Pipeline liquid noise detection device

Abstract

The utility model discloses a pipeline liquid noise detection device, and belongs to the technical field of pipeline liquid noise detection. The device comprises a silencing detection system and a liquid flow generation system, the silencing detection system comprises a detection pipeline, connecting units and a plurality of hydrophones, and the two ends of a to-be-detected element are connected with the middle of the detection pipeline in series through the connecting units; the connecting units can be bent relatively so as to adapt to the to-be-detected elements with different sizes; the plurality of hydrophones are arranged along the detection pipeline so as to detect noise generated when the liquid flows through the to-be-detected element; the liquid flow generation system comprises a liquid flow pipeline and reduction units, and the two reduction units are arranged at the two ends of the liquid flow pipeline and used for conducting noise elimination, noise reduction and interference elimination on flowing external liquid; and two ends of the liquid flow pipeline are respectively communicated with two ends of the detection pipeline to form a closed liquid flow loop. The noise detection device can detect the noise change when the liquid flow passes through the element to be detected.

Description

Technical Field

[0001] This utility model relates to the field of pipeline liquid noise detection technology, and in particular to a pipeline liquid noise detection device. Background Technology

[0002] Ships navigating on or under water need to transport large quantities of various liquids, including clean water, sewage, fuel oil, lubricating oil, and cooling oil. During transport, these liquids flow through various pipe components, such as valves, elbows, and reducers. As the liquids flow through these components, varying degrees of vibration and noise are generated due to friction between the fluid and the pipe walls, the generation of eddies, and sudden pressure changes.

[0003] These noises can not only cause resonance damage to the overall structure of the ship, but also create serious noise pollution, interfering with the normal operation of ship equipment and the health and well-being of the crew. Especially in specialized vessels such as submarines where extremely quiet operation is required, the control of fluid noise is of paramount importance.

[0004] Currently, there is a lack of specialized equipment capable of detecting fluid noise from pipe components of different sizes and types. Conventional noise detection devices often suffer from the following problems: inability to adapt to components of different sizes, susceptibility to external fluid flow interference during detection, lack of a complete fluid circulation system, and inability to simultaneously monitor noise signals and fluid parameters. These problems severely limit the accuracy and reliability of pipeline fluid noise detection. Utility Model Content

[0005] In view of this, it is necessary to provide a pipeline liquid noise detection device to solve the problem of the lack of a professional device in the prior art that can detect fluid noise for pipeline components of different sizes and types.

[0006] This utility model provides a pipeline liquid noise detection device for detecting the noise when liquid flows through a component under test, including:

[0007] A noise reduction detection system includes a detection pipe, a connecting unit, and multiple hydrophones. The two ends of the element to be tested are connected in series with the middle of the detection pipe through the connecting unit. The connecting unit can be bent to accommodate elements of different sizes. Multiple hydrophones are arranged along the detection pipe to detect the noise generated when liquid flows through the element to be tested.

[0008] A liquid flow generation system includes a liquid flow pipe and two damping units. The damping units are located at both ends of the liquid flow pipe to reduce noise and eliminate interference from the flowing external liquid. The two ends of the liquid flow pipe are respectively connected to the two ends of the detection pipe to form a closed liquid flow loop.

[0009] Furthermore, the connection unit includes multiple branch pipes, a ball joint, and a rotary joint. The ball joint and the rotary joint are respectively disposed between two of the branch pipes, forming a linear connection structure that can be freely bent and adjusted.

[0010] Furthermore, the branch pipe is a straight pipe or a bend-shaped pipe, the branch pipe located at one end is detachably connected to the element to be tested, and the branch pipe located at the other end is connected to the detection pipe.

[0011] Furthermore, it also includes a first processing module for acquiring and processing noise signals, the first processing module being electrically connected to the plurality of hydrophones via cables.

[0012] Furthermore, the damping unit includes a vibration damping connector and a water silencer connected to the liquid flow pipeline. The vibration damping connector can reduce the vibration of the liquid flow relative to the pipeline; the water silencer can reduce the noise of the liquid flow.

[0013] Furthermore, the liquid flow generation system also includes a water tank and a water pump connected in sequence to the liquid flow pipeline, as well as a liquid flow control unit. The liquid flow control unit includes an electromagnetic flow valve for measuring the flow rate of the liquid flow pipeline and an electric throttle valve for changing the flow rate of the liquid flow pipeline. The electromagnetic flow valve and the electric throttle valve are respectively connected to the liquid flow pipeline.

[0014] Furthermore, the noise reduction detection system also includes a pressure detection unit, which includes multiple pressure gauges for detecting the internal pressure of the liquid flow pipeline, and the multiple pressure gauges are equidistantly arranged along the detection pipeline.

[0015] Furthermore, it also includes a second processing module for controlling and monitoring pipeline pressure, the second processing module being electrically connected via cables to a plurality of the pressure gauges and electromagnetic flow valves.

[0016] Furthermore, at least two shut-off valves for opening and closing the pipeline are provided on the liquid flow pipeline.

[0017] Furthermore, the liquid flow pipe is equipped with a thermometer for measuring temperature and a vacuum gauge for measuring vacuum.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) A pipe liquid noise detection device of this utility model is provided with a noise reduction detection system. The noise reduction detection system includes a detection pipe, a connecting unit, and multiple hydrophones. The two ends of the element to be detected are connected in series with the middle of the detection pipe through the connecting unit and are inserted into the detection pipe. The detection pipe can input liquid flow into the element to be detected. The connecting unit can be bent relatively to adjust the position and angle of the joint of the connecting unit, thereby adapting to the element to be detected of different sizes and expanding the applicability of the device. Multiple hydrophones are set along the detection pipe. The noise generated by the liquid flowing through the element to be detected can propagate along the water body and be detected by hydrophones at different distances from the element to be detected.

[0020] (2) The present invention provides a pipeline liquid noise detection device, which includes a liquid flow generation system. The liquid flow generation system includes a liquid flow pipeline and two damping units. The two damping units are located at both ends of the liquid flow pipeline and can dampen and reduce the noise of the flowing external liquid, so as to avoid the vibration and noise generated by the components located on the liquid flow pipeline from interfering with the detection of the hydrophone. The two ends of the liquid flow pipeline are respectively connected to the two ends of the detection pipeline. The liquid flow pipeline can supply a stable liquid flow to the detection pipeline to simulate the actual working conditions to be detected. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the silencing detection system in this utility model;

[0024] Figure 3 This is a partial structural diagram of the liquid flow generation system in this utility model. Figure 1 ;

[0025] Figure 4 This is a partial structural diagram of the liquid flow generation system in this utility model. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the connecting unit in this utility model. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the connecting unit in this utility model. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the connecting unit in this utility model. Figure 3 ;

[0029] Figure 8 This is a schematic diagram of the connecting unit in this utility model. Figure 4 .

[0030] In the diagram, 100 is the noise reduction detection system; 110 is the detection pipe; 120 is the connection unit; 121 is the branch pipe; 122 is the ball joint; 123 is the rotary joint; 130 is the hydrophone; 140 is the pressure detection unit; and 141 is the pressure gauge.

[0031] 200. Fluid flow generation system; 210. Fluid flow pipeline; 220. Damping unit; 221. Vibration damping pipe; 222. Water silencer; 230. Water tank; 240. Water pump; 250. Fluid flow control unit; 251. Electromagnetic flow valve; 252. Electric throttle valve; 260. Shut-off valve; 270. Thermometer; 280. Vacuum gauge; 290. Filter;

[0032] 300. First processing module;

[0033] 400. Second processing module;

[0034] 500. Component to be tested. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0036] This embodiment of a pipeline liquid noise detection device relates to the field of pipeline liquid noise detection technology. By setting up a detection system, the component to be tested is detachably installed in the detection system. By adjusting the flow rate and pressure of the liquid, the noise change when the liquid flows through the component to be tested is detected, thereby assessing the vibration and noise that may be caused after the corresponding component is actually installed on the hull.

[0037] Please see Figures 1 to 8 This embodiment discloses a pipeline liquid noise detection device for detecting the noise generated by liquid flow through a test element 500. It includes a noise reduction detection system 100 and a liquid flow generation system 200. The noise reduction detection system can detect the noise generated by the test element 500 when the liquid flows through it. The liquid flow generation system 200 can provide the noise reduction detection system with adjustable flow rate and pressure, enabling comprehensive detection under different operating conditions.

[0038] The noise reduction detection system 100 includes a detection pipe 110, a connecting unit 120, and multiple hydrophones 130. The two ends of the element under test 500 are connected in series with the middle of the detection pipe 110 via the connecting unit 120, thus entering the detection pipe. The detection pipe allows liquid flow into the element under test 500. The connecting unit 120 can be bent to adjust the position and angle of its connectors, thereby adapting to elements under test 500 of different sizes and expanding the applicability of the device. Multiple hydrophones 130 are arranged along the detection pipe 110. Noise generated by the liquid flowing through the element under test 500 can propagate along the water body and be detected by the hydrophones 130 at different distances from the element under test 500.

[0039] The liquid flow generation system 200 includes a liquid flow pipe 210 and two damping units 220. The two damping units 220 are located at both ends of the liquid flow pipe 210 and can dampen and reduce the noise of the flowing external liquid, preventing the vibration and noise generated by the components located on the liquid flow pipe 210 from interfering with the detection of the hydrophone 130. The two ends of the liquid flow pipe 210 are respectively connected to the two ends of the detection pipe 110, and the liquid flow pipe 210 can supply a stable liquid flow to the detection pipe 110 to simulate the actual working conditions to be detected.

[0040] During use, the component under test is connected in series in the middle of the test pipe 110 via the flexible connection unit 120, forming an adjustable test section. The liquid flow generation system 200 drives the liquid to circulate in a closed loop, and the damping unit 220 suppresses vibration noise at the liquid inlet and outlet. When the fluid flows through the component under test, multiple hydrophones 130 simultaneously collect the acoustic signals generated. The closed loop structure effectively isolates external environmental noise, while the flexible connection unit 120 ensures that components of different specifications can be stably connected to the test pipe 110.

[0041] In some embodiments, please refer to Figures 5 to 8 The connection unit 120 includes multiple branch pipes 121, a ball joint 122, and a rotary joint 123. The ball joint 122 and the rotary joint 123 are connected by the branch pipes 121 to form a linear connection structure that can be freely bent and adjusted. The linear connection structure can be rotated and bent as needed, so it can be connected to the test element 500 of different sizes and dimensions, thus expanding the applicability of the device and enabling the installation and testing of different elements.

[0042] In practical implementation, branch pipe 121 is a rigid tubular structure used to transmit fluid flow, which can be implemented using a straight pipe or a bend pipe. Different spatial layouts can be adapted by changing the shape and number of branch pipes 121. Spherical adapter 122 is a connecting component with a spherical contact surface, which can be implemented using a sleeve structure with nested spheres, allowing the connecting unit 120 to deflect at multiple angles. Rotary joint 123 is a connecting component with axial rotation function, which can be implemented using an annular sealing structure with a bearing, enabling the branch pipe 121 to rotate around its own axis.

[0043] It should be noted that the spherical adapter 122 includes a flange with an internal spherical chamber, and a ball head with a central opening that fits tightly with the spherical chamber. The ball head can rotate relative to the spherical chamber to achieve angle changes.

[0044] When there are differences in the installation position or size of the element to be tested 500, the overall bending angle and extension length of the connecting unit 120 can be adjusted by adjusting the combination of the branch pipes 121, combined with the multi-directional deflection capability of the ball joint 122 and the axial rotational freedom of the rotary joint 123. For example, when the length of the element to be tested 500 is greater than the spacing of the standard testing pipes 110, the total length of the connecting unit 120 can be extended by increasing the number of branch pipes 121 and adjusting their bending angle; when there is an asymmetrical installation requirement for the element to be tested 500, the spatial orientation of the branch pipes 121 can be adjusted by the axial rotation of the rotary joint 123 to ensure the sealed connection of the fluid flow path.

[0045] Traditional testing equipment uses a rigid connection structure of fixed length, which cannot adapt to the installation requirements of components of different sizes. However, this solution uses a flexible modular connection structure, which allows the testing pipe 110 to be quickly matched with the components 500 to be tested of different lengths and installation angles, thus avoiding liquid leakage or testing errors caused by size mismatch.

[0046] In some embodiments, a branch pipe 121 at one end is detachably connected to the element under test 500, and a branch pipe 121 at the other end is connected to the detection pipe 110. The branch pipe 121 is connected via a flange, thread, or clamp, specifically using a quick connector or bolt fastening device, to facilitate convenient installation and disconnection between the branch pipe 121 and the element under test 500. The branch pipe 121 at one end secures the element under test 500 via a detachable connection structure, while the branch pipe 121 at the other end forms a stable connection with the detection pipe 110, thereby ensuring no leakage when liquid flows in a closed loop.

[0047] Existing fluid noise detection equipment typically uses fixed pipe connections, making it difficult to adapt to the different sizes or shapes of the components to be tested (500). This solution utilizes a combination of straight and curved pipes, along with a detachable connection structure, allowing the detection device to flexibly adjust the shape and connection method of the branch pipes (121) to adapt to diverse detection scenarios.

[0048] In some embodiments, please refer to Figure 1 A pipe liquid noise detection device also includes a first processing module 300, which is electrically connected to multiple hydrophones 130 via cables. The first processing module 300 acquires and processes multi-dimensional noise data when the liquid flows through the element to be detected 500 in real time, and accurately identifies the location and spectral characteristics of the noise source.

[0049] In practical implementation, the first processing module 300 is an electronic device capable of receiving, converting, and analyzing the acoustic signals collected by the hydrophone 130. Specifically, it can be implemented using a digital signal processor or embedded system in conjunction with filtering and amplification circuits to convert analog signals into digital signals and perform noise reduction processing. The cable serves as the physical transmission medium connecting the hydrophone 130 and the processing module; it can be implemented using shielded twisted-pair cable or optical fiber to suppress electromagnetic interference and ensure the synchronization and integrity of signal transmission.

[0050] During operation, multiple hydrophones 130 are arranged around the detection pipe 110 to capture multi-directional acoustic signals generated as liquid flows through the element under test 500. These signals are transmitted via cables to the first processing module 300. In the first processing module 300, the signals are first pre-amplified and bandpass filtered to eliminate high-frequency noise and low-frequency vibration interference. Then, the analog signals are converted into digital signals by an analog-to-digital converter, and a fast Fourier transform algorithm is used for spectrum analysis to finally generate frequency domain data reflecting the noise characteristics. Through multi-channel parallel processing technology, the signals from multiple hydrophones 130 can be processed simultaneously, avoiding signal delay or phase distortion.

[0051] In some embodiments, please refer to Figure 3 and Figure 4 The damping unit 220 includes a vibration damping pipe 221 and a water silencer 222 connected to the liquid flow pipe 210. The vibration damping pipe 221 can reduce the vibration of the liquid flow relative to the pipe, and the water silencer 222 can reduce the noise of the liquid flow. The two work together to reduce vibration and interference from outside the detection pipe 110, ensuring that the hydrophone 130 is not affected by external interference.

[0052] In a specific embodiment, the vibration damping connector 221 is a connecting component that absorbs the impact energy of the liquid flow through a flexible structure. Specifically, it can be implemented using a metal bellows or rubber hose wrapped with elastic material. Its function is to isolate the mechanical vibration transmission between the liquid flow pipe 210 and external equipment, preventing vibration from interfering with the noise detection results. The water silencer 222 is a device that reduces liquid flow noise through an internal sound-absorbing structure. Specifically, it can be implemented using an internal porous sound-absorbing material or an expansion cavity structure. Its function is to eliminate the background noise generated by the liquid flow itself, reducing interference with the target noise detected by the hydrophone 130.

[0053] When external liquid flows into the liquid flow pipe 210, the vibration damping connector 221 absorbs the pipe vibration caused by the pressure fluctuation of the liquid flow through its own flexible deformation, while the water silencer 222 converts the sound energy of the liquid flow turbulence into heat energy through its internal sound-absorbing structure, thereby reducing the overall noise level of the liquid flow system. The two work together to form a double noise reduction barrier, so that the liquid flow entering the detection pipe 110 is in a stable state of low vibration and low noise, providing a clean testing environment for the subsequent testing of the noise of the component under test 500.

[0054] In some embodiments, please refer to Figure 3 and Figure 4 The liquid flow generation system 200 also includes a water tank 230 and a water pump 240, which are sequentially connected to the liquid flow pipeline 210, as well as a liquid flow control unit 250. The liquid flow control unit 250 includes an electromagnetic flow valve 251 and an electric throttle valve 252, which are respectively connected to the liquid flow pipeline 210. The electric throttle valve 252 can adjust the liquid flow rate in the liquid flow pipeline 210 to simulate different working conditions. The electromagnetic flow valve 251 can monitor the flow rate in the liquid flow pipeline 210 in real time, and, in conjunction with the hydrophone 130, detect the noise at the corresponding flow rate.

[0055] In a specific embodiment, the electromagnetic flow valve 251 is a device that measures the flow rate of liquid in a pipeline through the principle of electromagnetic induction. Specifically, it can be implemented using an electromagnetic flowmeter with signal output function. Its function is to monitor the actual flow data of the liquid pipeline 210 in real time, providing a basis for flow regulation. The electric throttle valve 252 is a device that adjusts the valve opening to change the flow rate through an electric actuator. Specifically, it can be implemented using an electric regulating valve with feedback control function. Its function is to dynamically adjust the liquid flow velocity in the pipeline based on the flow measurement results, creating different operating conditions. The water tank 230 is a container for storing liquid. Specifically, it can be implemented using a closed storage tank with liquid level control function. Its function is to provide a stable liquid source for the liquid pipeline 210. The water pump 240 is a power device used to drive the liquid to circulate within the pipeline. Specifically, it can be implemented using a variable frequency speed-regulating centrifugal pump. Its function is to generate controllable liquid flow pressure.

[0056] In operation, the liquid generation system 200 stores the liquid to be circulated in the water tank 230, and the water pump 240 drives the liquid into the liquid flow pipeline 210 to form a closed loop. In the liquid flow control unit 250, the electromagnetic flow valve 251 collects the flow data in the pipeline in real time, and the electric throttle valve 252 adjusts the valve opening according to the preset test requirements. The two work together to accurately control the flow rate without interrupting the liquid flow.

[0057] In some embodiments, please refer to Figure 2 The noise reduction detection system 100 also includes a pressure detection unit 140, which includes multiple pressure gauges 141 for detecting the internal pressure of the liquid flow pipe 210. The multiple pressure gauges 141 are equidistantly arranged along the detection pipe 110, and the pressure gauges 141 can monitor the pressure at different locations in the pipe.

[0058] In practical implementation, the pressure detection unit 140 is a device used to monitor the pressure changes inside the liquid flow pipeline 210 in real time. It can be implemented using a digital pressure sensor or a mechanical pressure gauge, and displays the pressure signal by converting it into an electrical signal or mechanical scale. The pressure gauge 141 is a measuring device installed on the outer wall or inner cavity of the pipeline. It can be implemented using a diaphragm pressure sensor or a piezoelectric sensor, and outputs corresponding data by sensing changes in the static or dynamic pressure of the fluid.

[0059] When liquid flows through the element to be detected 500, the pressure gauge 141 continuously collects pressure data in the pipeline and transmits the signal to the second processing module 400. Since pressure changes are related to fluid flow rate and pipeline vibration, the equidistantly arranged pressure gauges 141 can synchronously record the pressure gradient along the pipeline axis.

[0060] Please see Figure 1 A pipeline liquid noise detection device also includes a second processing module 400. The second processing module 400 is electrically connected to multiple pressure gauges 141 and electromagnetic flow valves 251 via cables. Through the synergistic effect of real-time pressure monitoring and flow regulation, the second processing module 400 ensures that the liquid flow environment in the detection pipeline 110 remains stable, thereby improving the accuracy and reliability of noise signal acquisition.

[0061] In the specific implementation process, the second processing module 400 is an electronic device with data acquisition and control functions. Specifically, it can be implemented using an embedded controller or an industrial computer to receive pressure signals and generate flow regulation commands.

[0062] During the operation of the fluid flow loop, multiple pressure gauges 141 are equidistantly distributed along the detection pipeline 110, collecting pressure data at different locations in real time and transmitting it to the second processing module 400. The second processing module 400 performs comprehensive analysis of the pressure signals. If abnormal pressure fluctuations are detected, a control signal is sent to the electromagnetic flow valve 251 to adjust the valve opening and change the fluid flow velocity, restoring the pipeline pressure to a preset range. For example, when pressure gauge 141 detects that the pressure in a certain section of the pipeline exceeds a threshold, the processing module can immediately reduce the opening of the electromagnetic flow valve 251, reducing the fluid input to balance the pressure.

[0063] Traditional fluid detection equipment typically relies on manual observation of pressure gauges and manual valve adjustments, which suffers from response lag and operational errors. This solution, however, integrates a pressure gauge 141, an electromagnetic flow valve 251, and a processing module to achieve automated closed-loop control of pipeline pressure, quickly eliminating the interference of pressure fluctuations on noise detection.

[0064] In some embodiments, at least two shut-off valves 260 are provided on the liquid flow pipeline 210 for opening and closing the pipeline. The shut-off valves 260 can control the connection and closure of the pipeline.

[0065] In practical implementation, the liquid flow pipeline 210 is a closed channel for transporting liquid, which can be made of stainless steel or corrosion-resistant alloy materials. An internal liquid flow path is formed to construct a circulation loop for liquid flow control. The shut-off valve 260 is a device that controls the valve core's rise and fall by rotating a handwheel or drive device to open or close the pipeline. It can be a flanged or threaded connection structure, and its valve body has an internal sealing surface to block liquid flow, used to isolate specific pipeline sections during testing.

[0066] When noise testing of the element 500 is required, the connection between the liquid flow pipeline 210 and the external system can be cut off by closing the shut-off valve 260, thus forming an independent and closed testing environment.

[0067] In some embodiments, the liquid flow pipe 210 is provided with a thermometer 270 and a vacuum gauge 280 for measuring the vacuum level. The thermometer 270 can measure the temperature of the liquid flow in real time, and the vacuum gauge 280 can measure the vacuum level inside the pipe.

[0068] In practical implementation, thermometer 270 is a device used to monitor the liquid temperature inside the liquid flow pipe 210 in real time. It can be implemented using a glass thermometer 270 or an electronic thermometer 270. Temperature data can be used to determine if the liquid flow is abnormal, avoiding noise interference caused by temperature changes. Vacuum gauge 280 is an instrument used to detect the vacuum level inside the liquid flow pipe 210. It can be implemented using a mechanical vacuum gauge 280 or a digital vacuum gauge 280. Vacuum level data can identify whether there is cavitation or leakage in the pipe, thereby eliminating noise problems caused by pressure fluctuations.

[0069] During the operation of the liquid flow pipeline 210, the thermometer 270 continuously collects liquid temperature information. When the temperature exceeds the preset range, the liquid flow parameters can be adjusted in a timely manner to avoid vibration noise caused by thermal expansion and contraction. The vacuum gauge 280 simultaneously monitors the vacuum level inside the pipeline. If an abnormal vacuum level is detected, it indicates that cavitation or sealing failure may exist. In this case, corresponding measures can be taken to eliminate liquid flow noise caused by pressure imbalance. Temperature and vacuum level data together provide basic parameters for noise source analysis, ensuring the accuracy of the detection results.

[0070] It should be noted that a filter 290 is installed in the liquid flow pipeline. The main function of filter 290 is to remove impurities and particles from the seawater, providing a cleaner water source for subsequent treatment or use. It is commonly used in seawater desalination systems and ship cooling systems to realistically simulate the working environment of the component 500 under test.

[0071] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A pipe liquid noise detection device, used to detect the noise when liquid flows through a component to be tested, characterized in that, include: A noise reduction detection system includes a detection pipe, a connecting unit, and multiple hydrophones. The two ends of the element to be tested are connected in series with the middle of the detection pipe through the connecting unit. The connecting unit can be bent to accommodate elements of different sizes. Multiple hydrophones are arranged along the detection pipe to detect the noise generated when liquid flows through the element to be tested. A liquid flow generation system includes a liquid flow pipe and two damping units. The damping units are located at both ends of the liquid flow pipe to reduce noise and eliminate interference from the flowing external liquid. The two ends of the liquid flow pipe are respectively connected to the two ends of the detection pipe to form a closed liquid flow loop.

2. The pipeline liquid noise detection device according to claim 1, characterized in that, The connection unit includes multiple branch pipes, a spherical adapter, and a rotary joint. The spherical adapter and the rotary joint are respectively disposed between two of the branch pipes to form a linear connection structure that can be freely bent and adjusted.

3. The pipeline liquid noise detection device according to claim 2, characterized in that, The branch pipe is a straight pipe or a bend-shaped pipe. The branch pipe at one end is detachably connected to the element to be tested, and the branch pipe at the other end is connected to the detection pipe.

4. The pipeline liquid noise detection device according to claim 1, characterized in that, It also includes a first processing module for acquiring and processing noise signals, the first processing module being electrically connected to the plurality of hydrophones via cables.

5. A pipeline liquid noise detection device according to claim 1, characterized in that, The damping unit includes a vibration damping connector and a water silencer connected to the liquid flow pipeline. The vibration damping connector can reduce the vibration of the liquid flow relative to the pipeline; the water silencer can reduce the noise of the liquid flow.

6. The pipeline liquid noise detection device according to claim 1, characterized in that, The liquid flow generation system also includes a water tank and a water pump connected in sequence to the liquid flow pipeline, as well as a liquid flow control unit. The liquid flow control unit includes an electromagnetic flow valve for measuring the flow rate of the liquid flow pipeline and an electric throttle valve for changing the flow rate of the liquid flow pipeline. The electromagnetic flow valve and the electric throttle valve are respectively connected to the liquid flow pipeline.

7. A pipeline liquid noise detection device according to claim 6, characterized in that, The noise reduction detection system also includes a pressure detection unit, which includes multiple pressure gauges for detecting the internal pressure of the liquid flow pipeline. The multiple pressure gauges are equidistantly arranged along the detection pipeline.

8. A pipeline liquid noise detection device according to claim 7, characterized in that, It also includes a second processing module for controlling and monitoring pipeline pressure, which is electrically connected via cables to a plurality of the pressure gauges and electromagnetic flow valves.

9. A pipeline liquid noise detection device according to claim 1, characterized in that, At least two shut-off valves for opening and closing the pipeline are installed on the liquid flow pipeline.

10. A pipeline liquid noise detection device according to claim 1, characterized in that, The liquid flow pipe is equipped with a thermometer for measuring temperature and a vacuum gauge for measuring vacuum.

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