Duct sound absorbing cover and duct system

Abstract

The present application relates to the technical field of vacuum soundproof device, and discloses a pipeline sound absorption cover and a pipeline system. The pipeline sound absorption cover comprises an end plate body and a cylinder body, the end plate body is connected with the cylinder body and encloses an inner cavity, and a plurality of conical elastic protrusions are densely arranged on the side of the end plate body facing the inner cavity. The whole structure is simple and low in cost, can effectively reduce or even prevent the transmission of sound wave energy in the fluid by being arranged at the end or corner of the pipeline system, thereby achieving the purpose of sound absorption and sound insulation, and can also reduce the instability and turbulent vibration of the fluid at the corner and has little influence on the flow of the main flow fluid.

Description

Technical Field

[0001] This invention relates to the field of vacuum silencing devices, and more particularly, to a pipe sound-absorbing cover. Furthermore, this invention also relates to a pipe system including the aforementioned pipe sound-absorbing cover. 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 a 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, and sound waves can propagate outside the vacuum chamber through this channel.

[0004] Conventional sound-absorbing cotton and cloth can control the propagation of sound waves from pipes to the outside, but they are ineffective against sound energy propagating inside fluids. 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 pipe sound-absorbing cover and pipe system that is simple and practical. By installing the pipe sound-absorbing cover at the end of the pipe or at a corner, it can absorb some of the sound energy propagating in the fluid inside the pipe, thereby achieving a better sound insulation effect. This solves the technical problem that existing vacuum box sound insulation cannot eliminate the sound energy propagating inside the fluid when exchanging fluid substances with the external environment through the pipe, resulting in poor sound insulation effect.

[0006] According to one aspect of the present invention, a pipe sound-absorbing cover is provided, comprising an end plate and a cylinder, the end plate being connected to the cylinder and enclosing an inner cavity, and a plurality of conical elastic protrusions being densely arranged on the side of the end plate facing the inner cavity.

[0007] Furthermore, the area of ​​the cone-shaped elastic protrusions on the end plate is greater than or equal to the cross-sectional area of ​​the inner cavity of the incoming flow pipe.

[0008] Furthermore, 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°.

[0009] Furthermore, the tip of the conical elastic protrusion is flush with the end face of the cylinder; or the tip of the conical elastic protrusion is lower than the end face of the cylinder and is sunk into the inner cavity, with the vertical distance between the tip of the conical elastic protrusion and the end face of the cylinder being 5mm-30mm.

[0010] Furthermore, a insertion hole is provided on the side of the end plate away from the inner cavity. The insertion hole and the cone elastic protrusion are arranged opposite to each other, so that the cone elastic protrusion has a hollow structure.

[0011] Furthermore, the duct sound-absorbing cover also includes an adjustment back plate, on which are arranged plug rods that match the plug holes. The elasticity and stiffness of the cone elastic protrusion are adjusted by the plug rods engaging with the plug holes.

[0012] Furthermore, the back plate and the end plate are coaxially arranged, and the back plate and the end plate are equipped with a spacing adjustment mechanism and a relative rotation adjustment mechanism.

[0013] Furthermore, the spacing adjustment mechanism includes a central shaft rod arranged on the central axis of the end plate body and capable of circumferential rotation, a positioning nut threadedly connected to the central shaft rod, and a locking nut threadedly connected to the central shaft rod; the center of the adjustment back plate has a through hole for the central shaft rod to pass through.

[0014] Furthermore, the relative rotation adjustment mechanism includes an arc-shaped hole on the adjustment back plate, a fixing rod arranged on the end plate body, and a fixing nut threaded onto the fixing rod for locking the fixing rod onto the adjustment back plate.

[0015] According to another aspect of the invention, a piping system is also provided, which includes the aforementioned pipe sound-absorbing cover.

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

[0017] The present invention relates to a pipe sound-absorbing cover, which is installed at the end of a pipe or at a corner, forming a dead water zone at the edge of the main channel. The pipe sound-absorbing cover is located in the main direction of sound wave propagation. It 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 their conical surfaces contact the sound and sound wave energy entering the cavity structure. 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 in cost. By being placed at the end or corner of the pipeline system, it can effectively reduce or even prevent the transmission of sound wave energy in the fluid, thereby achieving the purpose of noise reduction and sound insulation. At the same time, it can also reduce the instability and turbulence of the fluid at the corner, and has little impact on the flow of the main fluid.

[0018] In particular, when the pipe sound-absorbing cover of this invention is applied to the pipe system inside a vacuum chamber, in the pipe system where the equipment inside the vacuum chamber is connected to the outside world, since the external environment of the pipe is a vacuum, sound waves can only propagate through the pipe wall and fluid. By using the pipe sound-absorbing cover of this invention to absorb part of the fluid propagation, a very good overall sound insulation effect can be achieved.

[0019] 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

[0020] 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:

[0021] Figure 1 This is one of the structural schematic diagrams of a preferred embodiment of the pipe sound-absorbing cover of the present invention;

[0022] Figure 2 This is a second schematic diagram of the structure of the pipe sound-absorbing cover of the preferred embodiment of the present invention;

[0023] Figure 3 This is the third schematic diagram of the structure of the pipe sound-absorbing cover of the preferred embodiment of the present invention;

[0024] Figure 4 This is one of the schematic diagrams of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention;

[0025] Figure 5 This is one of the cross-sectional structural schematic diagrams of the end plate body and the adjustment back plate in a preferred embodiment of the present invention;

[0026] Figure 6 This is a second schematic diagram of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention;

[0027] Figure 7 This is a second cross-sectional structural schematic diagram of the end plate body and the adjustment back plate of a preferred embodiment of the present invention;

[0028] Figure 8 This is the third schematic diagram of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention;

[0029] Figure 9 yes Figure 8 AA section view;

[0030] Figure 10 yes Figure 8 BB cross-sectional view.

[0031] Legend:

[0032] 100. End plate; 200. Cylinder; 300. Conical elastic protrusion; 400. Insertion hole; 500. Adjusting back plate; 501. Insertion rod; 600. Spacing adjustment mechanism; 601. Central shaft rotating rod; 602. Positioning nut; 603. Locking nut; 604. Through hole; 700. Relative rotation adjustment mechanism; 701. Arc-shaped hole; 702. Fixing rod; 703. Fixing nut. Detailed Implementation

[0033] 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.

[0034] Figure 1 This is one of the structural schematic diagrams of a preferred embodiment of the pipe sound-absorbing cover of the present invention; Figure 2 This is a second schematic diagram of the structure of the pipe sound-absorbing cover of the preferred embodiment of the present invention; Figure 3 This is the third schematic diagram of the structure of the pipe sound-absorbing cover of the preferred embodiment of the present invention; Figure 4 This is one of the schematic diagrams of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention; Figure 5 This is one of the cross-sectional structural schematic diagrams of the end plate body and the adjustment back plate in a preferred embodiment of the present invention; Figure 6 This is a second schematic diagram of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention; Figure 7 This is a second cross-sectional structural schematic diagram of the end plate body and the adjustment back plate of a preferred embodiment of the present invention; Figure 8 This is the third schematic diagram of the assembly structure of the end plate and the adjustment back plate in a preferred embodiment of the present invention; Figure 9 yes Figure 8 AA section view; Figure 10 yes Figure 8 BB cross-sectional view.

[0035] like Figure 1 , Figure 2 and Figure 3As shown, the pipe sound-absorbing cover of this embodiment includes an end plate 100 and a cylindrical body 200. The end plate 100 and the cylindrical body 200 are connected and enclosed to form an inner cavity. Multiple conical elastic protrusions 300 are densely arranged on the side of the end plate 100 facing the inner cavity. The pipe sound-absorbing cover of this invention is installed at the end of the pipe or at a corner, forming a dead water zone at the edge of the main channel. The pipe sound-absorbing cover is located in the main direction of sound wave propagation. It includes an end plate 100 and a cylindrical body 200, and the end plate 100 and the cylindrical body 200 enclose to form a cavity structure. Multiple conical elastic protrusions 300 are densely arranged in the cavity structure and on the end plate 100. The conical elastic protrusions 300 are conical and their conical surfaces contact the sound and sound wave energy entering the cavity structure. When the fluid in the pipe flows to the end or corner of the pipe, the fluid impacts and enters the cavity structure, and comes into contact with the densely arranged conical elastic protrusions 300, the inner wall of the end plate 100 and the inner wall of the cylinder 200. On the one hand, the incoming sound waves are frequently reflected, and the multi-level and multiple reflection effect of the densely arranged conical surfaces is better, so that the sound wave energy is retained in the cavity structure and then absorbed by the conical elastic protrusions 300 and the fluid vibration, so that the sound wave energy cannot be transmitted back to the main channel. The existence of the dead water zone formed by the pipe sound-absorbing cover has very little resistance to the main channel, but can continuously consume the sound energy in the fluid, achieve the purpose of sound absorption, and thus obtain a better sound insulation effect. On the other hand, the use of elastic conical protrusions 300 can suppress the instability and turbulence of fluid entering the stagnant water zone to a certain extent. More specifically, the elasticity of the densely arranged conical protrusions 300 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 the pipeline system, it can effectively reduce or even prevent the transmission of sound wave energy in the fluid, thereby achieving the purpose of noise reduction and sound insulation. At the same time, it can also reduce the instability and turbulence of the fluid at the corner, with minimal impact on the flow of the main channel fluid. In particular, when the pipe sound-absorbing cover of this invention is applied to the pipeline system inside a vacuum chamber, in the pipeline system where the equipment inside the vacuum chamber is connected to the outside world, since the external environment of the pipeline is a vacuum, sound waves can only propagate through the pipe wall and the fluid. By using the pipe sound-absorbing cover of this invention to absorb part of the fluid propagation, a very good overall sound insulation effect can be achieved. Optionally, the conical elastic protrusion 300 adopts a conical or pyramidal structure. By changing the conical shape, density, length, taper, and other parameters of the conical elastic protrusion 300, it can adapt to sound wave silencing and sound insulation in different sound wave frequency ranges. Optionally, the pipe sound-absorbing cover is made of rubber or plastic and is integrally molded using processes such as injection molding, compression molding, or pressure injection.Optionally, to facilitate connection with the piping system, the outer wall of the pipe sound-absorbing cover cylinder 200 can be provided with external threads; or the end plate 100 of the pipe sound-absorbing cover can be provided with a connecting flange; or connecting holes, connecting clips, etc. can be provided on the end plate 100 of the pipe sound-absorbing cover. Optionally, to facilitate maintenance and replacement, for small pipe sound-absorbing covers, raised and recessed patterns can be provided on the outer periphery of the end plate 100, such as... Figure 1 As shown. Optionally, for medium and large-sized pipe sound-absorbing covers, the end plate 100 is designed as a circular or polygonal flange, such as... Figure 2 and Figure 3 As shown. Optionally, conical elastic protrusions 300 can also be arranged on the inner wall surface of the cylinder 200. Multiple conical elastic protrusions 300 are densely arranged on the end plate 100, specifically meaning that: the gap between two adjacent conical elastic protrusions 300 is very small, for example, less than 1 / 2 to 1 / 10 of the radius of the bottom surface of the conical elastic protrusion 300; or two adjacent conical elastic protrusions 300 are arranged close together; or two adjacent conical elastic protrusions 300 are partially overlapped.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, the area of ​​the cone-shaped elastic protrusions 300 arranged on the end plate 100 is greater than or equal to the cross-sectional area of ​​the inner cavity of the incoming flow pipe. This allows sound waves from the main pipe to directly enter the area of ​​the cone-shaped elastic protrusions 300. Since the cone-shaped elastic protrusions 300 are all inclined to meet the sound waves, the sound waves are frequently reflected by the cone-shaped elastic protrusions 300, causing the sound wave energy to be retained in the cavity structure and absorbed by the cone-shaped elastic protrusions 300 and fluid vibration. This means that a large portion of the sound wave energy is unlikely to return to the main flow channel.

[0037] like Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the bottom radius of the conical elastic protrusion 300 is 5mm-50mm, the height of the conical elastic protrusion 300 is 30mm-100mm, and the cone angle of the conical elastic protrusion 300 is 5°-30°. Based on the axial and radial dimensions of the cylinder 200 and the frequency range of sound waves within the pipe, the bottom radius, height, and cone angle of the conical elastic protrusion 300 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 300 are densely arranged, and the cone angle of the cone-shaped elastic protrusions 300 is 5°-30°, which makes the contact surface between the cone-shaped elastic protrusions 300 and the sound very small. By reducing the contact surface between the sound and the cone-shaped elastic protrusions 300, a certain sound absorption 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 300 form a multi-faceted and comprehensive reflection, absorption and weakening of the sound, thereby achieving the effect of sound insulation and sound absorption. When the cone angle of the cone elastic protrusion 300 is too small, less than 5°, the manufacturing cost and manufacturing difficulty will increase, and the cone elastic protrusion 300 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 300 is too large, greater than 30°, the contact area between the cone surface of the cone elastic protrusion 300 and the sound and sound waves will increase. However, due to the size limitation of the end plate 100 as a carrier, the number of cone elastic protrusions 300 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.

[0038] like Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the tip of the conical elastic protrusion 300 is flush with the end face of the cylinder 200. Optionally, the tip of the conical elastic protrusion 300 is recessed into the inner cavity below the end face of the cylinder 200, and the vertical distance between the tip of the conical elastic protrusion 300 and the end face of the cylinder 200 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 effects through the frequent reflection, absorption, and attenuation of the densely arranged conical elastic protrusions 300; at the same time, after the fluid enters the stagnant water zone, there is a buffer distance at one end before it comes into contact with the densely arranged conical elastic protrusions 300. It 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 300 and the end face of the cylinder 200 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 300 and the end face of the cylinder 200 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 300, thereby reducing the effect of noise reduction and sound insulation.

[0039] like Figure 4 and Figure 5 As shown, in this embodiment, a insertion hole 400 is provided on the side of the end plate 100 facing away from the inner cavity. The insertion hole 400 and the conical elastic protrusion 300 are arranged opposite each other, so that the conical elastic protrusion 300 has a hollow structure. The hollow structure of the conical elastic protrusion 300, 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 energy of the sound, 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 of the tip of the conical elastic protrusion 300 to the end face of the cylinder 200 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.

[0040] like Figure 4 and Figure 5As shown, in this embodiment, the pipe sound-absorbing cover also includes an adjusting back plate 500. The adjusting back plate 500 is provided with insertion rods 501 that match the insertion holes 400. The elasticity and stiffness of the conical elastic protrusion 300 are adjusted by inserting the insertion rods 501 into the insertion holes 400. The conical elastic protrusion 300 has a hollow structure, which also has drawbacks and limitations. In response to different channel environments, fluid flow rates, fluid speeds, and sound frequencies, it is necessary to appropriately adjust the elasticity and stiffness of the conical elastic protrusion 300, and even adjust the elasticity and stiffness in a certain direction. By adding the adjusting back plate 500, and using the insertion rods 501 of the adjusting back plate 500 to insert into the insertion holes 400, a composite state of the conical elastic protrusion 300 is formed, thereby adjusting the elasticity and stiffness of the conical elastic protrusion 300 to meet the needs of sound absorption and sound insulation, achieving the optimal sound absorption 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).

[0041] like Figure 4 and Figure 5As shown, in this embodiment, the back plate 500 and the end plate 100 are coaxially arranged, and the back plate 500 and the end plate 100 are equipped with a spacing adjustment mechanism 600 and a relative rotation adjustment mechanism 700. The spacing adjustment mechanism 600 controls the spacing between the back plate 500 and the end plate 100, specifically controlling the combined strength of the insertion fit between the insertion rod 501 and the insertion hole 400, thereby adjusting the elasticity and stiffness of the conical elastic protrusion 300. The relative rotation adjustment mechanism 700 adjusts the relative rotation between the back plate 500 and the end plate 100, thereby causing the insertion rod 501 to fit against the insertion hole 400 circumferentially, thus changing the combined strength in a certain direction. Different adjustment sequences of the spacing adjustment mechanism 600 and the relative rotation adjustment mechanism 700 result in different combined structures, adapting to different channel environments, fluid flow rates, fluid speeds, sound frequencies, etc., to achieve optimal sound absorption and insulation effects. Furthermore, the conical elastic protrusion 300 employs an elastomer structure. Therefore, as the insertion depth of the insertion rod 501 of the adjusting back plate 500 increases, the strength of the bonded composite increases until the adjusting back plate 500 and the end plate 100 are completely bonded. Similarly, because the conical elastic protrusion 300 employs an elastomer structure, axial and / or circumferential rotation is used to form elastic compression in different directions, thereby increasing the composite strength in different directions. This adjustment can also be adjusted according to changes in the environment. It is suitable for use in low-frequency acoustic vibration environments. Optionally, the spacing adjustment mechanism 600 can be automatically adjusted using cylinders, hydraulic cylinders, motors, etc. Optionally, the relative rotation adjustment mechanism 700 can be automatically adjusted using servo motors, rotary motors, etc.

[0042] like Figure 4 and Figure 5As shown, in this embodiment, the spacing adjustment mechanism 600 includes a central shaft rod 601 arranged on the central shaft of the end plate 100 and rotatable circumferentially, a positioning nut 602 threadedly connected to the central shaft rod 601, and a locking nut 603 threadedly connected to the central shaft rod 601; the center of the adjustment back plate 500 has a through hole 604 for the central shaft rod 601 to pass through. First, the axial position is positioned using the positioning nut 602, and fine-tuning and precise adjustment can be achieved by rotating the rod a few times. The adjustment back plate 500 is slidably inserted on the central shaft rod 601 through the through hole 604 and abuts against the positioning nut 602. Then, the locking nut 603 is used to lock and fix it, thereby completing the adjustment of the axial spacing between the adjustment back plate 500 and the end plate 100; and the adjusted adjustment back plate 500 rotates circumferentially with the central shaft rod 601. The central shaft rotating rod 601 is embedded into the end plate 100 via a rotating slider at its end, thereby achieving axial limitation between the central shaft rotating rod 601 and the end plate 100. Simultaneously, the central shaft rotating rod 601 can still rotate circumferentially within the end plate 100, facilitating circumferential rotation adjustment and circumferential locking relative to the rotation adjustment mechanism 700. Optionally, the positioning nut 602 and / or locking nut 603 are anti-reverse nuts. Optionally, the positioning nut 602 and / or locking nut 603 are used in conjunction with an anti-reverse spring.

[0043] like Figure 4 and Figure 5 As shown, in this embodiment, the relative rotation adjustment mechanism 700 includes an arc-shaped hole 701 opened on the adjustment back plate 500, a fixing rod 702 arranged on the end plate 100, and a fixing nut 703 threadedly connected to the fixing rod 702 for locking the fixing rod 702 onto the adjustment back plate 500. The fixing rod 702 of the end plate 100 passes through the arc-shaped hole 701 and can rotate circumferentially within the arc-shaped hole 701. After circumferential rotation adjustment, it is fixed and locked by the fixing nut 703; more specifically, it is fixed by the fixing nut 703 and cooperates with the spacing adjustment mechanism 600 to achieve fixed locking. Optionally, multiple sets of relative rotation adjustment mechanisms 700 are arranged, and the multiple sets of relative rotation adjustment mechanisms 700 are evenly spaced along the circumference of the adjustment back plate 500 to achieve stable locking and maintain the structural stability after locking. Optionally, the fixing nut 703 may also include two nuts, located at opposite ends of the arc-shaped hole 701, one nut for positioning and the other for locking. Optionally, the fixing nut 703 is a check nut. Optionally, the fixing nut 703 is used in conjunction with a check spring.

[0044] like Figure 6 and Figure 7As shown, in this embodiment, a structure combining a spacing adjustment mechanism 600 and a relative rotation adjustment mechanism 700 is adopted. Specifically, the spacing adjustment mechanism 600 includes an axial positioning threaded hole and an axial positioning bolt formed on the adjustment back plate 500; the two axial positioning threaded holes are arranged radially opposite to each other on the adjustment back plate 500, and the axial positioning bolt is threaded into the axial positioning threaded hole and abuts against the surface of the end plate 100, thereby realizing the axial spacing limit between the adjustment back plate 500 and the end plate 100. The axial spacing between the adjustment back plate 500 and the end plate 100 is controlled by adjusting the axial extension of the axial positioning bolt toward the end plate 100. The relative rotation adjustment mechanism 700 includes a conical screw threaded onto the end plate 100 and an eccentric conical hole on the adjustment back plate 500, eccentrically positioned relative to the central axis of the conical screw. The conical screw is screwed into the end plate 100, forcing a conical surface engagement between the screw and the eccentric conical hole, thereby rotating the adjustment back plate 500 and causing the insertion rod 501 to radially abut against the insertion hole 400. Through the coordinated action of the spacing adjustment mechanism 600 and the relative rotation adjustment mechanism 700, the relative position of the adjustment back plate 500 and the end plate 100 is adjusted and fixed, thus achieving a combined adjustment of the insertion rod 501 and the insertion hole 400. Optionally, multiple sets of axial positioning threaded holes and eccentric conical holes are evenly distributed on the adjustment back plate 500. Different combined methods of the insertion rod 501 and the insertion hole 400 are achieved through the connection and engagement of axial positioning bolts in different axial positioning threaded holes and the conical surface engagement of the conical screws in different eccentric conical holes. Suitable for use in low to medium frequency sound wave environments.

[0045] like Figure 8 , Figure 9 and Figure 10 As shown, the adjusting back plate 500 and the end plate 100 are coaxially arranged. The insertion holes 400 on the end plate 100 are cylindrical holes, and correspondingly, the insertion rods 501 on the adjusting back plate 500 are cylindrical rods. The cylindrical rods have through holes along their central axis for venting when the insertion rods 501 are inserted into the insertion holes 400, preventing the formation of internal high pressure after insertion. A base plate is also provided on the side of the adjusting back plate 500 away from the end plate 100. By adding shims and controlling the thickness of the shims between the adjusting back plate 500 and the end plate 100, the insertion depth of the insertion rods 501 into the insertion holes 400 is controlled. Finally, the base plate, adjusting back plate 500, base plate, and end plate 100 are locked together as a single structure using locking bolts. The base plate is used to control the venting and sealing of the insertion rods 501. This design is suitable for use in medium-to-high frequency acoustic environments, and even ultrasonic environments.

[0046] The piping system of this embodiment includes the aforementioned pipe sound-absorbing cover.

[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 pipe sound-absorbing cover, comprising an end plate (100) and a cylindrical body (200). The end plate (100) is connected to the cylinder (200) and encloses it to form an inner cavity. Its features are, Multiple conical elastic protrusions (300) are densely arranged on the side of the end plate (100) facing the inner cavity. The pipe sound-absorbing cover is installed at the end of the pipe or at the corner, forming a dead water zone at the edge of the main channel. The pipe sound-absorbing cover is located in the main direction of sound wave propagation, and the cone elastic protrusion (300) is cone-shaped and contacts the sound and sound wave energy entering the cavity structure with the cone surface. The tip of the conical elastic protrusion (300) is lower than the end face of the cylinder (200) and is sunk in the inner cavity. The vertical distance between the tip of the conical elastic protrusion (300) and the end face of the cylinder (200) is 5mm-30mm, so that the sound enters the dead water zone formed by the inner cavity, and then through the frequent reflection, absorption and weakening effect of the densely arranged conical elastic protrusions (300), the fluid enters the dead water zone and has a buffer distance before contacting the densely arranged conical elastic protrusions (300), which can reduce the probability of fluid instability and turbulence. An insertion hole (400) is provided on the side of the end plate (100) away from the inner cavity. The insertion hole (400) and the conical elastic protrusion (300) are arranged opposite to each other so that the conical elastic protrusion (300) has a hollow structure. The conical elastic protrusion (300) has a hollow structure. Combined with its own elasticity, it will generate disordered vibration, which will interfere with the propagation of sound and thus prevent the transmission of sound. The duct sound-absorbing cover also includes an adjusting back plate (500). The adjusting back plate (500) is provided with a plug rod (501) that matches the plug hole (400). The elasticity and stiffness of the cone elastic protrusion (300) are adjusted by the plug rod (501) and the plug hole (400) to meet the needs of sound absorption and sound insulation, so that the sound absorption and sound insulation effect reaches the best state.

2. The pipe sound-absorbing cover according to claim 1, characterized in that, The area of ​​the cone-shaped elastic protrusions (300) on the end plate body (100) is greater than or equal to the cross-sectional area of ​​the inner cavity of the incoming flow pipe.

3. The pipe sound-absorbing cover according to claim 1, characterized in that, The bottom radius of the conical elastic bump (300) is 5mm-50mm, and the height of the conical elastic bump (300) is 30mm-100mm; The cone angle of the cone elastic bump (300) is 5°-30°.

4. The pipe sound-absorbing cover according to claim 1, characterized in that, The spacing adjustment mechanism (600) includes a central shaft rod (601) that is arranged on the central shaft of the end plate body (100) and can rotate in the circumferential direction, a positioning nut (602) that is threaded on the central shaft rod (601), and a locking nut (603) that is threaded on the central shaft rod (601). The center of the adjusting back plate (500) has a through hole (604) for the central shaft rotating rod (601) to pass through.

5. The pipe sound-absorbing cover according to claim 1, characterized in that, The relative rotation adjustment mechanism (700) includes an arc-shaped hole (701) opened on the adjustment back plate (500), a fixing rod (702) arranged on the end plate body (100), and a fixing nut (703) threaded on the fixing rod (702) for locking the fixing rod (702) on the adjustment back plate (500).

6. A piping system, characterized in that, The pipe sound-absorbing cover includes any one of claims 1 to 5.

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