Soundproofing duct for use in a vacuum tank and vacuum tank

Abstract

The present application relates to the technical field of vacuum sound attenuation device, and discloses a sound insulation pipeline in a vacuum box and the vacuum box. The sound insulation pipeline in the vacuum box comprises a fluid inlet joint, a sound attenuation unit and a fluid outlet joint. The acoustic impedance of the material used for the fluid inlet joint is greater than that of the material used for the sound attenuation unit, and the acoustic impedance of the material used for the fluid outlet joint is greater than that of the material used for the sound attenuation unit. The structure is simple, the characteristics of sound are fully utilized, the vacuum and propagation channel design are combined, the sound is reflected and absorbed from two sound propagation paths, the sound propagation path is prolonged, the sound wave energy is retained, and the sound is gradually attenuated until it disappears, so that the sound attenuation and sound insulation purposes are achieved. The sound attenuation and sound insulation effect is obviously improved compared with the existing simple vacuum box and sound insulation layer. The sound insulation and sound attenuation device can adapt to various sound systems and social noise environmental protection sound insulation and sound attenuation requirements.

Description

Technical Field

[0001] This invention relates to the field of vacuum silencing devices, and more particularly, to a sound-insulating pipe for use within a vacuum chamber. Furthermore, this invention also relates to a vacuum chamber comprising the aforementioned sound-insulating pipe for use within a vacuum chamber. Background Technology

[0002] With the development of technology, the application of various sound systems is becoming increasingly widespread. This necessitates improving the efficiency of sound source utilization and preventing excessive sound diffusion. Simultaneously, society's demands for noise reduction and environmental protection are also increasing, requiring control over the generation and propagation of sound. Both of these factors place increasingly higher demands on sound insulation and sound absorption technologies.

[0003] Sound insulation and sound absorption technologies often utilize vacuum. Since sound waves require a medium to propagate, using a vacuum for sound insulation is undoubtedly the most effective method. However, the problem lies in the fact that many devices, during operation, constantly exchange fluids with the external environment through pipes. Sound waves can then propagate through this channel, transmitting the sound energy of the internal sound source to the outside of the vacuum chamber, or vice versa.

[0004] While conventional sound-absorbing cotton and cloth can control the propagation of sound waves from pipes to the outside, they are ineffective against sound energy propagating inside fluids or directly through the pipe walls. Especially under the aforementioned vacuum conditions, where the outside of the pipe is a vacuum and sound waves cannot propagate, wrapping the pipe with sound-absorbing cotton or cloth is of little use. Summary of the Invention

[0005] This invention provides a soundproof pipe and a vacuum chamber for use inside a vacuum chamber. The structure is simple and practical. The soundproof pipe is installed in the piping system inside the vacuum chamber, which can reduce the sound energy transmitted through the pipe, thereby achieving a better sound insulation effect. This solves the technical problem that existing sound insulation and sound absorption technologies are not effective and cannot meet the application requirements of sound systems and noise and environmental protection requirements.

[0006] According to one aspect of the present invention, a soundproof pipe for use in a vacuum chamber is provided, comprising a fluid inlet connector, a silencing unit, and a fluid outlet connector, wherein the acoustic impedance of the material used for the fluid inlet connector is greater than the acoustic impedance of the material used for the silencing unit, and the acoustic impedance of the material used for the fluid outlet connector is greater than the acoustic impedance of the material used for the silencing unit.

[0007] Furthermore, the acoustic impedance of the materials used for both the fluid inlet and outlet fittings is greater than 4.5 × 10⁻⁶. 6 g / ㎝ 2 The acoustic impedance of the material used in the noise reduction unit is less than 0.4 × 10⁻⁶. 6 g / ㎝ 2 s.

[0008] Furthermore, at least one of the following locations is provided: between the fluid inlet connector and the silencing unit, between the silencing unit and the fluid outlet connector, at the inlet end of the fluid inlet connector, and at the outlet end of the fluid outlet connector; both sides of the double-sided connecting flange are provided with threaded blind holes; or one side of the double-sided connecting flange is provided with threaded blind holes, and the other side is provided with threaded connection ports; or the double-sided connecting flange is provided with through holes, and each through hole is used for connection at only one end while the other end is left unused.

[0009] Furthermore, the silencing unit includes a four-way connector and a pipe sound-absorbing cover. The first and second connectors of the four-way connector are arranged opposite each other, and the third and fourth connectors of the four-way connector are arranged opposite each other. The first connector is a fluid input connector, the third connector is a fluid output connector, and the second and fourth connectors are respectively connected to the corresponding pipe sound-absorbing covers.

[0010] Furthermore, a Venturi tube is installed inside the third joint.

[0011] Furthermore, the silencing unit is provided in multiple sets; adjacent sets of silencing units are connected to each other through the first connector of the first set of silencing units and the third connector of the second set of silencing units.

[0012] Furthermore, the silencing unit is provided in multiple sets; adjacent sets of silencing units are connected by straight pipes.

[0013] Furthermore, the straight-through pipe uses a Venturi tube.

[0014] Furthermore, the silencing unit includes a four-way connector and a pipe sound-absorbing cover. The first and second connectors of the four-way connector are arranged opposite each other, and the third and fourth connectors of the four-way connector are arranged opposite each other. The first connector is a fluid inlet connector, the second connector is a fluid outlet connector, and the third and fourth connectors are respectively connected to the corresponding pipe sound-absorbing covers. The second connector is set as a Venturi tube.

[0015] According to another aspect of the invention, a vacuum chamber is also provided, which includes the aforementioned sound-insulating pipe for use within the vacuum chamber.

[0016] The present invention has the following beneficial effects:

[0017] This invention relates to a soundproofing pipe installed inside a vacuum chamber. The pipe mainly comprises a fluid inlet connector, a silencing unit, and a fluid outlet connector, with each of these components sequentially connected to form a pipe structure. Since the outside of the pipe structure is within the vacuum environment of the chamber, the generated sound primarily propagates through the pipe structure and the internal fluid. When a vacuum environment is created inside the chamber, a portion of the sound propagation occurs through the fluid inlet connector, silencing unit, fluid outlet connector, and vacuum chamber. Firstly, the different acoustic impedances of the fluid inlet connector, silencing unit, and fluid outlet connector abruptly affect the sound velocity, reflection and refraction, and sound wave attenuation rate during propagation, thus hindering and reducing sound propagation and effectively preventing sound from spreading outside the vacuum chamber. Secondly, the acoustic impedance of the material used for the fluid inlet connector is greater than that of the material used for the silencing unit, and the acoustic impedance of the material used for the fluid outlet connector is greater than that of the material used for the silencing unit. The acoustic impedance of the material is utilized, meaning the acoustic impedance is low in the middle of the tube structure and high at both ends. Sound first passes through the high-impedance fluid inlet connector, where it is reflected and absorbed. Only the transmitted portion enters and propagates to the silencing unit via the fluid inlet connector. Sound propagating through the low-impedance silencing unit is reflected, absorbed, and attenuated back and forth between the high-impedance fluid inlet and outlet connectors, thus isolating and eliminating sound and effectively preventing sound from propagating outside the vacuum chamber. When a vacuum environment is created inside the vacuum chamber, another part of the sound propagation path is through the fluid within the tube structure. The fluid passes through at least one silencing unit, where it radiates, retains, and absorbs sound wave energy, thus silencing and insulating the sound and preventing sound from propagating through the fluid. This invention relates to a soundproofing pipe for use within a vacuum chamber. It features a simple structure that fully utilizes the characteristics of sound. By combining vacuum with a propagation channel design, it reflects and absorbs sound from both propagation paths, extending the sound path, retaining sound wave energy, and gradually attenuating the sound until it disappears, thus achieving noise reduction and sound insulation. The noise reduction and sound insulation effect is significantly improved compared to existing methods that simply use vacuum chambers and sound insulation layers. It can adapt to various sound systems and meet the noise reduction and sound insulation needs and requirements of social noise reduction and environmental protection.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is one of the structural schematic diagrams of a soundproof pipe used in a vacuum chamber according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly structure of the double-sided connecting flange according to a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a double-sided connecting flange with blind holes on both sides according to a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a double-sided connecting flange with a through hole according to a preferred embodiment of the present invention;

[0024] Figure 5 This is a second schematic diagram of the structure of the soundproof pipe used in the vacuum chamber according to a preferred embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of the pipe sound-absorbing cover according to a preferred embodiment of the present invention.

[0026] Legend:

[0027] 100. Fluid inlet connector; 200. Silencing unit; 201. Four-way connector; 2011. First connector; 2012. Second connector; 2013. Third connector; 2014. Fourth connector; 202. Pipe sound-absorbing cover; 300. Fluid outlet connector; 400. Double-sided connection flange; 401. Blind hole; 402. Threaded connection port; 403. Through hole; 500. Straight pipe. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0029] Figure 1 This is one of the structural schematic diagrams of a soundproof pipe used in a vacuum chamber according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the double-sided connecting flange according to a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a double-sided connecting flange with blind holes on both sides according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a double-sided connecting flange with a through hole according to a preferred embodiment of the present invention; Figure 5 This is a second schematic diagram of the structure of the soundproof pipe used in the vacuum chamber according to a preferred embodiment of the present invention; Figure 6 A schematic diagram of the structure of the pipe sound-absorbing cover according to a preferred embodiment of the present invention.

[0030] like Figure 1As shown, the soundproof pipe for use in a vacuum chamber in this embodiment includes a fluid inlet connector 100, a silencing unit 200, and a fluid outlet connector 300. The acoustic impedance of the material used for the fluid inlet connector 100 is greater than that of the material used for the silencing unit 200, and the acoustic impedance of the material used for the fluid outlet connector 300 is also greater than that of the material used for the silencing unit 200. This invention provides a soundproof pipe for use in a vacuum chamber, which is installed inside the vacuum chamber and mainly includes a fluid inlet connector 100, a silencing unit 200, and a fluid outlet connector 300. A fluid inlet connector 100, at least one silencing unit 200, and a fluid outlet connector 300 are sequentially connected to form a pipe structure. Since the outside of the pipe structure is in the vacuum environment inside the vacuum chamber, the generated sound mainly propagates through the pipe structure and the internal fluid. When a vacuum environment is created inside the vacuum chamber, part of the sound propagation path involves the fluid inlet connector 100, the silencing unit 200, the fluid outlet connector 300, and the vacuum chamber. Firstly, the different acoustic impedances of the fluid inlet connector 100, the silencing unit 200, and the fluid outlet connector 300 abruptly affect the speed of sound, reflection and refraction, and sound wave attenuation during propagation, thus hindering and reducing sound propagation and effectively preventing sound from spreading outside the vacuum chamber. Secondly, the acoustic impedance of the material used for the fluid inlet connector 100 is greater than that of the material used for the silencing unit 200, and the acoustic impedance of the material used for the fluid outlet connector 300 is also greater than that of the silencing unit 200. The acoustic impedance of the material used is low in the middle of the tube structure and high at both ends. Sound first passes through the high-impedance fluid inlet connector 100, where it is reflected and absorbed. Only the transmitted portion enters and propagates to the silencing unit 200 via the fluid inlet connector 100. The sound propagating through the low-impedance silencing unit 200 is reflected, absorbed, and attenuated back and forth between the high-impedance fluid inlet connector 100 and fluid outlet connector 300, thus isolating and eliminating sound and effectively preventing sound from propagating outside the vacuum chamber. When a vacuum environment is created inside the vacuum chamber, another part of the sound propagation path is through the fluid within the tube structure. The fluid passes through at least one silencing unit, which radiates, retains, and absorbs sound wave energy, thus silencing and insulating the sound and preventing sound propagation through the fluid. This invention relates to a soundproofing pipe for use within a vacuum chamber. It features a simple structure that fully utilizes the characteristics of sound. By combining vacuum with a propagation channel design, it reflects and absorbs sound from both propagation paths, extending the sound path, retaining sound wave energy, and gradually attenuating the sound until it disappears, thus achieving noise reduction and sound insulation. The noise reduction and sound insulation effect is significantly improved compared to existing methods that simply use vacuum chambers and sound insulation layers. It can adapt to various sound systems and meet the noise reduction and sound insulation needs and requirements of social noise reduction and environmental protection.Optionally, the silencing unit 200 can be configured as a single set; or multiple sets of silencing units 200 can be configured, and the multiple sets of silencing units 200 can be connected to each other by means of first-to-last connection or by means of pipes or other methods. Optionally, the sound insulation pipe used in the vacuum chamber is L-shaped, U-shaped, Z-shaped; or S-shaped, with multiple bends arranged in a reciprocating manner.

[0031] In this embodiment, the acoustic impedance of the materials used for the fluid inlet connector 100 and the fluid outlet connector 300 is greater than 4.5 × 10⁻⁶. 6 g / ㎝ 2 The acoustic impedance of the material used in the noise reduction unit 200 is less than 0.4 × 10⁻⁶. 6 g / ㎝ 2 Because the acoustic impedance of the silencing unit 200 differs from that of the fluid inlet connector 100 and the fluid outlet connector 300 by more than 10 times, the acoustic impedance of the fluid inlet connector 100 and the fluid outlet connector 300 is greater than 4.5 × 10⁻⁶. 6 g / ㎝ 2 The sound reflection and absorption of s are optimized, and the sound transmittance is greatly reduced. The acoustic impedance of the silencing unit 200 is less than 0.4 × 10⁻⁶. 6 g / ㎝ 2 The sound is reflected between the fluid inlet connector 100 and the fluid outlet connector 300, prolonging the sound propagation path and thus gradually absorbing and reducing the sound. This results in very little sound energy being transmitted to the vacuum chamber through the soundproofing pipe used in this invention. Furthermore, since the environment surrounding the soundproofing pipe in the vacuum chamber is a vacuum, installing this soundproofing pipe significantly improves the sound insulation and noise reduction effect. Optionally, the materials of the fluid inlet connector 100 and the fluid outlet connector 300 can be annealed carbon steel, 347 stainless steel, 430 stainless steel, super-hard alloy steel, tungsten steel, or tungsten carbide. Optionally, the materials of the fluid inlet connector 100 and the fluid outlet connector 300 can be the same or different. Optionally, the material of the noise reduction unit 200 can be PMMA, polyethylene, cork, or soft rubber.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, in this embodiment, at least one of the following locations is provided: between the fluid inlet connector 100 and the silencing unit 200, between the silencing unit 200 and the fluid outlet connector 300, at the inlet end of the fluid inlet connector 100, and at the outlet end of the fluid outlet connector 300. By adding the double-sided connecting flange 400, and achieving separation of the two sides through the double-sided connecting flange 400, abrupt changes in the sound velocity, reflection and refraction, and sound wave attenuation rate are generated, thereby hindering and reducing the propagation of sound and effectively preventing sound from propagating outside the vacuum chamber. In addition, the double-sided connecting flange 400 can achieve adaptive connections on both sides, including diameter-changing connections and connector conversions, making the sound insulation pipe used in the vacuum chamber more adaptable and improving its versatility. Optionally, as Figure 3 As shown, the double-sided flange 400 has threaded blind holes 401 evenly distributed on both sides. Connections are made through these blind holes 401 on both sides of the double-sided flange 400, and the connecting parts on both sides are not directly connected to each other, thus effectively hindering sound transmission to a certain extent. Optionally, one side of the double-sided flange 400 has threaded blind holes 401, and the other side has threaded connection ports 402; connections are made through different connection methods on both sides of the double-sided flange 400, and the connecting parts on both sides are not directly connected to each other, thus also effectively hindering sound transmission to a certain extent. Optionally, as... Figure 4 As shown, the double-sided connecting flange 400 is provided with through holes 403, and each through hole 403 is used for connection at only one end while the other end is empty. Connections are made through different through holes 403 on both sides of the double-sided connecting flange 400, and the connection parts on the two sides are not directly connected to each other, thus hindering sound transmission to a certain extent. Optionally, the material of the double-sided connecting flange 400 can be one of annealed carbon steel, 347 stainless steel, 430 stainless steel, super-hard alloy steel, tungsten steel, tungsten carbide, PMMA, polyethylene, cork, or soft rubber. Optionally, the material of the double-sided connecting flange 400 can be the same as or different from the material of the fluid inlet connector 100, or the material of the double-sided connecting flange 400 can be the same as or different from the material of the silencer unit 200, or the material of the double-sided connecting flange 400 can be the same as or different from the material of the fluid outlet connector 300. Optionally, a sealing ring is provided at least one of the following locations: between the double-sided connecting flange 400 and the fluid inlet connector 100, between the double-sided connecting flange 400 and the silencer unit 200, and between the double-sided connecting flange 400 and the fluid outlet connector 300.

[0033] like Figure 1As shown, in this embodiment, the silencing unit 200 includes a four-way connector 201 and a pipe sound-absorbing cover 202. The first connector 2011 and the second connector 2012 of the four-way connector 201 are arranged opposite to each other, and the third connector 2013 and the fourth connector 2014 of the four-way connector 201 are arranged opposite to each other. The first connector 2011 is a fluid input connector, the third connector 2013 is a fluid output connector, and the second connector 2012 and the fourth connector 2014 are respectively connected to the corresponding pipe sound-absorbing cover 202. The first connector 2011, which serves as the fluid input connector, is arranged opposite to the corresponding pipe sound-absorbing cover 202, and the third connector 2013, which serves as the fluid output connector, is also arranged opposite to the corresponding pipe sound-absorbing cover 202. By adopting this relative relationship, the sound wave energy entering the inner cavity of the pipe sound-absorbing cover 202 is processed through the pipe sound-absorbing cover 202. Specifically, the sound wave energy entering the inner cavity forms frequent reflections, so that the sound wave energy is retained in the inner cavity of the pipe sound-absorbing cover 202 and is continuously reduced and absorbed, thereby achieving the purpose of sound insulation and noise reduction.

[0034] In this embodiment, the pipe sound-absorbing cover 202 is located at the end or corner of the sound-insulating pipe used in the vacuum box, forming a dead water zone at the edge of the main channel. The pipe sound-absorbing cover 202 is located in the main direction of sound wave propagation. The pipe sound-absorbing cover 202 includes an end plate and a cylinder, and the end plate and the cylinder enclose a cavity structure. Multiple conical elastic protrusions are densely arranged in the cavity structure and on the end plate. The conical elastic protrusions are conical and contact the sound and sound wave energy entering the cavity structure with their conical surfaces. When fluid flows towards the end or corner of the pipe, it impacts and enters the cavity structure, coming into contact with the densely arranged conical elastic protrusions, the inner wall of the end plate, and the inner wall of the cylinder. On one hand, the incoming sound waves undergo frequent reflections; the multi-level and multiple reflections of the densely arranged conical surfaces provide better protection, thus trapping the sound wave energy within the cavity structure. This energy is then absorbed by the conical elastic protrusions and fluid vibrations, preventing the sound wave energy from returning to the main flow path. The dead water zone formed by the pipe sound-absorbing cover offers minimal resistance to the main flow path while continuously consuming the sound energy within the fluid, achieving sound absorption and thus better sound insulation. On the other hand, the use of elastic conical protrusions can suppress the instability and turbulence of the fluid entering the dead water zone to a certain extent. More specifically, the elasticity of the densely arranged conical elastic protrusions generates a damping effect to reduce fluid velocity and change fluid direction, thereby dispersing fluid velocity and pressure, reducing fluid instability and turbulence, absorbing vibration energy, and reducing fluid fluctuations, thus suppressing fluid instability and turbulence. The entire structure is simple and low-cost. By being placed at the end or corner of a pipeline system, it can effectively reduce or even block the transmission of sound wave energy, thereby achieving the purpose of noise reduction and sound insulation. It also reduces fluid instability and turbulence, with minimal impact on the flow of the main fluid channel. Optionally, the conical elastic protrusion adopts a conical or pyramidal structure. By changing the cone shape, density, length, taper, and other parameters of the conical elastic protrusion, it can adapt to sound wave noise reduction and sound insulation for different sound wave frequency ranges. Optionally, the pipe sound-absorbing cover is made of rubber or plastic and integrally molded using injection molding, compression molding, or pressure injection processes. Optionally, to facilitate connection with the pipeline system, the outer wall of the pipe sound-absorbing cover cylinder can be provided with external threads; or the end plate of the pipe sound-absorbing cover can be provided with a connecting flange; or connecting holes or connecting clips can be provided on the end plate of the pipe sound-absorbing cover. Optionally, for small pipe sound-absorbing covers, raised and recessed patterns can be provided on the outer periphery of the end plate for easy maintenance and replacement. Optionally, for medium and large-sized pipe sound-absorbing covers, the end plate body can be designed as a circular or polygonal flange. Optionally, conical elastic protrusions can also be arranged on the inner wall surface of the cylinder.Multiple conical elastic protrusions are densely arranged on the end plate body. Specifically, the gap between two adjacent conical elastic protrusions is very small, for example, less than 1 / 2 to 1 / 10 of the bottom radius of the conical elastic protrusion; or the two adjacent conical elastic protrusions are arranged close together; or the two adjacent conical elastic protrusions are partially overlapped.

[0035] In this embodiment, the bottom radius of the conical elastic protrusion is 5mm-50mm, the height of the conical elastic protrusion is 30mm-100mm, and the cone angle of the conical elastic protrusion is 5°-30°. Based on the axial and radial dimensions of the cylinder and the frequency range of sound waves within the pipe, the bottom radius, height, and cone angle of the conical elastic protrusion are selected accordingly to maximize the reduction of sound wave energy and achieve the best sound insulation and noise reduction effect. The cone-shaped elastic protrusions are densely arranged, and the cone angle of the cone-shaped elastic protrusions is 5°-30°, which makes the contact surface between the cone-shaped elastic protrusions and the sound very small. By reducing the contact surface between the sound and the cone-shaped elastic protrusions, a certain sound reduction effect can be achieved. When the sound encounters a small contact surface, part of the sound will be reflected, while the other part will be absorbed. By reducing the contact surface, the part of the sound that is reflected can be reduced, thereby reducing the intensity of the sound. At the same time, the large number of densely arranged cone-shaped elastic protrusions forms a multi-faceted and comprehensive reflection, absorption and weakening of the sound, thereby achieving the effect of sound insulation and sound reduction. When the cone angle of the cone elastic protrusion is too small, less than 5°, the manufacturing cost and difficulty will increase, and the cone elastic protrusion will have difficulty contacting the sound waves, resulting in a low sound reflectivity and making it difficult to achieve the effect of sound insulation and noise reduction. When the cone angle of the cone elastic protrusion is too large, greater than 30°, the contact area between the cone surface of the cone elastic protrusion and the sound and sound waves will increase. However, due to the size limitation of the end plate as a carrier, the number of cone elastic protrusions will be reduced, which will lead to a significant reduction in the effect of sound reflection, absorption and attenuation, and thus a significant reduction in the effect of noise reduction and sound insulation.

[0036] In this embodiment, the tip of the conical elastic protrusion is recessed into the inner cavity below the end face of the cylinder, and the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder is 5mm-30mm. This allows sound to enter the stagnant water zone formed by the inner cavity, and then achieve noise reduction and sound insulation through the frequent reflection, absorption, and attenuation effects of the densely arranged conical elastic protrusions. At the same time, after the fluid enters the stagnant water zone, there is a buffer distance before it comes into contact with the densely arranged conical elastic protrusions, which can reduce the probability of fluid instability and turbulence, thereby reducing the impact on the fluid in the pipe. When the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder is too small, less than 5mm, it will increase the probability of fluid instability and turbulence. When the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder is too large, greater than 30mm, the sound and sound wave energy will continue to flow with the fluid without contacting the conical elastic protrusion, thereby reducing the noise reduction and sound insulation effect.

[0037] like Figure 6As shown, in this embodiment, a insertion hole is provided on the side of the end plate away from the inner cavity. The insertion hole and the conical elastic protrusion are arranged opposite each other, so that the conical elastic protrusion has a hollow structure. The hollow structure of the conical elastic protrusion, combined with its own elasticity, will generate disordered vibrations, which will interfere with the propagation of sound and thus block the transmission of sound; it will form a damping effect on the sound, absorb the sound energy, and convert the sound energy into other forms of energy, thereby reducing the intensity and propagation distance of the sound, so that the sound wave energy is retained in the inner cavity and weakened and absorbed. At the same time, combined with the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder being 5mm-30mm, while achieving the effects of noise reduction and sound insulation, it can also effectively reduce the probability of fluid instability and turbulence. The pipe sound-absorbing cover also includes an adjusting back plate, on which a plug-in rod matching the insertion hole is arranged. The elasticity and stiffness of the conical elastic protrusion are adjusted by the plug-in cooperation between the plug-in rod and the insertion hole. The hollow structure of the cone-shaped elastic protrusion also has drawbacks and limitations. When facing different channel environments, fluid flow rates, fluid velocities, sound frequencies, etc., it is necessary to appropriately adjust the elasticity and stiffness of the cone-shaped elastic protrusion, and even adjust the elasticity and stiffness of the cone-shaped elastic protrusion in a certain direction. By adding an adjustment back plate, the plug rod of the adjustment back plate is inserted into the plug hole to form a composite cone-shaped elastic protrusion, thereby adjusting the elasticity and stiffness of the cone-shaped elastic protrusion to meet the needs of noise reduction and sound insulation, so as to achieve the best noise reduction and sound insulation effect. Plug-in composite structures offer certain advantages over hollow structures in noise reduction, especially in high-frequency noise reduction. By layering different materials together, plug-in composite structures can effectively control sound propagation, thereby improving noise reduction capabilities. Specifically, this includes: resonant frequency suppression (the difference in resonant frequencies between different materials effectively suppresses resonance, thus reducing noise); porous material sound absorption (porous materials in the plug-in composite structure, such as mineral wool and cellulose, effectively absorb sound energy, improving noise reduction performance); damping effect (damping materials in the plug-in composite structure, such as rubber and silicone, reduce structural vibration, thereby reducing the generation and propagation of sound waves); and air layer sound insulation (the air layer in the plug-in composite structure effectively hinders the propagation of sound waves, thus improving noise reduction capabilities).

[0038] like Figure 6As shown, in this embodiment, the back plate and end plate are coaxially arranged, and the back plate and end plate are equipped with a spacing adjustment mechanism and a relative rotation adjustment mechanism. The spacing adjustment mechanism controls the spacing between the back plate and end plate, specifically controlling the combined strength of the insertion fit between the plug rod and the plug hole, thereby adjusting the elasticity and stiffness of the conical elastic protrusion. The relative rotation adjustment mechanism adjusts the relative rotation between the back plate and end plate, causing the plug rod to fit circumferentially with the plug hole, thus changing the combined strength in a certain direction. Different adjustment sequences of the spacing adjustment mechanism and the relative rotation adjustment mechanism result in different composite structures, adapting to different channel environments, fluid flow rates, fluid speeds, sound frequencies, etc., to achieve optimal noise reduction and insulation effects. Furthermore, this adjustment can adapt to changes in the environment. Optionally, the spacing adjustment mechanism can be automatically controlled using cylinders, hydraulic cylinders, motors, etc. Optionally, the relative rotation adjustment mechanism can be automatically controlled using servo motors, rotary motors, etc.

[0039] like Figure 6 As shown, in this embodiment, the spacing adjustment mechanism includes a central shaft rod arranged on the central axis of the end plate and rotatable circumferentially, a positioning nut threaded onto the central shaft rod, and a locking nut threaded onto the central shaft rod; the center of the adjustment back plate has a through hole for the central shaft rod to pass through. The positioning nut is used to first position the axial position, and fine-tuning and precise adjustment can be achieved by rotating the plate a few times. The adjustment back plate slides through the through hole onto the central shaft rod and abuts against the positioning nut, and then is locked in place with the locking nut, thereby completing the adjustment of the axial spacing between the adjustment back plate and the end plate; and the adjusted adjustment back plate rotates circumferentially with the central shaft rod. The central shaft rod is embedded into the end plate body through a rotating slider at its end, thereby achieving axial limitation between the central shaft rod and the end plate body. Simultaneously, the central shaft rod can still rotate circumferentially within the end plate body, facilitating circumferential rotation adjustment and circumferential locking relative to the rotation adjustment mechanism.

[0040] like Figure 6As shown, in this embodiment, the relative rotation adjustment mechanism includes an arc-shaped hole on the adjustment back plate, a fixing rod arranged on the end plate, and a fixing nut threaded onto the fixing rod for locking the fixing rod to the adjustment back plate. The fixing rod of the end plate passes through the arc-shaped hole and can rotate circumferentially within the arc-shaped hole. After circumferential rotation adjustment, it is fixed and locked by the fixing nut; more specifically, the fixing nut is used in conjunction with the spacing adjustment mechanism to achieve fixed locking. Optionally, multiple sets of relative rotation adjustment mechanisms are arranged, and the multiple sets of relative rotation adjustment mechanisms are evenly spaced along the circumference of the adjustment back plate to achieve stable locking and maintain the structural stability after locking. Optionally, the fixing nut may also include two nuts, which are located at opposite ends of the arc-shaped hole, one nut for positioning and the other for locking.

[0041] In this embodiment, a Venturi tube is arranged inside the third connector 2013. Utilizing the special structure of the Venturi tube, a certain fluid resistance is created, causing fluid and sound to be trapped within the cavity of the silencing unit 200. More specifically, the sound is trapped in the pipe sound-absorbing cover 202, and through frequent reflection, absorption, and consumption by the pipe sound-absorbing cover 202, the sound is absorbed, achieving a better sound insulation effect. The Venturi tube also increases fluid velocity; due to its special structure, the cross-sectional area of ​​the fluid decreases as it flows through, thus increasing the airflow velocity. Furthermore, the Venturi tube reduces fluid noise by increasing fluid velocity, thereby altering the eddy and turbulent flow state and helping to reduce airflow noise.

[0042] In this embodiment, multiple sets of silencing units 200 are provided; adjacent sets of silencing units 200 are connected via a first connector 2011 of the first set of silencing units 200 and a third connector 2013 of the second set of silencing units 200. Different application environments generate different sounds and sound wave energies, and using only one set of silencing units 200 may not completely eliminate sound propagating through the fluid. Therefore, it is necessary to add additional silencing units 200 to improve the silencing and sound insulation effect. Furthermore, adding silencing units 200 can also be used to change the direction of the fluid.

[0043] like Figure 1 and Figure 5 As shown, in this embodiment, multiple sets of silencing units 200 are provided; adjacent sets of silencing units 200 are connected by a straight pipe 500. Different application environments generate different sounds and sound wave energies. Using only one set of silencing units 200 may not completely eliminate sound propagating through the fluid. Therefore, it is necessary to add more silencing units 200 to improve the silencing and sound insulation effect. In addition, adding silencing units 200 can also be used to change the fluid direction and extend the fluid path.

[0044] In this embodiment, the straight pipe 500 is a Venturi tube. Utilizing the special structure of the Venturi tube, a certain fluid resistance is created, causing the fluid and sound to be trapped within the cavity of the silencing unit 200. More specifically, the sound is trapped in the pipe sound-absorbing cover 202, and through frequent reflection, absorption, and consumption by the cover, sound absorption is achieved, resulting in better sound insulation. The Venturi tube also increases fluid velocity; due to its special structure, it reduces the cross-sectional area through which the fluid flows, thus increasing the airflow velocity. Furthermore, the Venturi tube reduces fluid noise by increasing fluid velocity, thereby altering the eddy and turbulent flow state and helping to reduce airflow noise.

[0045] like Figure 5 As shown, in this embodiment, the silencing unit 200 includes a four-way connector 201 and a pipe sound-absorbing cover 202. The first connector 2011 and the second connector 2012 of the four-way connector 201 are arranged opposite to each other, and the third connector 2013 and the fourth connector 2014 of the four-way connector 201 are arranged opposite to each other. The first connector 2011 is a fluid input connector, the second connector 2012 is a fluid output connector, and the third connector 2013 and the fourth connector 2014 are respectively connected to the corresponding pipe sound-absorbing cover 202. The second connector 2012 is configured as a Venturi tube. Utilizing the unique structure of the Venturi tube, a certain fluid resistance is created, causing fluid and sound to be trapped within the cavity of the silencing unit 200. More specifically, sound is trapped within the pipe sound-absorbing cover 202, and through frequent reflection, absorption, and dissipation by the cover, sound absorption is achieved, resulting in better sound insulation. The Venturi tube also increases fluid velocity; its unique structure reduces the cross-sectional area of ​​the fluid, thus increasing airflow speed. Furthermore, the Venturi tube reduces fluid noise by altering the eddy and turbulent flow state, thus reducing airflow noise. Based on the Venturi tube's function at the fluid output connector, the sound wave energy entering the cavity of the pipe sound-absorbing cover 202 is processed. Specifically, the sound wave energy entering the cavity undergoes frequent reflection, causing it to be trapped within the cover and continuously attenuated and absorbed, thereby achieving sound insulation and silencing.

[0046] The vacuum chamber of this embodiment includes the aforementioned soundproofing pipe for use inside the vacuum chamber.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A soundproof pipe for use in a vacuum chamber, characterized in that, It includes a fluid inlet connector (100), a silencer unit (200), and a fluid outlet connector (300). The acoustic impedance of the material used in the fluid inlet connector (100) is greater than that of the material used in the silencing unit (200), and the acoustic impedance of the material used in the fluid outlet connector (300) is greater than that of the material used in the silencing unit (200). The acoustic impedance of the materials used for the fluid inlet connector (100) and the fluid outlet connector (300) is greater than 4.5 × 10⁻⁶. 6 g / ㎝ 2 The acoustic impedance of the material used in the noise reduction unit (200) is less than 0.4 × 10⁻⁶. 6 g / ㎝ 2 s; The silencing unit (200) includes a four-way connector (201) and a pipe sound-absorbing cover (202). The first connector (2011) and the second connector (2012) of the four-way connector (201) are arranged opposite to each other, and the third connector (2013) and the fourth connector (2014) of the four-way connector (201) are arranged opposite to each other. The first connector (2011) is a fluid input connector, the second connector (2012) is a fluid output connector, and the third connector (2013) and the fourth connector (2014) are respectively connected to the corresponding pipe sound-absorbing cover (202). The duct sound-absorbing cover (202) is located in the main direction of sound wave propagation. The duct sound-absorbing cover (202) includes an end plate and a cylinder, and the end plate and the cylinder enclose a cavity structure. Multiple conical elastic protrusions are densely arranged in the cavity structure and arranged on the end plate. The conical elastic protrusions are conical and contact the sound and sound wave energy entering the cavity structure with their conical surfaces. The bottom radius of the conical elastic protrusions is 5mm-50mm, the height of the conical elastic protrusions is 30mm-100mm, and the cone angle of the conical elastic protrusions is 5°-30°. The tip of the conical elastic protrusion is recessed into the inner cavity below the end face of the cylinder, and the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder is 5mm-30mm.

2. The soundproofing pipe for use in a vacuum chamber according to claim 1, characterized in that, At least one of the following locations is provided: between the fluid inlet connector (100) and the silencing unit (200), between the silencing unit (200) and the fluid outlet connector (300), at the inlet end of the fluid inlet connector (100), and at the outlet end of the fluid outlet connector (300); a double-sided connecting flange (400) is provided. The double-sided flange (400) has threaded blind holes (401) evenly distributed on both sides; or One side of the double-sided flange (400) is provided with a threaded blind hole (401), and the other side is provided with a threaded connection port (402); or The double-sided connecting flange (400) is provided with through holes (403), and each through hole (403) is used for connection on only one end while the other end is left unused.

3. The soundproofing pipe for use in a vacuum chamber according to claim 1 or 2, characterized in that, The third joint (2013) is equipped with a Venturi tube.

4. The soundproofing pipe for use in a vacuum chamber according to claim 1 or 2, characterized in that, The silencing unit (200) has multiple sets; The two adjacent groups of silencing units (200) are connected to the third connector (2013) of the second group of silencing units (200) through the first connector (2011) of the first group of silencing units (200).

5. The soundproofing pipe for use in a vacuum chamber according to claim 1 or 2, characterized in that, The silencing unit (200) has multiple sets; The two adjacent groups of silencers (200) are connected by a straight pipe (500).

6. The soundproofing pipe for use in a vacuum chamber according to claim 5, characterized in that, The straight pipe (500) uses a Venturi tube.

7. The soundproofing pipe for use in a vacuum chamber according to claim 1 or 2, characterized in that, The second connector (2012) is configured as a venturi tube.

8. A vacuum chamber, characterized in that, Includes the soundproofing pipe for use in a vacuum chamber as described in any one of claims 1 to 7.

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