CN110594336B - Pressure pulsation attenuator with adjustable electroless driving frequency - Google Patents
Pressure pulsation attenuator with adjustable electroless driving frequency Download PDFInfo
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- CN110594336B CN110594336B CN201910972673.6A CN201910972673A CN110594336B CN 110594336 B CN110594336 B CN 110594336B CN 201910972673 A CN201910972673 A CN 201910972673A CN 110594336 B CN110594336 B CN 110594336B
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- 230000010349 pulsation Effects 0.000 title claims abstract description 35
- 238000003306 harvesting Methods 0.000 claims abstract description 38
- 238000013016 damping Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 239000007788 liquid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 241000380131 Ammophila arenaria Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnets (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a non-electric driving frequency adjustable pressure pulsation attenuator which comprises a proportion electromagnet, a frequency adjusting end cover, a Helmholtz Huo Cirong cavity, a shell, a frequency adjusting damper, a piezoelectric energy harvesting component, a frequency control unit, a capacitor, an energy harvesting control unit and the like. The two sides of the shell are provided with an inlet and an outlet, and the middle is provided with a main channel; a Helmholtz damping hole is formed above the main channel, can be regulated by a frequency regulating damper and is connected with the Helmholtz cavity; the lower part of the main channel is connected with a piezoelectric energy harvesting inlet and a piezoelectric energy harvesting assembly, and generated electric energy is connected to the frequency control unit through a wire and stored in the capacitor, so that power is supplied to the proportion electromagnet through the energy harvesting control unit. The invention recovers the pressure pulsation into electric energy for driving the proportional electromagnet, and further adjusts the diameter of the Helmholtz damping hole to seek the maximum attenuation of the pressure pulsation, and can be applied to the driving of low-power consumption elements in the occasions of underwater vehicles, aerospace and the like.
Description
Technical Field
The invention relates to a pressure pulsation attenuator, in particular to a non-electric driving frequency adjustable pressure pulsation attenuator.
Background
Flow pulsation is an inherent property of a hydraulic pump and generates pressure pulsation when fluid encounters a load such as a valve port, an elbow, etc. The pressure pulsation can cause pipeline vibration on the one hand, and on the other hand can arouse the pipeline to produce fluid noise, seriously influences hydraulic system's operating quality and life. The helmholtz attenuator is a common resonance type pressure pulsation attenuator with strong frequency selectivity, good attenuation effect for medium-high frequency pressure pulsation above 300Hz, and optimal attenuation effect for a certain fixed frequency, and the pressure pulsation in the actual hydraulic system pipeline shows broadband characteristics, namely, low frequency, medium frequency and high frequency exist simultaneously, so that the design of the broadband pressure pulsation attenuator is needed.
The pulsation damping frequency of the helmholtz attenuator can be adjusted by changing the diameter of the damping hole of the helmholtz attenuator, but the adjustment of the process often needs to be combined with other hydraulic elements (such as a proportional valve, a servo valve, a throttle valve and the like), and the adjustment elements need to be realized by additional driving, for example, the proportional valve and the servo valve need to be driven by external voltage, and the throttle valve needs to be driven manually. In recent years, with the development of new energy and the improvement of energy-saving requirements, the flow-induced vibration gradually becomes an important energy source, and the flow-induced vibration piezoelectric energy harvesting technology is also widely studied. The piezoelectric energy harvesting technology using the piezoelectric material is a hot spot for research of the energy harvesting technology at home and abroad at present, and the technology utilizes voltage change caused by deformation of the piezoelectric material in the flow blocking process to draw energy, and has the advantages of simple structure, no electromagnetic interference, no pollution, no heat generation, easy miniaturization and integration and the like. If the pressure pulsation is captured, electric energy is generated and the pressure pulsation is used for pressure pulsation frequency adjustment driving, the device has important practical significance.
Disclosure of Invention
Aiming at pressure pulsation in a hydraulic system, the characteristics of a Helmholtz attenuator are combined, a piezoelectric material is arranged in a pipeline system of the hydraulic system, the piezoelectric material is deformed and generates electric energy under the excitation of pulsating pressure, and then a proportional electromagnet is driven by the electric energy and used for adjusting the diameter of a damping hole of a frequency adjusting damper so as to seek an optimal pressure pulsation attenuation working point.
The utility model provides a no electricity driving frequency adjustable pressure pulsation attenuator includes proportion electro-magnet, push rod, frequency control end cover, helm Huo Cirong chamber, casing, frequency control attenuator, O type circle, spring, lower extreme cover, piezoelectricity energy harvesting subassembly, frequency control unit, electric capacity, energy harvesting control unit etc.. The two sides of the shell are provided with an inlet and an outlet, a blind hole is formed in the shell, the middle of the shell is provided with a main channel, and the shell is connected with a pipeline system through bolts. A Helmholtz damping hole is formed above the main channel and is connected with the Helmholtz cavity, the Helmholtz cavity Huo Cirong is connected with the shell in a welding, threaded, bolt and other modes, the size of the Helmholtz damping hole can be adjusted through a frequency adjusting damper, and the axial direction of the Helmholtz damping hole and the Helmholtz damping hole is vertical; the lower part of the main channel is connected with a piezoelectric energy harvesting inlet and is used for being connected with a piezoelectric energy harvesting assembly to recycle pressure pulsation energy, convert the pressure pulsation energy into electric energy and provide electric energy for the adjustment of the frequency adjustment damper.
Furthermore, the left side and the right side of the frequency adjusting damper push the push rod to perform motion control through the proportional electromagnet, the springs are arranged in the middle of the frequency adjusting damper and the frequency adjusting damper to position, the left spring and the right spring are in a compression state initially, and the rigidity and the compression amount of the frequency adjusting damper are the same. One side of the spring is contacted with a spring positioning opening in the frequency adjusting damper, the other side of the spring is contacted with a frequency adjusting end cover, and the frequency adjusting end cover is provided with a countersunk groove for positioning a guide locking screw and a spring washer, and the countersunk groove can fix the frequency adjusting end cover on the shell and seal the frequency adjusting end cover by means of an O-shaped ring; the proportion electromagnet is connected with the frequency adjusting end cover through an inner hexagon screw, and the end face is sealed by means of an O-shaped ring. The two side end surfaces of the frequency adjusting damper are round spring positioning openings and are used for guiding springs, a frequency adjusting control opening in a combination mode of a round triangular groove and a triangular groove is arranged in the middle of the frequency adjusting damper, and when the push rod moves left and right, the changing area of the triangular groove is smaller than the changing area of the round triangular groove. The frequency adjusting damper is provided with the pressure equalizing grooves at the periphery, so that liquid can enter the pressure equalizing grooves in the frequency adjusting process, and the pressure equalizing grooves are coaxial with the mounting holes on the shell, so that friction force is reduced.
Further, the piezoelectric energy harvesting component comprises a disc spring, a guide piston, a Style sealing ring and piezoelectric ceramics. The disc spring is in a compression state at the beginning, so that the guide piston and the piezoelectric ceramic are tightly attached to the spigot of the lower end cover, and the lower end cover is connected to the shell through the inner hexagon screw. The guide piston is provided with a circular groove for accommodating the Style sealing ring. The piezoelectric ceramics can be stacked in the axial direction, multiple groups can be arranged in the circumferential direction and used for increasing the electric energy generation amount, and the specific installation layout is related to the power required by the proportional electromagnet and the size of the shell.
Furthermore, the electric energy generated by the piezoelectric ceramic is connected to the frequency control unit through a wire, the electric energy is stored in a capacitor, and the capacitor is connected with the energy harvesting control unit and used for supplying power to the proportional electromagnet. The frequency control unit, the capacitor and the energy harvesting control unit are respectively arranged at the left side and the right side of the shell.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention recovers the pressure pulsation energy in the hydraulic system by adopting a piezoelectric energy harvesting technology, changes the pressure pulsation energy into electric energy, and is used for driving the proportional electromagnet to realize the electroless driving of the low-power consumption element of the hydraulic system.
(2) The diameter of a damping hole of the Helmholtz attenuator is changed by adjusting the size of an electric signal input by a proportional electromagnet, and the damping hole can be subjected to feedback adjustment according to the characteristics of pressure pulsation, so that the maximum degree attenuation of the pressure pulsation is realized.
(3) The structure has high integration level, and can be applied to pressure pulsation attenuation in power supply tension occasions such as underwater vehicles, aerospace and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view taken in the direction A-A of FIG. 1;
FIG. 3 is a schematic diagram of a frequency tuned damper;
FIG. 4 is a schematic structural view of a piezoelectric energy harvesting assembly;
FIG. 5 is a schematic diagram of the operation of the attenuator;
The above figures are identified as: 1. a proportional electromagnet; 2. an inner hexagon screw; 3. a push rod; 4. a frequency adjustment end cap; 5. a helm Huo Cirong chamber; 6. a housing; 7. a locking screw; 8. a spring washer; 9. a frequency adjustment damper; 10. an O-ring; 11. a spring; 12. a frequency control unit; 13. a capacitor; 14. a energy harvesting control unit; 15. a lower end cap; 16. a piezoelectric energy harvesting assembly; 6.1, piezoelectric energy harvesting import; 6.2, inlet; 6.3, an outlet; 6.4, a Helmholtz damping hole; 6.5, a main channel; 9.1, a spring positioning port; 9.2, a pressure equalizing tank; 9.3, a frequency adjustment control port; 16.1, a disc spring; 16.2, guiding the piston; 16.3, a stirling seal; 16.4, piezoelectric ceramics.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Fig. 1 and 2 show an embodiment of the present invention, which comprises a proportional electromagnet 1, an inner hexagon screw 2, a push rod 3, a frequency adjusting end cover 4, a helm Huo Cirong cavity 5, a shell 6, a locking screw 7, a spring washer 8, a frequency adjusting damper 9, an O-ring 10, a spring 11, a frequency control unit 12, a capacitor 13, a energy harvesting control unit 14, a lower end cover 15 and a piezoelectric energy harvesting assembly 16. The two sides of the shell 6 are provided with an inlet 6.2 and an outlet 6.3, blind holes are formed in the shell, a main channel 6.5 is arranged in the middle of the shell, and the shell is connected with a pipeline system through bolts. A Helmholtz damping hole 6.4 is formed above the main channel 6.5 and is connected with the Helmholtz damping cavity 5, the volume of the cavity is designed according to actual working conditions, the cavity and the shell 6 can be connected in a welding, threaded, bolt and other modes, the size of the Helmholtz damping hole 6.4 can be adjusted through a frequency adjusting damper 9, and the axial direction of the Helmholtz damping hole and the Helmholtz damping hole is vertical; the lower part of the main channel 6.5 is connected with a piezoelectric energy harvesting inlet 6.1 and is used for being connected with a piezoelectric energy harvesting assembly 12 to recycle pressure pulsation energy, convert the pressure pulsation energy into electric energy and provide electric energy for the adjustment of the frequency adjustment damper 9.
The left side and the right side of the frequency adjusting damper 9 push the push rod 3 to perform motion control through the proportional electromagnet 1, a spring 11 is arranged between the two springs to perform positioning, the left spring 11 and the right spring 11 are in a compression state initially, the rigidity and the compression quantity are the same, and therefore the frequency adjusting damper 9 is in the middle position of the shell 6 in the non-working state, and the opening of the Helmholtz damping hole 6.4 is the largest. One side of the spring 11 is contacted with a spring positioning opening 9.1 in the frequency adjusting damper 9, the other side is contacted with the frequency adjusting end cover 4, the frequency adjusting end cover 4 is provided with a countersunk groove for positioning a guide locking screw 7 and a spring washer 8, and the frequency adjusting end cover 4 can be fixed on the shell 6 and sealed by an O-shaped ring 10; the proportion electromagnet 1 is connected with the frequency adjusting end cover 4 through an inner hexagon screw 2, and is sealed by an O-shaped ring 10.As shown in fig. 3, the end surfaces at two sides of the frequency adjusting damper 9 are circular spring positioning openings 9.1 and are used for guiding springs 11, a frequency adjusting control opening 9.3 in a combination mode of a circular shape and a triangular groove is arranged in the middle, when the push rod 3 moves left and right, the changing area of the triangular groove is smaller than the changing area of the circular shape, on one hand, the size of the helmholtz damping hole 6.4 can be changed from large to small, on the other hand, the helmholtz damping hole 6.4 can be ensured to be changed from large to small, gradual trend can be shown instead of the fact that the pressure impact when liquid enters the helmholtz Huo Cirong cavity is reduced. The frequency adjusting damper 9 is provided with the pressure equalizing grooves 9.2 around, so that liquid can enter the pressure equalizing grooves 9.2 in the frequency adjusting process, and the pressure equalizing grooves and the mounting holes on the shell 6 are kept coaxial, and the friction force between the frequency adjusting damper 9 and the mounting holes is reduced.
The piezoelectric energy harvesting assembly 16 is shown in fig. 4 and includes a disc spring 16.1, a pilot piston 16.2, a stirling seal 16.3 and a piezoelectric ceramic 16.4. The disc spring 16.1 is initially in a compressed state, so that the guide piston 16.2 and the piezoelectric ceramic 16.4 are both tightly attached to the spigot of the lower end cover 15, and the lower end cover 15 is connected to the housing 6 through an inner hexagon screw. The guide piston 16.2 has a circular groove for receiving the stirling seal 16.3, which prevents the outflow of liquid from the housing 6, and which serves to reduce friction. The piezoelectric ceramics 16.4 can be in a mode of stacking a plurality of piezoelectric ceramics in the axial direction, a plurality of groups can be arranged in the circumferential direction and used for increasing the electric energy generation amount, and the specific installation layout is related to the power required by the proportional electromagnet 1, the shell size and the like.
The electric energy generated by the piezoelectric ceramic 16.4 is connected to the frequency control unit 12 through a wire, and is stored in the capacitor 13, and the capacitor 13 is connected with the energy harvesting control unit 14 for supplying power to the proportional electromagnet 1. The frequency control unit 12, the capacitor 13 and the energy harvesting control unit 14 are 1 on each of the left and right sides of the housing.
After the liquid enters from the inlet 6.2 of the attenuator, most of the liquid flows into the outlet 6.3 through the main channel 6.5; a part of the liquid can flow into the helmholtz attenuator through the helmholtz damping hole 6.4, and the pressure pulsation is attenuated but not completely eliminated due to the resistance attenuation effect of the helmholtz attenuator; at this time, the unattenuated part of the pulsating fluid enters the piezoelectric energy harvesting assembly 16 through the pressure energy harvesting inlet 6.1, and the guiding piston 16.2 reciprocates up and down under the action of the pressure pulsation, so as to drive the piezoelectric ceramic 16.4 to generate axial deformation and generate electric energy.
Initially, the helmholtz damping hole 6.4 is the largest in opening, and is not necessarily at the optimal damping action point, the proportional electromagnet 1 is not powered, and both push rods 3 cannot move. But at this time, the piezoelectric energy harvesting component 16 starts to generate electric energy, and the electric energy is stored in the two capacitors 13 through rectifying, amplifying and other processes in the energy harvesting control unit 14. The pressure sensor detects a pressure signal, and controls the current input into one (right) proportional electromagnet 1 at the frequency control unit 12, so as to control the position of the push rod 3, change the size of the Helmholtz damping hole 6.4, reach the optimal damping point, and the right capacitor is in a discharging state in the process, the left capacitor can be continuously charged, and the left proportional electromagnet is in a non-working state through the frequency control unit, as shown in fig. 5. If the right capacitor is insufficient in electric energy, the right proportional electromagnet can be powered off, the right capacitor is charged, the left proportional electromagnet is powered on, and the left capacitor is in a discharging state. The method is repeated continuously, electric energy is continuously generated and is charged in one capacitor, and the other capacitor is discharged to supply power to the proportional electromagnet, so that the electric energy is sufficient, the size of a damping hole of the Helmholtz attenuator can be adjusted at any moment, and the aim of optimal attenuation of pressure pulsation is fulfilled.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (2)
1. An electroless driving frequency adjustable pressure pulsation attenuator, characterized in that: the device comprises a proportion electromagnet, a push rod, a frequency adjusting end cover, a Helmholtz Huo Cirong cavity, a shell, a frequency adjusting damper, an O-shaped ring, a spring, a lower end cover, a piezoelectric energy harvesting component, a frequency control unit, a capacitor, an energy harvesting control unit, an inner hexagon screw, a locking screw and a spring washer; the two sides of the shell are provided with an inlet and an outlet, a blind hole is formed in the shell, the middle is provided with a main channel, and the main channel is connected with a pipeline system through bolts; a Helmholtz damping hole is formed above the main channel and is connected with the Helmholtz cavity, the Helmholtz cavity Huo Cirong is connected with the shell in a welding, threaded and bolt mode, the size of the Helmholtz damping hole can be adjusted through a frequency adjusting damper, and the axial direction of the Helmholtz damping hole is perpendicular to the axial direction of the Helmholtz damping hole; the end surfaces of two sides of the Helmholtz attenuator are circular spring positioning openings and are used for guiding springs, a frequency adjusting control opening in a circular and triangular groove combined mode is arranged in the middle of the Helmholtz attenuator, and when the push rod moves left and right, the changing area of the triangular groove is smaller than the changing area of the circular shape; the periphery of the Helmholtz attenuator is provided with a pressure equalizing groove; the left side and the right side of the Helmholtz attenuator push the push rod to perform motion control through a proportional electromagnet, a spring is arranged between the two to position the two, the left spring and the right spring are in a compression state at the beginning, and the rigidity is the same as the compression amount; the lower part of the main channel is connected with a piezoelectric energy harvesting inlet and is used for connecting a piezoelectric energy harvesting assembly; the piezoelectric energy harvesting component comprises a disc spring, a guide piston, a Style sealing ring and piezoelectric ceramics; the disc spring is in a compression state at the beginning, so that the guide piston and the piezoelectric ceramic are tightly attached to the spigot of the lower end cover, and the lower end cover is connected to the shell through an inner hexagon screw; the guide piston is provided with a circular groove for accommodating a Style sealing ring; the piezoelectric ceramics can be stacked in the axial direction, and a plurality of groups of piezoelectric ceramics can be arranged in the circumferential direction for increasing the electric energy generation amount; the electric energy generated by the piezoelectric ceramic is connected to the frequency control unit through a wire, and is stored in a capacitor, and the capacitor is connected with the energy harvesting control unit and used for supplying power to the proportional electromagnet; the frequency control unit, the capacitor and the energy harvesting control unit are respectively arranged at the left side and the right side of the shell.
2. An electroless driving frequency adjustable pressure pulsation attenuator according to claim 1, wherein: one side of the spring is contacted with a spring positioning opening in the Helmholtz attenuator, the other side of the spring is contacted with a frequency adjusting end cover, and the frequency adjusting end cover is provided with a countersunk groove for positioning a guide locking screw and a spring washer, and the countersunk groove can fix the frequency adjusting end cover on the shell and seal the frequency adjusting end cover by means of an O-shaped ring; the proportion electromagnet is connected with the frequency adjusting end cover through an inner hexagon screw, and the end face is sealed by means of an O-shaped ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910972673.6A CN110594336B (en) | 2019-10-14 | 2019-10-14 | Pressure pulsation attenuator with adjustable electroless driving frequency |
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| CN201910972673.6A CN110594336B (en) | 2019-10-14 | 2019-10-14 | Pressure pulsation attenuator with adjustable electroless driving frequency |
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| CN110594336B true CN110594336B (en) | 2024-04-30 |
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| CN111739500B (en) * | 2020-06-01 | 2023-07-25 | 南京航空航天大学 | Perforated sandwich plate underwater broadband sound absorption structure decorated by damping layer |
| CN114922884B (en) * | 2022-05-06 | 2023-03-28 | 燕山大学 | Broadband pressure pulsation attenuator for hydraulic pipeline and working process thereof |
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