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

Abstract

The utility model relates to a high pressure water pump based on water or aqueous solution lubrication, including liquid cylinder body, water pump casing, plunger cavity, at least two plunger and eccentric shaft, the liquid cylinder body is provided with water inlet check valve and water outlet check valve in, the eccentric shaft includes spindle and sets up eccentric wheel on the spindle, the plunger cavity is provided with and the plunger one -to -one corresponding plunger hole, the plunger can reciprocate sliding in the plunger hole, the water pump casing is provided with and the liquid cylinder body fixed connection's butt -joint end face, the liquid cylinder body and the water pump casing connect and form the internal space of after, the internal space is provided with the eccentric wheel in the accommodation space, the liquid cylinder body can make full use of the high bending stiffness characteristic of plunger cavity bending deformation along plunger cylindrical surface axis direction, effectively reduces the deformation under the external force load condition, makes the liquid cylinder body vibration significantly reduce, structural stress alleviation, the service life of liquid cylinder body significantly improves.

Description

Technical Field

[0001] This utility model relates to the field of 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 an aqueous solution 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. The cylinder body is the most crucial pressure-bearing component of the high-pressure water pump. It contains high and low pressure flow channels and must withstand the high pressure of the liquid within these channels. Furthermore, the cylinder body is subjected to significant forces along the cylindrical axis of multiple plungers generated during water pressurization (even in low-power high-pressure water pumps, the force exerted by a single plunger can reach thousands of Newtons). These forces are not constant but typically pulsating. Under considerable varying force loads, insufficient rigidity of the cylinder body or its fixed connections can easily lead to vibration. Under already high-stress loads, vibration accelerates fatigue damage to the cylinder body and can also cause the high-pressure water plug threads on the cylinder body to loosen, resulting in high-pressure water ejecting from the cylinder body and severely impacting the normal operation of the water pump.

[0003] The newly developed water-lubricated high-pressure water pump has a cylinder body and housing fixedly connected by threaded fasteners. The cylinder body's projection plane perpendicular to the piston's cylindrical axis has an approximate rectangular shape, with the eccentric wheel axis as the horizontal direction, the upper and lower contour sides as the long sides, and the left and right contour sides as the short sides. For example... Figure 6 As shown, the mating end face 102 of the pump housing and the cylinder body is a hollow structure with an approximately rectangular outline. An upper side frame 103, a lower side frame 104, a left side frame 105, and a right side frame 106 are arranged around the hollow portion. In engineering design, to improve connection strength and rigidity, fixing spaces for connecting parts are usually found on the structural components to achieve closer spacing of threaded fasteners and reduce vibration of the connected parts. In previous connection methods, such as... Figure 6 As shown, the threaded connection points of the hydraulic cylinder and the water pump housing are located on the upper side frame 103 and the lower side frame 104 of the mating end face 102. The deformation of the cylinder body under the piston thrust in this connection method is as follows... Figure 7As shown, the plunger force acts on the cylinder body along the axis of the plunger's cylindrical surface. The cylinder body bulges outward from the pump along the plunger axis, while the upper and lower ends of the cylinder body remain fixed or undergo only minor deformation due to the threaded fasteners. Simultaneously, the cylinder body transmits the force to the threaded fasteners at the upper and lower ends, and further to the pump housing through the fasteners. This force distribution is similar to a span beam with force in the middle and support at both ends. To meet the housing's internal space requirements, even with the closest threaded connection at the upper and lower ends, the connection distance is relatively long (e.g., more than 60mm for a low-power water-lubricated high-pressure water pump). With this connection method, the pump exhibits significant vibration in the cylinder body during operation. This vibration can easily cause the high-pressure water plug on the cylinder body to loosen, leading to pump leakage. Furthermore, the cylinder body is prone to fatigue cracking after a period of operation. According to conventional design methods, in order to meet the requirements of water pump use, the thickness of the water pump cylinder body needs to be increased. The cylinder body is usually made of copper alloy material, which is relatively expensive. This will inevitably increase the manufacturing cost significantly, and also increase the size and weight of the water pump.

[0004] In summary, how to reduce the vibration of the hydraulic cylinder during operation, improve its fatigue life, and prevent the high-pressure water plug from loosening, while increasing the structural weight and volume by a small amount or almost no amount, has become an urgent technical problem to be solved. Utility Model Content

[0005] (I) The problem to be solved by this utility model is: how to reduce the vibration of the hydraulic cylinder body during operation, improve the fatigue life of the hydraulic cylinder body, and prevent the high-pressure water plug from loosening, under the premise of increasing the structural weight and volume by a small amount or almost no increase.

[0006] (II) Technical Solution

[0007] A high-pressure water pump based on water or aqueous solution lubrication includes a cylinder body, a pump housing, a plunger cavity, at least two plungers, and an eccentric wheel shaft. The cylinder body is equipped with an inlet check valve and an outlet check valve. The eccentric wheel shaft includes a main shaft and an eccentric wheel mounted on the main shaft. The plunger cavity has plunger holes corresponding to the plungers, allowing the plungers to reciprocate within the plunger holes. The pump housing has a mating end face that is fixedly connected to the cylinder body. The internal space formed after the cylinder body and pump housing are connected is a receiving space, within which the eccentric wheel is located. The receiving space is also used to fill with water or an aqueous solution.

[0008] The docking end face is a hollow structure with a hollow part. The docking end face is surrounded by an upper side frame, a lower side frame, a left side frame and a right side frame in sequence.

[0009] At least one threaded fastener is provided on the left and right sides of the mating end face, and the hydraulic cylinder body and the mating end face are fixedly connected by the threaded fastener.

[0010] The plunger cavity and the hydraulic cylinder are fixedly connected. Along the axis of the main shaft, the maximum outline dimension of the plunger cavity is at least 3 / 5 greater than the minimum distance between the left side frame and the right side frame.

[0011] According to one embodiment of the present invention, the plunger cavity is fixedly connected to the hydraulic cylinder body by a plurality of threaded fasteners, and the plurality of threaded fasteners are arranged along the axis of the main shaft.

[0012] According to one embodiment of the present invention, the number of threaded fasteners is greater than or equal to 4.

[0013] According to one embodiment of the present invention, the threaded fasteners are provided in two rows along the height direction of the plunger cavity.

[0014] According to one embodiment of the present invention, the number of threaded fasteners in each row is greater than or equal to 3.

[0015] According to one embodiment of the present invention, the number of threaded fasteners on the left side frame and the number of threaded fasteners on the right side frame are the same and correspond one-to-one, and the number of threaded fasteners on the left side frame is greater than or equal to 3.

[0016] According to one embodiment of the present invention, the plunger cavity is manufactured from the same continuous material, and the plunger hole is provided with a friction-reducing material.

[0017] According to one embodiment of the present invention, the cylinder body and the plunger cavity are manufactured from the same continuous material.

[0018] The beneficial effects of this invention are as follows: By designing a plunger cavity with sufficient contour length, the plunger cavity is used to enhance the bending deformation stiffness of the hydraulic cylinder body in a specific direction. Furthermore, threaded fasteners are provided on the left and right side borders of the mating end faces of the water pump housing and the hydraulic cylinder body, and these threaded fasteners are used to fix the hydraulic cylinder body and the water pump housing together. Through this stiffness enhancement and connection method, the hydraulic cylinder body can fully utilize the high bending stiffness characteristics of the plunger cavity along the axis of the plunger cylindrical surface, effectively reducing deformation under external load conditions. This significantly reduces hydraulic cylinder vibration, alleviates structural stress, and significantly extends the service life of the hydraulic cylinder body. The attached threaded fasteners on the hydraulic cylinder body are less prone to loosening. Compared with the original design, this design only slightly increases the structural weight and does not significantly increase manufacturing costs, but the effect is very significant. Attached Figure Description

[0019] 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.

[0020] Figure 1 A cross-sectional view of a high-pressure water pump provided in an embodiment of this utility model;

[0021] Figure 2 A schematic diagram of the mating end face of the water pump housing provided in an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the plunger cavity provided in an embodiment of this utility model;

[0023] Figure 4 A schematic diagram showing the deformation of the hydraulic cylinder when the threaded fasteners provided in this embodiment of the utility model are set on the left and right side borders of the mating end face of the water pump housing;

[0024] Figure 5 A schematic diagram of the force relationship between the plunger cavity and the hydraulic cylinder body provided for an embodiment of this utility model;

[0025] Figure 6 A schematic diagram of the mating end face of the water pump housing in the original design provided for the embodiments of this utility model;

[0026] Figure 7 A schematic diagram showing the deformation of the hydraulic cylinder when the threaded fasteners are set on the mating end face and lower side frame of the water pump housing in the original design scheme provided for the embodiments of this utility model.

[0027] Icons: 1. Pump housing; 101. Accommodation space; 102. Dating face; 103. Top side frame; 104. Bottom side frame; 105. Left side frame; 106. Right side frame; 107. Threaded hole; 2. Plunger chamber; 201. Plunger hole; 202. Threaded connection hole; 3. Cylinder body; 4. Plunger; 5. Eccentric wheel; 6. Thrust ring; 7. Main shaft; 8. Outlet check valve; 9. Inlet check valve; 10. Spring; 11. Spring bracket. Detailed Implementation

[0028] 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.

[0029] like Figures 1-5 As shown, one embodiment of this utility model provides a liquid cylinder body 3, a water pump housing 1, a plunger cavity 2, at least two plungers 4, and an eccentric wheel shaft; the liquid cylinder body 3 is provided with an inlet check valve 9 and an outlet check valve 8; the eccentric wheel shaft includes a main shaft 7 and an eccentric wheel 5 disposed on the main shaft 7; the plunger cavity 2 is provided with plunger holes 201 corresponding to the plungers 4, and the plungers 4 can slide back and forth in the plunger holes 201; the water pump housing 1 is provided with a mating end face 102 that is fixedly connected to the liquid cylinder body 3, and the internal space formed after the liquid cylinder body 3 and the water pump housing 1 are connected is a receiving space 101, the eccentric wheel 5 is disposed in the receiving space 101, and the receiving space 101 is also used to fill water or an aqueous solution;

[0030] The mating end face 102 has a hollow structure with a hollow part 108. Around the hollow part 108, the mating end face 102 has an upper side frame 103, a lower side frame 104, a left side frame 105, and a right side frame 106. It should be noted that although the outer contour of the mating end face 102 is similar to a rectangle, there can be transitions between the frames in various shapes such as arcs and triangles. At the same time, the outer contour lines of each frame do not have to be standard straight lines.

[0031] like Figure 2 As shown, the left side border 105 is defined as the height direction. The projection of the line connecting the maximum span between the upper side border 103 and the lower side border 104 of the hollow part of the docking end face 102 to the left corresponds to the outermost solid part of the docking end face 102. That is, the height of the projection of the line connecting the maximum span between the upper side border 103 and the lower side border 104 in the leftward direction is the height range of the left side border 105.

[0032] Define the right border 106 as the height direction. The outermost solid part of the docking end face 102 corresponds to the projection to the right of the line connecting the maximum span between the upper border 103 and the lower border 104 in the hollow part of the docking end face 102. That is, the height of the projection of the line connecting the maximum span between the upper border 103 and the lower border 104 in the rightward direction is the height range of the right border 106.

[0033] At least one threaded fastener is provided on each of the left side frame 105 and the right side frame 106 of the mating end face 102, and the hydraulic cylinder body 3 and the mating end face 102 are fixedly connected by the threaded fasteners. The plunger cavity 2 and the hydraulic cylinder body 3 are fixedly connected, and along the axis of the main shaft 7, the maximum profile dimension of the plunger cavity 2 is at least 3 / 5 greater than the minimum distance between the left side frame 105 and the right side frame 106. It should be noted that the plunger cavity 2 is usually a separate component, connected to the hydraulic cylinder body 3 by threaded fasteners. Its function is to provide a cavity for the reciprocating motion of the plunger 4 and to achieve pressurization. From the perspective of the function of the plunger cavity 2 alone, there is no particularly large interaction force generated between the plunger cavity 2 and the hydraulic cylinder body 3. The plunger cavity 2 only needs to abut against the mating surface of the hydraulic cylinder body 3, and the threaded fasteners help to resist the bending moment generated by the contact between the plunger cavity 2 and the plunger 4. Its stress condition is relatively mild, and a small number of threaded fasteners can ensure the connection strength requirements (the number of threaded fasteners is no more than 4).

[0034] However, the plunger cavity 2 has unique structural features, namely: to accommodate the plunger 4, the plunger cavity 2 has a considerable thickness along the axis of the cylindrical surface of the plunger 4 (even in a low-power high-pressure water pump, the thickness is typically greater than 40mm in a typical design). Based on theoretical mechanics, for the deformation of beams or plates, the thicker the beam or plate in the direction of flexural deformation, the stronger its resistance to deformation. For a typical rectangular cross-section beam with uniform thickness, under the condition that other parameters remain unchanged, the deformation stiffness is proportional to the cube of the beam thickness. The large thickness of the plunger cavity 2 along the axis of the cylindrical surface of the plunger 4 means that the plunger cavity 2 has very high bending stiffness in the flexural deformation state along the axis of the cylindrical surface of the plunger 4.

[0035] To meet the structural requirements of installing springs 10 in the accommodating space 101, the dimension of the plunger cavity 2 in the height direction is much smaller than that of the hydraulic cylinder 3 in the height direction; while in the horizontal direction, in addition to meeting the functional space requirements of setting the plunger hole 201, the plunger cavity 2 has a relatively large accommodating space 101 to increase the design dimension of the plunger cavity 2 in the horizontal direction.

[0036] In previous designs, such as Figure 6 and Figure 7 As shown, the threaded connection points of the hydraulic cylinder body 3 and the water pump housing 1 are located on the upper side frame 103 and the lower side frame 104, which are close to each other on the mating end face 102. The plunger cavity 2 is designed only to meet its function. In fact, although the plunger cavity 2 has high bending stiffness along the axis of the cylindrical surface of the plunger 4, due to the small height of the plunger cavity 2, even if a high-rigidity connection is adopted between the plunger cavity 2 and the hydraulic cylinder body 3, the plunger cavity 2 can only enhance the stiffness of the hydraulic cylinder body 3 in a local area in the middle of the hydraulic cylinder body 3. Therefore, the bending enhancement effect is limited. Previous designs mainly relied on the hydraulic cylinder body 3 itself to resist deformation.

[0037] In contrast, in this embodiment, firstly, the plunger cavity 2 is designed to have a sufficiently larger profile dimension along the axis of the main shaft 7, such that the maximum profile dimension of the plunger cavity 2 along the axis of the main shaft 7 is at least 3 / 5 greater than the minimum distance between the left side border 105 and the right side border 106 of the mating end face 102. Figure 5 It can be seen that the outline of the end face of the hydraulic cylinder 3 facing the plunger cavity 2 is approximately rectangular, while the long side of the plunger cavity 2 is much larger than its short side. The long side of the plunger cavity 2 is oriented in the same direction as the axis of the main shaft 7, and the short side is... Figure 5 The indicated height direction.

[0038] Second, the threaded fastener connection positions are set on the left side frame 105 and the right side frame 106 of the mating end face 102 of the water pump housing 1, and the hydraulic cylinder 3 and the mating end face 102 of the water pump housing 1 are fixedly connected by the threaded fasteners on the left side frame 105 and the right side frame 106.

[0039] Third, the connection rigidity between the plunger cavity 2 and the hydraulic cylinder 3 is increased by densely arranging threaded fasteners to enhance the connection rigidity between the hydraulic cylinder 3 and the plunger cavity 2, ensuring the consistency of deformation between the plunger cavity 2 and the hydraulic cylinder 3. Preferably, the number of threaded fasteners between the plunger cavity 2 and the hydraulic cylinder 3 is greater than or equal to 8.

[0040] In this way, the hydraulic cylinder 3 can make full use of the high deformation stiffness characteristics of the plunger cavity 2 along the cylindrical surface axis of the plunger 4 to enhance the bending resistance of the hydraulic cylinder 3, so that the deformation of the hydraulic cylinder 3 occurs in the enhanced bending stiffness mode.

[0041] After the hydraulic cylinder 3 and the plunger cavity 2 are fixed to the left side frame 105 and right side frame 106 of the water pump housing 1 by threaded fasteners, the force transmission and deformation characteristics of the hydraulic cylinder 3 will change significantly: after the force of the plunger 4 is transmitted to the hydraulic cylinder 3, the force is transmitted along the hydraulic cylinder 3 and the plunger cavity 2 to the two side frames of the water pump housing 1 in the direction along the axis of the main shaft 7. The deformation characteristic of the hydraulic cylinder 3 is that it bulges out in the middle, while the left and right ends remain fixed or undergo smaller deformation due to the action of the threaded fasteners; instead of the deformation characteristic of the hydraulic cylinder 3 bulging out in the middle and fixed at the top and bottom ends caused by the original connection method. Furthermore, because the plunger cavity 2 has a sufficiently large design size in the direction along the axis of the main shaft 7, the plunger cavity 2 can reinforce the hydraulic cylinder 3 within a considerable length range where the hydraulic cylinder 3 undergoes bending deformation, so that the reinforcing effect of the plunger cavity 2 on the bending deformation resistance of the hydraulic cylinder 3 is fully reflected.

[0042] Through calculation and analysis, the deformation of the improved cylinder body 3 does not exceed 40% of the original design, the vibration is significantly reduced, the high-pressure water plug is no longer easy to fall out, and the service life is greatly extended. Moreover, this embodiment only increases the long side dimension of the plunger cavity 2. Because the height dimension of the plunger cavity 2 is relatively small, the added component weight is limited and does not significantly increase the manufacturing cost.

[0043] In this embodiment, a plunger cavity 2 with sufficient profile length is designed to enhance the bending stiffness of the hydraulic cylinder 3 in a specific direction. Threaded fasteners are installed on the left and right side frames 106 of the mating end faces 102 of the water pump housing 1 and the hydraulic cylinder 3, and these fasteners are used to securely connect the hydraulic cylinder 3 and the water pump housing 1. Finally, the connection rigidity between the hydraulic cylinder 3 and the plunger cavity 2 is further enhanced by densely arranged threaded fasteners. Through this stiffness enhancement and connection method, the hydraulic cylinder 3 can fully utilize the high bending stiffness characteristics of the plunger cavity 2 along the cylindrical axis of the plunger 4, effectively reducing deformation under external load conditions.

[0044] It should be noted that in the original design, such as Figure 6 As shown, four threaded holes 107 are respectively provided on the upper side frame 103 and lower side frame 104 of the mating end face 102 of the hydraulic cylinder body 3 and the water pump housing 1. Each threaded hole 107 corresponds to a threaded fastener, for a total of eight threaded fasteners.

[0045] After the improvements, the bending deformation resistance of the cylinder body 3 is significantly enhanced, thus reducing the required number of threaded fasteners on the left side frame 105 and right side frame 106 of the mating end face 102 of the water pump housing 1. For example... Figure 2 As shown, the left side frame 105 and the right side frame 106 of the mating end face 102 are respectively provided with three threaded holes 107, which means that only 6 threaded fasteners are needed.

[0046] It should be noted that in this embodiment, there is no specific limitation on the number of threaded fasteners on the left side frame 105 and the right side frame 106 of the mating end face 102. Preferably, the number of threaded fasteners on the left side frame 105 and the right side frame 106 is greater than or equal to 3.

[0047] In some embodiments, such as Figure 3 As shown, the plunger cavity 2 has three plunger holes 201 along the axis of the main shaft 7, and two rows of threaded connection holes 202 are opened on the end face of the plunger cavity 2, with a total of eight threaded connection holes 202. Figure 3The three plunger holes 201 are named first plunger hole, second plunger hole, and third plunger hole from left to right. Two threaded connection holes 202 are located to the left of the first plunger hole, two between the first and second plunger holes, two between the second and third plunger holes, and the last two to the right of the third plunger hole.

[0048] That is, the eight threaded connection holes 202 are arranged in two rows and four columns to maximize the connection rigidity between the plunger cavity 2 and the hydraulic cylinder 3 and ensure the consistency of deformation between the plunger cavity 2 and the hydraulic cylinder 3.

[0049] In addition, in this embodiment, by appropriately increasing the spacing between two adjacent plunger holes 201 along the axis of the main shaft 7, both installation space for the threaded fasteners is provided and the long side dimension of the plunger cavity 2 is increased.

[0050] In some embodiments, the distance between the outermost edge of the long side of the plunger cavity 2 and the plunger hole 201 can be increased to enlarge the long side dimension. Figure 3 For example, the size of the long side of the plunger cavity 2 is increased by increasing the distance between the left side of the plunger cavity 2 and the first plunger hole, and by increasing the distance between the right side of the plunger cavity 2 and the third plunger hole.

[0051] Regarding threaded fasteners, it should be noted that for some relatively low-pressure water-lubricated high-pressure water pumps (e.g., 10 MPa pressure), the cylinder body 3 and plunger cavity 2 can be made of aluminum alloy. In this case, the cylinder body 3 and plunger cavity 2 can be manufactured as a single piece, meaning the materials used to construct the cylinder body 3 and plunger cavity 2 are continuous. In this situation, threaded fasteners are not required to connect the cylinder body 3 and plunger cavity 2.

[0052] In this embodiment, as Figure 1 As shown, the internal space formed by the connection of the hydraulic cylinder body 3 and the water pump housing 1 is the receiving space 101. The plunger cavity 2 is located in the receiving space 101. A plunger hole 201 is provided in the plunger cavity 2, and a friction-reducing layer is provided in the plunger hole 201. The plunger 4 and the plunger hole 201 cooperate to reciprocate within the plunger hole 201. An inlet check valve 9 and an outlet check valve 8 are provided inside the hydraulic cylinder body 3. The inlet check valve 9 and the outlet check valve 8 are connected to the plunger hole 201 by fluid channels. A spring 10 is installed on the end face of the hydraulic cylinder body 3 facing the plunger cavity 2. The end of the spring 10 away from the hydraulic cylinder body 3 is connected to the plunger 4 through a spring bracket 11.

[0053] Furthermore, the drive mechanism consists of an eccentric wheel shaft and thrust rings 6. The eccentric wheel shaft comprises a main shaft 7 and eccentric wheels 5 mounted on the main shaft 7. Each eccentric wheel 5 corresponds to a plunger 4, and a corresponding thrust ring 6 is fitted on the outer circumference of each eccentric wheel 5. The thrust ring 6 can rotate on the eccentric wheel 5. Under the force of the spring 10, the end face of the plunger 4 always remains in contact with the thrust ring 6.

[0054] When the eccentric wheel shaft is driven to rotate by the motor, the rotating eccentric wheel 5 drives the thrust ring 6 to also make a circular motion around the axis of the main shaft 7. When the center of the thrust ring 6 makes a circular motion and the instantaneous direction of motion approaches the direction of the hydraulic cylinder 3, the thrust ring 6 pushes the plunger 4 to move in the direction of the hydraulic cylinder 3 in the plunger hole 201 while it is abutting and rolling against the end face of the plunger 4, squeezing the water or aqueous solution in the hole. At this time, the inlet check valve 9 closes and the outlet check valve 8 opens. The water or aqueous solution is pressurized and flows through the outlet check valve 8 to be discharged from the water pump.

[0055] When the center of the thrust ring 6 makes a circular motion and its instantaneous direction of motion moves away from the hydraulic cylinder 3, the spring 10 pushes the plunger 4, causing the plunger 4 to move away from the hydraulic cylinder 3 within the plunger hole 201. Under the force of the spring 10, the thrust ring 6 still abuts against the end face of the plunger 4 and rolls. At this time, the inlet check valve 9 opens, while the outlet check valve 8 closes, and water enters the plunger hole 201 through the inlet check valve 9. The eccentric wheel 5 and the thrust ring 6 are also disposed in the receiving space 101, which is also used to fill water or an aqueous solution. The water or aqueous solution can lubricate and cool the sliding friction pair formed by the thrust ring 6 and the eccentric wheel 5, and can also lubricate and cool the sliding friction pair formed by the plunger 4 and the plunger hole 201.

[0056] 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.

[0057] 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.

[0058] 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 (3), a water pump housing (1), a plunger chamber (2), at least two plungers (4), and an eccentric wheel shaft. The hydraulic cylinder (3) is equipped with an inlet check valve (9) and an outlet check valve (8). The eccentric wheel shaft includes a main shaft (7) and an eccentric wheel (5) mounted on the main shaft (7). The plunger chamber (2) is equipped with plunger holes (201) corresponding to the plungers (4), and the plungers (4) can slide back and forth within the plunger holes (201). The water pump housing (1) is equipped with a mating end face (102) that is fixedly connected to the hydraulic cylinder (3). The internal space formed after the hydraulic cylinder (3) and the water pump housing (1) are connected is a receiving space (101). The eccentric wheel (5) is mounted within the receiving space (101), and the receiving space (101) is also used to fill water or an aqueous solution. The docking end face (102) is a hollow structure with a hollow part (108). The docking end face (102) has an upper side frame (103), a lower side frame (104), a left side frame (105) and a right side frame (106) formed around the hollow part (108) in sequence. At least one threaded fastener is provided on the left side frame (105) and the right side frame (106) of the mating end face (102), and the hydraulic cylinder body (3) and the mating end face (102) are fixedly connected by the threaded fastener. The plunger cavity (2) and the hydraulic cylinder body (3) are fixedly connected. Along the axis of the main shaft (7), the maximum outline size of the plunger cavity (2) is at least 3 / 5 of the minimum distance between the left side frame (105) and the right side frame (106).

2. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The plunger cavity (2) is fixedly connected to the hydraulic cylinder body (3) by multiple threaded fasteners.

3. A high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that, The number of threaded fasteners is greater than or equal to 4.

4. A high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that, Along the height direction of the plunger cavity (2), the threaded fasteners are provided in two rows.

5. A high-pressure water pump based on water or aqueous solution lubrication according to claim 4, characterized in that, The number of threaded fasteners in each row is greater than or equal to 4.

6. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The number of threaded fasteners on the left side frame (105) and the number of threaded fasteners on the right side frame (106) are the same and correspond one-to-one. The number of threaded fasteners on the left side frame (105) is greater than or equal to 3.

7. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The plunger cavity (2) is made of the same continuous material, and the plunger hole (201) is provided with a friction-reducing material.

8. A high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The cylinder body (3) and the plunger cavity (2) are manufactured from the same continuous material.

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