CN109600702B

CN109600702B - Sound alarm device

Info

Publication number: CN109600702B
Application number: CN201710923365.5A
Authority: CN
Inventors: 林绍忱; 罗京宜; 韩国梁
Original assignee: Siemens Schweiz AG
Current assignee: Siemens Schweiz AG
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2021-12-03
Anticipated expiration: 2037-09-30
Also published as: CN109600702A

Abstract

An acoustic warning device comprises an acoustic source element (20), at least one acoustic chamber (52) and at least two guide ribs (60). The sound source element is arranged at the center part of the sound alarm device; the sound cavity is provided with a throat (51) and a sound amplifying port (56), wherein the throat of the sound cavity is arranged near the sound source element, the sound amplifying port is arranged at the edge of the sound alarm device, and the sound cavity extends to the sound amplifying port from the throat along the radial direction (R) of the sound alarm device with the sound source element as the center of a circle; guide ribs (60) are arranged in the acoustic chamber at a distance in the radial direction, extend in a direction perpendicular to the radial direction and are designed for reinforcing acoustic signals in a specific frequency range, in particular for reinforcing acoustic signals with frequencies in the vicinity of 520 Hz.

Description

Sound alarm device

Technical Field

The invention relates to an alarm device in the field of fire fighting, in particular to an acoustic alarm device in the field of fire fighting.

Background

The piezoelectric ceramic piece is an electronic sound component, a piezoelectric ceramic dielectric material is placed between two copper round electrodes, and when an alternating-current audio signal is connected to the two electrodes, the piezoelectric piece can vibrate according to the magnitude frequency of the signal to generate corresponding sound. The fire alarm has the characteristics of high sensitivity, low energy consumption and the like, and is widely applied to the sound alarm device, in particular to the sound alarm device in the fire fighting field. At present, the sound alarm device using the piezoelectric ceramic plate as the sounding element is limited by the sounding element, and a sound cavity is generally required to be equipped to strengthen the sound, so as to meet the requirements of European standard EN54-3 on sound pressure level and directivity.

In the field of fire fighting, it is also common to integrate smoke detectors and acoustic/optical alarms in the same device for compactness. In such an integrated alarm device, the acoustic chamber design would have to be placed closer to the back plate. This increases the difficulty of the acoustic chamber design.

Disclosure of Invention

The object of the present invention is to provide an acoustic alarm device whose acoustic chamber structure is able to meet the requirements of sound pressure level and directivity of, for example, european certification standard EN54-3, while facilitating the use of the internal space of the acoustic alarm device.

It is a further object of the invention to provide an acoustic warning device having a sound chamber structure that is able to meet the requirements of sound pressure level and directivity, for example of european certification standard EN54-3, and in particular to be able to accommodate sound pressure level requirements for frequencies of 520 Hz.

The invention provides an acoustic alarm device comprising an acoustic source element, at least one acoustic chamber and at least two guide ribs. The sound source element is arranged at the center part of the sound alarm device; the sound cavity is provided with a throat opening and a sound amplifying opening, wherein the throat opening of the sound cavity is arranged near the sound source element, the sound amplifying opening is formed in the edge of the sound alarm device, and the sound cavity extends from the throat opening to the sound amplifying opening in the radial direction of the sound alarm device with the sound source element as the center of a circle; the guide ribs are arranged in the acoustic chamber at a distance from each other in the radial direction, extend in a direction perpendicular to the radial direction and are designed for reinforcing acoustic signals in a specific frequency range, in particular for reinforcing acoustic signals having a frequency in the vicinity of 520 Hz.

The sound alarm device provided by the invention has the advantages that the sound source element is arranged in the center of the sound alarm device, and the sound cavity is provided with the throat opening arranged near the sound source element and the sound amplifying opening arranged at the edge of the sound alarm device. Guide ribs are arranged at radially spaced intervals in the acoustic chamber for reinforcing acoustic signals in a specific frequency range, in particular for reinforcing acoustic signals having a frequency in the vicinity of 520 Hz.

In a further exemplary embodiment of the acoustic warning device, the guide rib connects three adjacent side walls of the acoustic chamber in which it is located, or connects opposite side walls of the acoustic chamber in which it is located. Preferably, the guide ribs are staggered within the acoustic cavity.

In another exemplary embodiment of the acoustic warning device, the acoustic warning device includes at least three guide ribs arranged along a direction in which the acoustic chamber extends, the at least three guide ribs being alternately connected to one of a pair of side walls of the acoustic chamber.

In another exemplary embodiment of the acoustic warning device, at least three guide ribs are included, which increase gradually in the extension direction of the acoustic chamber with respect to the spacing.

In another exemplary embodiment of the sound alarm device, the sound alarm device comprises a first plate body and a second plate body, wherein the first plate body and the second plate body can be mutually buckled to form four sound cavities which are uniformly spaced, and a spacing area between the sound cavities is provided with a wiring port and/or a through hole, the four sound cavities can effectively improve the directivity of sound, and the spacing area is favorable for space utilization.

In another exemplary embodiment of the acoustic warning device, the acoustic chamber is in the shape of a horn in a plane perpendicular to the axial direction of the acoustic warning device, or the acoustic chamber is in the shape of a horn in a plane parallel to the axial direction of the acoustic warning device. It is advantageous to enhance the sound signal.

In another exemplary embodiment of the acoustic alarm device, the acoustic alarm device further comprises a base, the first plate can cover the base and form a front cavity, and a sound transmission hole which can be communicated with the front cavity is formed in the first plate; the second plate body is arranged on one side of the first plate body, which is opposite to the base, and is parallel to the first plate body; the sound source element is a piezoelectric ceramic sound generating element which is arranged in the front cavity.

In another exemplary embodiment of the sound alarm device, the first plate and the second plate are circular plates with the same shape and are concentrically arranged with the sound transmission hole, so that the sound cavity is conveniently and uniformly arranged, and the sound directionality can be effectively improved.

In another exemplary embodiment of the sound alarm device, the side walls of the sound cavity are arc-shaped plate bodies perpendicular to the first plate body and are respectively recessed towards the interior of the sound cavity, which is beneficial to enhancing sound signals.

In another exemplary embodiment of the acoustic warning device, the sound source element is a piezoelectric ceramic sound generating element, and includes: the piezoelectric vibrating diaphragm comprises a metal vibrating diaphragm and two piezoelectric ceramic pieces, wherein the two piezoelectric ceramic pieces are oppositely arranged on two sides of the metal vibrating diaphragm respectively.

The above features, technical features, advantages and modes of realisation of the acoustic warning device will be further described in the following, in a clearly understandable manner, with reference to the accompanying drawings, which illustrate preferred embodiments.

Drawings

The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.

Fig. 1 is a schematic cross-sectional structure for explaining an exemplary embodiment of an acoustic alarm device.

Fig. 2 is an exploded structure diagram for explaining an exemplary embodiment of an acoustic alarm device.

Fig. 3 is a schematic configuration diagram for explaining another exemplary embodiment of the acoustic alarm device.

Fig. 4 is a partial sectional structural view for explaining the acoustic alarm device shown in fig. 3.

Fig. 5 is a schematic configuration diagram for explaining another exemplary embodiment of the acoustic alarm device.

Description of the reference symbols

10 base

12 front cavity

20 piezoelectric ceramic sound generating element

22 metal vibrating sheet

24 piezoelectric ceramic plate

30 first plate body

32 sound transmission hole

40 second plate body

51 roar

52 Sound cavity

54 accommodation area

56 public address mouth

58 wiring port

59 through hole

60 guide rib

R radial direction

Detailed Description

In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

Fig. 1 is an exploded view for explaining an exemplary embodiment of an acoustic alarm device. Fig. 2 is a schematic cross-sectional structure for explaining an exemplary embodiment of an acoustic alarm device. Referring to fig. 1, the acoustic warning device includes an acoustic source element 20, at least one acoustic chamber 52, and at least two guide ribs 60. The sound source element 20 is placed in the center of the acoustic warning device. The acoustic chamber 52 has a throat 51 and a mouthpiece 56, wherein the throat 51 of the acoustic chamber 52 is located adjacent the acoustic source element 20, the mouthpiece 56 opens at the edge of the acoustic warning device, and the acoustic chamber 52 extends from the throat 51 to the mouthpiece 56 in a radial direction R of the acoustic warning device centred on the acoustic source element 20. The guide ribs 60 are arranged in the acoustic chamber 52 at intervals in the radial direction R, the guide ribs 60 extending in a direction perpendicular to the radial direction R.

In the acoustic alarm device of the present invention, a sound source element 20 is disposed at the center of the acoustic alarm device, and an acoustic chamber 52 has a throat 51 disposed near the sound source element 20 and a mouthpiece 56 opened at the edge of the acoustic alarm device. The guide ribs 60 are arranged spaced apart in the radial direction R in the acoustic chamber 52, the guide ribs 60 serving to reinforce acoustic signals in a specific frequency range, in particular at frequencies in the vicinity of 520 Hz.

In an exemplary embodiment, referring to fig. 1 and 2, the audible alarm device includes a first board 30, a second board 40, and a base 10. The first plate 30 can be placed over the base 10 to form a front cavity 12. The first plate 30 is formed with a sound transmitting hole 32 capable of communicating with the front chamber 12. The sound source element 20 is a piezoceramic sound generating element 20, which is arranged in the front cavity 12. The second board body 40 is disposed on a side of the first board body 30 opposite to the base 10 and parallel to the first board body 30, and the first board body 30 and the second board body 40 can be fastened to each other, so as to form the acoustic cavity 52. The first plate 30 and the second plate 40 are circular plates having the same shape and are concentrically disposed with the sound transmitting holes 32, so that the sound source element 20 is disposed at the center of the sound alarm device. The throat 51 of the acoustic cavity 52 is communicated with the sound transmission hole 32, the acoustic cavity 52 extends from the throat 51 to the edge of the first plate 30 and the second plate 40 along the radial direction R, and the sound amplifying port 56 is opened along the direction parallel to the first plate 30 or the second plate 40.

In the illustrated embodiment, the acoustic chamber 52 is formed by the first plate 30 and the second plate 40 being fastened to each other and surrounded by four sidewalls, i.e., upper, lower, left, and right sidewalls. In the example of fig. 3 and 5, three guide ribs 60 are included in each acoustic chamber 52, but the present invention is not limited thereto, and in other exemplary embodiments, the guide ribs 60 may be designed in other numbers larger than three according to actual needs. Preferably, the guide rib 60 connects three adjacent side walls of the acoustic chamber 52 where it is located.

In the example of fig. 3 and 4, three side walls (left, right, and lower) of the acoustic chamber 52 are formed on the first plate body 30, and an upper side wall of the acoustic chamber 52 is formed on the second plate body 40. At this time, the guide rib 60 connects both the left and right side walls of the acoustic chamber 52 and the lower side wall (on the first plate body 30). Fig. 4 shows a cross-sectional view of an acoustic chamber with such guide ribs. In the acoustic chamber shown in fig. 4, the sound transmitted from the sound transmitting hole 32 travels along the path shown by the dotted arrow in fig. 4, thereby enhancing the resonance effect of the sound within the acoustic chamber 52 while increasing the distance the sound travels within the acoustic chamber 52. This sound enhancement is particularly effective for sound signals in a particular frequency range, and is particularly advantageous for enhancing sound signals having frequencies around 520 Hz.

In other exemplary embodiments, the guide ribs 60 may also be staggered. Specifically, for example, the guide rib 60 may connect the upper and lower sidewalls at the same time and alternately connect the left and right sidewalls, respectively, as shown in fig. 5. Alternatively still, the guide rib 60 may also be attached to one of the opposing side walls of the acoustic chamber 52 in which it is located, i.e. the guide rib is suspended within the acoustic chamber. For example, as a modification of the example of fig. 4, the guide ribs 60 may be alternately connected to the upper or lower side walls so as to form a staggered (staggered) arrangement in the vertical direction. Alternatively, as a modification of the example shown in fig. 5, the guide rib 60 may be alternately connected only to the left side wall or the right side wall. The staggered guide ribs can enable sound signals to propagate in the sound cavity 52 as indicated by the dashed arrows in fig. 5, enhance the resonance effect of sound in the sound cavity 52, increase the distance of sound propagation in the sound cavity 52, and enhance sound signals in a specific frequency range, especially for sound signals with frequencies around 520 Hz.

In the exemplary embodiment, referring to fig. 3, the spacing between adjacent guide ribs 60 increases gradually in the direction of extension along the acoustic chamber 52. This is advantageous for enhancing the sound signal of a specific frequency band, and is particularly effective for a 520hz sound signal specified in the standard.

In the exemplary embodiment, and with reference to fig. 3, the acoustic chamber 52 is in the shape of a horn in a plane perpendicular to the axial direction of the acoustic alarm, i.e. the width gradually increases in the direction of the radial direction R. However, without being limited thereto, in other exemplary embodiments, the acoustic chamber 52 is in a horn shape in a plane parallel to the axial direction of the acoustic alarm, i.e., the height gradually increases in the direction along the radial direction R, and the side walls of the acoustic chamber 52 are arc-shaped plates perpendicular to the first plate 30 and are respectively recessed toward the inside of the acoustic chamber of the guide rib. The horn-shaped acoustic chamber 52 is advantageous for enhancing the acoustic signal, and in other exemplary embodiments, the shape of the acoustic chamber 52 is not limited thereto, but may be other shapes that are advantageous for enhancing the acoustic signal.

In an exemplary embodiment, referring to fig. 3, four sound cavities 52 are formed between the first plate 30 and the second plate 40, and two adjacent sound cavities 52 are perpendicular to each other to effectively improve the sound directivity. And the spacing between the four acoustic chambers 52 forms a receiving area 54 which may provide mounting space for the passage of other components or mounting bolts for securing the acoustic warning device. Meanwhile, the spacing area between the sound cavities 52 is provided with a wiring port 58 for connecting other elements and a through hole 59 for passing a bolt, and the structure makes full use of the inner space of the sound alarm device, thereby contributing to the miniaturization of the sound alarm device. In the illustrated embodiment, the acoustic alarm device includes four acoustic chambers 52, but is not limited thereto, and in other suitable embodiments, the number of acoustic chambers 52 may be designed according to actual situations, and it is also possible to include only one acoustic chamber 52.

In the exemplary embodiment, the sound source element 20 is a piezoelectric ceramic sound generating element including one metal vibrating piece 22 and two piezoelectric ceramic pieces 24 (only one is shown in the drawing). The two piezoelectric ceramic pieces 24 are oppositely arranged on two sides of the metal vibrating piece 22 respectively.

The following table shows the relationship between sound pressure level and frequency at different powers with and without the guide ribs 60. It is clear from the table below that the guide ribs 60 have a significant effect on sound reinforcement at around 500 Hz.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description of a series of embodiments is merely a specific description of possible examples of the present invention, and is not intended to limit the scope of the invention, and equivalent embodiments or modifications, such as combinations, divisions or repetitions of features, which do not depart from the technical spirit of the present invention, should be included in the scope of the present invention.

Claims

1. Audible alarm device, its characterized in that includes:

a sound source element (20) disposed at a center portion of the acoustic alarm device;

-at least one acoustic chamber (52), each acoustic chamber (52) having a throat (51) and a loud-speaking port (56), wherein the throat (51) of the acoustic chamber (52) is located adjacent to the acoustic source element (20), the loud-speaking port (56) opens at an edge of the acoustic warning device, and the acoustic chamber (52) extends from the throat (51) to the loud-speaking port (56) in a radial direction (R) centered around the acoustic source element (20);

at least three guide ribs (60) arranged in the acoustic chamber (52) at intervals in the radial direction (R), the interval between adjacent two guide ribs (60) gradually increasing along the extension direction of the acoustic chamber (52); the guide ribs (60) extend in a direction perpendicular to the radial direction (R) and are designed to reinforce acoustic signals in a specific frequency range, wherein the specific frequency range is a frequency range suitable for acoustic warning devices in the fire fighting field;

wherein the acoustic chamber (52) is horn-shaped in a plane perpendicular to the axial direction of the acoustic alarm and gradually increases in width in the radial direction (R).

2. An acoustic warning device according to claim 1, characterised in that the guide rib (60) connects three adjacent side walls of the acoustic chamber (52) in which it is located, or connects opposite side walls of the acoustic chamber (52) in which it is located.

3. An acoustic warning device according to claim 1, characterised in that the guide ribs (60) are staggered within the acoustic chamber (52).

4. An acoustic warning device according to claim 3, characterised in that it comprises at least three of said guide ribs (60) aligned along the direction in which said acoustic chamber (52) extends, said at least three guide ribs being connected alternately to one of a pair of side walls of said acoustic chamber (52).

5. An acoustic warning device according to claim 1, wherein the guide ribs are adapted to reinforce acoustic signals having a frequency in the vicinity of 520 Hz.

6. The audible alarm device according to claim 1, comprising: the sound-absorbing board comprises a first board body (30) and a second board body (40), wherein the first board body (30) and the second board body (40) are buckled with each other to form four sound cavities (52) which are evenly spaced, and a wiring port (58) and/or a through hole (59) are/is arranged in a spacing area between the sound cavities (52).

7. An acoustic alarm device according to claim 1, characterised in that the acoustic chamber (52) is horn shaped in a plane parallel to the axial direction of the acoustic alarm.

8. An audible alarm device as claimed in claim 6, further comprising a base (10), wherein

The first plate body (30) can be covered on the base (10) and form a front cavity (12), and a sound transmission hole (32) which can be communicated with the front cavity (12) is formed in the first plate body (30);

the second plate body (40) is arranged on one side, back to the base (10), of the first plate body (30) and is parallel to the first plate body (30);

the sound source element (20) is a piezoelectric ceramic sound generating element (20) which is arranged in the front cavity (12).

9. The acoustic alarm device according to claim 8, wherein the first plate (30) and the second plate (40) are circular plates having the same shape and are concentrically arranged with the sound transmission hole (32).

10. An acoustic warning device according to claim 8, characterised in that the side walls of the acoustic chamber (52) are arc-shaped plates perpendicular to the first plate (30) and are each recessed towards the inside of the acoustic chamber (52).

11. An acoustic alarm device according to claim 1, characterised in that the acoustic source element (20) is a piezoceramic sound generating element and comprises: the vibrating diaphragm comprises a metal vibrating diaphragm (22) and two piezoelectric ceramic plates (24), wherein the two piezoelectric ceramic plates (24) are respectively and oppositely arranged on two sides of the metal vibrating diaphragm (22).