CN112018728B

CN112018728B - Direct current circuit overheating and overcurrent protection equipment

Info

Publication number: CN112018728B
Application number: CN202010839910.4A
Authority: CN
Inventors: 乔沙秋竹
Original assignee: Chizhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
Current assignee: Chizhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2022-11-08
Anticipated expiration: 2040-08-19
Also published as: CN112018728A

Abstract

The invention discloses a direct-current line overheating and overcurrent protection device which comprises a shell, wherein a wiring electromagnet is fixed at the inner bottom of the shell, a disconnection electromagnet is fixed on the inner wall of the shell, a supply capacitor and a short-circuit capacitor are fixed at the inner top of the shell, a wiring combination is fixed on the inner wall of the shell, the wiring combination comprises two electric connecting pieces symmetrically fixed on the inner wall of the shell, and the upper ends of the two electric connecting pieces are propped against a current conducting plate together. Has the advantages that: cross at the inside dichloromethane solution that adds of ripple bag for the circuit is with the electrical apparatus back that generates heat, when power supply ambient temperature rose, dichloromethane solution can gasify and makes the ripple bag inflation, thereby make the current conducting plate have the trend of earning the wiring electro-magnet, and when the high temperature, the current conducting plate will remove under the promotion of ripple bag, thereby with the connection piece separation, make outer circuit disconnection, and then realize overheat protection, avoid with circuit overheat damage.

Description

Direct current circuit overheating and overcurrent protection equipment

Technical Field

The invention relates to the technical field of line protection, in particular to a direct-current line overheating and overcurrent protection device.

Background

The overcurrent protector is also arranged in the circuit, when the current amount in the circuit exceeds a set value, the internal circuit is disconnected to cut off the whole loop, so as to prevent accidents caused by overlarge current;

in the existing circuit, two circuit protectors are respectively installed in the circuit, overheat protection and overcurrent protection can be respectively carried out on the circuit, but two installation positions are respectively required to be set in the circuit, the circuit is complex, the maintenance is difficult, a plurality of electric wires are required to be added simultaneously, the cost is increased, the size of equipment also needs to be correspondingly increased, and in the field of circuit protectors, the equipment with overlarge size is difficult to apply to various products, the cost is increased, the application range of the equipment is also influenced, and therefore an integrated overheat and overcurrent line protection device is urgently needed.

Disclosure of Invention

The invention aims to solve the problem that the circuit overcurrent and overheat protection in the prior art is separately arranged and inconvenient to manage, and provides direct-current circuit overcurrent and overheat protection equipment.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a direct current circuit overheat overcurrent protection equipment, includes the shell, the interior bottom of shell is fixed with the wiring electro-magnet, the inner wall of shell is fixed with the broken string electro-magnet, the interior top of shell is fixed with and supplies condenser and short-circuit capacitor, the inner wall of shell is fixed with the wiring combination, the wiring combination is fixed in two on the shell inner wall including the symmetry and connects the electric plate, two connect the common counterbalance of the upper end of electric plate to have the current conducting plate, the bottom of current conducting plate and the upper end of wiring electro-magnet are fixed with the ripple bag jointly.

In the above dc line overheat and overcurrent protection apparatus, the wiring electromagnet and the wiring combination are connected in series to an external line through a wire, the supply capacitor, the disconnection electromagnet and the short-circuit capacitor are connected in series through a wire to form an electricity control combination, and the electricity control combination and the wiring electromagnet are connected in parallel to a circuit.

In the above dc line overheat and overcurrent protection apparatus, the ripple bag is filled with a dichloromethane solution, and the magnetism of the disconnection electromagnet is weaker than that of the connection electromagnet.

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

1. according to the invention, the current-conducting plate can be fully attached to the power connection piece by binding the current-conducting plate by the wiring electromagnet, and when the wiring environment temperature does not reach the critical temperature, the connection between the current-conducting plate and the power connection piece cannot be influenced even if the corrugated bag expands, so that the stable power supply of a power connection circuit is ensured;

2. according to the invention, the dichloromethane solution is added in the corrugated bag, so that after the circuit electric appliance is heated, when the temperature of the power supply environment rises, the dichloromethane solution can be gasified to expand the corrugated bag, so that the conductive plate has a tendency of breaking loose the wiring electromagnet, and when the temperature is too high, the conductive plate moves under the pushing of the corrugated bag, so that the conductive plate is separated from the electric connecting piece, so that the external circuit is disconnected, the overheating protection is realized, the overheating damage of the circuit is avoided, and the corrugated bag automatically contracts after the temperature is reduced, so that the circuit is automatically connected;

3. according to the invention, by arranging the short-circuit capacitor, when a line is in overcurrent, the short-circuit capacitor is broken through the short-circuit capacitor, the wiring electromagnet is in short circuit, and the supply capacitor is enabled to discharge to the disconnection electromagnet, so that the current conducting plate is not bound by the wiring electromagnet and moves under the magnetic force action of the disconnection electromagnet, and is further separated from the connection piece, the line is disconnected, the overcurrent damage of the line is avoided, and after the discharge of the supply capacitor is finished, the current conducting plate is reset after the short-circuit capacitor is recovered, so that the line is automatically reconnected without human intervention;

4. according to the invention, after an external circuit is manually closed, the supply capacitor and the short-circuit capacitor simultaneously supply power to the wiring electromagnet, so that the wiring electromagnet keeps magnetism in a short time, a connection state between the wire guide plate and the electric connection piece is kept, when the power supply is manually restored in a short time, the connection of the circuit can be ensured, the electric connection piece is not separated from the current guide plate after the artificial power failure caused by the thermal expansion of the corrugated bag, the problem that the circuit cannot be normally connected after the manual short-time opening and closing is avoided, the discharge time of the supply capacitor and the short-circuit capacitor is enough for the internal cooling and contraction of the corrugated bag, and the subsequent use of the circuit cannot be influenced.

Drawings

Fig. 1 is a schematic structural diagram of a dc line overheat and overcurrent protection device according to the present invention;

fig. 2 is a wiring circuit diagram of components inside the housing of the dc line overheat and overcurrent protection device according to the present invention.

In the figure: 1 outer shell, 2 wiring electromagnets, 3 disconnection electromagnets, 4 supply capacitors, 5 short circuit capacitors, 6 wiring combination, 61 ripple capsule, 62 connection electric sheet, 63 conductive plate.

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. 1-2, the direct current line overheating and overcurrent protection device comprises a shell 1, a wiring electromagnet 2 is fixed at the inner bottom of the shell 1, a wire breaking electromagnet 3 is fixed on the inner wall of the shell 1, a supply capacitor 4 and a short-circuit capacitor 5 are fixed at the inner top of the shell 1, a wiring combination 6 is fixed on the inner wall of the shell 1, the wiring combination comprises two electric connecting pieces 62 symmetrically fixed on the inner wall of the shell 1, the upper ends of the two electric connecting pieces 62 are in the same phase and abut against a conductive plate 63, a corrugated bag 61 is fixed at the bottom of the conductive plate 63 and the upper end of the wiring electromagnet 2, and the corrugated bag 61 is made of elastic materials and can be expanded.

The wiring electromagnet 2 and the wiring combination 6 are connected in series into an external circuit through a lead, the supply capacitor 4, the disconnection electromagnet 3 and the short-circuit capacitor 5 are connected in series through leads to form an electricity control combination, the electricity control combination and the wiring electromagnet 2 are connected in parallel into a circuit, the short-circuit capacitor 5 is easier to be broken down than the supply capacitor 4, and the short-circuit capacitor 5 can be automatically recovered after being broken down.

The dichloromethane solution is filled in the corrugated bag 61, the dichloromethane solution is heated and is easy to evaporate, so that the corrugated bag 61 is expanded, the magnetism of the disconnection electromagnet 3 is weaker than that of the connection electromagnet 2, and therefore when the connection electromagnet 2 and the disconnection electromagnet 3 are simultaneously connected with electricity, the conducting plate 63 is bound by the connection electromagnet 2 and keeps a joint connection state with the electricity connection piece 62.

In the invention, when the circuit normally works, the wiring electromagnet 2 is electrified to generate a strong magnetic field, the conductive plate 63 is effectively adsorbed, the conductive plate 63 is tightly attached to the two electric connecting pieces 62, so that the stable electric connection process is ensured, the capacitor 4 and the short-circuit capacitor 5 are charged at the initial stage of the circuit connection, so that certain electric energy is stored, the circuit does not pass through current any more after being fully charged, the broken electromagnet 3 can generate electricity to generate a magnetic field in the charging process, but the magnetic force is weaker than that of the wiring electromagnet 2, so that the normal connection of the circuit is not influenced;

after the heat energy of the electric appliance in the circuit is accumulated after long-time working, the temperature of the environment where the shell 1 is located rises, so that the dichloromethane solution in the ripple bag 61 continuously absorbs the environment heat, the electric appliance absorbs heat and cools the surrounding environment, and simultaneously is continuously gasified, so that the ripple bag 61 expands and has a tendency of moving upwards, so that the current-conducting plate 63 is pressed by the current-conducting plate and has a tendency of moving upwards, but the magnetic force of the wiring electromagnet 2 is stronger, when the temperature does not reach a critical value, the current-conducting plate 63 cannot break away the magnetic action of the wiring electromagnet 2, so that the circuit is normally conducted, and when the electric appliance generates excessive heat, the working environment temperature is higher, so that the dichloromethane in the ripple bag 61 is greatly gasified, the ripple bag 61 expands to push the current-conducting plate 63 to move to break away from the binding of the wiring electromagnet 2, the current-conducting plate 63 is separated from the current-connecting plate 62 after moving, so that the wiring assembly 6 is disconnected, the power of the whole circuit is cut off, effective overheat protection is achieved, the phenomenon that the electric appliance and the electric appliance are damaged by continuous high-temperature work is avoided, the dichloromethane and the circuit is liquefied after the temperature is reduced, the dichloromethane is contracted and the current-connecting plate 61 is reset, so that the current-connecting plate 62 is combined with the current-connecting plate 63, and the circuit is automatically recovered;

when the overcurrent problem occurs on the circuit, the originally stable short-circuit capacitor 5 is broken down, so that the wiring electromagnet 2 is short-circuited and does not generate a magnetic field any more, and the supply capacitor 4 discharges outwards, so that the disconnection electromagnet 3 is electrified to generate a magnetic field, in this state, the current conducting plate 63 is not bound by the wiring electromagnet 2 and moves upwards under the attraction of the disconnection electromagnet 3, so that the current conducting plate is separated from the power connection piece 62, the whole circuit is disconnected, the electric appliance and the power connection circuit are prevented from being damaged by high current, good overcurrent protection is achieved, after the discharge of the supply capacitor 4 is finished, the short-circuit capacitor 5 is recovered, and the current conducting plate 63 resets under the elastic force of the bellows 61, so that the circuit is automatically switched on again;

at the higher ambient temperature of the circuit, ripple bag 61 is under the inflation state, when the artificial disconnection of external circuit, supply capacitor 4 and short-circuit capacitor 5 will discharge to wiring electro-magnet 2 simultaneously, thereby make wiring electro-magnet 2 lose the supply of external circuit, also can keep the magnetic force of a period of time, because disconnection electro-magnet 3 magnetism is relatively weak, therefore conducting plate 63 still will receive the constraint of wiring electro-magnet 2, thereby keep the contact with electric connection plate 62 within a certain period of time, make the user resume external circuit power supply in the short time after, wiring electro-magnet 2 can be timely electrified, can not lead to artificial outage back electric connection plate 62 and conducting plate 63 separation because of the inflation of ripple bag 61, thereby guarantee that the artificial short-time outage resumes the internal circuit of shell 1 and keep the intercommunication, make the circuit can guarantee good timely switch-on, and supply capacitor 4 and short-circuit capacitor 5 enough internal cooling shrink of ripple bag 61 for the discharge time, thereby can not influence the use of circuit.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The direct-current line overheating and overcurrent protection device comprises a shell (1) and is characterized in that a wiring electromagnet (2) is fixed at the inner bottom of the shell (1), a wire breaking electromagnet (3) is fixed on the inner wall of the shell (1), a supply capacitor (4) and a short-circuit capacitor (5) are fixed at the inner top of the shell (1), a wiring combination (6) is fixed on the inner wall of the shell (1), the wiring combination comprises two electric connection pieces (62) symmetrically fixed on the inner wall of the shell (1), the upper ends of the two electric connection pieces (62) are abutted to a conductive plate (63) in the same phase, and a corrugated bag (61) is fixed at the bottom of the conductive plate (63) and the upper end of the wiring electromagnet (2) in the same phase;

the wiring electromagnet (2) and the wiring combination (6) are connected into an external circuit in series through a lead, the supply capacitor (4), the disconnection electromagnet (3) and the short-circuit capacitor (5) are connected into an electricity control combination in series through leads, and the electricity control combination and the wiring electromagnet (2) are connected into a circuit in parallel;

the interior of the corrugated bag (61) is filled with dichloromethane solution, and the magnetism of the wire breaking electromagnet (3) is weaker than that of the wire connecting electromagnet (2);

when the circuit normally works, the wiring electromagnet (2) is electrified to generate a strong magnetic field, the conductive plate (63) is effectively adsorbed, the conductive plate (63) is tightly attached to the two electric connecting pieces (62), so that the stable electric connection process is ensured, the supply capacitor (4) and the short-circuit capacitor (5) can be charged at the initial stage of the circuit connection, certain electric energy is stored, the circuit does not pass through current any more after being fully charged, the disconnection electromagnet (3) can be electrified to generate a magnetic field in the charging process, but the magnetic force is weaker than that of the wiring electromagnet (2), so that the normal connection of the circuit cannot be influenced;

after the long-time working heat of the electric appliance gathers in the circuit, the ambient temperature of the shell (1) rises, so that dichloromethane solution in the corrugated bag (61) continuously absorbs the ambient heat, the heat is absorbed and the temperature of the surrounding environment is reduced, the shell is continuously gasified, the corrugated bag (61) expands and tends to move upwards, the conductive plate (63) is pressed by the conductive plate (61) and tends to move upwards, but the magnetic force of the wiring electromagnet (2) is strong, so that the conductive plate (63) cannot break away from the magnetic force of the wiring electromagnet (2) when the temperature does not reach the critical temperature, the circuit is normally conducted, when the electric appliance generates too much heat, the ambient temperature of the work is higher, so that the dichloromethane in the corrugated bag (61) is greatly gasified, the corrugated bag (61) expands to push the conductive plate (63) to move so as to break away from the magnetic force of the wiring electromagnet (2), the conductive plate (63) separates from the electric connection sheet (62) after moving, the electric appliance (63) is disconnected, the electric connection sheet (62) is automatically recovered after being electrified, and the electric appliance is automatically recovered from the circuit (61);

when the overcurrent problem occurs to a circuit, the originally stable short-circuit capacitor (5) is broken down, so that the wiring electromagnet (2) is not subjected to short circuit to generate a magnetic field any more, and the supply capacitor (4) discharges outwards at the same time, so that the disconnection electromagnet (3) is electrified to generate a magnetic field, in this state, the current-conducting plate (63) is not bound by the wiring electromagnet (2) any more, but is attracted by the disconnection electromagnet (3) to move upwards and is separated from the connection piece (62), so that the whole circuit is disconnected, the electric appliance and the connection circuit are prevented from being damaged by high current, good overcurrent protection is achieved, after the discharge of the supply capacitor (4) is finished, the short-circuit capacitor (5) is recovered, and meanwhile, the current-conducting plate (63) resets under the elastic force action of the corrugated bag (61), so that the circuit is automatically switched on again;

at the higher ambient temperature of the circuit, ripple bag (61) is under the inflation state, when outer circuit is artificially disconnected, supply capacitor (4) and short-circuit capacitor (5) will discharge to wiring electro-magnet (2) simultaneously, thereby make wiring electro-magnet (2) even lose the supply of outer circuit, still can keep the magnetic force of a period of time, because disconnection electro-magnet (3) magnetism is relatively weak, consequently current-conducting plate (63) still will receive the constraint of wiring electro-magnet (2), thereby keep the contact with electric connection piece (62) in a certain time, make the user resume external circuit power supply in the short time after, wiring electro-magnet (2) can be timely got electric, can not lead to electric connection piece (62) and current-conducting plate (63) separation after the artificial outage because of the inflation of ripple bag (61), thereby guarantee that shell (1) internal line keeps the intercommunication when the artificial outage resumes in the short time, make the circuit can guarantee good timely switch-on, and supply capacitor (4) and short-circuit capacitor (5) internal contraction of sufficient discharge time, thereby can not influence the use of cooling circuit.