CN104037030B - Safety device with U-shaped memory alloy - Google Patents

Abstract

The present invention proposes a safety device with a U-shaped memory alloy. The safety device with a U-shaped memory alloy includes: a U-shaped memory alloy, a switching table, a conductive card slot and an insulating vertical isolation surface. , the second straight line segment is clamped on the bottom of the conductive slot, and at the second memory position, the second straight line segment crosses the first sliding surface and the second sliding surface, and is clamped on the insulating Vertical isolation surface. The invention well solves the problem that the shape memory alloy undergoes recovery deformation and then connects the circuit again after the circuit is disconnected, making the use process safer and more reliable.

Description

Safety device with U-shaped memory alloy

technical field

The invention relates to a safety device with U-shaped memory alloy.

Background technique

At present, traditional fuses are used as overcurrent and overheating protection, which can effectively prevent electrical appliances from overheating when the circuit goes wrong, and protect electrical components from being damaged. However, traditional fuses still have many limitations. One of them is that most fuses are disposable. , can no longer be used after fusing. Thus, a shape memory alloy fuse appeared.

The problem with the existing shape memory alloy fuse is that the shape memory alloy is deformed when the current is too high, and the circuit is disconnected. When the circuit is connected, after the circuit is connected, due to the original high current, the shape memory alloy will deform and disconnect the circuit again. In this cycle, the power supply will be turned on repeatedly, resulting in the disadvantage of unstable use and potential safety hazards.

Contents of the invention

The invention provides a safety device with a U-shaped memory alloy to solve the problem of unstable use of the existing fuse.

For this reason, the present invention proposes a kind of safety device with U-shaped memory alloy, and described safety device with U-shaped memory alloy comprises:

U-shaped memory alloy, the U-shaped memory alloy includes: a first straight line segment, a second straight line segment, and an arc segment connected between the first straight line segment and the second straight line segment, the first straight line segment There is a first end of a first straight line segment and a second end of the first straight line segment, the second straight line segment has a first end of a second straight line segment and a second end of the second straight line segment, and the arc segment connects Between the first end of the first straight segment and the first end of the second straight segment, the second end of the first straight segment and the second end of the second straight segment form a U-shaped opening; The U-shaped memory alloy has a first memory position and a second memory position, and the U-shaped opening at the second memory position is larger than the U-shaped opening at the first memory position;

A switching platform, the switching platform includes: a metal support platform and an insulating isolation platform adjacent to the metal support platform in the horizontal direction;

The conductive card slot is arranged on the top of the metal support platform, the conductive card slot is an open slot with a first sliding surface, the second straight line segment can be clamped on the bottom of the conductive card slot, and the first A sliding surface is a curved surface or an inclined surface, the bottom of the first sliding surface is connected to the bottom of the conductive slot, and the top of the first sliding surface is higher than the bottom of the conductive slot;

The second sliding surface is arranged on the top of the insulating isolation table, the second sliding surface is a curved surface or an inclined surface, the bottom end of the second sliding surface is connected to the top of the first sliding surface, and the top of the second sliding surface is higher than the top of the first sliding surface. 2. The bottom end of the sliding surface;

an insulating vertical separation surface, vertically connected below the top end of the second sliding surface, the height of the insulating vertical separation surface is greater than the height of the second straight line segment;

In the first memory position, the second straight line segment is clamped on the bottom of the conductive slot, and in the second memory position, the second straight line segment crosses the first sliding surface and the second sliding surface. surface, snapped on the vertical isolation surface of the insulation.

Further, the safety device with U-shaped memory alloy also includes:

A circuit bottom plate arranged under the switchboard, the circuit bottom plate supports the switchboard, and the metal support platform and the insulating isolation platform are arranged on the circuit bottom plate in parallel;

a fixed block arranged on the circuit base plate, the first straight line segment is arranged on the fixed block;

The alarm circuit is arranged on the circuit base plate. The alarm circuit has two connection ends. The first end of the alarm circuit is connected to the first end of the first straight line segment. The two ends are connected to the second end of the second straight line segment, and the alarm circuit forms a path;

The protected circuit has two connection ends, the first end of the protected circuit is connected to the first end of the first straight line segment, and the second end of the protected circuit is connected to the second straight line segment at the first memory position The second end of the alarm circuit forms an open circuit, and the protected circuit forms a path.

Further, the alarm circuit includes: a power supply arranged on the circuit bottom board, a buzzer 5 arranged on the circuit bottom board and connected to the power supply, a buzzer 5 arranged on the circuit bottom board and located in the deformation zone of the U-shaped memory alloy A conductive rod, the second end of the alarm circuit is the conductive rod.

Further, the alarm circuit further includes: an LED lamp 6 arranged on the circuit base and connected to the power supply.

Further, the safety device with U-shaped memory alloy further includes: a cold air pipe for auxiliary recovery deformation, which is sleeved outside the arc segment.

Further, the safety device with U-shaped memory alloy also includes: a return card slot capable of clamping the second straight line segment, which is arranged under the conductive card slot and on the circuit bottom plate, and the return card The slot is a side opening slot, and the opening of the restoring card slot extends to the insulating vertical separation surface. In the clamping position of the restoring card slot, the U-shaped memory alloy is in the first memory position .

Further, the power supply is a button battery.

1. In the case of normal energization, the current of the protected circuit flows in from the second end of the first straight section of the U-shaped memory alloy (shape memory alloy), and flows out from the second end of the second straight section through the conductive card slot , when the current in the protected circuit is too large, the U-shaped memory alloy temperature rises and deforms, the U-shaped opening expands, and the second straight line bounces along the first sliding surface of the conductive card slot, and passes over the first The sliding surface and the second sliding surface are clamped on the insulating vertical isolation surface and fall on the side with insulating material, so as to disconnect the protected circuit and realize the protection function. When the temperature of the U-shaped memory alloy drops After returning to the normal temperature, the U-shaped memory alloy returns to the shape at normal temperature, that is, the U-shaped memory alloy is in the first memory position. At this time, if the U-shaped memory alloy is manually moved, the protected circuit can be connected normally again. Therefore, the U-shaped memory alloy can be reused normally and is stable in use.

2. The present invention refines the deformation of the entire U-shaped memory alloy to the position change of the second straight line segment 23, and only needs to consider the position change of the second straight line segment 23. By controlling the second straight line segment 23, the disconnection or The purpose of connecting the circuit is to simplify the U-shaped change model to a straight-line change model, and realize the function of using the U-shaped memory alloy to control the disconnection or connection of the safety device.

3. The present invention well solves the problem that the shape memory alloy undergoes recovery deformation after the circuit is disconnected and is connected to the circuit again, making the use process safer and more reliable. Moreover, the angular deformation range of the U-shaped memory alloy is fully utilized, and the overall space of the safety device with the U-shaped memory alloy is compact.

4. Furthermore, in order to speed up the frequency of use of the U-shaped memory alloy, the present invention speeds up the recovery speed of the U-shaped memory alloy by setting a cold air pipe for cooling the U-shaped memory alloy, in order to accelerate the recovery of the U-shaped memory alloy faster and more accurately Speed, in the present invention, the cold air pipe is a semi-circular ring, and is sleeved outside the arc section of the U-shaped memory alloy, so that the main deformation zone of the U-shaped memory alloy can be effectively cooled, and the recovery effect is better.

5. Furthermore, in order to prolong the service life of the U-shaped memory alloy and ensure the use accuracy of the U-shaped memory alloy, in the present invention, the U-shaped memory alloy can be deformed and After recovery, it can be in a natural standby state without being stretched. In this way, the problem of poor deformation accuracy caused by long-term stretching of the U-shaped memory alloy can be prevented.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a safety device having a U-shaped memory alloy according to a first embodiment of the present invention, wherein the casing is shown;

Fig. 2 is a schematic view of the working state of the safety device with U-shaped memory alloy according to the first embodiment of the present invention, wherein the shell is removed and the protected circuit is connected;

3 is a schematic view of the working state of the safety device with U-shaped memory alloy according to the first embodiment of the present invention, wherein the shell is removed and the protected circuit is disconnected;

Fig. 4 is a schematic circuit diagram of a safety device having a U-shaped memory alloy according to the first embodiment of the present invention, wherein the protected circuit is connected;

Fig. 5 is a schematic circuit diagram of a safety device with a U-shaped memory alloy according to the first embodiment of the present invention, wherein the alarm circuit is connected and the protected circuit is disconnected;

6 is a schematic structural view of a U-shaped memory alloy according to the first embodiment of the present invention;

7 is a schematic structural diagram of a switcher according to a first embodiment of the present invention;

8 is a schematic structural diagram of a U-shaped memory alloy according to a second embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a switcher according to a second embodiment of the present invention;

Explanation of reference numbers:

1. Shell 2, U-shaped memory alloy 20, cold air 21, first straight line segment 22, circular arc segment 23, second straight line segment 25, cold air duct 3, back cover 30 protected circuit 4 circuit base plate 5, buzzer 6 , LED lamp 7, power supply 8, fixed block 9, switch board 10, conductive rod 11, pin 91, metal support table 93, insulation isolation table 910, conductive card slot 9101, first sliding surface 930, second sliding surface 935 , vertical isolation surface 933, reply card slot

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

Embodiment one:

As shown in Figure 1, Figure 2 and Figure 3, the present invention proposes a safety device with a U-shaped memory alloy, and the safety device with a U-shaped memory alloy includes:

U-shaped memory alloy 2, as shown in Figure 6, said U-shaped memory alloy is a U-shaped rod, and U-shaped memory alloy includes: a first straight line segment 21, a second straight line segment 23, and a connection between said first straight line segment The arc segment 22 between the line segment and the second straight segment, the first straight segment 21 has a first end of the first straight segment and a second end of the first straight segment, and the second straight segment 23 has a second The first end of the straight line segment and the second end of the second straight line segment, the arc segment 22 is connected between the first end of the first straight line segment and the first end of the second straight line segment, the The second end of the first straight section and the second end of the second straight section form a U-shaped opening; the U-shaped memory alloy has a first memory position and a second memory position, and the U-shaped memory alloy in the second memory position The opening is larger than the U-shaped opening at the first memory position, the first memory position is the position of the U-shaped memory alloy at normal temperature or the natural state position, and the second memory position is high temperature (for example, 70 degrees, 80 degrees or 100 degrees The position under the multi-degree), relative to the first memory position, the second memory position is the state where the U-shaped opening expands;

The position of the first straight line segment 21 is fixed for example, like this, when the U-shaped memory alloy is deformed, the deformation region or interval is mainly reflected on the second straight line segment 23 and/or arc segment 22, and the result is that after deformation, the second The angle between the straight line segment 23 and the first straight line segment 21 changes, for example, the first straight line segment 21 and the second straight line segment 23 are parallel at the first memory position, and at the second memory position, the first straight line segment 21 and the second straight line segment The two straight line segments 23 form an included angle greater than 0 degrees. The present invention converts the deformation of the entire U-shaped memory alloy into the position change of the second straight line segment 23, and only needs to consider the position change of the second straight line segment 23. By controlling the second straight line segment Section 23, the purpose of disconnecting or connecting the circuit can be completed, so that the U-shaped change model is simplified to a straight-line change model, and the function of using the U-shaped memory alloy to control the disconnection or connection of the safety device is realized;

The switching station 9 is used for correspondingly connecting with the U-shaped memory alloy 2 in the two states of the first memory position and the second memory position;

As shown in FIG. 7 , the switching platform includes: a conductive metal support platform 91 and an insulating isolation platform 93 adjacent to the metal support platform in the horizontal direction;

The conductive card slot 910 is arranged on the top of the metal support platform 9, that is, the material of the conductive card slot 910 is conductive metal, and the conductive card slot 910 is an open slot with a first sliding surface 9101, and the second The straight line section 23 can be clamped on the bottom of the conductive card slot 910, the first sliding surface 9101 is a curved surface or an inclined surface, such as a smooth curved surface, and the bottom end of the first sliding surface 9101 is in contact with the bottom of the conductive card slot. The bottoms are connected, and the top of the first sliding surface is higher than the bottom of the conductive slot;

The second sliding surface 930 is arranged on the top of the insulating isolation table 93, the second sliding surface is a curved surface or an inclined surface, the bottom end of the second sliding surface is connected to the top of the first sliding surface, and the top of the second sliding surface is as high as At the bottom end of the second sliding surface; the second sliding surface 930 is connected smoothly with the first sliding surface 9101, for example;

The insulating vertical isolation surface 935 is arranged on the side of the insulating isolation platform 93 and is vertically connected under the top of the second sliding surface 930. The height of the insulating vertical isolation surface 930 is greater than that of the second straight line segment The height of the vertical isolation surface 935 plays the role of clamping and limiting the second straight section 23 in the second memory position, preventing the second straight section 23 of the U-shaped memory alloy from naturally returning to the conductive slot 910 middle;

As shown in Figure 2, at the first memory position, the second straight line is snapped to the bottom of the conductive slot, as shown in Figure 3, at the second memory position, the second straight line The segment passes over the first sliding surface and the second sliding surface, and is clamped on the insulating vertical separation surface. That is, the second straight section 23 of the U-shaped memory alloy is clamped or positioned at the bottom of the conductive slot at the first memory position, and at the second memory position, the second straight section 23 of the U-shaped memory alloy is locked. Connected or positioned on the vertical isolation surface 935.

In the case of normal energization, the current of the protected circuit flows in from the second end of the first straight section of the U-shaped memory alloy (shape memory alloy), and flows out from the second end of the second straight section through the conductive card slot. When the current in the protected circuit is too large, the temperature of the U-shaped memory alloy rises and deforms, the U-shaped opening expands, and the second straight line bounces along the first sliding surface of the conductive card slot and passes over the first sliding surface And the second sliding surface, clamped on the vertical isolation surface of the insulation, falls on the side with insulating material, so in order to disconnect the protected circuit, the protection function is realized. When the temperature of the U-shaped memory alloy drops, the recovery After reaching the normal temperature, the U-shaped memory alloy returns to the shape at normal temperature, that is, the U-shaped memory alloy is in the first memory position. At this time, if the U-shaped memory alloy is artificially moved, the protected circuit can be connected normally again , The U-shaped memory alloy can be reused normally.

Further, as shown in Figure 1, the safety device with U-shaped memory alloy also includes:

The circuit bottom plate 4 arranged under the switching table, the circuit bottom plate 4 supports the switching table 9, and the metal support table 91 and the insulating isolation table 93 protrude from the circuit bottom plate in parallel;

The fixed block 8 arranged on the circuit base plate 4, the first straight section 21 is arranged on the fixed block 8, and the fixed block 8 fixes the first straight section 21, so that when the U-shaped memory alloy deforms , only need to consider the position change of the second straight line segment 23, by controlling the second straight line segment 23, the control of the working circuit or the protected circuit can be completed; the first straight line segment 21 is fixed in the fixed block 8 by screws, for example;

The alarm circuit is arranged on the circuit base plate. The alarm circuit has two connection ends. The first end of the alarm circuit is connected to the first end of the first straight line segment 21. In large cases, as shown in Figure 3 and Figure 5, the second end of the alarm circuit is connected to the second end of the second straight line section 23, the alarm circuit forms a path, and the protected circuit is disconnected;

The protected circuit 30 or the working circuit has two connection ends, the first end of the protected circuit is connected to the first end of the first straight line segment 21, in the first memory position, that is, under normal current conditions, such as As shown in Fig. 2 and Fig. 4, the second end of the protected circuit is connected to the second end of the second straight line segment 23, the alarm circuit forms an open circuit, and the protected circuit forms a path.

In the above technical solution, the alarm circuit and the protected circuit are switched and connected, that is, when the alarm circuit is connected, the protected circuit is disconnected, and when the alarm circuit is disconnected, the protected circuit is connected, and only one of the alarm circuit and the protected circuit is connected. , through the switching of the alarm circuit and the protected circuit, it is more convenient for the staff to check and maintain the circuit.

Further, as shown in Fig. 2 and Fig. 3, the alarm circuit includes: a power supply 7 arranged on the circuit backplane, a buzzer 5 arranged on the circuit backplane and connected to the power supply, arranged on the circuit backplane and located at The conductive rod 10 in the deformation zone of the U-shaped memory alloy, the second end of the alarm circuit is the conductive rod. The buzzer 5 is used for buzzing, which can have a better alarm function.

As shown in FIG. 4 , the second straight line segment 23 forms a conductive connection with the pin 11 , and the protected circuit 30 is a path. At the same time, the second straight line segment 23 is disconnected from the conductive rod 10 , and the alarm circuit forms an open circuit. As shown in FIG. 5 , the second straight section 23 forms a conductive connection with the conductive rod 10 , and the alarm circuit forms a path. At the same time, the second straight section 23 is disconnected from the pin 11 , and the protected circuit 30 is disconnected. Further, the power supply 7 is a button battery, which is convenient for manufacture and installation.

When in the second memory position, the U-shaped memory alloy is deformed. Since the first straight section 21 is fixed, the deformation of the U-shaped memory alloy 2 is mainly reflected in the angle change of the second straight section 23, that is, the second straight section 23 is at least Rotation occurs, the conductive rod 10 is arranged in the interval where the second straight line segment 23 rotates, so that the conductive rod 10 forms a contact connection with the second straight line segment 23, and forms an alarm circuit to communicate. In order to have a better alarm effect, the components play The deformation of the U-shaped memory alloy can set the conductive rod 10 in the end region where the second straight section 23 rotates, for example, make the contact point of the conductive rod 10 and the second straight section 23 be located at a distance of 23 from the second straight section 23. within one-fifth of the second end.

Further, as shown in FIG. 2 , the alarm circuit further includes: an LED lamp 6 arranged on the circuit bottom plate and connected to the power supply, for issuing a visual alarm.

As shown in Fig. 1, the safety device with U-shaped memory alloy of the present invention also includes: transparent plastic shell 1 and back cover 3, there are two chutes in the transparent plastic shell 1 for the insertion of circuit base plate 4; lead wire, and lead out two pins 11; the plastic back cover 3 has two small holes for the pins 11 to protrude from. The transparent plastic shell 1 and the back cover 3 form a cylindrical or semi-cylindrical protective shell to protect the alarm circuit.

In the case of normal electrification, the current flows in from the left pin 11 , passes through the first straight line segment 21 from the fixed block 8 , and then flows out from the other end pin 11 through the conductive slot 9 . When the current in the circuit is too large, the temperature of the shape memory alloy rises and deforms, bounces off along the arc-shaped first sliding surface of the conductive card slot 9, and falls on the outside of the vertical isolation surface 935, thus disconnecting the protected circuit At the same time, the second straight line section 23 bounces off and contacts the conductive rod 10, and the alarm circuit is connected. At this time, the buzzer sounds and the LED light is on, which plays the role of alarm prompt.

Embodiment two:

A main difference between this embodiment and the first embodiment is that, as shown in FIG. 8 , the safety device with U-shaped memory alloy also includes: a cold air pipe 25 for auxiliary recovery deformation, sleeved on the arc segment 22 In addition, the cold air 20 is used to cool the arc segment 22 and flows from one end of the arc segment 22 to the other end. Certainly, the direction of the cold air 20 may also be to flow from the middle of the arc segment 22 to both ends.

This is to speed up the frequency of use of the U-shaped memory alloy, and accelerate the recovery speed of the U-shaped memory alloy by setting a cold air pipe for cooling the U-shaped memory alloy. In order to accelerate the recovery speed of the U-shaped memory alloy faster and more accurately, the present invention Among them, since the first straight line segment 21 is fixed and the second straight line segment 23 is a position changing part, the position recovery of the U-shaped memory alloy in the present invention mainly focuses on the position control of the second straight line segment 23, wherein the second straight line segment 23 is a position change part. The main reason for the position change of the straight line section 23 is due to the deformation of the arc section 22, so the present invention uses the cold air pipe as a semicircular ring, and is sleeved outside the arc section 22 of the U-shaped memory alloy, which can effectively Cooling the main deformation zone of the U-shaped memory alloy can effectively control the position of the second straight line segment 23, and the recovery effect is better.

Furthermore, another main difference between this embodiment and the first embodiment is that, as shown in Figure 9, the safety device with U-shaped memory alloy also includes: a restoring card slot capable of clamping the second straight line segment 933, arranged under the conductive card slot 910 and above the circuit base 4, the recovery card slot 933 is a side opening slot, and the opening of the recovery card slot extends to the insulating vertical isolation surface 935 Above, the U-shaped memory alloy is in the first memory position at the clamped position of the return card slot 933 .

The material of the return card slot 933 is an insulating material, such as the same insulating material as the vertical isolation surface 935. During manufacture, the bottom of the insulating isolation platform 93 of the first embodiment is extended toward the metal support platform 91, or the metal support platform 91 is The bottom of the bottom is shrunk, and the remaining space is filled with an insulating isolation platform 93, and then the filled insulating isolation platform is used to make a side opening groove to form a recovery card slot 933.

Such approach is in order to prolong the service life of U-shaped memory alloy, guarantees the use precision of U-shaped memory alloy, in the present invention, through the return card slot that can clamp described second straight line segment, make U-shaped memory alloy in deformation and After cooling down and recovering, it can not be stretched and is in a natural standby state. In this way, the problem of poor deformation accuracy caused by long-term stretching of the U-shaped memory alloy can be prevented.

Except for the above two differences, other technical solutions of the second embodiment are similar or identical to those of the first embodiment.

The invention uses NiTiCu shape memory alloy as U-shaped memory alloy, solves the shortcoming of one-time use of the traditional fuse, can be used repeatedly, and has simple structure, safe operation and convenient use. In the present invention, by adjusting the deformation temperature and resistance of the shape memory alloy, it can also be used in a wide range of applications.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Because the various components of the present invention can be combined with each other under the condition of no conflict, any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall belong to the protection of the present invention. range.

Claims (7)

1. there are safeties for U-shaped memorial alloy, it is characterized in that, described in there is U-shaped memorial alloy safeties comprise:

U-shaped memorial alloy, described U-shaped memorial alloy comprises: the first straightway, second straightway, and the arc section be connected between described first straightway and described second straightway, described first straightway has the first end of the first straightway and the second end of the first straightway, described second straightway has the first end of the second straightway and the second end of the second straightway, described arc section is connected between the first end of described first straightway and the first end of described second straightway, second end of described first straightway and the second end of the second straightway form U-shaped opening, described U-shaped memorial alloy has the first memory area and the second memory area, and the U-shaped opening when described second memory area is greater than the U-shaped opening when described first memory area, described U-shaped memorial alloy is the bar-shaped of U-shaped,

Cut bank, described cut bank comprises: platform is isolated in metallic support platform and insulation adjacent with described metallic support platform in the horizontal direction;

Conduction draw-in groove, be arranged on the top of described metallic support platform, described conduction draw-in groove is the open slot with the first sliding surface, described second straightway can be connected to the bottom of described conduction draw-in groove, described first sliding surface is curved surface or inclined-plane, the bottom of described first sliding surface is connected with the bottom of described conduction draw-in groove, and the top of described first sliding surface is higher than the bottom of described conduction draw-in groove;

Second sliding surface, being arranged on the top of insulation isolation platform, described second sliding surface is curved surface or inclined-plane, and the bottom of the second sliding surface connects the top of described first sliding surface, and the top of the second sliding surface is higher than the bottom of the second sliding surface;

The vertical isolation surface of insulation, under the top being vertically connected to the second sliding surface, the height of the vertical isolation surface of described insulation is greater than the height of described second straightway;

At described first memory area, described second straightway is connected to the bottom of described conduction draw-in groove, and at described second memory area, described second straightway crosses described first sliding surface and the second sliding surface, is connected on the vertical isolation surface of described insulation.

2. there are the safeties of U-shaped memorial alloy as claimed in claim 1, it is characterized in that, described in there is U-shaped memorial alloy safeties also comprise:

Be arranged on the circuit substrate under described cut bank, described circuit substrate supports described cut bank, and what described metallic support platform and described insulation isolation platform walked abreast is arranged on described circuit substrate;

Be arranged on the fixed block on described circuit substrate, described first straightway is arranged on described fixed block;

Warning circuit, is arranged on described circuit substrate, and warning circuit has two links, the first end of warning circuit connects the first end of described first straightway, when described second memory area, the second end of warning circuit connects the second end of the second straightway, and warning circuit forms path;

Protected circuit, has two links, and the first end of protected circuit connects the first end of described first straightway; when described first memory area; second end of protected circuit connects the second end of the second straightway, and warning circuit forms open circuit, and protected circuit forms path.

3. there are the safeties of U-shaped memorial alloy as claimed in claim 2, it is characterized in that, described warning circuit comprises: be arranged on the power supply on circuit substrate, be arranged on circuit substrate and connect described power supply buzzer (5), be arranged on circuit substrate and be positioned at the contact rod between described U-shaped memorial alloy deformed area, the second end of described warning circuit is described contact rod.

4. have the safeties of U-shaped memorial alloy as claimed in claim 3, it is characterized in that, described warning circuit also comprises: to be arranged on circuit substrate and to connect the LED (6) of described power supply.

5. there are the safeties of U-shaped memorial alloy as claimed in claim 2, it is characterized in that, described in there is U-shaped memorial alloy safeties also comprise: auxiliary cool air hose of replying distortion, is set in outside described arc section.

6. there are the safeties of U-shaped memorial alloy as claimed in claim 5, it is characterized in that, the described safeties with U-shaped memorial alloy also comprise: the reply draw-in groove that can clamp described second straightway, be arranged on conduction draw-in groove under and be positioned on described circuit substrate, described reply draw-in groove is lateral openings groove, the opening of described reply draw-in groove extends on the vertical isolation surface of described insulation, and in the clamping position of described reply draw-in groove, described U-shaped memorial alloy is in described first memory area.

7. have the safeties of U-shaped memorial alloy as claimed in claim 3, it is characterized in that, described power supply is button cell.