A high pressure water pump based on water or aqueous solution lubrication

Abstract

This utility model relates to the field of high-pressure water pump technology, specifically to a high-pressure water pump lubricated by water or aqueous solution. The high-pressure water pump provided by this utility model features a thrust ring made of stainless steel and a friction-reducing layer made of plastic. The friction-reducing layer is fitted onto the inner circumferential surface of the thrust ring, or onto the outer circumferential surface of the eccentric wheel. When the friction-reducing layer is fitted onto the inner circumferential surface of the thrust ring, a groove is formed on the outer circumferential surface of the friction-reducing layer. An adhesive is applied to the inner circumferential surface of the thrust ring and / or the outer surface of the friction-reducing layer to fit it onto the inner circumferential surface of the thrust ring. The structural method and manufacturing process for fixing the friction-reducing layer are simple, ensuring reliable fixation between the friction-reducing layer and the thrust ring or eccentric wheel, preventing the friction-reducing layer from detaching from the thrust ring or eccentric wheel during high-pressure water pump operation.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure water pump technology, specifically to a high-pressure water pump based on water or aqueous solution lubrication. Background Technology

[0002] Water-lubricated high-pressure water pump drive mechanisms use water or aqueous solutions for lubrication, eliminating the need for lubricating oil. This offers advantages such as environmental friendliness and maintenance-free operation, making it an ideal green power source. As shown in patent EP4455482A1, the newly developed water-lubricated high-pressure water pump employs an eccentric wheel shaft and a thrust ring fitted on the outer circumference of the eccentric wheel as the drive mechanism. When the eccentric wheel shaft rotates, the eccentric wheel and the thrust ring also rotate relative to each other. The outer circumference of the thrust ring abuts against the piston end face, forming a rolling friction pair that drives the piston to reciprocate within the piston cavity, thus pressurizing the water or aqueous solution.

[0003] The thrust ring plays a crucial role in converting the rotational motion of the eccentric wheel into the reciprocating motion of the plunger. To ensure the efficient operation of the water pump, stimulate the hydrodynamic lubrication effect, and reduce friction and wear, a friction-reducing layer of plastic material is fixed on the inner circumferential surface of the thrust ring or the outer circumferential surface of the eccentric wheel. In actual operation, the thrust ring and eccentric wheel bear heavy loads and significant vibrations. Furthermore, there is also slight sliding motion between the thrust ring and eccentric wheel along the axial direction, meaning the friction-reducing layer also bears forces along the eccentric wheel's axis. If the friction-reducing layer is not reliably fixed to the thrust ring or eccentric wheel, it will detach, leading to pump failure.

[0004] The inventors have attempted to strengthen the connection between the plastic friction-reducing layer and the thrust ring or eccentric wheel using various methods, such as interference fits and adhesive bonding. Traditional adhesive bonding methods require the adhesive to have good bonding properties with the mating materials being bonded. Due to the difficulty in bonding commonly used friction-reducing layer materials such as polyetheretherketone (PEEK), it is currently impossible to reliably fix PEEK and other friction-reducing layer materials to the outer circumference of the eccentric wheel or the inner circumference of the thrust ring using traditional adhesive bonding methods. Moreover, because the plastic friction-reducing layer is soft, it is difficult to ensure the reliability of its fixation even using interference fits or similar methods.

[0005] Patent WO9416216A discloses a method for fixing a bushing in the cylinder bore of a hydraulic component. Grooves are machined into the outer wall of the bushing and the inner wall of the cylinder bore, with the grooves on the outer wall coinciding with those on the inner wall. A locking element, such as adhesive, is injected into the groove space formed by the inner and outer wall grooves through a flow channel connecting to the outside. After the adhesive cures, it fills the groove formed by the inner and outer wall grooves, thereby fixing the bushing in the cylinder bore. Regarding the fixing of a plastic friction-reducing layer on a thrust ring, the thrust ring is a thin-walled part, making it difficult to create a flow channel connecting to the outside. Furthermore, such a flow channel would severely reduce the mechanical properties of the thrust ring, such as fatigue strength. Creating grooves within the thrust ring also increases the part size, and the entire injection and assembly process is relatively complex. Additionally, fixing the plastic friction-reducing layer to an eccentric wheel, creating corresponding inner and outer wall grooves, and setting up a flow channel connecting to the outside before injection is equally complex.

[0006] Patent US005722312A proposes a method to fix the bushing within the cylinder bore and prevent it from coming off by locally heating its edges to expand and shape them. However, due to the relatively large inner diameter of the thrust ring and the soft texture of the plastic friction-reducing layer, relying solely on the deformation of the plastic friction-reducing layer to prevent bushing dislodgement is unreliable under harsh working conditions where the thrust ring is subjected to heavy loads, and the plastic friction-reducing layer is at risk of coming off.

[0007] To ensure the reliable fixation of the plastic friction-reducing layer, new solutions are urgently needed. Utility Model Content

[0008] (I) The problem to be solved by this utility model is: how to ensure reliable fixation between the friction-reducing layer and the thrust ring or the eccentric wheel, and prevent the friction-reducing layer from coming off the thrust ring or the eccentric wheel during the operation of the high-pressure water pump.

[0009] (II) Technical Solution

[0010] A high-pressure water pump based on water or aqueous solution lubrication includes a cylinder body, a housing, a plunger hole, a plunger, and a drive structure; the plunger can reciprocate within a corresponding plunger hole; the cylinder body is provided with an inlet check valve and an outlet check valve; the drive structure includes an eccentric wheel shaft and a thrust ring; the eccentric wheel shaft includes a main shaft and an eccentric wheel mounted on the main shaft, the eccentric wheel being a stainless steel eccentric wheel; the thrust ring is sleeved on the outer circumference of each eccentric wheel, and the thrust ring and the eccentric wheel can rotate relative to each other;

[0011] The internal space formed after the cylinder body and the housing are connected is a receiving space, and the thrust ring is provided in the receiving space. The receiving space is also used to fill water or aqueous solution.

[0012] The thrust ring is a stainless steel ring, and the friction-reducing layer is a plastic ring.

[0013] The friction-reducing layer is sleeved on the inner circumferential surface of the thrust ring, or the friction-reducing layer is sleeved on the outer circumferential surface of the eccentric wheel.

[0014] When the friction-reducing layer is fitted into the inner circumferential surface of the thrust ring, and a groove is formed on the outer circumferential surface of the friction-reducing layer, an adhesive is applied to the inner circumferential surface of the thrust ring and / or the outer surface of the friction-reducing layer, and the friction-reducing layer is fitted into the inner circumferential surface of the thrust ring. After the adhesive is cured, it fills the groove and adheres to the inner surface of the thrust ring.

[0015] When the friction-reducing layer is fitted onto the outer circumferential surface of the eccentric wheel, a groove is formed on the inner circumferential surface of the friction-reducing layer. By applying adhesive to the outer circumferential surface of the eccentric wheel and / or the inner surface of the friction-reducing layer and fitting the friction-reducing layer onto the outer circumferential surface of the eccentric wheel, the adhesive is cured and fills the groove and bonds to the outer circumferential surface of the eccentric wheel.

[0016] According to one embodiment of the present invention, the groove includes an annular groove, which is coaxially arranged with the friction-reducing layer.

[0017] According to one embodiment of the present invention, the groove is a strip-shaped groove that extends along the axial direction of the friction-reducing layer.

[0018] According to one embodiment of the present invention, the groove is spirally coiled on the surface of the friction-reducing layer.

[0019] According to one embodiment of the present invention, the depth of the groove is 0.05mm-1mm.

[0020] According to one embodiment of the present invention, the adhesive is an epoxy resin.

[0021] According to one embodiment of the present invention, the friction-reducing layer is a thermoplastic material.

[0022] The beneficial effects of this utility model are:

[0023] For fixing the plastic friction-reducing layer and the thrust ring, this invention only creates grooves on the outer circumferential surface of the plastic friction-reducing layer, which has poor adhesive properties, while the inner circumferential surface of the stainless steel thrust ring, which has good adhesive properties, does not require grooves. After applying adhesive to the outer circumferential surface of the friction-reducing layer and / or the inner circumferential surface of the thrust ring, the friction-reducing layer and the thrust ring are press-fitted and bonded together using conventional adhesive processes, without the need to create flow channels to the outside and introduce adhesive. The fixing of the plastic friction-reducing layer and the eccentric wheel can also be implemented in the same way.

[0024] The structure and process of the fixed friction-reducing layer adopted in this utility model are simple and can ensure reliable fixation between the friction-reducing layer and the thrust ring or eccentric wheel, preventing the friction-reducing layer from coming off the thrust ring or eccentric wheel during the operation of the high-pressure water pump. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a high-pressure water pump based on water or aqueous solution lubrication provided for an embodiment of this utility model;

[0027] Figure 2 A schematic diagram showing the friction-reducing layer fixed to the inner circumferential surface of the thrust ring according to an embodiment of this utility model;

[0028] Figure 3 This is a schematic diagram showing the friction-reducing layer fixed to the outer circumferential surface of the eccentric wheel according to an embodiment of the present invention.

[0029] Icons: 1. Housing; 2. Cylinder body; 3. Plunger cavity; 301. Plunger bore; 4. Plunger; 5. Main shaft; 6. Eccentric wheel; 7. Thrust ring; 8. Spring; 9. Spring bracket; 10. Outlet check valve; 11. Inlet check valve; 12. Accommodation space; 13. Anti-friction layer; 131. Groove; 14. Adhesive layer. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figures 1-3As shown, one embodiment of this utility model provides a high-pressure water pump based on water or aqueous solution lubrication, including a cylinder body 2, a housing 1, a plunger hole 301, a plunger 4, and a drive structure; the plunger 4 can reciprocate within the corresponding plunger hole 301; the cylinder body 2 is provided with an inlet check valve 11 and an outlet check valve 10; the drive structure includes an eccentric wheel shaft and a thrust ring 7; the eccentric wheel shaft includes a main shaft 5 and an eccentric wheel 6 disposed on the main shaft 5, the eccentric wheel 6 being a stainless steel eccentric wheel 6; a thrust ring 7 is sleeved on the outer circumference of each eccentric wheel 6, and the thrust ring 7 and the eccentric wheel 6 can rotate relative to each other;

[0032] The internal space formed after the hydraulic cylinder 2 and the housing 1 are connected is the accommodating space 12. A thrust ring 7 is provided in the accommodating space 12. The accommodating space 12 is also used to fill water or aqueous solution.

[0033] The thrust ring 7 is a stainless steel ring, and the friction-reducing layer 13 is a plastic ring;

[0034] The friction-reducing layer 13 is sleeved on the inner circumferential surface of the thrust ring 7, or the friction-reducing layer 13 is sleeved on the outer circumferential surface of the eccentric wheel 6.

[0035] When the friction-reducing layer 13 is fitted into the inner circumferential surface of the thrust ring 7, and a groove 131 is formed on the outer circumferential surface of the friction-reducing layer 13, an adhesive is applied to the inner circumferential surface of the thrust ring 7 and / or the outer surface of the friction-reducing layer 13, and the friction-reducing layer 13 is fitted into the inner circumferential surface of the thrust ring 7. After the adhesive cures, it fills the groove 131 and bonds with the inner surface of the thrust ring 7. Through the limiting effect of the adhesive on the friction-reducing layer 13, the friction-reducing layer 13 is fixedly connected to the thrust ring 7.

[0036] When the friction-reducing layer 13 is sleeved on the outer circumferential surface of the eccentric wheel 6, a groove 131 is formed on the inner circumferential surface of the friction-reducing layer 13. By applying adhesive to the outer circumferential surface of the eccentric wheel 6 and / or the inner surface of the friction-reducing layer 13 and sleeved on the outer circumferential surface of the eccentric wheel 6, the adhesive is cured and filled into the groove 131 and bonded to the outer circumferential surface of the eccentric wheel 6. The friction-reducing layer 13 is fixedly connected to the eccentric wheel 6 by the limiting effect of the adhesive on the friction-reducing layer 13.

[0037] It should be noted that, as Figure 1 As shown, the drive mechanism includes an eccentric wheel shaft and a thrust ring 7. An eccentric wheel 6 is provided on the eccentric wheel shaft, and a thrust ring 7 corresponding to the eccentric wheel 6 is provided on the eccentric wheel 6. The thrust ring 7 is circular in shape, and the inner circumferential surface of the thrust ring 7 is fitted onto the outer circumferential surface of the eccentric wheel 6. The thrust ring 7 and the eccentric wheel 6 are rotatably connected.

[0038] In some embodiments, the plunger cavity 3 is connected to the hydraulic cylinder 2, or the plunger cavity 3 and the hydraulic cylinder 2 are integrally molded structures (i.e., the main body materials are continuous), and the plunger cavity 3 is provided with a plunger hole 301, in which the plunger 4 can slide back and forth.

[0039] The cylinder body 2 and the housing 1 are fixedly connected. The internal space formed by the connection of the cylinder body 2 and the housing 1 is the receiving space 12. The eccentric wheel 6 and the thrust ring 7 are located in the receiving space 12. The receiving space 12 is also used to fill water or aqueous solution, which can lubricate and cool the drive mechanism. A spring assembly (composed of spring 8 and spring bracket 9) is also provided in the receiving space 12 to press the plunger 4 against the thrust ring 7.

[0040] When the eccentric wheel shaft rotates, as the center of the eccentric wheel 6 moves away from the hydraulic cylinder 2, the spring 8 pushes the plunger 4 away from the hydraulic cylinder 2. This increases the space within the plunger orifice 301 that can hold fluid, creating a negative pressure compared to the pump inlet. At this time, the inlet check valve 11 opens, and the outlet check valve 10 closes, allowing water or an aqueous solution to be drawn into the pump through the inlet. When the center of the eccentric wheel 6 moves closer to the hydraulic cylinder 2, the thrust ring 7 pushes the plunger 4 closer to the hydraulic cylinder 2. This reduces the space within the plunger orifice 301 that can hold fluid, increasing the fluid pressure within the orifice. Under this pressure, the inlet check valve 11 closes, and the outlet check valve 10 opens, allowing the hydraulic cylinder 2 to drain water. It is important to note that during both suction and drainage, the thrust ring 7 remains in contact with the end face of the plunger 4 and rolls back and forth on that end face. The interaction of forces between the thrust ring 7 and the plunger 4 is achieved through rolling friction contact.

[0041] The thrust ring 7 and the eccentric wheel 6 rotate relative to each other, forming a sliding friction pair. Under water medium conditions, due to the poor lubrication characteristics of water, to ensure that the sliding friction pair formed by the thrust ring 7 and the eccentric wheel 6 can better excite the hydrodynamic lubrication effect and achieve low friction coefficient and low wear operation, it is necessary to fix the anti-friction layer 13 on the inner circumferential surface of the thrust ring 7, and the anti-friction layer 13 and the outer circumferential surface of the eccentric wheel 6 will slide against each other; or it is necessary to fix the anti-friction layer 13 on the outer circumferential surface of the eccentric wheel 6, and the anti-friction layer 13 and the inner circumferential surface of the thrust ring 7 will slide against each other. However, because the sliding friction pair formed by the thrust ring 7 and the eccentric wheel 6 operates under heavy load, even for a small-power high-pressure water pump, the load on the friction pair can reach several thousand Newtons. At the same time, the high-pressure water pump vibrates significantly during operation, and there is also a small sliding motion between the friction pairs along the axial direction of the eccentric wheel shaft. That is, the anti-friction layer 13 is subjected to a force along the axial direction of the eccentric wheel shaft, which makes the anti-friction layer 13 easy to detach from the thrust ring 7 or the eccentric wheel 6, causing the water pump to fail.

[0042] Traditional bonding methods require adhesives to have good adhesion to the mating materials being bonded. Due to the difficulty in bonding, it is not possible to reliably fix friction-reducing layer materials such as polyetheretherketone to the outer circumferential surface of the stainless steel eccentric wheel 6 or the inner circumferential surface of the stainless steel thrust ring 7 using traditional bonding methods. Moreover, since the friction-reducing layer 13 made of plastic is soft, it is difficult to ensure the reliability of fixing the friction-reducing layer 13 even through methods such as interference fit.

[0043] In this embodiment, the eccentric wheel 6 and the thrust ring 7 are made of stainless steel, preferably martensitic stainless steel and precipitation hardening stainless steel. Stainless steel generally has good adhesion properties.

[0044] In this embodiment, the friction-reducing layer 13 is made of plastic, preferably a thermoplastic material, such as polyetheretherketone, polyphenylene sulfide, polyamide, polyarylether, etc. It should be noted that polyetheretherketone is usually the main material used in friction-reducing layers, but polyetheretherketone is a difficult-to-bond material.

[0045] In some embodiments, adding fibers, graphite, polytetrafluoroethylene, etc. to the plastic friction-reducing layer 13 can effectively improve tribological properties.

[0046] In this embodiment, as Figure 2 As shown, when the anti-friction layer 13 is fixed on the inner circumferential surface of the thrust ring 7:

[0047] A groove 131 is made on the outer circumferential surface of the friction-reducing layer 13. After applying adhesive to the outer surface of the friction-reducing layer 13 and / or the inner circumferential surface of the thrust ring 7, the friction-reducing layer 13 and the thrust ring 7 are pressed together to achieve reliable fixation.

[0048] The fixing principle is as follows: one side of the adhesive layer 14 is fixed to the inner surface of the thrust ring 7 by good adhesion to the stainless steel material thrust ring 7. On the other side, during the adhesive application or pressing process, the adhesive layer 14 fills the groove 131 of the friction-reducing layer 13. After curing, the adhesive layer 14 hardens. A reliable connection is achieved by the mutual embedding and limiting of the adhesive layer 14 and the friction-reducing layer 13 in the wall thickness direction of the thrust ring 7.

[0049] In some embodiments, the groove 131 formed on the outer circumferential surface of the plastic friction-reducing layer 13 is an annular groove concentric with the friction-reducing layer 13, which can prevent the friction-reducing layer 13 from coming off the thrust ring 7 axially.

[0050] In some embodiments, the grooves 131 formed on the outer circumferential surface of the plastic friction-reducing layer 13 are parallel to the axial direction of the thrust ring 7. For example, the grooves 131 are elongated grooves extending along the axial direction of the friction-reducing layer 13. Such grooves 131 can prevent the friction-reducing layer 13 and the thrust ring 7 from misaligning with each other in the circumferential direction.

[0051] In some embodiments, the grooves 131 formed on the outer circumferential surface of the plastic friction-reducing layer 13 include both annular grooves concentric with the friction-reducing layer 13 and elongated grooves parallel to the axial direction of the thrust ring 7. This prevents the friction-reducing layer 13 from detaching from the thrust ring 7 axially and also prevents the friction-reducing layer 13 and the thrust ring 7 from shifting around the circumference.

[0052] In some embodiments, the grooves 131 formed on the outer circumferential surface of the plastic friction-reducing layer 13 are similar to threads, and the threaded grooves 131 are arranged spirally around the outer circumferential surface of the friction-reducing layer 13. This can simultaneously prevent the friction-reducing layer 13 from shifting with the thrust ring 7 in all directions.

[0053] In this embodiment, the groove depth of the groove 131 is preferably 0.05mm-1mm, which can both ensure the strength requirements and save the amount of adhesive used.

[0054] To ensure the strength of the locking effect achieved by the adhesive, it is preferable to use an adhesive with good bulk strength, such as epoxy adhesive, whose bulk strength can reach tens of megapascals.

[0055] In this embodiment, as Figure 3 As shown, when the friction-reducing layer 13 is fixed to the outer circumferential surface of the eccentric wheel 6, a groove 131 is made on the inner circumferential surface of the friction-reducing layer 13. After applying adhesive to the inner surface of the friction-reducing layer 13 and / or the outer circumferential surface of the eccentric wheel 6, the friction-reducing layer 13 and the eccentric wheel 6 are press-fitted together. Reliable fixing can also be achieved after the adhesive cures. The principle of connecting and fixing the friction-reducing layer 13 and the eccentric wheel 6 by creating a groove on the inner circumferential surface of the friction-reducing layer 13 and through the bonding and limiting effect of the adhesive layer 14, as well as the structural form of the groove 131, are explained. Figure 2 The embodiment shown is the same as the one in which the friction-reducing layer 13 is fixedly connected to the inner circumferential surface of the thrust ring 7.

[0056] In summary, for fixing the plastic friction-reducing layer 13 and the thrust ring 7, this invention only creates grooves 131 on the outer circumferential surface of the plastic friction-reducing layer 13, which has poor adhesive properties, while the inner circumferential surface of the stainless steel thrust ring 7, which has good adhesive properties, does not require grooves 131. After applying adhesive to the outer surface of the friction-reducing layer 13 and / or the inner circumferential surface of the thrust ring 7, the friction-reducing layer 13 and the thrust ring 7 are press-fitted and bonded together using conventional adhesive processes, without the need to create flow channels to the outside and introduce adhesive. The fixing of the plastic friction-reducing layer 13 and the eccentric wheel 6 can also be implemented in the same way.

[0057] The present invention has a simple structure and process, which can ensure reliable fixation between the friction-reducing layer 13 and the thrust ring 7 or the eccentric wheel 6, and prevent the friction-reducing layer 13 from coming off the thrust ring 7 or the eccentric wheel 6 during the operation of the high-pressure water pump.

[0058] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-pressure water pump based on water or aqueous solution lubrication, characterized in that, The system includes a hydraulic cylinder body (2), a housing (1), a plunger hole (301), a plunger (4), and a drive structure. The plunger (4) can reciprocate within the corresponding plunger hole (301). The hydraulic cylinder body (2) is equipped with an inlet check valve (11) and an outlet check valve (10). The drive structure includes an eccentric wheel shaft and a thrust ring (7). The eccentric wheel shaft includes a main shaft (5) and an eccentric wheel (6) mounted on the main shaft (5). The eccentric wheel (6) is a stainless steel eccentric wheel. The thrust ring (7) is fitted on the outer circumference of each eccentric wheel (6), and the thrust ring (7) and the eccentric wheel (6) can rotate relative to each other. The internal space formed by the connection of the liquid cylinder (2) and the shell (1) is a receiving space (12). The thrust ring (7) is provided in the receiving space (12). The receiving space (12) is also used to fill water or aqueous solution. The thrust ring (7) is a stainless steel ring, and the friction-reducing layer (13) is a plastic ring; The friction-reducing layer (13) is sleeved on the inner circumferential surface of the thrust ring, or the friction-reducing layer (13) is sleeved on the outer circumferential surface of the eccentric wheel (6); When the friction-reducing layer (13) is fitted into the inner circumferential surface of the thrust ring, a groove (131) for accommodating adhesive is provided on the outer circumferential surface of the friction-reducing layer (13), and the adhesive is cured and filled in the groove (131) and bonded to the inner circumferential surface of the thrust ring. When the friction-reducing layer (13) is sleeved on the outer circumferential surface of the eccentric wheel (6), a groove (131) for accommodating adhesive is opened on the inner circumferential surface of the friction-reducing layer (13), and the adhesive is cured and filled in the groove (131) and bonded to the outer circumferential surface of the eccentric wheel (6).

2. A high pressure water pump lubricated with water or aqueous solution according to claim 1, characterized in that, The groove (131) includes an annular groove, which is coaxially arranged with the friction-reducing layer (13).

3. A high pressure water pump lubricated with water or aqueous solution according to claim 1, characterized in that, The groove (131) is a strip-shaped groove that extends along the axial direction of the friction-reducing layer (13).

4. A high pressure water pump lubricated with water or aqueous solution according to claim 1, characterized in that, The groove (131) is spiraled in a spiral shape on the surface of the friction-reducing layer (13).

5. A high-pressure water pump based on water or aqueous solution lubrication according to any one of claims 1-4, characterized in that, The depth of the groove (131) is 0.05mm-1mm.

6. A high pressure water pump lubricated with water or aqueous solution according to claim 1, characterized in that, The adhesive is epoxy resin.

7. A high pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The friction-reducing layer (13) is a thermoplastic material.

Images