Fuse carrier and method for manufacturing fuse carrier

Abstract

The present invention provides a fuse carrier and a method for manufacturing the fuse carrier. The fuse carrier comprises: a fuse tube, the inner wall of which has an arc extinguishing layer; two connecting tubes, the two ends of the fuse tube are respectively connected to the two connecting tubes, the interior of the connecting tube is connected to the interior of the fuse tube, and the connecting tube is a variable diameter structure; the circumferential outer surface of the fuse tube and the circumferential outer surface of the connecting tube respectively have a protective layer. The present invention solves the problem of poor performance of the fuse carrier in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, and in particular to a fuse carrier and a method for manufacturing the fuse carrier. Background Art

[0002] The enclosed fuse is a protective device for overload and short circuit in the power system. It is easy to operate, highly adaptable to outdoor environments, and has no exposed metal on the shell. It is used in the primary side of distribution lines and distribution transformers for protection and equipment switching operations. Common enclosed fuses consist of a fuse carrier and a shell. The shell includes a porcelain sleeve, upper and lower insulated leads, upper and lower static contacts, a sealing cover, and a fixed clamp; the fuse carrier consists of a fusion tube, an upper fuse cap, upper and lower connecting hardware, and a spring slider. In normal use, the fixed clamp of the shell is connected to the electric pole, the upper and lower insulated leads are connected to the power line, and the fuse-carrying component equipped with the fuse is completely inserted into the shell and connected to the upper and lower insulated leads through the upper and lower static contacts, so that the whole circuit is turned on; when the circuit is subjected to overcurrent or short circuit, the overheated fuse of the fuse-carrying component breaks to form a fracture and generate an arc, and the arc extinguishing material in the fuse tube also produces high-pressure arc extinguishing gas due to overheating and gasification to extinguish the arc. At the same time, due to the triggering spring slider after the fuse is broken, a part of the fuse-carrying component is ejected from the shell by gravity and the circuit is cut off.

[0003] The existing closed fuse carrier is composed of a fusion tube, an upper fuse cap, upper and lower connecting fittings, a slider and a spring. The fusion tube is composed of an inner arc-extinguishing tube and an outer glass fiber support tube impregnated with epoxy and cured. Among them, one end of the fusion tube is connected to the upper connecting fitting by threading, and then fixed and sealed by a curing agent. The upper fuse cap is located on the top of the upper connecting fitting. After the slider and the spring are inserted from the lower end of the fusion tube, the lower connecting fitting is screwed into the thread of the fusion tube and fixed. Because the fusion tube of the fusion carrier generates a large amount of metal gas at the moment of breaking a large fault current, the large impact force generated by these gases can easily cause the upper connecting fitting and the fusion tube to be pulled apart. At the same time, the curing time, temperature and process of the curing agent are unstable. These gases are easy to leak out of the outside of the fusion tube from the connection between the fusion tube and the upper connecting fitting, causing damage to the parts outside the fusion tube, or even breaking failure.

[0004] Therefore, the prior art has the problem of poor performance of the fuse carrier. Summary of the invention

[0005] The main purpose of the present invention is to provide a fuse carrier and a method for manufacturing the fuse carrier, so as to solve the problem of poor performance of the fuse carrier in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a fuse carrier is provided, comprising: a fuse tube, the inner wall of which has an arc-extinguishing layer; a connecting tube, wherein there are two connecting tubes, the two ends of the fuse tube are respectively connected to the two connecting tubes, the interior of the connecting tube is connected to the interior of the fuse tube, and the connecting tube is a variable diameter structure; the circumferential outer surface of the fuse tube and the circumferential outer surface of the connecting tube respectively have a protective layer.

[0007] Furthermore, the connecting pipe includes a first section, a second section and a third section connected in sequence, the inner diameters and / or outer diameters of the first section, the second section and the third section are different, and at least a portion of the melting tube extends from an end of the third section away from the second section into the third section and is connected to the connecting pipe.

[0008] Furthermore, the inner diameter and / or outer diameter of the first section is greater than the inner diameter and / or outer diameter of the third section; the inner diameter and / or outer diameter of the third section is greater than the inner diameter and / or outer diameter of the second section.

[0009] Furthermore, the inner wall surface at the connection between the second section and the first section and the inner wall surface at the connection between the second section and the third section both have step surfaces, and one end of the melting tube extending into the third section abuts against the step surface at the connection between the second section and the third section.

[0010] Furthermore, the outer wall surface at the connection between the second section and the first section and the outer wall surface at the connection between the second section and the third section both have a transition slope, and the angle between the transition slope and the horizontal direction is 45 degrees.

[0011] Furthermore, the protective layer is composed of glass fiber filaments impregnated with epoxy resin.

[0012] Furthermore, the protective layer is a multi-layer structure, and the angle between the glass fiber filaments of two adjacent layers is greater than or equal to 45 degrees and less than or equal to 50 degrees.

[0013] Furthermore, the arc-extinguishing layer is composed of polymer materials.

[0014] Furthermore, the outer surface of one end of the connecting tube close to the melting tube is a textured surface.

[0015] According to another aspect of the present invention, a method for manufacturing a fuse carrier is provided, which is used to manufacture the above-mentioned fuse carrier, and glass fiber filaments impregnated with epoxy resin are wound on the outer surfaces of the melting tube and the connecting tube, and the wound glass fiber filaments are epoxy-cured to form a protective layer.

[0016] By applying the technical solution of the present invention, the fuse carrier in the present application includes a fusion tube and a connecting tube. The inner wall of the fusion tube has an arc extinguishing layer; there are two connecting tubes, both ends of the fusion tube are respectively connected to the two connecting tubes, the interior of the connecting tube is connected to the interior of the fusion tube, and the connecting tube is a variable diameter structure; the circumferential outer surface of the fusion tube and the circumferential outer surface of the connecting tube respectively have a protective layer.

[0017] When the fuse carrier in the present application is used, since a protective layer is added to the outside of the integral structure formed after the fuse tube and the connecting tube are connected, the sealing performance and strength of the fuse carrier can be effectively improved, and the arc breaking ability of the fuse tube itself is greatly enhanced, and its stability is further improved, so that the insulation performance to the ground in the closed state of the fuse can be improved, making the structure more reasonable. Therefore, the fuse carrier in the present application effectively solves the problem of poor performance of the fuse carrier in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram showing the positional relationship between a fusion tube, a connecting tube and a protective layer of a fuse carrier according to a specific embodiment of the present invention is shown;

[0020] Figure 2 The schematic diagram of the structure of the connecting tube of the fuse carrier of the present application is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Melting tube; 20. Connecting tube; 21. First section; 22. Second section; 23. Third section; 30. Protective layer. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0025] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0026] In order to solve the problem of poor performance of fuse carriers in the prior art, the present application provides a fuse carrier and a method for manufacturing the fuse carrier.

[0027] like Figure 1 and Figure 2 As shown, the fuse carrier in the present application includes a melting tube 10 and a connecting tube 20. The inner wall of the melting tube 10 has an arc extinguishing layer; there are two connecting tubes 20, and the two ends of the melting tube 10 are respectively connected to the two connecting tubes 20, the interior of the connecting tube 20 is connected to the interior of the melting tube 10, and the connecting tube 20 is a variable diameter structure; the circumferential outer surface of the melting tube 10 and the circumferential outer surface of the connecting tube 20 respectively have a protective layer 30.

[0028] When the fuse carrier in the present application is used, since a protective layer 30 is added to the outside of the integral structure formed after the fuse tube 10 and the connecting tube 20 are connected, the sealing performance and strength of the fuse carrier can be effectively improved, and the arc breaking capability of the fuse tube 10 itself is greatly enhanced, and its stability is further improved, so that the insulation performance to the ground in the closed state of the fuse can be improved, making the structure more reasonable. Therefore, the fuse carrier in the present application effectively solves the problem of poor performance of the fuse carrier in the prior art.

[0029] It should be noted that the connecting tubes 20 at both ends of the fusion tube 10 in the present application can replace the upper metal connector and the lower metal connector in the prior art. Similarly, the fuse carrier in the present application can also include structures such as sliders and springs in the prior art.

[0030] Preferably, in the present application, the circumferential outer surface of the integral structure formed by connecting the melting tube 10 and the connecting tube 20 has a protective layer 30 .

[0031] In a specific embodiment of the present application, the connecting pipe 20 includes a first section 21, a second section 22 and a third section 23 connected in sequence, the inner diameter and the outer diameter of the first section 21, the second section 22 and the third section 23 are all different, and at least a portion of the melting tube 10 extends from one end of the third section 23 away from the second section 22 into the third section 23 and is connected to the connecting pipe 20.

[0032] Specifically, the inner wall surface at the connection between the second section 22 and the first section 21 and the inner wall surface at the connection between the second section 22 and the third section 23 both have step surfaces, and one end of the melting tube 10 extending into the third section 23 abuts against the step surface at the connection between the second section 22 and the third section 23.

[0033] Specifically, the outer wall surface at the connection between the second section 22 and the first section 21 and the outer wall surface at the connection between the second section 22 and the third section 23 both have a transition slope, and the angle between the transition slope and the horizontal direction is 45 degrees.

[0034] Optionally, the inner diameter and outer diameter of the first section 21 are greater than the inner diameter and outer diameter of the third section 23 ; the inner diameter and outer diameter of the third section 23 are greater than the inner diameter and outer diameter of the second section 22 .

[0035] In a specific embodiment of the present application, the inner diameter of the melting tube 10 is equal to the inner diameter of the second section 22 .

[0036] That is, in this embodiment, the inner tube wall and the outer surface in the length direction of the connecting tube 20 both have step surfaces. The purpose of providing the step surface on the outer surface in the length direction of the connecting tube 20 is to more conveniently provide the protective layer 30. Moreover, the step surface of the outer surface is formed by a transition slope.

[0037] Therefore, in a specific embodiment of the present application, the exterior of the connecting tube 20 has a three-stage stepped structure, and the second stage 22 is lower than the first stage 21 and the third stage 23 , thereby effectively preventing the protective layer 30 and the connecting tube 20 from being separated from each other.

[0038] Specifically, the protective layer 30 is composed of glass fiber filaments impregnated with epoxy resin.

[0039] Specifically, the protective layer 30 is a multi-layer structure, and the angle between the glass fiber yarns of two adjacent layers is greater than or equal to 45 degrees and less than or equal to 50 degrees. This arrangement can ensure that the protective layer 30 can provide sufficient mechanical strength for the entire melting tube 10 and ensure sufficient sealing for the connection between the melting tube 10 and the connecting tube 20.

[0040] Specifically, the arc-extinguishing layer is composed of polymer materials and is wound into a tube to form an arc-extinguishing tube. During the breaking process of the melting tube 10, a large amount of gas such as aluminum hydroxide can be instantly generated in the arc-extinguishing tube due to the high temperature, which can extinguish the arc in a short time. The two ends of the arc-extinguishing tube are inserted into the third section 23 of the connecting tube 20 to facilitate the flow of arc-extinguishing gas during the breaking process.

[0041] Specifically, the outer surface of the end of the connecting tube 20 close to the melting tube 10 is a reticulated surface. In addition, it should be noted that in the present application, the connecting tube 20 is made of stainless steel. By setting it in this way, the torsional strength after the glass fiber filaments of the protective layer 30 are combined with the stainless steel outer surface of the connecting tube 20 can be ensured.

[0042] Optionally, the connecting pipe 20 and the melting pipe 10 are connected via threads.

[0043] In addition, the manufacturing method of the fuse carrier in the present application is used to manufacture the above-mentioned fuse carrier, and the glass fiber filaments impregnated with epoxy resin are wound on the outer surface of the melting tube 10 and the connecting tube 20, and the wound glass fiber filaments are epoxy-cured to form a protective layer 30.

[0044] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0045] 1. Effectively solve the problem of poor performance of fuse carriers in the prior art;

[0046] 2. Simple structure and stable performance.

[0047] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fuse carrier, characterized in that: include: A melting tube (10), wherein the inner wall of the melting tube (10) has an arc-extinguishing layer; Connecting pipes (20), there are two connecting pipes (20), both ends of the melting pipe (10) are respectively connected to the two connecting pipes (20), the interior of the connecting pipe (20) is communicated with the interior of the melting pipe (10), and the connecting pipe (20) is a variable diameter structure; The circumferential outer surface of the melting tube (10) and the circumferential outer surface of the connecting tube (20) are respectively provided with a protective layer (30); The connecting pipe (20) comprises a first section (21), a second section (22) and a third section (23) which are connected in sequence, the inner diameters and / or outer diameters of the first section (21), the second section (22) and the third section (23) are all different, and at least a portion of the melting tube (10) extends from an end of the third section (23) away from the second section (22) into the third section (23) and is connected to the connecting pipe (20).

2. The fuse carrier according to claim 1, characterized in that: The inner diameter and / or outer diameter of the first section (21) is greater than the inner diameter and / or outer diameter of the third section (23); The inner diameter and / or outer diameter of the third section (23) is greater than the inner diameter and / or outer diameter of the second section (22).

3. The fuse carrier according to claim 1, characterized in that: The inner wall surface at the connection between the second section (22) and the first section (21) and the inner wall surface at the connection between the second section (22) and the third section (23) both have step surfaces, and one end of the melting tube (10) extending into the third section (23) abuts against the step surface at the connection between the second section (22) and the third section (23).

4. The fuse carrier according to claim 1, characterized in that: The outer wall surface at the connection between the second section (22) and the first section (21) and the outer wall surface at the connection between the second section (22) and the third section (23) both have a transition slope, and the angle between the transition slope and the horizontal direction is 45 degrees.

5. The fuse carrier according to any one of claims 1 to 4, characterized in that: The protective layer (30) is composed of glass fiber filaments impregnated with epoxy resin.

6. The fuse carrier according to claim 5, characterized in that: The protective layer (30) is a multi-layer structure, and the angle between the glass fiber filaments of two adjacent layers is greater than or equal to 45 degrees and less than or equal to 50 degrees.

7. The fuse carrier according to any one of claims 1 to 4, characterized in that: The arc-extinguishing layer is composed of polymer materials.

8. The fuse carrier according to any one of claims 1 to 4, characterized in that: The outer surface of one end of the connecting tube (20) close to the melting tube (10) is a reticulated surface.

9. A method for manufacturing a fuse carrier, characterized in that: Used to manufacture a fuse carrier according to any one of claims 1 to 8, glass fiber filaments impregnated with epoxy resin are wound on the outer surfaces of a melting tube (10) and a connecting tube (20), and the wound glass fiber filaments are epoxy-cured to form a protective layer (30).

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