Flaky alloy melt structure and fuse

Abstract

The invention discloses a sheet-shaped alloy melt structure and a fuse, the sheet-shaped alloy melt structure comprises a sheet-shaped alloy melt and a shape memory alloy sheet, the sheet-shaped alloy melt is provided with at least two wide sections along the length direction, a narrow section is formed between the two adjacent wide sections, and the cross section area of the narrow section is smaller than that of the wide section. The shape memory alloy sheet is connected to the surface of the wide section, the shape memory alloy sheet is in a plane shape in a low-temperature phase state, and the shape memory alloy sheet is attached to the surface of the wide section; the shape memory alloy sheet is bent in a high-temperature phase state; when the shape memory alloy piece is heated to the phase transition temperature, acting force acting on the wide section is generated, when the narrow section is heated to the melting point temperature, the narrow section is broken under the action of the acting force, the narrow section is broken to form a crack, the shape memory alloy piece is bent and drives the wide section to be bent and deformed, and the distance between the cracks is increased. The fuse can effectively restrain electric arcs, and is high in breaking capacity, high in thermal response sensitivity and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit protection, specifically to the technical field of fuses, and in particular to a sheet alloy melt structure and a fuse. Background Art

[0002] As a key component of circuit protection, the main function of the fuse is to quickly cut off the circuit when an overload current is detected to prevent damage to electrical equipment or fire. Specifically, the fuse is usually connected in series in the protected circuit. When the protected circuit is overloaded and after a period of time, the built-in fuse will melt due to the increase in temperature, thereby cutting off the circuit. The sheet alloy melt is a design widely used in fuses. Its characteristics are that there are multiple wide sections and narrow sections along the length direction. The narrow section has a small cross-sectional area and is easy to melt due to a sharp increase in temperature under overload conditions. However, when the narrow section of the melt melts, severe arcing often occurs at the crack. This is because the fuse only melts and shrinks the alloy to achieve melting. This method easily leads to an unsmooth disconnection process, which poses a major challenge to the safety and performance of the fuse. The traditional method is to fill quartz sand in the fuse to achieve the effect of arc suppression and arc extinguishing. However, due to the space limitation of the fuse housing, there is an upper limit to the filling amount of quartz sand, and its ability to absorb metal vapor and cool the arc is also limited. For fuses, a single arc extinguishing method often fails to achieve ideal results.

[0003] In order to solve the problem of arc formation in fuses under overload conditions, Chinese patent CN207690744 U proposes a solution, which is to apply a bimetallic strip composed of two metals or alloys with different thermal expansion coefficients to the design of the fuse. Bimetallic strips are mainly divided into two types: slow-acting type and sudden jump type. Specifically, the bimetallic strip can expand or contract with temperature changes, thereby producing a certain degree of bending, thereby triggering the fusing action. However, the application of bimetallic strips also faces multiple challenges: First, due to the different thermal expansion coefficients of the active and passive layers of the bimetallic strip, the fit between the active and passive layers of the bimetallic strip is not high, which is not conducive to heat conduction between each other, thereby reducing the response sensitivity to changes in the temperature of the alloy melt. Secondly, the bending degree of the bimetallic strip will change with the change of ambient temperature, that is, the bimetallic strip will "move" with the change of ambient temperature, and even if the fuse is working normally, the temperature of the alloy melt inside it is not constant, and it will fluctuate with the working state of the device and the change of ambient temperature. Therefore, the bimetallic strip will also bend upward or downward with the fluctuation of temperature, thereby continuously applying force to the alloy melt, and long-term force will cause the internal structure of the molten alloy to change, accelerating its aging process. In addition, CN105280451A also discloses connecting a tension state spring at both ends of the alloy melt to enhance the melt fracture speed. Although this improves the response speed, whether the fuse is in a normal working state or an overloaded state, the alloy melt is always subjected to the elastic tension applied by the elastomer, and long-term force is easy to cause the alloy to be distorted or even broken, and long-term force is also easy to cause the internal structure of the alloy to change, thereby accelerating aging and reducing the service life of the device. In summary, although the existing fuse design has ensured circuit safety to a large extent, there is still much room for improvement in improving arc extinguishing effect, optimizing thermal response sensitivity and extending service life.

[0004] Therefore, there is an urgent need for a sheet alloy melt structure and a fuse to solve the deficiencies of the prior art. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a sheet alloy melt structure and a fuse, which can effectively suppress arcs and have strong breaking capacity, high thermal response sensitivity and long service life.

[0006] To achieve the above objectives, the first aspect of the present invention provides a sheet alloy melt structure, comprising a sheet alloy melt and a shape memory alloy sheet, wherein the sheet alloy melt has at least two wide sections along its length direction, a narrow section is formed between two adjacent wide sections, the cross-sectional area of ​​the narrow section is smaller than the cross-sectional area of ​​the wide section, the shape memory alloy sheet is connected to the surface of the wide section, the phase change temperature of the shape memory alloy sheet is higher than the normal working temperature of the sheet alloy melt and lower than the melting point temperature of the sheet alloy melt, the shape memory alloy sheet is planar in a low-temperature phase state, and the shape memory alloy sheet is in contact with the surface of the wide section; the shape memory alloy sheet is curved in a high-temperature phase state; when the shape memory alloy sheet is heated to its phase change temperature, a force is generated on the wide section, and when the narrow section is heated to its melting point temperature, the narrow section breaks under the action of the force, and after the narrow section breaks to form a crack, the shape memory alloy sheet becomes curved and drives the wide section to bend and deform, thereby increasing the spacing of the cracks.

[0007] Compared with the prior art, the flaky alloy melt structure of the present invention has the following advantages: 1. The present invention improves the breaking capacity of the sheet alloy melt structure by fixing the shape memory alloy sheet on the wide section surface of the sheet alloy melt and utilizing the morphological change characteristics of the shape memory alloy sheet at different temperatures. Specifically, the shape memory alloy sheet remains flat and fits the wide section surface at low temperature; while at high temperature phase transition temperature, it changes to a bent state. When the fuse is overloaded, as the temperature of the sheet alloy melt rises, the shape memory alloy sheet that is closely attached to the wide section surface also heats up and begins to bend when it reaches its phase transition temperature. Since the narrow section has not yet broken, the bending of the shape memory alloy sheet is limited, and the limited bending will generate a force (pulling force or thrust, etc.) on the wide section. When the narrow section area reaches the melting temperature and begins to melt, the force generated by the shape memory alloy sheet on the width can accelerate the rapid breaking of the narrow section, thereby effectively inhibiting the formation of the arc. Once the narrow section breaks and forms a crack, the shape memory alloy sheet completely changes to a bent state and drives the wide section to bend and deform, thereby quickly widening the spacing of the crack, further achieving an arc extinguishing effect. Therefore, compared with the traditional method of relying solely on alloy melting and contraction to achieve disconnection, the present invention utilizes the force generated by the bending deformation of the shape memory alloy sheet to accelerate the rapid fracture of the narrow segment and quickly open the crack spacing at the moment of fracture, thereby effectively suppressing the generation of arcs and significantly improving the breaking capacity of the fuse.

[0008] 2. The shape memory alloy sheet used in the present invention is trained by the shape of the memory alloy. It is planar below the transition temperature and begins to bend above the transition temperature. This ensures that when the fuse is working normally, the shape memory alloy always maintains a planar shape without exerting force on the alloy melt, which significantly improves the service life of the fuse. 3. The shape memory alloy sheet of the present invention maintains a flat shape at low temperatures and fits tightly to the surface of the wide section, ensuring good heat conduction between the shape memory alloy sheet and the wide section. When the temperature changes, the shape memory alloy sheet can quickly sense the temperature change and immediately respond with a morphological change, which makes the sheet alloy melt structure of the present invention highly responsive to temperature changes.

[0009] Furthermore, the shape memory alloy sheet of the present invention is fixedly connected to the wide section surface by welding or bonding.

[0010] Furthermore, the shape memory alloy sheet of the present invention is detachably connected to the wide section surface by riveting or screwing.

[0011] Furthermore, the shape memory alloy sheet of the present invention is provided with a first mounting hole, and a second mounting hole corresponding to the first mounting hole is provided on the surface of the wide section. Furthermore, the material of the shape memory alloy sheet of the present invention is at least one of a nickel-titanium alloy, a copper alloy and an iron alloy.

[0012] Furthermore, the number of the shape memory alloy sheets of the present invention is two or more, and the multiple shape memory alloy sheets are located on the same side of the sheet-like alloy melt or alternately on both sides of the sheet-like alloy melt.

[0013] Furthermore, the material of the flake alloy melt of the present invention is at least one of copper, silver, tin-plated copper, nickel-plated copper, brass and zinc alloy.

[0014] Furthermore, the shape memory alloy sheet of the present invention is in a rectangular, square or elliptical plane shape in the low temperature phase state.

[0015] Correspondingly, the second aspect of the present invention provides a fuse, including a shell, a first electrode, and a second electrode. The above-mentioned flaky alloy melt structure is arranged in the shell, and an arc extinguishing medium is arranged between the flaky alloy melt structure and the shell; one end of the first electrode extends into the shell and is electrically connected to one end of the flaky alloy melt structure, and the other end of the first electrode extends from one side of the shell; one end of the second electrode extends into the shell and is electrically connected to the other end of the flaky alloy melt structure, and the other end of the second electrode extends from the other side of the shell.

[0016] Furthermore, the first electrode of the present invention is electrically connected to the sheet-like alloy melt structure by riveting or screwing; the second electrode is electrically connected to the sheet-like alloy melt structure by riveting or screwing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the fuse of the present invention.

[0018] Figure 2It is a three-dimensional structural schematic diagram of the flake alloy melt structure of the present invention.

[0019] Figure 3 for Figure 2 Front view of the lamellar alloy melt structure at normal operating temperature.

[0020] Figure 4 for Figure 2 Front view of the lamellar alloy melt structure when overloaded and the narrow segment is not broken.

[0021] Figure 5 for Figure 2 Front view of the lamellar alloy melt structure after overloading and narrow segment fracture.

[0022] Figure 6 It is another three-dimensional structural schematic diagram of the flake alloy melt structure of the present invention.

[0023] Figure 7 for Figure 6 Front view of the lamellar alloy melt structure at normal operating temperature.

[0024] Figure 8 for Figure 6 Front view of the lamellar alloy melt structure when overloaded and the narrow segment is not broken.

[0025] Fig. 9 for Figure 6 Front view of the lamellar alloy melt structure after overloading and narrow segment fracture.

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the flake alloy melt of the present invention.

[0027] Fig.11 It is another three-dimensional structural schematic diagram of the flake alloy melt of the present invention.

[0028] Fig.12 This is a front view of the sheet alloy melt structure of Comparative Example 1 after overloading and narrow segment fracture. DETAILED DESCRIPTION

[0029] In order to better illustrate the purpose, technical solution and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments and drawings. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0031] Please see Figure 1 The present invention provides a fuse 100, including a shell 11, a first electrode 12, and a second electrode 13. A flaky alloy melt structure 14 is provided in the shell 11, and an arc extinguishing medium 15 is provided between the flaky alloy melt structure 14 and the shell 11. The arc extinguishing medium 15 helps to quickly extinguish the possible arc, thereby improving the safety of the fuse 100. The arc extinguishing medium 15 can be quartz sand, and of course other arc extinguishing materials well known to those skilled in the art can also be selected; one end of the first electrode 12 extends into the shell 11 and is electrically connected to one end of the flaky alloy melt structure 14, and the other end of the first electrode 12 extends from one side of the shell 11; one end of the second electrode 13 extends into the shell 11 and is electrically connected to the other end of the flaky alloy melt structure 14, and the other end of the second electrode 13 extends from the other side of the shell 11. Specifically, the first electrode 12 of the present invention is electrically connected to the sheet-like alloy melt structure 14 by riveting or screwing, and correspondingly, the second electrode 13 is also electrically connected to the sheet-like alloy melt structure 14 by riveting or screwing. The electrode and the sheet-like alloy melt structure 14 are firmly connected by riveting or screwing, thereby ensuring the stability and reliability of current transmission.

[0032] Please refer to Figure 2~Figure 9The sheet alloy melt structure 14 of the present invention includes a sheet alloy melt 141 and a shape memory alloy sheet 142. The sheet alloy melt 141 has at least two wide sections 1411 along its length direction, and a narrow section 1412 is formed between the two adjacent wide sections 1411. The cross-sectional area of ​​the narrow section 1412 is smaller than the cross-sectional area of ​​the wide section 1411, so that when overloaded, the narrow section 1412 melts first to achieve the fuse function. For safety reasons, it is usually required that the wide section 1411 of the sheet alloy melt 141 is in a lower temperature range when the fuse 100 is working normally to avoid damage to the circuit and equipment due to overheating. For example, according to the UL standard, when the fuse 100 is working normally, the temperature rise of the wide section 1411 area relative to room temperature cannot exceed 75°C. In fact, by properly selecting the sheet alloy melt 141, optimizing the sheet alloy melt structure 14 and the structural design of the fuse 100, the actual fuse 100 can even control the temperature rise of the wide section 1411 area to below 50° C. When the fuse 100 is overloaded, the wide section 1411 area of ​​the sheet alloy melt 141 will experience a temperature rise process from a lower temperature to a higher temperature. The phase change temperature range of most shape memory alloys is -270°C ~ 500°C, which covers the temperature fluctuation range of the sheet alloy melt 141 under overload conditions. Therefore, the present invention connects the shape memory alloy sheet 142 to the surface of the wide section 1411, and the phase change temperature of the shape memory alloy sheet 142 is higher than the normal working temperature of the sheet alloy melt 141 and lower than the melting point temperature of the sheet alloy melt 141. The shape memory alloy sheet 142 is planar in the low-temperature phase state, and the shape memory alloy sheet 142 is in contact with the surface of the wide section 1411; the shape memory alloy sheet 142 is curved in the high-temperature phase state, that is, the morphological change characteristics of the shape memory alloy sheet 142 at different temperatures are used to improve the breaking ability of the sheet alloy melt structure 14.

[0033] Specifically, the shape memory alloy sheet 142 maintains a flat shape and fits the surface of the wide section 1411 at low temperatures; and at high temperature phase transition temperature, it changes to a bent state. When the fuse 100 is overloaded, as the temperature of the sheet alloy melt 141 rises, the shape memory alloy sheet 142 that is closely attached to the surface of the wide section 1411 also heats up and begins to bend when it reaches its phase transition temperature. Since the narrow section 1412 has not yet broken, the bending of the shape memory alloy sheet 142 is limited. The limited bending will generate a force F (such as a pulling force or a thrust) on the wide section 1411. When the narrow section 1412 area reaches the melting temperature and begins to melt, the force F generated by the shape memory alloy sheet 142 on the width can accelerate the rapid breaking of the narrow section 1412, thereby effectively suppressing the formation of an arc. Once the narrow section 1412 breaks and forms a crack, the shape memory alloy sheet 142 completely changes to a bent state and drives the wide section 1411 to bend and deform, thereby quickly widening the spacing of the crack, further achieving an arc extinguishing effect. Therefore, compared with the traditional method of relying solely on alloy melting and contraction to achieve disconnection, the present invention utilizes the force F generated by the bending deformation of the shape memory alloy sheet 142 to accelerate the rapid fracture of the narrow section 1412 and quickly open the crack spacing at the moment of fracture, thereby effectively suppressing the generation of arcs and significantly improving the breaking capacity of the fuse 100.

[0034] Specifically, the material of the sheet alloy melt 141 of the present invention is at least one of copper, silver, tin-plated copper, nickel-plated copper, brass and zinc alloy. These materials have good electrical conductivity and thermal conductivity. In addition, the shape memory alloy sheet 142 of the present invention maintains a planar shape under low temperature conditions and fits tightly to the surface of the wide section 1411, which ensures good heat conduction between the shape memory alloy sheet 142 and the wide section 1411. When the temperature changes, the shape memory alloy sheet 142 can quickly sense the temperature change and immediately respond with a morphological change, which makes the sheet alloy melt structure 14 of the present invention have a high response sensitivity to temperature changes.

[0035] The shape memory alloy sheet 142 can be fixed on the surface of the wide section 1411 of the sheet alloy melt 141 in a variety of ways. Fig.10 As shown, the wide section 1411 area of ​​the sheet alloy melt 141 is not provided with mounting holes. Specifically, the shape memory alloy sheet 142 can be firmly welded to the surface of the wide section 1411 by high temperature welding technology, or the shape memory alloy sheet 142 can be fixedly connected to the surface of the wide section 1411 by using high performance thermal conductive glue or other special adhesives. Of course, the shape memory alloy sheet 142 can also be detachably connected to the surface of the wide section 1411 by mechanical rivets, bolts or screws; specifically, as shown in FIG. Figure 6 and Fig.11As shown, the shape memory alloy sheet 142 is provided with a first mounting hole 1421, and the surface of the wide section 1411 is provided with a second mounting hole 14111 corresponding to the first mounting hole 1421. Rivets, bolts and other fasteners can be passed through the first mounting hole 1421 and the second mounting hole 14111 to firmly fix the shape memory alloy sheet 142 on the surface of the wide section 1411 to ensure that it will not shift or fall off during temperature changes; more specifically, the first mounting hole 1421 and the second mounting hole 14111 can be round holes or screw holes.

[0036] Specifically, the shape memory alloy sheet 142 used has a one-way or two-way shape memory effect. Through the shape training of the memory alloy, the shape memory alloy sheet 142 used in the present invention is in a planar shape below the transformation temperature, and starts to bend above the transformation temperature, so that when the fuse 100 works normally, the shape memory alloy always maintains a planar shape without generating a force F on the alloy melt, which significantly improves the service life of the fuse 100. More specifically, the shape memory alloy sheet 142 is in a rectangular, square or elliptical planar shape in the low temperature phase state, and deforms when the temperature reaches the transformation temperature, transforming from the low temperature phase (martensite phase) shape to the high temperature phase (austenite phase) shape, and the high temperature phase shape is bent or curled to a certain extent relative to the low temperature phase shape, and can be specifically designed and processed according to actual needs. In addition, the material of the shape memory alloy sheet 142 of the present invention is at least one of nickel-titanium alloy, copper alloy and iron alloy. The selection of specific material should be optimized according to the working characteristics of the fuse 100 to ensure that the morphological changes of the shape memory alloy sheet 142 at different temperatures can meet the performance requirements of the fuse 100.

[0037] The number and arrangement of the shape memory alloy sheets 142 can be designed in various ways according to actual needs. For example, two or more shape memory alloy sheets 142 can be used, and these shape memory alloy sheets 142 can be arranged as follows. Figure 2~Figure 5 As shown, the shape memory alloy sheets 142 alternately located on both sides of the sheet alloy melt 141 are alternately located. When the fuse 100 is overloaded, as the temperature rises, the shape memory alloy sheets 142 alternately located on both sides of the sheet alloy melt 141 will begin to bend after reaching their phase transition temperature, and the adjacent shape memory alloy sheets 142 respectively apply a force F to the wide section 1411, wherein the direction of the force F is as shown in FIG. Figure 4 As shown by the middle arrow, when the narrow section 1412 is broken, the adjacent wide sections 1411 are respectively as shown in FIG. Figure 5 In addition, it is also possible to Figure 6~Figure 9 As shown, all shape memory alloy sheets 142 are placed on the same side of the sheet alloy melt 141. In this case, once an overload occurs and the temperature rises, the adjacent shape memory alloy sheets 142 exert a force F on the wide section 1411, wherein the direction of the force F is as shown in FIG. Figure 8 As shown by the middle arrow, when the narrow section 1412 is broken, the adjacent wide section 1411 is Fig. 9 Obviously, the shape memory alloy sheets 142 alternately located on both sides of the sheet alloy melt 141 will make the gap spacing larger and the arc extinguishing effect better, so it is preferred to alternately locate multiple shape memory alloy sheets 142 on both sides of the sheet alloy melt 141.

[0038] The effects of the sheet alloy melt structure and the fuse of the present invention will be further described below in conjunction with specific examples 1-2 and comparative example 1.

[0039] Example 1 This embodiment provides a Figure 2 The sheet alloy melt structure shown includes a sheet alloy melt and two shape memory alloy sheets. The sheet alloy melt is made of brass H62, and the shape memory alloy sheets are made of titanium-nickel alloy (nickel content accounts for 55% and titanium content accounts for 45%). The sheet alloy melt has two wide sections along its length direction, and a narrow section is formed between the two adjacent wide sections. The shape memory alloy sheet is in a square plane shape in the low-temperature phase state. Four first mounting holes are provided on the shape memory alloy sheet, and the four first mounting holes are respectively located near the four corners of the shape memory alloy sheet. Second mounting holes corresponding to the first mounting holes are provided on the surface of the wide section. Rivets are used to pass through the first mounting holes and the second mounting holes to fix the shape memory alloy sheet on the surface of the wide section, and the two shape memory alloy sheets are respectively located on both sides of the sheet alloy melt.

[0040] The above-mentioned sheet alloy melt structure is arranged in a shell, and the two ends of the sheet alloy melt are connected to the first electrode and the second electrode respectively through rivets, and then quartz sand is poured into the shell to obtain the following Figure 1 The fuse shown. When the fuse works normally at room temperature of 25.2°C, the temperature of the wide section area is measured to be 50~60°C. When the fuse is overloaded, the narrow section area heats up sharply, and the wide section area is easier to dissipate heat because the cross-sectional area is larger than the narrow section area, the current density is smaller and the area is significantly larger than the narrow section area. In addition, it is connected to the first electrode and the second electrode, and the heat is easy to be extracted. Therefore, when the narrow section of the sheet alloy melt is melted, the temperature of the wide section area is measured to be in the range of 120~130°C. Since the shape memory alloy sheet used in this embodiment belongs to the nickel-titanium alloy, its austenite start temperature (As) is about 77°C and the austenite end temperature (Af) is about 113°C. Therefore, the temperature rise caused by the overload of the fuse is sufficient to induce the phase change of the memory alloy sheet inside it, thereby accelerating the melting of the melt and effectively suppressing the arc. When 1.5 times of the rated current was applied to the fuse, the arcing time was measured by the short-circuit test platform (DL10KV-100) and was found to be only 0.96ms.

[0041] Example 2 Embodiment 2 is substantially the same as Embodiment 1, and the only difference between the two is that the two shape memory alloy sheets are located on the same side of the sheet alloy melt.

[0042] The above-mentioned sheet alloy melt structure was used to make a fuse according to the method of Example 1. A current 1.5 times of the rated current was applied to the fuse, and the arcing time was measured to be 1.51 ms by a short-circuit test platform (DL10KV-100).

[0043] Comparative Example 1 Comparative Example 1 provides a Fig.12 The flake alloy melt structure 100 shown ， , which is basically the same as Example 1, the difference between the two is that: the two wide sections 1411 of Example 1 ， There is no fixed connection of the shape memory alloy sheet.

[0044] The above-mentioned sheet alloy melt structure 100 ， A fuse was prepared according to the method of Example 1, and 1.5 times the rated current was applied to the fuse. The sheet alloy melt structure 100 ， In overload and narrow section 1412 ， The main view after fracture is as follows Fig. 9 As shown, the arcing time measured by the short-circuit test platform (DL10KV-100) is 5.80ms.

[0045] In summary, compared with the traditional method of relying solely on alloy melting and contraction to achieve disconnection, the present invention utilizes the force generated by the bending deformation of the shape memory alloy sheet to accelerate the rapid fracture of the narrow segment and quickly open the crack spacing at the moment of fracture, thereby effectively suppressing the generation of arcs and significantly improving the breaking capacity of the fuse.

[0046] The above are only embodiments of the present invention, and they do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention, such as using a sheet alloy melt containing more than three wide sections and arranging more than three shape memory alloy sheets thereon, or changing the parent phase shape of the shape memory alloy sheet, should be included in the protection scope of the present invention.

Claims

1. A flake alloy melt structure, characterized in that: The invention comprises a sheet alloy melt and a shape memory alloy sheet, wherein the sheet alloy melt has at least two wide sections along its length direction, a narrow section is formed between two adjacent wide sections, the cross-sectional area of ​​the narrow section is smaller than the cross-sectional area of ​​the wide section, the shape memory alloy sheet is connected to the surface of the wide section, the phase change temperature of the shape memory alloy sheet is higher than the normal working temperature of the sheet alloy melt and lower than the melting point temperature of the sheet alloy melt, the shape memory alloy sheet is planar in a low temperature phase state, and the shape memory alloy sheet is in contact with the surface of the wide section; the shape memory alloy sheet is curved in a high temperature phase state; When the shape memory alloy sheet is heated to its phase change temperature, a force is generated on the wide section. When the narrow section is heated to its melting point, the narrow section breaks under the action of the force. After the narrow section breaks to form a crack, the shape memory alloy sheet becomes bent and drives the wide section to bend and deform, thereby increasing the spacing of the cracks.

2. The flaky alloy melt structure according to claim 1, characterized in that: The shape memory alloy sheet is fixedly connected to the wide section surface by welding or bonding.

3. The sheet alloy melt structure according to claim 1, characterized in that: The shape memory alloy sheet is detachably connected to the wide section surface by riveting or screwing.

4. The flaky alloy melt structure according to claim 3, characterized in that: The shape memory alloy sheet is provided with a first mounting hole, and the wide section surface is provided with a second mounting hole corresponding to the first mounting hole.

5. The sheet alloy melt structure according to claim 1, characterized in that: The shape memory alloy sheet is made of at least one of a nickel-titanium alloy, a copper alloy and an iron alloy.

6. The sheet alloy melt structure according to claim 1, characterized in that: The number of the shape memory alloy sheets is two or more, and the plurality of shape memory alloy sheets are located on the same side of the sheet-shaped alloy melt or alternately on both sides of the sheet-shaped alloy melt.

7. The sheet alloy melt structure according to claim 1, characterized in that: The material of the sheet alloy melt is at least one of copper, silver, tin-plated copper, nickel-plated copper, brass and zinc alloy.

8. The sheet alloy melt structure according to claim 1, characterized in that: The shape memory alloy sheet is in a rectangular, square or elliptical plane shape in a low temperature phase state.

9. A fuse, characterized in that: It comprises a shell, a first electrode and a second electrode, wherein the shell is provided with a sheet alloy melt structure as described in any one of claims 1 to 8, and an arc extinguishing medium is provided between the sheet alloy melt structure and the shell; one end of the first electrode extends into the shell and is electrically connected to one end of the sheet alloy melt structure, and the other end of the first electrode extends from one side of the shell; one end of the second electrode extends into the shell and is electrically connected to the other end of the sheet alloy melt structure, and the other end of the second electrode extends from the other side of the shell.

10. The fuse according to claim 9, characterized in that The first electrode is electrically connected to the sheet-shaped alloy melt structure by riveting or screwing; the second electrode is electrically connected to the sheet-shaped alloy melt structure by riveting or screwing.

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