CN216057481U

CN216057481U - Loudspeaker and broadcasting system

Info

Publication number: CN216057481U
Application number: CN202121796135.5U
Authority: CN
Inventors: 不公告发明人
Original assignee: Yingzhi Technology Changzhou Co ltd
Current assignee: Yingzhi Technology Changzhou Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-03-15
Anticipated expiration: 2031-08-03

Abstract

The utility model relates to the technical field of fire fighting broadcasting, in particular to a loudspeaker and a broadcasting system, wherein the loudspeaker comprises a plurality of piezoelectric type horns, the rated voltages of the piezoelectric type horns are the same, the sum of the rated voltages of the piezoelectric type horns is equal to the output voltage of a constant voltage power amplifier, the piezoelectric type horns are sequentially connected in series to form a series circuit, and two ends of the series circuit are connected with two output ends of the constant voltage power amplifier. According to the loudspeaker provided by the utility model, the plurality of piezoelectric type loudspeakers are connected in parallel to replace a constant-voltage loudspeaker in the prior art, so that an inter-line transformer is omitted, and the cost is greatly saved.

Description

Loudspeaker and broadcasting system

Technical Field

The utility model relates to the technical field of fire-fighting broadcasting, in particular to a loudspeaker and a broadcasting system.

Background

The loudspeaker is a transducer for converting an electric signal into an acoustic signal, and is classified into an electrodynamic type, an electrostatic type, an electromagnetic type, a piezoelectric type and the like according to the transduction principle, and a low-frequency loudspeaker, a medium-frequency loudspeaker and a high-frequency loudspeaker according to the frequency range.

The loudspeaker is generally driven by a power amplifier, and the power amplifier amplifies a weak electric signal from a signal source to drive the loudspeaker to make a sound. The power amplifier is divided into a constant resistance power amplifier and a constant voltage power amplifier, the output voltage of the constant resistance power amplifier changes along with the change of load, the impedance of the load is required to be constant, generally 4 ohms or 8 ohms, the output voltage of the constant voltage power amplifier does not change along with the change of the load impedance, the maximum voltage of the output audio signal is constant, and due to the adoption of deep negative feedback, the output voltage is very stable, and the influence of the number of loads connected within a rated power range on the output voltage of the amplifier is small.

In a broadcasting system, because the distance between a loudspeaker and a power amplifier is long, and the line loss generated by adopting low-voltage transmission is high, high-voltage transmission is generally adopted, namely, constant-voltage power amplification is adopted, the loudspeaker is also generally a high-voltage constant-voltage loudspeaker, such as 70V, 100V, 120V and the like, but a line-to-line transformer for voltage reduction is generally integrated in the shell of the constant-voltage loudspeaker, the price is high, and the maintenance and replacement cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a loudspeaker, aiming at solving the technical problem of high cost caused by integration of a line transformer into a constant-voltage loudspeaker driven by a constant-voltage power amplifier in the prior art, and the loudspeaker does not need to adopt a line transformer, thereby greatly saving the cost.

The technical scheme of the utility model is as follows:

a loudspeaker, comprising:

the piezoelectric type loudspeaker's rated voltage is the same to a plurality of piezoelectric type loudspeaker's rated voltage sum equals the output voltage of level voltage power amplifier, a plurality of form series circuit after piezoelectric type loudspeaker establishes ties in proper order, two output of level voltage power amplifier are connected at series circuit's both ends.

Furthermore, a plurality of piezoelectric type loudspeaker are evenly arranged or are arranged in a matrix form along the circumferential direction.

Furthermore, the loudspeaker also comprises a diaphragm, wherein the diaphragm is provided with a plurality of piezoelectric loudspeakers, and the piezoelectric loudspeakers are uniformly distributed along the circumferential direction.

Further, the loudspeaker also comprises an upper cover and a lower shell, wherein a step is arranged on the inner wall of the lower shell, and the vibrating diaphragm is arranged on the step.

Furthermore, a plurality of sound holes are formed in the upper cover, and a plurality of mounting holes are formed in the upper cover.

Furthermore, a wire outlet hole is formed in the lower shell, and two ends of a series circuit formed by the piezoelectric type horns penetrate through the wire outlet hole through a lead and then are connected with the constant-voltage power amplifier.

Furthermore, the rated voltage of each piezoelectric type horn is 20V, the output voltage of the constant voltage power amplifier is 120V, and the number of the piezoelectric type horns is 6.

Further, a plurality of piezoelectric type loudspeaker establish ties in proper order and form a loudspeaker subassembly, the speaker includes a plurality of loudspeaker subassembly, every loudspeaker subassembly's both ends are all connected two output of level pressure power amplifier.

In another aspect of the utility model there is provided a broadcast system comprising a loudspeaker as claimed in any one of the preceding claims.

Furthermore, broadcasting system includes a plurality of the speaker, broadcasting system still includes sound source and level voltage power amplifier, every the speaker all connects in the level voltage power amplifier, the level voltage power amplifier will the signal amplification of sound source is exported for a plurality of the speaker.

After the technical scheme is adopted, compared with the prior art, the utility model has the following beneficial effects: according to the utility model, the constant-voltage horn is replaced by connecting the piezoelectric horns in series, and the sum of rated voltages of the piezoelectric horns is equal to the output voltage of the constant-voltage power amplifier, so that a line-to-line transformer in the constant-voltage horn can be omitted, and the cost is saved; and because piezoelectric type loudspeaker itself does not use structures such as coil, magnet, its structure is simpler, and volume and weight are littleer, and the cost is very low for this speaker's overall structure is simple, further practices thrift the cost.

Drawings

Fig. 1 is a schematic layout diagram of a piezoelectric horn according to a first embodiment;

fig. 2 is a schematic layout view of a piezoelectric horn according to another embodiment of the first embodiment;

fig. 3 is a schematic structural diagram of a speaker according to a first embodiment of the present invention at a first viewing angle;

fig. 4 is a schematic structural diagram of a speaker in a second viewing angle according to the first embodiment;

fig. 5 is an exploded view of the speaker according to the first embodiment from a third perspective;

fig. 6 is an exploded view of the speaker according to the first embodiment from a fourth perspective;

fig. 7 is a diagram of a broadcasting system according to a second embodiment.

Wherein the content of the first and second substances,

the piezoelectric loudspeaker comprises a loudspeaker 1, a piezoelectric type loudspeaker 11, a vibrating diaphragm 12, an upper cover 13, a sound hole 131, a mounting hole 132, a lower shell 14, a step 141 and a wire outlet 142; a constant voltage power amplifier 2; a sound source 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The first embodiment is as follows:

as shown in fig. 1, this embodiment provides a loudspeaker 1, where the loudspeaker 1 includes a plurality of piezoelectric horns 11, the rated voltages of the piezoelectric horns 11 are the same, and the sum of the rated voltages of the piezoelectric horns 11 is equal to the output voltage of the constant voltage power amplifier, that is, the number of the piezoelectric horns 11 is determined according to the rated voltage and the output voltage of the constant voltage power amplifier, and if the rated voltage of the piezoelectric horn 11 is 20V and the output voltage of the constant voltage power amplifier is 120V, the number of the piezoelectric horns 11 is 6; if the rated voltage of the piezoelectric type horns 11 is 10V and the output voltage of the constant voltage power amplifier is 120V, selecting 12 piezoelectric type horns 11; the quantity of piezoelectric type loudspeaker 11 is 6 in this embodiment, and these 6 piezoelectric type loudspeaker 11 evenly arrange along the circumferencial direction, so can make the sound production more even.

The piezoelectric type loudspeaker mainly comprises a piezoelectric film and a metal sheet, wherein the piezoelectric film can convert electric energy into mechanical energy and generate bending vibration after power is received so as to push surrounding air to produce sound.

Further, in this embodiment, a plurality of piezoelectric type loudspeaker 11 forms series circuit after establishing ties in proper order, two output terminals of level voltage power amplifier are connected at series circuit's both ends, specifically, as shown in fig. 1, the first output terminal of level voltage power amplifier is connected to the piezoelectric film of first piezoelectric type loudspeaker 11, the piezoelectric film of second piezoelectric type loudspeaker 11 is connected to the foil of first piezoelectric type loudspeaker 11, the piezoelectric film of third piezoelectric type loudspeaker 11 is connected to the foil of second piezoelectric type loudspeaker 11, so on, the second output terminal of level voltage power amplifier is connected to the foil of last piezoelectric type loudspeaker 11, so make a plurality of piezoelectric type loudspeaker 11 form series circuit.

Like this, this embodiment replaces the constant voltage loudspeaker through connecting a plurality of piezoelectric type loudspeaker 11 in series to the rated voltage sum of a plurality of piezoelectric type loudspeaker 11 equals the output voltage of constant voltage power amplifier, so can save the line-to-line transformer in the constant voltage loudspeaker, practices thrift the cost. Moreover, the piezoelectric type horn 11 does not use a coil, a magnet or other structures, so that the structure is simpler, the volume and the weight are smaller, the cost is very low, the overall structure of the loudspeaker 1 is simple, and the cost is further saved.

As shown in fig. 2, as another embodiment of the present embodiment, the piezoelectric speakers 11 may also be arranged in a matrix manner, that is, three piezoelectric speakers are arranged in the first row and three piezoelectric speakers are arranged in the second row, or two piezoelectric speakers are arranged in the first row, two piezoelectric speakers are arranged in the second row, and two piezoelectric speakers are arranged in the third row.

As shown in fig. 3 to 6, the loudspeaker 1 of the present embodiment further includes a diaphragm 12, and the piezoelectric speakers 11 are fixed on the diaphragm 12, specifically, fixed by bonding or the like. Further, the speaker 1 further includes an upper cover 13 and a lower case 14, a step 141 is provided on an inner wall of the lower case 14, and a size of the step 141 is matched with a size of the diaphragm 12, so that the diaphragm 12 is bonded to the step 141. The utility model is not limited to a certain specific type of piezoelectric type horn, and some improved piezoelectric type horns exist in the prior art, which have good sounding effect, so in other embodiments, the improved piezoelectric type horns can be adopted to improve the sounding effect.

Further, the present embodiment is provided with a plurality of sound holes 131 on the upper cover 13, and a plurality of mounting holes 132 are further provided on the upper cover 13 to facilitate fixing the speaker 1. Furthermore, a wire outlet 142 is provided on the lower shell 14, and two ends of a series circuit formed by the plurality of piezoelectric speakers 11 are connected with the constant voltage power amplifier after passing through the wire outlet 142 through a lead.

In this embodiment, only one set of piezoelectric speakers 11 is adopted, and in other embodiments, a mode in which multiple sets of piezoelectric speakers 11 are connected in parallel may also be adopted, specifically, in this embodiment, a plurality of piezoelectric speakers 11 are sequentially connected in series to form one speaker assembly, in other embodiments, the speaker 1 may include a plurality of speaker assemblies, and the plurality of speaker assemblies are connected in parallel, that is, two output ends of the constant voltage power amplifier are connected to two ends of each speaker assembly. In this way, a loudspeaker assembly is added to each loudspeaker 1 to increase the loudness, and preferably, a plurality of loudspeaker assemblies can be distributed on both sides of the diaphragm 12 to make full use of space.

As can be seen from the above, in the speaker provided in this embodiment, the plurality of piezoelectric speakers are connected in parallel to replace the constant-voltage speaker in the prior art, so that the line-to-line transformer is omitted, and the cost is greatly saved.

Example two:

as shown in fig. 7, the present embodiment provides a broadcasting system, which includes a plurality of speakers 1 according to the first embodiment, the plurality of speakers 1 are respectively disposed in a target area, for example, in different fire partitions of fire protection regulations, the broadcasting system of the present embodiment further includes a sound source 3 and a constant voltage power amplifier 2, the sound source 3 may be a microphone or a recorded audio, the plurality of speakers 1 are connected in parallel with each other and are all connected to the constant voltage power amplifier 2, and the constant voltage power amplifier 2 amplifies and outputs a signal of the sound source 3 to each of the speakers 1.

The broadcasting system of the embodiment also comprises a fire-fighting broadcasting host and a fire alarm controller, wherein the fire-fighting broadcasting host is internally provided with a constant-voltage power amplifier 2, is connected with a sound source 3 and is connected with each loudspeaker 1 through a fire-fighting broadcasting line. Still be equipped with broadcast output module between fire control broadcasting host computer and each speaker 1, broadcast output module is including the normally open contact of relay, after receiving alarm signal, on the one hand with fire control broadcasting host computer communication when fire alarm controller, make it through fire control broadcasting line drive speaker 1 broadcast audio frequency, on the other hand fire alarm controller still through two bus connection in the broadcast output module of fire control, speaker 1 in the fire prevention subregion that needs to be used for reporting is confirmed according to fire alarm's address, the normally open contact on the closed these speaker 1 place broadcasting loop that need report makes these speaker 1 communicate in level pressure power amplifier 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A loudspeaker, comprising:

a plurality of piezoelectric type loudspeaker (11), a plurality of the rated voltage of piezoelectric type loudspeaker (11) is the same, and a plurality of the rated voltage sum of piezoelectric type loudspeaker (11) equals the output voltage of level voltage power amplifier, a plurality of form series circuit after piezoelectric type loudspeaker (11) establish ties in proper order, the both ends of series circuit are connected two output ends of level voltage power amplifier.

2. The loudspeaker according to claim 1, wherein a plurality of the piezoelectric horns (11) are arranged uniformly or in a matrix form in a circumferential direction.

3. The loudspeaker according to claim 1, further comprising a diaphragm (12), wherein a plurality of piezoelectric speakers (11) are disposed on the diaphragm (12), and the plurality of piezoelectric speakers (11) are uniformly arranged along a circumferential direction.

4. A loudspeaker according to claim 3, further comprising an upper cover (13) and a lower shell (14), wherein the inner wall of the lower shell (14) is provided with a step (141), and the diaphragm (12) is disposed on the step (141).

5. A loudspeaker according to claim 4, wherein a plurality of sound holes (131) are provided in the upper cover (13), and a plurality of mounting holes (132) are provided in the upper cover (13).

6. The loudspeaker according to claim 5, characterized in that the lower shell (14) is provided with a wire outlet hole (142), and two ends of a series circuit formed by a plurality of piezoelectric type horns (11) are connected with a constant voltage power amplifier after passing through the wire outlet hole (142) through a lead wire.

7. The loudspeaker according to claim 1, wherein each piezoelectric horn (11) is rated at 20V, the output voltage of the constant voltage power amplifier is 120V, and the number of the piezoelectric horns (11) is 6.

8. The loudspeaker according to claim 1, wherein a plurality of piezoelectric type horns (11) are sequentially connected in series to form a horn assembly, the loudspeaker comprises a plurality of horn assemblies, and two ends of each horn assembly are connected with two output ends of the constant voltage power amplifier.

9. A broadcast system comprising a loudspeaker according to any one of claims 1 to 8.

10. The broadcasting system of claim 9, wherein the broadcasting system comprises a plurality of speakers, the broadcasting system further comprises an audio source and a constant voltage power amplifier, each of the speakers is connected to the constant voltage power amplifier, and the constant voltage power amplifier amplifies and outputs a signal from the audio source to the plurality of speakers.