CN218124911U - Active ultralow frequency sound box - Google Patents

Abstract

The utility model discloses an active ultra-low frequency sound box, which comprises a box body and a base, wherein a loudspeaker unit is connected in the inner cavity of the box body, the outer end of a basin frame of the loudspeaker unit is connected in a mounting hole at the bottom of the box body, and the opening of a conical paper basin in the basin frame is arranged downwards; a radiation space is arranged between the base and the bottom of the box body; the top of the base is provided with a protruding part protruding upwards, and the top of the protruding part extends upwards through the opening of the conical cone and is arranged in the conical cone; an annular compression cavity is formed between the outer side wall of the protruding part and the inner wall of the conical cone, and the periphery of the compression cavity is communicated with the radiation space; an air inlet and outlet is arranged on the box body, and an inverter tube communicated with the air inlet and outlet is connected in the box body. The active ultra-low frequency sound box can effectively reduce standing wave distortion, does not influence the smoothness of sound wave radiation, improves the smoothness of a loudspeaker unit, and has powerful bass dynamics and high sound reproduction quality.

Description

Active ultralow frequency sound box

Technical Field

The utility model relates to a sound equipment technical field, what specifically say is an active ultralow frequency stereo set.

Background

Sound generally refers to a set of audio systems that make sound by an electrical apparatus; with the progress of society and the development of science and technology, people pursue higher and higher quality of life. After work, people need wonderful music and various types of sings and dances to relieve work fatigue, so that people can relax and feel pleasurable; the sound system is continuously improved and perfected along with the requirements of people, so that the sound system can meet the field sound amplification requirement of tens of thousands of people in a concert, and can meet the requirements of playing musical instruments and singing in individual families. In the sound technology, the pitch of sound, that is, the intensity and amplitude of audio frequency, is one of the important indexes for evaluating the sound quality of sound, that is, whether the pitch has a certain intensity relative to a certain frequency or frequency band, and whether the amplitude of each frequency point is uniform, balanced and full, whether the frequency influence curve is straight, and whether the accuracy of sound is accurate are determined within a required frequency range and at the same volume.

The audio frequency of the active sound can be divided into extremely low frequency, middle and low frequency, intermediate frequency, middle and high frequency, high frequency and extremely high frequency, wherein the frequency of the extremely low frequency is between 20Hz and 40Hz, the frequency band is also called as ultra low frequency, the sound of the frequency band can express the low frequency component of music, and the appreciation person can feel powerful and dynamic. The structure of the active ultra-low frequency sound box in the prior art generally comprises a box body, an active power amplifier, a loudspeaker and the like which are arranged in the box body, wherein a vibrating diaphragm of the loudspeaker generates piston-like motion to generate sound waves under the mutual inductance action of a voice coil of the loudspeaker and a driving magnet, and the generated sound waves radiate outwards to form sound; however, not all sound waves are directly diffused outwards, and part of the sound waves are sent to the ears of the listener after being reflected on the diaphragm in a cross way, that is, when the sound waves are reflected on the diaphragm in a cross way, the sound waves are reflected from one side of the diaphragm to the other side of the diaphragm and then reflected to the ears of the listener, and since the sound waves are generated at the same time but are heard at different times, standing wave distortion is caused, so that the smoothness of sound wave radiation is influenced, and an off-axis frequency response peak-valley phenomenon often occurs in the loudspeaker. In order to solve the problem of standing wave distortion, a phase plug is generally installed at a dust cover in the center of a loudspeaker in the prior art, or the phase plug is installed at the outer end of the loudspeaker, as disclosed in chinese patent application No. CN204425646U, the phase plug aims to enable sound waves reflected by vibration of a loudspeaker diaphragm to contact with the surface of the phase plug, and secondary reflected waves of the sound waves are emitted from the surface of the phase plug, so that the delay time of sound wave emission is shortened, and thus the standing wave distortion is reduced. However, the active ultralow frequency sound standing wave distortion in the prior art is still serious, and particularly, the intensity of bass is not powerful enough, and the sound reproduction quality is poor.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is, overcome the defect of above prior art, provide one kind and can effectively reduce the standing wave distortion, do not influence the smooth nature of sound wave radiation, promote speaker unit cisternate, and the bass dynamics is powerful, the active ultralow frequency stereo set that the sound playback quality is high.

The technical solution of the utility model is that, an active ultralow frequency stereo set with following structure is provided: it comprises

The loudspeaker box comprises a box body, a loudspeaker unit and a cone frame, wherein an inner cavity is formed in the box body in a hollow mode, a mounting hole communicated with the inner cavity is formed in the bottom of the box body, the loudspeaker unit is connected in the inner cavity, the outer end of the cone frame of the loudspeaker unit is connected in the mounting hole, and an opening of a conical cone in the cone frame faces downwards;

the base is arranged below the box body and connected with the bottom of the box body, and a radiation space for radiating sound waves of the loudspeaker unit to the periphery is formed between the base and the bottom of the box body; an active power amplifier is installed in the base and electrically connected with the loudspeaker unit; the top of the base below the opening of the conical cone is provided with a protruding part protruding upwards, and the top of the protruding part extends upwards through the opening of the conical cone and is arranged in the conical cone; an annular compression cavity is formed between the outer side wall of the protruding part and the inner wall of the conical cone, and the periphery of the compression cavity is communicated with the radiation space;

the air inlet and outlet holes are formed in the box body, the phase inversion pipe is connected in the box body, the first end of the phase inversion pipe is communicated with the inner cavity of the box body, and the second end of the phase inversion pipe is communicated with the air inlet and outlet holes.

After the structure more than adopting, the utility model relates to an active ultralow frequency stereo set compares with prior art, has following advantage: firstly, the opening of the cone paper cone of the active ultra-low frequency sound speaker unit is arranged downwards, sound waves generated by the speaker unit are radiated and diffused outwards from the periphery of a radiation space after being compressed to a certain extent with the top of the base in the radiation space, so that the strength of the sound is more vigorous, powerful and deep; furthermore, the protruding part at the top of the base extends upwards through the opening of the cone-shaped cone and is arranged in the cone-shaped cone, an annular compression cavity is formed between the outer side wall of the protruding part and the inner wall of the cone-shaped cone, the cone-shaped cone vibrates reflected sound waves, a part of the sound waves enter the radiation space through the compression cavity and radiate and diffuse outwards, the other part of the sound waves are contacted with the outer side wall of the protruding part, and the outer side wall of the protruding part is equivalent to a phase plug, so that secondary reflection waves of the sound waves are quickly reflected into the radiation space by the outer side wall of the protruding part and radiate and diffuse outwards, the delay time of sound wave emission is reduced, the standing wave distortion is effectively reduced, and the sound reproduction quality is high; the arrangement of the protruding part extending into the conical cone compresses the sound radiation space in the conical cone, effectively shortens the reflection time of sound waves, balances the air pressure in the front and the back of the conical cone of the loudspeaker unit, and further reduces sound distortion. Secondly, the utility model arranges the protruding part equivalent to the phase plug on the base, the protruding part extends into the cone-shaped cone, and an annular compression cavity is formed between the protruding part and the cone-shaped cone, namely, the lower end of the compression cavity is open without shielding; compared with the prior art, the cylindrical phase plug is arranged at the center of the conical cone, and the protruding part completely separates the space in the conical cone, so that the sound wave is completely prevented from being reflected to the other side of the surface of the conical cone from one side of the surface of the conical cone, and the delay time of sound wave emission is effectively reduced; compared with the prior art, the phase plug partially extending into the cone is arranged at the outer end of the cone frame of the loudspeaker unit (see the Chinese patent application with the publication number of CN 204425646U), on one hand, the sound waves are completely prevented from being reflected to the other side of the surface of the cone from one side of the surface of the cone, the delay time of sound wave emission is reduced, on the other hand, the compression cavity formed between the protruding part and the inner wall of the cone can compress the reflected sound waves, so that the bass effect is stronger, and moreover, the lower end of the compression cavity is completely opened without shielding, the smoothness of sound wave radiation is not influenced, the smoothness of the loudspeaker unit is effectively improved, the off-axis frequency response peak valley phenomenon frequently occurring in the loudspeaker unit is avoided, and the tone is pure and natural. In addition, the inverter tube mainly functions to increase the low-frequency radiation energy of sound, and when the cone-shaped cone of the loudspeaker unit vibrates, sound waves with opposite phases are generated on the front surface and the back surface of the cone-shaped cone. The direct sound waves generated on the front side of the loudspeaker unit are directly radiated to the external space, the sound waves generated on the back side of the loudspeaker enter the phase reversal tube under the action of pressure difference and are radiated to the external space through the second end of the phase reversal tube or the air inlet and outlet, and the reversed sound waves generated on the back side of the conical cone form reversed sound waves with the same phase as the direct sound waves after the action of the phase reversal tube, so that the sound wave radiation and the low-frequency sound reproduction capability are enhanced; therefore, the active ultralow frequency sound box has stronger and powerful bass dynamics and good sound effect.

Preferably, the outer side wall of the protruding part is tapered in a small-top and large-bottom manner, and the taper of the outer side wall of the protruding part is the same as that of the inner wall of the cone, so that the distance between the outer side wall of the protruding part and the inner wall of the cone is the same. The arrangement makes the time difference of the sound waves reflected by different positions of the cone-shaped cone reaching the outer side wall of the protruding part small, or the distance between the outer side wall of the protruding part and the inner wall of the cone-shaped cone is the same, so that the time of the sound waves reflected by the inner wall of the cone-shaped cone transmitting in the annular compression space is the same or the time difference is small, the standing wave distortion is further reduced, and the sound reproduction quality is high.

Preferably, the outer side wall of the dustproof cap at the center of the conical cone is provided with an inwards concave arc surface, the top wall of the protruding part is provided with an upwards convex arc surface, and the radian of the top wall of the protruding part is matched with that of the dustproof cap, so that the distance between the top wall of the protruding part and the outer side wall of the dustproof cap is the same; the distance between the outer side wall of the protruding portion and the inner wall of the conical cone is equal to the distance between the top wall of the protruding portion and the outer side wall of the dustproof cap. Set up like this, make the width at annular compression chamber top unanimous, the width at annular compression chamber lateral part and top is unanimous moreover, consequently, makes the space in the annular compression chamber more even, and the air thickness in the annular compression chamber is unanimous, atmospheric pressure around can the fine balanced toper cone, further reduces the lag time of sound wave transmission moreover, improves the speaker unit cissexuality.

Preferably, the projection of the opening of the cone-shaped cone in the vertical direction completely covers the protrusion. Set up like this, not only be favorable to the outside radiation diffusion of the sound wave that the toper cone reflected, and the equal direct contact lateral wall of protruding portion of sound wave that the toper cone surface did not reflect carries out the secondary reflection and launches, further reduces the standing wave distortion, and makes the structure of stereo set compacter.

Preferably, the protruding portion and the base top wall are of an integrally formed structure, and a receiving cavity matched with the shape of the protruding portion is formed in the back surface of the protruding portion. Due to the fact that the active power amplifier and other control components are installed in the base, the installation space in the base is enlarged due to the arrangement of the accommodating cavity, the active power amplifier, the control circuit board and the like in the base can be conveniently installed, and heat dissipation is facilitated.

Preferably, the bottom of the base is connected with a sucker assembly. The sucker component improves the stability and firmness of connection between the base of the active ultralow frequency sound box and the ground, the table top or the table top, and avoids shaking.

Preferably, the outer edge of the top of the base is provided with a plurality of connecting columns which are distributed along the circumferential direction of the base and extend upwards, and the top of each connecting column is connected with the bottom of the box body, so that the radiation space is formed between the bottom of the box body and the top of the base. Set up like this, the sound wave that speaker unit produced can be in bottom half outwards radiation diffusion simultaneously all around to make good, the tone quality is higher, purer of audio.

As preferred, be connected with the installing support in the inner chamber of box, the installing support will the inner chamber separates into two air chambers that link up each other from bottom to top in proper order: first air chamber and second air chamber, the speaker unit is installed on the installing support, and the toper cone back of speaker unit is located first air intracavity, the business turn over gas pocket sets up on one of them lateral wall of box, and with second air chamber intercommunication. Therefore, the air inlet and outlet holes are different from the conical cone of the loudspeaker unit in opening direction, namely the air inlet and outlet holes are horizontal, and the conical cone of the loudspeaker unit is vertical downwards in opening direction, so that the sound waves radiated by the loudspeaker unit and the sound waves radiated by the air inlet and outlet holes can be effectively prevented from being mutually offset to form sound short circuit, and the sound distortion is reduced.

Preferably, the inverter tube is arranged in an S shape as a whole, and the inner wall of the inverter tube is in smooth transition. The S-shaped inverter tube not only arranges the inverter tube with longer length in the limited box space, but also has smaller volume under the condition that the length of the inverter tube is consistent compared with the similar products; the S-shaped inverter tube can increase the whole length of the inverter tube in one direction as much as possible, the low-frequency submergence of the inverter tube is improved, and the smooth transition of the inner wall of the S-shaped inverter tube, particularly the turning part, is favorable for reducing wind noise between air and the inner wall of the pipeline, so that sound distortion is avoided, and the sound pollution is reduced.

Preferably, the phase inversion pipe comprises a first straight pipe part, a first bent pipe part, a second straight pipe part, a second bent pipe part and a throat pipe part from inside to outside in sequence;

the inlet of the first end of the first straight pipe part is communicated with the second air cavity, the second end of the first straight pipe part is tangent to the first end of the first bent pipe part and is in smooth transition, the second end of the first bent pipe part is tangent to the first end of the second straight pipe part and is in smooth transition, the second end of the second straight pipe part is tangent to the first end of the second bent pipe part and is in smooth transition, and the second end of the second bent pipe part is in smooth transition with the throat pipe part; wherein, the first and the second end of the pipe are connected with each other,

the included angle between the center line of the first straight pipe part and the center line of the second straight pipe part is 10-20 degrees; the first bent pipe part and the second bent pipe part are arranged symmetrically about the center of the second straight pipe part;

the throat part is in a horn shape with a small inside and a large outside, and an outlet at the outer end of the throat part is communicated with the air inlet and outlet hole; and the number of the first and second groups,

the outlet of the outer end of the throat part is positioned in the center of the width direction of the phase inverter tube. The S-shaped phase reversal tube is compact in structure, the overall length of the phase reversal tube in one direction is longer, and the low frequency of sound waves in the phase reversal tube sinks deeper, so that the sound wave radiation and low frequency sound reproduction capability are further enhanced; in addition, the first bent pipe part and the second bent pipe part are smoothly connected with the first straight pipe part and the second straight pipe part, so that wind noise between air and the inner wall of the pipeline is further reduced, sound distortion is avoided, and sound pollution is reduced. Furthermore, the included angle between the center line of the first straight pipe part and the center line of the second straight pipe part is 10-20 degrees, and the first bent pipe part and the second bent pipe part are symmetrically arranged relative to the center of the second straight pipe part; the S-shaped inverter tube has a more compact structure and a smaller volume, and the length of the inverter tube in a single direction can be set longer under the condition that the whole width and the whole length of the inverter tube are not changed.

Drawings

Fig. 1 is a schematic structural diagram of the active ultra-low frequency audio of the present invention.

Fig. 2 is a schematic front view of the active ultra-low frequency audio of the present invention.

Fig. 3 is a schematic diagram of an assembly structure of the active ultra-low frequency audio of the present invention.

Fig. 4 is a schematic view of another angle assembly structure of the active ultra low frequency audio of the present invention.

Fig. 5 is a schematic cross-sectional structure diagram of the active ultra low frequency sound box of the present invention.

Fig. 6 is a schematic sectional view showing an assembled state of the active ultra low frequency audio of the present invention.

Fig. 7 is a schematic structural diagram of an inverter tube of the active ultra low frequency sound of the present invention.

Fig. 8 is a schematic front view of an inverter tube of the active ultra low frequency audio of the present invention.

As shown in the figure:

1. the loudspeaker comprises a box body, 100, an inner cavity, 101, a mounting hole, 102, a mounting bracket, 103, a first air cavity, 104, a second air cavity, 105, an air inlet and outlet hole, 2, a base, 200, a protruding part, 201, a connecting column, 202, a switch, 203, a power socket, 204, a sucker component, 205, a containing cavity, 206, an active power amplifier, 3, a radiation space, 4, a loudspeaker unit, 400, a basin frame, 401, a cone-shaped cone, 402, a dustproof cap, 5, a compression cavity, 6, an inverter tube, 600, a first straight tube, 601, an inlet, 602, a first bent tube part, 603, a second straight tube, 604, a second bent tube part, 605, a throat part, 606 and a mounting flange.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

See fig. 1-8;

the embodiment of the utility model discloses an active ultra-low frequency sound box, which comprises a box body 1 and a base 2 which is arranged below the box body 1 and is connected with the bottom of the box body 1; the interior of the box body 1 is hollow and is provided with an inner cavity 100, the bottom of the box body 1 is provided with a mounting hole 101 communicated with the inner cavity 100, the inner cavity 100 is internally connected with a loudspeaker unit 4, the outer end of a basin frame 400 of the loudspeaker unit 4 is connected in the mounting hole 101, and an opening of a conical cone 401 in the basin frame 400 faces downwards; the speaker unit 4 of this embodiment is an electroacoustic transducer, and its structure generally includes a magnet, a frame 400, a centering pad, a voice coil, a cone 401, and the like, and when an audio current flows through the voice coil in a magnetic field, a magnetic field varying with the audio current is generated, and this magnetic field interacts with the magnetic field of the permanent magnet to vibrate the voice coil in the axial direction, so that the cone 401 vibrates to produce sound. Which is a prior art product and this embodiment will not be described in detail. The outer edge of the top of the base 2 is provided with a plurality of connecting columns 201 which are distributed along the circumferential direction of the base 2 and extend upwards, and the tops of the connecting columns 201 are connected with the bottom of the box body 1, so that a gap is formed between the bottom of the box body 1 and the top of the base 2, and the gap forms a radiation space 3 for radiating sound waves of the loudspeaker unit 4 to the periphery; in the embodiment, the box body 1 and the base 2 are both square, so four corners of the top of the base 2 are provided with four connecting columns 201, the radiation space 3 is communicated with the outside through gaps among the connecting columns 201, and thus sound waves of the speaker unit 4 can radiate and diffuse outwards from the periphery of the radiation space 3; in other embodiments, the box 1 and the base 2 may be configured in a cylindrical shape, a polygonal shape, or the like.

Referring to fig. 4, in the present embodiment, since the mounting hole 101 is disposed at the center of the bottom of the cabinet 1, the speaker unit 4 is disposed vertically downward, and the sound wave generated by the speaker unit 4 is compressed with the top of the base 2 in the radiation space 3 to be radiated and diffused outward from the periphery of the radiation space 3, so that the sound is more vigorous and powerful, and is submerged.

Referring to fig. 3 to 5, in the present embodiment, an active power amplifier 206 is installed in the base 2, the active power amplifier 206 is also an active power amplifier or an active power amplifying circuit, and the active power amplifier 206 is electrically connected to the speaker unit 4; the base 2 is provided with a switch 202 and a power plug 203, and the power plug 203 is electrically connected with the active power amplifier 206; in other embodiments, a power supply can be installed in the base 2; the switch 202 is used for controlling the active ultralow frequency sound equipment to work; the top of the base 2 below the opening of the cone 401 of the speaker unit 4 is provided with a protrusion 200 protruding upward, the top of the protrusion 200 extends upward through the opening of the cone 401 and is arranged in the cone 401; an annular compression cavity 5 is formed between the outer side wall of the protruding part 200 and the inner wall of the conical cone 401, and the periphery of the compression cavity 5 is communicated with the radiation space 3. The cone-shaped cone 401 of the loudspeaker unit 4 vibrates the reflected sound waves, a part of the sound waves enter the radiation space 3 through the compression cavity 5 and radiate and diffuse outwards, the other part of the sound waves are contacted with the outer side wall of the projection 200, and the outer side wall of the projection 200 is equivalent to a phase plug, so that the outer side wall of the projection 200 quickly reflects the secondary reflected waves of the sound waves into the radiation space 3 and radiates and diffuses outwards, the delay time of sound wave emission is shortened, the standing wave distortion is effectively reduced, and the sound reproduction quality is high; the arrangement of the protruding portion 200 protruding into the cone-shaped cone 401 compresses the sound radiation space 3 in the cone-shaped cone 401, effectively shortens the reflection time of sound waves, equalizes the air pressure in front of and behind the cone-shaped cone 401 of the speaker unit 4, and further reduces sound distortion.

Referring to fig. 5 and 6 again, the protruding portion 200 corresponding to the phase plug of the present invention is disposed on the base 2, the protruding portion 200 extends into the cone 401, and an annular compression cavity 5 is formed between the protruding portion 200 and the cone 401, i.e. the lower end of the compression cavity 5 is open and has no shielding; therefore, the utility model discloses a cooperation structure between the protruding part 200 and the conical cone 401; compared with the prior art, as for the cylindrical phase plug is arranged at the center of the conical cone 401, the protruding part 200 completely separates the space in the conical cone 401, so that the sound wave is completely prevented from being reflected from one side of the surface of the conical cone 401 to the other side of the surface of the conical cone 401, and the delay time of sound wave emission is effectively reduced; compared with the prior art, the phase plug partially extending into the cone is mounted at the outer end of the cone frame 400 of the speaker unit 4 (see the phase plug described in the chinese patent application with publication number CN 204425646U), on one hand, the sound waves are completely prevented from being reflected from one side of the surface of the cone 401 to the other side of the surface of the cone 401, so that the delay time of sound wave emission is reduced, on the other hand, the compression cavity 5 formed between the protruding part 200 and the inner wall of the cone 401 can compress the reflected sound waves, so that the bass effect is stronger, furthermore, the lower end of the compression cavity 5 is completely open and is not shielded, so that the smoothness of sound wave radiation is not affected, the smoothness of the speaker unit 4 is effectively improved, off-axis frequency response peaks and valleys in the speaker unit 4 are avoided, the tone is pure and natural, and the quality of the sound is maintained.

Referring to fig. 5 again, in the present embodiment, the outer side wall of the protruding portion 200 at the top of the base 2 is tapered in a small top and a large bottom, that is, the outer side wall of the protruding portion 200 is a conical surface, and the taper of the outer side wall of the protruding portion 200 is the same as the taper of the inner wall of the cone 401, so that the distance between the outer side wall of the protruding portion 200 and the inner wall of the cone 401 is the same. Further, the outer side wall of the dust cap 402 in the center of the cone-shaped cone 401 is set to be an inward-concave arc surface, the top wall of the protrusion 200 is set to be an upward-convex arc surface, and the radian of the top wall of the protrusion 200 is matched with the radian of the dust cap 402, so that the distance between the top wall of the protrusion 200 and the outer side wall of the dust cap 402 is the same; in the present embodiment, the distance between the outer side wall of the protruding portion 200 and the inner wall of the cone 401 is equal to the distance between the top wall of the protruding portion 200 and the outer side wall of the dust cap 402. Therefore, the time difference of the reflected sound waves at different positions of the conical cone 401 reaching the outer side wall of the protruding part 200 is small, or the distance between the outer side wall of the protruding part 200 and the inner wall of the conical cone 401 is the same, so that the space in the annular compression cavity is more uniform, the thickness of air in the annular compression cavity is consistent, the air pressure in the front and at the back of the conical cone 401 can be well balanced, the delay time of sound wave emission is further reduced, and the compliance of the loudspeaker unit 4 is improved; thereby further reducing the standing wave distortion and providing a high sound reproduction quality.

In the present embodiment, the projection of the opening of the cone 401 in the vertical direction completely covers the protrusion 200, that is, the protrusion 200 is located in the projection of the opening of the cone 401 in the vertical direction. Therefore, the sound waves reflected by the conical cone 401 can be radiated and diffused outwards, and the sound waves which are not reflected by the surface of the conical cone 401 can directly contact the outer side wall of the protruding part 200 to be reflected and emitted for the second time, so that the standing wave distortion is further reduced, and the structure of the sound box is more compact.

In the present embodiment, the protruding portion 200 and the top wall of the base 2 are formed as an integral structure, and the back surface of the protruding portion 200 is formed with a receiving cavity 205 adapted to the shape of the protruding portion 200. Because electronic components such as the active power amplifier 206 and the control circuit board are installed in the base 2, the installation space in the base 2 is increased due to the arrangement of the accommodating cavity 205, so that the installation of the electronic components such as the active power amplifier 206 and the control circuit board in the base 2 is facilitated, and the heat dissipation of the electronic components is also facilitated.

Referring again to fig. 2 and 4, it can be understood that in order to improve the stability and firmness of the connection between the base 2 of the active ultra low frequency audio and the ground, the table top or the desktop, the generation of shaking is avoided. A suction cup assembly 204 is attached to the bottom of the base 2, the suction cup assembly 204 comprising a plurality of suction cups attached to the bottom of the base 2.

Referring again to fig. 5 and 6, as an embodiment of the present invention; be connected with installing support 102 in the inner chamber 100 of box 1, installing support 102 will inner chamber 100 separates into two air chambers that link up each other from bottom to top in proper order: a first air cavity 103 and a second air cavity 104, wherein the loudspeaker unit 4 is arranged on the mounting bracket 102, and the back surface of a conical cone 401 of the loudspeaker unit 4 is positioned in the first air cavity 103; the box body 1 is provided with an air inlet and outlet hole 105 communicated with the second air cavity 104, the second air cavity 104 is internally connected with an inverter tube 6, the first end of the inverter tube 6 is communicated with the second air cavity 104, the second end of the inverter tube 6 is provided with a mounting flange 606, and the mounting flange 606 is connected to the inner end of the air inlet and outlet hole 105 and enables the second end of the inverter tube 6 to be communicated with the air inlet and outlet hole 105. As is well known, when the cone-shaped cone 401 of the speaker unit 4 vibrates, sound waves having opposite phases are generated on the front and rear surfaces thereof. Direct sound waves generated on the front side of the loudspeaker unit 4 are directly radiated to an external space, sound waves generated on the back side of the loudspeaker enter the phase reversal tube 6 under the action of pressure difference and are radiated to the external space through the second end of the phase reversal tube 6 or the air inlet and outlet 105, and reverse sound waves generated on the back side of the conical cone 401 form reverse sound waves with the same phase as the direct sound waves after the action of the phase reversal tube 6, so that the sound wave radiation and the low-frequency sound reproduction capability are enhanced; therefore, the bass of the active ultra-low frequency sound box is stronger and powerful in strength and good in sound effect. In this embodiment, the air inlet/outlet 105 is disposed on one of the outer sidewalls of the box 1 and is communicated with the second air chamber 104; thus, the opening directions of the air inlet and outlet 105 and the conical cone 401 of the speaker unit 4 are different, that is, the opening direction of the air inlet and outlet 105 is horizontal, and the opening direction of the conical cone 401 of the speaker unit 4 is vertical and downward, so that the sound wave radiated by the speaker unit 4 and the sound wave radiated by the air inlet and outlet 105 can be effectively prevented from being mutually offset to form an acoustic short circuit, and the sound distortion is reduced.

Referring to fig. 7 and 8, in the present embodiment; the inverter tube 6 is arranged in S shape, and the inner wall of the inverter tube 6 is in smooth transition. The S-shaped inverter tube 6 not only can set the inverter tube 6 with longer length in the limited space of the box body 1, but also can make the volume of the box body 1 smaller under the condition that the length of the inverter tube 6 is consistent compared with the similar products; the S-shaped inverter tube 6 can increase the whole length of the inverter tube 6 in one direction as much as possible, the low-frequency submergence of the inverter tube 6 is improved, and the smooth transition of the S-shaped inverter tube 6, particularly the inner wall of a turning part, is beneficial to reducing wind noise between air and the inner wall of a pipeline, avoids sound distortion and reduces sound pollution.

Further, in the present embodiment; the inverter tube 6 comprises a first straight tube 600, a first bent tube 602, a second straight tube 603, a second bent tube 604 and a throat tube 605 from inside to outside in sequence; an inlet 601 of a first end of the first straight pipe 600 part is communicated with the second air cavity 104, a second end of the first straight pipe 600 part is tangent to and smoothly transits a first end of the first bent pipe part 602, a second end of the first bent pipe part 602 is tangent to and smoothly transits a first end of the second straight pipe 603 part, a second end of the second straight pipe 603 part is tangent to and smoothly transits a first end of the second bent pipe part 604, and a second end of the second bent pipe part 604 is smoothly transited to the throat part 605; the first straight pipe 600, the first bent pipe 602, the second straight pipe 603, the second bent pipe 604, and the throat 605 form the S-shaped inverter pipe 6. In this embodiment, the cross section of the inverter tube 6 is a rectangle with four rounded corners; in other embodiments, the inverter tube 6 may also have a circular, racetrack-shaped, etc. cross-section. Furthermore, the included angle a between the center line of the first straight tube 600 portion and the center line of the second straight tube 603 portion of the inverter tube 6 is 10 to 20 degrees, in this embodiment, the included angle a between the center line of the first straight tube 600 portion and the center line of the second straight tube 603 portion is 16 degrees; thus, the second straight pipe 603 is inclined with respect to the first straight pipe 600, and the space between the first bent pipe 602 and the second bent pipe 604 is made more compact. Further, the first bent pipe portion 602 and the second bent pipe portion 604 are disposed symmetrically with respect to the center of the second straight pipe portion 603; the throat part 605 is in a horn shape with a small inside and a large outside, and an outlet at the outer end of the throat part 605 is communicated with the air inlet and outlet 105; in this embodiment, the outer end outlet of throat section 605 is located at the center in the width direction of inverter tube 6. The S-shaped phase inversion tube 6 is compact in structure, the overall length of the phase inversion tube 6 in one direction is longer, and the low-frequency submergence of sound waves in the phase inversion tube 6 is deeper, so that the sound wave radiation and low-frequency sound reproduction capability are further enhanced; in addition, the first bent pipe part 602 and the second bent pipe part 604 are smoothly connected with the first straight pipe 600 and the second straight pipe 603, so that wind noise between air and the inner wall of the pipeline is further reduced, sound distortion is avoided, and sound pollution is reduced. The length of the inverter tube 6 in a single direction can be set longer without changing the overall width and length of the inverter tube 6. In the present embodiment, the overall width of inverter tube 6 is the distance from the outer edge of first bent tube portion 602 to the outer edge of second bent tube portion 604; the overall length of inverter tube 6 is the distance from the first end of first straight tube 600 to the second end of throat 605.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An active ultra low frequency sound box is characterized in that: it comprises

The loudspeaker box comprises a box body, a loudspeaker unit and a cone-shaped cone, wherein an inner cavity is arranged in the box body in a hollow mode, a mounting hole communicated with the inner cavity is formed in the bottom of the box body, the loudspeaker unit is connected in the inner cavity, the outer end of a cone frame of the loudspeaker unit is connected in the mounting hole, and an opening of the cone-shaped cone in the cone frame faces downwards;

the base is arranged below the box body and connected with the bottom of the box body, and a radiation space for radiating sound waves of the loudspeaker unit to the periphery is formed between the base and the bottom of the box body; an active power amplifier is installed in the base and electrically connected with the loudspeaker unit; the top of the base below the opening of the conical cone is provided with a protruding part protruding upwards, and the top of the protruding part extends upwards through the opening of the conical cone and is arranged in the conical cone; an annular compression cavity is formed between the outer side wall of the protruding part and the inner wall of the conical cone, and the periphery of the compression cavity is communicated with the radiation space;

the air inlet and outlet holes are formed in the box body, the phase inversion tube is connected in the box body, the first end of the phase inversion tube is communicated with the inner cavity of the box body, and the second end of the phase inversion tube is communicated with the air inlet and outlet holes.

2. The active ultra low frequency sound of claim 1, wherein: the lateral wall of protruding portion is big end down's toper, and the tapering of protruding portion lateral wall is the same with the tapering of toper cone inner wall, makes the interval between protruding portion lateral wall and the toper cone inner wall the same.

3. The active ultra low frequency sound of claim 2, wherein: the outer side wall of the dustproof cap in the center of the conical paper cone is provided with an inward-concave cambered surface, the top wall of the protruding part is provided with an upward-convex cambered surface, and the radian of the top wall of the protruding part is matched with that of the dustproof cap, so that the distance between the top wall of the protruding part and the outer side wall of the dustproof cap is the same; the distance between the outer side wall of the protruding portion and the inner wall of the conical cone is equal to the distance between the top wall of the protruding portion and the outer side wall of the dustproof cap.

4. The active ultra low frequency sound of claim 2, wherein: the projection of the opening of the conical cone in the vertical direction completely covers the protruding part.

5. The active ultra low frequency sound box according to any one of claims 1 to 4, wherein: the protruding portion and the top wall of the base are of an integrally formed structure, and an accommodating cavity matched with the protruding portion in shape is formed in the back of the protruding portion.

6. The active ultra low frequency sound of claim 5, wherein: the bottom of the base is connected with a sucker component.

7. The active ultra low frequency sound of claim 1, wherein: the top outer fringe of base is equipped with a plurality of spliced poles that distribute and upwards extend the setting along base circumference, the top of spliced pole is connected with the bottom of box, makes to form between the bottom of box and the top of base the radiation space.

8. The active ultra low frequency sound of claim 1, wherein: be connected with the installing support in the inner chamber of box, the installing support will the inner chamber separates into two air chambers that link up each other from bottom to top in proper order: first air chamber and second air chamber, the speaker unit is installed on the installing support, and the toper cone back of speaker unit is located first air intracavity, the business turn over gas pocket sets up on one of them lateral wall of box, and with second air chamber intercommunication.

9. The active ultra low frequency sound of claim 1, wherein: the phase inverter tube is integrally arranged in an S shape, and the inner wall of the phase inverter tube is in smooth transition.

10. The active ultra low frequency sound of claim 9, wherein: the phase-reversing pipe comprises a first straight pipe part, a first bent pipe part, a second straight pipe part, a second bent pipe part and a throat pipe part from inside to outside in sequence;

an inlet of the first end of the first straight pipe part is communicated with the second air cavity, a second end of the first straight pipe part is tangent to and smoothly transits with the first end of the first bent pipe part, a second end of the first bent pipe part is tangent to and smoothly transits with the first end of the second straight pipe part, a second end of the second straight pipe part is tangent to and smoothly transits with the first end of the second bent pipe part, and a second end of the second bent pipe part is smoothly transited with the throat pipe part; wherein, the first and the second end of the pipe are connected with each other,

the included angle between the center line of the first straight pipe part and the center line of the second straight pipe part is 10-20 degrees; the first bent pipe part and the second bent pipe part are symmetrically arranged relative to the center of the second straight pipe part;

the throat part is in a horn shape with a small inside and a large outside, and an outlet at the outer end of the throat part is communicated with the air inlet and outlet hole; and (c) a second step of,

the outlet of the outer end of the throat part is positioned in the center of the width direction of the inverter tube.

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