Soundproof cabin knowledge
[Hong Kong Soundproof Cabin] Mobile soundproof room, air-conditioning and ventilation problems, full record of solutions
Mobile soundproof room
The sound insulation cabin is a new sound insulation product, which utilizes the sound insulation principle of the traditional room in box (box in box) to effectively provide people with a quiet environment to work and rest.
The following records how we solve various existing problems and introduce them into Hong Kong housing.
(The picture below is the showroom of the Mongkok store)
The problem of transporting the soundproof cabin upstairs
In order to introduce this product, the first thing we have to solve is the problem of transporting upstairs.
The mobile soundproof rooms on the market are not designed for Hong Kong buildings, and their height can no longer be placed in a residence with a ceiling height of 8 feet.
Moreover, the elevators in Hong Kong are very thin, and goods cannot enter the elevator. Therefore, we need to redesign, modularize this product, and make additional models, so that each accessory can be successfully entered into the elevators in Hong Kong.
(In 2023 in the picture, it is a photo of receiving goods from a residential customer in North Point)
Ventilation problems in soundproof rooms
Well, after solving the transportation problem, the next step is the most difficult technical problem. There are three problems in the soundproof cabins on the market:
1. Using a small fan, the carbon dioxide content in the room is seriously exceeded:
This is the method that most soundproof room factories will use.
Actually this kindwindThe fan is the same kind that our computers use to dissipate heat.
As everyone can imagine, even the box of the main computer is less than half a square foot.
It can't dissipate too much heat, let alone such a large soundproof box.
(The picture below is usingIn the case of a small fan, after sitting for 5 minutes, the carbon dioxide content has reached 1500ppm)
Note: 1000ppm is the international standard, I can hardly breathe after sitting for 5 minutes, stop the test
2. Use a large exhaust fan with a large air inlet, and the sound insulation is less than 20 dB;
Some soundproof cabins are directly equipped with large exhaust fans. This does not require data, but it can be imagined with common sense that opening a hole larger than a basketball in a soundproof room has lost the meaning of soundproofing.
3. Use a powerful fan, the wind noise and motor sound are very loud.
Some factories use powerful exhaust fans and open a small hole for ventilation.
Although the problem of fresh air and sound insulation has been solved, another problem has arisen, which is the very noisy motor sound, the noise is as high as more than 60 decibels, just like being in a factory.
(The picture below shows a visit to the sound insulation parts testing room of Shanghai Tesla Super Factory)
The core problem of mobile soundproof room
We have visited almost all domestic factories that manufacture this product, and none of them can solve this problem at the same time.
Therefore, the core problem is ventilation. It can be ventilated, but not soundproof. If the fan is too big, the wind noise will be very loud.
The core question is,We want to create a ventilation system that can be sound-proof, fresh enough, and quiet.
In order to solve this problem, we conducted research from various angles.
Fortunately, two generations of the store manager's family are engineers working for the developer, and only the store manager comes out to make music.
The second brother is the ventilation consultant of New World Development and provided valuable advice.
Later, because of the recommendation of an engineering friend,I went to Shanghai Tesla's super factory to test the soundproof room with reference to their parts, and learned from them their manufacturing process and materials used.
With the help of these recommendations, we carried out extensive testing and experimentation to determine the optimum soundproof cabin design and ventilation system.
go through18months of research,40After many tests, we can finally do it, the carbon dioxide content is less than1000ppm, less wind noise than30dB, and the sound insulation exceeds30dB。
How the system is designed, I won’t say much, just look at the results:
(The picture below is an 8-hour test, and the carbon dioxide content is only 612-779 ppm)
This innovative ventilation system not only keeps the indoor air fresh, but also avoids excessive carbon dioxide levels in the room.
Soundproofing materials and soundproofing structures to minimize disturbance from outside noise. And the noise and vibration of the machine are above the standard.
(The picture below is the display of the Mong Kok store, taken in a soundproof room)
Legislative standards for soundproof cabins
Is it necessary to achieve 700ppm? In fact, not necessarily, even if the brain is hypoxic below 2000ppm, there will be no immediate danger to life, and there is no clear regulation on this emerging product.
However, it is our principle that a product must be safe and effective before we can sell it.
Residential upstairs noise is a type of structure-borne noise that is caused byresonance effectcaused by.
When audio travels through an object, the object resonates, causing noise.
In residential buildings, this resonance is due to the phenomenon that noise from the upper floors is transmitted through the structure of the building to the rooms on the lower floors.
However, installing soundproof ceilings cannot effectively solve this problem.
Because structure-borne noise is caused by the structure of the entire building, not just the ceiling.
Therefore, installing a soundproof ceiling can only reduce a small amount of noise, but it cannot completely eliminate it.
The only effective solution is the "room within a room" approach.
This approach involves separating the structure of a building to prevent the transmission of noise through structural vibrations.
A room within a room can be implemented in two ways:
1. Room decoration in soundproof room
This method is very expensive and time-consuming, and is often used in concert halls and theaters.
2. Modular house within a house
Millions of renovations can be solved with tens of thousands of yuan,Click the link for reference：
In short, the noise problem in residential buildings is caused by the resonance effect. The installation of soundproof ceilings cannot solve this problem. The only effective solution is the "room within a room".