A pulsating pressure generation and excitation system and method in a high-pressure liquid pipeline

Abstract

This invention discloses a pulsating pressure generation and excitation system and method for high-pressure liquid pipelines. It employs an internal flow channel fixed within a main body structure. The internal flow channel is a transverse through-hole structure with vertical through-holes, the axis of which is perpendicular to the axis of the transverse through-holes. A rotor is nested within the vertical through-holes of the internal flow channel. The main body has rotor holes coaxial with the vertical through-holes of the internal flow channel. The transverse through-holes of the internal flow channel serve as liquid flow channels. Multiple cutting blades are circumferentially spaced on the rotor. By controlling the number of speed changes, the amount of change, and the duration of the change, a continuous change in pulsating pressure from one frequency to another is achieved, thereby generating frequency-sweeping pulsating pressure changes. The excited pressure pulsation amplitude is high, and the frequency of the pressure pulsation can be easily adjusted to generate high-frequency pressure pulsations. This invention features a simple structure, smooth fluid channels, continuous flow, and low energy loss.

Description

Technical Field

[0001] This invention belongs to the field of pulsation generators, specifically relating to a pulsation pressure generation excitation system and method in a high-pressure liquid pipeline. Background Technology

[0002] In energy and power equipment used in aerospace, naval vessels, and nuclear power, there are numerous high-pressure liquid pipeline systems. To study the safety and reliability of components or systems operating under pulsating pressure, it is necessary to conduct dynamic response characteristic studies on these components or systems under high-pressure environments. This often requires actively exciting the pipeline system to generate continuous and controllable pulsating pressure to complete the corresponding scientific experiments. Furthermore, in industrial production processes that require enormous liquid impact forces to complete certain processes, exciters are needed to generate controllable pulsating pressure to provide the necessary production conditions.

[0003] Currently known related patents include: a disc-type flow pulsation generator (application number: CN201110253476.2) and a plunger-type flow pulsation generator (application number: CN200810232217.X).

[0004] Patent 201110253476.2 discloses a rotary flow pulsation generator. A liquid flow channel is formed by through holes evenly distributed along the circumference of the rotary disc and a sleeve pressed against the disc's sealing surface by clamping bolts. When the disc rotates, the through holes on the disc and the liquid flow channel inside the sleeve open or close at a certain period, thus generating flow pulsations at a certain frequency, up to 1000Hz. The disc is placed outside the piping system, with only the through holes on the disc connecting to the pipe. The pulsation generator cannot withstand high pressure.

[0005] Patent 200810232217.X discloses a plunger-type flow pulsation generator, comprising a turntable with positioning holes, a propulsion shaft, a propulsion linear guide rail assembly, a guide linear guide rail assembly, a plunger, a cylinder, a sealing end cap, a motor, a reducer, and a frequency converter. The plunger cylinder is connected to the flow pipeline via a tee, drawing in or expelling a certain amount of fluid from the main pipeline, superimposing a sinusoidal pulsation onto the main flow. It can generate standard sinusoidal flow outputs with varying precise pulsation amplitudes and continuous variation periods. However, due to the limitations of reciprocating motion inertia, it cannot generate high-frequency flow pulsations. Summary of the Invention

[0006] The purpose of this invention is to provide a pulsating pressure generation excitation system and method in high-pressure liquid pipelines, so as to overcome the problems that existing pulsation generators cannot withstand high pressure or cannot generate high-frequency flow pulsations.

[0007] A pulsating pressure generation and excitation system for a high-pressure liquid pipeline includes an exciter. The exciter includes a body, a rotor, and an inner flow channel. The inner flow channel is fixed within the body and has a transverse through-hole structure. A vertical through-hole is provided on the inner flow channel, with the axis of the vertical through-hole perpendicular to the axis of the transverse through-hole. The rotor is nested within the vertical through-hole of the inner flow channel. The body has a rotor hole coaxial with the vertical through-hole of the inner flow channel. One end of the rotor passes through the rotor hole on the body and is connected to a power source. The transverse through-hole of the inner flow channel is a liquid flow channel. The portion of the liquid flow channel on one side of the rotor is a first liquid flow channel, and the portion on the other side of the rotor is a second liquid flow channel. The rotor has multiple circumferentially spaced cutting blades. The interior of the rotor is an internal flow cavity. There is a cutting blade inter-channel between two adjacent cutting blades. The cutting blade inter-channel connects the internal flow cavity of the rotor with the first liquid flow channel and also connects the internal flow cavity of the rotor with the second liquid flow channel. The opening area of ​​the second liquid flow channel near the rotor end is smaller than the opening area of ​​the first liquid flow channel near the rotor end.

[0008] Preferably, the inner flow channel and the main body adopt an integral structure or an interference fit connection.

[0009] Preferably, the end of the second fluid flow channel near the rotor has the smallest cross-section, and the rotor forms a gap with the smallest cross-section, the gap width being 0.01 to 3.0 mm.

[0010] Preferably, a first sliding bearing and a second sliding bearing are respectively installed at both ends of the rotor; a rotor end cap is provided at one end of the rotor hole of the body, and the rotor end cap is fixed on the body to limit the first sliding bearing; a rotor pressure cap is provided at the other end of the rotor hole of the body, and the rotor pressure cap limits the second sliding bearing.

[0011] Preferably, the rotor end cover and the end of the body are sealed with a sealing gasket.

[0012] Preferably, one end of the rotor is connected to a servo motor system via a magnetic drive system.

[0013] Preferably, the magnetic drive system includes an inner magnet, an outer magnet, and an isolation sleeve;

[0014] One end of the rotor is fixedly connected to the inner magnet, the isolation sleeve is fitted over the inner magnet, the isolation sleeve is fixed to the body through a flange, and the outer magnet is fixedly connected to the servo motor system.

[0015] Preferably, the servo motor system includes a servo motor, the output shaft of which is fixedly connected to the outer magnet; the outer magnet is sleeved on the outside of the isolation sleeve.

[0016] Preferably, the servo motor and the main body are fixedly connected by a motor bracket.

[0017] A method for generating pulsating pressure in a high-pressure liquid pipeline includes the following steps:

[0018] S1, Select the number of blades to be cut based on the excitation frequency;

[0019] S2, and then the rotor speed is controlled by the power source to obtain the corresponding pulsating pressure excitation frequency;

[0020] The pulsation frequency f generated by the exciter is related to the number of rotor cut-off blades z and the rotor speed n as follows: f = zn / 60.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] This invention discloses a pulsating pressure generation and excitation system for high-pressure liquid pipelines. It employs an internal flow channel fixed within a main body structure. The internal flow channel is a transverse through-hole structure with vertical through-holes, the axis of which is perpendicular to the axis of the transverse through-holes. A rotor is nested within the vertical through-holes of the internal flow channel. The main body has rotor holes coaxial with the vertical through-holes of the internal flow channel. The transverse through-holes of the internal flow channel serve as liquid flow channels. The portion of the liquid flow channel on one side of the rotor is the first liquid flow channel, and the portion on the other side is the second liquid flow channel. Multiple cutting blades are circumferentially spaced on the rotor. The rotor interior is an internal flow cavity, and the space between adjacent cutting blades is a cutting blade inter-blade channel. By controlling the number of speed changes, the amount of change, and the duration of the change, a continuous change in pulsating pressure from one frequency to another is achieved, thereby generating frequency-sweeping pulsating pressure changes. The excited pressure pulsation amplitude is high, and the frequency of the pressure pulsation can be easily adjusted to generate high-frequency pressure pulsations. This invention features a simple structure, smooth fluid channels, continuous flow, and low energy loss.

[0023] The magnetic drive system enables contactless transmission between the servo motor and the rotor. The inner magnet and the rotating rotor are completely enclosed in the medium, and the static seal achieves zero leakage. Attached Figure Description

[0024] Figure 1 This is a system diagram of the pulsating pressure generator system in the high-pressure liquid pipeline of the present invention.

[0025] Figure 2 This is a three-dimensional model of the pulsating pressure generator system in the high-pressure liquid pipeline of the present invention.

[0026] Figure 3 This is an axial cross-sectional view of the rotor of the pulsating pressure generating exciter system in the high-pressure liquid pipeline of the present invention.

[0027] Figure 4 This is a radial cross-sectional view of the rotor of the pulsating pressure generating exciter system in the high-pressure liquid pipeline of the present invention.

[0028] Figure 5 This is a schematic diagram of the internal flow channel gap of the rotor in Embodiment 1 of the high-pressure liquid pipeline pulsating pressure generating exciter system of the present invention.

[0029] Figure 6 This is a schematic diagram of the internal flow channel gap of the rotor in Embodiment 2 of the high-pressure liquid pipeline pulsating pressure generating exciter system of the present invention.

[0030] Figure 7 This is a simplified schematic diagram of the working process of the pulsating pressure generating exciter system in the high-pressure liquid pipeline of the present invention.

[0031] Figure 8 This refers to the pressure pulsation signal generated by the pulsating pressure generator system in the high-pressure liquid pipeline of the present invention.

[0032] In the diagram: 1. Body, 2. Rotor, 3. Inner flow channel, 4. First sliding bearing, 5. Second sliding bearing, 6. Rotor end cover, 7. Rotor end cover sealing gasket, 8. Rotor gland, 9. Inner magnet, 10. Locking nut, 11. Isolation sleeve, 12. Isolation sleeve sealing gasket, 13. Outer magnet, 14. Inlet connector, 15. First sealing gasket, 16. Outlet connector, 17. Second sealing gasket, 18. Servo motor, 19. Motor bracket, 20. Base, 23. Gap, 31. Minimum cross section, 201. Inter-blade channel, 202. Rotor internal flow cavity, 300. Liquid flow channel, 301. First liquid flow channel, 302. Second liquid flow channel. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] like Figure 1-4 As shown, this invention discloses a pulsating pressure generation and excitation system for high-pressure liquid pipelines, comprising an exciter, a magnetic drive system, a test and control system, and a servo motor system. The test and control system sends commands to the servo motor system via communication, controlling the rotational speed, the number of speed change steps, the amount of change, and the duration of the change, thereby achieving the required continuous change of pulsating pressure from one frequency to another, thus generating fixed-frequency and swept-frequency pulsating pressure changes.

[0036] The actuator includes a body 1, a rotor 2, and an inner flow channel 3. The inner flow channel 3 is fixed inside the body 1 and has a transverse through-hole structure. A vertical through-hole is provided on the inner flow channel 3, with its axis perpendicular to the transverse through-hole axis. The rotor 2 is nested within the vertical through-hole of the inner flow channel 3. The body 1 is a shell structure, with a rotor hole coaxial with the vertical through-hole of the inner flow channel 3. One end of the rotor 2 passes through the rotor hole on the body 1 and connects to a power source. The transverse through-hole of the inner flow channel 3 is a liquid flow channel 300. The portion of the liquid flow channel 300 located on one side of the rotor 2 is the first liquid flow channel 301, and the portion located on the other side of the rotor 2 is the second liquid flow channel 302. Multiple cutting blades are circumferentially spaced on the rotor 2. The interior of the rotor 2 is an internal rotor flow cavity 202, and the space between two adjacent cutting blades is a cutting blade inter-blade channel 2. 01. The cut-off blade channel 201 connects the rotor's internal flow cavity 202 with the first liquid flow channel 301, and simultaneously connects the rotor's internal flow cavity 202 with the second liquid flow channel 302. The opening area of ​​the second liquid flow channel 302 near the rotor 2 is smaller than the opening area of ​​the first liquid flow channel 301 near the rotor 2. When one of the cut-off blades of the rotor 2 rotates to the opening of the second liquid flow channel 302, the connection between the rotor's internal flow cavity 202 and the second liquid flow channel 302 is gradually cut off until the cut-off blade rotates to completely overlap with the port of the second liquid flow channel 302. At this point, the connection between the rotor's internal flow cavity 202 and the second liquid flow channel 302 is cut off, and then rotation continues to gradually reconnect the rotor's internal flow cavity 202 and the second liquid flow channel 302. In this way, when the rotor rotates, each cut-off blade alternately cuts off and connects the rotor's internal flow cavity and the second liquid flow channel 302, thereby generating a fluid pulsating pressure in the pipeline with the same frequency as the rotation of the cut-off blades.

[0037] The port on the second fluid flow channel 302 that connects to the internal flow cavity 202 of the rotor has a rectangular, rhomboid, or circular cross-sectional shape along the axis of the internal flow channel 3 perpendicular to the axis of the internal flow channel 3.

[0038] When the rotor cutting blade cuts off and connects the rotor internal flow cavity 202 with the second liquid flow channel 302, the second liquid flow channel 302 is always connected to the first liquid flow channel 301, ensuring the continuity of flow. The inner flow channel 3 and the body 1 adopt an integral structure or an interference fit connection.

[0039] Specifically, taking the example of a circular cross-section along the axis of the inner flow channel 302, where the port of the second flow channel 302 communicates with the internal flow cavity 202 of the rotor, as an example, the rotor 2 is installed in the through hole of the inner flow channel 3, and the axis of the rotor 2 is perpendicular to the liquid flow direction of the flow channel 300. The end of the second flow channel 302 near the rotor 2 has a minimum cross-section 31, and the rotor 2 forms a gap 23 with the minimum cross-section 31. Both ends of the gap 23 communicate with the first flow channel 301, one middle end of the gap 23 communicates with the internal flow cavity 202 of the rotor through the cut-off blade channel 201, and the other middle end of the gap 23 communicates with the second flow channel 302.

[0040] As the rotor 2 rotates, a cutting blade gradually overlaps with the minimum cross-section 31, gradually cutting off the connection between the internal flow cavity 202 of the rotor and the gap 23 (i.e., the connection between the internal flow cavity 202 of the rotor and the second fluid flow channel 302) until the cutting blade completely overlaps with the minimum cross-section 31, completely cutting off the connection between the internal flow cavity 202 of the rotor and the gap 23. Then, the cutting blade gradually separates from the minimum cross-section 31, and the internal flow cavity 202 of the rotor and the gap 23 gradually reconnect. In this way, the rotor cutting blade alternately cuts off and connects the internal flow cavity of the rotor and the gap, thereby generating a fluid pulsating pressure in the pipeline at the same frequency as the rotation of the cutting blade. The gap width is 0.01–3.0 mm.

[0041] The first liquid flow channel 301 is always connected to the gap 23, and the gap 23 is always connected to the second liquid flow channel 302.

[0042] The rotor 2 is equipped with a first sliding bearing 4 and a second sliding bearing 5 at both ends, respectively; both the first sliding bearing 4 and the second sliding bearing 5 are made of hard alloy; a rotor end cover 6 is provided at one end of the rotor hole of the body 1, the rotor end cover 6 is fixed on the body 1 to limit the first sliding bearing 4, and the rotor end cover 6 and the end of the body 1 are sealed with a sealing gasket 7. A rotor pressure cover 8 is provided at the other end of the rotor hole of the body 1, the rotor pressure cover 8 is fixed on the body 1 by screws, and limits the second sliding bearing 5.

[0043] One end of rotor 2 is connected to the servo motor system (power source) via a magnetic drive system;

[0044] The magnetic drive system includes an inner magnet 9, an outer magnet 13, and an isolation sleeve 11.

[0045] One end of the rotor 2 is fixedly connected to the inner magnet 9, and the rotor 2 and the inner magnet 9 are locked together by a locking nut 10. The isolation sleeve 11 is fitted over the inner magnet 9 and fixed to the body 1 by a flange, and a sealing gasket 12 is used to seal the flange and the body 1.

[0046] The servo motor system includes a servo motor 18, the output shaft of which is fixedly connected to the outer magnet 13. The outer magnet 13 is sleeved on the outside of the isolation sleeve 11. When the shaft of the servo motor 18 rotates, the outer magnet 13 rotates, driving the inner magnet 9 to rotate under the action of electromagnetic attraction, directly driving the rotor 2 to rotate. One end of the motor bracket 19 is connected to the servo motor 18, and the other end is connected to the body 1.

[0047] One end of the first liquid flow channel 301 of the body 1 is connected to an inlet connector 14, which is fixed to the inlet of the body 1. A first sealing gasket 15 seals the inlet connector 14 with the body 1. One end of the second liquid flow channel 302 of the body 1 is connected to an outlet connector 16, which is fixed to the outlet of the body 1. A second sealing gasket 17 seals the outlet connector 16 with the body 1. Both the body 1 and the servo motor 18 are fixedly mounted on the base 20 with bolts.

[0048] When the pulsating pressure generation excitation system in the high-pressure liquid pipeline is working, the inlet connector 14 is connected to the incoming flow channel, and the outlet connector 16 is connected to the downstream channel. When the fluid enters the exciter, it passes through the inlet connector 14, the first liquid flow channel 301, the flow channel between the cutting blades 201, the internal flow cavity 202 of the rotor, the gap 23, the second liquid flow channel 302, and the outlet connector 16 in sequence.

[0049] By designing the rotor speed and the number of cutting blades, different pulsating pressure excitation frequencies can be obtained. The pulsating frequency f generated by the exciter is related to the number of rotor cutting blades z and the rotor speed n as follows: f = zn / 60.

[0050] Example 1

[0051] like Figure 5 As shown, the rotor has 5 cutting blades, meaning that when the servo motor input speed is 60 r / min, the excitation frequency is 50 Hz, and when the magnetic motor input speed is 3000 r / min, the excitation frequency is 250 Hz. Therefore, the cutting blades of rotor 2 periodically open and close the fluid channel formed with the inner flow channel 3 at a frequency of 5n / 60 times / s. Figure 7As shown, this describes the process by which the blades periodically open and close the fluid flow channel 300 during the rotation of rotor 2. Figure 8 The measured 250Hz pressure pulsation signal is generated by the pulsating pressure exciter in Example 1.

[0052] Example 2

[0053] like Figure 6 The rotor has 22 cutting blades, which means that when the servo motor input speed is 6000 r / min, the excitation frequency is 2200 Hz.

[0054] The exciter, magnetic drive system, and servo motor system of this application are connected to the test control system. The test control system realizes the continuous change of pulsating pressure from one frequency to another by controlling the number of speed change steps, the amount of change, and the duration of change, thereby generating frequency-sweeping pulsating pressure changes.

[0055] The sliding bearing is made of hard alloy, which has high strength and corrosion resistance. The sliding bearing is lubricated by liquid inside the pipe.

[0056] The magnetic drive system enables contactless transmission between the servo motor 18 and the rotor 2. A fully sealed, magnetically permeable isolation sleeve is provided between the inner and outer magnets, completely separating the inner and outer magnets. The inner magnet and the rotating rotor are completely enclosed in a medium, thus the exciter is leak-free and withstands high pressure. The shaft of the servo motor 18 drives the rotor to rotate synchronously through the electromagnetic attraction of the inner and outer magnets. One end of the motor bracket is fixed to the main body, and the other end is fixed to the motor flange, covering the magnetic drive components.

[0057] The high-pressure liquid pipeline pulsation pressure generation excitation system of the present invention has a high excitation pressure pulsation amplitude, a wide frequency range, and a high frequency of over 5000Hz; the exciter can withstand pressure of over 35MPa; the frequency of the pressure pulsation can be easily adjusted; it can generate high-frequency pressure pulsation; the generated pressure pulsation waveform has good sinusoidal characteristics; the fluid channel is smooth, the flow is continuous, and the energy loss is small; the rotor of the rotating component is completely enclosed in the medium, and zero leakage is achieved by using static sealing.

Claims

1. A system for generating excitation of pulsating pressure in a high pressure liquid line, characterized by The exciter comprises a body (1), a rotor (2) and an inner flow channel (3), the inner flow channel (3) is fixed in the body (1), the inner flow channel (3) is a transverse through hole structure, a vertical through hole is arranged on the inner flow channel (3), the axis of the vertical through hole is perpendicular to the axis of the transverse through hole, the rotor (2) is nested in the vertical through hole of the inner flow channel (3), a rotor hole coaxial with the vertical through hole of the inner flow channel (3) is formed in the body (1), one end of the rotor (2) penetrates through the rotor hole in the body (1) and is connected to a power source; the transverse through hole of the inner flow channel (3) is a liquid flow channel (300), the part of the liquid flow channel (300) on one side of the rotor (2) is a first liquid flow channel (301), the part of the liquid flow channel (300) on the other side of the rotor (2) is a second liquid flow channel (302), a plurality of cut-off blades are arranged on the rotor (2) in a circumferential direction, the inside of the rotor (2) is a rotor internal flow cavity (202), a cut-off blade inter-channel (201) is arranged between two adjacent cut-off blades, the cut-off blade inter-channel (201) connects the rotor internal flow cavity (202) and the first liquid flow channel (301), and at the same time, the cut-off blade inter-channel (201) can connect the rotor internal flow cavity (202) and the second liquid flow channel (302); the opening area of the second liquid flow channel (302) close to one end of the rotor (2) is smaller than the opening area of the first liquid flow channel (301) close to one end of the rotor (2), the end of the second liquid flow channel (302) close to the rotor (2) is a minimum cross section (31), the rotor (2) and the minimum cross section (31) form a gap (23), the width of the gap (23) is 0.01-3.0mm, one end of the rotor (2) is connected to a servo motor system through a magnetic transmission system, the magnetic transmission system comprises an inner magnetic steel (9), an outer magnetic steel (13) and an isolation sleeve (11); one end of the rotor (2) is fixedly connected to the inner magnetic steel (9), the isolation sleeve (11) is sleeved outside the inner magnetic steel (9), the isolation sleeve (11) is fixed on the body (1) through a flange, and the outer magnetic steel (13) is fixedly connected to the servo motor system.

2. A system for exciting pressure pulsations in a high pressure liquid line according to claim 1, characterized in that The inner flow channel (3) and the body (1) adopt an integrated structure or are connected through interference fit.

3. A system for exciting pressure pulsations in a high pressure liquid line according to claim 1, wherein The two ends of the rotor (2) are respectively provided with a first sliding bearing (4) and a second sliding bearing (5); one end of the rotor hole of the body (1) is provided with a rotor end cover (6), the rotor end cover (6) is fixed on the body (1) to define the first sliding bearing; the other end of the rotor hole of the body (1) is provided with a rotor gland (8), and the rotor gland (8) defines the second sliding bearing (5).

4. A system for exciting pressure pulsations in a high pressure liquid line according to claim 1, wherein The servo motor system comprises a servo motor (18), the output shaft of the servo motor (18) is fixedly connected to the outer magnetic steel (13); and the outer magnetic steel (13) is sleeved outside the isolation sleeve (11).

5. A method of generating excitation of pulsating pressure in a high-pressure liquid pipeline based on the system of generating excitation of pulsating pressure in a high-pressure liquid pipeline according to claim 1, characterized by The method comprises the following steps: S1, selecting the number of cut-off blades according to the excitation frequency; S2, then controlling the rotor speed through the power source to obtain the corresponding pulsating pressure excitation frequency.

6. The method of claim 5, wherein the excitation is applied to the high pressure liquid line at a frequency of 0.1 to 10 Hz. The pulsation frequency f generated by the exciter has the following relationship with the number of rotor cut-off blades z and the rotor rotation speed n: .

7. The method of claim 5, wherein the excitation is a pressure pulse. The rotor (2) is accommodated in the liquid flow passage (300), and the inner flow cavity (202) of the rotor is periodically communicated with the gap (23) and the second liquid flow passage (302) during rotation of the rotor (2).

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