CN107277703B

CN107277703B - Waterproof sound cavity

Info

Publication number: CN107277703B
Application number: CN201710448675.6A
Authority: CN
Inventors: 刘道钱; 黄梦彬
Original assignee: 722th Research Institute of CSIC
Current assignee: 722th Research Institute of CSIC
Priority date: 2017-06-14
Filing date: 2017-06-14
Publication date: 2020-06-09
Anticipated expiration: 2037-06-14
Also published as: CN107277703A

Abstract

The invention discloses a waterproof sound cavity, and belongs to the field of sound equipment. The waterproof sound chamber includes: the waterproof sealing device comprises a panel, a waterproof film, a loudspeaker, a pressing plate and a sealing ring; first recess has been seted up at the middle part of panel, a plurality of apertures have been seted up to the part that the panel was provided with first recess, still set up the annular second recess around first recess on the panel, be provided with the sealing washer in the second recess, waterproof film sets up in the panel in the one side of seting up first recess, and waterproof film covers first recess and sealing washer simultaneously, waterproof film and first recess form first cavity, the sealing washer top is located to the clamp plate pressure, and waterproof film is in between clamp plate and the sealing washer, loudspeaker are fixed on the clamp plate, loudspeaker, form the second cavity between clamp plate and the waterproof film, loudspeaker's output face is towards the second cavity. The waterproof sound cavity can achieve the waterproof grade of IP67, and does not affect sound output.

Description

Waterproof sound cavity

Technical Field

The invention relates to the field of sound equipment, in particular to a waterproof sound cavity.

Background

A broadcasting system is generally deployed on an ocean platform, and a terminal of the broadcasting system includes a sound cavity device responsible for sound output. Due to the harsh marine climate, which is usually a high humidity, high heat, high salt fog environment, the sound cavity equipment needs to be designed and manufactured with consideration of waterproof performance.

At present, the water resistance of the sound cavity equipment is mainly realized by adopting a metal net with high installation gap density, the metal net is installed between a panel and a loudspeaker, the mesh number of the metal net reaches more than 200 meshes, and the sound cavity equipment has a certain water resistance function. Alternatively, a shielding means is used to prevent rain water from entering the sound cavity, for example, a waterproof cover is installed on the outer side of the panel. Although the two waterproof modes have certain waterproof capability, the following defects still exist: the waterproof grade is difficult to reach IP67, and because the sound cavity equipment is in the environment of high humidity, high heat and high salt fog, because of the existence of "breathing effect", steam can get into the inside condensation of sound cavity and cause equipment ponding to damage equipment.

Disclosure of Invention

In order to solve the problem that the existing sound cavity equipment is difficult to achieve the requirement on water resistance, the embodiment of the invention provides a waterproof sound cavity. The technical scheme is as follows:

the embodiment of the invention provides a waterproof sound cavity, which comprises: the waterproof sealing device comprises a panel, a waterproof film, a loudspeaker, a pressing plate and a sealing ring; the utility model discloses a waterproof structure, including panel, sealing washer, loudspeaker, seal ring, waterproof film, loudspeaker, first recess has been seted up at the middle part of panel, a plurality of apertures have been seted up to the part that the panel was provided with first recess, still set up on the panel around the annular second recess of first recess, be provided with in the second recess the seal ring, waterproof film sets up on the one side that first recess was seted up to the panel, just waterproof film covers simultaneously first recess with the seal ring, waterproof film with first recess forms first cavity, the clamp plate is pressed and is located the sealing washer top, just waterproof film is in the clamp plate with between the seal ring, loudspeaker fixes on the clamp plate, loudspeaker the clamp plate with form the second cavity between the waterproof film, the output face orientation of loudspeaker the second cavity.

In one implementation of the embodiment of the invention, the waterproof film is a polytetrafluoroethylene film.

In another implementation manner of the embodiment of the invention, the thickness of the waterproof film is 0.1-0.15 mm.

In another implementation manner of the embodiment of the present invention, the sealing ring is a silicone rubber sealing ring.

In another implementation of the embodiment of the invention, the pressure plate is fixed to the panel by screws.

In another implementation manner of the embodiment of the present invention, the second groove is an O-shaped groove.

In another implementation manner of the embodiment of the invention, the size of the second groove is designed according to the GB/T3452.3-2005 standard.

In another implementation manner of the embodiment of the invention, the shape of the first groove is the same as the shape of the output face of the horn.

In another implementation of the embodiment of the invention, the depth of the first groove is proportional to the diameter of the horn.

In another implementation manner of the embodiment of the present invention, the panel is provided with a plurality of small holes which are uniformly distributed.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

through set up the recess on the panel, then set up waterproof membrane, fix waterproof membrane on the panel through the clamp plate, and be provided with the sealing washer between waterproof membrane and the panel, adopt waterproof membrane and the mode that the sealing washer combines to carry on waterproofly, steam can't pass waterproof membrane and influence loudspeaker, has solved sound external placement equipment waterproof, prevent the condensation problem in the marine environment that the weather is abominable (high fever, high humidity), can reach IP 67's waterproof grade requirement. In addition, waterproof membrane and first recess form the cavity, form the second cavity between loudspeaker, clamp plate and the waterproof membrane, and waterproof membrane both sides are the cavity structure promptly, are favorable to waterproof membrane vibration to spread the sound wave, are equipped with the aperture on the panel for sound transmission is not influenced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a waterproof sound cavity provided in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a waterproof sound cavity provided in an embodiment of the present invention, and referring to fig. 1, the waterproof sound cavity includes a panel 10, a waterproof film 20, a speaker 30, a pressure plate 40, and a sealing ring 50. The middle of the panel 10 is formed with a first groove 60, and the portion of the panel 10 where the first groove 60 is formed with a plurality of small holes 70, where the small holes 70 are through holes, that is, the bottom of the first groove 60 is formed with a plurality of small holes 70. Still set up the annular second recess around first recess 60 on the panel 10, be provided with sealing washer 50 in the second recess, waterproof membrane 20 sets up on the one side that sets up first recess 60 in panel 10, and waterproof membrane 20 covers first recess 60 and sealing washer 50 simultaneously, and waterproof membrane 20 and first recess 60 form first cavity. The pressing plate 40 is arranged above the sealing ring 50 in a pressing mode, the waterproof film 20 is located between the pressing plate 40 and the sealing ring 50, the horn 30 is fixed on the pressing plate 40, and a second cavity is formed among the horn 30, the pressing plate 40 and the waterproof film 20. The output surface of the horn 30 faces the second cavity, and the sound wave output by the horn 30 is transmitted out after passing through the second cavity, the waterproof film 20, the first cavity and the panel with the small holes.

According to the embodiment of the invention, the groove is formed in the panel 10, the waterproof film 20 is arranged, the waterproof film 20 is fixed on the panel 10 through the pressing plate 40, the sealing ring 50 is arranged between the waterproof film 20 and the panel 10, the waterproof film 20 and the sealing ring 50 are combined to prevent water, water vapor cannot penetrate through the waterproof film to influence a loudspeaker, the problems of water prevention and condensation prevention of sound external equipment in a severe (high-temperature and high-humidity) marine environment are solved, and the requirement of IP67 on the waterproof grade can be met. In addition, the waterproof film 20 and the first groove form a cavity, and a second cavity is formed between the loudspeaker 30, the pressing plate 40 and the waterproof film 20, namely, both sides of the waterproof film 20 are both in a cavity structure, so that sound waves can be transmitted out by the vibration of the waterproof film, and the panel 10 is provided with the small holes 70, so that the sound transmission is not influenced.

In the embodiment of the present invention, when the panel 10 and the pressing plate 40 are not assembled together, the sealing ring 50 protrudes from the surface of the panel 10 from the second groove, and when the panel 10 and the pressing plate 40 are assembled together, the sealing ring 50 is compressed in the second groove under the pressure, and at this time, due to the elastic action of the sealing ring 50, a sealing effect is achieved between the panel 10 and the pressing plate 40.

Referring to fig. 1, the first recess 60 and the second recess are disposed on the same face of the panel. The faceplate is the final sound output face of the sound device having the waterproof sound chamber.

In an embodiment of the present invention, the waterproof film 20 may be a teflon film or a polyethylene film. The polytetrafluoroethylene film is preferably used for manufacturing the waterproof film 20, because the polytetrafluoroethylene has excellent chemical resistance and high and low temperature resistance, the waterproof and anti-condensation requirements of sound external equipment in the marine environment can be met.

In the embodiment of the present invention, the thickness of the waterproof film 20 may be 0.1 to 0.15 mm. By adopting the waterproof film 20 with the thickness, the film is softer, the film vibration effect is good, and the sound transmission is convenient; if the thickness of the waterproof film 20 is too thick, the film rigidity is large, which is disadvantageous to vibration and sound transmission, and if the thickness of the waterproof film 20 is too small, the waterproof film 20 is easily broken, so that the optimal performance can be achieved by setting the thickness of the waterproof film 20 within the above thickness range.

In an embodiment of the present invention, the sealing ring 50 may be a silicone rubber sealing ring. The silicon rubber sealing ring has high temperature resistance and is suitable for sealing in marine environment.

In the embodiment of the present invention, the pressing plate 40 may be fixed to the panel 10 by screws. The pressing plate 40 is fixed by screws, so that the air tightness of the waterproof sound cavity can be ensured, and water is effectively prevented from leaking to the inner horn 30 from the small hole 70.

Further, the pressure plate 40 has a rigidity high enough to be deformed by the elastic force of the seal ring 50 to cause leakage. For example, the pressing plate 40 is made of an aluminum plate, specifically, an anti-rust aluminum plate can be used, and the pressing plate 40 made of the anti-rust aluminum plate has good anti-corrosion performance and better economical efficiency and practicability. Of course, the present invention is not limited in this regard and the platen may be made of other materials.

In an embodiment of the present invention, the second groove may be an O-shaped groove. The O-shaped groove is convenient to design and can meet the sealing requirement.

Further, the size of the O-shaped groove is designed according to the GB/T3452.3-2005 standard.

In the embodiment of the present invention, the shape of the first groove 60 is the same as the shape of the output surface of the horn, for example, when the output surface of the horn is circular, the shape of the first groove 60 may be circular, and when the output surface of the horn is rectangular, the shape of the first groove 60 may be rectangular. Since the shape of the first groove 60 is the same as the shape of the output face of the horn, the sound output by the horn can be better propagated. The output surface of the horn refers to a surface of the horn outputting sound, and the output surface of the horn is usually a diaphragm of the horn.

In the embodiment of the present invention, the depth of the first groove 60 is proportional to the diameter of the horn, i.e., the larger the diameter of the horn, the greater the depth of the first groove 60. For example, the diameter of the horn is 30mm, the depth of the first groove may be designed to be 3mm, the diameter of the horn is 60mm, and the depth of the first groove may be designed to be 6 mm.

In the present embodiment, a plurality of small holes 70 are uniformly distributed on the panel 10. By providing a sufficient number of small holes, normal sound transmission is achieved. Each of the small holes may have a diameter of 1.5mm, and the total area of the plurality of small holes is 10-15% of the area of the first groove.

The airtight test was performed after the assembly of the waterproof sound chamber shown in fig. 1 was completed. There is enough space on both sides of the waterproof membrane 20 to ensure that the vibration of the waterproof membrane 20 is not disturbed, and the sound output of the speaker 30 is not affected.

Here, the depth of the cavity on one side (right side in fig. 1) of the waterproof film 20 corresponds to the depth of the first groove 60, and therefore, the depth of the first groove 60 can be referred to in the foregoing. The depth of the cavity on the other side (left side in fig. 1) of the waterproof membrane 20 corresponds to the thickness of the pressing plate 40. The thickness of the platen 40 is proportional to the diameter of the horn, with the greater the diameter of the horn, the greater the thickness of the platen 40. For example, the diameter of the horn is 30mm, the thickness of the pressing plate 40 may be designed to be 5mm, the diameter of the horn is 60mm, and the thickness of the pressing plate 40 may be designed to be 10 mm.

The cavity of waterproof membrane 20 both sides is the preceding sound chamber of loudspeaker, because waterproof membrane 20's existence, this preceding sound chamber is divided into left and right sides sound chamber again, and left side sound chamber is great, is favorable to making the sound of low frequency more have the dynamics, lets the people feel sound mellow.

Referring to fig. 1, the panel 10 further includes an extension a disposed around the pressing plate 40 and perpendicular to the body of the panel 10, the extension a forming a horn back sound cavity with a rear case (not shown) of the horn 30. Reference numeral B in fig. 1 is an interface of the panel 10, and the panel 10 is connected to the rear shell of the speaker 30 at the plane, and the connection manner includes, but is not limited to, a bolt connection. Further, a rubber ring is arranged between the panel 10 and the rear shell for sealing, so that the sealing performance of the rear sound cavity of the loudspeaker is guaranteed.

In addition, can be through bolted connection equally between loudspeaker 30 and the clamp plate 40, adopt silica gel sealed around loudspeaker 30 and the clamp plate 40 contact surface to sound chamber can keep apart with loudspeaker back sound chamber before making loudspeaker, because sound chamber before the loudspeaker is opposite with back sound chamber phase place, if take place to reveal and can make loudspeaker sound diminish.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A waterproof sound chamber, characterized in that the waterproof sound chamber comprises: the waterproof sealing device comprises a panel, a waterproof film, a loudspeaker, a pressing plate and a sealing ring;

the middle part of the panel is provided with a first groove, the part of the panel provided with the first groove is provided with a plurality of small holes, the panel is also provided with an annular second groove surrounding the first groove, a sealing ring is arranged in the second groove, the waterproof film is arranged on the surface of the panel provided with the first groove, the waterproof film covers the first groove and the sealing ring simultaneously, the waterproof film and the first groove form a first cavity, the pressing plate is pressed above the sealing ring, the waterproof film is positioned between the pressing plate and the sealing ring, the horn is fixed on the pressing plate, a second cavity is formed among the horn, the pressing plate and the waterproof film, and the output surface of the horn faces the second cavity;

the depth of the first groove is in direct proportion to the diameter of the horn, and the thickness of the pressing plate is in direct proportion to the diameter of the horn;

the waterproof film is a polytetrafluoroethylene film, and the thickness range of the waterproof film is 0.1-0.15 mm;

the panel is provided with a plurality of small holes which are uniformly distributed, and the total area of the small holes is 10% -15% of the area of the first groove.

2. The chamber of claim 1 wherein the seal is a silicone rubber seal.

3. The waterproof sound chamber as claimed in claim 1 or 2, wherein the pressure plate is fixed to the face plate by screws.

4. The waterproof sound chamber according to claim 1 or 2, wherein the second groove is an O-shaped groove.

5. The waterproof sound cavity of claim 4, wherein the second groove is dimensioned according to the GB/T3452.3-2005 standard.

6. The waterproof sound chamber according to claim 1 or 2, wherein the shape of the first groove is the same as the shape of the output face of the horn.