A microphone diaphragm

Abstract

The utility model belongs to microphone technical field discloses a microphone microphone core, microphone microphone core includes the chamber shell and the elastic cover, the chamber shell has the sound cavity, and the outer periphery of chamber shell is equipped with the clamping groove, the elastic cover is equipped with the clamping portion in the chamber shell outward, and the clamping portion is clamped in the clamping groove, and the inner wall of elastic cover and the outer periphery of chamber shell form the sound attenuation passage. The utility model provides microphone microphone core, and the inner wall of elastic cover and the outer periphery of chamber shell form the sound attenuation passage, be favorable to the sound wave of attenuation outside transmission into the sound cavity, realize the effect of noise reduction, and be favorable to weakening the oscillation of chamber shell because of external force.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, and in particular to a microphone core. Background Technology

[0002] The microphone core is an indispensable and important component in a microphone, serving as an energy conversion device that transforms sound signals into electrical signals. The microphone core is the input, and the speaker is the output; the two are the two terminals of the sound device.

[0003] Microphones are used in many situations, such as karaoke, small performances, and home entertainment. However, ambient noise can interfere with the audio signal through the microphone, affecting sound quality. Furthermore, frequent use and movement of the microphone can cause impacts and vibrations to the microphone core, impacting its performance and lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a microphone core that is beneficial for noise reduction and vibration damping.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A microphone core is provided, comprising:

[0007] A sound chamber shell, the sound chamber shell having a sound cavity, and a slot provided on the outer periphery of the sound chamber shell;

[0008] An elastic sleeve is fitted over the outer shell of the sound chamber. The elastic sleeve has a snap-fit ​​part inside, which snaps into the slot. A sound-absorbing channel is formed between the inner wall of the elastic sleeve and the outer periphery of the sound chamber shell.

[0009] Optionally, the sound chamber shell is provided with at least two annular grooves spaced apart along the height direction, and the snap-fit ​​part is provided in a one-to-one correspondence with the annular groove, and the snap-fit ​​part snaps into the corresponding annular groove.

[0010] Optionally, the slot includes a first annular groove and a second annular groove spaced apart along the height direction of the sound chamber shell, with the first annular groove located above the second annular groove;

[0011] The snap-fit ​​portion includes a boss assembly and a snap-fit ​​ring portion. The boss assembly includes at least two fan-ring portions spaced apart circumferentially along the elastic sleeve. The fan-ring portions snap into the first annular groove, and the snap-fit ​​ring portions snap into the second annular groove.

[0012] Optionally, a plurality of first connecting portions are provided between the fan ring portion and the inner wall of the elastic sleeve, and a first sound-absorbing hole is formed between the fan ring portion, the two first connecting portions corresponding to and adjacent to the fan ring portion, and the inner wall of the elastic sleeve.

[0013] A plurality of second connecting parts are provided between the retaining ring and the inner wall of the elastic sleeve, and a second sound-absorbing hole is formed between the retaining ring, two adjacent second connecting parts, and the inner wall of the elastic sleeve.

[0014] Optionally, along the height direction of the sound chamber shell, the height of the first connecting portion is less than the height of the fan ring portion, and the height of the second connecting portion is less than the height of the retaining ring portion.

[0015] Optionally, along the height direction of the sound chamber shell, the top of the fan ring portion protrudes from the first connecting portion, and the bottom of the retaining ring portion protrudes from the second connecting portion.

[0016] Optionally, the microphone core further includes a main shell, the top of the main shell is provided with an upper chamber, the bottom of the main shell is provided with a lower chamber communicating with the upper chamber, the periphery of the main shell is provided with a sound transmission hole communicating with the upper chamber, the bottom of the main shell is inserted into the top of the sound chamber shell, and the sound chamber is connected to the lower chamber.

[0017] Optionally, the main shell has a plurality of protrusions spaced circumferentially in the upper cavity, and a sound-permeable groove is formed between two adjacent protrusions;

[0018] The periphery of the main shell is provided with a group of sound-permeable holes, and the group of sound-permeable holes is provided in a one-to-one correspondence with the sound-permeable groove. The group of sound-permeable holes includes at least one sound-permeable hole, and the sound-permeable hole is connected to the corresponding sound-permeable groove.

[0019] Optionally, a baffle is connected between adjacent protrusions; the sound-permeable hole group includes a first sound-permeable hole and a second sound-permeable hole, the first sound-permeable hole is located above the second sound-permeable hole, and at least a portion of the hole wall of the first sound-permeable hole is set below the top surface of the baffle.

[0020] Optionally, the main shell is provided with a partition, which separates the upper chamber and the lower chamber. The partition is provided with a first through hole connecting the upper chamber and the lower chamber, and at least part of the sound-permeable hole is set below the partition.

[0021] The beneficial effects of this utility model are as follows: The microphone core provided by this utility model has an elastic sleeve fitted outside the sound chamber shell, with a snap-fit ​​part snapping into a slot, facilitating the assembly between the sound chamber shell and the elastic sleeve. Furthermore, the snap-fit ​​part prevents the inner wall of the elastic sleeve from contacting the outer peripheral wall of the sound chamber shell, thus forming a noise-absorbing channel between them. This noise-absorbing channel helps attenuate sound waves transmitted into the sound chamber from the outside, achieving a noise reduction effect. In addition, the fact that the inner wall of the elastic sleeve does not contact the outer peripheral wall of the sound chamber shell improves the deformation capability of the elastic sleeve, thereby reducing the vibration of the sound chamber shell caused by external forces. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the microphone core provided by this utility model;

[0023] Figure 2 This is a cross-sectional view of the microphone core provided by this utility model at the sound chamber shell and the elastic sleeve.

[0024] Figure 3 This is a schematic diagram of the structure of the sound chamber shell provided by this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the elastic sleeve provided by this utility model;

[0026] Figure 5 This is a cross-sectional view of the microphone core provided by this utility model at the fan ring portion;

[0027] Figure 6 This is a cross-sectional view of the microphone core provided by this utility model at the retaining ring portion;

[0028] Figure 7 This is an exploded view of the microphone core structure provided by this utility model;

[0029] Figure 8 This is a structural cross-sectional view of the main shell provided by this utility model;

[0030] Figure 9 This is a schematic diagram of the main shell provided by this utility model;

[0031] Figure 10 This is a cross-sectional view of the microphone core provided by this utility model at the main shell.

[0032] Figure 11 This is a schematic diagram of the top cover provided by this utility model.

[0033] In the picture:

[0034] 100. Sound chamber shell; 110. Sound cavity; 120. Slot; 121. First annular groove; 122. Second annular groove;

[0035] 200, Elastic sleeve; 201, Silencing channel; 210, Snap-fit ​​part; 211, Fan ring part; 212, Snap-fit ​​ring part; 220, First connecting part; 221, First silencing hole; 230, Second connecting part; 231, Second silencing hole; 240, Third silencing hole;

[0036] 300. Main shell; 301. Upper chamber; 302. Lower chamber; 303. Sound transmission hole; 3031. First sound transmission hole; 3032. Second sound transmission hole; 310. Partition plate; 311. First perforation; 312. Protruding ring; 320. Protrusion; 321. Sound transmission groove; 330. Baffle plate;

[0037] 400, Magnetic field assembly; 401, Magnetic groove; 410, Magnetic guide bowl; 411, Second perforation; 420, Magnet; 430, Magnetic guide component;

[0038] 500, diaphragm;

[0039] 600. Damping components;

[0040] 710. Crimping component; 711. Third through hole; 720. Screw-in component;

[0041] 800. Tuning diaphragm; 810. First tuning diaphragm; 820. Second tuning diaphragm;

[0042] 900. Top cover; 910. Top plate; 911. First through hole; 920. Outer edge; 921. Second through hole; 922. Rib;

[0043] 1000, sponge pad. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] Reference Figures 1 to 6 As shown, this embodiment provides a microphone core, which includes a sound chamber shell 100 and an elastic sleeve 200. The sound chamber shell 100 has a sound cavity 110, and a slot 120 is provided on the outer periphery of the sound chamber shell 100. The elastic sleeve 200 is sleeved on the outside of the sound chamber shell 100, and a snap-fit ​​portion 210 is provided inside the elastic sleeve 200, snapping into the slot 120. A sound-absorbing channel 201 is formed between the inner wall of the elastic sleeve 200 and the outer periphery of the sound chamber shell 100.

[0049] In this embodiment, the elastic sleeve 200 is fitted over the sound chamber shell 100, and the snap-fit ​​part 210 snaps into the slot 120, facilitating the assembly between the sound chamber shell 100 and the elastic sleeve 200. Furthermore, the snap-fit ​​part 210 prevents the inner wall of the elastic sleeve 200 from contacting the outer peripheral wall of the sound chamber shell 100, thus forming a noise-absorbing channel 201 between them. This noise-absorbing channel 201 helps to attenuate sound waves transmitted into the sound chamber 110 from the outside, achieving a noise reduction effect. In addition, the fact that the inner wall of the elastic sleeve 200 does not contact the outer peripheral wall of the sound chamber shell 100 improves the deformation capacity of the elastic sleeve 200, thereby reducing the vibration of the sound chamber shell 100 caused by external forces.

[0050] For example, the elastic sleeve 200 can be made of rubber, which can not only absorb or reflect sound waves to reduce noise, but also has a good shock absorption effect.

[0051] In this embodiment, reference is made to Figures 2 to 6As shown, the sound chamber shell 100 is provided with at least two annular grooves spaced apart along the height direction. The snap-fit ​​part 210 is provided in a one-to-one correspondence with the annular groove. The snap-fit ​​part 210 snaps into the corresponding annular groove, which helps to improve the connection stability between the sound chamber shell 100 and the elastic sleeve 200.

[0052] In one feasible embodiment, the slot 120 includes a first annular groove 121 and a second annular groove 122 spaced apart along the height direction of the chamber shell 100. The first annular groove 121 is located above the second annular groove 122, that is, the slot 120 includes two annular grooves. The engaging portion 210 includes a boss assembly and a retaining ring portion 212. The boss assembly includes at least two fan-shaped ring portions 211 spaced apart along the circumference of the elastic sleeve 200. The fan-shaped ring portions 211 engage in the first annular groove 121, and the retaining ring portions 212 engage in the second annular groove 122. When assembling the chamber shell 100 and the elastic sleeve 200, the fan-shaped ring portions 211 first contact the outer periphery of the chamber shell 100. The fan-shaped ring portions 211 are more prone to deformation than the retaining ring portions 212, which is beneficial for the insertion of the chamber shell 100 into the elastic sleeve 200. Furthermore, the stability of the retaining ring 212 engaging in the second annular groove 122 is better than that of the fan ring 211 engaging in the first annular groove 121, which is beneficial to improving the connection stability between the sound chamber shell 100 and the elastic sleeve 200.

[0053] For example, the retaining ring portion 212 is annular.

[0054] For example, when the number of annular grooves on the sound chamber shell 100 is greater than two, the snap-fit ​​portion 210 corresponding to at least the topmost annular groove is set as a boss group, and the snap-fit ​​portion 210 corresponding to at least the bottommost annular groove is set as a snap ring portion 212. In some embodiments, except for the snap-fit ​​portion 210 corresponding to the bottommost annular groove, the remaining snap-fit ​​portions 210 can all be set as boss groups.

[0055] In one feasible implementation, a plurality of first connecting portions 220 are provided between the fan ring portion 211 and the inner wall of the elastic sleeve 200. A first silencing hole 221 is formed between the fan ring portion 211, the two first connecting portions 220 corresponding to and adjacent to the fan ring portion 211, and the inner wall of the elastic sleeve 200. Sound waves passing through the first silencing hole 221 have a silencing effect, which is beneficial for noise reduction.

[0056] For example, three, four or five first connecting portions 220 are provided between the fan ring portion 211 and the inner wall of the elastic sleeve 200.

[0057] In one feasible implementation, a plurality of second connecting portions 230 are provided between the retaining ring portion 212 and the inner wall of the elastic sleeve 200. A second silencing hole 231 is formed between the retaining ring portion 212, two adjacent second connecting portions 230, and the inner wall of the elastic sleeve 200. Sound waves passing through the second silencing hole 231 have a silencing effect, which is beneficial for noise reduction.

[0058] For example, six, eight or ten second connecting portions 230 are provided between the retaining ring portion 212 and the inner wall of the elastic sleeve 200.

[0059] For example, the first connecting part 220 and the second connecting part 230 correspond one-to-one along the height direction of the sound chamber shell 100.

[0060] It is understandable that a third silencing hole 240 is formed between the outer peripheral wall of the sound chamber shell 100, the two adjacent fan rings 211, and the inner wall of the elastic sleeve 200. Sound waves passing through the third silencing hole 240 have a silencing effect, which is beneficial for noise reduction.

[0061] In one feasible implementation, along the height direction of the sound chamber shell 100, the height H1 of the first connecting part 220 is less than the height H2 of the fan ring part 211, and the height H3 of the second connecting part 230 is less than the height H4 of the retaining ring part 212. This facilitates the deformation of the elastic sleeve 200 at the fan ring part 211 and the retaining ring part 212, making it convenient to assemble and disassemble the sound chamber shell 100 and the elastic sleeve 200.

[0062] In one feasible embodiment, along the height direction of the sound chamber shell 100, the top of the fan ring portion 211 protrudes from the first connecting portion 220, and the bottom of the retaining ring portion 212 protrudes from the second connecting portion 230. This is beneficial to improving the stability between the sound chamber shell 100 and the elastic sleeve 200, and also beneficial to improving the uniformity of force transmission between the sound chamber shell 100 and the elastic sleeve 200 through the fan ring portion 211 and the retaining ring portion 212.

[0063] In this embodiment, reference is made to Figure 1 , Figures 7 to 9 As shown, the microphone core also includes a main shell 300, the bottom of which is inserted into the top of the sound chamber shell 100 for easy assembly.

[0064] Specifically, the top of the main shell 300 is provided with an upper chamber 301, and the bottom of the main shell 300 is provided with a lower chamber 302 that communicates with the upper chamber 301, wherein the sound chamber 110 is connected to the lower chamber 302.

[0065] Specifically, the periphery of the main shell 300 is provided with a sound-permeable hole 303 that communicates with the upper chamber 301.

[0066] For example, the sound chamber shell 100 is inserted into the lower chamber 302.

[0067] For example, the main housing 300 and the sound chamber housing 100 can be glued together.

[0068] In one feasible implementation, a partition 310 is provided inside the main shell 300. The main shell 300 is divided into an upper chamber 301 and a lower chamber 302 by the partition 310. The partition 310 is provided with a first through hole 311 that connects the upper chamber 301 and the lower chamber 302, which facilitates the forming of the main shell 300.

[0069] In this embodiment, reference is made to Figures 7 to 10 As shown, the microphone core also includes a magnetic field assembly 400 and a diaphragm 500. The magnetic field assembly 400 is located inside the upper chamber 301, and the diaphragm 500 is located on top of the magnetic field assembly 400 for easy assembly. It is understood that the diaphragm 500 is connected to a coil (not shown) extending into the magnetic field assembly 400. When the diaphragm 500 vibrates, it can drive the coil to move up and down, causing the coil to cut magnetic field lines, thereby generating current and converting sound waves into electrical current to achieve sound acquisition.

[0070] For example, the coil uses high-purity copper-clad aluminum wire, which helps to improve electromagnetic conversion efficiency, enhance the ability to convert sound signals of different frequencies, and broaden the frequency response range.

[0071] For example, the magnetic field assembly 400 includes a magnetic cup 410, a magnet 420, and a magnetic guide 430. Both the magnet 420 and the magnetic guide 430 are disposed within the magnetic cup 410. The magnetic guide 430 is located on top of the magnet 420. A magnetic groove 401 is formed between the periphery of the magnetic guide 430 and the inner wall of the magnetic cup 410, and at least a portion of the coil is located within the magnetic groove 401. It is understood that the magnetic field lines within the magnetic groove 401 are relatively dense, which is beneficial for sound acquisition.

[0072] For example, the longitudinal section of the magnetic cup 410 is U-shaped, the magnet 420 is cylindrical, and the magnetic conductors 430 are all disc-shaped.

[0073] For example, the top of the partition 310 is provided with a protruding ring 312, and the magnetic cup 410 abuts against the protruding ring 312. The bottom of the magnetic cup 410 is provided with a plurality of second perforations 411, and sound waves can be propagated into the lower chamber 302 through the magnetic groove 401, the second perforations 411 and the first perforations 311.

[0074] In this embodiment, reference is made to Figures 7 to 10 As shown, the microphone core also includes a damping element 600, which is located within the lower chamber 302 for easy assembly. The damping element 600 includes, but is not limited to, damping paper, damping cotton, or a combination of both. It is understandable that different sound quality effects can be achieved by replacing the damping element 600.

[0075] For example, the microphone core also includes a crimping member 710, and a damping member 600 is clamped between the crimping member 710 and the partition 310. The crimping member 710 can be fastened to the main housing 300 by a screw connection 720, which facilitates disassembly and assembly.

[0076] For example, the crimping member 710 is provided with a plurality of third through holes 711.

[0077] In this embodiment, reference is made to Figures 7 to 10 As shown, the microphone core also includes a tuning diaphragm 800, which is attached to the outer periphery of the main shell 300 and blocks the sound transmission hole 303 to achieve tuning.

[0078] In one feasible embodiment, the main shell 300 has a plurality of protrusions 320 spaced circumferentially within the upper chamber 301, such as three, four, five, or six, with a sound-permeable groove 321 formed between two adjacent protrusions 320. The magnetic circuit assembly is sandwiched between the plurality of protrusions 320. The periphery of the main shell 300 is provided with a group of sound-permeable holes, each corresponding to a sound-permeable groove 321. Each group of sound-permeable holes includes at least one sound-permeable hole 303, which communicates with the corresponding sound-permeable groove 321. This facilitates balancing the air pressure on both sides of the diaphragm 500 and provides a noise reduction effect.

[0079] For example, the sound-permeable hole 303 can be set as an elongated hole, with the length direction of the sound-permeable hole 303 extending along the circumference of the main frame.

[0080] In one feasible implementation, a baffle 330 is connected between adjacent protrusions 320. The sound-permeable hole group includes a first sound-permeable hole 3031 and a second sound-permeable hole 3032. The first sound-permeable hole 3031 is located above the second sound-permeable hole 3032. At least part of the hole wall of the first sound-permeable hole 3031 is set lower than the top surface of the baffle 330, which is beneficial to balance the air pressure on both sides of the diaphragm 500, adjust the pickup directivity, such as the adjustment of cardioid pickup directivity, and has a noise reduction effect.

[0081] For example, an annular mounting groove (not shown) is formed between the baffle 330 and the protrusion 320, and the magnetic circuit assembly is disposed in the annular mounting groove, which helps to improve the positioning accuracy of the magnetic circuit assembly relative to the main housing 300.

[0082] For example, at least some of the sound-permeable holes 303 are set below the partition plate 310, such as the second sound-permeable hole 3032 being set below the partition plate 310. This helps to balance the air pressure on both sides of the diaphragm 500, adjust the sound pickup directionality, and has a noise reduction effect.

[0083] For example, the size of the first sound-permeable hole 3031 is larger than the size of the second sound-permeable hole 3032. Taking the example that both the first sound-permeable hole 3031 and the second sound-permeable hole 3032 are elongated holes, the length of the first sound-permeable hole 3031 is greater than the length of the second sound-permeable hole 3032, and the width of the first sound-permeable hole 3031 is greater than the width of the second sound-permeable hole 3032.

[0084] For example, a tuning diaphragm 800 can block at least one sound-permeable hole 303. For instance, the periphery of the main housing 300 is provided with four groups of sound-permeable holes, each group including a first sound-permeable hole 3031 and a second sound-permeable hole 3032. The tuning diaphragm 800 includes two first tuning diaphragms 810 and four second tuning diaphragms 820. One first tuning diaphragm 810 blocks two first sound-permeable holes 3031, and one second tuning diaphragm 820 blocks one second sound-permeable hole 3032.

[0085] In this embodiment, reference is made to Figure 10 and Figure 11 As shown, the microphone also includes a top cover 900, which is fitted onto the top of the main housing 300.

[0086] For example, the bottom of the outer edge 920 is lower than the second sound hole 3032 to protect the tuning diaphragm 800.

[0087] In one feasible implementation, the top cover 900 includes a top plate 910 and an outer edge 920 connected to each other. The top plate 910 is located above the upper chamber 301, and the outer edge 920 forms a chamber communicating with the sound hole 303 between itself and the outer periphery of the main frame.

[0088] For example, the top plate 910 is provided with a plurality of first through holes 911 communicating with the upper chamber 301.

[0089] For example, the top plate 910 may be provided with a sponge pad 1000 to cover the first through hole 911.

[0090] For example, a second through hole 921 is provided at the position corresponding to the first sound-permeable hole 3031 on the outer edge 920. Taking the first sound-permeable hole 3031 as an elongated hole as an example, a rib 922 is provided inside the second through hole 921, and the length direction of the rib 922 extends along the length direction of the first sound-permeable hole 3031. The shape of the second through hole 921 and the first sound-permeable hole 3031 can be the same.

[0091] It is understandable that for connection methods not explicitly stated in the text, common connection methods such as threaded connection, snap-fit, or adhesive connection can be used as needed.

[0092] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A microphone core, characterized in that, include: A sound chamber shell (100) having a sound cavity (110) and a slot (120) provided on the outer periphery of the sound chamber shell (100); An elastic sleeve (200) is fitted over the sound chamber shell (100). The elastic sleeve (200) has a snap-fit ​​part (210) inside, which snaps into the slot (120). A sound-absorbing channel (201) is formed between the inner wall of the elastic sleeve (200) and the outer periphery of the sound chamber shell (100).

2. The microphone core according to claim 1, characterized in that, The sound chamber shell (100) is provided with at least two annular grooves spaced apart along the height direction. The snap-fit ​​part (210) is provided in a one-to-one correspondence with the annular groove, and the snap-fit ​​part (210) snaps into the corresponding annular groove.

3. The microphone core according to claim 1, characterized in that, The slot (120) includes a first annular groove (121) and a second annular groove (122) spaced apart along the height direction of the sound chamber shell (100), with the first annular groove (121) located above the second annular groove (122); The snap-fit ​​portion (210) includes a boss assembly and a snap-fit ​​portion (212). The boss assembly includes at least two fan-ring portions (211) spaced apart circumferentially along the elastic sleeve (200). The fan-ring portions (211) snap into the first annular groove (121), and the snap-fit ​​portion (212) snaps into the second annular groove (122).

4. The microphone core according to claim 3, characterized in that, A plurality of first connecting portions (220) are provided between the fan ring portion (211) and the inner wall of the elastic sleeve (200), and a first silencing hole (221) is formed between the fan ring portion (211), the two first connecting portions (220) corresponding to and adjacent to the fan ring portion (211), and the inner wall of the elastic sleeve (200). A plurality of second connecting portions (230) are provided between the retaining ring portion (212) and the inner wall of the elastic sleeve (200), and a second silencing hole (231) is formed between the retaining ring portion (212), two adjacent second connecting portions (230), and the inner wall of the elastic sleeve (200).

5. The microphone core according to claim 4, characterized in that, Along the height direction of the sound chamber shell (100), the height of the first connecting part (220) is less than the height of the fan ring part (211), and the height of the second connecting part (230) is less than the height of the retaining ring part (212).

6. The microphone core according to claim 4, characterized in that, Along the height direction of the sound chamber shell (100), the top of the fan ring portion (211) protrudes from the first connecting portion (220), and the bottom of the retaining ring portion (212) protrudes from the second connecting portion (230).

7. The microphone core according to claim 1, characterized in that, The microphone core also includes a main shell (300), the top of the main shell (300) is provided with an upper chamber (301), the bottom of the main shell (300) is provided with a lower chamber (302) communicating with the upper chamber (301), the periphery of the main shell (300) is provided with a sound transmission hole (303) communicating with the upper chamber (301), the bottom of the main shell (300) is inserted and fitted with the top of the sound chamber shell (100), and the sound chamber (110) is connected to the lower chamber (302).

8. The microphone core according to claim 7, characterized in that, The main shell (300) has a plurality of protrusions (320) spaced circumferentially in the upper chamber (301), and a sound-permeable groove (321) is formed between two adjacent protrusions (320); The main shell (300) is provided with a sound-permeable hole group on its periphery. The sound-permeable hole group is provided in a one-to-one correspondence with the sound-permeable groove (321). The sound-permeable hole group includes at least one sound-permeable hole (303), and the sound-permeable hole (303) is connected to the corresponding sound-permeable groove (321).

9. The microphone core according to claim 8, characterized in that, A baffle (330) is connected between adjacent protrusions (320); the sound-permeable hole group includes a first sound-permeable hole (3031) and a second sound-permeable hole (3032), the first sound-permeable hole (3031) is located above the second sound-permeable hole (3032), and at least a portion of the hole wall of the first sound-permeable hole (3031) is set below the top surface of the baffle (330).

10. The microphone core according to claim 8, characterized in that, The main shell (300) is provided with a partition (310), and the main shell (300) is divided into an upper chamber (301) and a lower chamber (302) by the partition (310). The partition (310) is provided with a first through hole (311) connecting the upper chamber (301) and the lower chamber (302). At least part of the sound transmission hole (303) is set below the partition (310).

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