A diaphragm-type pressure wave generator driven by compressed gas and its use method

Abstract

The application discloses a diaphragm type pressure wave generator driven by compressed gas and a use method, and relates to the technical field of pressure wave generators. The pressure wave generator assembly comprises a first clamping plate and a second clamping plate arranged oppositely, and a diaphragm clamped and sealed between the first clamping plate and the second clamping plate. A first recess is formed in the clamping surface of the first clamping plate, and the first recess and the diaphragm form a gas cavity. The gas cavity is connected with a compressed gas supply source in a gas circuit. A second recess is formed in the clamping surface of the second clamping plate, and the second recess and the diaphragm form a pressure wave conduction fluid cavity. The second clamping plate is provided with a pressure wave conduction fluid channel communicated with the pressure wave conduction fluid cavity. A compressed gas filling and discharging control module is arranged on the gas circuit and used for controlling the filling and discharging of the compressed gas into and out of the gas cavity. The application effectively solves the problems of poor coupling of the existing pipeline pressure wave generator with a pipeline and inconvenient operation, and has the advantages of simple structure, reasonable design, compact structure and small volume, and is convenient to carry.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline detection equipment, and in particular relates to a diaphragm-type pressure wave generator driven by compressed gas and a method of using the same. Background Art

[0002] Pressure waves are a phenomenon in which parameters such as pressure and density of a pressurized fluid undergo continuous fluctuations when they are disturbed. These waves can propagate and attenuate along the fluid in a pipeline. Pressure waves carry the energy and information of the medium during their propagation and are widely present in industrial processes in many fields, including petrochemicals, energy, chemicals, drilling, and water transportation. By leveraging the information-transmitting properties of pressure waves, pressure wave generators can be used to actively stimulate pressure waves for the detection and evaluation of abnormal conditions in pipelines, including leaks, blockages, abnormal branches, and abnormal pipe diameters. Timely detection and diagnosis of pipeline anomalies can reduce medium loss during pipeline transportation, thereby reducing economic losses and environmental pollution, and are of great significance to industrial production safety and the safety of people's lives and property.

[0003] In announcement number CN1848626A, an electromagnetic pressure wave generator is provided. In an electromagnet, an alternating current drives a coil to generate reciprocating motion, thereby periodically compressing the gas in the cavity to generate pressure waves. The pressure waves are transmitted to the working medium through an elastic diaphragm. The pressure wave signal intensity generated by this pressure wave generator is low and is easily attenuated in the pipeline, which cannot meet the requirements for detecting pipeline anomalies. In announcement number CN106499957A, a pressure wave signal generator and a real-time tracking and positioning method for a detector in a pipeline are provided. The pressure wave signal generator is installed on the flange of the detector in the pipeline. The screw is driven to rotate by gears and a reducer. The kinematic pair converts the screw rotational motion into the linear motion of the swing arm, and the spring energy storage is released to generate pressure waves. The transmission path of this pressure wave generator is long and the energy loss is high. The energy storage time required to complete a single pressure wave excitation is too long. Publication No. CN103384561B provides a pressure wave generator with a movable control rod for generating pressure waves in a medium, including a movable piston with a guide portion. The control rod controls the piston to impact a transducer to generate pressure waves. The structure may include a damper that can decelerate the control rod independently of the piston. The structure of this pressure wave generator is relatively complex and cannot generate continuous pressure waves, which is not suitable for pipeline anomaly detection. Publication No. CN112856238B provides a mechanically driven continuous impact pressure wave generator and a pipeline anomaly detection device based on it. The motor drives the crankshaft connecting rod to drive the plunger to reciprocate, and the plunger impacts the diaphragm to generate pressure fluctuations. This pressure wave generator can generate a strong pressure wave signal, but the transmission structure is complex and the pressure wave excitation frequency is low.

[0004] In summary, the design of the above pressure wave generator is only applicable to the respective design purpose, but for the diagnosis and detection of abnormal state of the pipeline, there are technical problems of low strength of the generated pressure wave signal, complex structure of the pressure wave generator or cumbersome operation, long time required for excitation, only single pressure wave excitation can be realized, or the frequency of continuous pressure wave excitation is low and uncontrollable. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a diaphragm type pressure wave generator driven by compressed gas and a use method, which aims to solve the technical problems of low strength of the generated pressure wave signal, complex structure of the pressure wave generator or cumbersome operation, long time required for excitation, only single pressure wave excitation can be realized, or the frequency of continuous pressure wave excitation is low and uncontrollable.

[0006] In order to solve the above technical problems, the present application is realized by the following technical scheme:

[0007] A diaphragm type pressure wave generator driven by compressed gas, comprising:

[0008] a compressed gas supply source;

[0009] a pressure wave generating assembly, the pressure wave generating assembly comprising a first clamping plate and a second clamping plate arranged oppositely, and a diaphragm clamped between the first clamping plate and the second clamping plate; a first recess is formed on the clamping surface of the first clamping plate, the first recess and the diaphragm form a gas cavity, the gas cavity is connected with the compressed gas supply source in gas circuit; a second recess is formed on the clamping surface of the second clamping plate, the second recess and the diaphragm form a pressure wave conducting fluid cavity, and the second clamping plate is provided with a pressure wave conducting fluid flow channel communicating with the pressure wave conducting fluid cavity;

[0010] a compressed gas charging and discharging control module, the compressed gas charging and discharging control module is arranged on the gas circuit, and is used for controlling the charging and discharging of compressed gas into and out of the gas cavity.

[0011] Further, the first clamping plate is provided with a gas pipeline interface communicating with the gas cavity, the gas pipeline interface is located at the center position of the first recess, and a gas pipeline is connected to the gas pipeline interface, the gas pipeline is connected with the compressed gas supply source;

[0012] The pressure wave conducting fluid flow channel is located at the center position of the second recess.

[0013] Further, an annular gas channel is formed in the first recess, the annular gas channel takes the gas pipeline interface as the center, and the annular gas channel communicates with the gas pipeline interface through a plurality of linear gas channels evenly formed in the first recess.

[0014] Furthermore, a first annular seal receiving groove is provided on the clamping surface of the first clamping plate. The first annular seal receiving groove is located at the periphery of the first groove. A seal that is sealed to the diaphragm is provided in the first annular seal receiving groove.

[0015] Furthermore, the second groove is a groove with a large mouth and a small bottom with a smooth transition.

[0016] Furthermore, a second annular seal receiving groove is provided on the clamping surface of the second clamping plate. The second annular seal receiving groove is located at the periphery of the second groove. A seal that is sealed to the diaphragm is provided in the second annular seal receiving groove.

[0017] Furthermore, the first clamping plate is provided with a first pressure sensor interface communicating with the gas chamber, and the first pressure sensor interface is provided with a pressure sensor for monitoring the pressure in the gas chamber;

[0018] The second clamping plate is provided with a second pressure sensor interface communicating with the pressure wave conduction fluid chamber. The second pressure sensor interface is provided with a pressure sensor for monitoring the pressure in the pressure wave conduction fluid chamber.

[0019] Furthermore, the compressed gas filling and exhaust control module includes a solenoid valve and a controller. The solenoid valve is installed on the gas path. The controller controls the solenoid valve to realize the filling and exhaust of compressed gas into and out of the gas chamber.

[0020] Furthermore, a pressure reducing valve is provided on the gas line.

[0021] A method for using a diaphragm-type pressure wave generator driven by compressed gas, comprising:

[0022] S1. Controlling the compressed gas filling and exhaust control module so that compressed gas in the compressed gas supply source is filled into the gas cavity formed by the first groove and the diaphragm, and the diaphragm is deformed toward the pressure wave conducting fluid cavity formed by the second groove and the diaphragm. The deformation of the diaphragm impacts the pressure wave conducting fluid in the pressure wave conducting fluid cavity to excite a pressure wave, which is then conducted through the pressure wave conducting fluid flow channel.

[0023] S2. Controlling the compressed gas filling and exhaust control module to discharge the compressed gas in the gas cavity formed by the first groove and the diaphragm, thereby resetting the diaphragm and ending the pressure wave excitation;

[0024] S3. Repeat S1 to S2 according to the set cycle.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The present invention provides a diaphragm-type pressure wave generator driven by compressed gas. By controlling the compressed gas filling and exhaust control module, the compressed gas in the compressed gas supply source is filled into the gas cavity formed by the first groove and the diaphragm, that is, the gas cavity is pressurized by the compressed gas filling and exhaust control module. The huge pressure difference on both sides of the diaphragm causes the diaphragm to deform rapidly into the pressure wave conduction fluid cavity formed by the second groove and the diaphragm, and impacts the fluid in the pressure wave conduction fluid cavity to excite pressure waves. The pressure waves are conducted to the fluid pipeline to be detected through the pressure wave conduction fluid flow channel; then, by controlling the compressed gas filling and exhaust control module, the compressed gas in the gas cavity formed by the first groove and the diaphragm is discharged, that is, the gas cavity is depressurized by the compressed gas filling and exhaust control module. The diaphragm resets and rebounds under the action of the pressure difference, and the pressure wave excitation ends, thereby controlling the excitation frequency and waveform of the pressure wave. The present invention utilizes gas to impact the diaphragm to generate deformation, thereby exciting single or continuous pulse pressure fluctuations, and propagating the pressure wave along the pipeline through the fluid flow channel. It effectively solves the problems of poor coupling between the existing pipeline pressure wave generator and the pipeline and inconvenient operation. It has a simple structure and reasonable design, a very compact structure, a small size and is easy to carry. Experimental tests have shown that the pressure wave generator can generate stable pressure fluctuations with high pressure wave amplitude, controllable excitation frequency, stable operation, and can meet the needs of pipeline detection.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of a diaphragm-type pressure wave generator driven by compressed gas in use according to an embodiment of the present invention;

[0030] Figure 2 This is a three-dimensional schematic diagram of a pressure wave generating assembly and a base in a diaphragm-type pressure wave generator driven by compressed gas according to an embodiment of the present invention;

[0031] Figure 3 This is a cross-sectional view of the structure of a pressure wave generating assembly in a diaphragm-type pressure wave generator driven by compressed gas according to an embodiment of the present invention;

[0032] Figure 4 Figure 2 is a top view (a) and a bottom view (b) of a second clamping plate of a pressure wave generating assembly in a diaphragm type pressure wave generator driven by compressed gas according to an embodiment of the present application;

[0033] Figure 5 Figure 2 is a top view (a) and a bottom view (b) of a second clamping plate of a pressure wave generating assembly in a diaphragm type pressure wave generator driven by compressed gas according to an embodiment of the present application;

[0034] Figure 6 Figure 3 is a schematic diagram of a controller output voltage in a diaphragm type pressure wave generator driven by compressed gas according to an embodiment of the present application;

[0035] Figure 7 Figure 4 is a pressure time-domain diagram of a pressure wave conducting fluid cavity (liquid section) and a gas cavity (gas section) when the inflation pressure is 400 kPa and the excitation frequency is 1 Hz according to an embodiment of the present application;

[0036] Figure 8 Figure 5 is a pressure time-domain diagram of a pressure wave conducting fluid cavity (liquid section) and a gas cavity (gas section) when the inflation pressure is 200 kPa and the excitation frequency is 2 Hz according to an embodiment of the present application;

[0037] Figure 9 Figure 6 is a pressure time-domain diagram of a pressure wave conducting fluid cavity (liquid section) and a gas cavity (gas section) when the inflation pressure is 500 kPa and the excitation frequency is 10 Hz according to an embodiment of the present application.

[0038] In the figure:

[0039] 1 - compressed gas supply source;

[0040] 2 - pressure wave generating assembly; 20 - first clamping plate; 200 - first recess; 2000 - annular air passage; 2001 - linear air passage; 201 - gas pipeline interface; 202 - first annular sealing element accommodating groove; 203 - first pressure sensor interface; 21 - second clamping plate; 210 - second recess; 211 - pressure wave conducting fluid flow channel; 212 - second annular sealing element accommodating groove; 213 - second pressure sensor interface; 22 - diaphragm;

[0041] 3 - compressed gas inflation and discharge control module; 30 - electromagnetic valve; 31 - controller;

[0042] 4 - gas pipeline; 5 - pressure reducing valve; 6 - bolt hole; 7 - fluid pipeline to be detected;

[0043] 8 - base; 80 - support frame; 81 - workbench;

[0044] 9 - computer. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] like Figure 1 As shown in FIG, a diaphragm type pressure wave generator driven by compressed gas in an embodiment of the present invention comprises a compressed gas supply source 1, a pressure wave generating component 2 and a compressed gas filling and exhausting control module 3. Figure 2 and Figure 3 As shown, the pressure wave generating assembly 2 includes a first clamping plate 20 and a second clamping plate 21 that are arranged opposite to each other, and a diaphragm 22 that is sealed and clamped between the first clamping plate 20 and the second clamping plate 21. Figure 1 、 Figure 3 and Figure 5 As shown, a first groove 200 is provided on the clamping surface of the first clamping plate 20. The first groove 200 and the diaphragm 22 form a gas chamber. The gas chamber is connected to the compressed gas supply source 1. The compressed gas filling and exhaust control module 3 is provided on the gas circuit to control the filling and exhaust of compressed gas into and out of the gas chamber. Figure 3 and Figure 4 As shown, a second groove 210 is provided on the clamping surface of the second clamping plate 21 , and the second groove 210 and the diaphragm 22 form a pressure wave conduction fluid cavity. A pressure wave conduction fluid flow channel 211 communicating with the pressure wave conduction fluid cavity is provided on the second clamping plate 21 .

[0047] In other words, the first surface of the first clamping plate 20 and the first surface of the second clamping plate 21 are positioned opposite each other. The first surface of the diaphragm 22 is in sealing contact with the first surface of the first clamping plate 20, and the second surface of the diaphragm 22 is in sealing contact with the first surface of the second clamping plate 21. A first groove 200 is defined on the first surface (i.e., the clamping surface) of the first clamping plate 20. The first groove 200 and the first surface of the diaphragm 22 form a gas chamber. A second groove 210 is defined on the first surface (i.e., the clamping surface) of the second clamping plate 21. The second groove 210 and the second surface of the diaphragm 22 form a pressure wave transmission fluid chamber. A fluid flow channel 211 is provided on the second surface of the second clamping plate 21, communicating with the pressure wave transmission fluid chamber. In other words, the diaphragm 22 separates the compressed gas from the pressure wave transmission fluid.

[0048] It should be noted that the first and second surfaces of the first splint 20 are opposite side surfaces on the first splint 20 , the first and second surfaces of the second splint 21 are opposite side surfaces on the second splint 21 , and the first and second surfaces of the diaphragm 22 are opposite side surfaces on the diaphragm 22 .

[0049] It should also be noted that the fluid in the pressure wave transmission fluid chamber can be liquid or gas. Furthermore, it should be understood that the fluid in the pressure wave transmission fluid chamber is the fluid in the fluid pipeline to be detected.

[0050] Specifically, the working principle of the diaphragm-type pressure wave generator driven by compressed gas in this embodiment is as follows:

[0051] First, the compressed gas filling and exhaust control module 3 is controlled so that the compressed gas in the compressed gas supply source 1 is filled into the gas chamber formed by the first groove 200 and the diaphragm 22. That is, the compressed gas filling and exhaust control module 3 can increase the pressure in the gas chamber, forming a huge pressure difference on both sides of the diaphragm 22 (the pressure on the gas chamber side is much greater than the pressure in the pressure wave transmission fluid chamber). The diaphragm 22 deforms into the pressure wave transmission fluid chamber formed by the second groove 210 and the diaphragm 22. The deformation of the diaphragm 22 impacts the pressure wave transmission fluid in the pressure wave transmission fluid chamber to excite a pressure wave, which is then transmitted through the pressure wave transmission fluid flow channel 211.

[0052] Next, the compressed gas filling and exhaust control module 3 is controlled to discharge the compressed gas in the gas chamber formed by the first groove 200 and the diaphragm 22. That is, the compressed gas filling and exhaust control module 3 can relieve the pressure in the gas chamber. The diaphragm 22 returns to its original position and rebounds under the action of the pressure difference, and the pressure wave excitation ends.

[0053] Finally, the above operation is repeated according to a set cycle, that is, the compressed gas is periodically filled into the gas chamber and the compressed gas in the gas chamber is discharged, thereby changing the frequency and waveform of the pressure wave.

[0054] As a specific example, the diaphragm 22 can be made of a single or composite material with good elasticity, including but not limited to rubber, metal, etc., so that the pressure of the gas chamber can be fully transmitted to the pressure wave conduction fluid chamber; the shape of the diaphragm 22 can be a regular oblate shape, or a disc shape or partially formed; the thickness and shape of the diaphragm 22 can be selected and adjusted according to the working pressure of the fluid pipeline 7 to be detected.

[0055] In one embodiment, combining Figure 1 、 Figure 3 and Figure 5 As shown, the first clamping plate 20 is provided with a gas pipeline interface 201 connected to the gas chamber (that is, the gas pipeline interface 201 is provided on the second surface of the first clamping plate 20). The gas pipeline interface 201 is located at the center of the first groove 200. The gas pipeline interface 201 is connected to the gas pipeline 4, and the gas pipeline 4 is connected to the compressed gas supply source 1. Figure 1 、 Figure 3 and Figure 4 As shown, the pressure wave conducting fluid channel 211 is located at the center of the second groove 210.

[0056] Specifically, the gas pipeline interface 201 is used to facilitate the quick assembly and disassembly of the compressed gas supply source 1 and the first clamping plate 20. The gas pipeline interface 201 is arranged at the center of the first groove 200, and the advantage of this design is that when the compressed gas is introduced into the gas cavity, the impact pressure of the compressed gas on the diaphragm 22 is more uniform, thereby making the deformation of the diaphragm 22 uniform, and further making the excited pressure wave more stable. Similarly, the pressure wave conducting fluid channel 211 is arranged at the center of the second groove 210, which can make the excited pressure wave more balanced in outward transmission.

[0057] For example, the compressed gas supply source 1 can be a compressed gas cylinder, the gas pipeline interface 201 is provided with an internal thread, the gas pipeline 4 is provided with an external thread, and the gas pipeline interface 201 and the gas pipeline 4 are connected in threaded cooperation. Similarly, the pressure wave conducting fluid channel 211 is also provided with an internal thread, which is convenient for connecting with the pipeline to be detected.

[0058] On the basis of the above embodiment, as a more preferred embodiment, in combination with Figure 3 and Figure 5 As shown, the annular gas channel 2000 is arranged in the first groove 200, the annular gas channel 2000 has the gas pipeline interface 201 as the center, and the annular gas channel 2000 and the gas pipeline interface 201 are in communication through a plurality of linear gas channels 2001 evenly arranged in the first groove 200. For example, the width of the linear gas channel 2001 and the annular gas channel 2000 is 4 mm and 2 mm, respectively.

[0059] Through the above gas channel structure design, the gas can flow smoothly during the inflation process, the compressed gas entering the gas cavity can impact the diaphragm 22 more uniformly, and the uniformity of the deformation of the diaphragm 22 is further improved, and finally the stability of the excited pressure wave is further improved.

[0060] Specifically, the linear gas channel 2001 is arranged in a cross shape, and of course, the adjacent two linear gas channels 2001 can also be arranged at an angle of 60°.

[0061] In an embodiment, in combination with Figure 3 and Figure 5As shown in the drawings, a first annular sealing element accommodating groove 202 is formed on the clamping surface of the first clamping plate 20, and the first annular sealing element accommodating groove 202 is located at the periphery of the first groove 200. A sealing element is arranged in the first annular sealing element accommodating groove 202 and is in sealing contact with the diaphragm 22. The sealing element is used to seal the first surface of the diaphragm 22 and the first surface of the first clamping plate 20, thereby ensuring that the gas cavity does not leak. For example, the sealing element can be a rubber sealing ring.

[0062] As a preferred embodiment, as shown in the drawings, Figure 3 As shown in the drawings, the second groove 210 is a groove with a large opening and a small bottom and a smooth transition. The inner surface of the second groove 210 is smooth and flat, so that the diaphragm 22 can be closely attached to the inner surface of the second groove 210 during deformation, thereby generating a more stable pressure wave.

[0063] In an embodiment, as shown in the drawings, Figure 3 and Figure 4 As shown in the drawings, a second annular sealing element accommodating groove 212 is formed on the clamping surface of the second clamping plate 21, and the second annular sealing element accommodating groove 212 is located at the periphery of the second groove 210. A sealing element is arranged in the second annular sealing element accommodating groove 212 and is in sealing contact with the diaphragm 22. The sealing element is used to seal the second surface of the diaphragm 22 and the first surface of the second clamping plate 21, thereby ensuring that the fluid in the pressure wave conducting fluid cavity does not leak.

[0064] Preferably, as shown in the drawings, Figure 1 , Figure 3 and Figure 5 A first pressure sensor interface 203 is arranged on the first clamping plate 20 and is in communication with the gas cavity. A pressure sensor is arranged in the first pressure sensor interface 203 and is used to monitor the pressure in the gas cavity, i.e., the pressure sensor is used to monitor the pressure change in the gas cavity during the generation of the pressure wave. For example, an internal thread is formed in the first pressure sensor interface 203, which facilitates the installation of the pressure sensor.

[0065] Similarly, as shown in the drawings, Figure 1 , Figure 3 and Figure 4 A second pressure sensor interface 213 is arranged on the second clamping plate 21 and is in communication with the pressure wave conducting fluid cavity. A pressure sensor is arranged in the second pressure sensor interface 213 and is used to monitor the pressure in the pressure wave conducting fluid cavity, i.e., the pressure sensor is used to monitor the pressure change in the pressure wave conducting fluid cavity during the generation of the pressure wave. For example, an internal thread is formed in the second pressure sensor interface 213, which facilitates the installation of the pressure sensor.

[0066] In an embodiment, as shown in the drawings, Figure 1As shown, the compressed gas charging and discharging control module 3 comprises an electromagnetic valve 30 and a controller 31. The electromagnetic valve 30 is installed on the gas path and is connected to the controller 31 through wires. As shown in Figure 6 As shown, the controller 31 can control the opening and closing of the internal gas passage of the electromagnetic valve 30 by setting the high and low of the output voltage and switching the frequency, that is, by controlling the electromagnetic valve 30 through the controller 31 to realize the charging and discharging of the compressed gas into the gas cavity.

[0067] Specifically, the electromagnetic valve 30 is installed on the gas pipeline 4, the gas cavity is connected to the first end of the electromagnetic valve 30 through the gas pipeline interface 201, the second end of the electromagnetic valve 30 is connected to the gas pipeline 4, and the third end of the electromagnetic valve 30 is connected to the low-pressure gas tank or directly connected to the environment, which is determined by the working pressure in the fluid pipeline to be detected. When it is needed to charge the compressed gas into the gas cavity, the controller 31 controls the first end and the second end of the electromagnetic valve 30 to be in conduction; when it is needed to discharge the compressed gas in the gas cavity, the controller 31 controls the first end and the third end of the electromagnetic valve 30 to be in conduction to complete the discharging. Specifically, the electromagnetic valve 30 adopts a two-position three-way electromagnetic valve.

[0068] It should be noted that the controller 31 sets the pulse voltage through the programmable logic controller, loads it to the electromagnetic valve 30 through the amplification circuit composed of Darlington triode and relay, and the gas passage between the first end and the second end of the electromagnetic valve 30 is opened when the high voltage is output, and the gas passage between the first end and the second end of the electromagnetic valve 30 is closed when the low voltage is output.

[0069] More preferably, a pressure reducing valve 5 is installed on the gas pipeline 4 to set the pressure of the compressed gas charged into the gas cavity, and the maximum amplitude of the pressure wave can be changed by adjusting the back pressure of the pressure reducing valve 5.

[0070] In an embodiment, a plurality of bolt holes 6 are formed on the first clamping plate 20 and the second clamping plate 21, for example, 4 to 8 bolts are formed, the first clamping plate 20 and the second clamping plate 21 are fixedly connected by penetrating the bolt holes 6 with bolts, and when the diaphragm 22 needs to be replaced, it is convenient to disassemble and replace.

[0071] Preferably, in combination with Figure 1 and Figure 2 As shown, the diaphragm type pressure wave generator further comprises a base 8, the base 8 comprises a support frame 80 and a workbench 81, the support frame 80 is fixedly connected to the pressure wave generating assembly 2 through bolts, and the workbench 81 is used to place the controller 31 and other related components. It should be understood that the shape and size of the base 8 can be adjusted accordingly according to the specific working environment.

[0072] As shown in Figure 1As shown, more specifically, when using the diaphragm type pressure wave generator of the present invention, the pressure wave conducting fluid flow channel 211 is connected to the fluid pipeline to be detected 7. When the pressure wave is generated, the pressure wave is conducted to the fluid pipeline to be detected 7 through the pressure wave conducting fluid flow channel 211. The pressure signal is collected by the pressure wave generating component 2 and the pressure sensor installed on the fluid pipeline to be detected 7. The collected pressure signal is transmitted to the computer 9 through the acquisition card. By filtering the data and extracting the time-frequency domain features, the diagnosis and positioning of the abnormal state of the fluid pipeline to be detected 7 are completed.

[0073] Combine Figure 4 and Figure 5 As shown, both the first and second plates 20, 21 are circular. When designing the structure of the first plate 20, the height and radius of the first groove 200 are preset, and the volume of the gas chamber is calculated. The flow rate change and duration of the inflation process are calculated based on the inflation pressure and the operating pressure of the fluid pipeline 7 to be tested. A theoretical optimal inflation duration is set, and the height and radius of the first groove 200 are adjusted based on this duration. The structure and volume of the gas chamber can be adjusted as needed. By setting the theoretical inflation time and combining the operating pressure and inflation pressure of the fluid pipeline to be tested, the volume and size of the gas chamber can be modified to achieve optimal coupling with the fluid pipeline to be tested.

[0074] For example, the theoretical optimal inflation time is set to be approximately 100 ms, and based on this time, the height and radius of the first groove 200 are designed to be 2 mm and 50 mm, respectively.

[0075] For example, the diaphragm 22 is a circular rubber diaphragm with a thickness of 1 mm.

[0076] Regarding the structure of the second groove 210, for example, the inner surface of the second groove 210 is designed to be a smooth curved surface, and its profile equation is:

[0077]

[0078] Where, is the longitudinal height of the inner surface curve of the second groove, The theoretical maximum longitudinal height set for the second groove inner surface curve, h m =12 mm, is the circumferential radius of the inner surface of the second groove, is the radius of the fluid pipeline to be tested, is the radius of the pressure wave conducting fluid cavity, R c =50 mm, is the radius of the second splint, To avoid calculation errors, the minimum value is set. .

[0079] See also Figure 1 、 Figure 6 and Figure 7 As shown, in one embodiment, when a diaphragm-type pressure wave generator driven by compressed gas is used for pipeline inspection, the working principle is as follows:

[0080] Step 1: Turn on the controller 31 to power the solenoid valve 30, and the solenoid valve 30 starts to work. The pressure sensor is used to collect pressure data in the pressure wave generating component 2 and the fluid pipeline 7 to be detected;

[0081] Step 2: Open the valve of the compressed gas supply source 1 (compressed gas cylinder), adjust the opening of the pressure reducing valve 5 so that the outlet pressure reaches the set value, and the compressed gas enters the solenoid valve 30 through the gas pipeline 4; when the controller 31 outputs a high voltage, the internal airway of the solenoid valve 30 opens, the compressed gas enters the gas chamber, and the pressure in the chamber increases rapidly. The diaphragm 22 deforms rapidly under the pressure difference on both sides and impacts the fluid in the pressure wave transmission fluid chamber, thereby generating a pulse pressure wave that propagates through the pressure wave transmission fluid channel 211 to the fluid pipeline 7 to be tested; when the controller 31 outputs a low voltage, the internal airway of the solenoid valve 30 closes, the high-pressure gas in the gas chamber is discharged into the low-pressure gas tank or the atmosphere through the solenoid valve 30, and the diaphragm 22 resets, waiting for the next pressure wave excitation cycle;

[0082] Step 3: Close the valve of the compressed gas supply source 1, switch the control program of the controller 31 to change the cycle of the output voltage, open the valve of the compressed gas supply source 1 again, and adjust the opening of the pressure reducing valve 5 so that the outlet pressure reaches the set value. The pressure setting value can be different from the previous one. Through this process, the excitation frequency, waveform and amplitude of the pressure wave can be adjusted to meet the needs of the fluid pipeline 7 to be tested.

[0083] The following pipeline test proves that the diaphragm type pressure wave generator of the present invention can generate pressure waves with controllable frequency and amplitude that meet the detection requirements. Figure 7 As shown, through the setting of the controller 31 program, when the inflation pressure is set to 400 kPa and the airway switching frequency of the solenoid valve 30 is 1 Hz, the pressure wave frequency is 1 Hz, and the pressure wave amplitude reaches about 420 kPa; Figure 8 As shown in , when the inflation pressure is set to 200 kPa and the airway switching frequency of the solenoid valve 30 is 2 Hz, the pressure wave frequency is 2 Hz, and the pressure wave amplitude reaches about 195 kPa; Figure 9 As shown in FIG, when the inflation pressure is set to 500 kPa and the airway switching frequency of the solenoid valve 30 is 10 Hz, the pressure wave frequency is 10 Hz and the pressure wave amplitude reaches about 110 kPa.

[0084] The diaphragm-type pressure wave generator driven by compressed gas in the present invention has good overall sealing performance, stable operation, convenient portability, easy operation, high human-computer interactivity and friendliness, and is convenient for regular disassembly, inspection, and installation.

[0085] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0087] In the present invention, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can mean fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0088] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0089] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. Exemplary representations of the above terms in this specification are not necessarily directed to the same embodiment or example. Moreover, the described particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in this specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0090] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, and are not limiting. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some technical features. The modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A diaphragm-type pressure wave generator driven by compressed gas, characterized in that: include: Compressed gas supply source (1); A pressure wave generating assembly (2), the pressure wave generating assembly (2) comprising a first clamping plate (20) and a second clamping plate (21) arranged opposite to each other, and a diaphragm (22) sealingly clamped between the first clamping plate (20) and the second clamping plate (21); a first groove (200) is provided on the clamping surface of the first clamping plate (20), the first groove (200) and the diaphragm (22) forming a gas chamber, the gas chamber being connected to the compressed gas supply source (1) gas path; a second groove (210) is provided on the clamping surface of the second clamping plate (21), the second groove (210) and the diaphragm (22) forming a pressure wave conduction fluid chamber, the second clamping plate (21) being provided with a pressure wave conduction fluid flow channel (211) communicating with the pressure wave conduction fluid chamber; The first clamping plate (20) is provided with a gas pipeline interface (201) in communication with the gas chamber, the gas pipeline interface (201) is located at the center of the first groove (200), the gas pipeline (4) is connected to the gas pipeline interface (201), and the gas pipeline (4) is connected to the compressed gas supply source (1); The pressure wave conduction fluid flow channel (211) is located at the center of the second groove (210); An annular air channel (2000) is provided in the first groove (200), the annular air channel (2000) having the gas pipeline interface (201) as its center, and the annular air channel (2000) is connected to the gas pipeline interface (201) via a plurality of linear air channels (2001) uniformly distributed in the first groove (200); A compressed gas filling and exhaust control module (3) is provided on the gas path and is used to control the filling and exhaust of compressed gas into and out of the gas chamber.

2. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: A first annular seal receiving groove (202) is provided on the clamping surface of the first clamping plate (20), the first annular seal receiving groove (202) is located outside the first groove (200), and a seal is provided in the first annular seal receiving groove (202) for sealing against the diaphragm (22).

3. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: The second groove (210) is a groove with a large mouth and a small bottom and a smooth transition.

4. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: A second annular seal receiving groove (212) is provided on the clamping surface of the second clamping plate (21), the second annular seal receiving groove (212) is located outside the second groove (210), and a seal is provided in the second annular seal receiving groove (212) to seal against the diaphragm (22).

5. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: The first clamping plate (20) is provided with a first pressure sensor interface (203) in communication with the gas chamber, and the first pressure sensor interface (203) is provided with a pressure sensor for monitoring the pressure in the gas chamber; The second clamping plate (21) is provided with a second pressure sensor interface (213) in communication with the pressure wave conduction fluid chamber, and the second pressure sensor interface (213) is provided with a pressure sensor for monitoring the pressure in the pressure wave conduction fluid chamber.

6. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: The compressed gas filling and exhaust control module (3) comprises a solenoid valve (30) and a controller (31), wherein the solenoid valve (30) is installed on the gas path, and the controller (31) controls the solenoid valve (30) to realize the filling and exhaust of compressed gas into and from the gas chamber.

7. The diaphragm-type pressure wave generator driven by compressed gas according to claim 1, characterized in that: A pressure reducing valve (5) is provided on the gas path.

8. The method for using a diaphragm-type pressure wave generator driven by compressed gas according to any one of claims 1 to 7, characterized in that: include: S1, controlling the compressed gas filling and exhaust control module (3) so that the compressed gas in the compressed gas supply source (1) is filled into the gas cavity formed by the first groove (200) and the diaphragm (22), the diaphragm (22) is deformed into the pressure wave conduction fluid cavity formed by the second groove (210) and the diaphragm (22), the deformation of the diaphragm (22) impacts the pressure wave conduction fluid in the pressure wave conduction fluid cavity to excite a pressure wave, and the pressure wave is conducted through the pressure wave conduction fluid flow channel (211); S2, controlling the compressed gas filling and exhaust control module (3) to discharge the compressed gas in the gas chamber formed by the first groove (200) and the diaphragm (22), resetting the diaphragm (22), and ending the pressure wave excitation; S3. Repeat S1 to S2 according to the set cycle.

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