A multi-stage noise reduction silencer for steam boiler air discharge

Abstract

The utility model discloses a multistage noise reduction's silencer for steam boiler empty discharge, including shell and bottom cover, the outside of shell is provided with bottom cover, the bottom of bottom cover installs the expansion cover, the bottom of expansion cover installs the delivery pipeline, the bottom of delivery pipeline installs the flange, the outside of flange is provided with top cover, the top of top cover installs the support frame, the lateral wall of shell is installed with the equal interval multiple group first U -shaped frame, the lateral wall of bottom cover, top cover all installs the equal interval multiple group second U -shaped frame. The utility model not only realized silencer convenient multistage noise reduction and discharged, reduced the influence to person and environment, improved the efficiency that silencer multistage noise reduction and discharged, and realized silencer convenient and closed, avoided the dust of outside to fall to inside, improved the use effect of silencer.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically a multi-stage noise reduction silencer for steam boiler air discharge. Background Technology

[0002] Steam boilers can be classified into manually operated steam boilers and fully automatic chain grate steam boilers according to their fuel supply method; and into vertical steam boilers and horizontal steam boilers according to their structure. Small steam boilers are mostly single- or double-pass vertical structures, while large steam boilers are mostly three-pass horizontal structures. Vertical oil and gas steam boilers adopt a bottom-mounted burner and a two-pass structure, which ensures complete fuel combustion and stable boiler operation. The flue tubes are equipped with baffles to slow down the exhaust gas speed, increase heat exchange, and improve boiler thermal efficiency, thereby reducing user operating costs.

[0003] For example, the high-temperature and high-pressure steam silencer disclosed in the authorization announcement number CN210319031U includes a cylindrical shell, an air outlet at the top of the shell, an air inlet at the bottom of the shell, a baffle plate inside the shell, a plurality of through holes evenly opened on the baffle plate, and a noise reduction tube vertically welded to each of the through holes on the upper surface of the baffle plate. The noise reduction tube is a tube with an open bottom, and noise reduction holes are opened on the tube wall of the noise reduction tube. Although it achieves noise reduction by combining resistance, obstruction, and jetting, and is based on the small-hole injection theory combined with impedance expansion and sound absorption, after installing the new silencer, the noise reduction can be reduced to 40 decibels at night, so as to meet the requirements of the <<Industrial Enterprise Noise Standard>>. However, this does not solve the problem that existing silencers of this type generally do not facilitate convenient multi-stage noise reduction during use, increasing the impact on people and the environment. They are also inconvenient to disassemble and maintain, and do not allow for easy rotation and closure of the silencer. External dust may fall into the interior, affecting the silencer's performance. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-stage noise reduction silencer for steam boiler air discharge, so as to solve the problems mentioned in the background art, such as the silencer not being convenient for multi-stage noise reduction, which increases the impact on people and the environment, is not convenient for disassembly and maintenance, is not convenient for convenient rotation and closure of the silencer, and external dust may fall into the interior, affecting the use effect of the silencer.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage noise reduction silencer for steam boiler air discharge, comprising a shell and a bottom cover. The bottom cover is provided on the outside of the shell, an expansion hood is installed at the bottom end of the bottom cover, a conveying pipe is installed at the bottom end of the expansion hood, a flange is installed at the bottom end of the conveying pipe, a top cover is provided on the outside of the flange, a support frame is installed at the top of the top cover, multiple sets of first U-shaped frames are symmetrically installed at equal intervals on the side walls of the shell, and multiple sets of second U-shaped frames are installed at equal intervals on the side walls of both the bottom cover and the top cover. The frame consists of a first U-shaped frame with a rotating shaft movably mounted inside, and threaded rods fitted onto the surface of each rotating shaft. The second U-shaped frame has a C-shaped plate on its exterior, and a threaded sleeve on the exterior of each C-shaped plate. The threaded rods extend through the C-shaped plates to their exterior and are threadedly connected to the threaded sleeves. A sound-absorbing plate is installed on the inner wall of the outer shell, and an inner tube is installed on the inner wall of the sound-absorbing plate. A support frame is installed outside the inner tube, extending into the interior of the inner tube. Multiple sets of perforated tubes at equal intervals are installed inside the support frame.

[0006] Preferably, support columns are symmetrically installed at the top of the support frame, and end plates are installed at the top of the support columns.

[0007] Preferably, the end plate has multiple sets of through holes with equal spacing inside, and the bottom cover has a groove inside.

[0008] Preferably, a support plate is installed on the side wall of the support frame, and a servo motor is installed on the side wall of the support plate.

[0009] Preferably, the support frame is provided with four sets of louvers at equal intervals on its exterior, and a rotating shaft is installed on both sides of each louver.

[0010] Preferably, all the rotating shafts extend through the support frame to its outside, and the output end of the servo motor is connected to a set of rotating shafts.

[0011] Preferably, the surface of the rotating shaft is fitted with a rocker arm, and a support shaft is movably mounted on the side of the rocker arm away from the rotating shaft.

[0012] Preferably, the support frame is provided with a cross arm on its exterior, and all support shafts are movably connected to the cross arm.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the silencer not only realizes convenient multi-stage noise reduction for exhaust, reducing the impact on people and the environment, and facilitating disassembly and maintenance, but also realizes convenient rotation and closure of the silencer, preventing external dust from falling into the interior, thus improving the silencer's performance. When using a multi-stage noise reduction silencer for steam boiler exhaust, the flange is connected to the external steam equipment. Steam enters the expansion chamber through the flange and delivery pipe. The expansion chamber is a chamber much larger than the diameter of the delivery pipe. Upon entry, the steam suddenly expands, its velocity drops sharply, and its pressure decreases accordingly. The steam then passes through multiple sets of perforated pipes for separation and diversion. These perforated pipes divide the large airflow into multiple smaller airflows, effectively disrupting large-scale turbulence and preparing for high-frequency noise reduction. This primarily utilizes the principle of acoustic impedance; through abrupt changes in the pipe cross-section, sound waves are reflected and interfered during propagation, thus consuming sound energy. This method is effective for mid-to-low frequency noise. After the steam exits the perforated pipes, when sound waves pass through the sound-absorbing plate, they cause friction and vibration of air molecules and fibers, converting sound energy into heat energy, which is then dissipated. This system uses sound-absorbing panels to reduce sound waves. Steam continues to pass through the end plate, which has multiple sets of through holes on its surface. These through holes can shift noise energy from the low-to-mid frequency range that the human ear is sensitive to to the high frequency range. High-frequency noise attenuates faster in the atmosphere. Because the total flow area of ​​the through holes is larger than the area of ​​the conveying pipe, the steam outlet velocity is further reduced, allowing the steam to be discharged through the multiple sets of louvers on the surface of the support frame. When disassembly is required, multiple sets of threaded sleeves are turned to disengage the threaded sleeves from the threaded rods, allowing the C-shaped plate to be removed. The bottom cover and top cover can then be removed. Since the support frame is placed on top of the bottom cover, it falls off when the bottom cover is removed, making it easy to clean the support frame, perforated pipe, and end plate. This system enables convenient multi-stage noise reduction of the silencer, reducing the impact on people and the environment, and facilitating disassembly and maintenance. A servo motor drives a set of rotating shafts to rotate, which in turn drives a set of louvers to rotate. This rotating shaft then drives a set of rocker arms to rotate, which in turn drives a horizontal arm to rotate via a set of support shafts. The horizontal arm then drives the remaining support shafts, rocker arms, and rotating shafts to rotate around their respective pivots. These rotating shafts, in turn, drive the remaining sets of louvers to rotate and close, thus preventing external dust from falling into the muffler. This allows for convenient rotation and closure of the muffler, preventing external dust from entering and improving its performance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view structural diagram of the present utility model; Figure 3 This is a three-dimensional structural diagram of the expansion cover of this utility model; Figure 4 This is a three-dimensional structural diagram of the threaded sleeve of this utility model; Figure 5 This is a front view cross-sectional structural diagram of the outer shell of this utility model; Figure 6 This is a three-dimensional structural diagram of the support frame of this utility model; Figure 7 This is a three-dimensional structural diagram of the bottom cover of this utility model; Figure 8 This is a three-dimensional structural diagram of the support frame of this utility model; Figure 9 This is a three-dimensional structural diagram of the cross arm of this utility model; Figure 10 This is a three-dimensional structural diagram of the perforated tube of this utility model; Figure 11 This is a three-dimensional structural diagram of the inner tube of this utility model.

[0015] In the diagram: 1. Outer shell; 2. Bottom cover; 3. Expansion cover; 4. Conveying pipe; 5. Flange; 6. Top cover; 7. Support frame; 8. First U-shaped frame; 9. Second U-shaped frame; 10. Rotating shaft; 11. Threaded rod; 12. Threaded sleeve; 13. C-shaped plate; 14. Sound-absorbing plate; 15. Inner tube; 16. Support frame; 17. Perforated pipe; 18. Support column; 19. End plate; 20. Groove; 21. Support plate; 22. Servo motor; 23. Louver; 24. Rotating shaft; 25. Rocker arm; 26. Support shaft; 27. Cross arm; 28. Through hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Please see Figure 1-11This utility model provides an embodiment of a multi-stage noise reduction silencer for steam boiler air discharge, comprising a shell 1 and a bottom cover 2. The bottom cover 2 is provided on the outside of the shell 1. An expansion hood 3 is installed at the bottom end of the bottom cover 2. A conveying pipe 4 is installed at the bottom end of the expansion hood 3. A flange 5 is installed at the bottom end of the conveying pipe 4. A top cover 6 is provided on the outside of the flange 5. A support frame 7 is installed at the top of the top cover 6. Multiple sets of first U-shaped frames 8 are symmetrically installed at equal intervals on the side walls of the shell 1. Multiple sets of second U-shaped frames 9 are installed at equal intervals on the side walls of both the bottom cover 2 and the top cover 6. The interior of the first U-shaped frames 8... All are equipped with a rotating shaft 10, and the surface of the rotating shaft 10 is fitted with a threaded rod 11. The exterior of the second U-shaped frame 9 is provided with a C-shaped plate 13, and the exterior of the C-shaped plate 13 is provided with a threaded sleeve 12. The threaded rod 11 extends through the C-shaped plate 13 to its exterior and is threadedly connected to the threaded sleeve 12. The inner wall of the outer shell 1 is equipped with a sound-absorbing plate 14, and the inner wall of the sound-absorbing plate 14 is equipped with an inner tube 15. The exterior of the inner tube 15 is provided with a support frame 16, which extends into the interior of the inner tube 15. The interior of the support frame 16 is equipped with multiple sets of perforated tubes 17 at equal intervals. Support columns 18 are symmetrically installed at the top of the support frame 16, and end plates 19 are installed at the top of the support columns 18. Multiple sets of through holes 28 with equal spacing are provided inside the end plates 19, and grooves 20 are provided inside the bottom cover 2. When using a multi-stage noise reduction silencer for steam boiler exhaust, flange 5 is connected to the external steam equipment. Steam enters the interior of expansion chamber 3 through flange 5 and conveying pipe 4. Expansion chamber 3 is a chamber with a diameter much larger than conveying pipe 4. After entering, the steam volume suddenly expands, the flow velocity drops sharply, and the pressure also decreases. Subsequently, the steam is divided and guided through multiple sets of perforated pipes 17. The perforated pipes 17 divide the large airflow into multiple sets of small airflows, effectively disturbing large-scale turbulence and preparing for the reduction of high-frequency noise. It mainly utilizes the principle of acoustic impedance. Through the abrupt change in the pipe cross-section, the sound waves are reflected and interfered during propagation, thereby consuming sound energy. It has a good effect on mid-to-low frequency noise. After the steam exits from the perforated pipes 17, when the sound waves pass through the sound-absorbing plate 14, it causes friction and vibration of air molecules and fibers, converting sound energy into heat energy and consuming it. Thus, the sound-absorbing plate 14 reduces the noise of the sound waves. The steam continues to pass through end plate 19. The surface of the end plate 19 has multiple sets of through holes 28. The through holes 28 can shift noise energy from the low-to-mid frequency band that the human ear is sensitive to to the high frequency band. High frequency noise attenuates faster in the atmosphere. Since the total flow area of ​​the through holes 28 is larger than the area of ​​the conveying pipe 4, the steam outlet velocity is further reduced, allowing steam to be discharged through the multiple sets of louvers 23 on the surface of the support frame 7. When disassembly is required, the multiple sets of threaded sleeves 12 are turned. Under the threaded connection between the threaded sleeves 12 and the threaded rods 11, and under the support of the rotating shaft 10, the threaded sleeves 12 and the threaded rods 11 are disengaged, thereby removing the C-shaped plate 13. The bottom cover 2 and the top cover 6 are also removed. Since the support frame 16 is placed on the top of the bottom cover 2, when the bottom cover 2 is removed, the support frame 16 falls, making it convenient to clean the support frame 16, the perforated pipe 17, and the end plate 19. This achieves convenient multi-stage noise reduction of the silencer, reduces the impact on people and the environment, and facilitates disassembly and maintenance. A support plate 21 is installed on the side wall of the support frame 7, and a servo motor 22 is installed on the side wall of the support plate 21. The support frame 7 has four sets of louvers 23 with equal spacing on its exterior. Rotating shafts 24 are installed on both sides of the louvers 23. The rotating shafts 24 extend through the support frame 7 to its exterior. The output end of the servo motor 22 is connected to a set of rotating shafts 24. All surfaces of the rotating shaft 24 are fitted with rocker arms 25. On the side of the rocker arms 25 away from the rotating shaft 24, a support shaft 26 is movably installed. A cross arm 27 is provided on the outside of the support frame 7. The support shaft 26 is movably connected to the cross arm 27. When not in use, the servo motor 22 is turned on. Supported by the support plate 21, the servo motor 22 drives a set of rotating shafts 24 to rotate. The set of rotating shafts 24 drives a set of louvers 23 to rotate. The set of rotating shafts 24 drives a set of rocker arms 25 to rotate. The set of rocker arms 25 drives a set of support shafts 26 to rotate a horizontal arm 27. The horizontal arm 27 drives the remaining sets of support shafts 26, rocker arms 25, and rotating shafts 24 to rotate around the rotating shaft 24. The rotating shaft 24 drives the remaining sets of louvers 23 to rotate, causing multiple sets of louvers 23 to rotate and close, thereby preventing external dust from falling into the interior. This allows the muffler to be easily rotated and closed, preventing external dust from falling into the interior and improving the muffler's performance.

[0018] Working Principle: When using a multi-stage noise reduction silencer for steam boiler air discharge, flange 5 is connected to the external steam equipment. Steam enters the interior of expansion hood 3 through flange 5 and conveying pipe 4. Expansion hood 3 is a chamber with a diameter much larger than conveying pipe 4. After entering, the steam volume suddenly expands, the flow velocity drops sharply, and the pressure also decreases. Subsequently, the steam is separated and guided through multiple sets of perforated pipes 17. The perforated pipes 17 divide the large airflow into multiple sets of small airflows, effectively disturbing large-scale turbulence and preparing for the reduction of high-frequency noise. This mainly utilizes the principle of acoustic impedance. The abrupt change in the pipe cross-section causes sound waves to reflect and interfere during propagation, thus consuming sound energy. This is effective for reducing low- and mid-frequency noise. After steam exits from the perforated pipe 17, when sound waves pass through the sound-absorbing plate 14, it causes friction and vibration of air molecules and fibers, converting sound energy into heat energy, which is then consumed. This achieves noise reduction by the sound-absorbing plate 14. The steam continues to pass through the end plate 19, whose surface has multiple sets of through holes 28. These through holes 28 can shift noise energy from the low- and mid-frequency range that the human ear is sensitive to to the high-frequency range. High-frequency noise attenuates faster in the atmosphere because of the through holes 28. The total flow area of ​​8 is greater than that of the conveying pipe 4, thereby further reducing the steam outlet velocity, allowing steam to be discharged through the multiple sets of louvers 23 on the surface of the support frame 7. When disassembly is required, the multiple sets of threaded sleeves 12 are turned to disengage the threaded sleeves 12 from the threaded rods 11, thereby removing the C-shaped plate 13, and removing the bottom cover 2 and the top cover 6. Since the support frame 16 is placed on top of the bottom cover 2, the support frame 16 falls off when the bottom cover 2 is removed, making it convenient to clean the support frame 16, the perforated pipe 17, and the end plate 19. The servo motor 22 drives a... A set of rotating shafts 24 rotates, which in turn drives a set of louvers 23 to rotate. This rotating shaft 24 then drives a set of rocker arms 25 to rotate. The rocker arms 25, through a set of support shafts 26, drive a horizontal arm 27 to rotate. The horizontal arm 27 then drives the remaining sets of support shafts 26, rocker arms 25, and rotating shafts 24 to rotate around the rotating shaft 24. The rotating shaft 24 then drives the remaining sets of louvers 23 to rotate, causing multiple sets of louvers 23 to rotate and close, thus preventing external dust from falling into the interior and completing the function of the silencer.

Claims

1. A multi-stage noise reduction silencer for steam boiler exhaust, characterized in that: Includes an outer shell (1) and a bottom cover (2). The outer shell (1) is provided with a bottom cover (2). An expansion cover (3) is installed at the bottom end of the bottom cover (2). A conveying pipe (4) is installed at the bottom end of the expansion cover (3). A flange (5) is installed at the bottom end of the conveying pipe (4). A top cover (6) is provided on the outside of the flange (5). A support frame (7) is installed at the top of the top cover (6). Multiple sets of first U-shaped frames (8) are symmetrically installed at equal intervals on the side walls of the outer shell (1). Multiple sets of second U-shaped frames (9) are installed at equal intervals on the side walls of both the bottom cover (2) and the top cover (6). A rotating shaft (10) is movably installed inside each of the first U-shaped frames (8). (10) is fitted with threaded rods (11) on its surface. The second U-shaped frame (9) is provided with C-shaped plates (13) on its exterior. The C-shaped plates (13) are provided with threaded sleeves (12) on their exterior. The threaded rods (11) extend through the C-shaped plates (13) to their exterior. The threaded rods (11) are threadedly connected to the threaded sleeves (12). The inner wall of the outer shell (1) is fitted with a sound-absorbing plate (14). The inner wall of the sound-absorbing plate (14) is fitted with an inner tube (15). The outer wall of the inner tube (15) is fitted with a support frame (16). The support frame (16) extends into the interior of the inner tube (15). The interior of the support frame (16) is fitted with multiple sets of perforated tubes (17) at equal intervals.

2. The silencer for multi-stage noise reduction of steam boiler exhaust air as described in claim 1, characterized in that: The top of the support frame (16) is symmetrically equipped with support columns (18), and the top of the support columns (18) is equipped with end plates (19).

3. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 2, characterized in that: The end plate (19) has multiple sets of through holes (28) with equal spacing inside, and the bottom cover (2) has a groove (20) inside.

4. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 1, characterized in that: A support plate (21) is installed on the side wall of the support frame (7), and a servo motor (22) is installed on the side wall of the support plate (21).

5. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 4, characterized in that: The support frame (7) is provided with four sets of louvers (23) at equal intervals on the outside, and a rotating shaft (24) is installed on both sides of the louvers (23).

6. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 5, characterized in that: All the rotating shafts (24) extend through the support frame (7) to the outside of it, and the output end of the servo motor (22) is connected to a set of rotating shafts (24).

7. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 6, characterized in that: The surface of the rotating shaft (24) is fitted with rocker arms (25), and the side of the rocker arms (25) away from the rotating shaft (24) is movably fitted with a support shaft (26).

8. A multi-stage noise reduction silencer for steam boiler air discharge according to claim 7, characterized in that: The support frame (7) is provided with a cross arm (27) on its outside, and the support shaft (26) is movably connected to the cross arm (27).

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