Silencing equipment for electric devices

Abstract

Silencing equipment provided with one or more flow channels through which cooling air flows has a flow channel forming member that forms the flow channel, and an acoustic absorbent member that is fixed to the flow channel forming member. A resonance type silencer is formed on a wall surface of the flow channel by providing a cavity for the resonance type silencer in the acoustic absorbent member and an aperture for the resonance type silencer in a portion of the flow channel forming member. The resonance type silencer sets a frequency of noise necessary to be reduced based on a peak frequency of noise generated by a fan. The silencing equipment further has a slide member which slides by a slide mechanism to adjust the area of the top of the aperture. The silencing equipment for electronic devices capable of cooling heat generating sections thereof with air has a small and simple structure and can improve a silencing effect by blowing air.

1 . Silencing equipment for electronic devices, the silencing equipment being adapted to be installed to an electronic device having a fan that blows cooling air to cool a heat generating section, the equipment comprising:
 a flow channel forming member that forms a flow channel through which the cooling air flows; and   an acoustic absorbent member that is fixed to the flow channel forming member;   wherein an aperture is provided in a portion of the flow channel forming member,   a cavity communicating with the aperture is provided in the acoustic absorbent member, and   the aperture and the cavity form a resonance type silencer on a wall surface of the flow channel by making a cross sectional area of at least one part of the cavity larger than that of an interface between the aperture and the cavity.   
   
   
       2 . The silencing equipment according to  claim 1 , further comprising:
 a slide member provided on the top of the aperture to adjust the area of the top of the aperture by sliding by means of a slide mechanism.   
   
   
       3 . Silencing equipment for electronic devices, the silencing equipment being adapted to be installed to an electronic device having a fan that blows cooling air to cool a heat generating section, the silencing equipment comprising:
 a flow channel forming member that forms a flow channel through which the cooling air flows; and   an acoustic absorbent member that is fixed to the flow channel forming member;   wherein an aperture is provided in a portion of the flow channel forming member, and   a cavity communicating with the aperture and formed by bending the flow channel forming member is provided in the acoustic absorbent member,   the aperture and the cavity form a resonance type silencer on a wall surface of the flow channel by making a cross sectional area of at least one part of the cavity larger than that of an interface between the aperture and the cavity.   
   
   
       4 . The silencing equipment according to  claim 3 , further comprising:
 a slide member provided on the top of the aperture to adjust the area of the top of the aperture by sliding by means of a slide mechanism.   
   
   
       5 . Silencing equipment for electronic devices, the silencing equipment being adapted to be installed to an electronic device having a fan that blows cooling air to cool a heat generating section, the silencing equipment comprising:
 a flow channel forming member that forms a flow channel through which the cooling air flows,   wherein an aperture is provided in a portion of the flow channel forming member,   a cavity communicating with the aperture and formed by bending the flow channel forming member is provide,   a slide member sliding by means of a slide mechanism is provided on the top of the aperture to adjust the area of the top of the aperture,   acoustic absorbent members are attached to the flow channel forming member and the slide member, and   the aperture and the cavity form a resonance type silencer on a wall surface of the flow channel by making a cross sectional area of at least one part of the cavity larger than that of an interface between the aperture and the cavity.   
   
   
       6 . Silencing equipment for electronic devices, the silencing equipment being adapted to be installed to an electronic device having a fan that blows cooling air to cool a heat generating section, the silencing equipment comprising:
 a flow channel forming member that forms a flow channel through which the cooling air flows; and   an acoustic absorbent member that is fixed to the flow channel forming member;   wherein the flow channel forming member and the acoustic absorbent member form a cavity, and   the cavity allows flow of the cooling air in the flow channel to spread and thereby forms an expansion type silencer on a wall surface of the flow channel.   
   
   
       7 . Silencing equipment for electronic devices, the silencing equipment being adapted to be installed to an electronic device having a fan that blows cooling air to cool a heat generating section, the silencing equipment comprising:
 a flow channel forming member that forms a flow channel through which the cooling air flows; and   an acoustic absorbent member that is fixed to the flow channel forming member;   wherein a cavity formed by bending the flow channel forming member is provided in the acoustic absorbent member, and   the cavity allows flow of the cooling air in the flow channel to spread and thereby forms an expansion type silencer on a wall surface of the flow channel.