℃ for drying for 30-60min, taking out, cooling, then respectively carrying out ultrasonic cleaning in acetone, absolute ethyl alcohol and deionized water for 10-20min, removing the molecular membrane on the surface, drying, and designing the valve plate and/or cylinder body with the bionic composite texture on the surface, namely attaching the hydrophobic membrane.
Preferably, the surface modifier is a perfluorosilane or a fatty acid or polytetrafluoroethylene or an organophosphonic acid.
Preferably, when the bionic composite texture is arranged on the surface of the cylinder body, the area of the bionic composite texture on the surface of the cylinder body accounts for 5% -30% of the surface area of the cylinder body.
Preferably, when the bionic composite texture is uniformly arranged on the surface of the valve plate, the area of the bionic composite texture on the surface of the valve plate accounts for 5% -30% of the surface area of the valve plate.
Preferably, when the bionic composite texture is non-uniformly arranged on the surface of the valve plate, the area of the bionic composite texture on one side of the oil suction cavity of the valve plate accounts for 15% -30% of the surface area of one side of the oil suction cavity of the valve plate; on one side of the oil pressing cavity of the valve plate, the area of the bionic composite texture accounts for 5% -15% of the surface area of the oil pressing cavity of the valve plate.
By adopting the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the diatom-shell-like composite texture is designed on the surface of the flow distribution pair, so that the surface of the flow distribution pair can better store granular abrasive particles in seawater, the abrasive particles are prevented from being directly and rigidly rubbed with the surface of the flow distribution pair, and the friction coefficient of the surface of the flow distribution pair is effectively reduced.
2. The invention adopts the bionic composite texture design to generate stronger local dynamic pressure support, so that the dynamic pressure bearing capacity of the surface of the flow distribution pair is improved by more than two times.
3. The bionic composite texture on the surface of the flow distribution pair is designed into an involute-like shape extending from inside to outside, so that the liquid flow on the surface of the flow distribution pair is facilitated, the flow speed of seawater in the rotation direction of the flow distribution pair is increased, the bearing capacity of a lubricating liquid film on the surface of the flow distribution pair is improved, and the stability of the lubricating liquid film is increased.
4. The bionic composite texture on the surface of the flow distribution pair is designed into an involute-like shape extending from inside to outside, the utilization rate of the multi-stage pit texture forming the composite texture can be improved, abrasive grains in a part of pits are cleaned through the flow of seawater, and when one pit is filled with the abrasive grains, the abrasive grains are conveyed to other unfilled pits through the groove texture under the drive of the seawater, so that the damage of overflow of the abrasive grains to the pit texture is effectively avoided, and the service life of the pit texture is prolonged.
5. The invention also improves the wettability of the surface of the flow distribution pair by attaching a layer of hydrophobic film on the surface of the flow distribution plate and/or the cylinder body, changes the lubricating property of the flow distribution pair, reduces the friction coefficient and viscous resistance of the flow distribution pair in the friction process and further improves the tribological property of the flow distribution pair. Meanwhile, in the friction process of the valve plate and the cylinder body, friction particles in seawater can be stored in the surface bionic composite texture, and the hydrophobic film is more stable.
6. According to the invention, the material of the flow distribution pair is not required to be changed, redundant parts are not required to be added, and the performance of the flow distribution pair of the seawater axial plunger pump can be improved only by changing the micro-morphology on the surface of the flow distribution pair, so that the performance of the flow distribution pair of the seawater axial plunger pump is improved. The invention has convenient processing process and easy realization, and can be used for large-scale production.
Drawings
FIG. 1 is a schematic structural view of a flow distribution auxiliary port plate of a conventional seawater axial plunger pump;
FIG. 2 is a schematic structural view of a flow distribution auxiliary cylinder body of a conventional seawater axial plunger pump;
FIG. 3 is a schematic view of a three-dimensional structure of a flow distribution auxiliary cylinder body of the seawater axial plunger pump with a bionic composite texture on the surface;
FIG. 4 is a top view of a flow distribution auxiliary valve plate of the seawater axial plunger pump with a bionic composite texture on the surface;
FIG. 5 is a partial enlarged view of the bionic composite texture of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 7 is a cross-sectional view of a secondary dimple texture of a frustule-like structure according to the present invention;
FIG. 8 is an enlarged view B of FIG. 6 showing a cross-sectional view of a three-level pit texture of a frustule-like structure according to the present invention;
FIG. 9 is a cross-sectional view of a four-level pit texture of a simulated frustule of the present invention;
FIG. 10 is a cross-sectional view of another frustule-like triple-pit texture of the present invention;
FIG. 11 is a cross-sectional view of a three-level pit texture of a simulated frustule of the present invention;
FIG. 12 is a view of arrangement angles of the bionic composite texture according to the present invention;
FIG. 13 is a perspective view of another embodiment of the port plate of the present invention;
fig. 14 is a cross-sectional view of a port plate of the present invention.
The main reference numbers: 1. the flow distribution plate comprises a flow distribution plate 11, a waist-shaped flow distribution window 12, an oil suction cavity side 13, an oil pressing cavity side 2, a cylinder body 21, an end face flow distribution window 3, a bionic composite texture 31, a diatom shell imitating multistage pit texture 32, an arc-shaped groove texture 311, a first-stage pit 312, a second-stage pit 313, a third-stage pit 314, a fourth-stage pit 4 and a hydrophobic film.
Detailed Description
Hereinafter, exemplary embodiments and features of the present invention will be described in detail with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements of function and, although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
As shown in figures 1 and 2, the seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface comprises a flow distribution disc 1 and a cylinder body 2. Two kidney-shaped flow distribution windows 11 are formed in the surface of the flow distribution plate 1, wherein one kidney-shaped flow distribution window corresponds to an oil suction cavity of the seawater axial plunger pump, and the other kidney-shaped flow distribution window corresponds to a pressure oil cavity of the seawater axial plunger pump. The surface of the cylinder body 2 is provided with a plurality of end face flow distribution windows 21. The valve plate 1 and the cylinder body 2 are matched for use, and a lubricating medium flows into the oil suction cavity of the axial plunger pump through the valve plate kidney-shaped valve window 11 and the cylinder body end face valve window 21 and then flows out of the oil suction cavity through the valve plate kidney-shaped valve window 11 and the cylinder body end face valve window 21.
As shown in fig. 1 and 2, the surfaces of the conventional port plate 1 and cylinder 2 are smooth, and the wear rate of the port pair is high due to low viscosity of seawater, extremely poor lubricity, high gasification pressure, and strong corrosivity, and a lot of abrasive grains with complex components exist in the seawater, so that the port plate is easy to lose effectiveness due to corrosion, abrasion, cavitation and the like. The inventor of the invention has found through long-term observation and research that under the same marine environment, because the surface of the frustules has a multi-level pore structure, when the diatom moves, the multi-level pore structure on the surface of the frustules does not obstruct the movement of the diatom, but can obviously reduce the friction between the surface of the frustules and seawater when the diatom moves, and simultaneously increase the bearing capacity of the frustules, so that the diatom can freely move in the seawater and can live in the seawater for a long time, therefore, the inventor simulates the frustules and designs a bionic composite texture on the surface of a seawater axial plunger pump flow distribution pair.
As shown in fig. 3-6, the surface of the port plate 1 and/or the cylinder body 2 of the seawater axial plunger pump port pair is designed with a plurality of strip-shaped bionic composite textures 3, the bionic composite textures 3 extend from the center of the port plate and the cylinder body from the inside to the outside to form an involute-like shape, and the direction of the extension of the bionic composite textures 3 from the inside to the outside is opposite to the rotation direction of the port pair.
As shown in the figure, each bionic composite texture 3 at least comprises one frustule-like multi-level pit texture 31, and the frustule-like multi-level pit textures 31 on the same bionic composite texture are communicated with each other through an arc-shaped groove texture 32. The multi-level concave pit texture 31 of the imitation diatom shell consists of a plurality of coaxial concave pits with different depths, different shapes and different cross sections, and the inner diameters of the coaxial concave pits gradually decrease. The imitation frustules multi-level pit texture 31 may be two-level pits as shown in fig. 7, three-level pits as shown in fig. 8, four-level pits as shown in fig. 9, and a fourth-level pit 314 as a cylindrical pit … ….
As shown in fig. 8, in the preferred embodiment of the present invention, the frustule-like multi-level pit texture 31 is a three-level pit, the pits at all levels are coaxial from top to bottom and have gradually decreasing inner diameters, the first-level pit 311 is an inverted truncated cone-shaped pit, the diameter of the bottom phi 1 is 150 to 225 μm, the diameter of the top phi 2 is 100 to 150 μm, and the depth h of the pit is110 to 15 μm. The second-level pits 312 are cylindrical pits, such as cylindrical pits or square-cylindrical pits, having a side length or diameter phi 2 of 100 μm to 150 μm and a pit depth h 210 to 30 μm. The third-level pits 313 are square-column pits or cylindrical pits, the side length or the diameter phi 3 of each of the third-level pits is 50-75 mu m, and the pit depth h is3＝10～25μm。
The frustule-like multi-level pit texture 31 shown in fig. 10 is also a three-level pit, the first-level pit 311 is an inverted truncated cone-shaped pit, the second-level pit 312 is a cylindrical pit, and the third-level pit 313 is a conical pit.
The imitation frustules multi-level pit texture 31 shown in fig. 11 is also a three-level pit, which is different from the three-level pits shown in fig. 8 and 10 in that: the third-level pits 313 are hemispherical pits.
The multi-stage pit texture 31 of the bionic frustule forming the bionic composite texture 3 can be uniformly distributed on the surfaces of the valve plate and the cylinder body and can also be non-uniformly distributed on the surfaces of the valve plate and the cylinder body. In the embodiment of the invention, the diatom-like shell multistage pit texture 31 is regularly distributed on the surface of the port plate and/or the cylinder body. As shown in fig. 12, the frustules-like multi-stage pit textures 31 are uniformly arranged on the surface of the port plate and/or the surface of the cylinder body in concentric circles, a plurality of frustules-like multi-stage pit textures 31 on each concentric circle are sequentially distributed in an equal angle, the adjacent frustules-like multi-stage pit textures 31 on the adjacent concentric circle arrays are staggered, and the angular offset ratio between the adjacent two frustules-like multi-stage pit textures 31 staggered from inside to outside on the two adjacent concentric circle arrays is 0.1-0.5. The included angle of the connecting line of the imitated frustules multi-stage pit texture on each distribution circle and the centers of the two equidirectional imitated frustules multi-stage pit textures on the inner and outer adjacent distribution circles is 60 degrees.
The bionic frustule multilevel pit textures 31 on different concentric circular arrays forming the same bionic composite texture 3 are connected through the arc-shaped groove textures 32 to form the bionic composite texture 3 extending from inside to outside in an involute-like shape, and the extending direction of the bionic composite texture from inside to outside is opposite to the rotating direction of the flow distribution pair. The depth of the arc-shaped groove texture 32 is the same as the depth h1 of the first-stage inverted-truncated-cone-shaped pit 311 of the diatom-like shell multi-stage pit texture 31, the depth h1 is 10-15 micrometers, and the width of the arc-shaped groove texture is 100-150 micrometers.
The bionic composite texture on the surface of the port plate and/or the cylinder body is designed into an involute-like shape from inside to outside, so that the bionic composite texture is beneficial to the liquid flow on the surface of the port pair, the speed of seawater flowing in the rotating direction of the port pair is improved, the bearing capacity of a lubricating liquid film of the axial plunger pump is improved, and the stability of the lubricating liquid film is improved. Meanwhile, the utilization rate of a multi-stage pit texture forming the composite texture can be improved, a part of abrasive particles in the pits are cleaned through the flow of seawater, and after one pit is filled with the abrasive particles, the abrasive particles are conveyed to other unfilled pits through the groove texture under the drive of the seawater, so that the damage of the overflow of the abrasive particles to the pit texture is effectively avoided, the service life of the pit texture is prolonged, more importantly, the friction between the seawater and a flow distribution disc and a cylinder body is reduced, and the abrasion on the surfaces of the flow distribution disc and the cylinder body is reduced.
The bionic composite texture 3 can be uniformly distributed on the surface of the port plate 1 or non-uniformly distributed on the surface of the port plate. When the bionic composite texture is uniformly distributed on the surface of the flow distribution disc, the area occupancy rate of the bionic composite texture is 5-30%. When the bionic composite texture is non-uniformly distributed on the surface of the port plate, as shown in fig. 13, the area occupancy of the bionic composite texture on the surface of the port plate oil suction cavity side 12 is 15% -30%, and the area occupancy of the bionic composite texture on the surface of the port plate oil pressing cavity side 13 is 5% -15%. The design that the bionic composite texture is unevenly distributed on the surface of the flow distribution plate can improve the bearing capacity of a lubricating liquid film on the oil absorption cavity side of the flow distribution plate, so that the stress on the surface of the flow distribution pair is more uniform, and the eccentric wear of the surface of the flow distribution pair is effectively reduced.
When the surface of the cylinder body is designed with the bionic composite texture, the area occupancy rate of the bionic composite texture on the surface is 5-30%.
The invention is also inspired by the super-hydrophobic property and self-cleaning capability of lotus leaves, rice leaves and other leaves, besides the bionic composite texture is designed on the surface of the flow distribution pair, the bionic composite texture has certain capacity of storing a lubricating medium, and hydrophobic groups are modified on the surface of the flow distribution pair, so that the surface free energy is reduced, the bionic composite texture has hydrophobic property, the friction coefficient and the viscous resistance of the flow distribution pair in the friction process are reduced, and the friction and wear performance of the flow distribution pair is improved; meanwhile, the bionic coarse structure of the hydrophobic surface can stay in certain air, so that corrosive substances in seawater are difficult to contact with the base body of the flow distribution pair, the contact mode of a lubricating medium and the flow distribution pair is converted from solid-liquid contact into solid-liquid and solid-gas mixed contact, and the corrosion resistance of the flow distribution pair is improved.
As shown in FIG. 14, a layer of hydrophobic film 4 is attached to the surface of the valve plate 1 and/or the cylinder body 2, the surface of which is provided with the bionic composite texture 3.
The hydrophobic film 4 is made by the reaction of the surface modifier solution and the surface of the flow distribution pair. The surface modifier is perfluorosilane or fatty acid or polytetrafluoroethylene or organic phosphonic acid.
The method for attaching the hydrophobic film 4 to the surface of the port plate and/or the cylinder body comprises the following steps:
s1: the cleaning surface is provided with a bionic composite textured valve plate and/or cylinder body surface: respectively placing the valve plate and/or cylinder body with bionic composite texture on surface in acetone, anhydrous alcohol, and deionized water, ultrasonic cleaning for 10-20min, removing oil stain on surface, and blow-drying.
S2: preparing a surface modifier solution: mixing a surface modifier and 99% absolute ethyl alcohol according to a volume ratio of 1: 200-1: 100 percent of the mixture is mixed to prepare the surface modifier-ethanol solution with the volume fraction of 5 to 10 per mill.
S3: attaching a hydrophobic film on the surface of the port plate and/or the cylinder body: and (2) soaking the flow distribution plate and/or the cylinder body cleaned in the step S1 into the surface modifier solution prepared in the step S2 for 20-60m & lti & gt n & lt/i & gt, taking out and cleaning, then placing the flow distribution plate and/or the cylinder body in a drying box at the temperature of 80-100 ℃ for drying for 30-60min, taking out and cooling, then respectively carrying out ultrasonic cleaning in acetone, absolute ethyl alcohol and deionized water for 10-20min, removing more molecular films on the surface, and carrying out blow-drying to obtain the flow distribution plate and/or the cylinder body with hydrophobic properties and the surface designed with the bionic composite texture.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A seawater axial plunger pump flow distribution pair with a bionic hydrophobic surface comprises a flow distribution disc and a cylinder body; the method is characterized in that:
the surface of the valve plate and/or the cylinder body is provided with a plurality of strip-shaped bionic composite textures, the bionic composite textures extend from the circle center of the valve plate and/or the cylinder body from inside to outside to form an involute-like shape, and the direction of the extending of the bionic composite textures from inside to outside is opposite to the rotation direction of the valve pair;
the bionic composite texture at least comprises a diatom-like shell multistage pit texture, and the diatom-like shell multistage pit textures on the same bionic composite texture are communicated through an arc-shaped groove texture;
the diatom-like shell multistage pit texture is composed of a plurality of coaxial pits with different depths, different shapes and different cross-sectional areas, wherein the inner diameters of the coaxial pits are gradually reduced;
and a layer of hydrophobic film is also attached to the surface of the valve plate and/or the cylinder body, the surface of which is provided with the bionic composite texture.
2. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 1, wherein: the first-stage pits forming the diatom-like shell multistage pit texture are inverted frustum-shaped pits, the diameter phi 1 of the lower bottom of each pit is 150-225 mu m, the diameter phi 2 of the upper bottom of each pit is 100-150 mu m, and the depth h of each pit1＝10～15μm。
3. The seawater axial plunger pump flow distribution pair with bionic and hydrophobic surfaces as claimed in claim 2, wherein: the second-stage pits forming the diatom-like shell multi-stage pit texture are cylindrical pits or square cylindrical pits, the side length or the diameter phi 2 of the second-stage pits is 100-150 mu m, and the depth h of each pit2＝10～30μm。
4. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in one of claims 1 to 3, wherein: the diatom-like shell multistage pit textures are uniformly distributed on the surface of the valve plate and/or the surface of the cylinder body in concentric circles, the diatom-like shell multistage pit textures on each concentric circle are sequentially distributed in an equal angle, the adjacent diatom-like shell multistage pit textures on the adjacent concentric circular arrays are distributed in a staggered mode, and the angular offset rate between the two adjacent diatom-like shell multistage pit textures in the staggered mode on the two adjacent concentric circular arrays from inside to outside is 0.1-0.5;
the connection line included angle between the diatom-like shell multistage pit texture on each distribution circle and the centers of the diatom-like shell multistage pit textures in the same direction on the inner and outer adjacent distribution circles is 60 degrees.
5. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 4, wherein: the depth of the circular arc-shaped groove texture is the same as that of the first-stage inverted-truncated-cone-shaped pit of the diatom-shell-imitated multistage pit texture, the depth of the circular arc-shaped groove texture is 10-15 micrometers, and the width of the circular arc-shaped groove texture is 100-150 micrometers.
6. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 5, wherein: the method for attaching the hydrophobic film to the surface of the port plate and/or the cylinder body comprises the following steps:
s1: the cleaning surface is provided with a bionic composite textured valve plate and/or cylinder surface;
s2: preparing a surface modifier solution: mixing a surface modifier and 99% absolute ethyl alcohol according to a volume ratio of 1: 200-1: 100 percent of the mixture is mixed to prepare a surface modifier-ethanol solution with the volume fraction of 5 to 10 per mill;
s3: soaking the cleaned valve plate and/or cylinder body in a surface modifier solution for 20-60min, taking out, cleaning, then placing in a drying oven at 80-100 ℃ for drying for 30-60min, taking out, cooling, then respectively carrying out ultrasonic cleaning in acetone, absolute ethyl alcohol and deionized water for 10-20min, removing the molecular membrane on the surface, drying, and designing the valve plate and/or cylinder body with the bionic composite texture on the surface, namely attaching the hydrophobic membrane.
7. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 6, wherein: the surface modifier is perfluorosilane or fatty acid or polytetrafluoroethylene or organic phosphonic acid.
8. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 7, wherein: when the bionic composite texture is arranged on the surface of the cylinder body, the area of the bionic composite texture on the surface of the cylinder body accounts for 5% -30% of the surface area of the cylinder body.
9. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 7, wherein: when the bionic composite texture is uniformly arranged on the surface of the valve plate, the area of the bionic composite texture on the surface of the valve plate accounts for 5% -30% of the surface area of the valve plate.
10. The seawater axial plunger pump flow distribution pair with the bionic hydrophobic surface as claimed in claim 7, wherein: when the bionic composite texture is arranged on the surface of the valve plate in a non-uniform manner, the area of the bionic composite texture on one side of the oil suction cavity of the valve plate accounts for 15% -30% of the surface area of one side of the oil suction cavity of the valve plate; the area of the bionic composite texture on one side of the oil pressing cavity of the valve plate accounts for 5% -15% of the surface area of one side of the oil pressing cavity of the valve plate.
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| US20180017163A1 (en) * | 2015-02-14 | 2018-01-18 | Eagle Industry Co., Ltd. | Sliding component |
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| CN103850922A (en) * | 2014-02-24 | 2014-06-11 | 燕山大学 | High-pressure seawater axial plunger pump valve friction pair with bionic non-smooth surface |
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| US20180017163A1 (en) * | 2015-02-14 | 2018-01-18 | Eagle Industry Co., Ltd. | Sliding component |
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