First、Project introduction
Zhejiang lonsid healthy drinking water equipment co., LTD. Is a large enterprise specializing in the design, development, production and sales of healthy drinking water equipment. Founded in December 2009, the company was reorganized by the former lang shide electrical appliances branch. In May 2015, IDG capital invested in longshide, and the company’s registered capital increased to 1058184.14 million yuan. At present, longshide has built an industrial park of more than 240 mu in shangyu, aiming to build the largest industrial base of healthy drinking water equipment in China. Through years of efforts, the company has established a domestic first-class research and development center and testing center with advanced experimental equipment. The company has passed ISO9001, ISO14001, OHSAS18001 certification; Its products have passed CCC, CE, CB and other domestic and foreign authoritative certification, and have been issued by the national health authorities and a number of domestic and foreign patents, sell well at home and abroad.
The company always adheres to the customer service idea of "home products and service start", which makes longshide’s popularity and reputation in the industry keep rising and become a trustworthy brand for consumers at home and abroad. Companies from the perspective of people’s drinking water health, in-depth understanding of customer needs, make full use of the water treatment aspects of scientific research and technological advantages, humanized design, developed by ultrafiltration straight drink machines, pipeline direct drinking machine, the public direct drinking machine, water machine, water purification machines, reverse osmosis pure water machine, and many other series of products applicable to different market demand.
In order to devote oneself to the water dispenser noise experiment detection, thus seeks the scientific solution to adjust the noise to provide the accurate data. Zhejiang lanshide health drinking water equipment co., LTD signed a contract with our company (Thunderstar anechoic technology,Inc) to purchase the testing water dispenser semi-anechoic room.
Second、Project requirements
Product content:
Party b shall be responsible for the design and installation of the installation project plan and the use materials of the semi-anechoic chamber. Party b shall apply all or part of its "turbocharged microcirculation frequency conversion anechoic ventilation" (patent no. : 200520108948.5) to the installation project construction of party a’s semi-anechoic chamber.
1) The effective net size inside the semi-anechoic chamber installation project: 2000m (L) × 2000mm (W) × 2000mm (H), the external effective dimensions after fabrication are: 4000mm (L) × 4000mm (W) × 3210mm ( H);
2)The installation project of the semi-anechoic chamber installs 8 professional non-echo and non-noise lighting lamps, and the 6 second and third sockets are extended accordingly to the concave shape interior suitable for use of the sound absorbing anechoic cone.
3)3) Personnel access door size: W × H = 1.0 × 1.9 (m);
Semi-anechoic chamber product acceptance main terms:
In the absence of external abnormal interference, the noise floor is ≤15dB (A);
The semi-free sound field sound pressure level is in accordance with the inverse flat method, the theoretical value and the measured maximum allowable deviation index.
Third、Acoustic design
1. Sound insulation design realizes background noise index
2. Sound absorption design realizes the performance of semi-free sound field
3. The silencing design realizes the aerodynamic performance
Forth、On-site production and construction
Fifth、On-site measurement and acceptance
Sixth、Test Results：
1. When the compressor unit is 1.5m away from the semi-anechoic chamber, the environmental noise value Len(A)=71.9dB(A), the indoor noise floor value Lgn(A)=17.9dB(A);
2. When the compressor unit at a distance of 1.5m from the semi-anechoic chamber is not working, the environmental noise value Len(A)=45.2dB(A), the indoor noise floor value Lgn(A)=16.0dB(A);
3. Performance of semi-free sound field: 1/3 octave band analysis is performed in the frequency range of 100 Hz to 20 kHz, and the spatial pressure of the sound pressure emitted by the test sound source is attenuated, and the sound pressure is inversely proportional to the square of the distance in the ideal semi-free sound field. The attenuation of the law is compared with the deviation of the law within the maximum allowable deviation.
The detailed manufacturing process, construction process and acceptance technical specifications of the above complete sound elimination room manufacturing and construction installation can be downloaded to the download center of the company’s official website for free, or please scan the company’s WeChat public service code for free promotion.
