A high-pressure, high-flow, corrosion-resistant power drive module

Abstract

This invention relates to the field of fluid power machinery technology and discloses a high-pressure, high-flow, corrosion-resistant power drive module, including a crankcase, a one-way pump and a hydraulic power unit fixedly installed outside the crankcase. Multiple plunger brackets are slidably connected to the inner wall of the crankcase, and multiple plunger cylinders are also fixedly installed inside the crankcase. An adaptive deformation mechanism is provided inside each plunger cylinder, including a telescopic plunger fixedly connected to a corresponding plunger bracket. By setting up the adaptive deformation mechanism, the module utilizes the medium pressure for self-adjustment, directly converting the fluid pressure into sealing specific pressure. This achieves a dynamic balance where higher pressure results in a tighter seal, significantly improving the module's volumetric efficiency under different operating conditions, reducing ineffective friction loss and temperature rise, and enhancing overall energy efficiency and operational stability.

Description

Technical Field

[0001] This invention relates to the field of fluid power machinery technology, and in particular to a high-pressure, high-flow, corrosion-resistant power drive module. Background Technology

[0002] In fields such as chemical engineering, metallurgy, and environmental protection, drive modules for conveying highly corrosive media (such as acids, alkalis, and high-concentration salt solutions) face severe challenges. While traditional plunger pumps can achieve high pressure and high flow rates, the dynamic sealing pair between the plunger and cylinder is constantly exposed to corrosive media, making them prone to corrosion, wear, and leakage, resulting in short lifespans and high maintenance costs. Existing technologies often employ expensive corrosion-resistant alloys or complex external isolation systems, which suffer from high costs, low efficiency, and system complexity. Therefore, there is an urgent need for a drive module that can provide long-term, reliable corrosion protection for core moving components under high pressure and high flow conditions, and possesses adaptive sealing capabilities.

[0003] The existing technology has the following drawbacks: Insufficient sealing reliability under high-pressure conditions: Traditional fixed seals (such as packing seals and standard rubber rings) have a constant preload. During the low-pressure suction stage, excessive preload leads to high frictional resistance, high energy consumption, and rapid heat and wear. During the high-pressure discharge stage, the fixed preload may be insufficient to cope with the surge in medium pressure, resulting in poor sealing, increased internal leakage, and decreased volumetric efficiency. This limits the pump's efficient and stable operation under varying pressure conditions, making it difficult to simultaneously meet the requirements of high volumetric efficiency and low frictional loss.

[0004] Dynamic sealing components are prone to corrosion and leakage: In traditional high-pressure pumps, the plunger / piston and cylinder sealing surfaces are in direct contact with corrosive media for extended periods. Although corrosion-resistant alloy materials can be used, tiny gaps and frictional wear during high-pressure reciprocating motion can still damage the passivation layer or coating, exposing the substrate. Simultaneously, corrosion products exacerbate seal wear, creating a vicious cycle of corrosion-wear synergistic damage, leading to seal failure and media leakage. This not only pollutes the environment and poses safety hazards but also forces frequent equipment shutdowns for seal replacement, severely impacting production continuity and stability, and significantly increasing maintenance costs and downtime losses. Summary of the Invention

[0005] In view of the problems of insufficient sealing reliability under high pressure conditions and easy corrosion and leakage of dynamic sealing components in the existing technology, a high-pressure, high-flow corrosion-resistant power drive module is proposed.

[0006] This application provides a high-pressure, high-flow, corrosion-resistant power drive module. Its purpose is to achieve the following by designing an isolation mechanism that integrates a buffer tank and an adaptive seal: automatically enhancing the sealing force during the high-pressure stage to ensure reliable sealing, and simultaneously using the buffer to form an isolation membrane during the low-pressure stage to physically isolate the core moving parts from the corrosive medium, thereby achieving a comprehensive effect of long-term corrosion protection, reduced friction and wear, improved volumetric efficiency, and operational stability.

[0007] The technical solution of the present invention is as follows: a high-pressure, high-flow, corrosion-resistant power drive module, including a crankcase, and a one-way pump and a hydraulic power unit fixedly installed outside the crankcase. The inner wall of the crankcase is slidably connected with multiple plunger brackets, and the module also includes multiple plunger cylinders fixedly installed inside the crankcase. The plunger cylinders are provided with an adaptive deformation mechanism inside. The adaptive deformation mechanism includes a telescopic plunger, which is fixedly connected to a corresponding plunger frame. A sliding column is slidably connected to the inner wall of the telescopic plunger, and an expansion friction assembly is provided on the inner wall of the telescopic plunger. During the liquid discharge stage, the telescopic plunger moves towards the direction of the one-way pump, causing the sliding column to slide into the telescopic plunger under the influence of high pressure, triggering the expansion friction assembly to unfold and tightly fit against the inner wall of the plunger cylinder, forming a high-pressure adaptive seal.

[0008] By adopting the above scheme and through the set adaptive deformation mechanism, dynamic sealing with pressure adaptation can be achieved. This mechanism can automatically trigger or release the auxiliary seal according to the internal pressure of the system, achieving the intelligent effect of tighter sealing as the pressure increases. This effectively solves the contradiction that traditional fixed seals are prone to leakage under high pressure and have high frictional resistance under low pressure. This ensures that the module can maintain extremely high sealing reliability when outputting high-pressure, high-flow corrosive media, while reducing low-pressure operating resistance and improving overall energy efficiency and service life.

[0009] Furthermore, the inner wall of the plunger cylinder is provided with a buffer solution tank, and two low-friction rubber rings are fixedly connected to the inner wall of the buffer solution tank. The outer wall of the telescopic plunger is provided with a slope, so that it forms two sections with different diameters. The section near the plunger frame slides and seals with the low-friction rubber ring, and the section near the one-way pump forms an annular liquid outlet with the low-friction rubber ring.

[0010] Furthermore, during the liquid inlet phase, the telescopic plunger moves toward the plunger holder, and the buffer solution in the buffer tank flows out from the outlet, forming a liquid phase isolation barrier between the telescopic plunger and the plunger cylinder.

[0011] Using the above scheme, through the buffer tank, during the liquid inlet phase, the telescopic plunger moves towards the plunger holder. When its smaller diameter section slides into the rubber ring near the one-way pump, a ring-shaped outlet is dynamically formed between them due to the diameter difference. At the same time, the hydraulic power unit continuously supplies pressurized buffer to the buffer tank. Driven by pressure, the buffer flows out of the buffer tank and enters the gap between the plunger and the cylinder through this open outlet, forming a liquid phase isolation film. This film physically separates the corrosive working medium from the inner wall of the cylinder and the surface of the sealing ring, achieving dynamic corrosion protection.

[0012] Furthermore, the inner wall of the telescopic plunger is provided with a through hole and a telescopic cavity, the telescopic cavity is connected to the buffer tank through the through hole, and a telescopic spring is connected between the end of the slide near the plunger frame and the telescopic cavity.

[0013] By employing the above scheme, a pressure-sensing mechanism composed of a telescopic plunger, a sliding column, and a telescopic spring, and a force-conversion mechanism composed of an expansion diaphragm and ball bearings, the dual effects of low-pressure liquid inlet corrosion prevention and high-pressure adaptive sealing are achieved. During liquid inlet, a protective liquid film is formed to isolate corrosive media; during high-pressure discharge, an expansion seal is automatically triggered, achieving zero leakage through pressure adaptation, thereby ensuring the equipment's corrosion resistance and sealing reliability under high-pressure, high-flow conditions.

[0014] Furthermore, the expansion friction assembly includes an expansion membrane fixedly installed on the outer wall of the telescopic plunger, and the inner wall of the telescopic plunger is provided with multiple limiting grooves and multiple extrusion grooves, the limiting grooves being connected to the corresponding extrusion grooves.

[0015] Furthermore, the limiting groove is provided with ball bearings, the inner wall of the extrusion groove is slidably connected with an extrusion rod, and an extrusion spring is connected between the extrusion rod and the extrusion groove.

[0016] Furthermore, the outer wall of the ball abuts against the expansion film and the corresponding extrusion rod respectively, and the end of the extrusion rod away from the ball abuts against the outer wall of the slide column.

[0017] Using the above scheme, when the sliding column is pushed backward by the expansion friction component, it drives the extrusion rod to push the ball axially. The ball moves radially outward along the limiting groove, efficiently converting the axial force into a radial force, thereby lifting the expansion film and pressing it against the cylinder wall to form a pressure-adaptive auxiliary seal; the higher the pressure, the tighter the seal.

[0018] Furthermore, the outer wall of the hydraulic power unit is connected to a buffer solution connecting pipe, and the hydraulic power unit is connected to multiple buffer solution tanks through the buffer solution connecting pipe, and the pressure of the buffer solution tanks can be adjusted in real time by the hydraulic power unit.

[0019] By adopting the above scheme, a stable and controllable pressure is provided to the buffer tank of the cylinder through the set hydraulic power device and the buffer connection pipe. When the plunger moves backward after entering the liquid, the pressure is used to squeeze the buffer through the outlet, forming a continuous liquid isolation film between the plunger and the cylinder wall. This physically separates the corrosive working medium from the inner wall of the cylinder, the low friction sealing ring and other key components, thus achieving long-term active anti-corrosion protection for the core moving parts.

[0020] Furthermore, the unidirectional pump is internally equipped with an inlet pipe, an outlet pipe, and a pressurizing chamber. An inlet valve is installed between the inlet pipe and the pressurizing chamber, and an outlet valve is installed between the outlet pipe and the pressurizing chamber. The pressurizing chamber is connected to the interior of the plunger cylinder.

[0021] Using the above scheme, a unidirectional pump is installed. When the plunger is sucked in, a negative pressure is formed to open the inlet valve, allowing the medium to enter. When the plunger is pressurized and discharged, the pressure automatically closes the inlet valve and opens the outlet valve, ensuring that the medium can only flow in unidirectionally from the inlet pipe and be discharged unidirectionally under high pressure from the outlet pipe through the pressurization chamber, preventing backflow and realizing high-pressure directional delivery.

[0022] Furthermore, a drive motor is provided on the outside of the crankcase, a rotating crankshaft is rotatably connected to the inner wall of the crankcase, the output shaft of the drive motor is fixedly connected to the rotating crankshaft, and multiple swing connecting rods are fixedly connected to the outer wall of the rotating crankshaft, the swing connecting rods being drivenly connected to the corresponding plunger frame.

[0023] The above scheme uses a drive motor to rotate the crankshaft. The eccentric motion of the crankshaft is converted into linear reciprocating motion through multiple swing linkages fixed on its outer wall, which drives the corresponding plunger frames to move synchronously. This achieves regular and highly synchronous reciprocating drive of multiple plunger frames and telescopic plungers, which is the core power source and mechanical foundation for the entire pump to achieve continuous, stable, high-pressure, and high-flow output.

[0024] The beneficial effects of this invention are: 1. By setting an adaptive deformation mechanism, the system utilizes the medium pressure for self-adjustment. During the low-pressure intake stage, the mechanism maintains its initial state, with only a low-friction rubber ring providing basic sealing, resulting in low frictional resistance. When entering the high-pressure discharge stage, the working medium pressure in the plunger cavity acts on the sliding column, overcoming the elasticity of the telescopic spring and pushing the sliding column to move axially. The sliding column drives the balls to move radially outward through the extrusion rod, efficiently converting the axial force into a radial force, thereby lifting the expansion film and generating an additional clamping force against the inner wall of the plunger cylinder that is positively correlated with the medium pressure. This effectively converts the fluid pressure directly into the sealing specific pressure, achieving a dynamic balance where the higher the pressure, the tighter the seal. This significantly improves the volumetric efficiency of the module under different operating conditions, reduces ineffective frictional losses and temperature rise, and enhances overall energy efficiency and operational stability.

[0025] 2. Through the set buffer system, an automatic protection mechanism is formed during the liquid inlet phase of the plunger. When the telescopic plunger moves towards the plunger holder, its small diameter section slides into the rubber ring near the one-way pump, dynamically forming an annular outlet. At this time, the hydraulic power unit continuously supplies clean buffer solution slightly higher than the suction pressure to the buffer tank through the buffer solution connection pipe. The buffer solution flows out from the outlet under the pressure difference drive, forming a continuous liquid phase isolation film between the outer wall of the telescopic plunger and the inner wall of the cylinder. This plays the role of establishing a physical isolation layer between the corrosive working medium and the cylinder and sealing ring surfaces, greatly extending the service life of key moving parts and seals, reducing the maintenance frequency and cost caused by corrosion leakage, and ensuring the long-term operational reliability of the equipment under strong corrosive conditions.

[0026] 3. Through the crank-connecting rod mechanism, which consists of a drive motor, a rotating crankshaft, multiple swing connecting rods, and a plunger structure, the rotational motion of the motor is synchronously and smoothly converted into the linear reciprocating motion of multiple plungers. This achieves the high synchronization and regularity of the multi-plunger drive, providing the most basic, continuous, and balanced hydraulic power source for the stable performance of subsequent adaptive sealing and corrosion protection functions. It is the core mechanical guarantee for the entire module to achieve high pressure, high flow, and continuous and stable output, avoiding the impact on the seal and system pipeline caused by excessive flow and pressure pulsation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the crankcase structure of the present invention; Figure 3 This is a schematic diagram of the unidirectional pump structure of the present invention; Figure 4 This is a schematic diagram of the piston cylinder structure of the present invention; Figure 5 This is a schematic diagram of the telescopic plunger structure of the present invention; Figure 6 This is a schematic diagram of the sliding column structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of point A in the middle; Figure 8 This is a schematic diagram of the alternating opening state of the inlet valve and outlet valve of the present invention; Figure 9 This is a schematic diagram of the hydraulic power unit of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of point B in the middle section; Figure 11 This is a schematic diagram of the structure of the buffer solution connection tube of the present invention.

[0028] In the picture: 1. Crankcase; 11. Rotating crankshaft; 12. Oscillating connecting rod; 13. Plunger bracket; 2. One-way pump; 21. Inlet pipe; 22. Outlet pipe; 23. Inlet valve; 24. Outlet valve; 25. Pressurization chamber; 3. Hydraulic power unit; 31. Buffer connection pipe; 4. Drive motor; 5. Plunger cylinder; 51. Buffer tank; 52. Low-friction rubber ring; 6. Adaptive deformation mechanism; 61. Telescopic plunger; 611. Through hole; 612. Telescopic chamber; 613. Ramp; 614. Outlet; 62. Expansion friction assembly; 621. Expansion membrane; 622. Limiting groove; 623. Ball bearing; 624. Extrusion groove; 625. Extrusion spring; 626. Extrusion rod; 63. Telescopic spring; 64. Sliding column. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Reference Figure 1 - Figure 11 A high-pressure, high-flow, corrosion-resistant power drive module is provided, including a crankcase 1, a one-way pump 2 and a hydraulic power unit 3 fixedly installed outside the crankcase 1, a plurality of plunger brackets 13 are slidably connected to the inner wall of the crankcase 1, and a plurality of plunger cylinders 5 are fixedly installed inside the crankcase 1, with an adaptive deformation mechanism 6 provided inside the plunger cylinders 5.

[0031] Reference Figure 3 - Figure 6 The adaptive deformation mechanism 6 includes a telescopic plunger 61, which is fixedly connected to the corresponding plunger frame 13. A sliding column 64 is slidably connected to the inner wall of the telescopic plunger 61. An expansion friction assembly 62 is provided on the inner wall of the telescopic plunger 61. During the liquid discharge stage, the telescopic plunger 61 moves towards the one-way pump 2, causing the sliding column 64 to slide into the telescopic plunger 61 under the influence of high pressure, triggering the expansion friction assembly 62 to unfold, so that it fits tightly against the inner wall of the plunger cylinder 5, forming a high-pressure adaptive seal.

[0032] Specifically, the slide 64 is the pressure sensor of the entire adaptive sealing mechanism. During the low-pressure intake phase, it is pushed outward by the pre-tightened telescopic spring 63 to keep the mechanism in a non-triggered state. During the high-pressure discharge phase, the medium pressure overcomes the spring force and pushes the slide 64 to slide towards the plunger holder 13. Its movement is both the transmission of pressure signals and the direct power source for driving the subsequent expansion friction assembly 62. As the execution terminal for sealing enhancement, the expansion friction assembly 62 can dynamically change its radial dimension according to the system pressure to provide a matching sealing force.

[0033] The adaptive deformation mechanism 6 enables dynamic sealing that adapts to pressure. This mechanism can automatically trigger or release the auxiliary seal based on the internal pressure of the system, achieving an intelligent effect where the higher the pressure, the tighter the seal. This effectively solves the contradiction that traditional fixed seals are prone to leakage under high pressure and have high frictional resistance under low pressure. As a result, the module can maintain extremely high sealing reliability when outputting high-pressure, high-flow-rate corrosive media, while also reducing low-pressure operating resistance and improving overall energy efficiency and service life.

[0034] Reference Figure 3 - Figure 7 The inner wall of the plunger cylinder 5 is provided with a buffer solution tank 51. Two low-friction rubber rings 52 are fixedly connected to the inner wall of the buffer solution tank 51. The outer wall of the telescopic plunger 61 is provided with a ramp 613, which forms two sections with different diameters. The section near the plunger frame 13 is in sliding seal with the low-friction rubber ring 52, and the section near the one-way pump 2 forms an annular outlet 614 between the low-friction rubber ring 52 and the section near the one-way pump 2. During the liquid inlet stage, the telescopic plunger 61 moves towards the plunger frame 13, and the buffer solution in the buffer solution tank 51 flows out from the outlet 614, forming a liquid phase isolation barrier between the telescopic plunger 61 and the plunger cylinder 5.

[0035] Specifically, the buffer tank 51 serves as a storage and distribution channel for protective fluid, receiving buffer solution with stable pressure provided by the hydraulic power unit 3 and guiding the buffer solution to the designed outflow path; the ramp 613 on the telescopic plunger 61 divides it into two sections with different diameters, dynamically controlling the opening and closing of the outlet 614. The larger diameter section is responsible for maintaining a sliding seal with the low-friction rubber ring 52, while the smaller diameter section is responsible for creating a gap within a specific stroke to form the outlet 614.

[0036] During the liquid inlet phase, the telescopic plunger 61 moves towards the plunger holder 13 via the buffer tank 51. When its smaller diameter section slides into the rubber ring near the one-way pump 2, a ring-shaped outlet 614 is dynamically formed between them due to the diameter difference. At the same time, the hydraulic power unit 3 continuously supplies pressurized buffer solution to the buffer tank 51. Under pressure, the buffer solution flows out of the buffer tank 51 and enters the gap between the plunger and the cylinder through the opened outlet 614, forming a liquid phase isolation film. This film physically separates the corrosive working medium from the inner wall of the cylinder and the surface of the sealing ring, achieving dynamic corrosion protection.

[0037] Reference Figure 6 - Figure 10 The inner wall of the telescopic plunger 61 is provided with a through hole 611 and a telescopic cavity 612. The telescopic cavity 612 is connected to the buffer tank 51 through the through hole 611. A telescopic spring 63 is connected between the end of the slide column 64 near the plunger frame 13 and the telescopic cavity 612.

[0038] The pressure sensing mechanism, composed of a telescopic plunger 61, a sliding rod 64, and a telescopic spring 63, and the force conversion mechanism, composed of an expansion diaphragm 621 and a ball bearing 623, achieves the dual effects of low-pressure liquid inlet corrosion prevention and high-pressure adaptive sealing. During liquid inlet, a protective liquid film is formed to isolate corrosive media; during high-pressure discharge, the expansion seal is automatically triggered, achieving zero leakage through pressure adaptation, thus ensuring the equipment's corrosion resistance and sealing reliability under high-pressure, high-flow conditions.

[0039] Reference Figure 5 - Figure 10 The expansion friction assembly 62 includes an expansion membrane 621 fixedly installed on the outer wall of the telescopic plunger 61. The inner wall of the telescopic plunger 61 is provided with a plurality of limiting grooves 622 and a plurality of extrusion grooves 624. The limiting grooves 622 communicate with the corresponding extrusion grooves 624. A ball bearing 623 is provided inside the limiting groove 622. An extrusion rod 626 is slidably connected to the inner wall of the extrusion groove 624. A compression spring 625 is connected between the extrusion rod 626 and the extrusion groove 624. The outer wall of the ball bearing 623 abuts against the expansion membrane 621 and the corresponding extrusion rod 626 respectively. The end of the extrusion rod 626 away from the ball bearing 623 abuts against the outer wall of the sliding column 64.

[0040] Specifically, the expansion membrane 621 is the final sealing element. After expansion, it fits tightly against the inner wall of the cylinder to form a high-pressure auxiliary seal. The ball 623 efficiently converts the axial thrust of the extrusion rod 626 into a radial thrust on the expansion membrane 621, and it can rotate freely in the limiting groove 622. The extrusion rod 626 is axially pushed by the slide rod 64, which directly transmits the force to the ball 623.

[0041] When the sliding column 64 is pushed backward by the expansion friction component 62, it drives the extrusion rod 626 to axially push the ball 623. The ball 623 moves radially outward along the limiting groove 622, efficiently converting the axial force into a radial force, thereby lifting the expansion film 621 and pressing it against the cylinder wall to form a pressure-adaptive auxiliary seal; the higher the pressure, the tighter the seal.

[0042] Reference Figure 11 The outer wall of the hydraulic power unit 3 is connected to a buffer connection pipe 31. The hydraulic power unit 3 is connected to multiple buffer tanks 51 through the buffer connection pipe 31, and the pressure of the buffer tanks 51 can be adjusted in real time by the hydraulic power unit 3.

[0043] The hydraulic power unit 3 provides stable and controllable pressure to the buffer tank 51 of the plunger cylinder 5 via the buffer connection pipe 31. When the plunger moves backward after liquid inlet, the pressure is used to squeeze the buffer through the outlet 614, forming a continuous liquid isolation film between the plunger and the cylinder wall. This physically separates the corrosive working medium from the inner wall of the cylinder, the low-friction rubber ring 52, and other key components, thus achieving long-term active corrosion protection for the core moving parts.

[0044] Reference Figure 3 - Figure 8 The one-way pump 2 is internally equipped with an inlet pipe 21, an outlet pipe 22 and a pressurizing chamber 25. An inlet valve 23 is installed between the inlet pipe 21 and the pressurizing chamber 25, and an outlet valve 24 is installed between the outlet pipe 22 and the pressurizing chamber 25. The pressurizing chamber 25 is connected to the interior of the plunger cylinder 5.

[0045] When the telescopic plunger 61 draws in the medium via the unidirectional pump 2, a negative pressure is created to open the inlet valve 23, allowing the medium to enter. When the plunger is pressurized and discharged, the pressure automatically closes the inlet valve 23 and opens the outlet valve 24, ensuring that the medium can only flow in unidirectionally from the inlet pipe 21 and is discharged unidirectionally under high pressure from the outlet pipe 22 via the pressurization chamber 25, preventing backflow and achieving high-pressure directional delivery.

[0046] Reference Figure 2 A drive motor 4 is installed on the outside of the crankcase 1. A rotating crankshaft 11 is rotatably connected to the inner wall of the crankcase 1. The output shaft of the drive motor 4 is fixedly connected to the rotating crankshaft 11. Multiple swing connecting rods 12 are fixedly connected to the outer wall of the rotating crankshaft 11. The swing connecting rods 12 are connected to the corresponding plunger frame 13 for transmission.

[0047] The crankshaft 11 is rotated by the drive motor 4. The eccentric motion of the crankshaft is converted into linear reciprocating motion by multiple swing connecting rods 12 fixed on its outer wall. This drives the corresponding plunger frame 13 to move synchronously, thereby realizing the regular and highly synchronous reciprocating drive of multiple plunger frames 13 and telescopic plunger 61. This is the core power source and mechanical foundation for the entire pump to achieve continuous, stable, high-pressure and high-flow output.

[0048] Working principle of the invention: During operation, the drive motor 4 starts, and its output shaft drives the rotating crankshaft 11 to rotate. The rotating crankshaft 11 drives multiple swing connecting rods 12 on its outer wall to swing regularly, thereby driving the plunger frame 13 to slide back and forth in the crankcase 1.

[0049] When the telescopic plunger 61 moves away from the one-way pump 2 toward the plunger frame 13, the working chamber volume inside the plunger cylinder 5 increases, creating a negative pressure. The inlet valve 23 of the one-way pump 2 opens under the action of the pressure difference, and the corrosive working medium is drawn into the pressurized chamber 25 through the inlet pipe 21, and then enters the working chamber of the plunger cylinder 5, completing the medium intake.

[0050] During the liquid inlet phase, the telescopic plunger 61 continues to move toward the plunger holder 13, causing the position of the ramp 613 on the outer wall of the telescopic plunger 61 to change. The smaller diameter section gradually enters and slides past the low-friction rubber ring 52 near the side of the one-way pump 2. At this time, the pressure in the working chamber is low, and the slide 64 is kept in a relatively outward position under the preload of the telescopic spring 63. The internal expansion friction component 62 is in an untriggered state.

[0051] When the telescopic plunger 61 moves backward during the liquid inlet stage, its small-diameter outer wall near the one-way pump 2 and the inner wall of the low-friction rubber ring 52 form an outlet 614. The hydraulic power unit 3 provides a stable pressure buffer to the buffer tank 51 on the inner wall of the plunger cylinder 5 through the buffer connection pipe 31. The buffer flows out through the outlet 614, forming a liquid phase isolation film between the outer wall of the telescopic plunger 61 and the inner wall of the plunger cylinder 5, separating the corrosive working medium from the inner wall of the plunger cylinder 5 and the low-friction rubber ring 52, thus preventing corrosion.

[0052] After the liquid inlet stroke is completed, the crankshaft 11 and the swing connecting rod 12 drive the plunger frame 13 to move the telescopic plunger 61 in the opposite direction and enter the liquid outlet stage. The forward movement of the telescopic plunger 61 squeezes the corrosive medium in its front working chamber, causing its pressure to rise rapidly. At this time, the liquid inlet valve 23 inside the one-way pump 2 is closed, while the liquid outlet valve 24 is opened under high pressure. The pressurized corrosive medium is discharged from the working chamber of the plunger cylinder 5 through the pressurization chamber 25, through the liquid outlet valve 24 and the liquid outlet pipe 22 under high pressure. At the same time, the forward movement of the telescopic plunger 61 gradually closes the liquid outlet 614.

[0053] During the liquid discharge stage, as the pressure of the corrosive medium in the working chamber increases sharply, the high-pressure force is directly transmitted through the medium to the end face of the sliding column 64 located at the front end of the telescopic plunger 61. This high-pressure force overcomes the resistance of the telescopic spring 63 and pushes the sliding column 64 to slide relative to the forward-moving telescopic plunger 61 towards the plunger frame 13. The sliding of the sliding column 64 directly squeezes the multiple extrusion rods 626 that abut against its outer wall. The extrusion rods 626 move towards the ball 623 in the extrusion groove 624, compressing the extrusion spring 625 and transmitting the axial thrust to the ball 623 in the limiting groove 622.

[0054] Under the push of the extrusion rod 626, the ball 623 moves radially outward along the limiting groove 622. The outer wall of the ball 623 pushes up the expansion membrane 621 fixedly installed on the outer wall of the telescopic plunger 61, causing it to elastically deform and expand outward. The expansion of the expansion membrane 621 causes its outer surface to fit tightly against the inner wall of the plunger cylinder 5, forming a high-pressure auxiliary seal. The clamping force of this seal is proportional to the system working pressure, realizing pressure adaptive sealing and effectively preventing the leakage of corrosive media from the main sliding pair under high pressure.

[0055] At the same time, the outer wall of the larger diameter section of the telescopic plunger 61 always maintains a sliding seal with the two low-friction rubber rings 52, forming a basic seal. Under the combined action of the high-pressure adaptive seal and the basic seal, the corrosive liquid is completely confined in the pressurized process and is stably output from the outlet pipe 22 in a high-pressure and high-flow state.

[0056] When the pressurization stroke of the plunger ends and the pressure drops, the restoring force of the compression spring 625 and the extension spring 63 causes the slide 64, the compression rod 626, the ball 623 and the expansion diaphragm 621 to return to their original positions in sequence, releasing the sealing contact force and preparing for the next working cycle. Multiple plunger cylinders 5 and the adaptive deformation mechanism 6 work alternately under the drive of the crankshaft, thereby achieving continuous, high-pressure, high-flow power output with excellent corrosion resistance.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-pressure, high-flow, corrosion-resistant power drive module, comprising a crankcase (1), a one-way pump (2) and a hydraulic power unit (3) fixedly installed outside the crankcase (1), wherein a plurality of plunger brackets (13) are slidably connected to the inner wall of the crankcase (1), characterized in that: It also includes multiple plunger cylinders (5) fixedly installed inside the crankcase (1), and the plunger cylinders (5) are provided with an adaptive deformation mechanism (6). The adaptive deformation mechanism (6) includes a telescopic plunger (61), which is fixedly connected to a corresponding plunger frame (13). A sliding column (64) is slidably connected to the inner wall of the telescopic plunger (61). An expansion friction assembly (62) is provided on the inner wall of the telescopic plunger (61). During the liquid discharge stage, the telescopic plunger (61) moves towards the direction of the one-way pump (2), causing the sliding column (64) to slide into the telescopic plunger (61) under the influence of high pressure, triggering the expansion friction assembly (62) to unfold, so that it fits tightly against the inner wall of the plunger cylinder (5) to form a high-pressure adaptive seal.

2. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 1, characterized in that: The inner wall of the plunger cylinder (5) is provided with a buffer tank (51). Two low-friction rubber rings (52) are fixedly connected to the inner wall of the buffer tank (51). The outer wall of the telescopic plunger (61) is provided with a ramp (613) to form two sections with different diameters. The section near the plunger frame (13) is in sliding sealing cooperation with the low-friction rubber ring (52), and the section near the one-way pump (2) forms an annular outlet (614) between the section and the low-friction rubber ring (52).

3. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 2, characterized in that: During the liquid inlet phase, the telescopic plunger (61) moves toward the plunger holder (13), and the buffer solution in the buffer tank (51) flows out from the outlet (614), forming a liquid phase isolation barrier between the telescopic plunger (61) and the plunger cylinder (5).

4. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 2, characterized in that: The inner wall of the telescopic plunger (61) is provided with a through hole (611) and a telescopic cavity (612). The telescopic cavity (612) is connected to the buffer tank (51) through the through hole (611). A telescopic spring (63) is connected between the end of the sliding column (64) near the plunger frame (13) and the telescopic cavity (612).

5. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 1, characterized in that: The expansion friction assembly (62) includes an expansion membrane (621) fixedly installed on the outer wall of the telescopic plunger (61). The inner wall of the telescopic plunger (61) is provided with a plurality of limiting grooves (622) and a plurality of extrusion grooves (624). The limiting grooves (622) are connected to the corresponding extrusion grooves (624).

6. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 5, characterized in that: The limiting groove (622) is provided with a ball (623), the inner wall of the extrusion groove (624) is slidably connected with an extrusion rod (626), and an extrusion spring (625) is connected between the extrusion rod (626) and the extrusion groove (624).

7. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 6, characterized in that: The outer wall of the ball (623) abuts against the expansion membrane (621) and the corresponding extrusion rod (626) respectively, and the end of the extrusion rod (626) away from the ball (623) abuts against the outer wall of the slide (64).

8. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 2, characterized in that: The outer wall of the hydraulic power device (3) is connected to a buffer connection pipe (31). The hydraulic power device (3) is connected to multiple buffer tanks (51) through the buffer connection pipe (31), and the pressure of the buffer tanks (51) is adjusted in real time by the hydraulic power device (3).

9. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 1, characterized in that: The one-way pump (2) is provided with an inlet pipe (21), an outlet pipe (22) and a pressurizing chamber (25). An inlet valve (23) is installed between the inlet pipe (21) and the pressurizing chamber (25). An outlet valve (24) is installed between the outlet pipe (22) and the pressurizing chamber (25). The pressurizing chamber (25) is connected to the interior of the plunger cylinder (5).

10. The high-pressure, high-flow, corrosion-resistant power drive module according to claim 1, characterized in that: A drive motor (4) is provided on the outside of the crankcase (1). A rotating crankshaft (11) is rotatably connected to the inner wall of the crankcase (1). The output shaft of the drive motor (4) is fixedly connected to the rotating crankshaft (11). A plurality of swing connecting rods (12) are fixedly connected to the outer wall of the rotating crankshaft (11). The swing connecting rods (12) are connected to the corresponding plunger frame (13) in a transmission connection.

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