Acoustics products of Fujian Yu Lang Environmental Protection Technology Co., Ltd.

1. Overview of sound absorption and sound insulation barrier (LY-GPA) products:

The lower part of this sound barrier adopts sound insulation unit components and the upper part adopts sound absorption unit components, which has high strength, light weight, beautiful appearance, good acoustic performance and low cost.

The upper part of the sound barrier is composed of sound-absorbing plate members, and the sound-absorbing plate structure is an inner metal perforated plate (louver hole or plane round hole), and the rear guard plate is a non-perforated metal steel plate, and the metal plate is a galvanized steel plate or an aluminum alloy plate. It is filled with sound-absorbing cotton and sound-proof damping felt board, and covered with rain-proof and moisture-proof glass fiber cloth. The lower part is a component unit with only sound insulation and no sound absorption, and the structure is a color steel sandwich panel. The thickness of the sound barrier plate is 100m. This structure has high strength, light weight, beautiful appearance, good sound absorption and sound insulation performance and low cost.

2. Overview of Fully Absorbed Sound Barrier (LY-GPB) products:

This kind of sound barrier is composed of all sound absorption unit members, with high strength, light weight, beautiful shape and good sound absorption and sound insulation performance (the average sound insulation capacity is greater than 35dB and the average sound absorption coefficient is greater than 0.85).

This kind of sound barrier is composed of all sound-absorbing unit members, and its sound-absorbing plate structure is internal metal perforated plate (louver hole or plane round hole), and the rear guard plate is non-perforated metal steel plate, and the metal plate is galvanized steel plate or aluminum alloy plate. It is filled with sound-absorbing cotton and sound-proof damping felt board, and covered with rain-proof and moisture-proof glass fiber cloth. The thickness of the sound barrier plate is 100 mm, and at the same time, in order to make the sound barrier beautiful and corrosion-resistant, the surface of the sound barrier is treated with anti-corrosion and sprayed with plastic. This structure has high strength, light weight, beautiful appearance and good sound absorption performance. The average sound insulation capacity is greater than 35dB, and the average sound absorption coefficient is greater than 0.85.

3. Overview of LY-GPC products:

The upper and lower parts of this sound barrier are sound-absorbing unit members, and the middle part is transparent sound-absorbing unit members to achieve better visual effects, so that the structure can be disassembled or opened as needed.

Performance characteristics:

In order to improve the visual effect, the sound barrier adopts a transparent structure in the middle, and the upper and lower parts are still sound-absorbing unit members. The material and structure of the sound-absorbing unit are the same as those of the sound-absorbing board. The transparent structure in the middle is: the transparent part is made of safe and transparent PC resistance board or safety glass or sunshine board with specified chromaticity, and the outer frame is made of galvanized steel plate or aluminum alloy, which is easy to disassemble and turn over.

4. Overview of fully transparent sound barrier (LY-GPD) products:

This kind of sound barrier adopts fully transparent sound insulation unit components, which has good acoustic performance and landscape visual effect.

Performance characteristics:

The transparent structural material of this sound barrier is: the transparent part adopts safe and transparent PC resistance board or safety glass or sunshine board with specified chromaticity, the outer frame adopts galvanized steel plate or aluminum alloy, and the surface of the outer frame adopts anti-corrosion treatment and plastic spraying surface.

5. Overview of sharp crack sound barrier (LY-GPE) products: This kind of barrier adopts "sharp crack" full sound absorption components, and by increasing the sound absorption area, the sound absorption coefficient of each frequency band and the overall sound absorption effect of the barrier are improved.

Performance characteristics:

The height of road noise barrier is generally 2-4 meters, mostly 3-4 meters. Sound absorption structure,1-4m, full sound absorption type, louver opening; There is also a semi-sound absorption type, only the upper part absorbs sound, and the lower part does not open blinds; In order to increase the sound absorption effect and its sound absorption area, it has a "wedge" sound absorption type with high sound absorption and long frequency bandwidth.

6. Overview of composite cement sound barrier (LY-GPF) products:

This kind of sound barrier takes porous wood fiber concrete block as sound absorption and sound insulation unit, and the block is made of cork graded wood chips as raw materials. After special chemical treatment, it is mixed with cement in a certain proportion, and then solidified and hardened by molding. It has excellent sound-absorbing and sound-insulating properties, and also has fire-proof and heat-insulating functions. Can be used in hot, cold, humid, drought and other harsh climatic conditions and environments.

Performance characteristics:

This kind of sound barrier takes porous wood fiber concrete block as sound absorption and sound insulation unit, and the block is made of cork graded wood chips as raw materials. After special chemical treatment, it is mixed with cement in a certain proportion, and then solidified and hardened by molding. It has excellent sound-absorbing and sound-insulating properties, and also has fire-proof and heat-insulating functions. Can be used in hot, cold, humid, drought and other harsh climatic conditions and environments.

Design criteria:

Code for acoustic design and measurement of HJ sound barrier /T90-2004

"reverberation room method-specification for measurement of sound absorption coefficient" GBJ47-83

Code for Measurement of Building Sound Insulation GBJ75-84

Code for Design of Steel Structures GBJ 17-88

Code for Construction and Acceptance of Steel Structures (GB50205-200 1)

Standard for quality inspection and evaluation of steel structure engineering GB5022 1-95

Code for Design of Highway Environmental Protection (JTJ/T006-98)

Technical Requirements and Test Methods for Acoustic Components of Railway Noise Barrier (TB/T 3 122-2005)

Scope of application:

Civil equipment

High-speed railway

Industry, enterprise and factory boundaries

Industrial equipment 1, soundproof door

Product overview:

Sound-proof doors can be divided into all steel, aluminum alloy, stainless steel and other materials, and can be divided into two types: double doors and single doors. The opening forms are push-pull type and flat type. Users can choose according to their own needs. If there are special needs, our company can be responsible for design and manufacturing. Using centrifugal glass wool and damping composite sound-absorbing and sound-insulating materials and structures filled in the door cavity, the sound-insulating door has good sound-insulating performance in all frequency bands; The sound-proof door adopts special locks and hardware, which not only has good sound-proof performance, but also ensures certain anti-theft performance.

Scope of application:

It is suitable for halls with high requirements for acoustic environment, such as recording studios and studios of radio and television stations, gymnasiums, theaters, auditoriums, conference rooms, lecture halls, etc. Suitable for high-noise workshops and equipment rooms, such as industrial workshops, air-conditioning rooms, generator rooms, refrigeration rooms, fan rooms, boiler rooms, etc. Other places with special sound insulation requirements such as entertainment places, laboratories, computer rooms and other civil buildings.

Our advantages:

The surface can be sprayed or glued, and a variety of colors can be selected. The hinge with bearing is easy to open, and the electric, pneumatic and hydraulic opening modes can be customized according to the actual situation. The door lock adopts self-sealing device and adopts EPDM sealing strip with high quality and environmental protection. High machining precision and good sound insulation effect.

Materials and accessories:

The surface can be sprayed or veneered, and various colors can be selected;

The door cavity is filled with centrifugal glass wool and damping composite sound absorption and insulation materials and structures to ensure good sound insulation performance in all frequency bands;

The hinge with bearing is easy to open, and the opening modes such as electric, pneumatic and hydraulic can be customized according to the actual situation;

The door lock adopts self-sealing device, and adopts high-quality and environmentally-friendly EPDM sealing strip, special lock and hardware to ensure anti-theft performance.

2, soundproof window

Product overview:

LYC-D closed sound insulation window is used in some special places, such as machine room, operation room, central control room, recording studio and studio of industrial buildings. These places have high requirements for sound insulation, but there is no ventilation requirement. This kind of soundproof window is made of reinforced sound insulation glass, with special window frames and professional seals to form an unopened closed soundproof window. This kind of window glass is twice as thick as ordinary soundproof window, and can generally achieve sound insulation effect of more than 45 decibels, with noise reduction performance of more than 95%.

operating characteristic

At present, the existence of high decibel noise has become an increasingly prominent common problem in people's lives. Throughout the construction market, the best buildings are often built in busy and noisy areas, which brings convenience and speed to users in transportation, shopping and life, but also brings noise troubles. At the same time, with the construction of expressway, railways and airports, traffic noise is becoming more and more serious.

Sound waves have strong penetration and thick walls have good sound insulation performance, but door and window glass often becomes the weakest link to block noise. The sound insulation capacity of the soundproof window produced by our company reaches 30-45 decibels, especially the traffic noise with concentrated noise energy of 400-800 Hz.

LYC enclosed sound insulation windows are used in some special places, such as computer rooms, operation rooms, central control rooms, recording studios and studios of industrial buildings and public buildings. These places have high requirements for sound insulation, but no ventilation requirements. This kind of soundproof window is made of reinforced sound insulation glass, with special window frames and professional seals to form an unopened closed soundproof window. This kind of window glass is twice as thick as ordinary soundproof window, and can generally achieve sound insulation effect of more than 45 decibels, with noise reduction performance of more than 95%.

Structural form:

1. The window frame is made of special aluminum alloy, plastic-steel profile, aluminum-plastic composite and cold-rolled steel plate;

2. The sealing element adopts foamed EPDM sealing strip, which has good flexibility, elasticity and aging resistance;

3. Adopt imported professional hardware.

Specification and model: unit (mm) is 900 6001200 90014001200150016001800 65438.

GBJ87-85 Code for Design of Noise Control in Industrial Enterprises,

GBJ 1 18-88 code for sound insulation design of civil buildings

GB/T 8485-2002 "Classification and test method of air sound insulation performance of building external windows"

Scope of application:

Industrial construction

Public building equipment room

operating room

central control room

sound studio

Studio product overview:

Vibration isolator is a kind of elastic supporting element, which is an independent and self-sufficient device made by special design. The most commonly used isolators are divided into metal spiral spring isolators, rubber isolators, wire mesh isolators, metal rubber composite isolators and air spring isolators.

Scope of application:

According to different types and performance, it is suitable for hoisting and vibration reduction of various pipes and fan coils, fresh air units, variable air volume air conditioning boxes, axial fans, etc. Or punching machine, forging press and other impact machines. It is an ideal method for vibration isolation, noise reduction, vibration pollution control and environmental protection. Product overview:

Yulang LYX series perforated sound-absorbing and sound-insulating board is an integral sound-absorbing and sound-insulating structure with perforated board on the front, sound-absorbing cotton filled inside and metal plate on the back. According to the acoustic principle, reasonable collocation of perforated sound insulation board not only has excellent noise reduction and sound absorption performance (NRC≥0.95), but also has good sound insulation performance. The sound insulation effect of the original wall will be greatly enhanced when it is used in conjunction with the original wall (the keel is installed on it to form a hollow composite sound insulation structure).

Product features:

The sound absorption part of LYX series perforated sound absorption insulation board adopts fiber porous sound absorption materials, mainly centrifugal glass wool and rock wool. The sound absorption mechanism of porous sound-absorbing materials is that there are a large number of tiny connected pores in the material, and sound waves can penetrate into the material along these pores and rub against the material to convert sound energy into heat energy. The sound absorption characteristic of porous sound-absorbing materials is that the sound absorption coefficient increases gradually with the increase of frequency. According to the requirements of different occasions, one or two layers of cotton can be used for sound-absorbing and heat-insulating panels.

The punched panel of sound-absorbing and heat-insulating board is made of metal plate with the thickness of 0.6~ 1.5mm (or different thickness according to user's requirements), and the material can be galvanized steel plate, stainless steel plate or aluminum alloy plate according to user's requirements.

The sound absorption effect is good, and the measured NRC value is greater than 0.95.

Good thermal insulation performance, as a partition and ceiling, can prevent outdoor heat from directly entering the room, and effectively use and save energy.

Good physical stability, will not expand and contract due to temperature and temperature changes.

High strength, can withstand external impact and will not be deformed and broken.

There is no need for decorative surface layer and auxiliary materials, and the assembly can be completed through simple operation, which can reduce the total cost and construction period of the project.

Simple maintenance, easy dust removal and direct surface scrubbing.

The surface is plastic-sprayed, with a variety of modern colors to choose from, and the corresponding colors can be adopted according to the customer's needs.

Scope of application:

Sound absorption and noise reduction construction in airports, railways, bus stations, factories and workshops;

Sound absorption and sound insulation construction of conference rooms, office buildings, halls and hotels;

Sound effect construction of studios, recording studios, theaters, cinemas, indoor sports venues, bars, KTV and other ornamental and entertainment buildings.

Sound absorption and noise reduction construction in airports, railways, bus stations, factories and workshops;

Sound absorption and sound insulation construction of conference rooms, office buildings, halls and hotels;

Sound effect construction of studios, recording studios, theaters, cinemas, indoor sports venues, bars, KTV and other ornamental and entertainment buildings. Product overview:

Sound-absorbing wedge is an acoustic component equipped in anechoic chamber and semi-anechoic chamber, which is designed and manufactured according to the acoustic index of anechoic chamber design.

The sound-absorbing wedge structure is a frame made of steel bars with a certain thickness, which conforms to the design shape and size. Protective materials are sewn on the frame and evenly filled with porous sound-absorbing materials. The sound absorption principle of sound absorption wedge is that when sound waves are incident from the tip, the acoustic impedance of the material can be well matched with that of air due to the gradual transition of the sound absorption layer, so that sound waves can be transmitted into the sound absorber and absorbed efficiently. The sound-absorbing wedge consists of three parts: the tip, the base and the cavity. Its sound absorption characteristics are related to the length of the wedge, the length ratio of the tip to the base, the cavity between the wedge and the rigid surface and the material density. The longer the wedge, the better the low-frequency sound absorption performance.

Scope of application:

It is mostly used in microphone calibration, electroacoustic instrument testing, language and auditory acoustics testing and research, and measurement of acoustic characteristics of various sound sources (such as sound power, spectrum, directivity, etc.). ), and other research work to avoid the interference of reflected sound or external noise. Product overview:

There are many kinds of blinds. On the one hand, louvers used in noise control should be ventilated to dissipate heat, on the other hand, they should be silenced and sound-insulated, so as to reduce or isolate noise from spreading outward. Acoustic louvers are mostly used in fresh air inlet of ventilation system, return air outlet of corridor, ventilation and noise elimination of cooling tower, air conditioning of sound barrier vent, vent of cooling device and many other occasions.

Product features:

Control the outward radiation of noise to achieve good noise elimination effect.

Meet the ventilation, heat dissipation, lighting and enclosure of the system.

Adjustable shutter thickness or blade spacing, overall beautiful and elegant.

Scope of application:

It is suitable for the air return port of the machine room without air return pipe or the air return port at the end of the pipe in the ventilation and air conditioning system.

It is suitable for the computer room with sound insulation function with opening and ventilation requirements in adjacent rooms.

Suitable for refrigerators, cooling towers, diesel generator sets, etc.

It is suitable for the air return port of the machine room without air return pipe or the air return port at the end of the pipe in the ventilation and air conditioning system.

It is suitable for the computer room with sound insulation function with opening and ventilation requirements in adjacent rooms.

Suitable for refrigerators, cooling towers, diesel generator sets, etc. Product overview:

Sound insulation room is an acoustic product to prevent external noise from entering the room or equipment noise from interfering with the outside world. It is designed according to the noise reduction requirements of the site, and provides various support components such as ventilation, lighting and detection.

With China's entry into WTO, more and more enterprises export products in large quantities, and the requirements for product quality are getting higher and higher. In order to make their products meet the international standards, many electronic enterprises and manufacturers specializing in the production of motors need to control the noise generated in the process of product operation, and the demand for sound insulation rooms and silent detection rooms is increasing.

Classification and introduction of sound insulation room

1. Sound insulation room (equipment noise reduction)

Due to the large size of the machine, frequent equipment maintenance and manual operation, at this time, only a large room can be used to enclose the machine and set up doors, windows and ventilation pipes. This soundproof room is similar to a big soundproof cover, except that people can enter the room.

2. Control room and lounge

Isolate a quiet environment in a noisy environment and use it as a control room or lounge.

3. Quiet testing room (providing low-noise testing environment)

The mute detection room is the workshop of detection equipment, which can be a movable mute room. The quiet room adopts sound absorption on four sides and the top surface, and sound insulation on the bottom floor to realize indoor low noise environment. The noise level in the quiet room is less than 35dB(A) (designed according to the noise level of the outdoor environment). In addition to sound insulation and sound absorption system, the quiet room also needs to be equipped with sound insulation doors, windows, ventilation and noise elimination systems, electrical systems, etc. Product overview:

Muffler is a kind of silencing equipment which can prevent sound from spreading and let air pass, and prevent aerodynamic noise. The selection of muffler should be based on the requirements of fire prevention, moisture-proof, anti-corrosion and cleanliness, installation space, spectrum characteristics of noise sources, natural sound attenuation of the system, regenerative noise of system airflow, allowable indoor noise level, allowable pressure loss and many other factors. The product has been used by the majority of users, and the noise elimination effect is good, and the noise elimination amount can reach 35dB.

Product features:

Simple structure, wide noise elimination frequency band, small pressure loss, no dust when working, no fear of oil mist and moisture, high temperature resistance and high-speed airflow impact, low regeneration noise and so on.

Scope of application:

Suitable for blowers, induced draft fans, axial fans, centrifugal fans and roots fans.

Suitable for all kinds of exhaust venting of medium and high pressure steam boilers, industrial boilers and air compressors.

Suitable for sintering fan, blast furnace gas pressure reducing valve, blast furnace cold fan, dust removal fan and combustion-supporting fan.

Suitable for ventilation and noise elimination pipes of various air conditioning equipment.

Suitable for all kinds of generator exhaust muffler pipes.

Suitable for blowers, induced draft fans, axial fans, centrifugal fans and roots fans.

Suitable for all kinds of exhaust venting of medium and high pressure steam boilers, industrial boilers and air compressors.

Suitable for sintering fan, blast furnace gas pressure reducing valve, blast furnace cold fan, dust removal fan and combustion-supporting fan.

Suitable for ventilation and noise elimination pipes of various air conditioning equipment.

Suitable for all kinds of generator exhaust muffler pipes. Product overview:

Hearing testing room (audiometry room) is an acoustic product that provides the required acoustic environment for hearing testing. It is designed and built according to the requirements of national standards for different test conditions. Product description and technical introduction of medical electric audiometry room;

The human ear's hearing threshold for a specific sound will be improved because of the existence of other sounds, which is the masking phenomenon. In order to ensure the accuracy and reliability of the hearing test results, the hearing test should be carried out in the hearing test room. Different hearing tests have different requirements for the environmental noise of the hearing test room.

1, sound insulation

Environmental noise has a direct impact on the results of listening test. The noise near the outpatient hall often reaches 60dB to 80dB, so the sound insulation capacity of the hearing testing room should not be less than 50dB. The sound insulation effect of hearing testing room is a key problem in design and construction. Moreover, the sound insulation effect of sound insulation doors and windows (observation windows) should also be guaranteed to be good.

The outdoor wall of the listening test should be smooth to increase the reflection of sound. Generally, the inner wall and top surface are made of porous sound-absorbing materials, and carpets are laid on the ground to improve sound-absorbing performance and reduce reverberation time.

2. Ventilation equipment

Because of the need of sound insulation, hearing testing rooms often adopt closed buildings, and generally do not provide windows for lighting and ventilation, and the doors leading to the outside are also soundproof and airtight. In this layout, the room should be ventilated to maintain good air quality. The air supply and exhaust pipes have good sealing performance, are equipped with impedance silencers and muffling elbows, and are connected with the air supply and exhaust ports reserved on the top plate through flexible joints.

3. Lighting and others

Indoor lighting should use lamps that are not started by ballasts or lamps that do not make noise when used. At the same time, the air conditioning system should be configured as required, but other systems should be noise-reduced or set.

Acoustical standard for determination of pure tone air conduction hearing threshold GB/T 7583-87

Product overview GB/T 16403- 1996, Pure tone air conduction and bone conduction audiometry;

It is mainly used for microphone calibration, electroacoustic instrument testing, language and auditory acoustics testing and research, and measurement of acoustic characteristics of various sound sources (such as sound power, spectrum, directivity, etc.). ), and other research work that needs to avoid the interference of reflected sound or external noise. The background noise of anechoic chamber can be less than 20dB.

Description and types of anechoic chamber products:

Anechoic room refers to a room with free sound field, that is, only direct sound has no reflected sound. In fact, it can only be said that the smaller the reflection sound of the anechoic room, the better. In order to get the effect of free sound field, it is necessary that all six surfaces in the room have high sound absorption coefficient, and the sound absorption coefficient should be greater than 0.99 in the use frequency range. Usually the silencing wedge is laid on six surfaces, and the steel rope net is installed on the silencing wedge on the ground.

Another structure is a semi-anechoic chamber, the difference is that the floor is not treated with sound absorption, but paved with tiles or terrazzo to form a mirror. This anechoic structure is equivalent to half of the anechoic chamber with twice the height, so we call it a semi-anechoic chamber.

Main ingredients:

Sound insulation structure in the room;

Vibration isolation floating floor;

Sound absorption wedge;

Acoustic door;

Muzzle ventilation and silencing system;

Lighting, safety monitoring and other systems;

Acoustic sound pressure method for measuring the sound power of noise sources Precision methods of anechoic chamber and semi-anechoic chamber GB/T 6882-2008 1, Diesel engine sound insulation cover This product is a movable sound insulation cover customized for small diesel engines, providing a good sound environment for communication engineering maintenance, emergency power supply and other places.

2. Telephone soundproof cover

Install telephone soundproof covers on communication equipment such as telephones and intercom terminals in noisy factories. The soundproof enclosure should be able to effectively reduce external noise, so that field workers can use communication equipment smoothly in the soundproof enclosure. 3. Sound insulation cover of natural gas supercharger

The sound insulation cover of natural gas booster is a customized product for natural gas booster (or air compressor) in cities and factories. Under the premise of ensuring the normal operation of the unit, the sound insulation cover provides a good acoustic environment for the surrounding area.