Enclosed jet fuse

Abstract

The utility model relates to a closed type jet fuse, which belongs to the technical field of fuses and comprises an electromagnet, a thermistor and a warning ring, the electromagnet is inserted into an opening at the bottom of a porcelain bottle, the thermistor is connected to the outer side of a conductive wire, the thermistor is conductively connected with the electromagnet, and when the temperature of the thermistor rises, the electromagnet loses magnetism; the warning ring is attracted to the lower end of the electromagnet and connected with the conductive wire, and when the warning ring is separated from the electromagnet, the conductive wire is separated from the lead-in wire and / or the lead-out wire; the technical problem that in the prior art, a fuse wire is fused and cannot be repeatedly used, so that the high-altitude maintenance operation difficulty of a fuse on a high-voltage line is increased can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuses, in particular to a closed jet-type fuse. Background Art

[0002] In view of the problems existing in traditional drop-out fuses and the urgent need for safe and reliable operation of power grids, fully insulated enclosed jet fuses were born. This series of fuses overcomes all the shortcomings of traditional drop-out fuses, eliminates the influence of environmental conditions on the performance of fuses, and has performance advantages that traditional drop-out fuses cannot match. However, since its introduction, this new enclosed jet fuse has not attracted the attention of the majority of power workers and the power industry, and its usage is also relatively small, which is not commensurate with the development of the power industry.

[0003] The existing patent with publication number CN220382036U discloses an outdoor fully insulated enclosed ejection type fuse, comprising a porcelain sleeve, an upper end of which is fixedly mounted with an introduction wire, a lower end of which is fixedly mounted with a lead-out wire, an upper static contact at the top end of the porcelain sleeve, the upper static contact is electrically connected to the introduction wire, a lower static contact is electrically connected to the lead-out wire, a fuse carrier, the top end of the fuse carrier is threadedly connected to an upper moving contact, the outer edge of the fuse carrier is sleeved with a lower moving contact, the end of the fuse carrier is fixedly connected with a spring, the other end of the spring is connected to the lower moving contact, a fuse is connected between the upper moving contact and the lower moving contact, the fuse carrier is inserted into the porcelain sleeve, the upper moving contact is clamped with the upper static contact, and the lower moving contact is threadedly connected to the lower static contact.

[0004] The prior art has the following problems:

[0005] When the fuse breaks due to excessive current, the lower moving contact loses its restriction and the fuse carrier is driven by the spring force to eject away from the porcelain sleeve. Because the fuse is blown, it cannot be reused and the fuse carrier needs to be removed and replaced, which increases the difficulty of high-altitude maintenance operations of the fuse in high-voltage lines. Utility Model Content

[0006] The utility model provides a closed ejection type fuse, which can solve the technical problem in the prior art that the blown fuse cannot be reused, which increases the difficulty of high-altitude maintenance operation of the fuse in high-voltage lines.

[0007] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0008] The present application provides a closed jet fuse, which includes an electromagnet, a thermistor and a warning ring. The electromagnet is plugged into the bottom opening of a porcelain bottle, the thermistor is connected to the outside of a conductive wire, the thermistor is conductively connected to the electromagnet, when the temperature of the thermistor rises, the electromagnet loses its magnetism, the warning ring is adsorbed on the lower end of the electromagnet, the warning ring is connected to the conductive wire, when the warning ring is separated from the electromagnet, the conductive wire is separated from the lead-in wire and / or the lead-out wire.

[0009] Through the above technical solution, the thermistor is used to sense the abnormal temperature change of the conductive wire and then control the on and off of the electromagnet to achieve the reuse of the conductive wire, thereby reducing the difficulty of high-altitude maintenance operation of the fuse in the high-voltage line.

[0010] In the utility model, the enclosed ejection type fuse further comprises a vacuum arc extinguishing tube, and the vacuum arc extinguishing tube is connected between the conductive wire and the lead-in wire.

[0011] Through the above technical solution, a vacuum arc extinguishing tube is adopted, which improves the arc extinguishing ability when the conductive wire is separated and increases the safety of use.

[0012] In the utility model, the vacuum arc extinguishing tube comprises a static guide rod and a dynamic guide rod abutting against each other, the static guide rod is connected to the lead-in wire, and the dynamic guide rod is connected to the conductive wire.

[0013] Through the above technical solution, the static guide rod is connected to the lead-in wire, and the dynamic guide rod is connected to the conductive wire, which reduces the movement wear of the vacuum arc extinguishing tube during circuit breaking and improves the repeatability of the vacuum arc extinguishing tube.

[0014] In the utility model, the vacuum arc-extinguishing tube further comprises a gas-generating arc-extinguishing ring, which is sleeved on one end of the moving guide rod facing the static guide rod.

[0015] Through the above technical solution, a gas-generating arc-extinguishing ring is adopted, which increases the arc-extinguishing ability of the vacuum arc-extinguishing tube after leakage occurs, and further ensures the effectiveness of arc extinguishing.

[0016] In the utility model, the closed type jet fuse also includes a lower insulating tube and an upper insulating tube, the lower insulating tube is sleeved on the outside of the conductive wire, one end of the lower insulating tube is connected to the lower end of the lower moving contact, the lower moving contact is plugged into the lower static contact, the lower static contact is connected to the lead-out wire, the end of the lower insulating tube facing away from the lower moving contact is connected to the warning ring, the upper insulating tube is sleeved on the outside of the conductive wire, one end of the upper insulating tube is connected to the upper end of the lower moving contact, and the end of the upper insulating tube facing away from the lower moving contact is connected to the static guide rod.

[0017] Through the above technical solution, the insulating tube is used to reduce the interference of the conductive wire on the electromagnet and the warning ring, thereby improving the effectiveness of the fuse breaking circuit.

[0018] In the utility model, the lower insulating tube is plugged with a plug, and the plug is arranged on a side of the warning ring away from the electromagnet.

[0019] Through the above technical solution, the use of a latch prevents the warning ring from directly falling off the lower insulating tube, further improving the effectiveness of the fuse breaking circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An axonometric view of a closed ejection fuse provided in an embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of a closed ejection fuse provided in an embodiment of the utility model;

[0023] Figure 3 for Figure 2 A local enlarged view of point A in FIG.

[0024] Figure 4 for Figure 2 A local enlarged view of point B in FIG.

[0025] Figure 5 A schematic diagram of the structure of the enclosed ejection type fuse provided by the embodiment of the utility model after the porcelain bottle is removed;

[0026] Figure 6 This is an exploded view of the structure of the enclosed ejection type fuse provided in an embodiment of the utility model after the porcelain bottle is removed.

[0027] Icons: 1-electromagnet; 2-thermistor; 3-warning ring; 4-spring; 5-conductive wire; 501-lower insulating tube; 502-upper insulating tube; 503-lower moving contact; 504-latch; 6-vacuum arc extinguishing tube; 601-arc extinguishing chamber; 602-static guide rod; 603-moving guide rod; 604-gas-generating arc extinguishing ring; 701-porcelain bottle; 702-inlet wire; 703-outlet wire; 704-lower static contact; 705-sealed cover. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Example

[0033] Please refer to Figure 1-Figure 6 , Figure 1-Figure 6 An embodiment of the present application is shown.

[0034] This embodiment provides a closed ejection fuse, such as Figure 2 As shown, it includes an electromagnet 1, a thermistor 2 and a warning ring 3. The thermistor 2 is a positive temperature coefficient thermistor, and its resistance value increases with the increase of temperature. The electromagnet 1 is plugged into the bottom opening of the porcelain bottle 701, the electromagnet 1 is connected in parallel with the conductive wire 5, the thermistor 2 is bonded to the outside of the conductive wire 5, the thermistor 2 is connected in series with the electromagnet 1, when the temperature of the thermistor 2 rises, the electromagnet 1 loses its magnetism, the warning ring 3 is adsorbed on the lower end of the electromagnet 1, the warning ring 3 is connected to the conductive wire 5, when the warning ring 3 is separated from the electromagnet 1, the conductive wire 5 is separated from the lead-in wire 702 and / or the lead-out wire 703.

[0035] When in use, push the insulating rod into Figure 5The partial structure shown in the figure connects the circuit, and is specifically installed into the porcelain bottle 701 by means of a threaded connection. When a circuit fault occurs and needs to be blown, the conductive wire 5 heats up, the temperature of the thermistor 2 increases, causing the resistance value to increase, the current obtained by the electromagnet 1 decreases and loses its magnetism, and the warning ring 3 pops out of the sealed cover 705 downward under the elastic force of the spring 4.

[0036] When power is restored, the insulating rod is used to push the warning ring 3 to confirm that the circuit is connected. Because the temperature of the conductive wire 5 is restored, the electromagnet 1 is powered on and the adsorption force is restored to adsorb the warning ring 3 and resume work.

[0037] It should be noted that a warning color is provided on the outer side of the warning ring 3 to facilitate the staff to observe the working status of the fuse on the ground.

[0038] Through the above technical solution, the thermistor 2 is used to sense the abnormal temperature change of the conductive wire 5 and then control the on and off of the electromagnet 1 to achieve the reuse of the conductive wire 5, reducing the difficulty of high-altitude maintenance operation of the fuse in the high-voltage line.

[0039] As a preferred implementation method, Figure 2 As shown, the enclosed ejection fuse further includes a vacuum arc extinguishing tube 6 , which is connected between the conductive wire 5 and the lead-in wire 702 .

[0040] During use, when the electromagnet 1 is pushed to make the conductive wire 5 move upward, the static guide rod 602 and the moving guide rod 603 will be closed, the power supply is connected to the load, and the current will flow through the load. Conversely, when the moving guide rod 603 moves in the opposite direction, the moving guide rod 603 will separate. At the moment of separation, a vacuum arc will immediately be generated between the guide rods. The vacuum arc is maintained by the metal vapor evaporated from the guide rods until the industrial frequency AC current approaches zero, the metal vapor will almost stop evaporating, and at the same time, the plasma of the vacuum arc will quickly spread to the surroundings, the arc will be extinguished, and the gap between the guide rods will quickly become an insulator, so the current will be disconnected.

[0041] It should be noted that those skilled in the art can purchase the vacuum arc extinguishing tube 6 through a variety of public channels, which will not be separately described or specifically limited here.

[0042] Through the above technical solution, the vacuum arc extinguishing tube 6 is adopted, which improves the arc extinguishing ability when the conductive wire 5 is separated and increases the safety of use.

[0043] As a preferred implementation method, Figure 2 As shown, the vacuum arc extinguishing tube 6 comprises a static guide rod 602 and a dynamic guide rod 603 abutting against each other, the static guide rod 602 is threadedly connected with the lead-in wire 702 , and the dynamic guide rod 603 abuts against the conductive wire 5 .

[0044] Through the above technical solution, the static guide rod 602 is connected to the lead-in wire 702, and the dynamic guide rod 603 is connected to the conductive wire 5, which reduces the movement wear of the vacuum arc extinguishing tube 6 during circuit breaking and improves the repeatability of the vacuum arc extinguishing tube 6.

[0045] As a preferred implementation method, Figure 4 As shown, the vacuum arc extinguishing tube 6 further includes a gas-generating arc extinguishing ring 604 , and the gas-generating arc extinguishing ring 604 is sleeved on one end of the moving guide rod 603 facing the static guide rod 602 .

[0046] When using, Figure 2 and Figure 4 As shown, when the vacuum degree of the arc extinguishing chamber 601 decreases due to repeated use, the arc cannot disappear quickly after the moving guide rod 603 descends. The high temperature generated by the arc melts the thin sheet above the moving guide rod 603 and then acts on the gas-generating arc extinguishing ring 604. The high temperature causes the gas-generating arc extinguishing ring 604 to generate a large amount of gas to blow out the arc.

[0047] Through the above technical solution, the gas-generating arc-extinguishing ring 604 is adopted to increase the arc-extinguishing ability of the vacuum arc-extinguishing tube 6 after leakage occurs, and further ensure the effectiveness of arc-extinguishing.

[0048] As a preferred implementation method, Figure 2 , Figure 5 as well as Figure 6 As shown, the enclosed jet fuse also includes a lower insulating tube 501 and an upper insulating tube 502, the lower insulating tube 501 is sleeved on the outside of the conductive wire 5, one end of the lower insulating tube 501 is connected to the lower end of the lower moving contact 503, the lower moving contact 503 is plugged into the lower static contact 704, the lower static contact 704 is connected to the lead-out wire 703, the end of the lower insulating tube 501 away from the lower moving contact 503 is connected to the warning ring 3, the upper insulating tube 502 is sleeved on the outside of the conductive wire 5, one end of the upper insulating tube 502 is connected to the upper end of the lower moving contact 503, and the end of the upper insulating tube 502 away from the lower moving contact 503 is connected to the static guide rod 602.

[0049] Through the above technical solution, the insulating tube is used to reduce the interference of the conductive wire 5 on the electromagnet 1 and the warning ring 3, thereby improving the effectiveness of the fuse breaking circuit.

[0050] As a preferred implementation method, Figure 3 and Figure 6 As shown, the lower insulating tube 501 is plugged with a plug 504 , and the plug 504 is arranged on the side of the warning ring 3 away from the electromagnet 1 .

[0051] Through the above technical solution, the use of the latch 504 prevents the warning ring 3 from directly falling off the lower insulating tube 501, further improving the effectiveness of the fuse breaking.

[0052] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope recorded in the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. Enclosed ejection fuse, characterized in that: include: The electromagnet (1) is plugged into the bottom opening of the porcelain bottle (701); A thermistor (2) is connected to the outside of the conductive wire (5), the thermistor (2) is conductively connected to the electromagnet (1), and when the temperature of the thermistor (2) rises, the electromagnet (1) loses its magnetism; The warning ring (3) is adsorbed on the lower end of the electromagnet (1), and the warning ring (3) is connected to the conductive wire (5). When the warning ring (3) is separated from the electromagnet (1), the conductive wire (5) is separated from the lead-in wire (702) and / or the lead-out wire (703).

2. The enclosed ejection fuse according to claim 1, characterized in that: Also includes: A vacuum arc extinguishing tube (6) is connected between the conductive wire (5) and the lead-in wire (702).

3. The enclosed ejection fuse according to claim 2, characterized in that: The vacuum arc extinguishing tube (6) comprises a static guide rod (602) and a dynamic guide rod (603) abutting against each other, the static guide rod (602) is connected to the lead-in wire (702), and the dynamic guide rod (603) is connected to the conductive wire (5).

4. The enclosed ejection fuse according to claim 3, characterized in that: The vacuum arc extinguishing tube (6) further comprises: A gas-generating arc-extinguishing ring (604) is sleeved on one end of the moving guide rod (603) facing the static guide rod (602).

5. The enclosed ejection fuse according to claim 3, characterized in that: Also includes: A lower insulating tube (501) is sleeved on the outside of the conductive wire (5), one end of the lower insulating tube (501) is connected to the lower end of the lower moving contact (503), the lower moving contact (503) is plugged into the lower static contact (704), the lower static contact (704) is connected to the lead wire (703), and one end of the lower insulating tube (501) facing away from the lower moving contact (503) is connected to the warning ring (3); The upper insulating tube (502) is sleeved on the outside of the conductive wire (5), one end of the upper insulating tube (502) is connected to the upper end of the lower moving contact (503), and the end of the upper insulating tube (502) facing away from the lower moving contact (503) is connected to the static guide rod (602).

6. The enclosed ejection fuse according to claim 5, characterized in that: The lower insulating tube (501) is plugged with a plug (504), and the plug (504) is arranged on a side of the warning ring (3) facing away from the electromagnet (1).

Images