A filling line damping device
By introducing a pressure buffer system consisting of a buffer cylinder, piston body, and accumulator into the filling pump, the problem of pipeline pressure pulses caused by pump reversal is solved, achieving pipeline stability and adaptability, reducing vibration and noise, and improving equipment service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN YUTAI HEAVY IND CO LTD
- Filing Date
- 2025-10-04
- Publication Date
- 2026-07-24
AI Technical Summary
The pipeline pressure pulses caused by the filling pump during the reversal process affect the stability of the delivery and the life of the equipment, making it difficult to adapt to the needs of multiple working conditions.
A filling pipeline vibration damping device is adopted, including a buffer cylinder, piston body, plunger, oil replenishment plug and accumulator, which are connected by flanges to form a pressure buffer system. The piston stroke is adjusted by pre-charging the accumulator and hydraulic oil, and multiple sets of accumulators are connected in parallel to achieve buffering and stabilization of pressure fluctuations.
It effectively reduces pipeline vibration and noise, improves equipment applicability and lifespan, ensures pipeline pressure stability and adaptability, and provides real-time monitoring methods to facilitate equipment maintenance.
Smart Images
Figure CN224551090U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a shock absorption device, specifically a shock absorption device for a filling pipeline. Background Technology
[0002] The main conveying equipment in the tailings backfilling industry is the backfilling industrial pump. Currently, there are two types of backfilling industrial pumps on the market: one is the S-swivel valve backfilling industrial pump, and the other is the lifting cone valve backfilling industrial pump. Regardless of the structure of the backfilling industrial pump, there is always a switching process between the swivel valve (which can be understood as a switching valve) or the lifting valve (which can also be understood as a switching valve). That is to say, the S-swivel valve needs to switch back and forth when it is working, and the lifting cone valve needs to switch up and down when it is working.
[0003] Currently, the S-shaped valve filling pumps used in mines employ two separate left and right plunger-type conveying cylinders that work alternately. Slurry is drawn into the hopper by the conveying cylinders and pushed out by the pistons under pressure. During operation, the left and right conveying cylinders work alternately and simultaneously change direction. That is, when the piston of the left conveying cylinder is pushed to the front, the piston of the right conveying cylinder is just pushed to the back, and the direction of movement changes simultaneously. The piston that was originally pushing forward becomes retracting, and the piston that was originally retracting becomes pushing forward. At the instant the pistons of the two conveying cylinders simultaneously change direction, the pressure of the slurry in the conveying pipeline becomes 0, causing a sudden change in the fluid direction of the slurry in the filling pipeline. The slurry in the pipeline exhibits pulse-like changes throughout the operation of the filling pump, resulting in large pipeline vibration, high noise, and easy loosening of pipeline supports. Utility Model Content
[0004] The purpose of this utility model is to provide a shock absorption device for filling pipelines, which solves the technical problem that pressure pulses in the pipeline caused by filling pump reversal, etc., impact the pipeline, affect the stability of transportation and the life of equipment, and are difficult to adapt to multiple working conditions.
[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A filling pipeline shock absorption device, which buffers and reduces pressure fluctuations when the filling pipeline transports the medium, includes a filling pipeline, a buffer cylinder, a piston body, a plunger, an oil filler plug, and an accumulator; the filling pipeline and the buffer cylinder are fixedly connected by a flange, the piston body and the plunger are installed inside the buffer cylinder, the buffer cylinder is provided with an oil filler plug, and the buffer cylinder and the accumulator are fixedly connected by a flange.
[0006] As a preferred embodiment of the filling pipeline vibration damping device, it also includes an accumulator pressure gauge and a filling pipeline pressure gauge, wherein the accumulator pressure gauge is installed on the top of the accumulator and the filling pipeline pressure gauge is installed on the filling pipeline.
[0007] As a preferred embodiment of the vibration damping device for the filling pipeline, the piston body is made of polyurethane, and the lip size of the piston body is 6-7mm larger than the inner diameter of the buffer cylinder. In the working state, the piston body is in direct contact with the slurry in the filling pipeline.
[0008] As a preferred embodiment of the vibration damping device for the filling pipeline, the plunger is made of metal. In the working state, the plunger is in contact with hydraulic oil and does not come into contact with the slurry in the filling pipeline.
[0009] As a preferred embodiment of the filling pipeline vibration damping device, the plunger is provided with a sealing groove, and a dustproof ring, a first U-shaped seal, a second U-shaped seal, a first guide ring, a first piston seal, a pull rod seal, a second piston seal, and a second guide ring are installed in the sealing groove from bottom to top; the lip of the first U-shaped seal is set downwards, the lip of the second U-shaped seal is set upwards, and the pull rod seal is located between the first piston seal and the second piston seal.
[0010] As a preferred embodiment of the filling pipeline vibration damping device, the pre-charge pressure of the accumulator is 1 / 3 of the maximum pressure of the pipeline and does not exceed 6MPa, and the upper cavity of the buffer cylinder is pre-filled with hydraulic oil.
[0011] As a preferred solution for the filling pipeline vibration damping device, the working stroke of the piston body is adjusted by adjusting the amount of hydraulic oil injected into the upper cavity of the buffer cylinder to adapt to the working conditions of filling slurry with different flow rates.
[0012] As a preferred solution for the vibration damping device of the filling pipeline, multiple sets of the aforementioned accumulators are connected in parallel.
[0013] The beneficial effects of this utility model are as follows: First, the matching piston body and plunger physically isolate the filling slurry in the pipeline from the accumulator bladder, avoiding direct contact and wear of the slurry on the bladder, thereby effectively improving the service life of the accumulator bladder.
[0014] Secondly, by pre-charging the accumulator and pre-filling the upper cavity of the buffer cylinder with oil, the appropriate pre-charging and oil filling pressures can be matched according to different pipeline delivery pressures, which can flexibly adapt to various working conditions.
[0015] Third, for large-volume, high-pressure applications, multiple accumulators can be connected in parallel to enhance the applicability of the device under different scales and pressure conditions.
[0016] Fourth, the plunger is equipped with sealing components such as dustproof rings, guide rings, piston seals, and tie rod seals, which can effectively ensure the airtightness of the hydraulic oil in the upper cavity of the buffer cylinder and ensure the normal and stable operation of the device.
[0017] Fifth, pressure gauges are installed in both the accumulator and the filling pipeline to monitor pressure fluctuations in the filling pipeline in real time. This allows for timely understanding of the device's operating status and pipeline pressure changes, providing a basis for equipment maintenance and adjustment.
[0018] Sixth, by adjusting the amount of hydraulic oil injected into the upper cavity of the buffer cylinder, the working stroke of the piston can be adjusted to meet the working conditions of different flow rates of filling slurry, thus improving the versatility of the device. Attached Figure Description
[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.
[0021] Figure 1 is a schematic diagram of the filling pipeline vibration damping device proposed in this utility model at the moment of normal operation.
[0022] Figure 2 is a schematic diagram of the normal reversal moment of the filling pipeline vibration damping device proposed in this utility model.
[0023] In the diagram, 1. Filling pipeline; 2. Buffer cylinder; 3. Piston body; 4. Plunger; 5. Oil filler plug; 6. Accumulator; 7. Accumulator pressure gauge; 8. Filling pipeline pressure gauge; 9. Dust seal; 10. First U-shaped seal; 11. First guide ring; 12. First piston seal; 13. Pull rod seal; 14. Second guide ring; 15. Second U-shaped seal; 16. Second piston seal. Detailed Implementation
[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0026] Referring to Figures 1 and 2, this embodiment of the present invention provides a shock-absorbing device for a filling pipeline 1, which buffers and reduces pressure fluctuations when the filling pipeline 1 transports the medium. The device includes a filling pipeline 1, a buffer cylinder 2, a piston body 3, a plunger 4, a filler plug 5, and an accumulator 6. The filling pipeline 1 and the buffer cylinder 2 are fixedly connected by a flange. The piston body 3 and the plunger 4 are installed inside the buffer cylinder 2. The buffer cylinder 2 has a filler port sealed by the filler plug 5. The buffer cylinder 2 and the accumulator 6 are fixedly connected by a flange.
[0027] Specifically, the device constructs a rigid structural system through flange connections, forming a pressure buffer system that connects the filling pipeline 1, the buffer cylinder 2, and the accumulator 6. When the filling pump delivers slurry, the slurry pressure is transmitted to the buffer cylinder 2 through the filling pipeline 1. The oil filler port, sealed by the oil filler plug 5, is used to inject hydraulic oil into the upper cavity of the buffer cylinder 2 in the initial state, ensuring the hydraulic medium reserve before system operation. The piston body 3 and the plunger 4 form a movable pressure transmission assembly within the buffer cylinder 2, providing a mechanical carrier for the subsequent pressure buffering process.
[0028] In this embodiment, an accumulator pressure gauge 7 and a filling pipeline pressure gauge 8 are also included. The accumulator pressure gauge 7 is installed on the top of the accumulator 6, and the filling pipeline pressure gauge 8 is installed on the filling pipeline 1.
[0029] Specifically, the accumulator pressure gauge 7 and the filling pipeline pressure gauge 8 monitor the internal pressure of the accumulator 6 and the pressure of the filling pipeline 1 in real time, respectively. When the pressure of the filling pipeline 1 fluctuates due to pump reversal, the accumulator pressure gauge 7 can display the internal pressure change, making it easier for operators to judge the pressure replenishment status of the accumulator 6; the filling pipeline pressure gauge 8 directly reports the slurry pressure fluctuation. By comparing the values of the two gauges, the system's buffering effect can be intuitively understood, providing data basis for adjusting the pre-charge pressure or hydraulic oil injection volume.
[0030] In this embodiment, the piston body 3 is made of polyurethane, and the lip size of the piston body 3 is 6-7mm larger than the inner diameter of the buffer cylinder 2. In the working state, the piston body 3 is in direct contact with the slurry in the filling pipeline 1.
[0031] Specifically, the polyurethane material possesses high elasticity and wear resistance, enabling it to withstand repeated extrusion during slurry flow. The design, with a lip size larger than the cylinder's inner diameter, creates an interference fit, ensuring a tight seal between the piston body 3 and the inner wall of the buffer cylinder 2, preventing slurry leakage. When the slurry pressure pushes the piston body 3 upwards, its lip presses tightly against the cylinder's inner wall, synchronously transmitting the slurry pressure to the plunger 4, which in turn pushes hydraulic oil into the accumulator 6, achieving the first step of pressure buffering.
[0032] In this embodiment, the plunger 4 is made of metal. In the working state, the plunger 4 is in contact with hydraulic oil, but in the working state, the plunger 4 is not in contact with the slurry in the filling pipeline 1.
[0033] Specifically, the metal plunger 4 possesses high strength, capable of withstanding the thrust of hydraulic oil and the reaction force of the accumulator 6. The design of isolating the plunger 4 from the slurry prevents wear on the plunger 4 surface caused by particulate impurities in the slurry, while also preventing slurry contamination of the hydraulic oil, ensuring the purity of the hydraulic system. When the plunger 4 moves under the propulsion of hydraulic oil, its precise displacement directly affects the filling / discharging volume of the accumulator 6, thereby controlling the accuracy of pressure buffering.
[0034] In this embodiment, the plunger 4 is provided with a sealing groove, and a dustproof ring 9, a first U-shaped seal 10, a second U-shaped seal 15, a first guide ring 11, a first piston seal 12, a pull rod seal 13, a second piston seal 16, and a second guide ring 14 are installed in the sealing groove from bottom to top. The lip of the first U-shaped seal 10 is set downwards, the lip of the second U-shaped seal 15 is set upwards, and the pull rod seal 13 is located between the first piston seal 12 and the second piston seal 16.
[0035] Specifically, the multi-layered seals within the sealing groove form a composite sealing structure: the dustproof ring 9 blocks external dust from entering, protecting the internal seals; the first U-shaped seal 10 and the second U-shaped seal 15 have opposite lip directions (facing downwards and upwards) to cope with the downward and upward pressure of hydraulic oil, respectively, achieving dynamic sealing through elastic deformation of the lips; the first guide ring 11 and the second guide ring 14 support the plunger 4, preventing it from deflecting during movement and ensuring uniform force on the seals; the first piston seal 12 and the second piston seal 16 block the hydraulic oil leakage path, maintaining the pressure stability of the upper cavity of the buffer cylinder 2; the pull rod seal 13 forms a secondary seal between the first piston seal 12 and the second piston seal 16, further improving the system's tightness.
[0036] This ensures that the hydraulic oil circulates only between the buffer cylinder 2 and the accumulator 6, avoiding pressure buffer failure caused by leakage.
[0037] In this embodiment, the pre-charge pressure of the accumulator 6 is 1 / 3 of the maximum pressure of the pipeline and does not exceed 6MPa, and the upper cavity of the buffer cylinder 2 is pre-filled with hydraulic oil.
[0038] Specifically, the pre-charge pressure of accumulator 6 is set to 1 / 3 of the maximum pipeline pressure to create a reasonable pressure difference when the slurry pressure fluctuates. When the slurry pressure is higher than the pre-charge pressure, accumulator 6 absorbs the excess pressure (hydraulic oil is pushed into accumulator 6, and the bladder is compressed); when the slurry pressure drops sharply, the compressed gas in accumulator 6 pushes the hydraulic oil back to replenish the pipeline pressure. The upper cavity of the buffer cylinder 2 is pre-filled with hydraulic oil to provide a medium for the movement of plunger 4, ensuring the continuity of pressure transmission and avoiding a decrease in buffering efficiency due to gas mixing.
[0039] In this embodiment, the working stroke of the piston body 3 is adjusted by adjusting the amount of hydraulic oil injected into the upper cavity of the buffer cylinder 2 to adapt to different flow rates of filling slurry.
[0040] Specifically, the amount of hydraulic oil injected determines the initial volume of the upper cavity of the buffer cylinder 2. A higher oil volume results in a lower initial position for the piston 3, a greater upward stroke, and the ability to absorb larger fluctuations in slurry pressure, making it suitable for high-flow-rate conditions. Conversely, a lower oil volume results in a shorter stroke, suitable for low-flow-rate conditions. This adjustment method allows the device to flexibly adjust its buffering capacity according to actual filling requirements, avoiding situations where the system is oversized or undersized, thus improving system adaptability.
[0041] In one possible embodiment, multiple sets of the accumulators 6 are connected in parallel. When facing large-volume, high-pressure filling conditions, the buffering capacity of a single set of accumulators 6 may be insufficient. After multiple sets of accumulators 6 are connected in parallel, the total volume increases, and the amount of hydraulic oil that can be absorbed or released increases, thereby improving the system's buffering capacity against pressure fluctuations in high-pressure, high-flow-rate slurry.
[0042] In parallel operation, each accumulator 6 works synchronously, and the pressure is evenly distributed, avoiding overload of a single accumulator 6 and ensuring that the pipeline pressure can still be effectively maintained under extreme conditions.
[0043] The working principle of this utility model is as follows: the accumulator 6 is pre-charged at 1 / 3 of the maximum pressure of the pipeline (usually not exceeding 6MPa), and the upper cavity of the buffer cylinder 2 is pre-filled with hydraulic oil to establish the initial working conditions for the subsequent pressure buffering process.
[0044] Normal filling stage: When the filling slurry is pressurized by the filling industrial pump and flows along the filling pipeline 1, if the slurry pressure is higher than the pre-filling pressure of the accumulator 6, the slurry will enter the interior of the buffer cylinder 2 through the connection interface (such as port A) between the buffer cylinder 2 and the filling pipeline 1. At this time, the slurry pressure acts directly on the bottom of the piston body 3. Since the lip size of the piston body 3 is 6-7mm larger than the inner diameter of the buffer cylinder 2, an interference seal is formed, and the slurry pushes the piston body 3 to move upward.
[0045] As the piston 3 moves upward, it drives the piston 4, which is rigidly connected to it, to move upward simultaneously. The piston 4 moves in the hydraulic oil in the upper cavity of the buffer cylinder 2, pushing the hydraulic oil into the accumulator 6 through the flange connection channel between the buffer cylinder 2 and the accumulator 6. As the hydraulic oil is injected, the internal pressure of the accumulator 6 gradually increases, and its internal bladder is compressed until the pressure inside the accumulator 6 reaches equilibrium with the slurry pressure in the filling pipeline 1.
[0046] During this process, the accumulator 6 stores pressure energy through bladder compression, which is equivalent to absorbing excess pressure fluctuation energy in the filling pipeline 1, thus preventing the pipeline from being impacted by a sudden increase in slurry pressure. At this time, the system is in an "energy storage state," preparing for pressure compensation during subsequent reversal.
[0047] At the moment of pump reversal: When the plunger cylinder 4 of the filling pump reverses direction, the pump loses its ability to pressurize the slurry in the pipeline, and the slurry pressure in filling pipeline 1 will drop sharply. At this time, the internal pressure of the accumulator 6, which previously stored pressure energy, is higher than the slurry pressure in filling pipeline 1, creating a pressure difference. The compressed bladder in the accumulator 6 rebounds due to the pressure difference, squeezing the hydraulic oil outside the bladder. The hydraulic oil flows back through the original channel to the upper cavity of the buffer cylinder 2, pushing the plunger 4 downward. As the plunger 4 moves downward, it drives the piston 3 downward synchronously, and the piston 3 pushes the slurry below it back into filling pipeline 1. This process is equivalent to the accumulator 6 "replenishing pressure" to filling pipeline 1, compensating for the momentary pressure loss in the pipeline caused by pump reversal, preventing a significant drop in slurry pressure in the pipeline. In this way, the problem of sudden pressure drop caused by reversal in traditional filling systems is effectively alleviated.
[0048] Throughout the filling operation, the above process continuously cycles: when the slurry pressure in the pipeline increases, the accumulator 6 absorbs energy; when the pipeline pressure decreases, the accumulator 6 releases energy. Through this "charging-releasing" cycle, the slurry pressure within the filling pipeline 1 is maintained at a relatively stable state, avoiding the pulsed pressure fluctuations caused by pump reversal in traditional systems. Because the slurry pressure within the pipeline no longer exhibits drastic pulsed changes but remains relatively stable, the vibration amplitude of the pipeline is significantly reduced, and the accompanying noise is also significantly reduced. This effect directly solves the problems of large pipeline vibration, high noise, and easy loosening of supports caused by pressure fluctuations in existing technologies.
[0049] By changing the amount of hydraulic oil injected into the upper cavity of the buffer cylinder 2, the initial position of the piston 3 can be adjusted, thereby changing its working stroke. A larger injection volume results in a lower initial position for the piston 3 and a greater upward stroke, suitable for high-flow-rate slurry conditions; a smaller injection volume results in a shorter stroke, suitable for low-flow-rate conditions, achieving flexible adaptation to different flow conditions. For large-volume, high-pressure filling conditions, multiple accumulators 6 can be connected in parallel. Parallel connection increases the total volume, allowing for the absorption or release of more hydraulic oil, improving the system's buffering capacity for high-pressure, high-flow-rate slurry, and ensuring effective maintenance of pipeline pressure stability even under extreme conditions.
[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A vibration damping device for a filling pipeline, characterized in that, The pressure fluctuations during medium transport in the filling pipeline are buffered and damped, including the filling pipeline (1), buffer cylinder (2), piston body (3), plunger (4), oil filler plug (5), and accumulator (6); the filling pipeline (1) and the buffer cylinder (2) are fixedly connected by a flange, the piston body (3) and the plunger (4) are installed inside the buffer cylinder (2), the buffer cylinder (2) is provided with an oil filler plug (5) and the buffer cylinder (2) is fixedly connected by a flange.
2. The vibration damping device for a filling pipeline according to claim 1, characterized in that, It also includes an accumulator pressure gauge (7) and a filling line pressure gauge (8), wherein the accumulator pressure gauge (7) is installed on the top of the accumulator (6) and the filling line pressure gauge (8) is installed on the filling line (1).
3. The vibration damping device for a filling pipeline according to claim 1, characterized in that, The piston body (3) is made of polyurethane. The lip size of the piston body (3) is 6-7 mm larger than the inner diameter of the buffer cylinder (2). In the working state, the piston body (3) is in direct contact with the slurry in the filling pipeline (1).
4. The vibration damping device for a filling pipeline according to claim 1, characterized in that, The plunger (4) is made of metal. In the working state, the plunger (4) is in contact with hydraulic oil and does not contact the slurry in the filling pipeline (1).
5. A vibration damping device for a filling pipeline according to claim 4, characterized in that, The plunger (4) is provided with a sealing groove, and a dustproof ring (9), a first U-shaped seal (10), a second U-shaped seal (15), a first guide ring (11), a first piston seal (12), a pull rod seal (13), a second piston seal (16), and a second guide ring (14) are installed in the sealing groove from bottom to top. The lip of the first U-shaped seal (10) is set downwards, the lip of the second U-shaped seal (15) is set upwards, and the pull rod seal (13) is located between the first piston seal (12) and the second piston seal (16).
6. The vibration damping device for a filling pipeline according to claim 1, characterized in that, The pre-charge pressure of the accumulator (6) is 1 / 3 of the maximum pressure of the pipeline and does not exceed 6MPa. The upper cavity of the buffer cylinder (2) is pre-filled with hydraulic oil.
7. A vibration damping device for a filling pipeline according to claim 1, characterized in that, The working stroke of the piston (3) is adjusted by adjusting the amount of hydraulic oil injected into the upper cavity of the buffer cylinder (2) to adapt to different flow rates of filling slurry.
8. A vibration damping device for a filling pipeline according to any one of claims 1-7, characterized in that, Multiple sets of the aforementioned accumulators (6) are connected in parallel.