A sound-absorbing shield for reducing noise of a boiler

Abstract

The utility model provides a kind of sound-absorbing baffle for boiler noise reduction belongs to boiler noise reduction technical field, the sound-absorbing baffle for this boiler noise reduction includes: baffle body, sound-absorbing layer, fixed support, connecting plate, sealing strip and support rod;The baffle body is rectangular plate structure, the inner surface of baffle body is provided with multiple recesses in honeycomb distribution, the depth of each recess is 5 millimeter to 15 millimeter;The sound-absorbing layer is fixedly arranged in the recess of baffle body inner surface, and sound-absorbing layer is made of porous foam material;The fixed support includes upper fixed strip and lower fixed strip, and upper fixed strip is connected on the upper end edge of baffle body by bolt, and lower fixed strip is connected on the lower end edge of baffle body by bolt;One end of the connecting plate is connected with the upper fixed strip of fixed support by hinge shaft, and the other end of the connecting plate extends to boiler wall surface and is fixed by expansion bolt;The utility model can solve the technical problem of poor noise reduction effect of existing boiler noise reduction baffle.

Description

Technical Field

[0001] This utility model belongs to the field of boiler noise reduction technology, specifically, it relates to a sound-absorbing protective plate for boiler noise reduction. Background Technology

[0002] Boilers, as crucial equipment in industrial production, generate significant noise during operation, primarily including combustion noise, fan noise, and water circulation noise. This noise not only affects the working environment of operators but also disturbs the lives of nearby residents. Current technology mainly uses noise-reducing panels installed around the boiler to control noise propagation. Common noise-reducing panels are mostly flat structures with sound-absorbing materials coated or pasted on the surface. However, existing noise-reducing panels have several technical drawbacks: Firstly, because boilers are often installed at a certain angle, existing panels are mostly rigidly fixed, unable to be flexibly adjusted as needed, resulting in significant sound wave leakage and affecting the noise reduction effect. Secondly, there are issues with the sound-absorbing structure. Existing panels mostly use planar sound-absorbing structures, with the sound-absorbing material directly attached to the flat surface. This structure relies mainly on the porous nature of the material for sound wave absorption, lacking effective control over the sound wave propagation path, especially limiting the absorption effect on low- and mid-frequency noise generated by the boiler. Thirdly, there are issues with support stability. Existing panel support systems mostly use rigid connections, unable to adapt to vibrations and thermal expansion deformation during boiler operation, easily leading to panel misalignment and affecting the sustainability of the noise reduction effect. Finally, there is the issue of high-temperature resistance. During boiler operation, the surface temperature is high, and the existing heat dissipation design of the protective plates is insufficient, easily leading to material deformation or a decline in the performance of the sound-absorbing materials due to overheating. To address these technical problems, existing technologies mainly employ methods such as increasing the thickness of the protective plates, selecting higher-grade sound-absorbing materials, and strengthening the fixing methods. However, these methods often increase costs and installation complexity, and do not fundamentally solve the core problem of the protective plates not adhering tightly to the boiler wall. Utility Model Content

[0003] In view of this, the present invention provides a sound-absorbing protective plate for boiler noise reduction, which can solve the technical problem of poor noise reduction effect of existing boiler noise reduction protective plates.

[0004] This utility model is implemented as follows: This utility model provides a sound-absorbing protective plate for boiler noise reduction, comprising: a protective plate body, a sound-absorbing layer, a fixing frame, a connecting plate, a sealing strip, and a support rod; the protective plate body has a rectangular plate structure, and the inner surface of the protective plate body is provided with multiple honeycomb-shaped grooves, each groove having a depth of 5 mm to 15 mm; the sound-absorbing layer is fixedly disposed in the grooves on the inner surface of the protective plate body, and the sound-absorbing layer is made of porous foam material; the fixing frame includes an upper fixing strip and a lower fixing strip, the upper fixing strip being bolted to the upper edge of the protective plate body, and the lower fixing strip being bolted to the upper edge of the protective plate body. The strip is bolted to the lower edge of the guard plate body; one end of the connecting plate is connected to the upper fixing strip of the fixing frame via a hinge shaft, and the other end of the connecting plate extends to the boiler wall and is fixed by expansion bolts; the sealing strip has an L-shaped structure, with the horizontal section of the sealing strip fitting against the joint between the guard plate body and the boiler wall, and the vertical section of the sealing strip fitting against the side edge of the guard plate body; the upper end of the support rod is connected to the middle position of the connecting plate via a universal joint, and the lower end of the support rod is fixed to the ground foundation with anchor bolts to support the guard plate body and maintain a vertical and stable state.

[0005] The technical effects of the sound-absorbing guard plate for boiler noise reduction provided by this utility model are as follows: By setting honeycomb-shaped grooves on the inner surface of the guard plate and filling them with sound-absorbing layers, a multi-layered sound wave absorption structure is formed, which effectively reduces the noise generated by boiler operation; the hinged connection between the fixing frame and the connecting plate allows the guard plate to be adjusted in angle as needed; the support rod is connected by a universal joint to provide stable support force and prevent the guard plate from swaying under boiler vibration or wind load; the L-shaped structure of the sealing strip effectively seals the joint with the boiler wall, preventing sound waves from leaking from the gaps and improving the overall noise reduction effect.

[0006] Based on the above technical solution, the sound-absorbing protective panel for boiler noise reduction of this utility model can be further improved as follows: The thickness of the protective plate body is 20 mm to 40 mm. The protective plate body is made of stainless steel. The outer surface of the protective plate body is provided with heat dissipation ribs. The heat dissipation ribs are evenly distributed along the vertical direction of the protective plate body, and the spacing between adjacent heat dissipation ribs is 50 mm to 80 mm.

[0007] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the stainless steel material of the guard plate body has good corrosion resistance and high temperature resistance, and is suitable for the high temperature environment of the boiler; the heat dissipation ribs set on the outer surface increase the heat dissipation area, effectively reduce the temperature of the guard plate body, and prevent material deformation caused by overheating; the reasonable thickness design ensures the strength of the guard plate and avoids installation difficulties caused by excessive weight; the evenly distributed heat dissipation ribs make the heat distribution uniform and improve the heat dissipation efficiency.

[0008] Furthermore, both the upper and lower fixing bars of the fixing frame are angle steel structures. The vertical flanges of the angle steel are connected to the edge of the guard plate body by bolts spaced 25 mm apart. The horizontal flanges of the angle steel extend outward to form a mounting surface. The connecting plate is mounted on the horizontal flange of the upper fixing bar through a hinge shaft. The axis of the hinge shaft is parallel to the upper edge of the guard plate body.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the fixing frame adopts an angle steel structure with good strength and rigidity, which can withstand the weight of the guard plate body and external loads; the bolt connection between the vertical flange of the angle steel and the edge of the guard plate body is reliable and the force transmission is clear; the mounting surface formed by the outward extension of the horizontal flange provides a stable hinge mounting base for the connecting plate; the arrangement of the hinge axis centerline parallel to the upper edge of the guard plate allows the guard plate to rotate around the horizontal axis to adjust the angle and adapt to different installation tilt angles.

[0010] Furthermore, the connecting plate has a trapezoidal plate structure, with the width of the end of the connecting plate near the hinge axis being 150 mm to 200 mm, the width of the end of the connecting plate away from the hinge axis being 100 mm to 120 mm, the length of the connecting plate being 300 mm to 500 mm, and the thickness of the connecting plate being 8 mm to 12 mm.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the trapezoidal plate structure design of the connecting plate makes the stress distribution more reasonable and avoids the stress concentration phenomenon of rectangular plates under concentrated loads; the larger width near the hinge shaft end provides sufficient hinge connection area, while the smaller width away from the hinge shaft end reduces the weight of the connecting plate; the reasonable length and thickness dimensions ensure the strength of the connecting plate and meet the installation space requirements, so that the connecting plate has good bending resistance while bearing the weight of the guard plate.

[0012] Furthermore, the sealing strip is made of high-temperature resistant silicone rubber material. In the L-shaped structure of the sealing strip, the length of the horizontal section is 15 mm to 25 mm, the length of the vertical section is 10 mm to 20 mm, and the cross-sectional thickness of the sealing strip is 3 mm to 8 mm.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sealing strip is made of high-temperature resistant silicone rubber material, which can maintain good elasticity and sealing performance in the high-temperature environment of the boiler, and will not age or become brittle after long-term use; the L-shaped structure design allows the sealing strip to seal the joints in both horizontal and vertical directions at the same time, forming a continuous sealing band; the reasonable size ratio of the horizontal and vertical sections allows the sealing strip to effectively fill the joints without being too large and affecting the installation of the protective plate; the appropriate cross-sectional thickness ensures the compression and rebound performance of the sealing strip.

[0014] Furthermore, the support rod is a hollow cylindrical tube structure with an outer diameter of 60 mm to 100 mm and a wall thickness of 5 mm to 10 mm. The universal joint includes an upper ball head and a lower ball seat. The upper ball head is fixed to the upper end of the support rod and mates with the preset mounting hole of the connecting plate. The lower ball seat is fixed to the lower end of the support rod and mates with the embedded parts of the ground foundation.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the hollow circular tube structure of the support rod reduces weight and lowers the foundation bearing requirements while ensuring strength; the reasonable outer diameter and wall thickness design gives the support rod good compressive and bending resistance; the universal joint setting allows the support rod to adapt to changes in the installation angle of the guard plate, ensuring that the supporting force is always transmitted along the axis of the support rod; the matching method of the upper ball head and the lower ball seat gives the universal joint good rotational flexibility and load-bearing capacity, ensuring the stability and reliability of the support system.

[0016] Furthermore, the grooves on the inner surface of the protective plate body are hexagonal honeycomb structures, and the diameter of the inscribed circle of each hexagonal groove is 8 mm to 15 mm.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the hexagonal honeycomb groove structure has the best space utilization rate, and more sound-absorbing units can be set in the same area; the geometric characteristics of the hexagonal structure cause sound waves to be reflected and scattered multiple times in the groove, increasing the propagation path of sound waves and improving the sound energy absorption efficiency; the reasonable inner circle diameter size allows the groove to accommodate enough sound-absorbing material without being too large and affecting the strength of the protective plate body, thus achieving the best balance between sound absorption performance and structural strength.

[0018] Compared with existing technologies, the beneficial effects of the sound-absorbing guard plate for boiler noise reduction provided by this utility model are as follows: This utility model, through the design of a guard plate body with a honeycomb groove structure and a porous sound-absorbing layer, forms a highly efficient sound wave absorption system that can effectively absorb noise in various frequency bands generated during boiler operation. The hexagonal honeycomb groove structure on the inner surface of the guard plate body increases the number of sound wave reflections and the propagation path. Combined with the porous foam sound-absorbing layer filled in the grooves, it achieves multi-level absorption and conversion of sound energy. The hinged connection design between the fixing frame and the connecting plate allows the guard plate angle to be precisely adjusted as needed. The L-shaped structure design of the sealing strip can effectively seal the horizontal and vertical seams between the guard plate and the boiler wall, forming a continuous sealing band to prevent sound waves from propagating through the gaps. The support rod, connected by a universal joint, provides stable support force, ensuring that the guard plate maintains a stable installation state under boiler vibration and external wind load. The heat dissipation rib design on the outer surface of the guard plate body effectively reduces the temperature of the guard plate, ensuring long-term stable operation in high-temperature environments. Through structural optimization and material selection, the entire system achieves comprehensive technical effects such as high-efficiency noise reduction, stable installation, high temperature resistance, and easy maintenance, which represents a significant technological advancement compared to existing technologies. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a sound-absorbing protective panel for boiler noise reduction; The attached diagram lists the components represented by each number as follows: 10. Protective panel body; 11. Groove; 20. Sound-absorbing layer; 30. Fixing frame; 31. Upper fixing strip; 32. Lower fixing strip; 40. Connecting plate; 50. Sealing strip; 60. Support rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figure 1 The image shows an embodiment of a sound-absorbing protective plate for boiler noise reduction provided by this utility model. In this embodiment, it includes: a protective plate body 10, a sound-absorbing layer 20, a fixing frame 30, a connecting plate 40, a sealing strip 50, and a support rod 60. The protective plate body has a rectangular plate structure, and its inner surface is provided with multiple honeycomb-shaped grooves 11, each groove having a depth of 5 mm to 15 mm. The sound-absorbing layer is fixedly disposed within the grooves on the inner surface of the protective plate body and is made of porous foam material. The fixing frame includes an upper fixing strip 31 and a lower fixing strip 32, the upper fixing strip being secured by bolts. The upper edge of the guard plate body is connected to the lower edge of the guard plate body by bolts; one end of the connecting plate is connected to the upper fixing strip of the fixing frame by a hinge shaft, and the other end of the connecting plate extends to the boiler wall and is fixed by expansion bolts; the sealing strip has an L-shaped structure, the horizontal section of the sealing strip fits the joint between the guard plate body and the boiler wall, and the vertical section of the sealing strip fits the side edge of the guard plate body; the upper end of the support rod is connected to the middle position of the connecting plate by a universal joint, and the lower end of the support rod is fixed to the ground foundation by anchor bolts to support the guard plate body and maintain a vertical and stable state.

[0023] In the above technical solution, the thickness of the protective plate body is 20 mm to 40 mm, the protective plate body is made of stainless steel, and the outer surface of the protective plate body is provided with heat dissipation ribs. The heat dissipation ribs are evenly distributed along the vertical direction of the protective plate body, and the spacing between adjacent heat dissipation ribs is 50 mm to 80 mm.

[0024] Furthermore, in the above technical solution, both the upper and lower fixing bars of the fixing frame are angle steel structures. The vertical flanges of the angle steel are connected to the edge of the guard plate body by bolts spaced 25 mm apart. The horizontal flanges of the angle steel extend outward to form a mounting surface. The connecting plate is mounted on the horizontal flange of the upper fixing bar through a hinge shaft. The axis of the hinge shaft is parallel to the upper edge of the guard plate body.

[0025] Furthermore, in the above technical solution, the connecting plate has a trapezoidal plate structure, the width of the end of the connecting plate near the hinge axis is 150 mm to 200 mm, the width of the end of the connecting plate away from the hinge axis is 100 mm to 120 mm, the length of the connecting plate is 300 mm to 500 mm, and the thickness of the connecting plate is 8 mm to 12 mm.

[0026] Furthermore, in the above technical solution, the sealing strip is made of high-temperature resistant silicone rubber material. The length of the horizontal section in the L-shaped structure of the sealing strip is 15 mm to 25 mm, the length of the vertical section is 10 mm to 20 mm, and the cross-sectional thickness of the sealing strip is 3 mm to 8 mm.

[0027] Furthermore, in the above technical solution, the support rod is a hollow round tube structure with an outer diameter of 60 mm to 100 mm and a wall thickness of 5 mm to 10 mm. The universal joint includes an upper ball head and a lower ball seat. The upper ball head is fixed to the upper end of the support rod and mates with the pre-set mounting hole of the connecting plate. The lower ball seat is fixed to the lower end of the support rod and mates with the pre-embedded parts of the ground foundation.

[0028] Furthermore, in the above technical solution, the grooves on the inner surface of the protective plate body are hexagonal honeycomb structures, and the diameter of the inscribed circle of each hexagonal groove is 8 mm to 15 mm.

[0029] First, prepare for installation by measuring the tilt angle of the boiler wall and the dimensions of the installation area to determine the installation position and quantity of the protective plates. Pre-embed anchor bolts for the support rods in the ground foundation, mark the installation positions of the connecting plates on the boiler wall, and drill holes to install expansion bolts. Next, assemble the protective plate body. Cut the sound-absorbing material into a shape matching the honeycomb grooves and fill it into the grooves on the inner surface of the protective plate body. The filling depth should be controlled to approximately 85% of the total groove depth, ensuring an appropriate air gap between the sound-absorbing layer surface and the inner surface of the protective plate. Next, install the fixing brackets, fixing the upper and lower fixing strips to the upper and lower edges of the protective plate body with bolts, ensuring that the horizontal flanges of the fixing strips extend outwards and are perpendicular to the protective plate body. Then, install the connecting plates, connecting them to the horizontal flanges of the upper fixing strips via hinge shafts. Adjust the tightness of the hinge shafts to allow the connecting plates to rotate freely while maintaining a certain level of damping. Next, install the support rod. Secure the lower end of the support rod to the embedded parts in the ground foundation using anchor bolts. Connect the upper end of the support rod to the middle of the connecting plate using a universal joint. Adjust the universal joint to create a suitable angle between the support rod and the connecting plate. Then, fix the other end of the connecting plate to the boiler wall using expansion bolts. Finally, install the sealing strip. Place the horizontal section of the L-shaped sealing strip against the joint between the protective plate and the boiler wall, and the vertical section against the side edge of the protective plate, forming a continuous sealing strip. During routine maintenance, regularly check the tightness of the bolt connections, clean the dust from the surface of the heat dissipation fins, check the aging of the sealing strip, and replace it promptly to ensure the long-term effective operation of the noise reduction system.

[0030] The following is a specific embodiment 1 of this utility model: The sound-absorbing protective plate for boiler noise reduction in this embodiment is applied to the noise reduction project of an industrial boiler with a rated power of 10 MW. The protective plate body is made of 316 stainless steel plate with a thickness of 30 mm. The overall dimensions of the protective plate are 2000 mm in length and 1500 mm in width. The inner surface of the protective plate body is machined into hexagonal honeycomb grooves. The inscribed circle diameter of each hexagonal groove is 12 mm, the groove depth is 10 mm, and the wall thickness between adjacent grooves is 2 mm. Approximately 15,000 grooves are set on the entire inner surface, forming a dense honeycomb sound-absorbing structure. The sound-absorbing layer uses polyurethane foam material with an open porosity of 90%, a foam density of 30 kg / m³, and a temperature resistance rating of 150 degrees Celsius. The sound-absorbing layer material is pressed into hexagonal blocks that match the shape of the grooves using a special mold. Each block is 8.5 mm thick, and after being filled into the grooves, a 1.5 mm air gap is left between the surface of the block and the inner surface of the protective plate. The outer surface of the guard plate is equipped with heat dissipation ribs. These ribs have an isosceles triangular cross-section, with a base width of 10 mm and a height of 8 mm. The ribs are evenly spaced 60 mm apart along the vertical direction of the guard plate, with a total of 33 ribs per guard plate. The upper and lower fixing bars of the mounting bracket are made of 50 mm × 50 mm × 5 mm equilateral angle steel, with a length of 1500 mm, the same as the width of the guard plate. The angle steel is connected to the guard plate body with M8 bolts at a spacing of 25 mm, using 60 bolts per fixing bar. The connecting plate is made of Q235 carbon steel plate, 10 mm thick, with a trapezoidal shape. The width near the hinge axis is 180 mm, and the width away from the hinge axis is 110 mm. The connecting plate is 400 mm long. A reinforcing rib is installed on each of the two waist-positions of the connecting plate, with dimensions of 300 mm long, 30 mm high, and 8 mm thick. The hinge shaft is made of 20mm diameter stainless steel, and the bearing is a 6204 deep groove ball bearing. The support rod is made of seamless steel pipe with an outer diameter of 80mm, a wall thickness of 8mm, and a length of 2200mm. The universal joint is an industrial standard GU30 type universal joint with a load capacity of 5000 Newtons. The sealing strip is made of silicone rubber with a hardness of Shore A70. The horizontal section of the L-shaped cross-section is 20mm long, the vertical section is 15mm long, and the cross-sectional thickness is 5mm. The entire protective plate system is installed on the side of the boiler, with the boiler wall inclined outward at an 8-degree angle. During installation, anchor bolts for the support rods are first pre-embedded in the ground foundation 800mm away from the boiler wall. Then, the entire protective plate system is hoisted into place. After installation, the protective plate system performs stably during normal boiler operation, with the surface temperature of the protective plate controlled below 80 degrees Celsius. Measurements using a sound level meter show that the noise level 1 meter outside the protective plate is 12 decibels lower than before installation, achieving the expected noise reduction effect. The protective plate was inspected after the boiler had been running continuously for 6 months. All connections were secure and reliable, the sound-absorbing material was stable, the sealing strips showed no signs of aging, and the entire system was in good working order.

[0031] The following is another specific embodiment 2 of this utility model: Embodiment 2 is an improvement on Embodiment 1, specifically designed for applications in higher temperature environments. The boiler is a large industrial boiler with a rated power of 20 MW, and the boiler wall temperature can reach 300 degrees Celsius. In this high-temperature environment, the protective plate body is made of 310 stainless steel, which has better high-temperature resistance and oxidation resistance. The thickness of the protective plate body is increased to 35 mm to enhance structural strength. The design of the heat dissipation ribs has been optimized, with the rib height increased to 12 mm, the bottom edge width increased to 15 mm, and the spacing reduced to 45 mm, increasing the number of heat dissipation ribs per protective plate to 44, significantly improving heat dissipation efficiency. The sound-absorbing layer is replaced with a high-temperature foam material with a temperature resistance rating of 250 degrees Celsius, and the material density is increased to 40 kg / m³ to improve high-temperature stability. To further improve the heat dissipation effect, a forced ventilation system is added between the protective plate body and the boiler wall. An axial flow fan installed below the protective plate sends air into the gap between the protective plate and the boiler wall, forming forced convection heat dissipation. The fan has a power of 200 watts and an air volume of 1000 cubic meters per hour. The connecting plate is made of heat-resistant steel, which maintains good mechanical properties in high-temperature environments. The sealing strip is made of fluororubber, with a temperature resistance rating of 300 degrees Celsius and a hardness adjusted to Shore A80 to meet the requirements of high-temperature use. A heat insulation layer is added inside the support rod, using ceramic fiber felt as the insulation material to prevent the support rod from affecting structural stability due to overheating. With this improved design, the protective plate system can operate stably in high-temperature environments, with the surface temperature of the protective plate controlled below 120 degrees Celsius, and the noise reduction effect reaches 15 decibels, meeting the noise reduction requirements of large high-temperature boilers.

[0032] The following is another specific embodiment 3 of this utility model: Embodiment 3 is an improvement on Embodiment 1, specifically designed for marine boilers operating in marine environments. Marine boilers face unique challenges in marine environments, including salt spray corrosion, hull vibration, and space constraints. The protective plate body is made of super duplex stainless steel 2507, which has excellent seawater corrosion resistance. The overall dimensions of the protective plate are adjusted to 1500 mm in length and 1200 mm in width, with the thickness reduced to 25 mm to reduce weight, based on the space constraints of the ship's cabin. The design of the honeycomb grooves has been optimized, with the groove depth reduced to 8 mm and the inscribed circle diameter reduced to 10 mm, while the number of grooves has been increased to maintain sound absorption. The sound-absorbing layer uses a closed-cell foam material to prevent moisture penetration in the marine environment. To adapt to the vibration environment of the hull, the support system is specially designed, with vibration dampers added between the support rods and the ground foundation. These dampers use a rubber spring structure to effectively isolate the impact of hull vibration on the protective plate system. The universal joint design has been strengthened, using stainless steel and incorporating a sealing structure to prevent seawater erosion. The thickness of the connecting plate has been increased to 12 mm to improve vibration resistance, and a special anti-corrosion coating has been applied to its surface. The sealing strip is made of neoprene rubber, which has excellent seawater resistance and anti-aging properties. All bolted connections in the entire liner system are made of 316 stainless steel and anti-seize agent is used to prevent corrosion and seizing in the marine environment. For easy maintenance at sea, the liner is designed with a modular structure, and each module can be disassembled and replaced independently. In actual marine applications, the liner system has demonstrated good corrosion resistance and vibration resistance. After 12 months of operation, all components are in good condition, and the noise reduction effect has been stably maintained above 10 decibels, meeting the noise reduction requirements of marine boilers in harsh marine environments.

[0033] The specific principle of this utility model is as follows: This utility model solves the core technical problem of poor adhesion between the boiler noise reduction guard plate and the boiler wall through the synergistic effect of multiple technological innovations. Firstly, in terms of acoustic design, the hexagonal honeycomb groove structure set on the inner surface of the guard plate is based on the multi-reflection sound absorption theory in acoustics. When sound waves are incident on the honeycomb grooves, they will be reflected multiple times on the inner wall of the grooves, increasing the propagation path of the sound waves and prolonging the residence time of the sound waves in the sound-absorbing material, thereby improving the sound energy absorption efficiency. The hexagonal honeycomb structure has optimal geometric characteristics, which can achieve the largest sound-absorbing surface area in the smallest space. At the same time, the depth design of the honeycomb structure forms an acoustic resonance cavity, which produces a resonant absorption effect on sound waves of specific frequencies. Combined with the porous foam sound-absorbing layer filled in the grooves, a composite sound absorption system combining cavity sound absorption and porous sound absorption is formed, which can effectively absorb the broadband noise generated by the boiler. Secondly, in terms of mechanical structure design, the hinge connection mechanism between the fixing frame and the connecting plate is based on the principle of planar mechanism. The setting of the hinge axis allows the guard plate to rotate around the horizontal axis, realizing the continuous adjustment of the guard plate installation angle. The trapezoidal design of the connecting plate is based on the variable cross-section beam theory in mechanics of materials. The trapezoidal cross-section allows for a more uniform stress distribution, avoids stress concentration, and improves the load-bearing capacity of the connecting plate. The fit between the support rod and the universal joint is based on the principles of spatial mechanics. The universal joint can adapt to changes in the installation angle of the liner plate, ensuring that the support force is always transmitted in the optimal direction. At the same time, the ball joint's ball joint structure can absorb displacement caused by boiler vibration and thermal expansion, maintaining the stability of the liner plate's installation position. Furthermore, in terms of sealing design, the L-shaped sealing strip, based on sealing technology principles, fills the joint through the compression deformation of elastic materials, forming a continuous sealing band to prevent sound wave leakage and propagation. Finally, in terms of thermal management, the heat dissipation ribs on the outer surface of the liner plate are based on the principles of heat transfer, increasing the heat dissipation area and promoting air convection to improve heat dissipation efficiency and ensure stable operation of the liner plate in high-temperature environments. The comprehensive application of these technical principles allows the liner plate to fit tightly against the boiler wall, achieving a highly efficient noise reduction effect.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sound-absorbing protective panel for boiler noise reduction, characterized in that, include: The system comprises a protective plate body, a sound-absorbing layer, a fixing frame, a connecting plate, a sealing strip, and a support rod. The protective plate body has a rectangular plate structure, and its inner surface has multiple honeycomb-shaped grooves, each with a depth of 5 mm to 15 mm. The sound-absorbing layer is fixedly installed in the grooves on the inner surface of the protective plate body and is made of porous foam material. The fixing frame includes an upper fixing strip and a lower fixing strip. The upper fixing strip is bolted to the upper edge of the protective plate body, and the lower fixing strip is bolted to the lower edge of the protective plate body. One end of the connecting plate is connected to the upper fixing strip of the fixing frame via a hinge shaft, and the other end of the connecting plate extends to the boiler wall and is fixed with expansion bolts. The sealing strip has an L-shaped structure. The horizontal section of the sealing strip fits the joint between the protective plate body and the boiler wall, and the vertical section of the sealing strip fits the side edge of the protective plate body. The upper end of the support rod is connected to the middle of the connecting plate via a universal joint, and the lower end of the support rod is fixed to the ground foundation with anchor bolts to support the protective plate body and maintain its vertical stability.

2. The sound-absorbing protective panel for boiler noise reduction according to claim 1, characterized in that, The thickness of the protective plate body is 20 mm to 40 mm. The protective plate body is made of stainless steel. The outer surface of the protective plate body is provided with heat dissipation ribs. The heat dissipation ribs are evenly distributed along the vertical direction of the protective plate body, and the spacing between adjacent heat dissipation ribs is 50 mm to 80 mm.

3. The sound-absorbing protective panel for boiler noise reduction according to claim 2, characterized in that, The upper and lower fixing bars of the fixing frame are both made of angle steel. The vertical flanges of the angle steel are connected to the edge of the guard plate body by bolts spaced 25 mm apart. The horizontal flanges of the angle steel extend outward to form a mounting surface. The connecting plate is mounted on the horizontal flange of the upper fixing bar by a hinge shaft. The axis of the hinge shaft is parallel to the upper edge of the guard plate body.

4. The sound-absorbing protective panel for boiler noise reduction according to claim 3, characterized in that, The connecting plate has a trapezoidal plate structure. The width of the end of the connecting plate near the hinge axis is 150 mm to 200 mm, the width of the end of the connecting plate away from the hinge axis is 100 mm to 120 mm, the length of the connecting plate is 300 mm to 500 mm, and the thickness of the connecting plate is 8 mm to 12 mm.

5. The sound-absorbing protective panel for boiler noise reduction according to claim 4, characterized in that, The sealing strip is made of high-temperature resistant silicone rubber material. The horizontal section of the L-shaped structure of the sealing strip is 15 mm to 25 mm long, the vertical section is 10 mm to 20 mm long, and the cross-sectional thickness of the sealing strip is 3 mm to 8 mm.

6. The sound-absorbing protective panel for boiler noise reduction according to claim 5, characterized in that, The support rod is a hollow cylindrical tube structure with an outer diameter of 60 mm to 100 mm and a wall thickness of 5 mm to 10 mm. The universal joint includes an upper ball head and a lower ball seat. The upper ball head is fixed to the upper end of the support rod and mates with the preset mounting hole of the connecting plate. The lower ball seat is fixed to the lower end of the support rod and mates with the embedded parts of the ground foundation.

7. The sound-absorbing protective panel for boiler noise reduction according to claim 6, characterized in that, The grooves on the inner surface of the protective plate body are hexagonal honeycomb structures, and the diameter of the inscribed circle of each hexagonal groove is 8 mm to 15 mm.

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