Air duct box and sound box

Abstract

The utility model relates to the technical field of sound boxes, and provides an air duct box and a sound box. The air pipe box comprises an upper shell and a lower shell, the upper shell is provided with a first spiral groove, an opening of the first spiral groove faces downwards, and the top of the upper shell is provided with an air outlet communicating with the tail end of the first spiral groove; the lower shell is provided with a second spiral groove, a groove opening of the second spiral groove faces upwards, the lower shell is connected with the upper shell, the groove wall of the first spiral groove and the groove wall of the second spiral groove define a guide pipe, the head end of the first spiral groove and / or the head end of the second spiral groove are / is provided with an air inlet, and the air inlet and the air outlet are located at the two ends of the guide pipe respectively. Wherein the guide pipe is spiral, the length of the guide pipe is extended in a limited plane space, the height or length of the air duct box does not need to be increased, the technical problem that the size of an existing sound box is too large is solved, and miniaturization design of the air duct box and the sound box is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of sound boxes, in particular to an air duct box and a sound box. Background Art

[0002] The speaker in a speaker reproduces sound through the reciprocating motion of the entire vibrating system (including the diaphragm) driven by the Ampere force of the coil. Because sound waves have weaker directivity at lower frequencies, the diffraction of sound waves in front of and behind the diaphragm cancels each other out, resulting in poor low-frequency sound. Consequently, closed speakers with a box behind the speaker, which in turn contains a duct box that connects to external piping, have gradually developed. However, existing duct boxes suffer from the technical problem of being too large. Utility Model Content

[0003] The purpose of the utility model is to provide a duct box and a speaker, aiming to solve the technical problem that the existing speaker is too large in size.

[0004] In a first aspect, the present application provides an air duct box, the air duct box comprising:

[0005] an upper shell, the upper shell having a first spiral groove, the notch of the first spiral groove facing downward, and a top of the upper shell having an air outlet connected to a terminal end of the first spiral groove;

[0006] The lower shell has a second spiral groove, the groove opening of the second spiral groove faces upward, the lower shell is connected to the upper shell, 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.

[0007] In one embodiment, the upper shell is integrally formed.

[0008] In one embodiment, the lower shell is integrally formed.

[0009] In one embodiment, the upper shell includes a top plate, a first annular plate and a first convex plate, the first annular plate and the first convex plate are connected to the bottom of the top plate, the first convex plate is located on the inner side of the first annular plate, and the first spiral groove is formed between the first convex plate and the first annular plate.

[0010] In one embodiment, the lower shell includes a bottom plate, a second annular plate and a second convex plate, the second annular plate and the second convex plate are connected to the top of the bottom plate, the second convex plate is located on the inner side of the second annular plate, and the second spiral groove is formed between the second convex plate and the second annular plate.

[0011] In one embodiment, the first end of the first spiral groove is open to form the air inlet.

[0012] In one embodiment, the bottom of the first spiral groove at the head end gradually slopes away from the lower shell.

[0013] In one embodiment, the first end of the second spiral groove is open to form the air inlet.

[0014] In one embodiment, the width of the first end of the second spiral groove gradually increases toward the end away from the second spiral groove.

[0015] In one embodiment, the end of the second spiral groove gradually inclines toward the upper shell.

[0016] In one embodiment, a groove is provided at one of the notch of the first spiral groove and the notch of the second spiral groove, and a protrusion is provided at one of the notch of the first spiral groove and the notch of the second spiral groove, and the protrusion and the groove are embedded and matched.

[0017] In one embodiment, the upper shell has a first connecting hole, and the lower shell has a second connecting hole. The number and position of the first connecting hole and the second connecting hole correspond to each other, so that fasteners can be passed through the first connecting hole and the second connecting hole.

[0018] In one embodiment, there are multiple first connection holes, and the multiple first connection holes are spaced apart along the extending direction of the first spiral groove.

[0019] In one embodiment, there are multiple second connection holes, and the multiple second connection holes are spaced apart along the extending direction of the second spiral groove.

[0020] In one embodiment, one of the periphery of the upper shell and the periphery of the lower shell has a latch hole, and the other of the periphery of the upper shell and the periphery of the lower shell has a latch block, and the latch block is detachably latched in the latch hole.

[0021] 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.

[0022] In one embodiment, there are multiple blocks, and the multiple blocks are distributed at intervals along the outer wall of the lower shell.

[0023] In a second aspect, the present application provides a speaker, which includes the duct box described in any one of the above.

[0024] The beneficial effects of the duct box and speaker provided by the utility model are as follows: the longer the length of the duct, the lower the tuning frequency of the duct, the more conducive to the transmission of low-frequency sound waves, avoiding the cancellation of low-frequency sound waves with weak directivity, and thus improving the sound effect; the traditional duct box adopts a straight or corner duct. When the length of the duct is increased, the size of the duct in a certain direction is larger, resulting in the overall size of the duct box being too large. In the duct box provided in the present application, the first spiral groove of the upper shell and the second spiral groove of the lower shell are combined to form a duct, the head end of the duct has an air inlet, and the end of the duct has an air outlet. The duct part between the two ends is formed by the groove wall of the first spiral groove and the groove wall of the second spiral groove to form a closed duct wall. Compared with the straight or corner type, the duct is spiral, which extends the length of the duct within a limited plane space without increasing the height or length of the duct box, solving the technical problem of the existing speaker being too large in size, and is conducive to the miniaturized design of the duct box and the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 any creative labor.

[0026] Figure 1 A schematic structural diagram of the air duct box provided in an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 Another perspective view of the duct box;

[0028] Figure 3 for Figure 1 A schematic structural diagram of the upper shell of the air duct box;

[0029] Figure 4 for Figure 3 Another perspective of the upper shell;

[0030] Figure 5 for Figure 1 A schematic structural diagram of the lower shell of the air duct box;

[0031] Figure 6 for Figure 5 Another perspective view of the lower shell.

[0032] Among them, the reference numerals in the figures are:

[0033] 100, upper shell; 110, first spiral groove; 120, air outlet; 130, top plate; 140, first annular plate; 150, first convex plate; 160, groove; 170, first connecting column; 171, first connecting hole; 180, latch hole;

[0034] 200, lower shell; 210, second spiral groove; 220, bottom plate; 230, second annular plate; 240, second convex plate; 250, protrusion; 260, second connecting column; 261, second connecting hole; 270, clamping block;

[0035] 300. Duct; 310. Air inlet. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present invention, 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 explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference throughout this 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 this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0038] 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 accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0040] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] Example 1

[0042] Combine Figure 1 and Figure 2 The present application provides a duct box. The duct box includes an upper shell 100 and a lower shell 200. The upper shell 100 has a first spiral groove 110, the notch of the first spiral groove 110 faces downward, and the top of the upper shell 100 has an air outlet 120 connected to the end of the first spiral groove 110. The lower shell 200 has a second spiral groove 210, the notch of the second spiral groove 210 faces upward, the lower shell 200 is connected to the upper shell 100, the groove wall of the first spiral groove 110 and the groove wall of the second spiral groove 210 enclose a duct 300, the head end of the first spiral groove 110 and / or the second spiral groove 210 has an air inlet 310, and the air inlet 310 and the air outlet 120 are respectively located at the two ends of the duct 300.

[0043] The longer the duct 300 is, the lower its tuning frequency is, which facilitates the transmission of low-frequency sound waves and prevents the cancellation of weakly directional low-frequency sound waves, thereby improving sound quality. Traditional duct boxes use straight or angled ducts. When the duct length is increased, the duct size in a certain direction becomes larger, resulting in an overall larger duct box size.

[0044] In the duct box provided herein, the first spiral groove 110 of the upper shell 100 and the second spiral groove 210 of the lower shell 200 are combined to form a duct 300. The duct 300 has an air inlet 310 at its head end and an air outlet 120 at its tail end. The portion of the duct 300 between the two ends is enclosed by the groove walls of the first spiral groove 110 and the groove walls of the second spiral groove 210. Compared to a straight or corner-shaped duct, the spiral shape of the duct 300 extends the length of the duct 300 within a limited planar space without increasing the height or length of the duct box. This reduces the size design constraints of the duct box and facilitates the miniaturization of the duct box and speaker.

[0045] Taking a duct 300 with a length of 16cm as an example, if a traditional straight duct 300 design is adopted, the full length of one side of the duct box needs to be at least 18cm (a reasonable distance of 2cm should be reserved for the edge of the duct). If a curved duct 300 (or L-shaped) is adopted, the duct box needs to have at least two sides with a length of 9cm or more. If a spiral duct 300 is used to rotate one circle, it only needs With a diameter of 1.5 cm, a half-turn only requires a diameter of approximately 9 cm, and the length of the third side is almost negligible. If the spiral is completed with more than one turn, the required diameter is less than 4.5 cm, further reducing the size constraints of the duct box. Furthermore, the air inlet 310 and air outlet 120 within the spiral duct 300 are already located relatively far from or not directly facing the edge, eliminating the need for a suitable distance between the outlet and the edge. Therefore, the spiral duct 300 can achieve excellent acoustic performance within a compact design.

[0046] Specifically, the number of turns of the first spiral groove 110 and the second spiral groove 210 is at least 1 / 2, so as to utilize the planes of the upper shell 100 and the lower shell 200 as much as possible to increase the spiral length without increasing the outer diameters of the upper shell 100 and the lower shell 200.

[0047] Furthermore, the number of turns of the first spiral groove 110 and the second spiral groove 210 is at least 1. As the number of turns increases, the duct 300 can achieve a longer effective length within a limited space without significantly increasing the overall size of the duct box. This allows the spiral duct box to more flexibly adapt to various space constraints, especially in small or compact environments. Optionally, the number of turns of the first spiral groove 110 and the second spiral groove 210 is at least 1.5.

[0048] In this embodiment, the outer contours of the upper shell 100 and the lower shell 200 may be circular, elliptical, polygonal or irregular, which is not limited here.

[0049] In addition, while maintaining a lower tuning frequency (generally more conducive to airflow performance), the spiral duct 300 can 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, its 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 300 allows for flexible adjustment of the position of the air inlet 310 and the air outlet 120 in different directions, enhancing the adaptability and flexibility of the air duct box and further reducing design constraints.

[0050] In some embodiments, combined Figure 3 and Figure 4, the upper shell 100 is integrally formed. That is, the upper shell 100 is integrally formed to form the first spiral groove 110, and there is no need to perform the assembly operation of the first spiral groove 110, that is, there is no need to additionally manufacture the duct 300, which reduces the cost for producing and assembling the duct 300, simplifies the manufacturing process and assembly operation of the duct box, 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 100 makes the structure of the duct box more compact and sturdy, and improves the overall strength and stability.

[0051] In some embodiments, combined Figure 3 and Figure 4 The upper shell 100 includes a top plate 130, a first annular plate 140, and a first protruding plate 150. The first annular plate 140 and the first protruding plate 150 are connected to the bottom of the top plate 130. The first protruding plate 150 is located on the inner side of the first annular plate 140. A first spiral groove 110 is formed between the first protruding plate 150 and the first annular plate 140. The first spiral groove 110 takes up the outer space of the upper shell 100 by the first annular plate 140 of the upper shell 100, fully utilizing the outer circumference of the upper shell 100 to extend the length of the duct 300, thereby reducing the number of turns of the first spiral groove 110 and the size of the upper shell 100 and the duct box.

[0052] In addition, the upper shell 100 is composed of a plate-shaped top plate 130, a first annular plate 140, and a first convex plate 150, which is conducive to lightweight and miniaturized design, and is also conducive to one-piece molding.

[0053] Optionally, the top plate 130, the first annular plate 140 and the first convex plate 150 are integrally formed, which helps to reduce gaps and interfaces between components, improve the overall structural compactness, reduce the number of assembly steps and parts, and reduce manufacturing costs.

[0054] In some embodiments, combined Figure 5 and Figure 6 , the lower shell 200 is integrally formed. That is, the lower shell 200 is integrally formed to form the second spiral groove 210, and there is no need to perform the assembly operation of the second spiral groove 210, that is, there is no need to additionally manufacture the duct 300, which reduces the cost for producing and assembling the duct 300, simplifies the manufacturing process and assembly operation of the duct box, 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 200 makes the structure of the duct box more compact and sturdy, and improves the overall strength and stability.

[0055] In some embodiments, combined Figure 5 and Figure 6 The lower housing 200 includes a bottom plate 220, a second annular plate 230, and a second protruding plate 240. The second annular plate 230 and the second protruding plate 240 are connected to the top of the bottom plate 220. The second protruding plate 240 is located on the inner side of the second annular plate 230. A second spiral groove 210 is formed between the second protruding plate 240 and the second annular plate 230. The second spiral groove 210 takes up the outer space of the lower housing 200 by the second annular plate 230 of the upper housing 100, fully utilizing the outer circumference of the lower housing 200 to extend the length of the duct 300. This helps reduce the number of turns of the second spiral groove 210 and the size of the lower housing 200 and the duct box.

[0056] In addition, the lower shell 200 is composed of a plate-shaped bottom plate 220, a second annular plate 230 and a second protruding plate 240, which is conducive to lightweight and miniaturized design, and is also conducive to one-piece molding.

[0057] Optionally, the bottom plate 220, the second annular plate 230 and the second convex plate 240 are integrally formed, which helps to reduce gaps and interfaces between components, improve the overall structural compactness, reduce the number of assembly steps and parts, and reduce manufacturing costs.

[0058] In some embodiments, combined Figure 3 and Figure 4 The first end of the first spiral groove 110 is open to form an air inlet 310. The air inlet 310 is directly provided at the first end of the first spiral groove 110, allowing external air to directly and smoothly enter the air duct, reducing air flow obstruction, helping to reduce noise generated by air flow, and making the acoustic performance of the speaker more pure.

[0059] In one embodiment, the bottom of the first spiral groove 110 at its head end gradually slopes away from the lower housing 200, thereby expanding the size of the air inlet 310 and further reducing air inlet resistance. The gradual slope facilitates the smooth passage of sound waves into the first spiral groove 110. Optionally, the head end of the first spiral groove 110 is configured to be inclined in an arcuate manner. In other embodiments, the head end of the first spiral groove 110 is configured to be inclined in a flat manner, which is not limited here.

[0060] In some embodiments, combined Figure 5 and Figure 6 The first end of the second spiral groove 210 is open to form an air inlet 310. The air inlet 310 is directly provided at the first end of the second spiral groove 210, allowing external air to directly and smoothly enter the air duct, reducing air flow obstruction, helping to reduce noise generated by air flow, and making the acoustic performance of the speaker more pure.

[0061] In one embodiment, the width of the head end of the second spiral groove 210 gradually increases toward the end away from the second spiral groove 210 , thereby expanding the size of the air inlet 310 and further reducing the air inlet resistance, while the gradual inclination facilitates the smooth entry of sound waves into the second spiral groove 210 .

[0062] In some embodiments, combined Figure 5 and Figure 6 The end of the second spiral groove 210 gradually tilts toward the upper shell 100, which is conducive to guiding the sound waves to the end of the first spiral groove 110 of the upper shell 100, and then out of the duct 300 through the air outlet 120, thereby enhancing the low-frequency sound waves.

[0063] In some embodiments, combined Figure 4 and Figure 5 A groove 160 is provided at the notch of the first spiral groove 110 and the notch of the second spiral groove 210, and a protrusion 250 is provided at the notch of the first spiral groove 110 and the notch of the second spiral groove 210. The protrusion 250 and the groove 160 are embedded and matched with each other to improve the accurate and rapid positioning of the first spiral groove 110 and the second spiral groove 210. The spiral catheter 300 design has many advantages such as improving connection stability, simplifying the assembly process, improving sealing performance, extending service life, and facilitating maintenance and replacement.

[0064] Optionally, a groove 160 is provided at the notch of the first spiral groove 110 , and a protrusion 250 is provided at the notch of the second spiral groove 210 .

[0065] Optionally, both sides of the first spiral groove 110 in the width direction have grooves 160 or protrusions 250 , and both sides of the second spiral groove 210 in the width direction are correspondingly provided with protrusions 250 or grooves 160 to improve positioning strength.

[0066] In some embodiments, combined Figure 4 and Figure 5 The upper shell 100 has a first connecting hole 171, and the lower shell 200 has a second connecting hole 261. The number and position of the first connecting hole 171 and the second connecting hole 261 correspond to each other, so that fasteners can be passed through the first connecting hole 171 and the second connecting hole 261 to achieve a fastened connection between the upper shell 100 and the lower shell 200.

[0067] In one embodiment, there are multiple first connection holes 171, and the multiple first connection holes 171 are spaced apart along the extension direction of the first spiral groove 110, so that the catheter 300 is firmly connected everywhere in the extension direction, preventing the first spiral groove 110 and the second spiral groove 210 from separating.

[0068] Specifically, the upper shell 100 has a first connecting post 170, which is provided with a first connecting hole 171. The design of the first connecting post 170 is conducive to increasing the length of the first connecting hole 171, thereby improving the connection length and connection strength between the upper shell 100 and the lower shell 200.

[0069] In one embodiment, there are multiple second connection holes 261, and the multiple second connection holes 261 are spaced apart along the extension direction of the second spiral groove 210, so that the catheter 300 is firmly connected everywhere in the extension direction, preventing the first spiral groove 110 and the second spiral groove 210 from separating.

[0070] Specifically, the lower shell 200 has a second connecting post 260, which is provided with a second connecting hole 261. The design of the second connecting post 260 is conducive to increasing the length of the second connecting hole 261, thereby improving the connection length and connection strength between the upper shell 100 and the lower shell 200.

[0071] In one embodiment, some of the first connection holes 171 and the second connection holes 261 are spaced apart along the inner side of the conduit 300 , thereby improving the connection reliability inside the conduit 300 .

[0072] In some embodiments, combined Figure 4 and Figure 5 One of the periphery of the upper shell 100 and the periphery of the lower shell 200 has a card hole 180, and the other of the periphery of the upper shell 100 and the periphery of the lower shell 200 has a card block 270. The card block 270 can be detachably engaged in the card hole 180, which is conducive to the quick connection of the upper shell 100 and the lower shell 200, and the connection is firm and not easy to loosen.

[0073] Optionally, the upper shell 100 has a locking hole 180 , and the lower shell 200 has a locking block 270 .

[0074] In one embodiment, there are multiple latch holes 180 , which are spaced apart along the outer wall of the upper shell 100 to ensure the connection stability of the outer side of the upper shell 100 .

[0075] In one embodiment, there are multiple clamping blocks 270 , which are spaced apart and distributed along the outer wall of the lower shell 200 to ensure the connection stability of the outer side of the lower shell 200 .

[0076] Example 2

[0077] The present application provides a speaker, which includes any one of the above-mentioned duct boxes, and correspondingly has the corresponding technical effects in Example 1, which will not be described one by one here.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A duct box, characterized in that: The air duct box comprises: an upper shell, the upper shell having a first spiral groove, the notch of the first spiral groove facing downward, and a top of the upper shell having an air outlet connected to a terminal end of the first spiral groove; The lower shell has a second spiral groove, the groove opening of the second spiral groove faces upward, the lower shell is connected to the upper shell, 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.

2. The air duct box according to claim 1, characterized in that: The upper shell is integrally formed, and / or the lower shell is integrally formed.

3. The air duct box according to claim 1, characterized in that: The upper shell includes a top plate, a first annular plate and a first convex plate, the first annular plate and the first convex plate are connected to the bottom of the top plate, the first convex plate is located on the inner side of the first annular plate, and the first spiral groove is formed between the first convex plate and the first annular plate.

4. The air duct box according to claim 1, characterized in that: The lower shell includes a bottom plate, a second annular plate and a second convex plate, the second annular plate and the second convex plate are connected to the top of the bottom plate, the second convex plate is located on the inner side of the second annular plate, and the second spiral groove is formed between the second convex plate and the second annular plate.

5. The air duct box according to claim 1, characterized in that: The first end of the first spiral groove is open to form the air inlet; the bottom of the first end of the first spiral groove is gradually inclined away from the lower shell.

6. The air duct box according to claim 1, characterized in that: The first end of the second spiral groove is open to form the air inlet; the width of the first end of the second spiral groove gradually increases towards the end away from the second spiral groove; the end of the second spiral groove gradually tilts towards the upper shell.

7. The air duct box according to claim 1, characterized in that: A groove is provided at one of the notch of the first spiral groove and the notch of the second spiral groove, and a protrusion is provided at one of the notch of the first spiral groove and the notch of the second spiral groove, and the protrusion is embedded and matched with the groove.

8. The air duct box according to claim 1, characterized in that: The upper shell has a first connecting hole, and the lower shell has a second connecting hole. The number and position of the first connecting holes correspond to the second connecting holes, so that fasteners can be inserted into the first connecting holes and the second connecting holes. There are multiple first connection holes, and the multiple first connection holes are spaced apart along the extending direction of the first spiral groove; There are multiple second connection holes, and the multiple second connection holes are distributed at intervals along the extending direction of the second spiral groove.

9. The air duct box according to any one of claims 1 to 8, characterized in that: One of the periphery of the upper shell and the periphery of the lower shell has a clamping hole, and the other of the periphery of the upper shell and the 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 at intervals along the outer wall of the upper shell; There are multiple card blocks, and the multiple card blocks are distributed at intervals along the outer wall of the lower shell.

10. A speaker, characterized in that: The speaker box comprises the duct box according to any one of claims 1 to 9.

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