CN101728120A - Circuit protection device with dual temperature sensing power-off - Google Patents

Abstract

The invention discloses a circuit protection device with double temperature sensing power-off, wherein two independently operated temperature sensing power-off devices, a thermal sensing tripping device and a hot melting circuit-breaking device are arranged between two terminals of a circuit loop; when the current is overloaded, the circuit is overheated or the environment temperature is overhigh, the contact elastic sheet of the thermal induction tripping device is heated to deform and reversely bend to trip so as to cut off the power; furthermore, when the thermal induction tripping device has no response, no response or repeated power-off when the current is overloaded, the circuit is overheated or the environmental temperature is too high, and the temperature of the circuit loop continuously rises due to the power-on, the fusible alloy of the thermal fuse circuit-breaking device is heated to be melted and broken, so that the circuit loop is broken and the power-off is carried out. The two independent temperature induction circuit breaking devices respectively and independently induce temperature, have double temperature induction circuit breaking effects, enable a circuit loop to be powered off temporarily, powered on again or powered off completely, and avoid the danger of overheating of the circuit or fire of wires.

Description

Circuit protection device for double temperature sensing power failure

technical field

The invention relates to a circuit protection device, in particular to a circuit protection device with double temperature induction power-off

Background technique

The use of electricity is an indispensable part of modern human society. All kinds of electrical products and equipment surround our lives, especially computerized and informationized industries, homes, transportation, education, entertainment, etc., are impossible without electricity. In contrast, the safe use of electricity is something that modern people cannot but be cautious about.

Generally speaking, there is a main switch for power control in the overall circuit circuit that provides electricity. Usually the main switch is in the ON state, and a fuse or a breaker is set on it. When too many electrical appliances used in the circuit circuit cause current In the event of overload, short circuit, or overheating of the circuit, the fuse will blow or the circuit breaker will trip to form an OFF state of the entire circuit.

In addition, there are separate circuit loops in the overall circuit loop, and a control switch is set in the circuit loop. The switch is mainly to perform two actions of energizing (ON) and deenergizing (OFF) the respective current loops. In order to enhance the safety of electricity consumption, many switches also have the function of automatically tripping and powering off when the current is overloaded and overheated, so as to avoid that the fuse or breaker of the overall circuit circuit cannot respond in real time to power off or trip when the current is overloaded. There is a risk of a wire fire.

In addition to the above-mentioned overall circuit circuit and individual circuit circuits, using fuses, breakers and switches to automatically trip over current and overheat, and power-off structures, some single electronic and electrical products, such as: high-priced electronic products, information processing data Equipment or electric heating appliances with high power consumption are also equipped with circuit protection devices with temperature-sensitive circuit breakers to protect the single electronic or electrical product when the current of the single electronic or electrical product is overloaded or the circuit is overheated. , real-time sensing and power off, avoiding burning the product itself, and at the same time avoiding the current overload and overheating of the individual circuit loops and the overall circuit loop due to problems with a single electronic or electrical product, resulting in damage to the circuit loop or the overall circuit loop. Other electrical equipment cannot work.

The existing temperature-sensing power-off protector used in a single electronic product, as shown in Figure 1 and Figure 2, is provided with a contact elastic piece 101 in the circuit, and the contact elastic piece 101 is set in a curved shape, deformed and reversely bent after being heated For bouncing, one end of the contact shrapnel is fixedly arranged on the first terminal 102, the other end of the contact shrapnel 101 is a free end, the free end is set with the first conductive point 103, and the second terminal 104 is fixedly set with the second conductive point 105. , the second conductive point 105 corresponds to the first conductive point 103; during implementation, the contact elastic piece 101 keeps bending toward the direction of the second terminal 104, so that the first conductive point 103 at the free end of the contact elastic piece 101 and the second conductive point of the second terminal 104 The point 105 maintains the contacted circuit connection state, as shown in Figure 1; when the current is overloaded, the contact elastic piece 101 is heated and deformed and reversely bent to bounce, so that the first conductive point 103 at the free end of the contact elastic piece 101 is separated from the second conductive point 105 , into a circuit cut-off (OFF) state, as shown in Figure 2, which can ensure that the circuit of the electronic product itself is not burned. However, the disadvantages of existing temperature-sensing power-off protectors are:

(a) When making the contact elastic sheet 101, it is impossible to ensure that the thickness, curvature and structural characteristics of each contact elastic sheet 101 are exactly the same, so it is difficult to effectively control the reaction temperature value of the contact elastic sheet 101 deforming and reversely bending and bouncing after being heated. The temperature value of the fixed induction has a large error.

(b) The sensitivity of the contact spring 101 to deform and reversely bend and bounce after being heated is not high, and it cannot protect the electronic product in time when it is overloaded and overheated.

(c) The contact shrapnel 101 cannot be disconnected immediately or is incompletely tripped, so that the circuit is still in the current conduction state, and the circuit continues to overheat, causing danger to the electronic product and the entire circuit.

When the current overload circuit is overheated, if the contact shrapnel 101 is in a semi-tripped state, when the contact shrapnel 101 cools down, it will jump back to the energized state, and the continuous repeated power-on and power-off will form sparks, causing danger; and the electronics in the overall current circuit, Due to repeated power-on and power-off of electrical equipment, the current is unstable, resulting in crashes or malfunctions, shortened service life, or even complete damage.

Contents of the invention

The present invention is to solve the problem that the existing temperature-sensing power-off protector has only one tripping power-off device with contact shrapnel as temperature induction, and cannot effectively set a power-off induction temperature value, and, when the current is overloaded and overheated, if When the contact shrapnel cannot be tripped in real time, the trip is incomplete or cannot be tripped, the circuit will continue to be turned on or repeatedly energized and cut off to generate sparks, resulting in unstable current and causing electronic products to crash, fail to operate normally or shorten the service life. Even complete damage to various problems.

In order to solve the above problems, the present invention provides a circuit protection device with double temperature induction power cut, which includes a cover, a thermal induction tripping device, a thermal cutoff device, and a base;

The cover is an electrical conductor connected to a first terminal;

The thermal induction tripping device includes a contact elastic piece and a conductive connection part; the contact elastic piece is an elastic metal sheet body, which is formed in a curved arc shape and can jump to the two sides of the sheet body, and the contact elastic piece will be deformed when heated Bending in the opposite direction and bouncing to the other side, one end of the contact spring is fixedly combined with the aforementioned cover, and the free end of the contact spring sets up a first conductive point; the conductive connection part is plate-shaped, and a second conductive point, the second conductive point corresponds to the aforementioned first conductive point;

The thermal cutoff device includes a conductor, a fusible alloy, and a second terminal; the conductor is an elastic body, one end of which is in fixed contact with the conductive connection part of the aforementioned thermal induction tripping device and is electrically connected, and the conductor The other end of the conductor is a free end. In the state of no external force, the free end of the conductor remains downward, and the free end of the conductor is separated from the second terminal; the fusible alloy joins the free end of the conductor and the second terminal. The second terminal forms an electrical connection, and the free end of the conductor accumulates elastic force separating from the second terminal;

The seat body is provided with a containing groove; the aforementioned conductive connection part, conductor and fusible alloy are embedded in the containing groove;

In a normal state, the first conductive point of the contact spring of the thermal induction tripping device is kept in contact with the second conductive point to form a circuit connected state; when the current is overloaded, the circuit is overheated or the ambient temperature is too high, the thermal induction The contact shrapnel of the tripping device is heated and deformed and reversely bends to trip, so that the first conductive point is separated from the second conductive point, and the circuit is in an open circuit state. The point is in contact with the second conductive point to form a reconnection state of the circuit;

Further, in the state of current overload, overheating of the circuit, or excessive ambient temperature, if the thermal induction tripping device fails to trip in real time or fails to trip and cut off the power, the fusible alloy of the thermal fuse device will continue to be heated and continue to operate. When the temperature rises and reaches the set temperature, the fusible fusion will be broken, and the conductor will separate the free end from the second terminal with its own accumulated elastic force, forming a completely de-energized state of the circuit loop.

The contact spring of the thermal induction tripping device is a composite metal sheet.

The conductor of the thermal cutoff device is generally an elastic sheet.

Stamping the end of the fusible alloy of the thermal fuse circuit breaker with external force, the two ends of the fusible alloy expand outward and shorten, so that the free end of the conductor and the second terminal contact each other to form an electrical connection;

The second terminal is fixed, and the free end of the conductor is pulled toward the second terminal by the fusible alloy, so that the free end of the conductor accumulates elastic force separating from the second terminal.

The fusible alloy of the thermal cut-off device connects the free end of the conductor to the second terminal by welding to form an electrical connection.

The free end of the electric conductor of the thermal fuse device is provided with a junction, and the second terminal is provided with a junction; the junction of the free end of the conductor and the junction of the second terminal are connected with a fusible alloy to form an electrical connection.

A clamping groove is provided on the side of the base body, and the second terminal is fixedly clamped in the clamping groove of the base body.

The present invention is a kind of circuit protection device with double temperature induction power-off. Its beneficial effect is that through two independent temperature induction circuit breakers, when the current is overloaded or the circuit is overheated, they can sense the temperature independently, so that the circuit circuit can be completely cut off (OFF) ), with double temperature sensing circuit breaker function to ensure the safety of electricity.

When the current is overloaded, the circuit is overheated or the ambient temperature is too high, the contact shrapnel of the thermal induction tripping device is heated and deformed to reversely bend and trip to cut off the power (OFF), without using the fusible block of the thermal fuse circuit breaker to break To achieve the circuit circuit power off (OFF), so after eliminating the overload factor of the circuit circuit, contacting the shrapnel to cool down, and then returning to the state of energization (ON), the circuit protection device can still be used continuously, and there is no need to install a new circuit protector. Save time and reduce user expenses.

When the current is overloaded or the circuit is overheated, the thermal induction tripping device does not respond or does not respond in time, or the temperature continues to rise due to repeated power-off (OFF) and power-on (ON), the fusible alloy of the thermal fuse device will be further heated to a certain extent. It has the characteristics of continuous heating and melting. When the fusible alloy reaches the set temperature critical value, it will melt and make the circuit circuit completely disconnected (OFF), ensuring safe use of electricity, and used to protect various electrical appliances in the circuit circuit.

Description of drawings

FIG. 1 is a combined cross-sectional view of a temperature-sensing power-off protector in the prior art, showing the conduction (ON) state of the temperature-sensing power-off protector in the prior art.

Fig. 2 is a combined cross-sectional view of the temperature-sensing power-off protector in the prior art, showing the state of tripping and power-off (OFF) of the temperature-sensing power-off protector in the prior art.

FIG. 3 is a three-dimensional exploded view of a circuit protection device for dual temperature-sensing power-off according to an embodiment of the present invention.

FIG. 4 is a three-dimensional assembly diagram of a circuit protection device for dual temperature-sensing power-off according to an embodiment of the present invention.

5 is a schematic top view of the uncovered body of the circuit protection device with dual temperature induction power-off according to the embodiment of the present invention, showing the conduction (ON) state of the circuit protection device with dual temperature-induced power-off according to the embodiment of the present invention.

6 is a combined cross-sectional view of the circuit protection device with dual temperature-induced power-off according to the embodiment of the present invention, showing the ON state of the circuit protection device with dual-temperature-induced power-off according to the embodiment of the present invention.

7 is a combined sectional view of a circuit protection device with dual temperature-induced power-off according to an embodiment of the present invention, showing a schematic diagram of tripping power-off (OFF) in a general state of the circuit protection device with dual-temperature-induced power-off according to an embodiment of the present invention.

Fig. 8 is a schematic top view of the uncovered body of the circuit protection device with dual temperature induction power-off according to the embodiment of the present invention, showing that when the current overload of the circuit protection device with dual temperature induction power-off according to the embodiment of the present invention, the thermal induction tripping device is not activated. When the power is tripped in time or cannot be tripped, the fusible alloy of the thermal cut-off device is heated and melts and breaks, forming a signal that the circuit circuit is completely powered off (OFF).

Detailed ways

In order to disclose the purpose, features and effects of the present invention in detail, through the following preferred specific embodiments, in conjunction with the attached drawings, the present invention will be described in detail as follows:

As shown in FIG. 3 to FIG. 6, it is a three-dimensional exploded view, a three-dimensional assembled view, a schematic top view of an uncovered body, and a combined cross-sectional view of the embodiment of the present invention. A circuit protection device with double temperature induction power cut of the present invention includes a cover body 10, a thermal induction tripping device 20, a thermal fuse circuit breaker device 30, and a base body 40; wherein,

The cover 10 is a conductor and connected to a first terminal 11 .

The thermal induction tripping device 20 includes a contact elastic piece 21 and a conductive connecting portion 22; the contact elastic piece 21 is an elastic metal sheet body, which is formed in a curved arc shape and can jump to the two sides of the sheet body, and the contact elastic piece 21 When heated, it will deform and bend in reverse and bounce to the other side. The contact elastic piece 21 can be a composite metal sheet. One end of the contact elastic piece 21 is fixedly combined with the inner side of the aforementioned cover 30. The free end of the contact elastic piece 21 is assembled with a first conductive point 211 ; the conductive connection portion 22 is generally in the shape of a plate, and a second conductive point 221 is disposed on the upper side thereof, and the second conductive point 221 corresponds to the aforementioned first conductive point 211 . The conductive connecting portion 22 is provided with a notch 222 and at least one combination hole 223 .

The thermal cutoff device 30 includes a conductor 31, a fusible alloy 32, and a second terminal 33; the conductor 31 is an elastic body with good elasticity, and the conductor 31 in this embodiment is generally an elastic sheet Shaped body; one end (left end) side of the conductor 31 extends at least two lugs 310, a clamping groove 311 is formed between the lugs 310, the lugs 310 are in fixed contact with the conductive connection part 22 of the aforementioned thermal induction tripping device 20 and electrically In communication, the other end of the conductor 31 is a free end 312, and the free end is provided with a junction 313. In this embodiment, the junction 313 is a perforation, but of course it can also be a gap. In the state of no external force, the free end 312 of the conductor 31 remains in a downward state, that is, the free end 312 of the conductor 31 is separated from the second terminal 33; the fusible alloy 32 is generally a long strip body; the second terminal 33 is provided with a joint 331, in this embodiment, the joint 331 is a through hole, of course, it can also be a gap. The fusible alloy 32 connects the joint 313 of the free end 312 of the conductor 31 and the joint 331 of the second terminal 33 , so that the free end 312 of the conductor 31 is electrically connected to the second terminal 33 . In this embodiment, the ends of the fusible alloy 32 are punched with an external force, so that the two ends of the fusible alloy 32 expand outward and shorten, forcing the junction 313 of the conductor 31 and the junction 331 of the second terminal 33 to interact with each other. electrical connection through contact; welding can also be used to weld the fusible alloy 32 to the junction 313 of the conductor 31 and the junction 331 of the second terminal 33 to form an electrical connection. Since the second terminal 33 is fixed, the free end 312 of the conductor 31 is pulled toward the second terminal 33 by the fusible alloy 32, so that the free end 312 of the conductor 31 accumulates and separates from the second terminal 33. When the bonding force of the fusible alloy 32 is lost, the free end 312 of the conductor 31 will be separated from the second terminal 33 by the accumulated elastic force.

The seat body 40 is provided with a receiving groove 41 , a protruding rod 42 and a convex portion 43 are arranged in the receiving groove 41 , and a clamping groove 44 is arranged on the side of the seat body 40 .

When assembling, referring to FIG. 5 , the notch groove 222 and the coupling hole 223 of the conductive connecting portion 22 correspond to the convex portion 43 and the protruding rod 42 of the housing groove 41 of the seat body 40 respectively. The clamping groove 311 clamps the protrusion 43 of the housing groove 41 correspondingly, so that the conductive connecting part 22 and the conductor 31 are embedded in the housing groove 41 , and the second terminal 33 is fixedly clamped in the clamping groove 44 of the base 40 .

In the general state of the present invention, the contact elastic piece 21 of the thermal induction tripping device 20 is kept bent downward, so that the first conductive point 211 of the contact elastic piece 21 is kept in contact with the second conductive point 221 of the conductive connection part 22, and the current is formed by The first terminal 11 reaches the second terminal via the cover 10, the contact spring 21, the first conductive point 211, the second conductive point 221, the conductive connection part 22, the protruding piece 310, the conductor 31, the free end 312, and the fusible alloy 32. The circuit loop connection (ON) state of 33 is shown in Fig. 5 and Fig. 6.

In general state, when the current is overloaded, the circuit is overheated or the ambient temperature is too high, the thermal induction tripping device 20 will produce a temporary trip, power off (OFF), and after the temperature drops, it will automatically recover to form a circuit connection (ON); that is, the contact elastic piece 21 of the thermal induction tripping device 20 is heated and deformed and reversely bends (upward) to trip off, so that the first conductive point 211 is separated from the second conductive point 221, and the circuit is turned into an open circuit (OFF) state , as shown in Figure 7. When the temperature drops, after the contact elastic piece 21 of the thermal induction tripping device 20 cools down, the contact elastic piece 21 deforms again and reversely bends (downward) jumps, so that the first conductive point 211 contacts the second conductive point 221, and the circuit is formed. Connected (ON) state, as shown in Figure 6.

Further, when the current is overloaded, the circuit is overheated, or the ambient temperature is too high, if the contact spring 21 of the thermal induction tripping device 20 cannot be deformed in real time or cannot be deformed by heat, reverse bending (upward) and tripping and power failure (OFF) , the fusible alloy 32 of the thermal fuse device 20 continues to heat up due to continuous heating. After reaching the set temperature, the fusible alloy 32 is melted, and generally at least two residual blocks 32' in a separated state will be formed. , as shown in Figure 8, at this time, the connection of the fusible alloy 32 is lost, and the free end 312 of the conductor 31 is able to bounce down and separate from the second terminal 33 by the elastic force accumulated by itself, forming a circuit The complete power-off (OFF) state of the circuit ensures the complete power-off (OFF) state of the circuit loop and will not return to power-on (ON).

In the present invention, when the current is overloaded, the circuit is overheated or the ambient temperature is too high, the contact shrapnel 21 of the thermal induction tripping device 20 is heated and deformed to reversely bend and trip to cut off the power (OFF). When the thermal induction tripping device 20 has no response , Insufficient response or repeated power-off (OFF) and power-on (ON) and the temperature continues to rise, the fusible alloy 32 of the thermal fuse device 30 will be further fused, and the conductor 31 will be forced to conduct electricity with its own accumulated elastic force The free end 312 of the body 31 is separated from the second terminal 33 to form a complete de-energization (OFF) of the circuit loop, and the circuit loop cannot be restored to an energized (ON) state. The invention has two independent temperature-sensing power-off settings, and is a circuit protection device with double temperature-sensing power-off, which can ensure the effect of complete power-off (OFF) of the circuit loop.

The present invention has been described in detail above, and the above description is only a preferred embodiment of the present invention, and should not limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the application scope of the present invention should still fall within the scope of the patent of the present invention.

Claims (7)

1. A circuit protection device with dual temperature sensing power-off function comprises a cover body, a thermal sensing tripping device, a thermal melting circuit-breaking device and a base body; it is characterized in that the preparation method is characterized in that,

the cover body is a conductor and is connected with a first terminal;

the thermal induction tripping device comprises a contact spring and a conductive connecting part; the contact spring sheet is a metal sheet body with elasticity, is formed into a curved arc shape, can jump to two side surfaces of the sheet body, can deform and reversely bend when being heated and bounce to the other side surface, one end of the contact spring sheet is fixedly combined with the cover body, and the free end of the contact spring sheet is provided with a first conductive point; the conductive connecting part is in a plate shape, and the upper side surface of the conductive connecting part is provided with a second conductive point which corresponds to the first conductive point;

the hot melting circuit breaking device comprises a conductor, a fusible alloy and a second terminal; the electric conductor is an elastic body, one end of the electric conductor is fixedly contacted with the electric conduction connecting part of the thermal induction tripping device and is electrically communicated with the electric conduction connecting part, the other end of the electric conductor is a free end, the free end of the electric conductor is kept in a downward state under the state of not being subjected to external force, and the free end of the electric conductor is separated from the second terminal; the fusible alloy is connected with the free end of the electric conductor and the second terminal to form electric connection, and the free end of the electric conductor accumulates elastic force separated from the second terminal;

the seat body is provided with a containing groove; the conductive connecting part, the electric conductor and the fusible alloy are embedded in the accommodating groove;

in a normal state, the first conductive point and the second conductive point of the contact elastic sheet of the thermal induction tripping device are kept in contact to form a circuit loop communication state; when the current is overloaded, the circuit is overheated or the using environment temperature is overhigh, the contact elastic sheet of the thermal induction tripping device is heated to deform and reversely bend and trip, so that the first conductive point is separated from the second conductive point, the circuit is in an open circuit state, and after the contact elastic sheet is cooled, the contact elastic sheet deforms and reversely bends again, the first conductive point contacts with the second conductive point, and a reconnection state of the circuit is formed;

furthermore, in the state of current overload, circuit overheating or over-high ambient temperature in use, if the thermal induction tripping device fails to trip in real time or cannot trip and is powered off, the fusible alloy of the thermal fuse tripping device is continuously heated and continuously heated, and after the set temperature is reached, the fusible alloy is melted, and the free end and the second terminal are separated by the elastic force accumulated by the conductor per se, so that the complete power-off state of the circuit loop is formed.

2. The dual temperature sensing deenergized circuit protection device of claim 1, wherein said thermally sensitive trip unit contact spring is a composite metal foil.

3. The dual temperature sensing power-off circuit protection device of claim 1, wherein the electrical conductor of the thermal fuse circuit-breaking device is a flexible sheet.

4. The dual temperature sensing power cutoff circuit protection device of claim 1 wherein said fusible alloy of said thermal cutoff device is forced to punch the ends, the ends of the fusible alloy expanding and contracting outwardly to bring the free ends of the electrical conductors into contact with the second terminals to form an electrical connection;

the second terminal is fixed, and the free end of the conductor is pulled toward the second terminal by the fusible alloy, so that the free end of the conductor accumulates elastic force for separating from the second terminal.

5. The dual temperature sensing power cutoff circuit protection device of claim 4 wherein said fusible alloy of said thermal cutoff connects said free end of said electrical conductor to said second terminal by welding to form an electrical connection.

6. The dual temperature sensing power cutoff circuit protection device of claim 1 wherein said thermally fusible circuit interrupting device has a junction at the free end of the conductor and said second terminal has a junction; the junction of the free end of the conductor and the junction of the second terminal are connected by a fusible alloy to form an electrical connection.

7. The dual temperature sensing power-off circuit protection device of claim 1, wherein a clamping groove is formed on a side of the base, and the second terminal is fixedly clamped in the clamping groove of the base.

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