A waterproof piezoelectric buzzer for an automobile and a manufacturing method thereof

Abstract

The present application relates to the technical field of automobile sound signal device, and more particularly to a waterproof piezoelectric buzzer for automobile and a manufacturing method thereof, comprising a shell body, a sound cavity arranged inside the shell body and a connector arranged at the bottom of the shell body, which are independently arranged and integrated by assembly; a main open port and a secondary open port for conducting sound are arranged on one side of the shell body, and a convex step part for preventing external water from entering the inside is arranged at the opening of the two ports; an upper cover for closing the sound cavity is arranged between the sound cavity and the inner wall of the shell body; a sound emitting port is arranged on the upper cover and extends with a flared cylinder part inside; an integrated port is further arranged on the bottom of the upper cover and is matched with the secondary open port, which conducts sound and discharges water in the sound cavity at the same time, and the present application improves the overall waterproof reliability and protection level, and improves the acoustic performance.

Description

Technical Field

[0001] This invention relates to the technical field of automotive sound signal devices, and more particularly to a waterproof piezoelectric buzzer for automobiles and its manufacturing method. Background Technology

[0002] Currently available buzzers require a sound-emitting hole to transmit sound waves and achieve the whistling effect. However, due to limitations in the installation and application environment, water often enters the buzzer through the sound-emitting hole and accumulates inside, causing poor insulation, oxidation of metal parts, and in severe cases, short circuits and functional failure.

[0003] A waterproof vehicle buzzer is disclosed in the existing patent publication number KR100757967B1. A protruding blocking part is set around the sound outlet to achieve surface drainage waterproofing. However, there is a gap in the assembly joint surface of the shell, which can easily cause leakage. In addition, the vibration plate coupling part, the base and the connector are integrally molded, which makes the mold complex and injection molding difficult. This integral structure also limits the assembly space of the piezoelectric plate, increasing the difficulty of installation.

[0004] Therefore, it is necessary to provide a waterproof piezoelectric buzzer for automobiles and a method for manufacturing the same, in order to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a waterproof piezoelectric buzzer for automobiles and its manufacturing method, which improves the overall waterproof reliability and protection level, while also enhancing acoustic performance.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a waterproof piezoelectric buzzer for automobiles, comprising a housing body, a sound cavity disposed inside the housing body, and a connector disposed at the bottom of the two, the three being independently disposed and assembled into a whole. The outer shell body has a main opening and a secondary opening on one side for conducting sound, and both openings are provided with raised steps to prevent external water from entering the interior. A cover is provided between the acoustic cavity and the inner wall of the outer shell to seal the acoustic cavity; The upper cover has a sound-emitting port that is connected to the main opening, and an expansion section extends from its inner side. The bottom of the upper cover is also provided with an integrated port that is compatible with the secondary opening. The integrated port conducts sound while draining water from the acoustic cavity.

[0007] As a preferred embodiment of the present invention, the diameter of the expansion cylinder is arranged to expand from the inside to the outside, and under the action of gravity, the outwardly inclined conical surface prevents external water from entering the acoustic cavity.

[0008] As a preferred embodiment of the present invention, an overflow groove for locking the top cover is provided on one side edge of the acoustic cavity; The upper cover has a ring-shaped part protruding at the end of the sound-emitting port away from the expansion cylinder, and its inner diameter is integrally extended and formed with the expansion cylinder. The annular portion protrudes and abuts against the inner wall of the outer shell body, fitting and connecting with the main opening.

[0009] As a preferred embodiment of the present invention, the bottom of the outer shell body is provided with an assembly opening, and guide grooves are provided on both sides inside. A sloping boss is fixedly connected to the top of the inner wall of the outer shell body; The acoustic cavity is inserted into the outer shell body along the guide groove, and the top of the acoustic cavity is guided to contact the inclined boss until it forms a limit, so that the acoustic cavity and the outer shell body are interference fit on one side.

[0010] As a preferred embodiment of the present invention, the connector includes an assembly platform, the size of which is adapted to the assembly port of the housing body, and they are interlocked by a snap-fit ​​structure. The bottom of the acoustic cavity is provided with a dovetail groove, and the acoustic cavity is snapped to one end of the assembly platform through the dovetail groove, and is snapped together by the second snap-fit ​​structure.

[0011] As a preferred embodiment of the present invention, the assembly platform has an open square groove and a through square opening on one side for engaging the first and second snap-fit ​​structures. One end of the open square groove extends to the side of the assembly platform.

[0012] As a preferred embodiment of the present invention, an elastic element is provided inside the open square groove; The elastic element applies a preload force between the side wall of the outer shell and the assembly platform, and simultaneously applies a preload force between the acoustic cavity and the assembly platform.

[0013] As a preferred embodiment of the present invention, the assembly platform is provided with PIN pins, a buzzer, and plug-in resistors; The top of the PIN pin is bent and slotted to initially clamp and fix one end of the wire that is connected to the buzzer chip. One side of the PIN pin is integrally formed with an extension portion, which is bent and slotted to initially clamp and fix the plug-in resistor.

[0014] This invention also provides a method for manufacturing a waterproof piezoelectric buzzer for automobiles, comprising the following steps: By fixing the top cover to the overflow groove on one side of the acoustic cavity with adhesive, the two are sealed together except for the sound outlet and the integration port. The buzzer chip is fixed to the circular mounting groove on one side of the acoustic cavity by applying adhesive. The acoustic cavity is snapped to one end of the assembly platform via a dovetail slide, and is also snapped together by the second snap-fit ​​structure. The plug-in resistor is installed in the extension section. The extension section is bent and slotted to initially clamp and fix the plug-in resistor. Install the wire connected to the buzzer chip on the top of the PIN pin, and initially clamp and fix one end of the connecting wire by bending and slotting. Solder the pre-fixed points of the plug-in resistor and the wire to achieve conductivity; The assembled acoustic cavity and connector are installed into the housing body. The guide groove guides the top of the acoustic cavity to contact the inclined boss until it forms a limit, so that the top cover and one side of the housing body are interference fit. Then, the connector and the housing body are interlocked by the snap-fit ​​structure. The annular part on the top cover protrudes and abuts against the inner wall of the outer shell, fitting snugly against the main opening to form a smooth sound outlet and prevent external water from entering the interior.

[0015] As a preferred embodiment of the present invention, when the acoustic cavity and connector are installed into the housing body, the elastic element is placed into the corresponding open square groove on the side of the assembly platform, and then the assembly is completed, so that the elastic element is subjected to pressure and a pre-tightening force is applied to the four sides.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The outer shell, the acoustic cavity, and the connector are independently set up, so that each component can be molded separately, which facilitates subsequent assembly. At the same time, the split structure facilitates the assembly of the buzzer, avoiding the situation where the connector pins would obstruct the installation of the buzzer when the connector and the acoustic cavity are integrated parts, thus reducing the assembly difficulty caused by spatial interference. By setting an independent top cover to seal the acoustic cavity, leaving only the opening for sound generation, water flow is prevented from entering except for the sound generation port. This enhances the sealing performance of the shell joints and avoids leakage problems caused by gaps in the assembly joints, thus ensuring the airtightness of the resonant cavity. Attached Figure Description

[0017] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the waterproof piezoelectric buzzer of the present invention; Figure 2 This is a front sectional view of the present invention; Figure 3 This is a cross-sectional schematic diagram of the expanded cylinder portion of the present invention; Figure 4 yes Figure 3 A magnified view of a portion of region A; Figure 5 This is a schematic cross-sectional view of the secondary opening of the present invention; Figure 6 This is a three-dimensional schematic diagram of the acoustic cavity of the present invention; Figure 7 This is a three-dimensional schematic diagram of the connector of the present invention; Figure 8 This is an exploded view of the structure of the present invention; Figure 9 This is a cross-sectional schematic diagram of the elastic element of the present invention; Figure 10 This is a three-dimensional schematic diagram of the elastic element of the present invention; In the diagram: 1. Outer shell body; 101. Main opening; 102. Secondary opening; 103. Guide groove; 104. Angled boss; 2. Acoustic cavity; 201. Top cover; 202. Expanding section; 203. Integration port; 204. Annular section; 3. Connector; 301. Assembly platform; 302. Protruding clamp; 303. Trapezoidal clamp one; 304. Trapezoidal clamp two; 305. Drainage groove; 4. PIN pins; 401. Buzzer; 402. Through-hole resistor; 403. Wires; 5. Extension section; 6. Open square groove; 601. Through square opening; 7. Elastic components; 8. Protruding block; 801. Water retaining wall. Detailed Implementation

[0019] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0020] Please see Figure 1-10 The present invention provides a technical solution: a waterproof piezoelectric buzzer for automobiles, comprising a housing body 1, a sound cavity 2 disposed inside the housing body 1, and a connector 3 disposed at the bottom of the two, the three being independently disposed and assembled into one unit. The outer shell body 1 has a main opening 101 and a secondary opening 102 on one side for conducting sound, and both openings are provided with raised steps to prevent external water from entering the interior. A cover 201 is provided between the acoustic cavity 2 and the inner wall of the outer shell 1 to seal the acoustic cavity 2; The upper cover 201 has a sound-emitting port that is connected to the main opening 101, and an expansion cylinder 202 extends from its inner side; The bottom of the top cover 201 is also provided with an integrated port 203 that is compatible with the secondary open port 102. The integrated port 203 conducts sound while draining water from the acoustic cavity 2.

[0021] Specifically, when the sound cavity 2 is working, the sound waves resonate inside the sound cavity 2 and are transmitted outward from the expansion cylinder 202 and the sound outlet. In addition, an integrated port 203 is provided at the bottom of the top cover 201 to assist in the transmission of some sound waves to the outside through the secondary open port 102 of the outer shell body 1. When there is water flow outside, the water will flow along the surface of the outer shell 1. The raised stepped part can initially prevent the water flow from the main opening 101 and the secondary opening 102. If a small amount of water enters the main opening 101 and seeps into the acoustic cavity 2, it can flow from the integrated port 203 to the secondary opening 102 and be discharged outside the buzzer. Preferably, an arc-shaped protrusion is provided at the bottom of the inner wall of the acoustic cavity 2, so as to guide the water entering the cavity to the low-lying areas at both ends of the acoustic cavity 2, and finally discharge it through the integrated port 203 to the secondary open port 102. Preferably, the raised stepped portion includes raised blocks 8 provided on the outer periphery of the main opening 101 and the secondary opening 102, so that water flows along the surface of the shell and bypasses the drain hole, thus playing the first waterproof role. Furthermore, the raised stepped portion also includes a water-blocking wall 801 disposed inside the raised block 8. When the water flow on the surface of the shell is large, the water flow along the surface of the raised block 8 will be blocked by the water-blocking wall 801, further preventing water from flowing into the cavity and achieving a double waterproofing effect. In this embodiment, the outer shell 1, the acoustic cavity 2, and the connector 3 are independently set up, so that each component can be molded separately, which facilitates subsequent assembly. At the same time, the separate structure facilitates the assembly of the buzzer, and avoids the situation where the connector 3 and the acoustic cavity 2 are an integral part, the pin of the connector 3 will not obstruct the installation of the buzzer, thus reducing the assembly difficulty caused by spatial interference. Furthermore, by setting an independent top cover 201 to seal the acoustic cavity 2, leaving only the opening for sound generation, water is prevented from flowing in except for the sound generation port, which enhances the sealing performance of the shell joint and avoids leakage problems caused by the gap of the assembly joint surface, so as to ensure the airtightness of the resonant cavity. Furthermore, by providing an expansion section 202 on the top cover 201, water flow into the interior can be further obstructed, forming a third waterproof structure. Moreover, this structure can also form a horn structure, which, together with the independently sealed top cover 201, further enhances the acoustic performance of the buzzer and strengthens the sound pressure output within a certain range. In other words, this structure achieves a simultaneous improvement in waterproof performance and sound pressure value.

[0022] Based on the above embodiment, the diameter of the expansion cylinder 202 is set to expand from the inside to the outside. Under the action of gravity, the outwardly inclined conical surface prevents external water from entering the acoustic cavity 2.

[0023] Specifically, the diameter of the expansion section 202 gradually increases towards the main opening 101, forming an annular conical surface. When water flows in from the main opening 101, it will come into contact with the conical surface and flow outward along the inclined surface under the action of gravity, and finally be discharged from the main opening 101. At the same time, the sound waves generated in the acoustic cavity 2 are guided by the conical surface and then transmitted outward from the main opening 101. In this embodiment, an expansion section 202 is provided, which makes it difficult for water to flow backward into the acoustic cavity 2 through the inclined conical surface. Furthermore, without changing the cavity volume and diaphragm parameters, the sound pressure output is improved. The structure is simple and highly reliable. Preferably, the conical expansion angle of the expansion section 202 is set to 30°~45°, and the ratio of the outer outlet diameter to the inner inlet diameter is 1.2~1.5. This parameter range can simultaneously take into account the gravity water blocking effect and the acoustic effect.

[0024] Based on the above embodiment, an overflow groove for locking the upper cover 201 is provided on one side edge of the acoustic cavity 2; The end of the upper cover 201 that is away from the sound outlet of the expansion cylinder 202 has a protruding annular part 204, and its inner diameter is integrally extended and formed with the expansion cylinder 202. The annular portion 204 protrudes and abuts against the inner wall of the outer shell body 1, fitting and engaging with the main opening 101.

[0025] Specifically, by setting an overflow groove, the top cover 201 can be easily snapped into place, and when it is glued and pressed into the acoustic cavity 2, the excess glue on the mating surface will spread into the overflow groove, thereby collecting the excess glue, forming a sealing glue layer, avoiding gaps, and improving the overall sealing performance. Furthermore, by setting an annular portion 204, the end face of which fits against the inner wall of the outer shell body 1, radial gaps are avoided at the mating point, which could lead to water seepage and sound leakage, thereby improving the sealing performance and acoustic transmission efficiency of the interface. Furthermore, the annular portion 204 and the expanding cylindrical portion 202 are integrally formed, and the internal channels are smooth, which ensures the continuity of acoustic transmission and reduces reflection loss during sound wave propagation. Furthermore, the axial height of the annular portion 204 is set to 0.8~1.0mm, which achieves an interference fit with the inner wall of the outer shell body 1 during assembly, and also generates a reaction force on the mating surface between the upper cover 201 and the overflow groove, further pressing and thereby enhancing the stability of the seal.

[0026] Based on the above embodiments, the bottom of the outer shell body 1 is provided with an assembly opening, and guide grooves 103 are provided on both sides inside; An inclined boss 104 is fixedly connected to the top of the inner wall of the outer shell body 1; The acoustic cavity 2 is inserted into the outer shell body 1 along the guide groove 103, and the top of the acoustic cavity 2 is guided to contact the inclined boss 104 until it is limited, so that the acoustic cavity 2 and the outer shell body 1 are interference fit.

[0027] In this embodiment, in order to avoid axial gap between the expanded cylinder 202 and the main opening 101 after assembly, which could lead to sound leakage or water seepage, the assembly is guided by the guide groove 103, and the inclined surface of the inclined boss 104 is used to gradually press it, which improves the consistency of the installation position of the acoustic cavity 2, ensures the coaxiality of the annular part 204 and the main opening 101, and thus improves the sealing and acoustic performance. Preferably, the guide groove 103 is provided on both sides of the inner wall of the outer shell body 1, with symmetrical protrusions and a 30° guide angle at the bottom entrance to facilitate assembly guidance.

[0028] Based on the above embodiments, the connector 3 includes an assembly platform 301, the size of which is adapted to the assembly port of the housing body 1, and they are interlocked by a snap-fit ​​structure. The bottom of the acoustic cavity 2 is provided with a dovetail groove. The acoustic cavity 2 is snapped to one end of the assembly platform 301 through the dovetail groove and is snapped to each other through the snap-fit ​​structure 2. The snap-fit ​​structure includes protruding snap-fit ​​pieces 302 disposed on both sides of the assembly platform 301 and corresponding snap-fit ​​slots disposed on the bottom of the outer shell body 1. The bottom of each snap-fit ​​slot is provided with an inclined snap-fit ​​surface. The protruding snap-fit ​​pieces 302 are displaced along the inclined snap-fit ​​surface, causing the protruding snap-fit ​​pieces 302 to undergo elastic deformation until they are snapped into the snap-fit ​​slots. The two snap-fit ​​each other to complete the assembly and fixation. The second snap-fit ​​structure includes a trapezoidal snap-fit ​​part 303 disposed on the surface of the assembly platform 301 and a through bottom groove disposed at the bottom of the acoustic cavity 2. The trapezoidal snap-fit ​​part 304 is provided with a protrusion at the center of the bottom groove. When the acoustic cavity 2 is slidably assembled along the dovetail slide, the trapezoidal snap-fit ​​part 303 moves along the through bottom groove. The trapezoidal snap-fit ​​part 303 and the inclined surface of the trapezoidal snap-fit ​​part 304 come into contact and avoid each other through deformation until the two are locked together to form a fixed structure. Several vertical drainage grooves 305 are provided at both ends of the assembly platform 301 to facilitate the drainage of water accumulated in the cavity from both sides.

[0029] Based on the above embodiments, an open square groove 6 and a through square opening 601 are provided on one side of the assembly platform 301 for engaging the first and second snap-fit ​​structures. One end of the open square groove 6 extends to the side of the assembly platform 301.

[0030] Specifically, the protruding clip 302 and the trapezoidal clip 303 are arranged adjacent to each other, so a pair of open square slots 6 are arranged on both sides of them to facilitate elastic deformation for snapping. In this embodiment, by providing an open square groove 6 and a through square opening 601 on one side of the protruding clip 302 and the trapezoidal clip 303, the local rigidity is reduced. Compared with the full wall thickness clip, this structure reduces the pressing force required for snapping without reducing the overall support strength of the assembly platform 301, thus preventing the parts from breaking during automated pressing and facilitating installation. Preferably, the inclined surfaces of trapezoidal clip 303 and trapezoidal clip 304 are set at 18°~20° and coated with a polytetrafluoroethylene coating to reduce the sliding assembly resistance.

[0031] Based on the above embodiments, an elastic element 7 is provided inside the open square groove 6; The elastic element 7 applies a pre-tightening force between the side wall of the outer shell 1 and the assembly platform 301, while simultaneously applying a pre-tightening force between the acoustic cavity 2 and the assembly platform 301. The elastic element 7 is set as an elastic sheet, which is S-shaped and has hook-shaped support parts extending in opposite directions at both ends. It is convenient to support both ends and does not require any additional fixing structure. The opening end of the opening square groove 6 is closed by the assembly of the outer shell body 1, so that the elastic sheet is subjected to the clamping force at both ends inside. The bending structure of the elastic sheet further converts the force into the pre-tightening force on both sides in the vertical direction, thereby achieving pre-tightening on all four sides and avoiding gaps in the assembly structure caused by long-term vibration of the car. The hook-shaped support of the elastic piece facing the opening side of the opening square groove 6 is placed downwards, so that its arc-shaped bending section is set upwards. During assembly, the opening edge of the outer shell body 1 slides along the arc-shaped bending section until the assembly is completed. This avoids the outer shell body 1 and the hook-shaped support from interfering with each other and getting stuck during assembly. The structure is simple and there is no need to specially open the elastic piece placement groove, making assembly convenient. Preferably, the elastic sheet has several through holes. Without changing the outer dimensions of the elastic sheet, the preload stiffness can be finely adjusted by adjusting the hole diameter to adapt to application scenarios with different vibration levels.

[0032] Specifically, the elastic element 7 is placed inside the open square groove 6, with its hook-shaped support at one end facing downwards and its arc-shaped bent section facing upwards (e.g., Figure 9As shown), while the outer shell body 1 is assembled, the side opening of the square groove 6 is closed, forming a lateral limit on the elastic element 7. The bending structure of the elastic element 7 is deformed under pressure, and a pre-tightening force is applied simultaneously between the side wall of the outer shell body 1 and the assembly platform 301, and between the acoustic cavity 2 and the assembly platform 301. In this embodiment, since three independent separate components are provided, in order to ensure the connection stability after assembly, the S-shaped elastic element 7 realizes the linkage pre-tightening of the three independent components. Its bending structure can convert the lateral assembly pressure into the vertical support force, eliminate the mating gap of the dovetail slide groove assembly surface, further enhance the fixing stability of the three components, and the limiting reliability is higher than that of the traditional passive buckle limiting, which solves the problem that the split structure is prone to gaps and abnormal noises under long-term vehicle vibration. Furthermore, the elastic element 7 is naturally limited by the open square groove 6 and the outer shell wall, without the need for additional screws or glue fixation, saving costs. Moreover, the open square groove 6 not only serves as the cavity of the spring piece, but also achieves local thinning, thereby releasing the snap-fit ​​stress and preventing the plastic parts from cracking and being damaged under the pure rigid snap-fit ​​action. The structure is simplified and stress concentration is avoided. Furthermore, the hook-shaped support of the elastic element 7 is positioned downwards and the arc-shaped section is positioned upwards, so that when the outer shell body 1 is pushed into the assembly, the edge can smoothly transition along the arc surface of the elastic element 7, avoiding collision or jamming problems and improving assembly convenience. Preferably, the elastic element 7 is made of stainless steel with a thickness of 0.15~0.25mm. Stainless steel has high fatigue strength and corrosion resistance, ensuring service life. Preferably, the perforated holes are symmetrically distributed along the bending axis of the elastic element 7, and the hole shape is an elongated oval hole, so as to adjust the bending stiffness and avoid excessive stress concentration at the bending point, thereby extending the service life of the spring sheet. Preferably, a rolled cylindrical edge structure is provided at the edge of the hook-shaped support to prevent the edge of the metal spring sheet from getting stuck in the assembly gap during the stress process.

[0033] Based on the above embodiments, the assembly platform 301 is provided with PIN pin 4, buzzer 401, and plug-in resistor 402; The top of the PIN pin 4 is bent and slotted to initially clamp and fix one end of the wire 403 that is connected to the buzzer 401. One side of the PIN pin 4 is integrally formed with an extension 5. The extension 5 is bent and slotted to initially clamp and fix the plug-in resistor 402.

[0034] Existing technologies typically require an additional PCB board to carry resistors and facilitate wire transfer. In this embodiment, the plug-in resistor 402 and wire 403 are directly clamped by the PIN pin 4 and its integrally formed extension 5, eliminating the need for a circuit board assembly. Electrical interconnection is completed within a limited housing space, resulting in a compact structure and reduced costs. Furthermore, through the bending and slotting structure of the extension 5 and the top of the PIN pin 4, the resistor pin and wire are mechanically pre-positioned. Compared with manual soldering, the pre-clamping can ensure that the component will not be displaced due to flux evaporation or heat during the subsequent automatic soldering process, and the clamping point can absorb some vibration stress to prevent fatigue cracking caused by direct force on the solder joint. Preferably, the inside of the slot at the top of the extension 5 and the PIN pin 4 is provided with a V-shaped narrow opening, which can clamp resistor pins or wires of different tolerance diameters to ensure that they are firmly fixed.

[0035] This embodiment also provides a method for manufacturing a waterproof piezoelectric buzzer for automobiles, including the following steps: S1. By fixing the top cover 201 to the overflow groove on one side of the acoustic cavity 2 with adhesive, the two are sealed together except for the sound outlet and the integrated port 203. S2. Fix the buzzer 401 to the circular mounting groove on one side of the acoustic cavity 2 by applying adhesive; S3, the acoustic cavity 2 is snapped to one end of the assembly platform 301 by a dovetail slide, and is snapped to each other by the snap-fit ​​structure two; S4. Install the plug-in resistor 402 into the extension 5. By bending and slotting the extension 5, the plug-in resistor 402 is initially clamped and fixed. S5. Install the wire 403 connected to the buzzer 401 on the top of the PIN pin 4, and initially clamp and fix one end of the connecting wire 403 by bending and slotting. S6. Solder the pre-fixed points of plug-in resistor 402 and wire 403 to achieve conductivity; S7. The assembled acoustic cavity 2 and connector 3 are installed into the outer shell 1. The guide groove 103 guides the top of the acoustic cavity 2 to contact the inclined boss 104 until a limit is formed, so that the upper cover 201 and one side of the outer shell 1 are interference fit. Then, the connector 3 and the outer shell 1 are interlocked by the snap-fit ​​structure. S8. The annular portion 204 on the top cover 201 protrudes and abuts against the inner wall of the outer shell body 1, fitting and connecting with the main opening 101 to form a smooth sound outlet and prevent external water from entering the interior.

[0036] In this embodiment, by bending and slotting the extension 5 and the PIN pin 4, a clamping force is formed on its own, completely eliminating the need for a secondary clamp, simplifying the operation, ensuring the consistency of the solder joints, and improving assembly efficiency. Furthermore, a guide groove 103 is provided for guidance, which, together with the inclined boss 104, generates a component force perpendicular to the insertion direction, so that the upper cover 201 and the outer shell body 1 form an interference fit. This progressive assembly of guidance, compression and snap-fit ​​improves the ease of assembly and ensures the coaxiality of the sound outlet. Furthermore, by abutting the annular portion 204 against the main opening 101, an end-face sealing structure is formed, which can achieve a butt seal at the same time as the assembly is completed, without the need for additional steps or processes.

[0037] In step S7, when the acoustic cavity 2 and connector 3 are installed into the outer shell body 1, the elastic element 7 is placed into the open square groove 6 on the side of the assembly platform 301, and then the assembly is completed, so that the elastic element 7 is subjected to pressure and a pre-tightening force is applied to the four sides.

[0038] Specifically, the elastic element 7 is placed in the open square groove 6. As the assembly platform 301 and the acoustic cavity 2 are pushed into the outer shell body 1 as a whole, the inner wall of the outer shell body 1 gradually closes the opening end of the open square groove 6 and squeezes the hook-shaped support of the elastic element 7. The S-shaped bending structure undergoes elastic deformation under lateral compression, forming a four-way force state. In this embodiment, the open square groove 6 of the assembly platform 301 is directly used as a cavity, and the pre-tightening force can be triggered at the same time as assembly, achieving four-way limiting without adding additional fastening parts; Furthermore, during assembly, the elastic element 7 can be directly placed into the open square groove 6 without any additional fixing process. Only the subsequent assembly and snap-fit ​​can be completed to limit and fix the elastic element 7. This makes reasonable use of the assembly process steps of the buzzer in this application, which is highly practical.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection, the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0040] The above provides a detailed description of a waterproof piezoelectric buzzer for automobiles and its manufacturing method, as provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A waterproof piezoelectric buzzer for automobiles, characterized in that, It includes an outer shell, a sound cavity disposed inside the outer shell, and a connector disposed at the bottom of both. The three are independently disposed and assembled into a whole. The outer shell body has a main opening and a secondary opening on one side for conducting sound, and both openings are provided with raised steps to prevent external water from entering the interior. A cover is provided between the acoustic cavity and the inner wall of the outer shell to seal the acoustic cavity; The upper cover has a sound-emitting port that is connected to the main opening, and an expansion section extends from its inner side. The bottom of the upper cover is also provided with an integrated port that is adapted to the secondary opening. The integrated port conducts sound while draining water from the acoustic cavity. The connector includes an assembly platform, one side of which has an open square groove and a through square opening for engaging the first and second snap-fit ​​structures. One end of the open square groove extends to the side end of the assembly platform; An elastic element is provided inside the open square groove; The elastic element applies a preload force between the side wall of the outer shell and the assembly platform, and simultaneously applies a preload force between the acoustic cavity and the assembly platform. The bottom of the outer shell body is provided with an assembly opening, and guide grooves are provided on both sides inside; A sloping boss is fixedly connected to the top of the inner wall of the outer shell body; The acoustic cavity is inserted into the outer shell body along the guide groove, and the top of the acoustic cavity is guided to contact the inclined boss until a limit is formed, so that the acoustic cavity and the outer shell body are interference fit on one side. The dimensions of the assembly platform are adapted to the assembly port of the outer shell body, and they are interlocked by a snap-fit ​​structure. The bottom of the acoustic cavity is provided with a dovetail groove, and the acoustic cavity is snapped to one end of the assembly platform through the dovetail groove, and is snapped together by the second snap-fit ​​structure.

2. The waterproof piezoelectric buzzer for automobiles according to claim 1, characterized in that, The diameter of the expansion section is set to expand from the inside to the outside. Under the action of gravity, the outwardly inclined conical surface prevents external water from entering the acoustic cavity.

3. The waterproof piezoelectric buzzer for automobiles according to claim 1, characterized in that, An overflow groove for locking the top cover is provided on one side edge of the acoustic cavity; The upper cover has a ring-shaped part protruding at the end of the sound-emitting port away from the expansion cylinder, and its inner diameter is integrally extended and formed with the expansion cylinder. The annular portion protrudes and abuts against the inner wall of the outer shell body, fitting and connecting with the main opening.

4. A waterproof piezoelectric buzzer for automobiles according to claim 1, characterized in that, The assembly platform is equipped with PIN pins, a buzzer, and plug-in resistors. The top of the PIN pin is bent and slotted to initially clamp and fix one end of the wire that is connected to the buzzer chip. One side of the PIN pin is integrally formed with an extension portion, which is bent and slotted to initially clamp and fix the plug-in resistor.

5. A method for manufacturing a waterproof piezoelectric buzzer for automobiles, used in the waterproof piezoelectric buzzer for automobiles as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. By applying adhesive to fix the top cover to the overflow groove on one side of the acoustic cavity, the two are sealed together except for the sound outlet and the integration port. S2. Fix the buzzer chip to the circular mounting groove on one side of the acoustic cavity by applying adhesive; S3. The acoustic cavity is snapped to one end of the assembly platform by a dovetail slide, and is also snapped together by the second snap-fit ​​structure. S4. Install the plug-in resistor into the extension section, and use the extension section to bend and slot to initially clamp and fix the plug-in resistor. S5. Install the wire connected to the buzzer chip on the top of the PIN pin, and initially clamp and fix one end of the connecting wire by bending and slotting. S6. Solder the pre-fixed points of the plug-in resistor and the wire to achieve conductivity; S7. Insert the assembled acoustic cavity and connector into the housing body. The guide groove guides the top of the acoustic cavity to contact the inclined boss until it forms a limit, so that the top cover and one side of the housing body are interference fit. Then, the connector and the housing body are interlocked by the snap-fit ​​structure. S8. The annular part on the top cover protrudes and abuts against the inner wall of the outer shell body, fitting snugly against the main opening to form a smooth sound outlet and prevent external water from entering the interior.

6. The method for manufacturing a waterproof piezoelectric buzzer for automobiles according to claim 5, characterized in that, In step S7, when the acoustic cavity and connector are installed into the housing body, the elastic element is placed into the corresponding open square groove on the side of the assembly platform, and then the assembly is completed, so that the elastic element is subjected to pressure and a pre-tightening force is applied to the four sides.

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