Fuse and electric equipment

Abstract

The utility model relates to a fuse and electric equipment, the fuse comprises a housing, a terminal assembly and a melt, and the housing comprises a cavity; the terminal assembly comprises a first terminal assembly and a second terminal assembly which are arranged in the shell and extend towards the interior of the cavity; the fuse body comprises a first fuse body and a second fuse body, the first fuse body is arranged in the cavity and electrically connected to the first terminal assembly and the second terminal assembly, the second fuse body is arranged in the cavity and electrically connected to the first terminal assembly and the second terminal assembly, the length of the second fuse body is larger than that of the first fuse body, and fractures in the second fuse body are larger than those in the first fuse body. The length of the second fuse body is larger than that of the first fuse body, so that more fractures can be formed in the second fuse body, the energy of an electric arc can be dispersed when the second fuse body is fused, partial pressure on each fracture is reduced, it is guaranteed that an arc extinguishing medium in the fuse can fully absorb the energy of the electric arc, the arcing time is shortened, and the service life of the fuse is prolonged. And the voltage endurance capability and the arc extinguishing effect are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fuses, and in particular, to a fuse and an electrical device. Background Art

[0002] A fuse is a circuit protector that can melt the fuse inside the fuse housing when the current exceeds the specified value, thereby disconnecting the circuit and protecting the circuit and electrical appliances. Currently, the withstand voltage of fuses is poor and they cannot fully absorb the arc generated when the fuse is disconnected, causing the arc to damage the fuse and electrical components. Utility Model Content

[0003] The purpose of the present disclosure is to provide a fuse and an electrical device to improve the withstand voltage capability and shorten the arc burning time of the electric arc, thereby at least partially solving the above technical problems.

[0004] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a fuse, comprising: a shell including a cavity; a terminal assembly including a first terminal assembly and a second terminal assembly arranged in the shell and extending toward the inside of the cavity; and a fuse including a first fuse arranged in the cavity and electrically connected to the first terminal assembly and the second terminal assembly, and a second fuse arranged in the cavity and electrically connected to the first terminal assembly and the second terminal assembly; the length of the second fuse is greater than that of the first fuse; and there are more fractures on the second fuse than on the first fuse.

[0005] Optionally, the second melt has at least one bending portion, so that the second melt can be bent and extended in the cavity.

[0006] Optionally, a guide structure is provided in the cavity, and the guide structure is provided in a one-to-one correspondence with the bending portion; the second melt is wound around the guide structure through the bending portion.

[0007] Optionally, the guide structure is configured as a guide column group extending along a height direction of the shell, so as to support the second melt in a width direction of the second melt.

[0008] Optionally, the second melt is generally S-shaped.

[0009] Optionally, a first partition and a second partition are arranged in the cavity, the first melt is arranged outside the first partition and the second partition, and the second melt is arranged between the first partition and the second partition; the guide column group is located between the first partition and the second partition.

[0010] Optionally, the first melt and the second melt are arranged at intervals along the height direction of the shell, and projections of at least part of the first melt and the second melt on the bottom surface of the shell overlap.

[0011] Optionally, the guide column groups are configured in plurality, and the plurality of guide column groups are respectively arranged at intervals in the length and width directions of the shell, and the second melt is sequentially wound around the plurality of guide column groups along the extension direction to form a plurality of the bending portions.

[0012] Optionally, the first terminal assembly includes a first terminal and a first copper bar extending toward the interior of the cavity; the second terminal assembly includes a second terminal and a second copper bar extending toward the interior of the cavity; both ends of the first fuse are respectively connected to the first terminal and the second terminal; one end of the second fuse is connected to the first copper bar along the extension direction of the first copper bar, and the other end is connected to the second copper bar along the extension direction of the second copper bar.

[0013] Optionally, the first partition plate and / or the second partition plate are provided with a sand filling hole for connecting the first partition plate and the second partition plate with the outside of the shell, and a plug cooperating with the sand filling hole.

[0014] Optionally, the first melt is configured as a silver melt, and the second melt is configured as a copper melt or an aluminum melt.

[0015] Optionally, the fuse further comprises a plurality of heat sinks arranged at intervals on the outer side wall of the shell.

[0016] A second aspect of the present disclosure provides an electrical device including the above-mentioned fuse.

[0017] Through the above technical scheme, the length of the second fuse disclosed in the present invention is greater than that of the first fuse, so that more fractures can be set on the second fuse, so that the second fuse can disperse the energy of the arc when it is melted, reduce the voltage drop on each fracture, and ensure that the arc extinguishing medium in the fuse can fully absorb the energy of the arc, compress the arc burning time, and improve the voltage resistance and arc extinguishing effect.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 is a schematic diagram of the internal structure of a fuse provided in an embodiment of the present disclosure;

[0021] Figure 2 is an isometric view of a second fuse of a fuse provided by an embodiment of the present disclosure;

[0022] Figure 3 is a top view of a second fuse of a fuse provided by an embodiment of the present disclosure;

[0023] Figure 4 It is a schematic diagram of the external structure of the fuse provided in an embodiment of the present disclosure.

[0024] Description of Reference Numerals

[0025] 1-shell; 2-cavity; 4-first terminal assembly; 41-first terminal; 42-first copper busbar; 5-second terminal assembly; 51-second terminal; 52-second copper busbar; 6-melt; 7-first melt; 8-second melt; 81-bending portion; 9-guide structure; 91-guide column group; 1001-first partition; 1002-second partition; 11-fracture; 12-sand filling hole; 13-plug; 14-heat sink; 15-via. DETAILED DESCRIPTION

[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0027] In the present disclosure, unless otherwise stated, directional words such as "inside" and "outside" refer to the "inside" and "outside" relative to the contour of the corresponding component itself; the length direction, width direction and height direction of the shell are respectively Figure 1 In the embodiment of the present invention, the Y direction, X direction and Z direction shown in the figure correspond to each other. In addition, the terms "first", "second" and the like used in the present invention are used to distinguish one element from another element and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present invention and should not be construed as limitations on the present invention.

[0028] In the related technology, the fuse may include a current-resistant fuse with a small resistance and a single-row fracture and a pressure-resistant fuse with a large resistance and multiple rows of fractures. Under normal operating conditions, most of the current in the circuit will pass through the current-resistant fuse, and almost no current will pass through the pressure-resistant fuse. Therefore, the current-resistant fuse mainly plays the role of current conduction, and the pressure-resistant fuse mainly plays the role of voltage division and arc extinguishing. When a short-circuit current occurs, the current-resistant fuse will quickly blow. At the moment the current-resistant fuse blows, the arc of the current-resistant fuse is extinguished, and the voltage and large current will be quickly loaded on the pressure-resistant fuse, causing the pressure-resistant fuse to blow and extinguish the arc.

[0029] Currently, the lengths of the pressure-resistant fuse and the current-resistant fuse in the fuse are generally the same, which limits the number of multi-row fractures on the pressure-resistant fuse, resulting in poor pressure-resistant capacity and arc-extinguishing capacity of the pressure-resistant fuse.

[0030] Based on this, the fuse in the exemplary embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0031] refer to Figures 1 to 4 As shown, in the first aspect of the present disclosure, a fuse is provided, including a shell 1, a terminal assembly and a fuse 6, wherein the shell 1 includes a cavity 2; the terminal assembly includes a first terminal assembly 4 and a second terminal assembly 5 arranged in the shell 1 and extending toward the inside of the cavity 2; the fuse 6 includes a first fuse 7 arranged in the cavity 2 and electrically connected to the first terminal assembly 4 and the second terminal assembly 5, and a second fuse 8 arranged in the cavity 2 and electrically connected to the first terminal assembly 4 and the second terminal assembly 5, the length of the second fuse 8 is greater than that of the first fuse 7; and there are more fractures 11 on the second fuse 8 than on the first fuse. That is, the first melt 7 is a flow-resistant melt, the second melt 8 is a pressure-resistant melt, and the length of the second melt 8 is greater than that of the first melt 7. Compared with the pressure-resistant melt in the related art, the present invention can set more fractures 11 on the second melt 8, so that the second melt 8 can disperse the energy of the arc when it is melted, reduce the partial pressure on each fracture 11, and the field strength is relatively small, thereby ensuring that the arc extinguishing medium in the fuse can fully absorb the energy of the arc, compress the arc burning time, and improve the pressure resistance and arc extinguishing effect.

[0032] In some embodiments of the present disclosure, Figure 2 and Figure 3 As shown, the second melt 8 has at least one bending portion 81, so that the second melt 8 can bend and extend in the cavity 2. The bending portion 81 can change the extension angle of the second melt 8, thereby increasing the length of the second melt 8 as much as possible within a limited space, so as to facilitate setting more fractures 11 on the second melt 8.

[0033] In some embodiments, Figures 1 to 3 As shown, a guide structure 9 is provided in the cavity 2, and the guide structure 9 is provided in one-to-one correspondence with the bending portion 81; the second melt 8 is wound around the guide structure 9 through the bending portion 81. The guide structure 9 can arrange the second melt 8 in the cavity 2 in an orderly manner, avoiding the second melt 8 from overheating or short circuiting due to contact between different positions of the second melt 8, and at the same time increasing the length of the second melt 8, the safety of the fuse is also ensured.

[0034] Specifically, Figure 2 and Figure 3As shown, the guide structure 9 can be constructed as a guide column group 91 extending along the height direction of the shell 1 to support the second melt 8 in the width direction of the second melt 8. On the one hand, this can reduce the space occupied by the guide structure 9 in the length or width direction of the shell 1, thereby making the structure of the shell 1 more reasonable. On the other hand, it can also ensure the stability of the second melt 8 after being wound around the guide column group 91.

[0035] In some embodiments of the present disclosure, Figure 3 As shown, the second melt 8 is generally S-shaped. This ensures that the second melt 8 can be arranged in an orderly manner and extend to the maximum extent using the space inside the cavity 2 to maximize its length.

[0036] Since the second fuse 8 has the function of extinguishing the arc, in order to prevent the energy generated by the arc from impacting the fuse or other equipment, such as Figure 1 As shown, a first partition 1001 and a second partition 1002 may be arranged in the cavity 2, the first melt 7 is arranged outside the first partition 1001 and the second partition 1002, the second melt 8 is arranged between the first partition 1001 and the second partition 1002, and the guide column group 91 is located between the first partition 1001 and the second partition 1002. In this way, the first partition 1001 and the second partition 1002 can isolate the second melt 8 separately, which can prevent the energy generated by the arc from impacting the outside world on the one hand, and on the other hand, it is also convenient to fill the arc extinguishing medium between the first partition 1001 and the second partition 1002.

[0037] In some embodiments of the present disclosure, the first melt 7 and the second melt 8 are spaced apart in the height direction of the shell 1, and at least part of the projections of the first melt 7 and the second melt 8 on the bottom surface of the shell 1 overlap. In this way, the space occupied by the first melt 7 and the second melt 8 in other directions can be reduced, thereby reasonably utilizing the space in the shell 1 and reducing the length or width of the shell 1.

[0038] In some embodiments, a plurality of guide post groups 91 may be provided, and the plurality of guide post groups 91 are spaced apart in the length and width directions of the housing 1, and the second melt 8 is sequentially wound around the plurality of guide post groups 91 along the extension direction to form a plurality of bending portions 81. In this way, the second melt 8 can fully utilize the space in the housing 1, ensuring that the length of the second melt 8 can be greater than the length of the first melt 7, so that more fractures 11 can be provided on the second melt 8 to improve the pressure resistance and arc extinguishing effect. In addition, the guide post group 91 can be provided with one or more guide posts according to the bending angle of the second melt 8 and the size of the cavity 2. For example, the guide post group 91 can be provided with a guide post group 91 having one guide post at both ends of the second melt to adjust the extension direction of the end of the second melt 8 by a small angle, and the guide post group 91 located between the second melts 8 can be provided with two or more guide posts. The multiple guide posts can extend linearly in the same direction to increase the curvature of the bending portion 81 as much as possible, so that the second melt 8 can maintain a suitable distance from the previous area of ​​the second melt 8 after turning through the guide post group 91 to avoid contact between different positions of the second melt 8. In addition, since the outer surface of the guide post has a curvature, the bending portion 81 can be more conveniently and quickly arranged on the guide post.

[0039] In some embodiments, Figure 1 As shown, the first terminal assembly 4 includes a first terminal 41 and a first copper bar 42 extending toward the inside of the cavity 2; the second terminal assembly 5 includes a second terminal 51 and a second copper bar 52 extending toward the inside of the cavity 2, the first copper bar 42 and the second copper bar 52 can pass through the first partition 1001 to be connected to the second partition 1002, and the two ends of the first melt 7 are respectively connected to the first terminal 41 and the second terminal 51; one end of the second melt 8 is connected to the first copper bar 42 along the extension direction of the first copper bar 42, and the other end is connected to the second copper bar 52 along the extension direction of the second copper bar 52. In this way, the ends of the second melt 8 can be connected to the first copper bar 42 and the second copper bar 52 through a plurality of fasteners such as bolts or screws, thereby increasing the connection area between the second melt 8 and the first copper bar 42 and the second copper bar 52, and ensuring the stability of the second melt 8 after connection.

[0040] In order to facilitate the arc extinguishing of the fuse, Figure 2 and Figure 3As shown, the housing 1 is provided with a sand filling hole 12 and a plug 13 matched with the sand filling hole 12, and the first partition 1001 and / or the second partition 1002 are provided with a through hole 15 for connecting the sand filling hole 12. The plug 13 is opened, and the arc extinguishing medium, such as quartz sand, is filled between the first partition 1001 and the second partition 1002 through the sand filling hole 12 and the through hole 15, and then the plug 13 is matched with the sand filling hole 12 to ensure the sealing between the first partition 1001 and the second partition 1002, so that when the second fuse 8 is melted, the arc extinguishing medium can fully contact the arc, thereby achieving the arc extinguishing effect.

[0041] In some embodiments of the present disclosure, the first melt 7 may be configured as a silver melt, and the second melt 8 may be configured as a copper melt or an aluminum melt, to ensure that the melts can be quickly melted.

[0042] In some embodiments, Figure 4 As shown, the fuse also includes a plurality of heat sinks 14 arranged at intervals on the outer side wall of the housing 1. The heat sinks 14 can dissipate the heat inside the fuse to ensure that the fuse can work normally.

[0043] In addition, it should be noted that the housing 1 , the first partition plate 1001 , the second partition plate 1002 and the guide column group 91 of the present disclosure are all made of insulating materials.

[0044] The second aspect of the present disclosure provides an electrical device, comprising the above-mentioned fuse. The electrical device has all the beneficial effects of the fuse, which will not be described in detail in the present disclosure.

[0045] In summary, the present disclosure exemplarily illustrates the use process of a fuse.

[0046] When the fuse is in normal use, the current in the circuit will pass through the first fuse 7, and almost no current will pass through the second fuse 8. After a short-circuit current occurs, the first fuse 7 will quickly blow, and the voltage and current at this time will quickly load on the second fuse 8 and cause the second fuse 8 to blow. Since the length of the second fuse 8 is greater than that of the first fuse, more fractures 11 can be set on it, so that the second fuse 8 can disperse the energy of the arc when it blows, reduce the voltage drop on each fracture 11, and ensure that the arc extinguishing medium in the fuse can fully absorb the energy of the arc, shorten the arc burning time, and improve the withstand voltage and arc extinguishing effect.

[0047] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0049] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A fuse, characterized in that: include: a housing, including a cavity; The terminal assembly includes a first terminal assembly and a second terminal assembly disposed in the housing and extending toward the interior of the cavity; and A melt, including a first melt disposed in the cavity and electrically connected to the first terminal assembly and the second terminal assembly, and a second melt disposed in the cavity and electrically connected to the first terminal assembly and the second terminal assembly; The second melt is longer than the first melt, and the second melt has more fractures than the first melt.

2. The fuse according to claim 1, characterized in that: The second melt has at least one bending portion, so that the second melt can be bent and extended in the cavity.

3. The fuse according to claim 2, characterized in that: A guide structure is provided in the cavity, and the guide structure is provided in a one-to-one correspondence with the bending portion; The second melt is disposed around the guide structure through the bending portion.

4. The fuse according to claim 3, characterized in that: The guide structure is configured as a guide column group extending along a height direction of the housing to support the second melt in a width direction of the second melt.

5. The fuse according to claim 2, characterized in that: The second melt is generally S-shaped.

6. The fuse according to claim 4, characterized in that: A first partition and a second partition are arranged in the cavity, the first melt is arranged outside the first partition and the second partition, and the second melt is arranged between the first partition and the second partition; The guide column group is located between the first partition plate and the second partition plate.

7. The fuse according to claim 6, characterized in that: The first melt and the second melt are arranged at intervals along the height direction of the shell, and projections of at least a portion of the first melt and the second melt on the bottom surface of the shell overlap.

8. The fuse according to claim 6, characterized in that: There are a plurality of guide post groups, which are spaced apart in the length and width directions of the shell, respectively. The second melt is sequentially wound around the plurality of guide post groups along the extension direction to form a plurality of bending portions.

9. The fuse according to claim 6, characterized in that: The first terminal assembly includes a first terminal and a first copper bar extending toward the interior of the cavity; The second terminal assembly includes a second terminal and a second copper bar extending toward the interior of the cavity; Two ends of the first fuse are connected to the first terminal and the second terminal respectively; One end of the second melt is connected to the first copper bar along the extension direction of the first copper bar, and the other end of the second melt is connected to the second copper bar along the extension direction of the second copper bar.

10. The fuse according to claim 6, characterized in that: The shell is provided with a sand filling hole and a plug matched with the sand filling hole, and the first partition plate and / or the second partition plate are provided with a through hole for connecting with the sand filling hole.

11. The fuse according to any one of claims 1 to 10, characterized in that: The first melt is configured as a silver melt, and the second melt is configured as a copper melt or an aluminum melt.

12. The fuse according to claim 11, characterized in that The fuse further includes a plurality of heat sinks arranged at intervals on the outer side wall of the housing.

13. An electrical equipment, characterized in that: The invention comprises the fuse according to any one of claims 1 to 12.

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