CN110164408B - A sustainable sounding electromagnetic buzzer with heat dissipation function - Google Patents

Abstract

The invention discloses a sustainable sounding electromagnetic buzzer with heat dissipation function, comprising a base, an electromagnetic drive device and an upper cover, the base is provided with an electromagnetic drive device and an upper cover, and the upper cover is covered On the outside of the electromagnetic drive device, a rotary drive device is installed in the inner cavity of the base, a cross bar is installed above the rotary drive device, a pair of conductive joints are provided on one side of the cross bar, and several pairs of conductive contacts are provided on the top of the inner cavity of the base , the conductive contacts can be in contact with the conductive joints, and a group of electromagnetic driving devices is connected to the top of each pair of conductive contacts. In the present invention, by setting three electromagnetic driving devices, only one electromagnetic driving device is energized at the same time to drive the vibrating plate to vibrate and sound, which effectively reduces the working time of a single coil. When the buzzer sounds for a long time, each coil has Stop working for a period of time to avoid burning the buzzer due to continuous heat.

Description

A sustainable sounding electromagnetic buzzer with heat dissipation function

technical field

The invention relates to the technical field of electromagnetic buzzer equipment, in particular to a sustainable sounding electromagnetic buzzer with heat dissipation function.

Background technique

The electromagnetic buzzer is an electroacoustic device that passes an audio signal through an electromagnetic coil to generate a changing magnetic field to push a metal diaphragm to vibrate and sound. The existing patent is an electromagnetic buzzer with heat dissipation function (Patent No.: 201711361381.6). The bottom of the buzzer body is connected to the colored lens through a snap connector, and a heat dissipation layer is arranged under the colored lens. A plugboard is fixed on one side of the protective case, and a power adapter is installed on the plugboard, and a heat dissipation groove is opened on the surface of the power adapter, and the electronic components inside the buzzer body are arranged on the side of the buzzer body through a heat conducting rod. connected to the heat sink. This electromagnetic buzzer adopts components such as heat dissipation layer, heat dissipation groove, heat dissipation hole and heat dissipation fin, and has a strong heat dissipation function, but there are the following problems: (1) the volume of the buzzer is too large due to too many heat dissipation elements, It is not suitable for integrated circuits; (2) The device is covered with a waterproof protective cover, and the sound effect is not good.

The existing patented striking electromagnetic buzzer (Patent No.: 201420102530.2) uses a rotatable cylinder with a prominent conductive interface as the axis, and connects to the electromagnet when rotating to attract the striking hammer to hit the electromagnet to make a sound. This percussive electromagnetic buzzer adopts percussive sounding method, the sound is crisp and clear, and the service life is long, but the fixed end of the percussive buzzer is stressed, and long-term use will cause a burden on the circuit board, causing the buzzer to fall off Even the problem of broken circuit boards.

Contents of the invention

Purpose of the invention: The purpose of the invention is to provide a sustainable sounding electromagnetic buzzer with heat dissipation function, which can effectively solve the problem of component damage caused by the heat generated by ordinary buzzers for a long time.

Technical solution: the present invention includes a base, an electromagnetic drive device and an upper cover. The base is provided with an electromagnetic drive device and an upper cover. The upper cover is covered outside the electromagnetic drive device. The inner cavity of the base is equipped with a rotating The drive device is equipped with a cross bar above the rotary drive device, a pair of conductive joints are provided on one side of the cross bar, and several pairs of conductive contacts are provided on the top of the inner cavity of the base, and the conductive contacts can be in contact with the conductive joints. A group of electromagnetic driving devices are connected to the tops of the conductive contacts.

The electromagnetic drive device includes a heat dissipation column. The interior of the heat dissipation column is provided with an iron core, and the exterior is wound with an electromagnetic coil. The heat dissipation column is made of heat-conducting silica gel, which can effectively dissipate the heat generated by the buzzer to the outside.

The electromagnetic coil is connected with the conductive contact.

Both the center of the electromagnetic drive device and the inside of the upper cover are provided with magnets, wherein the magnet in the center of the electromagnetic drive device is fixed on the top of the base; the magnet inside the upper cover is fixed on the inner wall of the upper cover corresponding to the electromagnetic drive device.

A vibrating piece is arranged above the electromagnetic drive device, and a metal piece is arranged on the vibrating piece, and the two ends of the vibrating piece are fixed with the upper cover.

The top of the upper cover is provided with a sound hole.

The rotary driving device includes a rotary motor, the rotary motor is fixed on the bottom of the inner cavity of the base. Drive the rotating shaft and the cross bar to rotate, make the conductive joint contact with the conductive contact, connect the electromagnetic coil to generate a magnetic field, and make the vibrating plate vibrate and produce sound.

The base and the upper cover are made of heat-conducting silica gel, which can effectively dissipate the heat generated by the buzzer to the outside.

A welding pad is fixed on the bottom of the base.

Working principle: When in use, the rotating motor is energized, and the rotating motor drives the rotating shaft and the crossbar to rotate. When the crossbar rotates to a certain angle, the conductive joint is connected to a pair of conductive contacts, and the electromagnetic coil above the conductive contacts is connected. The two pairs of unconnected conductive contacts and their corresponding electromagnetic coils do not work. The electromagnetic coil and the magnet jointly generate a magnetic field to attract the metal sheet above the device. The metal sheet drives the vibrating plate to vibrate, and the vibrating plate vibrates to produce sound, and the sound passes through the center of the upper cover. Pronunciation holes come out.

Beneficial effect: the present invention has the following advantages:

(1) The present invention sets three electromagnetic drive devices, and only one electromagnetic drive device is energized at the same time to drive the vibrating plate to vibrate and sound, which effectively reduces the working time of a single coil. When the buzzer sounds for a long time, each The coil will stop working for a period of time to avoid burning out the buzzer due to continuous heating;

(2) The base, upper cover and internal hollow heat dissipation column of the present invention are all made of heat-dissipating material heat-conducting silica gel. When the buzzer works, the coil generates heat, and the heat dissipation column guides the heat generated by the coil into the base and the upper cover in time, so that the heat can be quickly dissipated. Into the outside world, keep the electromagnetic drive device at a suitable temperature to avoid burning out.

Description of drawings

Fig. 1 is a front view sectional structure diagram of the present invention;

Fig. 2 is a top view of the present invention without an upper cover.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Fig. 1 and Fig. 2, the present invention comprises base 1, electromagnetic driving device 2 and loam cake 3, and the top of base 1 is provided with electromagnetic actuating device 2 and loam cake 3, and loam cake 3 covers the outside of electromagnetic actuating device 2, The upper cover 3 is bonded to the base 1 with an adhesive with good heat dissipation performance. The base 1 is a hollow cylindrical structure, and the bottom of the inner chamber of the base 1 is equipped with a rotating drive device. The rotary driving device includes a rotary motor 13, which is installed at the central position of the inner bottom of the base 1, and the center of the rotary motor 13 is covered with a rotating shaft 12, and the top of the rotating shaft 12 is fixed to the top of the inner cavity of the base 1. The rod 14 and the rotating motor 13 can drive the rotating shaft 12 and the cross rod 14 to rotate together. One side of the crossbar 14 is provided with a pair of conductive joints 11 distributed at a certain distance, and three pairs of conductive contacts 16 are provided on the top of the inner cavity of the base 1. When the crossbar 14 rotates at a certain angle, one pair of conductive contacts 16 can Contact with the conductive joint 11, and then turn on the electromagnetic coil 22 to generate a magnetic field to make the vibrating piece 33 vibrate and sound. A group of electromagnetic driving devices 2 is connected to the top of each pair of conductive contacts 16 . The three electromagnetic drive devices 2 are driven to work alternately by the rotary drive device, and only one device is in working state at the same time.

As shown in FIG. 2 , there are three groups of electromagnetic driving devices 2 , which are evenly distributed along the circumference of the base 1 . Each group of electromagnetic driving devices 2 includes a heat dissipation column 24, which is integrally formed with the base 1, adopts a hollow cylindrical structure inside, and three heat dissipation columns 24 are distributed in an equilateral triangle. centered. The interior of the heat dissipation column 24 is provided with an iron core 23 conforming to its structure. The iron core 23 is fixed inside the heat dissipation column 24 with an adhesive, and the outside of the heat dissipation column 24 is provided with an electromagnetic coil 22 surrounding the heat dissipation column 24. A pair of conductive contacts 16 are correspondingly connected below, as shown in FIG. 1 . Wherein, the base 1 , the upper cover 3 and the heat dissipation column 24 are made of heat-conducting silica gel, which can effectively dissipate the heat generated by the buzzer to the outside. The center of the electromagnetic drive device 2 and the inside of the upper cover 3 are provided with magnets 21, wherein the magnet 21 at the center of the electromagnetic drive device 2 is fixed at the central position of the top of the base 1; On the inner wall of the corresponding upper cover, there are three evenly spaced magnets 21 on the inner wall of the upper cover 3. The electromagnetic coil 22 and the magnet 21 jointly generate a magnetic field to attract the metal sheet 32 above the device, and the metal sheet 32 drives the vibrating sheet 33 to vibrate. vocalize.

As shown in Figure 1, a vibrating piece 33 is provided above the electromagnetic drive device 2, and three thin metal sheets 32 distributed at intervals are arranged on the vibrating piece 33, and the two ends of the vibrating piece 33 are fixed to the inner wall of the upper cover 3, and the upper cover 3 The middle part is provided with a sound hole 31 . A pad 15 is fixed on the bottom of the base 1, through which the pad 15 is welded to the circuit board. When the circuit board is energized, the rotating motor 13 can be energized.

When in use, the rotating motor is energized, and the rotating motor drives the rotating shaft and the cross bar to rotate. When the cross bar rotates to a certain angle, the conductive joint is connected to a certain pair of conductive contacts, and the electromagnetic coil above the conductive contacts is connected, and the other two pairs are not connected. The connected conductive contact and its corresponding electromagnetic coil do not work. The electromagnetic coil and the magnet jointly generate a magnetic field to attract the metal sheet above the device. The metal sheet drives the vibrating plate to vibrate, and the vibrating plate vibrates to produce sound, and the sound is transmitted through the sound hole in the center of the upper cover. out. When the present invention is energized and working, the coil and the vibrating piece will generate heat, and the base, upper cover and heat-conducting column made of heat-dissipating material heat-conducting silica gel can transfer the heat in time and disperse it into the outside world, so as to prevent the coil and vibrating piece from burning out and causing buzzing device, causing its sound to be changed or even damaged. In this way, the three devices are driven to work alternately through the rotary drive device inside the base, and only one device is in working state at the same time, thereby improving the service life of the buzzer.

Claims (8)

1. A sustainable sounding electromagnetic buzzer with heat dissipation function is characterized in that it comprises a base, an electromagnetic drive device and a loam cake, and the described base is provided with an electromagnetic drive device and a loam cake, and the loam cake Covered on the outside of the electromagnetic drive device, a rotary drive device is installed in the inner cavity of the base, a cross bar is installed above the rotary drive device, a pair of conductive joints are provided on one side of the cross bar, and several pairs of conductive contacts, the conductive contacts can be in contact with conductive joints, and a group of electromagnetic drive devices are connected to the top of each pair of conductive contacts, and the electromagnetic drive devices include heat dissipation columns. An electromagnetic coil is wound, and the heat dissipation column is made of heat-conducting silica gel. 2. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1, characterized in that the electromagnetic coil is connected to a conductive contact. 3. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1, characterized in that, the center of the electromagnetic drive device and the inside of the upper cover are provided with magnets, wherein the center of the electromagnetic drive device The magnet is fixed on the top of the base; the magnet inside the upper cover is fixed on the inner wall of the upper cover corresponding to the electromagnetic drive device. 4. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1 or 3, characterized in that, a vibrating piece is arranged above the electromagnetic drive device, and a metal sheet is arranged on the vibrating piece to vibrate The two ends of the sheet are fixed with the upper cover. 5. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1, characterized in that, the top of the upper cover is provided with a sounding hole. 6. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1, characterized in that, said rotary drive device comprises a rotary motor, and said rotary motor is fixed at the bottom of the inner cavity of the base A rotating shaft is sheathed on the rotating motor, the top of the rotating shaft is fixed to the top of the inner cavity of the base, and the top of the rotating shaft is connected with a cross bar. 7. A sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1, characterized in that the base and the upper cover are made of heat-conducting silica gel. 8 . The sustainable sounding electromagnetic buzzer with heat dissipation function according to claim 1 , wherein a welding pad is fixed on the bottom of the base. 9 .

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