Low pressure pipe controllable pressure oscillation generating device

Abstract

The application belongs to the technical field of hydraulic engineering, and particularly relates to a low-pressure pipeline controllable pressure oscillation generating device; the device comprises a pressure-energy conversion assembly, a pressure-energy conversion movement assembly and a slow-flow pressure regulating assembly; a linear cavity in the pressure-energy conversion assembly serves as a pressure-energy conversion chamber; the pressure-energy conversion movement assembly is slidingly and sealingly assembled in the pressure-energy conversion chamber, and the pressure-energy conversion chamber is divided into a front chamber and a rear chamber along the length direction; a flow discharge port is formed in the side surface of the front chamber; an elastic return mechanism is connected between the rear chamber and the pressure-energy conversion movement assembly; and the slow-flow pressure regulating assembly is located outside the pressure-energy conversion assembly; the low-pressure pipeline controllable pressure oscillation generating device has the following effects: 1. water flow is kept in a turbulent state in a low-pressure small-flow-rate pressure pipeline, so that solid suspended matters are prevented from depositing; 2. pressure oscillation is generated by using the self pressure in the pipeline, and no additional pressure oscillation excitation source is needed; and 3. the amplitude of the pressure wave is adjustable and controllable.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically relating to a controllable pressure oscillation generator for low-pressure pipelines. Background Technology

[0002] In low-pressure, low-flow-rate water pipelines, the water flow velocity is low, and suspended solids in the water easily settle at the bottom of the pipe, causing blockages and affecting the safe operation of the pipeline. To prevent the deposition of suspended solids in the water, the turbulence of the water flow must be increased. The traditional method is to increase the water flow velocity, but for low-flow, low-pressure pipelines, increasing the flow velocity is not feasible. Therefore, a device is needed to prevent the deposition of suspended solids in low-flow, low-pressure water pipelines. Summary of the Invention

[0003] This invention aims to solve the problem that the low water flow velocity in low-flow, low-pressure water pipelines makes it impossible to prevent the deposition of solid suspended matter.

[0004] This invention provides the following technical solution: a controllable pressure oscillation generator for low-pressure pipelines, comprising a pressure energy conversion component, a pressure energy conversion motion component, and a slow-flow pressure regulating component; The linear cavity inside the pressure energy conversion component serves as the pressure energy conversion chamber; the pressure energy conversion motion component is slidably and sealed within the pressure energy conversion chamber. The pressure energy conversion chamber is divided into a front chamber and a rear chamber along its length, with the baffle end of the pressure energy conversion motion component as the boundary. The front chamber is directly connected to the inlet of the pressure energy conversion component, and the rear chamber is equipped with a vent to connect to the atmosphere; a vent is opened on the side of the front chamber; and a spring-loaded reset mechanism is connected between the rear chamber and the pressure energy conversion motion component. The pressure energy conversion motion component can slide in the pressure energy conversion chamber under the fluctuation of fluid pressure in the front chamber and the energy release thrust of the elastic reset mechanism. The pressure energy conversion motion component can switch between completely blocking the vent and dynamically adjusting the opening range of the vent. The slow-flow pressure regulating component is located outside the pressure energy conversion component. The slow-flow pressure regulating component includes a slow-flow pressure regulating chamber that is connected to the discharge port. The outlet of the slow-flow pressure regulating chamber is offset from the discharge port.

[0005] Furthermore, a limiting body is installed in the front chamber to limit the maximum stroke of the pressure energy conversion motion component driven by the elastic reset mechanism. When the pressure energy conversion motion component stops at the limiting body, the outlet is completely blocked.

[0006] Furthermore, the elastic reset mechanism includes a guide rod, a spring, and a guide bracket; the guide rod is fixed on the center line of the pressure energy conversion motion component, and the guide rod is parallel to the length direction of the pressure energy conversion chamber; the guide bracket is fixed in the rear chamber, and the guide rod slides through the guide hole in the center of the guide bracket; the spring is sleeved on the guide rod and supports between the pressure energy conversion motion component and the guide bracket.

[0007] Furthermore, the slow-flow pressure regulating chamber is an annular cavity surrounding the pressure energy conversion component. The slow-flow pressure regulating chamber includes a conical ring section and a straight ring section. The small end of the conical ring section is located on the side of the discharge port, the large end of the conical ring section is aligned with the straight ring section, and the outlet is located on the side of the straight ring section away from the conical ring section.

[0008] Furthermore, the inlet of the pressure energy conversion component is connected to the pressure energy conversion chamber via a variable cross-section chamber, with the small end of the variable cross-section chamber aligned with the inlet and the large end of the variable cross-section chamber aligned with the pressure energy conversion chamber.

[0009] Furthermore, the cross-sections of the pressure energy conversion chamber, the variable cross-section chamber, and the slow-flow pressure regulating chamber are all circular, and their centerlines are located on the same axis; the centerline of the pressure energy conversion motion component is also located on this axis.

[0010] Furthermore, the slow-flow pressure regulating component is equipped with an opening adjustment device outside the outlet. The opening adjustment device can adjust the size of the outlet opening, thereby realizing the control and adjustment of the pressure wave amplitude and frequency.

[0011] Furthermore, the pressure energy conversion motion component includes a sleeve and a baffle. The sleeve is slidably nested in the pressure energy conversion chamber, and the baffle is connected to the sleeve and closes the opening of the sleeve.

[0012] Furthermore, sealing rings are fitted at both ends of the outer wall of the sleeve.

[0013] Compared with the prior art, the advantages of the present invention are: The present invention provides a controllable pressure oscillation generator for low-pressure pipelines, which has three advantages: first, it keeps the water flow in a turbulent state in a low-pressure, low-velocity pressurized pipeline to prevent the deposition of solid suspended matter; second, it uses the inherent pressure in the pipeline to generate pressure oscillations without the need for an additional pressure oscillation excitation source; and third, the amplitude of the pressure wave can be adjusted and controlled. Attached Figure Description

[0014] Figure 1 A schematic diagram of a controllable pressure oscillation generator for low-pressure pipelines; Figure 2 This is a schematic diagram of the combination of the pressure energy conversion component and the pressure energy conversion motion component. Figure 3 This is a schematic diagram of the combination of a pressure energy conversion component and a slow-flow pressure regulating component. Figure 4 This is a schematic diagram of a pressure energy conversion motion component; Figure 5 This is a schematic diagram showing the structural dimensions of each component of a low-pressure pipeline controllable pressure oscillation generator.

[0015] In the diagram: 1-Pressurized pipe; 2-Pressure energy conversion component; 2.1-Front chamber; 2.2-Rear chamber; 2.3-Inlet; 2.4-Breath port; 2.5-Drain port; 2.6-Baffle; 2.7-Variable cross-section chamber; 2.8-Blocking plate; 2.9-Straight cylinder shell; 2.10-Conical shell; 3-Pressure energy conversion motion component; 3.1-Guide rod; 3.2-Guide bracket; 3.3-Spring; 3.4-Baffle; 3.5-Sleeve; 3.6-Sealing ring; 4-Slow flow pressure regulating component; 4.1-Conical ring section; 4.2-Straight ring section; 4.3-Outlet; 4.4-Opening adjustment device; 4.5-Pressure regulating chamber shell. Detailed Implementation

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] like Figure 1 , Figure 2 , Figure 3 As shown: A controllable pressure oscillation generator for low-pressure pipelines includes a pressure energy conversion component 2, a pressure energy conversion motion component 3, and a slow-flow pressure regulating component 4.

[0018] The linear cavity within the pressure energy conversion component 2 serves as the pressure energy conversion chamber. The pressure energy conversion motion component 3 is slidably and sealed within this chamber, dividing it lengthwise into a front chamber 2.1 and a rear chamber 2.2, with the baffle 3.4 of the motion component 3 as the boundary. The motion component 3 slides back and forth within the chamber, dynamically adjusting the range of the front and rear chambers. The front chamber 2.1 is directly connected to the inlet 2.3 of the pressure energy conversion component 2. The rear chamber 2.2 is connected to the atmosphere via a vent 2.4. The volume change in the rear chamber 2.2 as the motion component 3 slides balances the air pressure within the rear chamber 2.2 through the vent 2.4. The inlet 2.3 of the pressure energy conversion component 2 is connected to a pressurized pipe 1, allowing pressurized water to enter or exit the pressure energy conversion component 2. Figure 1 The direction of the middle arrow indicates the initial direction of water flow in the pipe (the direction of water supply). A drain port 2.5 is opened on the side of the front chamber 2.1; the rear chamber 2.2 is connected to the pressure energy conversion motion component 3 by a spring-loaded reset mechanism.

[0019] The pressure energy conversion motion component 3 can slide within the pressure energy conversion chamber under the influence of the fluid pressure in the front chamber 2.1 and the energy release thrust fluctuation of the elastic reset mechanism. The pressure energy conversion motion component 3 can switch between completely blocking the drain port 2.5 and dynamically adjusting the opening range of the drain port 2.5.

[0020] A limiting body 2.6 is installed in the anterior chamber 2.1. The limiting body 2.6 is used to limit the maximum stroke of the elastic reset mechanism pushing the pressure energy conversion motion component 3. When the pressure energy conversion motion component 3 stops at the limiting body 2.6, the drain outlet 2.5 is completely blocked.

[0021] The elastic reset mechanism includes a guide rod 3.1, a spring 3.3, and a guide bracket 3.2. The guide rod 3.1 is fixed on the pressure energy conversion motion assembly 3, and the guide rod 3.1 is parallel to the length direction of the pressure energy conversion chamber. The guide bracket 3.2 is fixed inside the rear chamber 2.2, and the guide rod 3.1 slides through the guide hole of the guide bracket 3.2. The spring 3.3 is sleeved on the guide rod 3.1 and supports between the pressure energy conversion motion assembly 3 and the guide bracket 3.2.

[0022] When the pressure energy conversion motion component 3 slides in the pressure energy conversion chamber, its leftward movement is restricted by the limit body 2.6, and its rightward movement is restricted by the guide bracket 3.2. When it moves to the right, the spring 3.3 is compressed and stores energy, and when it moves to the left, the spring 3.3 releases energy, forming a thrust that causes the pressure energy conversion motion component 3 to move to the left as a whole.

[0023] The inlet 2.3 of the pressure energy conversion component 2 is connected to the pressure energy conversion chamber via the variable cross-section chamber 2.7. The small end of the variable cross-section chamber 2.7 is aligned with the inlet 2.3, and the large end of the variable cross-section chamber 2.7 is aligned with the pressure energy conversion chamber. When the low-pressure water flow in the pressurized pipeline 1 enters the pressure energy conversion component 2, it first passes through the variable cross-section chamber 2.7, increasing the cross-sectional area of ​​the pressure energy conversion chamber, that is, increasing the pressure-bearing area of ​​the pressure energy conversion moving component 3, and increasing the total water pressure it receives.

[0024] The pressure energy conversion assembly 2 includes a conical shell 2.10 and a straight shell 2.9. The inner cavity of the conical shell 2.10 is a variable cross-section chamber 2.7, and the inner cavity of the straight shell 2.9 is a pressure energy conversion chamber, including a front chamber 2.1 and a rear chamber 2.2. The small port of the conical shell 2.10 serves as an inlet 2.3, and the large port of the conical shell 2.10 is connected to one end of the straight shell 2.9. The other end of the straight shell 2.9 is connected to a sealing plate 2.8 for closure, and a vent 2.4 is opened on the sealing plate 2.8.

[0025] like Figure 4 As shown: The pressure energy conversion motion component 3 includes a sleeve 3.5 and a baffle 3.4. The sleeve 3.5 is slidably nested within the pressure energy conversion chamber. The baffle 3.4 is connected to the sleeve 3.5 and closes the opening of the sleeve 3.5. The baffle 3.4 is located on the end of the sleeve 3.5 facing the inlet 2.3. The guide rod 3.1 is perpendicularly connected to the baffle 3.4. Sealing rings 3.6 are fitted at both ends of the outer wall of the sleeve 3.5; the sealing rings 3.6 improve the sealing performance between the sleeve 3.5 and the pressure energy conversion chamber.

[0026] The slow-flow pressure regulating component 4 is located outside the pressure energy conversion component 2. The slow-flow pressure regulating component 4 includes a slow-flow pressure regulating chamber that communicates with the outlet 2.5. The outlet 4.3 of the slow-flow pressure regulating chamber is offset from the outlet 2.5, allowing pressurized fluid to be temporarily stored in the slow-flow pressure regulating chamber. When the pressure energy conversion motion component 3 is in motion, the outlet 2.5 connects the front chamber 2.1 of the pressure energy conversion component 2 and the slow-flow pressure regulating chamber of the slow-flow pressure regulating component 4 to form an intermittent communicating vessel.

[0027] An opening adjustment device 4.4 is installed on the slow flow pressure regulating component 4 outside the outlet 4.3. The opening adjustment device 4.4 can adjust the opening size of the outlet 4.3 and adjust the water flow rate of the outlet 4.3 so that the pressurized water flow can be temporarily stored and slowed in the slow flow pressure regulating chamber; at the same time, it can regulate the water pressure in the slow flow pressure regulating chamber in order to regulate the parameters (amplitude, frequency) of pressure oscillation.

[0028] The slow-flow pressure regulating chamber is an annular cavity surrounding the pressure energy conversion component 2. The chamber includes a conical annular section 4.1 and a straight annular section 4.2. The smaller end of the conical annular section 4.1 is located on one side of the outlet 2.5, and the larger end of the conical annular section 4.1 is aligned with the straight annular section 4.2. The outlet 4.3 is located on the straight annular section 4.2 on the side furthest from the conical annular section 4.1. The conical annular section 4.1 facilitates the discharge of solid sediments from the water flow through the outlet 4.3.

[0029] The slow-flow pressure regulating assembly 4 includes a pressure regulating chamber housing 4.5, which is connected to a straight cylinder housing 2.9 and a blocking plate 2.8 to form a slow-flow pressure regulating chamber.

[0030] like Figure 1 , Figure 2 , Figure 3 As shown: the cross-sections of the pressure energy conversion chamber, the variable cross-section chamber 2.7, and the slow-flow pressure regulating chamber are all circular, and their center lines are located on the same axis. The axial center lines of each component of the pressure energy conversion motion assembly 3 are also located on this axis.

[0031] like Figure 5 As shown: To ensure the normal operation of the controllable pressure oscillation generator for low-pressure pipelines, the axial length L5 of sleeve 3.5 must be greater than the sum of the axial length L4 of drain port 2.5 and the length L3 between drain port 2.5 and limit body 2.6 (so that sleeve 3.5 can completely block drain port 2.5); at the same time, the length L1 between limit body 2.6 and guide bracket 3.2 must be greater than twice the axial length L5 of sleeve 3.5 (to meet the movement distance requirement when sleeve 3.5 opens drain port 2.5); the length L2 between guide bracket 3.2 and blocking plate 2.8 must be greater than the axial length L5 of sleeve 3.5 (to meet the movement distance requirement of guide rod 3.1); the axial length L6 of guide rod 3.1 must be greater than twice the axial length L5 of sleeve 3.5 (to prevent guide rod 3.1 from slipping off guide bracket 3.2).

[0032] In this embodiment, a low-pressure pipeline controllable pressure oscillation generator is installed at the end of a water supply pipeline, and its working principle is as follows: I. The process of pressure wave generation: like Figure 1 , Figure 2 , Figure 3 As shown: Under the action of the total pressure of the water flow, the pressure energy conversion motion component 3 starts to move to the right together. During this motion, the spring 3.3 is compressed and stores energy. When the pressure energy conversion motion component 3 moves to the outlet 2.5 (baffle 3.4 crosses the edge of the outlet 2.5), the front chamber 2.1 of the pressure energy conversion component 2 connects with the slow flow pressure regulating chamber of the slow flow pressure regulating component 4, and the pressurized water flow in the front chamber 2.1 begins to flow into the slow flow pressure regulating chamber; due to the discharge, the total pressure of the water flow in front of baffle 3.4 begins to decrease; when the total pressure of the water flow is equal to the energy storage thrust of the spring 3.3, the pressure energy conversion motion component 3 stops moving; since the water flow pressure in front of baffle 3.4 is greater than the water flow pressure in the slow flow pressure regulating chamber, the discharge continues. During the discharge process, the total pressure of the water flow in front of baffle 3.4 also decreases, and its value is less than the thrust generated by the release of energy by the spring 3.3. Therefore, the pressure energy conversion motion component 3 begins to move to the left, and the water flow in front of baffle 3.4 is subjected to the energy release thrust of the spring 3.3 to generate a pressure wave and transmit it to the left. After the baffle 3.4 moves past the outlet 2.5, the sleeve 3.5 seals the outlet 2.5 again, and the water pressure in the front chamber 2.1 begins to rise. The relative difference between the pressure pressure and the energy release thrust of the spring 3.3 gradually decreases, causing the pressure-energy conversion motion component 3 to decelerate. When the baffle 3.4 reaches the stop body 2.6, the pressure-energy conversion motion component 3 stops moving to the left. Next, under the action of the total water pressure, the pressure-energy conversion motion component 3 begins to move to the right, repeating the above process.

[0033] In summary, the logical process of pressure wave generation in pressurized pipe 1 can be briefly described as follows: Under the pressure of the water flow itself in pressurized pipe 1 → the pressure energy conversion motion component 3 is pushed to the right → the spring 3.3 compresses and stores energy → the outlet 2.5 releases water → the total pressure of the water flow in front of baffle 3.4 decreases → the spring 3.3 releases energy and forms a thrust to the left → the pressure energy conversion motion component 3 moves to the left → the pressure wave is generated and transmitted to the left → the sleeve 3.5 blocks the outlet 2.5 → the total pressure of the water flow in front of baffle 3.4 rises again → the pressure energy conversion motion component 3 decelerates to the left → the limit body 2.6 restricts the pressure energy conversion motion component 3 to stop moving to the left → under the pressure of pressurized pipe 1 → the pressure energy conversion motion component 3 is pushed to the right → ..., and so on, continuously generating pressure waves that are transmitted to the left, forming pressure oscillations in pressurized pipe 1.

[0034] II. The adjustment principles of pressure wave parameters (amplitude and frequency) are as follows: With the structural parameters of the device fixed, the generation of pressure waves mainly depends on the difference between the total water pressure before baffle 3.4 and the water pressure in the slow-flow pressure regulating chamber. The total water pressure before baffle 3.4 is always greater than the water pressure in the slow-flow pressure regulating chamber, and the magnitude of this difference determines the discharge flow rate of the outlet 2.5. The greater the difference between the pressure difference and the flow rate at outlet 2.5, the greater the pressure drop in front of baffle 3.4. In this case, the energy release thrust of spring 3.3 is greater than the total water pressure in front of baffle 3.4, causing baffle 3.4 to move rapidly to the left, generating a pressure wave with a large amplitude to the left. Conversely, when the difference between the total water pressure in front of baffle 3.4 and the pressure in the pressure regulating chamber is small, the pressure drop at outlet 2.5 is relatively small, and the difference between the energy release thrust of spring 3.3 and the total water pressure in front of baffle 3.4 is also relatively small. Consequently, the leftward movement speed of baffle 3.4 is relatively slow, and the amplitude of the generated pressure wave is also relatively small. Therefore, to adjust the amplitude of the pressure wave, the water pressure in the pressure regulating chamber must be adjusted.

[0035] The inlet of the slow-flow pressure regulating chamber is the outlet 2.5 of the pressure-energy conversion component 2, and its outlet is the outlet 4.3. An opening adjustment device 4.4 is installed to regulate the water pressure in the slow-flow pressure regulating chamber. The flow rate of the outlet 4.3 is related to the water pressure in the slow-flow pressure regulating chamber and the cross-sectional area of ​​the outlet 4.3. A higher water pressure or a larger cross-sectional area at the outlet 4.3 results in a larger flow rate; conversely, a smaller flow rate results in a smaller flow rate. Therefore, the flow rate of the outlet 4.3 is adjusted by regulating the cross-sectional area of ​​the outlet 4.3 using the opening adjustment device 4.4, thereby regulating the water pressure in the slow-flow pressure regulating chamber.

[0036] By adjusting the water pressure value in the slow-flow pressure regulating chamber, the pressure difference between the water flow pressure before baffle 3.4 and the water flow pressure in the slow-flow pressure regulating chamber is adjusted. This not only regulates the amplitude of the pressure wave generated before baffle 3.4 but also adjusts the frequency of the pressure wave. When the structural parameters of the device are fixed, the frequency of the pressure wave is relatively high when the pressure difference is small, and relatively low when the pressure difference is large.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A controllable pressure oscillation generator for low-pressure pipelines, characterized in that: It includes a pressure energy conversion component (2), a pressure energy conversion motion component (3), and a slow-flow pressure regulating component (4); The linear cavity inside the pressure energy conversion component (2) serves as the pressure energy conversion chamber; the pressure energy conversion motion component (3) is slidably sealed and assembled inside the pressure energy conversion chamber. The pressure energy conversion chamber is divided into a front chamber (2.1) and a rear chamber (2.2) along its length, with the baffle (3.4) end of the pressure energy conversion motion component (3) as the boundary. The front chamber (2.1) is directly connected to the inlet (2.3) of the pressure energy conversion component (2), and the rear chamber (2.2) is provided with a breathing port (2.4) to connect to the atmosphere; the side of the front chamber (2.1) has an outlet (2.5); the rear chamber (2.2) is connected to the pressure energy conversion motion component (3) by an elastic reset mechanism; The pressure energy conversion motion component (3) can slide in the pressure energy conversion chamber under the pressure fluctuation of the fluid pressure in the front chamber (2.1) and the energy release thrust of the elastic reset mechanism. The pressure energy conversion motion component (3) switches between completely blocking the drain port (2.5) and dynamically adjusting the opening range of the drain port (2.5). The slow-flow pressure regulating component (4) is located outside the pressure energy conversion component (2). The slow-flow pressure regulating component (4) includes a slow-flow pressure regulating chamber connected to the discharge port (2.5). The outlet (4.3) of the slow-flow pressure regulating chamber is offset from the discharge port (2.5).

2. The controllable pressure oscillation generator for low-pressure pipelines according to claim 1, characterized in that: The anterior chamber (2.1) is provided with a limiting body (2.6). The limiting body (2.6) is used to limit the maximum stroke of the pressure energy conversion motion component (3) driven by the elastic reset mechanism. When the pressure energy conversion motion component (3) stops at the limiting body (2.6), the drain port (2.5) is completely blocked.

3. The low-pressure pipeline controllable pressure oscillation generator according to claim 1, characterized in that: The elastic reset mechanism includes a guide rod (3.1), a spring (3.3), and a guide bracket (3.2); the guide rod (3.1) is fixed on the center line of the pressure energy conversion motion assembly (3), and the guide rod (3.1) is parallel to the length direction of the pressure energy conversion chamber; the guide bracket (3.2) is fixed in the rear chamber (2.2), and the guide rod (3.1) slides through the guide hole in the center of the guide bracket (3.2); the spring (3.3) is sleeved on the guide rod (3.1) and supports between the pressure energy conversion motion assembly (3) and the guide bracket (3.2).

4. The low-pressure pipeline controllable pressure oscillation generator according to claim 1, characterized in that: The slow-flow pressure regulating chamber is an annular cavity surrounding the pressure energy conversion component (2). The slow-flow pressure regulating chamber includes a conical ring section (4.1) and a straight ring section (4.2). The small end of the conical ring section (4.1) is located on one side of the outlet (2.5), and the large end of the conical ring section (4.1) is aligned with the straight ring section (4.2). The outlet (4.3) is located on the straight ring section (4.2) on the side away from the conical ring section (4.1).

5. The low-pressure pipeline controllable pressure oscillation generator according to claim 4, characterized in that: The inlet (2.3) of the pressure energy conversion component (2) is connected to the pressure energy conversion chamber via the variable cross-section chamber (2.7). The small end of the variable cross-section chamber (2.7) is aligned with the inlet (2.3), and the large end of the variable cross-section chamber (2.7) is aligned with the pressure energy conversion chamber.

6. The low-pressure pipeline controllable pressure oscillation generator according to claim 5, characterized in that: The cross-sections of the pressure energy conversion chamber, the variable cross-section chamber (2.7), and the slow-flow pressure regulating chamber are all circular, and their center lines are located on the same axis; the center line of the pressure energy conversion motion component (3) is also located on this axis.

7. The controllable pressure oscillation generator for low-pressure pipelines according to claim 1, characterized in that: The slow-flow pressure regulating component (4) is equipped with an opening adjustment device (4.4) outside the outlet (4.3). The opening adjustment device (4.4) can adjust the opening size of the outlet (4.3), thereby realizing the control and adjustment of the pressure wave amplitude and frequency.

8. The controllable pressure oscillation generator for low-pressure pipelines according to claim 1, characterized in that: The pressure energy conversion motion component (3) includes a sleeve (3.5) and a baffle (3.4). The sleeve (3.5) is slidably nested in the pressure energy conversion chamber, and the baffle (3.4) is connected to the sleeve (3.5) and closes the opening of the sleeve (3.5).

9. A controllable pressure oscillation generator for low-pressure pipelines according to claim 8, characterized in that: The sleeve (3.5) has sealing rings (3.6) fitted at both ends of its outer wall.

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