Differential pressure triggered acoustic pig for alarm

Abstract

The application relates to the technical field of pipeline pigging and ball collecting operation safety early warning, and particularly discloses a differential pressure trigger type acoustic alarm pig, which comprises a cylinder body, a sound production assembly and a sound wave amplifier which are fixedly arranged in the cylinder body and sequentially distributed along the airflow direction; the sound wave amplifier is divided into a horn part and a long handle part according to the structure, and the horn part comprises a first narrow opening and a first wide opening; an airflow channel is arranged in the sound production assembly, and a vibrating reed is arranged on the airflow channel; the long handle part is fixedly communicated with the port of the airflow channel; and the application further comprises a flow guide cover which extends to the outside of the cylinder body and is fixedly arranged on the first wide opening. The application monitors the abnormal flow velocity in oil and gas transmission through structural design, that is, the flow velocity abnormality is converted into audio frequency so as to be acquired by a detection system and early warning is carried out.

Description

Technical Field

[0001] This invention relates to a safety early warning system for pipeline cleaning and pig collection operations, specifically to a differential pressure triggered acoustic alarm pig. Background Technology

[0002] As a core piece of equipment in oil and gas pipeline operation and maintenance, the safety of pig retrieval operations has long been a technical challenge in the pipeline engineering field. Because the pig is completely embedded within the oil and gas pipeline, it uses a pressure-filled contact cup to inject gas pressure into the initial section. Under the pressure of this gas, the pig moves towards the terminal section. The pig's moving speed is highly dependent on the gas pressure injected into the pipeline.

[0003] During the process, because the pig is completely inside the pipeline, its exact location is difficult to see or determine. The speed can only be judged by the input gas pressure. When it reaches the termination position (referred to as "entry point" by those skilled in the art), due to the predetermined pressure inside the pipeline, when the oil and gas pipeline cap is opened, the residual gas pressure in the pipeline will cause the pig to fly out directly and quickly, resulting in accidental injury to personnel.

[0004] The existing solution references a Chinese authorized patent, publication number CN116774150B, which discloses a tracking and positioning system for detectors and pigs in oil and gas pipelines. This system is mainly used to locate the pig, and its purpose is to allow the movement path of the pig located in the oil and gas pipeline to be observed, thereby determining the location of the pig.

[0005] In the prior art, including the aforementioned patent, the movement and positioning of the pig are determined by monitoring the sound source signals during its movement. However, due to the complexity of the environment, other external sound source signals can also cause interference, affecting the system's positioning. Therefore, it is necessary to improve the pig to generate composite sound source signals so that the system can accurately capture them. Furthermore, these composite sound source signals can be recognized by the human ear, increasing the safety factor during operation and further ensuring the personal safety of the personnel. Summary of the Invention

[0006] The purpose of this invention is to provide a differential pressure triggered acoustic alarm pig to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a differential pressure triggered acoustic alarm pigging device, comprising a cylinder, wherein a sound-generating component and an acoustic amplifier are fixedly installed inside the cylinder in sequence along the airflow direction; The acoustic amplifier is divided into a horn section and a long handle section according to its structure. The horn section includes a first narrow opening and a first wide opening. The sound-generating component has an airflow channel and a vibrating plate arranged on the airflow channel, and the long handle is fixedly connected to the port of the airflow channel. It also includes a flow guide shroud that extends to the outside of the cylinder and is fixedly installed on the first wide opening.

[0008] Preferably, the circumferential radius of the long handle decreases from the first end, which communicates with the horn portion, to the second end.

[0009] Preferably, the device also includes a leather cup, the number of which is not less than three, which is fitted onto the outer wall of the cylinder and fixed to the side diameter plate of the outer wall of the cylinder by bolts.

[0010] Preferably, the air guide is an arc-shaped structure with multiple vent holes arranged in a circular array, and the vent holes are elliptical in shape.

[0011] Preferably, the sound-generating component includes a first circular sealing portion and a second circular sealing portion that are connected in a side-contact manner; The airflow channel includes: A conical gas collecting groove is formed on the end face of the first circular sealing part facing the outer side of the cylinder; A bypass air passage is provided eccentrically inside the first circular sealing part and its first end is connected to the conical air collecting groove. A second vent is centrally located on the second circular sealing part.

[0012] Preferably, the vibrating plate is distributed between the first circular sealing part and the second circular sealing part, and covers the second air outlet port on the first circular sealing part.

[0013] Preferably, the airflow channel further includes: A submerged groove is formed on one end face of the first circular sealing part and is coaxial with and connected to the second air outlet. The annular groove formed on the second circular sealing part has a cross-section divided into an inclined part, a horizontal part and a vertical connecting groove according to the structure. The horizontal part is connected to the submerged groove through the vertical connecting groove, and the vertical connecting groove is distributed close to the inner wall of the submerged groove. A downward inclined connecting channel is formed on the second circular sealing part and connects the inclined part with the bypass air passage; The circumferential radius of the vibrating plate is larger than the circumferential radius of the submersible.

[0014] Preferably, the circumferential radius of the vibrating plate is greater than the circumferential radius of the groove on the second circular sealing part.

[0015] Preferably, the first circular sealing part is provided with a side wing exhaust hole, and the first end of the side wing exhaust hole is connected to the submersible groove; The sidewall of the first circular sealing part is stepped, and the second end of the side wing exhaust hole is connected to the inner wall of the cylinder.

[0016] Preferably, an upper pressure seal is fixedly installed on the cross-section of the cylinder port, and the upper pressure seal includes a sealing extension embedded at the junction of the flow guide and the cylinder.

[0017] Preferably, a first vent seat with one side in contact with the vibrating plate is fixedly installed inside the second vent hole; The first vent seat has a conical spiral channel, and the cross-sectional area of ​​the conical spiral channel increases from the first end to the second end, with the second end being close to the port of the second circular sealing part.

[0018] Preferably, the cross-section of the conical spiral channel is a long rectangle.

[0019] Preferably, a second vent seat is fixedly installed inside the second vent hole, and a first arc-shaped dome and a second arc-shaped dome with adjacent outer arc apexes are fixedly installed inside the air passage of the second vent seat. The output direction of the first end of the conical spiral channel is tangent to the inner wall of the second arc-shaped dome; The first and second arc-shaped domes are provided with ventilation holes arranged in a circumferential array and distributed near the sides.

[0020] Preferably, a rubber connecting cylinder is fixedly connected to one side of the first arc-shaped dome and the second arc-shaped dome. The second arc-shaped dome is a vertically sliding assembly, and the rubber connecting cylinder in the default state maximizes the distance between the first arc-shaped dome and the second arc-shaped dome.

[0021] Preferably, the rubber connecting cylinder has a spiral structure, and the spiral structure has one turn.

[0022] Preferably, the vibrating plate has multiple rectangular grooves arranged in a circumferential array, and each rectangular groove has springs distributed near the center of the rectangular groove on its inner walls on both sides.

[0023] Preferably, the cross-sections of the two springs located in the same rectangular groove are V-shaped, and the V-shape has a second narrow opening and a second wide opening, wherein the second narrow opening faces the second vent.

[0024] In the above technical solution, the differential pressure triggered acoustic alarm pig provided by the present invention has the following beneficial effects: when the transmission medium is pushed during the movement of the pig, part of it will pass through the cylinder in sequence, passing through the sound-generating component and the sound wave amplifier. When the transmission medium enters through the airflow channel and passes through the vibrating plate, it will then go along the long handle to the horn and then diffuse out through the guide shroud.

[0025] When the transmission medium reaches a predetermined speed, it becomes tangent to the vibrating plate, emitting an audio signal. This signal is then amplified by an acoustic amplifier, making it sufficient for the sensor to capture. This allows both the signal acquisition system and the human ear to clearly identify the signal and determine the location of the pig.

[0026] Secondly, after the pig enters the station, the transfer of the medium is stopped and a predetermined time is waited. Since the transfer medium will diffuse and be discharged through the guide shroud, the pressure at both ends of the pig will remain at a predetermined value. When the cover of the oil and gas pipeline is opened, the pig will not fly out and injure the staff due to the residual gas pressure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 Provided for embodiments of the present invention Figure 1 A schematic diagram of the exploded structure; Figure 3 A schematic diagram of the structure of the cylindrical body, acoustic amplifier, and sound-generating component provided in an embodiment of the present invention; Figure 4 Provided for embodiments of the present invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 A cross-sectional structural diagram of the first vent seat and the second vent seat provided in an embodiment of the present invention; Figure 7 A schematic diagram of the implementation state of the first arc-shaped dome and the second arc-shaped dome provided in the embodiments of the present invention; Figure 8 This is a schematic diagram of the structure of the vibrating plate, the second air outlet, and the submersible groove provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Cylinder body; 11. Side diameter plate; 2. Acoustic amplifier; 21. Horn section; 22. Long handle section; 3. Sound generating assembly; 31. First circular sealing section; 311. Conical air collection groove; 312. Submerged groove; 313. Bypass air passage; 314. Downward inclined connecting channel; 315. Side wing exhaust port; 32. Second circular sealing section; 321. Second air outlet; 322. Annular groove; 3221. Inclined section; 3222. Horizontal section; 3223. Vertical connecting groove; 4. Flow guide; 5. Bolt; 6. First vent seat; 61. Conical spiral channel; 7. Second vent seat; 71. First arc-shaped dome; 72. Second arc-shaped dome; 73. Vent hole; 74. Rubber connecting cylinder; 8. Leather cup; 9. Vibrating plate; 91. Rectangular groove; 92. Spring; 10. Pressure block; 20. Upper pressure seal. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1-8 As shown, a differential pressure triggered acoustic alarm pigging device includes a cylinder 1, inside which a sound-generating component 3 and an acoustic amplifier 2 are fixedly installed in sequence along the airflow direction. The acoustic amplifier 2 is divided into a horn section 21 and a long stem section 22 according to its structure. The horn section 21 includes a first narrow opening and a first wide opening. The sound-generating component 3 has an airflow channel and a vibrating plate 9 arranged on the airflow channel, and the long handle 22 is fixedly connected to the port of the airflow channel. It also includes a flow guide 4 whose outer arc apex extends to the outside of the cylinder 1 and is fixedly installed on the first wide opening.

[0033] Specifically, at least two side diameter plates 11 are symmetrically fixedly welded to the outer wall of the aforementioned cylinder 1, and the two side diameter plates 11 are distributed near the two end ports of the cylinder 1. Combined with... Figure 4 As shown, the top vertical end of the cylinder 1 is the output end of the transmission medium, and the bottom end is the input end. This example also includes at least three cups 8. The first cup 8 is inserted from the output end of the transmission medium, followed by the insertion of the pressure block 10, then the insertion of the second cup 8, and finally the upper pressure cap 20 is inserted into the port of the cylinder 1, abutting against the outer wall of the guide shroud 4 and the port section of the cylinder 1. Then the bolts 5 pass through the side diameter plate 11 and extend to the other side, and are finally fixed by the threaded connection of the nut.

[0034] The pressure block 10 is inserted through the input end of the transmission medium and then abuts against the side diameter plate 11. Next, the third cup 8 is inserted through the input end of the transmission medium and abuts against the pressure block 10. Finally, the bolt 5 is inserted through the side diameter plate 11, passing through and extending to the inner side of the third cup 8, and then secured with a threaded nut connection. (The transmission medium here is the medium that drives the pig to be pushed within the oil and gas pipeline, such as gas. The cup 8 is the actuator used to contact the inner wall of the oil and gas pipeline for cleaning.)

[0035] The aforementioned cylinder 1 is inserted into the pipe, and then deformed by the three rubber cups 8 against the inner wall of the pipe, thereby achieving a seal. Then, a screw passes through the threaded seat on the pipe, and its end abuts against the cylinder 1 for fixation.

[0036] Furthermore, the aforementioned pipeline is a pre-buried underground pipeline. The mechanical sound-generating structure provided in this embodiment is used in conjunction with an external sensor for detection. The corresponding detection method is described in publication number CN116774150B, which discloses a tracking and positioning system suitable for detectors and pigs inside oil and gas pipelines. Therefore, a detailed explanation is not provided.

[0037] Secondly, the aforementioned long handle 22 can be a straight tube structure.

[0038] Furthermore, the aforementioned air guide shroud 4 has an arc-shaped structure with multiple vent holes arranged in a circular array on its arc-shaped surface. These vent holes are elliptical in shape and are located within the inner ring of the upper pressure seal 20. This creates a relatively sealed space, allowing the audio signal emitted by the vibrating plate 9 to oscillate within this space, thereby amplifying it.

[0039] Furthermore, one end of the aforementioned vibrating plate 9 extends into the airflow channel, or the vibrating plate 9 is centrally arranged in the airflow channel, with both ends connected and held by a round rod, or any other vibrating plate 9 structural design known to those skilled in the art, so it will not be described in detail.

[0040] In the aforementioned technology, as the transmission medium passes through the cylinder 1, it sequentially passes through the sound-generating component 3 and the sound wave amplifier 2. The medium enters through the airflow channel and passes through the vibrating plate 9, then travels along the long handle 22 to the horn section 21, and is then diffused and discharged through the guide shroud 4. When the flow velocity of the transmission medium reaches a predetermined value, the medium is tangent to the vibrating plate 9, generating audio. This audio is then amplified by the sound wave amplifier 2, making it sufficient for the acquisition sensor to capture. This allows both the signal acquisition system and the human ear to clearly identify the location of the pig.

[0041] Secondly, after the pig enters the station, the transmission medium is stopped and a predetermined time is waited. Since the transmission medium will diffuse and be discharged through the flow guide 4, the pressure at both ends of the pig will remain at a predetermined value. When the cover of the oil and gas pipeline is opened, the pig will not fly out and injure the staff due to the residual gas pressure.

[0042] As a further embodiment of the present invention, combined with Figure 3 and Figure 4 As shown, the long handle 22 extends from the first end connected to the horn portion 21 to the second end, and its cross-sectional radius gradually decreases along the axial direction.

[0043] Specifically, the circumferential radius of the long handle 22 decreases from the first end to the second end, and the second end is the end of the long handle 22 that is connected to the output end of the sound-generating component 3. By using a method of varying circumferential radius, when the transmission medium is tangent to the vibrating plate 9 to generate audio, the audio enters the narrow end, that is, the end with the smallest circumferential radius, and then the audio enters the long handle 22 to oscillate, thereby maximizing the amplification of the audio entering the long handle 22 to the maximum limit that the structure can amplify.

[0044] As another embodiment of the present invention, the sound-generating component 3 includes a first circular sealing part 31 and a second circular sealing part 32 that are connected by side contact. The airflow channels include: A conical gas collecting groove 311 is formed on the end face of the first circular sealing part 31 facing the outer side of the cylinder 1; A bypass air passage 313 is eccentrically distributed inside the first circular sealing part 31 and its first end is connected to the conical air collecting groove 311; A second vent 321 is centrally located on the second circular sealing part 32; The vibrating plate 9 is distributed between the first circular sealing part 31 and the second circular sealing part 32, and covers the port of the second air outlet 321.

[0045] Specifically, the gas enters through the conical gas collecting groove 311, then flows along the bypass gas passage 313, and is discharged into the long handle 22 through the second gas outlet 321.

[0046] Combination Figure 8As shown, the vibrating plate 9 has multiple rectangular grooves 91 arranged in a circular array. Each rectangular groove 91 has two reeds 92 arranged near the center of its inner walls on opposite sides. The cross-sections of the two reeds 92 are V-shaped, with a second narrow opening and a second wide opening. The second narrow opening faces the second air outlet 321. That is, the airflow enters through the bypass air passage 313, then enters through the second wide opening and then through the second narrow opening. During this process, when the transmission medium reaches a predetermined value, the rapidly flowing transmission medium will cause the reeds 92 to vibrate at a high frequency, thereby generating an audio frequency.

[0047] As another embodiment further provided by the present invention, combined with Figure 4 and Figure 5 As shown, the airflow channel also includes: A groove 312 is formed on one end face of the first circular sealing part 31 and is coaxial with and connected to the second air outlet 321; The annular groove 322 opened on the second circular sealing part 32 has a cross section divided into an inclined part 3221, a horizontal part 3222 and a vertical connecting groove 3223 according to the structure. The horizontal part 3222 is connected to the submerged groove 312 through the vertical connecting groove 3223, and the vertical connecting groove 3223 is distributed close to the inner wall of the submerged groove 312. A downward inclined connecting channel 314 is provided on the second circular sealing part 32 and connects the inclined part 3221 with the bypass air passage 313; Among them, the circumferential radius of the vibrating plate 9 is larger than the circumferential radius of the submersible 312.

[0048] Specifically, in the above embodiment, the transmission medium entering through the bypass air passage 313 first enters the inclined section 3221 through the downward inclined connecting channel 314, and then directly impacts the second narrow opening of the vibrating plate 9 through the horizontal section 3222 and the vertical connecting groove 3223. The airflow then enters the submerged groove 312, enters through the second wide opening of the vibrating plate 9, and then through the second narrow opening of the vibrating plate 9. Because the second air outlet 321 is located inside the annular groove 322, the vibrating plate 9 is divided. That is, when the transmission medium enters the submerged groove 312 through the vertical connecting groove 3223, it is the first vibration sound-generating part; and when the transmission medium enters the second air outlet 321 through the submerged groove 312, it is the second vibration sound-generating part. In other words, during the flow of the transmission medium, when the flow velocity reaches a predetermined value, both the first and second vibration sound-generating parts will occur, forming a special composite audio. Due to the special nature of this composite audio, the recognition rate is improved, meaning it is more easily and clearly identified by the adapted detection method.

[0049] As another embodiment further provided by the present invention, combined with Figure 5As shown, a side wing exhaust hole 315 is provided on the first circular sealing part 31, and the first end of the side wing exhaust hole 315 is connected to the submersible groove 312. The sidewall of the first circular sealing part 31 is stepped, and the second end of the side wing exhaust hole 315 is connected to the inner wall of the cylinder 1.

[0050] Specifically, the sidewall of the first circular sealing part 31 is stepped, with at least two steps. The first step contacts the inner wall of the cylinder 1, while the second step maintains a predetermined distance from the inner wall of the cylinder 1. The side wing exhaust port 315 in the embodiment is L-shaped, with one end extending to the outside of the second step, thereby communicating with the inner wall of the cylinder 1.

[0051] When the transmission medium flows here, it enters the space between the cylinder 1 and the acoustic amplifier 2 through the side exhaust port 315. Because this space is sealed, once the transmission medium reaches the predetermined volume, it will stop entering. The purpose is to increase the predetermined air pressure in this space, absorb high-frequency mechanical vibrations through gas damping, and avoid structural fatigue caused by the resonance of the acoustic amplifier 2.

[0052] As another embodiment further provided by the present invention, combined with Figure 6 As shown, a first vent seat 6 with one side in contact with the vibrating plate 9 is fixedly installed inside the second vent 321; The first vent seat 6 has a conical spiral channel 61, and the cross-sectional area of ​​the conical spiral channel 61 increases from the first end to the second end, with the second end close to the port of the second circular sealing part 32.

[0053] Furthermore, a second vent seat 7 is fixedly installed inside the second vent 321, and a first arc-shaped dome 71 and a second arc-shaped dome 72 with adjacent outer arc apexes are fixedly installed inside the air passage of the second vent seat 7. The output direction of the first end of the conical spiral channel 61 is tangent to the inner wall of the second arc-shaped dome 72; Ventilation holes 73 are arranged in a circumferential array and distributed near the sides on the first arc-shaped dome 71 and the second arc-shaped dome 72.

[0054] Furthermore, a rubber connecting cylinder 74 is fixedly connected to one side of the first arc-shaped dome 71 and the second arc-shaped dome 72. The rubber connecting cylinder 74 has a spiral structure, and the spiral structure has one turn. The second arc-shaped dome 72 achieves vertical sliding assembly through the cooperation of the guide part and the rectangular groove. In the default state, the rubber connecting cylinder 74 maximizes the distance between the first arc-shaped dome 71 and the second arc-shaped dome 72.

[0055] It should be noted that the cross-section of the aforementioned conical spiral channel 61 is a long rectangle, the purpose of which is to increase the cross-sectional coverage of the airflow output.

[0056] Specifically, when the gas enters the second outlet 321 through the second narrow opening of the vibrating plate 9, the transmission medium passes through the conical spiral channel 61, and then the flow rate is accelerated by the contraction of the conical spiral channel 61, which amplifies the impact force of the airflow.

[0057] The airflow through the conical spiral channel 61 flows along the inner arc of the second arc-shaped dome 72, and then through the vents 73 on the first and second arc-shaped domes 71, before entering the interior of the long handle 22. When the flow rate of the transmission medium increases abnormally, the airflow velocity through the conical spiral channel 61 also increases, resulting in a greater impact force.

[0058] Furthermore, in this embodiment, the second arc-shaped dome 72 achieves vertical sliding assembly through the cooperation of the guide portion and the rectangular groove. That is, the second vent seat 7 has rectangular grooves arranged in a circular pattern, and the outer wall of the second arc-shaped dome 72 is fixedly provided with guide portions located in the rectangular grooves with a clearance fit. The number of guide portions and rectangular grooves are in a one-to-one correspondence, so that the second arc-shaped dome 72 can only slide vertically when pushed by the impact force of the transmission medium.

[0059] The distance between the first arc-shaped dome 71 and the second arc-shaped dome 72 is maintained by a rubber connecting sleeve 74 that is fixed between them by glue or inlay. Figure 6 As shown, in the default state, the two ends of the cross-section of the rubber connecting cylinder 74 are convex structures, extending a predetermined distance along the vent holes 73 on the first arc-shaped dome 71 and the second arc-shaped dome 72. In this state, the vent holes 73 on the first arc-shaped dome 71 and the second arc-shaped dome 72 are coaxial, that is... Figure 7 As shown in (1).

[0060] When the second arc-shaped dome 72 slides vertically under the impact force of the transmission medium, because the rubber connecting cylinder 74 has a spiral structure with one turn, the upward movement of the second arc-shaped dome 72 causes the rubber connecting cylinder 74 to axially contract. This means the distance between the first arc-shaped dome 71 and the second arc-shaped dome 72 decreases. During this contraction, the rubber connecting cylinder 74 rotates along the spiral direction, causing the vent holes 73 on the first and second arc-shaped domes 71 and 72 to be misaligned. Figure 7As shown in (2). And because the rubber connecting cylinder 74 contracts axially, the outer radius of the convex structure on both sides of the rubber connecting cylinder 74 will increase, thereby blocking the vent holes 73 on the first arc-shaped dome 71 and the second arc-shaped dome 72, thus achieving an emergency seal. That is, when the sound emitted by the pig disappears, it prompts the staff that the input air pressure is too high (i.e., the pig moves too fast and needs to be slowed down), so that the input air pressure is adjusted until the emergency seal disappears, and the sound emitted by the pig reappears. The purpose of the above design is to ensure that the pig moves within a reasonable range, so as to avoid directly hitting the oil and gas pipeline cap when entering the station, causing damage, or flying out directly, so as to ensure safety in the entire operation process.

[0061] It should be noted that the rubber connecting cylinder 74 mentioned above uses silicone support, which has good deformation resistance and aging resistance, and such dangerous situations rarely occur. Therefore, the material properties of the rubber connecting cylinder 74 are suitable for use in the above-mentioned environment.

[0062] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A differential pressure triggered acoustic alarm pig, characterized in that, It includes a cylindrical body (1), inside which a sound-generating component (3) and a sound wave amplifier (2) are fixedly installed in sequence along the airflow direction. The acoustic amplifier (2) is divided into a horn section (21) and a long handle section (22) according to its structure. The horn section (21) includes a first narrow opening and a first wide opening. The sound-generating component (3) has an airflow channel and a vibrating plate (9) arranged on the airflow channel. The long handle (22) is fixedly connected to the port of the airflow channel. It also includes a flow guide (4) whose outer arc apex extends to the outside of the cylinder (1) and is fixedly installed on the first wide opening; The sound-generating component (3) includes a first circular sealing part (31) and a second circular sealing part (32) that are connected by side contact. The airflow channel includes: A conical gas collecting groove (311) is formed on the outer end face of the first circular sealing part (31) facing the outer side of the cylinder (1). A bypass air passage (313) is provided inside the first circular sealing part (31) and is eccentrically distributed, with its first end connected to the conical air collecting groove (311). A second vent (321) is centrally located on the second circular sealing part (32). The first circular sealing part (31) is provided with a side wing exhaust hole (315), and the first end of the side wing exhaust hole (315) is connected to the submersible groove (312); The sidewall of the first circular sealing part (31) is stepped, and the second end of the side wing exhaust hole (315) is connected to the inner wall of the cylinder (1); An upper pressure cover (20) is fixedly installed on the port section of the cylinder (1). The upper pressure cover (20) includes a sealing extension embedded at the junction of the flow guide (4) and the cylinder (1).

2. The differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The circumferential radius of the long handle (22) decreases from the first end, which is connected to the horn (21), to the second end.

3. The differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, It also includes a leather cup (8), which is no less than three in number, and is fitted onto the outer wall of the cylinder (1), and fixed to the side diameter plate (11) of the outer wall of the cylinder (1) by bolts (5).

4. The differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The air guide (4) has an arc-shaped structure with multiple vent holes arranged in a circular array, and the vent holes are elliptical in shape.

5. A differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The vibrating plate (9) is distributed between the first circular sealing part (31) and the second circular sealing part (32), and covers the port of the second air outlet (321) on the second circular sealing part (32).

6. A differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The airflow channel also includes: A groove (312) is formed on one side of the end face of the first circular sealing part (31) and is coaxial and connected with the second air outlet (321). The annular groove (322) opened on the second circular sealing part (32) has a cross section divided into an inclined part (3221), a horizontal part (3222) and a vertical connecting groove (3223) according to the structure. The horizontal part (3222) is connected to the submerged groove (312) through the vertical connecting groove (3223), and the vertical connecting groove (3223) is distributed close to the inner wall of the submerged groove (312). A downward inclined connecting channel (314) is provided on the second circular sealing part (32) and connects the inclined part (3221) with the bypass air passage (313). The circumferential radius of the vibrating plate (9) is greater than the circumferential radius of the submersible groove (312).

7. A differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The circumferential radius of the vibrating plate (9) is greater than the circumferential radius of the groove (312) on the second circular sealing part (32).

8. A differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, A first vent seat (6) with one side in contact with the vibrating plate (9) is fixedly installed inside the second vent (321); The first vent seat (6) has a conical spiral channel (61) inside, and the cross-sectional area of ​​the conical spiral channel (61) increases from the first end to the second end, with the second end close to the port of the second circular sealing part (32).

9. A differential pressure triggered acoustic alarm pig according to claim 8, characterized in that, The conical spiral channel (61) has a long rectangular cross section.

10. A differential pressure triggered acoustic alarm pig according to claim 8, characterized in that, A second vent seat (7) is fixedly installed inside the second vent hole (321), and a first arc-shaped dome (71) and a second arc-shaped dome (72) with adjacent outer arc apexes are fixedly installed inside the air passage of the second vent seat (7). The output direction of the first end of the conical spiral channel (61) is tangent to the inner wall of the second arc-shaped dome (72); The first arc-shaped dome (71) and the second arc-shaped dome (72) are provided with ventilation holes (73) arranged in a circular array and distributed close to the side.

11. A differential pressure triggered acoustic alarm pig according to claim 10, characterized in that, A rubber connecting cylinder (74) is fixedly connected to one side of the first arc-shaped dome (71) and the second arc-shaped dome (72). The second arc-shaped dome (72) is a vertically sliding assembly. In the default state, the rubber connecting cylinder (74) maximizes the distance between the first arc-shaped dome (71) and the second arc-shaped dome (72).

12. A differential pressure triggered acoustic alarm pig according to claim 11, characterized in that, The rubber connecting cylinder (74) has a spiral structure, and the spiral structure has one turn.

13. A differential pressure triggered acoustic alarm pig according to claim 1, characterized in that, The vibrating plate (9) has multiple rectangular grooves (91) arranged in a circular array, and each rectangular groove (91) has a spring (92) arranged close to the center of the rectangular groove (91) on its inner walls on both sides.

14. A differential pressure triggered acoustic alarm pigging device according to claim 13, characterized in that, The cross-sections of the two springs (92) located in the same rectangular groove (91) are V-shaped, and the V-shape has a second narrow opening and a second wide opening, wherein the second narrow opening faces the second vent (321).

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