An ultrahigh pressure wave blocking and silencing device and a noise attenuation value calculation method

Abstract

The application belongs to the technical field of ultrahigh pressure, and particularly relates to an ultrahigh pressure wave blocking and silencing device and a noise attenuation value calculation method. The application comprises a switching flange, a wave blocking and silencing sleeve set and an energy dissipation impact block. A coaxial flow collecting outer cylinder is further sleeved outside the wave blocking and silencing sleeve set, and a gap for temporarily storing medium is arranged between the wave blocking and silencing sleeve set and the flow collecting outer cylinder. A flow collecting hole is arranged radially through the flow collecting outer cylinder. The wave blocking and silencing sleeve set is composed of two or more wave blocking and silencing rings coaxially connected in sequence. The wave blocking and silencing ring comprises a ring body, and a wave blocking and silencing ring is coaxially arranged in the flow ring cavity. A passing hole is coaxially arranged at the wave blocking and silencing ring. The medium flowing out of the horn surface of the wave blocking and silencing ring is discharged through the radial guide hole arranged at the ring body. The application can realize the energy dissipation and noise reduction effect of the tail flow of high-speed jet flow, so as to reduce the jet impact kinetic energy, ensure the test safety and improve the test comfort.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high voltage technology, specifically relating to an ultra-high voltage wave blocking and silencing device and a method for calculating noise attenuation value. Background Technology

[0002] Modern ultra-high pressure water jet technology began to develop in the 1930s, originating in the mining industry. It uses water jets to flush ore layers and transport, screen, or clean ore. With the development of new technologies, the application of new processes has been promoted, and the widespread operation of new technologies has in turn promoted the research and deepening of new processes.

[0003] The fundamental conditions for generating a jet are pressure difference and micropores. Pressure difference creates flow, and micropores create high-velocity jets. Therefore, a liquid jet is a high-pressure water flow passing through micropores, forming ultra-high-speed streams of different shapes under a huge pressure difference. The velocity of the stream depends on the pressure difference before and after the nozzle exit section. This high-energy jet stream rubs against the air at high speed in the boundary region. This repetitive and regular friction causes air vibration, which in turn causes periodic changes in compression or expansion in various parts of the air medium. The difference between the pressure and hydrostatic pressure in the changing part is called sound pressure. Sound intensity is determined by the amplitude of vibration; when expressed as energy, it is called sound intensity, and when expressed as pressure, it is called sound pressure. The relationship between sound intensity I and sound pressure P is:

[0004] I = P 2 / ρc

[0005] Where ρ is the density of the medium; c is the speed of sound in the medium;

[0006] As can be seen from the above formula, the sound intensity is inversely proportional to the medium density and the medium sound velocity, and directly proportional to the square of the sound pressure. The most direct and effective way to control the sound intensity of the jet is to control the sound pressure. To control the sound pressure, it is necessary to change the high internal energy state of the jet and reduce its high-speed friction with the air.

[0007] Current ultra-high pressure liquid jet technology, in practical applications, often reduces sound intensity by altering the medium's density and sound velocity. For example, the jet beam impacts the liquid, preventing frictional vibration with air, as described in Chinese Patent Publication No. CN86189A, titled "Energy Dissipation Container for High-Speed ​​Liquid Jet." Alternatively, the jet beam impacts a buffer energy-dissipating steel block, as described in Chinese Patent Publication No. CN115228316A, titled "A Composite Homogenization Method and Homogenization Head for Ultra-High Pressure Jet Impact, Airburst, and Shearing." These existing structures are either bulky or have poor noise reduction effects, failing to significantly reduce the kinetic energy of the ultra-high pressure jet beam and the environmental noise generated by ultra-high pressure fine-aperture high-speed jets. Furthermore, the quantification of noise reduction effects is insufficient, lacking specific quantitative formulas, resulting in poor consistency. Considering the requirements of safety testing, there is an urgent need to find a silencing device that combines a compact structure with good noise and energy reduction effects to meet the testing requirements of ultra-high pressure boosters. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-high pressure wave-damping and noise reduction device that can achieve energy dissipation and noise reduction of the tail flow at the end of a high-speed jet, thereby reducing the impact kinetic energy of the jet, ensuring experimental safety, and improving experimental comfort.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An ultra-high pressure wave-damping and silencing device is characterized by comprising a transition flange with a nozzle arranged sequentially along the axial direction, a wave-damping and silencing sleeve located on the nozzle injection path, and an energy-dissipating impact block located at the end of the wave-damping and silencing sleeve; a manifold outer cylinder is coaxially sleeved outside the wave-damping and silencing sleeve, and there is a gap between the wave-damping and silencing sleeve and the manifold outer cylinder for temporary storage of the medium; a manifold hole for the medium to flow out is arranged radially through the manifold outer cylinder.

[0011] The wave-damping and noise-absorbing sleeve is composed of two or more sets of wave-damping and noise-absorbing rings connected coaxially end to end; the wave-damping and noise-absorbing ring includes a ring body with a flow ring cavity, and a hysteresis ring is coaxially arranged in the flow ring cavity; a passage hole for medium to pass through is coaxially opened at the hysteresis ring, so that the hysteresis ring is shaped like a horn opening facing one end of the ring body; the medium flowing out along the horn surface of the hysteresis ring is discharged through the guide hole opened radially at the ring body.

[0012] Construct a rectangular coordinate system on the axial section of the hysteresis ring. The outer trumpet surface curve of the hysteresis ring is formed by combining the first curve equation f(x) and the second curve equation q(x), and the inner trumpet surface curve of the hysteresis ring is formed by the third curve equation t(x). At this time, the cross-sectional profile of the hysteresis ring located on one side of the axis is represented by the following piecewise function G(x):

[0013]

[0014] Preferably, the ring body has a three-section stepped shaft shape that is thick in the middle and thin at both ends. The flow guide hole is opened at the large diameter section of the ring body, and the small diameter section of the ring body is provided with external threads. Adjacent wave-damping and noise-absorbing rings are fastened to each other by coaxially arranged internal threads.

[0015] Preferably, a fixing ring protrudes from the side of the transition flange facing the first wave-damping and silencing ring. The fixing ring forms a threaded engagement with the first wave-damping and silencing ring located at the first end of the wave-damping and silencing sleeve assembly. At this time, the first-end set screw passes through the outer cylinder of the manifold and forms a tight fit with the fixing ring. A positioning ring protrudes from the side of the energy-dissipating and impact-bearing block facing the tail wave-damping and silencing ring. The inner ring wall of the positioning ring is provided with an internal thread section, thereby forming a threaded engagement with the adjacent end of the tail wave-damping and silencing ring located at the tail end of the wave-damping and silencing sleeve assembly. At this time, the tail-end set screw passes through the outer cylinder of the manifold and forms a tight fit with the outer ring wall of the positioning ring.

[0016] Preferably, each wave-blocking and noise-absorbing ring is arranged coaxially with each other, and the openings of the hysteresis rings of adjacent wave-blocking and noise-absorbing rings are oriented in the same direction or opposite to each other.

[0017] Preferably, the guide holes are distributed at both ends of the hysteresis ring to receive the medium flowing out along the inner and outer horn surfaces of the hysteresis ring, respectively.

[0018] Preferably, the guide holes are evenly distributed in sequence along the circumference of the ring, and the axis of the same pair of guide holes located at both ends of the hysteresis ring is perpendicular to the same generatrix of the ring.

[0019] Preferably, there are ten wave-damping and noise-absorbing rings.

[0020] Preferably, the noise attenuation value calculation method applies to the aforementioned ultra-high voltage wave blocking silencing device, characterized in that: the noise attenuation value ΔT of the ultra-high voltage wave blocking silencing device... Z The following formula can be used to calculate:

[0021] ΔT z =ΔL r ·lnθ+ΔL b ·e ε

[0022] in:

[0023] ΔL r This represents the resonant noise attenuation value.

[0024] θ is the equivalent coefficient of the outer cylinder of the confluence. Where S is the total area of ​​the manifold, and K is a coefficient;

[0025] ΔLb This represents the resistive noise attenuation value.

[0026] ε is a dimensionless constant; taking the direction of the hysteresis ring opening toward the nozzle as the positive installation direction, then:

[0027] When the hysteresis ring in the first wave-blocking and silencing ring is installed in the positive direction and the hysteresis rings in adjacent wave-blocking and silencing rings are in the same direction, ε=0.78;

[0028] When the hysteresis rings in the first wave-blocking and silencing ring are installed in opposite directions and the hysteresis rings in adjacent wave-blocking and silencing rings are in the same direction, ε=0.80;

[0029] When the hysteresis ring in the first wave-blocking and silencing ring is installed in the positive direction and the hysteresis rings in adjacent wave-blocking and silencing rings are opposite to each other, ε=0.85;

[0030] When the hysteresis rings in the first wave-blocking and silencing rings are installed in reverse and the hysteresis rings in adjacent wave-blocking and silencing rings are installed in reverse, ε = 0.87.

[0031] Preferably, the resonant noise attenuation value ΔL r The calculation formula is as follows:

[0032]

[0033]

[0034]

[0035]

[0036] in:

[0037] k is a dimensionless value; G is conductivity, a physical quantity in units of length; V is the volume of the inner cavity of the wave-damping and silencing sleeve; S is the cross-sectional area of ​​the internal cavity channel of the ultra-high pressure wave-damping and silencing device; n is the number of guide holes; d is the diameter of the guide holes; t0 is the depth of the guide holes; f is the natural frequency of the ultra-high pressure wave-damping and silencing device; f0 is the resonant frequency; c is the speed of sound; P is the perforation rate, which is the ratio of the area of ​​all guide holes on the wave-damping and silencing sleeve to the outer surface area of ​​the wave-damping and silencing sleeve; L is the thickness of the air layer in the gap between the wave-damping and silencing sleeve and the outer cylinder of the confluence.

[0038] Preferably, the resistive noise attenuation value ΔL b The calculation formula is as follows:

[0039]

[0040]

[0041] in:

[0042] is the sound absorption coefficient related to the material's sound absorption coefficient a0; a0 is the normal incident sound absorption coefficient; l is the effective length of the ultra-high pressure wave-blocking silencing device, which is the distance from the nozzle outlet to the impact end of the energy dissipation block; D is the ring diameter of the wave-blocking silencing ring minus the inner diameter of the hysteresis ring.

[0043] The beneficial effects of this invention are as follows:

[0044] 1) Through the above scheme, this invention utilizes the principle of resistive silencing to confine the noise generated by the friction between high-speed liquid and air to a certain range. A specially designed hysteresis ring restricts the propagation path of the sound waves, allowing them to attenuate within the internal space of the silencing assembly. Simultaneously, the layout of the guide holes further utilizes the principle of resonant silencing to achieve maximum energy dissipation and noise reduction. On the other hand, after combining the hysteresis ring with the ring body to form a silencing ring, this invention relies on coaxially connecting the silencing rings end-to-end and on the energy-dissipating impact block to reduce the impact force at the end of the ultra-high pressure jet liquid. This ensures that the jet beam, i.e., the medium, is attenuated by multiple sets of silencing rings (including the blocking and energy reduction by the hysteresis rings and the diversion and energy reduction by the guide holes) before striking the energy-dissipating impact block, ultimately achieving the purpose of energy dissipation and noise reduction. Meanwhile, the arrangement of the outer cylinder of the confluence compresses and reduces the back pressure of the diffuse flow of the outflowing medium, thus playing the role of collecting the medium so that the medium can eventually flow out through the confluence hole. This not only further dissipates energy but also facilitates collection and metering, resulting in significant effectiveness.

[0045] Therefore, this invention is mainly used in ultra-high pressure boosting jet test devices, which can achieve energy dissipation and noise reduction effects on the tail of high-speed jets, thereby reducing jet impact kinetic energy, ensuring test safety, and improving test comfort. Attached Figure Description

[0046] Figure 1 This is a front view of the present invention;

[0047] Figure 2 for Figure 1 Sectional view along axis AA;

[0048] Figure 3 An exploded view of the three-dimensional structure of the wave-damping and noise-absorbing sleeve;

[0049] Figure 4 This is a front view of a wave-damping energy-dissipating ring;

[0050] Figure 5 for Figure 4 A sectional view;

[0051] Figure 6 for Figure 5 A three-dimensional schematic diagram;

[0052] Figure 7 This is a schematic diagram of the three-dimensional structure of the outer cylinder of the confluence.

[0053] Figure 8 This is a structural sectional view of combination scheme 1;

[0054] Figure 9 This is a structural sectional view of combination scheme 2;

[0055] Figure 10 This is a structural sectional view of combination scheme 3;

[0056] Figure 11 This is a structural sectional view of combination scheme 4;

[0057] Figure 12 This is a schematic diagram of the piecewise function G(x) on the coordinate axes;

[0058] Figure 13 The graph shows the aspect ratio of the manifold versus the coefficient K.

[0059] Figure 14 Simulation diagram of an embodiment of combination scheme 1;

[0060] Figure 15 Simulation diagram of an embodiment of combination scheme 2;

[0061] Figure 16 Simulation diagram of an embodiment of combined scheme 3;

[0062] Figure 17 This is a simulation diagram of an embodiment of combination scheme 4.

[0063] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0064] 10-Sound-damping and noise-absorbing ring; 11-Ring body; 12-Hysteresis ring; 13-Guide hole; 14-Passage hole;

[0065] 20 - Adapter flange; 21 - Nozzle; 30 - Energy dissipation and impact block; 40 - Female threaded short connector;

[0066] 51-Setting screw at the beginning; 52-Setting screw at the end; 60-Outer cylinder of the manifold; 61-Manifold hole. Detailed Implementation

[0067] For ease of understanding, this section combines... Figures 1-17 The specific structure and operation of the present invention are further described below:

[0068] As is well known, when an object (whether gas, liquid, or solid) travels at extremely high speeds, it experiences high-speed friction with the atmosphere, generating noise, commonly known as a "whistle." Clearly, by limiting the noise generation mechanism or the propagation path of the noise waves, this noise pollution can be effectively reduced. This invention proposes an effective process and equipment to minimize this "whistle" noise.

[0069] like Figure 1 As shown, this invention employs the principle of resistive silencing, confining the noise generated by the friction between high-speed liquid and air within a certain range. A specially designed hysteresis ring 12 restricts the propagation path of the sound waves, allowing them to attenuate within the internal space of the silencing device. Simultaneously, the flow guide hole 13 further utilizes the principle of resonance silencing to achieve maximum energy dissipation and noise reduction. Therefore, this invention comprehensively utilizes these two technical theories to achieve the goal of noise reduction.

[0070] More specifically, the core components of the device of the present invention mainly include: a wave-damping and sound-absorbing assembly consisting of a manifold outer cylinder 60, an energy-dissipating and impact-bearing block 30, an inner thread short circuit 40, and a wave-damping and sound-absorbing ring 10, which, when assembled, form as shown in the figure. Figure 1-2 The assembly structure shown.

[0071] The basic working principle of the device of this invention is as follows: the outer confluence cylinder 60 is a centralized confluence component. After the ultra-high-speed jet liquid passes through each wave-damping and sound-absorbing ring 10, a portion of the liquid, i.e., the medium, is blocked. This portion of the medium flows out through the guide hole 13 on the wave-damping and sound-absorbing ring 10. At this time, the outflowing liquid may still have a certain diffuse jet counter-pressure, thus causing trouble for liquid collection. Adding the outer confluence cylinder 60 can effectively solve this problem. The energy-dissipating impact block 30, as the name suggests, is for energy dissipation, that is, reducing the terminal impact force (also known as kinetic energy) of the ultra-high pressure jet liquid, allowing the jet beam to be attenuated by multiple wave-damping and sound-absorbing rings 10 before striking the energy-dissipating impact block 30. Figures 8-11 As shown, the energy dissipation and impact bearing block 30 is actually a very thick steel block, so it has a strong impact resistance and a long service life.

[0072] In actual installation, such as Figures 8-11 As shown, a high-pressure connector is threaded onto one side of the adapter flange 20, with the nozzle 21 pressed into the high-pressure connector. On the other side, an internal threaded short connector 40 and a wave-damping and noise-absorbing ring 10 are threaded onto the other side. The internal threaded short connector 40 and the wave-damping and noise-absorbing ring 10 form a series combined connection structure, as shown below. Figure 3As shown. Finally, the tail end of the wave-damping and noise-reducing ring 10 is threaded onto the energy-absorbing and impact-bearing block 30. At the same time, the manifold outer cylinder 60 is fixed to the adapter flange 20 and the energy-absorbing and impact-bearing block 30 respectively by the head set screw 51 and the tail set screw 52. The overall structure is simple, the connection is firm, and it is versatile, allowing for flexible changes in the installation method as needed to better serve the test.

[0073] Of course, from Figure 8 It can be seen that each wave-damping and noise-reducing ring 10 adopts multiple rings connected in series, and each ring is installed in the same direction, that is, the wave-damping warp ring 12 is bent along the jet direction. The process flow and energy dissipation and noise reduction mechanism of this scheme, namely combined scheme 1, are as follows:

[0074] The upstream liquid medium, after being pressurized by the reciprocating motion of the pump driving the plunger, is connected to a high-pressure connector. The high-pressure connector is equipped with a nozzle 21, which has a very small orifice (the orifice size is determined by the required jet pressure and flow rate; generally, if ultra-high pressure is required, i.e., a pressure range of 1000 bar to 6000 bar, the orifice size is typically 0.08 mm to 0.45 mm), commonly known as a "water nozzle." When the liquid medium flows through the nozzle 21, the throttling effect of the fine orifice creates a huge pressure difference across the orifice. Under this pressure difference, the liquid is rapidly released, forming an ultra-high-speed, ultra-high-pressure, small-section cylindrical jet. After this jet is ejected through the nozzle 21, its cohesion rapidly decreases. In the region closest to nozzle 21, the cohesion of the jet is best maintained. Subsequently, the jet gradually diffuses and atomizes, and the diameter of the jet cross-section also increases. Based on this mechanism, this invention uses an energy dissipation and noise reduction device with wave blocking and hysteresis as its core principles. In essence, it can be understood as: how to limit the propagation of the sonic boom generated by a supersonic aircraft when it breaks the speed of sound. This invention provides its own solution to this problem. Of course, correspondingly, "aircraft" needs to be understood as "water jet" in order to be applicable to the device of this invention.

[0075] At this point, after the liquid is ejected through nozzle 21, it diffuses and atomizes, and the diameter of the cylindrical jet cross-section gradually increases. Therefore, during the jetting process, the edge jet after diffusion and atomization is blocked by the hysteresis ring 12 in the wave-damping and noise-absorbing ring 10. The water mist condenses into water and flows out through the guide hole 13 on the wave-damping and noise-absorbing ring 10. Finally, it is collected by the outer confluence cylinder 60 and then flows out through the confluence hole 61 on the outer confluence cylinder 60 for collection and measurement. After the jet is blocked by multiple wave-damping and noise-absorbing rings 10, the amount of liquid retained per unit time will also increase. The larger the diameter of the jet, the more obvious the blocking effect. At this time, the less liquid is carried by the jet hitting the energy-absorbing impact block 30, and therefore the impact force generated by the jet is smaller, thus achieving the purpose of stepped and distributed energy-absorbing and noise-reducing.

[0076] The design of multiple wave-damping and noise-absorbing rings connected in series (10 rings) is also targeted: it facilitates maintenance and replacement, and the series installation method can be reasonably changed according to the test results, referring to... Figures 9-11 The following are three other installation methods: Figure 9 Combination scheme 2 adopts a fully reverse installation, meaning that the bending direction of the hysteresis ring 12 is facing the jet beam. This installation method has a better energy dissipation effect but a poorer noise reduction effect. Figure 10 That is, combination scheme 3 adopts a positive-negative multi-ring series combination method, which can produce a good energy dissipation effect and also has the ability to reduce noise. This is also the best assembly method in this invention. Figure 11 That is, combination scheme 4 adopts the reverse-formal multi-ring series combination method, which can also produce energy dissipation and noise reduction effect.

[0077] Based on the above scheme, the presence of the wave-damping and noise-reducing ring 10 of the present invention is crucial. It incorporates multiple functions, including the "wave-damping and noise reduction" of the hysteresis ring and the "resonance noise reduction" of the guide hole 13. For specific construction, please refer to... Figures 4-6 As shown. Wherein:

[0078] 1. Cross-sectional characteristic curve of hysteresis warp ring 12

[0079] The fitting formula for the cross-sectional characteristic curve of the hysteresis warp ring 12 is as follows:

[0080] Construct a rectangular coordinate system on the axial section of the hysteresis ring 12, with the x-axis as the horizontal line. The outer trumpet surface curve of the hysteresis ring 12 is formed by the combination of the first curve equation f(x) and the second curve equation q(x), and the inner trumpet surface curve of the hysteresis ring 12 is formed by the third curve equation t(x). At this time, the cross-sectional profile of the hysteresis ring 12 located on one side of the axis is represented by the following piecewise function G(x):

[0081]

[0082] The curve formed by the piecewise function G(x) is represented on the coordinate axes as shown in the reference diagram. Figure 12 As shown, the points marked by several letters on the curve enclose the outline of the cross-section on one side of the axis of the hysteresis ring 12; the other side of the axis is symmetrically arranged, and the whole is formed by wrapping the outline around the axis of the hysteresis ring 12; the inner circle of the hysteresis ring 12 forms a passage hole 14.

[0083] 2. Hysteresis ring 12 combination noise reduction characteristics

[0084] (1) Analytical formula for noise reduction characteristics

[0085] Since there are various installation combinations of the hysteresis ring 12, and each combination has a different effect on noise attenuation, we introduce a dimensionless constant ε, the value of which is closely related to the installation combination. For the combinations already determined in this invention... Figures 8-11 The four combinations of the constant take the following values:

[0086]

[0087] Combination scheme 1 is as follows: Figure 8 As shown, when the hysteresis ring 12 in the first-end silencing ring 10 is installed in the positive direction and the hysteresis rings 12 in adjacent silencing rings 10 are in the same direction; combination scheme 2 is as follows Figure 9 As shown, when the hysteresis rings 12 in the first-end wave-blocking and silencing ring 10 are installed in opposite directions and the hysteresis rings 12 in adjacent wave-blocking and silencing rings 10 are in the same direction; combination scheme 3 is as follows: Figure 10 As shown, when the hysteresis ring 12 in the first-end silencing ring 10 is installed in the positive direction and the hysteresis rings 12 in adjacent silencing rings 10 are opposite to each other; combination scheme 4 is as follows Figure 11 As shown, when the hysteresis ring 12 in the first wave-blocking and silencing ring 10 is installed in reverse and the hysteresis rings 12 in adjacent wave-blocking and silencing rings 10 are opposite to each other.

[0088] Considering the role of the non-circular manifold 61 in noise reduction of the outer manifold 60, the equivalent coefficient θ of the outer manifold 60 is defined here:

[0089]

[0090] Where: S is the total area of ​​the manifold 61, K is a coefficient, and is determined by... Figure 13 The curves shown correspond to the values. Figure 13 The horizontal axis of the empirical curve shown represents the aspect ratio of the manifold 61, and the vertical axis represents the coefficient K.

[0091] Since the energy dissipation and noise reduction device of the present invention involves two models, wave-damping type and resonant type, and there are multiple combined installation forms, and the outermost layer also has the multiple functions of the manifold 61, the following analytical formula can be obtained:

[0092] ΔT z =ΔL r ·lnθ+ΔL b ·e ε

[0093] in:

[0094] ΔT Z This represents the noise attenuation value of the ultra-high voltage wave blocking and silencing device.

[0095] ΔL r This represents the resonant noise attenuation value.

[0096] ΔL b This represents the resistive noise attenuation value.

[0097] ΔL r The meaning expressed by lnθ is: Based on the resonant noise reduction, the invention superimposed the outer layer of the confluence hole 61 works together. The result of this combined action is to take the logarithm of the equivalent coefficient θ of the confluence outer cylinder 60 with the natural coefficient as the base. The product of the two is the corrected resonant noise attenuation value.

[0098] ΔL b ·e ε The meaning expressed is: on the basis of resistive noise reduction, the combined effect of multiple installation combinations is superimposed. The result of this combined effect is to take the exponent with the natural coefficient as the base of the dimensionless constant ε, and the product of the two is the corrected resistive noise attenuation value.

[0099] Example Simulation:

[0100] For the four installation combinations in this invention, this invention provides simulation effect diagrams with jet parameters of 200MPa and 0.4L / min. The four combination schemes correspond to the following references. Figures 14-17 As shown.

[0101] Depend on Figures 14-17 As shown, it can be seen that:

[0102] from Figure 14 The simulation of the combined scheme 1 shows that when all the positive arc shapes (i.e., the convex surface of the hysteresis ring 12) are installed, the high noise generated by the ultra-high pressure jet jet in the inner cavity of the wave-damping and noise-absorbing ring 10 due to ultra-high speed friction with the air is poorly blocked from the front. After the jet hits the energy-absorbing impact block 30, the high noise generated by the medium-high speed air friction after the reflected liquid dissipates the energy is better blocked from the back. Therefore, in summary, there is more noise in the range of 75-82dB in the curve, and most of it is concentrated in the range of 75±3dB.

[0103] like Figure 15 Compared to combination scheme 1, scheme 2 improves the frontal blocking effect, focusing on eliminating the high noise generated by the friction of the ultra-high-speed jet in the air. However, it weakens the back-side blocking effect, which reduces the relatively high noise generated by the medium-to-high-speed air friction after the energy dissipation of the reflective liquid. Nevertheless, it effectively improves the overall noise reduction effect. As can be seen from the curves, the noise is concentrated in the 70±3dB range.

[0104] like Figure 16 The combination scheme 3 shown and as follows Figure 17The combination scheme 4 shown incorporates the advantages and disadvantages of the first two schemes. Overall, it effectively eliminates both the high noise generated by the friction of the ultra-high-speed jet in the air and the relatively high noise generated by the medium-to-high-speed air friction after the energy dissipation by the reflective liquid. There are slight differences (the curves show that combination scheme 3 is mostly concentrated at 65±4dB, while combination scheme 4 is mostly concentrated at 68±4dB). This difference is mainly caused by the combined effect of the high noise generated by the friction of the ultra-high-speed jet in the air and the relatively high noise generated by the medium-to-high-speed air friction after the energy dissipation by the reflective liquid, resulting from the subtle changes in the volume of the positive / negative bow-shaped resistive silencing and the resonant cavity. These two schemes are very similar, but the silencing effect is significantly improved compared to combination schemes 1 and 2.

[0105] Regardless of any of the four combination schemes, they all achieve the energy dissipation and noise reduction effect of the high-speed jet's tail flow, which helps to reduce the jet's impact kinetic energy, ensure test safety, and improve test comfort.

[0106] Therefore, the technical advantages of the ultra-high voltage wave-damping and silencing device formed by this invention are as follows:

[0107] 1. This ultra-high pressure wave-damping and noise-reducing device is suitable for the field of ultra-high pressure booster testing. Its function is to reduce the kinetic energy of the ultra-high pressure jet stream and reduce the environmental noise generated by the ultra-high pressure fine-hole high-speed jet, thus playing an auxiliary role in safe testing.

[0108] 2. The ultra-high pressure wave-blocking silencing device adopts a combined theoretical model of resistive silencing and small-hole resonance silencing. The number of wave-blocking silencing rings 10 can be appropriately increased or decreased according to the noise intensity generated by the ultra-high pressure micro-hole high-speed jet. At the same time, each wave-blocking silencing ring 10 is innovatively designed with a hysteresis ring 12. The hysteresis ring 12 plays the role of retaining sound waves, effectively reducing the noise of the supersonic jet beam and control friction.

[0109] 3. The ultra-high pressure wave-blocking and silencing device is also equipped with an energy-dissipating and impact-bearing block 30. When the high-energy ultra-high pressure jet is ejected at high speed through the fine hole, although it passes through multiple wave-blocking and silencing rings 10, the high energy state is released and attenuated to a certain extent. However, this short-distance energy attenuation cannot effectively reduce its destructiveness, and the jet impact force is still huge. In order to effectively reduce the impact and destructive force, the energy-dissipating and impact-bearing block 30 is added.

[0110] 4. The wave-blocking and silencing ring 10 of the ultra-high voltage wave-blocking and silencing device can also be installed in all forward, all reverse, or a combination of forward and reverse directions as needed. That is, whether the bending direction of the ring 12 is with the wave or against the wave, this design can determine the best installation method based on the test results, further improving the flexibility of operation.

[0111] 5. The outer cylinder 60 of the ultra-high pressure wave-damping and silencing device is designed to facilitate the collection of the jet liquid after energy dissipation and to provide convenience for the mass measurement of the jet liquid after the test.

[0112] Therefore, this invention can be applied to ultra-high pressure boosting jet testing devices to dissipate energy and reduce noise in the tail flow of high-speed jets, thereby reducing the impact kinetic energy of the jet. This reduces the noise pollution generated by the high-speed jet due to the large pressure difference before and after the orifice when traditional high-pressure liquid flows through it, which causes friction between the jet boundary and the air, affecting test safety. This invention can be widely used and installed at the jet outlet, such as valves, of ultra-high pressure booster equipment, effectively ensuring the safety of test personnel, reducing environmental noise pollution and test safety risks, and improving test comfort.

[0113] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0114] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0115] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. An ultra-high voltage wave-damping and silencing device, characterized in that: It includes a transition flange (20) with a nozzle (21) arranged sequentially along the axial direction, a wave-damping and sound-absorbing sleeve located on the spray path of the nozzle (21), and an energy-absorbing and impact-bearing block (30) located at the end of the wave-damping and sound-absorbing sleeve; a manifold outer cylinder (60) is also coaxially fitted outside the wave-damping and sound-absorbing sleeve, and there is a gap between the wave-damping and sound-absorbing sleeve and the manifold outer cylinder (60) for temporary storage of the medium, and a manifold hole (61) for the medium to flow out is arranged radially through the manifold outer cylinder (60). The wave-damping and noise-absorbing sleeve is composed of two or more wave-damping and noise-absorbing rings (10) connected coaxially end to end; the wave-damping and noise-absorbing ring (10) includes a ring body (11) with a flow ring cavity, and a hysteresis ring (12) is coaxially arranged in the flow ring cavity; a passage hole (14) for medium to pass through is coaxially opened at the hysteresis ring (12), so that the hysteresis ring (12) is shaped like a horn opening facing one end of the ring body (11); the medium flowing out along the horn surface of the hysteresis ring (12) is discharged through the guide hole (13) opened radially at the ring body (11). Construct a rectangular coordinate system on the axial section of the hysteresis ring (12), and use the equation of the first curve... Second curve equation The outer trumpet surface curve of the combined hysteresis warp ring (12), the equation of the third curve The inner trumpet surface curve of the hysteresis ring (12) is formed by the cross-sectional profile on one side of the axis of the hysteresis ring (12) through the following piecewise function. express: The ring (11) has a three-section stepped shaft shape with a thick middle section and thin ends. The guide hole (13) is opened at the large diameter section of the ring (11), and the small diameter section of the ring (11) is provided with external threads. Adjacent wave-damping and noise-absorbing rings (10) are fastened to each other by coaxially arranged internal thread short circuits (40). Each wave-blocking and noise-absorbing ring (10) is arranged coaxially with each other, and the openings of the hysteresis rings (12) of adjacent wave-blocking and noise-absorbing rings (10) are oriented in the same direction or opposite to each other. Each guide hole (13) is arranged in sequence along the circumference of the ring (11), and the axis of the same pair of guide holes (13) located at both ends of the hysteresis ring (12) is perpendicular to the same generatrix of the ring (11).

2. The ultra-high voltage wave blocking and silencing device according to claim 1, characterized in that: A fixing ring is protruding on the side of the transition flange (20) facing the first end wave-damping and silencing ring. The fixing ring forms a threaded fit with the first end wave-damping and silencing ring located at the first end of the wave-damping and silencing sleeve. At this time, the first end set screw (51) passes through the outer cylinder of the manifold (60) and forms a tight fit with the fixing ring. A positioning ring is protruding on the side of the energy-dissipating impact block (30) facing the tail end wave-damping and silencing ring. The inner ring wall of the positioning ring is arranged with an internal thread section, so as to form a threaded fit with the adjacent end of the tail end wave-damping and silencing ring located at the tail end of the wave-damping and silencing sleeve. At this time, the tail end set screw (52) passes through the outer cylinder of the manifold (60) and forms a tight fit with the outer ring wall of the positioning ring.

3. The ultra-high voltage wave blocking and silencing device according to claim 1, characterized in that: The guide holes (13) are distributed at both ends of the hysteresis ring (12) to receive the medium flowing out along the inner and outer horn surfaces of the hysteresis ring (12), respectively.

4. The ultra-high voltage wave blocking and silencing device according to claim 1 or 2, characterized in that: There are ten wave-damping and noise-absorbing rings (10).

5. A method for calculating noise attenuation, wherein the method applies an ultra-high voltage wave blocking silencing device as described in claim 1, characterized in that: Noise attenuation value of ultra-high voltage wave blocking silencing device The following formula can be used to calculate: in: This represents the resonant noise attenuation value. For the equivalent coefficient of the outer cylinder (60) of the confluence, ,in The total area of ​​the manifold (61) For coefficients; This represents the resistive noise attenuation value. It is a dimensionless constant; with the direction in which the opening of the hysteresis ring (12) faces the nozzle (21) as the positive direction of installation, then: When the hysteresis ring (12) in the first wave-blocking and silencing ring (10) is installed in the positive direction and the hysteresis rings (12) in adjacent wave-blocking and silencing rings (10) are in the same direction, =0.78; When the hysteresis rings (12) in the first wave-blocking and silencing ring (10) are installed in opposite directions and the hysteresis rings (12) in adjacent wave-blocking and silencing rings (10) are in the same direction, =0.80; When the hysteresis ring (12) in the first wave-blocking and silencing ring (10) is installed in the positive direction and the hysteresis rings (12) in adjacent wave-blocking and silencing rings (10) are opposite to each other, =0.85; When the hysteresis rings (12) in the first wave-blocking silencing ring (10) are installed in reverse and the hysteresis rings (12) in adjacent wave-blocking silencing rings (10) are opposite to each other, =0.

87.

6. The noise attenuation calculation method according to claim 5, characterized in that: Resonant noise attenuation value The calculation formula is as follows: in: k is a dimensionless value; Conductivity is a physical quantity expressed in units of length. S is the volume of the inner cavity of the wave-blocking and silencing sleeve assembly; S is the cross-sectional area of ​​the internal cavity channel of the ultra-high pressure wave-blocking and silencing device; n is the number of guide holes (13); d is the diameter of the guide hole (13); The depth of the guide hole (13); This is the inherent frequency of the ultra-high voltage wave blocking and silencing device. It is the resonant frequency; Speed ​​of sound; The perforation rate is the ratio of the area of ​​all the guide holes (13) on the wave-damping and sound-absorbing sleeve to the outer surface area of ​​the wave-damping and sound-absorbing sleeve. The thickness of the air layer in the gap between the wave-damping and noise-absorbing sleeve and the outer cylinder (60) of the busbar.

7. The noise attenuation calculation method according to claim 5, characterized in that: resistive noise attenuation value The calculation formula is as follows: in: To match the sound absorption coefficient of the material The relevant sound absorption coefficient; The positive incident sound absorption coefficient; The effective length of the ultra-high pressure wave-damping silencing device is the distance from the nozzle (21) outlet to the impact end of the energy-absorbing impact block (30). The diameter of the ring is the inner diameter of the wave-blocking and noise-absorbing ring (10) minus the inner diameter of the hysteresis ring (12).

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