Air pipe sound box

Abstract

The invention relates to the technical field of sound boxes, and provides an air duct sound box, which comprises a box body and a loudspeaker unit, and is characterized in that the box body comprises an upper shell and a lower shell, the upper shell and the lower shell are connected to define a mounting cavity, one side, far away from the lower shell, of the upper shell is provided with a mounting port and a resonance groove, the mounting port is communicated with the mounting cavity, and the resonance groove extends along the circumferential direction of the mounting port; the loudspeaker unit is installed in the installation cavity through the installation opening, and the loudspeaker unit seals the installation opening. The loudspeaker unit vibrates to send out sound waves, the sound waves are resonated in the resonance tank and then sent out, a new sound source is formed and overlaid with the sound waves sent out by the loudspeaker unit, gain or attenuation of a specific frequency band is achieved, a physical equalizer is formed through adjustment of a physical means, the reverberation effect is improved, and compared with an electronic equalizer, the structure is simple, and cost is low. According to the technical scheme, under the condition that electronic noise and distortion are not introduced, frequency spectrum balance of sound can be adjusted more naturally, music can be listened to be fuller and more stereoscopic, the sense of space is higher, and the immersion and expressive force of the music are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sound boxes, and in particular to a duct sound box. Background Art

[0002] The speaker unit of the speaker box drives the entire vibration system (including the diaphragm) to reciprocate through the coil under the Ampere force to achieve the purpose of reproducing sound. However, it is difficult for existing speakers to gain or attenuate a specific frequency band, and the reverberation effect needs to be improved. Summary of the invention

[0003] The purpose of the present invention is to provide a duct speaker, aiming to solve the technical problem that the reverberation effect of the existing speaker needs to be improved.

[0004] The present application provides a duct speaker, the duct speaker comprising:

[0005] The box body comprises an upper shell and a lower shell, wherein the upper shell and the lower shell are connected to enclose a mounting cavity, wherein a side of the upper shell away from the lower shell has a mounting opening and a resonance groove, wherein the mounting opening is communicated with the mounting cavity, and the resonance groove is extended along the circumference of the mounting opening;

[0006] The speaker unit is installed in the installation cavity through the installation opening, and the speaker unit seals the installation opening.

[0007] In one of the embodiments, the depth of the resonance groove is 10 mm to 25 mm.

[0008] In one of the embodiments, the folding ring of the speaker unit is 1 mm to 5 mm higher than the plane where the notch of the resonance slot is located.

[0009] In one embodiment, the length of the resonance slot is 10 cm to 20 cm.

[0010] In one embodiment, the length of the resonance groove is 6 to 15 times the groove depth of the resonance groove.

[0011] In one embodiment, the upper shell has a first spiral groove, the groove opening of the first spiral groove faces downward, and the top of the upper shell has an air outlet connected to the end of the first spiral groove; the lower shell has a second spiral groove, the groove opening of the second spiral groove faces upward, and the groove wall of the first spiral groove and the groove wall of the second spiral groove enclose a duct; the first end of the first spiral groove and / or the second spiral groove has an air inlet, and the air inlet and the air outlet are respectively located at two ends of the duct.

[0012] In one embodiment, the upper shell includes a baffle and a first arc plate, the first arc plate is recessed in the baffle, the top side of the first arc plate forms the bottom of the resonance groove, and the bottom side of the first arc plate forms the bottom of the first spiral groove.

[0013] In one embodiment, the first curved plate first gradually bends downward along its length direction, and then gradually bends upward.

[0014] In one of the embodiments, the baffle has an air outlet, and the air outlet is arranged adjacent to the end of the first curved plate, and the air outlet is located on a delay line in the length direction of the first curved plate.

[0015] In one embodiment, the first end of the second spiral groove is open, and the tail end of the second spiral groove is closed and connected to the upper shell.

[0016] In one of the embodiments, the upper shell is integrally formed.

[0017] In one of the embodiments, the lower shell is integrally formed.

[0018] In one of the embodiments, one of the lower periphery of the upper shell and the upper periphery of the lower shell is provided with a groove, and one of the lower periphery of the upper shell and the upper periphery of the lower shell is provided with a protrusion, and the protrusion and the groove are embedded and matched.

[0019] In one embodiment, the upper shell has a first connecting hole, and the lower shell has a second connecting hole, and the number and position of the first connecting hole and the second connecting hole correspond to each other so that fasteners can be inserted into the first connecting hole and the second connecting hole.

[0020] In one embodiment, there are multiple first connection holes, and the multiple first connection holes are distributed at intervals along the extension direction of the resonance slot.

[0021] In one embodiment, there are multiple second connection holes, and the multiple second connection holes are spaced apart and distributed along the extension direction of the resonance slot.

[0022] In one of the embodiments, one of the lower periphery of the upper shell and the upper periphery of the lower shell has a clamping hole, and the other of the lower periphery of the upper shell and the upper periphery of the lower shell has a clamping block, and the clamping block is detachably clamped in the clamping hole.

[0023] In one embodiment, there are multiple clamping holes, and the multiple clamping holes are distributed at intervals along the outer wall of the upper shell.

[0024] In one embodiment, there are multiple blocks, and the multiple blocks are distributed at intervals along the outer wall of the lower shell.

[0025] The beneficial effects of the duct speaker provided by the present invention are as follows: the speaker unit vibrates to emit sound waves, which resonate in the resonance groove and are then emitted, becoming a new sound source and superimposed with the sound waves emitted by the speaker unit, thereby achieving gain or attenuation of a specific frequency band. A physical equalizer is formed through adjustment by physical means, and a reverberation effect is added to the music in a subjective listening sense. Compared with an electronic equalizer, the spectral balance of the sound can be adjusted more naturally without introducing electronic noise and distortion, thereby improving the purity and accuracy of the sound quality, solving the technical problem that the reverberation effect of the existing speakers needs to be improved, making the music sound fuller and more three-dimensional, with a stronger sense of space, thereby improving the immersion and expressiveness of the music. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of the structure of the air duct speaker provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the structure of a duct speaker box provided by an embodiment of the present invention;

[0029] Figure 3 This is the near-field acoustic frequency response test diagram;

[0030] Figure 4 This is the near-field acoustic distortion response test chart;

[0031] Figure 5 A schematic diagram of the structure of the upper shell of the air duct speaker provided by an embodiment of the present invention;

[0032] Figure 6 for Figure 5 Another perspective view of the upper shell in FIG.

[0033] Figure 7 A schematic structural diagram of a lower shell of a duct speaker provided in an embodiment of the present invention;

[0034] Figure 8 for Figure 7 Another perspective view of the lower shell in.

[0035] Among them, the reference numerals in the figure are:

[0036] 100. Box body; 101. Installation cavity; 102. Air inlet; 110. Upper shell; 111. Installation port; 112. Resonance groove; 113. First spiral groove; 114. Air outlet; 115. Baffle; 116. First arc-shaped plate; 117. Groove; 118. First connecting hole; 119. Clamp hole; 120. Lower shell; 121. Second spiral groove; 122. Protrusion; 123. Second connecting hole; 124. Clamp block; 125. Second arc-shaped plate; 126. Bottom plate; 200. Speaker unit. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0039] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Combination Figure 1 and Figure 2 The present application provides a duct speaker. The duct speaker includes a box body 100 and a speaker unit 200. The box body 100 includes an upper shell 110 and a lower shell 120. The upper shell 110 and the lower shell 120 are connected to enclose a mounting cavity 101. The upper shell 110 has a mounting opening 111 and a resonance groove 112 on a side away from the lower shell 120. The mounting opening 111 is connected to the mounting cavity 101, and the resonance groove 112 is extended along the circumference of the mounting opening 111. The speaker unit 200 is installed in the mounting cavity 101 through the mounting opening 111, and the speaker unit 200 seals the mounting opening 111.

[0043] The speaker unit 200 vibrates to emit sound waves, which resonate in the resonance groove 112 and are then emitted, becoming a new sound source and superimposed with the sound waves emitted by the speaker unit 200, thereby achieving gain in a specific frequency band. A physical equalizer is formed through adjustment by physical means, and a reverberation effect is added to the music in a subjective listening sense.

[0044] Figure 3 1 is a near-field acoustic frequency response test diagram, the solid line represents the duct speaker with the resonance slot 112, and the dotted line represents the traditional speaker without the resonance slot 112. Figure 3 It can be seen from the figure that in a specific frequency band (such as Figure 3 As shown in the 3.5kHz-4.5kHz, there is a gain of about 2dB), the sound pressure of the duct speaker with the resonance groove 112 is stronger than the sound pressure of the traditional speaker. The subjective listening experience makes the human voice more ethereal and the scene of the singer's singing more open.

[0045] Figure 4 1 is a near-field acoustic distortion response test diagram, the solid line represents a duct speaker with a resonance slot 112, and the dotted line represents a conventional speaker without a resonance slot 112. Figure 4It can be seen that the distortion of the duct speaker with the resonance slot 112 is consistent with that of the traditional speaker in the range of 100Hz to 10000Hz. In other words, the duct speaker does not distort after the resonance slot 112 is set. Therefore, compared with the electronic equalizer, it can adjust the spectral balance of the sound more naturally without introducing electronic noise and distortion, improve the purity and accuracy of the sound quality, make the music sound fuller, three-dimensional, and have a stronger sense of space, and improve the immersion and expression of the music.

[0046] In some embodiments, in combination Figure 1 and Figure 5 , the groove depth a of the resonance groove 112 is 10mm~25mm. According to the characteristics of sound wave propagation and reflection, it is easy to know that for the resonance groove 112 with an open middle, the resonance groove 112 can be regarded as a sound tube, and the groove depth can be regarded as the diameter of the sound tube. The groove depth is 1 / 4 of the wavelength of the affected frequency band, that is, the wavelength of the affected sound wave is 40mm~100mm, and the corresponding center frequency is 3500Hz~8500Hz, which belongs to the high pitch, can give the sound a sense of brightness, improve the clarity and sharpness of the sound, and can create a sense of space for the sound, so that the audience can feel the three-dimensional sense of the sound. In addition, the groove depth a of the resonance groove 112 is less than half of the wavelength λ, and there is no lateral vibration in the resonance groove 112. It can be regarded as a one-dimensional system, and the sound wave propagates along the length of the resonance groove 112. The groove depth a satisfies f refers to the frequency of the sound wave, that is, the resonance slot 112 has a certain width, which is much larger than the thickness of the viscous layer of air on the slot wall of the resonance slot 112, and the viscosity of the air can be ignored.

[0047] Specifically, the groove depth a of the resonance groove 112 refers to the maximum groove depth of the resonance groove 112. Optionally, the depths of both ends of the resonance groove 112 gradually increase inwards to facilitate the entry of sound waves. The groove depth of the middle part of the resonance groove 112 remains unchanged.

[0048] Optionally, the groove depth a of the resonance groove 112 is 10 mm, 15 mm, 17 mm, 19 mm, 20 mm or 25 mm.

[0049] It is understandable that in other embodiments, the groove depth a of the resonance groove 112 may be selectively adjusted according to a specific frequency band of the desired reverberation.

[0050] In some embodiments, in combination Figure 1, the folding ring of the speaker unit 200 is 1mm to 5mm higher than the plane where the notch of the resonance slot 112 is located. Since the wavelength of mid- and high-frequency sounds is short, sound waves are prone to diffraction, and the influence of the folding ring height on the diffraction of sound waves is required. By adjusting the folding ring height b, the diffraction effect on sound waves in the mid- and high-frequency bands can be minimized, thereby maintaining the clarity and transparency of the sound. In contrast, it is difficult to effectively avoid this diffraction phenomenon by simply deepening the slot depth a. When the folding ring is higher than the resonance slot 112, it vibrates more freely and can better drive the air, thereby enhancing the radiation effect of low-frequency sound waves, making the low-frequency response of the speaker fuller and more powerful.

[0051] In the present application, 1 / 4 of the wavelength of the reverberation frequency band is equal to the fold height b and the groove depth a of the resonance groove 112, thereby satisfying the specific frequency band of the required reverberation. Manufacturers can obtain greater design flexibility by adjusting the fold height b and the groove depth a of the resonance groove 112 at the same time. They can optimize the combination of these two parameters according to the specific needs and target sound characteristics of the speaker to achieve the best sound effect.

[0052] Optionally, the fold height b is 1 mm, 3 mm, 4 mm or 5 mm.

[0053] In some embodiments, the length of the resonance slot 112 is 10 cm to 20 cm. Sound waves propagate from one end of the resonance slot 112 to the other end of the resonance slot 112. The length of the resonance slot 112 affects the phase of the sound waves when they leave the resonance slot 112, and further affects the gain and reverberation of a specific frequency band. Within the length range of 10 cm to 20 cm, the sound waves in the mid- and high-frequency bands are resonated and enhanced. At the same time, the resonance slot 112 can absorb sound waves along the length direction and guide the sound waves to the end of the resonance slot 112, thereby improving the directivity of the sound; at the same time, it can also control the diffusion range of the sound waves to a certain extent, making the sound more uniform and natural.

[0054] Optionally, the length of the resonance tank 112 is 10 cm, 13 cm, 15 cm, 17 cm, 19 cm or 20 cm.

[0055] In one embodiment, the length of the resonant slot 112 is 6 to 15 times the slot depth of the resonant slot 112. The ratio between the length and the slot depth of the resonant slot 112 directly affects the resonant frequency and bandwidth of the resonant slot 112. Within this ratio range, the resonant slot 112 can more effectively resonate in the mid-high frequency band, thereby enhancing the sound performance in this frequency band. At the same time, the appropriate length can also help control the resonant bandwidth to avoid sound quality problems caused by being too wide or too narrow.

[0056] In some embodiments, the shape of the resonant groove 112 is spiral. Compared with a straight or corner type, the spiral resonant groove 112 extends the length of the resonant groove 112 by spiral in a limited plane space without increasing the height or length of the box 100, thereby reducing the size design restrictions of the box 100 and facilitating the miniaturization design of the box 100. The spiral design also helps to improve the distribution of the sound field. The sound waves are reflected and diffracted multiple times in the spiral groove, and can be more evenly distributed in the space, reducing the local enhancement or weakening of the sound field, making the sound sound more natural and balanced. Because the resonant groove 112 has a certain degree of curvature, the sound waves will be guided to a certain extent during the propagation process, thereby improving the directivity of the sound.

[0057] Specifically, the resonant groove 112 is spirally rotated within three quarters of a circle to avoid frequency interference and overlap of resonance peaks that may be caused by rotating too many circles, thereby ensuring that the frequency response curve of the speaker is smoother and more natural.

[0058] In some embodiments, the number of the resonance slots 112 is one, two, or more than two. Optionally, the number of the resonance slots 112 is 1-4.

[0059] In some embodiments, the groove depth and length of two or more resonant grooves 112 may be the same or different, and are not limited to this. For example, all the resonant grooves 112 have the same size (including the same groove depth and length), so that the same amplitude of gain is performed on the same specific frequency band, and the uniform gain of the specific frequency band over 360 degrees is enhanced. For another example, the groove depths of all the resonant grooves 112 are different, so that gain is performed on different frequency bands to achieve a wider frequency response.

[0060] In one embodiment, when there are more than two resonant slots 112, the more than two resonant slots 112 are spaced apart along the speaker unit 200, and the more than two resonant slots 112 are located on the same circumference line with the speaker unit 200 as the center. The multiple resonant slots 112 form multiple resonance points on the same circumference line, making the frequency response of the sound box smoother and making the sound waves propagate more evenly in the space.

[0061] In another embodiment, when the number of the resonance slots 112 is more than two, the more than two resonance slots 112 are arranged in concentric circles with the speaker unit 200 as the center, and the more than two resonance slots 112 have different radii from the speaker unit 200. The resonance slots 112 with different radii can guide the sound waves to be more evenly distributed in space, reducing the local enhancement or weakening of the sound field.

[0062] In some embodiments, the length of the resonance groove 112 is 15 cm to 17 cm, the groove depth a is 1.5 cm to 2.0 cm, and the folded ring height b is 0.1 cm to 0.5 cm. Since 1 / 4 of the wavelength of the affected frequency band is the sum of the groove depth a and the folded ring height b, that is, the wavelength of the affected sound wave is 6 cm to 10 cm, the frequency center point of the resonance groove 112 as a sound source output is approximately 4250 Hz.

[0063] In this embodiment, the outer contours of the upper shell 110 and the lower shell 120 may be circular, elliptical, polygonal or irregular, which is not limited here.

[0064] In some embodiments, in combination Figure 2 , Figure 5 , Figure 6 and Figure 7 The upper shell 110 has a first spiral groove 113, the notch of the first spiral groove 113 faces downward, and the top of the upper shell 110 has an air outlet 114 connected to the end of the first spiral groove 113. The lower shell 120 has a second spiral groove 121, the notch of the second spiral groove 121 faces upward, and the groove wall of the first spiral groove 113 and the groove wall of the second spiral groove 121 enclose a conduit. The first end of the first spiral groove 113 and / or the second spiral groove 121 has an air inlet 102, and the air inlet 102 and the air outlet 114 are respectively located at the two ends of the conduit.

[0065] Since sound waves have weaker directivity at lower frequencies, the sound waves in front and behind the diaphragm of the speaker unit 200 will diffract and cancel each other out, resulting in poor low-frequency effects. The first spiral groove 113 of the upper shell 110 and the second spiral groove 121 of the lower shell 120 are closed to form a duct, the first end of the duct has an air inlet 102, the end of the duct has an air outlet 114, and the duct portion between the two ends is formed by the groove wall of the first spiral groove 113 and the groove wall of the second spiral groove 121 to form a closed tube wall. The longer the length of the duct, the lower the tuning frequency of the duct, which is more conducive to the transmission of low-frequency sound waves, avoiding the cancellation of low-frequency sound waves with weak directivity, thereby improving the sound effect.

[0066] In this embodiment, compared with a straight or corner type, the spiral duct extends the length of the duct through the spiral within a limited plane space without increasing the height or length of the box 100, thereby reducing the size design restrictions of the box 100 and facilitating the miniaturization design of the box 100 and the speaker.

[0067] Taking a 18cm long catheter as an example, if a traditional straight catheter design is adopted, the total length of one side of the box 100 needs to be at least 20cm (a reasonable distance including a 2cm hole should be reserved at the edge). If a curved catheter (or L-shaped) is adopted, the box 100 needs at least two sides to be 10cm long. The diameter of the spiral duct is 9.6 cm, and the length of the third side is almost not required. If the spiral is more than one circle, the required diameter is less than 4.6 cm, further reducing the size limit of the box 100. In addition, the air inlet 102 and the air outlet 114 are far from the edge or not facing the edge, so there is no need to reserve a reasonable distance from the edge. Therefore, the spiral duct can achieve good sound performance in a compact design environment.

[0068] Specifically, the number of turns of the first spiral groove 113 and the second spiral groove 121 is at least 1 / 2, so as to utilize the planes of the upper shell 110 and the lower shell 120 as much as possible to increase the length of the spiral without increasing the outer diameters of the upper shell 110 and the lower shell 120.

[0069] Further, the number of turns of the first spiral groove 113 and the second spiral groove 121 is at least 1. As the number of turns of the spiral increases, the conduit can achieve a longer effective length in a limited space without significantly increasing the overall size of the box 100. This allows the spiral box 100 to be more flexible to adapt to various space constraints, especially in small or compact environments. Optionally, the number of turns of the first spiral groove 113 and the second spiral groove 121 is at least 1.5.

[0070] In addition, while maintaining a lower tuning frequency (usually more conducive to airflow performance), the spiral duct may reduce turbulence and noise to a certain extent due to the spiral motion of the internal airflow, improve the stability and uniformity of the airflow, contribute to the uniform propagation and reflection of sound, reduce sound distortion, and further improve the sound quality performance. In addition, the internal opening is far away from other walls, which reduces the friction between the airflow and the wall surface, further improving efficiency. In addition, the design of the spiral duct allows the position of the air inlet 102 and the air outlet 114 to be flexibly adjusted in different directions, enhancing the adaptability and flexibility of the box 100 and further reducing design restrictions.

[0071] In some embodiments, in combination Figure 5 and Figure 6 The upper shell 110 includes a baffle 115 and a first curved plate 116. The first curved plate 116 is recessed in the baffle 115. The top side of the first curved plate 116 forms the bottom of the resonance groove 112, and the bottom side of the first curved plate 116 forms the bottom of the first spiral groove 113. By recessing the first curved plate 116 in the baffle 115 and forming the resonance groove 112 and the first spiral groove 113 at the same time, the structure of the upper shell 110 is simplified, and the number of structural parts of the upper shell 110 is reduced. The shape and curvature of the first curved plate 116 can optimize the flow of airflow in the resonance groove 112 and the first spiral groove 113, reduce turbulence and noise, and improve sound quality.

[0072] In one embodiment, in combination Figure 5 and Figure 6 , the first curved plate 116 gradually bends downward along its length direction, and then gradually bends upward. The curved design can more effectively guide the propagation path of sound inside the speaker, so that the sound waves are better reflected and diffused during the transmission process, thereby improving the uniformity and three-dimensional sense of the sound. In particular, low-frequency sound waves are more likely to resonate between the curved curved plates, enhancing the low-frequency effect. The curved design of the first curved plate 116 can change the sound field distribution inside the speaker, reduce the generation of standing waves, and make the sound clearer and purer.

[0073] In one embodiment, the baffle 115 has an air outlet 114, and the air outlet 114 is arranged adjacent to the end of the first curved plate 116, and the air outlet 114 is located on the delay line in the length direction of the first curved plate 116. The mid-high frequency sound waves are output along the resonance groove 112 located above the first curved plate 116, and the low frequency sound waves are output along the first spiral groove 113 located below the first curved plate 116. The mid-high frequency sound waves and the low frequency sound waves reverberate in the length direction of the first curved plate 116 without separation, thereby improving the reverberation effect, and resonate with the speaker unit 200 as a new sound source, further improving the frequency gain.

[0074] Specifically, the first arc plate 116 is located at the edge of the installation cavity 101, making full use of the outer circumference of the installation cavity 101 to extend the length of the conduit, thereby facilitating the reduction of the number of turns of the first spiral groove 113 and the size of the upper shell 110 and the box body 100.

[0075] In some embodiments, the first end of the first spiral groove 113 is open to form an air inlet 102. The air inlet 102 is directly disposed at the first end of the first spiral groove 113, so that external air can directly and smoothly enter the air duct, reducing the obstruction of air flow, helping to reduce the noise generated by air flow, and making the acoustic performance of the speaker box purer.

[0076] In one embodiment, the bottom of the first spiral groove 113 at the head end is gradually inclined away from the lower shell 120, thereby expanding the size of the air inlet 102 and further reducing the air inlet resistance, and the gradual inclination is conducive to the smooth entry of sound waves into the first spiral groove 113. Optionally, the head end of the first spiral groove 113 is inclined in an arc surface. In other embodiments, the head end of the first spiral groove 113 is inclined in a plane, which is not limited here.

[0077] In some embodiments, the upper shell 110 is integrally formed. That is, the upper shell 110 is integrally formed to form the first spiral groove 113 and the resonance groove 112, and there is no need to assemble the first spiral groove 113 and the resonance groove 112, that is, there is no need to manufacture additional conduits, which reduces the cost of producing and assembling conduits, simplifies the manufacturing process and assembly operations of the box 100, and reduces the size and cost caused by separate manufacturing and assembly. In addition, the one-piece design reduces the gaps and interfaces between the separately assembled parts, reduces the possibility of sound leakage, and further improves the acoustic performance of the speaker. The one-piece upper shell 110 makes the structure of the box 100 more compact and sturdy, and improves the overall strength and stability.

[0078] In some embodiments, in combination Figure 7 and Figure 8 , the lower shell 120 is integrally formed. That is, the lower shell 120 is integrally formed to form the second spiral groove 121, and there is no need to perform the assembly operation of the second spiral groove 121, that is, there is no need to additionally manufacture the duct, which reduces the cost for producing and assembling the duct, simplifies the manufacturing process and assembly operation of the box 100, and reduces the size and cost caused by separate manufacturing and assembly. In addition, the one-piece design reduces the gaps and interfaces between the separately assembled parts, reduces the possibility of sound leakage, and further improves the acoustic performance of the speaker. The one-piece lower shell 120 makes the structure of the box 100 more compact and sturdy, and improves the overall strength and stability.

[0079] In some embodiments, in combination Figure 7 and Figure 8 The first end of the second spiral groove 121 is open and has an air inlet 102, and the end of the second spiral groove 121 is closed and connected to the upper shell 110. The shape of the second spiral groove 121 can guide the sound waves to propagate along a certain path inside the conduit, reduce the scattering and reflection of the sound waves, and the sound waves in the second spiral groove 121 and the sound waves in the first spiral groove 113 enter the air outlet 114 of the upper shell 110 at the end thereof, thereby improving the directionality of the sound waves and avoiding the loss of the sound waves.

[0080] In some embodiments, in combination Figure 7 and Figure 8The lower shell 120 includes a bottom plate 126 and a second curved plate 125, the bottom plate 126 and the second curved plate 125 are spaced apart in the height direction, the second curved plate 125 is located above the bottom plate 126, and the projections of the bottom plate 126 and the second curved plate 125 in the height direction are combined into a circle. In other words, the bottom plate 126 has an arc-shaped notch, the second curved plate 125 is located above the arc-shaped notch, and the bottom plate 126 and the second curved plate 125 are connected by a baffle. The second curved plate 125 and the protruding baffles located on both sides of the second curved plate 125 surround the second spiral groove 121. The second spiral groove 121 uses the second curved plate 125 to occupy the outer space of the bottom plate 126, and fully utilizes the outer circumference of the bottom plate 126 to extend the length of the conduit, thereby reducing the number of turns of the second spiral groove 121 and reducing the size of the lower shell 120.

[0081] In some embodiments, the first end of the second spiral groove 121 is open to form an air inlet 102. The air inlet 102 is directly disposed at the first end of the second spiral groove 121, so that external air can directly and smoothly enter the air duct, reducing the obstruction of air flow, helping to reduce the noise generated by air flow, and making the acoustic performance of the speaker box purer.

[0082] In one embodiment, the width of the head end of the second spiral groove 121 gradually increases toward the end away from the second spiral groove 121 , thereby expanding the size of the air inlet 102 and further reducing the air inlet resistance, while the gradual inclination facilitates the sound waves to smoothly enter the second spiral groove 121 .

[0083] In some embodiments, the end of the second spiral groove 121 gradually tilts toward the upper shell 110, which helps guide the sound waves into the end of the first spiral groove 113 of the upper shell 110 and then out of the duct through the air outlet 114, thereby enhancing the low-frequency sound waves.

[0084] In some embodiments, in combination Figures 5 to 8 A groove 117 is provided on the lower periphery of the upper shell 110 and the upper periphery of the lower shell 120, and a protrusion 122 is provided on the lower periphery of the upper shell 110 and the upper periphery of the lower shell 120. The protrusion 122 and the groove 117 are embedded and matched to improve the accurate and rapid positioning of the first spiral groove 113 and the second spiral groove 121. The spiral catheter design has many advantages such as improving the connection stability, simplifying the assembly process, improving the sealing performance, extending the service life, and facilitating maintenance and replacement.

[0085] Optionally, a groove 117 is provided at the notch of the first spiral groove 113 , and a protrusion 122 is provided at the notch of the second spiral groove 121 .

[0086] Optionally, both sides of the first spiral groove 113 in the width direction have grooves 117 or protrusions 122, and both sides of the second spiral groove 121 in the width direction are correspondingly provided with protrusions 122 or grooves 117, so as to improve the positioning strength.

[0087] In some embodiments, in combination Figures 5 to 8 The upper shell 110 has a first connecting hole 118 , and the lower shell 120 has a second connecting hole 123 . The number and position of the first connecting holes 118 and the second connecting holes 123 correspond to each other, so that fasteners can be inserted into the first connecting holes 118 and the second connecting holes 123 .

[0088] In one embodiment, there are multiple first connection holes 118 , and the multiple first connection holes 118 are spaced apart along the extension direction of the resonance slot 112 , so that the resonance slot 112 is firmly connected everywhere in the extension direction.

[0089] Specifically, the upper shell 110 has a first connection column, and the first connection column is provided with a first connection hole 118. The design of the first connection column is conducive to increasing the length of the first connection hole 118, thereby improving the connection length and connection strength between the upper shell 110 and the lower shell 120.

[0090] In one embodiment, there are multiple second connection holes 123 , which are spaced apart along the extension direction of the resonance groove 112 , so that the conduit is firmly connected everywhere in the extension direction, preventing the first spiral groove 113 and the second spiral groove 121 from separating.

[0091] Specifically, the lower shell 120 has a second connection column, and the second connection column is provided with a second connection hole 123. The design of the second connection column is conducive to increasing the length of the second connection hole 123, thereby improving the connection length and connection strength between the upper shell 110 and the lower shell 120.

[0092] In one embodiment, some of the first connection holes 118 and the second connection holes 123 are spaced apart along the inner side of the catheter to improve the connection reliability inside the catheter.

[0093] In one of the embodiments, one of the lower periphery of the upper shell 110 and the upper periphery of the lower shell 120 has a card hole 119, and the other of the lower periphery of the upper shell 110 and the upper periphery of the lower shell 120 has a card block 124. The card block 124 can be detachably engaged in the card hole 119, which facilitates the quick connection of the upper shell 110 and the lower shell 120, and the connection is firm and not easy to loosen.

[0094] Optionally, the upper shell 110 has a locking hole 119 , and the lower shell 120 has a locking block 124 .

[0095] In one embodiment, there are multiple clamping holes 119 , and the multiple clamping holes 119 are distributed at intervals along the outer wall of the upper shell 110 to ensure the connection stability of the outer side of the upper shell 110 .

[0096] In one embodiment, there are multiple blocks 124 , and the multiple blocks 124 are distributed along the outer wall of the lower shell 120 at intervals to ensure the connection stability of the outer side of the lower shell 120 .

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A duct speaker, characterized in that: The air duct speaker comprises: The box body comprises an upper shell and a lower shell, wherein the upper shell and the lower shell are connected to enclose a mounting cavity, wherein a side of the upper shell away from the lower shell has a mounting opening and a resonance groove, wherein the mounting opening is communicated with the mounting cavity, and the resonance groove is extended along the circumference of the mounting opening; The speaker unit is installed in the installation cavity through the installation opening, and the speaker unit seals the installation opening.

2. The air duct speaker according to claim 1, characterized in that: The depth of the resonance groove is 10 mm to 25 mm.

3. The air duct speaker according to claim 1, characterized in that: The folding ring of the speaker unit is 1 mm to 5 mm higher than the plane where the notch of the resonance slot is located.

4. The air duct speaker according to claim 1, characterized in that: The length of the resonance tank is 10 cm to 20 cm.

5. The air duct speaker according to claim 1, characterized in that: The length of the resonance groove is 6 to 15 times the groove depth of the resonance groove.

6. The air duct speaker according to claim 1, characterized in that: The upper shell has a first spiral groove, the groove opening of the first spiral groove faces downward, and the top of the upper shell has an air outlet connected to the end of the first spiral groove; the lower shell has a second spiral groove, the groove opening of the second spiral groove faces upward, and the groove wall of the first spiral groove and the groove wall of the second spiral groove enclose a conduit; the first end of the first spiral groove and / or the second spiral groove has an air inlet, and the air inlet and the air outlet are respectively located at the two ends of the conduit.

7. The air duct speaker according to claim 6, characterized in that: The upper shell includes a baffle and a first arc plate, the first arc plate is recessed in the baffle, the top side of the first arc plate forms the bottom of the resonance groove, and the bottom side of the first arc plate forms the bottom of the first spiral groove.

8. The air duct speaker according to claim 7, characterized in that: The first curved plate gradually bends downward along its length direction, and then gradually bends upward; The baffle has an air outlet, and the air outlet is arranged adjacent to the end of the first arc-shaped plate, and the air outlet is located on a delay line in the length direction of the first arc-shaped plate.

9. The air duct speaker according to claim 6, characterized in that: The head end of the second spiral groove is open, and the tail end of the second spiral groove is closed and connected to the upper shell.

10. The air duct speaker according to any one of claims 1 to 9, characterized in that: The upper shell is integrally formed, and the lower shell is integrally formed; A groove is provided on one of the lower periphery of the upper shell and the upper periphery of the lower shell, and a protrusion is provided on one of the lower periphery of the upper shell and the upper periphery of the lower shell, and the protrusion and the groove are embedded and matched; The upper shell has a first connection hole, and the lower shell has a second connection hole, and the number and position of the first connection hole and the second connection hole correspond to each other, so that fasteners can be inserted into the first connection hole and the second connection hole; There are a plurality of first connection holes, and the plurality of first connection holes are distributed at intervals along the extension direction of the resonance slot; There are a plurality of second connection holes, and the plurality of second connection holes are distributed at intervals along the extension direction of the resonance slot; One of the lower periphery of the upper shell and the upper periphery of the lower shell has a clamping hole, and the other of the lower periphery of the upper shell and the upper periphery of the lower shell has a clamping block, and the clamping block is detachably clamped in the clamping hole; There are multiple clamping holes, and the multiple clamping holes are distributed along the outer wall of the upper shell at intervals; There are multiple card blocks, and the multiple card blocks are distributed along the outer wall of the lower shell at intervals.

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