CN117703988A - Cavity pressure balance damper - Google Patents
Cavity pressure balance damper Download PDFInfo
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- CN117703988A CN117703988A CN202311792884.4A CN202311792884A CN117703988A CN 117703988 A CN117703988 A CN 117703988A CN 202311792884 A CN202311792884 A CN 202311792884A CN 117703988 A CN117703988 A CN 117703988A
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- damping
- pressure
- oil
- piston
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- 238000013016 damping Methods 0.000 claims abstract description 182
- 230000001502 supplementing effect Effects 0.000 claims abstract description 51
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000007667 floating Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000002829 reductive effect Effects 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a cavity pressure balance damper, and relates to the technical field of hydraulic dampers. The damping piston divides the inner cavity of the differential cavity inner cylinder into an oil supplementing cavity, a rod damping cavity and a rodless damping cavity through a partition wall sealed by an inner cylinder ring of the differential cavity, and limits a piston rod to the oil supplementing cavity and the inner cylinder of the differential cavity for reciprocating motion; the damping valve is communicated with a rod damping cavity through an outer cylinder inclined passage to form an externally arranged adjustable damping oil way for regulating hydraulic pressure at any time, and the oil supplementing one-way damping valve communicated with the damping valve is opened and timely supplemented with oil by utilizing pressure differential pressure generated by hydraulic fluid between the rod damping cavity and a rodless damping cavity to control the flow of the hydraulic fluid, inhibit the back and forth oscillating movement stroke of an output shaft of a piston rod and play a damping role; when the pressure in the oil supplementing cavity of the damper changes, the floating piston assembled in the moving cavity of the piston rod large-diameter damping cylinder moves based on the pressure change of the inner cavity of the piston cylinder, so that the oil return pressure and the atmospheric pressure of the oil supplementing cavity are balanced, and the movement of the piston rod caused by the pressure change of the inner cavity is reduced.
Description
Technical Field
The invention relates to the technical field of hydraulic dampers, in particular to a small-hole throttling type linear single-rod differential structure cavity pressure balance damper capable of balancing the pressure of an internal oil return cavity and the atmospheric pressure and avoiding the piston rod from moving due to the action of pressure difference.
Background
Various friction and other impeding effects that attenuate free vibration are known as damping. While "special" members placed on the structural system may provide resistance to movement, a device that dissipates movement energy, known as a damper. When the mechanical structure works, vibration and impact are caused by the motion of the mechanical mechanism or external force. The damping of the mechanism is small, so that the motion stability of the mechanism is poor or unstable, even resonance occurs, and the mechanism is damaged. Hydraulic dampers are devices that provide resistance to movement and consume movement energy. The hydraulic damper is a vibration control device sensitive to speed response;
the hydraulic damper is a mechanical system in motion, the working process is a dissipation process, and the function of damping or inhibiting the too fast motion of the mechanical system is realized by converting mechanical energy into heat energy. The piston in the damper moves to force the liquid in the damping cylinder to flow through the damping element (small holes or gaps or the combination of the small holes and the gaps) so that liquid molecules are mutually extruded and rubbed, and the mechanical energy is converted into heat energy to be dissipated, thereby generating a damping effect. The hydraulic damper has the advantages of large damping force, convenient adjustment of damping coefficient, long service life and good heat dissipation. Compared with other dampers, the hydraulic damper has the advantages of small volume, light weight, simple structure and wide application. Dampers come in various forms, such as pulsation dampers, magnetorheological dampers, rotary dampers, linear dampers, etc., and different dampers may be different in form, but the principle is the same, so as to reduce vibration, convert friction into internal energy, and drive the whole system to operate. The hydraulic damper currently applied to the aerospace field is required to be small in installation size, light in weight and reliable in structure. The damping force is high in precision, strong in environmental adaptability, stable in performance, good in weather resistance and adjustable in part of required damping performance. However, the existing hydraulic damper has the following problems: the piston rod of the conventional differential hydraulic damper can move when the internal pressure changes, so that the performance of the damper is affected. Inside a conventional damper, the damper compresses rebound with both damping oil occupied and rebound volumes. There is some response delay between this and the change in damping oil volume, which can cause the shock absorber to slow down in response and the damping force to be unbalanced as it extends and retracts.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the linear damper based on compensation cavity pressure balance, which has reliable structure, stable damping performance and good adaptability, so as to solve the technical problem that a piston rod can move when the internal pressure of the hydraulic damper in the prior art changes,
the technical scheme adopted for solving the technical problems is as follows: a cavity pressure balanced damper comprising: the damping piston rod 1 is characterized in that the damping piston rod 1 is in telescopic motion in the differential cavity inner cylinder 7, the differential cavity inner cylinder 7 is sealed in the inner cavity of the outer cylinder 3 through an end cover 2 ring, and the damping valve 13 of the damping piston 8 and the oil supplementing one-way damping valve 14 are communicated with the tail part of the outer cylinder, and the damping piston rod 3 is provided with an outer cylinder earring 12: the damping piston 9 connected to the tail end of the large-diameter damping cylinder of the damping piston rod 1 divides the inner cavity of the differential cavity inner cylinder 7 into an oil supplementing cavity 4, a damping piston 8 and a rodless damping cavity 11 through a partition wall sealed by the differential cavity inner cylinder 7, and limits the piston rod 1 to reciprocate in the oil supplementing cavity 4 and the differential cavity inner cylinder 7; the damping valve 13 is communicated with the damping piston 8 through an inclined passage of the outer cylinder 3 to form an externally arranged adjustable damping oil way for regulating hydraulic pressure at any time, and the oil supplementing one-way damping valve 14 communicated with the damping valve 13 is opened and timely supplemented with oil by utilizing pressure differential pressure generated by hydraulic fluid between the damping piston 8 and the rodless damping cavity 11 to control the flow of the hydraulic fluid and inhibit the back and forth oscillating movement stroke of the output shaft of the piston rod 1 to play a damping role; when the pressure in the pressure oil cavity of the damper changes, the floating piston 6 assembled in the moving cavity of the large-diameter damping cylinder of the plug rod 1 moves along with the change of the pressure in the inner cavity of the piston cylinder 5, so that the return oil pressure and the atmospheric pressure of the oil supplementing cavity 4 are balanced, and the movement of the piston rod caused by the change of the pressure in the inner cavity is reduced.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the damping valve 13 and the oil supplementing one-way damping valve 14 of the damping piston 8 which are communicated with the tail part of the outer cylinder, the differential cavity inner cylinder 7 which is sealed in the inner cavity of the outer cylinder 3 through the end cover 2 ring, and the damping piston rod 1 which performs telescopic movement in the differential cavity inner cylinder 7 has reasonable structure and reliable structure. Because the damping rod on one side enters the damping cavity and the damping rod on the other side exits from the damping cavity, the volume of the damping cavity is kept unchanged at any time, and the problem of volume change of damping oil is solved.
The invention adopts a damping piston 9 connected to the tail end of a large-diameter damping cylinder of a damping piston rod 1 and is divided into an oil supplementing cavity 4, a damping piston 8 and a rodless damping cavity 11 by a partition wall sealed by a differential cavity inner cylinder 7 in a ring, and the piston rod 1 is limited in the oil supplementing cavity 4 and the differential cavity inner cylinder 7 to do reciprocating motion; the floating piston 6 arranged in the piston cylinder 5 balances the pressure of the oil compensating cavity in the hydraulic damper with the atmospheric pressure, plays a role in volume compensation with stable damping performance, reduces the phenomenon of movement of the piston rod when the internal pressure of the hydraulic damper changes, and improves the stability of the performance of the hydraulic damper.
The hydraulic fluid is controlled to flow by utilizing the pressure difference generated by the hydraulic fluid between the damping piston 8 and the rodless damping cavity 11 to start and timely supplement oil, so that the back and forth oscillating movement stroke of the output shaft of the piston rod 1 is restrained, and the damping effect is achieved; because the piston rod 1 adopts a through shaft design, the pressures at two sides of the damping piston in the damping cavity are more balanced, so that the damping piston is helpful to deal with the shock-absorbing reaction more actively. When the pressure in the pressure oil cavity of the damper changes, the floating piston 6 assembled in the moving cavity of the large-diameter damping cylinder of the plug rod 1 moves along with the change of the pressure in the inner cavity of the piston cylinder 5, so that the return oil pressure and the atmospheric pressure of the oil supplementing cavity 4 are balanced, and the movement of the piston rod caused by the change of the pressure in the inner cavity is reduced. The damping characteristics are utilized to slow down mechanical vibration and consume kinetic energy, the problem that the traditional damper compresses rebound and simultaneously occupies the volume and recovers the volume with damping oil is perfectly solved, and meanwhile, the problem of balancing the volume of a damping cavity is solved, so that the reliability is improved, and meanwhile, the response speed of the damper is improved.
The invention can be widely applied to industries such as aviation, aerospace, automobiles, construction, road and bridge railways and the like. In mechanical engineering, ground moving vehicles, aircraft handling systems, etc. The hydraulic damper can be applied to a large-scale aircraft control system, prevents a pilot from excessively manipulating, enables the aircraft to be overloaded too much, eliminates abnormal instruction input caused by system vibration, and protects the flight safety of the aircraft.
Drawings
FIG. 1 is a front view of a chamber pressure balance damper of the present invention;
FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a C-C cross-sectional view of FIG. 1;
FIG. 4 is a partial view of the aft adjustable damping valve flowpath of FIG. 3;
in the figure: the damping device comprises a damping piston rod 1, an end cover 2, an outer cylinder 3, an oil supplementing cavity 4, a piston cylinder 5, a floating piston 6, a differential cavity inner cylinder 7, a rod damping cavity 8, a damping piston 9, a one-way damping valve 10, a rodless damping cavity 11, an outer cylinder earring 12, a damping valve 13 and an oil supplementing one-way damping valve 14.
The invention will be further described with reference to the drawings and examples, without thereby restricting the invention to the scope of the examples. All such concepts should be considered as being generic to the disclosure herein and to the scope of the invention.
Detailed Description
See fig. 1-4. In a preferred embodiment described below, a chamber pressure balance damper comprises: the outer cylinder 3 with the outer cylinder earring 12, the damping valve 13 of the outer cylinder tail part is communicated with the damping piston 8 and the oil supplementing one-way damping valve 14, the differential cavity inner cylinder 7 is sealed in the inner cavity of the outer cylinder 3 through the end cover 2 ring, the damping piston rod 1 is in telescopic motion in the differential cavity inner cylinder 7, wherein: the damping piston 9 connected to the tail end of the large-diameter damping cylinder of the damping piston rod 1 divides the inner cavity of the differential cavity inner cylinder 7 into an oil supplementing cavity 4, a damping piston 8 and a rodless damping cavity 11 through a partition wall sealed by the differential cavity inner cylinder 7, and limits the piston rod 1 to reciprocate in the oil supplementing cavity 4 and the differential cavity inner cylinder 7; the damping valve 13 is communicated with the damping piston 8 through an inclined passage of the outer cylinder 3 to form an externally arranged adjustable damping oil way for regulating hydraulic pressure at any time, and the oil supplementing one-way damping valve 14 communicated with the damping valve 13 is opened and timely supplemented with oil by utilizing pressure differential pressure generated by hydraulic fluid between the damping piston 8 and the rodless damping cavity 11 to control the flow of the hydraulic fluid and inhibit the back and forth oscillating movement stroke of the output shaft of the piston rod 1 to play a damping role; when the pressure in the pressure oil cavity of the damper changes, the floating piston 6 assembled in the moving cavity of the large-diameter damping cylinder of the plug rod 1 moves along with the change of the pressure in the inner cavity of the piston cylinder 5, so that the return oil pressure and the atmospheric pressure of the oil supplementing cavity 4 are balanced, and the movement of the piston rod caused by the change of the pressure in the inner cavity is reduced.
The damping piston 9 connected with the free end wall of the hollow extension body is arranged at the end of the journal damping rod on the piston rod 1, and the hollow extension body is internally provided with a piston cylinder 5 which extends into a stepped hole of the damping piston 9 to separate an oil cavity from the atmosphere.
In an alternative embodiment described below, the damping piston 9 shaft end stepped annular seal has a one-way valve 10 attached to the piston cylinder 5 end-on block.
The hollow extension body of the piston rod 1 is slidably arranged in the channel of the oil supplementing cavity 4, and the large-diameter damping cylinder extends into the differential cavity inner cylinder 7; when compression force is applied to the damping piston 9 to do push-pull motion, the damping piston 9 slides in the differential cavity inner cylinder 7, the volume between the damping piston 8 and the rodless damping cavity 11 is changed, the pressure of hydraulic fluid is transmitted through the damping piston 9, reverse acting force is continuously and circularly applied to control the opening or closing of the one-way damping valve 10, and the one-way flow of the hydraulic fluid of the damping piston 8, the rodless damping cavity 11 and the oil supplementing cavity 4 is realized.
A floating piston 6 for separating oil from the atmosphere is arranged in the hollow extension cavity of the piston cylinder 5, and the floating piston 6 separates the inner cavity from the atmosphere. Further, the floating piston 6 can balance the oil return pressure of the oil supplementing cavity 4 of the oil supplementing cavity of the differential hydraulic damper with the atmospheric pressure, when the oil return pressure of the oil supplementing cavity 4 is larger than the atmospheric pressure, the floating piston 6 is pushed to move leftwards, the oil return volume of the oil supplementing cavity 4 is increased, the pressure of the oil supplementing cavity of the damper is reduced, when the oil return pressure of the oil supplementing cavity 4 is smaller than the atmospheric pressure, the floating piston 6 is pushed to move rightwards, the oil return volume of the oil supplementing cavity 4 is reduced, and the pressure of the oil supplementing cavity of the damper is increased.
Optionally, the method comprises the step of. The damping piston 9 controls the pressure, differential volume and compression ratio in the left and right cavities of the differential cavity inner cylinder 7, meanwhile, the damping valve 13 assembled through the inclined hole in the bus direction of the outer cylinder 3 extends into the damping piston 8 through the adjustable damping valve rod to adjust the pressure of a damping oil path at any time, the oil supplementing one-way damping valve 14 connected with the damping valve 13 is opened by utilizing the pressure difference of hydraulic fluid pressure between the damping piston 8 and the rodless damping cavity 11 to timely supplement oil, and the flow of the hydraulic fluid is further controlled, so that the back and forth oscillating movement stroke of the output shaft of the piston rod 1 is effectively restrained, and the damping effect is achieved.
Optionally, when the piston rod 1 moves to be pressed into the rodless cavity 11, the one-way damping valve 10 is opened, the one-way damping valve 14 is closed, a part of oil in the rodless cavity 11 is pressed into the rod cavity 8 and the oil supplementing cavity 4 through the upper one-way damping valve 10, and the other part of oil flows into the oil supplementing cavity 4 through the one-way damping valve 14 to generate damping effect. When the piston rod 1 moves to extend out of the rodless cavity 11, the one-way damping valve 14 is opened, the one-way damping valve 10 is closed, part of oil in the rod cavity 8 and the oil supplementing cavity 4 flows into the rodless cavity 11 through the one-way damping valve 14, and the other part of oil flows into the rodless cavity 11 through the one-way damping valve 10 to generate damping effect.
While the embodiments of the present invention have been described in detail and illustrated in the drawings, the present invention is not limited to the embodiments and the application range of the present invention, and those skilled in the art will appreciate that the embodiments and the application range of the present invention can be modified according to the spirit of the present invention.
Claims (10)
1. A cavity pressure balanced damper comprising: the damping piston rod (1) of telescopic motion is carried out in differential chamber inner tube (7) in urceolus (3) inner chamber through end cover (2) ring seal, and differential chamber inner tube (7), its characterized in that in urceolus afterbody intercommunication has damping valve (13) and the one-way damping valve (14) of oil filling of pole damping chamber (8): the damping piston (9) connected to the tail end of the large-diameter damping cylinder of the damping piston rod (1) divides the inner cavity of the differential cavity inner cylinder (7) into an oil supplementing cavity (4), a rod-containing damping cavity (8) and a rodless damping cavity (11) through a partition wall for annular sealing of the differential cavity inner cylinder (7), and limits the piston rod (1) to the oil supplementing cavity (4) and the differential cavity inner cylinder (7) to do reciprocating motion; the damping valve (13) is communicated with the rod damping cavity (8) through an inclined passage of the outer cylinder (3) to form an externally arranged adjustable damping oil path for regulating hydraulic pressure at any time, and is communicated with the oil supplementing one-way damping valve (14) of the damping valve (13), so that the hydraulic fluid is controlled to flow by utilizing the pressure difference generated by the hydraulic fluid between the rod damping cavity (8) and the rodless damping cavity (11) to control the hydraulic fluid to control the back and forth oscillating movement stroke of the output shaft of the piston rod (1) to play a damping role; when the pressure in the oil supplementing cavity (4) of the damper changes, a floating piston (6) assembled in the moving cavity of the large-diameter damping cylinder of the plug rod (1) balances the oil returning pressure and the atmospheric pressure of the oil supplementing cavity (4) based on the change of the pressure in the inner cavity of the piston cylinder (5) and reduces the movement of the piston rod caused by the change of the pressure in the inner cavity.
2. The cavity pressure balanced damper according to claim 1, wherein: a damping piston (9) connected with the free end wall of the hollow extension body is arranged at the end of a journal damping rod on the piston rod (1), and a piston cylinder (5) which extends into a stepped hole of the damping piston (9) to separate an oil cavity from the atmosphere is assembled in the hollow extension body.
3. The cavity pressure balanced damper according to claim 1, wherein: the step hole ring at the shaft end of the damping piston (9) is sealed with a one-way valve (10) connected with the end-to-end blockage of the piston cylinder (5).
4. The cavity pressure balanced damper according to claim 1, wherein: the hollow extension body of the piston rod (1) is slidably arranged in the channel of the oil supplementing cavity (4), and the large-diameter damping cylinder extends into the differential cavity inner cylinder (7).
5. The cavity pressure balanced damper according to claim 1, wherein: when compression force is applied to the damping piston (9) to do push-pull motion, the damping piston (9) slides in the differential cavity inner cylinder (7), the volume between the rod-shaped damping cavity (8) and the rodless damping cavity (11) is changed, the pressure of hydraulic fluid is transmitted through the damping piston (9), reverse acting force is continuously and circularly applied to control the opening or closing of the one-way damping valve (10), and the one-way flow of the hydraulic fluid of the rod-shaped damping cavity (8), the rodless damping cavity (11) and the oil supplementing cavity (4) is realized.
6. The cavity pressure balanced damper according to claim 1, wherein: a floating piston (6) for separating oil from the atmosphere is arranged in a hollow extension cavity of the piston cylinder (5), and the floating piston (6) divides the inner cavity into a compensation cavity and a pressure cavity.
7. A cavity pressure balanced damper according to claim 6, wherein: the floating piston (6) balances the oil return pressure and the atmospheric pressure of the oil supplementing cavity (4) of the oil pressing cavity of the differential hydraulic damper, when the oil return pressure of the oil supplementing cavity (4) is larger than the atmospheric pressure, the floating piston (6) is pushed to move leftwards, the oil return volume of the oil supplementing cavity (4) is increased, the pressure of the oil pressing cavity of the damper is reduced, when the oil return pressure of the oil supplementing cavity (4) is smaller than the atmospheric pressure, the floating piston (6) is pushed to move rightwards, the oil return volume of the oil supplementing cavity (4) is reduced, and the pressure of the oil pressing cavity of the damper is increased.
8. The cavity pressure balanced damper according to claim 1, wherein: the damping piston (9) controls the pressure, differential volume and compression ratio in the left and right cavities of the differential cavity inner cylinder (7), and simultaneously, a damping valve (13) assembled through an inclined hole in the bus direction of the outer cylinder (3) extends into the rod damping cavity (8) through an adjustable damping valve rod to adjust the pressure of a damping oil path at any time.
9. The cavity pressure balanced damper according to claim 8, wherein: the oil supplementing one-way damping valve (14) connected with the damping valve (13) is opened by utilizing the pressure difference of hydraulic fluid pressure between the rod damping cavity (8) and the rodless damping cavity (11) to timely supplement oil, and further controls the flow of the hydraulic fluid, so that the back and forth oscillating movement stroke of the output shaft of the piston rod (1) is effectively restrained.
10. The cavity pressure balanced damper according to claim 1, wherein: when the piston rod (1) is pressed into the rodless cavity (11), the one-way damping valve (10) is opened, the one-way damping valve (14) is closed, part of oil in the rodless cavity (11) is pressed into the rod cavity (8) and the oil supplementing cavity (4) through the upper one-way damping valve (10), and the other part of oil flows into the oil supplementing cavity (4) through the one-way damping valve (14) to generate damping effect; when the piston rod (1) moves to extend out of the rodless cavity (11), the one-way damping valve (14) is opened, the one-way damping valve (10) is closed, part of oil in the rod cavity (8) and the oil supplementing cavity (4) flows into the rodless cavity (11) through the one-way damping valve (14), and the other part of oil flows into the rodless cavity (11) through the one-way damping valve (10) to generate damping effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792884.4A CN117703988A (en) | 2023-12-25 | 2023-12-25 | Cavity pressure balance damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792884.4A CN117703988A (en) | 2023-12-25 | 2023-12-25 | Cavity pressure balance damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117703988A true CN117703988A (en) | 2024-03-15 |
Family
ID=90149632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311792884.4A Pending CN117703988A (en) | 2023-12-25 | 2023-12-25 | Cavity pressure balance damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117703988A (en) |
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2023
- 2023-12-25 CN CN202311792884.4A patent/CN117703988A/en active Pending
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