CN107395799B

CN107395799B - Expansion self-positioning linear electromagnetic switch

Info

Publication number: CN107395799B
Application number: CN201710582898.1A
Authority: CN
Inventors: 龙克文; 颜天宝
Original assignee: Chuandong Magnetic Electronic Co Ltd
Current assignee: Chuandong Magnetic Electronic Co Ltd
Priority date: 2017-07-17
Filing date: 2017-07-17
Publication date: 2020-04-10
Anticipated expiration: 2037-07-17
Also published as: CN107395799A

Abstract

The invention relates to the technical field of magnetic switches, in particular to an expansion self-positioning linear electromagnetic switch; including casing and closure piece, be equipped with magnetic coil and iron core, its characterized in that in the casing: the magnetic coil is wound on the bobbin bracket with the I-shaped section, and the iron core movably penetrates through a central hole of the bobbin bracket; the rear side of the magnetic coil is provided with a fixed magnet, the front side of the magnetic coil is provided with a stop plate, and an expansion sleeve matched with the stop plate is arranged on the iron core; the front end of the iron core is provided with a connecting rod, and the front end of the connecting rod sequentially penetrates through the travel stopping plate and the front side plate of the shell and then is fixedly connected with the blocking piece; the magnetic positioning device is reasonable in structure, the magnetic poles of the iron core are switched by the magnetic coils, the magnetic coils are matched with the fixed magnets to drive the blocking pieces on the connecting rods to block or open the leakage holes on the loudspeaker, the iron core is self-positioned through the expansion sleeve in the front stroke, and the iron core is positioned in the back stroke in an adsorption mode with the fixed magnets; the whole structure is compact, the action is flexible, the energy consumption is low, and the mobile phone communication quality can be effectively improved.

Description

Expansion self-positioning linear electromagnetic switch

Technical Field

The invention relates to the technical field of magnetic switches, in particular to an expansion self-positioning linear electromagnetic switch.

Background

Some mobile phones on the market currently have two speakers to generate surround sound effect, and such mobile phones usually use a speaker on one side to replace a receiver, and when a call is made, the power of the speaker is reduced through switching of a circuit, so that the volume of the speaker is reduced to a level suitable for listening close to the ear. However, in order to prevent the distortion of the voice, the effective frequency range of the general earphone is 300-. For this reason, some prior art loudspeakers have leakage holes in the acoustic cavity to improve the low frequency distortion, but this results in a reduction in the high frequency sound effect. Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

The invention aims to provide an expansion self-positioning linear electromagnetic switch which is reasonable in structure, compact and flexible, small in size and low in power consumption, can switch the opening and closing states of a leakage hole according to the working mode of a mobile phone and overcomes the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to an expansion self-positioning linear electromagnetic switch, which comprises a shell and a blocking piece, wherein a magnetic coil and an iron core are arranged in the shell, and the expansion self-positioning linear electromagnetic switch is characterized in that: the magnetic coil is wound on the bobbin bracket with the I-shaped section, and the iron core movably penetrates through a central hole of the bobbin bracket; the rear side of the magnetic coil is provided with a fixed magnet, the front side of the magnetic coil is provided with a stop plate, and an expansion sleeve matched with the stop plate is arranged on the iron core; the front end of the iron core is provided with a connecting rod, and the front end of the connecting rod sequentially penetrates through the front side plate of the traveling stop plate and the front side plate of the shell and then is fixedly connected with the blocking piece.

According to the scheme, the expansion sleeve comprises a bottom plate and a plurality of plastic strips, the plastic strips surround the periphery of the iron core at equal angular intervals, the bottom plate is fixed at the rear end of the iron core, and the rear ends of the plastic strips are fixedly connected with the bottom plate; the travel stopping plate is provided with a through hole, a wedge-shaped ring opposite to the iron core is arranged on the travel stopping plate, and the wedge-shaped ring and the through hole are concentrically arranged.

According to the scheme, the plastic strips and the bottom plate are of an integrated structure, and the integrated structure is in clearance fit with the central hole of the barrel frame; the front end of the plastic strip is provided with an inclined plane notch, and the inner diameter of the wedge-shaped ring is larger than the diameter of the iron core.

According to the scheme, the diameter of the passing hole is smaller than that of the iron core, and the diameter of the passing hole is larger than that of the connecting rod.

According to the scheme, two limiting blocks are arranged at the rear end of the inner cavity of the shell and are respectively fixed on the corresponding side walls of the shell, and the limiting blocks and the rear end wall of the shell are arranged at intervals to form a U-shaped clamping groove; decide magnet and wear to locate between two stoppers, and decide magnet and go up the cover and be equipped with the cutting ferrule of "protruding" font, the both ends of cutting ferrule wear to locate respectively in the draw-in groove that corresponds.

The invention has the beneficial effects that: the invention has reasonable structure, the magnetic coil switches the direction of the electrified current to switch the magnetic pole of the iron core, the magnetic coil is matched with the fixed magnet to move back and forth to drive the blocking piece on the connecting rod to block or open the leakage hole on the loudspeaker, the iron core realizes self-positioning through the expansion sleeve in the front stroke, and the iron core is adsorbed and positioned with the fixed magnet in the rear stroke; the whole structure is compact, the action is flexible, the energy consumption is low, and the mobile phone communication quality can be effectively improved.

Drawings

FIG. 1 is a schematic illustration of an explosive structure according to the present invention;

fig. 2 is a schematic cross-sectional structure of the present invention.

In the figure:

1. a housing; 2. a magnetic coil; 3. an iron core; 4. fixing a magnet; 5. an expansion sleeve; 11. a limiting block; 12. a card slot; 13. blocking sheets; 21. a barrel frame; 31. a connecting rod; 41. a card sleeve; 51. a base plate; 52. a plastic strip; 53. a bevel notch; 54. a travel stop plate; 55. a pass-through hole; 56. a wedge ring.

Detailed Description

The technical solution of the present invention is described below with reference to the accompanying drawings and examples.

As shown in fig. 1, the expanded self-positioning linear electromagnetic switch of the present invention comprises a housing 1 and a blocking piece 13, wherein a magnetic coil 2 and an iron core 3 are arranged in the housing 1, the magnetic coil 2 is wound on a bobbin bracket 21 with an i-shaped cross section, and the iron core 3 is movably inserted into a central hole of the bobbin bracket 21; the rear side of the magnetic coil 2 is provided with a fixed magnet 4, the front side of the magnetic coil 2 is provided with a stop plate 54, and the iron core 3 is provided with an expansion sleeve 5 matched with the stop plate 54; the front end of the iron core 3 is provided with a connecting rod 31, and the front end of the connecting rod 31 sequentially penetrates through the travel stop plate 54 and the front side plate of the shell 1 and then is fixedly connected with the blocking piece 13; magnetic lines of force generated when the magnetic coil 2 is electrified pass through the iron core 3, so that the iron core 3 generates a corresponding magnetic pole according to the current direction of the magnetic coil 2, and the magnetic pole direction of the fixed magnet 4 opposite to the magnetic pole direction is fixed, when the magnetic pole of the iron core 3 and the fixed magnet 4 repel each other, the iron core 3 moves forwards along the central hole of the barrel frame 21 to drive the blocking piece 13 to close the leakage hole on the mobile phone loudspeaker, at the moment, the iron core 3 is powered off by the magnetic coil 2 and is positioned at the limit position of the front stroke, the iron core 3 props against the stop plate 54 to avoid the excessive forward stroke, the expansion sleeve 5 on the expansion sleeve is matched with the stop plate 54, the diameter of the expansion sleeve 5 is increased, so that the iron core 3 cannot retract into the central hole of the barrel frame; when the magnetic coil 2 is electrified with reverse current, the iron core 3 and the fixed magnet 4 are attracted in opposite polarities, the iron core 3 overcomes the damping between the expansion sleeve 5 and the stop plate 54, the expansion sleeve 5 contracts to enable the iron core 3 to move backwards along the central hole, and the blocking piece 13 is driven to open a leakage hole on a mobile phone loudspeaker; at the moment, the short and shallow iron cores 3 of the magnetic coil 2 are positioned at the limit position of the rear stroke, and the iron cores 3 are abutted against the fixed magnets 4 and are magnetically attracted, so that the magnetic switch is kept in an open state; the invention has compact integral structure, flexible action and less energy consumption, and can effectively improve the conversation quality of the mobile phone.

The expansion sleeve 5 comprises a bottom plate 51 and a plurality of plastic strips 52, the plastic strips 52 surround the periphery of the iron core 3 at equal angular intervals, the bottom plate 51 is fixed on the rear end of the iron core 3, and the rear ends of the plastic strips 52 are fixedly connected with the bottom plate 51; a through hole 55 is formed in the traffic stop plate 54, a wedge-shaped ring 56 opposite to the iron core 3 is arranged on the traffic stop plate 54, and the wedge-shaped ring 56 and the through hole 55 are concentrically arranged; when the plurality of plastic strips 52 are in forward stroke along with the iron core 3, the front ends of the plastic strips 52 are extruded by the wedge-shaped ring 56 to expand, the diameter of the front end of the iron core 3 is increased and the front end of the iron core 3 cannot retract into the central hole of the barrel frame 21, and therefore the purpose of self-positioning of the iron core 3 in forward stroke is achieved.

The plastic strips 52 and the bottom plate 51 are of an integral structure, and the integral structure is in clearance fit with the central hole of the barrel frame 21; the front end of the plastic strip 52 is provided with an inclined notch 53, the inner diameter of the wedge-shaped ring 56 is larger than the diameter of the iron core 3, the plastic strips 52 are arranged along the circumferential direction of the iron core 3, friction between the plastic strips and the barrel frame 21 can be reduced, so that action sensitivity is improved, the rear end of the plastic strip 52 is fixed on the iron core 3 through the bottom plate 51 to realize integrated action, and the inclined notch 53 is matched with the wedge-shaped ring 56 to guide expansion action, so that action stability of the magnetic switch is improved.

The diameter of the through hole 55 is smaller than that of the iron core 3, the diameter of the through hole 55 is larger than that of the connecting rod 31, the connecting rod 31 penetrates through the through hole 55, and the annular ring between the through hole 55 and the wedge-shaped ring 56 forms a front limit of the iron core 3, so that excessive deformation and failure of the plastic strip 52 caused by excessive advancing of the iron core 3 are avoided.

Two limiting blocks 11 are arranged at the rear end of the inner cavity of the shell 1, the two limiting blocks 11 are respectively fixed on the corresponding side walls of the shell 1, and the limiting blocks 11 and the rear end wall of the shell 1 are arranged at intervals to form a U-shaped clamping groove 12; the fixed magnet 4 penetrates between the two limiting blocks 11, a clamping sleeve 41 in a shape like a Chinese character 'tu' is sleeved on the fixed magnet 4, and two ends of the clamping sleeve 41 respectively penetrate through the corresponding clamping grooves 12; two clamping grooves 12 formed by the two limiting blocks 11 respectively fix two ends of the clamping sleeve 41, the clamping sleeve 41 forms circumferential full-surrounding for the fixed magnet 4, damage to the fixed magnet 4 caused by action impact of the iron core 3 is avoided, and magnetic line shielding of the fixed magnet 4 can be achieved after magnetic shielding treatment is adopted on the rear side face of the clamping sleeve 41.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an inflation is from locating straight line electromagnetic switch, includes casing (1) and jam piece (13), is equipped with magnetic coil (2) and iron core (3) in casing (1), its characterized in that: the magnetic coil (2) is wound on the bobbin bracket (21) with the I-shaped section, and the iron core (3) is movably arranged in a central hole of the bobbin bracket (21) in a penetrating way; a fixed magnet (4) is arranged on the rear side of the magnetic coil (2), a travel stopping plate (54) is arranged on the front side of the magnetic coil (2), and an expansion sleeve (5) matched with the travel stopping plate (54) is arranged on the iron core (3); the front end of the iron core (3) is provided with a connecting rod (31), and the front end of the connecting rod (31) sequentially penetrates through the travel stop plate (54) and the front side plate of the shell (1) and then is fixedly connected with the blocking piece (13);

the expansion sleeve (5) comprises a bottom plate (51) and a plurality of plastic strips (52), the plastic strips (52) surround the periphery of the iron core (3) at equal-angle intervals, the bottom plate (51) is fixed on the rear end of the iron core (3), and the rear ends of the plastic strips (52) are fixedly connected with the bottom plate (51); the iron core is characterized in that a passing hole (55) is formed in the traffic stopping plate (54), a wedge-shaped ring (56) opposite to the iron core (3) is arranged on the traffic stopping plate (54), and the wedge-shaped ring (56) and the passing hole (55) are concentrically arranged.

2. The expanding self-positioning linear electromagnetic switch of claim 1, wherein: the plastic strips (52) and the bottom plate (51) are of an integrated structure, and the integrated structure is in clearance fit with a central hole of the barrel frame (21); the front end of the plastic strip (52) is provided with an inclined notch (53), and the inner diameter of the wedge-shaped ring (56) is larger than the diameter of the iron core (3).

3. The expanding self-positioning linear electromagnetic switch of claim 1, wherein: the diameter of the through hole (55) is smaller than that of the iron core (3), and the diameter of the through hole (55) is larger than that of the connecting rod (31).

4. The expanding self-positioning linear electromagnetic switch of claim 1, wherein: two limiting blocks (11) are arranged at the rear end of the inner cavity of the shell (1), the two limiting blocks (11) are respectively fixed on the corresponding side walls of the shell (1), and the limiting blocks (11) and the rear end wall of the shell (1) are arranged at intervals to form a U-shaped clamping groove (12); decide between magnet (4) wear to locate two stopper (11), and decide magnet (4) go up the cover and be equipped with cutting ferrule (41) of "protruding" font, the draw-in groove (12) that correspond are worn to locate respectively at the both ends of cutting ferrule (41).