High-pressure water pump lubricated with water or aqueous solution

Abstract

The present invention discloses a high-pressure water pump lubricated by water or an aqueous solution, and relates to the technical field of high-pressure water pumps. The high-pressure water pump lubricated by water or an aqueous solution includes a drive mechanism, a housing, a repulsion structure, at least one plunger, and a plunger chamber. The drive mechanism includes a main shaft and at least one eccentric structure provided on the main shaft, and a thrust structure is fitted on the outside of each eccentric structure, and the thrust structure and the eccentric structure can rotate relative to each other, and the thrust structure and the eccentric structure form a first sliding friction pair. The eccentric structure and the thrust structure are both located in a housing, and the space in the housing where the eccentric structure and the thrust structure are located is used to fill water or an aqueous solution, and the water or an aqueous solution can enter the first sliding friction pair in the housing. When the eccentric structure rotates, the thrust structure pushes the plunger to move in the plunger chamber to realize pressurization of the water or an aqueous solution, and the plunger moves in the plunger chamber due to the repulsion force of the repulsion structure to suck in the water or an aqueous solution. The present invention has a high output pressure and good contamination resistance.

Description

[Technical Field]

[0001] The present invention relates to the technical field of high-pressure water pumps, and in particular to high-pressure water pumps lubricated with water or aqueous solutions. [Background technology]

[0002] High-pressure water pumps are used to produce high-pressure water and are widely used as core components in fields such as high-pressure cleaning, high-pressure mist generation, fine mist fire extinguishing, seawater desalination, and high-pressure deburring.

[0003] Currently, the most widely used high-pressure water pumps are reciprocating pumps and water-lubricated axial plunger pumps.

[0004] Reciprocating pumps have a long history and are widely used to produce high-pressure water. They primarily consist of components such as a crankshaft, connecting rod, crosshead, and plunger. To lubricate the power end of a reciprocating pump with lubricating oil, a seal ring must be used to seal the pressurized water and isolate the water from the lubricating oil. The biggest problems with such pumps are the need to regularly replace the lubricating oil, which can pollute the environment, and the short lifespan of the seal ring, making replacement a hassle.

[0005] In the 1990s, Danfoss successfully commercialized water-lubricated axial plunger pumps. Compared to reciprocating pumps, water-lubricated axial plunger pumps offer advantages such as environmental friendliness and high energy efficiency. The main moving parts utilize hydrostatic support, achieving a maximum pressure output of 16 MPa. A water-lubricated plunger pump has also been filed in Chinese patent application CN105240237A. The main problems with these water-lubricated high-pressure water pumps are that they use a large number of hydrostatic support design elements, making it difficult to achieve higher pressures due to the impact of high-pressure water leakage. The hydrostatic support also makes the structure complex, making it susceptible to damage from contaminants, and placing high demands on water filtration accuracy.

[0006] High-pressure water pumps realized by power-end water lubrication technology are environmentally friendly and highly efficient, and are undoubtedly an important development direction for high-pressure pumps. However, water has low viscosity and poor lubrication properties compared to conventional materials, making it difficult to design an appropriate friction pair, and the high-performance materials that can be used with water are limited. For this reason, water-lubricated high-pressure water pumps that can produce higher pressures, are environmentally friendly, and are economical have not yet been commercialized. Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a high-pressure water pump lubricated by water or an aqueous solution, which can solve the problems of conventional water-lubricated high-pressure water pumps, such as their susceptibility to damage by contaminants and their low pressure output, and which has a simple structure. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides the following means.

[0009] The present invention provides a high-pressure water pump lubricated by water or an aqueous solution, the high-pressure water pump comprising a drive mechanism, a housing, a repulsion structure, at least one plunger, and At least one plunger having a one-to-one correspondence with the at least one plunger The drive mechanism includes a main shaft and a plunger chamber. , which correspond one-to-one to the at least one plunger The thrust structure is fitted onto the outside of each eccentric structure, and the thrust structure and the eccentric structure are capable of relative rotation, and the thrust structure and the eccentric structure constitute a first sliding friction pair. The eccentric structure and the thrust structure are both located in the housing, and the space in the housing where the eccentric structure and the thrust structure are located is also used to fill water or an aqueous solution, so that the water or the aqueous solution can enter the first sliding friction pair in the housing. When the eccentric structure rotates, the thrust structure , rolling on the contact surface while contacting the contact surface of the plunger,The plunger can be pushed to move within the plunger chamber to apply pressure to the water or aqueous solution, and the plunger moves within the plunger chamber due to the repulsive force of the repulsive structure to suck in the water or aqueous solution.

[0010] Preferably, the outer edge curve of the cross section of the thrust structure perpendicular to the axis of the main shaft includes a first curve and a second curve, and the perpendicular distance from a point on the first curve to the axis of the main shaft gradually increases from one end of the first curve to the other end of the first curve, and the perpendicular distance from a point on the second curve to the axis of the main shaft gradually decreases from one end of the second curve connected to the other end of the first curve to the other end of the second curve connected to the one end of the first curve.

[0011] Preferably, the outer surface of the eccentric structure and / or the inner surface of the thrust structure is provided with a first anti-friction layer, said first anti-friction layer being made of plastic.

[0012] Preferably, the plunger includes a plunger body, one end of which is inserted into the plunger chamber, the plunger body and the plunger chamber forming a second friction pair, a second anti-friction layer fixed to an outer surface of the plunger body and / or an inner surface of the plunger chamber, and the second anti-friction layer made of plastic.

[0013] Preferably, the water or aqueous solution lubricated high pressure water pump comprises at least two of the thrust structures; the at least one plunger includes at least two plungers; The aforementioned At least two Thrust structure and At least two The plungers correspond one-to-one, before Note At least two The plungers are all located on the same side of the main shaft.

[0014] Preferably, the eccentric structure includes a main body and a socket structure fitted onto the main body, with a gap provided between the socket structure and the main body.

[0015] Preferably, the socket structure includes at least two successively mating socket bodies, the innermost socket body being fitted onto the main body, a gap being provided between the innermost socket body and the main body, and adjacent socket bodies being fitted onto the main body. body A gap is provided between the

[0016] Preferably, the thrust structure includes at least two thrust bodies that are fitted in sequence, the innermost thrust body being fitted onto the eccentric structure, a gap being provided between the innermost thrust body and the eccentric structure, and a gap being provided between adjacent thrust bodies.

[0017] Preferably, the high-pressure water pump lubricated by water or an aqueous solution further includes a tappet chamber, the plunger includes a plunger body and a tappet, the tappet is slidable within the tappet chamber, the tappet and the tappet chamber form a third friction pair, and a third anti-friction layer is fixed to an outer surface of the tappet and / or an inner surface of the tappet chamber, the third anti-friction layer being made of plastic. The thrust structure pushes the tappet to move within the tappet chamber so as to apply pressure to the water or aqueous solution, and transmits the force of the thrust structure to the plunger body via the tappet to move the plunger body within the plunger chamber.

[0018] Preferably, the plunger further includes a first plunger body provided at one end of the plunger body, the first plunger body contacting the thrust structure, and the first plunger body and the plunger body being made of different materials. [Effects of the Invention]

[0019] The present invention has the following technical advantages over the prior art.

[0020] The drive mechanism of the present invention does not include a hydrostatic support, DriveThe first friction pair of the dynamic mechanism reduces friction mainly through the lubricating effect of the fluid dynamic pressure generated by the relative rotation between the eccentric structure and the thrust structure, and the low-friction rolling contact between the thrust structure and the plunger pushes the plunger to pressurize the water or aqueous solution. These key structures are easy to implement and eliminate flow loss, allowing the high-pressure water pump to achieve higher pressure and volumetric efficiency, and significantly improves pollution resistance. [Brief explanation of the drawings]

[0021] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the embodiments. Needless to say, the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative work. [Figure 1] 1 is a schematic diagram of the internal structure of a high-pressure water pump lubricated with water or an aqueous solution according to the present invention (Example 1). [Figure 2] 1 is a schematic diagram of a drive mechanism according to the present invention (Example 1); [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 (Example 1). [Figure 4] FIG. 10 is a schematic diagram of a drive mechanism according to the present invention (Example 2). [Figure 5] FIG. 5 is a cross-sectional view taken along line BB in FIG. 4 (Example 2). [Figure 6] FIG. 10 is a schematic diagram of an eccentric structure according to the present invention (Example 3). [Figure 7] FIG. 10 is a schematic diagram of a thrust structure according to the present invention (Example 4). [Figure 8] FIG. 10 is a cross-sectional view of a high-pressure water pump lubricated with water or an aqueous solution according to the present invention (Example 5). [Figure 9] FIG. 10 is a cross-sectional view of a high-pressure water pump lubricated with water or an aqueous solution according to the present invention (Example 6). [Figure 10] FIG. 10 is a cross-sectional view of a high-pressure water pump lubricated with water or an aqueous solution according to the present invention (Example 7). DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the technical solutions according to the embodiments of the present invention will be described clearly and completely with reference to the drawings according to the embodiments of the present invention. It goes without saying that the described embodiments are only some of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without any creative work fall within the scope of protection of the present invention.

[0023] The object of the present invention is to provide a high-pressure water pump lubricated with water or an aqueous solution, which can solve the problems of conventional water-lubricated high-pressure water pumps, such as their susceptibility to damage by contaminants and their low pressure output, and which has a simple structure.

[0024] In order to make the above objects, features and advantages of the present invention more apparent, the present invention will be described in more detail below with reference to the drawings and specific embodiments.

[0025] [Example 1] As shown in FIGS. 1 to 3, the high-pressure water pump 100 lubricated by water or an aqueous solution according to this embodiment includes a drive mechanism 4, a housing 2, a rebound structure 9, a hydraulic cylinder 1, at least one plunger 43, and At least one plunger 43 has a one-to-one correspondence with at least one The hydraulic cylinder 1 includes a plunger chamber 12. The hydraulic cylinder 1, also known as a pump head, functions similarly to the hydraulic cylinder of a conventional reciprocating pump and is one of the main components of the pump that receives hydraulic pressure. High and low pressure fluid passages and a check valve 37 are arranged within the hydraulic cylinder 1, and one plunger 43 corresponds to one suction valve and one discharge valve to distribute the fluid, allowing low-pressure water to be input and high-pressure water to be output. The plunger chamber 12 may be provided in the hydraulic cylinder 1 or the housing 2. The hydraulic cylinder 1 may be molded as a single unit or may be formed by combining multiple components. The housing 2 is fixedly connected to the right end of the hydraulic cylinder 1, and the hydraulic cylinder 1 and the housing 2 may be detachably connected or manufactured as a single unit. The housing 2 may also be formed by combining multiple components and fixing them together. The housing 2 may be formed with a housing water inlet 41, and the hydraulic cylinder 1 may be formed with a cylinder water inlet . The drive mechanism 4 includes a main shaft 5 and a , which correspond one-to-one to at least one plunger 43 The thrust structure 7 includes at least one eccentric structure. In this embodiment, the eccentric structure is a cam 6, preferably in the form of an eccentric wheel. A thrust structure 7 is fitted onto the outside of each cam 6, and the thrust structure 7 and the cam 6 are relatively rotatable, forming a first sliding friction pair. The outer curve of the cross section of the thrust structure 7 perpendicular to the axis of the main shaft 5 includes a first curve 44 and a second curve 45. The perpendicular distance from a point on the first curve 44 to the axis of the main shaft 5 gradually increases from one end of the first curve 44 to the other end of the first curve 44, and the perpendicular distance from a point on the second curve 45 to the axis of the main shaft 5 gradually decreases from one end of the second curve 45 connected to the other end of the first curve 44 to the other end of the second curve 45 connected to the one end of the first curve 44.

[0026] The cam 6 and the thrust structure 7 are both located in the housing 2, and the space in the housing where the cam 6 and the thrust structure 7 are located is also used to fill water or an aqueous solution, and when the water or aqueous solution enters the housing 2, the first sliding friction pair can be improved in lubrication and heat dissipation by the water or aqueous solution. Each plunger 43 has its left end located in the hydraulic cylinder 1 and its right end in contact with the thrust structure 7, and the plunger 43 is provided with a rebound structure 9. One end of the main shaft 5 is connected to a power device (e.g., a motor), and when the main shaft 5 rotates the cam 6, the thrust structure 7 rolls on the contact surface of the plunger 43 while abutting on the contact surface of the plunger 43. the law of nature The contact causes the plunger 43 to move in the plunger chamber 12 of the hydraulic cylinder 1 toward the hydraulic cylinder 1, thereby pressurizing the water or aqueous solution and expelling the water. The action of the repulsion structure 9 also ensures that the plunger 43 maintains contact with the thrust structure 7 on the return stroke and sucks in water.

[0027] In this embodiment, a first anti-friction layer 8 is provided on the outer surface of the cam 6 and / or the inner surface of the thrust structure 7. Specifically, the first anti-friction layer 8 may be fixed to the cam 6 or the thrust structure 7 by adhesive bonding or interference fitting, or may be directly molded onto the surface by a process such as injection molding or spraying. Water or an aqueous solution enters the first sliding friction pair to provide a hydrodynamic lubrication effect.

[0028] The first anti-friction layer 8 is made of plastic, preferably a thermoplastic material such as polyetheretherketone, polyphenylene sulfide, polyamide, polyarylether, etc. The addition of fiber, graphite, polytetrafluoroethylene, etc. to the plastic can effectively improve friction performance.

[0029] In this embodiment, the cam 6 and the main shaft 5 may be manufactured as a single unit or as separate components that are then assembled and fixed, allowing the cam 6 and the main shaft 5 to rotate simultaneously. Each thrust structure 7 is fitted onto each cam 6. In this embodiment, three cams 6 are mounted on the main shaft 5, and each cam 6 presses one plunger 43 to pressurize the water or aqueous solution. In terms of rotation, the three cams 6 are 120 degrees out of phase with each other. When each thrust structure 7 presses only one plunger 43, the friction between the thrust structure 7 and the plunger 43 is primarily rolling friction. However, when each thrust structure 7 presses multiple plungers 43, the friction between the thrust structure 7 and the plungers 43 may primarily sliding friction. Because lubrication is poor in water environments, adopting a one-to-one correspondence between the thrust structures 7 and the plungers 43 is highly beneficial for reducing friction and wear in the power system and improving the structural lifespan.

[0030] Furthermore, by arranging all of the plunger bodies 3 on the same side of the main shaft 5, the structure can be simplified and manufacturing can be facilitated.

[0031] In this embodiment, the rebound structure 9 includes a first baffle plate 10 and a first elastic element 11, the first baffle plate 10 is fixed to the right end of the plunger body 3, and the first elastic element 11 has one end abutting the hydraulic cylinder 1 and the other end abutting the first baffle plate 10.

[0032] The plunger 43 may be formed by a single component or a combination of multiple components. In this embodiment, the plunger 43 includes a plunger body 3. One end of the plunger body 3 is inserted into the plunger chamber 12 of the hydraulic cylinder 1. The plunger body 3 and the plunger chamber 12 form a second friction pair, with a gap of 1 μm to 30 μm between them. The gap ensures smooth movement of the plunger body 3 within the plunger chamber 12 and prevents high-pressure fluid from leaking to the low-pressure end. Water or an aqueous solution is placed in the gap to lubricate the friction pair and release frictional heat.

[0033] In this embodiment, a second anti-friction layer 13 is fixed to the outer surface of the plunger body 3 and / or the inner surface of the plunger chamber 12. The second anti-friction layer 13 is made of plastic, preferably a thermoplastic material such as polyetheretherketone, polyphenylene sulfide, polyamide, or polyarylether. Adding fiber, graphite, polytetrafluoroethylene, or the like to the plastic can effectively improve friction performance.

[0034] In this embodiment, the second anti-friction layer 13 may be fixed to the outer surface of the plunger body 3 or the inner surface of the plunger chamber 12 by adhesive bonding or interference fitting, or may be directly molded onto the surface of the second friction pair by a process such as injection molding or spraying.

[0035] In this embodiment, the drive mechanism 4 is rotatably connected within the housing 2 by means of bearings 29 .

[0036] This embodiment has a simple structure, does not require lubricating oil, is easy to maintain, and can achieve a pressure output of over 30 MPa.

[0037] [Example 2] 4 and 5, this embodiment differs from embodiment 1 in the following respects: In this embodiment, the eccentric structure 32 is a crankshaft, all of the connecting rod journals 35 are connected to the main shaft 5 via cranks 36, the thrust structure 7 is fitted onto the outer periphery of the connecting rod journals 35, and the first anti-friction layer 8 is provided on the outer surface of the connecting rod journals 35 and / or the inner surface of the thrust structure 7.

[0038] [Example 3] As shown in Fig. 6, this embodiment differs from the first embodiment in the following respects. In this embodiment, the eccentric structure 32 includes a main body 33 and a socket structure 34 fitted onto the main body 33, with a gap provided between the socket structure 34 and the main body 33. The thrust structure 7 is fitted onto the outside of the socket structure 34, and the first anti-friction layer 8 is provided on the outer surface of the socket structure 34 and / or the inner surface of the thrust structure 7. The thrust structure 7 and the socket structure 34 are rotatable relative to each other.

[0039] The socket structure 34 consists of at least two successively fitted socket bodies 47, the innermost socket body 47 being fitted onto the main body 33 with a gap between the innermost socket body 47 and the main body 33, and there may also be a gap between adjacent socket bodies 47.

[0040] [Example 4] As shown in Fig. 7, this embodiment differs from the first embodiment in the following respects: the thrust structure 7 includes at least two thrust bodies 38 fitted sequentially, the innermost thrust body 38 fitted onto the eccentric structure 32, a gap being provided between the innermost thrust body 38 and the eccentric structure 32, and a gap being provided between adjacent thrust bodies 38. A first anti-friction layer 8 is provided on the outer surface of the eccentric structure 32 and / or the inner surface of the innermost thrust body 38.

[0041] [Example 5] In Example 1, as the thrust structure 7 pushes the plunger body 3 to move it leftward, the contact point between the thrust structure 7 and the plunger body 3 and the force it receives varies depending on the rotation angle. When the contact point is not at the center of the plunger body 3, a bending moment load is applied to the plunger body 3, and the farther away from the center, the greater the bending moment load. As the pressure of the pump output fluid increases, the bending moment received by the plunger body 3 becomes more severe, significantly increasing the stress on the second friction pair, and there is a risk that the second friction pair will quickly fail. Furthermore, by introducing a tappet 49 with a larger diameter to bear the majority of the bending moment load, the bending moment load borne by the plunger 43 is significantly reduced, effectively resolving the above problem and further increasing the output pressure of the water pump.

[0042] As shown in FIG. 8 , this embodiment differs from the first embodiment in the following respects. In this embodiment, a plunger 43 includes a plunger body 3 and a tappet 49. The tappet 49 in this embodiment is the first tappet 14, and a ball stud 17 is provided between the plunger body 3 and the first tappet 14. A first ball head 18 at one end of the ball stud 17 is provided in a first ball socket 19 of the plunger body 3, and an anti-friction coating is provided on the first ball head 18 and / or the first ball socket 19. A second ball head 20 at the other end of the ball stud 17 is provided in a second ball socket 21 of the first tappet 14, and an anti-friction coating is provided on the second ball head 20 and / or the second ball socket 21. The first ball head 18 and the second ball head 20 can rotate within the first ball socket 19 and the second ball socket 21, respectively.

[0043] The right end of the first tappet 14 abuts against the thrust structure 7 and is slidable within the hydraulic cylinder 1 or a tappet chamber 48 in the housing 2, which in this embodiment is the first tappet chamber 15. The first tappet 14 and the first tappet chamber 15 form a third friction pair, and a third anti-friction layer 16 is fixed to the outer surface of the first tappet 14 and / or the inner surface of the first tappet chamber 15. When the thrust structure 7 pushes the first tappet 14 toward the hydraulic cylinder 1, the first tappet 14 applies force to the plunger body 3 via the ball stud 17, causing the plunger body 3 to move in the plunger chamber 12 and thereby pressurizing the water or aqueous solution.

[0044] In this embodiment, the third anti-friction layer 16 is made of plastic, preferably a thermoplastic material such as polyetheretherketone, polyphenylene sulfide, polyamide, or polyarylether. Adding fiber, graphite, or polytetrafluoroethylene to the plastic can effectively improve friction performance. The third anti-friction layer may be fixed by adhesive or interference fit, or may be applied to the inner wall of the first tappet chamber 15 and / or the first tappet 14 by a process such as injection molding or spraying. outside It may be molded directly onto the surface.

[0045] In this embodiment, the rebound structure 9 includes a second baffle plate 30 fixed to one end of the first tappet 14, and a second elastic element 31. One end of the second elastic element 31 abuts against the hydraulic cylinder 1, and the other end abuts against the second baffle plate 30. The main shaft 5 drives the cam 6 to rotate. When the cam 6 rotates, the thrust structure 7 contacts and pushes the first tappet 14, moving it toward the hydraulic cylinder 1. The action of the rebound structure 9 ensures that the first tappet 14 always maintains contact with the thrust structure 7 during the return stroke of the first tappet 14.

[0046] In this embodiment, a groove is formed on the inner wall of the first tappet 14, and a stopper ring 39 is disposed in the groove, through which the bottom of the plunger body 3 protrudes. The protrusion of the bottom of the plunger body 3 and the first tappet 14 are restricted in position by the stopper ring 39, thereby ensuring that the plunger body 3 can move in the direction away from the hydraulic cylinder 1 following the first tappet 14 during the return stroke of the plunger 43, and that the first ball head 18 and the second ball head 20 at both ends of the ball stud 17 are held in the first ball socket 19 and the second ball socket 21, respectively.

[0047] In this embodiment, the plunger body 3 is mounted in the plunger chamber 12, and there is a small gap (e.g., 1 to 20 μm) between the plunger body 3 and the inner surface of the plunger chamber 12, allowing the plunger body 3 to move back and forth within the plunger chamber 12. When the plunger body 3 moves away from the hydraulic cylinder 1, it sucks in fluid. When the plunger body 3 moves toward the hydraulic cylinder 1, it pressurizes and discharges the fluid. The outer surface of the plunger body 3 and the inner surface of the plunger chamber 12 form a sliding friction pair. An anti-friction coating layer is provided on the outer surface of the plunger body 3 and / or the inner surface of the plunger chamber 12.

[0048] In this embodiment, the material of the anti-friction coating layer is preferably DLC (diamond-like carbon plating film), and DLC material has good anti-friction effect.

[0049] In this embodiment, as the thrust structure 7 pushes the first tappet 14 to move it leftward, the contact point between the thrust structure 7 and the first tappet 14 and the force it receives varies depending on the rotation angle. When the contact point is not at the center of the first tappet 14, a bending moment load is applied to the first tappet 14, and the bending moment load increases as the contact point moves away from the center. In this embodiment, the first tappet 14 bears most of the bending moment load, resulting in microscopic deformation. The ball stud 17 is used to compensate for the deformation of the first tappet 14 due to the load and for non-concentricity between the first tappet 14 and the plunger body 3 due to machining and assembly errors. When fluid is pressurized, the force applied by the ball stud 17 to the plunger body 3 is mainly a thrust force along the axis of the plunger body 3, significantly reducing the bending load and the friction between the plunger 43 and the plunger chamber 12, ensuring the long life of the plunger body 3.

[0050] In this embodiment, a friction pair member with a DLC coating layer is used, but it may also be realized by directly using a member having a ceramic material or a cemented carbide material in its entirety or on its friction surface.

[0051] This embodiment has a simple structure and can achieve a pressure output exceeding 50 MPa.

[0052] [Example 6] As shown in FIG. 9, this embodiment differs from the fifth embodiment in the following respects. In this embodiment, the tappet 49 is the second tappet 22, and the tappet chamber 48 is the second tappet chamber 23. In this embodiment, one end of the plunger body 3 abuts against the inner surface of the second tappet 22, and the contact surface is an arc-shaped surface. This structure also allows the second tappet 22 to bear most of the bending load during operation, contributing to reducing the force acting between the plunger 43 and the plunger chamber 12 when the plunger body 3 and the second tappet 22 are not coaxial. An anti-friction coating layer is provided on the right end surface of the plunger body 3 and / or the inner surface of the second tappet 22.

[0053] In this embodiment, the repulsion structure 9 includes a third elastic element 25 fitted onto the outside of the plunger body 3, one end of the third elastic element 25 abutting against the hydraulic cylinder 1 and the other end abutting against a boss 26 at one end of the plunger body 3. The plunger body 3 is pressed against the inner surface of the second tappet 22 via the third elastic element 25.

[0054] As in the fifth embodiment, the outer surface of the plunger body 3 and / or the inner surface of the plunger chamber 12 are provided with an anti-friction coating layer.

[0055] The material of the anti-friction layer is preferably DLC (diamond-like carbon plating film).

[0056] As in Example 5, a friction pair member with a DLC coating layer was used, but this may also be achieved by directly using a member having a ceramic material or a cemented carbide material in its entirety or on its friction surface.

[0057] As in the fifth embodiment, a third anti-friction layer 16 of the same material is fixed to the outer surface of the second tappet 22 and / or to the inner surface of the second tappet chamber 23 .

[0058] [Example 7] As shown in FIG. 10 , this embodiment differs from the first embodiment in the following respects. In this embodiment, the plunger 43 is formed by assembling individual components and further includes a first plunger body 40. The first plunger body 40 in this embodiment is a wear plate connected to the right end of the plunger body 3, which is located in the plunger chamber 12 and provides a pressurizing function in the plunger chamber 12. The wear plate contacts the thrust structure 7 and transmits the force applied to the wear plate from the thrust structure 7 to the plunger body 3. The plunger body 3 and the wear plate are formed of different materials. The wear plate is made of a material with relatively high hardness that can withstand frictional wear and contact fatigue, such as ceramic, hard alloy, martensitic stainless steel, or high-nitrogen stainless steel.

[0059] Although the present specification uses specific examples to describe the principles and embodiments of the present invention, the explanations of the above examples are merely intended to facilitate understanding of the method of the present invention and its core idea. Furthermore, a person skilled in the art may make partial changes to any of the specific embodiments and application scope based on the idea of ​​the present invention. Therefore, the description in the specification should not be understood as limiting the present invention. [Explanation of symbols]

[0060] 100 High-pressure water pump lubricated with water or aqueous solution 1 hydraulic cylinder 2. Housing 3 Plunger body 4. Drive mechanism 5 main axis 6 Cam 7 Thrust structure 8 First anti-friction layer 9. Rebound structure 10. First baffle plate 11 First elastic element 12 plunger chamber 13 Second anti-friction layer 14 No. 1 tappet 15 First tappet chamber 16 Third anti-friction layer 17 Ball Studs 18 First ball head 19 First ball socket 20 Second ball head 21 Second ball socket 22 No. 2 tappet 23 Second tappet chamber 25 Third elastic element 26 Boss 29 Bearings 30 Second baffle plate 31 second elastic element 32 Eccentric structure 33 Main Unit 34 Socket structure 35 Connecting Rod Journal 36 Crank 37 Check valve 38 Thrust body 39 Stopper Ring 40 First plunger body 41 Housing water inlet 42 Cylinder water inlet 43 Plunger 44 First curve 45 Second curve 47 Socket body 48 Tappet chamber 49 Tappet

Claims

1. A high-pressure water pump lubricated with water or an aqueous solution, a drive mechanism that does not include a hydrostatic support, a housing, a rebound structure, at least one plunger, and at least one plunger chamber that corresponds one-to-one to the at least one plunger; the drive mechanism includes a main shaft and at least one eccentric structure provided on the main shaft and corresponding one-to-one to the at least one plunger, a thrust structure fitted onto the outside of each of the eccentric structures, the thrust structure and the eccentric structure being rotatable relative to each other, the thrust structure and the eccentric structure constituting a first sliding friction pair, and friction being reduced by a dynamic pressure lubrication effect due to the relative rotation between the eccentric structure and the thrust structure; the eccentric structure and the thrust structure are both located in the housing, and a space in the housing where the eccentric structure and the thrust structure are located is used to fill water or an aqueous solution, so that the water or the aqueous solution can enter the first sliding friction pair in the housing; When the eccentric structure rotates, the thrust structure rolls on the contact surface of the plunger while abutting the contact surface of the plunger so that the thrust structure and the plunger are in rolling contact with each other, thereby pushing the plunger to move in the plunger chamber and realizing pressurization of the water or aqueous solution; The plunger moves in the plunger chamber by the repulsive force of the repulsive structure to suck in water or an aqueous solution; the eccentric structure is a cam, and a first anti-friction layer is provided on an outer surface of the cam and / or an inner surface of the thrust structure, and the first anti-friction layer is made of plastic; A high-pressure water pump lubricated with water or an aqueous solution.

2. The outer edge curve of the cross section of the thrust structure perpendicular to the axis of the main shaft includes a first curve and a second curve, and the perpendicular distance from a point on the first curve to the axis of the main shaft gradually increases from one end of the first curve to the other end of the first curve, and the perpendicular distance from a point on the second curve to the axis of the main shaft gradually decreases from one end of the second curve connected to the other end of the first curve to the other end of the second curve connected to the one end of the first curve.

2. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

3. The plunger includes a plunger body, one end of the plunger body is inserted into the plunger chamber, the plunger body and the plunger chamber form a second friction pair, and a second anti-friction layer is fixed to an outer surface of the plunger body and / or an inner surface of the plunger chamber; The second anti-friction layer is made of plastic.

2. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

4. The high-pressure water pump lubricated with water or an aqueous solution includes at least two of the thrust structures, the at least one plunger includes at least two plungers, the at least two thrust structures and the at least two plungers correspond one-to-one, and the at least two plungers are all located on the same side of the main shaft.

4. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

5. The eccentric structure includes a main body and a socket structure fitted onto the main body, and a gap is provided between the socket structure and the main body.

4. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

6. The socket structure includes at least two sequentially mating socket bodies, the innermost socket body being fitted onto the main body, a gap being provided between the innermost socket body and the main body, and a gap being provided between adjacent socket bodies.

6. A high-pressure water pump lubricated with water or an aqueous solution according to claim 5.

7. The thrust structure includes at least two thrust bodies that fit together in sequence, the innermost thrust body being fitted onto the eccentric structure, a gap being provided between the innermost thrust body and the eccentric structure, and a gap being provided between adjacent thrust bodies.

4. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

8. a tappet chamber, the plunger including a plunger body and a tappet, the tappet being slidable within the tappet chamber, the tappet and the tappet chamber forming a third friction pair, a third anti-friction layer fixed to an outer surface of the tappet and / or an inner surface of the tappet chamber, the third anti-friction layer being made of plastic; the thrust structure pushes the tappet to move within the tappet chamber so as to create pressure on the water or aqueous solution, and thus the tappet transmits the force of the thrust structure to the plunger body, causing the plunger body to move within the plunger chamber; 3. A high-pressure water pump lubricated with water or an aqueous solution according to claim 1.

9. The plunger further includes a first plunger body provided at one end of the plunger body, the first plunger body contacting the thrust structure, and the first plunger body and the plunger body being made of different materials.

4. A high-pressure water pump lubricated with water or an aqueous solution according to claim 3.

Images