A fuse

Abstract

This utility model discloses a fuse, including a fuse tube and at least one fusible element, the fusible element being disposed inside the fuse tube. The fuse tube is closed at both ends, with at least one end sealed via a closed conductive structure. The fuse tube is filled with an arc-extinguishing medium. The closed conductive structure includes a conductive connecting piece, an arc-resistant gasket, and a cover plate. The conductive connecting piece covers the opening at one end of the fuse tube and has a terminal electrically connected to it. The conductive connecting piece has a first through hole through which the fusible element passes and is welded to the conductive connecting piece. The arc-resistant gasket is located on the side of the conductive connecting piece away from the fuse tube and covers the first through hole. The arc-resistant gasket has a second through hole communicating with the first through hole. The cover plate is located on the side of the arc-resistant gasket away from the fuse tube and closes the second through hole. The cover plate is fixedly connected to the fuse tube.

Description

Technical Field

[0001] This utility model belongs to the field of fuse technology, and in particular relates to a fuse. Background Technology

[0002] A fuse is a circuit protection device based on the principle of current thermal effect. When the current exceeds a specified value, the fuse element melts due to the heat generated by the fuse element itself to cut off the circuit, thereby protecting electrical equipment and lines from overload or short circuit damage.

[0003] In some existing fuses, because the size of the terminal block is the same as (or approximately the same as) the size of the fuse tube, the terminal block will close the opening at the end of the fuse tube when it covers the end of the fuse tube. This prevents the fusible element inside the fuse tube from being directly welded to the terminal block, requiring the use of auxiliary terminals. Specifically, the size of the auxiliary terminal block is smaller than the internal space of the fuse tube, allowing it to enter (or pass through) the internal space of the fuse tube. During assembly, both ends of the fusible element are welded to two auxiliary terminals respectively. Then, the welded components (the fusible element and its two auxiliary terminals) are placed inside the fuse tube. The two terminal blocks are respectively covered and connected to both ends of the fuse tube, and are fixedly connected to the auxiliary terminals at both ends of the fusible element inside the fuse tube using screws or other means, thereby achieving electrical connection between the fusible element and the terminal block.

[0004] However, with this type of fuse, when the auxiliary terminal and the wiring terminal are attached and fixed together by screws or other means, the different torques of the screws and the different conditions of the contact surfaces (such as oil contamination) can lead to a particularly high contact resistance between the auxiliary terminal and the wiring terminal, which may even exceed the resistance of the fuse itself. Utility Model Content

[0005] To address the above problems, this utility model provides a fuse, comprising a fuse tube and at least one fusible element, wherein the fusible element is disposed within the fuse tube; the fuse tube is closed at both ends, with at least one end being closed via a closed conductive structure, and the fuse tube is filled with an arc-extinguishing medium; the closed conductive structure includes:

[0006] A conductive connecting piece covers one end opening of the molten tube, and a terminal is electrically connected to the conductive connecting piece; the conductive connecting piece is provided with a first through hole, through which the molten material passes and is welded to the conductive connecting piece;

[0007] An anti-arc gasket is provided on the side of the conductive connecting piece away from the fusion tube and covers the first through hole. The anti-arc gasket is provided with a second through hole that communicates with the first through hole.

[0008] A cover plate is provided on the side of the anti-arc gasket away from the fusion tube, and the cover plate closes the second through hole. The cover plate is fixedly connected to the fusion tube.

[0009] Optionally, the anti-arc gasket is a barley paper gasket.

[0010] Optionally, the conductive connecting piece has a first surface and a second surface disposed opposite to each other, with the first surface of the conductive connecting piece facing the interior of the fusible tube;

[0011] The melt passes through the first through hole and is then welded to the second surface of the conductive connecting piece.

[0012] Optionally, the melt adheres to the sidewall of the first through hole when it passes through the first through hole, and the melt is bent after passing through the first through hole to adhere to the surface of the conductive connecting piece.

[0013] Optionally, the portion of the inner wall of the first through hole that is in contact with the melt is a plane.

[0014] Optionally, the portion of the melt that is in contact with the second surface of the conductive connecting piece has its surface facing away from the conductive connecting piece in contact with the arc-proof gasket.

[0015] Optionally, the molten tube contains a plurality of molten materials, the conductive connecting piece has a plurality of corresponding first through holes, and the anti-arc pad has a plurality of corresponding second through holes; the molten materials, the first through holes, and the second through holes correspond one-to-one.

[0016] Optionally, the conductive connecting piece has a mounting groove on the side surface opposite to the fused tube, and the first through hole is located on the bottom surface of the mounting groove.

[0017] The anti-arc gasket is installed in the mounting groove; the anti-arc gasket is configured to be pressed tightly in the mounting groove by the cover plate, and the side surface of the anti-arc gasket facing away from the bottom surface of the mounting groove is pressed tightly against the cover plate.

[0018] Optionally, in the axial direction of the fuse, the conductive connecting piece is disposed between the fuse tube and the cover plate, and the terminal is connected to the side of the conductive connecting piece.

[0019] Optionally, the conductive connecting piece is welded to the terminal or integrally formed.

[0020] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0021] The fuse provided by this invention allows the fusible element to pass through the first through hole on the conductive connecting piece and be welded to it. Therefore, the fuse of this invention allows the fusible element and the conductive connecting piece to be welded after the conductive connecting piece covers the end of the fusible tube, thus achieving electrical connection between the fusible element and the conductive connecting piece without the need for auxiliary terminals and screws. Therefore, the fuse of this invention eliminates the contact resistance between the auxiliary terminal and the wiring terminal, solving the problem of excessive contact resistance in existing fuses. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] Figure 1 This is a schematic diagram of a fuse according to Example 1;

[0024] Figure 2 This is a schematic diagram of a fuse after removing the cover plate in Example 1;

[0025] Figure 3 This is a schematic diagram of a fuse in Example 1 after removing the cover plate and the arc-proof gasket;

[0026] Figure 4 This is a cross-sectional schematic diagram of a fuse according to Example 1.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1: Fusion tube; 2: Fusion material; 3: Conductive connecting piece; 31: First through hole; 32: Mounting groove; 4: Terminal; 5: Cover plate; 6: Anti-arc gasket; 61: Second through hole; 7: Screw. Detailed Implementation

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0030] To keep the drawings concise, only the parts related to this utility model are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0031] In this document, the term "one" not only means "only one" but can also mean "more than one". The terms "first", "second", "third", etc., are used only for descriptive distinction and should not be interpreted as indicating or implying relative importance. The terms "perpendicular" and "parallel" do not indicate absolute perpendicularity or parallelism; they can be approximately perpendicular or approximately parallel.

[0032] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] See Figures 1 to 4 This embodiment provides a fuse, including a fuse tube 1 and four fuse elements 2. The fuse elements 2 are disposed inside the fuse tube 1. Both ends of the fuse tube 1 are sealed by a closed conductive structure. The fuse tube 1 is filled with an arc-extinguishing medium. Of course, in other embodiments, the fuse may include one or more fuse elements 2, or the fuse tube 1 may be sealed at only one end by a closed conductive structure. This utility model does not limit these possibilities.

[0034] The closed conductive structure includes a conductive connecting piece 3, an arc-proof gasket 6, and a cover plate 5. The conductive connecting piece 3 covers and connects to one end opening of the fusion tube 1. The conductive connecting piece 3 has four first through holes 31, each corresponding to one of the four molten elements 2. One end of the molten element 2 passes through the corresponding first through hole 31 and is welded to the conductive connecting piece 3. Both ends of the fusion tube 1 are sealed by the closed conductive structure. Therefore, both ends of the molten elements 2 inside the fusion tube 1 pass through the corresponding first through holes 31 on two conductive connecting pieces 3 and are welded to the two conductive connecting pieces 3 respectively.

[0035] The conductive connecting piece 3 has a first surface and a second surface arranged opposite to each other, with the first surface of the conductive connecting piece 3 facing the inside of the molten tube 1; the molten material 2 passes through the first through hole 31 and is welded to the second surface of the conductive connecting piece 3. Preferably, the molten material 2 is bent after passing through the first through hole 31 to fit against the surface (i.e., the second surface) of the conductive connecting piece 3, and the molten material 2 fits against the side wall of the first through hole 31 when passing through the first through hole 31, and the portion of the inner wall of the first through hole 31 that fits against the molten material 2 is planar.

[0036] An arc-proof gasket 6 is disposed on the side of the conductive connecting piece 3 facing away from the molten tube 1 and covers all the first through holes 31. The arc-proof gasket 6 has a second through hole 61 communicating with the first through holes 31. Specifically, the surface of the conductive connecting piece 3 facing away from the molten tube 1 is provided with a mounting groove 32, and all the first through holes 31 are located on the bottom surface of the mounting groove 32; the arc-proof gasket 6 is installed in the mounting groove 32. The portion of the molten material 2 that is in contact with the second surface of the conductive connecting piece 3 has its surface facing away from the conductive connecting piece 3 in contact with the arc-proof gasket 6. Preferably, the arc-proof gasket 6 can be a barley paper gasket made of barley paper.

[0037] The cover plate 5 is located on the side of the anti-arc gasket 6 facing away from the molten tube 1, and the cover plate 5 closes the second through hole 61. The cover plate 5 is fixedly connected to the molten tube 1. The cover plate 5 presses the anti-arc gasket 6 tightly into the mounting groove 32, and the surface of the anti-arc gasket 6 facing away from the bottom of the mounting groove 32 is pressed tightly against the cover plate 5. In this way, the closed conductive structure can seal one end of the molten tube 1: the opening at one end of the molten tube 1 is sealed by the conductive connecting piece 3, the opening on the conductive connecting piece 3—the first through hole 31—is sealed by the anti-arc gasket 6, and the opening on the anti-arc gasket 6—the second through hole 61—is sealed by the cover plate 5.

[0038] The fusible tube 1 contains four molten elements 2, the conductive connecting piece 3 has four corresponding first through holes 31, and the anti-arc pad 6 has four corresponding second through holes 61. The molten elements 2, the first through holes 31, and the second through holes 61 are in a one-to-one correspondence. Of course, in other embodiments, the molten elements 2, the first through holes 31, and the second through holes 61 may not be in a one-to-one correspondence. For example, multiple molten elements 2 may pass through the same first through hole 31, multiple second through holes 61 may be connected to the same first through hole 31, or there may be a first through hole 31 but no second through hole 61 connected to it, etc. This utility model does not limit this.

[0039] The cover plate 5 is fixedly connected to the fusion tube 1 by screws 7. Specifically, a threaded blind hole is provided on the end face of one end of the fusion tube 1, and a corresponding threaded through hole is provided on the outer side of the mounting groove 32 of the conductive connecting piece 3. The cover plate 5 is also provided with a corresponding threaded through hole. The conductive connecting piece 3 covers one end of the fusion tube 1, and the cover plate 5 covers the conductive connecting piece 3. The screw 7 passes through the threaded through hole on the cover plate 5 and the threaded through hole on the conductive connecting piece 3 and connects with the threaded blind hole on the fusion tube 1, thereby fixing the cover plate 5 to the fusion tube 1. The conductive connecting piece 3 is pressed tightly onto the fusion tube 1 by the cover plate 5, and the anti-arc gasket 6 is pressed tightly into the mounting groove 32 on the conductive connecting piece 3 by the cover plate 5.

[0040] The conductive connecting piece 3 is electrically connected to a terminal 4, which is used to electrically connect to an external component. This external component is generally a wire, so the terminal 4 is generally called a terminal block. Of course, the external component can also be other conductive components besides the wire, such as a conductive metal sheet.

[0041] The conductive connecting piece 3 and the terminal 4 can be welded together or integrally formed. Preferably, when the conductive connecting piece 3 and the terminal 4 are made of the same material, they are integrally formed to achieve electrical connection; when the conductive connecting piece 3 and the terminal 4 are made of different materials, they are welded together to achieve electrical connection.

[0042] The side of the conductive connecting piece 3 is exposed between the fusible tube 1 and the cover plate 5, and the terminal 4 can be connected to the side of the conductive connecting piece 3. Of course, in other embodiments, the terminal 4 can also be connected to the second surface of the conductive connecting piece 3 (in which case the closed conductive structure needs to be improved so that the terminal 4 can extend through the cover plate 5), or it can be connected to other positions on the conductive connecting piece 3. The connection position of the terminal 4 on the conductive connecting piece 3 is not limited.

[0043] One feasible assembly method for the fuse in this embodiment (it should be noted that this assembly method is only illustrative and not a limitation of this utility model) is as follows: First, assemble the closed conductive structure at one end of the fuse tube 1. Specifically, pass one end of each of the four fusible elements 2 through the corresponding first through holes 31 on the conductive connecting piece 3, then weld the fusible elements 2 to the conductive connecting piece 3, then insert the four fusible elements 2 into the fuse tube 1, position the conductive connecting piece 3 on the end face of one end of the fusible element 2, then install the anti-arc gasket 6 and the cover plate 5, and fasten the cover plate 5 to the fuse tube 1 with screws 7; then assemble the closed conductive structure at the other end of the fuse tube 1. Specifically, position the conductive connecting piece 3 on the fuse tube 1 (the four first through holes 31 on the conductive connecting piece 3 are respectively fitted onto the four fusible elements 2), bend the four fusible elements 2 and weld them, then install the anti-arc gasket 6, then fill the fuse tube 1 with the arc extinguishing medium through the channel formed by the second through hole 61 and the first through hole 31, and finally cover it with the cover plate 5 and fix the cover plate 5 to the fuse tube 1 with bolts.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A fuse, characterized in that, The molten tube includes a molten tube and at least one molten material disposed within the molten tube; the molten tube is closed at both ends, with at least one end being sealed by a closed conductive structure; the molten tube is filled with an arc-quenching medium; the closed conductive structure includes: A conductive connecting piece covers one end opening of the molten tube, and a terminal is electrically connected to the conductive connecting piece; the conductive connecting piece is provided with a first through hole, through which the molten material passes and is welded to the conductive connecting piece; An anti-arc gasket is provided on the side of the conductive connecting piece away from the fusion tube and covers the first through hole. The anti-arc gasket is provided with a second through hole that communicates with the first through hole. A cover plate is provided on the side of the anti-arc gasket away from the fusion tube, and the cover plate closes the second through hole. The cover plate is fixedly connected to the fusion tube.

2. The fuse according to claim 1, characterized in that, The anti-arc gasket is a barley paper gasket.

3. The fuse according to claim 1, characterized in that, The conductive connecting piece has a first surface and a second surface arranged opposite to each other, with the first surface of the conductive connecting piece facing the inside of the fusible tube. The melt passes through the first through hole and is then welded to the second surface of the conductive connecting piece.

4. The fuse according to claim 3, characterized in that, When the melt passes through the first through hole, it adheres to the side wall of the first through hole. After passing through the first through hole, the melt is bent to adhere to the surface of the conductive connecting piece.

5. The fuse according to claim 4, characterized in that, The portion of the inner wall of the first through hole that is in contact with the melt is a plane.

6. The fuse according to claim 4, characterized in that, The portion of the melt that is in contact with the second surface of the conductive connecting piece has its surface facing away from the conductive connecting piece in contact with the arc-proof gasket.

7. The fuse according to claim 1, characterized in that, The molten tube contains a plurality of molten materials, the conductive connecting piece has a plurality of corresponding first through holes, and the anti-arc pad has a plurality of corresponding second through holes; the molten materials, the first through holes, and the second through holes correspond one-to-one.

8. The fuse according to claim 1, characterized in that, The conductive connecting piece has a mounting groove on the side surface opposite to the fused tube, and the first through hole is located on the bottom surface of the mounting groove. The anti-arc gasket is installed in the mounting groove; the anti-arc gasket is configured to be pressed tightly in the mounting groove by the cover plate, and the side surface of the anti-arc gasket facing away from the bottom surface of the mounting groove is pressed tightly against the cover plate.

9. The fuse according to claim 8, characterized in that, Along the axial direction of the fuse, the conductive connecting piece is disposed between the fuse tube and the cover plate, and the terminal is connected to the side of the conductive connecting piece.

10. The fuse according to claim 1, characterized in that, The conductive connecting piece is welded to the terminal or integrally formed.

Images