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

Abstract

A high-pressure water pump based on water or aqueous solution lubrication is characterized in that at least one side of a shell main body structure is provided with a driving mechanism mounting channel, a main shaft penetrates through the driving mechanism mounting channel in the axial direction and then is fixed to a mounting position, and the minimum size of the driving mechanism mounting channel can ensure that a thrust ring penetrates through the driving mechanism mounting channel; and a shaft seal mounting plate is arranged in the driving mechanism mounting channel. According to the utility model, the driving mechanism mounting channel is arranged on the water pump shell main body structure, the eccentric wheel shaft can be fed into the shell main body structure by utilizing the channel, and the shaft sealing mounting plate can be arranged by utilizing the channel, so that the sealing problem of water in the accommodating space is solved with low cost, and the bearing is protected; meanwhile, the driving mechanism mounting channel can be further used for mounting a bearing, so that the water pump shell and an internal structure thereof are convenient to assemble.

Description

Technical Field

[0001] This utility model relates to a high-pressure water pump based on water or aqueous solution lubrication. Background Technology

[0002] Water-lubricated high-pressure water pumps use water or aqueous solutions for lubrication, eliminating the need for lubricating oil. This makes them environmentally friendly and maintenance-free, representing an ideal form of green power. While commercially available water-lubricated high-pressure water pumps can boost the output pressure of water or aqueous solutions, their output pressure is relatively low, their resistance to contamination is poor, and they are expensive. These drawbacks limit the widespread application of water-lubricated high-pressure water pumps.

[0003] As described in patent ZL202321748626.7, the newly developed water-lubricated high-pressure water pump utilizes a thrust ring fitted on an eccentric wheel shaft. During the rolling contact between the thrust ring and the plunger's contact surface, the thrust ring drives the plunger to move within the plunger cavity, thus pressurizing water or an aqueous solution. This pump also lubricates and cools the moving mechanism using water or an aqueous solution. Benefiting from its hydrostatic support-free structural design, the patented technology can provide significantly higher pressures compared to traditional water-lubricated high-pressure water pumps, and therefore holds promise for wider application.

[0004] The housing is a crucial component of a high-pressure water pump, accounting for a significant portion of its manufacturing cost. Because a drive mechanism is rotatably connected to the housing, exerting considerable force on it, the housing must possess excellent rigidity and strength, ensuring high rotational accuracy of the assembled drive mechanism. Furthermore, ease of assembly and disassembly is a critical consideration in the housing's structural design. Therefore, a good high-pressure water pump housing must meet stringent requirements, including high rigidity, high strength, high precision, simple structure, low manufacturing cost, and excellent ease of assembly and disassembly—achieving all these is no easy feat.

[0005] The water-lubricated high-pressure water pump described in patent ZL202321748625.7 uses rolling bearings made of traditional bearing steel to support the eccentric shaft on both sides. This requires the rolling bearings to precisely fix the drive mechanism to the housing structure. To prevent corrosion of the rolling bearings by water or aqueous solutions inside the housing, the bearings need protection. This necessitates creating a separate, sealed bearing support space within the housing structure, independent of the water-containing space inside the housing. Furthermore, it requires ensuring high strength, rigidity, low-cost manufacturing, high precision installation of the drive mechanism, and excellent ease of installation and disassembly. In contrast, traditional oil-lubricated high-pressure water pumps use the same space for both the lubricating oil and the bearing installation, eliminating sealing issues and making manufacturing and assembly much easier.

[0006] Initially, the inventor used a shell structure divided into two symmetrical parts, fixed together by threaded fasteners along the dividing line. Each half of the shell had bearing mounting holes machined and fitted onto both sides of the eccentric wheel shaft, forming a single unit when closed. This design facilitated manufacturing and provided independent, mutually sealed water-containing and bearing mounting spaces, while also offering convenient assembly. However, the non-uniform manufacturing of the main shell structure reduced its rigidity, and the assembly process also led to decreased concentricity accuracy of the bearings on both sides. These issues compelled the inventor to continue improving the design and propose a better solution. Utility Model Content

[0007] (a) Technical issues:

[0008] To address the requirements of high-precision installation of the drive mechanism in a novel water-lubricated high-pressure water pump, while preventing corrosion of the rolling bearings by water inside the housing, this utility model aims to solve the design problem of the housing, ensuring that the designed housing meets the requirements of high strength, rigidity, and low-cost manufacturing, as well as high precision of the rotary connection of the drive mechanism and excellent ease of installation and disassembly.

[0009] (II) Technical Solution:

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] This utility model provides a high-pressure water pump based on water or aqueous solution lubrication. In this utility model, the high-pressure water pump based on water or aqueous solution lubrication includes: a cylinder body, a housing, a plunger cavity, at least one plunger, a drive mechanism, a rolling bearing, and a shaft seal mounting plate.

[0012] The liquid cylinder is equipped with an inlet check valve and an outlet check valve.

[0013] The drive mechanism includes an eccentric wheel shaft and a thrust ring. The eccentric wheel shaft includes a main shaft and an eccentric wheel disposed on the main shaft. The thrust ring is disposed on the eccentric wheel.

[0014] The plunger cavity is provided with plunger holes corresponding to the plungers one by one, and the plungers can slide back and forth in the plunger holes;

[0015] The housing includes a main housing structure, the hydraulic cylinder is fixedly connected to the main housing structure, and the internal space formed after the hydraulic cylinder and the main housing structure are connected is a receiving space. The eccentric wheel and the thrust ring are arranged in the receiving space, and the receiving space is also used to fill water or an aqueous solution.

[0016] The eccentric wheel shaft is rotated and supported by the rolling bearing;

[0017] The main body of the housing has a drive mechanism mounting channel on at least one side. The main shaft passes through the drive mechanism mounting channel and enters the main body of the housing, where it is fixed to the mounting position. The minimum size of the drive mechanism mounting channel is sufficient to allow the thrust ring to pass through.

[0018] The shaft seal mounting plate is a hollow structure and is sleeved on the outer circumference of the main shaft. The shaft seal mounting plate is provided with a rotary sealing structure, which is used to achieve a seal between the shaft seal mounting plate and the rotating main shaft to prevent water or aqueous solution in the accommodating space from flowing out of the main housing structure. A static sealing structure is provided between the shaft seal mounting plate and the main housing structure to prevent water or aqueous solution in the accommodating space from flowing out of the main housing structure through the gap between the shaft seal mounting plate and the main housing structure.

[0019] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, the installation of the drive mechanism is carried out by first sending the main shaft into the housing body structure along the drive mechanism installation channel, further completing the assembly of the eccentric wheel and the thrust ring on the main shaft, and after the shaft seal mounting plate enters the drive mechanism installation channel, the rolling bearing is then press-fitted onto the eccentric wheel shaft.

[0020] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, the outer ring of the rolling bearing is directly sleeved in the drive mechanism mounting channel.

[0021] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, the outer ring of the rolling bearing is mounted on a bearing mounting seat, and the bearing mounting seat is fixedly connected to the main body structure of the housing.

[0022] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, after all the eccentric wheels are installed on the main shaft and all the thrust rings are fitted onto the corresponding outer circumferential surfaces of the eccentric wheels, the drive mechanism is inserted into the installation position inside the main body structure of the housing through the drive mechanism installation channel to realize the installation of the drive mechanism.

[0023] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, a water-retaining ring is provided on the eccentric wheel shaft. The water-retaining ring is disposed between the shaft seal mounting plate and the rolling bearing. The water-retaining ring is used to prevent water or aqueous solution leaked by the rotary seal structure from flowing along the eccentric wheel shaft into the rolling bearing.

[0024] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, a drain hole is provided on the drive mechanism mounting channel, and water leaked by the rotary sealing structure is discharged from the housing body structure through the drain hole.

[0025] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, a waterproof and dustproof sealing ring is installed on the eccentric wheel shaft to prevent water and dust from outside the high-pressure water pump from entering the rolling bearing.

[0026] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, the shaft seal mounting plate and the bearing mounting seat are manufactured as a single unit.

[0027] Preferably, in the high-pressure water pump based on water or aqueous solution lubrication provided by this utility model, a front cover is provided at the front end of the main body of the housing, the front end of the eccentric wheel shaft passes through the front cover, and a rear cover is provided at the rear end of the main body of the housing, the rear cover being used to close the rear end of the main body of the housing.

[0028] (III) Beneficial Effects:

[0029] As described above, this utility model provides a high-pressure water pump based on water or aqueous solution lubrication, with a drive mechanism mounting channel provided on its main housing structure. The combination of the drive mechanism mounting channel and the shaft seal mounting plate facilitates functions such as inserting the eccentric wheel shaft into the main housing structure, waterproof sealing of the bearing mounting space, drainage of leaked water from the rotary seal, and high-precision bearing installation. The main housing structure is simple, has low processing costs, good rigidity and strength, is easy to assemble, and can meet the high rotational accuracy installation requirements of the drive mechanism. Due to these advantages, this housing structure can well meet the commercialization requirements of this new water pump. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0031] Figure 1 This is a cross-sectional structural schematic diagram of a high-pressure water pump based on water or aqueous solution lubrication in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0033] Figure 3 for Figure 2 Cross-sectional view along the middle AA;

[0034] Figure 4 This is a cross-sectional structural diagram of an embodiment of the present invention in which an eccentric wheel shaft or similar structure is installed inside the housing;

[0035] Figure 5 This is a cross-sectional structural diagram of another embodiment of the present invention, in which an eccentric wheel shaft or similar structure is installed inside the housing;

[0036] Figure 6 This is a schematic diagram of the eccentric wheel shaft in one embodiment of the present invention, where a combined structure is used.

[0037] in, Figure 4 and Figure 5 For different embodiments Figure 1 A cross-sectional view along the middle BB. Specifically, in Figure 4 In the middle, the bearing mounting base and the shaft seal mounting plate are separate structures; Figure 5 In this design, the bearing mounting base and the shaft seal mounting plate are an integrated structure.

[0038] exist Figures 1 to 6 In the diagram, the correspondence between component names and reference numerals is as follows:

[0039] 1. Hydraulic cylinder body; 2. Main housing structure; 3. Plunger cavity; 4. Plunger hole; 5. Plunger; 6. Inlet check valve; 7. Outlet check valve; 8. Accommodation space; 9. Spring frame; 10. Eccentric wheel shaft; 11. Eccentric wheel; 12. Thrust ring; 13. Shaft seal mounting plate; 14. Rolling bearing; 15. Bearing mounting seat; 16. Water baffle ring; 17. Drain hole; 18. Static sealing structure; 19. Rotary sealing structure; 20. Waterproof and dustproof sealing structure; 21. Front end cover; 22. Rear end cover; 23. Drive mechanism mounting channel; 24.

[0040] exist Figure 4 , Figure 5 and Figure 6 In the eccentric wheel and shaft type 11, it is divided into: the first structural type (reflected in...) Figure 4 and Figure 5 The first type is a semi-integral, semi-combined eccentric wheel shaft, including an integral eccentric wheel 12a and a combined eccentric wheel 12b; the second type of structure (embodied in...) Figure 6 (Middle), namely, the combined eccentric wheel and shaft, including the eccentric wheel 12c with an independent structure. Detailed Implementation

[0041] 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 of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. 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 present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0042] In the description of this utility model, 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 this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected" and "linked" used in this utility model 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.

[0043] Please refer to Figures 1 to 6This utility model provides a high-pressure water pump based on water or aqueous solution lubrication, comprising: a hydraulic cylinder body 1 (also called a pump head), a housing, a plunger cavity 3, at least two plungers 5, a drive mechanism, and a rolling bearing 15. The hydraulic cylinder body 1 and the plunger cavity 3 are fixedly connected (i.e., the hydraulic cylinder body 1 and the plunger cavity 3 are two independent structural components) or integrally molded. The water pump housing includes a main housing structure 2, a bearing mounting seat 16, and end covers (there are two end covers, namely a front end cover 22 and a rear end cover 23, with a waterproof and dustproof sealing structure 21 between the front end cover 22 and the front bearing to prevent external water and dust from entering, and the rear end cover 23 to seal the tail bearing and the end of the eccentric wheel shaft), etc., wherein the main housing structure 2 serves to accommodate the water pump parts such as the plunger cavity 3, the plungers 5, and the drive mechanism. The cylinder body 1 and the main housing structure 2 are also fixedly connected together. The internal space formed after the cylinder body 1 and the main housing structure 2 are connected is the receiving space 8. The plunger cavity 3 is located in the receiving space 8. The plunger cavity 3 is provided with a plunger hole 4. The plunger 5 cooperates with the plunger hole 4, and the plunger 5 can reciprocate in the plunger hole 4. The cylinder body 1 is provided with an inlet check valve 6 and an outlet check valve 7. The inlet check valve 6 and the outlet check valve 7 are connected to the plunger hole 4 by a fluid channel (a channel structure provided on the cylinder body 1). The drive mechanism consists of an eccentric wheel shaft 11 and a thrust ring 13. The eccentric wheel shaft 11 consists of a main shaft and an eccentric wheel 12 provided on the main shaft. The eccentric wheel 12 corresponds to the plunger 5 one by one. Each eccentric wheel 12 is fitted with a corresponding thrust ring 13 on its outer circumference. The thrust ring 13 can rotate on the eccentric wheel 12. Under the action of spring force (spring frame 10 is connected to plunger 5, thus providing spring force to plunger 5), the end face of plunger 5 always remains in contact with thrust ring 13. When eccentric wheel shaft 11 is driven to rotate by motor, the rotating eccentric wheel 12 drives the center of thrust ring 13 to also make circular motion around the main shaft axis. When the center of the thrust ring 13 makes a circular motion and the direction of motion approaches the direction of the hydraulic cylinder 1, the thrust ring 13 pushes the plunger 5 in the plunger hole 4 towards the direction of the hydraulic cylinder 1 while it is in contact with and rolling against the end face of the plunger 5, squeezing the water or aqueous solution in the hole. At this time, the inlet check valve 6 is closed and the outlet check valve 7 is opened. The water or aqueous solution is pressurized and flows through the outlet check valve 7 to be discharged from the water pump. When the center of the thrust ring 13 makes a circular motion and the direction of motion moves away from the hydraulic cylinder 1, the spring 9 pushes the plunger 5, causing the plunger 5 to move away from the hydraulic cylinder 1 in the plunger hole 4. Under the action of the spring force, the thrust ring 13 is still in contact with the end face of the plunger 5 and rolls. At this time, the inlet check valve 6 is opened and the outlet check valve 7 is closed. Water enters the plunger hole 4 through the inlet check valve 6. The eccentric wheel 12 and the thrust ring 13 are also disposed in the receiving space 8, which is also 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 5 and the plunger hole 4.

[0044] The eccentric wheels 12 mounted on the eccentric shaft 11 are typically three in number, and can be either a combined eccentric shaft or a semi-combined / semi-integral eccentric shaft structure. The structure of the combined eccentric shaft is as follows: Figure 6 As shown, when manufacturing the combined eccentric wheel shaft 11, the eccentric wheel 12 and the main shaft of the eccentric wheel shaft 11 are manufactured independently and then press-fitted together. Patent ZL202321748625.7 describes a semi-combined, semi-integral eccentric wheel shaft 11 structure (e.g.) Figure 4 and Figure 5 As shown), based on the structure disclosed in the patent, at least the eccentric wheel 12 (which is an integral eccentric wheel 12a) and the main shaft of the eccentric wheel shaft 11, which are located in the middle position, are integrally machined from a continuous material. At least one eccentric wheel 12 (which is a combined eccentric wheel 12b) of the eccentric wheel shaft 11 is fixedly installed by being sleeved on the main shaft of the eccentric wheel shaft 11.

[0045] The main body structure 2 is hollow with an open front end. The hydraulic cylinder 1 is fixedly connected to the main body structure 2 at the mating end face by threaded fasteners. Because the force of the drive mechanism and the hydraulic cylinder 1 is ultimately transmitted to the main body structure 2, the main body structure 2 has relatively high requirements for rigidity and strength. It is preferable that the main body structure 2 is manufactured as a single piece. Preferably, the main body structure 2 is designed to be symmetrical, that is, there is a symmetrical central plane on the main body structure 2 in the direction perpendicular to the axis of the eccentric wheel shaft 11. The main body structure 2 is symmetrical with respect to this plane (preferably, this plane is located at the position of the eccentric wheel 12 in the middle of the three eccentric wheels 12). The rear side walls of the main body structure 2 are provided with drive mechanism mounting channels 24 (through the main body structure 2). The drive mechanism mounting channels 24 can be composed of multiple holes of different sizes and shapes, or they can be realized by a single diameter through hole. Preferably, the drive mechanism mounting channels 24 are single diameter through holes and are symmetrically opened on both sides with the symmetrical plane of the shell as the center. This design allows the symmetrical drive mechanism mounting channels 24 on both sides to be machined in one go during the fabrication of the main shell structure 2, ensuring high concentricity of the drive mechanism mounting channels 24 and achieving high-precision installation and fixation of the drive mechanism.

[0046] The eccentric wheel shaft 11 can be axially fed into the predetermined installation position through the drive mechanism mounting channels 24 on both sides of the housing body structure 2.

[0047] The size of the drive mechanism mounting channel 24 affects the rigidity and external dimensions of the housing body structure 2. Increasing the size of the drive mechanism mounting channel 24 reduces the rigidity of the housing body structure 2 and increases its external dimensions, but increases the ease of assembly. Conversely, decreasing the size of the drive mechanism mounting channel 24 increases the rigidity of the housing body structure 2 and decreases its external dimensions, but reduces the ease of assembly.

[0048] Based on the structural features of the eccentric wheel shaft 11, the eccentric wheel shaft 11 can be installed inside the main body structure 2 of the housing in the following ways:

[0049] 1. This method is suitable for mounting the combined eccentric wheel shaft 11, and can use the smallest possible drive mechanism mounting channel. The specific implementation method is as follows:

[0050] After the main shaft of the eccentric wheel shaft 11 is inserted into the main body structure 2 of the housing through the drive mechanism mounting channel 24, the eccentric wheel 12c and the thrust ring 13 are then fed into the main body structure of the housing through the drive mechanism mounting channel 24 and installed sequentially. When using this method, the minimum inner diameter of the drive mechanism mounting channel 24 needs to be greater than the outer diameter of the thrust ring 13, that is, the minimum size of the drive mechanism mounting channel 24 can ensure that the thrust ring 13 can pass through.

[0051] 2. This method is suitable for semi-integral / semi-combined eccentric wheel shafts and combined eccentric wheel shafts. This method requires a larger diameter drive mechanism mounting channel 24. The specific implementation method is as follows:

[0052] For the semi-integral, semi-combined eccentric wheel shaft, firstly, the thrust ring 13 corresponding to the eccentric wheel 12a at the center position is assembled, and the eccentric wheel 12b is installed on the main shaft of the eccentric wheel shaft 11. Then, the eccentric wheel shaft 11 is sent into the housing body structure 2 through the drive mechanism installation channel 24. Further, the remaining thrust ring 13 is sent into the housing through the drive mechanism installation channel 24 and assembled.

[0053] For the combined eccentric wheel shaft, firstly, the eccentric wheels 12c are assembled on the main shaft and the thrust ring 13 in the middle is assembled on the middle eccentric wheel shaft. Then, the eccentric wheel shaft 11 is sent into the housing body structure 2 through the drive mechanism mounting channel 24. The remaining thrust ring 13 is then sent into the housing through the drive mechanism mounting channel 24 and assembled.

[0054] 3. This method is suitable for semi-integral / semi-combined eccentric wheel shafts and combined eccentric wheel shafts. This method requires setting up a drive mechanism mounting channel 24 with the largest diameter. The specific implementation method is as follows:

[0055] For semi-integral semi-combined eccentric wheel shafts and combined eccentric wheel shafts, after completing the installation of all eccentric wheels 12 on the main shaft of the eccentric wheel shaft 11 and fitting all thrust rings 13 onto the outer circumferential surface of the corresponding eccentric wheel 12, the eccentric wheel shaft 11 is inserted into the interior of the main body structure 2 of the housing along the axial direction through the drive mechanism installation channel 24.

[0056] The shell structure designed using Method 1 is easier to achieve in terms of smaller shell size and better structural rigidity and strength, but its assembly performance is poor. Conversely, the shell structure designed using Method 3 has the largest size and requires more shell material for reinforcement, but its assembly convenience is the best. The shell structure designed using Method 2 has advantages and disadvantages that fall between those of Method 1 and Method 3.

[0057] To improve assembly efficiency, it is preferable to install all eccentric wheels 12 and thrust rings 13 on the main shaft of eccentric wheel shaft 11, and then set the entire drive mechanism consisting of eccentric wheel shaft 11 and thrust rings 13 axially to the predetermined installation position through the drive mechanism installation channel 24.

[0058] After the drive mechanism is installed inside the housing body structure 2 via the drive mechanism installation channel 24 using the three methods described above, the inner hole of the shaft seal mounting plate 14 passes through the eccentric wheel shaft 11, enters along the drive mechanism installation channel 24, and is fixed in the installation position. The shaft seal mounting plate 14 is a hollow structure, preferably an annular structure, and the inner hole of the shaft seal mounting plate 14 is larger than the enclosed eccentric wheel shaft 11. A rotary sealing structure 20 is provided on the shaft seal mounting plate 14 for sealing between the shaft seal mounting plate 14 and the main shaft of the rotating eccentric wheel shaft 11. Sealing structures that can be used between the shaft seal mounting plate 14 and the main shaft of the eccentric wheel shaft 11 include mechanical seals and skeleton seals, with mechanical seals being preferred. Mechanical seals have a longer service life and structural reliability. Unlike other sealing structures, they consist of a rotating ring installed on the main shaft of the eccentric wheel shaft 11 and a stationary ring installed on the shaft seal mounting plate 14. Therefore, the rotary sealing structure 20 provided on the shaft seal mounting plate 14, for mechanical seals, specifically refers to the stationary ring of the mechanical seal. For other sealing structures, it refers to the entire sealing structure. The shaft seal mounting plate 14 is fixed inside the housing main structure 2, preferably fixedly connected within the drive mechanism mounting channel 24. A static seal structure 21 is provided between the shaft seal mounting plate 14 and the housing main structure 2 to ensure that water or aqueous solution inside the housing does not leak from the gap between the shaft seal mounting plate 14 and the housing main structure 2; preferably, the static seal structure 21 is located between the shaft seal mounting plate 14 and the drive mechanism mounting channel 24. The preferred static seal structure 21 is an O-ring, using a radial sealing method, which has the simplest structure. When the drive mechanism mounting channel 24 consists of multiple holes of different sizes, with steps between the holes, axial sealing can also be achieved by using the steps and the axial contact of the shaft seal mounting plate 14 (with the hole centerline as the axis) to set an O-ring (static seal structure 21). To ensure the connection reliability of the shaft seal mounting plate 14, the shaft seal cover can be fixed to the housing main structure 2 by screws or pins along the radial direction of the eccentric wheel shaft 11. The shaft seal mounting plate has a simple structure, can effectively waterproof and isolate the internal accommodating space and the bearing accommodating space, and can be easily assembled.

[0059] After the shaft seal mounting plate 14 is installed, the water baffle ring 17 needs to be installed. The shaft seal mounting plate 14 and the water baffle ring 17 are installed at each end of the eccentric wheel 12 (three eccentric wheels 12). During pump operation, the rotary seal structure 20 on the shaft seal mounting plate 14 may produce a small amount of leakage. This leakage will flow along the eccentric wheel shaft 11 towards the bearing, posing a potential hazard of bearing corrosion. The water baffle ring 17 is fixed to the eccentric wheel shaft 11. A seal between the water baffle ring 17 and the eccentric wheel shaft 11 is preferably achieved through an interference fit. The water baffle ring 17 is positioned between the rotary seal structure 20 and the bearing, with a certain gap between them. This gap is slightly larger than the thickness of the water baffle ring 17, allowing the water baffle ring 17 to rotate within this gap, preventing leaked water or aqueous solution from flowing along the shaft to the bearing. During operation, the water-blocking ring 17 rotates at high speed, throwing the water flowing onto the water-blocking ring 17 radially out and flowing out through the drain hole 18 provided on the main body structure 2 of the housing (the drain hole 18 is provided corresponding to the water-blocking ring 17 and communicates with the gap between the rotary sealing structure 20 and the bearing).

[0060] After the water-retaining ring 17 is installed, the next step is to install the bearing. The bearings used are preferably deep groove ball bearings and / or tapered roller bearings, lubricated with grease. When using deep groove ball bearings, if the designed drive mechanism mounting channel 24 hole and the bearing outer diameter are the same, the bearing can be directly installed in the drive mechanism mounting channel 24; when the drive mechanism mounting channel 24 hole and the bearing outer diameter are different, the bearing mounting seat 16 can be used for installation. The bearing mounting seat 16 has an outer surface that mates with the drive mechanism mounting channel 24 hole and an inner surface that mates with the bearing outer diameter. When using tapered roller bearings, the outer diameter of the tapered roller bearing is relatively small, requiring the outer ring of the tapered roller bearing to be fixed on the bearing mounting seat 16 for installation.

[0061] It should be further noted that, for deep groove ball bearing applications, the shaft seal mounting plate 14 and the bearing mounting seat 16 can also be manufactured as a single unit, while their respective functions remain unchanged. For example... Figure 5 As shown, the shaft seal mounting plate 14 and the bearing mounting seat 16 can be connected together by a ring structure (a connection structure set between the shaft seal mounting plate 14 and the bearing mounting seat 16). For this application, a drainage channel needs to be added to the integrated structure corresponding to the position of the drainage hole 18 on the main body structure 2 to ensure that the water leaked from the rotary seal structure 20 flows out.

[0062] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-pressure water pump based on water or aqueous solution lubrication, characterized in that, include: The cylinder body, housing, plunger chamber, at least one plunger, drive mechanism, rolling bearing, and shaft seal mounting plate; The liquid cylinder is equipped with an inlet check valve and an outlet check valve. The drive mechanism includes an eccentric wheel shaft and a thrust ring. The eccentric wheel shaft includes a main shaft and an eccentric wheel disposed on the main shaft. The thrust ring is disposed on the eccentric wheel. The plunger cavity is provided with plunger holes corresponding to the plungers one by one, and the plungers can slide back and forth in the plunger holes; The housing includes a main housing structure, the hydraulic cylinder is fixedly connected to the main housing structure, and the internal space formed after the hydraulic cylinder and the main housing structure are connected is a receiving space. The eccentric wheel and the thrust ring are arranged in the receiving space, and the receiving space is also used to fill water or an aqueous solution. The eccentric wheel shaft is rotated and supported by the rolling bearing; The main body of the housing has a drive mechanism mounting channel on at least one side. The main shaft passes through the drive mechanism mounting channel and enters the main body of the housing, where it is fixed to the mounting position. The minimum size of the drive mechanism mounting channel is sufficient to allow the thrust ring to pass through. The shaft seal mounting plate is a hollow structure and is sleeved on the outer circumference of the main shaft. The shaft seal mounting plate is provided with a rotary sealing structure, which is used to achieve a seal between the shaft seal mounting plate and the rotating main shaft to prevent water or aqueous solution in the accommodating space from flowing out of the main housing structure. A static sealing structure is provided between the shaft seal mounting plate and the main housing structure to prevent water or aqueous solution in the accommodating space from flowing out of the main housing structure through the gap between the shaft seal mounting plate and the main housing structure.

2. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The installation of the drive mechanism is performed by first sending the main shaft into the housing body structure along the drive mechanism installation channel, then assembling the eccentric wheel and the thrust ring on the main shaft, and finally pressing the rolling bearing onto the eccentric wheel shaft after the shaft seal mounting plate enters the drive mechanism installation channel.

3. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The outer ring of the rolling bearing is directly fitted into the drive mechanism mounting channel.

4. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The outer ring of the rolling bearing is mounted on a bearing mounting base, which is fixedly connected to the main body structure of the housing.

5. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, A water-blocking ring is provided on the eccentric wheel shaft. The water-blocking ring is located between the shaft seal mounting plate and the rolling bearing. The water-blocking ring is used to prevent water or aqueous solution leaked from the rotary seal structure from flowing along the eccentric wheel shaft into the rolling bearing.

6. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, A drain hole is provided on the drive mechanism mounting channel, and water leaked by the rotary sealing structure is discharged from the main body of the housing through the drain hole.

7. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that, The eccentric wheel shaft is equipped with a waterproof and dustproof sealing ring to prevent water and dust from outside the high-pressure water pump from entering the rolling bearing.

8. The high-pressure water pump based on water or aqueous solution lubrication according to claim 4, characterized in that, The shaft seal mounting plate and the bearing mounting base are manufactured as a single unit.

9. The high-pressure water pump based on water or aqueous solution lubrication according to any one of claims 1 to 8, characterized in that, A front cover is provided at the front end of the main body of the housing, and the front end of the eccentric wheel shaft passes through the front cover. A rear cover is provided at the rear end of the main body of the housing, and the rear cover is used to close the rear end of the main body of the housing.

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