CN1747098A - Dual Temperature Sensing Circuit Protector - Google Patents

Abstract

The invention relates to a double temperature induction circuit protector, which is characterized in that a contact spring sheet and a hot melting circuit breaker are arranged between two contact terminals of a circuit loop; when the current is overloaded or the circuit is overheated, the contact elastic sheet is heated to deform and reversely bend and jump off, so that the circuit is in a circuit breaking state, the fusible alloy is arranged in the hot-melt circuit breaking device, and when the current is overloaded or the circuit is overheated and the contact elastic sheet cannot timely deform and reversely bend and jump off to break, the fusible alloy of the hot-melt circuit breaking device is heated to melt and break.

Description

Dual Temperature Sensing Circuit Protector

technical field

The invention relates to a double temperature induction circuit protector, which is provided with a contact shrapnel and a thermal cutoff device in the circuit circuit; when the current is overloaded or the circuit is overheated, the contact shrapnel is deformed and reversely bent and tripped by heat, or thermal The melting of the fusible alloy of the fuse circuit breaker breaks the thermal fuse circuit breaker, and the circuit is in an OFF state, which has the effect of double temperature induction to achieve the circuit circuit breaker.

Background technique

The use of electricity has become an indispensable part of modern human society. The equipment that uses electricity surrounds the surroundings of life, especially the computerized and informationized industries, homes, transportation, education, entertainment, etc., without electricity.

The use of electricity and its equipment has created a convenient modern life. Relatively, the safe use of electricity is something modern people must be careful 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 various circuit loops in the overall circuit loop, and a control switch is set in the circuit loop. The switch mainly performs two functions of energizing (ON) and deenergizing (OFF) each current loop. 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 cut off the power or trip when the current is overloaded. , and there is a danger of wire fire.

In addition to the above-mentioned overall circuit loop and each circuit loop, using the current overload and overheating of the fuse, the breaker and the switch to automatically trip and power off the structure, some single electronic and electrical products, such as: high-priced electronic products, information equipment for processing data, etc. Or electric heating appliances with large power consumption, etc., are also equipped with circuit protection structures of temperature-sensitive breakers to protect the single electronic and electrical products. Inductively cut off the power to avoid burning the product itself. At the same time, it can avoid the current overload and overheating of other circuit loops and the overall circuit loop caused by the problem of a single electronic or electrical product, resulting in other circuit loops and overall circuit loops. Problems with electrical equipment not functioning.

A commonly used temperature-sensing power-off protector used in a single electronic product, as shown in Figure 1 and Figure 2, is to install a contact spring 201 in the circuit. The contact spring 201 is set in a curved shape, deformed and reversed after being heated Bending and bouncing, one end of the contact spring is fixed on the first terminal 202, the other end of the contact spring 201 is a free end, the free end is provided with a first conductive point 203, and a second conductive point 204 is fixed on the second terminal 204. point 205, the second conductive point 205 corresponds to the first conductive point 203; during implementation, the contact elastic piece 201 is bent toward the direction of the second terminal 204, so that the first conductive point 203 of the free end of the contact elastic piece 201 is connected to the second terminal 204 of the second terminal 204. The conductive point 205 maintains a contacted circuit connection state, as shown in Figure 1; when the current is overloaded, the contact elastic piece 201 is heated and deformed and reversely bent to bounce, so that the first conductive point 203 and the second conductive point 205 at the free end of the contact elastic piece 201 Separated to form a circuit cut (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 the temperature-sensing cut-off protector in the prior art are:

(a) When making the contact elastic piece 201, it is impossible to ensure that the thickness, curvature and structural characteristics of each contact elastic piece 201 are exactly the same, so it is difficult to effectively control the reaction temperature value of the contact elastic piece 201 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 201 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 201 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.

(d) When the current overload circuit is overheated, if the contact shrapnel 201 is in a semi-tripped state, it will jump back to the energized state when the contact shrapnel 201 cools down, and continue to repeatedly power on and off to form sparks, causing danger; and the overall current loop Due to repeated power-on and power-off of electronic and electrical equipment, the current is unstable, resulting in crashes or malfunctions, shortened service life, or even complete damage.

Contents of the invention

The technical problem to be solved by the present invention is to solve the shortcomings of the temperature-sensing power-off protector in the prior art on temperature sensing, especially because the thickness, curvature and structural characteristics of each contact shrapnel cannot be completely the same, resulting in contact shrapnel The reaction temperature value of reverse bending and bouncing due to thermal deformation cannot be effectively controlled, and the error of the induction temperature value of setting power-off is large. When the current is overloaded and overheated, the contact shrapnel cannot jump off the power in time or the trip is incomplete, so that the circuit still remains. If it is in a conduction state, it will cause overheating of the electronic product and the overall circuit, or generate sparks, causing danger, or repeated power-on and power-off, resulting in unstable current, causing the electronic product to crash or fail to operate normally, shortening the use of Life, or even complete damage.

In order to solve the above problems, the technical solution adopted in the present invention is:

A dual temperature-sensing circuit protector, which is provided with a contact spring and a thermal cut-off device between two contact terminals of the circuit circuit; when the current is overloaded or the circuit is overheated, the contact spring is deformed and reversed to bend and trip off when the current is overloaded or the circuit is overheated. To make the circuit into an open circuit state, the thermal fuse device is equipped with a fusible alloy. When the current is overloaded or the circuit is overheated and the contact shrapnel fails to deform in time, reverse bend and trip off and the power is cut off, the fusible alloy of the thermal fuse device will be It melts and fractures when heated, forming a completely de-energized (OFF) state of the circuit loop.

The purpose of the invention and the beneficial effect of the technical solution adopted:

The present invention is a dual temperature sensing circuit protector, the main purpose of which is to arrange a contact elastic piece and a thermal cut-off device between two contact terminals of the circuit circuit. When the current is overloaded or the circuit is overheated, the contact elastic piece is heated and The deformation reverse bends and jumps off, making the circuit into an open circuit state; or when the contact shrapnel fails to deform in time and reverse bends and jumps off and the power is cut off, the fusible alloy of the thermal fuse circuit breaker will melt and fracture due to continuous heating and heating, forming The complete power-off (OFF) state of the circuit loop has double temperature sensing to ensure the power-off effect.

Another purpose of the present invention is that when the current is overloaded and the circuit is overheated, the contact spring can respond quickly to deform and bend, and jump off freely, and become a power-off (OFF) state; when the contact spring is poorly constructed and cools down, it will jump back to power on again. During the state of (ON), continuous repeated power-on and power-off form the contact spark phenomenon and cause the risk of electric wire fire. At this time, the fusible alloy of the thermal-melt circuit breaker of the present invention can be heated and melted and fractured to become a complete circuit breaker ( OFF) state to ensure the safety of electricity use.

Description of drawings

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

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

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

FIG. 4 is a combined cross-sectional view of an embodiment of the present invention, which shows the state of the tripping power-off (OFF) of the embodiment of the present invention;

Fig. 5 is a three-dimensional exploded view of the main components of the embodiment of the present invention;

Fig. 6 is a combined cross-sectional view of the embodiment of the present invention, which shows that in the embodiment of the present invention, when the current is overloaded, the contact shrapnel does not respond in time, and the fusible alloy 120 of the thermal fuse device is heated and melted and fractured, forming a power failure (OFF) state;

FIG. 7 is a combined cross-sectional view of the second embodiment of the present invention, which shows the ON state of the second embodiment.

in the picture

10 box body 11 contact shrapnel

111 The first conductive point 12 Thermal cut-off device

120 Fusible Alloy 120' Fusible Alloy Wire

121 second conductive point 122 extension piece

123 boards 13 first contact terminal

131 Rivet 14 Second contact terminal

15 Elastic parts (coil springs) 201 Contact shrapnel

202 first terminal 203 first conductive point

204 second terminal 205 second conductive point

Detailed ways

In order to disclose the purpose, features 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 Figure 3 and Figure 4, it is a combined cross-sectional view of the embodiment of the present invention, which shows the state of power-on (ON) and power-off (OFF) of the embodiment of the present invention, and Figure 5 is a partial perspective exploded view of the embodiment of the present invention ; A double temperature sensing circuit protector of the present invention, which mainly includes a contact shrapnel 11, a thermal cut-off device 12; wherein,

The contact spring 11 is an elastic metal sheet, which is formed into a curved arc and can jump to the two sides of the sheet. When the contact spring 11 is heated, it deforms and bends in reverse and bounces to the other side; the contact spring 11 can be Composite metal sheet; one end of the contact elastic piece 11 is fixedly arranged on the first contact terminal 13, in this embodiment, the rivet 131 is riveted and fixed, and the first contact terminal 13 is assembled in the hollow box body 10; the free end of the contact elastic piece 11 A first conductive point 111 is provided.

The cover of the thermal cut-off device 12 is an L-shaped plate, one end of which is fixed and riveted on the second contact terminal 14 with a fusible alloy 120, and the second contact terminal 14 is assembled in the hollow box body 10; the thermal cut-off device 12 is set The second conductive point 121 corresponds to the first conductive point 111 of the contact spring 11 . In addition, an extension piece 122 can be set at the fixed end of the thermal fuse device 12, and an elastic member 15 is compressed and abutted between the lower side of the extension piece 122 and the box body 10. In this embodiment, the elastic member 15 is a coil spring; The lower part of the circuit device 12 abuts against a plate 123, referring to Fig. 5, a groove 124 is formed on the plate 123, and the groove 124 corresponds to the middle section of the thermal circuit breaker 12, so that both sides of the thermal circuit breaker 12 Taking the groove 124 as a fulcrum, it is in the shape of a seesaw.

In the normal implementation state of the present invention, the contact spring 11 is bent downward, so that the first conductive point 111 of the contact spring 11 is kept in contact with the second conductive point 121 of the thermal cutoff device 12 (ON) state, as shown in FIG. 3 shown.

When the current is overloaded or the circuit is overheated, the contact shrapnel 11 is heated and deformed to reversely bend (upward) and jump off, and the first conductive point 111 is separated from the second conductive point 121, making the circuit in an OFF state, as shown in Figure 4 Show.

When the current is overloaded or the circuit is overheated, if the contact shrapnel 11 fails to be deformed in time or reversely bends (upward) and jumps off and the power is cut off, the fusible alloy 120 of the thermal cutoff device 12 will heat up continuously and reach a certain level. After the temperature is reached, the fusible alloy 120 melts and fractures, causing the thermal cut-off device 12 to drop, and the second conductive point 121 is separated from the first conductive point 111 contacting the shrapnel 11, as shown in Figure 6, forming a complete power-off of the circuit loop ( OFF) state.

In the present invention, when the current is overloaded or the circuit is overheated, the contact spring 11 is heated and deformed to reversely bend (upward) and jump off to cut off the power, and the fusible alloy 120 of the thermal fuse circuit breaker 12 is melted and fractured to cut off the power. The power setting can achieve the effect of ensuring complete power failure.

In addition, please refer to FIG. 6 , in order to further ensure the power-off action of the thermal cutoff device 12 , the extension piece 122 of the thermal cutoff device 12 abuts against an elastic member 15 , and at the same time abuts against the middle section of the thermal cutoff device 12 . Connected to the groove 124 of a plate 123, please refer to Fig. 5, so that both sides of the thermal cut-off device 12 can swing like a seesaw with the groove 124 as the fulcrum; when the fusible alloy of the thermal cut-off device 12 When 120 is heated and melts and breaks, the stretching force of the elastic member 15 will push up the extension piece 122, so that the thermal cutoff device 12 swings clockwise with the groove 124 of the plate 123 as the fulcrum, and the right end of the thermal cutoff device 12 is downward. , the second conductive point 121 is separated from the first conductive point 111 to be in an OFF state.

Please refer to FIG. 7, which is the second embodiment of the present invention, wherein the thermal cut-off device 12 and the second contact terminal 14 are bound and fixed by a fusible alloy wire 120'; The state is the same as the previous embodiment.

From the above, the component structure and action relationship of the present invention do have practical effects, and it is an unprecedented new design with practicability and creativity, so it meets the requirements of the invention of the patent law, so it is legally proposed Apply. For this reason, I would like to ask your examiner to review it in detail, and pray for the patent to be granted as soon as possible.

The present invention has been described in detail above, but what is described above 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 scope of application of the present invention shall still fall within the scope of the patent of the present invention.

Claims (6)

1. A dual temperature sensing circuit protector, characterized in that the protector mainly includes a contact shrapnel and a thermal cut-off device; wherein, The contact shrapnel is an elastic metal sheet body, which is formed into a curved arc and can jump to the two sides of the sheet body. When the contact shrapnel is heated, it deforms and bends in reverse and bounces to the other side; On the contact terminal, the free end of the contact spring is provided with a first conductive point; One end of the thermal cut-off device is fixed to the second contact terminal with a fusible alloy, the thermal cut-off device is provided with a second conductive point, and the second conductive point corresponds to the first conductive point of the contact spring; In the normal use state, the first conductive point of the contact shrapnel is kept in contact with the second conductive point of the thermal cut-off device; when the current is overloaded or the circuit is overheated, the contact shrapnel is heated and deformed, reversely bends and jumps off, and the first The conductive point is separated from the second conductive point, making the circuit into an open circuit state; When the current is overloaded or the circuit is overheated, if the contact shrapnel fails to deform in time or cannot be deformed and reversed to bend and trip off and the power is cut off, the fusible alloy of the thermal fuse device will continue to heat up, causing the fusible alloy to melt and fracture. The fuse circuit device falls, and the second conductive point is separated from the first conductive point contacting the shrapnel, forming a complete power-off state of the circuit loop. 2. The dual temperature sensing circuit protector as claimed in claim 1, wherein the contact spring is a composite metal sheet. 3. The dual temperature sensing circuit protector as claimed in claim 1, wherein an extension piece is provided at the fixed end of the thermal cutoff device, and the extension piece abuts against an elastic member. 4. The dual temperature sensing circuit protector as claimed in claim 3, wherein the elastic member is a coil spring. 5. The dual temperature-sensing circuit protector as claimed in claim 1, wherein the middle section of the thermal cut-off device abuts against a plate, so that both sides of the thermal cut-off device are in the shape of a seesaw with the plate as a fulcrum. 6. The dual temperature sensing circuit protector as claimed in claim 1, wherein one end of the thermal cut-off device is fixed to the second contact terminal by a fusible alloy wire.

Images