CN114876915B - Self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device - Google Patents

Self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device Download PDF

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CN114876915B
CN114876915B CN202210369754.9A CN202210369754A CN114876915B CN 114876915 B CN114876915 B CN 114876915B CN 202210369754 A CN202210369754 A CN 202210369754A CN 114876915 B CN114876915 B CN 114876915B
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pressure
air
liquid
chamber
cavity
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CN114876915A (en
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徐远志
王启帆
王任源
焦宗夏
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Beihang University
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Beihang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pipe Accessories (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

The invention relates to a self-pressure-adjusting gas-liquid coupling type fluid pulsation vibration damping device which comprises a shell, a leather bag and a piston, wherein a liquid chamber and a gas chamber which are isolated by the leather bag and the piston are arranged in the shell, and the liquid chamber and the gas chamber which are isolated by the leather bag and the piston are arranged in the shell. The leather bag is pre-punched in the air chamber, the liquid chamber is communicated with a hydraulic system pipeline, the piston can move along with the change of the pressure of the liquid chamber caused by the change of the oil pressure of the hydraulic system to change the volumes of the liquid chamber and the air chamber and adjust the pressure of the air chamber until the air pressure is balanced with the oil pressure, so that the leather bag can realize self-pressure adjustment to keep an elastic deformation state, can expand and contract between the liquid chamber and the air chamber to absorb the pressure pulsation of the liquid chamber, and realizes the function of inhibiting the fluid pulsation. Aiming at the characteristic of variable pressure of a closed system, the device has the characteristics of self-regulation of air chamber pressure along with liquid chamber pressure and vibration reduction of a gas-liquid coupling principle, and can realize the attenuation of fluid pulsation especially under the condition of large-range pressure change of a hydraulic system in wide temperature and wide frequency range.

Description

Self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device
A technical field
The invention belongs to the technical field of vibration absorption of fluid mechanical devices, and particularly relates to a self-pressure-regulating gas-liquid coupling type fluid pulsation vibration absorption device.
Second, background Art
With the development of hydraulic systems towards high speed, high pressure and high power, the problems of vibration and noise of hydraulic energy pipeline systems become more and more serious, and the problems become bottlenecks which restrict the development of hydraulic systems towards high pressure and low noise. The vibration of the hydraulic energy pipeline system not only further increases the system noise, but also is easy to cause the damage of hydraulic elements, and the reliability of the hydraulic system is reduced. Meanwhile, the pressure pulsation of the hydraulic system can also cause the vibration of the hydraulic pipeline, and particularly, when the frequency of the pressure pulsation is close to the natural frequency of the pipeline system, the resonance is easy to occur, so that the pipeline is subjected to fatigue damage, and serious accidents are caused in severe cases. Therefore, the flow pressure pulsation of the hydraulic system is effectively attenuated, and the method has extremely important significance for improving the reliability of the hydraulic system.
At present, in the field of vibration absorption, passive vibration absorption technology is mature in principle, and the main vibration absorption modes include absorption of pulsation by resonance and absorption of flow pulsation by reciprocating motion of a mechanical structure. At present, the existing vibration absorption devices can achieve good attenuation effect on the pulsation of a specific system to a certain extent, but are mainly designed for constant pressure systems, and cannot achieve good vibration absorption effect on variable pressure systems.
In conclusion, aiming at the variable pressure characteristic of the closed system, the pressure pulsation suppressor with pertinence is designed, and the pressure pulsation absorption performance of the closed system under the variable pressure working condition is optimized, so that the overall balanced optimal performance is achieved, the damage of the pressure pulsation to the system is reduced, and the fluid noise of the hydraulic system is reduced.
Third, the invention
The present invention aims to solve at least one of the above technical problems to a certain extent.
Therefore, the invention provides a self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device.
The technical scheme of the invention is as follows:
the gas-liquid coupling type fluid pulsation vibration damping device capable of automatically adjusting pressure comprises a shell, a leather bag and a piston, wherein a liquid chamber and an air chamber which are isolated by the leather bag and the piston are arranged in the shell, the piston can move along with the pressure change of the liquid chamber and adjust the pressure of the air chamber so as to enable the leather bag to keep elasticity, and the leather bag can expand and contract between the liquid chamber and the air chamber to absorb the pressure pulsation of the liquid chamber.
In the self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device, the piston is preferably movable between the liquid chamber and the gas chamber to change the volumes of the liquid chamber and the gas chamber, and the bladder is preferably expandable between the liquid chamber and the gas chamber to change the volumes of the liquid chamber and the gas chamber.
Above-mentioned gas-liquid coupled fluid pulsation damping device from pressure regulating, preferably, the casing includes vibration absorber and pressure regulating device, be equipped with first air cavity and first sap cavity through the leather bag isolation in the vibration absorber, be equipped with second air cavity and second sap cavity through the piston isolation in the pressure regulating device, second air cavity and first air cavity intercommunication form the air chamber, second sap cavity and first sap cavity intercommunication form the liquid chamber.
Preferably, the two ends of the leather bag are supported on the vibration absorber and are in a cylindrical structure.
Preferably, the vibration absorber comprises a first shell, an air cavity joint and a liquid cavity joint, the leather bag is located inside the first shell and connected with the air cavity joint and the liquid cavity joint, a first air cavity is formed between the interior of the leather bag and the air cavity joint, a first liquid cavity is formed between the exterior of the leather bag and the first shell, the air cavity joint is provided with a first air port communicated with the first air cavity, and the liquid cavity joint is provided with a first oil port and a plurality of oil through holes communicated with the first oil port and the first liquid cavity.
Preferably, the first shell is connected with a sleeve nut, the air cavity joint is in limit fit with the first shell and the sleeve nut, and the liquid cavity joint is in threaded fit with the first shell.
Preferably, the two ends of the leather bag are respectively provided with a flange plate connected with the air cavity joint or the liquid cavity joint.
Preferably, the pressure regulating device includes the second casing and connects with the casing that the second casing links to each other, the piston is located the second casing and with second casing sliding fit, forms the second air cavity between piston one end and the second casing, forms the second sap cavity between the piston other end and the second casing, be equipped with the second gas port with second air cavity intercommunication on the second casing, be equipped with the second hydraulic fluid port with the second sap cavity intercommunication on the casing connects.
Preferably, the bladder and the piston are combined into an integrated structure.
The above-mentioned gas-liquid coupled fluid pulsation vibration damping device with self-pressure regulation is preferably connected with an air supply device to the air chamber.
Preferably, the air chamber is connected with an air pressure sensor, the air supplementing device comprises an air source communicated with the air chamber and a controller connected with the air pressure sensor, and the controller is used for setting a threshold value and controlling the opening and closing of a communication channel between the air source and the air chamber according to a comparison result of feedback data of the threshold value and the air pressure sensor.
Compared with the prior art, the invention has the beneficial effects that:
(1) Aiming at the characteristic of variable pressure of a closed system, based on a structure that the volume of a variable air chamber and a liquid chamber is adapted to system vibration elimination, a piston moves along with the pressure difference of the liquid chamber and the air chamber, only the low-frequency pressure pulsation is reacted, the pressure of the air chamber is ensured to be equal to the mean pressure of the system to realize self-pressure regulation, so that a leather bag is ensured to be kept at a neutral balance position and to have elasticity all the time.
(2) The variable-volume liquid chamber and the air chamber are isolated by the leather bag and the piston to form a parallel gas-liquid coupling type vibration damping device, the piston can move after the air pressure changes to offset the pressure change caused by the temperature, the problem that the vibration damping effect is influenced by the temperature is solved, the vibration damping effect under a wide temperature range is realized under the condition of adapting to the variable-pressure working condition of a variable-pressure system, and the variable-volume vibration damping device is also suitable for the vibration damping of a constant-pressure system and a system with a large temperature transformation range.
(3) The problem of difficult gas sealing solved through the automatic air supply device reduces the gas tightness design difficulty, improves maintainability, makes the use scene more diversified.
(4) Through the specific structural improvement of the vibration absorber, the pressure regulating device or the vibration absorbing device, the disassembly, the assembly and the maintenance are convenient, and the ideal pressure pulsation attenuation is obtained.
In conclusion, the device has the characteristics that the gas chamber pressure is self-adjusted along with the liquid chamber pressure and the vibration is reduced by the gas-liquid coupling principle through the gas-liquid coupling type fluid pulsation vibration damping device with the self-pressure regulation function, and can realize the attenuation of fluid pulsation particularly under the large-range change of the pressure of a hydraulic system in wide temperature and wide frequency ranges.
Description of the drawings
Fig. 1 is a schematic diagram of an apparatus according to embodiment 1 of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
FIG. 3 is a diagram of the time domain simulation effect of the present invention.
FIG. 4 is a partial magnified view of the time domain simulation effect of the present invention.
Fig. 5 is a frequency domain plot of the simulation effect of the present invention.
Fig. 6 is a structural view of a vibration absorber according to embodiment 2 of the present invention.
Fig. 7 is a structural view of a pressure regulating device according to embodiment 3 of the present invention.
FIG. 8 is a structural view of an apparatus in embodiment 4 of the present invention.
In the figure: the damper comprises a shell 1, a damper 11, a first shell 111, an air cavity joint 112, a first air port 1121, a liquid cavity joint 113, a first oil port 1131, an oil through hole 1132, a sleeve nut 114, a first sealing groove 115, a first sealing boss 116, a first bolt 117, a second bolt 118, a third bolt 119, a pressure regulating device 12, a second shell 121, a second air port 1211, a second sealing groove 1212, a shell joint 122, a second oil port 1221, a second sealing boss 1222, a fourth bolt 123, a leather bag 2, a flange plate 201, a piston 3, a first sealing ring 301, a second sealing ring 302, an air chamber 4, a first air cavity 401, a second air cavity 402, a liquid chamber 5, a first liquid cavity 501, a second liquid cavity 502, a pump source 6, an air supplementing device 7, an air pressure sensor 701, a controller 703 and an air valve 704.
Detailed description of the preferred embodiments
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
When the existing vibration absorbing element, such as an energy accumulator and the like, adopts an isolated vibration absorbing element of a leather bag or a diaphragm to utilize gas energy storage to eliminate pulsation, the following problems exist: (1) The closed hydraulic system has periodic pressure pulsation due to a hydraulic pump, and meanwhile, due to the fact that the pressure mean value of the working principle of the closed hydraulic system is changed in a large range, the application effect of the prior art on a variable pressure system is poor. (2) Although the size of the device can be reduced well due to the small size of the airbag of the device, the pressure change of the gas affects the pressure range of the applicable vibration damping system due to the influence of the temperature of the gas pressure, and the temperature application range is not wide enough although the problem is considered in design and has certain adaptability to the temperature change range. (3) Due to the problem of difficult gas sealing caused by the self characteristics of gas, the device needs to be specially designed for achieving better gas tightness so as to obtain longer service life, the design difficulty is higher, the target realization is difficult, and the gas leakage problem of the device cannot be fundamentally solved.
Example 1:
fig. 1 shows a preferred embodiment of the self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device, which comprises a housing 1, a bladder 2 and a piston 3, wherein a liquid chamber 5 and an air chamber 4 which are isolated by the bladder 2 and the piston 3 are arranged in the housing 1, the piston can move along with the pressure change of the liquid chamber 5 and regulate the pressure of the air chamber 4 so as to enable the bladder 2 to keep elasticity, and the bladder 2 can expand and contract between the liquid chamber 5 and the air chamber 4 to absorb the pressure pulsation of the liquid chamber 5.
Preferably, the piston 3 can move between the liquid chamber 5 and the air chamber 4 to change the volume of the liquid chamber 5 and the air chamber 4, and the leather bag 2 can expand and contract between the liquid chamber 5 and the air chamber 4 to change the volume of the liquid chamber 5 and the air chamber 4.
Preferably, the housing 1 comprises a vibration absorber 11 and a pressure regulating device 12, a first air cavity 401 and a first liquid cavity 501 which are isolated by a leather bag 2 are arranged in the vibration absorber 11, a second air cavity 402 and a second liquid cavity 502 which are isolated by a piston 3 are arranged in the pressure regulating device 12, the second air cavity 402 is communicated with the first air cavity 401 to form an air cavity 4, and the second liquid cavity 502 is communicated with the first liquid cavity 501 to form a liquid cavity 5.
Preferably, an air supply device 7 is connected to the air chamber 4.
Preferably, the air chamber 4 is connected with an air pressure sensor 701, the air supply device 7 includes an air source 702 communicated with the air chamber 4 and a controller 703 connected with the air pressure sensor 701, and the controller 703 is configured to set a threshold value and control opening and closing of a communication channel between the air source 702 and the air chamber 4 according to a comparison result of feedback data of the threshold value and the air pressure sensor 701.
Preferably, the first air cavity 401 and the second air cavity 402, the first liquid cavity 501 and the second liquid cavity 502, and the air source 702 and the air cavity 4 are all communicated by using a pipeline, an air valve 704 is arranged on the pipeline between the air source 702 and the air cavity 4, the controller 703 adopts an embedded controller, and the embedded controller is electrically connected with the air valve 704 to control the opening and closing of the air valve 704.
Preferably, the first air cavity 401 and the second air cavity 402, the first liquid cavity 501 and the second liquid cavity 502, and the air source 702 and the air cavity 4 are all communicated by using a pipeline, an air valve 704 is arranged on the pipeline between the air source 702 and the air cavity 4, the controller 703 adopts an embedded controller, and the embedded controller is electrically connected with the air valve 704 to control the opening and closing of the air valve 704.
Fig. 2 shows a working process of the vibration damping device, which comprises the following working principles:
the air chamber 4 is pre-filled with gas with a certain pressure before the air chamber 4 is used, initial pressure is established, the gas can freely flow between the first air chamber 401 and the second air chamber 402, and a hydraulic oil pipeline of a pump source 6 of a hydraulic system is communicated with the liquid chamber 5;
after the hydraulic system starts, when the hydraulic system pressure is higher than the pressure of the air chamber 4, the hydraulic oil pushes the piston 3 of the pressure regulating device 12 through the liquid chamber 5, the volume of the second air chamber 402 is changed, so that the pressure of the second air chamber 402 rises, the balance between the air pressure and the oil pressure is finally achieved to realize self pressure regulation, the piston 3 only reacts to the pressure pulsation of low frequency due to the self quality and the motion damping, namely, the piston basically does not respond to the pulsation needing to be eliminated, the high-frequency vibration can be filtered, the piston motion is controlled by the mean pressure of the system pressure after the pulsation is removed, so that the pressure of the air chamber 4 is ensured to be equal to the mean pressure of the system, at the moment, the leather bag is in an elastic deformation state, so that the vibration eliminating effect of the vibration eliminator 11 is ensured.
The condition that no pressure pulsation exists in an actual system, and high-frequency vibration always exists in the pressure of a hydraulic system in the working process, so that the leather bag 2 of the vibration absorber 11 can do reciprocating motion of expansion and contraction near a middle balance position, the specific motion form is that when the pressure of oil in the first liquid cavity 501 is higher than the pressure of the first air cavity 401, the leather bag 2 contracts inwards, when the pressure of oil in the second liquid cavity 502 is lower than the pressure of the first air cavity 401, the leather bag 2 expands outwards, flow pulsation is throughput through the expansion and contraction motion of the leather bag 2, the volumes of the air chamber 4 and the liquid chamber 5 are changed, and accordingly the pressure pulsation is reduced.
When the system stops working, the system pressure is reduced, the piston 3 of the pressure regulating device 12 returns to the original position due to the action of air pressure, and the air pressure is reduced; in the working process or the storage process, the whole device may have a small amount of air leakage, the air supplement device 7 detects the pressure value of the air cavity in the state through the air pressure sensor 701, compares the pressure value with the threshold value of the preset pre-charging pressure, judges that the lower threshold value opens the air valve 704 when the pressure is lower than the preset pressure, and the upper threshold value closes the air valve 704 when the pressure is higher than the preset pressure, and can automatically realize air supplement and air pressure maintenance.
How to realize the variable pressure working condition of the adaptive variable pressure system and the vibration absorption effect in a wide temperature range is explained by the following derivation:
in order to ensure that the vibration-damping device can achieve a good vibration-damping effect, the elastic leather bag 2 needs to be ensured to be in a working vibration-damping state, that is, the pressure of the second air cavity 402 needs to be equal to the hydraulic pressure, so that the internal pressure and the external pressure of the elastic leather bag 2 are balanced, and the internal pressure and the external pressure of the vibration damper 11 are adjusted by the pressure-regulating piston 3.
Let V 1 The maximum volume of the second air cavity 402, the variable air cavity volume of the pressure regulating device 12 is V 1 (ii) a Let V 2 The volume of the first air chamber 401 with the bladder 2 of the absorber 11 in a neutral equilibrium position; at a temperature T 0 Under the condition, the air chamber 4 of the vibration damping device is pre-inflated, and the inflation pressure is P 0 (ii) a The maximum total volume of the air chamber 4 is V max The minimum total volume of the air chamber 4 is V min 。
Ignoring the volume of the connecting portion gas chamber 4:
V max ＝V 1 +V 2 (1)
V min ＝V 1 (2)
according to an ideal gas state equation, the following can be obtained:
P 0 V max ＝nRT 0 (3)
the total volume of the air chamber 4 can be V max To V min Varies within a range, and therefore at an initial pressure P 0 Under the condition, the pressure when the total volume of the air chamber 4 is minimum is set as P 1 From the ideal gas equation, one can obtain:
P 1 V min ＝nRT 0 (4)
this gives:
Figure BDA0003587720980000061
if the bottom area of the piston 3 is S and the maximum displacement of the piston 3 is X, then
V 1 ＝SX (6)
From this it can be derived that the displacement x of the piston 3 corresponds to the working pressure P one to one, since the pressure in the chamber 4 can be derived at P 0 To P 1 The pressure of the air chamber 4 and the pressure of the liquid chamber 5 are kept balanced during the working process, so the invention can realize the pressure P of the system 0 To P 1 Damping of variable pressure systems, i.e. operating pressure P of the invention at P 0 To P 1 Has better vibration elimination effect in between. Meanwhile, from the ideal gas equation, it can be seen that T is the characteristic of the variable pressure of the invention 0 The characteristic that the adaptive system pressure is changeable is not influenced, so that the invention can simultaneously meet the vibration absorption effect in a wide temperature range.
It is only used to prove the effectiveness of the invention, and does not mean that the invention is only applicable to the system shown as follows: the AMESim is adopted to carry out simulation experiments by adopting a simulation interface data model in the embodiment 1, the initial mean pressure of the system is 50bar, the inflation pressure of the vibration absorption device is 10bar, the original pulsation of the system consists of 300Hz,600Hz and 900Hz pulsations, the data of the pressure response curve of the pump outlet of the pump source of the original hydraulic system and the pump outlet of the vibration absorption device are analyzed, the time domain simulation result is shown in figures 3-4, the frequency domain simulation result is shown in figure 5, and the time domain and frequency domain simulation results show that the invention has good vibration absorption effect and higher application value and research value.
Example 2:
fig. 6 shows another preferred embodiment of the self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device, which is different from that of example 1 in that: the two ends of the leather bag 2 are supported on the shock absorber 11 and are in a cylindrical structure.
Preferably, the vibration absorber 11 includes a first housing 111, an air cavity joint 112 and a liquid cavity joint 113, the bladder 2 is located inside the first housing 111 and connected to the air cavity joint 112 and the liquid cavity joint 113, a first air cavity 401 is formed between the inside of the bladder 2 and the air cavity joint 112, a first liquid cavity 501 is formed between the outside of the bladder 2 and the first housing 111, the air cavity joint 112 is provided with a first air port 1121 communicated with the first air cavity 401, and the liquid cavity joint 113 is provided with a first oil port 1131 and a plurality of oil through holes 1132 communicated with the first oil port 1131 and the first liquid cavity 501.
Preferably, a casing nut 114 is connected to the first housing 111, the air chamber joint 112 is in limit fit with the first housing 111 and the casing nut 114, and the liquid chamber joint 113 is in threaded fit with the first housing 111.
Preferably, the air cavity joint 112 and the first housing 111 are both provided with a first sealing groove 115, and the housing nut 114 and the liquid cavity joint 113 are both provided with a first sealing boss 116 which is matched with the sealing groove, so as to increase the sealing performance of the absorber 11 after connection.
Preferably, two ends of the leather bag 2 are respectively provided with a flange 201 connected with the air cavity joint 112 or the liquid cavity joint 113.
Preferably, the vibration absorber 11 can be independently applied to a constant pressure system, the first air cavity 401 is connected with an air supplement device, and the first liquid cavity 501 is connected with a hydraulic system.
Preferably, one of the first air cavity 401 and the first liquid cavity 501 is used for flowing a first fluid and the other is used for flowing a second fluid, and the first air cavity and the second liquid cavity are not limited to the air flowing in the leather bag 2 and the liquid flowing outside the leather bag 2.
The assembling process of the vibration absorber 11 in the vibration absorber device is as follows: the two ends of the leather bag 2 are respectively embedded into the connecting flange discs 201, the flange disc 201 at one end of the leather bag 2 is detachably connected with the air cavity joint 112 through a first bolt 117, so that a first air cavity 401 is formed between the leather bag 2 and the air cavity joint 112, and a first air port 1121 is communicated with the first air cavity 401 and is used for connecting a second air cavity 402; placing the leather bag 2 in the first shell 111, limiting the air cavity joint 112 and the first shell 111, sleeving the outer nut 114 outside the air cavity joint 112 and detachably connecting the outer nut with one end of the first shell 111 through thread fit, and realizing the limiting installation of the air cavity joint 112;
the leather bag 2 has tensile elasticity, can dismantle the connection sap cavity joint 113 with the ring flange 201 of the leather bag 2 other end through second bolt 118, connect back leather bag 2 elastic recovery, can dismantle the connection with the sap cavity joint 113 through third bolt 119 and the first casing 111 other end, third bolt 119 and fluid through-hole 1132 abdicate the setting, realize the installation of sap cavity joint 113, make 2 both ends of leather bag support on the vibration absorber 11 and be the tubular structure, form first sap cavity 501 between the outer and first casing 111 of leather bag 2, by first hydraulic fluid port 1131 through a plurality of fluid through-holes 1132 evenly with first sap cavity 501 circulation hydraulic oil, can dismantle the connection, be convenient for installation, change and maintenance, reliably support the work wall of leather bag 2, guarantee that leather bag 2 changes liquid chamber 5 along with the pressure differential breathing motion of liquid chamber 5 and gas chamber 4, gas chamber 4 volume.
Example 3:
fig. 7 shows another preferred embodiment of the self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device, which is different from embodiment 1 or embodiment 2 in that: the pressure regulating device 12 includes a second housing 121 and a housing joint 122 connected to the second housing 121, the piston 3 is located in the second housing 121 and is in sliding fit with the second housing 121, a second air chamber 402 is formed between one end of the piston 3 and the second housing 121, a second liquid chamber 502 is formed between the other end of the piston 3 and the second housing 121, a second air port 1211 communicated with the second air chamber 402 is arranged on the second housing 121, and a second oil port 1221 communicated with the second liquid chamber 502 is arranged on the housing joint 122.
Preferably, the piston 3 is in sliding fit with the housing 1, a plurality of first sealing rings 301 are arranged between the piston 3 and the housing 1, and the sealing performance between the piston 3 and the second housing 121 is improved by the first sealing rings 301.
Preferably, a second sealing groove 1212 is provided on the second housing 121, and a second sealing boss 1222 matched with the second sealing groove 1212 is provided on the housing, so as to increase the sealing performance after the pressure regulating device 12 is connected.
The assembling process of the pressure regulating device 12 in the vibration damping device is as follows: the sealing ring is arranged on the piston 3, the outer wall of the piston 3 is arranged in the second shell 121 in a sliding fit manner with the pressure regulating device 12, the second shell 121 and the shell joint 122 are detachably connected through the fourth bolt 123 to realize the installation and connection of the piston 3, the first oil port 1131 and the second oil port 1221 are used for connecting a hydraulic system, and the first air port 1121 and the second air port 1211 are used for communicating the first air cavity 401, the second air cavity 402 and the air supplementing device 7.
Example 4:
fig. 8 shows another preferred embodiment of the self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device, which is different from embodiment 1 in that: the leather bag 2 and the piston 3 are combined into an integrated structure.
Preferably, the piston 3 is in sliding fit with the housing 1, a plurality of second sealing rings 302 are arranged between the piston 3 and the housing 1, the leather bag 2 is embedded in the center of the piston 3, so that a liquid chamber 5 and a gas chamber 4 with variable volumes are formed in the housing 1 through the leather bag 2 and the piston 3 in an isolation mode, the liquid chamber 5 and the gas chamber 4 are respectively connected with the gas supplementing device 7 and the hydraulic system, the gas chamber 4 is precharged to a certain pressure, after the hydraulic system is started, the gas-oil pressure is balanced through the movement of the piston 3 in the housing 1, the gasoline pressure balance refers to the balance on the mean value after the pulsation is removed, the pressure pulsation is reduced through the expansion and contraction throughput pulsation of the leather bag 2, and a good vibration eliminating effect can be obtained under the same principle.
In summary, the present device has the following effects:
(1) aiming at a closed hydraulic system, because a hydraulic pump has periodic pressure pulsation and the pressure mean value changes in a large range, the hydraulic system is adaptive to a system vibration damping structure based on the volumes of a variable liquid chamber 5 and a variable gas chamber 4, the pre-charging pressure in the gas chamber, the liquid chamber is communicated with a hydraulic system pipeline, the oil pressure is changed after the hydraulic system is started, the piston 3 moves along with the pressure difference between the liquid chamber 5 and the gas chamber 4, high-frequency pulsation needing vibration damping is filtered, the reaction is only generated on the low-frequency pressure pulsation, the pressure of the gas chamber is ensured to be equal to the system mean value pressure to realize self-pressure regulation, the pressure of the gas chamber 4 is regulated through the piston 3 to ensure that a leather bag 2 in the vibration damping device has elasticity all the time, the leather bag 2 contracts and expands along with the pressure difference between the liquid chamber 5 and the gas chamber 4 to change the volumes of the liquid chamber 5 and the gas chamber 4, and absorbs the pressure pulsation in the hydraulic system pipeline to realize the suppression of fluid pulsation, so that the vibration damping device can keep good vibration damping effect all the different system pressures all the time, the gas-liquid coupling improves the system vibration damping reliability, particularly improves the application effect on a variable pressure system, and is suitable for the hydraulic system with the large-range change of the pressure.
(2) Through leather bag 2 and piston 3 keep apart variable volume's liquid chamber 5 and air chamber 4, form parallelly connected gas-liquid coupling formula damping device, can adapt to the atmospheric pressure change that leads to by temperature change, piston 3 can remove in order to offset the pressure variation that leads to by the temperature after the atmospheric pressure change, solve the problem that the damping effect is influenced by the temperature, under the variable pressure operating mode condition that adapts to variable pressure system, realize the damping effect under the wide temperature range, also be applicable to the system damping that constant voltage system and temperature transformation range are big simultaneously.
(3) The problems that gas sealing is difficult, the vibration absorption effect is influenced by temperature and the like in the design and use of the parallel gas-liquid coupling type vibration absorption device are solved by adding the automatic gas supplementing device 7, the design difficulty of gas tightness is reduced, maintainability is further increased, and the vibration absorption device can be used in a more diversified scene.
(4) Through the specific structural improvement on the vibration absorber 11, the pressure regulating device 12 or the vibration absorption device, the assembly, the disassembly and the maintenance are convenient, so that ideal pressure pulsation attenuation is obtained, the vibration absorption requirement matching design of a corresponding system is adapted, and the specific number, the shape and the size of the corresponding vibration absorber 11, the pressure regulating device 12 or the shell 1 are not limited.
The device has the characteristics that the gas chamber pressure is self-regulated along with the liquid chamber pressure, and the gas-liquid coupling principle vibration reduction is realized through the gas-liquid coupling type fluid pulsation vibration absorption device with the self-pressure regulation function, so that the attenuation of the fluid pulsation under variable pressure can be realized in a wide temperature and wide frequency range, and the pressure pulsation absorption performance under the variable pressure working condition is optimized, thereby achieving the overall balanced optimal performance, reducing the damage of the pressure pulsation to the system and reducing the fluid noise of a hydraulic system.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (9)

1. The self-pressure-adjusting gas-liquid coupling type fluid pulsation vibration damping device is characterized by comprising a shell (1), a leather bag (2) and a piston (3), wherein a liquid chamber (5) and an air chamber (4) which are isolated by the leather bag (2) and the piston (3) are arranged in the shell (1), the piston (3) can move along with the pressure change of the liquid chamber (5) and adjust the pressure of the air chamber (4) so that the leather bag (2) is kept at a neutral balance position and always has elasticity, and the leather bag (2) can expand and contract between the liquid chamber (5) and the air chamber (4) to absorb the pressure pulsation of the liquid chamber (5);
the piston (3) can move between the liquid chamber (5) and the air chamber (4) to change the volumes of the liquid chamber (5) and the air chamber (4), and the leather bag (2) can expand and contract between the liquid chamber (5) and the air chamber (4) to change the volumes of the liquid chamber (5) and the air chamber (4).
2. The self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 1, wherein the housing (1) comprises a vibration absorber (11) and a pressure regulating device (12), a first air cavity (401) and a first liquid cavity (501) which are isolated by a leather bag (2) are arranged in the vibration absorber (11), a second air cavity (402) and a second liquid cavity (502) which are isolated by a piston (3) are arranged in the pressure regulating device (12), the second air cavity (402) is communicated with the first air cavity (401) to form an air cavity (4), and the second liquid cavity (502) is communicated with the first liquid cavity (501) to form a liquid chamber (5).
3. The pressure self-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 2, wherein two ends of the leather bag (2) are supported on the vibration damper (11) and are in a cylindrical structure.
4. The self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 3, wherein the vibration damper (11) comprises a first shell (111), an air cavity joint (112) and a liquid cavity joint (113), the leather bag (2) is located inside the first shell (111) and connected with the air cavity joint (112) and the liquid cavity joint (113), a first air cavity (401) is formed between the inside of the leather bag (2) and the air cavity joint (112), a first liquid cavity (501) is formed between the outside of the leather bag (2) and the first shell (111), the air cavity joint (112) is provided with a first air port (1121) communicated with the first air cavity (401), and the liquid cavity joint (113) is provided with a first oil port (1131) and a plurality of oil through holes (1132) communicated with the first oil port (1131) and the first liquid cavity (501).
5. The self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 4, wherein a casing nut (114) is connected to the first housing (111), the air cavity joint (112) is in limit fit with the first housing (111) and the casing nut (114), the liquid cavity joint (113) is in threaded fit with the first housing (111), and flanges (201) connected with the air cavity joint (112) or the liquid cavity joint (113) are respectively arranged at two ends of the leather bag (2).
6. The self-pressure-adjusting gas-liquid coupling type fluid pulsation vibration damping device is characterized in that the pressure adjusting device (12) comprises a second shell (121) and a shell (1) joint connected with the second shell (121), a piston (3) is located in the second shell (121) and is in sliding fit with the second shell (121), a second air cavity (402) is formed between one end of the piston (3) and the second shell (121), a second liquid cavity (502) is formed between the other end of the piston (3) and the second shell (121), a second air port (1211) communicated with the second air cavity (402) is formed in the second shell (121), and a second oil port (1221) communicated with the second liquid cavity (502) is formed in the shell (1) joint.
7. The self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 1, wherein the leather bag (2) and the piston (3) are combined into an integrated structure.
8. A self-pressure-regulating gas-liquid coupled fluid pulsation vibration damping device according to any one of claims 1 to 7, wherein the gas chamber (4) is connected with a gas supplementing device (7).
9. The self-pressure-regulating gas-liquid coupling type fluid pulsation vibration damping device according to claim 8, wherein the air chamber (4) is connected with an air pressure sensor (701), the air supply device (7) comprises an air source (702) communicated with the air chamber (4) and a controller (703) connected with the air pressure sensor (701), and the controller (703) is used for setting a threshold value and controlling the opening and closing of a communication channel between the air source (702) and the air chamber (4) according to a comparison result of feedback data of the threshold value and the air pressure sensor (701).
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