High-pressure water pump based on water or aqueous solution lubrication

Abstract

The utility model relates to the technical field of high-pressure water pumps, in particular to a high-pressure water pump based on water or aqueous solution lubrication. The utility model provides a high-pressure water pump based on water or aqueous solution lubrication. The high-pressure water pump comprises a pump shell, a hydraulic cylinder body, a driving mechanism, at least one plunger and a plunger cavity. The hydraulic cylinder body is fixedly connected with the pump shell, an internal space formed after the hydraulic cylinder body and the pump shell are connected is a containing space, the plunger and the driving mechanism are arranged in the containing space, and the containing space is used for being filled with water or an aqueous solution at the same time; one end of the plunger extends into the plunger cavity and is matched with the plunger cavity, and the other end of the plunger is matched with the driving mechanism. According to the high-pressure water pump based on water or aqueous solution lubrication, under the condition that the strength and rigidity are met, the eccentric distance is further increased by adopting a non-circular section structural form on the sealing section of the main shaft, so that the stroke of the plunger is increased, and the output flow and the power density of the pump are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure water pumps, in particular to a high-pressure water pump based on water or aqueous solution lubrication. Background Art

[0002] Water-lubricated high-pressure water pumps are a new technology. Unlike traditional reciprocating pumps that use oil to lubricate the power end, their drive elements require no lubricant. Through a unique structural design, they require only water or an aqueous solution to lubricate the power components and maintain efficient operation. Because they require no lubricant, water-lubricated high-pressure water pumps avoid environmental pollution and offer a longer, maintenance-free lifespan. They are expected to be widely used in high-pressure cleaning, high-pressure misting, fine mist fire extinguishing, seawater desalination, high-pressure deburring, and other fields.

[0003] The water-lubricated high-pressure water pump proposed in Chinese utility model patent application number 202321748625.7 utilizes an eccentric shaft as its drive mechanism. The eccentric shaft is fitted with a thrust ring. When the eccentric shaft rotates, the thrust ring pushes the plunger to achieve pressurized output of water or aqueous solution. By employing an eccentric shaft with both an integral eccentric and a combined eccentric, the spindle's flexural resistance is significantly improved, thereby extending the pump's service life. Furthermore, the eccentric shaft and thrust ring are easily installed, resulting in a simple, compact, and lightweight structure.

[0004] In the above technical solution, the outer portions of the eccentric at either end of the main shaft are formed of cylindrical bodies. The projection plane perpendicular to the main shaft centerline of the outer portions of the main shaft falls within the projection plane perpendicular to the main shaft centerline of the outermost eccentric or the reinforcing core shaft, thereby ensuring the proper installation of the thrust ring and eccentric sleeve. As is well known, increasing the eccentric distance can increase the plunger stroke, thereby improving the pump's flow output and power density. Regarding the eccentric wheel shaft structure proposed in the Chinese utility model patent application number 202321748625.7, under the condition that the shaft diameter size remains unchanged, when the eccentric distance is increased beyond a certain limit, the contour curve of the part of the main shaft at both ends outside the eccentric wheel on the projection surface perpendicular to the center line of the main shaft will exceed the range of the contour curve of the reinforced core shaft or the eccentric wheel on the projection surface perpendicular to the center line of the main shaft; at this time, the eccentric wheel sleeve will not be able to pass through the part of the main shaft outside the eccentric wheel and thus be sleeved on the reinforced core shaft, or the thrust ring will not be able to pass through the part of the main shaft outside the eccentric wheel and thus be sleeved on the eccentric wheel, resulting in the inability to manufacture and realize the drive mechanism.

[0005] Therefore, how to further increase the eccentricity of the eccentric wheel shaft in the above-mentioned water-lubricated high-pressure water pump, increase the plunger stroke, and improve the output flow and power density of the pump while meeting the strength and stiffness conditions is a technical problem that needs to be solved urgently. Utility Model Content

[0006] (1) The problem to be solved by the present invention is: how to further increase the eccentricity of the eccentric wheel shaft in the traditional water-lubricated high-pressure water pump, increase the plunger stroke, and improve the output flow rate and power density of the pump while meeting the conditions of strength and rigidity.

[0007] (2) Technical solution

[0008] A high-pressure water pump lubricated with water or an aqueous solution comprises a pump housing, a cylinder body, a drive mechanism, at least one plunger, and a plunger cavity; the cylinder body is fixedly connected to the pump housing, and the internal space formed by the connection between the cylinder body and the pump housing is a receiving space, the plunger and the drive mechanism are disposed within the receiving space, and the receiving space is also used to be filled with water or an aqueous solution; one end of the plunger extends into the plunger cavity and engages with the plunger cavity, and the other end engages with the drive mechanism;

[0009] The driving mechanism includes an eccentric shaft and a thrust ring. The eccentric shaft includes a main shaft and a plurality of eccentrics arranged on the main shaft. Each eccentric is sleeved with a thrust ring corresponding to the eccentric for rolling contact with the plunger. Both ends of the main shaft extend outward from the outer edge of the outermost eccentric to form a main shaft sealing section.

[0010] The main shaft sealing section on at least one side of the main shaft has a cross-sectional outer contour curve perpendicular to the center line of the main shaft that is a non-circular curve, and a shaft sleeve is provided on the outer sleeve of the main shaft sealing section, and a sealing structure is provided on the outer peripheral surface of the shaft sleeve. The sealing structure and the shaft sleeve are contact-sealed to prevent water from leaking from the accommodating space.

[0011] According to one embodiment of the present invention, the eccentric wheel is an integral eccentric wheel or a combined eccentric wheel; at least the outermost eccentric wheel located at one end of the main shaft is a combined eccentric wheel, and the combined eccentric wheel includes a reinforcing core shaft and an eccentric wheel sleeve sleeved on the outer peripheral surface of the reinforcing core shaft, and the contour curve of the reinforcing core shaft in the projection surface perpendicular to the center line of the main shaft is non-circular; the contour curve of the main shaft sealing section close to the combined eccentric wheel in the projection surface perpendicular to the center line of the main shaft is non-circular, and its projection surface falls within the projection surface of the reinforcing core shaft perpendicular to the center line of the main shaft.

[0012] According to one embodiment of the present invention, the contour curve of the main shaft sealing segment on the projection surface perpendicular to the main shaft center line includes a first arc segment and a second arc segment; wherein, the second arc segment and the contour curve of the reinforcing core shaft on the projection surface perpendicular to the main shaft center line coincide with each other, and the distance between the first arc segment and the main shaft center line is greater than the distance between the second arc segment and the main shaft center line.

[0013] According to one embodiment of the present invention, the eccentric wheel includes at least one integral eccentric wheel and at least one combined eccentric wheel, and the integral eccentric wheel and the main shaft are formed of continuous material.

[0014] According to one embodiment of the present invention, a bearing support section is provided on the outside of the main shaft sealing section and extends along the axial direction of the main shaft; a portion of the shaft sleeve is sleeved on the bearing support section, and a portion is sleeved on the main shaft sealing section; the shaft sleeve and the bearing support section are connected by interference fit or adhesive bonding to achieve sealing between the shaft sleeve and the main shaft, thereby preventing water from flowing out of the accommodating space along the main shaft.

[0015] Beneficial effects of the utility model:

[0016] Under the conditions of strength and rigidity, by increasing the eccentricity of the eccentric shaft and removing the material of the main shaft sealing section corresponding to the portion outside the projected surface of the main shaft sealing section protruding from the core shaft or the projected surface of the eccentric shaft through mechanical processing, the cross section of the main shaft sealing section perpendicular to the center line of the main shaft becomes a non-circular cross section, while still ensuring the manufacture and assembly of the eccentric shaft and thrust ring structure; compared with the traditional eccentric shaft design, this method can increase the eccentricity between the main shaft and the eccentric shaft to an appropriate range. A shaft sleeve is further provided on the outer peripheral surface of the non-circular main shaft sealing section to restore its outer surface to a complete cylindrical surface. The contact seal between the sealing structure and the shaft sleeve can prevent water from leaking from the containment space. Under the premise of basically not increasing the weight and shaft diameter, this method increases the plunger stroke, improves the output flow rate and power density of the high-pressure water pump, and effectively realizes the sealing of water or aqueous solution in the containment space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A first cross-sectional view of a high-pressure water pump lubricated with water or aqueous solution provided in an embodiment of the present invention;

[0019] Figure 2 A second cross-sectional view of a high-pressure water pump lubricated with water or aqueous solution provided in an embodiment of the present invention;

[0020] Figure 3 A front view of the eccentric wheel shaft provided in an embodiment of the present utility model;

[0021] Figure 4A side view of the reinforced core shaft and the second main shaft sealing section provided in an embodiment of the present utility model.

[0022] Icons: 1. Pump casing; 101. Pump casing water inlet; 2. Liquid cylinder body; 201. Plunger chamber; 4. Plunger; 5. Spring; 6. Connecting plate; 7. Main shaft; 701. First main shaft bearing support section; 702. First main shaft sealing section; 703. Second main shaft bearing support section; 704. Second main shaft sealing section; 8. Eccentric wheel mechanism; 801. First eccentric wheel; 802. Second eccentric wheel; 803. Reinforced core shaft; 804. Eccentric wheel sleeve; 10. Thrust ring; 11. Rolling bearing; 14. Shaft sleeve; 15. Sealing structure; a. First arc segment; b. Second arc segment. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The embodiment of the present utility model provides a high-pressure water pump based on water or aqueous solution lubrication, including a pump housing 1, a liquid cylinder body 2, a driving mechanism, at least one plunger 4 and a plunger cavity 201; the liquid cylinder body 2 is fixedly connected to the pump housing 1, and the internal space formed after the liquid cylinder body 2 and the pump housing 1 are connected is a receiving space, the plunger 4 and the driving mechanism are arranged in the receiving space, and the receiving space is also used to fill water or aqueous solution; one end of the plunger 4 extends into the plunger cavity 201 and cooperates with the plunger cavity 201, and the other end cooperates with the driving mechanism; the driving mechanism includes an eccentric shaft and a thrust ring 10, the eccentric shaft It includes a main shaft 7 and several eccentric wheels arranged on the main shaft 7. Each eccentric wheel is provided with a thrust ring 10 corresponding to the eccentric wheel and used for rolling contact with the plunger 4. The two ends of the main shaft 7 extend outward from the outer edge of the outermost eccentric wheel to form a main shaft sealing section. The main shaft sealing section on at least one side of the main shaft 7 has a cross-sectional outer contour curve perpendicular to the center line of the main shaft 7 that is a non-circular curve. The main shaft sealing section is outer-circularly provided with a sleeve 14, and a sealing structure 15 is provided on the outer peripheral surface of the sleeve 14. The sealing structure 15 and the sleeve 14 are sealed by contact to prevent water from leaking from the accommodating space.

[0025] In this embodiment, if Figure 2As shown, the eccentric mechanism 8, composed of several eccentrics, includes three eccentrics mounted on the main shaft 7. The leftmost first eccentric 801 and the middle second eccentric 802 are integral eccentrics, while the rightmost eccentric is a combined eccentric. The integral eccentrics and the main shaft 7 are characterized by continuous material between components and are machined integrally from the same blank. The combined eccentrics include a reinforcing mandrel 803 integrally machined with the main shaft 7 and an eccentric sleeve 804 sleeved around the outer circumference of the reinforcing mandrel 803. The eccentric sleeve 804 is preferably secured to the outer circumference of the reinforcing mandrel 803 using an interference fit.

[0026] The spindle seal section on the left side of the main shaft 7 is designated as the first spindle seal section 702, and the spindle seal section on the right side of the main shaft 7 is designated as the second spindle seal section 704. A sealing structure 15 is provided on the outer periphery of the main shaft seal section to prevent water leakage within the containment space and to prevent water from corroding the bearings. A bearing support section is provided on the outer side of the main shaft 7, extending along the main shaft axial direction. This section is used to mount a rolling bearing 11, thereby achieving a rotational connection between the shaft and the pump housing 1. The bearing support section adjacent to the first spindle seal section 702 is the first spindle bearing support section 701, and the section adjacent to the second spindle seal section 704 is the second spindle bearing support section 703.

[0027] The manufacturing process of the drive mechanism is as follows: the thrust ring 10, the eccentric wheel sleeve 804 belonging to the combined eccentric wheel and the main shaft 7 are manufactured separately. The integral first eccentric wheel 801 and the second eccentric wheel 802, the reinforcing core shaft 803 and the main shaft 7 are an integral structure with continuous materials, and are manufactured simultaneously when the main shaft 7 is manufactured.

[0028] The assembly process of the driving mechanism is as follows: first install the thrust ring 10 corresponding to the second eccentric 802, further install the eccentric sleeve 804 of the combined eccentric, and then install the first eccentric 801 and the thrust ring 10 corresponding to the combined eccentric.

[0029] During assembly, the thrust ring 10 can be mounted on the outer peripheral surface of the second eccentric 802 after the hole of the thrust ring 10 corresponding to the second eccentric 802 passes through the second main shaft bearing support section 703, the second main shaft sealing section 704, and the reinforcing core shaft 803; in order to smoothly achieve the mounting, it is at least necessary to ensure that the contour curves of the reinforcing core shaft 803 and the second main shaft sealing section 704 on the projection surface perpendicular to the main shaft center line are surrounded by the contour curves of the second eccentric 802 on the projection surface perpendicular to the main shaft center line.

[0030] The hole of the eccentric wheel sleeve 804 of the combined eccentric wheel can pass through the second main shaft bearing support section 703 and the second main shaft sealing section 704 and then be mounted on the outer surface of the reinforced core shaft 803. At least it is necessary to ensure that the contour curve of the second main shaft sealing section 704 on the projection surface perpendicular to the main shaft center line is surrounded by the contour curve of the reinforced core shaft 803 on the projection surface perpendicular to the main shaft center line.

[0031] The hole of the thrust ring 10 corresponding to the combined eccentric wheel can pass through the second main shaft bearing support section 703 and the second main shaft sealing section 704 and then be sleeved on the outer surface of the combined eccentric wheel. At least it is necessary to ensure that the contour curve of the second main shaft sealing section 704 on the projection surface perpendicular to the main shaft center line is surrounded by the outer contour curve of the assembled eccentric wheel sleeve 804 on the projection surface perpendicular to the main shaft center line.

[0032] The hole of the thrust ring 10 corresponding to the first eccentric wheel 801 can pass through the first main shaft bearing support section 701 and the first main shaft sealing section 702 and then be sleeved on the outer peripheral surface of the first eccentric wheel 801. It is at least necessary to ensure that the contour curve of the first main shaft sealing section 702 on the projection surface perpendicular to the main shaft center line is surrounded by the contour curve of the first eccentric wheel 801 on the projection surface perpendicular to the main shaft center line.

[0033] It should be noted that, in conventional designs, the main shaft sealing section is designed to have a circular cross-section, that is, a cylindrical shape, and a sealing structure 15 , such as a mechanical seal, is directly mounted on the outer periphery of the main shaft sealing section.

[0034] In this embodiment, on the basis of the traditional design, the diameter of the main shaft sealing section is kept unchanged, and the eccentric distance between the main shaft 7 and the eccentric wheel is further increased to an appropriate range; wherein, for the right end of the main shaft 7 provided with the combined eccentric wheel, the projection contour curve of the second main shaft sealing section 704 in the direction perpendicular to the axis of the main shaft 7 will highlight the projection contour curve of the reinforcing core shaft 803 in the direction perpendicular to the axis of the main shaft 7; in this state, the eccentric wheel sleeve 804 cannot be assembled smoothly.

[0035] In order to solve the problem that the eccentric wheel sleeve 804 cannot be assembled, for example, Figure 2 As shown, on the right side of the main shaft 7, perpendicular to the axial direction of the main shaft 7, the main shaft sealing section material corresponding to the portion of the projection surface of the second main shaft sealing section 704 protruding beyond the projection surface of the reinforcing core shaft 803 is removed by machining. In this state, the hole belonging to the eccentric wheel sleeve 804 can smoothly pass through the second main shaft sealing section 704 and be assembled to the outer surface of the reinforcing core shaft 803; at this time, the contour curve of the projection surface of the second main shaft sealing section 704 perpendicular to the center line of the main shaft 7 is a non-circular shape, that is, the outer contour curve of the cross section of the second main shaft sealing section 704 perpendicular to the center line of the main shaft 7 is a non-circular curve.

[0036] More specifically, Figure 4As shown, at this time, the contour curve of the second main shaft sealing segment 704 connected to the reinforcing core shaft 803 on the projection surface perpendicular to the center line of the main shaft includes a first arc segment a and a second arc segment b, wherein the second arc segment b and the contour curve of the reinforcing core shaft 803 on the projection surface perpendicular to the center line of the main shaft 7 coincide with or are surrounded by each other, and the distance between the first arc segment a and the center line of the main shaft 7 is greater than the distance between the second arc segment b and the center line of the main shaft 7.

[0037] In this embodiment, the right side of the main shaft 7 is a combined eccentric wheel, and the eccentric wheel sleeve 804 is arranged on the periphery of the reinforcing core shaft 803. Therefore, on the projection surface perpendicular to the center line of the main shaft 7, the outer contour projection curve of the reinforcing core shaft 803 is surrounded by the outer contour projection curve of the eccentric wheel sleeve 804; therefore, after removing the material of the second main shaft sealing section 704, the outer contour projection curve of the second main shaft sealing section 704 perpendicular to the center line of the main shaft 7 is naturally also surrounded by the outer contour projection curve of the eccentric wheel sleeve 804. In this state, the thrust ring 10 can be smoothly assembled on the outer peripheral surface of the eccentric wheel sleeve 804.

[0038] While meeting the strength and stiffness requirements, such a design ensures the realization of manufacturing and assembly of the eccentric shaft, and further increases the eccentricity of the eccentric shaft, thereby increasing the stroke of the plunger 4 and improving the output flow and power density of the high-pressure water pump based on water or aqueous solution lubrication.

[0039] In this embodiment, this design is only used on the combined eccentric side of the main shaft. It can be seen as follows: on the basis of the traditional eccentric shaft with a combined eccentric, the main shaft sealing section connected to the reinforcing core shaft 803 is eccentric to the extreme degree, so that the projection plane of the main shaft sealing section connected to the reinforcing core shaft 803 perpendicular to the center line of the main shaft 7 exceeds the projection plane of the reinforcing core shaft 803 perpendicular to the center line of the main shaft; then the main shaft sealing section material corresponding to the portion outside the projection plane of the reinforcing core shaft 803 perpendicular to the center line of the main shaft is removed by machining, that is, to achieve the following. Figure 4 In this way, the cross-sectional shape of the main shaft sealing section connected to the reinforcing core shaft 803 will change from a circular cross-section to an irregular cross-section, that is, to a non-circular shape.

[0040] It should be noted that in designs other than this embodiment, if the eccentricity is increased further, the projected profile of the first main shaft seal segment 702 perpendicular to the axis of the main shaft 7 on one side of the integral eccentric will also protrude beyond the projected profile of the corresponding first eccentric 801 perpendicular to the axis of the main shaft 7. In this state, the thrust ring 10 cannot be mounted on the corresponding eccentric. By mechanically removing the material of the main shaft seal segment corresponding to the protruding portion, the thrust ring 10 can be smoothly passed through the first main shaft seal segment 702 and assembled onto the first eccentric 801. In this case, the projected profile of the first main shaft seal segment 702 perpendicular to the centerline of the main shaft 7 is non-circular.

[0041] When the cross-section of the main shaft seal section becomes non-circular, it becomes difficult to meet the original sealing function. In this embodiment, a circular sleeve 14 is added to the outside of the second main shaft seal section 704. A portion of the sleeve 14 along its axial direction is sleeved around the outer periphery of the second main shaft seal section 704, preferably with a clearance fit between the second main shaft seal section 704; the other portion is sleeved on the second main shaft bearing support section 703. Because the second main shaft bearing support section 703 can still be designed with a circular cross-section, the sleeve 14 can be press-fitted onto the second main shaft bearing support section 703, achieving a watertight seal between the sleeve 14 and the main shaft 7 through an interference fit or adhesive bonding.

[0042] In some designs, the inner hole of the circular sleeve 14 can be processed into a special-shaped cross-section, that is, into a shape that is compatible with the second main shaft sealing section 704. In this way, the sleeve 14 and the second main shaft sealing section 704 can be fixed together and sealed by interference fit or adhesive / sealant.

[0043] Furthermore, a sealing structure 15 is provided on the first and second main shaft sealing segments 702 and 704 at both ends of the main shaft 7. Seal structures 15 are not particularly limited and may employ, for example, mechanical seals or radial rotary seals. The contact seal between seal structures 15 and shaft sleeve 14 prevents water in the housing from leaking out of the housing.

[0044] In this embodiment, if Figure 2 As shown, two rolling bearings 11 are respectively installed in the openings on both sides of the pump housing 1. The first main shaft bearing support section 701 and the second main shaft bearing support section 703 at both ends of the eccentric shaft are respectively connected to the two rolling bearings 11 to realize the rotational connection between the eccentric shaft and the pump housing 1. The pump housing 1 is provided with a pump housing water inlet 101, which is connected to the accommodating space where the eccentric shaft is located. When the eccentric shaft rotates, the eccentric drives the center of the thrust ring 10 to make a circular motion. The thrust ring 10 can roll on the contact surface with the plunger 4 and push the plunger 4 to move in the plunger cavity 201 to achieve pressurization of the water or aqueous solution.

[0045] In addition, a rebound mechanism for use with the plunger 4 is installed in the accommodation space of the pump housing 1. The rebound mechanism includes at least one spring 5. A connecting plate 6 perpendicular to the centerline of the plunger 4 is installed on the plunger 4. One end of the spring 5 is connected to the connecting plate 6, and the other end is connected to the cylinder body 2. When the water or aqueous solution is pressurized, the rotation of the eccentric shaft drives the thrust ring 10 to roll on the contact surface with the plunger 4 and push the plunger 4 to move in the plunger cavity 201 to achieve pressurization of the water or aqueous solution. Subsequently, the plunger 4 moves in the plunger cavity 201 under the action of the rebound force of the spring 5 to draw in the water or aqueous solution. The accommodation space where the eccentric and thrust ring 10 on the eccentric shaft are located is also used to fill with water or aqueous solution. Water or aqueous solution can enter the pump housing 1 to reduce the friction generated by the sliding movement between the thrust ring 10 and the eccentric, and between the plunger 4 and the plunger cavity 201, and to remove heat.

[0046] In the description of this utility model, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate 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.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-pressure water pump based on water or aqueous solution lubrication, characterized in that: The invention comprises a pump housing (1), a liquid cylinder body (2), a driving mechanism, at least one plunger (4) and a plunger cavity (201); the liquid cylinder body (2) is fixedly connected to the pump housing (1); an internal space formed after the liquid cylinder body (2) and the pump housing (1) are connected is a receiving space; the plunger (4) and the driving mechanism are arranged in the receiving space, and the receiving space is also used to fill water or an aqueous solution; one end of the plunger (4) extends into the plunger cavity (201) and cooperates with the plunger cavity (201), and the other end cooperates with the driving mechanism; The driving mechanism comprises an eccentric shaft and a thrust ring (10), wherein the eccentric shaft comprises a main shaft (7) and a plurality of eccentrics arranged on the main shaft (7), wherein the outer portion of each eccentric is provided with a thrust ring (10) corresponding to the eccentric for rolling contact with the plunger (4); both ends of the main shaft (7) extend outward from the outer edge of the outermost eccentric to form a main shaft sealing section; The main shaft sealing section on at least one side of the main shaft (7) has a cross-sectional outer contour curve perpendicular to the center line of the main shaft (7) that is a non-circular curve, and a shaft sleeve (14) is provided on the outer shell of the main shaft sealing section, and a sealing structure (15) is provided on the outer peripheral surface of the shaft sleeve (14), and contact sealing is achieved between the sealing structure (15) and the shaft sleeve (14) to prevent water from leaking from the accommodating space.

2. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: The eccentric wheel is an integral eccentric wheel or a combined eccentric wheel; at least the outermost eccentric wheel located at one end of the main shaft (7) is a combined eccentric wheel, and the combined eccentric wheel comprises a reinforcing core shaft (803) and an eccentric wheel sleeve (804) sleeved on the outer peripheral surface of the reinforcing core shaft (803); the contour curve of the reinforcing core shaft (803) on the projection surface perpendicular to the center line of the main shaft (7) is non-circular; the contour curve of the main shaft sealing section close to the combined eccentric wheel on the projection surface perpendicular to the center line of the main shaft is non-circular, and its projection surface falls within the projection surface of the reinforcing core shaft (803) on the projection surface perpendicular to the center line of the main shaft (7).

3. A high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that: The contour curve of the main shaft sealing section on the projection surface perpendicular to the center line of the main shaft (7) includes a first arc segment and a second arc segment; wherein the second arc segment and the contour curve of the reinforcing core shaft (803) on the projection surface perpendicular to the center line of the main shaft (7) coincide with each other, and the distance between the first arc segment and the center line of the main shaft (7) is greater than the distance between the second arc segment and the center line of the main shaft (7).

4. A high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that: The eccentric wheel comprises at least one integral eccentric wheel and at least one combined eccentric wheel, and the integral eccentric wheel and the main shaft (7) are formed with continuous material.

5. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: A bearing support section is provided outside the main shaft sealing section and extends in the axial direction of the main shaft (7); a portion of the shaft sleeve (14) is sleeved on the bearing support section, and a portion is sleeved on the main shaft sealing section; the shaft sleeve (14) and the bearing support section are connected by interference fit or adhesive bonding, thereby achieving a seal between the shaft sleeve (14) and the main shaft (7), and preventing water from flowing out of the accommodating space along the main shaft (7).

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