Laboratory noise control structure

Abstract

The utility model provides a laboratory noise control structure, which relates to the technical field of noise control structures, and comprises an exhaust duct body, a placement cavity is arranged in the exhaust duct body, a built-in noise reduction layer is arranged in the placement cavity, a plurality of buffer noise reduction structures are further mounted on the outer side of the exhaust duct body, and the buffer noise reduction structures are arranged in the placement cavity. The buffering and noise reducing structure is arranged on the outer side of the exhaust pipeline body, vibration generated by high-speed operation of a fan can be effectively buffered through the combination of the first silencing spring and the first damper, the first silencing spring provides elastic support and absorbs vibration energy, the first damper restrains the resonance phenomenon of the springs and rapidly attenuates vibration, and the noise reduction effect is improved. And vibration is prevented from spreading in a pipeline system, so that noise caused by vibration is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to noise control structure technical field especially relates to laboratory noise control structure. BACKGROUND

[0002] The scientific definition of noise is noise, from the physiological point of view, all the sounds that interfere with people's rest, study and work and cause interference to the sounds that people want to hear, that is, unnecessary sound, collectively referred to as noise. When noise causes adverse effects on people and the surrounding environment, it forms noise pollution. In physics, noise refers to all irregular signals (not necessarily sound), such as electromagnetic noise, thermal noise, noise during radio transmission, laser noise, optical fiber communication noise, and noise in the picture when a camera takes a picture.

[0003] According to the laboratory noise control structure disclosed in Chinese patent literature (authorized announcement number: CN221036169U), it relates to the field of noise control structure, the device includes, laboratory main body and the air pipe arranged in one side of laboratory main body, the outer surface of air pipe is wrapped with damping sound insulation felt, the inside of the end of air pipe close to filter plate is provided with polyester fiber sound absorption board. The laboratory noise control structure, by setting multiple groups of filter plates inside the end of air pipe close to air inlet, makes the airflow in the laboratory main body first pass through the filter plate before contacting the sound attenuation device inside the air pipe, thereby avoiding that the impurities in the airflow block the sound attenuation device for a long time, affecting the sound attenuation effect of the sound attenuation device, and through the fixing screw and the mounting port, the filter plate can be continuously cleaned to ensure the filtering effect of the filter plate.

[0004] However, the above-mentioned scheme still has the following deficiencies when implemented:

[0005] The exhaust pipe in the laboratory is used to exhaust waste gas, hot gas and maintain indoor air circulation. During its operation, the high-speed operation of the fan causes strong turbulence of airflow in the pipeline, thereby causing vibration and noise.

[0006] Therefore, we propose a laboratory noise control structure. INVENTION CONTENTS

[0007] The utility model aims at solving the shortcomings in the prior art. The exhaust pipe in the laboratory is used to exhaust waste gas, hot gas and maintain indoor air circulation. During its operation, the high-speed operation of the fan causes strong turbulence of airflow in the pipeline, thereby causing vibration and noise.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] The laboratory noise control structure comprises an exhaust duct body, an accommodation cavity is formed in the exhaust duct body, and an internal sound insulation layer is arranged in the accommodation cavity.

[0010] The buffer noise reduction structure comprises a connecting plate, mounting seats are arranged on the top and bottom of the connecting plate, a plurality of first sound insulation springs are symmetrically arranged on the two mounting seats, first dampers are arranged on the plurality of first sound insulation springs, a fixed sliding seat is arranged on the side wall of the connecting plate, a connecting rod is arranged in the fixed sliding seat, a limiting extrusion plate is arranged at the bottom of the connecting rod, a plurality of second sound insulation springs are arranged between the limiting extrusion plate and the fixed sliding seat, second dampers are arranged on the plurality of second sound insulation springs, and a top mounting plate is arranged at the top of the connecting rod.

[0011] As a preferred scheme of the utility model, the top mounting plate is fixedly connected with the laboratory ceiling through a plurality of bolts, the connecting rod is weldedly connected with the top mounting plate, and the fixed sliding seat is fixedly connected with the connecting plate.

[0012] As a preferred scheme of the utility model, the two mounting seats and the connecting plate are designed in an integral mode, one end of the first sound insulation spring and the first damper is fixedly connected with the mounting seat, and the other end is fixedly connected with the exhaust duct body.

[0013] As a preferred scheme of the utility model, the connecting rod is slidably connected with the fixed sliding seat, the connecting rod is fixedly connected with the limiting extrusion plate, one end of the second damper and the limiting extrusion plate is fixedly connected with the fixed sliding seat, and the other end is fixedly connected with the limiting extrusion plate, and the limiting extrusion plate does not contact the connecting plate.

[0014] As a preferred scheme of the utility model, a first sound insulation layer is arranged on the wall around the inside of the exhaust duct body, and a second sound insulation layer is arranged in the first sound insulation layer.

[0015] As a preferred scheme of the utility model, an exhaust fan body is arranged in the exhaust duct body, a dust removal structure is arranged on one side of the exhaust fan body, and a plurality of micro-perforated plate sound absorption seats are arranged on one side of the dust removal structure.

[0016] As a preferred scheme of the utility model, the material of the first sound insulation layer is rock wool, the material of the second sound insulation layer is glass wool, and the material of the accommodation cavity is polyurethane foam.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The utility model discloses a buffer noise reduction structure is arranged on the outside of the exhaust duct body, utilizes the combination of first sound -absorbing spring and first damper, can effectively buffer the vibration produced because of the high -speed operation of fan, and first sound -absorbing spring provides elastic support, absorbs vibration energy, and first damper is the resonance phenomenon of spring, and fast attenuation vibration prevents vibration from spreading in the pipeline system, thereby reducing the noise caused by vibration.

[0019] And the design of connecting rod, limit extrusion board, second sound -absorbing spring and second damper further enhances the buffer sound absorption effect, when the airflow in the pipeline is too big and causes the pipeline to shake, the structure can be flexibly responded, through the deformation of spring and the energy dissipation of damper, make the pipeline keep relatively stable state, reduce the generation and propagation of noise. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The main structure schematic drawing of laboratory noise control structure is provided for the utility model;

[0021] Figure 2 The installation position schematic drawing of laboratory noise control structure's accommodation cavity is provided for the utility model;

[0022] Figure 3 The overhead section schematic drawing of laboratory noise control structure's exhaust duct body is provided for the utility model;

[0023] Figure 4 The overhead section schematic drawing of laboratory noise control structure's Figure 3 The enlarged schematic drawing of structure in A place of the utility model;

[0024] Figure 5 The buffer noise reduction structure schematic drawing of laboratory noise control structure is provided for the utility model.

[0025] Legend explains: 1, exhaust duct body;2, connecting plate;3, mounting seat;4, first sound -absorbing spring;5, first damper;6, fixed sliding seat;7, connecting rod;8, limit extrusion board;9, second sound -absorbing spring;10, second damper;11, top mounting plate;12, exhaust fan body;13, first sound -absorbing layer;14, second sound -absorbing layer;15, accommodation cavity;16, built -in sound -absorbing layer;17, microperforated plate sound absorption seat;18, dust removal structure. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0027] In order to facilitate the understanding of the present application, the present application will be more fully described below with reference to the relevant description of the present application, and several embodiments of the present application are given. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Embodiments

[0031] As shown in Figures 1-5 The technical scheme provided by the present application is a comprehensive system, and the core components include an exhaust duct body 1, a placement cavity 15, a built-in sound insulation layer 16, and a buffer and noise reduction structure on the outside.

[0032] The design target is clear, and aims to comprehensively reduce the noise and vibration generated by the laboratory exhaust duct during operation through various technical means and physical principles. This not only creates a quiet and comfortable working environment for the laboratory staff, which is conducive to improving the accuracy and efficiency of experimental operations, but also ensures the stable operation of the exhaust duct system itself, prolongs its service life, reduces equipment failures and maintenance costs caused by noise and vibration, and thus provides strong protection for the normal operation of the laboratory.

[0033] As the basic framework of the entire noise control structure, the exhaust duct body 1 undertakes the key task of conveying exhaust gas and hot air and maintaining indoor air circulation, and is internally designed with a mounting cavity 15, which provides a mounting position for the subsequent built-in sound-absorbing layer 16, so that the sound-absorbing material can fully play its role.

[0034] At the same time, its outer side is closely connected with the buffer and noise reduction structure, and this collaborative design enables the entire system to cope with the vibration and airflow impact generated by the operation of the exhaust fan body 12 from multiple angles, thereby achieving a comprehensive effect of noise reduction and shock absorption.

[0035] The first sound-absorbing spring 4 and the first damper 5 are installed on the mounting seat 3 at the top and bottom of the connecting plate 2 and are directly connected with the exhaust duct body 1. When the exhaust fan body 12 operates at high speed, periodic vibration forces are generated, which are transmitted to the first sound-absorbing spring 4.

[0036] According to Hooke's Law, the spring force (F=kx, where F is the spring force, k is the stiffness coefficient of the spring, and x is the elongation or compression of the spring) is proportional to the elongation or compression. When vibration occurs, the spring will undergo elastic deformation, storing vibration energy through its own elastic potential energy, thereby buffering the vibration and reducing the impact of instantaneous impact force on the duct system.

[0037] At the same time, the first damper 5 begins to play a role. The damper is usually filled with damping medium, such as liquid, gas or special solid material. When the vibration is transmitted to the damper, the damping medium will hinder the vibration of the spring, and the mechanical energy generated by the vibration will be converted into heat energy or other forms of energy through friction, viscosity, etc. and dissipated.

[0038] This process can effectively suppress the resonance phenomenon of the spring, prevent the vibration from continuously amplifying and propagating in the duct system, and prevent the vibration from increasing significantly at a certain frequency, which will seriously affect the stability and service life of the duct system. Through the cooperative work of the first sound-absorbing spring 4 and the first damper 5, the noise caused by the vibration of the exhaust fan body 12 can be effectively reduced, and the relative stability of the duct system can be maintained.

[0039] The fixed sliding seat 6 is firmly installed on the side wall of the connecting plate 2, and the connecting rod 7 works in a sliding connection manner inside the fixed sliding seat 6. When the airflow in the duct is too large, the impact force of the airflow will cause the duct to sway. At this time, the connecting rod 7 will slide relatively in the fixed sliding seat 6. This sliding movement will cause the second sound-absorbing spring 9 at the bottom to deform. The second sound-absorbing spring 9 also absorbs the energy generated by the sway according to the principle of elastic deformation, thereby playing a buffering role.

[0040] The second damper 10, which is matched with the second sound-absorbing spring 9, also plays a role at this time. Through the internal damping mechanism, the second damper 10 converts the mechanical energy in the spring deformation process into heat energy and other forms of energy and dissipates it, further reducing the energy transmission generated by the shaking.

[0041] The limiting extrusion plate 8 is located at the bottom of the connecting rod 7, and the second sound-absorbing spring 9 and the second damper 10 are installed between the limiting extrusion plate 8 and the fixed sliding seat 6. The important role of the limiting extrusion plate 8 is to limit the excessive deformation of the second sound-absorbing spring 9, prevent the spring from losing elasticity or being damaged due to excessive stretching or compression, and thus ensure the stability and reliability of the entire structure.

[0042] Through the coordinated work of this series of components, when the pipeline is shaken by a larger airflow impact, it can quickly respond, through the deformation of the spring and the energy dissipation of the damper, to keep the pipeline in a relatively stable state, effectively reducing the generation and propagation of noise, and ensuring that the exhaust pipe system can still operate stably in a complex airflow environment.

[0043] Rock wool, as a common sound-absorbing material, has a unique porous structure. When sound waves propagate to the surface of rock wool, due to the existence of its pore structure, sound waves will enter the pores inside the rock wool.

[0044] Inside the pores, friction occurs between the air and the rock wool fibers, and sound waves undergo multiple reflections and scattering within the pores. According to acoustic principles, this friction, reflection, and scattering process gradually converts sound energy into heat energy, achieving sound energy consumption and noise reduction effects.

[0045] The pore structure and fiber characteristics of rock wool make it have strong absorption capacity for medium and low frequency noise. The wavelength of medium and low frequency sound waves is relatively long, which can better interact with the macrostructure and larger pores of rock wool. For example, when a medium and low frequency sound wave with a long wavelength encounters a pore in rock wool, it is more likely to enter the interior of the pore and undergo multiple reflection and friction processes within the pore, thereby more fully attenuating sound energy and effectively reducing the propagation of medium and low frequency noise within the pipeline.

[0046] The fibers of glass wool are more elongated and soft, and its internal pores are more fine. When sound waves propagate to the surface of glass wool, they will also enter its pores. Due to the microstructure characteristics of glass wool fibers, sound waves will consume sound energy through friction, adhesion, and other actions within the glass wool.

[0047] Different from rock wool, glass wool has excellent noise reduction effect on medium and high frequency noise. The wavelength of medium and high frequency sound waves is shorter, which can interact more fully with the micro-fiber structure of glass wool. For example, when the shorter wavelength of medium and high frequency sound waves encounters the fine and dense fibers of glass wool, more reflection and absorption processes occur on the surface of the fibers and in the pores, so that the sound energy is rapidly attenuated in these microstructures, thereby effectively reducing the propagation of medium and high frequency noise in the duct. By combining the first noise reduction layer 13 of rock wool material and the second noise reduction layer 14 of glass wool material, effective absorption and reduction of noise can be achieved in a wider frequency range, greatly improving the noise reduction performance of the exhaust duct system.

[0048] As a filling material for the installation cavity 15, the polyurethane foam not only has certain sound absorption performance, but also has a scattering and absorption effect on sound waves due to its internal cellular structure. When sound waves propagate into the polyurethane foam, reflection and scattering occur between the cell walls, and part of the sound energy is consumed in this process.

[0049] At the same time, the polyurethane foam also has good heat insulation and thermal insulation performance. During the operation of the exhaust duct, the temperature of the airflow in the duct may change. If the temperature change is too large and uneven, it will cause an increase in airflow turbulence and vibration. The heat insulation and thermal insulation effect of the polyurethane foam can reduce the heat loss in the duct, helping to maintain the stability of the airflow in the exhaust duct, thereby reducing the airflow turbulence and vibration caused by temperature changes. In addition, the flexibility of the polyurethane foam enables it to buffer the vibration of the duct to some extent, further reducing the generation of noise. From multiple aspects, the built-in noise reduction layer 16 of the polyurethane foam material makes an important contribution to the noise control of the exhaust duct system.

[0050] The top mounting plate 11 is fixedly connected to the laboratory ceiling by a plurality of bolts. This fixing method is of great significance as it can bear the weight of the entire exhaust duct system and its associated equipment, ensuring the stability of the duct in the vertical direction.

[0051] When the exhaust fan body 12 operates and generates vibration and airflow impact, if the duct is not installed firmly, it is easy to produce shaking and displacement, which in turn leads to an increase in noise and damage to the connection parts of the duct. The stable installation of the top mounting plate 11 can effectively prevent the shaking and vibration of the duct due to poor installation, providing a solid foundation for the stable operation of the entire exhaust duct system.

[0052] At the same time, the connection between the connecting rod 7 and the top mounting plate 11 is achieved by welding, which further enhances the overall integrity and stability of the structure, enabling the entire system to maintain a stable structural form when facing various complex working conditions, reducing noise and safety hazards caused by loose structures.

[0053] The exhaust fan body 12 is the power source of the entire exhaust duct system, and the airflow generated by its high-speed operation is the key to achieving exhaust and air circulation. However, the operation of the exhaust fan body 12 inevitably brings about vibration and noise. In order to reduce these adverse effects, a dust removal structure 18 is installed on one side of the exhaust fan body 12.

[0054] The dust removal structure 18 filters out dust particles in the airflow. In a laboratory environment, dust may come from various experimental operations, equipment operation, and external environment, etc. If dust accumulates in the duct, it will block the pores of the sound-absorbing material, reduce the sound-absorbing effect, and also affect the ventilation performance, leading to increased airflow resistance and further increased vibration and noise. Through effective filtration by the dust removal structure 18, the duct can be kept clean, ensuring the normal operation of the sound-absorbing material and the ventilation system, thereby maintaining good noise control effect and ventilation efficiency.

[0055] The micro-perforated panel sound absorption seat 17 is installed on one side of the dust removal structure 18. It utilizes the strong absorption characteristics of the micro-perforated panel sound absorption structure for specific frequency sounds. The micro-perforated panel is a sound absorption structure formed by drilling a large number of small holes in a thin plate. When sound waves propagate to the surface of the micro-perforated panel, complex acoustic processes occur in the small holes and the cavity behind the panel.

[0056] After the sound waves enter the small holes, they consume sound energy through the vibration of the air column in the hole and the friction with the hole wall. The presence of the cavity behind the panel also affects the reflection and absorption of sound waves. By reasonably designing the hole diameter, hole distance, panel thickness, and depth of the cavity behind the panel, the micro-perforated panel can precisely absorb the prominent frequency noise generated by the operation of the exhaust fan.

[0057] In practical applications, the operating frequency of the exhaust fan body 12 usually concentrates in a certain range. Through analysis of these frequencies and optimization design of the micro-perforated panel sound absorption seat 17, these specific frequency noises can be effectively absorbed, further improving the sound-absorbing effect of the entire exhaust duct system, and making the noise environment of the laboratory more precise and effective.

[0058] The working process is as follows:

[0059] When the exhaust fan body 12 starts, the vibration force generated by its high-speed operation is first transmitted to the exhaust duct body 1. At this time, the external buffer noise reduction structure quickly responds, and the first sound-absorbing spring 4 and the first damper 5 begin to work. The first sound-absorbing spring 4 absorbs vibration energy through elastic deformation, and the first damper 5 converts the mechanical energy generated by spring vibration into heat energy or other forms of energy and dissipates it, thereby preliminarily buffering and dissipating energy, effectively suppressing the propagation of vibration, and reducing the noise caused by the vibration of the exhaust fan body 12.

[0060] At the same time, the noise generated by the airflow in the pipeline during the flow process is also being transmitted, when the noise is transmitted to the first sound-absorbing layer 13 (rock wool), the medium-low frequency noise is partially converted into heat energy and consumed due to the porous structure of the rock wool and the good absorption characteristics of the medium-low frequency sound waves.

[0061] Then, the noise carried by the airflow continues to propagate to the second sound-absorbing layer 14 (glass wool), and the medium-high frequency noise is further attenuated under the action of the fine fiber structure and sound absorption mechanism of the glass wool.

[0062] In addition, the installation cavity 15 (polyurethane foam) also plays a buffering and absorbing role for part of the noise and vibration, the cellular structure inside scatters and absorbs sound waves, and its heat preservation and flexibility characteristics help to maintain stable airflow and reduce vibration.

[0063] If the airflow in the pipeline is too large during operation, causing the pipeline to shake, the structure composed of the fixed sliding seat 6, the connecting rod 7, the limiting extrusion plate 8, the second sound-absorbing spring 9 and the second damper 10 will immediately play a role, the connecting rod 7 slides in the fixed sliding seat 6, causing the second sound-absorbing spring 9 to deform and absorb the energy generated by the shaking, the second damper 10 dissipates energy, and the limiting extrusion plate 8 limits the excessive deformation of the spring, thereby further buffering the shaking, stabilizing the pipeline and reducing the noise generated by the shaking.

[0064] During the continuous flow of the airflow, when passing through the dust removal structure 18, the dust is effectively filtered out, keeping the pipeline clean and ensuring the normal work of the subsequent sound-absorbing structure.

[0065] Then, the airflow passes through the micro-perforated plate sound-absorbing seat 17, which precisely absorbs the prominent frequency noise generated by the operation of the exhaust fan body 12 according to its strong absorption characteristics for specific frequency sounds, further improving the sound-absorbing effect of the entire exhaust pipe system.

[0066] Finally, the exhaust gas treated by the above series of noise reduction and shock absorption measures is discharged from the laboratory through the exhaust pipe body 1, thereby realizing efficient noise control and stable operation of the entire laboratory exhaust pipe system, providing a relatively quiet and comfortable working environment for the laboratory, and also ensuring the long-term stable operation and high-efficiency working performance of the exhaust pipe system.

[0067] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A laboratory noise control structure, comprising an exhaust duct body (1), characterized in that: The exhaust duct body (1) has an internal cavity (15) and an internal sound-absorbing layer (16). Several buffer noise reduction structures are also installed on the outside of the exhaust duct body (1). The buffer noise reduction structure includes a connecting plate (2), with mounting seats (3) installed at the top and bottom of the connecting plate (2). Several first noise-reducing springs (4) are symmetrically installed on the two mounting seats (3), and a first damper (5) is installed on each of the several first noise-reducing springs (4). A fixed sliding seat (6) is installed on the side wall of the connecting plate (2). A connecting rod (7) is provided inside the fixed sliding seat (6). A limiting extrusion plate (8) is provided at the bottom of the connecting rod (7). Several second noise-reducing springs (9) are installed between the limiting extrusion plate (8) and the fixed sliding seat (6). A second damper (10) is provided on each of the several second noise-reducing springs (9). A top mounting plate (11) is installed on the top of the connecting rod (7).

2. The laboratory noise control structure according to claim 1, characterized in that: The top mounting plate (11) is fixed to the laboratory ceiling by several bolts, the connecting rod (7) is welded to the top mounting plate (11), and the fixed sliding seat (6) is fixedly connected to the connecting plate (2).

3. The laboratory noise control structure according to claim 2, characterized in that: The two mounting bases (3) and the connecting plate (2) are designed as a single unit. One end of the first silencer spring (4) and the first damper (5) are fixedly connected to the mounting base (3), and the other end is fixedly connected to the exhaust duct body (1).

4. The laboratory noise control structure according to claim 3, characterized in that: The connecting rod (7) is slidably connected to the fixed sliding seat (6), and the connecting rod (7) is fixedly connected to the limiting extrusion plate (8). One end of the second damper (10) and the limiting extrusion plate (8) is fixedly connected to the fixed sliding seat (6), and the other end is fixedly connected to the limiting extrusion plate (8). The limiting extrusion plate (8) does not contact the connecting plate (2).

5. The laboratory noise control structure according to claim 1, characterized in that: The exhaust duct body (1) has a first sound-absorbing layer (13) installed on its four sides, and a second sound-absorbing layer (14) installed inside the first sound-absorbing layer (13).

6. The laboratory noise control structure according to claim 5, characterized in that: The exhaust duct body (1) is equipped with an exhaust fan body (12) inside. A dust removal structure (18) is installed on one side of the exhaust fan body (12), and a number of micro-perforated plate sound-absorbing seats (17) are installed on one side of the dust removal structure (18).

7. The laboratory noise control structure according to claim 6, characterized in that: The first sound-absorbing layer (13) is made of rock wool, the second sound-absorbing layer (14) is made of glass wool, and the placement cavity (15) is made of polyurethane foam.

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