CN110933568A

CN110933568A - Speaker and audio device

Info

Publication number: CN110933568A
Application number: CN201911258474.5A
Authority: CN
Inventors: 王伟
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-03-27

Abstract

The invention discloses a loudspeaker, which comprises a vibration assembly, a loudspeaker shell and a loudspeaker shell, wherein the vibration assembly comprises a voice coil; further comprising: the washer is arranged close to the vibration assembly; the yoke iron bracket is arranged far away from the vibration component; the magnet is arranged between the washer and the yoke bracket; and a micro heat pipe, which is arranged in the magnet in a penetrating way, the interior of the micro heat pipe is filled with a refrigerant, and the micro heat pipe comprises: the evaporation end is embedded into the washer; the condenser end, the condenser end is embedded into the yoke support, and when the speaker worked, china department and magnet absorbed the heat that the vibration subassembly released and transmitted to the evaporation end of little heat pipe, and the refrigerant vaporization in the little heat pipe flows to the condenser end, and the yoke support absorbs the heat of condenser end release and outwards releases. An audio device is also disclosed. The invention improves the overall heat dissipation efficiency of the loudspeaker, ensures that the temperature in the loudspeaker does not rise excessively, and improves the working stability of the loudspeaker.

Description

Speaker and audio device

Technical Field

The invention belongs to audio equipment, and particularly relates to a loudspeaker and audio equipment with the loudspeaker.

Background

Moving coil loudspeakers are acoustic transducers that convert electrical energy into acoustic energy. One disadvantage of moving coil speakers is that they have a low acoustic energy conversion efficiency and a high thermal energy conversion efficiency, i.e., more than 90% of their electrical energy is converted into thermal energy. This leads to an increase in the temperature inside the loudspeaker and the following risks: 1. causing high temperature failure of the voice coil adhesive layer; 2. high temperature failure of the voice coil diaphragm adhesive; 3. and (5) demagnetizing the magnet at high temperature. The consequence of above leading to because of high temperature can make the speaker product receive the damage, especially moving coil speaker product adopts airtight structure at present more, in time transmits the inside heat to the external world and can reach the purpose of product protection.

The existing loudspeaker mainly adopts two modes of heat conduction and heat convection for heat dissipation. The heat conduction means that heat generated by the system is transferred to the magnetic circuit system, and the heat is dissipated through the magnetic circuit system. This way, heat is transferred from a high temperature object to a low temperature object by means of the temperature difference between the system and the magnetic circuit. But as the temperature of the magnetic circuit system increases, the heat conduction pattern gradually weakens. The thermal convection is to open a hole on the magnetic circuit system to enhance air flow and thermal convection. However, most speaker products are of a closed structure, and open-hole heat dissipation cannot be achieved. At the same time, the openings can affect the acoustic properties of the product, making the convection enhancement effect impractical.

The existing moving coil loudspeaker product, especially a loudspeaker applied to an intelligent terminal, has smaller and smaller volume and higher power of the loudspeaker, so that the heat dissipation problem of the moving coil loudspeaker cannot be ignored.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.

Disclosure of Invention

The invention designs and provides a brand-new loudspeaker aiming at the problem of low heat dissipation efficiency of heat conduction and heat convection modes adopted by heat dissipation of a moving coil loudspeaker in the prior art.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

a speaker includes a vibration assembly including a voice coil; further comprising: the washer is arranged close to the vibration assembly; the yoke iron bracket is arranged far away from the vibration component; the magnet is arranged between the washer and the yoke bracket; and a micro heat pipe, which is arranged in the magnet in a penetrating way, the interior of the micro heat pipe is filled with a refrigerant, and the micro heat pipe comprises: the evaporation end is embedded into the washer; the condenser end, the condenser end is embedded into the yoke support, and when the speaker worked, china department and magnet absorbed the heat that the vibration subassembly released and transmitted to the evaporation end of little heat pipe, and the refrigerant vaporization in the little heat pipe flows to the condenser end, and the yoke support absorbs the heat of condenser end release and outwards releases.

Furthermore, the washer is arranged around the micro heat pipe, and the evaporation end of the micro heat pipe protrudes out of the surface of one side of the washer, which is close to the vibration assembly.

Furthermore, the yoke support surrounds the micro heat pipe, and the condensation end of the micro heat pipe protrudes out of the surface of one side of the yoke support, which is far away from the vibration component.

In order to release the transferred heat to the external space as soon as possible, the method further comprises the following steps:

the heat dissipation plate is arranged on one side, away from the washer, of the yoke support, and the surface of one side, away from the vibration assembly, of the heat dissipation plate is flush with the end face of the condensation end; or the end surface of the condensation end is embedded in the heat dissipation plate.

In order to improve the heat conduction efficiency, the surface of the washer is provided with a heat absorption layer.

In order to improve the heat conduction efficiency, the surface of the heat dissipation plate is provided with a heat dissipation layer.

Optionally, the heat absorbing layer and/or the heat dissipating layer is an electroplated black coating.

As an alternative, an internal magnetic circuit is arranged in the loudspeaker; the magnet comprises a permanent magnet, the permanent magnet is arranged between the washer and the yoke support, and the micro heat pipe sequentially penetrates through the washer, the permanent magnet, the yoke support and the heat dissipation plate.

As another alternative, an external magnetic type magnetic circuit is arranged in the loudspeaker; the magnet comprises two permanent magnets which are arranged at intervals, and the permanent magnets are arranged between the washer and the yoke support and are symmetrically distributed along the central column of the yoke support; the two groups of micro heat pipes respectively penetrate through the washer, one of the permanent magnets, the yoke iron bracket and the heat dissipation plate in sequence.

Another aspect of the invention provides an audio device comprising a speaker, the speaker comprising a vibration assembly, the vibration assembly comprising a voice coil; further comprising: the washer is arranged close to the vibration assembly; the yoke iron bracket is arranged far away from the vibration component; the magnet is arranged between the washer and the yoke bracket; and a micro heat pipe, which is arranged in the magnet in a penetrating way, the interior of the micro heat pipe is filled with a refrigerant, and the micro heat pipe comprises: the evaporation end is embedded into the washer; the condenser end, the condenser end is embedded into the yoke support, and when the speaker worked, china department and magnet absorbed the heat that the vibration subassembly released and transmitted to the evaporation end of little heat pipe, and the refrigerant vaporization in the little heat pipe flows to the condenser end, and the yoke support absorbs the heat of condenser end release and outwards releases.

Compared with the prior art, the invention has the advantages and positive effects that:

according to the loudspeaker structure disclosed by the invention, when the loudspeaker works, as the washer is close to the vibration component, the washer and the magnet absorb heat released by the vibration component and transmit the heat to the evaporation end of the micro heat pipe, and a refrigerant in the micro heat pipe is vaporized and flows to the condensation end. The gaseous refrigerant exothermically condenses at the condensing end. Since the condensation end is embedded into the yoke bracket, the yoke bracket absorbs the heat released from the condensation end and releases the heat outwards. Through such a cycle, it is possible to continuously transmit heat generated from the heat source in the speaker from the inside of the speaker to the outside of the speaker, thereby ensuring that the temperature in the speaker does not excessively rise.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

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 embodiments are briefly introduced below, and it is obvious that the drawings in the following description are 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 first embodiment of a speaker according to the present invention;

FIG. 2 is a schematic structural diagram of the micro heat pipe shown in FIG. 1;

FIG. 3 is a schematic structural diagram of the heat dissipation related components shown in FIG. 1;

fig. 4 is a schematic structural diagram of a speaker according to a second embodiment of the present invention.

Detailed Description

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

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

A new design of loudspeaker 10 is shown in fig. 1. this loudspeaker 10 has better heat dissipation properties and is particularly suitable for use in a sealed condition. In principle, the loudspeaker 10 has a vibrating component therein. The vibration assembly is mainly constituted by the voice coil 12. Once the voice coil 12 is forced to move, the magnetic lines of force in the loudspeaker 10 are cut, so that an induced electromotive force is generated in the voice coil 12, further a driving force is generated, and the diaphragm 11 is driven to vibrate, and sound waves are radiated to the surrounding air medium. In order to solve the problem that the induced electromotive force is generated, which may increase the internal temperature of the speaker 10, that is, the heat generated by the vibration component is dissipated, in the present embodiment, the following structure is specially designed.

Referring to the arrangement position of the vibration assembly, as shown in fig. 1 to 3, the washer 13 is arranged on the side close to the vibration assembly, the yoke bracket 18 is arranged on the side away from the vibration assembly, and the magnet 14 is arranged between the washer 13 and the yoke bracket 18. Since the washer 13 and the yoke bracket 18 are generally used to have a certain thermal conductivity, the washer 13 near one end of the vibration assembly can absorb the heat generated by the vibration assembly and dissipate the heat to the outside through the yoke bracket 18. The washer 13 absorbs a certain amount of heat, the temperature rises, the heat conduction effect is reduced, in order to keep the high-efficiency heat absorption performance, the micro heat pipe 15 is specially designed, the inside of the micro heat pipe 15 is filled with a refrigerant, an evaporation end 16 and a condensation end 17 are respectively formed at the two ends of the micro heat pipe 15, and the micro heat pipe 15 is integrally arranged in the magnet 14 in a penetrating mode. The evaporation end 16 is embedded in the washer 13, the condensation end 17 is embedded in the yoke support 18, and when the temperature of the washer 13 rises, the heat absorbed by the washer 13 is further transferred to the evaporation end 16. The refrigerant at the evaporation end 16 absorbs heat and vaporizes into gaseous refrigerant, and flows from the evaporation end 16 to the condensation end 17. Meanwhile, due to the temperature difference effect, the magnet 14 can conduct the absorbed partial heat to one end of the yoke support 18, and finally, on the side away from the vibration component, the yoke support 18 and the condensation end 17 release the heat to the outside together, so that the problem of high temperature rise in the loudspeaker 10 is solved.

The micro heat pipe 15 conducts heat based on the principle that, as shown in fig. 2, the micro heat pipe 15 has a tubular sealed case 21, inside which a capillary structure is formed, and a refrigerant flows in the case 21. The refrigerant is kept in a saturated state in the shell 21, when the evaporation end 16 is heated, the refrigerant absorbs heat to be vaporized, the gaseous refrigerant flows from the evaporation end 16 to the condensation end 17 to be condensed in a heat release manner, and the condensed liquid refrigerant flows back to the evaporation end 16 due to the action of a capillary structure to complete a refrigeration cycle. In this embodiment, the micro heat pipes 15 may be individually arranged or may be arranged in groups, so as to achieve heat dissipation effects with different heat dissipation efficiencies. The capillary structure in the micro-heat pipe 15 is the sharp corner region of the channel in the pipe, i.e. the corner region of the housing. It is theorized that common channel configurations include triangular, rectangular, and irregular cross-sections, so long as the sharp corner regions are non-circular interfaces that provide the capillary force necessary for reflow. The shape of the sharp corner regions of the channels is not further defined herein.

When the loudspeaker 10 works, as the washer 13 is close to the vibration component, the washer 13 and the magnet 14 absorb the heat released by the vibration component and transmit the heat to the evaporation end 16 of the micro heat pipe 15, and the refrigerant in the micro heat pipe 15 is vaporized and flows to the condensation end 17. The gaseous refrigerant exothermically condenses at the condensation end 17. Since the condensation end 17 is embedded in the yoke bracket 18, the yoke bracket 18 absorbs the heat released from the condensation end 17 and releases it to the outside. By such a cycle, it is possible to continuously transmit the heat generated from the heat source in the speaker 10 from the inside of the speaker 10 to the outside of the speaker 10, thereby ensuring that the temperature in the speaker 10 does not rise excessively.

As a main element for transferring heat, the evaporation end 16 of the micro heat pipe 15 preferably protrudes from one side surface of the washer 13 close to the vibration component. That is, compared with the heat absorbing surface of the washer 13, the evaporation end 16 is closer to the vibration component, and when absorbing heat, the heat absorbing efficiency of the evaporation end 16 is higher than that of the washer 13, so that the structure has better heat absorbing performance. The washer 13 is disposed entirely around the micro heat pipe 15, maintaining a generally centrally symmetrical configuration. The height of the evaporation end 16 protruding from the washer 13 is about one third of the height of the plate-shaped washer 13, so that the heat transfer function is fully performed while the acoustic performance of the loudspeaker 10 is not significantly affected.

On the other side, the condensation end 17 of the micro-heat pipe 15 also preferably protrudes from the surface of the yoke support 18 on the side away from the oscillating assembly. The yoke support 18 is disposed entirely around the micro heat pipe 15, and also maintains a centrally symmetrical structure as a whole. The height of the condensation end 17 protruding out of the yoke support 18 is substantially the same as the height of the evaporation end 16 protruding out of the washer 13, so as to ensure the flow uniformity of the refrigerant in the micro heat pipe 15, and the service life of the micro heat pipe 15 is longer.

At the heat radiating end, it is necessary to cause the heat absorbed by the yoke brackets 18 and the condensation end 17 to be efficiently released outward. On the basis of which a heat sink 19 is also provided. The heat dissipation plate 19 is arranged on one side of the yoke support 18 away from the washer 13 and completely covers the surface of one side of the yoke support 18 away from the washer 13. The surface of one side of the heat dissipation plate 19, which is far away from the vibration component, is flush with the end surface of the condensation end 17, so that the appearance of the loudspeaker 10 product is ensured; or the end surface of the condensation end is embedded in the heat dissipation plate, the heat dissipation plate 19 can completely wrap the side wall and the bottom surface of the condensation end 17, and the contact area between the condensation end 17 and the heat dissipation plate 19 is increased, so that the condensation end 17 can fully radiate heat to the heat dissipation plate 19.

The washer 13 and the heat dissipation plate 19 are further subjected to special surface treatment, a heat absorption layer is arranged on the surface of the washer 13, and a heat dissipation layer is arranged on the surface of the heat dissipation plate 19. The heat absorption layer and the heat dissipation layer are both black coatings manufactured by electroplating, and the heat absorption effect and the heat dissipation effect are enhanced. Besides the electroplating coating, the surfaces of the washer 13 and the heat dissipation plate 19 can be adhered with organic films to improve heat dissipation performance.

An internal magnetic circuit is employed in the loudspeaker 10 as shown in fig. 1 to 3. The magnet 14 in the internal magnetic circuit comprises a permanent magnet. The permanent magnet is arranged between the washer 13 and the yoke support 18, and the micro heat pipe 15 sequentially penetrates through the washer 13, the permanent magnet 14, the yoke support 18 and the heat dissipation plate 19. The speaker 10 is supported entirely by the frame 20. The micro heat pipes 15 may be individually arranged, or may be arranged in parallel in groups.

Another embodiment of a loudspeaker is shown in fig. 4, in which loudspeaker 20 an external magnetic circuit is used. The external magnetic circuit includes two

permanent magnets

341 and 342 spaced apart from each other. The

permanent magnets

341 and 342 are both disposed between the washer 33 and the yoke bracket 38 and symmetrically distributed along the center post of the yoke bracket 38. Aiming at an external magnetic circuit, a micro heat pipe 351 and a micro heat pipe 352 are specially designed, wherein the micro heat pipe 351 penetrates through the washer 33, the permanent magnet 341, the yoke bracket 38 and the heat dissipation plate 39, the evaporation end 361 of the micro heat pipe is embedded in the washer 33, and the condensation end 371 of the micro heat pipe is embedded in the yoke bracket 38; the micro heat pipe 352 passes through the washer 33, the permanent magnet 342, the yoke holder 38 and the heat dissipation plate 39, and the evaporation end 362 is also embedded in the washer 33 and the condensation end 372 is embedded in the yoke holder 38. Washer 33 is disposed adjacent the vibratory assembly and yoke support 38 is disposed remote from the vibratory assembly. The vibration assembly is also mainly composed of a voice coil 32, which drives the diaphragm 31 to vibrate. The speaker 20 is supported entirely by the frame 40. It will be understood by those skilled in the art that each of the micro heat pipes may be replaced by a set of micro heat pipes arranged in parallel.

Another aspect of the invention provides an audio device. A speaker is provided in the audio device. For the specific structure of the speaker, please refer to the detailed description of the two embodiments and the detailed description of the drawings in the specification, which are not repeated herein. The same technical effects can be achieved by the audio device provided with the loudspeaker. The audio device can be a headset, a sound box or a device for generating sound integrated in the intelligent terminal. Smart terminals include, but are not limited to, cell phones, tablets, handheld terminals, and wearable devices.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A loudspeaker comprising a vibration assembly, the vibration assembly comprising a voice coil; it is characterized by also comprising:

the washer is arranged close to the vibration assembly;

a yoke bracket disposed remotely from the vibration assembly;

the magnet is arranged between the washer and the yoke bracket; and

the micro heat pipe is arranged in the magnet in a penetrating way, a refrigerant is filled in the micro heat pipe, and the micro heat pipe comprises:

the evaporation end is embedded into the washer;

a condensing end embedded in the yoke bracket,

when the loudspeaker works, the washer and the magnet absorb heat released by the vibration component and transmit the heat to the evaporation end of the micro heat pipe, a refrigerant in the micro heat pipe is vaporized and flows to the condensation end, and the yoke iron bracket absorbs heat released by the condensation end and releases the heat outwards.

2. The loudspeaker of claim 1,

the washer is arranged around the micro heat pipe, and the evaporation end of the micro heat pipe protrudes out of the surface of one side, close to the vibration assembly, of the washer.

3. The loudspeaker of claim 1,

the yoke support surrounds the micro heat pipe, and the condensation end of the micro heat pipe protrudes out of the surface of one side, far away from the vibration component, of the yoke support.

4. A loudspeaker according to claim 2 or 3, further comprising:

the heat dissipation plate is arranged on one side, away from the washer, of the yoke support, the surface, away from the vibration assembly, of one side of the heat dissipation plate is flush with the end face of the condensation end,

or the end surface of the condensation end is embedded in the heat dissipation plate.

5. The loudspeaker of claim 4,

and a heat absorption layer is arranged on the surface of the washer.

6. The loudspeaker of claim 5,

and a heat dissipation layer is arranged on the surface of the heat dissipation plate.

7. The loudspeaker of claim 6,

the heat absorbing layer and/or the heat dissipation layer are/is an electroplating black coating.

8. The loudspeaker of claim 7,

an internal magnetic type magnetic circuit is arranged in the loudspeaker; the magnet comprises a permanent magnet, the permanent magnet is arranged between the washer and the yoke support, and the micro heat pipe sequentially penetrates through the washer, the permanent magnet, the yoke support and the heat dissipation plate.

9. The loudspeaker of claim 7,

an external magnetic type magnetic circuit is arranged in the loudspeaker; the magnets comprise two permanent magnets which are arranged at intervals, and the permanent magnets are arranged between the washer and the yoke support and are symmetrically distributed along the central column of the yoke support; and the two groups of micro heat pipes respectively penetrate through the washer, one of the permanent magnets, the yoke iron bracket and the heat dissipation plate in sequence.

10. Audio device, characterized in that it comprises a loudspeaker according to any one of claims 1 to 9.