CN112435906A

CN112435906A - Indirect thermal overload protection device for current circuit

Info

Publication number: CN112435906A
Application number: CN202011363962.5A
Authority: CN
Inventors: 彭博; 杨再星; 尹佳旺
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-03-02

Abstract

The invention relates to the technical field of circuit protection devices, and discloses a current circuit indirect type thermal overload protection device which comprises a lead part, wherein two sides of the lead part are respectively provided with a symmetrical starting groove, the inner side of each starting groove is fixedly connected with a first spring, the outer side of each first spring is fixedly connected with a starting block, the inner part of each starting block is fixedly connected with a dielectric plate, the inner side of each starting groove is movably connected with an air bag, and two sides of the lead part are respectively fixedly connected with symmetrical heat conducting fins. This indirect hot overload protection device of current circuit, through gasbag and conducting strip interact, when the product was overheated, the conducting strip absorbed heat and transmits and makes the gasbag inside gas be heated the inflation and thereby drive the start piece and overcome two elasticity effects of spring and remove, make piezoelectric crystal work, the electro-magnet circuit switch-on, the electro-magnet produces the magnetic field and drives the fixture block and remove the connection between wire portion and the control lever, make spread groove and connection key separate under the effect of spring two, realized overheat protection's function.

Description

Indirect thermal overload protection device for current circuit

Technical Field

The invention relates to the technical field of circuit protection devices, in particular to a current circuit indirect thermal overload protection device.

Background

Along with the progress of science and technology and the development of society, people's electrical equipment that uses is more and more, so the circuit requirement to electrical equipment also increases thereupon, in electrical equipment's use, often can appear the overheated phenomenon of circuit, if continuously make electrical equipment work under the overheated condition, can make the internal circuit of equipment destroy, even arouse the condition of conflagration, caused unpredictable loss for the user, be unfavorable for user's use.

In the use of electrical equipment, because the fluctuation of current and voltage in the circuit can lead to the circuit overload operation for the heat that produces surpasss heat-sinking capability, makes equipment overheated, or because of electrical equipment's misuse, leads to the load that adds on equipment to exceed normal operating range, makes the equipment internal circuit heat production surge, has surpassed normal heat-sinking capability, thereby leads to the electrical apparatus damage, so ordinary circuit can not satisfy user's user demand yet.

Therefore, we propose an indirect thermal overload protection device for current circuit to solve the above problem.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a current circuit indirect type thermal overload protection device which has the advantages of an automatic power-off protection circuit when the circuit is overheated and solves the problem that the circuit is easy to overheat and damage.

(II) technical scheme

In order to realize the purpose of the automatic power-off protection circuit when the circuit is overheated, the invention provides the following technical scheme: an indirect thermal overload protection device of a current circuit comprises a lead part, wherein two sides of the lead part are respectively provided with a symmetrical starting groove, the inner side of the starting groove is fixedly connected with a first spring, the outer side of the first spring is fixedly connected with a starting block, the inner part of the starting block is fixedly connected with a dielectric plate, the inner side of the starting groove is movably connected with an air bag, two sides of the lead part are respectively fixedly connected with a symmetrical heat conducting fin, two sides of the lead part are respectively fixedly connected with a symmetrical positive plate, two sides of the lead part are respectively fixedly connected with a symmetrical negative plate, two sides of the lead part are respectively fixedly connected with a symmetrical piezoresistor, two sides of the lead part are respectively fixedly connected with a symmetrical control groove, the inner side of the control groove is fixedly connected with a second spring, the outer side of the second spring is fixedly connected with a control rod, two sides of the control, the connecting groove is formed in the left side of the wire portion, and the connecting key is fixedly connected to the right side of the wire portion.

Preferably, the wire portion includes internal circuit layer and external insulation layer, and internal circuit layer and conducting strip laminating prevent the product electric leakage, have promoted the security of product, and the conducting strip absorbs the heat temperature rise that the wire portion produced to make the gas inflation in the gasbag, drive the piece of starting and overcome a spring effect and remove, control piezo-resistor work.

Preferably, the diameter of the dielectric plate is smaller than that of the starting groove, the surface of the dielectric plate is smooth, and the bottom surface of the dielectric plate is attached to the air bag, so that the frictional resistance between the dielectric plate and the starting groove is reduced, and the movement of the dielectric plate in the starting groove is facilitated.

Preferably, the gasbag includes outside plastic film layer and inside gas, and the thermal expansion coefficient of inside gas is greater than the thermal expansion coefficient of air, and when the product was overheated, the inside gas of gasbag was heated and expanded, and the gasbag extrudees the actuator block to drive the actuator block and overcome a spring elastic action and remove, make the dielectric plate insert between positive plate and the negative plate, change the piezo-resistor both ends voltage, control piezo-resistor circular telegram work.

Preferably, the positive plate is the same with the negative plate in height, and the height that positive plate and negative plate are less than the height of dielectric plate, and removal control dielectric plate through the start block inserts to between positive plate and the negative plate, and when dielectric plate was inserted completely, positive plate and negative plate both ends voltage satisfied piezo-resistor operating voltage, piezo-resistor circular telegram work made the electro-magnet circular telegram produce magnetic field to drive the fixture block and remove the restriction between wire portion and the control lever.

Preferably, the piezoresistor is electrically connected with the negative plate and the piezoresistor is electrically connected with the electromagnet, and the piezoresistor is electrified to work to electrify the electromagnet to generate a magnetic field, so that the overheat circuit-breaking function of the product is realized, the product is prevented from being damaged, and the service life of the product is prolonged.

Preferably, the electromagnet comprises a magnetic body, a surrounding coil and a control assembly, opposite faces of the electromagnet and the permanent magnet are same in magnetism, when the electromagnet is electrified, the electromagnet generates a magnetic field, the electromagnet and the permanent magnet are mutually repelled due to the fact that the opposite faces are same in magnetism, the clamping block is driven to move, the limiting effect between the wire portion and the control rod is removed, the wire portion moves under the effect of two elastic forces of the spring, the circuit of the wire portion is disconnected, and the function of protecting the circuit is achieved.

Preferably, the connecting key is conducting material, and the inside fixedly connected with of connecting key leads electrical pillar, and the diameter of connecting key equals the diameter of spread groove, is convenient for be connected between connecting key and spread groove, realizes the normal work of product.

(III) advantageous effects

Compared with the prior art, the invention provides a current circuit indirect type thermal overload protection device, which has the following beneficial effects:

1. this indirect hot overload protection device of current circuit, through gasbag and conducting strip interact, when the product was overheated, the conducting strip absorbed heat and transmits and makes the gasbag inside gas be heated the inflation and thereby drive the start piece and overcome two elasticity effects of spring and remove, make piezoelectric crystal work, the electro-magnet circuit switch-on, the electro-magnet produces the magnetic field and drives the fixture block and remove the connection between wire portion and the control lever, make spread groove and connection key separate under the effect of spring two, realized overheat protection's function.

2. This indirect formula of current circuit thermal overload protection device, through dielectric plate and positive plate, the interact between the negative plate, when dielectric plate inserts between positive plate and the negative plate, the relative area between positive plate and the negative plate changes to make the voltage at piezo-resistor both ends rise, when the product is overheated, dielectric plate inserts completely, and piezo-resistor both ends voltage reaches operating voltage, and piezo-resistor circular telegram work switches on the electro-magnet circuit, makes the product outage, has realized product automatic control, overheat protection's function.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of a portion B of FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of a portion of portion C of FIG. 1 according to the present invention.

In the figure: 1. a wire portion; 2. starting a groove; 3. a first spring; 4. a start block; 5. a dielectric plate; 6. an air bag; 7. a heat conductive sheet; 8. a positive plate; 9. a negative plate; 10. a voltage dependent resistor; 11. a control slot; 12. a second spring; 13. a control lever; 14. a permanent magnet; 15. a chute; 16. a clamping block; 17. an electromagnet; 18. connecting grooves; 19. a connecting key.

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.

Referring to fig. 1-4, an indirect thermal overload protection device for current circuit comprises a lead portion 1, the lead portion 1 includes an internal circuit layer and an external insulation layer, the internal circuit layer is attached to a heat conductive sheet 7 to prevent leakage of electricity, and improve safety of the product, the heat conductive sheet 7 absorbs heat generated by the lead portion 1 to raise temperature, so as to expand gas in an air bag 6, drive an actuating block 4 to move against the elastic force of a spring 3, control a voltage dependent resistor 10 to work, two sides of the lead portion 1 are both provided with symmetrical actuating slots 2, the inner side of the actuating slot 2 is fixedly connected with the spring 3, the outer side of the spring 3 is fixedly connected with an actuating block 4, the inner part of the actuating block 4 is fixedly connected with a dielectric plate 5, the diameter of the dielectric plate 5 is smaller than that of the actuating slot 2, the surface of the dielectric plate 5 is smooth, the bottom surface of the dielectric plate 5 is attached to the air bag 6, and friction resistance between the dielectric plate, be convenient for the removal of dielectric plate 5 in starting groove 2, start 2 inboard swing joint in groove has gasbag 6, gasbag 6 includes outside plastic film layer and inside gas, inside gaseous thermal expansion coefficient is greater than the thermal expansion coefficient of air, when the product is overheated, the inside gaseous thermal expansion that is heated of

gasbag

6, 6 extrusion of gasbag start block 4, thereby drive start block 4 and overcome 3 elastic force of spring and move, make dielectric plate 5 insert between positive plate 8 and the negative plate 9, change piezo-resistor 10 both ends voltage, control piezo-resistor 10 circular telegram work.

Symmetrical heat conducting sheets 7 are fixedly connected to both sides of the lead portion 1, symmetrical positive plates 8 are fixedly connected to both sides of the lead portion 1, symmetrical negative plates 9 are fixedly connected to both sides of the lead portion 1, the heights of the positive plates 8 are the same as those of the negative plates 9, the heights of the positive plates 8 and the negative plates 9 are smaller than that of the dielectric plate 5, the dielectric plate 5 is controlled to be inserted between the positive plates 8 and the negative plates 9 through movement of the starting block 4, when the dielectric plate 5 is completely inserted, the voltages at both ends of the positive plates 8 and the negative plates 9 meet the working voltage of the piezoresistors 10, the piezoresistors 10 are electrified to work, the electromagnet 17 is electrified to generate a magnetic field, so as to drive the clamping block 16 to remove the limiting effect between the lead portion 1 and the control rod 13, the symmetrical piezoresistors 10 are fixedly connected to both sides of the lead portion 1, the piezoresistors 10 are electrically connected with the negative plates 9, through the work of piezo-resistor 10 circular telegram, make electro-magnet 17 circular telegram produce the magnetic field, realize the overheated function of opening circuit of product, prevent that the product is impaired, prolonged the life-span of product.

The two sides of the wire part 1 are fixedly connected with symmetrical control grooves 11, the inner side of the control groove 11 is fixedly connected with a spring II 12, the outer side of the spring II 12 is fixedly connected with a control rod 13, the two sides of the control rod 13 are fixedly connected with permanent magnets 14, the two sides of the wire part 1 are respectively provided with symmetrical sliding grooves 15, clamping blocks 16 are clamped in the sliding grooves 15, electromagnets 17 are fixedly connected in the clamping blocks 16 and comprise magnetic bodies, surrounding coils and control components, the opposite surfaces of the electromagnets 17 and the permanent magnets 14 have the same magnetism, when the electromagnets 17 are electrified, the electromagnets 17 generate magnetic fields, the electromagnets 17 and the permanent magnets 14 repel each other due to the same magnetism of the opposite surfaces, the clamping blocks 16 are driven to move, so that the limiting effect between the wire part 1 and the control rod 13 is removed, the wire part 1 moves under the action of the elastic force of the spring II 12, the circuit of the wire, spread groove 18 has been seted up on 1 left side of wire portion, 1 right side fixedly connected with of wire portion connect the key 19, connect the key 19 and be conductive material, connect the inside fixedly connected with of key 19 and lead electrical pillar, connect the diameter of key 19 and equal to the diameter of spread groove 18, be convenient for connect the key 19 and spread the connection between 18, realize the normal work of product.

The working principle is as follows: when the product normally works, the connecting key 19 is inserted in the connecting groove 18, the clamping block 16 is clamped in the clamping groove of the control rod 13, the air bag 6 does not expand, the starting block 4 cannot overcome the elastic action of the first spring 3 to move, the dielectric plate 5 is not completely inserted between the positive plate 8 and the negative plate 9, the voltage at two ends of the piezoresistor 10 cannot meet the working voltage of the piezoresistor 10, the piezoresistor 10 is not electrified to work, the electromagnet 17 is not electrified, the electromagnet 17 does not generate a magnetic field, the magnetic flux in the electromagnet 17 is attracted by the permanent magnet 14, so that the clamping of the clamping block 16 is stable, when the heat generated by a product circuit exceeds the normal working range, the heat absorbed by the heat conducting sheet 7 is increased in temperature and is transmitted to the air bag 6, the air in the air bag 6 is heated to expand, so as to drive the starting block 4 to overcome the elastic action of the first, the positive plate 8 changes and the operating voltage that the voltage risees and reach piezo-resistor 10 because of relative area with negative plate 9, piezo-resistor 10 circular telegram, thereby control electro-magnet 17 circular telegram, electro-magnet 17 produces the magnetic field, electro-magnet 17 and permanent magnet 14 repel each other because of opposite face magnetism is the same, drive fixture block 16 and remove wire portion 1 and control lever 13 between being connected, wire portion 1 removes under the effect of spring two 12 elasticity, thereby make spread groove 18 and connection key 19 separation, the function that automatic control product opened circuit has been realized, prevent that the product from being impaired because of overheated, be favorable to user's use, after the product resumes to normal temperature, extrusion wire portion 1 each other, make wire portion 1 overcome spring two 12 elasticity and remove, fixture block 16 joint is in the draw-in groove of control lever 13 again, the cycle work of product has been realized.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A current circuit indirect thermal overload protection device comprises a wire part (1), and is characterized in that: the automatic wire guiding device is characterized in that symmetrical starting grooves (2) are formed in two sides of the wire portion (1), a first spring (3) is fixedly connected to the inner side of each starting groove (2), a starting block (4) is fixedly connected to the outer side of each first spring (3), a dielectric plate (5) is fixedly connected to the inner portion of each starting block (4), an air bag (6) is movably connected to the inner side of each starting groove (2), symmetrical heat conducting fins (7) are fixedly connected to two sides of the wire portion (1), symmetrical positive plates (8) are fixedly connected to two sides of the wire portion (1), symmetrical negative plates (9) are fixedly connected to two sides of the wire portion (1), symmetrical piezoresistors (10) are fixedly connected to two sides of the wire portion (1), symmetrical control grooves (11) are fixedly connected to two sides of the wire portion (1), a second spring (12) is fixedly connected to the inner side of each control groove (11), and, the permanent magnet (14) is fixedly connected to two sides of the control rod (13), symmetrical sliding grooves (15) are formed in two sides of the wire portion (1), a clamping block (16) is clamped inside the sliding grooves (15), an electromagnet (17) is fixedly connected inside the clamping block (16), a connecting groove (18) is formed in the left side of the wire portion (1), and a connecting key (19) is fixedly connected to the right side of the wire portion (1).

2. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the lead portion (1) includes an internal circuit layer and an external insulating layer, and the internal circuit layer is attached to the heat conductive sheet (7).

3. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the diameter of the dielectric plate (5) is smaller than that of the starting groove (2), the surface of the dielectric plate (5) is smooth, and the bottom surface of the dielectric plate (5) is attached to the air bag (6).

4. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the gas cell (6) comprises an outer plastic film layer and an inner gas having a coefficient of thermal expansion greater than that of air.

5. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the positive plate (8) and the negative plate (9) are the same in height, and the height of the positive plate (8) and the height of the negative plate (9) are smaller than that of the dielectric plate (5).

6. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the piezoresistor (10) is electrically connected with the negative plate (9), and the piezoresistor (10) is electrically connected with the electromagnet (17).

7. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the electromagnet (17) comprises a magnetic body, a surrounding coil and a control assembly, and the opposite surfaces of the electromagnet (17) and the permanent magnet (14) are the same in magnetism.

8. A current circuit indirect thermal overload protection apparatus as claimed in claim 1, wherein: the connecting key (19) is made of a conductive material, the connecting key (19) is fixedly connected with a conductive column, and the diameter of the connecting key (19) is equal to that of the connecting groove (18).