CN112164640A

CN112164640A - Circuit overload protection device

Info

Publication number: CN112164640A
Application number: CN202011148927.1A
Authority: CN
Inventors: 于亚美; 何偏偏
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-01-01

Abstract

The invention discloses a circuit overload protection device which comprises a hollow device shell, wherein two exhaust holes and two air inlet holes are formed in the device shell, a plurality of heat conducting fins are arranged on the inner side wall of the device shell, first pressure relief valves are arranged in the exhaust holes, plugging devices are arranged in the exhaust holes, a second sliding groove is formed in the side wall of the device shell, a mounting plate is bonded in the second sliding groove, a magnetic plate is hermetically and slidably sleeved in the second sliding groove, a third spring is fixedly connected between the magnetic plate and the mounting plate, and conducting strips are bonded on the side wall, close to the magnetic plate, of the mounting plate. Has the advantages that: the overload protection device can allow the circuit to be overloaded for a period of time in a small scale, is powered off after a certain period of time, automatically recovers, is more suitable for actual use conditions, can directly cut off the circuit when the circuit is overloaded in a large scale, ensures the safety of the circuit, and has good heat dissipation performance.

Description

Circuit overload protection device

Technical Field

The invention relates to the technical field of power equipment, in particular to a circuit overload protection device.

Background

Electricity is an indispensable energy in our life, no matter in production and life, all need the electric energy to provide the energy for equipment, with the increase of the electrical apparatus quantity in the circuit, the load of circuit increases gradually, and the circuit once transships, the electric current will appear too big, and consumer generates heat, and circuit overload can reduce circuit insulation level for a long time, burns out equipment or circuit even, therefore generally all can be provided with overload protection device in the circuit to prevent that the circuit from transshipping.

In the prior art, the existing overload protection device can cut off a circuit immediately once the circuit is overloaded, and in the actual use process, after an electrical appliance is added, the circuit is slightly overloaded, the circuit cannot be influenced after the circuit is slightly overloaded for a period of time, the circuit can be slightly overloaded within a certain time, and the existing overload protection device can cut off the circuit immediately, so that inconvenience is brought to the actual use process. To this end, we propose a circuit overload protection device.

Disclosure of Invention

The invention aims to solve the problem that an overload protection device in the prior art does not allow a circuit to be overloaded in a small amplitude, and provides the overload protection device for the circuit.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a circuit overload protection device, includes hollow device shell, set up two exhaust holes and inlet port in the device shell, the device shell inside wall is provided with a plurality of conducting strips, it is provided with first relief valve to exhaust to go out the downthehole plugging device that is provided with, the second sliding tray has been seted up to device shell lateral wall, it has the mounting panel to bond in the second sliding tray, and the sealed slip of second sliding tray has cup jointed the magnetic sheet, fixedly connected with third spring between magnetic sheet and the mounting panel, the mounting panel all bonds with the lateral wall of the nearly one side of magnetic sheet and has the conducting strip, be provided with time delay power-off device in the device shell.

In foretell circuit overload protection device, plugging device is in including seting up the first sliding tray and the setting in the exhaust hole inside wall the first electro-magnet in the device shell, the shrouding has been cup jointed in sliding in the first sliding tray, fixedly connected with first spring between shrouding and the device shell.

In the circuit overload protection device, the delayed power-off device comprises an air inlet cavity arranged in a device shell, a sliding plate is sleeved in the air inlet cavity in a sealing sliding mode, the air inlet cavity is communicated with a cavity of the device shell, an annular baffle is bonded in the air inlet cavity, a plurality of second springs are fixedly connected between the annular baffle and the sliding plate, a second pressure release valve is arranged in the air inlet cavity, an air collection chamber is arranged in the device shell and is communicated with the air inlet cavity, a communication cavity is arranged in the device shell and is communicated with the air collection chamber and a second sliding groove, a third pressure release valve is arranged in the communication cavity, and an instant power-off mechanism is arranged in the second sliding groove.

In the circuit overload protection device, the immediate power-off mechanism comprises a second electromagnet arranged in a second sliding groove, piezoelectric ceramics are bonded on the inner side wall of the air inlet cavity, and the piezoelectric ceramics are electrically connected with the second electromagnet through a lead.

In the circuit overload protection device, the side wall of the magnetic plate is slidably sleeved with a plurality of stop blocks through a third sliding groove, a fourth spring is fixedly connected between the stop blocks and the magnetic plate, the magnetic plate is provided with a plurality of through holes, and an insulating block is bonded on the side wall of the magnetic plate, which is far away from the mounting plate.

Compared with the prior art, the invention has the advantages that:

1. when the circuit is overloaded slightly, the magnetic force of the first electromagnet on the sealing plate overcomes the elastic force of the first spring, so that the sealing plate plugs the exhaust hole, certain heat is generated due to overload, the temperature in the shell of the device rises, the internal air expands, when the internal pressure reaches the critical value of the second pressure release valve, the second pressure release valve is opened, so that air enters the air inlet cavity, the sliding plate is jacked up to enter the air collection chamber, along with the increase of small overload time, the gas in the air collection chamber continuously increases, the pressure continuously increases, when the pressure in the air collection chamber reaches the critical value of the third pressure release valve, the air in the air collection chamber enters the second sliding groove through the communication cavity, and because the aperture of the through hole on the magnetic plate is small, the air with pressure can jack up the magnetic plate, so that the conducting strips are separated, the circuit is cut off, and after the magnetic plate is jacked up, the air is continuously discharged, under the action of the elastic force of the third spring, the magnetic plate is reset slowly, and when the conducting strips are contacted, the circuit is switched on again, so that the overload protection device can allow the circuit to be overloaded for a period of time in a small amplitude, and can be switched on automatically after the circuit is switched off after a period of time, and is more humanized in the actual use process;

2. when the circuit is greatly and seriously overloaded, after the vent hole is blocked, the heat inside the shell of the device instantly reaches very high, at the moment when the second pressure release valve is opened, the high-pressure air enables the sliding plate to instantly bounce and impact piezoelectric ceramics, the piezoelectric ceramics generates instant high pressure, the second electromagnet is electrified to generate magnetic force, the magnetic plate instantly bounces out of the sliding groove under the magnetic force action of the second electromagnet, the stop dog bounces out of the second sliding groove under the elastic force action of the fourth spring while the magnetic plate bounces out of the second sliding groove, and the stop dog is clamped at the side wall of the shell of the device, so that the magnetic plate cannot reset under the elastic force action of the third spring, the circuit is immediately cut off when the circuit is greatly overloaded, manual reset is required, the circuit cannot be automatically switched on, the damage to the circuit caused by;

3. when the normal working process of circuit, the elasticity of first spring can't be overcome to the magnetic force of shrouding to first electro-magnet, the shrouding is in first sliding tray all the time, the exhaust hole is open, along with the inside temperature of device constantly risees in the use, the inside air pressure of device shell constantly increases, when the critical value of pressure increase to first relief valve, first relief valve is opened, inside hot-air is discharged from the exhaust hole, inside the lower air of outside temperature gets into the device shell from the inlet port simultaneously, realize the heat dissipation that the air flows, make the device can guarantee good heat dissipation in the use.

Drawings

Fig. 1 is a schematic structural diagram of a circuit overload protection apparatus according to the present invention;

fig. 2 is an enlarged view of a circuit overload protection apparatus according to the present invention at a point a;

fig. 3 is an enlarged view of a circuit overload protection apparatus according to the present invention at B;

fig. 4 is a schematic diagram of a circuit overload protection apparatus according to the present invention in a power-off state.

In the figure: the device comprises a device shell 1, an exhaust hole 2, a first pressure release valve 21, a first sliding groove 22, a sealing plate 23, a first spring 24, a first electromagnet 25, an air inlet hole 3, a heat conducting sheet 41, an air inlet cavity 5, a second pressure release valve 51, piezoelectric ceramics 52, a second electromagnet 53, a ring baffle 6, a second spring 7, a sliding plate 8, an air collection chamber 9, a communicating cavity 91, a third pressure release valve 92, a second sliding groove 10, a mounting plate 11, a magnetic plate 12, a through hole 121, a third sliding groove 122, a stop block 123, a fourth spring 124, a third spring 13, a conducting sheet 14 and an insulating block 15.

Detailed Description

The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Examples

Referring to fig. 1-4, a circuit overload protection device, including hollow device shell 1, device shell 1 has seted up two exhaust holes 2 and inlet port 3, device shell 1 inside wall is provided with a plurality of conducting strips 41, be provided with first relief valve 21 in the exhaust hole 2, be provided with plugging device in the exhaust hole 2, device shell 1 lateral wall has seted up second sliding tray 10, it has mounting panel 11 to bond in the second sliding tray 10, sealed sliding sleeve has magnetic sheet 12 in the second sliding tray 10, fixedly connected with third spring 13 between magnetic sheet 12 and the mounting panel 11, mounting panel 11 all bonds conducting strip 14 with the lateral wall of the close one side of magnetic sheet 12, be provided with the time delay outage device in the device shell 1.

Plugging device is including offering at the first sliding tray 22 of 2 inside walls in exhaust hole and setting up the first electro-magnet 25 in device shell 1, sliding sleeve has shrouding 23 in first sliding tray 22, the first spring 24 of fixedly connected with between shrouding 23 and the device shell 1, shrouding 23 is metal material panel, when the circuit does not have the overload condition, first electro-magnet 25 is not enough to overcome first spring 24 elasticity to shrouding 23 magnetic force, shrouding 23 does not produce and removes, when the circuit transships, the current increase, first spring 24 elasticity is overcome to the magnetic force of shrouding 23 to first electro-magnet 25, make the first sliding tray 22 of shrouding 23 roll-off, 2 shutoff in the exhaust hole.

The delayed power-off device comprises an air inlet cavity 5 arranged in a device shell 1, a sliding plate 8 is sleeved on the air inlet cavity 5 in a sealing sliding mode, the air inlet cavity 5 is communicated with a cavity of the device shell 1, an annular baffle 6 is bonded in the air inlet cavity 5, a plurality of second springs 7 are fixedly connected between the annular baffle 6 and the sliding plate 8, a second pressure release valve 51 is arranged in the air inlet cavity 5, the second pressure release valve 51 is arranged on the left side of the annular baffle 6, an air collection chamber 9 is arranged in the device shell 1, the air collection chamber 9 is communicated with the air inlet cavity 5, the communication position of the air collection chamber 9 and the air inlet cavity 5 is positioned on the right side of the sliding plate 8, when air enters the air inlet cavity 5, the sliding plate is firstly jacked up and then enters the air collection chamber 9, a communication cavity 91 is arranged in the device shell 1, the communication cavity 91 is communicated with, the third pressure release valve 92 is arranged in the communicating cavity 91, the instant power-off mechanism is arranged in the second sliding groove 10, when a circuit is overloaded to a small extent, the exhaust hole 2 is closed, the gas pressure is increased along with the temperature rise, the gas enters the air inlet cavity 5 through the second pressure release valve 51, the sliding plate 8 is jacked up firstly, and the heat generated by the large overload due to the small overload is less, so that the sliding plate 8 cannot be contacted with the piezoelectric ceramic 52 after being jacked up by the pressure generated by the small overload, the second electromagnet 53 cannot generate magnetic force on the magnetic plate 12, even if weak collision exists, the voltage generated by the piezoelectric ceramic 52 is less, the magnetic force of the second electromagnet 53 on the magnetic plate 12 is weaker, the elastic force of the third spring 13 cannot be overcome, the magnetic plate 12 cannot move, the conducting strips 14 cannot be separated, and the device can allow the small overload.

The instant power-off mechanism comprises a second electromagnet 53 arranged in the second sliding groove 10, piezoelectric ceramics 52 are bonded on the inner side wall of the air inlet cavity 5, and the piezoelectric ceramics 52 and the second electromagnet 53 are electrically connected through a lead.

The lateral wall of magnetic plate 12 has cup jointed a plurality of dogs 123 through the slip of third sliding tray 122, fixedly connected with fourth spring 124 between dog 123 and the magnetic plate 12, a plurality of through-holes 121 have been seted up to magnetic plate 12, the aperture of through-hole 121 is less, when the gas that has pressure gets into between mounting panel 11 and the magnetic plate 12, can jack-up mounting panel 12, after the jack-up, can be under the effect of third spring 13 elasticity, slow reset, the lateral wall that magnetic plate 12 kept away from mounting panel 11 one side bonds has insulating block 15, insulating block 15 guarantees the safety when manual reset magnetic plate 12, avoid electrocuteeing, set up and the check valve in the inlet port 3, only allow the air to pass through in the inlet port 3 gets into device shell 1.

In the invention, in the normal use process of the circuit, heat generated in the device is transferred into the cavity of the device shell 1 through the heat conducting sheet 41, so that the temperature in the cavity is gradually increased, the internal pressure is continuously increased, when the temperature is increased to the critical value of the first pressure release valve 21, the first pressure release valve 21 is opened, the air with heat in the cavity is discharged, and meanwhile, the air with lower external temperature passes through the air inlet 3 to finish air flowing heat dissipation;

when the circuit is overloaded slightly, the current in the circuit is increased due to overload, the magnetic force of the first electromagnet 25 on the sealing plate 23 overcomes the elastic force of the first spring 24, the sealing plate 23 slides out of the first sliding groove 22, the exhaust hole 2 is blocked, and the overload can cause the device to generate more heat, so that the temperature in the cavity of the device shell 1 is continuously increased, the pressure is gradually increased, when the temperature is increased to the critical value of the second pressure release valve 51, the second pressure release valve 51 is opened, air enters the air inlet cavity 5, the air with certain pressure jacks up the sliding plate 8, after jacking, the air enters the air collection chamber 9, meanwhile, the outside air is supplemented into the device shell 1 through the air inlet hole 3, and it can be seen that the device can absorb the air with lower outside temperature to dissipate heat for the device no matter whether the overload occurs, so that the overload protection device of the invention is in a heat dissipation state all the time, the protection device is used for opening the second pressure release valve 51 again along with the rise of the temperature again, air enters the air collection chamber 9, the pressure is increased continuously along with the increase of the air in the air collection chamber 9, when the critical value of the third pressure release valve 92 is reached, the third pressure release valve 92 is opened, the air with certain pressure enters the second sliding groove 10 through the communication cavity 91, the magnetic plate 12 can be jacked up due to the fact that the aperture of the through hole 121 is extremely small, but the magnetic plate 12 cannot be jacked out of the second sliding groove 10, after the magnetic plate 12 is jacked up, the conducting strips 14 are separated, the circuit is cut off, under the action of the elastic force of the third spring 13, the magnetic plate 12 is slowly restored to the original position, and the circuit is;

when the circuit is overloaded momentarily and greatly, the exhaust hole 2 is closed by the closing plate 23, at this time, the circuit generates a large amount of heat, so that the internal temperature of the device housing 1 rises momentarily to be high, the internal pressure increases momentarily, so that the second pressure release valve 51 is opened, the sliding plate 8 is subjected to a strong impact force by the air with a large pressure, the piezoelectric ceramic 52 is struck momentarily to generate a large voltage, the second electromagnet 53 is energized to generate a large magnetic force, the elastic force of the third spring 13 is overcome, the magnetic plate 12 is ejected out of the second sliding groove 10 momentarily under the action of the strong magnetic force, when the magnetic plate 12 is ejected out of the second sliding groove 10, the stopper 123 slides out of the third sliding groove 122 under the action of the elastic force of the fourth spring 124, so that the magnetic plate 12 cannot enter the second sliding groove 10 again, the circuit is cut off and the circuit cannot be automatically connected, and after the overload processing is completed, the stopper 123 is pressed into, and the insulation block 15 is pressed to contact the conductive sheet 14 to turn on the power.

Although terms such as the apparatus housing 1, the exhaust hole 2, the first relief valve 21, the first sliding groove 22, the closing plate 23, the first spring 24, the first electromagnet 25, the intake hole 3, the heat conductive sheet 41, the intake chamber 5, the second relief valve 51, the piezoceramic 52, the second electromagnet 53, the annular baffle 6, the second spring 7, the sliding plate 8, the gas collection chamber 9, the communication chamber 91, the third relief valve 92, the second sliding groove 10, the mounting plate 11, the magnetic plate 12, the through hole 121, the third sliding groove 122, the stopper 123, the fourth spring 124, the third spring 13, the conductive sheet 14, the insulating block 15, and the like are used more frequently herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A circuit overload protection device comprises a hollow device shell (1) and is characterized in that, two exhaust holes (2) and air inlet holes (3) are arranged in the device shell (1), a plurality of heat conducting fins (41) are arranged on the inner side wall of the device shell (1), a first pressure release valve (21) is arranged in the exhaust hole (2), a plugging device is arranged in the exhaust hole (2), a second sliding groove (10) is arranged on the side wall of the device shell (1), an installation plate (11) is bonded in the second sliding groove (10), a magnetic plate (12) is hermetically sleeved in the second sliding groove (10) in a sliding way, a third spring (13) is fixedly connected between the magnetic plate (12) and the mounting plate (11), the side wall of one side of the mounting plate (11) close to the magnetic plate (12) is bonded with a conducting plate (14), and a time delay power-off device is arranged in the device shell (1).

2. The circuit overload protection device according to claim 1, wherein the blocking device comprises a first sliding groove (22) formed in the inner side wall of the exhaust hole (2) and a first electromagnet (25) arranged in the device housing (1), a sealing plate (23) is sleeved in the first sliding groove (22) in a sliding manner, and a first spring (24) is fixedly connected between the sealing plate (23) and the device housing (1).

3. The circuit overload protection device according to claim 1, wherein the delayed power-off device comprises an air inlet cavity (5) formed in a device housing (1), the air inlet cavity (5) is hermetically and slidably sleeved with a sliding plate (8), the air inlet cavity (5) is communicated with a cavity of the device housing (1), an annular baffle (6) is bonded in the air inlet cavity (5), a plurality of second springs (7) are fixedly connected between the annular baffle (6) and the sliding plate (8), a second pressure relief valve (51) is arranged in the air inlet cavity (5), an air collection chamber (9) is formed in the device housing (1), the air collection chamber (9) is communicated with the air inlet cavity (5), a communication cavity (91) is formed in the device housing (1), and the communication cavity (91) is communicated with the air collection chamber (9) and a second sliding groove (10), a third pressure release valve (92) is arranged in the communicating cavity (91), and an instant power-off mechanism is arranged in the second sliding groove (10).

4. The circuit overload protection device according to claim 3, wherein the instantaneous power-off mechanism comprises a second electromagnet (53) arranged in the second sliding groove (10), piezoelectric ceramics (52) are bonded on the inner side wall of the air inlet cavity (5), and the piezoelectric ceramics (52) and the second electromagnet (53) are electrically connected through a lead.

5. The circuit overload protection device according to claim 1, wherein a plurality of stoppers (123) are slidably sleeved on the side wall of the magnetic plate (12) through a third sliding groove (122), a fourth spring (124) is fixedly connected between the stoppers (123) and the magnetic plate (12), a plurality of through holes (121) are formed in the magnetic plate (12), and an insulating block (15) is bonded on the side wall of the magnetic plate (12) far away from the mounting plate (11).