Hydraulic pipeline fluid pulsation attenuation device based on mechanical antenna active filtering

Abstract

The invention discloses a hydraulic pipeline fluid pulsation attenuation device using a mechanical antenna for active filtering, which comprises a wire connection sealing device, the mechanical antenna, a quick-plug connection sealing device and a virtual HQ pipe which are sequentially arranged along a preset direction, wherein the wire connection sealing device is used for connecting liquid metal filled in the mechanical antenna; the ampere-fold force is changed by changing the current, so that the resonant frequency of the mechanical antenna is adjusted, and the purpose of introducing a secondary active pulsation source is achieved; the mechanical antenna comprises a polyether polyurethane sheet and liquid metal and is used for converting electric energy provided by the power supply into mechanical energy through a magnetic field where the cavity is located; the quick-plug connection sealing device part is used for transmitting source pulsation waves from fluid pulsation of the hydraulic pipeline to the virtual HQ pipe; the virtual HQ pipe part is used for carrying out primary passive filtering on source pulsation waves from fluid pulsation of the hydraulic pipeline. Through introduction of the mechanical antenna part, the purpose of introduction of a secondary active pulsation source in the hydraulic pulsation attenuator can be achieved, then active filtering is carried out, the virtual HQ tube part serves as an acoustic metamaterial of an integrated HQ tube, a multi-stage Helmholtz and an expansion chamber, and broadband passive filtering can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pipeline fluid vibration reduction and noise reduction control, specifically to a hydraulic pipeline fluid pulsation attenuation device that uses a mechanical antenna for active filtering and a virtual HQ pipe for passive filtering. Background Art

[0002] Magnetoelectric composite mechanical antennas have been widely used in underwater, underground communication, navigation and positioning and other fields due to their advantages such as small size, low power consumption, simple equipment, and good environmental adaptability, and have become a research hotspot in related fields at home and abroad. When a mechanical antenna is combined with piezoresistive damping technology, the conversion of electrical energy into mechanical energy can be achieved.

[0003] Hydraulic technology has been widely used in many technical fields such as construction machinery, agricultural machinery, shipbuilding industry and national defense industry. At present, hydraulic technology is developing towards high pressure, high speed and high power. However, the vibration and noise caused by pulsating fluid in the hydraulic system have become one of the important factors hindering the progress of hydraulic technology. Pressure pulsation is usually considered to be the main source of vibration and noise in hydraulic systems. The flow pulsation determined by the oil discharge mechanism of positive displacement hydraulic pumps forms pressure pulsation after encountering the system load impedance and propagates along the pipeline, causing vibration of the pipeline system and generating noise, affecting the working performance of the system, shortening the service life of components, and even causing safety accidents in severe cases. In order to reduce the noise caused by hydraulic system pulsation, a large number of studies have been carried out by predecessors. Installing a hydraulic pulsation attenuator to reduce pulsation is a main approach. With the development of hydraulic systems towards high pressure, large flow and high power, many disadvantages have also emerged in the passive control of hydraulic system pulsation. For example: (1) In actual hydraulic systems, due to the complexity of the system, such as uncertain factors such as nonlinearity and distributed parameters, the system is extremely vulnerable to external interference. Traditional pulsation attenuators are often passive, and once their structural parameters are determined, they cannot be easily changed, which results in the singularity of pulsation attenuators and also increases the cost of using pulsation attenuators. (2) Generally, pulsation energy is mainly concentrated in the frequency range below 200 Hz. For the attenuation of such low frequencies, traditional pulsation attenuators are unable to cope effectively. The industry urgently needs a new type of pulsation attenuator to break this situation. Summary of the Invention

[0004] Aiming at the technical status quo that the existing hydraulic pulsation attenuator technology is difficult to cope with application scenarios with various types and wide frequency bands, the present invention proposes a hydraulic pipeline fluid pulsation attenuation device that uses a mechanical antenna for active filtering, so as to more flexibly and accurately adjust the filtering frequency corresponding to the attenuator to develop the applicable technology of active filtering for hydraulic pulsation attenuators.

[0005] To achieve the above object, in a first aspect, the present invention provides a hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna, including a wire connection sealing device, a mechanical antenna, a quick plug-in connection sealing device, and a virtual HQ tube device arranged in sequence along a preset direction;

[0006] The wire connection sealing device is used to supply current to the mechanical antenna, so that under the action of a magnetic field, the Ampere force borne by the mechanical antenna is changed, the vibration displacement of the mechanical antenna is changed, the spring coefficient is changed, and thus the resonance frequency of the mechanical antenna is adjusted;

[0007] The mechanical antenna includes a polyether type polyurethane thin plate and liquid metal, and is used to convert the electrical energy provided by the power supply into mechanical energy through the magnetic field where the chamber is located;

[0008] The quick plug-in connection sealing device is used to conduct the source pulsation wave from the fluid pulsation of the hydraulic pipeline to the virtual HQ tube;

[0009] The virtual HQ tube is used to perform a first passive filtering on the source pulsation wave from the fluid pulsation of the hydraulic pipeline.

[0010] In a second aspect, the present invention provides a passive attenuator virtual HQ tube for broadband attenuation;

[0011] The virtual HQ tube includes a multi-stage Helmholtz pulsation attenuator and a side-mounted expansion chamber pulsation attenuator, and is used to passively attenuate the pulsation frequency of a fixed frequency band;

[0012] In a third aspect, the present invention provides a method for changing the frequency of the introduced secondary aortic pulsation source. By placing the hydraulic pulsation attenuator designed by the present invention under a magnetic field constructed by a permanent magnet, the spring coefficient of the mechanical antenna is affected by controlling the magnitude of the current passing through the wire connection sealing device, and then the resonance frequency of the mechanical antenna is adjusted, so as to introduce secondary aortic pulsation sources of different frequencies.

[0013] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0014] (1) The present invention proposes a hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna. By introducing the mechanical antenna, the purpose of generating a secondary aortic pulsation source inside the attenuator can be achieved. The secondary aortic pulsation source can interfere with the source pulsation generated by the hydraulic pipeline and the hydraulic pump, so that the resonance frequency of the attenuator can be adjusted more flexibly and accurately, and the applicable range of the attenuator can be expanded.

[0015] (2) The present invention proposes a method for adjusting the attenuation frequency of a hydraulic pipeline fluid pulsation attenuation device that includes an active filtering mechanical antenna. By changing the magnitude of the current passing through the sealing device connected by wires, the elastic coefficient of the mechanical antenna is affected, thereby adjusting the resonant frequency of the mechanical antenna, and by changing the mass of the mechanical antenna support to adjust the resonant frequency of the mechanical antenna, so that the attenuation frequency of the hydraulic pulsation attenuator can be adjusted more flexibly and precisely, and the applicable range of the hydraulic pulsation attenuator can be expanded. Description of the Drawings Figure 1 It is a longitudinal sectional view of the mechanical part of a hydraulic pipeline fluid pulsation attenuation device with an active filtering mechanical antenna according to the present invention. Figure 2 It is a top view schematic diagram of the virtual HQ pipe Figure 3 It is a schematic diagram of the liquid metal filling groove of the mechanical antenna. Figure 4 It is a schematic diagram of the circuit for intelligently regulating the magnitude of the current. Figure 5 It is a schematic diagram of the principle of the main and passive integrated control system for the hydraulic pipeline fluid pulsation in the embodiment of the present invention.

Claims

1. A hydraulic pipeline fluid pulsation attenuation device using a mechanical antenna for active filtering, characterized in that , including a wire connection sealing device, a mechanical antenna, a quick plug - and - play connection sealing device, and a virtual HQ tube device arranged in sequence along a preset direction; The wire connection sealing device is used to supply current to the mechanical antenna, so that under the influence of a magnetic field, the Ampere force borne by the mechanical antenna is changed, thereby adjusting the resonant frequency of the mechanical antenna; The mechanical antenna includes a polyether - type polyurethane thin plate and liquid metal, and is used to convert the electrical energy provided by the power supply into mechanical energy through the magnetic field where the chamber is located; The quick plug - and - play connection sealing device is used to conduct the source pulsation wave from the fluid pulsation of the hydraulic pipeline to the virtual HQ tube; The virtual HQ tube is used to perform a primary passive filtering on the source pulsation wave from the fluid pulsation of the hydraulic pipeline.

2. The hydraulic pipeline fluid pulsation attenuation device for active filtering of the mechanical antenna according to claim 1, characterized in that , at one end of the mechanical antenna, an inlet end - cover part (5) is arranged. Its main function is to fix the mechanical antenna (6) and provide a liquid - metal injection channel, facilitating the input of current controlled from the outside; The mechanical antenna part (6) is composed of two pieces of polyether - type polyurethane elastomers with pressure resistance, high temperature resistance, and corrosion resistance and their brackets. Groove circuits capable of filling liquid metal are opened in the elastomers. After being connected to an external power supply through the inlet end - cover part (5), the resonant frequency of the mechanical antenna can be adjusted by changing the magnitude of the internal current.

3. A hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna according to claim 1 or 2, characterized in that , at the other end of the mechanical antenna part opposite to the inlet end - cover part, a pipe - taper straight - through pipe joint (7) is closely arranged: The pipe - taper straight - through pipe joint is used to connect the inlet pipeline and also to seal the entire cavity.

4. A hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna. Above the mechanical antenna part, a cavity (1) with through - holes is closely arranged: The SM quick - change joint (3) is used to connect the quick - screw internal - thread straight - through pipe joint (2) and also takes into account the sealed connection of the pipeline.

5. A hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna according to claim 3 or 4, characterized in that , above the quick - screw internal - thread straight - through pipe joint (2), a virtual HQ tube (1) is connected: The virtual HQ tube is welded by aluminum alloy plates and constitutes an acoustic metamaterial integrating HQ tubes, multi - stage Helmholtz, and expansion chambers, which can achieve wide - band passive filtering of the source pulsation.

6. A hydraulic pipeline fluid pulsation attenuation device for active filtering of a mechanical antenna. To the left of the wire connection sealing device part, a high - strength bolt (9) is closely arranged: The high - strength bolt (9) is used to connect the pipe - taper straight - through pipe joint (7), the cavity (1), the inlet end - cover part (5), and the outlet end - cover part (8), and also takes into account the sealing performance of the entire attenuator.

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