Double-cylinder high-pressure water pump

Abstract

The present invention relates to the field of water pumps. Provided is a double-cylinder high-pressure water pump, comprising: a crankcase; a double-cylinder mechanism mounted in the crankcase and comprising a power shaft and a plunger which are arranged in the crankcase, wherein an eccentric shaft is provided at the top of the power shaft, a bearing is provided on the eccentric shaft, the plunger is provided with an accommodating groove, and the eccentric shaft and the bearing thereon are both arranged in the accommodating groove; and a water flow passage arranged on the crankcase and comprising two high-pressure chambers, wherein each high-pressure chamber is connected to a water inlet passage and a water outlet passage, water inlet ends of the two water inlet passages are connected to one water inlet, the two water outlet passages merge into a single high-pressure water outlet passage, and each of the water inlet passages and each of the water outlet passages is provided with a check valve. The crankcase is provided with a water cooling chamber in communication with the water inlet passages and surrounding the power shaft. The present invention uses a mechanism in which the eccentric shaft and the bearing control the reciprocating movement of the plunger instead of a conventional crank-and-connecting-rod transmission mechanism, thereby simplifying the power transmission structure, improving the energy utilization efficiency, and reducing space occupation.

Description

Twin-cylinder high-pressure water pump Technical Field

[0001] This invention relates to the field of high-pressure water pump technology, specifically to a dual-cylinder high-pressure water pump. Background Technology

[0002] Currently, a known high-pressure plunger water pump consists of a plunger, a suction valve, a discharge valve, and a crank-connecting rod mechanism. The plunger reciprocates under external force to change the volume and pressure within the working chamber. Multiple plungers / pistons are arranged in parallel and reciprocate in the same direction. When a negative pressure is created within the working chamber, liquid enters through the suction valve. The reciprocating motion of the plunger opens and closes, and the suction and discharge valves change the volume within the working chamber, generating pressure that forces the liquid to exit through the discharge valve.

[0003] Existing crank-connecting rod type piston pumps often have the following problems:

[0004] 1. The transmission between external force and plunger adopts a crank-connecting rod mechanism, which has a complex structure, large energy loss, and the linkage structure of crank and connecting rod occupies a large space, resulting in a large overall volume of pump body.

[0005] 2. Lack of effective cooling devices. Existing crank-connecting rod mechanism plunger pumps mostly rely on the heat sink structure on the crank-connecting rod mounting box for heat dissipation, which has poor heat dissipation effect. Alternatively, they may use a single-channel cooling water flow structure on the crank-connecting rod mounting box for heat dissipation, but this cannot achieve the efficient cooling effect of overall enclosed water cooling.

[0006] 3. The existing crank-connecting rod mechanism plunger pump has a complex assembly structure, which is time-consuming and labor-intensive to disassemble and assemble, and is not convenient for maintenance.

[0007] Chinese patent with publication number CN106224192A discloses a crankshaft-type double piston high-pressure pump, which uses a crank-connecting rod mechanism to drive the reciprocating motion of the piston. The crank-connecting rod mechanism has a complex structure, high energy loss, and large space occupation.

[0008] Therefore, there is an urgent need to develop a new type of power transmission structure to achieve efficient energy transmission, self-cooling, and a long effective service life while maintaining low energy consumption and high efficiency, and to extend the maintenance cycle and reduce maintenance costs. Technical solutions

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art. The present invention provides a dual-cylinder water pump that replaces the traditional crankshaft crank and connecting rod connection for power transmission. It solves the problem of power consumption superposition of the power source in the traditional crank-connecting rod structure, increases the effective working efficiency, and has a highly efficient cooling structure that can achieve full-enclosed cooling of the crankcase when the machine is turned on. It realizes a dual-cylinder high-pressure pump that can fully cool itself by using water intake.

[0010] This invention aims to solve the shortcomings of existing high-pressure pumps, such as the traditional crankshaft and connecting rod power output structure, pump body temperature rise, overlapping power loss, and large pump body size. This invention provides a dual-cylinder high-pressure water pump that replaces the traditional crankshaft and connecting rod driven dual-cylinder pump body, uses water intake for self-cooling, reduces power loss, has a small size, and is suitable for narrow areas.

[0011] A dual-cylinder high-pressure water pump, including:

[0012] Crankcase;

[0013] A twin-cylinder mechanism, installed in a crankcase, includes a power shaft for power input that rotates around its own axis and a plunger that reciprocates linearly controlled by the power shaft. An eccentric shaft is provided at the top of the power shaft, and a bearing is sleeved on the eccentric shaft. A receiving groove is provided on the bottom side of the middle part of the plunger. The eccentric shaft and the bearing on the eccentric shaft are both located in the receiving groove. The crankcase is provided with a channel for the movement and directional holding of the plunger, and the two ends of the plunger can move within the channel.

[0014] The water flow channel, located on the crankcase, includes two water inlet channels branching from a single inlet, a single high-pressure outlet channel formed by the convergence of the two outlet channels, and two high-pressure chambers. The two high-pressure chambers are located on the crankcase and at the two ends of the plunger, respectively. Each high-pressure chamber has an inlet channel connected to its inlet end and an outlet channel connected to its outlet end. Each inlet channel and each outlet channel is equipped with a one-way valve. The one-way valve on the inlet channel controls the water flow to flow only from the inlet to the high-pressure chamber, and the one-way valve on the outlet channel controls the water flow to flow only from the high-pressure chamber to the high-pressure outlet channel.

[0015] The rotation of the power shaft controls the reciprocating movement of the plunger via the eccentric shaft and the bearings on the eccentric shaft. The plunger end enters and exits the high-pressure chamber, controlling the water inlet and outlet of the high-pressure chamber. When the plunger end moves away from the high-pressure chamber, water enters the high-pressure chamber through the water inlet channel, and water exits the high-pressure chamber through the water outlet channel.

[0016] Furthermore, a water-cooled chamber is provided between the water inlet and the two water inlet channels. The water-cooled chamber is arranged around the power shaft, and the water inlet is located on the water-cooled chamber. The two water inlet channels are respectively connected to the water-cooled chamber. The water-cooled chamber is arranged around the power shaft to provide a full-enclosed cooling function.

[0017] Furthermore, the crankcase includes a crankcase housing, two high-pressure chamber housings and a high-pressure water outlet housing. The two high-pressure chamber housings are respectively connected to both sides of the crankcase housing, and the high-pressure water outlet housing is located above the crankcase housing and its two ends are respectively connected to one of the high-pressure chamber housings.

[0018] The crankcase is provided with a power shaft placement cavity, and the crankcase is provided with a first plunger channel located on both sides of the power shaft placement cavity and communicating with the power shaft placement cavity.

[0019] The high-pressure chamber is provided inside the high-pressure chamber shell. The high-pressure chamber has a first water outlet channel at the water outlet end and a first water inlet channel at the water inlet end. A second plunger channel communicating with the high-pressure chamber is provided inside the high-pressure chamber shell near the crankcase shell.

[0020] The plunger is movable within the first plunger channel and the second plunger channel. A wear-resistant bushing is fixedly fitted onto the plunger within the first plunger channel. An oil seal is provided between the end of the wear-resistant bushing away from the power shaft placement cavity and the plunger. A secondary water seal bracket, a main water seal, and a secondary water seal are fixedly fitted onto the plunger within the second plunger channel. The main water seal is located at the end of the secondary water seal bracket near the high-pressure chamber, and the secondary water seal is located at the end of the secondary water seal bracket near the wear-resistant bushing.

[0021] The high-pressure water outlet shell is provided with a high-pressure water outlet channel. The inlet end of the high-pressure water outlet channel is connected to two second water outlet channels. The inlet of each second water outlet channel is connected to the corresponding first water outlet channel.

[0022] The crankcase is provided with a second water inlet channel that communicates with the water cooling chamber, and the second water inlet channel is connected to the first water inlet channel.

[0023] One-way valves are installed at the inlet of the second water outlet channel on the high-pressure outlet shell and at the inlet of the first water inlet channel on the high-pressure chamber shell.

[0024] Furthermore, the one-way valve includes a valve cap and a valve body. The valve cap is connected to the water inlet end of the valve body. The valve cap has a through-hole forming a water inlet. The valve body has an outlet hole on its side wall. The valve body contains a valve plate and a spring.

[0025] The valve body includes a mating ring, and the valve cap is connected to the mating ring. A plurality of support columns are evenly distributed on the side of the mating ring away from the valve cap. A valve plate limiting ring and a spring limiting ring are provided on the inner side of the plurality of support columns and connected to the support columns. The diameter of the spring limiting ring is smaller than the diameter of the valve plate limiting ring. The valve plate limiting ring is located between the spring limiting ring and the mating ring. The valve plate is located between the valve plate limiting ring and the valve cap. The spring is located between the spring limiting ring and the valve plate. One end of the spring abuts against the valve plate, and the other end abuts against the spring limiting ring. A reinforcing rib is provided between the end of the support column away from the mating ring and the spring limiting ring.

[0026] The water outlet is located between the valve plate limiting ring and the docking ring. The valve plate moves between the valve plate limiting ring and the valve cap to control the opening and closing of the water outlet. The space between two adjacent support columns is connected to the water outlet to form a main flow channel.

[0027] Furthermore, the water-cooled chamber includes a water storage ring groove located on the outer side of the bottom end of the crankcase and a water jacket sleeved on the outer side of the water storage ring groove. Sealing rings are provided between the top and bottom ends of the inner wall of the water jacket and the crankcase.

[0028] Furthermore, the power shaft is disposed in the power shaft placement cavity, and bearings are provided between the top and bottom ends of the power shaft and the inner wall of the power shaft placement cavity;

[0029] A sealing ring is provided between the power shaft and the power shaft housing cavity at the bearing position at the bottom end of the power shaft.

[0030] Furthermore, the top of the crankcase is provided with a cap located on the top of the power shaft placement cavity, the power shaft placement cavity is filled with lubricating oil, and the crankcase is provided with an oil filling port communicating with the power shaft placement cavity.

[0031] Furthermore, the inner wall of the wear-resistant bushing near the power shaft placement cavity is provided with a spiral channel for lubricating oil flow and increased lubrication, which communicates with the power shaft placement cavity.

[0032] Furthermore, an overflow channel communicating with the outside is provided in the cavity between the oil seal and the auxiliary water seal.

[0033] Furthermore, the auxiliary water seal support is provided with a first return water hole located between the main water seal and the auxiliary water seal, the high-pressure chamber shell is provided with a return water channel, and the valve cap of the one-way valve on the water inlet channel is provided with a second return water hole communicating with the water inlet hole. The first return water hole, the return water channel and the second return water hole are connected. Beneficial effects

[0034] The beneficial effects of this invention compared with the prior art are as follows: This invention has a reasonable structure and uses an eccentric shaft and bearing to control the reciprocating motion of the plunger to replace the traditional crank-connecting rod transmission mechanism, which simplifies the power transmission structure, improves the power transmission effect, improves energy utilization, reduces space occupation, and reduces the overall space occupation of the high-pressure water pump. Specifically, compared with the existing crank-connecting rod mechanism, the transmission between the power shaft and the plunger in this invention mainly reduces the connecting rod structure.

[0035] The present invention is equipped with a water-cooled chamber. The cold water enters the water inlet channel of the high-pressure chamber shell and cools the crankcase shell by passing through the water-cooled chamber which is wrapped around the crankcase shell. Specifically, it cools the lubricating oil in the power shaft housing cavity, and then cools the power shaft, plunger and mating parts, so as to avoid high temperature damage and improve the service life of the pump body.

[0036] This invention features one-way valves in both the inlet and outlet channels to ensure the direction of water flow. Specifically, the one-way valve support column is higher than the valve body, and the axial through diameter is increased. The area between adjacent support columns serves as the water outflow channel, effectively increasing the flow velocity and flow rate, preventing crossflow, and improving stability.

[0037] The crankcase of the present invention adopts a disassembled assembly structure consisting of a crankcase shell, two high-pressure chamber shells and a high-pressure water outlet shell, which facilitates disassembly and maintenance. Attached Figure Description

[0038] Figure 1 is an exploded view of the dual-cylinder high-pressure water pump of the present invention;

[0039] Figure 2 is a cross-sectional schematic diagram of the dual-cylinder high-pressure water pump of the present invention;

[0040] Figure 3 is an enlarged view of point A in Figure 2;

[0041] Figure 4 is a schematic diagram of the water cooling chamber structure of the dual-cylinder high-pressure water pump of the present invention;

[0042] Figure 5 is a three-dimensional schematic diagram of the one-way valve of the dual-cylinder high-pressure water pump of the present invention;

[0043] Figure 6 is a schematic diagram of the one-way valve cross-section of the dual-cylinder high-pressure water pump of the present invention;

[0044] Figure 7 is a schematic diagram of the spiral channel on the inner surface of the wear-resistant bushing of the double-cylinder high-pressure water pump of the present invention.

[0045] Figure 8 is a schematic diagram of the combined appearance of the dual-cylinder high-pressure water pump of the present invention;

[0046] Figure 9 is a schematic diagram of one connection method between the power shaft and the power motor of the dual-cylinder high-pressure water pump of the present invention;

[0047] Figure 10 is an enlarged view of point B in Figure 2.

[0048] As shown in the figure: 1. Power shaft; 2. Plunger; 3. Eccentric shaft; 4. Bearing; 5. Receiving groove; 6. Water inlet; 7. Water inlet channel; 8. Water outlet channel; 9. High-pressure water outlet channel; 10. High-pressure chamber; 11. Check valve; 12. Water-cooled chamber; 13. Crankcase; 14. High-pressure chamber shell; 15. High-pressure water outlet shell; 16. Power shaft placement cavity; 17. First plunger channel; 18. Second plunger channel; 19. Wear-resistant bushing; 20. Oil seal; 21. Secondary water seal bracket; 22. Main water seal; 23. Secondary water seal; 24. Sealing ring; 25. End cap; 26. Oil filler port; 27. Spiral channel; 28. Overflow channel; 29. ​​Input flange; 30. First return water hole; 31. Return water channel; 32. Second return water hole;

[0049] 701. First water inlet channel; 702. Second water inlet channel;

[0050] 801. First water outlet channel; 802. Second water outlet channel;

[0051] 1101. Valve cap; 1102. Inlet hole; 1103. Outlet hole; 1104. Valve plate; 1105. Spring; 1106. Connecting ring; 1107. Support column; 1108. Valve plate limiting ring; 1109. Spring limiting ring; 1110. Reinforcing rib;

[0052] 1201, Water storage ring tank; 1202, Water jacket. Embodiments of the present invention

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In the description of the embodiments of the present invention, if a feature is referred to as "setting", "fixing", "connecting", or "installing" on another feature, it can be set, fixed, or connected directly to the other feature, or it can be set, fixed, connected, or installed indirectly on the other feature.

[0056] In the description of the embodiments of the present invention, the term "several" means one or more, and the term "multiple" means two or more. The terms "greater than," "less than," and "exceeding" should be understood as excluding the stated number, while the terms "above," "below," and "within" should be understood as including the stated number. The terms "first" and "second" should be understood as distinguishing technical features, and not as indicating or implying relative importance, the number of indicated technical features, or the order of the indicated technical features.

[0057] The following description, with reference to the accompanying drawings, illustrates an embodiment of the present invention using a dual-cylinder high-pressure water pump as an example.

[0058] As shown in Figures 1 and 2, the dual-cylinder high-pressure water pump includes:

[0059] Crankcase;

[0060] The twin-cylinder mechanism includes a power shaft 1 installed in the crankcase for power input and rotating around its own axis, and a plunger 2 controlled by the power shaft 1 to move reciprocally in a linear motion. The top of the power shaft 1 is provided with an eccentric shaft 3, and a bearing 4 is sleeved on the eccentric shaft 3. The bottom side of the middle part of the plunger 2 is provided with a receiving groove 5. The eccentric shaft 3 and the bearing 4 on the eccentric shaft 3 are both located in the receiving groove 5. The crankcase is provided with a channel for the plunger 2 to move, and the two ends of the plunger 2 move in the channel.

[0061] The water flow channel, located on the crankcase, includes two water inlet channels 7 branching off from a water inlet 6, a high-pressure water outlet channel 9 formed by the convergence of two water outlet channels 8, and two high-pressure chambers 10. The water inlet 6 is equipped with a water inlet connector. The two high-pressure chambers 10 are located on the crankcase and are respectively located at the ends of the plunger 2. The water inlet end of each high-pressure chamber 10 is connected to one water inlet channel 7, and the water outlet end is connected to one water outlet channel 8. Each water inlet channel 7 and each water outlet channel 8 is equipped with a one-way valve 11. The one-way valve 11 on the water inlet channel 7 controls the water flow to flow only from the water inlet 6 to the high-pressure chamber 10, and the one-way valve 11 on the water outlet channel 8 controls the water flow to flow only from the high-pressure chamber 10 to the high-pressure water outlet channel 9.

[0062] The rotation of the power shaft 1 controls the reciprocating movement of the plunger 2 via the eccentric shaft 3 and the bearing 4 on the eccentric shaft 3. The end of the plunger 2 enters and exits the high-pressure chamber 10, controlling the water inlet and outlet of the high-pressure chamber 10. The end of the plunger 2 moves away from the high-pressure chamber 10, and the high-pressure chamber 10 receives water through the water inlet channel 7. The end of the plunger 2 enters the high-pressure chamber 10, and the high-pressure chamber 10 exits water through the water outlet channel 8.

[0063] As a preferred embodiment of this invention, as shown in Figures 1, 2, and 4, a water-cooled chamber 12 is provided between the water inlet 6 and the two water inlet channels 7 on the crankcase. The water-cooled chamber 12 is arranged around the power shaft 1. The water inlet 6 is located on the water-cooled chamber 12, and the two water inlet channels 7 are respectively connected to the water-cooled chamber 12. The water-cooled chamber 12, arranged around the power shaft 1, serves a cooling function.

[0064] The water-cooled chamber 12 includes a water storage ring groove 1201 located on the outer side of the bottom end of the crankcase 13 and a water jacket 1202 sleeved on the outer side of the water storage ring groove 1201. The water jacket 1202 is cylindrical and sleeved on the crankcase 13. Sealing rings 24 are provided between the water jacket 1202 and the crankcase 13, both above and below the water storage ring groove 1201.

[0065] As a preferred embodiment of this invention, as shown in Figures 1 and 2, the crankcase includes a crankcase housing 13, two high-pressure chamber housings 14, and a high-pressure water outlet housing 15. The two high-pressure chamber housings 14 are respectively connected to both sides of the crankcase housing 13, and the high-pressure water outlet housing 15 is located above the crankcase housing 13 and its two ends are respectively connected to one of the high-pressure chamber housings 14.

[0066] The crankcase 13 is provided with a power shaft placement cavity 16, and the crankcase 13 is provided with a first plunger channel 17 located on both sides of the power shaft placement cavity 16 and communicating with the power shaft placement cavity 16.

[0067] The power shaft 1 is located in the power shaft placement cavity 16. Bearings 4 are provided between the top and bottom ends of the power shaft 1 and the inner wall of the power shaft placement cavity 16. The bearings 4 can be tapered roller bearings. A sealing ring 24 is provided between the power shaft 1 and the power shaft placement cavity 16 at the position below the bearing 4 at the bottom end of the power shaft 1. The sealing ring 24 at this position can prevent lubricating oil from leaking out from this position.

[0068] The power shaft placement cavity 16 is filled with lubricating oil. External water enters the water cooling chamber 12 to cool the lubricating oil in the power shaft placement cavity 16, thereby cooling the location of the power shaft 1 and the plunger 2, and extending the service life of the pump body.

[0069] In a preferred embodiment of this invention, a high-pressure chamber 10 is provided inside the high-pressure chamber shell 15. The high-pressure chamber 10 has a first water outlet channel 801 at its water outlet end and a first water inlet channel 701 at its water inlet end. A second plunger channel 18 communicating with the high-pressure chamber 10 is provided inside the high-pressure chamber shell 15 near the crankcase shell 13.

[0070] As shown in Figure 3, the plunger 2 can move within the first plunger channel 17 and the second plunger channel 18. A wear-resistant bushing 19 is fixedly fitted onto the plunger 2 within the first plunger channel 17. An oil seal 20 is provided between the end of the wear-resistant bushing 19 away from the power shaft placement cavity 16 and the plunger 2. A secondary water seal bracket 21, a main water seal 22, and a secondary water seal 23 are fixedly fitted onto the plunger 2 within the second plunger channel 18. The main water seal 22 is located at the end of the secondary water seal bracket 21 near the high-pressure chamber 10, and the secondary water seal 23 is located at the end of the secondary water seal bracket 21 near the wear-resistant bushing 19. The oil seal 20 provides a sealing effect to prevent lubricating oil from entering, while the water seal 22 and the secondary water seal 23 provide a sealing effect to prevent water from entering.

[0071] The high-pressure water outlet shell 15 is provided with a high-pressure water outlet channel 9. The inlet end of the high-pressure water outlet channel 9 is connected to two second water outlet channels 802. The inlet of each second water outlet channel 802 is connected to the corresponding first water outlet channel 801.

[0072] The crankcase 13 is provided with a second water inlet channel 702 that communicates with the water cooling chamber 12, and the second water inlet channel 702 is connected to the first water inlet channel 701.

[0073] One-way valves 11 are installed at the inlet of the second water outlet channel 802 on the high-pressure water outlet shell 15 and at the inlet of the first water inlet channel 701 on the high-pressure chamber shell 15.

[0074] As a preferred embodiment of this invention, as shown in Figures 5 and 6, the one-way valve 11 includes a valve cap 1101 and a valve body. The valve cap 1101 is connected to the water inlet end of the valve body. The valve cap 1101 forms a water inlet hole 1102 through the axis. The valve body has a water outlet hole 1103 on its side wall. The valve body has a valve plate 1104 and a spring 1105 inside.

[0075] The valve housing includes a mating ring 1106, and the valve cap 1101 is connected to the mating ring 1106. A plurality of support posts 1107 are evenly distributed on the side of the mating ring 1106 away from the valve cap 1101. A valve plate limiting ring 1108 and a spring limiting ring 1109 are provided on the inner side of each of the support posts 1107 and are connected to the support posts 1107. The outer diameter of the spring limiting ring 1109 is smaller than the outer diameter of the valve plate limiting ring 1108. The valve plate limiting ring 1108 is located on the spring limiting ring. Between the positioning ring 1109 and the mating ring 1106, the valve plate 1104 is located between the valve plate limiting ring 1108 and the valve cap 1101, the spring 1105 is located between the spring limiting ring 1109 and the valve plate 1104, one end of the spring 1105 abuts against the valve plate 1104, and the other end abuts against the spring limiting ring 1109, and a reinforcing rib 1110 is provided between the end of the support column 1107 away from the mating ring 1106 and the spring limiting ring 1109;

[0076] The water outlet 1103 is located between the valve plate limiting ring 1108 and the docking ring 1106. The valve plate 1104 moves between the valve plate limiting ring 1108 and the valve cap 1101 to control the opening and closing of the water outlet 1103.

[0077] The valve cap 1101 is detachably connected to the mating ring 1106, for example, the valve cap 1101 and the mating ring 1106 are detachably connected by threads.

[0078] Existing check valves are installed in water pipes. To facilitate water discharge, a discharge clearance channel is often set on the inner wall of the water pipe and around the check valve. The water discharge line of the existing check valve impacts the clearance channel and then rushes forward along the water pipe wall. This not only causes poor water discharge but also creates swirling flow and pulsation, affecting the water flow rate and velocity.

[0079] The one-way valve 11 of the present invention uses the space between the support columns 1107 on both sides of the water outlet 1103 as the main flow channel, which makes the water flow smoother and helps to increase the water flow rate and velocity.

[0080] In a preferred embodiment, the top of the crankcase 13 is provided with a cap 25 located on the top of the power shaft housing 16. The cap 25 is threaded to the top of the crankcase 13. After the cap 25 is removed, it is convenient to maintain the inside of the crankcase 13. The power shaft housing 16 is filled with lubricating oil. The crankcase 13 is provided with a filler port 26 communicating with the power shaft housing 16 to facilitate the addition of lubricating oil. When in use, the filler port 26 can be fitted with a filler cap as needed. The filler port 26 can also be used as an oil drain port to drain lubricating oil. The number and position of the filler ports 26 are set according to actual needs.

[0081] As a preferred embodiment of this invention, as shown in Figure 7, the inner wall of the wear-resistant bushing 19 near the power shaft placement cavity 16 is provided with a spiral channel 27 that communicates with the power shaft placement cavity 16. The lubricating oil in the power shaft placement cavity 16 can enter the spiral channel 27. The design of the spiral channel 27 increases the contact surface between the plunger 2 located inside the wear-resistant bushing 19 and the lubricating oil, thereby improving the lubrication effect.

[0082] In a preferred embodiment of this invention, an overflow channel 28 communicating with the outside is provided in the cavity between the oil seal 20 and the secondary water seal 23.

[0083] As shown in Figures 1 and 3, an overflow channel 28 is provided. The overflow channel 28 is provided on the high-pressure chamber shell 15. The overflow channel 28 is connected to the cavity between the oil seal 20 and the auxiliary water seal 23. For example, holes are provided on the wear-resistant bushing 19 or the auxiliary water seal bracket 21 to connect the overflow channel 28 with the cavity between the oil seal 20 and the auxiliary water seal 23.

[0084] When the plunger 2 moves back and forth, internal pressure is generated in the cavity between the oil seal 20 and the secondary water seal 23. The overflow channel 28 is used to relieve pressure and overflow.

[0085] In a preferred embodiment, the bottom end of the crankcase 13 is provided with an input flange 29 for a motor that provides power, which facilitates the installation of the power motor.

[0086] As a preferred embodiment of this invention, as shown in Figure 9, a keyway hole can be provided at the center of the end of the power shaft 1 away from the eccentric shaft 3. A key is provided on the output shaft of the power motor with reducer, which can cooperate with the keyway hole in the power shaft 1 to realize the transmission connection between the output shaft of the power motor and the power shaft 1. The keyway hole also serves to reduce the weight of the power shaft 1. The transmission connection between the power shaft 1 and the power motor includes, but is not limited to, the aforementioned connection methods.

[0087] As a preferred embodiment of this invention, as shown in Figure 10, a first return water hole 30 is provided on the secondary water seal bracket 21 between the main water seal 22 and the secondary water seal 23. A return water channel 31 is provided on the high-pressure chamber shell 14. A second return water hole 32 communicating with the inlet hole 1102 is provided on the valve cap 1101 of the one-way valve 11 on the inlet channel 7. The first return water hole 30, the return water channel 31, and the second return water hole 32 are connected. On the secondary water seal bracket 21, between the main water seal 22 and the secondary water seal 23... To maintain lubrication between the main water seal lip, the secondary water seal lip and the plunger 2, and to reduce clamping force, water will accumulate between the main water seal 22 and the secondary water seal 23. As the number of radial movements of the plunger 2 between the main water seal and the secondary water seal increases, more and more water accumulates between the main water seal and the secondary water seal, which will generate pressure. Therefore, a return water path consisting of the first return water hole 30, the return water channel 31 and the second return water hole 32 is set up so that the water that is constantly increasing between the main water seal and the secondary water seal flows back to the inlet hole of the one-way valve on the inlet channel.

[0088] In practical use, a pressure regulating valve can be installed at the outlet end of the high-pressure water outlet channel 9 and then connected to an external water outlet pipe. The setting of the pressure regulating valve is shown in Figure 8. A water inlet connector is set at the water inlet 6 and connected to an external water supply pipe. A power motor with a reducer is installed on the input flange 29, and its output shaft is connected to the power shaft 1. Water is supplied by the external water supply pipe. When the power motor is started, the power shaft 1 rotates, and the eccentric shaft 3 and its bearing 4 drive the plunger 2 to reciprocate. The two ends of the plunger 2 continuously form water intake and drainage phenomena in the corresponding high-pressure chamber 10. Due to the reciprocating motion of the plunger 2, a continuous high-pressure water outlet is formed in the high-pressure water outlet channel 9. In addition, when water is supplied by the external water supply pipe into the water-cooling chamber, the lubricating oil in the power shaft placement cavity 16 can be cooled by heat exchange, thereby cooling the power shaft 1, the plunger 2 and its mating parts, avoiding the problem of high temperature burning the pump body and extending the service life.

[0089] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A dual-cylinder high-pressure water pump, characterized in that, include: Crankcase; A twin-cylinder mechanism, installed in a crankcase, includes a power shaft for power input that rotates around its own axis and a plunger that reciprocates linearly controlled by the power shaft. An eccentric shaft is provided at the top of the power shaft, and a bearing is sleeved on the eccentric shaft. A receiving groove is provided on the bottom side of the middle part of the plunger. The eccentric shaft and the bearing on the eccentric shaft are both located in the receiving groove. The crankcase is provided with a channel for the movement and directional holding of the plunger, and the two ends of the plunger can move within the channel. The water flow channel, located on the crankcase, includes two water inlet channels branching from a single inlet, a single high-pressure outlet channel formed by the convergence of the two outlet channels, and two high-pressure chambers. The two high-pressure chambers are located on the crankcase and at the two ends of the plunger, respectively. Each high-pressure chamber has an inlet channel connected to its inlet end and an outlet channel connected to its outlet end. Each inlet channel and each outlet channel is equipped with a one-way valve. The one-way valve on the inlet channel controls the water flow to flow only from the inlet to the high-pressure chamber, and the one-way valve on the outlet channel controls the water flow to flow only from the high-pressure chamber to the high-pressure outlet channel. The rotation of the power shaft controls the reciprocating movement of the plunger via the eccentric shaft and the bearings on the eccentric shaft. The plunger end enters and exits the high-pressure chamber, controlling the water inlet and outlet of the high-pressure chamber. When the plunger end moves away from the high-pressure chamber, water enters the high-pressure chamber through the water inlet channel, and water exits the high-pressure chamber through the water outlet channel.

2. The dual-cylinder high-pressure water pump according to claim 1, characterized in that: A water-cooled chamber is provided between the water inlet and the two water inlet channels. The water-cooled chamber is arranged around the power shaft. The water inlet is located on the water-cooled chamber. The two water inlet channels are respectively connected to the water-cooled chamber. The water-cooled chamber is arranged around the power shaft to provide a cooling function.

3. The dual-cylinder high-pressure water pump according to claim 2, characterized in that: The crankcase includes a crankcase housing, two high-pressure chamber housings and a high-pressure water outlet housing. The two high-pressure chamber housings are respectively connected to the two sides of the crankcase housing, and the high-pressure water outlet housing is located above the crankcase housing and its two ends are respectively connected to one of the high-pressure chamber housings. The crankcase is provided with a power shaft placement cavity, and the crankcase is provided with a first plunger channel located on both sides of the power shaft placement cavity and communicating with the power shaft placement cavity. The high-pressure chamber is provided inside the high-pressure chamber shell. The high-pressure chamber has a first water outlet channel at the water outlet end and a first water inlet channel at the water inlet end. The high-pressure chamber shell has a second plunger channel for connecting the first plunger channel and the high-pressure chamber on the side near the crankcase shell. The plunger is movable within the first plunger channel and the second plunger channel. A wear-resistant bushing is fixedly fitted onto the plunger within the first plunger channel. An oil seal is provided between the end of the wear-resistant bushing away from the power shaft placement cavity and the plunger. A secondary water seal bracket, a main water seal, and a secondary water seal are fixedly fitted onto the plunger within the second plunger channel. The main water seal is located at the end of the secondary water seal bracket near the high-pressure chamber, and the secondary water seal is located at the end of the secondary water seal bracket near the wear-resistant bushing. The high-pressure water outlet shell is provided with a high-pressure water outlet channel. The inlet end of the high-pressure water outlet channel is connected to two second water outlet channels. The inlet of each second water outlet channel is connected to the corresponding first water outlet channel. The crankcase is provided with a second water inlet channel that communicates with the water cooling chamber, and the second water inlet channel is connected to the first water inlet channel. One-way valves are installed at the inlet of the second water outlet channel on the high-pressure outlet shell and at the inlet of the first water inlet channel on the high-pressure chamber shell.

4. The dual-cylinder high-pressure water pump according to claim 1, 2 or 3, characterized in that: The one-way valve includes a valve cap and a valve body. The valve cap is connected to the water inlet end of the valve body. The valve cap has a through-hole forming a water inlet. The valve body has a water outlet on its side wall. The valve body contains a valve plate and a spring. The valve body includes a mating ring, and the valve cap is connected to the mating ring. A plurality of support columns are evenly distributed on the side of the mating ring away from the valve cap. A valve plate limiting ring and a spring limiting ring are provided on the inner side of the plurality of support columns and connected to the support columns. The diameter of the spring limiting ring is smaller than the diameter of the valve plate limiting ring. The valve plate limiting ring is located between the spring limiting ring and the mating ring. The valve plate is located between the valve plate limiting ring and the valve cap. The spring is located between the spring limiting ring and the valve plate. One end of the spring abuts against the valve plate, and the other end abuts against the spring limiting ring. The water outlet is located between the valve plate limiting ring and the docking ring. The valve plate moves between the valve plate limiting ring and the valve cap to control the opening and closing of the water outlet. The space between two adjacent support columns is connected to the water outlet to form a main flow channel.

5. The dual-cylinder high-pressure water pump according to claim 3, characterized in that: The water-cooled chamber includes a water storage ring groove located on the outer side of the bottom end of the crankcase and a water jacket sleeved on the outer side of the water storage ring groove. Sealing rings are provided between the top and bottom ends of the inner wall of the water jacket and the crankcase.

6. The dual-cylinder high-pressure water pump according to claim 3, characterized in that: The power shaft is located inside the power shaft placement cavity, and bearings are provided between the top and bottom ends of the power shaft and the inner wall of the power shaft placement cavity. A sealing ring is provided between the power shaft and the power shaft housing cavity at the bearing position at the bottom end of the power shaft.

7. The dual-cylinder high-pressure water pump according to claim 6, characterized in that: The top of the crankcase is provided with a cap located on the top of the power shaft placement cavity. The power shaft placement cavity is filled with lubricating oil, and the crankcase is provided with an oil filling port that communicates with the power shaft placement cavity.

8. The dual-cylinder high-pressure water pump according to claim 3, characterized in that: The inner wall of the wear-resistant bushing near the power shaft placement cavity is provided with a spiral channel for lubricating oil flow and increased lubrication, which communicates with the power shaft placement cavity.

9. The dual-cylinder high-pressure water pump according to claim 3, characterized in that: An overflow channel connecting to the outside is provided in the cavity between the oil seal and the secondary water seal.

10. The dual-cylinder high-pressure water pump according to claim 4, characterized in that: The auxiliary water seal support is provided with a first return water hole located between the main water seal and the auxiliary water seal. The high-pressure chamber shell is provided with a return water channel. The valve cap of the one-way valve on the water inlet channel is provided with a second return water hole that communicates with the water inlet hole. The first return water hole, the return water channel and the second return water hole are connected.

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