CN113506713B

CN113506713B - Device for emergency protection of circuit

Info

Publication number: CN113506713B
Application number: CN202111065346.6A
Authority: CN
Inventors: 肖佳丽
Original assignee: Jiangxi Taorui Automation Equipment Co ltd
Current assignee: Jiangxi Taorui Automation Equipment Co ltd
Priority date: 2021-09-12
Filing date: 2021-09-12
Publication date: 2021-12-21
Anticipated expiration: 2041-09-12
Also published as: CN113506713A

Abstract

The invention discloses a device for circuit emergency protection, which relates to the field of circuit protection and comprises a protection shell, wherein an input wiring terminal at the upper end of the protection shell is respectively and electrically connected with an input contact piece, the lower end of the input contact piece is provided with an elastic breaking contact piece, the lower end of an electric wire connected with the lower end of the elastic breaking contact piece is provided with an electric wire connecting contact piece, the inner end of an output wiring terminal arranged at the lower end of the protection shell is connected with an output contact piece, and the two output contact pieces are connected with the two electric wire connecting contact pieces through a replaceable fuse component, so that the device has the advantages that: when the fuse is fused, the fuse socket is disassembled, the fuse clamped in the fuse socket can be replaced, then the fuse socket is inserted into the lateral sliding cavity of the protective shell again, and the fuse is enabled to conduct circuit connection on the two pairs of wire connecting contact pieces and the output contact pieces again, so that the integral shell does not need to be disassembled, and the fuse is simple and convenient to replace.

Description

Device for emergency protection of circuit

Technical Field

The invention relates to the field of circuit protection, in particular to a device for emergency protection of a circuit.

Background

The circuit emergency protector is mainly used for protecting the electric shock of a person with fatal danger when the equipment has electric leakage fault, has the functions of overload and short circuit protection, and can be used for protecting the overload and short circuit of a line or a motor. When a short circuit occurs, the temperature of a fuse of a circuit breaker in the conventional circuit emergency protection device rises and is fused, the fuse is very troublesome to replace in the conventional technology, a shell needs to be detached during replacement, and electric shock accidents are easy to occur due to manual replacement.

Prior art CN201910578276.0 discloses a fuse that can change automatically, the right side fixed mounting of fuse shell has fixed frame, the inside well upper end fixed mounting of fuse shell has the contact strip, and the contact overlap joint of touching electricity strip left end has the fuse, and the becket has been cup jointed at the middle part of fuse, and the right-hand member fixed mounting of becket has the connecting rod, and the right-hand member fixed mounting of connecting rod has the fixed block, the surface movable mounting of fixed block has the commentaries on classics board, the right-hand member fixed mounting who changes the board has fixed ball. Through the matching use of the metal ring, the first fuse, the rotating plate, the hinge rod, the second fuse and the balance plate, when the circuit is disconnected due to excessive current and excessive heat caused by instantaneous excessive current of the fuse, the first fuse can be effectively ensured to slowly fall down through the matching use of the metal ring and the balance plate, so that the second fuse is in electric shock contact with the right end of the contact bar, the circuit is switched on, the automatic replacement is realized, the manual replacement is not needed, and the safety of people is ensured; the first fuse and the second fuse are left in the file for switching use, however, after the two fuses are all fused, the fuse shell still needs to be manually disassembled, the two damaged fuses are replaced, and the problem that a worker cannot put the fuse into the replacement process by switching on the circuit carelessly is solved fundamentally.

Disclosure of Invention

The present invention is directed to a device for emergency protection of a circuit to solve the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a device for emergency circuit protection comprises a protective casing, wherein a pair of input connection terminals are arranged at the upper end of the protective casing, the two input connection terminals are respectively and electrically connected with input contact pieces, the inner ends of the input contact pieces extend into the protective casing, a pair of elastic breaking contact pieces are respectively arranged at the lower ends corresponding to the two input contact pieces, the lower ends of the two elastic breaking contact pieces are respectively connected with electric wires, the lower ends of the electric wires are connected with fixed electric wire connecting contact pieces, a pair of output connection terminals are arranged at the lower end of the protective casing, output contact pieces are respectively and electrically connected with output contact pieces, the inner ends of the output contact pieces extend into the protective casing, the two output contact pieces and the two electric wire connecting contact pieces are connected through a replaceable fuse assembly, a linkage curved rod piece is arranged at one side of the upper end position corresponding to the two elastic breaking contact pieces, and is connected to one side of the elastic breaking contact pieces through pins, be equipped with the driving lever on the linkage curved bar spare, the upper end of two elasticity disconnected contact pieces is pull to the driving lever, and the linkage curved bar spare is equipped with the torsional spring with the switching department of pin, and the linkage curved bar spare is kept away from the one end that elasticity disconnected contact piece is fixed with armature, two the electric wire passes along zero sequence transformer middle part, and zero sequence transformer outside is rolled up there is first coil, and the one side that is located armature is equipped with the release, and the release outside is rolled up there is the second coil, and first coil and second coil electric connection, and the magnetization end of release sets up in the one side that is close to armature, one side that the release was kept away from to the protecting sheathing is equipped with the switch, and the inner of switch articulates there is the traction member, and the other end of traction member is articulated mutually with the one end that the linkage curved bar spare kept away from the release.

Preferably, the linkage curved rod piece is respectively connected with a pair of shifting rods in a switching mode corresponding to the upper ends of the two elastic breaking contact pieces, the two shifting rods in each pair of shifting rods are respectively attached to two sides of the elastic breaking contact pieces in a rolling mode, and a ceramic insulating sleeve is sleeved outside the shifting rods.

Preferably, the replaceable fuse component comprises a fuse socket arranged in the protection shell, the protection shell is located between the electric wire connecting contact and the output contact and is provided with a lateral sliding cavity, the fuse socket is inserted along the opening on one side of the lateral sliding cavity in a matched mode, the middle of the fuse socket is provided with fuse card cavities corresponding to the positions of the pair of electric wire connecting contacts and the pair of output contacts, fuses are arranged in the fuse card cavities in a matched mode, fuse contact ends at the upper ends of the two fuses are respectively in electrical contact with the corresponding electric wire connecting contacts, and fuse contact ends at the lower ends of the two fuses are respectively in electrical contact with the corresponding output contacts.

Preferably, the outer end of the fuse socket is provided with a bolt fixing hole seat, and the bolt fixing hole seat arranged on the fuse socket is fixed on the protective casing through a bolt.

Preferably, one side of the bottom of the protective casing is provided with an air inlet, the side wall of the protective casing is provided with an air outlet, and the openings of the air inlet and the air outlet are respectively provided with a dustproof filter screen.

Preferably, the port close to the inner side of the air inlet is connected with a cooling fan, and an air guide assembly is arranged above the cooling fan.

Preferably, the air guide assembly is composed of a plurality of air guide plates fixed inside the protective casing, and the plurality of air guide plates are obliquely or vertically guided to each direction inside the protective casing.

Preferably, the alarm is arranged above the release, the input end of the alarm is electrically connected with the second coil wound on the release, the whistle alarm and the warning lamp are integrated on the alarm, and the warning lamp is arranged outside the protective shell.

The invention has the technical effects and advantages that:

1. when electric leakage or human electric shock occurs IN an electric appliance, IL is not equal to IN, magnetic fields IN the zero sequence mutual inductors cannot be mutually counteracted, induced voltage exists IN the first coil, current passes through the second coil, at the moment, the tripper is magnetized to attract the armature, so that the upper ends of the two elastic breaking contact pieces are pulled by the linkage curved rod piece to be separated from the input contact piece, the switch is disconnected, a power supply is cut off, and the protection effect is achieved;

2. when the fuse is fused, the bolt for fixing the fuse socket is disassembled, then the fuse socket is pulled and taken out, the fuse clamped in the fuse socket can be replaced, then the fuse socket is inserted into the lateral sliding cavity of the protective shell again, the fuse is enabled to conduct circuit connection on the two pairs of wire connecting contact pieces and the output contact pieces again, the integral shell does not need to be disassembled, and the fuse is replaced simply and conveniently;

3. the invention sucks external cold air under the work of the cooling fan, and the cold air is guided by each air guide sheet in the air guide assembly, and the plurality of air guide sheets in the air guide assembly are guided to each direction in the protective shell in an oblique or vertical direction, so that the external air can be guided to each part in the protective shell, and comprehensive and effective cooling is realized.

Drawings

Fig. 1 is a half-sectional view 1 of a three-dimensional structure of the present invention.

Fig. 2 is a half-sectional view 2 of the three-dimensional structure of the present invention.

Fig. 3 is a front sectional view of the structure of the present invention when it is open.

Fig. 4 is a front sectional view of the structure of the present invention in a closed circuit.

FIG. 5 is a front sectional view of the fuse socket of the present invention after removal.

In the figure: 1. a protective housing; 2. an input connecting terminal; 201. an input contact piece; 3. an elastic breaking contact piece; 4. an electric wire; 401. the wire is connected with the contact piece; 5. a zero sequence transformer; 6. a fuse socket; 7. a fuse; 701. a fuse contact; 8. an output terminal; 801. an output contact piece; 9. a release; 10. linking the curved rod pieces; 1001. an armature; 1002. a deflector rod; 1003. a torsion spring; 11. a switch; 12. a traction bar; 13. an alarm; 14. a heat radiation fan; 1401. an air inlet; 15. an air guide assembly; 16. an air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a device for emergency circuit protection as shown in fig. 1-5, which comprises a protective casing 1, a pair of input connection terminals 2 are arranged at the upper end of the protective casing 1, the input connection terminals are respectively terminals of a live wire L and a zero wire N, two input connection terminals 2 are respectively electrically connected with an input contact sheet 201, the inner end of the input contact sheet 201 extends into the protective casing 1, a pair of elastic breaking contact sheets 3 are respectively arranged at the lower ends corresponding to the two input contact sheets 201, the lower ends of the two elastic breaking contact sheets 3 are respectively connected with an electric wire 4, the lower end of the electric wire 4 is connected with a fixed electric wire connecting contact sheet 401, a pair of output connection terminals 8 are arranged at the lower end of the protective casing 1, two output connection terminals 8 are respectively and electrically connected with an output contact sheet 801, the inner end of the output contact sheet 801 extends into the protective casing 1, and the two output contact sheets 801 and the two electric wire connecting contact sheets 401 are connected by a replaceable fuse component, a linkage curved rod piece 10 is arranged on one side corresponding to the upper end positions of the two elastic breaking contact pieces 3, the linkage curved rod piece 10 is connected with one side of the elastic breaking contact pieces 3 through a pin, a shifting rod 1002 is arranged on the linkage curved rod piece 10, the shifting rod 1002 pulls the upper ends of the two elastic breaking contact pieces 3, a torsion spring 1003 is arranged at the connection position of the linkage curved rod piece 10 and the pin, the shifting rod 1002 on the linkage curved rod piece 10 pulls the upper ends of the two elastic breaking contact pieces 3 under the elastic action of the torsion spring 1003 to ensure that the upper ends of the two elastic breaking contact pieces 3 are contacted and electrified with the corresponding input contact piece 201, wherein the position of the linkage curved rod piece 10 corresponding to the upper ends of the two elastic breaking contact pieces 3 is connected with a pair of shifting rods 1002 in a switching way, the two shifting rods 1002 in each pair of shifting rods 1002 respectively roll and attach to the two sides of the elastic breaking contact pieces 3, and the abrasion to the elastic breaking contact pieces 3 is reduced during the shifting of the shifting rods 1002 to the elastic breaking contact pieces 3, the outside cover of driving lever 1002 is equipped with the ceramic insulation cover, plays good insulating effect simultaneously.

Referring to fig. 1 and 3, an armature 1001 is fixed to one end of the linkage curved rod 10 away from the elastic breaking contact piece 3, two electric wires 4 pass through the middle of the zero sequence transformer 5, a first coil is wound outside the zero sequence transformer 5, a release 9 is arranged on one side of the armature 1001, a second coil is wound outside the release 9, the first coil is electrically connected with the second coil, and a magnetization end of the release 9 is arranged on one side close to the armature 1001, as shown IN fig. 3, when the switch is IN a closed state, IL = IN, but the directions are opposite, magnetic fields generated IN the zero sequence transformer 5 are mutually cancelled, no induced voltage exists IN the first coil, and no current exists IN the second coil; as shown IN fig. 3, when an electric appliance leaks electricity or a person gets an electric shock, IL ≠ IN, the magnetic fields IN the zero sequence transformer 5 cannot be cancelled each other, there is induced voltage IN the first coil, there is current passing IN the second coil, the tripper 9 is magnetized to attract the armature 1001 at this time, thereby the upper ends of the two elastic breaking contacts 3 are pulled by the linkage curved rod 10 to be separated from the input contact 201, the switch disconnection is realized, the power supply is cut off, the protection effect is achieved, one side of the protection case 1, which is far away from the tripper 9, is provided with the switch 11, the inner end of the switch 11 is hinged with the traction rod 12, the other end of the traction rod 12 is hinged with one end of the linkage curved rod 10, which is far away from the tripper 9, and the power supply switch can be opened and closed by manual operation.

Be located the top of release 9 and be equipped with attention device 13, the second coil electric connection of winding on the input of attention device 13 and the release 9, the collection whistle siren and warning light on the attention device 13, the warning light sets up IN protection casing 1's outside, when above-mentioned electrical apparatus electric leakage or people electrocute, IL ≠ IN, magnetic field can not offset each other IN the zero sequence transformer 5, there is induced voltage IN the first coil, there is the electric current to pass through IN the second coil, supply electric power to attention device 13 by the second coil, make the collection whistle siren send out the alarm sound on the attention device 13, and the warning light flickers.

The replaceable fuse component comprises a fuse socket 6 arranged in a protective shell 1, wherein a side sliding cavity is arranged between an electric wire connecting contact piece 401 and an output contact piece 801 of the protective shell 1, the fuse socket 6 is inserted along an opening on one side of the side sliding cavity in a matching way, fuse card cavities are arranged in the middle of the fuse socket 6 corresponding to the positions of the electric wire connecting contact pieces 401 and the output contact pieces 801, fuses 7 are arranged in the fuse card cavities in a matching way, when the fuse socket 6 is completely inserted, fuse contact ends 701 at the upper ends of the two fuses 7 are respectively in electric contact with the corresponding electric wire connecting contact pieces 401, fuse contact ends 701 at the lower ends of the two fuses 7 are respectively in electric contact with the corresponding output contact pieces 801, so that circuits are communicated, bolt fixing hole seats are arranged at the outer ends of the fuse socket 6, and the bolt fixing hole seats arranged on the fuse socket 6 are fixed on the protective shell 1 through bolts, when fuse 7 takes place the fusing, through the bolt of dismantling fixed fuse socket 6, take out fuse socket 6 pull after that, can change the fuse 7 of card establishment in the fuse socket 6, insert the fuse socket 6 again in the chamber that sideslips of protection casing 1, make fuse 7 again to two pairs of connection of electric lines contact 401, output contact 801 carry out the circuit switch-on can, both need not to dismantle whole casing, and it is simple convenient to the change of fuse 7 moreover.

Referring to fig. 2 and 4, an air inlet 1401 is disposed at one side of the bottom of the protection casing 1, an air outlet 16 is disposed at a side wall of the protection casing 1 for dissipating heat generated by the unit in the protection casing 1 during operation through air circulation, dust-proof filter screens are disposed at openings of the air inlet 1401 and the air outlet 16 to prevent dust in the outside air from entering the protection casing 1, a heat dissipation fan 14 is connected to an inner side port close to the air inlet 1401, an air guide assembly 15 is disposed above the heat dissipation fan 14, the air guide assembly 15 is composed of a plurality of air guide plates fixed in the protection casing 1, the plurality of air guide plates are obliquely or vertically oriented to each direction in the protection casing 1, and under the operation of the heat dissipation fan 14 and the action of each air guide plate in the air guide assembly 15, the outside air is guided to each position in the protection casing 1 to achieve comprehensive effect, And (3) effective heat dissipation.

The working principle of the invention is as follows: when the invention is used, when an electric appliance leaks electricity or an electric shock occurs, IL is not equal to IN, magnetic fields IN the zero sequence mutual inductor 5 can not be mutually counteracted, induced voltage exists IN the first coil, current passes through the second coil, and at the moment, the tripper 9 is magnetized to attract the armature 1001, so that the upper ends of the two elastic breaking contact pieces 3 are pulled by the linkage curved rod piece 10 to be separated from the input contact piece 201, the switch is disconnected, the power supply is cut off, and the protection effect is achieved;

when the fuse 7 is fused, the bolt for fixing the fuse socket 6 is detached, then the fuse socket 6 is pulled and taken out, the fuse 7 clamped in the fuse socket 6 can be replaced, then the fuse socket 6 is inserted into the sideslip cavity of the protective case 1 again, and the fuse 7 is enabled to conduct circuit connection on the two pairs of electric wire connecting contact pieces 401 and the output contact piece 801 again, so that the integral case does not need to be detached, and the fuse 7 is replaced simply and conveniently;

the invention sucks external cold air under the work of the cooling fan 14, and the cold air is guided by each air guide sheet in the air guide assembly 15, and the plurality of air guide sheets in the air guide assembly 15 are guided to each direction in the protection casing 1 in an oblique or vertical direction, so that the external air can be guided to each part in the protection casing 1, and comprehensive and effective heat dissipation is realized.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A device for emergency protection of an electric circuit, comprising a protective casing (1), characterized in that: the upper end of the protection casing (1) is provided with a pair of input connecting terminals (2), the two input connecting terminals (2) are respectively and electrically connected with input contact pieces (201), the inner ends of the input contact pieces (201) extend into the protection casing (1), the lower ends corresponding to the two input contact pieces (201) are respectively provided with a pair of elastic breaking contact pieces (3), the lower ends of the two elastic breaking contact pieces (3) are respectively connected with electric wires (4), the lower ends of the electric wires (4) are connected with fixed electric wire connecting contact pieces (401), the lower end of the protection casing (1) is provided with a pair of output connecting terminals (8), the two output connecting terminals (8) are respectively and electrically connected with output contact pieces (801), the inner ends of the output contact pieces (801) extend into the protection casing (1), and the two output contact pieces (801) are connected with the two electric wire connecting contact pieces (401) through replaceable fuse components, a linkage curved rod piece (10) is arranged on one side of the upper end positions of the two elastic breaking contact pieces (3), the linkage curved rod piece (10) is connected to one side of the elastic breaking contact pieces (3) in a rotating mode through a pin, a shifting rod (1002) is arranged on the linkage curved rod piece (10), the shifting rod (1002) pulls the upper ends of the two elastic breaking contact pieces (3), a torsion spring (1003) is arranged at the connecting position of the linkage curved rod piece (10) and the pin, an armature (1001) is fixed at one end, far away from the elastic breaking contact pieces (3), of the linkage curved rod piece (10), the two electric wires (4) penetrate through the middle of the zero sequence transformer (5), a first coil is wound outside the zero sequence transformer (5), a release (9) is arranged on one side of the armature (1001), a second coil is wound outside the release (9), the first coil is electrically connected with the second coil, and the magnetization end of the release (9) is arranged on one side close to the armature (1001), one side of the protection casing (1) far away from the tripper (9) is provided with a switch (11), the inner end of the switch (11) is hinged with a traction rod piece (12), and the other end of the traction rod piece (12) is hinged with one end of a linkage curved rod piece (10) far away from the tripper (9).

2. An apparatus for circuit emergency protection according to claim 1, wherein: the linkage curved rod piece (10) is provided with a pair of shifting rods (1002) corresponding to the upper ends of the two elastic breaking contact pieces (3) in a switching mode, the two shifting rods (1002) in each pair of shifting rods (1002) are respectively attached to the two sides of the elastic breaking contact pieces (3) in a rolling mode, and a ceramic insulating sleeve is sleeved outside each shifting rod (1002).

3. An apparatus for circuit emergency protection according to claim 1, wherein: the replaceable fuse component comprises a fuse socket (6) arranged inside a protection shell (1), the protection shell (1) is located between an electric wire connecting contact piece (401) and an output contact piece (801) and is provided with a side sliding cavity, the fuse socket (6) is inserted in a matched mode along an opening in one side of the side sliding cavity, fuse card cavities are formed in the positions, corresponding to the electric wire connecting contact pieces (401) and the output contact pieces (801), of the middle of the fuse socket (6), fuses (7) are arranged in the fuse card cavities in a matched mode, fuse contact ends (701) at the upper ends of the two fuses (7) are in electrical contact with the corresponding electric wire connecting contact pieces (401), and fuse contact ends (701) at the lower ends of the two fuses (7) are in electrical contact with the corresponding output contact pieces (801).

4. An apparatus for circuit emergency protection according to claim 3, wherein: the outer end of the fuse socket (6) is provided with a bolt fixing hole seat, and the bolt fixing hole seat arranged on the fuse socket (6) is fixed on the protective casing (1) through a bolt.

5. An apparatus for circuit emergency protection according to claim 1, wherein: an air inlet (1401) is formed in one side of the bottom of the protective casing (1), an air outlet (16) is formed in the side wall of the protective casing (1), and dustproof filter screens are arranged at openings of the air inlet (1401) and the air outlet (16).

6. An apparatus for circuit emergency protection according to claim 5, wherein: and a heat radiation fan (14) is connected to the port of the inner side close to the air inlet (1401), and an air guide assembly is arranged above the heat radiation fan (14).

7. An apparatus for circuit emergency protection according to claim 6, wherein: the air guide assembly (15) is composed of a plurality of air guide sheets fixed inside the protective casing (1), and the plurality of air guide sheets are obliquely or vertically guided to all directions inside the protective casing (1).

8. An apparatus for circuit emergency protection according to claim 1, wherein: the protection device is characterized in that a warning device (13) is arranged above the tripper (9), the input end of the warning device (13) is electrically connected with a second coil wound on the tripper (9), a whistle alarm and a warning lamp are integrated on the warning device (13), and the warning lamp is arranged outside the protection shell (1).