420mpa 12l flow super high pressure pump set

Abstract

The utility model relates to high pressure pump field discloses 420MPa 12L flow superhigh pressure pump group, flow is 12L / min, including at least two superhigh pressure plunger pump, superhigh pressure plunger pump all is equipped with high pressure water outlet, still includes distribution unit, a plurality of nozzles and controller, and superhigh pressure plunger pump's high pressure water outlet all and distribution unit intercommunication, and distribution unit and a plurality of nozzles intercommunication, superhigh pressure plunger pump includes oil pump unit, and the power source of oil pump unit is oil pump motor, and controller and oil pump motor electricity are connected, when the number of open nozzle changes, controller recalculates flow according to nozzle number and controls oil pump motor to switch to corresponding rotating speed to make the output pressure of superhigh pressure plunger pump keep stable. Aims at providing 420MPa, 12L / min high pressure water flow for high pressure water jet.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure pumps, specifically to a 420MPa 12L flow ultra-high pressure pump set. Background Technology

[0002] Ultra-high pressure water jet technology, with its advantages of cold cutting, no heat-affected zone, and environmental friendliness, has been widely used in aerospace, shipbuilding, energy equipment, composite material processing, and building demolition. As the core power source of this technology, the performance (pressure, flow rate, stability, reliability, and efficiency) of the ultra-high pressure pump set directly determines the processing capacity and economy of the water jet system.

[0003] Currently, commercial waterjet cutting systems generally use three- or five-cylinder reciprocating plunger pumps with operating pressures ranging from 300 MPa to 380 MPa, and a flow rate typically of 3.7 L / min. These pump sets drive the plungers to reciprocate through a crankshaft connecting rod mechanism or a swashplate mechanism, and work in conjunction with a check valve assembly to achieve continuous output of high-pressure water.

[0004] However, with the increasing demands of industrial processing for efficiency, thick plate cutting capabilities (requiring higher kinetic energy), and the handling of large structural components, and with the improvement of laser cutting efficiency, the market has put forward an urgent requirement for pump sets to have both higher pressure (≥400MPa) and greater flow rate (≥10L / min) in order to compete with laser cutting.

[0005] Currently, high-pressure pump sets exist on the market, but increasing the pressure does not guarantee a larger flow rate; conversely, pump sets with larger flow rates cannot guarantee high pressure, making them unable to effectively compete with laser cutting. Therefore, a pump set that combines both high pressure and larger flow rate is needed to capture market share. Utility Model Content

[0006] The present invention aims to provide an ultra-high pressure pump set with a flow rate of 12L and a pressure of 420MPa, which is intended to provide a high pressure water flow of 12L / min for high pressure water jet.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a 420MPa 12L flow ultra-high pressure pump set, comprising at least two ultra-high pressure plunger pumps, each of which is equipped with a high-pressure water outlet, and also comprising a distribution unit, several nozzles and a controller, wherein the high-pressure water outlets of the ultra-high pressure plunger pumps are all connected to the distribution unit, and the distribution unit is connected to several nozzles. The ultra-high pressure plunger pump includes an oil pump unit, the power source of which is an oil pump motor. The controller is electrically connected to the oil pump motor. When the number of open nozzles changes, the controller recalculates the flow rate based on the number of nozzles and controls the oil pump motor to switch to the corresponding speed, thereby keeping the output pressure of the ultra-high pressure plunger pump stable.

[0008] The beneficial effects of this plan are: 1. Adjust the oil pump speed through the controller to ensure stable output water pressure. For example, when the number of nozzles is reduced, reconfirm the flow rate required by a single oil pump motor. According to the formula: displacement of a single motor × speed = flow rate, reduce the speed of the oil pump motor.

[0009] 2. Stable water pressure ensures efficiency and avoids situations where the water cannot be cut or the force is insufficient.

[0010] Furthermore, the ultra-high pressure plunger pump also includes at least two speed detection units. The speed detection units are used to detect the speed of the corresponding ultra-high pressure plunger pump's oil pump motor. When one speed detection unit detects that the speed of one of the ultra-high pressure plunger pumps has decreased, it sends a signal to the controller, and the controller controls the other oil pump motor to increase its speed.

[0011] The core of this 12L / min flow rate setup lies in a coordinated flow control mechanism. The system integrates two ultra-high pressure plunger pumps with a rated flow rate of 6L / min. The actual output flow of each pump unit follows the basic principle of "flow rate = displacement × speed," where displacement is determined by the plunger diameter and stroke, and is a fixed value; speed is the number of reciprocating strokes of the plunger per minute, and is a controllable variable.

[0012] A distribution unit serves as the system's central hub, collecting high-pressure water from two pump units at its input and distributing it to one or more working nozzles at its output. This distribution controller has a built-in or connected speed detection unit to monitor the actual reciprocating speed (oil pump motor speed) of the driving plungers of each pump unit in real time.

[0013] The distribution controller executes the following dynamic adjustment strategy: when the sensor detects that the speed of one of the pump units (such as pump unit A) decreases due to a fault or efficiency degradation, this information is transmitted to the controller in real time. The control logic within the controller immediately performs calculations and issues a command to another normally operating pump unit (such as pump unit B) to increase the power of its drive motor, thereby increasing the reciprocating speed of the plunger in pump unit B accordingly.

[0014] The essence of this adjustment process is to compensate for the flow loss caused by the decrease in speed of the faulty pump unit by increasing the speed of the normal pump unit (i.e., increasing the "speed" factor in the formula), so as to ensure that the total output flow of the system is dynamically maintained at the preset target of 12L / min.

[0015] Furthermore, the ultra-high pressure plunger pump includes a reciprocating intensifier, which includes a cylinder body. The cylinder body has a low-pressure chamber, and a piston in the low-pressure chamber is connected to a low-pressure cylinder piston. A high-pressure chamber is provided on each side of the low-pressure chamber, and a high-pressure plunger is provided on each side of the low-pressure cylinder piston. The piston at the end of the high-pressure plunger is connected to the high-pressure chamber. The feature is that a sealing assembly is provided at the junction of the low-pressure chamber and the high-pressure chamber. The sealing assembly includes a sealing ring and a rubber O-ring. The sealing ring is disposed between the inner wall of the high-pressure chamber and the high-pressure plunger. The sealing ring has a notch on the cross-section near the inner wall of the high-pressure chamber, and the cross-section of the rubber O-ring fills the notch.

[0016] The beneficial effects of this plan are: 1. To increase the pressure and flow rate of the high-pressure pump, a larger plunger rod cross-sectional area and reciprocating frequency are required. This also leads to greater and faster pressure changes in the high-pressure chamber. If the liquid in the high-pressure chamber leaks more easily, the designed pressure and flow rate cannot be achieved. In this solution, a groove is cut into the inner wall of the high-pressure chamber at the junction of the low-pressure chamber and the high-pressure chamber. A sealing component is installed in the groove to avoid the above-mentioned leakage or failure.

[0017] Specifically, the sealing ring uses a wear-resistant material that comes into direct contact with the high-pressure plunger. However, wear-resistant materials typically lack elasticity and have limited expansion and contraction due to temperature variations, thus failing to guarantee continuous pressure against the high-pressure plunger. In this solution, a notch is provided on the side of the sealing ring near the inner wall of the high-pressure chamber. A rubber O-ring is then used to pressurize the sealing ring. The rubber O-ring is highly sensitive to temperature; during liquid pressurization, the high-pressure plunger's temperature rises, affecting the rubber O-ring and causing it to expand, further pressing against the sealing ring and ensuring a tight seal. On the other hand, the sealing ring protects the sealing ring from corrosion, thereby enhancing the reliability and durability of the rubber O-ring.

[0018] 2. Through structural design alone, sealing performance has been enhanced, costs have been controlled, and structural reliability has been improved.

[0019] Furthermore, the diameter, stroke, and minimum cross-sectional area of ​​the high-pressure plunger must satisfy the following formula: ; Q—Theoretical flow rate, L / min; d—Diameter of the high-pressure plunger, mm; S—High-pressure plunger stroke, mm; n—Number of reciprocating cycles of the high-pressure plunger, min -1 ; Z—Number of high-pressure plungers.

[0020] Furthermore, the minimum cross-sectional area of ​​the high-pressure plunger must satisfy the following formula: ; σ y —Compressive stress at the cross section of the high-pressure plunger, MPa; F—plunging force, taking the maximum plunging force, in N; A—Cross-sectional area of ​​the plunger, taking the minimum cross-sectional area, mm2; [σ y — Allowable stress of the plunger, MPa, [σ] y ]= σ z / n a ; σ z — Yield strength of the plunger, MPa; n a —The safety factor for the plunger is generally taken as 3-4.

[0021] Furthermore, the cylinder body within the high-pressure cylinder range is made of stainless steel, and the wall thickness needs to meet the following formula: ; δ—Cylinder wall thickness within the high-pressure cylinder range, in mm; r1 — the inner radius of the cylinder within the high-pressure cylinder range, in mm; [σ]——Allowable stress in the cylinder body within the high-pressure cylinder range, MPa; P – Maximum pressure of the fluid being transported, MPa.

[0022] Furthermore, it includes a fluid pretreatment unit, which comprises a pre-filter, a water pump, and a post-filter connected in sequence. The reciprocating booster includes a low-pressure water inlet, and the outlet of the post-filter is connected to the low-pressure water inlet of the reciprocating booster.

[0023] Furthermore, it also includes an oil pump unit, a hydraulic oil circulation cooling circuit, and a cooling unit. The hydraulic oil circulation cooling circuit includes a first circuit and a second circuit. The low-pressure chamber of the reciprocating turbocharger is provided with a high-temperature hydraulic oil outlet and a hydraulic oil coolant inlet. The high-temperature hydraulic oil outlet, the first pipeline, the cooling unit, and the hydraulic oil coolant inlet are connected in sequence to form a circuit.

[0024] Furthermore, it also includes an accumulator and a reversing valve assembly. Each high-pressure chamber is equipped with a high-pressure water outlet, and both high-pressure water outlets are connected to the reversing valve assembly. The reversing valve assembly is used to integrate the alternating direction of the ultra-high pressure water flow output by the reciprocating booster into a continuous ultra-high pressure water flow output in a single direction. The accumulator is connected to the outlet of the reversing valve assembly and is used to store ultra-high pressure water and smooth out output pressure pulsations.

[0025] Furthermore, it also includes an oil pump unit and an intelligent control and safety protection unit. The intelligent control and safety protection unit includes a proportional servo control system, a pressure sensor, and a high-pressure water unloading valve. The pressure sensor is electrically connected to the servo control system and the high-pressure water unloading valve, respectively. The proportional servo control system is electrically connected to the helical gear oil pump unit. The pressure sensor is installed in the high-pressure pipeline upstream or downstream of the accumulator, and the high-pressure water unloading valve is installed in the high-pressure water pipeline. The proportional servo control system receives the signal from the pressure sensor, and when the monitored pressure exceeds a preset safety threshold, it controls the high-pressure water unloading valve to open and release pressure.

[0026] This solution also has the following effects: 1. The sealing ring is made of modified material, ensuring that the high-pressure pump does not easily leak pressure while increasing pressure, significantly improving sealing reliability and lifespan under extreme operating conditions. The notch is located on the side of the sealing ring closer to the low-pressure chamber; correspondingly, the side of the sealing ring closer to the low-pressure chamber is thinner and more prone to deformation.

[0027] Therefore, when the high-pressure plunger moves away from the low-pressure chamber, the space inside the high-pressure chamber is compressed, and the pressure inside the high-pressure chamber increases. At this time, the pressure is more likely to leak through the sealing ring into the low-pressure chamber. However, in this design, the high-pressure plunger drives the thicker part of the sealing ring (the part away from the notch) to rotate around the circular cross-section of the rubber O-ring, so that the thicker part of the sealing ring and the rubber O-ring overlap together and squeeze the inner wall of the high-pressure chamber, thereby improving the sealing effect. Conversely, when the high-pressure plunger moves towards the low-pressure chamber, the high-pressure chamber absorbs water under negative pressure, and the pressure inside the high-pressure chamber decreases. At this time, the pressure is less likely to leak through the sealing ring into the low-pressure chamber. In this case, in this design, the thicker part of the sealing ring no longer overlaps with the rubber O-ring and squeezes the inner wall of the high-pressure chamber, thereby reducing the wear of the sealing ring.

[0028] 2. The cleanliness and chemical stability of the input water source are ensured through an integrated fluid pretreatment unit (pre-filtration → water pump pressurization → post-deep filtration and passivation treatment).

[0029] 3. Strength design is carried out based on the plunger compressive stress verification formula and the thick-walled cylinder formula. By reasonably selecting the safety factor, the long-term service safety of the high-pressure plunger (minimum cross-sectional compressive strength) and the stainless steel cylinder (wall thickness bearing capacity) under the working condition of 420MPa is ensured, and the risk of fatigue failure is significantly reduced.

[0030] 4. The proportional servo control system adjusts the oil pressure, flow rate, and reversing action in real time to ensure that the output parameters accurately match the set value (420MPa / 12L); the pressure sensor is linked with the high-pressure water unloading valve, and the overpressure relief is triggered by the control system (threshold can be set), forming a closed-loop mechanism of "monitoring-early warning-protection", which greatly improves the inherent safety of the equipment. Attached Figure Description

[0031] Figure 1 A three-dimensional diagram of an embodiment; Figure 2 This is a cross-sectional schematic diagram of the reciprocating turbocharger in an embodiment; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the allocation unit connection in an embodiment. Detailed Implementation

[0032] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: water pump 1, post-filter water device 2, air source treatment unit 3, pre-filter water device 4, pressure sensor 5, reciprocating intensifier 6, cylinder 61, high-pressure plunger 62, low-pressure cylinder piston 63, retaining ring 641, sealing ring 642, rubber O-ring 643, high-temperature hydraulic oil outlet 65, hydraulic oil coolant inlet 66, low-pressure water inlet 67, high-pressure water outlet 68, reversing valve assembly 7, accumulator 8, proportional servo control system 9, ultra-high pressure plunger pump 10, distribution unit 11, nozzle 12.

[0033] Example The implementation examples are basically as follows Figures 1-3 As shown: 420MPa 12L flow ultra-high pressure pump set, including two ultra-high pressure plunger pumps 10. Each ultra-high pressure plunger pump 10 includes a fluid pretreatment unit, an ultra-high pressure generation unit, a hydraulic oil circulation cooling circuit, a cooling unit, and an intelligent control and safety protection unit.

[0034] like Figure 1 As shown, the fluid pretreatment unit includes a pre-filter water device 4, a water pump 1, and a post-filter water device 2 connected in sequence. The ultra-high pressure generation unit includes a reciprocating booster 6, a reversing valve group 7, an accumulator 8, and an oil pump unit, which is a helical gear oil pump unit.

[0035] like Figure 2As shown, the reciprocating turbocharger 6 includes a cylinder body 61, within which a low-pressure chamber is formed. A horizontal piston within the low-pressure chamber is connected to a low-pressure cylinder piston 63. The low-pressure chamber has four oil ports, arranged symmetrically in pairs on both sides. These two ports are a high-temperature hydraulic oil outlet 65 and a hydraulic oil coolant inlet 66. A high-pressure chamber is connected to each side of the low-pressure chamber. Both the high-pressure and low-pressure chambers are strip-shaped, with the high-pressure chamber having a smaller cross-section than the low-pressure chamber. A low-pressure water inlet 67 and a high-pressure water outlet 68 are located at the end of the high-pressure chamber furthest from the low-pressure chamber. The outlet of the post-filter water device 2 and the low-pressure water inlet... The piston 63 of the low-pressure cylinder is connected to port 67. A high-pressure plunger 62 is integrally formed on both sides of the low-pressure cylinder piston 63. The end of the high-pressure plunger 62 is horizontally connected to the high-pressure chamber. An installation groove is provided at the end of the high-pressure chamber near the low-pressure chamber, i.e., the installation groove is located at the junction of the low-pressure chamber and the high-pressure chamber. A retaining ring 641, a sealing ring 642, and a rubber O-ring are provided in the installation groove. The sealing ring 642 is made of a modified material; in this embodiment, the modified material is polyphenylene ester / glass fiber modified PTFE sealing material. The sealing ring 642 is located between the inner wall of the high-pressure chamber and the high-pressure plunger 62, perpendicular to the axial direction of the high-pressure plunger 62. Figure 3 As shown, the sealing ring 642 has a notch on the side of the high-pressure chamber near the inner wall of the high-pressure chamber. In the axial direction of the high-pressure plunger 62, the notch is located on the side of the sealing ring 642 away from the low-pressure chamber. The cross section of the rubber O-ring fills the notch. The retaining ring 641 is located on the side of the sealing ring 642 near the low-pressure chamber. The retaining ring 641 is bolted to the side wall of the low-pressure chamber (not shown in the figure).

[0036] The diameter, stroke, and minimum cross-sectional area of ​​the high-pressure plunger 62 must satisfy the following formula: ; Q—Theoretical flow rate, L / min; d—Diameter of the high-pressure plunger, mm; S—High-pressure plunger stroke, mm; n—Number of reciprocating cycles of the high-pressure plunger, min -1 ; Z—Number of high-pressure plungers.

[0037] The minimum cross-sectional area of ​​a high-pressure plunger must satisfy the following formula: ; σ y —Compressive stress at the cross section of the high-pressure plunger, MPa; F—plunging force, taking the maximum plunging force, in N; A—Cross-sectional area of ​​the plunger, taking the minimum cross-sectional area, mm2; [σ y — Allowable stress of the plunger, MPa, [σ] y ]= σ z / n a ; σ z — Yield strength of the plunger, MPa; n a —The safety factor for the plunger is generally taken as 3-4.

[0038] The cylinder body within the high-pressure cylinder range is made of stainless steel, and the wall thickness must meet the following formula: ; δ—Cylinder wall thickness within the high-pressure cylinder range, in mm; r1 — the inner radius of the cylinder within the high-pressure cylinder range, in mm; [σ]——Allowable stress in the cylinder body within the high-pressure cylinder range, MPa; P – Maximum pressure of the fluid being transported, MPa.

[0039] The hydraulic oil circulation cooling circuit includes a first circuit and a second circuit. The high-temperature hydraulic oil outlet 65, the first pipeline, the cooling unit, and the hydraulic oil coolant inlet 66 are sequentially connected to form a circuit. The cooling unit is a hydraulic oil cooler as used in the prior art, used to cool the hydraulic oil. The two high-pressure water outlets 68 of the reciprocating booster 6 are both connected to the reversing valve group 7. The reversing valve group 7 is used to integrate the alternating direction ultra-high pressure water flow output by the reciprocating booster 6 into a continuous ultra-high pressure water flow output in a single direction. The accumulator 8 is connected to the outlet of the reversing valve group 7 and is used to store ultra-high pressure water and smooth out output pressure pulsations.

[0040] The intelligent control and safety protection unit includes a proportional servo control system 9, a pressure sensor 5, and a high-pressure water unloading valve. The pressure sensor 5 is electrically connected to both the servo control system and the high-pressure water unloading valve. The proportional servo control system 9 is electrically connected to the helical gear oil pump unit. The pressure sensor 5 is installed in the high-pressure pipeline upstream or downstream of the accumulator 8. The high-pressure water unloading valve is installed in the high-pressure water pipeline. The proportional servo control system 9 receives the signal from the pressure sensor 5. When the monitored pressure exceeds a preset safety threshold, it controls the high-pressure water unloading valve to open and release pressure.

[0041] The air source processing unit 3 is configured as needed, including a three-unit air source processing module, which is used to filter, reduce pressure and lubricate the drive air source, and provide a clean, stable and lubricated air source to the pneumatically controlled components in the system.

[0042] like Figure 4 As shown, it also includes a distribution unit 11, several nozzles 12 and a controller. The high-pressure water outlets 68 of the two ultra-high pressure plunger pumps 10 are connected to the distribution unit 11. The distribution unit 11 is connected to several nozzles 12. Each nozzle 12 is equipped with a solenoid valve (not shown in the figure) between it and the distribution unit. The power source of the oil pump unit is an oil pump motor, and it also includes at least two speed detection units. Both speed detection units are speed sensors installed on the oil pump motor. The controller is electrically connected to the oil pump motor and the speed detection units. The speed sensors are used to detect the speed of the oil pump motor of the corresponding ultra-high pressure plunger pump 10. When the nozzle 12 is opened or closed by the solenoid valve, the solenoid valve sends a signal to the controller. The controller recalculates the flow rate according to the number of nozzles 12 and controls the oil pump motor to switch to the corresponding speed, thereby keeping the output pressure of the ultra-high pressure plunger pump 10 stable.

[0043] When a speed detection unit detects a decrease in the speed of one of the ultra-high pressure plunger pumps 10, it sends a signal to the controller, which then controls the other oil pump motor to increase its speed.

[0044] In this embodiment, the oil pump motors are all MR-J2S-100A servo motors; the controller is an STM32 microcontroller.

[0045] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A 420MPa 12L flow rate ultra-high pressure pump set, characterized in that: It includes at least two ultra-high pressure plunger pumps, each of which is equipped with a high-pressure water outlet. It also includes a distribution unit, several nozzles, and a controller. The high-pressure water outlets of the ultra-high pressure plunger pumps are all connected to the distribution unit, and the distribution unit is connected to several nozzles. The ultra-high pressure plunger pump includes an oil pump unit, the power source of which is an oil pump motor. The controller is electrically connected to the oil pump motor. When the number of open nozzles changes, the controller recalculates the flow rate based on the number of nozzles and controls the oil pump motor to switch to the corresponding speed, thereby keeping the output pressure of the ultra-high pressure plunger pump stable.

2. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 1, characterized in that: The ultra-high pressure plunger pump also includes at least two speed detection units. The speed detection units are used to detect the speed of the oil pump motor of the corresponding ultra-high pressure plunger pump. When one speed detection unit detects that the speed of one of the ultra-high pressure plunger pumps has decreased, it sends a signal to the controller, and the controller controls the other oil pump motor to increase its speed.

3. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 2, characterized in that: The ultra-high pressure plunger pump includes a reciprocating intensifier, which includes a cylinder body. A low-pressure chamber is located within the cylinder body. A piston in the low-pressure chamber is connected to a low-pressure cylinder piston. A high-pressure chamber is located on each side of the low-pressure chamber. A high-pressure plunger is located on each side of the low-pressure cylinder piston. The piston at the end of the high-pressure plunger is connected to the high-pressure chamber. The pump is characterized by a sealing assembly at the junction of the low-pressure chamber and the high-pressure chamber. The sealing assembly includes a sealing ring and a rubber O-ring. The sealing ring is positioned between the inner wall of the high-pressure chamber and the high-pressure plunger. A notch is provided on the cross-section of the sealing ring near the inner wall of the high-pressure chamber, and the cross-section of the rubber O-ring fills the notch.

4. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 1, characterized in that: The diameter, stroke, and minimum cross-sectional area of ​​the high-pressure plunger must satisfy the following formula: ； Q—Theoretical flow rate, L / min; d—Diameter of the high-pressure plunger, mm; S—High-pressure plunger stroke, mm; n—Number of reciprocating cycles of the high-pressure plunger, min -1 ; Z—Number of high-pressure plungers.

5. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 4, characterized in that: The minimum cross-sectional area of ​​a high-pressure plunger must satisfy the following formula: ； σ y —Compressive stress in the cross section of the high-pressure plunger, MPa; F—plunging force, taking the maximum plunging force, in N; A—Cross-sectional area of ​​the plunger, taking the minimum cross-sectional area, mm2; [σ y — Allowable stress of the plunger, MPa, [σ] y ]= σ z / n a ; σ z — Yield strength of the plunger, MPa; n a —The safety factor for the plunger is generally taken as 3-4.

6. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 5, characterized in that: The cylinder body within the high-pressure cylinder range is made of stainless steel, and the wall thickness must meet the following formula: ； δ—Cylinder wall thickness within the high-pressure cylinder range, in mm; r1 — the inner radius of the cylinder within the high-pressure cylinder range, in mm; [σ]——Allowable stress in the cylinder body within the high-pressure cylinder range, MPa; P – Maximum pressure of the fluid being transported, MPa.

7. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 6, characterized in that: It includes a fluid pretreatment unit, which includes a pre-filter, a water pump, and a post-filter connected in sequence. The reciprocating booster includes a low-pressure water inlet, and the outlet of the post-filter is connected to the low-pressure water inlet of the reciprocating booster.

8. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 7, characterized in that: It also includes an oil pump unit, a hydraulic oil circulation cooling circuit, and a cooling unit. The hydraulic oil circulation cooling circuit includes a first circuit and a second circuit. The low-pressure chamber of the reciprocating turbocharger is provided with a high-temperature hydraulic oil outlet and a hydraulic oil coolant inlet. The high-temperature hydraulic oil outlet, the first pipeline, the cooling unit, and the hydraulic oil coolant inlet are connected in sequence to form a circuit.

9. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 8, characterized in that: It also includes an accumulator and a reversing valve assembly. Each high-pressure chamber is equipped with a high-pressure water outlet. Both high-pressure water outlets are connected to the reversing valve assembly. The reversing valve assembly is used to integrate the ultra-high-pressure water flow that alternately changes direction from the reciprocating booster into a continuous ultra-high-pressure water flow that is output in a single direction. The accumulator is connected to the outlet of the reversing valve assembly and is used to store ultra-high-pressure water and smooth out output pressure pulsations.

10. The 420MPa 12L flow rate ultra-high pressure pump set according to claim 9, characterized in that: It also includes an oil pump unit and an intelligent control and safety protection unit. The intelligent control and safety protection unit includes a proportional servo control system, a pressure sensor, and a high-pressure water unloading valve. The pressure sensor is electrically connected to the servo control system and the high-pressure water unloading valve, respectively. The proportional servo control system is electrically connected to the helical gear oil pump unit. The pressure sensor is installed in the high-pressure pipeline upstream or downstream of the accumulator. The high-pressure water unloading valve is installed in the high-pressure water pipeline. The proportional servo control system receives the signal from the pressure sensor. When the monitored pressure exceeds the preset safety threshold, it controls the high-pressure water unloading valve to open and release pressure.

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