buzzer

Abstract

The utility model discloses a buzzer, comprising: a shell, wherein the shell has at least one resonance cavity, and the top end of the inner wall of the shell is provided with a mounting step portion; a buzzer plate, wherein the buzzer plate is installed inside the shell and is arranged in a close fit with the annular step portion; a cover body, wherein the cover body is clamped inside the shell, and the bottom end of the cover body abuts against the buzzer plate, and the left and right sides of the cover body are respectively provided with accommodating through holes; and a guide pin, wherein two guide pins are respectively fixed to the accommodating through holes on the left and right sides of the cover body; by arranging the mounting step portion at the top end of the inner wall of the shell, the bottom surface of the buzzer plate is arranged in a close fit with the mounting step portion, and the cover body tightly presses the top surface of the buzzer plate, so that a closed space is formed between the buzzer plate and the cover body, and salt spray mist cannot enter into the cover body, thereby effectively improving the sealing performance of the buzzer, enabling it to undergo a salt spray test, and ensuring the yield of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of buzzers, in particular to a buzzer. Background Art

[0002] The buzzer is an electronic sounder with an integrated structure, powered by DC voltage, and is widely used as a sound-generating device in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, etc.; while the SMD buzzer usually turns the connecting wire into a welding piece and is integrated with the base to facilitate the welding of the buzzer on the circuit board.

[0003] At present, in the buzzer use industry, users have increasingly stringent requirements for products, and the verification time required in the salt spray test has increased significantly; however, since the buzzer in the prior art does not form a good sealing condition, the buzzer cannot achieve the effect of isolating the salt spray intrusion during the long-term salt spray test, resulting in a decrease in product yield. Therefore, it is necessary to design a buzzer to overcome the defect that the buzzer in the prior art cannot isolate the salt spray intrusion. Utility Model Content

[0004] The purpose of the utility model is to provide a buzzer, which can improve the sealing condition of the buzzer to isolate the intrusion of salt mist and improve the product yield. To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A buzzer comprises: a shell, the shell having at least one resonance cavity, the top of the inner wall of the shell being provided with a mounting step portion; a buzzer plate, the buzzer plate being installed inside the shell and being arranged in a close fit with the annular step portion; a cover body, the cover body being snap-fitted to the inside of the shell, the bottom end of the cover body being in contact with the buzzer plate, and the left and right sides of the cover body being respectively provided with accommodating through holes; and a guide pin, two of the guide pins being respectively fixed to the accommodating through holes on the left and right sides of the cover body.

[0006] In some possible implementations, a first annular limiting portion is disposed at the top end of the shell, and the top end of the cover body abuts against the first annular limiting portion.

[0007] In some possible embodiments, a second annular limiting portion is provided at the top of the cover body, and the inner diameter of the second annular limiting portion is arranged to increase from bottom to top, wherein the inner diameter of the bottom end of the second annular limiting portion is smaller than the inner diameter of the first annular limiting portion, and the inner diameter of the top end of the second annular limiting portion is larger than the inner diameter of the first annular limiting portion.

[0008] In some possible implementations, a sound producing hole is disposed at the bottom end of the shell.

[0009] In some possible implementations, an annular limiting protrusion is provided at the bottom of the inner wall of the shell, and the inner ring of the annular limiting protrusion is provided along the sounding hole.

[0010] In some possible embodiments, a pin is provided at one end of the guide needle, and the pin passes through the cover body. A connecting spring is provided at the other end of the guide needle, and one end of the connecting spring is connected to the guide needle. The other end of the connecting spring is bent to form a contact pressure spring. A contact pressure bump is provided at the end of the contact pressure spring, and the contact pressure bump is crimped to the buzzer.

[0011] In some possible implementations, the buzzer sheet includes a ceramic sheet and a substrate, and the number of the guide needles is two, wherein the contact pressure protrusion of one guide needle contacts the ceramic sheet, and the contact pressure protrusion of the other guide needle contacts the substrate.

[0012] In some possible implementations, a buffer column is disposed on the top of the cover body, and the buffer column is a cylindrical, square, elliptical or triangular column structure.

[0013] Beneficial effects of the utility model:

[0014] The utility model provides a buzzer sheet, which is provided with a mounting step portion at the top end of the inner wall of a shell, and the bottom surface of the buzzer sheet is fitted on the mounting step portion, and a cover body tightly presses the top surface of the buzzer sheet, so that a closed space is formed between the buzzer sheet and the cover body, and salt spray mist cannot enter into the cover body, thereby effectively improving the sealing of the buzzer, enabling it to pass the salt spray test and ensuring the yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of a buzzer provided by a specific embodiment of the utility model;

[0016] Figure 2 yes Figure 1 Sectional view along AA.

[0017] In the figure:

[0018] 1. Shell; 11. Resonance cavity; 12. Mounting step;

[0019] 13. First annular limiting portion; 14. Sounding hole; 15. Annular limiting protrusion;

[0020] 2. buzzer; 3. cover; 31. second annular limiting portion;

[0021] 32. Buffer column; 4. Guide pin; 41. Pin;

[0022] 42. Connecting spring piece; 43. Contact spring piece; 44. Contact convex point. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides a buzzer, including a shell 1, a buzzer plate 2, a cover body 3 and a guide pin 4. The shell 1 has at least one resonance cavity 11, and a mounting step portion 12 is provided at the top of the inner wall of the shell 1. The buzzer plate 2 is installed inside the shell 1 and is fitted with the annular step portion. The cover body 3 is snapped into the inside of the shell 1, and the bottom end of the cover body 3 abuts against the buzzer plate 2, and the left and right sides of the cover body 3 are respectively provided with accommodating through holes. Two guide pins 4 are respectively fixed to the accommodating through holes on the left and right sides of the cover body 3.

[0027] The utility model sets a mounting step portion 12 at the top of the inner wall of the shell 1, and the bottom surface of the buzzer 2 is fitted on the mounting step portion 12, and the cover body 3 tightly squeezes the top surface of the buzzer 2, so that a closed space is formed between the buzzer 2 and the cover body 3, and salt spray mist cannot enter the cover body 3, which effectively improves the sealing of the buzzer, enables it to pass the salt spray test, and ensures the yield of the product.

[0028] For example, Figure 2 As shown, the top of the housing 1 is provided with a first annular limiting portion 13, and the top of the cover body 3 abuts against the first annular limiting portion 13. Further, the top of the cover body 3 is provided with a second annular limiting portion 31, and the inner diameter of the second annular limiting portion 31 is increased from bottom to top, wherein the inner diameter of the bottom end of the second annular limiting portion 31 is smaller than the inner diameter of the first annular limiting portion 13, and the inner diameter of the top end of the second annular limiting portion 31 is larger than the inner diameter of the first annular limiting portion 13. It should be noted that both the shell and the cover 3 are made of plastic material. When the cover 3 is installed to the shell, the second annular limiting portion 31 moves into the resonance cavity 11. Under the action of the outer wall of the second annular limiting portion 31, the first annular limiting portion 13 produces elastic deformation until the second annular limiting portion 31 is completely placed in the resonance cavity 11. The first annular limiting portion 13 returns to its original state to limit the movement range of the cover 3. This design makes it unnecessary to add glue when connecting the cover 3 and the shell, and enables the cover 3 to press the buzzer piece 2 tightly, which not only improves the installation efficiency, but also improves the sealing of the product.

[0029] Furthermore, there is no bevel at the junction of the cover body 3 and the buzzer plate 2, and the bottom end of the cover body 3 is adapted to form a fitting surface with the top end of the buzzer plate 2 to prevent salt mist from squeezing out from the gap.

[0030] like Figure 2 As shown, a sound hole 14 is provided at the bottom end of the housing 1. Exemplarily, an annular limiting protrusion 15 is provided at the bottom of the inner wall of the housing 1, and the inner ring of the annular limiting protrusion 15 is provided along the sound hole 14. The cross section of the annular limiting protrusion 15 is a circular ring, and the vibration amplitude of the buzzer 2 is effectively limited by the annular limiting protrusion 15, ensuring that the buzzer 2 vibrates within a reasonable amplitude.

[0031] For example, Figure 1 and Figure 2 As shown, one end of the guide needle 4 is provided with a pin 41, and the pin 41 passes through the cover body 3. The other end of the guide needle 4 is provided with a connecting spring 42. One end of the connecting spring 42 is connected to the guide needle 4, and the other end of the connecting spring 42 is bent to form a contact spring 43. The end of the contact spring 43 is provided with a contact protrusion 44, and the contact protrusion 44 is crimped to the buzzer 2.

[0032] Specifically, the buzzer 2 includes a ceramic sheet and a substrate, and the number of guide pins 4 is two, wherein the contact convex point 44 of one guide pin 4 contacts the ceramic sheet, and the contact convex point 44 of the other guide pin 4 contacts the substrate. Furthermore, the two guide pins 4 are respectively a long patch guide pin 4 and a short patch guide pin 4, wherein the contact convex point of the long patch pin contacts the ceramic sheet, and the contact convex point of the short patch guide pin 4 contacts the substrate. By the long patch pin contacting the ceramic sheet, the pressure of the buzzer 2 is exerted, the vibration amplitude is increased to achieve a high sound pressure effect, and the short patch guide pin 4 contacts the substrate to achieve a proximal fixed compression effect.

[0033] Exemplarily, a buffer column 32 is disposed at the top of the cover body 3, and the buffer column 32 is a cylindrical, square, elliptical or triangular column structure.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A buzzer, characterized in that: include: A housing, wherein the housing has at least one resonance cavity, and a mounting step portion is provided at the top end of an inner wall of the housing; A buzzer, the buzzer is installed inside the shell and is fitted with the installation step; a cover, the cover is snapped into the inside of the shell, and the bottom end of the cover is in contact with the buzzer, the bottom end of the cover is adapted to form a fitting surface with the top end of the buzzer, and the left and right sides of the cover are respectively provided with accommodating through holes; guide pins, the two guide pins are respectively fixed to the accommodating through holes on the left and right sides of the cover; A first annular limiting portion is arranged at the top of the shell, and the top of the cover body abuts against the first annular limiting portion; a second annular limiting portion is arranged at the top of the cover body, and the inner diameter of the second annular limiting portion is arranged to increase from bottom to top, wherein the inner diameter of the bottom end of the second annular limiting portion is smaller than the inner diameter of the first annular limiting portion, and the inner diameter of the top end of the second annular limiting portion is larger than the inner diameter of the first annular limiting portion, and the shell and the cover body are both made of plastic material; a sound hole is arranged at the bottom end of the shell; an annular limiting protrusion is arranged at the bottom of the inner wall of the shell, and the inner ring of the annular limiting protrusion is arranged along the sound hole.

2. The buzzer according to claim 1, characterized in that: A pin is provided at one end of the guide needle, and the pin passes through the cover body. A connecting spring is provided at the other end of the guide needle. One end of the connecting spring is connected to the guide needle, and the other end of the connecting spring is bent to form a contact pressure spring. A contact pressure convex point is provided at the end of the contact pressure spring, and the contact pressure convex point is crimped to the buzzer.

3. The buzzer according to claim 2, characterized in that: The buzzer sheet comprises a ceramic sheet and a substrate. The number of the guide pins is two, wherein the contact and pressure convex point of one guide pin contacts the ceramic sheet, and the contact and pressure convex point of the other guide pin contacts the substrate.

4. The buzzer according to claim 1, characterized in that: A buffer column is arranged on the top of the cover body, and the buffer column is a cylindrical, square, elliptical or triangular column structure.

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