Piezoelectric active buzzer

Abstract

The utility model relates to a piezoelectric active buzzer, which comprises a buzzer body (12). A plurality of sound transmission holes (22) are evenly formed in the side wall of the blocking shell (21) in the circumferential direction, the sound transmission holes (22) are obliquely formed from the center of the blocking shell (21) to the edge of the blocking shell (21) from top to bottom, and cleaning rotating plates (31) are arranged in the sound transmission holes (22); when the buzzer is used, sound is emitted from the inside of the sound outlet hole (11) in the top of the buzzer body (12), the sound is transmitted to the sound transmission hole (22) through the first cambered surface (23) and the second cambered surface (24) and is transmitted out, the blocking shell (21) and the sound transmission hole (22) which is obliquely arranged can block and reduce dust and sundries from entering the buzzer body (12) respectively, and in addition, the sound transmission hole (22) is cleaned by periodically rotating the cleaning rotating plate (31), so that the sound transmission effect is improved. The internal elements of the buzzer body (12) are further prevented from being broken down, and the service life is prolonged.

Description

Technical Field

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

[0002] A 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. A piezoelectric active buzzer is an electronic sound-generating element that uses the piezoelectric effect of a piezoelectric ceramic buzzer. It has the advantages of low power consumption, low cost, high reliability, resistance to harsh working environments, and resistance to electromagnetic interference. Therefore, it is widely used in household appliances, machinery and equipment, vehicle anti-theft, home security and other working fields. An existing piezoelectric active buzzer. The sound outlet of the piezoelectric buzzer on the market is usually exposed on the upper surface of the shell, and dust and debris can easily enter the shell from the sound outlet, causing failure of the internal components of the buzzer and reducing its service life. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the sound outlet of the existing piezoelectric buzzer is usually exposed on the upper surface of the shell, and dust and debris can easily enter the shell through the sound outlet, thereby causing malfunction of the internal components of the buzzer and reducing the service life.

[0004] In order to solve the above problems, the utility model provides a piezoelectric active buzzer, including a buzzer body with a sound outlet hole on the top, a baffle shell on the top of the buzzer body, a plurality of sound holes evenly opened circumferentially on the side wall of the baffle shell, the sound holes are inclined from top to bottom and from the center of the baffle shell to its edge, the upper surface of the interior of the baffle shell is formed by connecting a first arc surface and a second arc surface, the second arc surface is tangent to the upper edge line of the sound hole, and a cleaning rotating plate is provided in the sound hole.

[0005] The piezoelectric active buzzer provided by the utility model also has the following technical features:

[0006] A vertical hole is opened in the center of the baffle shell, and an adjusting shaft is rotatably arranged in the vertical hole. The lower end of the adjusting shaft is fixed to the active bevel gear, and the active bevel gear is meshed with multiple driven bevel gears at the same time. The driven bevel gear is fixed to one end of the rotating shaft, and the other end of the rotating shaft passes through the baffle shell and is fixed to the cleaning rotating plate.

[0007] The cleaning rotating plate is a spiral plate body.

[0008] A knob is fixed on the upper end of the adjusting shaft, and an anti-slip groove is provided on the outer surface of the knob.

[0009] The first arc surface protrudes downward, the second arc surface protrudes upward, the inner side of the second arc surface is tangently connected to the outer side of the first arc surface, and the outer side of the second arc surface is tangently arranged to the upper edge line of the sound-transmitting hole.

[0010] The top of the buzzer body is connected to the retaining shell through threads.

[0011] The bottom of the buzzer body is provided with pins.

[0012] The utility model has the following beneficial effects: sound is emitted from the sound outlet hole on the top of the buzzer body, and is transmitted to the sound-transmitting hole through the first arc surface and the second arc surface; the baffle shell and the obliquely arranged sound-transmitting hole can respectively block and reduce dust and debris from entering the interior of the buzzer body; in addition, the sound-transmitting hole can be cleaned by regularly rotating the cleaning rotating plate, thereby further avoiding malfunction of the internal components of the buzzer body and prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional view of the side view of the utility model;

[0014] Figure 2 A partial cross-sectional view of the baffle housing. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0016] like Figure 1 to Figure 2 As shown, the piezoelectric active buzzer of the utility model includes a buzzer body 12 with a sound outlet hole 11 on the top, a baffle shell 21 is provided on the top of the buzzer body 12, and a plurality of sound holes 22 are evenly provided on the side wall of the baffle shell 21 in a circumferential direction. The sound holes 22 are inclined from top to bottom and from the center of the baffle shell 21 to its edge. The upper surface inside the baffle shell 21 is formed by connecting a first arc surface 23 and a second arc surface 24. The second arc surface 24 is tangent to the upper edge line of the sound hole 22, and a cleaning rotating plate 31 is provided in the sound hole 22.

[0017] The sound is emitted from the sound outlet 11 at the top of the buzzer body 12, and is transmitted to the sound hole 22 through the first curved surface 23 and the second curved surface 24. The blocking shell 21 and the inclined sound hole 22 can respectively block and reduce the dust and debris from entering the interior of the buzzer body 12. In addition, the sound hole 22 can be cleaned by regularly rotating the cleaning turn plate 31, so as to further avoid malfunction of the internal components of the buzzer body 12 and increase the service life.

[0018] The upper surface inside the baffle shell 21 is a smooth surface to reduce the loss of sound transmission.

[0019] Wherein, the number of the sound-transmitting holes 22 is less than or equal to 4.

[0020] Preferably, a vertical hole 32 is opened at the center of the baffle shell 21, and an adjusting shaft 33 is rotatably arranged in the vertical hole 32. The lower end of the adjusting shaft 33 is fixed to the driving bevel gear 34, and the driving bevel gear 34 is simultaneously engaged with multiple driven bevel gears 35. The driven bevel gear 35 is fixed to one end of the rotating shaft 36, and the other end of the rotating shaft 36 passes through the baffle shell 21 and is fixed to the cleaning rotating plate 31.

[0021] By rotating the adjusting shaft 33 , the driving bevel gear 34 and the driven bevel gear 35 are driven to rotate, and the cleaning rotating plate 31 is driven by the rotating shaft 36 to rotate and scrape the inner wall of the sound transmission hole 22 , thereby cleaning the dust and debris in the sound transmission hole 22 .

[0022] A slot body 37 communicating with the vertical hole 32 is provided in the retaining housing 21 , and a driving bevel gear 34 and a plurality of driven bevel gears 35 are provided in the slot body 37 .

[0023] The rotating shaft 36 is rotatably connected to the retaining housing 21 .

[0024] Preferably, the cleaning rotating plate 31 is a spiral plate.

[0025] The dust and debris in the sound transmission hole 22 can be cleaned out by rotating the spiral cleaning rotating plate 31 .

[0026] Preferably, a knob 38 is fixed to the upper end of the adjusting shaft 33 , and an anti-slip groove is formed on the outer surface of the knob 38 .

[0027] Preferably, the first arc surface 23 bulges downward, the second arc surface 24 bulges upward, the inner side of the second arc surface 24 is tangent to the outer side of the first arc surface 23 , and the outer side of the second arc surface 24 is tangent to the upper edge of the sound hole 22 .

[0028] The sound is emitted from the sound outlet 11 at the top of the buzzer body 12 and smoothly transmitted to the sound transmission hole 22 through the downwardly convex first arc surface 23 and the upwardly convex second arc surface 24, thereby reducing the volume loss.

[0029] Among them, the upper surface of the outer part of the retaining shell 21 is an upwardly protruding arc surface, so that dust and debris can slide down along the arc surface. Of course, the upwardly protruding arc surface can also extend to the edge so that the retaining shell 21 forms an umbrella-like structure, further blocking and reducing dust and debris from entering the interior of the buzzer body 12.

[0030] Preferably, the top of the buzzer body 12 is connected to the retaining shell 21 via threads.

[0031] Preferably, a pin 13 is provided at the bottom of the buzzer body 12 .

[0032] The working principle of the utility model is as follows:

[0033] The sound is emitted from the sound outlet 11 at the top of the buzzer body 12, and is smoothly transmitted to the sound-transmitting hole 22 through the downwardly convex first arc surface 23 and the upwardly convex second arc surface 24, thereby reducing the volume loss; the blocking shell 21 and the inclined sound-transmitting hole 22 can respectively block and reduce the dust and debris from entering the buzzer body 12;

[0034] In addition, by regularly rotating the knob 38 and the adjustment shaft 33, the active bevel gear 34 and the driven bevel gear 35 are meshed and transmitted, and the cleaning rotating plate 31 is driven by the rotating shaft 36 to scrape the inner wall of the sound hole 22 in a rotating form, thereby cleaning out the dust and debris in the sound hole 22, further avoiding malfunction of the internal components of the buzzer body 12 and improving the service life.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A piezoelectric active buzzer, comprising a buzzer body (12) with a sound outlet hole (11) at the top, characterized in that: A baffle (21) is provided on the top of the buzzer body (12), and a plurality of sound-transmitting holes (22) are uniformly opened on the side wall of the baffle (21) in a circumferential direction. The sound-transmitting holes (22) are arranged obliquely from top to bottom and from the center of the baffle (21) to the edge thereof. The upper surface inside the baffle (21) is formed by connecting a first curved surface (23) and a second curved surface (24), and the second curved surface (24) is arranged tangent to the upper edge of the sound-transmitting holes (22). A cleaning rotating plate (31) is arranged inside the sound-transmitting holes (22).

2. The piezoelectric active buzzer according to claim 1, characterized in that: A vertical hole (32) is provided at the center of the stopper housing (21). An adjusting shaft (33) is rotatably provided in the vertical hole (32). The lower end of the adjusting shaft (33) is fixed to a driving bevel gear (34). The driving bevel gear (34) is meshed with a plurality of driven bevel gears (35) at the same time. The driven bevel gears (35) are fixed to one end of a rotating shaft (36). The other end of the rotating shaft (36) passes through the stopper housing (21) and is fixed to the cleaning rotating plate (31).

3. The piezoelectric active buzzer according to claim 2, characterized in that: The cleaning rotating plate (31) is a spiral plate body.

4. The piezoelectric active buzzer according to claim 2, characterized in that: A knob (38) is fixed to the upper end of the adjustment shaft (33), and an anti-slip groove is provided on the outer surface of the knob (38).

5. The piezoelectric active buzzer according to claim 1, characterized in that: The first curved surface (23) bulges downward, the second curved surface (24) bulges upward, the inner side of the second curved surface (24) is tangently connected to the outer side of the first curved surface (23), and the outer side of the second curved surface (24) is tangently arranged to the upper edge line of the sound-transmitting hole (22).

6. The piezoelectric active buzzer according to claim 1, characterized in that: The top of the buzzer body (12) is connected to the retaining shell (21) via threads.

7. The piezoelectric active buzzer according to claim 1, characterized in that: A pin (13) is provided at the bottom of the buzzer body (12).

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