A perforated tube muffler

Abstract

The application discloses a perforated pipe muffler and relates to the technical field of muffling equipment, which solves the problem that the existing throttling noise reduction muffler cannot meet the noise reduction demand of a nuclear power atmospheric release valve, improves the noise reduction effect and medium processing capacity, and specifically has the following arrangement: a shell with a plurality of small holes arranged on an inner wall, a first chamber, a second chamber and a third chamber sequentially arranged in the shell along the length direction of the shell, a first partition plate with small holes arranged between the first chamber and the second chamber, a second partition plate arranged between the second chamber and the third chamber, an inlet nozzle with small holes arranged on the pipe body and connected to the outside through the first chamber, a plurality of first perforated pipes arranged between the first chamber and the third chamber, a plurality of small holes arranged on the pipe body of each first perforated pipe and located in the second chamber, a second perforated pipe arranged between the second chamber and the third chamber, and a spiral structure arranged in the third chamber and used for guiding the medium.

Description

Technical Field

[0001] This invention relates to the field of silencer technology, and in particular to a perforated tube silencer. Background Technology

[0002] Nuclear power plants are equipped with atmospheric release valves in their steam circuits. Under certain operating conditions, these valves are used to release steam into the atmosphere to cool the plant. Because the steam is under high temperature and pressure and the discharge volume is large, the atmospheric release valve generates a lot of noise during the discharge process. In order to protect the health of power plant personnel and the surrounding ecological environment, silencers need to be installed at the atmospheric release valve outlet to limit the noise to the required range.

[0003] The noise reduction mechanisms of silencers are diverse, such as resistive silencer, reactive silencer, impedance composite silencer, diffusion silencer, micro-perforated silencer, small hole silencer, and active silencer. Among them, small hole silencer (i.e., throttling noise reduction) is the most widely used.

[0004] The inventors discovered that existing throttling noise reduction mufflers are mostly used in low-workload scenarios such as engine noise reduction, with low working pressure and simple overall structure. They achieve noise reduction through graded throttling and the use of sound-absorbing materials. However, the emission capacity of nuclear power plant atmospheric release valves is over 300t / h, and existing throttling noise reduction mufflers cannot meet the noise reduction requirements of nuclear power plant atmospheric release valves. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a perforated tube silencer in which the first, second, and third chambers are interconnected to achieve non-staged silencing, greatly increasing the amount of steam allowed to pass through for noise reduction. At the same time, it utilizes diffusion, throttling, and resonance principles for noise reduction, significantly improving the noise reduction effect and solving the problem that existing throttling noise reduction silencers cannot meet the noise reduction requirements of nuclear power plant atmospheric release valves.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, the present invention provides a perforated tube type silencer, comprising a shell with a plurality of small holes on its inner wall, the interior of the shell being sequentially divided into a first chamber, a second chamber and a third chamber along its length, a first partition with small holes being provided between the first chamber and the second chamber, a second partition being provided between the second chamber and the third chamber, the first chamber being connected to the outside through an inlet nozzle with small holes in its tube body, the first chamber and the third chamber being connected through a plurality of first perforated tubes, the first perforated tubes located in the second chamber having a plurality of small holes evenly distributed on their tube bodies, the third chamber being connected to the second chamber through a second perforated tube, and the third chamber having a spiral structure for guiding the medium.

[0008] As a further implementation, the shell consists of an outer cylinder and an inner cylinder fixedly disposed inside the outer cylinder. The inner cylinder is provided with several small holes evenly distributed on it. There is a gap between the inner cylinder and the outer cylinder. The first partition and the second partition penetrate the inner cylinder and are fixedly connected to the outer cylinder. The portion of the first partition located inside the inner cylinder is provided with several small holes evenly distributed on it.

[0009] As a further implementation, the inlet nozzle has openings at both ends, is coaxially arranged with the housing, and has several small holes evenly distributed on the tube body located in the first chamber.

[0010] As a further implementation, the first perforated pipe is horizontally arranged between the first partition and the second partition, and a plurality of first perforated pipes are arranged circumferentially along the first partition and the second partition, with the axis of the inlet nozzle coinciding with the axis of the circle enclosed by the plurality of first perforated pipes.

[0011] As a further implementation, the diameter of the first partition is the same as that of the small hole on the first perforated tube.

[0012] As a further implementation, a third partition with several small holes is fixedly provided in the third chamber. The third chamber is divided into a first part and a second part by the third partition. One end of the second perforated tube passes through the second partition and communicates with the second chamber, while the other end is located in the third chamber and passes through the third partition.

[0013] As a further implementation, the second perforated tube is coaxially arranged with the circle formed by the plurality of first perforated tubes, the outer diameter of the second perforated tube is smaller than the diameter of the circle formed by the plurality of first perforated tubes, and the tube body of the second perforated tube located in the first part is uniformly provided with a plurality of first small holes.

[0014] As a further implementation, a spiral structure is fixedly installed inside the second part. The spiral structure is a first guide plate arranged in a spiral shape, and the first guide plate is fixedly installed outside the second perforated tube.

[0015] As a further implementation, the second perforated tube is provided with a plurality of second small holes arranged spirally along the axial direction of the second perforated tube on the tube body located in the second part, and the second small holes are located in the spiral space enclosed by the first guide plate.

[0016] As a further implementation, the air outlet end of the housing is fixedly provided with a second guide plate in the shape of a trumpet.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The first chamber, the second chamber, and the third chamber of this invention are interconnected to achieve non-gradual silencing, which greatly increases the amount of steam allowed to pass through the silencer for noise reduction. At the same time, noise reduction is achieved by using diffusion, throttling and resonance principles, which greatly improves the noise reduction effect.

[0019] (2) The inlet nozzle of the present invention has several small holes evenly opened on the pipe body in the first chamber, which can be used for throttling and pressure reduction and guiding steam into the first chamber, thereby utilizing the space of the first chamber to reduce pressure and temperature. At the same time, small holes are opened on the inner cylinder, which can reduce noise through the principle of resonance.

[0020] (3) In this invention, steam enters the second chamber through the first partition to achieve secondary pressure and temperature reduction of steam by utilizing the space of the second chamber. The first perforated pipe is located in the second chamber and has several small holes evenly opened on its body. The steam ejected from the first perforated pipe interacts with the steam entering the second chamber through the first partition to reduce noise by utilizing the principles of diffusion, active interference and resonance. At the same time, the inner cylinder plays a role in resonance-assisted noise reduction.

[0021] (4) The diameter of the small hole on the first partition and the first perforated pipe of the present invention is the same, so that the pressure and velocity of the two parts of steam entering the second chamber are the same, and the noise reduction effect is guaranteed by the principle of active interference.

[0022] (5) The second perforated tube of the present invention is coaxially arranged with the circle formed by the first perforated tubes. The outer diameter of the second perforated tube is smaller than the diameter of the circle formed by the first perforated tubes. The steam flowing out through the first perforated tube will be evenly dispersed around the second perforated tube. The steam sprayed out by the second perforated tube part located inside the first part will interact with the steam around it. In conjunction with the inner cylinder, noise reduction is achieved by using the principles of diffusion, active interference and resonance, which greatly improves the noise reduction effect.

[0023] (6) The first guide plate of the present invention is spirally arranged to guide the steam and increase the flow path. The second small hole is located in the spiral space enclosed by the first guide plate. The steam enters the spiral space through the second small hole and interacts with the steam in the spiral space. In conjunction with the inner cylinder, the steam is reduced by using the principles of diffusion, active interference and resonance to improve the noise reduction effect. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 This is a cross-sectional structural diagram of a perforated tube silencer according to one or more embodiments of the present invention;

[0026] In the diagram: the spacing or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only.

[0027] Among them, 1. Inlet nozzle; 2. First chamber; 3. First baffle; 4. First perforated pipe; 5. Second chamber; 6. Second baffle; 7. Second perforated pipe; 8. Third chamber; 9. Third baffle; 10. First guide plate; 11. Outer cylinder; 12. Inner cylinder; 13. Second guide plate. Detailed Implementation

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] As introduced in the background section, existing throttling noise reduction mufflers are mostly used in low-workload scenarios such as engine noise reduction, with low operating pressure and simple overall structure. Noise reduction can be achieved through staged throttling and the use of sound-absorbing materials. However, the emission capacity of nuclear power plant atmospheric release valves is over 300t / h, and existing throttling noise reduction mufflers cannot meet the noise reduction requirements of nuclear power plant atmospheric release valves. In order to solve the above technical problems, this invention proposes a perforated tube type muffler.

[0030] Example 1

[0031] In a typical embodiment of the present invention, such as Figure 1 As shown, a perforated tube type silencer is proposed, including an outer cylinder 11 and an inner cylinder 12. The inner cylinder 12 is fixedly installed inside the outer cylinder 11 to form the shell of the silencer. A number of small holes are evenly provided on the inner wall of the shell along its circumferential and axial directions. One end of the shell is the air inlet end, which is provided with an inlet nozzle 1, and the other end is the air outlet end.

[0032] The interior of the shell is divided into a first chamber 2, a second chamber 5 and a third chamber 8 along its length by a partition to reduce the noise of steam.

[0033] The inner cylinder 12 has several small holes evenly distributed on it to resonate with the steam and help reduce noise. There is a gap between the inner cylinder 12 and the outer cylinder 11. The partition passes through the inner cylinder 12 and is fixedly connected to the inner wall of the outer cylinder 11.

[0034] The inlet nozzle 1 is a tubular structure with open ends. The inlet nozzle 1 is located at the center of one end of the shell (i.e., the inlet nozzle 1 is coaxial with the shell). One end of the inlet nozzle 1 extends into the first chamber 2, and the other end extends out of the shell to guide steam into the first chamber 2, thereby utilizing the space of the first chamber 2 to reduce pressure and temperature. The inlet nozzle 1 located in the first chamber has several small holes evenly arranged along its axial and circumferential directions for injecting steam. The diameter of the small holes is 10-15mm, so as to reduce noise through the principle of throttling diffusion.

[0035] In the first chamber 2, the steam is first ejected outward through the small holes on the inlet nozzle 1 to reduce noise by utilizing the principle of throttling and diffusion. The ejected steam resonates with the small holes on the part of the inner cylinder 12 located in the first chamber 2 to further reduce noise.

[0036] A first partition 3 is provided between the first chamber 2 and the second chamber 5. The portion of the first partition 3 located between the inner cylinder 12 and the outer cylinder 11 does not have small holes. The portion located inside the inner cylinder 12 has several small holes with a diameter of 8-10 mm evenly provided to allow steam to pass through the first partition 3 and enter the second chamber 5, thereby achieving throttling and noise reduction. At the same time, the space of the second chamber 5 is used to achieve secondary pressure and temperature reduction of the steam.

[0037] A second partition 6 is provided between the second chamber 5 and the third chamber 8. The second partition 6 does not have small holes to block steam. The second partition 6 also passes through the inner wall of the inner cylinder 12 and the outer cylinder 11 and is fixedly connected to prevent steam in the gap between the outer cylinder 11 and the inner cylinder 12 from flowing into the adjacent chamber.

[0038] Similarly, the steam that passes through the first partition 3 from the first chamber 2 into the second chamber 5 will resonate with the inner cylinder 12 located in the second chamber 5 to achieve noise reduction.

[0039] The second chamber 5 is provided with a plurality of first perforated pipes 4 for connecting the first chamber 2 and the third chamber 8. Specifically, one end of the first perforated pipe 4 passes through the first partition 3 and connects to the first chamber 2, and the other end of the first perforated pipe 4 passes through the second partition 6 and connects to the third chamber 8.

[0040] The first perforated tube 4 is horizontally arranged between the first partition 3 and the second partition 6. Several first perforated tubes 4 are arranged circumferentially along the first partition 3 and the second partition 6. The tube body of the first perforated tube 4 located inside the second chamber 5 is uniformly provided with several small holes of 8-10mm along its axial and circumferential directions.

[0041] Part of the steam in the first chamber 2 passes through the first partition 3 into the second chamber 5, and another part enters the first perforated pipe 4. Part of the steam in the first perforated pipe 4 flows into the third chamber 8 through the guide of the first perforated pipe 4, and part of it is injected into the second chamber 5 through the small holes on the pipe body of the first perforated pipe 4. The steam injected from the first perforated pipe 4 interacts with the steam that passes through the first partition 3 into the second chamber 5, so as to use the principles of diffusion, active interference and resonance to reduce noise.

[0042] The diameter of the small holes on the first partition 3 and the first perforated pipe 4 is the same, so that the pressure and velocity of the two parts of steam entering the second chamber 5 are the same, and the noise reduction effect is guaranteed by the principle of active interference.

[0043] The axis of the inlet nozzle 1 coincides with the axis of the first baffle 3 and the second baffle 6. Alternatively, the axis of the inlet nozzle 1 coincides with the axis of the circle enclosed by the first perforated pipes 4. The outer diameter of the inlet nozzle 1 is smaller than the diameter of the circle enclosed by the first perforated pipes 4, so as to ensure that steam can enter all the first perforated pipes 4 evenly.

[0044] A third partition 9 is fixedly installed in the middle of the third chamber 8. The third partition 9 divides the third chamber 8 into two parts, namely the first part and the second part. The first part is located between the second partition 6 and the third partition 9.

[0045] The third chamber 8 is also provided with a horizontally arranged second perforated pipe 7. The second perforated pipe 7 is used to connect the second chamber 5 and the third chamber 8. Specifically, one end of the second perforated pipe 7 passes through the second partition 6 and connects with the second chamber 5, and the other end is located in the third chamber 8 and passes through the third partition 9. The steam in the second chamber 5 can enter the third chamber 8 through the second perforated pipe 7.

[0046] The second perforated pipe 7 is located inside the first part. Several small holes of 3-5mm are evenly provided on its circumferential and axial directions to perform small hole injection frequency shift noise reduction. The steam in the second perforated pipe 7 can enter the first part through the small holes on its pipe body. The steam entering the first part will also react with the small holes on the inner cylinder 12 in the first part to reduce noise by using the diffusion principle and resonance principle.

[0047] The second perforated pipe 7 is coaxially arranged with the inlet nozzle 1, that is, the second perforated pipe 7 is also coaxially arranged with the circle formed by the first perforated pipes 4. The outer diameter of the second perforated pipe 7 is smaller than the diameter of the circle formed by the first perforated pipes 4. It can also be understood that the first perforated pipes 4 are located outside the second perforated pipe 7 and are arranged at intervals along the circumference of the second perforated pipe 7. Thus, the steam flowing out through the first perforated pipes 4 will be evenly dispersed around the second perforated pipe 7. The steam ejected from the second perforated pipe 7 located inside the first part will interact with the steam around it, so as to use the principles of diffusion, active interference and resonance to reduce noise.

[0048] The portion of the third baffle 9 located between the inner cylinder 12 and the outer cylinder 11 does not have small holes. The portion located inside the inner cylinder 12 has several small holes with a diameter of 3-5 mm that are evenly distributed to allow steam in the first part to pass through the third baffle 9 into the second part for frequency shifting and noise reduction of the small hole injection.

[0049] A first guide plate 10 is fixedly installed in the second part of the third chamber 8. The first guide plate 10 is fixedly installed outside the second perforated pipe 7. The first guide plate 10 is spirally arranged along the axial direction of the second perforated pipe 7 to guide the steam and increase the flow path. The steam in the first part enters the second part after passing through the third partition 9, and flows to the outlet end and is discharged under the guidance of the first guide plate 10.

[0050] The second perforated tube 7 located inside the second part also has several small holes. For easy distinction, the small holes of the second perforated tube 7 located inside the first part are called the first small holes, and the small holes of the second perforated tube 7 located inside the second part are called the second small holes. The second small holes are arranged spirally along the axial direction of the second perforated tube 7, and the spiral direction is the same as that of the first guide plate 7. The second small holes are located within the spiral space enclosed by the first guide plate 10.

[0051] No small holes are opened on the first guide plate 10. The steam in the first part enters the spiral space after passing through the third partition 9. The steam flows spirally under the guidance of the first guide plate 10. At the same time, the steam in the second chamber 5 enters the second perforated pipe 7. Part of it enters the first part through the first small hole for noise reduction and sound attenuation, and the other part enters the spiral space through the second small hole, thereby interacting with the steam in the spiral space and using the principles of diffusion, active interference and resonance to reduce noise.

[0052] The outlet end of the housing is fixedly provided with a second guide plate 13, which is funnel-shaped and used to discharge steam into the atmosphere to achieve noise reduction requirements.

[0053] In this embodiment, non-graded silencing is adopted, which greatly increases the amount of steam that can pass through the silencer for noise reduction. The overall resistance is small, the noise reduction effect is obvious, and the silencer is made of stainless steel. It is suitable for noise reduction of high temperature and high pressure steam medium and has low maintenance cost.

[0054] It should be noted that the holes described in this embodiment are all through holes, that is, they penetrate the corresponding structural walls.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A perforated tube type silencer, characterized in that, The device includes a shell with several small holes on its inner wall. The interior of the shell is divided into a first chamber, a second chamber, and a third chamber along its length. A first partition with small holes is provided between the first chamber and the second chamber. A second partition is provided between the second chamber and the third chamber. The first chamber is connected to the outside through an inlet nozzle with small holes in its tube. The first chamber and the third chamber are connected through several first perforated tubes. Several small holes are evenly provided on the tube of the first perforated tube located in the second chamber. The third chamber is connected to the second chamber through a second perforated tube. A spiral structure for guiding the medium is provided in the third chamber. The first perforated pipe is horizontally arranged between the first partition and the second partition, and a plurality of first perforated pipes are arranged circumferentially along the first partition and the second partition. The axis of the inlet nozzle coincides with the axis of the circle enclosed by the plurality of first perforated pipes. The third chamber is fixedly provided with a third partition plate with several small holes. The third chamber is divided into a first part and a second part by the third partition plate. One end of the second perforated tube passes through the second partition plate and communicates with the second chamber, and the other end is located in the third chamber and passes through the third partition plate. The second perforated tube is coaxially arranged with the circle formed by the first perforated tubes. The outer diameter of the second perforated tube is smaller than the diameter of the circle formed by the first perforated tubes. The second perforated tube is provided with a number of first small holes evenly distributed on its tube body within the first part.

2. The perforated tube silencer according to claim 1, characterized in that, The shell consists of an outer cylinder and an inner cylinder fixedly disposed inside the outer cylinder. The inner cylinder is provided with several small holes evenly distributed on it. There is a gap between the inner cylinder and the outer cylinder. The first partition and the second partition penetrate the inner cylinder and are fixedly connected to the outer cylinder. The portion of the first partition located inside the inner cylinder is provided with several small holes evenly distributed on it.

3. A perforated tube silencer according to claim 1, characterized in that, The inlet nozzle is open at both ends and is coaxially arranged with the housing. Several small holes are evenly distributed on the tube body of the inlet nozzle located in the first chamber.

4. A perforated tube silencer according to claim 1, characterized in that, The diameter of the first partition is the same as the diameter of the small hole on the first perforated tube.

5. A perforated tube silencer according to claim 1, characterized in that, The spiral structure is fixedly installed inside the second part. The spiral structure is a first guide plate arranged in a spiral shape. The first guide plate is fixedly installed outside the second perforated tube.

6. A perforated tube silencer according to claim 5, characterized in that, The second perforated tube is provided with several second small holes arranged spirally along the axis of the second perforated tube within the second part of the tube body, and the second small holes are located within the spiral space enclosed by the first guide plate.

7. A perforated tube silencer according to claim 1, characterized in that, The air outlet end of the housing is fixedly provided with a second guide plate in the shape of a trumpet.

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