Self-adaptive liquid pipeline silencing system and method based on jet flow rectification silencing

Abstract

The invention discloses a self-adaptive liquid pipeline silencing system and method based on jet flow rectification silencing, and the system comprises a silencer housing, at least one jet flow disc disposed in the silencer housing, a flow meter disposed in a pipeline behind a pump, and a silencer controller which is in communication connection with the pump and the flow meter. The pressurizing and liquid returning assembly is arranged on the outlet side of the silencer shell, communicated with the jet flow disc and used for pressurizing and returning liquid at the outlet of the silencer and spraying the liquid out of the jet flow disc; the liquid part at the outlet of the silencer is repeatedly sucked out through the pressurization liquid return assembly and sprayed out through the jet flow nozzles after being pressurized, so that large vortexes generated at the upstream of the pump are scattered and broken into small vortexes, the small vortexes are finally rectified into laminar flow through the multiple stages of jet flow discs, and liquid pressure pulsation is reduced. The silencer controller is used for collecting rotating speed signals and flow signals of the pump and controlling the jet speed and flow of the jet disc, self-adaptive adjustment of the silencing effect of the liquid pipeline is achieved, and the silencing effect is guaranteed.

Description

Technical Field

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

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

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

[0004] The noise of the fluid in the pipeline mainly comes from valves and pumps. Due to the working characteristics of the pump's periodic operation, the output fluid has more and larger vortices, which in turn generates fluid pulsation noise; in addition, when the pump runs at high speed, the internal mechanical parts collide, rub and vibrate, which will also generate corresponding vortices in the fluid. Generally speaking, the pressure pulsation noise level generated by the vortex in the outlet pipe section of the pump can reach 180dB, mainly concentrated near the pump frequency. Valve noise is mainly caused by 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 will cause a large number of vortices in the downstream fluid due to the throttling effect, that is, turbulence, and these turbulent vortices will also propagate upstream. When the speed changes or the valve opening changes, the main frequency of the pressure pulsation will move significantly, resulting in a decrease in the muffler effect of the muffler matching the rated working conditions. If these high-intensity pressure pulsations are not handled, they will generate large fluid noise, seriously affecting the acoustic stealth performance of the ship and the structural safety of the chemical pipeline. Studies have shown that the closer the liquid in the pump or valve inlet pipeline is to horizontal flow, the lower the liquid pulsation pressure level downstream of the pump or valve. Therefore, setting a rectifier at the pump or valve inlet is also important for vibration and noise reduction. This is why liquid pipeline mufflers are also installed at the inlet of the pump or valve in systems with higher requirements for rectification and noise reduction.

[0005] At present, the main method to reduce the noise of fluid in the pipeline is to install a liquid pipeline silencer. Common liquid pipeline silencers mainly include perforated tube silencers and airbag silencers. Among them, the perforated tube silencer is large in size and small in noise reduction. The perforated tube has a certain risk of clogging, and there is a serious attenuation of acoustic performance during use. Although the airbag silencer has a large noise reduction, its pressure loss is high, and its structure is complex, the cost is high, and it is difficult to use and maintain. In addition, both types of silencers require a certain expansion ratio to increase the noise reduction and reduce the pressure loss. Within a certain range, the larger the expansion ratio, the better the noise reduction and the lower the pressure loss. For ships with relatively tight dimensions, it is difficult to integrate these two silencers. In addition, in actual operation, due to changes in the speed of the pump or the valve opening, the center frequency of the pressure pulsation that needs to be eliminated will change. Under such changes, the traditional silencer 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, large sound attenuation volume, small pressure loss and capable of achieving adaptive adjustment. Summary of the invention

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides an adaptive liquid pipeline silencing system and method based on jet rectification silencing, wherein the liquid at the outlet of the muffler is partially sucked out by a high-pressure pump, and is ejected through a jet nozzle after being pressurized, thereby breaking up the large vortex generated upstream of the pump into small vortices, and at the same time converting the low-frequency pressure pulsation that needs 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 disc, the small vortex is finally rectified into laminar flow, and the low-frequency and large-sized pressure pulsation is converted into high-frequency and small-sized pressure pulsation, so that Pressure pulsation is more likely to decay along the pipeline, thereby reducing the magnitude of liquid pressure pulsation. Through a large number of experimental tests on product prototypes, a database of jet velocity, flow rate, and noise reduction effect is established and written into the muffler controller. The pump speed signal and flow rate signal are collected through the muffler controller and a control signal is output to control the speed or valve opening of the high-pressure pump, thereby adjusting the jet velocity and flow rate, improving the adaptability of the muffler, and ensuring the noise reduction effect. The overall structure is compact, the noise reduction volume is large, and the pressure loss is small, which can realize the adaptive adjustment of the noise reduction effect of the liquid pipeline.

[0008] In order to achieve the above-mentioned purpose, one aspect of the present invention provides an adaptive liquid pipeline silencer system based on jet rectification silencer, comprising: a silencer housing 300 arranged in the pipeline where the pump is located, a pump rear pipeline arranged on the side of the silencer housing away from the pump, at least one jet disk arranged in parallel and spaced inside the silencer housing, a flow meter arranged inside the pump rear pipeline, a silencer controller connected to the pump and the flow meter respectively in communication, and a pressurized liquid return component arranged on the outlet side of the silencer housing and in communication with the jet disk for pressurizing and refluxing the liquid at the silencer outlet and spraying it from the jet disk; The jet disk is provided with a jet nozzle which is in communication with the pressurized liquid return assembly. The liquid at the outlet of the muffler is partially sucked out by the pressurized liquid return assembly and ejected through the jet nozzle after being pressurized, thereby dispersing the vortex generated upstream of the pump. After repeatedly passing through the jet disk for rectification, the dispersed vortex is finally rectified into a laminar flow, thereby reducing the pressure pulsation of the liquid. The speed signal of the pump and the flow signal of the flow meter are collected through the muffler controller, and the pressurized liquid return component is controlled to adjust the jet speed and flow of the jet disk, thereby realizing adaptive adjustment of the silencer effect of the liquid pipeline and ensuring the silencer effect.

[0009] Furthermore, the jet disk is a hollow tubular structure, one end away from the liquid outlet pipe is closed, and a plurality of jet nozzles are distributed on the middle tube wall.

[0010] Furthermore, 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 outlet pipe electric control valve for controlling the liquid outlet flow of the jet disk is provided between the outlet pipe and the jet disk; The liquid inlet pipe is connected to the outlet side of the muffler shell; The high-pressure pump is arranged between the liquid outlet pipe and the liquid inlet pipe; The inlet of the high-pressure pump is located at the outlet section of the muffler; The liquid outlet pipe is connected to the jet disk; The speed signal of the pump and the flow signal of the flow meter are collected through the muffler controller, the speed of the high-pressure pump on the pressurized liquid return component and the opening of the electric control valve of the liquid outlet pipe are controlled, and finally the jet speed and flow of the jet disk are controlled, thereby realizing adaptive adjustment of the silencing effect of the liquid pipeline.

[0011] Furthermore, the pressurized liquid return component also includes a filter arranged at the inlet end or the outlet end of the high-pressure pump.

[0012] Furthermore, the jet disk is in a spiral shape or a multi-ring shape; The jet disk is a plane type or a three-dimensional tower type.

[0013] Furthermore, when a plurality of jet disks are used, the center distance between two adjacent jet disks is greater than or equal to the length of the jet core area of ​​the jet nozzle.

[0014] A second aspect of the present invention provides an adaptive liquid pipeline silencing method based on jet rectification silencing, which is implemented by applying the adaptive liquid pipeline silencing system based on jet rectification silencing, and comprises the following steps: S100: installing an adaptive liquid pipeline silencing system based on jet rectification silencing in the liquid pipeline; S200: The fluid forms a first vortex after passing through the pump from the pipeline before the pump; S300: The high-pressure pump sucks the liquid filtered by the filter from the rear pipe of the muffler, and then flows back into the jet disk and is ejected through the jet nozzle, forming a plurality of jets with a grid-shaped fluid boundary; S400: the majority of the jets at the boundary of the grid-type fluid are mixed with the first vortex entering the muffler housing, and the first vortex is dispersed into a second vortex, thereby completing preliminary rectification; S500: the fluid after preliminary rectification is transported through the jet disk again to form multiple jets with grid-type fluid boundaries again, and steps S300-S400 are repeated to gradually rectify the second vortex into laminar flow, so as to achieve attenuation of fluid pressure pulsation until it is eliminated.

[0015] Furthermore, step S300 also includes: collecting the speed signal of the pump in the liquid pipeline and the flow signal of the flow meter through the muffler controller, controlling the speed of the high-pressure pump on the pressurized liquid return component and controlling the opening of the electric control valve of the liquid outlet pipe, and finally controlling the jet speed and flow of the jet disk to achieve adaptive adjustment of the silencer effect of the liquid pipeline.

[0016] The third aspect of the present invention provides a method for designing an adaptive liquid pipeline silencing system based on jet rectification silencing, characterized in that the method for designing the silencing system comprises the following steps: S1: Determine the required noise reduction, pressure loss and allowable muffler dimensions; S2: Preliminary selection of the size, quantity and flow rate of the jet nozzle according to the required noise reduction, pressure loss and allowable muffler dimensions, so that the self-noise generated by the jet nozzle is more than 10dB lower than the noise reduction target; S3: Determine the required number of jet disks and the spacing between the jet disks according to the noise reduction target to achieve virtual segmentation and rectification of the fluid in the jet area; S4: According to the specifications and spacing of the jet disc, select the size of the muffler shell; S5: Calculate the total flow of the high-pressure pump, and select the model of the high-pressure pump according to the total flow of the high-pressure pump and the pressure difference between the jet nozzle and the liquid pipeline to meet the requirements of liquid pressurization and recirculation; S6: Use fluid simulation software to predict the silencing effect, pressure loss and potential core range of a single jet disk; calculate the difference between the pressure loss of the muffler housing caused by the jet disk and the positive pressure of the fluid brought by the high-pressure pump based on the silencing effect, pressure loss and potential core range of a single jet disk, and ensure that the pressure loss difference meets the design requirements; S7: Through a large number of experimental tests on product prototypes, a database of the jet velocity, flow rate and silencing and noise reduction effect of the jet nozzle is established and written into the muffler controller. The jet velocity and flow rate of the jet disk are controlled by the muffler controller to achieve adaptive adjustment of parameters and adaptive adjustment of the silencing effect of the liquid pipeline.

[0017] Furthermore, 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.

[0018] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: (1) The adaptive liquid pipeline silencer system and method based on jet rectification silencer of the present invention sucks out the liquid at the outlet of the silencer through a high-pressure pump, and ejects it through the jet nozzle of the jet disk after pressurization, thereby breaking up the large vortex 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 disk, the small vortex is finally rectified into a laminar flow, and the low-frequency and large-sized pressure pulsation is converted into a high-frequency and small-sized pressure pulsation, so that the pressure pulsation is easier to decay along the pipeline, thereby reducing the magnitude of the liquid pressure pulsation. In addition, by collecting the pump speed signal and the flow signal of the liquid pipeline as input, the control signal is output through the silencer controller to control the speed or valve opening of the high-pressure pump, thereby adjusting the jet speed and flow rate of the jet disk, thereby improving the adaptive ability of the silencer and ensuring the silencer effect.

[0019] (2) The adaptive liquid pipeline silencer system based on jet rectification silencer of the present invention has the characteristics of small pressure loss and little influence on the upstream pump or valve. It can achieve zero pressure loss or even negative pressure loss by increasing the pressure difference between the high-pressure pump and the pipeline liquid and the flow rate of the high-pressure pump, which is impossible to achieve with other existing types of silencers or silencer modules. The liquid pipeline silencer of the present invention introduces multiple relatively low-noise jet beams to divide large-sized vortices into smaller vortices and form a virtual fluid boundary, thereby 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 horizontal flow fluid after rectification silencer, the self-noise of the nozzle is low, so that the ability to reduce the fluid pressure pulsation level can be improved by increasing the jet pressure ratio and jet velocity. By collecting the speed of the pipeline pump to be controlled and the flowmeter signal, the jet velocity and flow rate can be controlled in real time, and adaptive regulation can be achieved. By selectively installing filters or backwashing measures before and after the high-pressure pump, the jet nozzle is prevented from being blocked, ensuring that the silencer effect does not decrease with the increase of usage time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of an adaptive liquid pipeline silencing system based on jet rectification silencing according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a jet disk inside a muffler housing of an adaptive liquid pipeline muffler system based on jet rectification muffler according to an embodiment of the present invention; Figure 3 This is a schematic diagram of jet velocities in different regions of an adaptive liquid pipeline silencing system based on jet rectification silencing according to an embodiment of the present invention; Figure 4 A schematic flow chart of an adaptive liquid pipeline silencing method based on jet rectification silencing according to an embodiment of the present invention; Figure 5 The present invention is a flowchart of a method for designing an adaptive liquid pipeline silencing system based on jet rectification silencing according to an embodiment of the present invention.

[0021] In all the drawings, the same reference numerals represent the same technical features, specifically: 100-front pipeline of the pump, 200-pump, 300-muffler housing, 400-rear pipeline of the pump, 500-jet disk, 501-jet nozzle, 600-flow meter, 700-muffler controller, 800-pressurized liquid return assembly, 801-liquid inlet pipe, 802-high pressure pump, 803-liquid outlet pipe, 804-filter, 805-liquid outlet pipe electric control valve, 101-first vortex, 102-second vortex, 103-laminar flow, 301-inlet flange, 302-outlet flange, 502-jet disk fixing. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended 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.

[0023] 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 being "fixed to", "disposed on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of the two elements or the interaction relationship between the 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 the specific circumstances.

[0024] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] The existing liquid pipeline silencers are mainly of two types: perforated tube type and airbag type. Among them, the perforated tube type requires a larger expansion ratio to achieve a more ideal silencing effect and a smaller pressure loss, which is almost unacceptable for the space-constrained ship piping system; the airbag type has the characteristics of large silencing volume, but the system structure and maintenance are relatively complex, the production cost is high, the 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 speed and power, thereby increasing the vibration reduction and noise reduction index. In addition, in order to adapt to different working conditions, the speed and valve opening of the pump will change, resulting in a mismatch between the original design of the silencer and the actual working conditions, while the perforated tube type does not have the ability to adjust, and the airbag type is difficult to adjust, often requiring manual adjustment, and basically has no adaptive adjustment ability, which ultimately leads to a serious decline in the actual silencing effect.

[0026] Based on the above reasons, if Figure 1 and Figure 2As shown, one aspect of the present invention provides an adaptive liquid pipeline silencer system based on jet rectification silencer, which is installed before or after a pump or a valve to eliminate pressure pulsation caused by liquid flow. The present invention is explained by taking installation after a pump as an example. The silencer system includes a pump 200 arranged in a front pipeline 100 of the pump, a silencer housing 300 arranged behind the pump 200, a pump rear pipeline 400 arranged on the side of the silencer housing 300 away from the pump 200, at least one jet disk 500 arranged in parallel and spaced relation inside the silencer housing 300, a flow meter 600 arranged inside the pump rear pipeline 400, a silencer controller 700 respectively connected to the pump 200 and the flow meter 600, and a device arranged on the outlet side of the silencer housing 300 and communicating with the jet disk 500 for pressurizing the liquid at the outlet of the silencer and refluxing it from the jet disk. The pressurized liquid return component 800 sprayed by the disk 500; the muffler controller 700 is connected to the pressurized liquid return component 800, and the speed signal of the pump 200 and the flow signal of the flowmeter 600 are collected through the muffler controller 700 to control the pressurized liquid return component 800 to adjust the jet speed and flow of the jet disk 500, thereby realizing the adaptive adjustment of the silencing effect of the liquid pipeline; the jet disk 500 is provided with a jet nozzle 501 communicated with the pressurized liquid return component 800, and the liquid at the outlet of the muffler is partially sucked out through the pressurized liquid return component 800, and is sprayed out through the jet nozzle 501 of the jet disk 500 after being pressurized, thereby breaking up the large vortex generated upstream of the pump 200 into small vortices, and after repeated rectification through the jet disk 500, the small vortex is finally rectified into a stable horizontal flow liquid, that is, a laminar flow state, to achieve a reduction in liquid pressure pulsation, thereby ensuring the silencing effect.

[0027] Furthermore, if Figure 1 and Figure 2 As shown, the jet disk 500 is a hollow tubular structure, one end away from the liquid outlet pipe 803 is closed, and a plurality of jet nozzles 501 are distributed on the middle tube wall; the liquid portion of the muffler outlet is sucked out by the high-pressure pump 802, and is ejected through the jet nozzle 501 of the jet disk 500 after being pressurized, thereby breaking up the large vortex generated upstream of the pump 200 into small vortices, and after passing through the jet disk 500, the small vortex is finally rectified into a stable horizontal flow liquid, i.e., a laminar flow state, thereby reducing the liquid pressure pulsation and ensuring the silencer effect.

[0028] Furthermore, if Figure 1 and Figure 2As shown, the pressurized liquid return component 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; a liquid outlet pipe electric control valve 805 for controlling the liquid outlet flow of the jet disk 500 is provided between the liquid outlet pipe 803 and the jet disk 500; the muffler controller 700 is connected to the high-pressure pump 802 and the liquid outlet pipe electric control valve 805 through a control circuit 701 respectively; the muffler controller 700 is connected to the pump 200 and the flow meter 600 through an information acquisition circuit 702 respectively; the muffler controller 700 collects the speed signal of the pump 200 and the flow signal of the flow meter 600, controls the speed of the high-pressure pump 802 on the pressurized liquid return component 800 and controls the opening of the liquid outlet pipe electric control valve 805, and finally controls the jet speed and flow of the jet disk 500, thereby realizing adaptive adjustment of the silencing effect of the liquid pipeline; Furthermore, if Figure 1 and Figure 2 As 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 at the outlet section of the muffler; the liquid outlet pipe 803 is connected to the jet disk 500; the pressurized liquid return component 800 also includes a filter 804 arranged at the inlet end or outlet end of the high-pressure pump 802 to prevent the jet nozzle from being blocked during long-term use; in addition, backwashing can also be performed by reversing the high-pressure pump 802 at fixed intervals to avoid nozzle blockage.

[0029] Furthermore, if Figure 1 and Figure 2 As shown, the muffler housing 300 is a hollow columnar structure, and an inlet flange 301 connected to the pump front pipeline 100 and an outlet flange 302 connected to the pump rear pipeline 400 are respectively provided at both ends; the jet disk 500 is spiral or multi-ring, which is conducive to dividing the fluid in the muffler housing 300 into multiple fluid units that do not interfere with each other; the jet disk 500 can be a plane type or a three-dimensional tower type (refer to the tower spring); when multiple jet disks 500 are used, the center distance between two adjacent jet disks 500 is large. The length of the jet core area is equal to the jet nozzle 501, so as to avoid mutual influence between multiple jet disks 500; the jet disk 500 is fixed to the inner wall of the muffler shell 300 by the jet disk fixing member 502; the present invention uses multiple jets of the jet disk to form a grid-type fluid boundary to rectify the turbulent fluid upstream of the pump 200, and breaks the vortex larger than the grid size into smaller vortices, and then uses the rectified fluid to be transported by the high-pressure pump 802 to form multiple jets again, and so on and so forth, so as to realize the attenuation of the fluid pressure pulsation until it is eliminated.

[0030] Furthermore, if Figure 3 As shown, when the diameter of the jet nozzle 501 is D, the potential core length of the jet is about 8D. Within the potential core length, the jet velocity hardly decays. After passing through the transition zone, the jet velocity gradually decays, and after entering the turbulent zone, the jet velocity decays sharply. In the present invention, the fluid is pressurized by the high-pressure pump 802 and enters the interior of the muffler jet disk 500. The jet zone formed by multiple jet nozzles 501 is used to virtually divide and rectify the fluid entering the muffler in the jet zone, forming multiple fluid areas that do not affect each other, thereby dividing the large vortex upstream of the pump or valve into smaller vortices, thereby avoiding these large vortices from colliding with the pipe wall to produce larger secondary air sound. Due to the introduction of external power, the pressure loss of the actual muffler due to the reduction of the pipeline flow area due to the increase of the jet disk is partially or completely offset by the positive pressure introduced by the increased high-pressure fluid jet, thereby achieving ultra-low pressure loss or even negative pressure loss.

[0031] The radiated noise generated by underwater jets is the self-noise of the fluid caused by the "friction" inside the fluid itself. That is, although the underwater nozzle jet will also generate certain vortices, the noise level generated by these vortices is proportional to the eighth power of the flow velocity. Measured data show that when the flow velocity of the jet reaches 15m / s, the radiated noise level is ≤120dB, which is much lower than the 180dB of the pump or valve. When the difference between the two decibel values ​​is 10dB or more, the two are superimposed on each other, and the effect of the lower decibel value on the total sound level can be ignored. Therefore, the self-noise generated by the underwater jet is completely negligible compared to the fluid noise generated by the pump or valve. The present invention introduces an external power source and uses the original working fluid to silence the liquid pipeline; the controllable jet generated by the small hole of the jet nozzle destroys the turbulent vortex generated by throttling, thereby eliminating the pressure pulsation of the liquid; the present invention uses the principle of external power source pressurizing the fluid in the pipe to form an active jet, cutting and breaking the turbulent vortex rectification, and does not involve complex active control.

[0032] The present invention sucks out the liquid portion of the muffler outlet through a high-pressure pump, and after pressurization, sprays it out through the jet nozzles of the jet disk array, thereby breaking up the large vortex generated upstream of the pump into small vortices, and at the same time converting the low-frequency pressure pulsation that needs 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 vortex is finally rectified into a laminar flow, and the low-frequency and large-sized pressure pulsation is converted into a high-frequency and small-sized pressure pulsation, so that the pressure pulsation is more easily attenuated along the pipeline, thereby achieving a reduction in the magnitude of the liquid pressure pulsation; the collected pump speed signal and the flow signal of the liquid pipeline are used as input, and a control signal is output through the muffler controller to control the speed or valve opening of the high-pressure pump, thereby adjusting the jet speed and flow, thereby improving the adaptability of the muffler and ensuring the muffler effect.

[0033] The adaptive liquid pipeline silencer system based on jet rectification silencer of the present invention, by introducing an external power source jet, can reduce the noise of the pump itself by combing the incoming fluid when installed in front of the pump. When installed after the pump, the large vortex formed by the pump can be broken into small vortices, thereby greatly reducing the blade frequency pulsation pressure; through multi-stage jets, the small vortex can be broken into smaller vortices until it is flat, thereby greatly reducing the fluid pressure pulsation in the pipeline. Due to the introduction of an external power source, the silencer of the present invention has extremely low pressure loss, and even negative pressure loss. By collecting the rotation speed and flow rate changes of the pipeline pump to be controlled, the jet speed and flow rate are controlled in real time, and adaptive adjustment is achieved, so as to keep the silencer effect of the silencer at an optimal level.

[0034] like Figure 4 As shown, the second aspect of the present invention provides an adaptive liquid pipeline silencing method based on jet rectification silencing, which is implemented by applying the adaptive liquid pipeline silencing system based on jet rectification silencing, and includes the following steps: S100: installing an adaptive liquid pipeline silencing system based on jet rectification silencing in a liquid pipeline, including a pre-pump pipeline 100, a muffler housing 300, a post-pump pipeline 400, a jet disk 500, a flow meter 600, a muffler controller 700 and a pressurized liquid return assembly 800; S200: The fluid passes through the pump from the pre-pump pipeline 100 to form a first vortex 101; the first vortex 101 is a large vortex; 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 a plurality of jets with a grid-shaped fluid boundary; S400: the majority of the jets at the boundary of the grid-type fluid are mixed with the first vortex 101 entering the muffler housing 300, and the large-scale first vortex 101 is dispersed into the smaller-scale second vortex 102, completing the preliminary rectification, realizing the reduction of the liquid pressure pulsation, and at the same time, converting the low-frequency large-size pressure pulsation that is difficult to eliminate into the medium-high frequency small-size pressure pulsation that is easy to eliminate; 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, thereby achieving attenuation of the fluid pressure pulsation and converting it into a high-frequency pressure pulsation that is easier to eliminate until it is eliminated.

[0035] Furthermore, 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 silencer 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 to achieve adaptive adjustment of the silencer effect of the liquid pipeline.

[0036] Furthermore, the muffler controller 700 in step S100 is constructed by conducting a large number of experimental tests on product prototypes, establishing a database of jet velocity, flow rate and muffler noise reduction effect of the jet nozzle, and then writing the database into the muffler controller, thereby realizing adaptive adjustment of parameters.

[0037] like Figure 5 As shown, the third aspect of the present invention provides a design method for an adaptive liquid pipeline silencing system based on jet rectification silencing, comprising the following steps: S1: Determine the required noise reduction, pressure loss and allowable muffler dimensions; S2: Preliminarily select the size, quantity and flow rate of the jet nozzle 501 according to the required sound attenuation, pressure loss and allowable muffler dimensions, so that the self-noise generated by the jet nozzle 501 is more than 10 dB lower than the noise reduction target; S3: Determine the number of jet disks 500 required and the spacing between the jet disks 500 according to the noise reduction target, so as to achieve virtual segmentation and rectification of the fluid in the jet area; S4: According to the specifications and spacing of the jet disk 500, the size of the muffler housing 300 is selected to ensure the structural strength and reasonable spatial layout; 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 to meet the requirements of liquid pressurization and recirculation; S6: Use fluid simulation software to predict the silencing effect, pressure loss and potential core range of a single jet disk 500; calculate 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 according to the silencing effect, pressure loss and potential core range of the single jet disk 500, and ensure that the pressure loss difference meets the design requirements; S7: By conducting a large number of experimental tests on product prototypes, a database of the jet velocity, flow rate and silencing and noise reduction effects of the jet nozzle is established and written into the muffler controller 700. The jet velocity and flow rate of the jet disk 500 are controlled by the muffler controller 700 to achieve adaptive adjustment of parameters and adaptive adjustment of the silencing effect of the liquid pipeline.

[0038] Furthermore, in step S6, if the pressure loss difference meets the requirement, then the insertion loss is calculated to see whether it also meets the requirement, otherwise, steps S2-S5 need to be repeated to re-determine the size, number and flow rate of the jet nozzle 501 until the design target is reached; Furthermore, determining the required noise reduction, pressure loss, and allowable muffler dimensions in step S1 includes: Test or simulate to calculate the magnitude of the noise source; Determine the muffler main frequency and muffler volume, the allowable muffler dimensions and the allowable pressure loss of the muffler according to the magnitude of the noise source; The flow rate of the jet nozzle 501 in step S1 is calculated by formula (1): (1) in, is the pressure difference between the jet nozzle and the liquid pipeline; is the liquid density; is the flow coefficient; Self-noise of a single jet nozzle Calculated by formula (2): (2) in, is the nozzle inlet and outlet pressure ratio; is the air temperature; is the molecular weight of air; and are the temperature and molecular weight of the fluid respectively; is the jet nozzle diameter; When the self-noise is more than 10dB lower than the noise reduction target, the jet nozzle is qualified in the preliminary selection; Further, in step S4, the total flow rate of the high-pressure pump is calculated according to the flow rate of a single jet nozzle and the number of jet nozzles on a single jet disk; The flow rate of a single jet nozzle is calculated by formula (3): (3) in, is the diameter of a single jet nozzle; Total flow of high pressure pump It is expressed by formula (4): (4) Wherein, N is the number of jet nozzles, which is determined by the specifications of the jet disk.

[0039] Through the above design method, it can be ensured that the liquid pipeline muffler achieves optimal performance in reducing noise and controlling pressure loss, while also ensuring the reliability and economy of the system.

[0040] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in 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), at least one jet disk (500) provided in parallel and at intervals inside the muffler housing (300), a flow meter (600) provided inside the pump rear pipeline (400), a muffler controller (700) respectively connected to and communicating with the pump (200) and the flow meter (600), and a pressurized liquid return component (800) provided on the outlet side of the muffler housing (300) and in communication with the jet disk (500) and used for pressurizing and returning liquid at the muffler outlet and spraying it out from 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 pressurized liquid return assembly (800) comprises 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 outlet pipe (803) and the jet disk (500); 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. The adaptive liquid pipeline silencing system based on jet rectification silencing according to claim 3 is characterized in that: The pressurized liquid return component (800) further comprises a filter (804) arranged at the inlet end or the outlet end of the high-pressure pump (802).

5. An adaptive liquid pipeline silencing system based on jet rectification silencing according to any one of claims 1 to 4, 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.

6. An adaptive liquid pipeline silencing system based on jet rectification silencing according to any one of claims 1 to 4, 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).

7. 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 6, 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 a plurality of jets with a grid-shaped fluid boundary; S400: the majority of the jets at the grid-type fluid boundary 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).

8. The method for adaptive liquid pipeline silencing based on jet rectification silencing according to claim 7 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).

9. 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 6 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).

10. The design method of the adaptive liquid pipeline silencing system based on jet rectification silencing according to claim 9 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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