Oil-immersed injection type high-voltage fuse

Abstract

The utility model relates to the technical field of high-voltage fuses, in particular to an oil-immersed injection type high-voltage fuse, which comprises a melt and a protective sleeve. An upper electric connecting piece and a lower electric connecting piece are arranged at the upper end and the lower end of the protective sleeve respectively, the melt is arranged in an in-pipe cavity of the protective sleeve from top to bottom in a strip shape, the upper end and the lower end of the melt are electrically communicated with the upper electric connecting piece and the lower electric connecting piece respectively, and the in-pipe cavity is provided with an oil duct towards the outside of the protective sleeve; the problems that a traditional high-voltage fuse easily generates electric arcs and is long in arc extinguishing time are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure fuse technical field, especially a kind of oil-immersed injection type high pressure fuse. BACKGROUND

[0002] High pressure fuse as a kind of safety device for protecting power circuit is the electric appliance that utilizes overload or short-circuit current to melt fuse to disconnect power circuit. The working principle of high pressure fuse is mainly to utilize fuse to be connected in series in power circuit, when the current flowing through fuse exceeds certain value, the heat generated by fuse itself melts fuse automatically, so as to achieve the purpose of breaking circuit, and play the role of overload and short-circuit protection for high-voltage transmission line, current transformer, power capacitor, high-voltage transformer and other electrical equipment.

[0003] In traditional high pressure fuse, when the current of power circuit exceeds the rated current of high pressure fuse, the fuse will be rapidly melted due to reaching melting point, and arc is generated. At this time, the arc-extinguishing material (such as quartz sand) in the fuse tube of traditional high pressure fuse will play a role, absorb the energy of arc, so as to divide and cool the arc, and generate a large amount of gas pressure, which plays a deionization role on arc, so that the arc is quickly extinguished.

[0004] However, the arc-extinguishing mode of traditional high pressure fuse using arc-extinguishing material has a long effective time for high-voltage arc, so that high-voltage arc may leak out and touch the surrounding components of high pressure fuse, which causes the surrounding components to be electrified and has the risk of electric leakage. More importantly, the fuse in the protective sleeve of traditional high pressure fuse is only a small section, and the distance between the two conductive parts is short after the fuse is melted, which is easy to generate arc. In high-voltage environment, arc is more likely to be generated, which is more harmful, and is not conducive to the application of high pressure fuse in high-voltage environment. SUMMARY

[0005] In view of the above defects, the purpose of the utility model is to provide an oil-immersed injection type high pressure fuse, which solves the problem of easy arc generation and long arc-extinguishing time of traditional high pressure fuse.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An oil-immersed injection type high pressure fuse, comprising a fuse and a protective sleeve. The upper end and the lower end of the protective sleeve are respectively provided with an upper electrically conductive connecting piece and a lower electrically conductive connecting piece. The fuse is arranged in the inner cavity of the protective sleeve in a strip shape from top to bottom. The upper end and the lower end of the fuse are in electrical communication with the upper electrically conductive connecting piece and the lower electrically conductive connecting piece respectively. An oil channel is formed in the protective sleeve outside the inner cavity.

[0008] Further, the outer periphery of the fuse is sleeved with at least one layer of self-extinguishing tube.

[0009] Further, the upper and lower electrically conductive connectors are wire connectors or structural connectors; or the upper electrically conductive connector is the wire connector, and the lower electrically conductive connector is the structural connector.

[0010] Further, the wire connector comprises a wire fixing terminal, a flexible connecting short pipe, and a wire; one end of the wire fixing terminal is fixedly connected to the end of the protective sleeve; the flexible connecting short pipe is sleeved on the outer periphery of one end of the wire and is arranged at the other end of the wire fixing terminal; the other end of the wire fixing terminal, the flexible connecting short pipe, and the outer periphery of one end of the wire are fixedly pressed on each other; and one end of the wire is in electrical communication with the end of the melt.

[0011] Further, the tail of the structural connector is detachably arranged at the end of the inner cavity of the pipe; the tail of the structural connector is provided with a plug-in groove, and the end of the melt is plugged into the plug-in groove; and the head of the structural connector is provided with a mounting structure.

[0012] Further, both ends of the wire fixing terminal are half-moon rings; one end of the wire fixing terminal is sleeved on the outer periphery of the flexible connecting short pipe;

[0013] the other end of the wire fixing terminal is inserted into the end of the inner cavity of the pipe and is attached to the cavity wall of the inner cavity of the pipe; the end of the protective sleeve is provided with at least one first fixing through hole, the other end of the wire fixing terminal is provided with a second fixing through hole corresponding to the first fixing through hole, and the first fixing through hole and the second fixing through hole are fixed by a fixing member.

[0014] Further, the tail of the structural connector is provided with an external thread, the end of the inner cavity of the pipe is provided with an internal thread, the external thread and the internal thread are screwed together, and the head of the structural connector abuts against the end surface of the protective sleeve.

[0015] Further, the protective sleeve is made of a material resistant to oil, acid and alkali, high temperature, and insulation.

[0016] Further, the wire fixing terminal is made of tinned copper material, the flexible connecting short pipe is made of red copper material, and the wire is made of copper stranded wire.

[0017] Further, the structural connector is made of tinned copper material.

[0018] The technical scheme provided by the utility model can have the following beneficial effects: the upper end and the lower end of the melt are electrically connected with the upper electric connection piece and the lower electric connection piece respectively, and an electric circuit can be formed by connecting the upper electric connection piece and the lower electric connection piece to an electrical equipment; then the melt is arranged in the tube inner cavity of the protective sleeve in a strip shape from top to bottom, the length of the melt in the tube inner cavity is prolonged, so that the fusing distance is prolonged; meanwhile, an oil channel is arranged in the tube inner cavity towards the outside of the protective sleeve, so that when the fuse is soaked in oil, the oil enters the tube inner cavity through the oil channel, when the melt is fused, the high-temperature melt and the oil react violently to generate a large amount of gas, the two sections of the melt are pulled apart by the gas, arc striking and arc extinguishing are realized more quickly, the time of arc striking and arc extinguishing is reduced, even no arc is generated, the fusing performance is greatly improved, and the fuse can be applied to a higher voltage environment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure schematic view of an oil-immersed jet type high-voltage fuse of one embodiment of the utility model.

[0020] Figure 2 is a front-to-rear sectional view of an oil-immersed jet type high-voltage fuse as Figure 1 indicated.

[0021] Figure 3 is a left-to-right partial sectional view of an oil-immersed jet type high-voltage fuse as Figure 1 indicated.

[0022] Wherein: melt 1, protective sleeve 2, upper electric connection piece 3, lower electric connection piece 4, tube inner cavity 21, oil channel 22, self-extinguishing tube 11, wire connecting piece 31, structure connecting piece 41, wire fixing terminal 311, soft connecting short tube 312, wire 313, plug-in groove 411, mounting structure 412, first fixing hole 23, second fixing hole 3111. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as a limitation on the utility model.

[0024] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features, which are used to distinguish the described features, and there is no order or difference.

[0025] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0026] In the description of the embodiment of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiment of the utility model can be understood according to the specific circumstances.

[0027] The utility model discloses an oil-immersed injection type high-voltage fuse. Figures 1 to 3 The utility model discloses an oil-immersed injection type high-voltage fuse.

[0028] An oil-immersed injection type high-voltage fuse, comprising a fuse body 1 and a protective sleeve 2, the upper end and the lower end of the protective sleeve 2 are respectively provided with an upper electrical connector 3 and a lower electrical connector 4, the fuse body 1 is arranged in the inner cavity 21 of the protective sleeve 2 in a strip shape from top to bottom, the upper end and the lower end of the fuse body 1 are respectively in electrical communication with the upper electrical connector 3 and the lower electrical connector 4, and the inner cavity 21 of the protective sleeve 2 is provided with an oil channel 22 outward.

[0029] The utility model discloses an oil-immersed injection type high-voltage fuse optimal embodiment, such as Figures 1 to 3As shown, the upper end and the lower end of the melt 1 (such as silver-copper alloy or silver-copper-zinc alloy or the like) are respectively in electrical communication with the upper electrical connector 3 and the lower electrical connector 4, and the electrical equipment is connected through the upper electrical connector 3 and the lower electrical connector 4 to form an electrical circuit; then the melt 1 is arranged in a strip shape from top to bottom in the inner cavity 21 of the protective sleeve 2, which prolongs the length of the melt 1 in the inner cavity 21 of the protective sleeve 2, thereby prolonging the fusing distance; at the same time, the oil channel 22 is formed in the inner cavity 21 of the protective sleeve 2, so that when the fuse is immersed in oil, the oil enters the inner cavity 21 of the protective sleeve 2 through the oil channel 22, and when the melt 1 is fused, the high-temperature melt 1 and the oil react violently to generate a large amount of gas, which separates the two sections of the melt 1 and pulls it apart, thereby achieving faster arc extinction and reducing the arc extinction time, or even without generating an arc, greatly improving the fusing performance and enabling the fuse to be applied to a higher voltage environment.

[0030] Further, the melt 1 is at least sleeved with a layer of self-extinguishing tube 11.

[0031] In the embodiment, the self-extinguishing tube 11 (such as an epoxy glass fiber winding tube) can also be used to control the fusing speed of the melt 1; the more layers of self-extinguishing tube 11 that are sleeved, the slower the heat dissipation speed of the melt 1, thereby accelerating the fusing speed; at the same time, the self-extinguishing tube 11 can also be used to prevent the arc from leaking out and play a flame-retardant role. Further, it is considered that the effect of the self-extinguishing tube 11 is becoming smaller and smaller, and therefore two layers of self-extinguishing tube 11 are preferably sleeved on the outer periphery of the melt 1.

[0032] Further, the upper electrical connector 3 and the lower electrical connector 4 are both wire connectors 31 or structure connectors 41; or the upper electrical connector 3 is a wire connector 31, and the lower electrical connector 4 is a structure connector 41.

[0033] In the embodiment, considering that the installation environment of the electrical equipment for installing the high-voltage fuse is different, it is possible that both ends of the fuse are connected by wires; or both ends are connected by structures; or one end is connected by a wire and the other end is connected by a structure; therefore, the upper electrical connector 3 and the lower electrical connector 4 have three setting modes. For example, the high-voltage fuse is installed in a single-phase or three-phase oil-immersed distribution transformer, the wire connector 31 is connected with a primary side winding coil of the transformer, and the structure connector 41 is connected with a conductive rod structure in a high-voltage sleeve (such as a buckle connection, a threaded connection, etc.).

[0034] Further, the wire connector 31 includes a wire fixing terminal 311, a soft connection short tube 312, and a wire 313; one end of the wire fixing terminal 311 is fixedly connected with the end of the protective sleeve 2; the soft connection short tube 312 is sleeved on the outer periphery of one end of the wire 313 and is arranged at the other end of the wire fixing terminal 311; the other end of the wire fixing terminal 311, the soft connection short tube 312, and the outer periphery of one end of the wire 313 are fixedly pressed against each other; and one end of the wire 313 is in electrical communication with the end of the melt 1.

[0035] In this embodiment, when the end (upper or lower) of the protective sleeve 2 is provided with a wire connector 31, it is composed of a fixed terminal 311, a flexible connecting short tube 312, and a wire 313. One end of the fixed terminal 311 is fixedly connected to the end of the protective sleeve 2, and the other end of the fixed terminal 311, the flexible connecting short tube 312, and one end of the wire 313 are pressed together (e.g., using cold pressing pliers) to fix one end of the wire 313. This ensures that after the wire 313 and the end (upper or lower) of the fusible element 1 are electrically connected, it is less likely to be pulled apart by the other end of the wire 313 after being connected to electrical equipment, thus preventing the connection between the wire 313 and the fusible element 1 from being broken.

[0036] It should be noted that a flexible connecting tube 312 is added between the other end of the fixed terminal 311 and one end of the wire 313 to serve as a buffer transition and prevent the wire 313 from being crushed due to excessive force during the clamping process.

[0037] Furthermore, the tail of the structural connector 41 is detachably installed at the end of the cavity 21 inside the tube; the tail of the structural connector 41 is provided with a plug groove 411, and the end of the melt 1 is inserted into the plug groove 411; the head of the structural connector 41 is provided with a mounting structure 412.

[0038] In this embodiment, when the end (upper or lower) of the protective sleeve 2 is provided with a structural connector 41, the installation method is as follows: the tail of the structural connector 41 is detachably installed at the end of the cavity 21 inside the tube, and the end (upper or lower) of the fuse 1 is inserted into the insertion groove 411 at the tail of the structural connector 41 to achieve internal electrical connection of the fuse; the end of the fuse 1 can also be fastened by pressing the tail of the structural connector 41; while the external electrical connection of the fuse is achieved by setting an installation structure 412 at the head of the structural connector 41, such as a threaded hole or a protruding locking block inside the structural connector 41 facing outwards, so as to cooperate with the structure of the electrical equipment installation part to achieve electrical connection.

[0039] Furthermore, both ends of the fixed terminal 311 are semi-circular rings; one end of the fixed terminal 311 is fitted around the outer periphery of the flexible connecting short tube 312.

[0040] The other end of the fixed terminal 311 is inserted into the end of the cavity 21 inside the tube and fits against the cavity wall of the cavity 21. At least one first fixed through hole 23 is opened at the end of the protective sleeve 2. The other end of the fixed terminal 311 is opened with a second fixed through hole 3111 corresponding to the first fixed through hole 23. The first fixed through hole 23 and the second fixed through hole 3111 can be fixed in series by a fastener.

[0041] In this embodiment, one end of the fixed terminal 311 is preferably a crescent ring to fit against the outer periphery of the flexible connecting short tube 312 and form a firm fixing relationship after compression. The other end of the fixed terminal 311 is preferably a crescent ring to fit against the cavity wall of the cavity 21 after being inserted into the end of the tube cavity 21, so that the fixing member (such as screw, pin, etc.) is fixed in series with the first fixing through hole 23 and the second fixing through hole 3111, forming a firm fixing relationship that is not easy to shift.

[0042] Furthermore, the outer circumference of the tail of the structural connector 41 is provided with an external thread, and the end of the inner cavity 21 is provided with an internal thread. The external thread and the internal thread are tightened together, and the head of the structural connector 41 abuts against the end face of the protective sleeve 2.

[0043] In this embodiment, the detachable connection between the structural connector 41 and the end of the tube cavity 21 is preferably a threaded connection, which facilitates disassembly and installation.

[0044] Furthermore, the protective sleeve 2 is made of oil-resistant, acid and alkali-resistant, high-temperature resistant, and insulating materials.

[0045] In this embodiment, since the high-voltage fuse is immersed in oil, in order to make the protective sleeve 2 replaceable and reused after the fuse 1 melts, the protective sleeve 2 is preferably made of oil-resistant, acid and alkali-resistant, high-temperature resistant and insulating materials to extend its service life; for example, epoxy glass fiber wound tube, the high temperature resistance can be selected according to the material of different epoxy glass fiber wound tubes to match the immersion environment of different high-voltage transformers.

[0046] Furthermore, the fixed terminal 311 is made of tin-plated copper, the flexible short tube 312 is made of pure copper, and the conductor 313 is made of copper stranded wire.

[0047] In this embodiment, for aesthetic purposes and to prevent oxidation, the fixed terminal 311 is made of tin-plated copper. Since the high-voltage fuse is immersed in oil, copper stranded wire without a sheath can be used to connect the coil winding of the transformer. Therefore, the conductor 313 is preferably made of copper stranded wire with good conductivity. Furthermore, since the other end of the fixed terminal 311, the flexible connecting tube 312, and the conductor 313 need to be pressed together (e.g., using cold pressing pliers), the bonding force between the tin-plated copper and the copper stranded wire is insufficient after pressing. Adding copper in the middle can improve the bonding force between the three. Therefore, the flexible connecting tube 312 is preferably made of copper.

[0048] Furthermore, the structural connector 41 is made of tin-plated copper.

[0049] In this embodiment, for aesthetic purposes, oxidation prevention, and electrical conductivity, the structural connector 41 is preferably made of tin-plated copper.

[0050] Other components and operations of an oil-immersed jet-type high-voltage fuse according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0051] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An oil-immersed, injection-type high-voltage fuse, characterized in that: It includes a melt and a protective sleeve; the upper and lower ends of the protective sleeve are respectively provided with an upper electrical connector and a lower electrical connector, the melt is arranged in a strip shape from top to bottom in the inner cavity of the protective sleeve, the upper and lower ends of the melt are electrically connected to the upper electrical connector and the lower electrical connector respectively, and the inner cavity of the tube has an oil passage opening outward from the protective sleeve.

2. The oil-immersed injection type high-voltage fuse according to claim 1, characterized in that: The outer periphery of the melt is fitted with at least one layer of self-extinguishing tube.

3. The oil-immersed injection type high-voltage fuse according to claim 1, characterized in that: Both the upper electrical connector and the lower electrical connector are wire connectors or structural connectors; or the upper electrical connector is the wire connector and the lower electrical connector is the structural connector.

4. The oil-immersed injection type high-voltage fuse according to claim 3, characterized in that: The wire connector includes a fixed terminal, a flexible short tube, and a wire; one end of the fixed terminal is fixedly connected to the end of the protective sleeve; the flexible short tube is sleeved on the outer periphery of one end of the wire and is disposed at the other end of the fixed terminal; the other end of the fixed terminal, the flexible short tube, and the outer periphery of one end of the wire are pressed together and fixed; one end of the wire is electrically connected to the end of the molten metal.

5. The oil-immersed injection type high-voltage fuse according to claim 3, characterized in that: The tail of the structural connector is detachably installed at the end of the cavity inside the tube; the tail of the structural connector is provided with a plug groove, and the end of the molten material is inserted into the plug groove; the head of the structural connector is provided with a mounting structure.

6. The oil-immersed injection type high-voltage fuse according to claim 4, characterized in that: Both ends of the fixed terminal are semi-circular rings; one end of the fixed terminal is fitted with a semi-circular ring around the outer periphery of the flexible connecting tube; The other end of the fixed terminal is inserted into the end of the cavity inside the tube and fits against the cavity wall; at least one first fixing through hole is opened at the end of the protective sleeve, and the other end of the fixed terminal is opened with a second fixing through hole corresponding to the first fixing through hole. The first fixing through hole and the second fixing through hole can be fixed in series by a fastener.

7. The oil-immersed injection-type high-voltage fuse according to claim 5, characterized in that: The tail of the structural connector is provided with an external thread, and the end of the cavity inside the tube is provided with an internal thread. The external thread and the internal thread are tightened together, and the head of the structural connector abuts against the end face of the protective sleeve.

8. The oil-immersed injection type high-voltage fuse according to claim 1, characterized in that: The protective sleeve is made of oil-resistant, acid and alkali-resistant, high-temperature resistant, and insulating materials.

9. The oil-immersed injection type high-voltage fuse according to claim 4, characterized in that: The fixed terminal is made of tin-plated copper, the flexible connector tube is made of copper, and the conductor is made of copper stranded wire.

10. The oil-immersed injection type high-voltage fuse according to claim 3, characterized in that: The structural connectors are made of tin-plated copper.

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