Pulse water pressure generator
By driving the booster plunger to move periodically through the crank connecting rod, combined with the time-sharing action of the check valve, an adaptive pulse water pressure is formed, which solves the problem of high pressure balance in the processing of large-size parts in water expansion molding equipment, and achieves efficient and low-cost molding effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CELANGE (SHENZHEN) TECHNOLOGY CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-16
AI Technical Summary
Existing hydroforming equipment struggles to balance continuous high-pressure water in the processing of large-size parts, resulting in high processing costs and expensive equipment, and is unable to effectively form large-size thin plates or open sheet metal parts.
The crank connecting rod drives the booster plunger to move periodically, forming pulsed water pressure. Combined with the time-sharing action of the pressure holding and water replenishment check valves, the flow rate and pressure are adaptively adjusted to achieve adaptive pulsed water pressure output.
It improves the quality and precision of workpiece forming, reduces stress concentration and springback, lowers production costs, and is suitable for forming large-size thin plates and open sheet metal parts.
Smart Images
Figure CN224359220U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power source technology for water expansion molding, specifically a pulse water pressure generator. Background Technology
[0002] The power source for existing hydroforming equipment is continuous high-pressure water. In order to balance the continuous high-pressure water, it is usually necessary to use auxiliary equipment with high rigidity and high pressure. Even so, existing hydroforming equipment can only process some closed small-sized thin sheet parts. For large-sized parts, since there is no way to balance the huge thrust caused by continuous high pressure on large-area parts, the forming of large-sized thin sheets of several square meters or small-to-medium-sized open sheet metal still needs to be processed by stamping machines. Stamping machines are expensive in terms of impact resistance, and large stamping machines often require millions to tens of millions of yuan to purchase, which is very costly.
[0003] Patent CN218439642U discloses a booster cylinder structure for a three-way hydroforming machine, but its design aims to prevent liquid leakage from the booster chamber into the piston chamber and contaminating the hydraulic oil inside. Patent CN208697189U discloses a high-pressure water generator using a gear pump, comprising a body and a servo controller, servo drive, gear pump, oil tank, booster, accumulator, and other devices mounted on the body. This device uses a fixed-displacement oil pump, which itself does not have variable displacement control. However, the gear pump is connected to a permanent magnet motor, which in turn is connected to a servo control system. Thus, the servo control system can achieve variable displacement control of the permanent magnet motor, thereby controlling the oil pressure output of the gear pump. None of the above devices address how to balance the continuous high-pressure water. Utility Model Content
[0004] The purpose of this invention is to provide a pulsed water pressure generator, which uses a crank connecting rod to periodically drive the booster plunger to move to form pulsed water pressure, thereby improving the processing quality of workpiece water expansion molding, while avoiding the generation of continuous huge impacts.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] A pulsed hydraulic generator includes a crank connecting rod, a cylinder, a cylinder slide, a booster cylinder, and an output pipeline assembly. One end of the crank connecting rod is connected to a crank drive device, and the other end extends into the cylinder and is connected to a cylinder piston inside the cylinder. The cylinder is movably disposed in the cylinder slide, and the end of the cylinder slide away from the crank connecting rod is connected to the booster cylinder. The booster cylinder contains a booster plunger, and the booster plunger is connected to the cylinder via a plunger connecting rod. The booster cylinder is integrally connected to the cylinder slide via a connecting sleeve. The output end of the booster cylinder away from the cylinder slide is provided with an output pipeline assembly.
[0007] The output pipeline assembly includes a three-way component, a high-pressure water output pipeline, and a water supply pipeline. The high-pressure water output pipeline, the water supply pipeline, and the output end of the turbocharger cylinder are respectively connected to the corresponding ports on the three-way component. The high-pressure water output pipeline is equipped with a pressure-holding check valve, and the water supply pipeline is equipped with a water supply check valve.
[0008] The cylinder end is provided with a threaded sleeve, and the upper end of the plunger connecting rod is inserted into the threaded sleeve.
[0009] A spring pressure block is provided on the lower side of the cylinder end. A sealing block is provided inside the connection between the turbocharger cylinder and the cylinder slide. The upper end of the plunger connecting rod is connected to the spring pressure block, and the lower end passes through the sealing block and extends into the turbocharger cylinder and connects with the turbocharger plunger. A spring is fitted on the plunger connecting rod, and the spring is located between the spring pressure block and the sealing block.
[0010] The crank drive device includes a rotary drive device and a drive wheel, wherein the drive wheel is mounted on the output shaft of the rotary drive device, and one end of the crank connecting rod is connected to one side of the drive wheel.
[0011] The advantages and positive effects of this utility model are as follows:
[0012] 1. This utility model utilizes the crank connecting rod to periodically drive the booster plunger to move and form pulsed water pressure. When this utility model is used for water expansion molding, the flow rate and pressure formed in each pulse cycle are adaptive. When the workpiece material is relatively soft, the flow rate and pressure output by this utility model are large and the pressure is low. As the workpiece is continuously stretched and the hardness increases, the flow rate output by this utility model adaptively decreases.
[0013] 2. The output pipeline assembly of this utility model uses two check valves that operate in a time-sharing manner. The pressure-holding check valve dynamically holds pressure to maintain the dynamic deformation of the workpiece, while the water-replenishing check valve replenishes water in a timely manner to form a continuous pulse water pressure. The time-sharing operation of the two check valves does not require a special control mechanism, as they can adaptively reciprocate synchronously with the booster plunger.
[0014] 3. The stress distribution of the workpiece after processing and forming by this utility model is more uniform. This is because the high-frequency micro-deformation allows the material to generate local plastic flow after each pulse impact, thereby gradually adjusting the internal strain distribution and avoiding the generation of a severe stress gradient caused by a single large deformation. Therefore, the workpiece does not spring back after forming and does not require post-forming correction. In addition, this utility model can also reduce stress concentration. The small deformation can reduce the instantaneous stress peak in the local area, thereby reducing the accumulation of residual stress caused by the uneven yield strength of the material (inconsistent size and orientation of the internal crystal domains).
[0015] 4. When this utility model is used for water expansion molding, it will automatically allocate the stretching points of the workpiece to make the stress distribution uniform. The uniformity of the internal microstructure of the material is relative, while the non-uniformity is absolute. When stretching occurs, it will always start from the weakest point. Another characteristic of the material is that once the stretching approaches the plastic deformation strength, the strength will increase non-linearly (with the increase of the strain strength exponent, commonly known as hardening). That is to say, when the next pressure impact pulse arrives, the point that was originally the weakest has become stronger, and the force transmission will automatically start stretching from another weakest point. This forms a mechanism for automatically allocating the stretching points to make the stress distribution uniform.
[0016] 5. When this utility model is used for pulse hydroforming, the mold constrains the free deformation of the material at the end of the forming process. As the single impact flow rate decreases at the end of the forming process, the pressure increases. This forces the workpiece to fit into the mold cavity and corrects the small deviations in the multiple deformation processes, so that the stress distribution is close to the ideal state. At the same time, the mold itself is not subjected to the huge impact of traditional stamping forming. Therefore, there is no need to use high-strength steel to make the mold. Thus, this utility model can significantly reduce production costs while improving the processing quality and accuracy of the workpiece. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of one embodiment of the present invention.
[0018] Figure 2 for Figure 1 A schematic diagram of the movement pulse curve of the connecting rod in one cycle.
[0019] Figure 3 This is a schematic diagram of the pulsed water pressure step formed by this utility model.
[0020] Figure 4 This is a schematic diagram of the pulse water flow step formed by this utility model.
[0021] Figure 5 This is a schematic diagram of another embodiment of the present invention.
[0022] Among them, 1 is the crank drive device, 101 is the crank connecting rod, 2 is the cylinder piston, 3 is the cylinder, 301 is the threaded sleeve, 4 is the pressure holding check valve, 5 is the water replenishment check valve, 6 is the three-way component, 7 is the cylinder slide, 701 is the connecting sleeve, 8 is the turbocharger cylinder, 9 is the turbocharger plunger, 901 is the plunger connecting rod, 10 is the spring pressure block, 11 is the spring, and 12 is the sealing block. Detailed Implementation
[0023] The present invention will now be described in further detail with reference to the accompanying drawings.
[0024] like Figures 1-5 As shown, this utility model includes a crank connecting rod 101, a cylinder 3, a cylinder slide 7, a turbocharger cylinder 8, and an output pipeline assembly. One end of the crank connecting rod 101 is connected to a crank drive device 1, and the other end extends into the cylinder 3 and is connected to the cylinder piston 2 inside the cylinder 3. The cylinder 3 is slidably disposed in the cylinder slide 7, and the end of the cylinder slide 7 away from the crank connecting rod 101 is connected to the turbocharger cylinder 8. The turbocharger cylinder 8 is provided with a turbocharger plunger 9, and the turbocharger plunger 9 is connected to the cylinder 3 through a plunger connecting rod 901. The turbocharger cylinder 8 is connected to the cylinder slide 7 as a whole through a connecting sleeve 701. The output end of the turbocharger cylinder 8 away from the cylinder slide 7 is provided with an output pipeline assembly.
[0025] In operation, the crank connecting rod 101 is driven to move by the crank drive device 1, which in turn drives the cylinder piston 2 to reciprocate inside the cylinder 3. Simultaneously, it drives the cylinder 3 to reciprocate inside the cylinder slide 7. The cylinder 3, in turn, drives the supercharger plunger 9 to reciprocate inside the supercharger cylinder 8 via the plunger connecting rod 901, thereby driving the water inside the supercharger cylinder 8 to be output through the output pipeline assembly. In this embodiment, the crank drive device 1 can be a rotary drive device such as a motor, wherein a concentric drive wheel can be provided on the output shaft of the motor, and one end of the crank connecting rod 101 is connected to one side of the drive wheel, thereby achieving reciprocating pulse movement under the rotational drive of the motor.
[0026] like Figure 1 As shown, the output pipeline assembly includes a three-way element 6, a high-pressure water output pipeline, and a water supply pipeline. The high-pressure water output pipeline, the water supply pipeline, and the output end of the booster cylinder 8 are respectively connected to corresponding ports on the three-way element 6. A pressure-holding check valve 4 is installed on the high-pressure water output pipeline, and a water supply check valve 5 is installed on the water supply pipeline. During operation, the pressure-holding check valve 4 and the water supply check valve 5 operate in a time-sharing manner. The pressure-holding check valve 4 dynamically maintains pressure to sustain the dynamic deformation of the workpiece, while the water supply check valve 5 promptly replenishes water to create a continuous pulse water pressure. The time-sharing operation of the two check valves does not require a special control mechanism; their adaptive operation coordinates with the reciprocating movement of the booster plunger 9. The pressure-holding check valve 4, the water supply check valve 5, and the three-way element 6 are all commercially available products.
[0027] like Figure 1 As shown, in one embodiment of this utility model, the cylinder 3 has a threaded sleeve 301 at its end, and the upper end of the plunger connecting rod 901 is inserted into the threaded sleeve 301 to achieve a fixed connection with the end of the cylinder 3. Figure 5 As shown, in another embodiment of this utility model, a spring pressure block 10 is provided on the lower side of the end of the cylinder 3, and a sealing block 12 is provided inside the connection between the turbocharger cylinder 8 and the cylinder slide 7. The upper end of the plunger connecting rod 901 is connected to the spring pressure block 10, and the lower end passes through the sealing block 12 and extends into the turbocharger cylinder 8 and is connected to the turbocharger plunger 9. A spring 11 is fitted on the plunger connecting rod 901, and the spring 11 is located between the spring pressure block 10 and the sealing block 12. When the plunger connecting rod 901 is driven to move by the cylinder 3, the spring pressure block 10 and the sealing block 12 cooperate to compress the spring 11. When the cylinder 3 returns, the plunger connecting rod 901 automatically resets under the action of the spring 11.
[0028] The working principle of this utility model is as follows:
[0029] like Figures 1-2 As shown, when this utility model is working, the crank connecting rod 101 moves periodically and acts on the cylinder piston 2, thereby causing the cylinder piston 2 to compress the gas in the cylinder 3 to form a pneumatic narrow pulse burst, which is further transmitted to the booster plunger 9 to form a narrow pulse water pressure output.
[0030] Among them, such as Figure 2 As shown, when cylinder piston 2 moves forward to compress air, because cylinder piston 2 moves forward quickly, while cylinder 3 has a large mass and a slow start-up, cylinder piston 2 will first rapidly compress the gas. When cylinder piston 2 reaches the first dead center of its stroke... Figure 2 When the crank connecting rod 101 reaches its maximum forward displacement (the highest point of region B), sufficient explosive force is generated to forcefully and rapidly push cylinder 3 out, thereby driving the supercharger plunger 9 to forcefully and rapidly push out and quickly squeeze the water out of the supercharger cylinder 8, thus generating instantaneous high-power pulse water pressure and high-pressure pulse water flow. The instantaneous pulse power generated at this time is far higher than the rated power of the motor (i.e., the crank drive device 1). However, when the crank connecting rod 101 drives the cylinder piston 2 to return, cylinder 3, due to inertia and lubrication factors, still cannot keep up with the return speed of cylinder piston 2. At this time, cylinder piston 2 quickly returns to near the rear dead center (…). Figure 2 In region D, where the lowest point of region D is the limit displacement of the crank connecting rod 101 moving backward, the pressure inside cylinder 3 will decrease to its limit, reducing the return resistance of cylinder 3 and accelerating the return speed. Therefore, as Figure 2As shown, this invention can compress energy along the time axis under the law of conservation of energy and form a high energy density during the pulse duration. It concentrates the originally evenly distributed motor kinetic energy (i.e., crank drive device 1) into 1 / 6 to 1 / 8 of the cycle of one crank connecting rod 101 movement within one cycle (i.e., Figure 2 The burst of power from region B can reach 6 to 8 times the rated power of the motor.
[0031] Figure 2 In the figure, the vertical axis U represents the reciprocating amplitude of the crank-connecting rod 101, ω represents the reciprocating frequency of the crank-connecting rod 101, t is time, and A, C, and E represent the midpoint of the movement of the crank-connecting rod 101. In this embodiment, the diameter of the booster plunger 9 is 20mm, the reserved stroke is 100mm, the actual maximum stroke is 45mm, the motor (i.e., the crank drive device 1) has a power of 1600 watts, the motor-driven crank connecting rod 101 moves at a frequency of 33.33 times / second, the period is 30ms, the impact pulse width is 3.75ms, the average pulse power during the impact pulse duration is 12.80kW, and the effective energy transmitted by the cylinder piston 2 to the booster plunger 9 within the pulse cycle can reach 40-80 joules. The flow rate and pressure generated per pulse cycle during water expansion molding are adaptive. When the workpiece material is relatively soft (e.g., at the beginning of molding), the output flow rate per pulse generated by this invention is large and the pressure is low. As the workpiece continues to stretch and the hardness increases, the flow rate per pulse will decrease, but the product of flow rate and pressure remains unchanged. Figure 3 The diagram shows the pulse water pressure p output in this embodiment, which increases in a stepwise manner with time. Figure 4 The diagram shows the pulse water flow rate q output in this embodiment. The flow rate decreases stepwise over time. At the beginning of workpiece forming, the workpiece absorbs the impact, the pulse pressure is relatively low, the deformation is large, and the pulse flow rate is relatively large. Later, the workpiece gradually stretches and hardens, the deformation shrinks, so the pulse flow rate decreases and the pulse pressure increases. When the workpiece is completely in contact with the mold, the workpiece has no deformation space when the pulse impact comes again, the pulse flow rate is 0, and the pulse pressure reaches its maximum. At this time, the pressure detection device will display the pressure value and indicate that the forming process is complete.
[0032] In addition, in the output pipeline assembly of this utility model, such as Figure 1 As shown, the pressure-holding check valve 4 and the water-replenishing check valve 5 work in a time-sharing manner. The pressure-holding check valve 4 dynamically maintains pressure as the workpiece deforms. That is, when the high-pressure water output pipeline achieves water pressure impact, the pressure-holding check valve 4 dynamically maintains pressure to ensure the impact water pressure, while the water-replenishing check valve 5 replenishes water in time to ensure the formation of continuous impact water pressure pulses.
[0033] In one application example, this utility model is used for processing and forming ultra-thin, large-format grooved workpieces such as photovoltaic panel waste heat collection and self-heating housings for new energy vehicle batteries. Actual production testing shows that its accuracy can be improved by 30% and its cost reduced by 20%. Furthermore, this utility model can also be applied to various thin-plate automotive parts, refrigerator evaporator water-cooling plates, various small-sized tubular closed metal forming processes, and small-to-medium-sized open sheet metal forming.
Claims
1. A pulse water pressure generator, characterized in that: The device includes a crank connecting rod (101), a cylinder (3), a cylinder slide (7), a turbocharger cylinder (8), and an output pipeline assembly. One end of the crank connecting rod (101) is connected to a crank drive device (1), and the other end extends into the cylinder (3) and is connected to the cylinder piston (2) inside the cylinder (3). The cylinder (3) is slidably disposed in the cylinder slide (7), and the end of the cylinder slide (7) away from the crank connecting rod (101) is connected to the turbocharger cylinder (8). The turbocharger cylinder (8) is provided with a turbocharger plunger (9), and the turbocharger plunger (9) is connected to the cylinder (3) through a plunger connecting rod (901). The turbocharger cylinder (8) is connected to the cylinder slide (7) as a whole through a connecting sleeve (701). The output end of the turbocharger cylinder (8) away from the cylinder slide (7) is provided with an output pipeline assembly.
2. The pulse water pressure generator according to claim 1, characterized in that: The output pipeline assembly includes a three-way element (6), a high-pressure water output pipeline and a water supply pipeline. The high-pressure water output pipeline, the water supply pipeline and the output end of the booster cylinder (8) are respectively connected to the corresponding port on the three-way element (6). The high-pressure water output pipeline is provided with a pressure-holding check valve (4) and the water supply pipeline is provided with a water supply check valve (5).
3. The pulse water pressure generator according to claim 1, characterized in that: The cylinder (3) is provided with a threaded sleeve (301) at its end, and the upper end of the plunger connecting rod (901) is inserted into the threaded sleeve (301).
4. The pulse water pressure generator according to claim 1, characterized in that: A spring pressure block (10) is provided on the lower side of the end of the cylinder (3). A sealing block (12) is provided inside the connection between the turbocharger cylinder (8) and the cylinder slide (7). The upper end of the plunger connecting rod (901) is connected to the spring pressure block (10), and the lower end passes through the sealing block (12) and extends into the turbocharger cylinder (8) and is connected to the turbocharger plunger (9). A spring (11) is fitted on the plunger connecting rod (901), and the spring (11) is located between the spring pressure block (10) and the sealing block (12).
5. The pulse water pressure generator according to claim 1, characterized in that: The crank drive device (1) includes a rotary drive device and a drive wheel, wherein the drive wheel is located on the output shaft of the rotary drive device, and one end of the crank connecting rod (101) is connected to one side of the drive wheel.