CN101685722B - Circuit protection structure with double temperature sensing power-off - Google Patents

Abstract

The invention provides a circuit protection structure with double temperature sensing power-off, wherein two independently operated temperature sensing power-off devices, a thermal sensing tripping device and a thermal 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; moreover, when the temperature of the circuit loop continuously rises due to overload current, overheating of the circuit or overhigh environment temperature, no response or repeated power failure or power on of the thermal induction tripping device, the fusible block of the thermal fuse circuit breaking device is further heated to be fused and broken to form circuit breaking of the circuit loop so as to cut off the power. 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 structure with double temperature sensing power-off

technical field

The present invention relates to a circuit protection structure with dual temperature induction power-off, which is provided with a thermal induction tripping device and a thermal fuse circuit breaker in the circuit loop to form two temperature-sensing power-off devices that operate independently; When the circuit is overheated or the ambient temperature is too high, the thermal induction tripping device is used to form a temporary power-off state that can be restored, or the fusible block of the thermal fuse device is further melted and broken to form a permanent circuit break. (OFF) state.

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 structures of temperature-sensitive breakers to protect the single electronic and electrical products. When the power is cut off by real-time induction, it can avoid burning the product itself. At the same time, it can avoid the current overload and overheating of the individual circuit loops and the overall circuit loop caused by the problem of a single electronic and electrical product, resulting in the circuit loop and the overall circuit loop. Other electrical equipment in the computer cannot work.

The existing temperature-sensing power-off protector used in a single electronic product, as shown in Figures 1-2, is provided with a contact elastic piece 101 in the circuit, and the contact elastic piece 101 is set to a curved shape, deformed and reversed after being heated. Bending and bouncing, one end of the contact spring is fixedly assembled on the first terminal 102, the other end of the contact spring 101 is a free end, the free end is provided with the first conductive point 103, and the second terminal 104 is fixedly assembled with the second conductive point. 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 of the free end of the contact elastic piece 101 is connected to the second terminal 104. The two conductive points 105 keep the circuit connection state of contact, as shown in Figure 1; when the current is overloaded, the contact elastic piece 101 is heated and deformed and reversely bent and bounces, so that the first conductive point 103 and the second conductive point at the free end of the contact elastic piece 101 are connected to each other. 105 is separated to form a circuit cut-off (OFF) state, as shown in Figure 2, which can ensure that the circuit of the electronic product itself is prevented from being 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

Technical problem to be solved:

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 the contact When the shrapnel cannot jump out in real time, the jumping is incomplete or cannot be tripped, the circuit continues 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, or even Various problems related to complete damage.

Technical means to solve the problem:

A circuit protection structure with dual temperature induction power cut off, comprising a cover, a thermal induction tripping device, a thermal fuse circuit breaker, and a base. The cover is a conductor and connected to a first terminal; the thermal induction tripping device includes a contact spring and a conductive connection part, one end of the contact spring is fixedly combined with the inner side of the cover, and a first conductive point is set at the free end. The conductive connection part is provided with a second conductive point corresponding to the aforementioned first conductive point; the thermal cut-off device includes a conductor and a fusible block, and one end of the conductive body is connected to the conductive connection part, and the fusible block is used to abut against the top The conductor makes the other end (free end) of the conductor movably contact with a second terminal; the conductive connection part, the conductor and the fusible block are integrated in the base body. When the current is overloaded, overheated or the ambient temperature is too high, it will first trip through the thermal induction tripping device, power off (OFF), and after the temperature drops, it will automatically recover to form the circuit connection (ON); when the current is overloaded, overheated or When the ambient temperature is too high and the thermal induction tripping device fails to trip in real time or fails to trip and power off (OFF), the fusible block of the thermal cutoff device will heat up due to continuous heating, and when it reaches the set temperature , melting and fragmentation, the free end of the conductor is separated from the second terminal, forming a completely de-energized (OFF) state of the circuit loop.

Beneficial effects of the invention:

The present invention is a circuit protection structure with dual temperature induction power-off, the main purpose of which is to use two independent temperature induction circuit breakers to sense the temperature independently when the current is overloaded or the circuit is overheated, so that the circuit circuit can be completely powered off (OFF) ), has a double temperature-sensing circuit breaker function to ensure the safety of electricity use.

Another object of the present invention is that 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 a thermal fuse The fusible block of the device is broken to achieve the power-off (OFF) of the circuit circuit, so it can be restored to the state of power-on (ON) after eliminating the overload factor of the circuit circuit, contacting the shrapnel to cool down, and the circuit protection structure can still be used continuously , no need to install a new circuit protector, saving time and reducing user expenses.

Another object of the present invention is that 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 when the temperature continues to rise due to repeated power failure (OFF) and power on (ON), further through the thermal fuse circuit The fusible block of the device will continue to heat up and melt and fracture when it is heated. When the fusible block reaches the set temperature critical value, it will melt and break, so that the circuit circuit will be completely disconnected (OFF), ensuring safe electricity use. Protect various electrical appliances in the circuit loop.

Description of drawings

Fig. 1 is the combined sectional view of prior art, and it shows the state of conduction (ON) of prior art;

Fig. 2 is the combined sectional view of prior art, and it shows the state of tripping power-off (OFF) of prior art;

Fig. 3 is the three-dimensional exploded view of the embodiment of the present invention;

Fig. 4 is the three-dimensional assembly diagram of the embodiment of the present invention;

5 is a schematic top view of an uncovered body according to an embodiment of the present invention, which shows the ON state of the embodiment of the present invention;

6 is a combined sectional view of an embodiment of the present invention, which shows the ON state of the embodiment of the present invention;

7 is a combined sectional view of an embodiment of the present invention, which shows a schematic diagram of tripping power-off (OFF) in a general state of the embodiment of the present invention;

Fig. 8 is a schematic top view of the uncovered body of the embodiment of the present invention, which shows the fusible function of the thermal cutout device when the thermal induction tripping device does not trip in time or fails to trip when the power is cut off when the current is overloaded in the embodiment of the present invention. When the block is heated, it melts and shatters, forming an indication of a complete power failure (OFF) of the circuit loop.

[Description of main component symbols]

10 cover

11 first terminal

20 thermal induction tripping device

21 contact shrapnel

211 The first conductive point

22 Conductive connection

221 second conductive point

222 notch slot

223 binding holes

30 thermal cut-off device

31 Conductor

310 tabs

311 Clamp groove

312 free end

32 fusible block

32’ residual fragments

33 Elastic parts

34 Second terminal

40 seat body

41 Storage slot

42 convex rod

43 Convex

44 clip groove

45 grooves

46 combo slots

101 contact shrapnel

102 first terminal

103 The first conductive point

104 Second terminal

105 second conductive point

Detailed ways

In order to disclose the purpose, characteristics and effects of the present invention in detail, the present invention is described in detail as follows through the following preferred specific embodiments, in conjunction with the accompanying drawings:

As shown in Figures 3 to 6, it is a three-dimensional exploded view, a three-dimensional combined view, a combined cross-sectional view, and a combined cross-sectional view of the embodiment of the present invention, which show the schematic representation of the power on (ON) of the embodiment of the present invention; a dual temperature induction switch of the present invention The electrical circuit protection structure 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 (approximately) plate-shaped, and a second conductive point 221 is arranged 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 cut-off device 30 includes a conductor 31 and a fusible block 32; the conductor 31 is generally in the shape of an elastic sheet, and at least two lugs 310 extend from one end (left end) of the side, and the lug 310 A clamping groove 311 is formed between them, and the protruding piece 310 is in fixed contact with the conductive connection portion 22 of the thermal induction tripping device 20 to be electrically connected. The other end of the conductor 31 is a free end 312; The conductor 31 makes the free end 312 of the conductor 31 contact a second terminal 34 to form an electrical connection, and the conductor 31 is pressed against by the fusible block body 32 so that the conductor 31 itself has the free end 312 and the second terminal 34. The elastic force of the separation of the two terminals 34; in addition, an elastic member 33 can be set on the side of the conductor 31 on a different side from the fusible block body 32, and the elastic member 32 is compressed and pushes the aforementioned conductor 31 with elastic recovery force, To increase the elastic force for separating the free end 312 of the conductor 31 from the second terminal 34 , in this embodiment, the elastic member 33 is a coil spring.

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 . In addition, a groove 45 is continuously arranged on the side of the receiving groove 41, and a combination groove 46 is arranged on the opposite side of the groove 45, and the side opening of the combination groove 46 is relatively small.

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 portion 22 and the conductor 31 are embedded in the housing groove 41 , and the second terminal 34 is fixedly clamped in the clamping groove 43 of the base 40 , and then insert the fusible block 32 into the groove 45 of the seat body 40 , push the conductor 31 through the fusible block 32 , so that the free end 312 of the conductor 31 elastically contacts the second terminal 34 . In addition, one end of an elastic member 33 can be combined with the combination groove 46 of the seat body 40, so that the other end of the elastic member 33 is pushed against the upper side of the conductor 31, and the compressed elastic member 33 generates an elastic restoring force to push the conductor 31, The free end 312 of the conductor 31 is separated from the second terminal 34 by the elastic force.

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 is connected to the circuit loop of the second terminal 34 via the cover body 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, and the free end 312. (ON) state, as shown in Figures 5 and 6.

When the current is overloaded, the circuit is overheated or the ambient temperature is too high, the thermal induction tripping device 20 will temporarily trip and power off (OFF), and after the temperature drops, it will automatically recover to form a circuit connection (ON) ; That is, the contact spring 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 OFF state, as shown in the figure 7. When the contact spring 21 of the thermal induction tripping device 20 cools down, it deforms again and bends backwards (downwards) to jump, so that the first conductive point 211 contacts the second conductive point 221, making the circuit into a connected (ON) state, as shown in the 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 fails to be deformed in real time or cannot be deformed by heat, reversely bends (upward) and trips, and the power is cut off (OFF) The fusible block body 32 of the thermal fuse device 20 continues to heat up due to continuous heating. After reaching the set temperature, the fusible block body 32 melts and breaks into residual fragments 32', as shown in FIG. 8 , The conductor 31 is able to separate the free end 312 from the second terminal 34 by its own elastic force, forming a completely de-energized (OFF) state of the circuit loop. In this embodiment, the elastic force of an elastic member 32 pushes the conductor 31 to force the free end 312 to separate from the second terminal 34, so as to ensure the complete power-off (OFF) state of the circuit loop, and will not return to power-on again. (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 block body 32 of the thermal fuse device 30 is further melted and broken to make the conductor 31 use its own elastic force or The conductor 31 is forced to be pushed up by the elastic member 33, so that the free end 312 of the conductor 31 is separated from the second terminal 34, forming a complete power-off (OFF) of the circuit loop, and the circuit loop can no longer be restored to an energized (ON) state. The invention has two independent temperature-sensing power-off settings, and is a circuit protection structure with double temperature-sensing power-off, which can ensure the effect of complete power-off (OFF) of the circuit loop.

From the above, the component structure and action relationship of the present invention do have practical effects, and it is a new design that has never been seen before. It is functional and progressive, so it has met the requirements of the invention of the patent law.

The present invention has been described in detail above, but the above descriptions are only preferred embodiments 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 (5)

1. A circuit protection structure with double temperature induction power-off, characterized in that it includes a cover, a thermal induction tripping device, a thermal fuse circuit breaker, and a base; wherein, The cover is made of conductive material and 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 roughly plate-shaped, and a first two conductive points, the second conductive point corresponds to the aforementioned first conductive point; The thermal cutoff device includes a conductor and a fusible block; the conductor is generally in the shape of an elastic sheet, one end of which is in fixed contact with the conductive connection part of the thermal induction tripping device and is electrically connected. The other end of the body is a free end; the fusible block body is pressed against the aforementioned conductor, so that the free end of the aforementioned conductor is in contact with a second terminal to form an electrical connection, and the aforementioned conductor is pushed against by the fusible block body. making the aforesaid electrical conductor itself have an elastic force to separate the free end from the second terminal; The seat body is provided with a containing groove; the aforementioned conductive connection part, conductor and fusible block 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 to reversely bend and trip off, 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; Furthermore, 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 cuts off the power, the fusible block of the thermal fuse device will continue to After being heated, the temperature continues to rise, and when the set temperature is reached, the fusible block melts and breaks, and the conductor separates the free end from the second terminal by its own elastic force, forming a complete power-off state of the circuit loop. 2 . The circuit protection structure with double temperature induction power-off as claimed in claim 1 , wherein the contact spring of the thermal induction tripping device is a composite metal sheet. 3 . 3. The circuit protection structure with double temperature induction power-off as claimed in claim 1, characterized in that, further: An elastic member is arranged on the thermal cut-off device; The seat body is provided with a combination groove; One end of the elastic member is embedded in the combination groove of the seat body, the elastic member is compressed and the other end is pressed against the conductor, and the aforementioned conductor is pushed up by the elastic restoring force, increasing the free end of the aforementioned conductor and the second terminal Elastic force of separation. 4 . The circuit protection structure with dual temperature-sensing power-off as claimed in claim 3 , wherein the elastic member of the thermal cut-off device is a coil spring. 4 . 5 . The circuit protection structure with double temperature induction power-off as claimed in claim 1 , wherein 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. 6 .

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