Broadband small-size passive hydraulic pulsation attenuator

Abstract

The invention relates to the technical field of hydraulic systems, and discloses a broadband small-size passive hydraulic pulsation attenuator which is characterized in that a shell is of a hollow cavity structure, and the two ends of the shell are detachably connected with end covers respectively; the thin plate support is assembled in the shell and divides the interior of the shell into a flexible lining cavity and a thin plate cavity. The flexible lining is assembled in the flexible lining cavity and used for buffering low-frequency pressure pulsation through elastic deformation. The thin plates are assembled on the thin plate support through the thin plate clamping plates respectively, the thin plate cavity is further divided into a resonant cavity and a main cavity, the main cavity is communicated with the flexible lining cavity, and a plurality of mass block sets are assembled on the thin plates to form an elastic vibration system; the damping screw is assembled on the thin plate support in a threaded mode, and a damping hole is formed in the damping screw and used for communicating the resonant cavity with the main cavity. The hydraulic pulsation attenuator does not need external energy, is compact in structure and can effectively cover a wide frequency band.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a wide-bandwidth, small-volume passive hydraulic pulsation attenuator. Background Technology

[0002] In hydraulic transmission systems, the periodic operation of components such as hydraulic pumps and relief valves generates pressure pulsations, leading to increased vibration and noise in the system pipelines, reduced component accuracy and lifespan, and even safety hazards such as pipeline rupture and seal failure. As hydraulic systems develop towards miniaturization and integration, the core requirements for pressure pulsation attenuators are "wideband coverage, small size, and passive reliability".

[0003] However, existing technologies have the following problems: Wideband coverage and small size are difficult to achieve simultaneously: traditional wideband attenuators often use a combination of multiple structures, resulting in a large size; small size designs often sacrifice the attenuation effect of high or low frequencies.

[0004] Dependence on external energy: Some broadband solutions require external power, resulting in high maintenance costs and poor reliability.

[0005] Poor adaptability: Traditional attenuators have a complex structure and are difficult to adapt to the installation space of small hydraulic systems with high pressure and low flow. Summary of the Invention

[0006] The purpose of this invention is to provide a wideband, small-volume passive hydraulic pulsation attenuator, which aims to solve or improve at least one of the above-mentioned technical problems, and is a hydraulic pulsation attenuator that does not require external energy, has a compact structure, and can effectively cover a wide frequency band.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a wideband, small-volume passive hydraulic pulsation attenuator, comprising: The outer shell has a hollow cavity structure, and end caps are detachably connected to both ends; A thin-plate bracket is assembled inside the housing, dividing the interior of the housing into a flexible lining cavity and a thin-plate cavity; A flexible liner, fitted inside the flexible liner cavity, is used to buffer low-frequency pressure pulsations through elastic deformation; A pair of thin plates are respectively assembled on the thin plate support by a pair of thin plate clamps, which further divide the thin plate cavity into a resonant cavity and a main cavity. The main cavity is connected to the flexible lining cavity. Multiple mass block groups are assembled on the thin plates to form an elastic vibration system. A damping screw is threaded onto the thin plate support and has a damping hole inside it to connect the resonant cavity and the main cavity. The flexible lining works in conjunction with the elastic vibration system and the damping holes to attenuate pressure pulsations at different frequency bands, thereby achieving wide-band pressure pulsation suppression.

[0008] Optionally, the end cap is provided with a pipe thread interface.

[0009] Optionally, sealing grooves are provided at both ends of the outer casing.

[0010] Optionally, the thin-plate support includes: A pair of discs, one of which has a plurality of first mounting holes for connection to the housing by bolts, and the other disc for abutting against the flexible lining; A pair of narrow plates are used to connect the pair of discs. The narrow plates are provided with a second mounting hole and a third mounting hole. The second mounting hole is used to connect with the damping screw, and the third mounting hole is used to connect with the thin plate clamp by bolts.

[0011] Optionally, the thin plate clamp is provided with a plurality of square grooves, which cooperate with the thin plate to form a thin plate working surface. A fourth mounting hole is provided on the thin plate at the center position corresponding to the thin plate working surface, and the fourth mounting hole is used to assemble the mass block group.

[0012] Optionally, the mass block group includes an upper mass block and a lower mass block arranged symmetrically on both sides of the thin plate.

[0013] Optionally, the flexible lining is made of rubber or silicone.

[0014] Optionally, the thin plate is made of metal.

[0015] Optionally, the diameter of the damping orifice is 0.5-4 mm.

[0016] Optionally, the flexible liner is interference-fitted with the flexible liner cavity.

[0017] The present invention discloses the following technical effects: This invention employs a combined structure of "flexible liner + thin plate - mass block + damping" to achieve full coverage suppression of wide-band pressure pulsation. The flexible liner specifically addresses low-frequency pulsation, while the thin plate-mass block-damping system resonates to cancel out higher-frequency pulsation, overcoming the limitation of traditional attenuators that can only adapt to narrow-band pulsation. Furthermore, it is specifically designed for high-pressure, low-flow conditions, effectively reducing pressure and flow pulsation in pipelines and improving adaptability to hydraulic systems under different operating conditions.

[0018] This invention utilizes a flexible liner to replace the large-volume chamber required by traditional Helmholtz resonant cavities to handle low-frequency pulsating energy. At the same time, it replaces traditional helical springs with thin plates that occupy a large amount of space. Combined with the integrated partitioning and support design of the thin plate bracket, the number of components is greatly reduced, the cavity space is compressed, and the overall size of the device is significantly reduced. With the modular assembly design, installation is convenient and it is very suitable for use in small hydraulic systems with high pressure and low flow.

[0019] This invention features a purely passive structural design, relying entirely on the elastic deformation, inertial suppression, and damping energy dissipation of its own structure to achieve pressure pulsation attenuation. It requires no additional energy drive, has high operational stability, and requires no energy consumption or complex maintenance in the later stages, thus reducing operating costs. At the same time, the internal flow channel design of the device is reasonable, and through the matching layout of the damping hole screws and the chamber, the pressure loss of the fluid in the pipeline is small, and no new pulsation is induced in the process of reducing pulsation.

[0020] The components of this invention adopt a modular and detachable assembly design. The end cap and outer shell, the thin plate pressure plate and thin plate support, and the damping hole screw and thin plate support are all detachably connected by threads or bolts. The upper mass block, lower mass block and thin plate are detachably fixed, making installation and disassembly convenient and facilitating later maintenance and replacement of each component. At the same time, by adjusting parameters such as the specifications of the mass block and the thickness of the thin plate, the pulsation attenuation effect can be optimized for hydraulic systems with different working pressures and flow rates, making it highly versatile. It should be noted that the shape of the mass block in the attached drawings is only for illustration, and its specific appearance can be flexibly designed according to the installation space and processing technology, and is not limited to the style shown in the drawings.

[0021] The thin-plate bracket of this invention has the dual functions of cavity partitioning and thin-plate support. The damping hole screws are directly integrated into the bracket to realize the cavity connection, which simplifies the overall structural layout, makes the device structure more compact, and improves assembly efficiency. The integrated design simplifies redundant pressure-bearing parts, which not only reduces the impact of assembly errors on pressure-bearing performance, but also further ensures the overall structural strength and long-term operational stability of the device under high-pressure conditions. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an overall assembly drawing of the present invention; Figure 2 This is a three-dimensional main sectional view of the present invention; Figure 3 This is a two-dimensional cross-sectional view of the present invention; Figure 4 This is a structural diagram of the thin plate and thin plate clamping plate of the present invention; Figure 5 This is a structural diagram of the thin plate support of the present invention.

[0023] In the diagram: 1. End cap; 2. Flexible liner; 3. Outer shell; 4. Thin plate support; 5. Upper mass block; 6. Lower mass block; 7. Damping screw; 8. Thin plate; 9. Thin plate clamping plate; 10. Resonant cavity; 11. Main cavity; 12. Flexible liner cavity; 13. Pipe thread interface; 14. Damping hole; 15. Sealing groove; 16. Thin plate working surface; 17. Fourth mounting hole; 18. First mounting hole; 19. Second mounting hole; 20. Third mounting hole. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 5 This invention provides a wideband, small-volume passive hydraulic pulsation attenuator, comprising: The outer shell 3 is a hollow cavity structure, and end caps 1 are detachably connected to both ends of it; The thin plate bracket 4 is assembled inside the outer shell 3, dividing the interior of the outer shell 3 into a flexible lining cavity 12 and a thin plate cavity; The flexible liner 2 is assembled inside the flexible liner cavity 12 and is used to buffer low-frequency pressure pulsations through elastic deformation. A pair of thin plates 8 are respectively assembled on a thin plate support 4 via a pair of thin plate clamps 9, further dividing the thin plate cavity into a resonant cavity 10 and a main cavity 11. The main cavity 11 is connected to the flexible lining cavity 12. Multiple mass blocks are assembled on the thin plate 8 to form an elastic vibration system. The damping screw 7 is threaded onto the thin plate support 4. It has a damping hole 14 inside to connect the resonant cavity 10 and the main cavity 11. The axis of the damping hole 14 is consistent with the connection direction of the resonant cavity 10 and the main cavity 11. Among them, the flexible liner 2 works in conjunction with the elastic vibration system and the damping hole 14 to attenuate pressure pulsations in different frequency bands, thereby achieving wide-band pressure pulsation suppression.

[0027] The thin plate bracket 4 is used to realize the partitioned layout of the three cavities of the outer shell. The flexible lining 2 built into the flexible lining cavity 12 is used to buffer low-frequency pressure pulsation. The thin plate 8 replaces the traditional spring and mass block to form an elastic vibration system. The resonant cavity 10 connected by the damping screw 7 and the main cavity 11 realize the energy dissipation and resonance cancellation of higher frequency pulsation. This not only effectively suppresses the pressure pulsation of the wide frequency band, but also greatly reduces the overall size of the device by compressing the cavity volume through the flexible lining 2 and simplifying the structure by replacing the spring with the thin plate 8. At the same time, the modular assembly design improves the convenience of installation, reduces the pressure loss of pipeline fluid, and is suitable for the use of high-pressure, low-flow small hydraulic systems.

[0028] In one embodiment of the present invention, the end cap 1 is provided with a pipe thread interface 13.

[0029] The pipe thread interface 13 is compatible with the oil inlet and outlet pipes of the hydraulic system, which facilitates the series connection and installation of the device with the hydraulic system and ensures the stable flow of hydraulic oil. The standard pipe thread design allows for quick connection with existing hydraulic pipelines without the need for additional adapters, reducing system modification costs. The interface is directly opened on the end cover 1, avoiding the complex layout of external pipelines and further reducing the installation space requirements.

[0030] In one embodiment of the present invention, sealing grooves 15 are respectively provided at both ends of the outer shell 3.

[0031] A sealing ring is fitted inside the sealing groove 15, which works with the end cover 1 to achieve overall sealing protection of the device, effectively preventing high-pressure hydraulic oil leakage and ensuring the safe operation of the device under high-pressure conditions. The positioning design of the sealing groove 15 ensures the coaxiality of the end cover 1 and the outer shell 3, reducing the impact of assembly errors on pressure-bearing performance and ensuring the overall structural strength and long-term operational stability of the device under high-pressure conditions. The detachable sealing structure facilitates the replacement of seals in the future, extending the service life of the device.

[0032] In one embodiment of the present invention, the thin plate support 4 includes: A pair of discs, one of which has multiple first mounting holes 18 for connecting to the housing 3 by bolts, and the other disc for abutting against the flexible lining 2; A pair of narrow plates are used to connect a pair of discs. The narrow plates have a second mounting hole 19 and a third mounting hole 20. The second mounting hole 19 is used to connect with a damping screw 7, and the third mounting hole 20 is used to connect with a thin plate clamp 9 by bolts.

[0033] The thin plate support 4 has the dual functions of cavity partitioning and support. The integrated design simplifies redundant pressure-bearing parts, making the device structure more compact and the assembly efficiency higher. One disc cooperates with the end cover 1 to form a flexible lining cavity 12, and the other disc is fixed to the outer shell 3 by bolts to achieve axial precision positioning of the thin plate support 4 and ensure clear separation of each chamber. The first mounting hole 18 is used for bolt connection with the outer shell 3, the second mounting hole 19 is used for mounting the damping screw 7, and the third mounting hole 20 is used for mounting the thin plate clamp 9. The layout of each functional hole is reasonable, which facilitates modular assembly and subsequent disassembly and maintenance.

[0034] Furthermore, one end of the outer shell 3 is provided with a stepped boss, and through holes are evenly distributed on the boss for positioning and installation of the thin plate bracket 4. The disc with the first mounting hole 18 on the thin plate bracket 4 is fastened to the stepped boss of the outer shell 3 by bolts passing through the through holes, so as to achieve precise axial positioning.

[0035] In one embodiment of the present invention, a plurality of square grooves are provided on the thin plate clamping plate 9, and the square grooves cooperate with the thin plate 8 to form a thin plate working surface 16. A fourth mounting hole 17 is provided on the thin plate 8 at the center position corresponding to the thin plate working surface 16. The fourth mounting hole 17 is used to assemble the mass block group.

[0036] The square groove and the thin plate 8 cooperate to form the working surface 16 of the thin plate, so that the area in the middle of the thin plate 8 that is not compressed forms an effective elastic vibration area, ensuring the stability and predictability of the vibration of the thin plate 8; the fourth mounting hole 17 is located at the center of the working surface 16 of the thin plate, ensuring that the mass block assembly is assembled in the optimal position of the vibration system, improving the inertia suppression effect; by replacing the thin plate clamping plate 9 of different specifications or adjusting the size of the working surface 16 of the thin plate, different specifications of thin plates 8 and mass blocks can be adapted, and the natural frequency of the system can be flexibly adjusted.

[0037] In one embodiment of the present invention, the mass block group includes an upper mass block 5 and a lower mass block 6 arranged symmetrically on both sides of the thin plate 8.

[0038] The upper mass block 5 and the lower mass block 6 are symmetrically arranged on both sides of the thin plate 8 to make the mass distribution of the vibration system uniform and avoid vibration instability or thin plate deformation caused by eccentric loading. The reverse inertial force generated by inertia effectively prevents the thin plate 8 from vibrating significantly under high-frequency pulsation and initially absorbs pulsation energy. The specifications (mass and size) of the upper and lower mass blocks can be adjusted according to different working pressure and pulsation frequency requirements to flexibly adapt to the attenuation requirements of different hydraulic systems.

[0039] In one embodiment of the invention, the flexible lining is made of rubber or silicone.

[0040] Rubber or silicone materials have excellent elastic deformation characteristics, which can efficiently convert low-frequency pulsating pressure energy into its own elastic potential energy, thus effectively buffering and weakening low-frequency pulsation; using high-pressure resistant silicone rubber material, it can withstand the high-pressure environment of the hydraulic system, ensuring long-term reliability; the outer peripheral surface of the flexible lining 2 is tightly fitted to the inner wall of the flexible lining cavity 12, which not only plays a sealing role, but also absorbs vibration through elastic deformation, thus achieving functional integration.

[0041] In one embodiment of the present invention, the thin plate 8 is made of metal.

[0042] The thin metal plate has suitable elastic modulus and stiffness. When the thickness is 0.1-2mm, it can generate a rapid elastic response to high-frequency pressure pulsation, forming effective vibration suppression. The metal material has good fatigue strength and durability, and is not easy to fail under long-term alternating stress, ensuring the service life of the attenuator. The thin metal plate works together with the mass block and damping hole 14 to form an efficient spring-mass-damped vibration system, which enhances the inertial suppression effect on high-frequency pressure pulsation.

[0043] In one embodiment of the present invention, the diameter of the damping orifice 14 is 0.5-4 mm.

[0044] To further ensure the structural integrity and vibration stability of the thin plate 8 under high-frequency vibration environment, and to prevent the thin plate 8 from undergoing excessive deformation or damage near the resonant frequency.

[0045] In one embodiment of the present invention, the flexible liner 2 is interference-fitted with the flexible liner cavity 12.

[0046] The length of the flexible liner 2 is slightly greater than the depth of the flexible liner cavity 12. After assembly, a slight interference fit is formed to meet the installation and fixing requirements and prevent the flexible liner 2 from shifting or loosening under high pressure pulsation. The interference fit makes the outer peripheral surface of the flexible liner 2 fit tightly against the inner wall of the cavity, eliminating gaps and preventing hydraulic oil from leaking between the flexible liner 2 and the cavity wall. Although an interference fit is used, the flexible liner 2 can still be disassembled and replaced later by reasonably designing the interference amount, taking into account both the installation firmness and the convenience of maintenance.

[0047] Working Principle: This invention achieves wide-band pressure pulsation suppression through the synergistic effect of a dual mechanism: "low-frequency buffering of flexible lining 2 + high-frequency energy dissipation cancellation of thin plate 8-mass block-damping." Specifically, after pressure pulsations in the hydraulic system are transmitted to the main cavity 11 through the oil inlet pipe, an adaptive attenuation mechanism is simultaneously activated for pulsations of different frequency bands. Low-frequency pulsation energy is transferred to the flexible lining 2 of the flexible lining cavity 12. The elastic deformation characteristics of the flexible lining 2 convert the low-frequency pulsation pressure energy into its own elastic potential energy, thus achieving buffering and weakening of the low-frequency pulsations. High-frequency pulsations directly drive the thin plate 8 to generate elastic vibration. The upper mass block 5 and lower mass block 6, which are fixed to the thin plate 8, generate a reverse inertial force due to inertia, which hinders the high-frequency large-amplitude vibration of the thin plate 8 to initially absorb the pulsation energy. At the same time, the main cavity 11 and the resonant cavity 10 are connected through the damping hole 14. The high-frequency pulsations drive the hydraulic oil to flow between the two cavities through the damping hole 14, generating a throttling damping effect that converts some of the pulsation energy into heat energy dissipation. The multiple effects of the above high-frequency attenuation and the low-frequency buffering mechanism work together to ultimately achieve effective attenuation of wide-band pressure pulsations.

[0048] The pulsation attenuator of this invention is a passive structure. It achieves wide-band pulsation attenuation through a flexible liner 2 combined with a thin plate 8-mass block system. The design significantly reduces volume by replacing a large chamber with a flexible liner and a traditional spring with a thin plate, resulting in a compact structure suitable for hydraulic systems with limited space. Furthermore, the parameters of the mass block and thin plate can be adjusted to meet different pulsation frequency requirements, ensuring stable and reliable attenuation. The internal flow channel design of this invention is smooth, minimizing pressure loss on the fluid during pulsation attenuation and preventing the induction of new pulsations, thus ensuring stable operation of the hydraulic system.

[0049] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A broadband, small volume, passive hydraulic pulsation damper, characterized by, The utility model relates to a wide-band pressure pulsation damping device, comprising: a shell (3) which is a hollow cavity structure, two ends of which are detachably connected with end covers (1); a thin plate support (4) which is assembled in the shell (3) and divides the shell (3) into a flexible lining cavity (12) and a thin plate cavity; a flexible lining (2) which is assembled in the flexible lining cavity (12) and is used for buffering low-frequency pressure pulsation through elastic deformation; a pair of thin plates (8) which are assembled on the thin plate support (4) through a pair of thin plate clamps (9) and further divide the thin plate cavity into a resonance cavity (10) and a main cavity (11), the main cavity (11) is connected with the flexible lining cavity (12), and a plurality of mass block groups are assembled on the thin plate (8) to form an elastic vibration system; a damping screw (7) which is screw-assembled on the thin plate support (4) and has a damping hole (14) in the inside for connecting the resonance cavity (10) with the main cavity (11); wherein the flexible lining (2) cooperates with the elastic vibration system and the damping hole (14) to attenuate different frequency band pressure pulsation respectively, thereby realizing wide-band pressure pulsation damping.

2. A broadband small volume passive hydraulic pulsation damper according to claim 1, characterized in that A pipe threaded interface (13) is formed in the end cover (1).

3. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, Sealing grooves (15) are formed in two ends of the shell (3).

4. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The thin plate support (4) comprises: a pair of discs, one of which has a plurality of first mounting holes (18) for being connected with the shell (3) through bolts, and the other of which is used for abutting against the flexible lining (2); a pair of narrow plates which are used for connecting the pair of discs, have second mounting holes (19) and third mounting holes (20), the second mounting holes (19) are used for being connected with the damping screw (7), and the third mounting holes (20) are used for being connected with the thin plate clamps (9) through bolts.

5. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, A plurality of square grooves are formed in the thin plate clamps (9), the square grooves and the thin plates (8) form thin plate working surfaces (16), fourth mounting holes (17) are formed in the thin plates (8) at positions corresponding to centers of the thin plate working surfaces (16), and the fourth mounting holes (17) are used for assembling the mass block groups.

6. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The mass block groups comprise upper mass blocks (5) and lower mass blocks (6) which are symmetrically arranged and located on two sides of the thin plates (8).

7. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The flexible lining (2) is made of rubber or silicone.

8. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The thin plates (8) are made of metal.

9. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The damping hole (14) has a diameter of 0.5-4 mm.

10. A broadband small volume passive hydraulic pulsation damper according to claim 1, wherein, The flexible lining (2) is in interference fit with the flexible lining cavity (12).

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