JP2010086675A - Circuit protection structure performing double temperature-sensitive interruption - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit protection structure performing double temperature-sensitive interruption. <P>SOLUTION: A temperature-sensitive interruption device 20 and a thermal fuse device 30 independently operating are fitted between two terminals of a circuit. At overcurrent, circuit overheating, or when environment temperature is too high, an elastic contact plate 21 of the temperature-sensitive interruption device 20 first receives heat to deform and get curved and shuts off (OFF) the circuit. When the temperature-sensitive interruption device 20 does not react, delays in reaction, or repeats electricity conduction (ON) and shutoff (OFF) to cause temperature to continuously rise, soluble alloys 33, 33' of the thermal fuse device 30 melt down to secure perfect shutoff (OFF) of the circuit. The two independent temperature-sensitive interruption devices independently perform temperature sensing to temporarily shut off the circuit and to restore it, to completely shut it off, and prevent overcurrent, circuit overheating, and fire for safe use of electricity. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a circuit protection structure for performing double temperature-sensitive interruption, and in particular, an electric circuit is provided with a temperature-sensitive interruption device and a thermal fuse device to form two independent temperature-sensitive interruption structures, When the current is overheated, when the circuit is overheated, or when the ambient temperature is too high, the temperature-sensitive shut-off device forms a temporary shut-off state that can be energized (ON) or the fusible alloy of the thermal fuse device The present invention relates to a circuit protection structure that performs double temperature-sensitive interruption in which a permanent circuit interruption (OFF) state is formed by melting.

  The use of electric power is indispensable in the modern human society, and various electric products and facilities surround the living environment, especially computerized and computerized industries, living spaces, transportation, education, entertainment, etc. In this field, it will not be possible without electricity. In comparison, the safe use of electricity has become an important issue for modern people.

  In general, an entire electric circuit to which electricity is provided is provided with a main switch for controlling a power source. Normally, the main switch is energized (ON), and a fuse or a circuit breaker is installed there. When the electric circuit becomes overcurrent, short circuit, or overheated, the fuse blows or the circuit breaker trips and the entire circuit is cut off (OFF).

  In addition, a circuit protection structure may be separately provided in the entire circuit. Each individual circuit is provided with another switch for control, which performs energization (ON) and shut-off (OFF) of the current of each individual circuit to enhance the safety of electricity use. Many switches have a function that automatically shuts down the circuit when overcurrent occurs due to overcurrent. When overcurrent occurs, the fuse or breaker reacts immediately and the entire circuit cannot be shut off (turned off), causing the wire to ignite. To prevent.

  Some high-priced electronic products other than the above circuit or each individual circuit that has a structure that automatically shuts off (OFF) the circuit when overcurrent or overheated using fuses, circuit breakers and switches In data processing equipment or electric heaters that use a lot of electricity, a circuit protection structure with a temperature-sensitive circuit breaker is provided, and when an electric or electronic product is overcurrent or overheated, the circuit is immediately shut off. Prevents electrical and electronic products from burning out. In addition, the problem of electrical and electronic products causes the overcurrent state or overheat state of the entire circuit or individual circuits, and prevents other equipment in the circuit from operating.

  As shown in FIGS. 1 and 2, the temperature-sensitive shut-off protection device according to the prior art used for electronic products has an elastic contact plate 101 installed in the circuit, the elastic contact plate 101 is curved, and is deformed after receiving heat. Then bend. One end of the elastic contact plate 101 is fixed to the first terminal 102, and the other end of the elastic contact plate 101 is a free end. A first conductive point 103 is provided at the free end, a second conductive point 105 is fixed to the second terminal 104, and the second conductive point 105 corresponds to the first conductive point 103. At the time of implementation, the elastic contact plate 101 holds the curvature to the second terminal 104, and the first conductive point 103 at the free end of the elastic contact plate 101 and the second conductive point 105 of the second terminal 104 are in contact with each other. The energized state is maintained. As shown in FIG. 1, during an overcurrent, the elastic contact plate 101 receives heat and deforms and curves, and the first conductive point 103 and the second conductive point 105 at the free end of the elastic contact plate 101 are separated, The circuit is cut off (OFF). As shown in FIG. 2, the circuit of the electric product can thereby avoid burning, but the temperature-sensitive shut-off protection device according to the prior art has the following drawbacks.

(A) When the elastic contact plate 101 is manufactured, the thickness, the degree of curvature, and the structural characteristics of each elastic contact plate 101 cannot be made completely the same, so that the elastic contact plate 101 is deformed and curved after receiving heat. The reaction temperature cannot be controlled, and the sensitivity temperature setting error is large.
(B) The elastic contact plate 101 has low sensitivity to bend and bend after receiving heat, and cannot immediately protect the electric product when it is overcurrent or overheated.
(C) The elastic contact plate 101 cannot be immediately tripped or the trip is incomplete, and the circuit remains in an overheated state with the current conducting, and the electronic product and the entire circuit are in a dangerous state. It becomes.

When the elastic contact plate 101 is in a half-trip state when the circuit is overheated due to overcurrent, the elastic contact plate 101 returns to the energized state when the elastic contact plate 101 is cooled, and a spark is generated by repeated energization and interruption. And dangerous. In addition, electronic and electrical products in the entire circuit become unstable due to repeated energization and shut-down, resulting in downtime, failure to operate properly, shortening the service life, and complete damage in severe cases Resulting in.
JP-A-9-222357

The first object of the present invention is that the circuit can be completely shut off (OFF) by two independent temperature sensitive shut-off devices, each of which senses temperature independently during overcurrent or circuit overheating. Another object of the present invention is to provide a circuit protection structure that performs double temperature-sensitive shut-off, in which safety of electricity use is ensured by double temperature-sensitive shut-off.
The second object of the present invention is that when an overcurrent, a circuit is overheated, or when the environmental temperature is too high, first, the elastic contact plate of the temperature-sensitive circuit breaker receives heat, deforms and curves to cut off the circuit (OFF). In addition, it is not necessary to blow off the fusible alloy of the thermal fuse device to cut off the circuit (OFF), the overcurrent state is solved, and the elastic contact plate of the temperature sensitive cut-off device is cooled, then the energized (ON) state The circuit protection structure can be used continuously and there is no need to prepare a new circuit protection device. To provide a structure.
The third object of the present invention is to provide a temperature news device that is not over-reacted during overcurrent or circuit overheating, in which the temperature-sensitive device repeats no reaction, delays or shuts off (OFF), and energizes (ON). The fusible alloy receives heat and rises in temperature, and when it reaches a certain temperature, it blows, so the circuit is completely shut off (OFF), thereby ensuring the safety of electricity use and protecting the functions of various electrical products. It is an object of the present invention to provide a circuit protection structure that performs double temperature-sensitive interruption.

In order to solve the above-described object, the present invention provides a circuit protection structure that performs double temperature-sensitive interruption, and includes a lid, a temperature-sensitive interruption device, a thermal fuse device, and a base. The lid is a conductor and is connected to the first terminal. The temperature-sensitive shut-off device includes an elastic contact plate and a conductive connection portion, one end of the elastic contact plate is fixed inside the lid, and a first conductive point is provided at the free end. A second conductive point corresponding to the first conductive point is installed in the conductive connection portion. The thermal fuse device includes a conductor, an elastic member, and a fusible alloy. One side of the conductor is connected to the conductive connection portion by the fusible alloy, and the other side of the conductor is connected to the second terminal by the fusible alloy. The The elastic member is supported by the conductor and presses the conductor by elastic force. The conductive connecting portion, the conductor and the elastic member are fitted on the base. When overcurrent, overheating, or when the environmental temperature is too high, first, the temperature sensitive shut-off device is shut off (OFF), cooled, and then automatically restored to the energized (ON) state. When overcurrent, overheating, or environmental temperature is too high, if the temperature sensitive shut-off device does not immediately shut off (OFF) or cannot be shut off (OFF), the fusible alloy of the temperature fuse device will rise to the set temperature When it reaches, it melts, the conductor is pressed by the elastic force of the elastic member and separated from the second terminal, and the circuit is completely cut off (OFF).
That is, the present invention has the following features.
(1) A lid, a temperature sensitive shut-off device, a thermal fuse and a base are provided.
The lid is a conductor, and a first terminal is connected to the lid.
The temperature-sensitive shut-off device includes an elastic contact plate and a conductive connection portion, and the elastic contact plate is a metal plate body having elasticity, has an arc shape, and can be bent in both side surface directions of the plate body, When the elastic contact plate receives heat, it bends to the other side, one end of the elastic contact plate is fixedly joined to the inside of the lid, and a first conductive point is provided at the free end of the elastic contact plate, The conductive connection portion is a plate, and a second conductive point is installed on the upper surface thereof, and the second conductive point corresponds to the first conductive point,
The thermal fuse device includes a conductor, an elastic member, and a soluble alloy, one side of the conductor is connected and fixed to the conductive connection portion by a soluble alloy, and the other end of the conductor is made of a soluble alloy. The elastic member is supported by a conductor, and the elastic member is compressed to generate an elastic recovery force;
The storage body is provided with a storage tank, and the conductive connection portion, the conductor, and the elastic member are fitted into the storage tank,
In a normal state, the first conductive point and the second conductive point of the elastic contact plate of the temperature-sensitive shut-off device are kept in contact to form an energized (ON) state, and an overcurrent, a circuit overheat, or a use environment When the temperature is too high, the elastic contact plate of the temperature-sensitive shut-off device receives heat and deforms, curves in the opposite direction, the first conductive point and the second conductive point are separated, and the circuit is cut off (OFF). The elastic contact plate is bent again after cooling, the first conductive point and the second conductive point are in contact, and the circuit is in the energized (ON) state again.
When overcurrent, circuit overheating, or environmental temperature is too high, if the temperature sensitive shut-off device does not immediately shut off (OFF) or cannot be shut off (OFF), the fusible alloy of the thermal fuse device continues by receiving heat When the set temperature is reached, the fusible alloy is melted and the conductor is pressed by the elastic force of the elastic member to separate from the second terminal, and the circuit is completely cut off (OFF). A circuit protection structure that performs double temperature-sensitive shut-off, characterized by being in a state.
(2) The circuit protection structure for performing double temperature-sensitive interruption according to (1), wherein the elastic contact plate of the temperature-sensitive interruption device is a composite metal thin plate.
(3) The side surface of the conductive connection portion of the temperature-sensitive cutoff device is curved to form a side plate,
The circuit protection structure for performing double temperature-sensitive interruption according to (1), wherein one side of the conductor of the thermal fuse device is connected and fixed to a side plate of the conductive connection portion by a fusible alloy.
(4) The circuit protection structure for performing double temperature-sensitive interruption according to (1), wherein the elastic member of the thermal fuse device is a spiral spring.
(5) One end of the elastic member of the thermal fuse device is supported on the side wall of the storage tank, The circuit protection structure for performing double temperature-sensitive interruption according to (1).
(6) The double temperature-sensitive cutoff according to (1), wherein a clamping groove is provided on the side of the base body, and the second terminal is clamped and fixed in the clamping groove of the base body. Circuit protection structure that performs.
(7) The circuit protection structure for performing double temperature-sensitive interruption according to (1), wherein at least one ventilation opening is provided on a side of the lid.

When overcurrent, circuit overheating, or environmental temperature is too high, first, the elastic contact plate of the temperature-sensitive breaker receives heat, deforms and curves, shuts off the circuit (OFF), and the temperature-sensitive breaker does not react Alternatively, when the temperature continues to rise by repeating energization (ON) and shutoff (OFF), the fusible alloy of the thermal fuse device is blown, the conductor and the second terminal are separated, and the circuit is completely shut off ( OFF) is secured. The two independent temperature shut-off devices of the present invention each independently sense the temperature and can temporarily shut down the circuit to restore it again or shut it down completely, preventing overheating and ignition of the circuit. Prevent electricity and use electricity safely.

Embodiments showing the objects, features, and effects of the present invention will be described in detail with reference to the drawings.

FIG. 3 is an exploded perspective view showing an embodiment of the present invention. FIG. 4 is a perspective view showing the assembled state of the embodiment of the present invention. FIG. 5 is a plan view showing a state where the lid of the embodiment of the present invention is not installed. FIG. 6 is a cross-sectional view showing an embodiment of the present invention. The circuit protection structure that performs double temperature-sensitive interruption according to the present invention includes a lid body 10, a temperature-sensitive interruption device 20, a thermal fuse 30, and a base body 40.

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

  The temperature-sensitive cutoff device 20 includes an elastic contact plate 21 and a conductive connection portion 22. The elastic contact plate 21 is a metal plate having elasticity, has an arc shape, can be bent on both side surfaces of the plate, and is bent to the other side when the elastic contact plate 21 receives heat. The elastic contact plate 21 may be a composite metal thin plate. One end of the elastic contact plate 21 is fixedly joined to the inside of the lid body 10 described above, and a first conductive point 211 is provided at the free end of the elastic contact plate 21. The conductive connection portion 22 is a plate body, the second conductive point 221 is installed on the upper surface thereof, the joint hole 223 is provided, the second conductive point 221 corresponds to the first conductive point 211 described above, A side plate 222 is formed by curving the side surface of the conductive connection portion 22.

  The thermal fuse device 30 includes a conductor 31, an elastic member 32, and fusible alloys 33 and 33 '. The conductor 31 is a plate body, one side (left side) of which is connected and fixed to the side plate 222 of the conductive connecting portion 22 by a soluble alloy 33, and the other end (right side) of the conductor 31 is a soluble alloy 33 ′. Is connected to the second terminal. The elastic member 32 is supported by the conductor 31, and the elastic member 32 is compressed to generate an elastic recovery force and presses the conductor 31. In this embodiment, the elastic member 32 is a spiral spring.

  A storage tank 41 is provided in the base body 40, a convex portion 42 is provided in the storage tank 41, and a holding groove 43 is provided on the side of the base body 40.

  At the time of assembly, the joint hole 223 of the conductive connection part 22 is made to correspond to the convex part 42 in the storage tank 41 of the base body 40, and the conductive connection part 22, the conductor 31 and the elastic member 32 are fitted into the storage tank 41, The second terminal 34 is clamped and fixed in the clamping groove 43 of the base body 40. One end of the elastic member 32 is supported on the side wall of the storage tank 41, and the compressed elastic member 32 generates an elastic recovery force and presses the conductor 31.

  As shown in FIGS. 5 and 6, according to the present invention, in the normal state, the elastic contact plate 21 of the temperature-sensitive shut-off device 20 remains curved downward, and is electrically connected to the first conductive point 211 of the elastic contact plate 21. The second conductive point 221 of the part 22 is kept in contact, and the current flows from the first terminal 11 to the lid 10, the elastic contact plate 21, the first conductive point 211, the second conductive point 221, and the conductive connection part 22. Then, the current flows through a circuit of the fusible alloy 33, the conductor 31, the fusible alloy 33 ', and the second terminal 34 to be in an energized (ON) state.

  As shown in FIG. 7, when overcurrent, circuit overheating, or when the usage environment temperature is too high, the temperature sensitive shut-off device 20 temporarily shuts off (OFF), and the circuit is automatically energized after the temperature drops. Restore to the (ON) state. That is, the elastic contact plate 21 of the temperature sensitive shut-off device 20 receives heat and deforms, curves upward, the first conductive point 211 and the second conductive point 221 are separated, and the circuit is cut off (OFF). . As shown in FIG. 6, the elastic contact plate 21 of the temperature-sensitive shut-off device 20 is bent downward again after cooling, the first conductive point 211 and the second conductive point 221 are in contact, and the circuit is energized (ON). It becomes a state.

  Also, when overcurrent, circuit overheating, or environmental temperature is too high, the elastic contact plate 21 of the temperature-sensitive interrupting device 20 immediately curves upward and does not shut off (OFF) or cannot be shut off (OFF) When the fusible alloys 33 and 33 ′ of the thermal fuse device 30 are continuously cooled by receiving heat and reach the set temperature, the fusible alloys 33 and 33 ′ are melted and the conductor 31 is subjected to the elastic force of the elastic member 32. As shown in FIG. 8, it is pressed and separated from the second terminal 34, so that the circuit is completely cut off (OFF) and is not energized (ON) again.

  FIG. 9 shows a second embodiment of the present invention, wherein at least one ventilation opening 12 is provided on the side of the lid body 10 and communicates with the air current in the surrounding environment by the ventilation opening 12. The temperature sensitivity of the temperature sensitive shut-off device 20 and the thermal fuse device 30 is made more direct.

  In the present invention, when an overcurrent, a circuit is overheated, or when the environmental temperature is too high, first, the elastic contact plate 21 of the temperature-sensitive interrupting device 20 receives heat, deforms and curves, interrupts the circuit (OFF), and senses. When the temperature shut-off device 20 repeats no reaction, reaction delay or energization (ON), shut-off (OFF) and the temperature continues to rise, the fusible alloys 33 and 33 'of the temperature news device 30 are melted and the conductor 31 and the second terminal 34 are separated, and the circuit is completely cut off (OFF), and the circuit is restored again and is not energized (ON). The present invention is a circuit protection structure that performs double temperature-sensitive interruption provided with two independent temperature-sensitive interruption devices, and has a function of ensuring complete interruption (OFF) of an electric circuit.

  As can be seen from the above description, the structure of the present invention has utility, novelty and inventive step and meets the patent requirements.

  The above detailed description of the present invention shows preferred embodiments of the present invention and does not limit the scope of the present invention. All changes and modifications of the equivalent effects based on the claims of the present invention are included in the claims of the present invention.

It is sectional drawing which shows the circuit breaker by a prior art, and shows an electricity supply (ON) state. It is sectional drawing which shows the circuit breaker by a prior art, and shows a interruption | blocking (OFF) state. It is a disassembled perspective view which shows the Example of this invention. It is a perspective view which shows the state after the assembly of the Example of this invention. It is a top view which shows the state which has not installed the cover body of the Example of this invention, and shows an electricity supply (ON) state. It is sectional drawing which shows the Example of this invention, and shows an electricity supply (ON) state. It is sectional drawing which shows the Example of this invention, and shows the interruption | blocking (OFF) state of a temperature-sensitive interruption | blocking apparatus. It is a top view which shows the state which has not installed the cover body of the Example of this invention, It becomes the condition where it becomes the situation where a temperature-sensitive interruption | blocking apparatus does not interrupt | block immediately (OFF) at the time of overcurrent, or cannot be interrupted | blocked (OFF), This shows a state where the fusible alloy received heat and melted and the circuit was completely cut off (OFF). It is a perspective view which shows the 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cover body 11 1st terminal 12 Ventilation opening 20 Temperature-sensitive interruption | blocking device 21 Elastic contact board 211 1st conductive point 22 Conductive connection part 221 2nd conductive point 222 Side plate 223 Junction hole 30 Thermal fuse apparatus 31 Conductor 32 Elasticity Member 33, 33 'Soluble alloy 34 2nd terminal 40 Base body 41 Storage tank 42 Protruding part 43 Clamping groove

Claims (7)

It is equipped with a lid, a temperature sensitive shut-off device, a thermal fuse, and a base.
The lid is a conductor, and a first terminal is connected to the lid.
The temperature-sensitive shut-off device includes an elastic contact plate and a conductive connection portion, and the elastic contact plate is a metal plate body having elasticity, has an arc shape, and can be bent in both side surface directions of the plate body, When the elastic contact plate receives heat, it bends to the other side, one end of the elastic contact plate is fixedly joined to the inside of the lid, and a first conductive point is provided at the free end of the elastic contact plate, The conductive connection portion is a plate, and a second conductive point is installed on the upper surface thereof, and the second conductive point corresponds to the first conductive point,
The thermal fuse device includes a conductor, an elastic member, and a soluble alloy, one side of the conductor is connected and fixed to the conductive connection portion by a soluble alloy, and the other end of the conductor is made of a soluble alloy. The elastic member is supported by a conductor, and the elastic member is compressed to generate an elastic recovery force;
The storage body is provided with a storage tank, and the conductive connection portion, the conductor, and the elastic member are fitted into the storage tank,
In a normal state, the first conductive point and the second conductive point of the elastic contact plate of the temperature-sensitive shut-off device are kept in contact to form an energized (ON) state, and an overcurrent, a circuit overheat, or a use environment When the temperature is too high, the elastic contact plate of the temperature-sensitive shut-off device receives heat and deforms, curves in the opposite direction, the first conductive point and the second conductive point are separated, and the circuit is cut off (OFF). The elastic contact plate is bent again after cooling, the first conductive point and the second conductive point are in contact, and the circuit is in the energized (ON) state again.
When overcurrent, circuit overheating, or environmental temperature is too high, if the temperature sensitive shut-off device does not immediately shut off (OFF) or cannot be shut off (OFF), the fusible alloy of the thermal fuse device continues by receiving heat When the set temperature is reached, the fusible alloy is melted and the conductor is pressed by the elastic force of the elastic member to separate from the second terminal, and the circuit is completely cut off (OFF). A circuit protection structure that performs double temperature-sensitive shut-off, characterized by being in a state.   2. The circuit protection structure for performing double temperature-sensitive interruption according to claim 1, wherein the elastic contact plate of the temperature-sensitive interruption device is a composite metal thin plate. The side surface of the conductive connection portion of the temperature sensitive shut-off device is curved to form a side plate,
2. The circuit protection structure for performing double temperature-sensitive interruption according to claim 1, wherein one side of the conductor of the thermal fuse device is connected and fixed to a side plate of the conductive connection portion by a fusible alloy.   2. The circuit protection structure according to claim 1, wherein the elastic member of the thermal fuse device is a spiral spring.   The circuit protection structure for performing double temperature-sensitive interruption according to claim 1, wherein one end of the elastic member of the thermal fuse device is supported by a side wall of the storage tank.   2. A circuit for performing double temperature-sensitive interruption according to claim 1, wherein a holding groove is provided on the side of the base body, and the second terminal is fixedly held in the holding groove of the base body. Protective structure.   2. The circuit protection structure for performing double temperature-sensitive interruption according to claim 1, wherein at least one ventilation opening is provided on a side of the lid.

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