CN101950558B

CN101950558B - Buzzer

Info

Publication number: CN101950558B
Application number: CN201010505664A
Authority: CN
Inventors: 郭金猷
Original assignee: Xiuwu Electric Co
Current assignee: Xiuwu Electric Co; State Grid Corp of China SGCC
Priority date: 2010-10-13
Filing date: 2010-10-13
Publication date: 2012-10-10
Anticipated expiration: 2030-10-13
Also published as: CN101950558A

Abstract

The invention provides a buzzer, which comprises a thin-wall iron cylinder, a vibration cylinder wall, a solenoid and an iron core. The iron core is a long-cylinder type iron magnet covered with the solenoid. The thin-wall iron cylinder encircled by a folded thin iron sheet is arranged inside the iron core and is coaxial with the iron core. The vibration cylinder wall encircles the thin-wall iron cylinder and is encircled by the folded thin plastic sheet. The folding part of the thin-wall iron cylinder is staggered with the folding part of the vibration cylinder wall, and the surfaces of the both are not adhered mutually. The solenoid is connected in series with a capacitor and the capacitance of the capacitor satisfies such a relation that a series resonance is formed by the serial connection of the solenoid and the capacitor under the frequency of an alternating current. The buzzer cannot only automatically prompt the current size condition in a power circuit, but also has the advantages of simple structure, wide installation, strong warning effect and remote reminding.

Description

Hummer

Technical field

The present invention relates to power domain, especially a kind of hummer that is used for pointing out the electric wire size of current.

Background technology

In present distribution system,, generally all adopt instrument to indicate, yet the cost of instrument is higher for the current conditions of each circuit; And the protection requirement is bigger, therefore makes to be used less, and should not extensively install; Generally only power hub etc. locate and residential building in be equipped with, for not adopting at common outdoor environment place, locate also not to be provided with ammeter like some common coupling boxes, ring main unit etc.; For other circuit pack that disperses, then more has no the electric current indicating instrument, therefore; In the time of need understanding the current conditions in the circuit out of doors, must use special-purpose instrument to detect, its process comparatively bothers.

On the other hand, adopt instrument indicator currents such as ammeter, when needs are understood the roughly situation of electric current in the circuit, need can read situation near ammeter, ammeter does not have long-range indicative function, and warning is poor, and in a word, it is convenient inadequately to utilize ammeter to obtain line current information.

Summary of the invention

To the problems referred to above, the object of the present invention is to provide a kind of hummer, this hummer not only can be pointed out the situation of the size of current in the power circuit automatically, and simple in structure, can extensively install, and warning is strong, can realize remote prompting.

The technical solution adopted for the present invention to solve the technical problems is: this hummer comprises thin-walled work durm, vibration barrel, solenoid, iron core; Said iron core is a long cartridge type ferromagnet, the said solenoid of outer wrap, and said thin-walled work durm is surrounded by the sheet iron of fold; Be arranged at said unshakable in one's determination inner; And coaxial with said iron core, the said thin-walled work durm outside is round said vibration barrel, and this vibration barrel is surrounded by the thin plastic sheet of fold; And the fold of the fold of said thin-walled work durm and said vibration barrel staggers each other, and promptly do not fit each other in both surfaces; A said solenoid and a capacitance series, the capacitance of this electric capacity satisfy following relation: under ac frequency, form series resonance when said solenoid and said capacitances in series.

As preferably, said solenoid covers the whole outer surface of said iron core, and said solenoidal internal resistance is less than 1 Ω.

As preferably, said iron core is the soft magnetic iron magnet, has very narrow hysteresis loop, can adopt permalloy.

As preferably, also comprise a cylindrical housing outside the said solenoid, to protect whole hummer.

As preferably, the fold of said thin-walled work durm is the waveform fold, and the fold of said vibration barrel is the serrate fold.

As preferably, glue together by glue between said thin-walled work durm and the said vibration barrel.

As preferably, a said solenoid and a capacitance series, the capacitance of this electric capacity satisfy following relation: under ac frequency; Form series resonance when said solenoid and said capacitances in series; Thereby when making the hummer place in circuit, be equivalent to short circuit, do not influence the electric current in the origin wire.

Beneficial effect of the present invention is: this buzzer only needs an end of the electric capacity in solenoidal two ends or a solenoidal end and the preferred version is connected in series in one section electric wire in use, then owing to the alternating current that is that flows through in the electric wire; Therefore it will go out alternating magnetic field in the solenoid induced inside, and this alternating magnetic field is strengthened by iron core, and passes the thin-walled work durm; Because Lenz's law, the thin-walled work durm will be flexible along with passing its inner alternating magnetic field generation alternation, show as the continuous vibration of the fold of thin-walled work durm; Thereby drive the continuous vibration of vibration barrel, constitute by plastic tab owing to vibrate barrel, so Oscillation Amplitude is bigger; Container wall surrounding air forms the bigger sound wave of energy, sends the big sound; And electric current is big more in the electric wire, and the sound that buzzer sends is big more, therefore; Can judge the size of current situation in the electric wire based on the sound of buzzer a long way off, and form series resonance when solenoid and capacitances in series, so solenoidal access does not influence the electric current in the origin wire; Because said this buzzer not only can be pointed out the situation of the size of current in the power circuit automatically, and simple in structure, can extensively install, and warning is strong, can realize remote prompting.

Description of drawings

Fig. 1 is the cross-sectional view of this hummer.

Fig. 2 is the schematic side view of this hummer.

In the accompanying drawing: 1, the thin-walled work durm; 2, the vibration barrel; 3, solenoid; 4, iron core; 5, electric capacity.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further specified:

As shown in Figure 1, this hummer comprises that mainly thin-walled work durm 1, vibration barrel 2, solenoid 3, unshakable in one's determination 4, said unshakable in one's determination 4 are a long cartridge type ferromagnet; The said solenoid 3 of outer wrap; Said thin-walled work durm 1 is surrounded by the sheet iron of fold, is arranged at said 4 inside unshakable in one's determination, and with said unshakable in one's determination 4 coaxial; Said thin-walled work durm 1 outside is round said vibration barrel 2; This vibration barrel 2 is surrounded by the thin plastic sheet of fold, and the fold of the fold of said thin-walled work durm 1 and said vibration barrel 2 staggers i.e. applying each other of both surfaces each other; A said solenoid and a capacitance series, the capacitance of this electric capacity satisfy following relation: under ac frequency, form series resonance when said solenoid 3 and said capacitances in series.

Above-mentioned hummer, said solenoid 3 covers said unshakable in one's determination 4 whole outer surface, and the internal resistance of said solenoid 3 is less than 1 Ω.

Above-mentioned hummer, said unshakable in one's determination 4 is the soft magnetic iron magnet, has very narrow hysteresis loop, can adopt permalloy, can make these iron core 4 interior magnetic induction density more promptly follow the variation of alternating current like this.

Above-mentioned hummer, said solenoid 3 outsides also comprise a cylindrical housing, to protect whole hummer.

Above-mentioned hummer, the fold of said thin-walled work durm 1 are the waveform fold, and the fold of said vibration barrel 2 is the serrate fold.

Above-mentioned hummer is glued together by glue between said thin-walled work durm 1 and the said vibration barrel 2.

Above-mentioned hummer, said solenoid 3 is as shown in Figure 2 with the said electric capacity 5 formed resonant circuits that are connected in series, and the capacitance of this electric capacity 5 satisfies following relation: under ac frequency; Said solenoid 3 forms series resonance when connecting with said electric capacity 5; Thereby when making the hummer place in circuit, be equivalent to short circuit, do not influence the electric current in the origin wire; Choosing of capacitance can be calculated by following formula: ω L=1/ ω C (being the capacitive reactance that the induction reactance of solenoid 3 equals electric capacity 5); Wherein, ω is a pulsation, and L is that said solenoid 3 is around in said inductance value unshakable in one's determination at 4 o'clock.

Above-mentioned buzzer only needs the two ends of solenoid 3 or an end of solenoid 3 and an end of the electric capacity 5 in the preferred version are connected in series in one section electric wire in use, then since flow through in the electric wire be alternating current; Therefore it will go out alternating magnetic field in solenoid 3 induced inside, and this alternating magnetic field is strengthened by unshakable in one's determination 4, and passes thin-walled work durm 1; Because Lenz's law, thin-walled work durm 1 will be flexible along with passing its inner alternating magnetic field generation alternation, show as the continuous vibration of the fold of thin-walled work durm 1; Thereby drive the continuous vibration of vibration barrel 2, because vibration barrel 2 is made up of plastic tab, so Oscillation Amplitude is bigger; Container wall surrounding air forms the bigger sound wave of energy, sends the big sound; And electric current is big more in the electric wire; The sound that buzzer sends is big more, therefore, can judge the size of current situation in the electric wire based on the sound of buzzer a long way off; And form series resonance when solenoid 3 is connected with electric capacity 5, so the access of solenoid 3 does not influence the electric current in the origin wire; This buzzer not only can be pointed out the situation of the size of current in the power circuit automatically, and simple in structure, can extensively install, and warning is strong, can realize remote prompting.

Claims

1. hummer is characterized in that: it comprises thin-walled work durm, vibration barrel, solenoid, iron core, and said iron core is a long cartridge type ferromagnet; The said solenoid of outer wrap; Said thin-walled work durm is surrounded by the sheet iron of fold, is arranged at said inside unshakable in one's determination, and coaxial with said iron core; The said thin-walled work durm outside is round said vibration barrel; This vibration barrel is surrounded by the thin plastic sheet of fold, and the fold of the fold of said thin-walled work durm and said vibration barrel staggers i.e. applying each other of both surfaces each other; A said solenoid and a capacitance series, the capacitance of this electric capacity satisfy following relation: under ac frequency, form series resonance when said solenoid and said capacitances in series.

2. hummer according to claim 1 is characterized in that: said solenoid covers the whole outer surface of said iron core, and said solenoidal internal resistance is less than 1 Ω.

3. hummer according to claim 1 is characterized in that: said iron core is the soft magnetic iron magnet.

4. hummer according to claim 1 is characterized in that: the said solenoid outside also comprises a cylindrical housing.

5. hummer according to claim 1 is characterized in that: the fold of said thin-walled work durm is the waveform fold, and the fold of said vibration barrel is the serrate fold.

6. hummer according to claim 1 is characterized in that: glued together by glue between said thin-walled work durm and the said vibration barrel.