High-pressure water pump lubricated by water or aqueous solution

Abstract

A high-pressure water pump lubricated by water or an aqueous solution, the high-pressure water pump comprising a water pump inlet, a liquid cylinder, a shell, a plunger cavity, a plunger and a driving mechanism. A communication flow channel for water supply to a water intake check valve is provided between an accommodating space and the water intake check valve. Water or an aqueous solution flows through the water pump inlet and the accommodating space and then flows to the water intake check valve through the communication flow channel, thereby realizing the water supply of the water pump. The present invention realizes adequate cooling and lubrication of a moving mechanism in the accommodating space. By means of the special design of the communication flow channel from the accommodating space to the liquid cylinder, and the communication flow channel having a specific size and shape, such as a small hole or a slit, the flow resistance of water or the aqueous solution is increased, thereby reducing the effect on the pumping of water or the aqueous solution due to flow field disturbance, such that high-pressure water can be stably output, the operating noise of the water pump is reduced, and the operating stability of the water pump is improved.

Description

High-pressure water pumps lubricated by water or aqueous solutions Technical Field

[0001] This invention relates to a high-pressure water pump lubricated by water or aqueous solution. Background Technology

[0002] Water-lubricated high-pressure water pumps use water inside the casing to lubricate and cool the moving mechanisms (specifically including the pump drive mechanism and other moving structures). This eliminates the need for the lubricating oil used in traditional water pumps, avoids environmental pollution, and allows for long-term maintenance-free operation, making it an ideal environmentally friendly power equipment.

[0003] In existing technologies, such as patent ZL202321748625.7, the newly developed water-lubricated high-pressure water pump utilizes the rolling contact between a thrust ring sleeved on an eccentric wheel shaft and the plunger's contact surface to drive the plunger to move and perform work within the plunger cavity, thereby pressurizing water or an aqueous solution. This patented water pump lubricates and cools the moving mechanism using water or an aqueous solution. Benefiting from its hydrostatic support-free structural design, this water pump can provide high pressure and has a simple structure and low manufacturing cost.

[0004] The design of the inlet and outlet water of a water-lubricated high-pressure water pump is a crucial aspect of pump development. A good inlet and outlet design must ensure sufficient lubrication and cooling of the power mechanism while also guaranteeing quiet and stable pump operation. As described in patent 201510036848.4, this water-lubricated pump places the water inlet on the housing. Water or an aqueous solution first enters the housing from the supply pipe, lubricates and cools the moving mechanism within the housing, and then flows into the cylinder. Through the coordinated movement of the inlet check valve, outlet check valve, and plunger, the water is pressurized and flows out of the pump body. This inlet method is simple in structure and provides good cooling for the moving mechanism within the housing. However, actual testing revealed that the pump using this inlet method is noisy, produces large pulsations in the high-pressure water output, and exhibits poor pump stability.

[0005] Further investigation revealed that after water or an aqueous solution enters the casing, the high-speed rotation of the eccentric wheel shaft agitates the water within the casing, causing a rapid and unstable flow. This turbulent water flow, upon entering the liquid cylinder, impacts and disrupts the stability of the inlet and outlet check valves. As a result, the pump's fluid pulsation increases, significantly increasing pump noise and deteriorating its operational stability. Summary of the Invention

[0006] (a) Technical issues

[0007] Therefore, through the analysis of the current status of water-lubricated high-pressure water pump technology, how to solve the problems of high noise and poor working stability of existing water-lubricated high-pressure water pumps, while ensuring that the lubrication and cooling capacity of the water pump remains unchanged, so as to make the high-pressure water pump work more stably and quietly and provide stable boosted water with less pulsation, has become an urgent problem to be solved by those skilled in the art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] This invention provides a high-pressure water pump based on water or aqueous solution lubrication. The high-pressure water pump includes: a water pump inlet, a cylinder body, a housing, a plunger cavity, a plunger, and a drive mechanism. The cylinder body is equipped with an inlet check valve and an outlet check valve. The drive mechanism includes an eccentric wheel shaft with an eccentric wheel mounted on it. At least one plunger is provided, and the plunger cavity has plunger holes corresponding to each plunger, allowing the plunger to reciprocate within the plunger holes. The cylinder body is fixedly connected to the housing, and the internal space formed by the connection is a receiving space. The eccentric wheel is located within this receiving space, which is also used to fill with water or an aqueous solution.

[0011] A connecting channel for supplying water to the inlet check valve is provided between the accommodating space and the inlet check valve; water or aqueous solution first flows through the water pump inlet into the accommodating space, and then flows through the connecting channel to the inlet check valve to supply water to the water pump;

[0012] When the minimum cross-section of the connecting channel is circular, the cross-sectional area of ​​the minimum cross-section of the connecting channel is less than 1 / 4 of the cross-sectional area of ​​a single plunger hole, and the number of connecting channels is greater than or equal to 2.

[0013] When the minimum cross-sectional area of ​​the connecting channel is of other shapes, the minimum cross-sectional area of ​​the connecting channel is less than 1 times the cross-sectional area of ​​a single plunger orifice.

[0014] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, a filter element made of porous material is provided between the receiving space and the inlet check valve. The porous material filter element has interconnected holes inside, and the holes inside the filter element form the connecting flow channel. Water or aqueous solution flows through the holes inside the porous material filter element to achieve fluid communication between the receiving space and the inlet check valve.

[0015] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, the average diameter of the holes provided on the porous material filter is less than 3 mm.

[0016] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, the inlet check valve is horizontally arranged, and the inlet of the inlet check valve is arranged in a direction opposite to the eccentric wheel shaft.

[0017] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, the outlet check valve is vertically arranged, and the inlet of the outlet check valve is arranged in the direction of the inlet check valve.

[0018] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, the cylinder body includes a cylinder body main body and a cylinder body water inlet component. The plunger cavity is manufactured separately from the cylinder body. The cylinder body water inlet component, the cylinder body main body and the plunger cavity are connected into a sandwich integrated structure by screws with the cylinder body main body as the intermediate layer.

[0019] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, the water inlet component of the cylinder body is provided with a main water inlet channel, the main water inlet channel is connected to a one-way water inlet valve, and the accommodating space is connected to the main water inlet channel through the connecting channel for supplying water to the main water inlet channel.

[0020] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by the present invention, a thrust ring structure is sleeved on the outer peripheral surface of the eccentric wheel, and the thrust ring structure is rotatably connected to the eccentric wheel.

[0021] (III) Beneficial Effects

[0022] In the above structural design:

[0023] 1. This invention introduces the inlet water of the water-lubricated high-pressure water pump into the pump's internal containment space, achieving sufficient cooling and lubrication of the moving mechanism within the containment space. Through the design of a connecting flow channel from the containment space to the cylinder body, using connecting flow channels of appropriate size and shape such as orifices or slits, the flow resistance of the water or aqueous solution is increased, thereby reducing the impact of turbulent flow on the pumping of the water or aqueous solution. This allows for stable output of high-pressure water, reduces pump operating noise, and improves the pump's operational stability.

[0024] 2. The present invention further proposes to realize the connected flow channel by using a porous material filter. The porous material filter can provide a dense, small-hole type of connected flow channel, which has a better ability to stabilize the flow.

[0025] Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0027] Figure 1 is a schematic diagram of the structure of a high-pressure water pump based on water or aqueous solution lubrication in one embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the structure of a high-pressure water pump based on water or aqueous solution lubrication with a filter element in another embodiment of the present invention.

[0029] In Figures 1 and 2, the correspondence between component names and reference numerals is as follows:

[0030] 1. Main body of hydraulic cylinder; 2. Hydraulic cylinder inlet component; 3. Housing; 4. Accommodation space; 5. Plunger cavity; 6. Plunger hole; 7. Plunger; 8. Anti-friction sleeve; 9. Spring bracket; 10. Eccentric wheel shaft; 11. Eccentric wheel; 12. Thrust ring; 13. Main inlet channel; 14. Inlet flow channel; 15. Outlet flow channel; 16. Inlet check valve; 17. Outlet check valve; 18. Screw; 19. Connecting flow channel; 20. Filter component; 21. Water pump inlet; 22. Hydraulic cylinder body; 23. Drive mechanism; 24.

[0031] Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0033] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," 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 the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] Please refer to Figures 1 and 2, where Figure 1 is a structural schematic diagram of a high-pressure water pump based on water or aqueous solution lubrication in one embodiment of the present invention; Figure 2 is a structural schematic diagram of a high-pressure water pump based on water or aqueous solution lubrication in another embodiment of the present invention when a filter is provided.

[0035] This invention provides a high-pressure water pump based on water or aqueous solution lubrication. In this invention, the high-pressure water pump based on water or aqueous solution lubrication (hereinafter referred to as the high-pressure water pump) includes: a water pump inlet 22, a hydraulic cylinder 23 (also called a pump head), a housing 3, a plunger cavity 5, a plunger 7 (a structural component that is movably engaged with the plunger cavity 5), and a drive mechanism (including an eccentric wheel shaft 11, the eccentric wheel shaft 11 including a main shaft, a plurality of eccentric wheels 12 arranged on the main shaft, and a thrust ring 13 arranged on the outer circumferential surface of the eccentric wheel 12).

[0036] The plunger cavity 5 is a solid component, comprising one or more cylindrical structures arranged side by side (the hollow structure in the middle of the cylindrical structure is the plunger hole 6). One end of the plunger cavity 5 is used for the assembly of the plunger 7, and the other end of the plunger cavity 5 is provided with a flat plate structure for assembly with the hydraulic cylinder body 1. When there are multiple plunger cavities 5 (which can also be understood as when there are multiple plunger holes 6), each plunger hole 6 is equipped with a plunger 7. Correspondingly, multiple eccentric wheels 12 are also provided, each corresponding to one plunger 7.

[0037] The cylinder body 23 and the housing 3 are fixedly connected together, and the internal space formed by the connection of the cylinder body 23 and the housing 3 is the receiving space 4. The plunger cavity 5 is set in the receiving space 4. The cylinder body and the plunger cavity 5 are fixedly connected or the cylinder body and the plunger cavity 5 are integrally molded. A plunger hole 6 is provided in the plunger cavity 5, and a wear-reducing sleeve 8 is provided in the plunger hole 6. The plunger 7 and the plunger hole 6 are in a sliding fit (specifically, the plunger 7 and the wear-reducing sleeve 8 are in a sliding fit). The plunger 7 reciprocates in the plunger hole 6. Specifically, the wear-reducing sleeve 8 has a cylindrical structure. The outer surface of the wear-reducing sleeve 8 abuts against the inner wall of the plunger hole 6, and the inner surface of the wear-reducing sleeve 8 forms a sliding friction structure with the plunger 7. During operation, the plunger 7 and the wear-reducing sleeve 8 rub against each other, effectively reducing the frictional wear on the plunger cavity 5.

[0038] The hydraulic cylinder body is equipped with an inlet channel 15 and an outlet channel 16, an inlet check valve 17 and an outlet check valve 18. The inlet channel 15 is connected to the inlet of the inlet check valve 17, and the outlet channel 16 is connected to the outlet of the outlet check valve 18. When the inlet check valve 17 and the outlet check valve 18 are not installed, the inlet channel 15 and the outlet channel 16 are connected. The inlet channel 15 and the outlet channel 16 are also connected to the plunger hole 6. The inlet channel 15 and the outlet channel 16 are two-channel structures, and they are connected through the plunger hole 6 (when there are multiple plunger holes, each plunger hole is equipped with a set of inlet and outlet channels). As shown in Figure 1, for a plunger hole and a set of corresponding inlet and outlet channels, in the depth direction, the outer channel is the inlet channel and the inner channel is the outlet channel.

[0039] The drive mechanism 24 includes an eccentric shaft 11, eccentric wheels 12, and thrust rings 13. Each eccentric wheel 12, corresponding to a plunger 7, is fixed to the eccentric shaft 11. A corresponding thrust ring 13 is fitted onto the outer circumference of each eccentric wheel 12, and the thrust ring 13 can rotate with the eccentric wheel 12 (the thrust ring 13 rotates together with the eccentric wheel 12). Furthermore, the present invention provides a main water inlet channel 14 on the cylinder body. When multiple water inlet channels 15 are provided, corresponding to each one-way water inlet valve 17, all water inlet channels 15 are connected in parallel and communicate with the main water inlet channel 14. The thrust ring 13 is a ring-shaped structure mounted on the outer surface of the eccentric wheel 12. When the eccentric wheel 12 pushes the plunger 7 to reciprocate, it has sliding friction with the plunger 7. After the thrust ring 13 is provided on the eccentric wheel 12, the eccentric wheel 12 rubs against the plunger 7 through the thrust ring 13, which can effectively reduce the friction loss of the eccentric wheel 12.

[0040] Under the action of the spring force (in this invention, a spring assembly is provided in the accommodating space 4, the spring assembly includes a spring bracket 9 and a spring 10, the length direction of the spring 10 is consistent with the movement direction of the plunger 7, one end of the spring 9, as shown in the left end in Figure 1, is set at the edge of the plunger cavity 5, and the other end of the spring 9, as shown in the right end in Figure 1, is set with a spring bracket 9, which is set on the plunger 7, and two springs are correspondingly set on both sides of the plunger, respectively, and the spring bracket 9 is connected to the two springs across the plunger hole 6), the end face of the plunger 7 always remains in contact with the thrust ring 13. When the eccentric wheel shaft is driven to rotate by the motor, the eccentric wheel 12 that rotates accordingly also drives the center of the thrust ring 13 to make a circular motion around the axis of the eccentric wheel shaft. When the thrust ring 13 makes a circular motion and its direction of motion approaches the direction of the hydraulic cylinder (the centroid of the eccentric wheel 12 and the rotation center are not at the same point, so when rotating, the centroid of the eccentric wheel 12 moves around the rotation center and presents a reciprocating cyclic motion state of approaching-moving away-approaching-moving away... relative to the hydraulic cylinder body, the thrust ring 13 is set on the eccentric wheel 12 and rotates with the eccentric wheel 12, so the motion state of the thrust ring 13 is consistent with the motion state of the eccentric wheel 12), the thrust ring 13 pushes the plunger 7 to move towards the hydraulic cylinder body (away from the eccentric wheel shaft) in the plunger hole 6 while it abuts and rolls against the end face of the plunger 7, squeezing the water or aqueous solution in the plunger hole 6. At this time, the inlet check valve 17 is closed and the outlet check valve 18 is opened. The water or aqueous solution is pressurized and flows through the outlet check valve 18 to be discharged from the water pump. When the thrust ring 13 makes a circular motion away from the hydraulic cylinder, the spring 10 pushes the plunger 7 to move away from the hydraulic cylinder (towards the eccentric wheel shaft) within the plunger hole 6. Under the action of the spring force, the thrust ring 13 still abuts against the end face of the plunger 7 and rolls. At this time, the inlet check valve 17 opens, while the outlet check valve 18 closes, and water enters the plunger hole 6 through the inlet check valve 17.

[0041] The eccentric wheel 12 and the thrust ring 13 are also disposed in the receiving space 4, which is used to fill water or aqueous solution. The water or aqueous solution can lubricate and cool the sliding friction pair formed by the thrust ring 13 and the eccentric wheel 12, and can also lubricate and cool the sliding friction pair formed by the plunger 7 and the plunger hole 6.

[0042] The water pump inlet can be located on the liquid cylinder 23, or on the housing 3 or other parts, preferably on the housing 3.

[0043] In this embodiment, the cylinder body 23 consists of two independent components: the cylinder body 1 and the cylinder inlet component 2. The cylinder body 1 houses the inlet check valve 17 and the outlet check valve 18. As shown in Figures 1 and 2, in one specific embodiment of the invention, the inlet check valve 17 is placed horizontally with its inlet facing away from the eccentric wheel shaft, while the outlet check valve 18 is placed vertically with its inlet facing downwards. The inlet check valve 17, the outlet check valve 18, the plunger 7, and the eccentric wheel 12 are in a one-to-one correspondence. The number of inlet check valves 17 and outlet check valves 18 is greater than or equal to two, and they are arranged sequentially along a direction parallel to the eccentric wheel shaft, corresponding to the eccentric wheel 12. The hydraulic cylinder inlet component 2 is provided with a main channel parallel to the axis of the eccentric wheel. Water or aqueous solution first enters the main inlet channel 14 and then flows along the main inlet channel 14 to the inlet of each inlet check valve 17. The hydraulic cylinder inlet component 2, the hydraulic cylinder body 1, and the plunger cavity 5 are connected as a whole by screws 19, forming a "sandwich" composite structure with the hydraulic cylinder body 1 as the middle layer.

[0044] Water or aqueous solution from a water source enters the containing space 4 after passing through the water pump inlet 22. Within the containing space 4, the heat and abrasive particles generated by the moving mechanism (including the drive mechanism and other moving parts) are rapidly dispersed into the water or aqueous solution through the stirring and mixing action of the eccentric wheel shaft. In this embodiment, a connecting channel 20 is provided on the cylinder body (including the cylinder body body 1 and the cylinder body water inlet component 2). The connecting channel 20 connects the containing space 4 and the cylinder body water inlet component 2, allowing the water or aqueous solution in the containing space 4 to pass through the connecting channel 20 and the main channel of the cylinder body water inlet component 2 to the inlet of the one-way valve 17.

[0045] In a traditional design, the flow channel between the receiving space 4 and the inlet check valve 17 of the liquid cylinder is a circular flow channel with a sufficiently large cross-sectional area. This ensures minimal pressure loss during water or aqueous solution flow and facilitates equipment manufacturing. The eccentric wheel shaft agitates the water or aqueous solution in the receiving space 4 at high speed, causing turbulent flow and large pulsations within the space. If, according to the traditional design, the water or aqueous solution in the receiving space 4 directly enters the inlet of the inlet check valve 17 through the connecting flow channel 20, it would worsen the pump's intake conditions, leading to increased pump noise and decreased output pressure stability. Because the water pump uses check valves (inlet check valve 17 and outlet check valve 18) for flow distribution, and the check valves work by utilizing springs, valve plates, and changes in the inlet and outlet water pressure environment, the valve plates have a small mass and the spring force is also small. Under the pressure pulsation of the water or aqueous solution flow field, the stability of the water pump's inlet and the operation of the check valves will deteriorate due to the influence of water flow fluctuations. This will increase the operating noise of the water pump and the pressure fluctuation of the output high-pressure water, which will seriously affect the user experience of the water pump.

[0046] The solution to the above-mentioned problem in this invention is to change the connecting flow channel 20 between the accommodating space 4 and the water inlet component 2 of the liquid cylinder from the traditional circular hole with a large cross-sectional area to a collection of a larger number of small cross-sectional areas. It should be noted that the number of connecting flow channels 20 is defined as the total number of flow channels that connect the water inlet check valve 17 and the accommodating space 4, and at least in a portion of the flow section, allow independent flow of water or aqueous solution.

[0047] The flow of water through the orifice experiences significantly increased flow resistance due to friction. This resistance suppresses fluid pulsation and converts pulsation energy into heat. Under the available pressure differential, although the orifice suppresses pulsation, the water velocity and flow rate are low. If a sufficient number of orifices are installed in the water path connecting the containment space 4 and the inlet check valve 17, allowing water to flow through these orifices simultaneously and collecting the water flowing out, theoretically, a sufficient supply of water could be provided to the pump inlet check valve 17.

[0048] Studies have shown that when the minimum cross-sectional area of ​​the connecting channel 20 from the accommodating space 4 to the inlet check valve 17 is circular (i.e., when the connecting channel 20 is a circular hole structure), the minimum cross-sectional area of ​​the channel must be at least less than 1 / 4 of the cross-sectional area of ​​a single plunger hole 6, and the number of channels must be greater than or equal to 2. When the connecting channel 20 has a special shape, such as an annular channel or a narrow slit channel, because the narrow slit has greater flow resistance than a circular hole under the same cross-sectional area, a channel with a larger cross-sectional area can be used. As long as the slit width is designed to be small enough and the slit is long enough, considering the space constraints of engineering design, the channel cross-sectional shape is limited to non-circular (e.g., elliptical hole, regular polygonal hole, flat hole, etc.). The minimum cross-sectional area of ​​the connecting channel 20 (the minimum flow cross-sectional area of ​​the connecting channel 20) must be less than the cross-sectional area of ​​a single plunger hole 6.

[0049] In this invention, the cross section refers to the section on the pipe or channel (specifically the connecting flow channel 20) that is perpendicular to the flow direction of water or aqueous solution.

[0050] Creating numerous small holes or narrow slits on the cylinder body to form interconnected flow channels would undoubtedly increase processing costs. A better approach is to install a porous material filter 21 between the receiving space 4 and the inlet check valve 17. The porous material filter 21 can be installed on the cylinder body or on the external pipeline. The porous material can be a material with a network structure of interconnected pores, forming interconnected flow channels. Water or an aqueous solution can flow from the receiving space 4 through the pores inside the porous material filter 21, achieving fluid communication between the receiving space 4 and the main inlet channel 14. In this invention, the porosity of the porous material filter can reach 90%. The pores in the porous material are typically small, with diameters ranging from a few nanometers to a few millimeters. Common filter materials include porous ceramics and metal foams with millimeter-sized pores. By using these porous materials in the connecting channel 20, it is equivalent to setting a considerable number of small-sized channels in a low-cost manner. In order to meet the filtering effect (i.e., to minimize the influence of "waves"), the average aperture of the small holes on the filter element 21 is limited to less than 3mm.

[0051] It should be noted that the aforementioned "wave" is caused by the frequent passage of water through the connecting channel 20 when the eccentric wheel 12 rotates and drives the plunger 7 to move. After the filter element 21 is installed, the small holes on the filter element 21 have a "damping" effect on the water flow (allowing the water flow to pass through, but with some obstruction to the water flow), thereby reducing the effect of the "wave".

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within 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 system includes: a water pump inlet (22), a hydraulic cylinder (23), a housing (3), a plunger chamber (5), a plunger (7), and a drive mechanism (24); the hydraulic cylinder (23) is provided with an inlet check valve (17) and an outlet check valve (18); the drive mechanism (24) includes an eccentric wheel shaft (11), and an eccentric wheel (12) is provided on the eccentric wheel shaft (11); at least one plunger (7) is provided, and the plunger chamber (5) is provided with plunger holes (6) corresponding to the plunger (7), and the plunger (7) can slide back and forth in the plunger holes (6); the hydraulic cylinder (23) is fixedly connected to the housing (3), and the internal space formed after the hydraulic cylinder (23) and the housing (3) are connected is a receiving space (4), the eccentric wheel (12) is provided in the receiving space (4), and the receiving space (4) is also used to fill water or an aqueous solution; A connecting channel (20) for supplying water to the inlet check valve (17) is provided between the accommodating space (4) and the inlet check valve (17); water or aqueous solution first flows through the accommodating space (4) through the water pump inlet (22), and then flows through the connecting channel (20) to the inlet check valve (17) to realize the water pump supply; When the minimum flow channel cross-section of the connecting channel (20) is circular, the minimum flow channel cross-sectional area of ​​the connecting channel (20) is less than 1 / 4 of the cross-sectional area of ​​a single plunger hole (6), and the number of connecting channels (20) is greater than or equal to 2. When the minimum cross-sectional area of ​​the connecting channel (20) is of other shapes, the minimum cross-sectional area of ​​the connecting channel (20) is less than 1 times the cross-sectional area of ​​a single plunger hole (6).

2. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, A filter element (21) made of porous material is provided between the containment space (4) and the inlet check valve (17). The filter element (21) has interconnected holes inside, and the holes inside the filter element (21) form the connecting flow channel (20). Water or aqueous solution flows through the holes inside the porous material filter element (21) to achieve fluid communication between the containment space (4) and the inlet check valve (17).

3. The high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that, The average diameter of the holes set on the porous material filter (21) is less than 3 mm.

4. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The inlet check valve (17) is set horizontally, and the inlet of the inlet check valve (17) is set in the opposite direction to the eccentric wheel shaft (11).

5. The high-pressure water pump based on water or aqueous solution lubrication according to claim 4, characterized in that, The outlet check valve (18) is set vertically, and the inlet of the outlet check valve (18) is set in the direction of the inlet check valve (17).

6. The high-pressure water pump based on water or aqueous solution lubrication according to claim 4, characterized in that, The cylinder body (23) includes a cylinder body main body (1) and a cylinder body water inlet component (2). The plunger cavity (5) is manufactured separately from the cylinder body (23). The cylinder body water inlet component (2), the cylinder body main body (1) and the plunger cavity (5) are connected into a sandwich integrated structure by screws (19) with the cylinder body main body (1) as the middle layer.

7. The high-pressure water pump based on water or aqueous solution lubrication according to claim 6, characterized in that, The liquid cylinder body water inlet component (2) is provided with a water inlet main channel (14), which is connected to the water inlet check valve (17). The accommodating space (4) is connected to the water inlet main channel (14) through the connecting flow channel (20) and is used to supply water to the water inlet main channel (14).

8. The high-pressure water pump based on water or aqueous solution lubrication according to any one of claims 1 to 7, characterized in that, A thrust ring (13) is fitted on the outer circumferential surface of the eccentric wheel (12), and the thrust ring (13) and the eccentric wheel (12) are rotatably connected.

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