A low-frequency response buzzer

Abstract

This utility model relates to a low-frequency response buzzer, comprising: a housing, a protective cover, a piezoelectric buzzer element, and a bottom cover. A resonant cavity is formed within the housing. The buzzer element is disposed within the housing. The protective cover and bottom cover are respectively disposed at the upper and lower ends of the housing. A partition is provided in the middle of the housing, forming an upper resonant cavity and a lower resonant cavity. Multiple sound holes are provided in the middle of the partition. The outer diameter of the lower resonant cavity is smaller than that of the upper resonant cavity. The piezoelectric buzzer element is disposed within the lower resonant cavity, and the bottom cover is disposed at the bottom of the lower resonant cavity, sealing it. The protective cover is disposed on the upper opening of the upper resonant cavity, and multiple arc grooves are provided around the periphery of the protective cover. This utility model adopts a dual-resonant cavity structure, which is simple in structure and provides a low-frequency response buzzer with high sound pressure.

Description

Technical Field

[0001] This utility model relates to the field of buzzers, and in particular to a low-frequency response buzzer. Background Technology

[0002] Piezoelectric buzzers mainly utilize the inverse piezoelectric effect of piezoelectric ceramics, which is driven by electrical signals to convert into mechanical deformation, thereby driving air vibration and producing sound in conjunction with the sound-producing cavity, thus realizing the function of the device.

[0003] Piezoelectric buzzers used in audible and visual alarms need to respond in the low-frequency range while also aiming to increase sound pressure levels. However, the sound pressure levels of low-frequency response buzzers on the market are not high. Therefore, improving the sound pressure level of low-frequency response buzzers while controlling costs is a research area that buzzer products need to study. Summary of the Invention

[0004] In order to overcome at least one of the problems mentioned above, this utility model provides a low-frequency response buzzer with high sound pressure level.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a low-frequency response buzzer, including: a housing, a protective cover, a piezoelectric buzzer and a bottom cover, a resonance cavity is formed inside the housing, the buzzer is disposed inside the housing, and the protective cover and the bottom cover are respectively disposed at the upper and lower ends of the housing; A partition is provided in the middle of the housing, so that the resonating cavity forms an upper resonating cavity and a lower resonating cavity. Multiple sound holes are provided in the middle of the partition. The outer diameter of the lower resonating cavity is smaller than that of the upper resonating cavity. The piezoelectric buzzer is disposed in the lower resonating cavity, and the bottom cover is disposed at the bottom of the lower resonating cavity to close the lower resonating cavity. The protective cover is disposed on the upper opening of the upper resonating cavity, and multiple arc grooves are provided around the periphery of the protective cover.

[0006] Preferably, the sound holes are arranged in a circular pattern.

[0007] Preferably, the sound holes comprise five, arranged in a ring around the center of the partition.

[0008] Preferably, the partition has five circumferentially distributed sound holes and a centrally located sound hole.

[0009] Preferably, the housing is a one-piece injection molded structure.

[0010] Preferably, the circular arc grooves are evenly distributed in a ring around the periphery of the protective cover, forming a hollow groove sound outlet groove structure around the periphery of the protective cover.

[0011] Preferably, the piezoelectric buzzer has an electrode lead along its side, and the lower resonant cavity has a wire outlet notch on its side. After the bottom cover is installed, the electrode lead is pressed tightly.

[0012] Preferably, the piezoelectric buzzer is a steel buzzer.

[0013] The beneficial effects of this utility model are: the low-frequency response buzzer is equipped with two resonance cavities. The lower resonance cavity is designed with a sound hole arrangement to increase the number of sound holes. The circular arrangement enhances the sound amplification effect. After the sound wave is emitted from the lower resonance cavity, it enters the upper resonance cavity and undergoes secondary reflection and resonance in the upper resonance cavity to achieve the purpose of improving the sound. The shell structure of the upper and lower resonance cavities is an integral injection-molded double resonance cavity structure, which is simple in structure and saves costs. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of the low-frequency response buzzer described in this utility model; Figure 2 This is a utility model Figure 1 Another perspective illustration; Figure 3 This is a schematic diagram of the disassembled structure of the low-frequency response buzzer described in this utility model; Figure 4 This is a utility model Figure 3 Another perspective illustration.

[0016] Figure descriptions: 1. Housing, 11. Partition, 12. Sound hole, 13. Upper resonance cavity, 14. Lower resonance cavity, 2. Protective cover, 21. Arc groove, 3. Piezoelectric buzzer, 4. Bottom cover, 41. Snap-on position, 5. Electrode lead. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] like Figure 1 The low-frequency response buzzer shown has a dual resonant cavity, which can perform secondary reflection resonance to improve the sound. Its shell 1 is a one-piece injection molded dual resonant cavity structure, which is simple in structure and saves costs.

[0019] The low-frequency response buzzer in this embodiment consists of a housing 1, a protective cover 2, a piezoelectric buzzer 3, and a bottom cover 4. The piezoelectric buzzer 3 is disposed inside the housing 1, and the protective cover 2 and the bottom cover 4 are respectively disposed at the upper and lower ends of the housing 1. The housing 1 is an integral injection-molded structure. A partition 11 is provided in the middle of the housing 1, so that the resonance cavity forms an upper resonance cavity 13 and a lower resonance cavity 14. Multiple sound holes 12 are provided in the middle of the partition 11. The outer diameter of the lower resonance cavity 14 is smaller than the outer diameter of the upper resonance cavity 13. The piezoelectric buzzer 3 is disposed inside the lower resonance cavity 14, and the bottom cover 4 is disposed at the bottom of the lower resonance cavity 14, sealing the lower resonance cavity 14. The protective cover 2 is disposed on the upper opening of the upper resonance cavity 13, and multiple arc grooves 21 are provided around the periphery of the protective cover 2.

[0020] In one embodiment, the sound holes 12 are arranged in a circular pattern.

[0021] In one embodiment, the sound holes 12 comprise five holes, arranged in a ring around the center of the partition 11.

[0022] In one embodiment, the partition 11 has five circumferentially distributed sound holes 12 and a centrally located sound hole 12.

[0023] In this embodiment, the circular arc grooves 21 are evenly distributed in a ring around the periphery of the protective cover 2, forming a hollow groove structure for the sound outlet. The upper resonance cavity 13 has a recessed groove on its opening sidewall to allow the protective cover 2 to be inserted, either for locking or adhesive fixation.

[0024] In this embodiment, an electrode lead 5 is provided along the side edge of the piezoelectric buzzer 3, a wire outlet notch is provided on the side of the lower resonant cavity 14, and a protruding snap-fit ​​position 41 is provided on the edge of the bottom cover 4. After the bottom cover 4 is installed, the snap-fit ​​position 41 snaps into the wire outlet notch, tightly pressing the electrode lead 5. The bottom of the lower resonant cavity 14 has a recessed groove to allow the bottom cover 4 to be snapped in for locking or adhesive fixation.

[0025] In this embodiment, the piezoelectric buzzer 3 is a buzzer made of steel.

[0026] In this embodiment, the shell size is Φ46.6±0.5mm, the five surrounding sound holes are Φ2.3mm in size, and the central sound hole is Φ3.7mm.

[0027] The low-frequency response buzzer of this utility model has two resonating cavities. The lower resonating cavity is designed with a sound hole arrangement to increase the number of sound holes. The circular arrangement of the sound holes enhances the sound amplification effect. After the sound wave is emitted from the lower resonating cavity, it enters the upper resonating cavity and undergoes secondary reflection and resonance to improve the sound. The shell structure of the upper and lower resonating cavities is a single injection-molded double resonating cavity structure, which is simple in structure and saves costs.

[0028] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low frequency response buzzer characterized by, include: The enclosure comprises a housing, a protective cover, a piezoelectric buzzer, and a bottom cover. A resonant cavity is formed inside the housing. The buzzer is disposed inside the housing, and the protective cover and bottom cover are respectively disposed at the upper and lower ends of the housing. A partition is provided in the middle of the housing, so that the resonating cavity forms an upper resonating cavity and a lower resonating cavity. Multiple sound holes are provided in the middle of the partition. The outer diameter of the lower resonating cavity is smaller than that of the upper resonating cavity. The piezoelectric buzzer is disposed in the lower resonating cavity, and the bottom cover is disposed at the bottom of the lower resonating cavity to close the lower resonating cavity. The protective cover is disposed on the upper opening of the upper resonating cavity, and multiple arc grooves are provided around the periphery of the protective cover.

2. A low frequency response buzzer according to claim 1, characterized in that: The sound holes are arranged in a circular pattern.

3. A low frequency response buzzer according to claim 2, characterized in that: The sound holes comprise five, arranged in a ring around the center of the partition.

4. A low frequency response buzzer according to claim 2, wherein: The partition has five circularly distributed sound holes and one centrally located sound hole.

5. A low frequency response buzzer according to claim 1, characterized in that: The shell is a one-piece injection molded structure.

6. A low frequency response buzzer according to claim 1, characterized in that: The circular grooves are evenly distributed in a ring around the perimeter of the protective cover, forming a hollow groove structure for sound outlet holes around the perimeter of the protective cover.

7. A low frequency response buzzer according to claim 1, wherein: The piezoelectric buzzer has an electrode lead on its side, and the lower resonant cavity has a wire outlet notch on its side. After the bottom cover is installed, the electrode lead is pressed tightly.

8. A low-frequency response buzzer according to claim 7, characterized in that: The piezoelectric buzzer is made of steel.

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