Digital microphone with characteristics of strong wind resistance, oil resistance and high temperature resistance

Abstract

The utility model provides a digital microphone with characteristics of strong wind resistance, oil resistance and high temperature resistance. The digital microphone comprises an upper shell and a lower shell which are buckled up and down. The upper shell comprises a bottom plate and a turned-over edge turned over towards one side of the bottom plate, and a first cavity with an opening in one end is defined by the bottom plate and the turned-over edge. The lower shell comprises a mounting part and an annular surrounding plate arranged on the mounting part, and a second cavity is formed in the surrounding plate. The surrounding plate is inserted into the first cavity, and the shape of the surrounding plate is matched with the inner shape of the turned-over edge. A main plate is installed in the installation part, a windproof piece abuts against the upper portion of the main plate, the windproof piece is arranged in the second cavity, an oil stain prevention piece is arranged above the windproof piece, and the bottom plate is buckled on the oil stain prevention piece. The bottom plate is provided with air holes, and the oil contamination prevention piece comprises a film arranged below the air holes. According to the utility model, the stability and reliability of sound signal acquisition of the mainboard microphone can be ensured in a strong wind mode, noise increase caused by the arrangement of an open space is avoided, the sound acquisition accuracy is improved, the structure is simple, and the enterprise cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of digital microphones, and particularly relates to a digital microphone with strong wind resistance, oil resistance and high temperature resistance characteristics. Background Technique

[0002] In the field of smart home, a smart range hood can automatically sense the spatial state of the working environment and automatically control and receive control instructions from users inside or remotely from the residence. In the smart range hood, a digital microphone monitors and collects data on the surrounding environment in real time, and then makes a judgment on the situation of the surrounding environment. Moreover, the digital microphone is also used for the voice control switch function, improving the user experience and increasing the practicality of the range hood.

[0003] Wind noise is generated by the interaction between moving objects in a flow field or by the interaction between fluids caused by the turbulent motion of the fluid itself. The generation mechanism of wind noise in different scenarios is different. Wind noise mainly occurs in the low-frequency range of 0 - 500 Hz and decays rapidly towards high frequencies. Sudden gusts often cause wind noise with a duration of several to several hundred milliseconds. And due to the suddenness of gusts, wind noise may generate high amplitudes exceeding the nominal speech amplitude, so wind noise has significant non-stationary characteristics. During the use of a range hood, there is a certain relationship between the exhaust air volume and the noise. The greater the exhaust air volume, the louder the sound. Automatically adjusting the exhaust air volume due to different generated oilsmoke easily causes changes in wind noise.

[0004] Wind noise in the audio acquisition scenario is mainly caused by the turbulent air flow near the microphone diaphragm, causing the microphone to generate a relatively high signal level. Wind noise will cause serious damage to the audio signal, significantly reducing the signal-to-noise ratio of the speech signal. At the same time, the appearance of wind noise will also significantly reduce the quality and intelligibility of speech. Therefore, to improve the audio acquisition quality, wind noise must be suppressed.

[0005] From the perspective of energy conservation, most range hoods use a strong wind mode during use, especially when the suction and exhaust requirements are high. In the strong wind mode, due to the large exhaust air volume, the voice enhancement algorithm fails. Because the existing digital microphones have poor sealing effects, the collected voice data obtained by the microphones is inaccurate, which easily causes the range hood to obtain incorrect instructions, not only reducing the comfort of user use, but also easily triggering potential safety hazards. Content of the Utility Model

[0006] In view of this, the utility model aims to propose a digital microphone with strong wind resistance, oil resistance and high temperature resistance characteristics, so as to improve the sealing effect of the digital microphone, improve the ability to suppress wind noise, and improve the wind resistance performance.

[0007] To achieve the above object, the technical solution of the utility model is realized as follows:

[0008] A digital microphone with strong wind resistance, oil resistance and high temperature resistance characteristics, comprising an upper housing and a lower housing that are snap-fitted up and down;

[0009] The upper housing includes a bottom plate and a flanging that is folded to one side of the bottom plate. A first cavity with one end open is formed between the bottom plate and the flanging;

[0010] The lower housing includes a mounting portion and an annular enclosing plate provided on the mounting portion. A second cavity is formed inside the enclosing plate;

[0011] The enclosing plate is inserted into the first cavity, and the outer shape of the enclosing plate is adapted to the inner shape of the flanging;

[0012] A main board is installed inside the mounting portion. A windproof member is abutted above the main board. The windproof member is provided inside the second cavity. An oil-proof member is provided above the windproof member. The bottom plate is buckled on the oil-proof member;

[0013] The bottom plate is provided with air holes. The oil-proof member includes a thin film provided below the air holes.

[0014] Further, the air permeability of the thin film is 1300 - 1500 ml / min cm 2 @7kpa.

[0015] Further, the material of the thin film is made of polytetrafluoroethylene.

[0016] Further, the end of the flanging abuts against the upper plane of the mounting portion. The oil-proof member further includes a frame surrounding the periphery of the thin film. The frame is made of PC material;

[0017] The bottom plate abuts the frame against the enclosing plate.

[0018] Further, a plurality of outwardly protruding flanges are provided along the circumference of the upper housing. The mounting portion is provided with protruding portions corresponding to the flanges;

[0019] Threaded holes are provided on the flanges, through holes are provided on the protruding portions, and the upper housing and the lower housing are bolted together.

[0020] Further, the mounting portion includes a horizontal plate and a mounting seat that are connected up and down; the enclosing plate is arranged on the horizontal plate;

[0021] A receiving cavity for receiving the main board is formed inside the horizontal plate. First mounting holes for mounting the main board are provided at the bottom of the receiving cavity. The main board is bolted to the horizontal plate.

[0022] Further, a circular shaft protruding downward is provided on the lower plane of the horizontal plate. The circular shaft corresponds to the first mounting hole, and the first mounting hole extends from the horizontal plate into the circular shaft.

[0023] Further, a through groove is provided on one side of the horizontal plate, and the through groove is used for the wiring of the main board to pass through.

[0024] Further, the mounting seat includes two cross plates arranged below the horizontal plate, and support plates oppositely connected to both sides of the cross plates;

[0025] The two cross plates are arranged at intervals along the width direction of the horizontal plate;

[0026] A rectangular cavity communicating with the accommodation cavity is formed on the cross plate from the horizontal plate. The rectangular cavity is used to accommodate the drying parts, and the two drying parts are respectively arranged on both sides of the main board.

[0027] Further, the film is adhesively fixed to the bottom plate.

[0028] Compared with the prior art, the present utility model has the following advantages:

[0029] For the digital microphone with strong wind resistance, oil resistance and high temperature resistance of the present utility model, the main board, the wind protection part and the oil protection part are stacked in sequence from bottom to top. By inserting the surrounding plate of the lower shell into the flanging of the upper shell, it can effectively withstand the external continuous high temperature, so that the microphone on the main board is not affected by the high temperature. The structure of the present utility model is simple, the number of parts is small, and the installation is convenient, reducing the production cost of enterprises.

[0030] In addition, the overlapping part of the first cavity and the second cavity is the sound transmission cavity of the main board. The film located below the ventilation hole is used to isolate external oil stains and high temperature to protect the wind protection part and the main board from oil stains and high temperature. And the film also has a good sound transmission effect, ensuring the stability and reliability of the sound signal collected by the microphone of the main board.

[0031] In addition, the wind protection part arranged below the oil protection part is used to absorb and reflect sound waves to reduce noise, and can effectively collect sound sources in a wind noise environment with a wind speed of 21 meters per second. And because the sound transmission cavity where the microphone is set is filled with the wind protection part without an empty space, the problem of sound short - circuit in an empty space is avoided. Especially in the low - frequency part, the sensitivity of sound collection can be improved, and the increase of noise due to the arrangement of the empty space can be avoided, improving the accuracy of sound collection.

[0032] And, the air permeability of the film is set to 1300 - 1500 ml / min / cm 2. At 7 kPa, a film with ultra-high air permeability is used. By setting the film with good air permeability, it is ensured that sound waves can propagate freely, so as to accurately measure the performance of the microphone.

[0033] The present utility model also uses a film made of polytetrafluoroethylene material, which has reliable waterproof ability, as well as functions of heat dissipation and pressure difference balance. It also has good air permeability and hydrophobic and oleophobic properties, effectively avoiding the oil stains of the range hood on the basis of waterproofing, and preventing the oil stains in the flue gas from contaminating the wind protection piece and the main board. Moreover, the polytetrafluoroethylene film has excellent high-temperature resistance performance and can remain stable at a temperature up to 260 °C (500 °F) without degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0035] Figure 1 It is a schematic perspective structure diagram of the first perspective of the digital microphone with strong wind resistance, oil stain prevention and high temperature resistance according to the embodiment of the present utility model;

[0036] Figure 2 It is a schematic perspective structure diagram of the second perspective of the digital microphone with strong wind resistance, oil stain prevention and high temperature resistance according to the embodiment of the present utility model;

[0037] Figure 3 It is a schematic bottom view structure diagram of the digital microphone with strong wind resistance, oil stain prevention and high temperature resistance according to the embodiment of the present utility model;

[0038] Figure 4 It is Figure 3 the sectional view at A-A in

[0039] Figure 5 It is Figure 3 the sectional view at B-B in

[0040] Figure 6 It is an exploded view of the digital microphone with strong wind resistance, oil stain prevention and high temperature resistance according to the embodiment of the present utility model;

[0041] Figure 7 It is a schematic perspective structure diagram of the first perspective of the upper shell according to the embodiment of the present utility model;

[0042] Figure 8 It is a schematic perspective structure diagram of the second perspective of the upper shell according to the embodiment of the present utility model;

[0043] Figure 9Schematic diagram of the three-dimensional structure of the lower housing according to the embodiment of the present utility model from the first perspective;

[0044] Figure 10 Schematic diagram of the three-dimensional structure of the lower housing according to the embodiment of the present utility model from the second perspective;

[0045] Figure 11 Schematic diagram of the three-dimensional structure of the lower housing according to the embodiment of the present utility model from the third perspective;

[0046] Figure 12 Test frequency spectrum diagram of the digital microphone with strong wind resistance, anti - oil pollution and high - temperature resistance characteristics according to the embodiment of the present utility model and the digital microphone of the prior art.

[0047] Explanation of reference numerals:

[0048] 1. Upper housing; 2. Lower housing; 3. Main board; 4. Wind - proof member; 5. Anti - oil - pollution member; 6. Drying member;

[0049] 101. Flange; 102. First cavity; 103. Bottom plate; 104. Flange;

[0050] 201. Mounting part; 202. Enclosing board; 203. Second cavity;

[0051] 501. Film; 502. Frame;

[0052] 1031. Vent hole;

[0053] 1041. Threaded hole;

[0054] 2011. Protrusion; 2012. Horizontal plate; 2013. Mounting seat; 2014. Through hole; 2015. Accommodating cavity; 2016. First mounting hole; 2017. Round shaft; 2018. Through groove;

[0055] 20131. Horizontal board; 20132. Rectangular cavity; 20133. Second mounting hole. Detailed implementation manners

[0056] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0057] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model. Additionally, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] Furthermore, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific circumstances.

[0059] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0060] This embodiment relates to a digital microphone with strong wind resistance, oil resistance, and high-temperature resistance characteristics. The digital microphone includes an upper housing 1 and a lower housing 2 that are buckled up and down. The upper housing 1 includes a bottom plate 103 and a flanging 101 that is folded towards one side of the bottom plate 103. A first cavity 102 with one end open is formed between the bottom plate 103 and the flanging 101. The lower housing 2 includes an installation part 201 and an annular enclosing plate 202 provided on the installation part 201. A second cavity 203 is formed inside the enclosing plate 202.

[0061] Among them, the enclosing plate 202 is inserted into the first cavity 102, and the outer shape of the enclosing plate 202 is adapted to the inner shape of the flanging 101. A main board 3 is installed inside the installation part 201. A windproof member 4 abuts above the main board 3. The windproof member 4 is provided inside the second cavity 203. An oil-proof member 5 is provided above the windproof member 4. The bottom plate 103 is buckled on the oil-proof member 5. A ventilation hole 1031 is provided on the bottom plate 103. The oil-proof member 5 includes a film 501 provided below the ventilation hole 1031.

[0062] The digital microphone with strong wind resistance, oil resistance, and high-temperature resistance characteristics in this embodiment stacks the main board 3, the windproof member 4, and the oil-proof member 5 in sequence from bottom to top. By inserting the enclosing plate 202 of the lower housing 2 into the flanging 101 of the upper housing 1, it can effectively withstand external continuous high temperatures, so that the microphone on the main board 3 is not affected by high temperatures. The structure of the present utility model is simple, the number of parts is small, the installation is convenient, and the production cost of the enterprise is reduced.

[0063] In addition, the overlapping part of the first cavity 102 and the second cavity 203 is the sound transmission cavity of the main board 3. The film 501 located below the ventilation hole 1031 is used to isolate external oil stains and high temperatures to protect the windproof member 4 and the main board 3 from the influence of oil stains and high temperatures. Moreover, the film 501 also has a good sound transmission effect, ensuring the stability and reliability of the sound signal collected by the microphone of the main board 3.

[0064] In addition, the windproof member 4 provided below the oil-proof member 5 is used to absorb and reflect sound waves to reduce noise, and can effectively collect sound sources in a wind noise environment with a wind speed of 21 meters per second. And because the sound transmission cavity where the microphone is set is filled with the windproof member 4 without an empty space, the problem of sound short-circuit in the empty space is avoided. Especially in the low-frequency part, the sensitivity of sound collection can be improved, and the addition of noise due to the layout of the empty space can be avoided, improving the accuracy of sound collection.

[0065] Based on the above overall introduction, as Figures 1 to 6 shown, an exemplary structure of the digital microphone with strong wind resistance, oil-proof and high-temperature resistance characteristics in this embodiment, as Figures 1 to 2 shown, the digital microphone of this embodiment is mainly fixedly connected by buckling the upper shell 1 and the lower shell 2. The main board 3 includes a circuit board and a microphone connected to the circuit board. The main board 3 is installed on the lower shell 2. The windproof member 4 is made of rectangular windproof cotton and completely fills the second cavity 203 formed by the surrounding plate 202. The oil-proof member 5 is squeezed and fixed between the upper and lower shells 2 by the upper shell and the surrounding plate 202.

[0066] As a preferred embodiment, the air permeability of the film 501 is 1300 - 1500 ml / min cm 2 @7kpa. The film 501 with ultra-high air permeability is adopted. By setting the film 501 with good air permeability, it is ensured that sound waves can propagate freely, so as to accurately measure the performance of the microphone.

[0067] Preferably, the material of the film 501 is polytetrafluoroethylene. The polytetrafluoroethylene material not only has reliable waterproof ability, as well as heat dissipation and balance pressure difference functions, but also has good air permeability and hydrophobic and oleophobic properties, effectively avoiding the oil stains of the range hood on the basis of waterproofing, and preventing the oil stains in the flue gas from polluting the windproof member 4 and the main board 3. Moreover, the polytetrafluoroethylene film 501 has excellent high-temperature resistance performance and can remain stable at a temperature of up to 260 °C (500 °F) without degradation.

[0068] Just as Figures 6 to 8 shown, the upper shell 1 is formed into a cuboid structure. The ventilation hole 1031 is a rectangular through hole 2014, and the first cavity 102 is surrounded by a rectangular flange 101 in a ring shape to form a rectangular cavity 20132. As Figure 9As shown, the surrounding plate 202 is formed into a rectangular frame structure, and the second cavity 203 is conformally set as a rectangular cavity 20132 structure. The windproof member 4 is adapted to the outer shape of the second cavity 203. Its height is equal to the height of the second cavity 203, so that the oil-proof member 5 can be laid flat above the surrounding plate 202 and the windproof member 4 to increase the contact area and improve the sound transmission effect.

[0069] As a preferred embodiment, as Figures 1 to 6 shown, the end of the flanging 101 abuts against the upper plane of the mounting portion 201. The oil-proof member 5 further includes a frame 502 surrounding the periphery of the film 501, and the frame 502 is made of PC material. The bottom plate 103 abuts the frame 502 against the surrounding plate 202. As Figure 7 and Figure 8 shown, the area of the first cavity 102 is larger than the ventilation hole 1031, so as to facilitate the bottom plate 103 to abut against the oil-proof member 5.

[0070] As a specific embodiment, the thickness of the film 501 in this embodiment is 0.01 mm. For easy fixation, an annular frame 502 is provided around the film 501, and the film 501 is fixed to the frame 502 by bonding. In other embodiments, the film 501 can also be fixed by crimping.

[0071] Preferably, the frame 502 in this embodiment is made of PC material. PC plastic, also known as polycarbonate, is a tough thermoplastic resin. Its main characteristics are light weight, strong flexibility, and high elasticity. The flexibility and elasticity of this material make it perform well in various applications, able to withstand certain pressure and impact, and is suitable for the use of the range hood in the strong wind mode. Moreover, due to its own elastic properties, it increases the sealing performance between the upper housing 1 and the lower housing 2, avoiding noise caused by poor sealing between the upper housing 1 and the lower housing 2, and thus improving the wind noise reduction effect. In this embodiment, the thickness of the frame 502 is 0.5 mm.

[0072] Furthermore, as Figures 7 to 11 shown, a plurality of outwardly protruding flanges 104 are provided along the circumference of the upper housing 1, and corresponding protrusions 2011 are provided on the mounting portion 201. Threaded holes 1041 are provided on the flanges 104, and through holes 2014 are provided on the protrusions 2011. The upper housing 1 and the lower housing 2 are bolted together. In this embodiment, the upper housing 1 and the lower housing 2 are integrally formed by casting, and of course, they can also be processed by machining.

[0073] As Figures 7 to 8As shown, the flange 104 is in the shape of a semi-cylindrical column. In this embodiment, six flanges 104 are provided and are respectively arranged around the upper housing 1. The length of the flange 104 is the same as the thickness of the upper housing 1. The threaded hole 1041 is formed on the side of the flange 104 close to the lower housing 2. The protruding portion 2011 is a semi-circular sheet structure with the same cross-section as the flange 104. As Figure 6 shown, the bolt is screwed into the threaded hole 1041 from the lower side of the protruding portion 2011 to fix the upper housing 1 and the lower housing 2. This not only facilitates installation and disassembly but also ensures tightness.

[0074] As a preferred embodiment, as Figures 9 to 11 shown, the mounting portion 201 includes a horizontal plate 2012 and a mounting seat 2013 which are connected up and down. The surrounding plate 202 is mounted on the horizontal plate 2012. A receiving cavity 2015 for receiving the main board 3 is formed in the horizontal plate 2012. A first mounting hole 2016 for mounting the main board 3 is provided at the bottom of the receiving cavity 2015. The main board 3 is bolted to the horizontal plate 2012. In this embodiment, the first mounting hole 2016 is the threaded hole 1041. The outer shape of the circuit board is adapted to the receiving cavity 2015, which has a positioning effect on the main board 3 and can protect the circuit board and the microphone.

[0075] Furthermore, as Figure 10 shown, a circular shaft 2017 protruding downward is provided on the lower plane of the horizontal plate 2012. The circular shaft 2017 is arranged corresponding to the first mounting hole 2016, and the first mounting hole 2016 extends from the horizontal plate 2012 into the circular shaft 2017. By providing the circular shaft 2017, the setting length of the first mounting hole 2016 can be increased to increase the mounting strength of the main board 3.

[0076] As Figure 11 shown, a through slot 2018 is provided on one side of the horizontal plate 2012. The through slot 2018 is used for the wiring of the main board 3 to pass through. Before installation, first fix the main board 3 on the lower housing 2 and pass the wiring of the main board 3 through the through slot 2018. After installation, the through slot 2018 is bonded and sealed with sealant to prevent external wind noise from entering through the through slot 2018 and affecting the accuracy of the sound signal of the microphone.

[0077] In addition, as Figure 10 shown, the mounting seat 2013 includes two cross plates 20131 arranged below the horizontal plate 2012, and support plates relatively connected to both sides of the cross plates 20131. The two cross plates 20131 are arranged at intervals along the width direction of the horizontal plate 2012. A rectangular cavity 20132 communicating with the receiving cavity 2015 is formed from the horizontal plate 2012 to the cross plates 20131. The rectangular cavity 20132 is used to accommodate the drying member 6, and the two drying members 6 are respectively arranged on both sides of the main board 3.

[0078] In the maintenance of digital microphones, it is very important to keep the microphone dry. If the microphone is stored without being dry, it may cause the diaphragm of the microphone to be affected by moisture, which will affect the sound transmission quality. Therefore, the setting of the drying sheet can ensure the normal operation of the microphone and improve the sound quality by absorbing the possible moisture and maintaining a dry state. As Figures 5 to 6 shown, in this embodiment, two drying members 6 are provided on both sides of the main board 3. The drying member 6 is made of the same material as the desiccant in the prior art. Its main purpose is to prevent the performance of the circuit board and the microphone from being degraded or damaged due to the gas with water vapor, ensure the sound capture quality, and extend the service life of the main board 3.

[0079] Through the above structural setting of the lower housing 2, the main board 3, the drying member 6, and the windproof member 4 are first installed on the lower housing 2. And, in this embodiment, the thin film 501 is bonded and fixed to the bottom plate 103, and then the upper housing 1 is directly buckled on the lower housing 2 to complete the installation. The digital microphone of this embodiment has strong wind resistance, anti-oil pollution and high temperature resistance characteristics. The structure is simple, the number of parts is small, and it can ensure a good wind noise reduction effect, is suitable for use in strong wind modes, and can also prevent oil pollution and high temperature from damaging the main board 3, improving the practicality of the digital sensor.

[0080] In addition, in order to achieve a better sound collection effect, the height of the surrounding plate 202 in this embodiment is 14 mm. Such a setting not only meets the shape requirements of the digital microphone, but also mainly ensures the effective improvement of wind noise by the windproof member 4. Moreover, as Figures 4 to 5 shown, the bottom plate 103 abuts against the frame 502, causing the frame 502 to elastically deform due to the extrusion, improving the connection tightness between the upper housing 1 and the lower housing 2, ensuring the overall airtightness of the sound transmission cavity, and thus ensuring the accuracy of sound collection.

[0081] Furthermore, as Figures 9 to 10 shown, the support plate is provided with a second mounting hole 20133, and the second mounting hole 20133 is used to connect to an external device. In this embodiment, the digital sensor is fixed to the range hood through the second mounting hole 20133 and bolts. The second mounting hole 20133 is a circular through hole 2014, which increases the convenience of installation.

[0082] As Figure 12 shown, the spectrum comparison of the digital microphone of this embodiment and the existing digital microphone. The horizontal axis represents the frequency, and the vertical axis represents the energy. The blue curve is the signal harmonic collected by the digital microphone of this embodiment, and the green curve is the signal harmonic collected by the digital microphone in the prior art. Figure 12 shown in, below the low-frequency band of -87HZ, the energy of the blue curve is lower than that of the green curve. By reducing the low-frequency gain, the ability to suppress wind noise is better and the wind resistance is better.

[0083] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A digital microphone with strong wind resistance, oil resistance and high temperature resistance, characterized by: It comprises an upper shell (1) and a lower shell (2) which are buckled together; The upper shell (1) comprises a bottom plate (103) and a flange (101) folded toward one side of the bottom plate (103), wherein a first cavity (102) with an opening at one end is formed between the bottom plate (103) and the flange (101); The lower shell (2) comprises a mounting portion (201) and an annular enclosure (202) arranged on the mounting portion (201), and a second cavity (203) is formed in the enclosure (202); The enclosure plate (202) is inserted into the first cavity (102), and the outer shape of the enclosure plate (202) is adapted to the inner shape of the flange (101); A main board (3) is installed in the installation portion (201), a windproof member (4) is abutted against the main board (3), the windproof member (4) is arranged in the second cavity (203), an oil-proof member (5) is arranged above the windproof member (4), and the bottom plate (103) is buckled on the oil-proof member (5); The bottom plate (103) is provided with an air hole (1031), and the oil-fouling-proof component (5) comprises a film (501) provided below the air hole (1031).

2. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 1 is characterized in that: The air permeability of the film (501) is 1300-1500 ml / min cm 2 @7kpa.

3. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 2, characterized in that: The film (501) is made of polytetrafluoroethylene.

4. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 3 is characterized in that: The end of the flange (101) abuts against the upper plane of the mounting portion (201), and the oil-proof component (5) further comprises a frame (502) surrounding the film (501), and the frame (502) is made of PC material; The bottom plate (103) abuts the frame (502) against the enclosure plate (202).

5. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 3 is characterized in that: A plurality of flanges (104) protruding outward are provided along the circumference of the upper shell (1), and a protrusion (2011) corresponding to the flange (104) is provided on the mounting portion (201); The flange (104) is provided with a threaded hole (1041), the protruding portion (2011) is provided with a through hole (2014), and the upper shell (1) is connected to the lower shell (2) by bolts.

6. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 1, characterized in that: The mounting portion (201) comprises a horizontal plate (2012) and a mounting seat (2013) connected up and down; The enclosure plate (202) is arranged on the horizontal plate (2012); A receiving cavity (2015) for receiving the main board (3) is formed in the horizontal plate (2012), a first mounting hole (2016) for mounting the main board (3) is provided at the bottom of the receiving cavity (2015), and the main board (3) is bolted to the horizontal plate (2012).

7. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 6, characterized in that: A circular shaft (2017) protruding downward is provided on the lower plane of the horizontal plate (2012), and the circular shaft (2017) is arranged corresponding to the first mounting hole (2016), and the first mounting hole (2016) extends from the horizontal plate (2012) into the circular shaft (2017).

8. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 7, characterized in that: A through slot (2018) is provided on one side of the horizontal plate (2012), and the through slot (2018) is used for the wiring of the main board (3) to pass through.

9. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to claim 6, characterized in that: The mounting seat (2013) comprises two transverse plates (20131) arranged below the horizontal plate (2012), and support plates relatively connected to both sides of the transverse plates (20131); The two transverse plates (20131) are arranged at intervals along the width direction of the horizontal plate (2012); A rectangular cavity (20132) communicating with the accommodating cavity (2015) is formed from the horizontal plate (2012) to the transverse plate (20131), and the rectangular cavity (20132) is used to accommodate a drying element (6), and two drying elements (6) are respectively arranged on both sides of the main plate (3).

10. The digital microphone with strong wind resistance, oil pollution resistance and high temperature resistance according to any one of claims 1 to 9, characterized in that: The film (501) is bonded and fixed to the bottom plate (103).

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