Noise reducing vent riser

Abstract

The application relates to the technical field of natural gas transportation, in particular to a noise reduction type venting stand pipe. The noise reduction type venting stand pipe comprises a stand pipe body and a noise reduction assembly arranged in the stand pipe body and used for reducing noise in the exhaust process; wherein the noise reduction assembly comprises a first noise reduction unit, the first noise reduction unit comprises first rotating blades and second rotating blades, the first rotating blades and the second rotating blades are arranged at intervals along the airflow direction, the first rotating blades and the second rotating blades are arranged to rotate in the circumferential direction of the stand pipe body after being impacted by the airflow, and the rotating directions of the first rotating blades and the second rotating blades are opposite. According to the above technical scheme, the problem that a large noise is generated when the venting stand pipe is directly vented in the prior art can be solved. Moreover, since the rotating directions of the first rotating blades and the second rotating blades are opposite, the work of the blades located downstream is increased, the airflow kinetic energy consumption is increased, and the airflow flow rate is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas transportation, in particular to a noise reduction venting riser. BACKGROUND

[0002] In the process of natural gas transportation, a venting riser is usually arranged at a natural gas transportation station and a valve chamber. The venting riser mainly has the following functions: protecting the pipeline from overpressure; and emergency venting in case of an accident to reduce loss. At present, the natural gas station and the valve chamber mainly adopt a direct venting form. This makes the venting riser produce a large noise when venting, which has an impact on the surrounding environment and the workers. SUMMARY

[0003] The embodiments of the present application at least provide a noise reduction venting riser to solve the problem that the venting riser directly vents and produces a large noise in the prior art.

[0004] The embodiments of the present application provide a noise reduction venting riser, which comprises:

[0005] a riser body;

[0006] a noise reduction assembly arranged in the riser body and used for reducing noise in the process of exhaust;

[0007] The noise reduction assembly comprises a first noise reduction unit, the first noise reduction unit comprises first rotating blades and second rotating blades, the first rotating blades and the second rotating blades are arranged at intervals along the airflow direction, the first rotating blades and the second rotating blades are arranged to rotate in the circumferential direction of the riser body after being impacted by the airflow, and the rotating directions of the first rotating blades and the second rotating blades are opposite.

[0008] In an optional embodiment, the first noise reduction unit further comprises a connecting pipe, and the first rotating blades and the second rotating blades are respectively installed in two ends of the connecting pipe.

[0009] In an optional embodiment, the number of the first noise reduction units is multiple, and the multiple first noise reduction units are arranged at intervals in the circumferential direction of the riser body.

[0010] In an optional embodiment, the first noise reduction unit further comprises multiple guide plates, the multiple guide plates are located downstream of the first rotating blades and the second rotating blades, the surfaces of the multiple guide plates are parallel to the axial direction of the riser body, and the multiple guide plates are arranged at intervals in the lateral direction of the riser body.

[0011] In an alternative embodiment, the noise reduction assembly further comprises a second noise reduction unit, the second noise reduction unit comprising a gas tube and a gas cap, the gas tube being configured to allow gas flow therethrough, the gas cap having a cap opening facing the gas outlet end of the gas tube, the gas cap being configured to reflect sound waves to resonate and cancel sound.

[0012] In an alternative embodiment, the inner wall of the gas cap is provided with protrusions.

[0013] In an alternative embodiment, the noise reduction assembly further comprises a third noise reduction unit, the third noise reduction unit comprising a flow guide elbow and a first orifice silencer, the flow guide elbow having a gas outlet end located inside the riser body, the first orifice silencer being arranged along the gas flow direction, one end of the first orifice silencer being closed and the other end of the first orifice silencer being in communication with the gas outlet end of the flow guide elbow, the first orifice silencer being configured to allow gas flow through the orifices on the sidewall of the first orifice silencer into the interior of the riser body.

[0014] In an alternative embodiment, the third noise reduction unit further comprises a second orifice silencer, a first baffle and a second baffle, the second orifice silencer being arranged along the gas flow direction and located downstream of the first orifice silencer, one end of the second orifice silencer being closed and connected to the first orifice silencer, the other end of the second orifice silencer being in communication with the interior of the riser body, the first baffle being arranged between the first orifice silencer and the riser body, the second baffle being arranged between the second orifice silencer and the riser body, the first baffle and the second baffle being configured to allow gas flow through the orifices on the sidewall of the second orifice silencer into the interior of the second orifice silencer.

[0015] In an alternative embodiment, the orifices on the sidewall of the second orifice silencer and the orifices on the sidewall of the first orifice silencer have different diameters.

[0016] In an alternative embodiment, the noise reduction assembly further comprises a fourth noise reduction unit, the fourth noise reduction unit comprising a third orifice silencer, a third baffle and a connecting rod, the third orifice silencer being arranged along the gas flow direction, the gas inlet end of the third orifice silencer being fixed to the inner wall of the riser body through the third baffle, the gas outlet end of the third orifice silencer being fixed to the inner wall of the riser body through the connecting rod, the third orifice silencer, the third baffle and the connecting rod being configured to allow gas flow through the interior of the third orifice silencer and the orifices on the sidewall thereof.

[0017] In an alternative embodiment, the riser body comprises a first pipe segment and a second pipe segment in communication, the second pipe segment being located downstream of the first pipe segment, the second pipe segment having a larger diameter than the first pipe segment.

[0018] The above technical solutions of the present application have the following beneficial technical effects:

[0019] The noise reduction assembly of the noise reduction venting riser provided by the present application includes a first noise reduction unit, and the first noise reduction unit includes a first rotating blade and a second blade. After being impacted by the airflow, the first rotating blade and the second blade convert kinetic energy into mechanical energy, which can reduce the flow rate of the airflow and reduce the noise in the exhaust process, thereby solving the problem that a large noise is generated when the venting riser is directly vented in the prior art. In addition, since the rotating directions of the first rotating blade and the second rotating blade are opposite, the rotating direction of the airflow passing through the first rotating blade is different from the rotating direction of the airflow passing through the second rotating blade. Therefore, in addition to overcoming the rotating resistance of the blade itself, the blade located downstream also needs to overcome the turning resistance of the airflow, which increases the work of the blade located downstream, that is, the kinetic energy consumption of the airflow increases, and the flow rate of the airflow is lower.

[0020] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. The drawings herein are incorporated into the specification and form a part of the specification, which show the embodiments consistent with the present application and are used to illustrate the technical solutions of the present application together with the specification. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 Fig. 1 shows a structural schematic diagram of a noise reduction venting riser provided by an embodiment of the present application;

[0023] Figure 2 Fig. 4 shows a structural schematic diagram of a foot ring provided by an embodiment of the present application;

[0024] Figure 3 Fig. 5 shows a structural schematic diagram of a first noise reduction unit provided by an embodiment of the present application;

[0025] Figure 4 Fig. 6 shows a structural schematic diagram of a second noise reduction unit provided by an embodiment of the present application; Figure 1 Fig. 7 shows a sectional view of A-A in Fig. 6;

[0026] Figure 5 Fig. 8 shows a structural schematic diagram of a third noise reduction unit provided by an embodiment of the present application;

[0027] Figure 6 Fig. 3 shows a structural schematic diagram of a third noise reduction unit provided by an embodiment of the present application;

[0028] Figure 7 Fig. 4 shows a structural schematic diagram of a fourth noise reduction unit provided by an embodiment of the present application;

[0029] Reference signs:

[0030] 1, riser body; 11, first pipe section; 12, second pipe section; 2, foot ring; 21, upper end plate; 22, lower end plate; 23, rib plate; 24, anchor bolt; 3, first noise reduction unit; 31, first rotating blade; 32, second rotating blade; 33, rotating shaft; 34, bracket; 35, connecting pipe; 36, flow guide plate; 4, second noise reduction unit; 41, air pipe; 42, air cap; 43, conical protrusion; 5, third noise reduction unit; 51, flow guide elbow; 52, first small-hole muffler; 53, second small-hole muffler; 54, first baffle; 55, second baffle; 6, fourth noise reduction unit; 61, third small-hole muffler; 62, third baffle; 63, connecting rod; 7, blowdown port. DETAILED DESCRIPTION

[0031] It should be noted that, unless otherwise defined, technical or scientific terms used in one or more embodiments of the present application should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", and similar terms used in one or more embodiments of the present application do not necessarily mean any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0032] During natural gas transportation, a vent riser is usually arranged at a natural gas transportation station and a valve chamber. The vent riser mainly has the following functions: protecting the pipeline from overpressure; and emergency venting in case of an accident to reduce losses. At present, the natural gas station and the valve chamber mainly adopt a direct venting form. This causes the vent riser to generate a large noise when venting, which affects the surrounding environment and the workers.

[0033] Therefore, an embodiment of the present application provides a noise reduction vent riser to improve the problem that the vent riser directly vents to generate a large noise in the prior art.

[0034] For the purpose, technical solutions and advantages of the present application, the following will be combined with specific drawings and examples to make a detailed description.

[0035] Reference Figure 1 And Figure 2 The noise reduction type venting riser provided by the embodiment of the present application includes a riser body 1 and a foot ring 2. The riser body 1 is vertically arranged, the side wall of the riser body 1 is provided with a gas inlet for inputting natural gas into the interior thereof, and the upper end of the riser body 1 is provided with a gas outlet for discharging natural gas. The foot ring 2 is sleeved on the lower end of the outer wall of the riser body 1 and is connected and fixed with the riser body 1, and the foot ring 2 is used for connecting with the ground through foundation bolts 24, so as to fix the riser body 1 on the ground.

[0036] Reference Figure 1 Optionally, in the embodiment of the present application, the side wall surface of the venting riser can be provided with a pollution discharge port for discharging impurities such as dust, rainwater and the like in the venting riser.

[0037] Reference Figure 2 Optionally, in the embodiment of the present application, the foot ring 2 can include an upper end plate 21, a lower end plate 22 and a rib plate 23. The upper end plate 21 and the lower end plate 22 are both sleeved on the outer wall of the riser body 1, and the upper end plate 21 and the lower end plate 22 have a spacing therebetween. The number of the rib plate 23 is multiple, and the multiple rib plates 23 are arranged between the upper end plate 21 and the lower end plate 22 and are distributed in a spaced apart manner along the circumference of the riser body 1. The foot ring 2 thus arranged has a large strength, which is conducive to improving the stability of the venting riser.

[0038] The noise reduction type venting riser provided by the embodiment of the present application further includes a noise reduction assembly arranged in the interior of the riser body 1 and used for reducing noise in the exhaust process. In this way, the problem that the venting riser in the prior art directly vents and generates a large noise can be improved.

[0039] Reference Figure 1 Optionally, in the embodiment of the present application, the noise reduction assembly includes a first noise reduction unit 3, which can be used for consuming kinetic energy of gas flow to reduce noise in the exhaust process.

[0040] In the specific arrangement, the first noise reduction unit 3 is located between the gas inlet end and the gas outlet end of the riser body 1 and is located close to the gas inlet end of the riser body 1.

[0041] Reference Figure 3Optionally, in the embodiments of the present application, the first noise reduction unit 3 comprises a first rotating blade 31 and a second rotating blade 32, the first rotating blade 31 and the second rotating blade 32 are arranged in the airflow direction, the first rotating blade 31 and the second rotating blade 32 are arranged to rotate in the circumferential direction of the riser body 1 after being impacted by the airflow, and the rotating directions of the first rotating blade 31 and the second rotating blade 32 are opposite. In use, the rotating direction of the first rotating blade 31 can be clockwise, and the rotating direction of the second rotating blade 32 can be counterclockwise.

[0042] In a specific arrangement, the first rotating blade 31 and the second rotating blade 32 can be installed in the riser body 1 through a rotating shaft 33, and the rotating shaft 33 is installed through a support 34, as shown in Figure 3 It should be understood that the first rotating blade 31 and the second rotating blade 32 can also be installed by other installation methods. For example, the first rotating blade 31 and the second rotating blade 32 can be installed in the riser body 1 through a rotating wheel. Specifically, the first rotating blade 31 and the second rotating blade 32 are respectively installed in different rotating wheels and fixedly connected with the corresponding rotating wheels, and the rotating wheel is rotatably connected with the riser body 1 in the circumferential direction. When the airflow impacts the first rotating blade 31 and the second rotating blade 32, the first rotating blade 31 and the second rotating blade 32 rotate through the corresponding rotating wheels.

[0043] In the above technical solution, the first rotating blade 31 and the second rotating blade 32 convert kinetic energy into mechanical energy after being impacted by the airflow, which can reduce the flow rate of the airflow and thus reduce the noise during exhaust.

[0044] In addition, it should be noted that the airflow rotates under the action of the first rotating blade 31 and the second rotating blade 32 while rotating the first rotating blade 31 and the second rotating blade 32. Moreover, since the rotating directions of the first rotating blade 31 and the second rotating blade 32 are opposite, the rotating directions of the airflow passing through the first rotating blade 31 and the second rotating blade 32 are also different. For example, the airflow spirals forward in the clockwise direction after passing through the first rotating blade 31, and the airflow spirals forward in the counterclockwise direction after passing through the second rotating blade 32. Therefore, in addition to overcoming the rotating resistance of the downstream blade (the second rotating blade), the downstream blade also needs to overcome the turning resistance of the airflow, which increases the work done by the downstream blade, i.e., the kinetic energy consumption of the airflow increases, and the flow rate of the airflow is lower.

[0045] It should be noted that the energy consumption capacity of the first rotating blade 31 and the second rotating blade 32 is associated with the friction between the first rotating blade 31 and the second rotating blade 32 and the rotating shaft 33 or the friction between the rotating wheel and the riser body 1. In specific implementation, the friction parameters between the related components can be selected according to actual needs.

[0046] With reference to Figure 3 Optionally, in the embodiment of the present application, the first noise reduction unit 3 further comprises a connecting pipe 35, and the first rotating blade 31 and the second rotating blade 32 are respectively installed in two ends of the connecting pipe 35. Specifically, the connecting pipe 35 is arranged along the airflow direction, the connecting pipe 35 is arranged to allow the upstream airflow to flow from the inside of the connecting pipe 35 to the downstream, the first rotating blade 31 is installed at one end of the connecting pipe 35 close to the upstream, and the second rotating blade 32 is installed at the other end of the connecting pipe 35 close to the downstream. In use, noise can be generated due to airflow rotation, and the noise can be blocked by the connecting pipe 35, thereby effectively reducing the noise.

[0047] With reference to Figure 4 Optionally, in the embodiment of the present application, the first noise reduction unit 3 comprises a plurality of groups of blades (the first rotating blade 31 and the second rotating blade 32), and the plurality of groups of blades are spaced apart along the circumferential direction of the stand pipe body 1. In a specific implementation, the plurality of groups of blades can be respectively located at different radial positions of the stand pipe body 1. In a specific arrangement.

[0048] With reference to Figure 3 Optionally, in the embodiment of the present application, the first noise reduction unit 3 further comprises a plurality of guide plates 36, the plurality of guide plates 36 are located downstream of the first rotating blade 31 and the second rotating blade 32, the surfaces of the plurality of guide plates 36 are parallel to the axial direction of the stand pipe body 1, and the plurality of guide plates 36 are spaced apart along the transverse direction of the stand pipe body 1. Specifically, the plurality of guide plates 36 form a plurality of cavities parallel to each other, and the plurality of cavities can change the direction of the airflow and adjust the distribution of the airflow, thereby avoiding the generation of vortex aerodynamic noise due to large local airflow velocity pressure gradient.

[0049] With reference to Figure 1 Optionally, in the embodiment of the present application, the noise reduction assembly further comprises a second noise reduction unit 4, and the second noise reduction unit 4 is configured to reduce the noise of the airflow by resonance.

[0050] In a specific arrangement, the second noise reduction unit 4 can be arranged upstream of the first noise reduction unit 3, or arranged downstream of the first noise reduction unit 3. For example, in the embodiment of the present application, the second noise reduction unit 4 is arranged downstream of the first noise reduction unit 3.

[0051] With reference to Figure 5Optionally, in the embodiment of the present application, the second noise reduction unit 4 comprises an air tube 41 and an air cap 42, the air tube 41 is arranged along the air flow direction and is arranged to allow air flow to flow through the inside of the air tube 41, and the air cap 42 is arranged to face the air outlet end of the air tube 41, and the air cap 42 is arranged to reflect sound waves to perform resonance noise reduction. Specifically, the side of the air cap 42 facing the air outlet end of the air tube 41 has a concave cavity, and the air outlet end of the air tube 41 is located in the concave cavity of the air cap 42 and is fixedly connected with the air cap 42. In use, the concave cavity of the air cap 42 can be used as an expansion chamber, and when the air flow enters the expansion chamber, sound wave reflection occurs, and the reflected sound waves can produce resonance phenomenon, thereby realizing resonance noise reduction.

[0052] In a specific arrangement, the concave surface of the air cap 42 can be a hemispherical surface. In order to increase the number of times of reflection of sound waves in the concave cavity, the concave surface of the air cap 42 can be provided with a convex structure, such as a spherical convex, a conical convex 43, etc. In the embodiment of the present application, the concave surface of the air cap 42 is preferably provided with a conical convex 43.

[0053] In a specific arrangement,

[0054] It should be noted that in order to avoid pressure build-up, the cap opening of the air cap 42 is designed to be open, and the reflected air flow can flow out of the cap opening of the air cap 42.

[0055] Reference Figure 1 Optionally, in the embodiment of the present application, the noise reduction assembly further comprises a third noise reduction unit 5, and the third noise reduction unit 5 is used to reduce the noise of the air flow in the manner of small hole noise reduction.

[0056] In a specific arrangement, the third noise reduction unit 5 can be arranged upstream of the first noise reduction unit 3, or arranged downstream of the first noise reduction unit 3. In the embodiment of the present application, the third noise reduction unit 5 is arranged upstream of the first noise reduction unit 3, and the third noise reduction unit 5 is connected with the air inlet end of the stand pipe body 1.

[0057] Reference Figure 1 and Figure 6Optionally, in the embodiments of the present application, the third noise reduction unit 5 comprises a flow guide elbow 51 and a first small-hole muffler 52. The outlet end of the flow guide elbow 51 is located in the stand pipe body 1, and the first small-hole muffler 52 is arranged along the airflow direction. One end of the first small-hole muffler 52 is closed, and the other end is in communication with the outlet end of the flow guide elbow 51. The first small-hole muffler 52 is arranged to allow the airflow to flow into the stand pipe body 1 through the small holes in the side wall of the first small-hole muffler 52. Specifically, the end of the first small-hole muffler 52 away from the flow guide elbow 51 is closed, which makes the airflow in the first small-hole muffler 52 flow to the downstream of the stand pipe body 1 through the small holes in the side wall of the first small-hole muffler 52. In use, the airflow can be sprayed out through the small holes in the side wall of the first small-hole muffler 52. Due to different impedance sections, part of the sound waves is returned to the sound source. At the same time, when the airflow passes through the small holes, the flow rate is dispersed, thereby reducing the airflow speed and the sound power. Moreover, in the above process, the airflow is diverted, which also reduces the airflow speed.

[0058] In specific arrangement, the hole diameter of the small holes in the side wall of the first small-hole muffler 52 is 3-5 mm, and the total area of the small holes is 1.5-3.0 times the flow passage section of the first small-hole muffler 52. Moreover, the small holes can be arranged in a regular matrix mode or an irregular arrangement mode.

[0059] Reference Figure 1 and Figure 6Optionally, in the embodiment of the present application, the third noise reduction unit 5 further comprises a second small-hole muffler 53, a first baffle 54 and a second baffle 55. The second small-hole muffler 53 is arranged along the airflow direction and located downstream of the first small-hole muffler 52. One end of the second small-hole muffler 53 is closed and connected with the first small-hole muffler 52, and the other end of the second small-hole muffler 53 is connected with the inside of the standpipe body 1. The first baffle 54 is arranged between the first small-hole muffler 52 and the standpipe body 1, and the second baffle 55 is arranged between the second small-hole muffler 53 and the standpipe body 1. The first baffle 54 and the second baffle 55 are arranged to allow the airflow to flow into the inside of the second small-hole muffler 53 through the small holes in the side wall of the second small-hole muffler 53. Specifically, the first baffle 54 and the second baffle 55 are used to realize the sealing of the structure, so that an annular cavity is formed between the first baffle 54, the second baffle 55, the standpipe body 1, the first small-hole muffler 52 and the second small-hole muffler 53. One end of the annular cavity is connected with the first small-hole muffler 52, and the other end is connected with the second small-hole muffler 53. Therefore, after the airflow is sprayed out through the small holes in the side wall of the first small-hole muffler 52, it needs to flow into the inside of the second small-hole muffler 53 through the small holes in the side wall of the second small-hole muffler 53 to flow downstream. In the use process, since the airflow passes through the small holes in the side wall of the second small-hole muffler 53, based on the same principle, when the airflow passes through the small holes, the flow rate is dispersed, thereby reducing the airflow speed and reducing the sound power. Moreover, in the above process, the airflow is diverted, which can also reduce the airflow speed. In addition, when the airflow flows into the standpipe body 1 from the second small-hole muffler 53, the flow cross section increases, which can also reduce the airflow speed.

[0060] In a specific arrangement, the first baffle 54 and the first small-hole muffler 52 can be an integral structure. In this way, the connection strength between the first baffle 54 and the first small-hole muffler 52 can be improved.

[0061] In a specific arrangement, the second baffle 55 and the second small-hole muffler 53 can be an integral structure. In this way, the connection strength between the second baffle 55 and the second small-hole muffler 53 can be improved.

[0062] In a specific arrangement, the small holes in the side wall of the second small-hole muffler 53 and the small holes in the side wall of the first small-hole muffler 52 have different diameters. For example, the diameters of the small holes in the side wall of the second small-hole muffler 53 are 2-3 mm, and the total area of the small holes is 1.5-3.0 times the flow cross section of the second small-hole muffler 53. Moreover, the small holes can be arranged in a regular matrix manner or an irregular arrangement manner.

[0063] Reference Figure 1 Optionally, in the embodiment of the present application, the noise reduction assembly further comprises a fourth noise reduction unit 6, which is used to reduce the noise of the airflow in the form of small-hole muffling.

[0064] In a specific arrangement, the fourth noise reduction unit 6 can be arranged upstream of the first noise reduction unit 3 or downstream of the first noise reduction unit 3. In the embodiment of the present application, the fourth noise reduction unit 6 is arranged downstream of the first noise reduction unit 3 and at the outlet end of the riser body 1.

[0065] Reference is made to Figure 1 and Figure 7 Optionally, in the embodiment of the present application, the fourth noise reduction unit 6 comprises a third small-hole muffler 61, a third baffle 62 and a connecting rod 63. The third small-hole muffler 61 is arranged along the direction of the airflow. The inlet end of the third small-hole muffler 61 is fixed to the inner wall of the riser body 1 by the third baffle 62. The outlet end of the third small-hole muffler 61 is fixed to the inner wall of the riser body 1 by the connecting rod 63. The third small-hole muffler 61, the third baffle 62 and the connecting rod 63 are arranged to allow the airflow to flow through the inside of the third small-hole muffler 61 and the small holes on the side wall surface of the third small-hole muffler 61. Specifically, the third baffle 62 is used to achieve a seal between structures, so that the upstream airflow needs to pass through the inside of the third small-hole muffler 61 and the small holes on the side wall surface of the third small-hole muffler 61 to flow to the downstream. In use, the airflow can be sprayed out of the small holes on the side wall surface of the third small-hole muffler 61. Due to different impedance sections, part of the sound waves is returned to the sound source. At the same time, when the airflow passes through the small holes, the flow rate is dispersed, thereby reducing the airflow speed and the sound power. Moreover, in the above process, the airflow is diverted, which also helps to reduce the airflow speed.

[0066] In a specific arrangement, the third small-hole muffler 61, the third baffle 62 and the connecting rod 63 can be an integral structure, which can improve the connection strength between components.

[0067] In a specific arrangement, the small holes on the side wall surface of the third small-hole muffler 61, the small holes on the side wall surface of the first small-hole muffler 52 and the small holes on the side wall surface of the second small-hole muffler 53 have different diameters. For example, the diameter of the small holes on the side wall surface of the third small-hole muffler 61 is 1-2 mm. Moreover, the small holes can be arranged in a regular matrix or an irregular arrangement.

[0068] Optionally, in the embodiment of the present application, the riser body 1 comprises a first pipe section 11 and a second pipe section 12 connected in series. The second pipe section 12 is arranged downstream of the first pipe section 11. The diameter of the second pipe section 12 is greater than that of the first pipe section 11. In this way, the airflow can be decelerated when flowing from the first pipe section 11 to the second pipe section 12, which is conducive to reducing the noise.

[0069] In a specific arrangement, the first pipe section 11 and the second pipe section 12 can be respectively provided with at least one noise reduction unit. For example, the first pipe section 11 is provided with a first noise reduction unit 3, a second noise reduction unit 4 and a third noise reduction unit 5, and the second pipe section 12 is provided with a fourth noise reduction unit 6.

[0070] One or more embodiments of the present specification are intended to cover all such alternatives, modifications, and variations falling within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification should be included in the scope of the present application.

[0071] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A noise-reducing venting riser, characterized in that, include: Riser body; A noise reduction component is installed inside the riser body to reduce noise during the exhaust process; The noise reduction component includes a first noise reduction unit, which includes multiple connecting pipes and multiple sets of blades. The multiple connecting pipes are parallel to each other and extend along the axial direction of the riser body. The multiple sets of blades are respectively disposed in the multiple connecting pipes. Each set of blades includes a first rotating blade and a second rotating blade. The first rotating blade and the second rotating blade are spaced apart along the airflow direction. The first rotating blade and the second rotating blade are respectively installed in the two ends of the connecting pipe. The first rotating blade and the second rotating blade are configured to rotate circumferentially relative to the riser body after being impacted by airflow, and the rotation directions of the first rotating blade and the second rotating blade are opposite. The first noise reduction unit further includes multiple guide plates, which are located downstream of the first rotating blade and the second rotating blade. The multiple guide plates are axially spaced from the first rotating blade and the second rotating blade. The surfaces of the multiple guide plates are parallel to the axial direction of the riser body, and the multiple guide plates are distributed at lateral intervals along the riser body. The noise reduction assembly further includes a third noise reduction unit located upstream of the first noise reduction unit. The third noise reduction unit includes a flow guide bend and a first small-hole silencer. The air outlet of the flow guide bend is located inside the riser body. The first small-hole silencer is arranged along the airflow direction. One end of the first small-hole silencer is closed, and the other end is connected to the air outlet of the flow guide bend. The first small-hole silencer is configured to allow airflow to flow into the interior of the riser body through the small holes on the side wall of the first small-hole silencer. The noise reduction assembly further includes a fourth noise reduction unit located downstream of the first noise reduction unit. The fourth noise reduction unit includes a third small-hole silencer, a third baffle, and a connecting rod. The third small-hole silencer is arranged along the airflow direction. The air inlet of the third small-hole silencer is circumferentially fixed to the inner wall of the riser body through the third baffle. The air outlet of the third small-hole silencer is circumferentially fixed to the inner wall of the riser body through the connecting rod. The third small-hole silencer, the third baffle, and the connecting rod are configured to allow airflow to pass through the small holes inside the third small-hole silencer and its sidewalls.

2. The noise-reducing venting riser according to claim 1, characterized in that, The noise reduction component further includes a second noise reduction unit, which includes a trachea and an air cap. The trachea is configured to allow airflow through its interior, and the opening of the air cap faces the outlet of the trachea. The air cap is configured to reflect sound waves for resonance noise reduction.

3. The noise-reducing vent riser according to claim 2, characterized in that, The inner wall of the air cap is provided with protrusions.

4. The noise-reducing venting riser according to claim 1, characterized in that, The third noise reduction unit further includes a second small-hole silencer, a first baffle, and a second baffle. The second small-hole silencer is arranged along the airflow direction and is located downstream of the first small-hole silencer. One end of the second small-hole silencer is closed and connected to the first small-hole silencer, and the other end of the second small-hole silencer is connected to the interior of the riser body. The first baffle is arranged between the first small-hole silencer and the riser body, and the second baffle is arranged between the second small-hole silencer and the riser body. The first baffle and the second baffle are configured to allow airflow to flow into the interior of the second small-hole silencer through the small holes on the side wall of the second small-hole silencer.

5. The noise-reducing vent riser according to claim 4, characterized in that, The diameter of the small hole on the side wall of the second small hole silencer is different from that of the small hole on the side wall of the first small hole silencer.

6. The noise-reducing venting riser according to claim 1, characterized in that, The riser body includes a first pipe section and a second pipe section that are connected to each other. The second pipe section is located downstream of the first pipe section, and the diameter of the second pipe section is larger than the diameter of the first pipe section.

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