CN201465929U - Overcurrent protector with free tripping mechanism - Google Patents

Abstract

The utility model discloses an overcurrent protector with free tripping mechanism, which comprises a shell, a key, an elastic component, two wiring guide sheets and a memory alloy sheet. The key is arranged at the inner edge of an opening of the shell, and the bottom surface of the key is provided with a vertical rod. The elastic component is sleeved on the vertical rod, two ends of the elastic component respectively abut against a stop block arranged on the bottom surface of the key and the side wall surface in the shell, and the wiring guide sheets respectively penetrate through the shell. One end of the memory alloy sheet is connected with one of the wiring guide sheets, a first contact is arranged at the position corresponding to the upright pole at the free end of the memory alloy sheet, and a second contact is arranged at the position corresponding to the first contact at the other wiring guide sheet. The utility model discloses can prevent effectively because of the overheated and contact of overcurrent protector is unable separately the unexpected calamity that leads to smoothly.

Description

Overcurrent Protector with Free Trip Mechanism

technical field

The utility model relates to an overcurrent protector, in particular to an overcurrent protector with a free tripping mechanism. When the button is pressed, the overcurrent protector is in a conduction state, and a When the memory alloy sheet bears a current exceeding the load and exceeds a predetermined temperature, it can still trip freely due to the thermal memory effect, so that the two contacts that have conducted current in the overcurrent protector are separated, forming an open circuit, and avoiding accidents. accidental disaster.

Background technique

According to relevant survey data, there were 309 fires in Taipei City in 2008, among which fires were caused by electrical wires, accounting for about 40% of the overall proportion, and this data is comparable to the statistics in 2006 and 2007. It can be seen that the problem of fires caused by electric wires has remained high in the society, and the reason for electric wires to fire is generally that users put too many electrical products (such as: televisions, electric fans, refrigerators, microwave ovens, etc.) Electric lamps, etc.) are connected to the same power switch, so that the current carried by the power switch exceeds the load, causing the power switch and the wires connected to each electrical product to go out of fire, causing accidental disasters.

In order to prevent the occurrence of the above-mentioned accidental disaster, there is a kind of overcurrent protector that can be connected with the power switch, please refer to Fig. The wiring guide 12 and a second wiring guide 13 . The button 11 is arranged in a slot 100 of the casing 10, the top surface of the button 11 is exposed outside the casing 10, and a stop piece 110 is extended from the bottom surface of one side of the button 11, and the stop piece 110 is a high temperature resistant and insulated electrical Made of wood, a spring 15 is provided between the bottom of the key 11 and the bottom of the slot 100 . The first wire guide piece 12 and a second wire guide piece 13 are respectively disposed in the housing 10 , and one end of the first wire guide piece 12 and a second wire guide piece 13 protrudes out of the housing 10 . The overcurrent protector 1 is provided with a memory alloy sheet 14, one end of the memory alloy sheet 14 is connected to the other end of the first wiring guide 12, and the other end of the memory alloy sheet 14 is provided with a first contact 16, and the other end of the second wiring guide 13 is provided with a second contact 17 at a position corresponding to the first contact 16, and the memory alloy sheet 14 is in a bent state before reaching a predetermined temperature, so that the memory alloy sheet 14 The other end faces to a position adjacent to the second wiring guide 13 .

When the overcurrent protector 1 is in the closed state, the button 11 can be affected by the elastic force of the spring 15, so that the stop piece 110 can stay at the position between the first contact 16 and the second contact 17, so as to reliably block the current conduction. When the top surface of the button 11 is pressed and the stop piece 110 is driven to move downward, the curved memory alloy piece 14 will make the first contacts 16 and the second contacts 17 contact each other, and the current can be conducted, and the over-current protection The device 1 is in an open state, and the stop piece 110 is stuck under the first contact 16 and the second contact 17 because the first contact 16 and the second contact 17 are connected together, so that the button 11 cannot Through the elastic force of the spring 15, the upward displacement, and when the current suddenly increases, exceeding the preset load value, and the temperature of the memory alloy sheet 14 rises to exceed the predetermined temperature, the other end of the memory alloy sheet 14 will be dissipated due to the thermal memory effect. From the original state of bending towards the second wiring guide piece 13, the instantaneous reverse bending deformation makes the first contact point 16 and the second contact point 17 separate, and an open circuit is formed to automatically cut off the current. At this time, because the stopper piece 110 has No longer being stuck by the first contact 16 and the second contact 17, the key 11 can be affected by the elastic force of the spring 15, and smoothly upwardly displaced, so that the stop piece 110 can return to resting on the first contact 16 and the second contact. The position between the two contacts 17 is to prevent the memory alloy sheet 14 from being bent again due to the temperature drop, so that the overcurrent protector 1, the wires and the electrical products connected to it repeatedly receive current exceeding the preset load value , Therefore, it can effectively protect the overcurrent protector 1, the wires and the electrical products connected with it from being damaged, or the risk of fire may occur, and effectively improve the safety of the overcurrent protector 1 and electrical products in use.

Please refer to Figure 1, this kind of overcurrent protector 1 still has many disadvantages in actual use:

1. When the current suddenly rises, the temperature of the memory alloy sheet 14 rises, and deformation occurs so that the first contact 16 and the second contact 17 are separated, the stop piece 110 must be able to return to stay at the first contact 16 and the second contact. The position of the two contacts 17 is to effectively prevent the overcurrent protector 1, the electric wire and the electrical products connected to it from repeatedly receiving a current exceeding the preset load value, however, since the first contact 16 and the second contact 17 can be separated The distance is affected by the temperature of the memory alloy sheet 14 itself and changes. Therefore, the thickness of the stopper 110 for isolating the contacts 16, 17 is very important. If the thickness of the stopper 110 is too thick, Then when the current suddenly rises, the memory alloy sheet 14 is heated and deformed, and when the first contact 16 and the second contact 17 are separated, the stop piece 110 may be separated by the distance between the first contacts 16 and the second contacts 17. Too small to return to the position between the first contact 16 and the second contact 17 smoothly, causing the overcurrent protector 1, the wires and the electrical products connected to it to repeatedly receive current exceeding the preset load value, and in addition If the thickness of the stop piece 110 is too thin, the problem of breakage of the stop piece 110 will easily occur, causing the overcurrent protector 1 to lose its proper protection function, and it is impossible to successfully complete the breaking when the current is overloaded. electrical protection measures.

2. When the current suddenly rises, there is still a risk that the first contact 16 and the second contact 17 may not be separated smoothly, because when a foreign object is accidentally placed on the button 11, or the button 11 is separated from the casing When the gaps between the 10 have accumulated dirt for a long time, and the button 11 is not easy to be pushed, the button 11 will not be smoothly affected by the elastic force of the spring 15 and will move upward so that the stop piece 110 can return to stay at the first contact point 16 and the second contact point 17, so when the current exceeds the load value, the memory alloy sheet 14 will be connected at the first contact point 16 and the second contact point 17, and the temperature of its body will rise, causing deformation and making the second contact point 14 A joint 16 is separated from the second joint 17, and when the first joint 16 and the second joint 17 are separated, and the memory alloy sheet 14 body temperature is lowered, it returns to the state where the first joint 16 and the second joint 17 are connected. State, so that the overcurrent protector 1, the wire and the electrical products connected to it not only need to repeatedly receive the current exceeding the preset load value, but also because the first contact 16 and the second contact 17 are not properly isolated, And produce electric arc, cause the overcurrent protector 1, electric wire and the electrical product connected with it to be burned, even go off and cause the unexpected disaster of fire.

In summary, how to design an innovative over-current protector with a free tripping mechanism to improve the serious shortcomings of traditional over-current protectors, and design an over-current protector with high safety and improve the over-current protector The safety of the current protector in use makes the overcurrent protector still able to cut off the power normally when the current is too large and the button is stuck or pressed by foreign objects, effectively preventing the overheating caused by the overcurrent protector. Moreover, the unexpected disaster caused by the failure of the contact to be disconnected smoothly has become an important issue that manufacturers who manufacture and design overcurrent protectors with a free tripping mechanism are eager to solve.

Contents of the invention

The purpose of this utility model is to provide an overcurrent protector with a free tripping mechanism, which can effectively separate the contacts when the current suddenly rises and exceeds the preset load value. Thereby forming an open circuit to automatically cut off the current, and solve the problem that the overcurrent protector cannot normally complete the power off when the button of the overcurrent protector is stuck by dirt between it and the housing or pressed by foreign objects.

The utility model is in order to achieve above-mentioned purpose, the technical scheme that takes is:

An overcurrent protector with a free trip mechanism, including a housing, an elastic component, a memory alloy sheet and a metal shrapnel. One side of the housing is respectively pierced with a first wiring guide and a second wiring Guide piece, a button is installed at the opening on the other side of the housing, and a vertical rod is provided on the bottom of the button. The elastic component is sleeved on the vertical rod, and one end of the elastic component is against the bottom surface of the key, and the other end is against the bottom surface of the key. On a stop block set on the inner wall of the housing. The memory alloy sheet is set in the housing, and one end thereof is connected to the first wiring guide. A free end of the memory alloy sheet is provided with a first contact point. The first contact is located at the position corresponding to the pole, and the second wiring guide is provided with a second contact at the position corresponding to the first contact. One end of the metal shrapnel is movably overlapped at the position adjacent to one end of the memory alloy sheet , and its other end is movably lapped on the edge of the free end of the memory alloy sheet. When the button is pressed, the vertical rod will push the first contact to make the free end displace, and after overcoming the deformation critical stress of the free end , triggering the deformation of the free end, so that the contacts are in contact, so that the wiring guide piece is electrically conducted. At this time, since the elastic component will be squeezed between the button and the stopper, when the button is released When the elastic component is squeezed, the accumulated elastic force will also be released, so that the button will be displaced in a direction away from the first contact, so as to create a space for the free end to return to the state before deformation, and when the temperature of the memory alloy sheet is changed due to When the overload of the carrying current exceeds a predetermined temperature, the free end can return to the state before deformation due to the thermal memory effect, so that the contacts are separated and an open circuit is formed, so it can effectively prevent the overheating of the overcurrent protector Moreover, accidental disasters caused by the failure of these contacts to separate smoothly not only greatly improve the safety of the over-current protector, but also allow the industry to manufacture over-current protectors with high safety on the premise of saving design costs.

Further, the surrounding wall of the key is near the bottom end, and a clamping block is extended in the direction away from the vertical rod, so that the bottom end of the key can be clamped in the housing, so, because generally speaking , in order to make the vertical rod of the key can be separated from the first contact smoothly, when the industry manufactures the over-current protector, it is necessary to use an elastic component that can generate a large elastic force. Therefore, when the key is pressed and released, If the button and the elastic component are not firmly connected together, the button may be ejected out of the casing, however, the button is blocked by a blocking block, which can prevent the elastic component from being too elastic, causing the button to be ejected out of the casing , resulting in the problem that the overcurrent protector cannot be used again due to the lack of keys, or must be reassembled.

In addition, the overcurrent protector of the present invention is also provided with a limit assembly. When the key is pressed and the free end is triggered to deform, so that the contacts are in contact with each other, the other end of the memory alloy sheet will be in the same shape as the free end. Reverse deformation, at this time, the limit assembly can be against the other end of the memory alloy sheet, to limit the deformation state produced by the other end of the memory alloy sheet, so, due to the other end of the memory alloy sheet The deformation state of the memory alloy sheet can be limited when the temperature of the memory alloy sheet exceeds a predetermined temperature due to the overload of the carrying current, so the deformation of the free end will be suppressed synchronously, so that the free end can be sensitively and smoothly recovered To the state before deformation, each contact point is definitely separated to form an open circuit, which greatly improves the safety of the overcurrent protector. Furthermore, the overcurrent protector of the present invention is respectively provided with a first pressurizing assembly and a second pressurizing assembly at positions corresponding to the top surface and the bottom surface of the memory alloy sheet, and the first pressurizing assembly and the second wiring guide The pieces are fixedly connected together. When the key is pressed and the free end is triggered to deform, so that the contacts are in contact, the other end of the memory alloy piece will deform in the opposite direction to the free end. When each connection When the guide piece receives a surge from the outside (such as: in the event of an electrical short circuit or a lightning strike, a large current conducted by a metal wire, a ground wire, etc.), the surge can instantly generate a surge between each pressurized component. A magnetic field, the first pressing component attracts the second pressing component to displace downward, so that the deformation state generated by the other end of the memory alloy sheet is pressed by the second pressing component, and the free end is affected jointly , Instantly return to the state before the deformation, so that each contact is really separated, forming an open circuit, so it can effectively prevent accidental disasters caused by overheating of the overcurrent protector and the contact cannot be separated smoothly, greatly improving the overcurrent protection device security.

Description of drawings

FIG. 1 is a schematic diagram of a conventional overcurrent protector;

Fig. 2 is the schematic diagram of a preferred embodiment of the overcurrent protector with the free tripping mechanism of the utility model;

Fig. 3 is a three-dimensional sectional view of a preferred embodiment of the overcurrent protector with a free tripping mechanism of the present invention;

Fig. 4 is another schematic diagram of a preferred embodiment of the overcurrent protector with a free tripping mechanism of the present invention;

Fig. 5 is the schematic diagram of another preferred embodiment of the overcurrent protector with free tripping mechanism of the present invention;

FIG. 6 is another schematic diagram of another preferred embodiment of the overcurrent protector with free tripping mechanism of the present invention.

Detailed ways

Further illustrate structural feature of the present utility model below in conjunction with accompanying drawing.

Please refer to Fig. 2, the utility model overcurrent protector 2 comprises a housing 20, a button 21, an elastic component 22, a first wiring guide 23, a second wiring guide 24, a memory alloy sheet 25 and A metal shrapnel 26.

The button 21 is arranged on the inner edge of an opening 200 of the housing 20 , and the bottom surface of the button 21 is provided with an accommodating space 210 , and a vertical rod 211 is arranged in the accommodating space 210 , and one end of the vertical rod 211 is connected to the bottom surface of the button 21 , And the length of the upright rod 211 is greater than the peripheral wall of the button 21 .

The elastic component 22 is sheathed on the pole 211 , and one end of the elastic component 22 abuts against the bottom surface of the button 21 , and the other end abuts against a stopper 201 provided on the inner wall of the casing 20 .

The first wire guide piece 23 and the second wire guide piece 24 are respectively provided in the housing 20 at positions corresponding to the keys 21 , and one end of the first wire guide piece 23 and the second wire guide piece 24 protrudes out of the housing 20 . The other end of the first wire guide piece 23 is connected to one end of the memory alloy piece 25 .

A free end 250 of 25 on the memory alloy sheet is provided with a first contact 27 at the position adjacent to its end edge, and the first contact 27 is at the position corresponding to the vertical rod 211, and the other end of the second wiring guide 24 is at the position corresponding to the first contact. A second contact 28 is provided at the position of the contact 27 .

The metal dome 26 is U-shaped, one end of which is movably overlapped adjacent to one end of the memory alloy piece 25 , and the other end of the metal dome 26 is movably connected to the edge of the free end 250 of the memory alloy piece 25 .

When the user presses the top surface of the button 21, the other end of the vertical rod 211 can push the first contact point 27, so that the free end 250 is displaced, and after overcoming the deformation critical stress of the free end 250, the free end 250 is triggered to deform , so that the first contact point 27 and the second contact point 28 are in contact, thus, the first wiring guide piece 23 and the second wiring guide piece 24 are electrically conducted. Therefore, please refer to FIG. 3 , when the key 21 is released, the elastic force accumulated by the elastic component 22 will be released, so that the key 21 is displaced in a direction away from the first contact 27, and the vertical rod 211 The other end is separated from the first contact point 27 and separated from each other by a predetermined distance, creating a space for the free end 250 to return to the state before deformation. Please refer to FIG. 3 Press it down, or when the gap between the button 21 and the housing 20 has accumulated dirt and dirt for a long time, and the button 21 is not easy to be pushed, the free end 250 can still be used at the temperature of the memory alloy sheet 25 due to the overload of the carrying current. , and when it exceeds a predetermined temperature, due to the thermal memory effect, it returns to the state before the deformation, so that the first contact 27 and the second contact 28 are indeed separated to form an open circuit, so it can effectively prevent the overcurrent protector 2 from overheating and the second The accident caused by the inability to separate the first contact 27 and the second contact 28 greatly improves the safety of the overcurrent protector 2 , and enables the industry to easily design the overcurrent protector 2 with high safety.

In a preferred embodiment of the present utility model, please refer to FIG. 2 , the overcurrent protector 2 is also provided with a limiting component 290, which is located in the housing 20 corresponding to the upper end of the other end of the memory alloy sheet 25. s position. When the top surface of the button 21 is pressed and the free end 250 is triggered to deform, so that the first contact 27 and the second contact 28 are in contact, the other end of the memory alloy sheet 25 will deform in the opposite direction to the free end 250 , at this time, the limit assembly 290 can be against the other end of the memory alloy sheet 25 to limit the deformation of the other end of the memory alloy sheet 25, so that when the temperature of the memory alloy sheet 25 is too high When the load exceeds a predetermined temperature, since the deformation produced by the other end of the memory alloy sheet 25 is limited, the deformation of the free end 250 will be suppressed synchronously, so that the free end 250 can be sensitive due to the thermal memory effect. And smoothly return to the state before the deformation, the first contact 27 and the second contact 28 are really separated to form an open circuit, therefore, it can effectively prevent the overheating of the overcurrent protector 2 and the failure of the first contact 27 and the second contact 28 The accidental disaster caused by the smooth separation greatly improves the safety of the overcurrent protector 2 .

In another preferred embodiment of the present utility model, referring to Fig. 5 and Fig. 6, the overcurrent protector 2 also includes a first pressurizing assembly 291 and a second pressurizing assembly 292, the first pressurizing assembly 291 It is fixedly arranged at the other end of the second wire guide piece 24, and corresponds to the position below the other end of the memory alloy sheet 25, and one end of the second pressing component 292 is pivotally connected in the housing 20 adjacent to the first wire guide piece 23 The position of the other end, and the other end of the second pressing component 292 extends to the position corresponding to the position above the other end of the memory alloy sheet 25, is pressed on the top surface of the key 21, and triggers the deformation of the free end 250, so that the first Under the state that contact point 27 and second contact point 28 are in contact, the other end of memory alloy sheet 25 will produce the deformation that is opposite to free end 250, and pushes the other end of second pressing assembly 292 to move upwards, and when each first When the first wiring guide 23 and the second wiring guide 24 receive a surge from the outside (such as: when an electrical short circuit or a lightning strike occurs, a large current is conducted by a metal wire, a ground wire, etc.), the The surge can cause a magnetic field to be generated instantaneously between each first pressurizing assembly 291 and the second pressurizing assembly 292, and the other end of the second pressurizing assembly 292 can be attracted by the first pressurizing assembly 291 to move downward, so that the memory The deformation produced by the other end of the alloy sheet 25 is pressed by the second pressing component 292, so that when the overcurrent protector 2 receives a surge, the second pressing component 292 can press down on the memory The other end of the alloy sheet 25, and then the free end 250 is jointly affected, and instantly returns to the state before the deformation, so that the first contact 27 and the second contact 28 are separated to form an open circuit, therefore, it is possible to effectively prevent overcurrent. The accident caused by the overheating of the protector 2 and the inability to separate the first contact 27 and the second contact 28 greatly improves the safety of the overcurrent protector 2 .

In each embodiment, please refer to FIG. 2 , when the button 21 is pressed by the user and released, the vertical rod 211 can be separated from the first contact 27 smoothly. Adopt the elastic component 22 that can produce greater elastic force, so when the key 21 is pressed and released, if the key 21 and the elastic component 22 are not firmly connected together, the key 21 may be ejected from the shell Outside the body 20, the overcurrent protector 2 cannot be used again due to the lack of buttons 21, or must be reassembled. Therefore, the utility model extends in a direction away from the vertical rod 211 on the wall surface of the peripheral edge of the button 21 near the bottom end. A clamping block 212 enables the bottom end of the button 21 to be clamped in the housing 20 (as shown in Figure 3 ), so that the button 21 can effectively prevent the elastic force of the elastic component 22 from being too large by the clamping block 212. As a result, the button 21 is ejected out of the casing 20, thereby solving the aforementioned problems.

Please refer to Fig. 3 and Fig. 4, the overcurrent protector 2 of the present invention is mainly effective when the current suddenly rises and exceeds the preset load value, and the top surface of the button 21 is pressed by a foreign object 3; or When the gap between the button 21 and the housing 20 has accumulated dirt and dirt for a long time, and the button 21 is not easy to be pushed, the first contact 27 and the second contact 28 are still separated smoothly to form an open circuit to automatically cut off the current , effectively preventing accidental disasters caused by the overheating of the overcurrent protector 2 and the failure of the first contact 27 and the second contact 28 to be successfully disconnected, thereby greatly improving the safety of the overcurrent protector 2 and making it easier for the industry to Design and manufacture a high-safety overcurrent protector 2 to effectively save manufacturing costs.

The above are only preferred embodiments of the present utility model. The structural features of the utility model are not limited thereto. Those skilled in the art in the field of the utility model, according to the technical contents disclosed in the utility model, can easily think of equivalent changes, which should belong to the protection of the utility model. category.

Claims (7)

1. An overcurrent protector with a free tripping mechanism, characterized in that it comprises: a shell; A button is arranged on the inner edge of an opening of the housing, and the bottom surface of the button is provided with an accommodating space, and a vertical rod is arranged in the accommodating space, and one end of the vertical rod is connected to the bottom surface of the button; An elastic component is sheathed on the pole, and one end of the elastic component abuts against the bottom surface of the button, and the other end abuts against a stopper set on the inner wall of the casing; a first wiring guide, which is arranged in the housing, and one end of the first wiring guide protrudes outside the housing; A memory alloy sheet, one end of which is connected to the other end of the first wiring guide, a free end of the memory alloy sheet is provided with a first contact point adjacent to its end edge, and the first contact point is located at the position corresponding to the vertical rod ; A second wiring guide is arranged in the housing, one end of the second wiring guide protrudes outside the housing, and the other end of the second wiring guide is provided with a second contact at a position corresponding to the first contact ;and A metal shrapnel, one end of which is movably connected to a position adjacent to one end of the memory alloy sheet, and the other end of which is movably connected to the edge of the free end of the memory alloy sheet. 2. The overcurrent protector with a free tripping mechanism as claimed in claim 1, characterized in that: the overcurrent protector is also provided with a limiting component, and the limiting component is arranged in the housing corresponding to the memory alloy sheet The position above one end is pressed on the top surface of the button, and the free end is triggered to deform, so that when the contacts are in contact, the other end of the memory alloy sheet will deform in the opposite direction to the free end , at this time, the limiting component can abut against the other end of the memory alloy sheet to limit the deformation of the other end of the memory alloy sheet. 3. The overcurrent protector with a free tripping mechanism as claimed in claim 1, wherein the overcurrent protector further comprises: A first pressurizing component is fixedly arranged at the other end of the second wire guide piece and corresponds to a position below the other end of the memory alloy piece; and A second pressurizing component, one end of which is pivotally connected to the position adjacent to the other end of the first wiring guide in the casing, and the other end extends to a position corresponding to the upper end of the other end of the memory alloy sheet. 4. The overcurrent protector with a free tripping mechanism as claimed in claim 2 or 3, wherein the length of the upright rod is longer than the peripheral wall of the key. 5. The overcurrent protector with a free tripping mechanism as claimed in claim 4, characterized in that: the peripheral wall of the key is at a position adjacent to the bottom end, and a clamping block is extended in a direction away from the vertical rod, The bottom end of the button can be clamped in the housing. 6. The overcurrent protector with a free tripping mechanism as claimed in claim 5, wherein the wiring guide is located at a position corresponding to the button. 7. The overcurrent protector with a free tripping mechanism as claimed in claim 6, wherein said metal shrapnel is U-shaped.

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