It is the subject of the present invention, as the title of the invention establishes a system to eliminate the noise originated outside of a receptacle, at the inside of that receptacle. For example, such as in the cabin of an airplane where there is excessive noise due to the transmission of noise generated by the engines or by its friction against the air.
It characterizes the present invention the special design and configuration of each and every element that is part of the invention, as well as the functionality assigned to each of them so that working together, they produce a noise suppression system of sound originated at the outside of a receptacle which frequency is from a few hertz to more than decades of kilo-hertz, in a simple and efficient way.
Therefore, the present invention is confined within the scope of the suppressive systems of the transmission of noise within a receptacle.
Within the state of the art there are solutions with active electronic elimination of ambient noise based on sound analysis by means of sound sensors (as microphones) and then generating a similar counterphase sound that counteracts the sound waves of the former eliminating by compensation the former.
The sound, to be transmitted, requires a medium that sustains the transmission of the pressure waves on which it is based. This nature allows the elimination of noise based on the elimination of the medium itself responsible for the transmission of these waves. If we manage to eliminate the medium as well as any other path that may be responsible for the transmission of the sound, we will have managed to stop every sound wave responsible for the noise to be eliminated and in this way the final objective of this invention will have been obtained.
Therefore, it has been chosen to develop systems based on the use of vacuum as a means that prevents the transmission of sound.
In prior art, the use of vacuum as a means of preventing sound transmission is known, as is the case in patent publications CN110410649, CN209467716U, CN108979791, CN107485851. However, in many cases vacuum chambers do not entirely surround the source of the sound or receptacle which you want to protect from sound. In addition, it also happens that they do not have means that allow to maintain in a stable way the separation between the receptacles defined by the vacuum chamber. In some cases, vibration or sound transmission, vibration-absorbing media placed in the separation chamber defined between the receptacles are used, as in patent CN209467716U, or in other cases positional stability between receptacles is achieved by springs as in patent CN209259375U.
In the state of the art the document JP4511450 B2, which discloses a vacuum magnetic levitated vibration absorbing anechoic box which comprises an inner box subjected at its inside to sound-absorbing treatment, an outer box for covering the inner box at its periphery, a neodymium magnet fixed to the outside of the inner box.
However, no document is known to define a system that prevents sound transmission based on the use of the complete vacuum between two receptacles. Without any physical means that may transmit vibrations or sound. Where said vacuum is generated in a chamber that completely surrounds the receptacle to protect from the outside sound and is interposed between the origin of the sound and the receptacle to protect. Where in addition, the means maintaining the positional and dimensional stability of the vacuum chamber can also be controlled at the user's will.
Consequently, it is the object of the present invention to develop a system protective of the transmission of sound within a receptacle that has the above characteristics as described below and is included in its essentiality in the first claim.
It is the subject of the present invention a system to eliminate noise of sound inside a receptacle and comprising:
Unless otherwise indicated, all the technical and scientific elements used in this report have the meaning usually understood by a normal expert in the technique to which this invention belongs. In the practice of the present invention, procedures and materials similar or equivalent to those described in the memory may be used. Throughout the description and claims the word “understands” and its variants are not intended to exclude other technical characteristics, additives, components or steps. For experts in the field, other objects, advantages and characteristics of the invention will be detached in part from the description and partly from the practice of the invention.
To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization, it is accompanied, as an integral part of that description, a set of drawings in which, for illustrative and not limiting purposes, the following has been represented.
In
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In the light of the figures, a preferred method of realization of the proposed invention is described below.
In
This first receptacle is hermetic as it does not allow any fluid to pass through any of its faces, edges or vertices, any fluid, whether liquid or gaseous, since it is the receptacle inside which the suppression of sound noise will occur by avoiding the passage of waves from the outside. The walls are rigid and light, and in a possible form of realization can be honeycomb walls with materials that allow sufficient rigidity to prevent the opposite faces of the different receptacles from coming into contact.
Completely surrounding the first receptacle (1) or inner receptacle is a second receptacle (2) or outer receptacle that may have a similar shape, hexahedral or cubic and must be also hermetic.
The faces of both receptacles will generally be parallel as a first step to minimize the space or volume between them. The space between the two receptacles, the first receptacle (1) and the second receptacle (2), defines a chamber (3) where the vacuum is to be performed, up to a level at which the sound transmission is very highly attenuated and therefore inaudible. Vacuum in the chamber (3) is done by means of an extraction system. A possible form of realization for it is a vacuum pump (5).
Finally, the system has means of maintaining the separation (4) between receptacles based on electromagnetic means controlled from the outside and at will, such electromagnetic means are arranged in a face-to-face manner, so that a first (or all) electromagnetic medium (4.1) is placed on the outer face of the first receptacle (1) and a second electromagnetic medium (or set) (4.2) is placed on the inner face of the second receptacle (2) so that they can produce a magnetic repulsion between the two, which ensures the dimensional stability of the vacuum chamber (3) and therefore the separation between the first receptacle (1) and the second receptacle (2). Electromagnetic fields can be permanent or variable by passing a current through a set of coils. In a preferred first implementation, repulsion forces can be created with high-value permanent magnets or by high-strength electromagnets or by permanent high-strength magnets combined with high-strength electromagnets. Such magnets must be faced between them, either individually or in groups, to create high repulsion points or high repulsion zones between the inner and outer receptacles with sufficient forces to compensate for inertia and weights depending on the face or surface of the receptacles concerned.
When gases are extracted between the two receptacles with an adequate vacuum subsystem, the composite system will produce the desired effects and allow the exclusion of sound waves by preventing them from passing from the outside to the inner receptacle.
In addition, the system may also comprise one or more pressure sensors that allow the control and supervision of this magnitude in referred receptacles and the separation chamber between them.
Sufficiently described the nature of the present invention, as well as the way in which it is implemented, it is stated that, within its essentiality, it may be implemented in other forms of realization that differ in detail from that indicated by way of example, and to which it will also achieve the protection that is sought, provided that it does not alter, change or modify its fundamental principle.
Filing Document | Filing Date | Country | Kind |
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PCT/ES2021/070136 | 2/25/2021 | WO |