Silencing and noise reduction air passing net without reducing flow rate

Abstract

The application relates to the technical field of sound-absorbing and noise-reducing air passing nets, and provides a sound-absorbing and noise-reducing air passing net which does not reduce the flow speed and comprises a main body assembly, a sound-absorbing assembly and a guiding assembly arranged in the main body assembly, a connecting assembly connected to the outside of the sound-absorbing assembly, and an adjusting assembly connected with the sound-absorbing assembly and extending to the outside of the main body assembly, wherein the guiding assembly is located at one side of the sound-absorbing assembly, and the adjusting assembly is located at the middle of the sound-absorbing assembly. The device solves the problems that the Tesla valve in the airflow accelerating cylinder cannot reach a relatively high flow speed and has resistance, the various components of the sound-absorbing assembly are combined to form a Laval nozzle, the high-pressure air in the contraction pipe on the air inlet side forms a relatively high-density air wall while the Laval nozzle effect realizes that the airflow speed is not reduced, the relatively high density forms a sparse and dense threshold, sound waves in the sparse and dense threshold are blocked, sound waves outside the threshold are weakened, and thus the noise reduction function is realized.

Description

Technical Field

[0001] This invention relates to the field of noise reduction and airflow reduction mesh technology, and more specifically, to a noise reduction and airflow reduction mesh that does not reduce airflow velocity. Background Technology

[0002] Noise reduction refers to reducing noise by eliminating the source of the sound or preventing its propagation.

[0003] Currently, existing noise reduction methods involve slowing down the airflow and absorbing some noise through the intake silencer. By using pre- and post-silencers, most of the wind noise generated by the fresh air system is absorbed. Finally, a Tesla valve inside the airflow accelerator is used to accelerate the noise-reduced airflow, so that the silencer reduces noise without reducing the airflow velocity. However, the Tesla valve has the characteristic of high resistance in one direction and low resistance in another, but there is resistance in both directions. Therefore, accelerating the airflow through the Tesla valve inside the airflow accelerator not only involves resistance but also fails to achieve a fast enough flow velocity, greatly reducing the functionality of the airflow mesh. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a noise reduction and soundproofing airflow mesh that does not reduce the flow rate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a noise reduction and silencing air duct that does not reduce flow velocity, comprising a main body component, a noise reduction component and a guide component disposed inside the main body component, a connecting component connected to the outside of the noise reduction component, and an adjustment component connected to the noise reduction component and extending to the outside of the main body component, wherein the guide component is located on one side of the noise reduction component, and the adjustment component is located in the middle of the noise reduction component.

[0006] The main component includes a mesh cylinder, and the silencing component, adjusting component, connecting component, and guiding component are all located inside the mesh cylinder.

[0007] The noise reduction assembly includes a shrink tube and an expansion tube, both of which are disposed inside the mesh cylinder and are coaxially arranged with the shrink tube, the expansion tube, and the mesh cylinder. The end of the shrink tube near the expansion tube is connected to a first connecting tube, and the end of the expansion tube near the shrink tube is connected to a second connecting tube. The inner diameter of the first connecting tube is the same as the outer diameter of the second connecting tube. The first connecting tube and the second connecting tube are interlocked. The end of the shrink tube away from the expansion tube is connected to the inner wall of the mesh cylinder.

[0008] The present invention is further configured such that: the main component also includes an air inlet mesh and an air outlet mesh, the air inlet mesh and the air outlet mesh are respectively installed at both ends of the mesh cylinder, and the end of the contraction tube away from the expansion tube is in contact with the air inlet mesh.

[0009] By adopting the technical scheme, external air enters the net cylinder through the air inlet net, and the air successively passes through the air inlet net, the contraction pipe, the first connecting pipe, the second connecting pipe, the expansion pipe and the air outlet net, and then is discharged. The contraction pipe, the expansion pipe, the first connecting pipe and the second connecting pipe cooperatively form a Laval nozzle, that is, when the air flows in the nozzle, the principle that the flow velocity is large at a small cross section and the flow velocity is small at a large cross section is followed, so that the air is continuously accelerated in the first connecting pipe and the second connecting pipe until supersonic speed. The flow principle of supersonic air is opposite to the principle that the flow velocity is large at a small cross section and the flow velocity is small at a large cross section, so that the air flow continues to accelerate, thereby achieving the purpose of not reducing the flow velocity of the air flow. While ensuring that the flow velocity of the air flow is not reduced, the high-pressure air of the contraction pipe at the air inlet side forms a relatively high-density air wall, and the relatively high density forms a sparse and dense threshold, so that the sound waves within the sparse and dense threshold are blocked, and the sound waves outside the threshold are weakened, thereby realizing the noise reduction function.

[0010] The adjusting assembly further comprises a first driven gear and a second driven gear sleeved on the outer sidewalls of the first connecting pipe and the second connecting pipe, a driving gear engaged with the first driven gear and the second driven gear, a sleeve connected to the top of the driving gear, and a connecting rod inserted into the sleeve.

[0011] The end of the sleeve away from the driving gear is arranged in the inner wall of the net cylinder and is rotationally connected with the net cylinder.

[0012] The inner wall of the sleeve is symmetrically connected with two limiting blocks, the outer sidewall of the connecting rod is symmetrically provided with two limiting grooves, the two limiting blocks are correspondingly arranged with the two limiting grooves, and the limiting blocks are slidingly connected in the corresponding limiting grooves.

[0013] The inner walls of the contraction pipe and the expansion pipe are both connected with flow guide strips, and the spiral directions of the two groups of flow guide strips are opposite.

[0014] The connecting assembly comprises a first connecting plate and a second connecting plate sleeved on the outer sidewall of the second connecting pipe. One end of the second connecting plate is inserted between the second driven gear and the second connecting pipe. The second connecting plate is connected with the second driven gear. The end of the first connecting plate close to the second connecting plate is uniformly provided with a micro push rod. One end of the second connecting plate is uniformly provided with a positioning hole. The micro push rod and the positioning hole are correspondingly arranged. The piston rod of the micro push rod extends into the corresponding positioning hole.

[0015] By adopting the technical scheme, in the process of conveying air, if the air flow rate flowing into the contraction pipe is low, to avoid the air flowing into the first connecting pipe from reaching a high flow rate, the staff connects the external driving device with the connecting rod, the external driving device drives the connecting rod, the sleeve and the driving gear to rotate, the first driven gear and the second driven gear rotate synchronously, the rotation directions of the first driven gear and the second driven gear are opposite, at this time, the first connecting plate and the second connecting plate are kept in a separated state, the first driven gear drives the first connecting pipe and the contraction pipe to rotate, the guide strips in the contraction pipe rotate synchronously, the air forms a rotational flow, and the air flow rate flowing into the first connecting pipe is ensured.

[0016] If the air flow rate flowing into the contraction pipe is high, to avoid the overwind net from being unable to withstand the high-speed flowing air, the first driven gear and the second driven gear rotate synchronously and in opposite directions, at this time, the piston rod of the micro push rod extends into the positioning hole, thereby connecting the first connecting plate and the second connecting plate, the first driven gear and the second driven gear drive the contraction pipe and the expansion pipe to rotate in opposite directions respectively, the guide strips in the contraction pipe collide with the air and push the air to form a reverse resistance, thereby reducing the air flow rate, and then the guide strips in the first connecting pipe, the second connecting pipe and the expansion pipe increase the air flow rate and form a rotational flow, thereby ensuring the air flow rate, and the above two adjustment modes can be switched according to the situation in the air conveying process, without affecting the conveying of the air.

[0017] The application is further provided that the guide assembly comprises a ring body rotationally connected to the inner wall of the net cylinder, a gap is arranged between one end of the ring body and one end of the expansion pipe, a gap is also arranged between the expansion pipe and the inner wall of the net cylinder, and the two gaps are communicated.

[0018] The application is further provided that a support is mounted to the inner wall of the ring body, a guide block is mounted to one side of the support, the guide block is arranged in a conical shape, and the guide block is coaxially arranged with the expansion pipe and the net cylinder.

[0019] The application is further provided that the expansion pipe is uniformly connected with a plug rod at the end away from the contraction pipe, a through hole corresponding to the plug rod is uniformly arranged at one end of the ring body, and one end of the plug rod is inserted into the corresponding through hole.

[0020] By adopting the technical scheme, when the air flows through the sound attenuation assembly, the air flows out from the opening of the expansion pipe, then flows to the conical part of the guide block, then disperses along the conical surface, part of the air continues to flow to the direction of the air outlet net along the inner wall of the net cylinder, and the other part of the air is intercepted by the ring body and flows reversely into the gap, and then flows out through the hole outside the net cylinder, which can avoid the damage of the air outlet net caused by the direct contact of the high-speed flowing air with the air outlet net.

[0021] To sum up, the present application includes at least one of the following beneficial technical effects:

[0022] (1) By setting the sound-absorbing assembly, the sound-absorbing assembly is combined with each component to form a Laval nozzle, and the Laval nozzle effect realizes that the air flow rate is not reduced, at the same time, the high-pressure air of the contraction pipe on the air inlet side forms a relatively high-density air wall, the relatively high density forms a sparse and dense threshold, so that the sound waves within the sparse and dense threshold are blocked, and the sound waves outside the threshold are weakened, thereby realizing the noise reduction function.

[0023] (2) By setting the adjusting assembly, if the air flow rate discharged into the inside of the contraction pipe is low, to avoid the air entering the inside of the first connecting pipe from being unable to reach a fast flow rate, the external driving device drives the connecting rod, the sleeve and the driving gear to rotate, causing the first driven gear to drive the first connecting pipe and the contraction pipe to rotate, and the guide strip in the contraction pipe rotates synchronously, so that the air forms a rotational flow, reduces air resistance, and maintains and accelerates the air flow rate entering the inside of the first connecting pipe.

[0024] (3) By setting the connecting assembly, if the air flow rate discharged into the inside of the contraction pipe is high, to avoid that the whole overwind net cannot withstand the high-speed flowing air, the micro push rod connects the first connecting plate and the second connecting plate, the first driven gear and the second driven gear drive the contraction pipe and the expansion pipe to rotate in opposite directions respectively, the guide strip in the contraction pipe collides with the air and pushes the air to form a reverse resistance, thereby reducing the air flow rate, and then the guide strips in the first connecting pipe, the second connecting pipe and the expansion pipe increase the air flow rate, the connecting assembly can adjust the rotating directions of the contraction pipe and the expansion pipe according to the initial air flow rate, thereby improving the functionality of the overwind net. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the overall structure diagram of the sound-absorbing and noise-reducing overwind net without reducing the flow rate.

[0026] Figure 2 It is the right view structure diagram of the present application.

[0027] Figure 3 It is Figure 2 It is the sectional view along the B-B direction.

[0028] Figure 4 It is Figure 3 It is the three-dimensional structure diagram of

[0029] Figure 5 It is the connecting structure diagram of the sound-absorbing assembly and the adjusting assembly of the present application.

[0030] Figure 6 It is the structure diagram of the sound-absorbing assembly of the present application.

[0031] Figure 7The schematic view of the connecting structure of the adjusting assembly and the connecting assembly of the application.

[0032] Figure 8 is Figure 1 The sectional view along the A-A direction.

[0033] Explanation of reference numerals: 1, main body assembly; 11, mesh tube; 12, air inlet mesh; 13, air outlet mesh; 2, sound reduction assembly; 21, contraction pipe; 22, expansion pipe; 23, first connecting pipe; 24, second connecting pipe; 3, adjusting assembly; 31, sleeve pipe; 32, connecting rod; 33, driving gear; 34, first driven gear; 35, second driven gear; 36, flow guide strip; 37, limiting block; 38, limiting groove; 4, connecting assembly; 41, first connecting plate; 42, second connecting plate; 43, micro push rod; 44, positioning hole; 5, guiding assembly; 51, ring body; 52, support; 53, guiding block; 54, insertion rod. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0036] Please refer to Figures 1-8 The present application provides the following technical solutions:

[0037] Embodiment one

[0038] Please refer to Figures 1-3 The sound reduction and noise reduction air passing mesh does not reduce the flow rate, comprising a main body assembly 1, a sound reduction assembly 2 and a guiding assembly 5 arranged inside the main body assembly 1, a connecting assembly 4 connected to the outside of the sound reduction assembly 2, and an adjusting assembly 3 connected to the sound reduction assembly 2 and extending to the outside of the main body assembly 1. The guiding assembly 5 is located on one side of the sound reduction assembly 2, the adjusting assembly 3 is located in the middle of the sound reduction assembly 2, the main body assembly 1 is used to carry each assembly, and the main body assembly 1 and the sound reduction assembly 2 cooperate to transport air. During the transportation process, the sound reduction assembly 2 reduces the noise of the transported air, the adjusting assembly 3 and the connecting assembly 4 are used to adjust the state of the sound reduction assembly 2, so that the sound reduction assembly 2 can adjust the air flow rate according to the initial air flow rate, avoiding the case that the initial air flow rate is insufficient or too fast to cause damage to the sound reduction assembly 2 and the air passing mesh, and the guiding assembly 5 is used to disperse and guide the transported air.

[0039] Please refer to Figure 1 and Figure 2The main body assembly 1 comprises a mesh cylinder 11, an air inlet mesh 12 and an air outlet mesh 13, the sound elimination assembly 2, the adjusting assembly 3, the connecting assembly 4 and the guiding assembly 5 are located inside the mesh cylinder 11, the mesh cylinder 11 is used for bearing the assemblies, the air inlet mesh 12 and the air outlet mesh 13 are installed at two ends of the mesh cylinder 11 respectively, air passes through the air inlet mesh 12, the mesh cylinder 11 and the air outlet mesh 13 in sequence, and the air inlet mesh 12 and the air outlet mesh 13 shield the two ends of the mesh cylinder 11 respectively and filter air.

[0040] Referring to Figures 3-6 The sound elimination assembly 2 comprises a convergent pipe 21 and a divergent pipe 22, the convergent pipe 21 and the divergent pipe 22 are arranged inside the mesh cylinder 11, and the convergent pipe 21, the divergent pipe 22 and the mesh cylinder 11 are coaxially arranged, a first connecting pipe 23 is communicated with one end of the convergent pipe 21 close to the divergent pipe 22, a second connecting pipe 24 is communicated with one end of the divergent pipe 22 close to the convergent pipe 21, the inner diameter of the first connecting pipe 23 is consistent with the outer diameter of the second connecting pipe 24, the first connecting pipe 23 and the second connecting pipe 24 are arranged in a plug-in mode, the convergent pipe 21, the divergent pipe 22, the first connecting pipe 23 and the second connecting pipe 24 cooperate to form a Laval nozzle, one end of the convergent pipe 21 away from the divergent pipe 22 is connected with the inner wall of the mesh cylinder 11, and the one end of the convergent pipe 21 away from the divergent pipe 22 is attached to the air inlet mesh 12, when air enters the inside of the mesh cylinder 11, the air directly flows into the nozzle through the air inlet mesh 12, the high-pressure air of the convergent pipe 21 on the air inlet side forms a relatively high-density air wall, the relatively high density forms a sparse and dense threshold, the sound waves within the sparse and dense threshold are blocked, the sound waves outside the threshold are weakened, thereby realizing the noise reduction function, and the air continuously increases the flow rate according to the principle of the Laval nozzle, thereby achieving the purpose of not reducing the wind speed.

[0041] Specifically, the staff connects the external air supply pipe with the mesh cylinder 11, so that the air passes through the air inlet mesh 12, the convergent pipe 21, the first connecting pipe 23, the second connecting pipe 24, the divergent pipe 22 and the air outlet mesh 13 in sequence and then is discharged, before the air enters the inside of the mesh cylinder 11, the air inlet mesh 12 first filters the air, the convergent pipe 21, the divergent pipe 22, the first connecting pipe 23 and the second connecting pipe 24 cooperate to form a Laval nozzle, when the air flows in the nozzle, the principle of the Laval nozzle is that the flow rate is large at the small cross section and the flow rate is small at the large cross section, so that the air continuously accelerates in the first connecting pipe 23 and the second connecting pipe 24 until the supersonic speed, and the flow principle of the supersonic air is opposite to the principle of the Laval nozzle, so that the airflow continues to accelerate, thereby realizing the purpose of not reducing the flow rate of the airflow, while ensuring that the flow rate of the airflow is not reduced, the high-pressure air of the convergent pipe 21 on the air inlet side forms a relatively high-density air wall, the relatively high density forms a sparse and dense threshold, the sound waves within the sparse and dense threshold are blocked, the sound waves outside the threshold are weakened, thereby realizing the noise reduction function.

[0042] The adjusting assembly 3 and the connecting assembly 4 cooperate to adjust the state of the sound-absorbing assembly 2, so that the sound-absorbing assembly 2 can adjust the air flow rate for the initial air flow rate, avoid the case that the initial air flow rate is insufficient or too fast to cause damage to the sound-absorbing assembly 2 and the air outlet net, the air flows out of the expansion pipe 22, is dispersed and guided by the guiding assembly 5, and finally, the sound-absorbed and noise-reduced air is discharged through the air outlet net 13.

[0043] Embodiment two

[0044] Referring to Figures 3-5 and Figure 7 , the adjusting assembly 3 includes a first driven gear 34 and a second driven gear 35 sleeved on the outer sidewalls of the first connecting pipe 23 and the second connecting pipe 24, a driving gear 33 engaged with the first driven gear 34 and the second driven gear 35, a sleeve 31 connected to the top of the driving gear 33, and a connecting rod 32 inserted into the sleeve 31, one end of the sleeve 31 away from the driving gear 33 is arranged through the inner wall of the mesh cylinder 11 and is rotationally connected with the mesh cylinder 11, the connecting rod 32 and the sleeve 31 cooperate to drive the driving gear 33 to rotate, the driving gear 33 drives the first driven gear 34 and the second driven gear 35 to rotate in opposite directions synchronously, so that the first driven gear 34 and the second driven gear 35 can drive the first connecting pipe 23 and the second connecting pipe 24 to rotate, respectively.

[0045] Referring to Figures 7-8 , the inner walls of the contraction pipe 21 and the expansion pipe 22 are connected with flow guide strips 36, the spiral directions of the two groups of flow guide strips 36 are opposite, the first connecting pipe 23 and the second connecting pipe 24 drive the contraction pipe 21 and the expansion pipe 22 to rotate, respectively, the flow guide strips 36 can adjust the air flow rate according to the rotation direction, that is, when the air enters the inside of the contraction pipe 21, part of the air flows along the extension direction of the flow guide strips 36 and the tapered inner wall of the contraction pipe 21, the air flow is guided to form a rotating air flow in the contraction pipe 21, thereby reducing the air resistance of the air flowing from the contraction pipe 21 to the inside of the first connecting pipe 23, and when the air flows to the expansion pipe 22 through the second connecting pipe 24, the air flow can also be guided to form a rotating air flow through the extension direction of the flow guide strips 36 and the inner wall of the expansion pipe 22, thereby achieving the purpose of adjusting the air flow rate.

[0046] Referring to Figure 7 , the inner wall of the sleeve 31 is symmetrically connected with two limiting blocks 37, the outer sidewall of the connecting rod 32 is symmetrically provided with two limiting grooves 38, the two limiting blocks 37 and the two limiting grooves 38 are correspondingly arranged, and the limiting blocks 37 are slidingly connected in the corresponding limiting grooves 38, the connecting rod 32 and the sleeve 31 are detachably connected, that is, when they are connected, the connecting rod 32 is inserted into the sleeve 31, and the limiting grooves 38 and the limiting blocks 37 are inserted into each other, thereby achieving the purpose of limiting the sleeve 31 and the connecting rod 32 in the axial direction.

[0047] Referring to Figures 3-5 andFigure 7 The connecting assembly 4 comprises a first connecting plate 41 and a second connecting plate 42 sleeved on the outer wall of the second connecting pipe 24, one end of the second connecting plate 42 is inserted between the second driven gear 35 and the second connecting pipe 24, the second connecting plate 42 is connected with the second driven gear 35, the first connecting plate 41 is uniformly provided with a micro push rod 43 at one end close to the second connecting plate 42, the second connecting plate 42 is uniformly provided with a positioning hole 44 at one end, the micro push rod 43 and the positioning hole 44 are correspondingly arranged, the piston rod of the micro push rod 43 extends to the inside of the corresponding positioning hole 44, the first connecting plate 41 is connected with the second connecting pipe 24, the second connecting plate 42 is connected with the second driven gear 35, the micro push rod 43 is used for connecting the first connecting plate 41 and the second connecting plate 42, that is, when the piston rod of the micro push rod 43 extends, the piston rod of the micro push rod 43 is attached to one side of the second connecting plate 42, when the positioning hole 44 on the second connecting plate 42 rotates to the position of the piston rod of the micro push rod 43, the piston rod of the micro push rod 43 is inserted into the positioning hole 44, so as to combine and connect the first connecting plate 41 and the second connecting plate 42, so that they can rotate synchronously, on the contrary, when the micro push rod 43 is retracted, the first connecting plate 41 and the second connecting plate 42 are separated, the second connecting plate 42 continues to rotate with the second driven gear 35, while the first connecting plate 41 and the second connecting pipe 24 are free to rotate and stop rotating.

[0048] Specifically, during the conveying of the air injection pipe, if the air flow rate discharged into the inside of the contraction pipe 21 is low, in order to avoid that the air entering the inside of the first connecting pipe 23 cannot reach supersonic speed, at this time, the staff connects the external driving device with the connecting rod 32, the external driving device can be a motor, which is not limited here, the external driving device drives the connecting rod 32, the sleeve pipe 31 and the driving gear 33 to rotate, so that the first driven gear 34 and the second driven gear 35 rotate synchronously, and the rotation directions of the first driven gear 34 and the second driven gear 35 are opposite, at this time, the first connecting plate 41 and the second connecting plate 42 remain in a separated state, the first driven gear 34 drives the first connecting pipe 23 and the contraction pipe 21 to rotate, the flow guide strip 36 in the contraction pipe 21 rotates synchronously, so that the air rotates and is guided to form a rotating air flow, ensuring the air flow rate entering the first connecting pipe 23.

[0049] If the air flow rate flowing into the contraction pipe 21 is high, in order to avoid that the over-wind net cannot withstand the high-speed flowing air, the first driven gear 34 and the second driven gear 35 rotate synchronously and oppositely, at this time, the piston rod of the micro push rod 43 extends into the positioning hole 44, thereby connecting the first connecting plate 41 and the second connecting plate 42, when the first driven gear 34 and the second driven gear 35 rotate, the contraction pipe 21 and the expansion pipe 22 are driven to rotate reversely, the flow guide strip 36 in the contraction pipe 21 collides with the air and pushes the air to form a reverse resistance, thereby reducing the air flow rate, and then the air flow rate is increased through the flow guide strip 36 in the first connecting pipe 23, the second connecting pipe 24 and the expansion pipe 22 and a rotational flow is formed, thereby ensuring the air flow rate. The above two adjustment modes can be switched according to the situation during air conveying, without affecting the air conveying.

[0050] Embodiment three

[0051] Referring to Figures 3-6 , the guide assembly 5 comprises a ring body 51 rotatably connected to the inner wall of the net cylinder 11, a gap is arranged between one end of the ring body 51 and one end of the expansion pipe 22, and a gap is also arranged between the expansion pipe 22 and the inner wall of the net cylinder 11, and the two gaps are communicated.

[0052] Referring to Figure 3 , the inner wall of the ring body 51 is provided with a support 52, one side of the support 52 is provided with a guide block 53, the guide block 53 is conical, and the guide block 53 is coaxially arranged with the expansion pipe 22 and the net cylinder 11, the support 52 is used for supporting the guide block 53, and the guide block 53 is used for dispersing and guiding the flowing air, that is, the air flows to the position of the conical part of the guide block 53, and then the air is dispersed along the conical surface, part of the air continues to flow to the direction of the air outlet net 13 along the inner wall of the net cylinder 11, and the other part of the air is intercepted by the ring body 51 and flows reversely into the gap, and then is discharged through the hole outside the net cylinder 11.

[0053] Referring to Figures 4-6 , the end of the expansion pipe 22 away from the contraction pipe 21 is uniformly connected with a plug rod 54, one end of the ring body 51 is uniformly provided with a through hole corresponding to the plug rod 54, one end of the plug rod 54 is inserted into the corresponding through hole, and the expansion pipe 22 is connected with the ring body 51 through the plug rod 54, and the ring body 51 limits the expansion pipe 22.

[0054] Specifically, the expansion pipe 22 is connected with the ring body 51 through the plug rod 54, the air flows out through the expansion pipe 22 after being silenced and de-noised by the silencing assembly 2, then the air flows to the position of the conical part of the guide block 53, then the air is dispersed along the conical surface, part of the air continues to flow to the direction of the air outlet net 13 along the inner wall of the net cylinder 11, and the other part of the air is intercepted by the ring body 51 and flows reversely into the gap, and then is discharged through the hole outside the net cylinder 11, avoiding that the high-speed flowing air directly contacts the air outlet net 13 to cause damage to the air outlet net 13.

[0055] Obviously, the above described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative labor should belong to the protection scope of the present application.

Claims

1. A sound attenuation and noise reduction wind passing net which does not reduce the flow rate, characterized in that: The application relates to a sound-absorbing device, which comprises a main body assembly (1), a sound-absorbing assembly (2) arranged in the main body assembly (1), a guiding assembly (5), a connecting assembly (4) connected to the outside of the sound-absorbing assembly (2) and an adjusting assembly (3) connected to the sound-absorbing assembly (2) and extending to the outside of the main body assembly (1). The main body assembly (1) comprises a mesh cylinder (11), and the sound-absorbing assembly (2), the adjusting assembly (3), the connecting assembly (4) and the guiding assembly (5) are arranged in the mesh cylinder (11). The sound-absorbing assembly (2) comprises a contraction pipe (21) and an expansion pipe (22), the contraction pipe (21) and the expansion pipe (22) are arranged in the mesh cylinder (11), the contraction pipe (21), the expansion pipe (22) and the mesh cylinder (11) are coaxially arranged, a first connecting pipe (23) is communicated with one end of the contraction pipe (21) close to the expansion pipe (22), a second connecting pipe (24) is communicated with one end of the expansion pipe (22) close to the contraction pipe (21), the inner diameter of the first connecting pipe (23) is consistent with the outer diameter of the second connecting pipe (24), the first connecting pipe (23) and the second connecting pipe (24) are insertedly arranged, and one end of the contraction pipe (21) away from the expansion pipe (22) is connected with the inner wall of the mesh cylinder (11). The adjusting assembly (3) comprises a first driven gear (34) and a second driven gear (35) sleeved on the outer sidewalls of the first connecting pipe (23) and the second connecting pipe (24), a driving gear (33) engaged with the first driven gear (34) and the second driven gear (35), a sleeve (31) connected to the top of the driving gear (33) and a connecting rod (32) inserted in the sleeve (31). The inner walls of the contraction pipe (21) and the expansion pipe (22) are connected with flow guide strips (36), and the spiral directions of the two groups of flow guide strips (36) are opposite.

2. The noise reduction and sound attenuation wind screen of claim 1, wherein: The main body assembly (1) further comprises an air inlet mesh (12) and an air outlet mesh (13), the air inlet mesh (12) and the air outlet mesh (13) are respectively arranged at the two ends of the mesh cylinder (11), and one end of the contraction pipe (21) away from the expansion pipe (22) is attached to the air inlet mesh (12).

3. The noise reduction and sound attenuation screen of claim 1, wherein: One end of the sleeve (31) away from the driving gear (33) is arranged in the inner wall of the mesh cylinder (11) and rotationally connected with the mesh cylinder (11).

4. The noise reduction and sound attenuation screen of claim 3, wherein: The inner wall of the sleeve (31) is symmetrically connected with two limiting blocks (37), the outer sidewall of the connecting rod (32) is symmetrically provided with two limiting grooves (38), the two limiting blocks (37) are correspondingly arranged with the two limiting grooves (38), and the limiting blocks (37) are slidingly connected in the corresponding limiting grooves (38).

5. The noise reduction and sound attenuation screen of claim 4, wherein: The connecting assembly (4) comprises a first connecting plate (41) and a second connecting plate (42) sleeved on the outer wall of the second connecting pipe (24), one end of the second connecting plate (42) is inserted between the second driven gear (35) and the second connecting pipe (24), the second connecting plate (42) is connected with the second driven gear (35), one end of the first connecting plate (41) close to the second connecting plate (42) is uniformly provided with a micro push rod (43), one end of the second connecting plate (42) is uniformly provided with a positioning hole (44), the micro push rod (43) and the positioning hole (44) are correspondingly arranged, and the piston rod of the micro push rod (43) extends to the inside of the corresponding positioning hole (44).

6. The noise reduction and sound attenuation screen of claim 1, wherein: The guiding assembly (5) comprises a ring body (51) rotationally connected to the inner wall of the mesh cylinder (11), a gap is arranged between one end of the ring body (51) and one end of the expansion pipe (22), and a gap is also arranged between the expansion pipe (22) and the inner wall of the mesh cylinder (11), and the two gaps are communicated.

7. The noise reduction and sound attenuation screen of claim 6, wherein: The inner wall of the ring body (51) is provided with a support (52), one side of the support (52) is provided with a guide block (53), the guide block (53) is conical, and the guide block (53) is coaxially arranged with the expansion pipe (22) and the mesh cylinder (11).

8. The noise reduction and sound attenuation screen of claim 7, wherein: One end of the expansion pipe (22) away from the contraction pipe (21) is uniformly connected with a plug rod (54), one end of the ring body (51) is uniformly provided with a through hole corresponding to the plug rod (54), and one end of the plug rod (54) is inserted into the corresponding through hole.

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