Structure and principle of car horn?

The electric horn is a car horn. The coil of the automobile electric horn generates magnetic force to attract the armature. The iron core strengthens the magnetic field. The direction of the magnetic field should be judged by the right-hand spiral rule. How does the car horn attract the armature to drive the diaphragm to vibrate up and down to produce sound? Please see the following introduction about the car electric horn.

Automobile horn only emits a single tone, and its structure is different from that of acoustic horn (speaker). Audio speakers sound through the vibration of the paper tray diaphragm, and car speakers sound through the vibration of the metal diaphragm.

There are two kinds of car horns: electric horns and air horns. The electric horn is constantly turned on and off through the electromagnetic coil, which makes the metal diaphragm vibrate to produce sound, which is pleasant to listen to. The shape of electric horn is mostly spiral and basin-shaped, which is widely used in various cars. All light passenger cars use electric horns. The air horn vibrates the metal diaphragm by compressing the airflow, which is mostly long horn-shaped (cylindrical), with loud sound, high tone and long transmission distance. Large and medium-sized cars, which are mostly used for long-distance running, are forbidden to be used in cities.

The spiral car electric horn is equipped with a megaphone, which is coiled into a spiral shape to compress the volume, and the sound quality is beautiful and loud. The pot-shaped automobile electric horn is flat, small in size, light in weight, convenient to install and slightly inferior in sound quality, but it is widely used.

The basic working principle of the spiral and the basin is the same, and they are all composed of iron core (1), magnetic coil (2), contact (6), armature (5) and diaphragm (3). When the driver presses the button (8), current flows through the coil through the contact, and the coil generates magnetic force to suck the armature (5) and force the diaphragm to move. The armature moves to break the contact, and the magnetic force disappears when the current is interrupted. The diaphragm returns to the original position together with the armature under the action of its own elastic force and spring leaf, and the contact closure circuit is connected. Then current flows through the contacts to generate magnetic force, and the above actions are repeated. The diaphragm vibrates repeatedly in this way, thereby generating sound. * * * The resonance plate (4) is rigidly connected with the diaphragm, which can make the sound generated by vibration smoother and more pleasant.

Car horns are divided into high, medium and low frequencies. In order to enrich the timbre of car horns, some electric horns connect tweeters and woofers in parallel to form dual-tone horns. However, the current is relatively large, which will directly endanger the key contacts. In order to prevent the horn button contact from being burned by arc sparks, some cars connect a relay in the line and control the large current with small current, so that the horn button can be protected from being damaged only by small current. It should be pointed out that in general, the positive wire (7) of the automobile horn is powered by the fuse box, and the horn button is used to control the negative electricity of the automobile horn, so it is commonly called "ground control".

Generally, the tone and volume of the car electric horn can be adjusted. Tone can be adjusted by adjusting the gap between armature and iron core, and volume can be adjusted by adjusting contact pressure. Once the volume is adjusted, the coil current will also change. In order to maintain the specified sound quality and volume, some electric horns are completely sealed and cannot be adjusted. If they are broken, they will be replaced.

Automobile horn only emits a single tone, and its structure is different from that of acoustic horn (speaker). Audio speakers sound through the vibration of the paper tray diaphragm, and car speakers sound through the vibration of the metal diaphragm.

There are two kinds of car horns: electric horns and air horns. The electric horn is constantly turned on and off through the electromagnetic coil, which makes the metal diaphragm vibrate to produce sound, which is pleasant to listen to. The shape of electric horn is mostly spiral and basin-shaped, which is widely used in various cars. All light passenger cars use electric horns. The air horn vibrates the metal diaphragm by compressing the airflow, which is mostly long horn-shaped (cylindrical), with loud sound, high tone and long transmission distance. Large and medium-sized cars, which are mostly used for long-distance running, are forbidden to be used in cities.

The spiral car electric horn is equipped with a megaphone, which is coiled into a spiral shape to compress the volume, and the sound quality is beautiful and loud. The pot-shaped automobile electric horn is flat, small in size, light in weight, convenient to install and slightly inferior in sound quality, but it is widely used.

The basic working principle of the spiral and the basin is the same, and they are all composed of iron core (1), magnetic coil (2), contact (6), armature (5) and diaphragm (3). When the driver presses the button (8), current flows through the coil through the contact, and the coil generates magnetic force to suck the armature (5) and force the diaphragm to move. The armature moves to break the contact, and the magnetic force disappears when the current is interrupted. The diaphragm returns to the original position together with the armature under the action of its own elastic force and spring leaf, and the contact closure circuit is connected. Then current flows through the contacts to generate magnetic force, and the above actions are repeated. The diaphragm vibrates repeatedly in this way, thereby generating sound. * * * The resonance plate (4) is rigidly connected with the diaphragm, which can make the sound generated by vibration smoother and more pleasant.

Car horns are divided into high, medium and low frequencies. In order to enrich the timbre of car horns, some electric horns connect tweeters and woofers in parallel to form dual-tone horns. However, the current is relatively large, which will directly endanger the key contacts. In order to prevent the horn button contact from being burned by arc sparks, some cars connect a relay in the line and control the large current with small current, so that the horn button can be protected from being damaged only by small current. It should be pointed out that in general, the positive wire (7) of the automobile horn is powered by the fuse box, and the horn button is used to control the negative electricity of the automobile horn, so it is commonly called "ground control".

Generally, the tone and volume of the car electric horn can be adjusted. Tone can be adjusted by adjusting the gap between armature and iron core, and volume can be adjusted by adjusting contact pressure. Once the volume is adjusted, the coil current will also change. In order to maintain the specified sound quality and volume, some electric horns are completely sealed and cannot be adjusted. If they are broken, they will be replaced.