Adaptive liquid pipeline noise elimination system and method based on jet flow rectification and noise elimination

Abstract

The present invention discloses an adaptive liquid pipeline noise elimination system and method based on jet rectification and noise elimination. The system includes a muffler housing, at least one jet disk disposed inside the muffler housing, a flow meter disposed inside the pipeline behind the pump, a muffler controller communicatively connected to the pump and the flow meter respectively, and a pressurized liquid return assembly disposed on the outlet side of the muffler housing and communicating with the jet disk for pressurizing and returning the liquid at the outlet of the muffler and spraying it out from the jet disk. The jet disk is provided with jet nozzles. By repeatedly sucking a part of the liquid at the outlet of the muffler through the pressurized liquid return assembly, pressurizing it and spraying it out through the jet nozzles, large vortices generated upstream of the pump are dispersed and broken into small vortices, and finally the small vortices are rectified into laminar flow through multiple jet disks, so as to reduce the liquid pressure pulsation. By collecting the rotational speed signal and flow signal of the pump through the muffler controller and controlling the jet speed and flow rate of the jet disk, the adaptive adjustment of the noise elimination effect of the liquid pipeline is realized, and the noise elimination effect is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline noise elimination, and more specifically, relates to an adaptive liquid pipeline noise elimination system and method based on jet rectification noise elimination. Background Art

[0002] In a pipeline system, especially for a ship liquid pipeline system including a circulating water pipeline, a domestic water pipeline, and a sea connection pipeline system, etc., the fluid noise in the pipeline, as one of the main noises of the ship, will seriously damage the stealth and reliability of the whole ship. In the chemical industry, excessive pipeline pressure pulsation will not only generate vibration noise but also affect the structural safety.

[0003] According to the flow form, the state of the fluid during the flow process can be divided into two types: laminar flow and turbulent flow. Laminar flow refers to the state where, during a certain section of the flow process, each particle of the fluid moves completely along the pipe axis direction in a straight line and the particles do not interfere with each other and there is no mixing; turbulent flow refers to the state where the fluid does not move completely in a straight line along the pipe axis direction during the movement process, but also has a transverse movement, the particles affect each other, and the streamlines are chaotic, which is called turbulent flow. The size of the vortex is generally represented by vorticity, and the size of the vorticity is proportional to the square value of the frequency, which means that an increase in frequency will lead to a significant increase in vorticity, thereby enhancing the rotational effect of the fluid.

[0004] The noise of the fluid in the pipeline mainly comes from valves and pumps. Due to the periodic operation characteristics of the pump, the output fluid has more and larger eddies, thereby generating fluid pulsation noise; in addition, when the pump runs at high speed, the internal mechanical components collide, rub, and vibrate, which will also generate corresponding eddies in the fluid. Generally, the pressure pulsation noise level generated by the eddies in the outlet pipe section of the pump can reach 180 dB, mainly concentrated near the pump frequency. Valve noise is mainly caused by the mechanical vibration and fluid pulsation generated during the opening and closing process of the valve; in addition, when the valve opening is small, the fluid in the pipe throttles, resulting in a large number of vortices in the downstream fluid, that is, turbulent flow is formed, and these turbulent vortices will also propagate upstream. When the rotational speed changes or the valve opening changes, the main frequency of the pressure pulsation will shift significantly, resulting in a decrease in the noise elimination effect of the muffler matching the rated working condition. If these high-intensity pressure pulsations are not processed, they will generate relatively large fluid noise, seriously affecting the acoustic stealth performance of the ship and the structural safety of the chemical pipeline. Research shows that the closer the liquid in the inlet pipeline of the pump or valve is to laminar flow, the lower the liquid pulsation pressure level downstream of the pump or valve. Therefore, setting a rectifying device at the inlet of the pump or valve is also of great significance for vibration reduction and noise elimination; this is also the reason why a liquid pipeline muffler is set at the inlet of the pump or valve in a system with higher requirements for rectifying noise elimination.

[0005] Currently, the main method to reduce the fluid noise in pipelines is to install liquid pipeline mufflers. Common liquid pipeline mufflers mainly include perforated pipe mufflers and airbag mufflers. Among them, the perforated pipe muffler is large in volume, small in noise reduction amount, and the perforated pipe has a certain risk of blockage, and there is a relatively serious attenuation of acoustic performance during use. Although the airbag muffler has a large noise reduction amount, its pressure loss is high, the structure is complex, the cost is high, and it is difficult to use and maintain. In addition, both of these mufflers require a certain expansion ratio to increase the noise reduction amount and reduce the pressure loss. And within a certain range, the larger the expansion ratio, the better the noise reduction amount and the lower the pressure loss. For ships with relatively tight dimensions, it is difficult to integrate these two mufflers. In addition, during actual operation, since the rotational speed of the pump or the opening degree of the valve will change, which will cause the change of the central frequency of the pressure pulsation to be eliminated. Under this change, the traditional muffler cannot achieve adaptive adjustment and can only sacrifice the corresponding noise reduction performance.

[0006] Therefore, there is an urgent need for a liquid pipeline muffler with a compact structure, a large noise reduction amount and a small pressure loss that can achieve adaptive adjustment. Summary of the Invention

[0007] In view of the above defects or improvement requirements of the prior art, the present invention provides an adaptive liquid pipeline noise reduction system and method based on jet rectification noise reduction. A part of the liquid at the outlet of the muffler is sucked out by a high-pressure pump, pressurized and then sprayed out through a jet nozzle, so as to disperse and break the large vortices generated upstream of the pump into small vortices, and at the same time convert the low-frequency pressure pulsation to be reduced into medium and high frequencies that are easier to eliminate. By adopting a multi-stage disk jet, after repeated rectification by the jet disk, the small vortices are finally rectified into laminar flow, and the low-frequency large-size pressure pulsation is converted into high-frequency small-size pressure pulsation, making the pressure pulsation easier to attenuate along with the pipeline, and realizing the reduction of the liquid pressure pulsation level; through a large number of experimental tests on the product prototype, a database of jet velocity, flow rate and noise reduction effect is established and written into the muffler controller. The muffler controller collects the pump speed signal and the flow rate signal and outputs a control signal to control the rotational speed of the high-pressure pump or the opening degree of the valve, so as to adjust the jet velocity and flow rate, improve the adaptive ability of the muffler, and ensure the noise reduction effect; the overall structure is compact, the noise reduction amount is large and the pressure loss is small, and the adaptive adjustment of the liquid pipeline noise reduction effect can be realized.

[0008] To achieve the above object, an aspect of the present invention provides an adaptive liquid pipeline noise elimination system based on jet rectification and noise elimination, including: a muffler housing 300 provided in the pipeline where the pump is located, a pipeline behind the pump provided on the side of the muffler housing away from the pump, at least one jet disk arranged in parallel and spaced inside the muffler housing, a flow meter arranged inside the pipeline behind the pump, a muffler controller communicatively connected to the pump and the flow meter respectively, and a pressurized liquid return assembly provided on the outlet side of the muffler housing and communicating with the jet disk for pressurizing and returning the liquid at the muffler outlet and spraying it out from the jet disk;

[0009] The jet disk is provided with jet nozzles communicating with the pressurized liquid return assembly. Part of the liquid at the muffler outlet is sucked out through the pressurized liquid return assembly, pressurized and then sprayed out through the jet nozzles, so as to disperse the vortices generated upstream of the pump. After repeatedly passing through the jet disk for rectification, the dispersed vortices are finally rectified into laminar flow, realizing the reduction of liquid pressure pulsation;

[0010] The muffler controller collects the rotational speed signal of the pump and the flow signal of the flow meter, controls the pressurized liquid return assembly to adjust the jet speed and flow rate of the jet disk, thereby realizing the adaptive adjustment of the liquid pipeline noise elimination effect and ensuring the noise elimination effect.

[0011] Further, the jet disk is a hollow tubular structure, one end away from the connecting liquid outlet pipe is closed, and a plurality of jet nozzles are distributed on the middle pipe wall.

[0012] Further, the pressurized liquid return assembly includes a liquid inlet pipe, a high-pressure pump, and a liquid outlet pipe; the muffler controller is connected to the high-pressure pump; an electric control valve for controlling the liquid outlet flow rate of the jet disk is provided between the liquid outlet pipe and the jet disk;

[0013] The liquid inlet pipe is connected to the outlet side surface of the muffler housing;

[0014] The high-pressure pump is arranged between the liquid outlet pipe and the liquid inlet pipe;

[0015] The inlet of the high-pressure pump is located in the muffler outlet section;

[0016] The liquid outlet pipe is connected to the jet disk;

[0017] The muffler controller collects the rotational speed signal of the pump and the flow signal of the flow meter, controls the rotational speed of the high-pressure pump on the pressurized liquid return assembly and the opening degree of the electric control valve of the liquid outlet pipe, and finally controls the jet speed and flow rate of the jet disk, thereby realizing the adaptive adjustment of the liquid pipeline noise elimination effect.

[0018] Further, the pressurized liquid return assembly further includes a filter provided at the inlet end or the outlet end of the high-pressure pump.

[0019] Further, the jet disk is spiral or multi-ring type;

[0020] The jet disk is planar or three-dimensional tower type.

[0021] Further, when multiple jet disks are used, the center distance between two adjacent jet disks is greater than or equal to the length of the jet core region of the jet nozzle.

[0022] The second aspect of the present invention provides an adaptive liquid pipeline noise reduction method based on jet rectification and noise elimination, which is realized by applying the adaptive liquid pipeline noise reduction system based on jet rectification and noise elimination, and includes the following steps:

[0023] S100: Install an adaptive liquid pipeline noise reduction system based on jet rectification and noise elimination in the liquid pipeline;

[0024] S200: The fluid forms a first vortex after passing through the pump from the pipeline before the pump;

[0025] S300: The high-pressure pump sucks the liquid filtered by the filter from the pipeline after the muffler and then flows back into the interior of the jet disk and is ejected through the jet nozzle, forming a majority of jets with a grid-shaped fluid boundary;

[0026] S400: The majority of jets with the grid-shaped fluid boundary are mixed with the first vortex entering the muffler housing, and the first vortex is dispersed into a second vortex to complete the preliminary rectification;

[0027] S500: The fluid after the preliminary rectification is conveyed through the jet disk again to form multiple jets with a grid-shaped fluid boundary again, and steps S300 - S400 are repeated to gradually rectify the second vortex into a laminar flow, realizing the attenuation and even elimination of the fluid pressure pulsation.

[0028] Further, step S300 further includes: collecting the rotational speed signal of the pump and the flow signal of the flowmeter in the liquid pipeline through the muffler controller, controlling the rotational speed of the high-pressure pump on the pressurized liquid return assembly and the opening degree of the electric control valve of the liquid outlet pipe, and finally controlling the jet velocity and flow rate of the jet disk to realize the adaptive adjustment of the noise reduction effect of the liquid pipeline.

[0029] The third aspect of the present invention provides a design method for an adaptive liquid pipeline noise reduction system based on jet rectification and noise elimination, which is characterized in that it is used to design the noise reduction system, and includes the following steps:

[0030] S1: Determine the required noise reduction amount, pressure loss, and the allowable outer dimensions of the muffler;

[0031] S2: Initially select the size, quantity, and flow velocity of the jet nozzle according to the required noise reduction amount, pressure loss, and the allowable outer dimensions of the muffler, so that the self-noise generated by the jet nozzle is more than 10 dB lower than the noise reduction target;

[0032] S3: Determine the required number of jet discs and the spacing between each jet disc according to the noise reduction target, so as to achieve the virtual segmentation and rectification of the fluid in the jet area;

[0033] S4: Select the size of the muffler housing according to the specifications and spacing of the jet discs;

[0034] S5: Calculate the total flow rate of the high-pressure pump, and select the model of the high-pressure pump according to the total flow rate of the high-pressure pump and the pressure difference between the jet nozzle and the liquid pipeline, so as to meet the requirements of liquid pressurization and recirculation;

[0035] S6: Use fluid simulation software to predict the noise reduction effect, pressure loss and potential core range of a single jet disc; According to the noise reduction effect, pressure loss and potential core range of a single jet disc, calculate the difference between the pressure loss generated by the muffler housing due to the jet disc and the positive fluid pressure brought by the high-pressure pump, and ensure that the pressure loss difference meets the design requirements;

[0036] S7: Through a large number of experimental tests on the product prototype, establish a database of the jet velocity, flow rate and noise reduction effect of the jet nozzle, and write it into the muffler controller. Control the jet velocity and flow rate of the jet disc through the muffler controller to achieve adaptive adjustment of parameters and adaptive adjustment of the noise reduction effect of the liquid pipeline.

[0037] Further, in step S6, if the pressure loss difference meets the requirements, check whether the insertion loss also meets the requirements. Otherwise, it is necessary to repeat steps S2-S5 to re-determine the size, number and flow velocity of the jet nozzle (501) until the design target is achieved.

[0038] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0039] (1) In the adaptive liquid pipeline noise reduction system and method based on jet rectification and noise reduction of the present invention, part of the liquid at the outlet of the muffler is sucked out by a high-pressure pump, pressurized and then sprayed out through the jet nozzle of the jet disc, so as to disperse and break the large vortices generated upstream of the pump into small vortices. At the same time, the low-frequency pressure pulsation to be reduced is converted into medium and high frequencies that are easier to eliminate. Through the use of multi-stage disc jets and repeated rectification by the jet discs, the small vortices are finally rectified into laminar flow, and the low-frequency large-size pressure pulsation is converted into high-frequency small-size pressure pulsation, making the pressure pulsation easier to attenuate along the pipeline, and achieving a reduction in the liquid pressure pulsation level; It also collects the pump speed signal and the flow signal of the liquid pipeline as inputs, outputs a control signal through the muffler controller, and controls the speed of the high-pressure pump or the opening of the valve, thereby adjusting the jet velocity and flow rate of the jet disc, so as to improve the adaptive ability of the muffler and ensure the noise reduction effect.

[0040] (2) The adaptive liquid pipeline silencing system based on jet rectification and silencing of the present invention has the characteristics of small pressure loss and has little impact on the upstream pump or valve. By increasing the pressure difference between the high-pressure pump and the pipeline liquid and the flow rate of the high-pressure pump, zero pressure loss or even negative pressure loss can be achieved, which cannot be achieved by other existing types of silencers or silencing modules; the liquid pipeline silencer of the present invention divides large-scale vortices by introducing multiple relatively low-noise jet beams into smaller vortices and forms a virtual fluid boundary, avoiding the collision of large liquid flow vortices with the shell and achieving the purpose of pipeline vibration reduction and noise reduction; by inhaling the rectified and silenced laminar fluid, the self-noise of the nozzle is relatively low, so that the ability to reduce the fluid pressure pulsation level can be improved by increasing the jet pressure ratio and the jet velocity; by collecting the pump speed and flowmeter signals of the pipeline to be controlled and controlling the jet velocity and flow rate in real time, adaptive adjustment can be achieved; by selectively installing filters or backwashing measures before and after the high-pressure pump, jet nozzle blockage can be avoided, ensuring that the silencing effect does not decrease with the increase of use time. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of an adaptive liquid pipeline silencing system based on jet rectification and silencing according to an embodiment of the present invention;

[0042] Figure 2 It is a schematic structural diagram of a jet disk inside a silencer housing of an adaptive liquid pipeline silencing system based on jet rectification and silencing according to an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of jet velocities in different regions of an adaptive liquid pipeline silencing system based on jet rectification and silencing according to an embodiment of the present invention;

[0044] Figure 4 It is a schematic flow diagram of an adaptive liquid pipeline silencing method based on jet rectification and silencing according to an embodiment of the present invention;

[0045] Figure 5 It is a schematic flow diagram of a design method of an adaptive liquid pipeline silencing system based on jet rectification and silencing according to an embodiment of the present invention.

[0046] In all the drawings, the same reference numerals denote the same technical features, specifically: 100 - pipeline before the pump, 200 - pump, 300 - muffler housing, 400 - pipeline after the pump, 500 - jet disc, 501 - jet nozzle, 600 - flowmeter, 700 - muffler controller, 800 - pressurized liquid return assembly, 801 - liquid inlet pipe, 802 - high-pressure pump, 803 - liquid outlet pipe, 804 - filter, 805 - electric control valve for the liquid outlet pipe, 101 - first vortex, 102 - second vortex, 103 - laminar flow, 301 - inlet flange, 302 - outlet flange, 502 - jet disc fixing part. Detailed implementation mode

[0047] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, when an element is referred to as "fixed to", "arranged on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the terms "first", "second",... are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0050] The existing liquid pipeline mufflers mainly include two types: perforated pipe type and airbag type. Among them, the perforated pipe type requires a large expansion ratio to achieve an ideal sound absorption effect and a small pressure loss, which is almost unacceptable for the ship pipeline system with limited space; the airbag type has the characteristics of large sound absorption, but the system structure, maintenance and repair are relatively complex, the production cost is high, the service life is short, and the pressure loss is large. The corresponding liquid pump needs to overcome its large pressure loss, resulting in an increase in rotational speed and power, thereby increasing the vibration and noise reduction index. In addition, in order to adapt to different working conditions, the rotational speed of the pump and the opening of the valve will change, resulting in a mismatch between the original designed muffler and the actual working conditions. The perforated pipe type does not have the adjustment ability, and the airbag type is difficult to adjust. Manual adjustment is often required, and it basically does not have the adaptive adjustment ability, ultimately resulting in a serious decline in the actual sound absorption effect.

[0051] For the above reasons, as Figure 1 and Figure 2 shown, one aspect of the present invention provides an adaptive liquid pipeline sound absorption system based on jet rectification sound absorption, which is installed before and after the pump or valve and is used to eliminate the pressure pulsation generated by liquid flow. Taking the installation after the pump as an example, the sound absorption system includes a pump 200 arranged in the pipeline 100 in front of the pump, a muffler housing 300 arranged behind the pump 200, a pipeline 400 behind the pump arranged on the side of the muffler housing 300 away from the pump 200, at least one jet disc 500 arranged in parallel and spaced inside the muffler housing 300, a flowmeter 600 arranged inside the pipeline 400 behind the pump, a muffler controller 700 communicatively connected to the pump 200 and the flowmeter 600 respectively, and a pressurized liquid return assembly 800 arranged on the outlet side of the muffler housing 300 and communicating with the jet disc 500 for pressurizing and returning the liquid at the outlet of the muffler and spraying it out from the jet disc 500; the muffler controller 700 is connected to the pressurized liquid return assembly 800, collects the rotational speed signal of the pump 200 and the flow signal of the flowmeter 600 through the muffler controller 700, and controls the pressurized liquid return assembly 800 to adjust the jet speed and flow rate of the final control jet disc 500, thereby realizing the adaptive adjustment of the liquid pipeline sound absorption effect; a jet nozzle 501 communicating with the pressurized liquid return assembly 800 is arranged on the jet disc 500, and part of the liquid at the outlet of the muffler is sucked out through the pressurized liquid return assembly 800, and after being pressurized, it is sprayed out through the jet nozzle 501 of the jet disc 500, so as to disperse and break up the large vortices generated upstream of the pump 200 into small vortices. After repeated rectification by the jet disc 500, the small vortices are finally rectified into a stable laminar flow liquid, that is, a laminar flow state, realizing the reduction of liquid pressure pulsation and further ensuring the sound absorption effect.

[0052] Furthermore, as Figure 1 and Figure 2As shown, the jet disk 500 is a hollow tubular structure, with one end away from the connecting liquid outlet pipe 803 being closed, and a plurality of jet nozzles 501 are distributed on the middle pipe wall; a part of the liquid at the outlet of the muffler is sucked out by the high-pressure pump 802, and after being pressurized, it is ejected through the jet nozzles 501 of the jet disk 500, so as to disperse and break up the large vortices generated upstream of the pump 200 into small vortices. After passing through the jet disk 500, the small vortices are finally rectified into a stable laminar flow liquid, that is, a laminar flow state, realizing the reduction of liquid pressure pulsation, and further ensuring the muffling effect.

[0053] Further, as Figure 1 and Figure 2 shown, the pressurized liquid return assembly 800 includes a liquid inlet pipe 801, a high-pressure pump 802, and a liquid outlet pipe 803; the muffler controller 700 is connected to the high-pressure pump 802; an outlet pipe electric control valve 805 for controlling the liquid outlet flow rate of the jet disk 500 is provided between the liquid outlet pipe 803 and the jet disk 500; the muffler controller 700 is respectively connected to the high-pressure pump 802 and the outlet pipe electric control valve 805 through control lines 701; the muffler controller 700 is respectively connected to the pump 200 and the flowmeter 600 through information acquisition lines 702; by the muffler controller 700 collecting the rotational speed signal of the pump 200 and the flow rate signal of the flowmeter 600, controlling the rotational speed of the high-pressure pump 802 on the pressurized liquid return assembly 800 and controlling the opening degree of the outlet pipe electric control valve 805, and finally controlling the jet speed and flow rate of the jet disk 500, so as to realize the adaptive adjustment of the muffling effect of the liquid pipeline;

[0054] Further, as Figure 1 and Figure 2 shown, the liquid inlet pipe 801 is connected to the outlet side of the muffler housing 300; the high-pressure pump 802 is arranged between the liquid outlet pipe 803 and the liquid inlet pipe 801; the inlet of the high-pressure pump 802 is located in the outlet section of the muffler; the liquid outlet pipe 803 is connected to the jet disk 500; the pressurized liquid return assembly 800 further includes a filter 804 arranged at the inlet end or the outlet end of the high-pressure pump 802 to prevent the jet nozzles from being blocked during long-term use; in addition, measures such as fixing and reversing the operation of the high-pressure pump 802 at regular intervals can be adopted for backwashing to avoid nozzle blockage.

[0055] Further, as Figure 1 and Figure 2As shown, the muffler housing 300 is a hollow columnar structure, with an inlet flange 301 connected to the pipeline 100 in front of the pump and an outlet flange 302 connected to the pipeline 400 behind the pump at both ends; the jet disk 500 is spiral or multi-ring-shaped, which is beneficial to dividing the fluid in the muffler housing 300 into multiple non-interfering fluid units; the jet disk 500 can be planar or three-dimensional tower-shaped (reference can be made to tower springs); when multiple jet disks 500 are used, the center distance between two adjacent jet disks 500 is greater than or equal to the jet core length of the jet nozzle 501, so as to avoid the mutual influence between multiple jet disks 500; the jet disk 500 is fixed to the inner wall of the muffler housing 300 through a jet disk fixing member 502; the present invention uses multiple jets of the jet disk to form a grid-shaped fluid boundary to rectify the upstream turbulent fluid of the pump 200, break the vortices larger than the grid scale into smaller vortices, and then use the rectified fluid to form multiple jets again after being transported by the high-pressure pump 802, and so on in a cycle to achieve the attenuation and even elimination of the fluid pressure pulsation.

[0056] Further, as Figure 3 shown, when the diameter of the jet nozzle 501 is D, the potential core length of its jet is about 8D. Within the potential core length, the jet velocity hardly attenuates. After passing through the transition zone, the jet velocity gradually attenuates, and the jet velocity rapidly attenuates after entering the turbulent zone; the present invention pressurizes the fluid through the high-pressure pump 802 and then enters the inside of the muffler jet disk 500, and uses the jet zone formed by multiple jet nozzles 501 to virtually divide and rectify the fluid entering the muffler inside the jet zone, forming multiple non-interfering fluid regions, so as to divide the large vortices upstream of the pump or valve into smaller vortices, thus avoiding the generation of relatively large secondary air sound caused by the collision of these large vortices with the pipe wall; due to the introduction of external power, the pressure loss caused by the reduction of the pipeline flow area due to the addition of the jet disk in the actual muffler is partially or completely offset by the positive pressure introduced by the increased high-pressure fluid jet, so as to achieve ultra-low pressure loss or even negative pressure loss.

[0057] The radiation noise generated by an underwater jet is the self-noise of the fluid caused by the "friction" within the fluid itself. That is, although the underwater nozzle jet also generates certain vortices, the noise level generated by these vortices is proportional to the eighth power of the flow velocity. Measured data shows that when the flow velocity of the jet reaches 15 m / s, the radiation noise level ≤ 120 dB, which is far lower than the 180 dB of a pump or a valve. When the difference between two decibel values is 10 dB or more, the two are superimposed, and the influence of the lower decibel value on the total sound level can be ignored. Therefore, the self-noise generated by the underwater jet can be completely ignored compared to the fluid noise generated by a pump or a valve. The present invention eliminates noise in the liquid pipeline by introducing an external power source and using the original working fluid; the controllable jet generated through the small holes in the jet nozzle destroys the turbulent vortices generated by throttling, thereby eliminating the pressure pulsation of the liquid; the present invention forms an active jet by pressurizing the fluid in the pipe through an external power source, based on the principle of cutting and breaking the turbulent eddy current for rectification, without involving complex active control.

[0058] The present invention sucks out a part of the liquid at the outlet of the muffler through a high-pressure pump, sprays it out through the jet nozzles of the array of jet discs after pressurization, thereby dispersing and breaking the large vortices generated upstream of the pump into small vortices, and at the same time converting the low-frequency pressure pulsation to be reduced into medium and high frequencies that are easier to eliminate. By adopting a multi-stage disc jet, after repeated rectification by the jet discs, the small vortices are finally rectified into laminar flow, and the low-frequency large-size pressure pulsation is converted into high-frequency small-size pressure pulsation, making the pressure pulsation easier to attenuate along the pipeline, and realizing the reduction of the liquid pressure pulsation level; it also uses the collected pump speed signal and the flow signal of the liquid pipeline as inputs, outputs a control signal through the muffler controller, and controls the speed of the high-pressure pump or the opening of the valve, thereby adjusting the jet speed and flow rate, so as to improve the adaptive ability of the muffler and ensure the noise reduction effect.

[0059] The adaptive liquid pipeline muffling system based on jet rectification and noise reduction of the present invention, by introducing an externally connected power source jet, when installed in front of the pump, can reduce the noise of the pump itself by straightening the incoming liquid. When installed behind the pump, it can break the large vortices formed by the pump into small vortices, thereby greatly reducing the blade frequency pulsation pressure; through multi-stage jets, the small vortices are further broken into smaller eddy currents until laminar flow, thereby greatly reducing the fluid pressure pulsation in the pipeline. Due to the introduction of an external power source, the pressure loss of the muffler of the present invention is extremely low, even negative pressure loss. By collecting the changes in the speed and flow rate of the pump in the pipeline to be controlled, the jet speed and flow rate are controlled in real time to achieve adaptive adjustment, so as to keep the noise reduction effect of the muffler always maintained at the best level.

[0060] As Figure 4 shown, the second aspect of the present invention provides an adaptive liquid pipeline muffling method based on jet rectification and noise reduction, which is implemented by applying the above-mentioned adaptive liquid pipeline muffling system based on jet rectification and noise reduction, and includes the following steps:

[0061] S100: Install an adaptive liquid pipeline silencing system based on jet rectification and noise reduction in the liquid pipeline, including the pipeline 100 before the pump, the silencer housing 300, the pipeline 400 after the pump, the jet disc 500, the flowmeter 600, the silencer controller 700, and the pressurized liquid return assembly 800;

[0062] S200: The fluid forms a first vortex 101 after passing through the pump from the pipeline 100 before the pump; the first vortex 101 is a large vortex;

[0063] S300: The high-pressure pump 802 sucks the liquid filtered by the filter 804 from the pipeline section after the silencer and then returns it into the interior of the jet disc 500 and sprays it out through the jet nozzle 501 to form a majority of jets with a grid-shaped fluid boundary;

[0064] S400: The majority of jets with the grid-shaped fluid boundary are mixed with the first vortex 101 entering the silencer housing 300, and the large-scale first vortex 101 is dispersed into smaller-scale second vortices 102, completing preliminary rectification, reducing the liquid pressure pulsation. At the same time, the low-frequency large-size pressure pulsation that is difficult to eliminate is converted into medium-high-frequency small-size pressure pulsation that is easy to eliminate;

[0065] S500: The preliminarily rectified fluid is transported through the jet disc 500 again to form multiple jets with a grid-shaped fluid boundary again, repeating steps S300 - S400, gradually rectifying the second vortex 102 into a laminar flow 103, achieving the attenuation of the fluid pressure pulsation and converting it into higher-frequency pressure pulsation that is easier to eliminate until it is eliminated.

[0066] Further, step S300 also includes: collecting the rotational speed signal of the pump 200 in the liquid pipeline and the flow signal of the flowmeter 600 through the silencer controller 700, controlling the rotational speed of the high-pressure pump 802 on the pressurized liquid return assembly 800 and the opening degree of the outlet pipe electric control valve 805, and finally controlling the jet speed and flow rate of the jet disc 500 to achieve the adaptive adjustment of the liquid pipeline silencing effect.

[0067] Further, the silencer controller 700 in step S100 realizes the adaptive adjustment of parameters by conducting a large number of experimental tests on the product prototype, establishing a database of the jet speed, flow rate of the jet nozzle, and the noise reduction effect, and then writing it into the silencer controller.

[0068] As Figure 5 shown, the third aspect of the present invention provides a design method for an adaptive liquid pipeline silencing system based on jet rectification and noise reduction, including the following steps:

[0069] S1: Determine the required noise reduction amount, pressure loss, and the allowable external dimensions of the silencer;

[0070] S2: Initially select the size, quantity, and flow velocity of the jet nozzles 501 based on the required noise reduction amount, pressure loss, and the allowable external dimensions of the muffler, such that the self-noise generated by the jet nozzles 501 is more than 10 dB lower than the noise reduction target;

[0071] S3: Determine the quantity of the jet disks 500 required and the spacing between each of the jet disks 500 according to the noise reduction target, so as to achieve virtual segmentation and rectification of the fluid within the jet region;

[0072] S4: Select the size of the muffler housing 300 based on the specifications and spacing of the jet disks 500, ensuring reasonable structural strength and spatial layout;

[0073] S5: Calculate the total flow rate of the high-pressure pump, and select the model of the high-pressure pump 802 according to the total flow rate of the high-pressure pump and the pressure difference between the jet nozzles and the liquid pipeline, so as to meet the requirements of liquid pressurization and recirculation;

[0074] S6: Use fluid simulation software to predict the noise reduction effect, pressure loss, and potential core range of a single jet disk 500; according to the noise reduction effect, pressure loss, and potential core range of a single jet disk 500, calculate the difference between the pressure loss generated by the jet disk 500 on the muffler housing 300 and the fluid positive pressure brought by the high-pressure pump 802, ensuring that the pressure loss difference meets the design requirements;

[0075] S7: Through a large number of experimental tests on the product prototype, establish a database of the jet velocity, flow rate, and noise reduction effect of the jet nozzles, and write it into the muffler controller 700. Control the jet velocity and flow rate of the jet disk 500 through the muffler controller 700 to achieve adaptive adjustment of the parameters and adaptive adjustment of the noise reduction effect of the liquid pipeline.

[0076] Further, in step S6, if the pressure loss difference meets the requirements, then check whether the insertion loss also meets the requirements; otherwise, it is necessary to repeat steps S2 - S5 to re-determine the size, quantity, and flow velocity of the jet nozzles 501 until the design target is achieved;

[0077] Further, in step S1, determining the required noise reduction amount, pressure loss, and the allowable external dimensions of the muffler includes:

[0078] Testing or simulating and calculating the magnitude of the noise source;

[0079] Determining the main frequency and noise reduction amount of the muffler, the allowable external dimensions of the muffler, and determining the allowable pressure loss of the muffler according to the magnitude of the noise source;

[0080] The flow velocity of the jet nozzles 501 described in step S1 is calculated by formula (1):

[0081] (1)

[0082] Wherein, is the pressure difference between the jet orifice and the liquid pipeline; is the liquid density; is the flow coefficient;

[0083] Self-noise of a single jet orifice is calculated by Equation (2):

[0084] (2)

[0085] where is the pressure ratio at the inlet and outlet of the nozzle; is the air temperature; is the air molecular weight; and are the temperature and molecular weight of the fluid, respectively; is the diameter of the jet orifice;

[0086] When the self-noise is more than 10 dB lower than the noise reduction target, the initial selection of the jet orifice is qualified;

[0087] Furthermore, the total flow rate of the high-pressure pump in step S4 is calculated according to the flow rate of a single jet orifice and the number of jet orifices on a single jet disk;

[0088] where the flow rate of a single jet orifice is calculated by Equation (3):

[0089] (3)

[0090] where is the diameter of a single jet orifice;

[0091] Total flow rate of the high-pressure pump is expressed by Equation (4):

[0092] (4)

[0093] where N is the number of jet orifices, which is determined according to the specifications of the jet disk.

[0094] Through the above design method, it can be ensured that the liquid pipeline muffler achieves the best performance in reducing noise and controlling pressure loss, while also ensuring the reliability and economy of the system.

[0095] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adaptive liquid pipeline silencing system based on jet rectification silencing, characterized in that: include: A muffler housing (300) provided in a pipeline where a pump (200) is located, a pump rear pipeline (400) provided on a side of the muffler housing (300) away from the pump (200), a plurality of jet disks (500) provided in parallel and spaced relation inside the muffler housing (300), a flow meter (600) provided inside the pump rear pipeline (400), a muffler controller (700) respectively connected in communication with the pump (200) and the flow meter (600), and a flow meter (600) provided on an outlet side of the muffler housing (300) and in communication with the jet disk (500). A pressurized liquid return assembly (800) for pressurizing and returning liquid at the outlet of the muffler and ejecting it from the jet disk (500); the pressurized liquid return assembly (800) comprises a liquid inlet pipe (801), a high-pressure pump (802), a liquid outlet pipe (803), and a filter (804) disposed at the inlet end of the high-pressure pump (802); the muffler controller (700) is connected to the high-pressure pump (802); an outlet pipe electric control valve (805) for controlling the liquid outlet flow rate of the jet disk (500) is disposed between the liquid outlet pipe (803) and the jet disk (500); The jet disk (500) is provided with a jet nozzle (501) which is in communication with the pressurized liquid return component (800), and the liquid at the outlet of the muffler is partially sucked out by the pressurized liquid return component (800), and is ejected through the jet nozzle (501) after being pressurized, thereby dispersing the vortex generated upstream of the pump (200), and after repeatedly passing through the jet disk (500) for rectification, the dispersed vortex is finally rectified into a laminar flow; The speed signal of the pump (200) and the flow rate signal of the flow meter (600) are collected through the muffler controller (700), and the pressurized liquid return component (800) is controlled to adjust the jet speed and flow rate of the jet disk (500).

2. The adaptive liquid pipeline silencing system based on jet rectification silencing according to claim 1 is characterized in that: The jet disk (500) is a hollow tubular structure, one end of which is away from the liquid outlet pipe (803) and is closed, and a plurality of jet nozzles (501) are distributed on the middle tube wall.

3. The adaptive liquid pipeline silencing system based on jet rectification silencing according to claim 1 is characterized in that: The liquid inlet pipe (801) is connected to the outlet side of the muffler housing (300); The high-pressure pump (802) is arranged between the liquid outlet pipe (803) and the liquid inlet pipe (801); The inlet of the high-pressure pump (802) is located at the outlet section of the muffler; The liquid outlet pipe (803) is connected to the jet disk (500).

4. An adaptive liquid pipeline silencing system based on jet rectification silencing according to any one of claims 1 to 3, characterized in that: The jet disk (500) is in a spiral shape or a multi-ring shape; The jet disk (500) is of a plane type or a three-dimensional tower type.

5. An adaptive liquid pipeline silencing system based on jet rectification silencing according to any one of claims 1 to 3, characterized in that: When a plurality of jet disks (500) are used, the center distance between two adjacent jet disks (500) is greater than or equal to the length of the jet core area of ​​the jet nozzle (501).

6. An adaptive liquid pipeline silencing method based on jet rectification silencing, characterized in that: The method is implemented by using the adaptive liquid pipeline silencing system based on jet rectification silencing as described in any one of claims 1 to 5, comprising the following steps: S100: installing an adaptive liquid pipeline silencing system based on jet rectification silencing in the liquid pipeline; S200: The fluid passes through the pump from the pipeline before the pump (100) to form a first vortex (101); S300: The high-pressure pump (802) sucks the liquid filtered by the filter (804) from the rear pipe of the muffler, and then flows back into the jet disk (500) and is ejected through the jet nozzle (501), forming multiple jets with grid-shaped fluid boundaries; S400: the multiple jets at the boundary of the grid-type fluid are mixed with the first vortex (101) entering the muffler housing (300), and the first vortex (101) is dispersed into a second vortex (102), thereby completing preliminary rectification; S500: the fluid after preliminary rectification is transported through the jet disk (500) again to form multiple jets with grid-type fluid boundaries again, and steps S300-S400 are repeated to gradually rectify the second vortex (102) into a laminar flow (103).

7. The method for adaptive liquid pipeline silencing based on jet rectification silencing according to claim 6 is characterized in that: Step S300 also includes: collecting the speed signal of the pump (200) in the liquid pipeline and the flow signal of the flow meter (600) through the muffler controller (700), controlling the speed of the high-pressure pump (802) on the pressurized liquid return component (800) and controlling the opening of the electric control valve (805) of the liquid outlet pipe, and finally controlling the jet speed and flow of the jet disk (500).

8. A design method for an adaptive liquid pipeline silencing system based on jet rectification silencing, characterized in that: The method for designing a sound-absorbing system according to any one of claims 1 to 5 comprises the following steps: S1: Determine the required noise reduction, pressure loss and allowable muffler dimensions; S2: Preliminarily selecting the size, number and flow rate of the jet nozzle (501) according to the required noise reduction amount, pressure loss and allowable muffler external dimensions, so that the self-noise generated by the jet nozzle (501) is lower than the noise reduction target by more than 10 dB; S3: determining the number of required jet disks (500) and the spacing between the jet disks (500) according to the noise reduction target; S4: Selecting the size of the muffler housing (300) according to the specifications, dimensions and spacing of the jet disk (500); S5: Calculate the total flow of the high-pressure pump, and select the model of the high-pressure pump (802) according to the total flow of the high-pressure pump and the pressure difference between the jet nozzle and the liquid pipeline; S6: using fluid simulation software to predict the silencing effect, pressure loss and potential core range of a single jet disk (500); calculating the difference between the pressure loss of the muffler housing (300) caused by the jet disk (500) and the positive pressure of the fluid brought by the high-pressure pump (802) based on the silencing effect, pressure loss and potential core range of the single jet disk (500); S7: By conducting a large number of experimental tests on the product prototype, a database of the jet velocity, flow rate and noise reduction effect of the jet nozzle is established, and written into the muffler controller (700), and the jet velocity and flow rate of the jet disk (500) are controlled by the muffler controller (700).

9. The design method of the adaptive liquid pipeline silencing system based on jet rectification silencing according to claim 8 is characterized in that: include: In step S6, if the pressure loss difference meets the requirement, then it is calculated whether the insertion loss also meets the requirement. Otherwise, it is necessary to repeat steps S2-S5 to redetermine the size, number and flow rate of the jet nozzle (501) until the design target is achieved.

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