CN202473727U

CN202473727U - Vacuum overload protector

Info

Publication number: CN202473727U
Application number: CN2012200003580U
Authority: CN
Inventors: 李紫薇
Original assignee: WUJIANG DONGTAI ELECTRIC POWER SPECIAL SWITCH CO Ltd
Current assignee: WUJIANG DONGTAI ELECTRIC POWER SPECIAL SWITCH CO Ltd
Priority date: 2012-01-04
Filing date: 2012-01-04
Publication date: 2012-10-03
Anticipated expiration: 2022-01-04

Abstract

The utility model relates to a vacuum overload protector which includes a housing. The inside of the housing is provided with a vacuum cavity, and the two ends of the vacuum cavity are provided with a fixing soft iron block and a conductive fixing permanent magnetic block. The inner wall of the vacuum cavity is pasted with a metal layer, and one end of the metal layer electrically contacts with the fixing soft iron block, and the other end extends to the fixing permanent magnetic block. A free soft iron block which can slide freely is arranged between the fixing soft iron block and the fixing permanent magnetic block, and the side faces of the free soft iron block contact with the metal layer. When the free soft iron block contacts with the fixing permanent magnetic block, the fixing permanent magnetic block is electrically lapped on the metal layer. The surface of the housing is provided with an excitation coil along the vacuum cavity. The excitation coil forms a serial circuit with the fixing permanent magnet block, the free soft iron block, the metal layer, and the fixing soft iron block when the fixing permanent magnetic block is electrically lapped on the metal layer. The two ends of the serial circuit are electrically connected with terminals arranged on the housing. The vacuum overload protector not only can effectively play the overload protection function in an electrical power circuit, but also can rapidly realize the automatic recovery of the circuit.

Description

The vacuum overload protector

Technical field

The utility model relates to the power switch field, especially, is a kind of being applied in the electric power system, prevents the overload protective device of big electric current.

Background technology

Along with electrical equipment kind and industrial develop rapidly, present household electricity and commercial power are also with higher speed increment; Generally, the growth rate of household appliances will be far longer than the cloth linear velocity of household lines, therefore, for the less home circuit of capacity, if start more electrical appliance simultaneously, then is easy to cause circuit overload, and burns circuit.

In view of aforesaid reason, main at present employing overload protective device is dealt with problems, and present overload protective device mainly comprises two types, and one of which is a fuse; Mainly be made up of Xi Si or tin sheet, when electric current is lasting excessive, the tin silk will be hot fast; And fusing blows, and this kind fuse is comparatively reliable, yet in case open circuit; Need manual reversion, promptly change tin silk or tin sheet, so the recovery of circuit bothers extremely; Another kind of overload protective device belongs to can recovery type protector, is mainly the thermal deformation protector, and the persistent fever through the curved metal contact expands; Make contact separated, treat that contact shrinks and closes to a period of time cooling; Though this kind protector can recover; Yet, in actual application, also has more inconvenience because the recovery stand-by period is long.

Summary of the invention

In order to address the above problem, the purpose of the utility model is to provide a kind of vacuum overload protector, and this kind vacuum overload protector not only can be brought into play the overload protective function in the power circuit effectively, and automatic recovery that can the Rapid Realization circuit.

The utility model solves the technical scheme that its technical problem adopted: this vacuum overload protector comprises the shell that non-conductor constitutes; Comprise a vacuum chamber in this shell; One end of said vacuum chamber is provided with a fixedly soft iron piece; The other end is provided with a fixedly permanent magnets, and this fixedly is made up of metal on the permanent magnets top layer; The inwall of said vacuum chamber also posts the layer of metal layer, and this metal level one end electrically contacts with said fixedly soft iron piece, and the other end extends to approaching said fixedly permanent magnets place; In the said vacuum chamber; At said fixedly soft iron piece with fixedly be provided with a free soft iron piece that can be free to slide along vacuum chamber between the permanent magnets; This free soft iron piece side closely contacts with said metal level; And when this free soft iron piece contacted said fixedly permanent magnets, can making fixedly, permanent magnets and said metal level electrically overlapped; The surface of said shell is provided with a magnet exciting coil along said vacuum chamber; Said magnet exciting coil is when said fixedly permanent magnets and said metal level electrically overlap, and with said fixedly soft iron piece, free soft iron piece, metal level, fixedly permanent magnets constitutes the string road, the binding post on the said shell is located in this two ends, string road electric connection.

As preferably; Said magnet exciting coil through behind the rectification circuit again with said fixedly permanent magnets, free soft iron piece, metal level, fixedly the soft iron piece constitutes the string road, and said magnet exciting coil is after rectification is switched on; The intrinsic direction of magnetization to the direction of magnetization of said fixedly soft iron piece and free soft iron piece and said fixedly permanent magnets is opposite; Thereby when said fixedly soft iron piece and free soft iron piece are magnetized, produce repulsion, flick fixedly permanent magnets rapidly with said fixedly permanent magnets.

As preferably, said metal level is made up of copper, its smooth surface; Not only guaranteed good electrical conductivity, and, can prevent said free soft iron piece to be produced viscosity because metal level is magnetized, be convenient to this free soft iron piece and slide.

The beneficial effect of the utility model is: this vacuum overload protector is when work; Electric current hour in the circuit that is inserted; Because said fixedly permanent magnets is to the attraction of said free soft iron piece; Fixedly permanent magnets of free soft iron piece applying be will make, thereby said magnet exciting coil, fixedly permanent magnets, free soft iron piece, metal level, the fixedly string road maintenance connection of soft iron piece formation made; When electric current was excessive, then said free soft iron piece was identical all the time with the direction of magnetization of fixing soft iron piece, and the electric current in the magnetization and the said magnet exciting coil; That is with whole circuit in electric current positive correlation, promptly said free soft iron piece and fixedly suction between the soft iron piece and size of current positive correlation, so; When electric current is excessive in the circuit, said free soft iron piece will break away from said fixedly permanent magnets and inhale to said fixedly soft iron piece, thereby break off described string road; Each is cut off with electric loading, after this, because exciting current is cut off; Said free soft iron piece and fixedly the soft iron piece lose magnetism, free soft iron piece is attracted by said fixedly permanent magnets again, again circuit is connected; And this moment a part of electrical equipment, like computer, television set, air-conditioning or the like owing to can't start voluntarily after cutting off, therefore; Whole circuit is in a safe condition, and the user can reduce the use of electrical appliance as the case may be, thereby makes the circuit after the recovery be in lasting safe condition.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the utility model vacuum overload protector;

Fig. 2 is the state diagram under on-state of Fig. 1 embodiment;

Fig. 3 is the sketch map under off-state of Fig. 1 embodiment.

Among the figure: 1, shell; 10, vacuum chamber; 20, fixing soft iron piece; 201, metal level; 21, free soft iron piece; 22, fixing permanent magnets; 3, magnet exciting coil; 4,5, binding post.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further specified:

In the embodiment shown in fig. 1; This vacuum overload protector comprises the shell 1 that non-conductor constitutes; Comprise a vacuum chamber 10 in this shell 1; One end of said vacuum chamber 10 is provided with a fixedly soft iron piece 20, and the other end is provided with a fixedly permanent magnets 22, and this fixedly is made up of metal on permanent magnets 22 top layers; The inwall of said vacuum chamber 10 also posts layer of metal layer 201, and these metal level 201 1 ends electrically contact with said fixedly soft iron piece 20, and the other end extends to approaching said fixedly permanent magnets 22 places; In the said vacuum chamber 10; At said fixedly soft iron piece 20 with fixedly be provided with a free soft iron piece 21 that can be free to slide along vacuum chamber 10 between the permanent magnets 22; These free soft iron piece 21 sides closely contact with said metal level 201; And when the said fixedly permanent magnets 22 of these free soft iron piece 21 contacts, can making fixedly, permanent magnets 22 and said metal level 201 electrically overlap; The surface of said shell 1 is provided with a magnet exciting coil 3 along said vacuum chamber 10; When said magnet exciting coil 3 electrically overlaps with said metal level 201 in said fixedly permanent magnets 22; With said fixedly soft iron piece 20, free soft iron piece 21, metal level 201, fixedly permanent magnets 22 constitutes the string roads, the binding post 4,5 on the said shell 1 is located in this two ends, string road electric connection.

Described shell 1 can be cylindrical or square column type, and also cylindrical being advisable of said vacuum chamber 10 that it is inner can structurally farthest reduce the resistance to sliding of said free soft iron piece 21; In addition, for the resistance to sliding that prevents that thermal deformation from causing, said shell 1 can be made up of adiabatic plastics or insulating ceramic.

In Fig. 1 embodiment, the binding post 4 that said fixedly soft iron piece 20 is directly corresponding with it electrically connects, and said fixedly permanent magnets 22 then electrically connects corresponding volume binding post 5 behind the said magnet exciting coil 3 of serial connection earlier again.Said metal level 201 constitutes its smooth surface by copper; Not only guaranteed good electrical conductivity, and, can prevent said free soft iron piece 21 to be produced viscosity because metal level 201 is magnetized, be convenient to this free soft iron piece 21 and slide.

Above-mentioned vacuum overload protector is when work; Electric current hour in the circuit that is inserted; Because the attraction of 22 pairs of said free soft iron pieces 21 of said fixedly permanent magnets; The free soft iron piece 21 fixedly permanent magnets 22 of fitting be will make, thereby said magnet exciting coil 3, fixedly permanent magnets 22, free soft iron piece 21, metal level 201, the fixedly string road maintenance connection of soft iron piece 20 formations, state as shown in Figure 2 made; When electric current is excessive; Then said free soft iron piece 21 is identical all the time with the direction of magnetization of fixing soft iron piece 20, and the electric current in the magnetization and the said magnet exciting coil 3, that is with whole circuit in electric current positive correlation; Be said free soft iron piece 21 and fixedly suction between the soft iron piece 20 and size of current positive correlation; So, when electric current is excessive in the circuit, said free soft iron piece 21 will break away from said fixedly permanent magnets 22 and inhale to said fixedly soft iron piece 20; Thereby break off described string road, state as shown in Figure 3; At this moment, each is cut off with electric loading, after this; Because exciting current is cut off, said free soft iron piece 21 loses magnetism with fixing soft iron piece 20, and free soft iron piece 21 is attracted by said fixedly permanent magnets 22 again; Again circuit is connected, and this moment a part of electrical equipment, like computer, television set, air-conditioning or the like owing to can't start voluntarily after cutting off; Therefore; Whole circuit is in a safe condition, and the user can reduce the use of electrical appliance as the case may be, thereby makes the circuit after the recovery be in lasting safe condition.

In improving design, said magnet exciting coil 3 can also through behind the rectification circuit again with said fixedly permanent magnets 22, free soft iron piece 21, metal level 201, fixedly soft iron piece 20 constitutes and goes here and there roads, this rectification circuit can be bridge rectifier; And make said magnet exciting coil 3 after the rectification energising; The direction of magnetization to said fixedly soft iron piece 20 and free soft iron piece 21 is opposite with the intrinsic direction of magnetization of said fixedly permanent magnets 22, and specifically method of attachment is a techniques well known, repeats no more; So; When said fixedly soft iron piece 20 is magnetized with free soft iron piece 21, produce repulsion, flick fixedly permanent magnets 22 rapidly with said fixedly permanent magnets 22.

In addition, described fixedly soft iron piece 20, free soft iron piece 21 can also be replaced by other soft magnetism electric conducting material, like the silicon steel piece.

The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the utility model.

Claims

1. vacuum overload protector; Comprise the shell (1) that non-conductor constitutes; It is characterized in that: comprise a vacuum chamber (10) in this shell (1); One end of said vacuum chamber (10) is provided with a fixedly soft iron piece (20), and the other end is provided with a fixedly permanent magnets (22), and this fixedly is made up of metal on permanent magnets (22) top layer; The inwall of said vacuum chamber (10) also posts layer of metal layer (201), and these metal level (201) one ends electrically contact with said fixedly soft iron piece (20), and the other end extends to locating near said fixedly permanent magnets (22); In the said vacuum chamber (10); At said fixedly soft iron piece (20) with fixedly be provided with a free soft iron piece (21) that can be free to slide along vacuum chamber (10) between the permanent magnets (22); This free soft iron piece (21) side closely contacts with said metal level (201); And when this free soft iron piece (21) said fixedly permanent magnets of contact (22), can making fixedly, permanent magnets (22) electrically overlaps with said metal level (201); The surface of said shell (1) is provided with a magnet exciting coil (3) along said vacuum chamber (10); Said magnet exciting coil (3) is at said fixedly permanent magnets (22) and said metal level (201) when electrically overlapping; With said fixedly soft iron piece (20), free soft iron piece (21), metal level (201), fixedly permanent magnets (22) constitutes the string road, these two ends, string road electrically connect is located at the binding post (4,5) on the said shell (1).

2. vacuum overload protector according to claim 1; It is characterized in that: said magnet exciting coil (3) through behind the rectification circuit again with said fixedly permanent magnets (22), free soft iron piece (21), metal level (201), fixedly soft iron piece (20) constitutes and goes here and there the road; And; Said magnet exciting coil (3) is after rectification energising, and is opposite to the intrinsic direction of magnetization of the direction of magnetization of said fixedly soft iron piece (20) and free soft iron piece (21) and said fixedly permanent magnets (22).

3. vacuum overload protector according to claim 1 is characterized in that: said metal level (201) is made up of copper, its smooth surface.

4. according to any described vacuum overload protector in the claim 1 to 3, it is characterized in that: said fixedly soft iron piece (20), free soft iron piece (21) replace by the silicon steel piece.