Drop-out fuse

Abstract

The invention discloses a drop-out fuse, and relates to the technical field of short-circuit protection switches. Comprising an insulator; the upper support arm is fixed at the upper end of the insulator and is provided with an elastic clamping contact mechanism; the lower supporting arm is fixed at the lower end of the insulator, is arranged on the same side with the upper supporting arm and is provided with a pawl and a jacking spring, the pawl can slide up and down relative to the lower supporting arm, and the jacking spring is used for driving the pawl to move in the direction away from the upper supporting arm; the flicking device is mounted on the lower support arm; the lower end of the fusion tube is hinged to the lower supporting arm, the upper end of the fusion tube can be clamped with the elastic clamping contact mechanism, a ratchet wheel is fixed to the lower end of the fusion tube, and under the condition that the ratchet wheel is matched with the pawl, the fusion tube can be limited to rotate towards one end away from the insulator; and the fuse wire is arranged in the fusion tube in a penetrating manner, one end of the fuse wire is fixedly connected with the lower support arm, and the other end of the fuse wire can be clamped with the elastic clamping contact mechanism and is in transmission connection with the pawl. According to the invention, the connection stability of the fusion tube under the switching-on condition can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of short-circuit protection switches, and in particular to a drop-out type fuse. Background Art

[0002] Drop-out fuses are economical, easy to operate, and highly adaptable to outdoor environments. They are widely used in 10kV distribution lines and the primary side of distribution transformers for protection and equipment switching operations. Drop-out fuses consist of upper contacts, lower contacts, operating rings, fuse tubes, fuses, insulators, and mounting arms. The fuse is installed in the fuse tube, with one end fixed to the lower end of the fuse tube and the other end tightening the upper pressure plate to maintain the passage state of the fuse. When the fuse blows, the tension of the fuse on the pressure plate disappears, and the upper contact slips off the tongue. Under the action of the fuse tube's own gravity and the upper and lower static contact springs, the fuse tube rotates around the hinge axis and falls rapidly, disconnecting the circuit and cutting off the faulty line or faulty equipment.

[0003] The inventors have found that the existing drop-out fuses fix the fuse tube between the upper and lower mounting arms by hingedly connecting the lower contact with the lower mounting arm and compressing the contact spring, and elastically clamping the upper contact with the upper mounting arm. Although the circuit is connected, the elastic clamping of the upper contact with the mounting arm needs to overcome the tilting gravity of the fuse tube and the rebound force of the contact spring, and the stability of the closing is low. The power transmission lines located in the mountainous canyon area are often subject to strong winds, and the fuse tubes often become loose and cannot work normally, and the fuses flash, which in turn affects the normal power transmission of the transmission lines. Summary of the invention

[0004] In view of the technical problem of low stability of the existing drop-out type fuse switch connection, the present invention provides a drop-out type fuse, which ensures the stability of the connection of the fuse tube when the switch is closed through the cooperation of the ratchet mechanism and the spring opener, so as to avoid the situation where the fuse tube becomes loose and cannot work normally and the fuse flashes when the drop-out type fuse is operated in high mountain canyon areas. The present invention is suitable for power transmission lines in high mountain canyon areas, and the ratchet pawl of the ratchet mechanism releases the restriction on the ratchet after the fuse is disconnected, and does not affect the rotation and falling of the fuse tube, thereby providing guarantee for the normal power transmission of the transmission line.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a drop-out type fuse, comprising: an insulator, a mounting support is arranged in the middle; an upper arm is fixed to the upper end of the insulator and is provided with an elastic locking mechanism; a lower arm is fixed to the lower end of the insulator and is arranged on the same side as the upper arm, and is provided with a ratchet and a pressure spring, the ratchet can slide up and down relative to the lower arm, and the pressure spring is used to drive the ratchet to move in a direction away from the upper arm; a pop-up device is installed on the lower arm; a fusion tube, the lower end of which is hinged to the lower arm and the upper end of which can be locked with the elastic locking mechanism, and a ratchet is fixed to the lower end of the fusion tube. When the ratchet and the pawl cooperate, the fuse tube can be restricted from rotating toward the end away from the insulator; the fuse is inserted into the fuse tube, one end of which is fixedly connected to the lower arm, and the other end of which can be engaged with the elastic contact mechanism, and is transmission-connected to the pawl; wherein, in the process of the fuse tube rotating toward the insulator, the fuse is driven to tighten and squeeze the ejector, and the pawl is driven by the fuse to compress the top pressure spring so that the pawl is in a state of cooperation with the ratchet, and when the fuse is blown, the top pressure spring drives the pawl to reset to release the restriction on the ratchet.

[0007] The drop-out fuse provided by the present invention comprises an insulator, an upper arm, a lower arm, a pop-up device, a fusion tube and a fuse. The upper arm and the lower arm are arranged on the same side and are arranged at the corresponding ends of the insulator. An elastic locking mechanism is arranged on the upper arm, and the lower arm is provided with a ratchet and a top pressure spring. The ratchet can slide up and down relative to the lower arm. The top pressure spring is used to drive the ratchet to move in a direction away from the upper arm. The pop-up device is installed on the lower arm. The lower end of the fusion tube is hinged to the lower arm, and the upper end can be locked with the elastic locking mechanism. A ratchet is fixed to the lower end of the fusion tube. The fuse is passed through the fusion tube, one end of which is fixedly connected to the lower arm, and the other end can be locked with the elastic locking mechanism, and is transmission connected with the ratchet.

[0008] The spring is then pressed against the insulator to limit the rotation of the fuse and the spring is then pressed against the insulator, and the spring is then pressed against the insulator to limit the rotation of the fuse.

[0009] In addition, after the fuse blows, the squeezing force of the fuse on the ratchet disappears. At this time, the pawl is driven to reset under the action of the rebound force of the top pressure spring to release the restriction on the ratchet, so that the fuse tube can rotate away from the insulator and the rebound force of the ejector pushes the fuse tube away from the insulator. Combined with the gravity of the fuse tube itself, the fuse tube immediately rotates around the hinge axis and falls after the fuse blows, thereby disconnecting the circuit and cutting off the faulty section of the line or the faulty equipment.

[0010] In summary, the drop-out fuse provided by the present invention can ensure the stability of the connection of the fuse tube when the circuit is closed, so as to avoid the situation where the fuse tube becomes loose and cannot work normally and the fuse flashes when the drop-out fuse is operating in a high mountain canyon area. It is suitable for power transmission lines in high mountain canyon areas and does not affect the rotation and drop of the fuse tube, thereby providing guarantee for the normal power transmission of the transmission lines.

[0011] In an optional embodiment of the present application, the elastic latching mechanism includes a latching groove, a tongue spring is provided at the bottom of the latching groove, and the tongue spring can apply a top pressure directed to the lower arm to the fuse tube, so that the connection portion between the fuse tube and the elastic latching mechanism is located in the latching groove, so as to limit the side wall of the fuse tube by the latching groove, thereby further improving the stability of the connection after the fuse tube is closed.

[0012] In an optional embodiment of the present application, the tongue reed includes a connected guide section and a pressing section, the guide section is inclined from the bottom of the contact groove toward the lower branch arm and extends toward the insulator, and the pressing section is connected to the lower end of the guide section to facilitate connecting the fuse tube with the tongue reed and ensure that the tongue reed can apply a top pressure to the fuse tube directed toward the lower branch arm.

[0013] In an optional embodiment of the present application, the lower support arm is provided with a vertical sliding hole and a tensioning pin wheel, the upper end of the vertical sliding hole is provided with a first limiting portion, and the lower end is provided with a second limiting portion, the tensioning pin wheel is located on the inner side of the fuse, the fuse is penetrated on the side of the lower end of the fuse tube away from the insulator, and during the rotation of the fuse tube toward the insulator, the fuse is limited by the tensioning pin wheel to tighten the fuse; the pawl includes a sliding rod and a tooth rod, the sliding rod is inserted in the vertical sliding hole, and the sliding rod can slide along its own length direction; the sliding rod is provided with a threading hole and a top pressing step, the middle part of the fuse is penetrated in the threading hole In the wire hole, the top pressure spring is sleeved on the middle part of the slide rod, and the top pressure spring is located between the first limiting part and the top pressure step, and the middle part of the slide rod is limited in the vertical slide hole through the cooperation between the top pressure step and the second limiting part; the tooth rod is slidably sleeved on the upper end of the slide rod, and the tooth rod can elastically expand and contract relative to the slide rod; when the fuse drives the pawl to compress the top pressure spring to a state of cooperation with the ratchet, the upper end of the tooth rod abuts against the side wall of the ratchet to ensure that the ratchet can cooperate with the pawl during the closing process of the fuse tube, and the top pressure spring can drive the pawl to reset when the fuse is blown.

[0014] In an optional embodiment of the present application, the lower end of the gear rod is slidably sleeved on the outside of the upper end of the slide rod; the lower end of the gear rod is provided with a third limiting portion, and the upper end of the slide rod is provided with a fourth limiting portion, and the lower end of the gear rod is restricted on the slide rod through the cooperation of the third limiting portion and the fourth limiting portion; a telescopic spring is provided in the gear rod, and the telescopic spring is located between the fourth limiting portion and the top of the inner cavity of the gear rod, so that the gear rod can avoid when the ratchet rotates forward and limit it when the ratchet rotates reversely, and at the same time, it can also prevent the gear rod from slipping off the slide rod and reset with the slide rod under the action of the top pressure spring.

[0015] In an optional embodiment of the present application, the pawl also includes a pull ring, which is located below the sliding rod; the pull ring is transmission-connected to the tooth rod, and the fuse drives the pawl to compress the top pressure spring to a state of cooperating with the ratchet. By pulling the pull ring, the upper end of the tooth rod can be pulled away from the ratchet side wall to release the restriction on the ratchet, thereby ensuring that the fuse rod can be manually disconnected under the drive of the insulating pull rod, thereby meeting the circuit breaking requirements during daily line maintenance and equipment repair.

[0016] In an optional embodiment of the present application, a transmission hole is provided in the middle of the sliding rod, and the transmission hole vertically penetrates the sliding rod; a transmission pull rod is passed through the transmission hole, and one end of the transmission pull rod is connected to the pull ring and the other end is connected to the gear rod, so as to ensure that the pull rod can pull the gear rod to release the engagement between the pawl and the ratchet.

[0017] In an optional embodiment of the present application, the fuse includes a connected fuse section, a connector and a connecting section, the connecting section is fixedly connected to the lower arm at one end and is transmission connected to the pawl in the middle, and the fuse section can be electrically connected to the elastic contact mechanism to ensure that the fuse can drive the pawl to move while working normally.

[0018] In an optional embodiment of the present application, a plurality of fuse sections are provided, one end of each of the fuse sections is connected to the connector, and the other end of each of the fuse sections is connected to a moving contact, and the moving contact can be electrically connected to the elastic contact mechanism; the moving contact is provided at one end of the fuse tube away from the lower support arm, and a plurality of the moving contacts are arranged in sequence at intervals along the rotation direction of the fuse tube, and the lengths of the plurality of fuse sections become shorter in sequence along the rotation direction of the fuse tube; the connector can be retracted so that the connecting section and the fuse section with the shortest length remain in a tensioned state; when the fuse tube is closed, only the moving contact connected to the connecting section in a tensioned state is electrically connected to the elastic contact mechanism, so that after the fuse tube is blown, there is no need to remove the fuse tube from the circuit and then install the fuse, thereby achieving the effect of quickly connecting the circuit, and the circuit recovery operation is simple and the recovery efficiency is high.

[0019] In an optional embodiment of the present application, the connector includes: an upper connector, which is connected to the fuse section; a tension spring, whose upper end is connected to the upper connector; a lower connector, which is connected to the lower end of the tension spring, and the lower connector is connected to the connecting section; a bridging guide rope, one end of the bridging guide rope is connected to the upper connector and the other end is connected to the lower connector, and the length of the bridging guide rope is greater than the length of the tension spring, so as to ensure that the fuse connected to the circuit can remain in a tensioned state.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] The drop-out fuse provided by the present invention comprises an insulator, an upper arm, a lower arm, a pop-up device, a fusible tube and a fuse. The upper arm and the lower arm are arranged on the same side and are arranged at the corresponding ends of the insulator. An elastic locking mechanism is arranged on the upper arm, and a ratchet and a top pressure spring are arranged on the lower arm. The ratchet can slide up and down relative to the lower arm, and the top pressure spring is used to drive the ratchet to move in a direction away from the upper arm. The pop-up device is installed on the lower arm, the lower end of the fusible tube is hinged to the lower arm, and the upper end can be locked with the elastic locking mechanism, and a ratchet is fixed to the lower end of the fusible tube. The fuse is passed through the fusible tube, one end of which is fixedly connected to the lower arm, and the other end of which can be locked with the elastic locking mechanism. , and is connected to the ratchet transmission. During the closing process, the fuse tube rotates toward the insulator and drives the fuse to tighten and squeeze the pop-up device. The cooperation of the ratchet and the pawl limits the fuse tube to rotate (reverse) toward the end away from the insulator. At the same time, the reaction force of the pop-up device being squeezed acts on the fuse tube in real time, and the upper end of the fuse tube cooperates with the elastic card contact mechanism after closing. Therefore, through the cooperation of the pop-up device and the ratchet mechanism, the stability of the connection of the fuse tube in the closing state can be ensured, so as to avoid the situation where the fuse tube becomes loose and cannot work normally and the fuse flashes when the drop-out fuse is operating in the high mountain canyon area. It is suitable for transmission lines in the high mountain canyon area. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] In the attached picture:

[0024] Figure 1 It is a schematic structural diagram of a drop-out fuse according to an embodiment of the present invention;

[0025] Figure 2 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged structure of part A;

[0026] Figure 3 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged structure of part B;

[0027] Figure 4 This is a schematic diagram of the structure of a pawl according to an embodiment of the present invention;

[0028] Figure 5 For the embodiment of the present invention Figure 1 Schematic diagram of the enlarged structure of part C;

[0029] Figure 6It is a schematic diagram of the structure of the ejector according to an embodiment of the present invention.

[0030] Marks and corresponding parts names in the attached drawings:

[0031] 100-insulator, 110-mounting support;

[0032] 200-upper support arm, 210-elastic contact mechanism, 211-contact groove, 212-tongue spring, 212a-guide section, 212b-pressing section;

[0033] 300-lower arm, 310-pawl, 311-sliding rod, 311a-threading hole, 311b-pressing step, 311c-fourth limiting portion, 311d-transmission hole, 312-tooth rod, 312a-third limiting portion, 313-telescopic spring, 314-pull ring, 315-transmission pull rod, 320-pressing spring, 330-vertical sliding hole, 331-first limiting portion, 332-second limiting portion, 340-tensioning pin wheel;

[0034] 400-pop-up device, 410-pop-up housing, 420-pop-up piston rod, 430-pop-up spring;

[0035] 500-melting tube, 510-ratchet;

[0036] 600-fuse, 610-fusible section, 620-connector, 621-upper connector, 622-tension spring, 623-lower connector, 624-bridging guide rope, 630-connecting section, 640-moving contact. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0038] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or is the orientation or positional relationship in which the device of the application is usually placed when in use, or is the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application. At the same time, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Example

[0040] Combination Figure 1 The present embodiment provides a drop-out fuse, comprising: an insulator 100, a mounting support 110 being provided in the middle; an upper arm 200, fixed to the upper end of the insulator 100, and provided with an elastic contact mechanism 210; a lower arm 300, fixed to the lower end of the insulator 100, and provided on the same side as the upper arm 200, and provided with a ratchet 310 and a pressure spring 320, wherein the ratchet 310 can slide up and down relative to the lower arm 300, and the pressure spring 320 is used to drive the ratchet 310 to move away from the upper arm 200; an ejector 400, mounted on the lower arm 300; a fuse tube 500, the lower end of which is hinged to the lower arm 300, the upper end of which can be engaged with the elastic contact mechanism 210, and the lower end of the fuse tube 500 is fixed with a ratchet 510 , when the ratchet 510 cooperates with the pawl 310, the fuse tube 500 can be restricted from rotating toward the end away from the insulator 100; the fuse 600 is inserted into the fuse tube 500, one end of which is fixedly connected to the lower arm 300, and the other end of which can be engaged with the elastic contact mechanism 210, and is transmission-connected with the pawl 310; wherein, in the process of the fuse tube 500 rotating toward the insulator 100, the fuse 600 is driven to tighten and squeeze the ejector 400, and the pawl 310 is driven by the fuse 600 to compress the top pressure spring 320 so that the pawl 310 is in a state of cooperating with the ratchet 510, and when the fuse 600 is blown, the top pressure spring 320 drives the pawl 310 to reset to release the restriction on the ratchet 510.

[0041] Combination Figure 2The elastic contact mechanism 210 includes a contact groove 211, and a tongue spring 212 is provided at the bottom of the contact groove 211. The tongue spring 212 can apply a top pressure directed to the lower arm 300 to the fusion tube 500, so that the connection portion of the fusion tube 500 and the elastic contact mechanism 210 is located in the contact groove 211, so that the side wall of the fusion tube 500 is limited by the contact groove 211, and the stability of the connection after the fusion tube 500 is closed is further improved.

[0042] Specifically, the tongue reed 212 includes a connected guide section 212a and a pressing section 212b. The guide section 212a is inclined from the bottom of the contact groove 211 toward the lower arm 300 and extends toward the insulator 100. The pressing section 212b is connected to the lower end of the guide section 212a to facilitate connecting the fuse tube 500 with the tongue reed 212 and ensure that the tongue reed 212 can apply a top pressure to the fuse tube 500 directed to the lower arm 300.

[0043] Combination Figure 3 and Figure 4 The lower arm 300 is provided with a vertical sliding hole 330 and a tensioning pin wheel 340, the upper end of the vertical sliding hole 330 is provided with a first limiting portion 331, and the lower end is provided with a second limiting portion 332, the tensioning pin wheel 340 is located on the inner side of the fuse 600, the fuse 600 is penetrated on the side of the lower end of the fuse tube 500 away from the insulator 100, and during the rotation of the fuse tube 500 toward the insulator 100, the fuse 600 is limited by the tensioning pin wheel 340 to tighten the fuse 600; the ratchet 310 includes a sliding rod 311 and a toothed rod 312, the sliding rod 311 is inserted into the vertical sliding hole 330, and the sliding rod 311 can slide along its own length direction; the sliding rod 311 is provided with a threading hole 311a and a top The middle part of the fuse 600 is inserted into the threading hole 311a, the top pressure spring 320 is sleeved on the middle part of the slide bar 311, and the top pressure spring 320 is located between the first limiting portion 331 and the top pressure step 311b, and the middle part of the slide bar 311 is limited in the vertical slide hole 330 through the cooperation of the top pressure step 311b and the second limiting portion 332; the toothed rod 312 is slidably sleeved on the upper end of the slide bar 311, and the toothed rod 312 can be elastically retracted relative to the slide bar 311; when the fuse 600 drives the pawl 310 to compress the top pressure spring 320 to a state of cooperation with the ratchet 510, the upper end of the toothed rod 312 abuts against the side wall of the ratchet 510.

[0044] Thus, when the fusion tube 500 is in a natural state (opening state), the lower end surface of the pressing step 311b on the slide bar 311 abuts against the second limiting portion 332 through the action of the pressing spring 320, so as to limit the downward stroke of the slide bar 311 through the second limiting portion 332. During the rotation of the fusion tube 500, the fuse 600 slides relative to the threading hole 311a, at which time, the tensioning pin wheel 340 abuts against the inner side wall of the fuse 600, and as the fusion tube 500 rotates, the fuse 600 is tensioned by the tensioning pin wheel 340 to limit the fuse 600, and the length of the fuse 600 in the fusion tube 500 is shortened, forcing the fuse 600 to push the slide bar 311 upward, so as to release the fuse 600 through the upward movement of the slide bar 311, so as to compensate for the length of the fuse 600 to ensure that the fusion tube 500 can rotate smoothly, and drive the ratchet 310 to compress the pressing spring 320. The toothed rod 312 is sleeved outside the slide bar 311 and can be elastically retracted relative to the slide bar 311, ensuring that the toothed rod 312 can avoid the ratchet 510 when it rotates in the forward direction. Therefore, the ratchet 510 can cooperate with the pawl 310 during the closing process of the fuse 500, and the pressing spring 320 can drive the pawl 310 to reset when the fuse 600 is blown.

[0045] The third limit portion 312a is provided at the lower end of the gear rod 312, and the fourth limit portion 311c is provided at the upper end of the slide rod 311. The lower end of the gear rod 312 is limited on the slide rod 311 through the cooperation of the third limit portion 312a and the fourth limit portion 311c. The gear rod 312 is provided with a telescopic spring 313, which is located between the fourth limit portion 311c and the top of the inner cavity of the gear rod 312, so that the gear rod 312 can avoid when the ratchet wheel 510 rotates forward and limit it when the ratchet wheel 510 rotates reversely. At the same time, the gear rod 312 can be prevented from slipping off the slide rod 311 and reset with the slide rod 311 under the action of the top pressure spring 320.

[0046] In this embodiment, the pawl 310 also includes a pull ring 314, and the pull ring 314 is located below the sliding rod 311; the pull ring 314 is transmission-connected with the tooth rod 312, and the fuse 600 drives the pawl 310 to compress the top pressure spring 320 to a state of cooperating with the ratchet 510. By pulling the pull ring 314, the upper end of the tooth rod 312 can be pulled away from the side wall of the ratchet 510 to release the restriction on the ratchet 510, ensuring that the fuse rod can be manually disconnected under the drive of the insulating pull rod, thereby meeting the circuit breaking requirements during daily line maintenance and equipment repair.

[0047] It can be understood that a transmission hole 311d is provided in the middle of the sliding rod 311, and the transmission hole 311d vertically penetrates the sliding rod 311; a transmission pull rod 315 is passed through the transmission hole 311d, and one end of the transmission pull rod 315 is connected to the pull ring 314 and the other end is connected to the gear rod 312 to ensure that the pull rod can pull the gear rod 312 to release the coordination between the pawl 310 and the ratchet 510.

[0048] Combination Figure 5 The fuse 600 includes a connected fuse section 610, a connector 620 and a connecting section 630. The connecting section 630 is fixedly connected to the lower arm 300 at one end and is transmission-connected to the pawl 310 in the middle. The fuse section 610 can be electrically connected to the elastic contact mechanism 210 to ensure that the fuse 600 can drive the pawl 310 to move while working normally.

[0049] On this basis, the fuse sections 610 are provided with a plurality of them, one end of each of the fuse sections 610 is connected to the connector 620, and the other end of each of the fuse sections 610 is connected to a moving contact 640, and the moving contact 640 can be electrically connected to the elastic contact mechanism 210; the moving contact 640 is arranged at one end of the fuse tube 500 away from the lower support arm 300, and the plurality of moving contacts 640 are arranged in sequence at intervals along the rotation direction of the fuse tube 500, and the lengths of the plurality of fuse sections 610 are shortened in sequence along the rotation direction of the fuse tube 500; the connector 620 can be retracted and retracted so that the connecting section 630 and the fuse section 610 with the shortest length remain in a tensioned state; when the fuse tube 500 is closed, only the moving contact 640 connected to the connecting section 630 in a tensioned state is electrically connected to the elastic contact mechanism 210.

[0050] It should be noted that the existing drop-out fuse is only adapted to one fuse 600. After the fuse 600 is blown, the fuse tube needs to be removed from the circuit (the fuse is installed overhead), and then the fuse 600 needs to be replaced. The operation is complicated and inefficient, and it is necessary to climb the overhead frame, which is labor-intensive. In this embodiment, a plurality of fuse sections 610 are provided, and each fuse section 610 is connected to a moving contact 640. The plurality of moving contacts 640 are arranged in sequence along the rotation direction of the fuse tube 500, and the lengths of the plurality of fuse sections 610 are shortened in sequence. The connector 620 can be extended and retracted to compensate for the length of the fuse section 610. When the fuse tube 500 rotates, the fuse section 610 with the shortest length remains in a tensioned state, and after closing the circuit, only the moving contact 640 connected to the tensioned connecting section 630 elastically contacts the machine. The structure 210 is electrically connected to connect the tensioned fuse section 610 in the circuit. Therefore, after the fuse tube 500 is blown, the corresponding moving contact 640 falls off the fuse tube 500 as the fuse tube 500 rotates and falls. When the circuit is rotated again to close, the shortest fuse section 610 among the remaining fuse sections 610 is tensioned and connected to the circuit to achieve closing, without removing and reinstalling the fuse 600 from the circuit, thereby achieving the effect of quickly connecting the circuit, and the circuit recovery operation is simple and the recovery efficiency is high.

[0051] It should be understood that the connector 620 includes: an upper connector 621, which is connected to the fuse section 610; a tension spring 622, whose upper end is connected to the upper connector 621; a lower connector 623, which is connected to the lower end of the tension spring 622, and the lower connector 623 is connected to the connecting section 630; a bridging guide rope 624, one end of which is connected to the upper connector 621 and the other end is connected to the lower connector 623, and the length of the bridging guide rope 624 is greater than the length of the tension spring 622, so as to ensure that the fuse 600 connected to the circuit can remain in a tensioned state.

[0052] Among them, the length of the bridging wire 624 is greater than the length of the tension spring 622, so that the bridging wire 624 is in a relaxed state, and a bridging conductor is connected between the upper connector 621 and the lower connector 623 to short-circuit the tension spring 622 through the bridging wire 624, thereby preventing a large current from passing through the tension spring 622 after the fuse 500 is closed and affecting the normal operation of the tension spring 622.

[0053] Combination Figure 6As for the ejector 400, which is a commonly used pop-up switch, the usual structure is: it includes an eject shell 410, in which an eject piston rod 420 is adapted, and a push block is arranged at one end of the eject piston rod 420 facing the fuse tube 500, and the side of the push block facing the fuse tube 500 is usually arc-shaped or V-shaped, and at the same time, a eject spring 430 is arranged on the side of the eject piston rod 420 away from the push block, and the eject spring 430 is used to provide ejection power and is compressed during the closing process of the fuse tube 500.

[0054] In summary, the drop-out fuse provided in this embodiment includes an insulator 100, an upper arm 200, a lower arm 300, a pop-up device 400, a fuse tube 500 and a fuse 600. The upper arm 200 and the lower arm 300 are arranged on the same side and are arranged at corresponding ends of the insulator 100. An elastic contact mechanism 210 is arranged on the upper arm 200, and a ratchet 310 and a pressure spring 320 are arranged on the lower arm 300. The ratchet 310 can slide up and down relative to the lower arm 300, and the pressure spring 320 is used to drive the ratchet 310 to slide up and down relative to the lower arm 300. 0 moves in a direction away from the upper arm 200, the ejector 400 is installed on the lower arm 300, the lower end of the fuse tube 500 is hinged to the lower arm 300, and the upper end can be engaged with the elastic card contact mechanism 210, and a ratchet 510 is fixed to the lower end of the fuse tube 500, the fuse 600 is penetrated in the fuse tube 500, one end is fixedly connected to the lower arm 300, and the other end can be engaged with the elastic card contact mechanism 210, and is transmission-connected with the ratchet 310; the fuse 600 includes a connected fuse section 610, a connector 620 and a connecting section 630.

[0055] During the closing process, the fuse 600 slides relative to the threading hole 311a. At this time, the tension pin wheel 340 contacts the inner wall of the fuse 600. As the fuse tube 500 rotates, the fuse 600 is pulled. The tension pin wheel 340 limits the fuse 600, forcing the fuse 600 to push the slide bar 311 upward, so that the fuse 600 is released by the upward movement of the slide bar 311, so as to compensate for the length of the fuse 600 and ensure that the fuse tube 500 can rotate smoothly, and drive the ratchet 310 to compress the pressing spring 320, so as to pass the fuse 600. 0 drives the pawl 310 to compress the top pressure spring 320 and move it to a state of cooperation with the ratchet 510, so that after the fuse tube 500 rotates to the corresponding fixed position, the cooperation between the ratchet 510 and the pawl 310 limits the fuse tube 500 to rotate (revolve) toward the end away from the insulator 100. At the same time, the reaction force of the ejector 400 being squeezed acts on the fuse tube 500 in real time, and then the rotation of the fuse tube 500 is limited through the cooperation between the ejector 400 and the ratchet 510 mechanism, so that the fuse tube 500 is stably maintained in the rotated state.

[0056] In addition, after the fuse tube 500 is closed, the upper end cooperates with the elastic latch mechanism 210 to limit the axial displacement of the fuse tube 500 through the top pressure directed to the lower support arm 300 applied by the tongue spring 212 of the elastic latch mechanism 210 and the supporting effect of the lower support arm. Therefore, through the cooperation of the ejector 400 and the ratchet 510 mechanism, the stability of the connection of the fuse tube 500 when closed can be ensured, so as to avoid the situation where the fuse tube 500 becomes loose and cannot work normally and the fuse 600 flashes when the drop-out fuse is operated in a high mountain canyon area. The fuse is suitable for power transmission lines in a high mountain canyon area.

[0057] When it is necessary to manually open the switch to disconnect the circuit, the pull ring 314 is pulled by the insulating operating rod. At this time, the connecting section 630 of the fuse 600 limits the slide bar 311, so that the toothed rod 312 is pulled downward relative to the slide bar 311 by the pull ring 314, thereby pulling the upper end of the toothed rod 312 away from the side wall of the ratchet 510 to release the restriction on the ratchet 510. At this time, the rebound force of the ejector 400 pushes the fuse tube 500 away from the insulator 100. In addition, the gravity of the fuse tube 500 itself causes the fuse tube 500 to rotate and fall around the hinge axis immediately after the fuse 600 is blown, thereby disconnecting the circuit and meeting the circuit breaking requirements during daily line maintenance and equipment repair.

[0058] After the fuse 600 blows, the squeezing force of the fuse 600 on the ratchet 510 disappears. At this time, the ratchet 310 is driven to reset under the action of the rebound force of the top pressure spring 320 to release the restriction on the ratchet 510, so that the fuse tube 500 can rotate away from the insulator 100, and the rebound force of the ejector 400 pushes the fuse tube 500 away from the insulator 100. In addition, due to the gravity of the fuse tube 500 itself, the fuse tube 500 immediately rotates around the hinge axis and falls after the fuse 600 blows, so that the circuit is disconnected, thereby cutting off the faulty section of the line or the faulty equipment.

[0059] When the fault is eliminated or the circuit is completed, after the switch is rotated again, the shortest of the remaining fuse sections 610 is tightened and connected to the circuit to achieve closing, without removing and reinstalling the fuse 600 from the circuit, thereby achieving the effect of quickly connecting the circuit, and the circuit recovery operation is simple and the recovery efficiency is high.

[0060] In summary, the drop-out fuse provided in this embodiment can ensure the stability of the connection of the fuse tube 500 when the circuit is closed, so as to avoid the situation where the fuse tube 500 becomes loose and cannot work normally and the fuse 600 flashes when the drop-out fuse is operating in a high mountain canyon area. It is suitable for power transmission lines in high mountain canyon areas and does not affect the rotation and drop of the fuse tube 500, thereby providing guarantee for the normal power transmission of the transmission lines, and has the characteristics of simple maintenance, high maintenance efficiency and low maintenance labor intensity.

[0061] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drop-out fuse, characterized in that: include: An insulator (100) is provided with a mounting support (110) in the middle; An upper support arm (200) is fixed to the upper end of the insulator (100) and is provided with an elastic locking mechanism (210); A lower support arm (300) is fixed at the lower end of the insulator (100) and is arranged on the same side as the upper support arm (200), and is provided with a ratchet (310) and a pressure spring (320), wherein the ratchet (310) can slide up and down relative to the lower support arm (300), and the pressure spring (320) is used to drive the ratchet (310) to move in a direction away from the upper support arm (200); A pop-up device (400) mounted on the lower support arm (300); A fusion tube (500), the lower end of which is hinged to the lower support arm (300), and the upper end of which can be engaged with the elastic engagement mechanism (210), and a ratchet (510) is fixed to the lower end of the fusion tube (500), and when the ratchet (510) cooperates with the pawl (310), the fusion tube (500) can be restricted from rotating toward an end away from the insulator (100); A fuse (600) is inserted into the melting tube (500), one end of which is fixedly connected to the lower support arm (300), and the other end of which can be engaged with the elastic engaging mechanism (210) and is drivingly connected to the ratchet (310); In the process of the melting tube (500) rotating toward the insulator (100), the fuse (600) is driven to tighten and squeeze the ejector (400), and the pawl (310) is driven by the fuse (600) to compress the top pressure spring (320) so that the pawl (310) is in a state of matching with the ratchet (510), and when the fuse (600) is blown, the top pressure spring (320) drives the pawl (310) to reset to release the restriction on the ratchet (510).

2. The drop-out fuse according to claim 1, characterized in that: The elastic contact mechanism (210) comprises a contact groove (211), the bottom of which is provided with a tongue spring (212), and the tongue spring (212) is capable of exerting a top pressure directed toward the lower support arm (300) on the melting tube (500).

3. The drop-out fuse according to claim 2, characterized in that: The tongue reed (212) comprises a connected guide section (212a) and a pressing section (212b), wherein the guide section (212a) is inclined from the bottom of the contact groove (211) toward the lower arm (300) and extends toward the insulator (100), and the pressing section (212b) is connected to the lower end of the guide section (212a).

4. The drop-out fuse according to claim 1, characterized in that: The lower support arm (300) is provided with a vertical sliding hole (330) and a tensioning pin wheel (340); the upper end of the vertical sliding hole (330) is provided with a first limiting portion (331), and the lower end is provided with a second limiting portion (332); the tensioning pin wheel (340) is located on the inner side of the fuse (600); the fuse (600) is passed through a side of the lower end of the fuse tube (500) away from the insulator (100); and when the fuse tube (500) rotates toward the insulator (100), the tensioning pin wheel (340) limits the position of the fuse (600) to tighten the fuse (600); The ratchet pawl (310) comprises a sliding rod (311) and a toothed rod (312); the sliding rod (311) is inserted into the vertical sliding hole (330), and the sliding rod (311) can slide along its own length direction; The slide bar (311) is provided with a threading hole (311a) and a top-pressing step (311b), the middle part of the fuse (600) is inserted into the threading hole (311a), the top-pressing spring (320) is sleeved on the middle part of the slide bar (311), and the top-pressing spring (320) is located between the first limiting portion (331) and the top-pressing step (311b), and the middle part of the slide bar (311) is limited in the vertical slide hole (330) through the cooperation between the top-pressing step (311b) and the second limiting portion (332); The gear rod (312) is slidably sleeved on the upper end of the slide rod (311), and the gear rod (312) can elastically expand and contract relative to the slide rod (311); When the fuse (600) drives the pawl (310) to compress the pressure spring (320) to a state where the pawl (310) cooperates with the ratchet (510), the upper end of the toothed rod (312) abuts against the side wall of the ratchet (510).

5. The drop-out fuse according to claim 4, characterized in that: The lower end of the gear rod (312) is slidably sleeved outside the upper end of the slide rod (311); The lower end of the gear rod (312) is provided with a third limiting portion (312a), and the upper end of the slide rod (311) is provided with a fourth limiting portion (311c), and the lower end of the gear rod (312) is limited on the slide rod (311) through the cooperation of the third limiting portion (312a) and the fourth limiting portion (311c); A telescopic spring (313) is provided inside the gear rod (312), and the telescopic spring (313) is located between the fourth limiting portion (311c) and the top of the inner cavity of the gear rod (312).

6. The drop-out fuse according to claim 5, characterized in that: The ratchet (310) further comprises a pull ring (314), and the pull ring (314) is located below the sliding rod (311); The pull ring (314) is transmission-connected to the toothed rod (312), and the fuse (600) drives the pawl (310) to compress the top pressure spring (320) to a state of matching with the ratchet (510). By pulling the pull ring (314), the upper end of the toothed rod (312) can be pulled away from the side wall of the ratchet (510) to release the restriction on the ratchet (510).

7. The drop-out fuse according to claim 6, characterized in that: A transmission hole (311d) is provided in the middle of the slide bar (311), and the transmission hole (311d) vertically penetrates the slide bar (311); A transmission pull rod (315) is inserted into the transmission hole (311d), one end of the transmission pull rod (315) is connected to the pull ring (314), and the other end is connected to the gear rod (312).

8. The drop-out fuse according to any one of claims 1 to 7, characterized in that: The fuse (600) comprises a connected fuse section (610), a connector (620) and a connecting section (630); the connecting section (630) is fixedly connected to the lower support arm (300) at one end and is drivingly connected to the pawl (310) in the middle; the fuse section (610) can be electrically connected to the elastic contact mechanism (210).

9. The drop-out fuse according to claim 8, characterized in that: A plurality of fuse sections (610) are provided, one end of each fuse section (610) is connected to the connector (620), and the other end of each fuse section (610) is connected to a moving contact (640), and the moving contact (640) can be electrically connected to the elastic contact mechanism (210); The moving contact (640) is arranged at one end of the melting tube (500) away from the lower support arm (300), and a plurality of the moving contacts (640) are arranged in sequence and at intervals along the rotation direction of the melting tube (500), and along the rotation direction of the melting tube (500), the lengths of the plurality of the fusible sections (610) are successively shortened; The connector (620) is capable of being retracted so that the connecting section (630) and the shortest fuse section (610) are kept in a tensioned state; When the fusion tube (500) is closed, only the moving contact (640) connected to the connection section (630) in a tensioned state is electrically connected to the elastic contact mechanism (210).

10. The drop-out fuse according to claim 9, characterized in that: The connector (620) comprises: An upper connector (621), the upper connector (621) being connected to the fuse section (610); A tension spring (622), the upper end of the tension spring (622) being connected to the upper connector (621); A lower connecting head (623), the lower connecting head (623) being connected to the lower end of the tension spring (622), and the lower connecting head (623) being connected to the connecting section (630); A bridging guide rope (624), one end of the bridging guide rope (624) is connected to the upper connecting head (621), and the other end is connected to the lower connecting head (623), and the length of the bridging guide rope (624) is greater than the length of the tension spring (622).

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