Improved plunger pump valve plate

Abstract

The utility model relates to an improved plunger pump valve plate, which comprises an upper valve plate and a valve plate base, an O-shaped sealing ring is arranged on the valve plate base at the joint of the upper valve plate and the valve plate base, a central through hole is arranged in the center of the upper valve plate and the valve plate base, an oil suction window is arranged on one side of the central through hole, and an oil pressing window is arranged on the other side of the central through hole. A super-hydrophobic lubrication area is arranged on the portion, between the oil suction window and the oil pressing window, of the upper valve plate, the super-hydrophobic lubrication area comprises a plurality of cylindrical microstructures, the cylindrical microstructures comprise square column structures, triangular column structures, trapezoidal column structures and cylindrical structures, and hydrophobic microstructures are arranged on the super-hydrophobic lubrication area and the cylindrical microstructures. The hydrophobic surface can achieve super-hydrophobicity, the lubricating performance is improved, friction is reduced, and the application range is wide.

Description

Technical Field

[0001] The utility model belongs to the field of hydraulic pumps, and particularly relates to a valve plate of a piston pump. Background Art

[0002] The axial piston pump is one of the most important hydraulic components and is widely used in the fields of construction machinery, metallurgical equipment, aerospace, transportation, etc. In the actual application of the axial piston pump, it is found that the surface pressure distribution of the valve plate is uneven, which will generate an eccentric load moment, cause eccentric wear on the surface of the valve plate, a decrease in volumetric efficiency, and a reduction in service life. With the rapid development of science and technology, the axial piston pump is developing towards high pressure, high speed, and large flow, and higher requirements are put forward for the performance of the axial piston pump. Improving the performance of the valve plate is of extremely important significance for the development of the axial piston pump.

[0003] At present, the patented technologies such as "High-pressure large-displacement swashplate axial piston pump" (CN200720138344.4) and "A valve plate for a hydraulic motor" (CN201220553546.6) do not mention the wear of the valve plate due to eccentric load and do not propose solutions.

[0004] Based on the above and relevant technical materials, the existing technologies have the following problems in dealing with the valve plate: increasing costs, complex structures, narrow application ranges, and failure to solve problems such as eccentric load wear. Summary of the Utility Model

[0005] Object of the Invention: The object of the utility model is to overcome the deficiencies in the prior art and provide an improved valve plate of a piston pump with a hydrophobic surface that can achieve superhydrophobicity, improve lubrication performance, reduce friction, and have a wide application range.

[0006] Technical Solution: To solve the above technical problems, the improved valve plate of the piston pump described in the utility model includes an upper valve plate and a valve plate base. An O-ring seal is provided on the valve plate base at the connection between them. A central through-hole is provided at the center of the upper valve plate and the valve plate base. An oil suction window is provided on one side of the central through-hole, and a pressure oil window is provided on the other side. A superhydrophobic lubrication area is provided on the upper valve plate between the oil suction window and the pressure oil window. The superhydrophobic lubrication area includes a number of columnar microstructures. The columnar microstructures include square column structures, triangular column structures, trapezoidal column structures, and cylindrical structures. A hydrophobic microstructure is provided on the superhydrophobic lubrication area and the columnar microstructures.

[0007] Furthermore, the upper valve plate includes a plate body and a positioning boss, which are integrally formed. The positioning boss is provided at the outer ring position on one side of the plate body. A connection groove is provided on the valve plate base corresponding to the positioning boss. The O-ring seal is provided on the valve plate base inside the connection groove.

[0008] Further, the upper flow distribution plate is made of epoxy resin.

[0009] Further, the upper flow distribution plate is made of polytetrafluoroethylene.

[0010] Further, the base of the flow distribution plate is made of 45# steel.

[0011] Further, the hydrophobic microstructure is a pit-type microstructure.

[0012] Further, the free distance between the upper flow distribution plate and the base of the flow distribution plate is 10 - 20 μm.

[0013] Further, there are two superhydrophobic lubrication zones in total, and the cross-section of each superhydrophobic lubrication zone is fan-shaped.

[0014] The specific operation steps for preparing the hydrophobic surface on the upper flow distribution plate in the present utility model by chemical etching method and template method are as follows:

[0015] Use NaOH to chemically etch the silicon wafer to etch out micro-nano structures on the silicon wafer, and obtain the initial template with uniformly distributed micro-nano structures on the SMP surface. First, take out the silicon wafer with micro-structures and set it aside. Then, prepare a 10% NaOH solution with solid NaOH. Put the silicon wafer into a glass container, pour in the NaOH solution until the silicon wafer is submerged, and carry out chemical etching for 2 hours. The chemical reaction formula is as follows:

[0016] Si + 2NaOH + H2O → Na2SiO3 + 2H2↑

[0017] Finally, take out the etched silicon wafer, wash it clean with ultrapure water and dry it, then obtain the silicon wafer mold with uniformly distributed micro-nano structures. Using the etched silicon wafer as a template, a surface with uniformly distributed micro-nano structures can be prepared by the mold method through two casting processes.

[0018] Select the relatively soft PDMS material at room temperature as the intermediate mold to ensure the structural integrity of the surface treated with SMP for demolding. After the preparation of different micro-nano structures on the silicon wafer surface is completed, it needs to be transferred to the uniformly distributed surface through the intermediate mold PDMS. Mix the A and B adhesives of PDMS according to the ratio and pour them on the silicon wafer with uniformly distributed micro-structures, and wait for it to solidify and then take it off for standby. The preparation method of PDMS is as follows: Put the prepared lithography wafer into a container, dropwise add 100 μL of LMCS solution, then seal it to make it volatilize and deposit on the wafer surface to produce an anti-adhesion effect. Mix the PDMS A adhesive and B adhesive in a ratio of 10:1, and defoam it under vacuum (133 Pa) for about half an hour. Pour the defoamed PDMS mixture into the container with the silicon wafer, and put it into a vacuum drying oven at 85 - 90 °C for curing for one hour. Then carefully peel off the cured PDMS to obtain the PDMS intermediate mold.

[0019] After preparing the PDMS intermediate mold by uniformly distributing micro-nano structures on the silicon wafer, it is set aside for later use. Put the epoxy resin E-51 into a clean beaker, heat it with a magnetic stirring heater at 90 °C for 5 min, then add a certain proportion of the curing agent 4,4-diaminodiphenylmethane (epoxy resin: DDM = 10 g: 1.2 g), and heat it to 110 °C for 10 min until the epoxy resin and the curing agent are evenly mixed and no bubbles can be seen with the naked eye. Since the prepared PDMS intermediate mold is relatively small and cannot be directly molded, it is necessary to bond the PDMS intermediate mold and the special silicone mold to form a combined mold, and then pour the stirred epoxy resin liquid into the combined mold. Finally, the combined mold containing the epoxy resin is placed in a vacuum drying oven at 80 °C under vacuum (133 Pa) for half an hour, then cured at 80 °C for 150 minutes, and kept warm at 150 °C for 180 minutes. Finally, the cured epoxy resin is carefully peeled off from the intermediate mold to obtain a surface with uniformly distributed microstructures.

[0020] According to the effect of the micro-nano structure scale, the prepared surface can achieve superhydrophobicity. The form of the water droplet when it reaches stability at 1 s after dropping on the sample surface is obtained by taking a screenshot with a goniometer. It is found that the contact angle of the water droplet on the surface with uniformly distributed micro-nano structures is greater than 150°.

[0021] In the present utility model, when the plunger pump is sucking and pressing oil, under the action of the O-ring seal, the upper distribution plate can float, adapt to the pressure change, and maintain the planar contact between the upper distribution plate and the oil suction and pressure sides of the cylinder block.

[0022] Beneficial effects: Compared with the prior art, the significant advantages of the present utility model are:

[0023] 1. With this structure, when the plunger pump is sucking and pressing oil, under the action of the O-ring seal, the upper distribution plate can float, adapt to the pressure change, maintain a certain thickness of the oil film, and overcome the adverse effects of eccentric load on the distribution plate;

[0024] 2. A damping groove is provided. Three damping grooves with different lengths and depths and a triangular cross-section are added before entering the oil pressure port and before entering the oil suction port, so that when entering the oil pressure window, the flow rate can be gradually increased, which is beneficial to vibration reduction and noise reduction;

[0025] 3. On the transition plane between the oil suction and pressure ports of the upper distribution plate, a superhydrophobic lubrication area is provided. The superhydrophobic lubrication area includes a number of columnar microstructures. The columnar microstructures include square column structures, triangular column structures, trapezoidal column structures, and cylindrical structures. Hydrophobic microstructures are provided on the superhydrophobic lubrication area and the columnar microstructures. Since the hydrophobic microstructures are evenly distributed, the contact area between the water droplet and the surface can be reduced, and the contact angle can be further increased by reducing the contact area, resulting in a hydrophobic surface, improving the lubrication performance, and reducing friction;

[0026] 4. The upper distribution disk is made of epoxy resin or polytetrafluoroethylene. The contact plane between the cylinder block and the upper distribution disk does not need to be plated with copper material, and the material of the cylinder block itself is directly used, which saves processing time and cost. Description of the Drawings

[0027] Figure 1 is the front structural schematic diagram of the present utility model;

[0028] Figure 2 is the side cross-sectional view of the present utility model;

[0029] Figure 3 is the cross-sectional view of the upper distribution disk in the present utility model;

[0030] Figure 4 is the cross-sectional view of the distribution disk base in the present utility model;

[0031] Figure 5 is the partial structural schematic diagram of the hydrophobic micro-structure in the present utility model. Detailed Embodiment

[0032] The present utility model will be further described below with reference to the drawings and embodiments. Embodiment 1

[0033] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the improved distribution disk of the plunger pump according to the present utility model includes an upper distribution disk 1 and a distribution disk base 2. An O-ring seal 3 is provided on the distribution disk base 2 at their connection. The free distance between the upper distribution disk 1 and the distribution disk base 2 is 10 - 20 μm. The upper distribution disk 1 is made of epoxy resin or polytetrafluoroethylene, and the distribution disk base 2 is made of 45# steel. A central through hole 4 is provided at the center of the upper distribution disk 1 and the distribution disk base 2. An oil suction window 5 is provided on one side of the central through hole 4, and a pressure oil window 6 is provided on the other side. A super-hydrophobic lubrication area 7 is provided on the upper distribution disk 1 between the oil suction window 5 and the pressure oil window 6. There are two super-hydrophobic lubrication areas 7 in total, and the cross-section of each super-hydrophobic lubrication area 7 is fan-shaped. The super-hydrophobic lubrication area 7 includes a number of columnar micro-structures 8. The columnar micro-structures 8 are cylindrical structures. A hydrophobic micro-structure 9 is provided on the super-hydrophobic lubrication area 7 and the columnar micro-structures 8. The hydrophobic micro-structure 9 is a concave-pit type micro-structure. The upper distribution disk 1 includes a disk body 10 and a positioning boss 11, which are integrally formed. The positioning boss 11 is provided at the outer circle position on one side of the disk body 10. A connection groove 12 is provided on the distribution disk base 2 corresponding to the positioning boss 11. The O-ring seal 3 is provided on the distribution disk base 2 inside the connection groove 12. Example 2

[0034] As Figure 2 、 Figure 3 、 Figure 4 and Figure 5 shown, the improved valve plate of the plunger pump of the present utility model includes an upper valve plate 1 and a valve plate base 2. An O-ring seal 3 is provided on the valve plate base 2 at their connection. The free distance between the upper valve plate 1 and the valve plate base 2 is 10 - 20 μm. The upper valve plate 1 is made of epoxy resin or polytetrafluoroethylene, and the valve plate base 2 is made of 45# steel. A central through-hole 4 is provided at the center of the upper valve plate 1 and the valve plate base 2. An oil suction window 5 is provided on one side of the central through-hole 4, and an oil pressure window 6 is provided on the other side. A superhydrophobic lubricating area 7 is provided on the upper valve plate 1 between the oil suction window 5 and the oil pressure window 6. There are two superhydrophobic lubricating areas 7 in total. The cross-section of each superhydrophobic lubricating area 7 is fan-shaped. The superhydrophobic lubricating area 7 includes a number of columnar microstructures 8. The columnar microstructures 8 are square column structures. A hydrophobic micro-structure 9 is provided on the superhydrophobic lubricating area 7 and the columnar microstructures 8. The hydrophobic micro-structure 9 is a concave-pit micro-structure. The upper valve plate 1 includes a disk body 10 and a positioning boss 11, which are integrally formed. The positioning boss 11 is provided at the outer ring position on one side of the disk body 10. A connection groove 12 is provided on the valve plate base 2 corresponding to the positioning boss 11. The O-ring seal 3 is provided on the valve plate base 2 inside the connection groove 12. Example 3

[0035] As Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown in the figure, the improved port plate of the plunger pump of the present utility model includes an upper port plate 1 and a port plate base 2. An O-ring seal 3 is provided on the port plate base 2 at their connection. The free distance between the upper port plate 1 and the port plate base 2 is 10 - 20 μm. The upper port plate 1 is made of epoxy resin or polytetrafluoroethylene, and the port plate base 2 is made of 45# steel. A central through-hole 4 is provided at the center of the upper port plate 1 and the port plate base 2. An oil suction window 5 is provided on one side of the central through-hole 4, and an oil pressure window 6 is provided on the other side. A superhydrophobic lubrication area 7 is provided on the upper port plate 1 between the oil suction window 5 and the oil pressure window 6. There are two superhydrophobic lubrication areas 7 in total. The cross-section of each superhydrophobic lubrication area 7 is fan-shaped. The superhydrophobic lubrication area 7 includes a number of columnar microstructures 8. The columnar microstructures 8 are triangular column structures. A hydrophobic microstructure 9 is provided on the superhydrophobic lubrication area 7 and the columnar microstructures 8. The hydrophobic microstructure 9 is a concave pit microstructure. The upper port plate 1 includes a disc body 10 and a positioning boss 11, which are integrally formed. The positioning boss 11 is provided at the outer ring position on one side of the disc body 10. A connection groove 12 is provided on the port plate base 2 corresponding to the positioning boss 11. The O-ring seal 3 is provided on the port plate base 2 inside the connection groove 12. Example 4

[0036] As Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in the figure, the improved port plate of the plunger pump of the present utility model includes an upper port plate 1 and a port plate base 2. An O-ring seal 3 is provided on the port plate base 2 at their connection. The free distance between the upper port plate 1 and the port plate base 2 is 10 - 20 μm. The upper port plate 1 is made of epoxy resin or polytetrafluoroethylene, and the port plate base 2 is made of 45# steel. A central through-hole 4 is provided at the center of the upper port plate 1 and the port plate base 2. An oil suction window 5 is provided on one side of the central through-hole 4, and an oil pressure window 6 is provided on the other side. A superhydrophobic lubrication area 7 is provided on the upper port plate 1 between the oil suction window 5 and the oil pressure window 6. There are two superhydrophobic lubrication areas 7 in total. The cross-section of each superhydrophobic lubrication area 7 is fan-shaped. The superhydrophobic lubrication area 7 includes a number of columnar microstructures 8. The columnar microstructures 8 are trapezoidal column structures. A hydrophobic microstructure 9 is provided on the superhydrophobic lubrication area 7 and the columnar microstructures 8. The hydrophobic microstructure 9 is a concave pit microstructure. The upper port plate 1 includes a disc body 10 and a positioning boss 11, which are integrally formed. The positioning boss 11 is provided at the outer ring position on one side of the disc body 10. A connection groove 12 is provided on the port plate base 2 corresponding to the positioning boss 11. The O-ring seal 3 is provided on the port plate base 2 inside the connection groove 12.

[0037] When the plunger pump sucks and discharges oil in the utility model, under the action of the O-ring seal, the upper valve plate can float to adapt to the pressure change, maintain a certain thickness of the oil film, and overcome the adverse effects of eccentric load on the valve plate. A damping groove is provided, and three damping grooves with different lengths and depths and a triangular cross-section are added before entering the oil discharge port and before entering the oil suction port, so that when entering the oil discharge window, the flow rate can be gradually increased, which is beneficial to reducing vibration and noise. On the transition plane between the oil suction and discharge windows of the upper valve plate, a superhydrophobic lubrication area is provided. The superhydrophobic lubrication area includes a number of columnar microstructures, and the columnar microstructures include square column structures, triangular column structures, trapezoidal column structures, and cylindrical structures. Hydrophobic microstructures are provided on the superhydrophobic lubrication area and the columnar microstructures. Since the hydrophobic microstructures are evenly distributed, the contact area between the water droplets and the surface can be reduced, and the contact angle can be further increased by reducing the contact area, resulting in the surface showing hydrophobicity, improving the lubrication performance, and reducing friction. The material used for the upper valve plate is epoxy resin or polytetrafluoroethylene. The contact plane between the cylinder block and the upper valve plate does not need to be plated with copper material, and the cylinder block itself material is directly used, which saves processing time and cost.

[0038] The utility model provides an idea and method. There are many methods and ways to specifically implement the technical solution. The above is only the preferred embodiment of the utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the utility model. Each component not clearly defined in this embodiment can be realized by the prior art.

Claims

1. Improved valve plate of plunger pump, characterized in that: It includes an upper flow distribution plate (1) and a flow distribution plate base (2). An O-ring seal (3) is provided on the flow distribution plate base (2) at their connection. A central through-hole (4) is provided at the center of the upper flow distribution plate (1) and the flow distribution plate base (2). An oil suction window (5) is provided on one side of the central through-hole (4), and an oil pressure window (6) is provided on the other side. A superhydrophobic lubrication area (7) is provided on the upper flow distribution plate (1) between the oil suction window (5) and the oil pressure window (6). The superhydrophobic lubrication area (7) includes a number of columnar microstructures (8). The columnar microstructures (8) include square column structures, triangular column structures, trapezoidal column structures, and cylindrical structures. A hydrophobic microstructure (9) is provided on the superhydrophobic lubrication area (7) and the columnar microstructures (8).

2. The improved port plate of the plunger pump according to claim 1, characterized in that: The upper flow distribution plate (1) includes a plate body (10) and a positioning boss (11), which are integrally formed. The positioning boss (11) is provided at the outer ring position on one side of the plate body (10). A connection groove (12) is provided on the flow distribution plate base (2) corresponding to the positioning boss (11). The O-ring seal (3) is provided on the flow distribution plate base (2) inside the connection groove (12).

3. The improved valve plate of the plunger pump according to claim 1, characterized in that: The upper flow distribution plate (1) is made of epoxy resin.

4. The improved port plate of a plunger pump according to claim 1, characterized in that: The upper flow distribution plate (1) is made of polytetrafluoroethylene.

5. The improved port plate of the plunger pump according to claim 1, characterized in that: The flow distribution plate base (2) is made of 45# steel.

6. The improved valve plate of the plunger pump according to claim 1, wherein: The hydrophobic microstructure (9) is a concave pit type microstructure.

7. The improved port plate of the plunger pump according to claim 1, characterized in that: The free distance between the upper flow distribution plate (1) and the flow distribution plate base (2) is 10 - 20um.

8. The improved valve plate of the plunger pump according to claim 1, characterized in that: There are two superhydrophobic lubrication areas (7) in total, and the cross-section of each superhydrophobic lubrication area (7) is fan-shaped.

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