Noise reduction type emptying vertical pipe

Abstract

The invention relates to the technical field of natural gas transportation, in particular to a noise reduction type emptying vertical pipe. The noise reduction type emptying vertical pipe comprises a vertical pipe body, the noise reduction assembly is arranged in the vertical pipe body and used for reducing noise in the exhaust process; 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 in the airflow direction at intervals, and the first rotating blades and the second rotating blades are arranged to rotate in the circumferential direction relative to the vertical pipe body after being impacted by airflow. And the rotating directions of the first rotating blade and the second rotating blade are opposite. According to the technical scheme, the problem that in the prior art, when an emptying vertical pipe is directly emptied, large noise can be generated can be solved. Moreover, as the rotation directions of the first rotating blade and the second rotating blade are opposite, the acting of the blades positioned at the downstream is increased, the kinetic energy consumption of air flow is increased, and the flow speed of the air flow is lower.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas transportation, and in particular to a noise-reducing venting riser. Background Art

[0002] During the natural gas transmission process, venting risers are usually installed in natural gas transmission stations and valve rooms. The main functions of venting risers are as follows: protecting pipelines from overpressure; emergency venting in case of emergencies to reduce losses. At present, natural gas stations and valve rooms mainly adopt direct venting. This makes the venting riser generate a lot of noise when venting, which affects the surrounding environment and workers. Summary of the invention

[0003] The embodiments of the present application at least provide a noise-reducing venting riser, which is used to improve the problem in the prior art that the venting riser generates relatively loud noise when venting directly.

[0004] The embodiment of the present application provides a noise reduction type venting riser, comprising:

[0005] Riser body;

[0006] A noise reduction component, disposed in the riser body, for reducing noise during exhaust;

[0007] Wherein, the noise reduction component includes a first noise reduction unit, the first noise reduction unit includes a first rotating blade and a second rotating blade, the first rotating blade and the second rotating blade are arranged at intervals along the airflow direction, the first rotating blade and the second rotating blade are arranged to rotate relative to the circumference of the riser body after being impacted by the airflow, and the rotation directions of the first rotating blade and the second rotating blade are opposite.

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

[0009] In an optional embodiment, there are multiple first noise reduction units, and the multiple first noise reduction units are distributed at intervals along the circumference of the riser body.

[0010] In an optional embodiment, the first noise reduction unit further includes a plurality of guide plates, the plurality of guide plates are located downstream of the first rotating blade and the second rotating blade, the surfaces of the plurality of guide plates are parallel to the axial direction of the riser body, and the plurality of guide plates are distributed at intervals along the lateral direction of the riser body.

[0011] In an optional embodiment, the noise reduction component also includes a second noise reduction unit, which includes an air pipe and an air cap, the air pipe is configured to allow air to flow through the interior thereof, the cap opening of the air cap faces the air outlet end of the air pipe, and the air cap is configured to reflect sound waves for resonance sound elimination.

[0012] In an optional embodiment, the inner wall of the air cap is provided with a protrusion.

[0013] In an optional embodiment, the noise reduction component also includes a third noise reduction unit, and the third noise reduction unit includes a guide elbow and a first small hole silencer, the air outlet end of the guide elbow is located in the riser body, the first small hole silencer is arranged along the air flow direction, one end of the first small hole silencer is closed, and the other end is connected to the air outlet end of the guide elbow, and the first small hole silencer is arranged to allow air flow to flow into the interior of the riser body through the small holes on the side wall of the first small hole silencer.

[0014] In an optional embodiment, the third noise reduction unit also includes a second small hole silencer, a first baffle and a second baffle, the second small hole silencer is arranged along the air flow 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, the other end of the second small hole silencer is connected to the interior of the standpipe body, the first baffle is arranged between the first small hole silencer and the standpipe body, the second baffle is arranged between the second small hole silencer and the standpipe body, and the first baffle and the second baffle are arranged 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.

[0015] In an optional embodiment, the small holes on the side wall of the second small hole silencer and the small holes on the side wall of the first small hole silencer have different apertures.

[0016] In an optional embodiment, the noise reduction assembly also includes a fourth noise reduction unit, which includes a third small hole silencer, a third baffle and a connecting rod, the third small hole silencer is arranged along the air flow direction, the air inlet end of the third small hole silencer is circumferentially fixed to the inner wall of the standpipe body through the third baffle, and the air outlet end of the third small hole silencer is circumferentially fixed to the inner wall of the standpipe body through the connecting rod, and the third small hole silencer, the third baffle and the connecting rod are configured to allow air flow to flow through the small holes inside the third small hole silencer and on its side wall.

[0017] In an optional embodiment, the riser body includes a first pipe section and a second pipe section that are connected, the second pipe section is located downstream of the first pipe section, and the caliber of the second pipe section is larger than the caliber of the first pipe section.

[0018] The above technical solution of the present application has the following beneficial technical effects:

[0019] The noise reduction type venting riser of the embodiment of the present application, its noise reduction component includes a first noise reduction unit, the first noise reduction unit includes a first rotating blade and a second blade, after the first rotating blade and the second blade are subjected to the impact force of the airflow, the kinetic energy is converted into mechanical energy, which can reduce the flow rate of the airflow and reduce the noise during the exhaust process, thereby improving the problem of generating large noise when the venting riser is directly vented in the prior art. In addition, since the rotation directions of the first rotating blade and the second rotating blade are opposite, the rotation direction of the airflow passing through the first rotating blade and the rotation direction of the airflow passing through the second rotating blade are also different. Therefore, in addition to overcoming its own rotation resistance, the blade located downstream also needs to overcome the turning resistance of the airflow, which increases the work done by the blade located downstream, that is, the kinetic energy consumption of the airflow increases and the airflow velocity is lower.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solutions of the present application. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a noise reduction venting riser provided in an embodiment of the present application is shown;

[0023] Figure 2 A schematic diagram of the structure of the foot ring provided in an embodiment of the present application is shown;

[0024] Figure 3 A schematic diagram showing the structure of a first noise reduction unit provided in an embodiment of the present application is shown;

[0025] Figure 4 Shows Figure 1 Sectional view of AA in the middle;

[0026] Figure 5 A schematic diagram showing the structure of a second noise reduction unit provided in an embodiment of the present application is shown;

[0027] Figure 6 A schematic diagram showing the structure of a third noise reduction unit provided in an embodiment of the present application is shown;

[0028] Figure 7 A schematic diagram showing the structure of a fourth noise reduction unit provided in an embodiment of the present application is shown;

[0029] Reference numerals:

[0030] 1. Standpipe 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. Guide plate; 4. Second noise reduction unit; 41. Air pipe; 42. Air cap; 43. Conical protrusion; 5. Third noise reduction unit; 51. Guide elbow; 52. First small hole silencer; 53. Second small hole silencer; 54. First baffle; 55. Second baffle; 6. Fourth noise reduction unit; 61. Third small hole silencer; 62. Third baffle; 63. Connecting rod; 7. Sewage outlet. DETAILED DESCRIPTION

[0031] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] During the natural gas transmission process, venting risers are usually installed in natural gas transmission stations and valve rooms. The main functions of venting risers are as follows: protecting pipelines from overpressure; emergency venting in case of emergencies to reduce losses. At present, natural gas stations and valve rooms mainly adopt direct venting. This makes the venting riser generate a lot of noise when venting, which affects the surrounding environment and workers.

[0033] To this end, an embodiment of the present application provides a noise-reducing venting riser to improve the problem in the prior art that the venting riser generates relatively loud noise when venting directly.

[0034] In order to make the objectives, technical solutions and advantages of the present application more clear, they are described in detail below with reference to specific drawings and embodiments.

[0035] refer to Figure 1 and Figure 2 The noise reduction type venting riser provided in the embodiment of the present application comprises a riser body 1 and a foot ring 2. The riser body 1 is arranged vertically, and a gas inlet for inputting natural gas into the inside is arranged on the side wall of the riser body 1, and a gas outlet for discharging natural gas is arranged on the upper end of the riser body 1. The foot ring 2 is sleeved on the lower end of the outer wall of the riser body 1 and connected and fixed to the riser body 1. The foot ring 2 is used to connect to the ground through the anchor bolts 24, so as to fix the riser body 1 on the ground.

[0036] refer to Figure 1 Optionally, in the embodiment of the present application, a drain port may be provided on the side wall of the venting riser to discharge impurities in the venting riser, such as dust, rainwater, etc.

[0037] refer to Figure 2 Optionally, in the embodiment of the present application, the foot ring 2 may 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 mounted on the outer wall of the riser body 1, and there is a gap between the upper end plate 21 and the lower end plate 22. There are multiple rib plates 23, and the multiple rib plates 23 are arranged between the upper end plate 21 and the lower end plate 22 and are distributed at intervals along the circumference of the riser body 1. The foot ring 2 arranged in this way has greater strength, which is conducive to improving the stability of the empty riser.

[0038] The noise reduction type venting riser provided in the embodiment of the present application also includes a noise reduction component, which is arranged inside the riser body 1 to reduce the noise during the exhaust process. In this way, the problem of generating a large noise when the venting riser is directly vented in the prior art can be improved.

[0039] refer to Figure 1 Optionally, in an embodiment of the present application, the noise reduction component includes a first noise reduction unit 3, and the first noise reduction unit 3 can be used to consume airflow kinetic energy to reduce noise during exhaust.

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

[0041] refer to Figure 3Optionally, in the embodiment of the present application, the first noise reduction unit 3 includes a first rotating blade 31 and a second rotating blade 32, the first rotating blade 31 and the second rotating blade 32 are arranged at intervals along the airflow direction, the first rotating blade 31 and the second rotating blade 32 are arranged to rotate relative to the circumferential direction of the riser body 1 after being impacted by the airflow, and the first rotating blade 31 and the second rotating blade 32 rotate in opposite directions. During use, the first rotating blade 31 can rotate in a clockwise direction, and the second rotating blade 32 can rotate in a counterclockwise direction.

[0042] In the specific configuration, the first rotating blade 31 and the second rotating blade 32 can be installed in the riser body 1 through the rotating shaft 33, and the rotating shaft 33 is installed through the bracket 34. Figure 3 As shown. 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 rotor. Specifically, the first rotating blade 31 and the second rotating blade 32 are respectively installed in different rotors and connected and fixed with the corresponding rotors, and the rotors and the riser body 1 rotate in cooperation in the circumferential direction. When the airflow hits the first rotating blade 31 and the second rotating blade 32, the first rotating blade 31 and the second rotating blade 32 are respectively rotated by the corresponding rotors.

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

[0044] In addition, it should be noted that while the airflow rotates the first rotating blade 31 and the second rotating blade 32, it also rotates under the action of the first rotating blade 31 and the second rotating blade 32. Moreover, since the first rotating blade 31 and the second rotating blade 32 rotate in opposite directions, the rotation direction of the airflow when passing through the first rotating blade 31 and the rotation direction of the airflow when passing through the second rotating blade 32 are also different. For example, the airflow spirals forward in a clockwise direction after passing through the first rotating blade 31, and the airflow spirals forward in a counterclockwise direction after passing through the second rotating blade 32. Therefore, the blade (second blade) located downstream not only needs to overcome its own rotation resistance, but also has to overcome the turning resistance of the airflow, which increases the work done by the blade located downstream, that is, the kinetic energy consumption of the airflow increases, and the airflow velocity is lower.

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

[0046] refer to Figure 3 Optionally, in the embodiment of the present application, the first noise reduction unit 3 further includes a connecting pipe 35, and the first rotating blade 31 and the second rotating blade 32 are respectively installed at both ends of the connecting pipe 35. Specifically, the connecting pipe 35 is arranged along the airflow direction, and 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 the end of the connecting pipe 35 close to the upstream, and the second rotating blade 32 is installed at the end of the connecting pipe 35 close to the downstream. During use, due to the rotation of the airflow, noise can be generated, and the noise can be blocked by the connecting pipe 35, which can effectively reduce the noise compared to the noise directly transmitted to the outside through the riser body 1.

[0047] refer to Figure 4 Optionally, in the embodiment of the present application, the first noise reduction unit 3 includes multiple sets of blades (first rotating blades 31 and second rotating blades 32), and the multiple blades are distributed at intervals along the circumference of the riser body 1. In a specific implementation, the multiple sets of blades can be located at different radial positions of the riser body 1. In a specific setting.

[0048] refer to Figure 3 Optionally, in the embodiment of the present application, the first noise reduction unit 3 further includes 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 riser body 1, and the plurality of guide plates 36 are distributed at intervals along the lateral direction of the riser body 1. Specifically, the plurality of guide plate 36 brackets 34 form a plurality of cavities parallel to each other, which can change the direction of airflow and adjust the airflow distribution, thereby avoiding the generation of vortex aerodynamic noise caused by a large local airflow velocity pressure gradient.

[0049] refer to Figure 1 Optionally, in the embodiment of the present application, the noise reduction component further includes a second noise reduction unit 4, and the second noise reduction unit 4 is used to reduce the noise of the airflow by resonance.

[0050] In specific configuration, the second noise reduction unit 4 can be arranged upstream of the first noise reduction unit 3, or 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] refer to Figure 5Optionally, in an embodiment of the present application, the second noise reduction unit 4 includes an air pipe 41 and an air cap 42. The air pipe 41 is arranged along the air flow direction. The air pipe 41 is arranged to allow air flow to flow through the inside thereof. The cap opening of the air cap 42 faces the air outlet end of the air pipe 41. The air cap 42 is arranged to reflect sound waves for resonance silencing. Specifically, the air cap 42 has a concave cavity on the side facing the air outlet end of the air pipe 41. The air outlet end of the air pipe 41 is located in the concave cavity of the air cap 42 and is connected and fixed to the air cap 42. During use, the concave cavity of the air cap 42 can be used as an expansion chamber. When the air flow enters the expansion chamber, sound wave reflection will occur, and the reflected sound waves can produce a resonance phenomenon, thereby achieving resonance silencing.

[0052] In the specific configuration, the concave surface of the air cap 42 may be a hemispherical surface. In order to increase the number of reflections of the sound wave in the concave cavity, the concave surface of the air cap 42 may be provided with a convex structure, such as a spherical convexity, a conical convexity 43, etc. In the embodiment of the present application, the concave surface of the air cap 42 is preferably provided with a conical convexity 43.

[0053] In the specific settings,

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

[0055] refer to Figure 1 Optionally, in the embodiment of the present application, the noise reduction component further includes a third noise reduction unit 5, and the third noise reduction unit 5 is used to reduce the noise of the airflow by means of small hole silencer.

[0056] In specific configuration, the third noise reduction unit 5 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 third noise reduction unit 5 is arranged upstream of the first noise reduction unit 3, and the third noise reduction unit 5 is connected to the air inlet end of the riser body 1.

[0057] refer to Figure 1 and Figure 6Optionally, in the embodiment of the present application, the third noise reduction unit 5 includes a flow guide elbow 51 and a first small hole silencer 52, the outlet end of the flow guide elbow 51 is located in the riser body 1, the first small hole silencer 52 is arranged along the air flow direction, one end of the first small hole silencer 52 is closed, and the other end is connected to the outlet end of the flow guide elbow 51, and the first small hole silencer 52 is arranged to allow the air flow to flow into the riser body 1 through the small hole on the side wall of the first small hole silencer 52. Specifically, the end of the first small hole silencer 52 away from the flow guide elbow 51 is closed, so that the air flow in the first small hole silencer 52 needs to pass through the small hole on the side wall of the first small hole silencer 52 to flow to the downstream of the riser body 1. During use, the air flow can be ejected from the small hole on the side wall of the first small hole silencer 52, and due to different impedance cross sections, part of the sound wave is returned to the sound source. At the same time, when the air flow passes through the small hole, its flow velocity is dispersed, thereby reducing the air flow velocity and reducing the sound power. Furthermore, during the above process, the airflow is turned, which can also reduce the airflow speed.

[0058] In specific configuration, the aperture of the small holes on the side wall of the first small hole silencer 52 is 3-5 mm, and the total area of ​​the small holes is 1.5-3.0 times the flow cross section of the first small hole silencer 52. In addition, the small holes can be arranged in a regular matrix or in an irregular arrangement.

[0059] refer to Figure 1 and Figure 6Optionally, in the embodiment of the present application, the third noise reduction unit 5 also includes a second small hole silencer 53, a first baffle 54 and a second baffle 55. The second small hole silencer 53 is arranged along the air flow direction and is located downstream of the first small hole silencer 52. One end of the second small hole silencer 53 is closed and connected to the first small hole silencer 52. The other end of the second small hole silencer 53 is connected to the interior of the standpipe body 1. The first baffle 54 is arranged between the first small hole silencer 52 and the standpipe body 1. The second baffle 55 is arranged between the second small hole silencer 53 and the standpipe body 1. The first baffle 54 and the second baffle 55 are arranged to allow airflow to flow into the interior of the second small hole silencer 53 through the small holes on the side wall of the second small hole silencer 53. Specifically, the first baffle 54 and the second baffle 55 are used to achieve structural sealing, so that an annular cavity is formed between the first baffle 54, the second baffle 55, the riser body 1, the first small hole silencer 52 and the second small hole silencer 53. One end of the annular cavity is connected to the first small hole silencer 52, and the other end is connected to the second small hole silencer 53. Therefore, after the airflow is ejected from the small hole on the side wall of the first small hole silencer 52, it needs to flow into the second small hole silencer 53 through the small hole on the side wall of the second small hole silencer 53 to flow downstream. During use, because the airflow passes through the small hole on the side wall of the second small hole silencer 53, based on the same principle, the flow velocity of the airflow is dispersed when passing through the small hole, thereby reducing the airflow velocity and reducing the sound power. Moreover, in the above process, the airflow turns, which can also play a role in reducing the airflow velocity. In addition, when the airflow flows into the riser body 1 from the second small hole silencer 53, as the flow cross section increases, it can also play a role in reducing the airflow velocity.

[0060] In a specific configuration, the first baffle plate 54 and the first small hole silencer 52 may be an integrated structure, so that the connection strength between the first baffle plate 54 and the first small hole silencer 52 can be improved.

[0061] In a specific configuration, the second baffle plate 55 and the second small hole silencer 53 may be an integrated structure, so that the connection strength between the second baffle plate 55 and the second small hole silencer 53 can be improved.

[0062] In the specific configuration, the apertures of the small holes on the side wall of the second small hole silencer 53 are different from the apertures of the small holes on the side wall of the first small hole silencer 52. For example, the aperture of the small holes on the side wall of the second small hole silencer 53 is 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 silencer 53. In addition, the small holes can be arranged in a regular matrix or in an irregular arrangement.

[0063] refer to Figure 1 Optionally, in the embodiment of the present application, the noise reduction component further includes a fourth noise reduction unit 6, and the fourth noise reduction unit 6 is used to reduce the noise of the airflow by means of small hole silencer.

[0064] In specific configuration, 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 is located at the air outlet end of the riser body 1.

[0065] refer to Figure 1 and Figure 7 Optionally, in the embodiment of the present application, the fourth noise reduction unit 6 includes a third small hole silencer 61, a third baffle 62 and a connecting rod 63. The third small hole silencer 61 is arranged along the airflow direction. The air inlet end of the third small hole silencer 61 is circumferentially fixed to the inner wall of the riser body 1 through the third baffle 62. The air outlet end of the third small hole silencer 61 is circumferentially fixed to the inner wall of the riser body 1 through the connecting rod 63. The third small hole silencer 61, the third baffle 62 and the connecting rod 63 are arranged to allow the airflow to flow through the small holes inside the third small hole silencer 61 and on its side wall. Specifically, the third baffle 62 is used to achieve sealing between the structures, so that the upstream airflow needs to flow to the downstream through the small holes inside the third small hole silencer 61 and on the side wall of the third small hole silencer 61. During use, the airflow can be ejected from the small holes on the side wall of the third small hole silencer 61. Due to different impedance cross sections, part of the sound waves are returned to the sound source. At the same time, when the airflow passes through the small hole, its flow velocity is dispersed, thereby reducing the airflow velocity and reducing the sound power. In addition, in the above process, the airflow turns, which can also play a role in reducing the airflow velocity.

[0066] In a specific configuration, the third small hole silencer 61, the third baffle 62 and the connecting rod 63 may be an integrated structure, which can improve the connection strength between the components.

[0067] In the specific configuration, the apertures of the small holes on the side wall of the third small hole silencer 61 are different from the apertures of the small holes on the side wall of the first small hole silencer 52 and the apertures of the small holes on the side wall of the second small hole silencer 53. For example, the aperture of the small holes on the side wall of the third small hole silencer 61 is 1-2 mm. In addition, the arrangement of the small holes can be a regular matrix or an irregular arrangement.

[0068] Optionally, in the embodiment of the present application, the riser body 1 includes a first pipe section 11 and a second pipe section 12 which are connected to each other, the second pipe section 12 is located downstream of the first pipe section 11, and the diameter of the second pipe section 12 is larger than the diameter 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 noise.

[0069] In specific configuration, at least one noise reduction unit may be provided in each of the first pipe section 11 and the second pipe section 12. 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 this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this application.

[0071] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A noise reduction venting riser, characterized in that: include: Riser body; A noise reduction component, disposed in the riser body, for reducing noise during exhaust; Wherein, the noise reduction component includes a first noise reduction unit, the first noise reduction unit includes a first rotating blade and a second rotating blade, the first rotating blade and the second rotating blade are arranged at intervals along the airflow direction, the first rotating blade and the second rotating blade are arranged to rotate relative to the circumference of the riser body after being impacted by the airflow, and the rotation directions of the first rotating blade and the second rotating blade are opposite.

2. The noise reduction venting riser according to claim 1, characterized in that: The first noise reduction unit further includes a connecting pipe, and the first rotating blade and the second rotating blade are respectively installed in both ends of the connecting pipe.

3. The noise reduction venting riser according to claim 1, characterized in that: The first noise reduction unit further includes a plurality of guide plates, which are located downstream of the first rotating blade and the second rotating blade, have surfaces parallel to the axial direction of the riser body, and are distributed at intervals along the lateral direction of the riser body.

4. The noise reduction venting riser according to claim 1, characterized in that: The noise reduction component also includes a second noise reduction unit, which includes an air pipe and an air cap. The air pipe is configured to allow air to flow through its interior, the cap opening of the air cap faces the air outlet end of the air pipe, and the air cap is configured to reflect sound waves for resonance sound elimination.

5. The noise reduction venting riser according to claim 4, characterized in that: The inner wall of the air cap is provided with a protrusion.

6. The noise reduction venting riser according to claim 1, characterized in that: The noise reduction assembly also includes a third noise reduction unit, which includes a guide elbow and a first small hole silencer. The air outlet end of the guide elbow is located in the riser body. The first small hole silencer is arranged along the air flow direction. One end of the first small hole silencer is closed, and the other end is connected to the air outlet end of the guide elbow. The first small hole silencer is arranged to allow air flow to flow into the interior of the riser body through the small holes on the side wall of the first small hole silencer.

7. The noise reduction venting riser according to claim 6, characterized in that: The third noise reduction unit also includes a second small hole silencer, a first baffle and a second baffle. The second small hole silencer is arranged along the air flow 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 standpipe body. The first baffle is arranged between the first small hole silencer and the standpipe body, and the second baffle is arranged between the second small hole silencer and the standpipe body. The first baffle and the second baffle are arranged 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.

8. The noise reduction venting riser according to claim 7, characterized in that: The apertures of the small holes on the side wall of the second small hole silencer are different from the apertures of the small holes on the side wall of the first small hole silencer.

9. The noise reduction venting riser according to claim 1, characterized in that: The noise reduction assembly also includes a fourth noise reduction unit, which includes a third small hole silencer, a third baffle and a connecting rod. The third small hole silencer is arranged along the air flow direction, the air inlet end of the third small hole silencer is circumferentially fixed to the inner wall of the standpipe body through the third baffle, and the air outlet end of the third small hole silencer is circumferentially fixed to the inner wall of the standpipe body through the connecting rod. The third small hole silencer, the third baffle and the connecting rod are arranged to allow air flow to flow through the small holes inside the third small hole silencer and on its side wall.

10. The noise reduction venting riser according to claim 9, characterized in that: The riser body comprises a first pipe section and a second pipe section which 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 that of the first pipe section.

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