A drop-out fuse which is conveniently handled on the floor

Abstract

The application discloses a drop-out fuse convenient for ground operation, which comprises at least a fuse tube and a connector, the connector comprises a mounting base arranged on the right side of the fuse tube, a non-return device arranged on the mounting base, and an exit device arranged on the mounting base, and an operation space is formed around the non-return device and the exit device; the non-return device allows an operation rod to be inserted into the operation space in one direction and cannot be returned; and the exit device allows the operation rod to exit. The non-return mechanism comprises a hinged large arm, a reset device and a non-return small arm; and the exit device comprises an upper base, an exit rotating shaft and a torsion reset assembly.

Description

Technical Field

[0001] This application belongs to the field of electrical technology, specifically relating to a drop-out fuse that is easy to operate from the ground. Background Technology

[0002] Drop-out fuses are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. They are economical, easy to operate, and highly adaptable to outdoor environments. They are widely used on the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations.

[0003] However, existing fuse technology has the following problems: when the ground operator holds the slender operating rod, it is impossible for their hand to remain absolutely stable. At the top of the operating rod, due to the leverage effect, the small tremors of the hand are amplified into a large sway. Ordinary drop devices only have a small ring to connect the operating rod, but for drop devices installed at a high position, it is difficult for the ground operator to insert the operating rod into the ring smoothly in one go. Summary of the Invention

[0004] A drop-out fuse that is easy to operate on the ground includes at least a fuse tube and a connector. The connector includes a mounting base on the right side of the fuse tube, a check device on the mounting base, and a release device on the mounting base. An operating space is formed around the release device and the check device.

[0005] The check valve allows the operating lever to be inserted into the operating space in one direction and cannot be retracted;

[0006] The exit device allows the lever to exit.

[0007] As a further implementation plan:

[0008] The anti-return mechanism includes:

[0009] The articulated boom includes a boom base located in the lower half of the mounting base, a hinge chamber formed inside the boom base, hinge sockets formed on both sides of the hinge chamber, a boom spindle rotatably located in a pair of hinge sockets, a boom body formed at the upper end of the boom spindle, an enlarged end formed at the distal end of the boom body, an end slot formed in the enlarged end, and an end spindle formed in the end slot.

[0010] The reset device includes a spring base on the side of the boom body, a plate-shaped spring on the spring base and abutting against the mounting base, and a baffle on the right side of the boom base and abutting against the boom body.

[0011] The anti-return forearm includes a forearm body rotatably sleeved on the end spindle and a return torsion spring wound around the end spindle. One end of the return torsion spring is connected to the forearm body and the other end is connected to the end slot. The return torsion spring drives the forearm body to abut against the compression spring base.

[0012] As a further implementation plan:

[0013] Specifically, the withdrawal device includes an upper base, a rotatable withdrawal shaft disposed within the upper base, and a torsion reset assembly for driving the withdrawal shaft to rotate.

[0014] The upper foundation includes an inclined foundation that slopes from the upper left to the lower right, a rotating chamber located within the inclined foundation, a narrow-diameter lower hole formed at the lower end of the rotating chamber, an inner round shaft formed within the rotating chamber, an axial slide rail formed on the outer wall of the inner round shaft, and a vertical slot located on one side of the end of the axial slide rail.

[0015] The exit shaft includes a rotatable rotating sleeve fitted on an internal circular shaft, an upper retaining ring formed on the upper edge of the outer wall of the rotating sleeve, a compression spring wound around the rotating sleeve, and a snap-fit ​​plug formed on the inner wall of the rotating sleeve and engaged with a vertical slot. The upper end of the compression spring abuts against the upper retaining ring, and the lower end abuts against a narrow-diameter lower hole. The exit shaft also includes a C-shaped outer ring on the lower edge of the rotating sleeve and a guide arm formed on the lower edge of the C-shaped outer ring.

[0016] The torsion reset assembly includes an axial side hole formed along the outer wall of the rotating sleeve, a torsion ring groove formed in the inner wall of the narrow-diameter lower hole, a rotatable torsion sleeve disposed in the torsion ring groove, a torsion plug formed in the inner wall of the torsion sleeve and inserted into the axial side hole, and a torsion spring wound around the outer wall of the torsion sleeve, one end of the torsion spring being connected to the torsion sleeve and the other end being connected to the torsion ring groove.

[0017] As a further implementation plan:

[0018] More specifically, the upper end of the guide arm is also provided with an inclined end face that slopes from the lower left to the upper right.

[0019] As a further implementation plan:

[0020] The lower left side of the inclined foundation is also provided with a receiving slot for accommodating the forearm body.

[0021] As a more specific and further implementation plan:

[0022] The connector is made entirely of insulating material.

[0023] Beneficial effects:

[0024] The drop-out fuse described in this case is designed for convenient ground operation. Its connector allows ground personnel to operate it by holding a lever. A guide space with a narrow top and wide bottom is formed between the lower guide arm and the upper articulated arm. When the ground operator holds the slender lever, the lever is placed between the lower guide arm and the upper articulated arm from bottom to top and then lifted upwards. Even if the lever shakes, it will be constrained within the guide space by the lower guide arm and the upper articulated arm.

[0025] The check mechanism in this case can accommodate the upward sliding of the operating rod in one direction. After the operating rod enters the operating space, it can be used for closing and opening operations: the crossbar at the end of the operating rod is inserted through the gap between the guide arm and the check device; the crossbar presses the hinged upper arm upward, causing it to overcome the damping of the plate spring and rotate closer to the mounting base; while the lower end of the check arm rotates around the end mandrel, its upper end moves along the mounting base; the crossbar enters the operating space after passing the hinged upper arm.

[0026] The withdrawal device described in this case normally locks the operating lever to prevent it from retracting; after slightly twisting the operating lever, the withdrawal device can be unlocked, and pulling the withdrawal device downwards will retract the operating lever.

[0027] The operating lever and crossbar described in this case drive the exit shaft to rotate, and the snap-fit ​​plug slides into the axial slide rail from the vertical slot; then the operating lever and crossbar are pulled down, driving the exit shaft to move downward against the damping of the compression spring; until the distance between the C-shaped outer ring and the upper end of the hinged arm is large enough, the crossbar slides out from the gap between the lower end of the C-shaped outer ring and the upper end of the hinged arm. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of one embodiment of the drop-out fuse.

[0030] Figure 2 This is a schematic diagram of one embodiment of the connector.

[0031] Figure 3 yes Figure 2 An enlarged schematic diagram of one embodiment of part A.

[0032] Figure 4 This is a schematic diagram of one embodiment of the exit device.

[0033] Figure 5 This is a schematic diagram of one embodiment of the control lever.

[0034] Figure 6 This is a schematic diagram of another embodiment of the drop-out fuse.

[0035] Figure 7 This is a schematic diagram of one embodiment of the connector insertion state.

[0036] Figure 8 This is a schematic diagram of one embodiment of the connector's closed state.

[0037] Figure 9 This is a schematic diagram of one embodiment of the connector's open state.

[0038] Figure 10 This is a schematic diagram of one embodiment of the connector's out-of-state.

[0039] Figure 11 yes Figure 9 Enlarged schematic diagram of section B in the middle.

[0040] Figure 12 yes Figure 9 A schematic diagram of another embodiment is shown in section B.

[0041] Figure 13 yes Figure 9 A schematic diagram of another embodiment, enlarged from part B.

[0042] In the picture:

[0043] a. Fuse tube, b. Connector, m. Operating space;

[0044] 1. Install the foundation;

[0045] 2. Check valve mechanism;

[0046] 21. Articulated boom; 21a. Boom base; 21b. Articulated chamber; 21c. Articulated socket; 21d. Boom spindle; 21e. Boom body; 21f. Expanded end; 21g. End slot; 21h. End spindle.

[0047] 22. Reset device; 22a. Compression spring base; 22b. Plate-shaped compression spring; 22c. Baffle;

[0048] 23. Check arm; 23a. Arm body; 23b. Return torsion spring;

[0049] 3. Disengage the device;

[0050] 31. Upper foundation; 31a. Inclined foundation; 31b. Rotating chamber; 31c. Narrow-diameter lower hole; 31d. Internal round shaft; 31e. Axial slide; 31f. Vertical slot;

[0051] 32. Retract the pivot; 32a. Rotate the sleeve; 32b. Upper retaining ring; 32c. Compression spring; 32d. Snap-fit ​​plug; 32e. C-shaped outer ring; 32f. Guide lower arm;

[0052] 33. Torsion reset assembly, 33a. Axial side hole, 33b. Torsion ring groove, 33c. Torsion sleeve, 33d. Torsion plug, 33e. Torsion spring;

[0053] 4. Operating lever, 41. Crossbar, 42. Stop. Detailed Implementation

[0054] A drop-out fuse that is easy to operate on the ground includes at least a fuse tube a and a connector b, characterized in that: the connector b includes a mounting base 1 located on the right side of the fuse tube a, a check device 2 located on the mounting base 1, and a withdrawal device 3 located on the mounting base 1, wherein an operating space m is formed around the withdrawal device 3 and the check device 2.

[0055] The anti-return device 2 allows the operating lever to be inserted into the operating space m in one direction and cannot be withdrawn;

[0056] The exit device 3 allows the operating lever to exit.

[0057] As a further implementation plan:

[0058] The check mechanism 2 includes:

[0059] The articulated boom 21 includes a boom base 21a located in the lower half of the mounting base 1, a hinge chamber 21b formed inside the boom base 21a, hinge sockets 21c formed on both sides of the hinge chamber 21b, a boom spindle 21d rotatably disposed in a pair of hinge sockets 21c, a boom body 21e formed at the upper end of the boom spindle 21d, an enlarged end portion 21f formed at the distal end of the boom body 21e, an end slot 21g formed in the enlarged end portion 21f, and an end spindle 21h formed in the end slot 21g.

[0060] The reset device 22 includes a spring base 22a disposed on the side of the boom body 21e, a plate spring 22b disposed on the spring base 22a and abutting against the mounting base 1, and a baffle 22c disposed on the right side of the boom base 21a and abutting against the boom body 21e.

[0061] The anti-return forearm 23 includes a forearm body 23a rotatably sleeved on the end spindle 21h and a return torsion spring 23b wound around the end spindle 21h. One end of the return torsion spring 23b is connected to the forearm body 23a and the other end is connected to the end slot 21g. The return torsion spring 23b drives the forearm body 23a to abut against the compression spring base 22a.

[0062] 3. A drop-out fuse for convenient ground operation according to claim 2, characterized in that:

[0063] The withdrawal device 3 includes an upper base 31, a rotatable withdrawal shaft 32 disposed within the upper base 31, and a torsion reset assembly 33 for driving the withdrawal shaft 32 to rotate.

[0064] The upper foundation 31 includes an inclined foundation 31a that slopes from the upper left to the lower right, a rotating chamber 31b disposed in the inclined foundation 31a, a narrow-diameter lower hole 31c formed at the lower end of the rotating chamber 31b, an inner round shaft 31d formed in the rotating chamber 31b, an axial slide rail 31e formed on the outer wall of the inner round shaft 31d, and a vertical slot 31f vertically disposed on one side of the end of the axial slide rail 31e.

[0065] The exit shaft 32 includes a rotatable rotating sleeve 32a sleeved on an inner round shaft 31d, an upper retaining ring 32b formed on the upper edge of the outer wall of the rotating sleeve 32a, a compression spring 32c wound around the rotating sleeve 32a, and a snap-fit ​​plug 32d formed on the inner wall of the rotating sleeve 32a and inserted into the vertical slot 31f. The upper end of the compression spring 32c abuts against the upper retaining ring 32b, and the lower end abuts against the narrow-diameter lower hole 31c. The exit shaft 32 also includes a C-shaped outer ring 32e provided on the lower edge of the rotating sleeve 32a and a guide lower arm 32f formed on the lower edge of the C-shaped outer ring 32e.

[0066] The torsion reset assembly 33 includes an axial side hole 33a formed along the outer wall of the rotating sleeve 32a, a torsion ring groove 33b formed in the inner wall of the narrow-diameter lower hole 31c, a torsion sleeve 33c rotatably disposed in the torsion ring groove 33b, a torsion plug 33d formed in the inner wall of the torsion sleeve 33c and inserted into the axial side hole 33a, and a torsion spring 33e wound around the outer wall of the torsion sleeve 33c, one end of the torsion spring 33e being connected to the torsion sleeve 33c and the other end being connected to the torsion ring groove 33b.

[0067] As a further implementation plan:

[0068] The upper end of the guide arm 32f is also provided with an inclined end face 32g that slopes from the lower left to the upper right.

[0069] As a further implementation plan:

[0070] The lower left side of the inclined foundation 31a is also provided with a receiving slot 31g for accommodating the forearm body 23a.

[0071] As a further implementation plan:

[0072] The connector b is made entirely of insulating material.

[0073] This case also discloses a method for operating a ground-operated drop-out fuse, including the following steps:

[0074] Step 1, Insert:

[0075] Insert the crossbar 41 at the end of the operating lever 4 through the gap between the guide lower arm 32f and the check device 2;

[0076] The crossbar 41 presses the hinged arm 21 upward to make it overcome the damping of the plate spring 22b and rotate closer to the mounting base 1. At the same time, the lower end of the check arm 23 rotates around the end spindle 21h while its upper end moves upward along the mounting base 1.

[0077] The crossbar 41 passes over the hinged arm 21 and enters the operating space m;

[0078] The plate-shaped compression spring 22b drives the hinged arm 21 to reset, and the upper end of the hinged arm 21 abuts against the baffle 22c;

[0079] The reset torsion spring 23b drives the check arm 23 to reset, and the check arm 23 abuts against the compression spring base 22a;

[0080] Step 2, close or open the circuit breaker:

[0081] Pushing the operating lever 4 drives the crossbar 41, which in turn resets connector b and fuse tube a.

[0082] Step 3, Exit:

[0083] Twisting the operating lever 4 and the crossbar 41 causes the exit shaft 32 to rotate, and the snap-fit ​​plug 32d slides from the vertical slot 31f into the axial slide rail 31e;

[0084] Then pull down the operating lever 4 and the horizontal bar 41, which will drive the exit shaft 32 to move downward against the damping of the compression spring 32c;

[0085] The crossbar 41 slides out from the gap between the lower end of the C-shaped outer ring 32e and the upper end of the hinged arm 21 when the distance between them is large enough.

Claims

1. A drop-out fuse for convenient ground operation, comprising at least a fuse tube (a) and a connector (b), characterized in that: The connector (b) includes a mounting base (1) on the right side of the fuse tube (a), a check device (2) on the mounting base (1), and a withdrawal device (3) on the mounting base (1), with an operating space (m) formed around the withdrawal device (3) and the check device (2). The check valve (2) allows the operating lever to be inserted into the operating space (m) in one direction and cannot be retracted; The exit device (3) allows the operating lever to exit; The check device (2) includes: The articulated boom (21) includes a boom base (21a) located in the lower half of the mounting base (1), a hinge chamber (21b) formed inside the boom base (21a), hinge sockets (21c) formed on both sides of the hinge chamber (21b), a boom spindle (21d) rotatably located in a pair of hinge sockets (21c), a boom body (21e) formed at the upper end of the boom spindle (21d), an enlarged end (21f) formed at the far end of the boom body (21e), an end slot (21g) formed in the enlarged end (21f), and an end spindle (21h) formed in the end slot (21g). The reset device (22) includes a spring base (22a) on the side of the boom body (21e), a plate spring (22b) on the spring base (22a) and abutting against the mounting base (1), and a baffle (22c) on the right side of the boom base (21a) and abutting against the boom body (21e). The check arm (23) includes a forearm body (23a) rotatably sleeved on the end spindle (21h) and a return torsion spring (23b) wound around the end spindle (21h). One end of the return torsion spring (23b) is connected to the forearm body (23a) and the other end is connected to the end slot (21g). The return torsion spring (23b) drives the forearm body (23a) to abut against the compression spring base (22a). The exit device (3) includes an upper base (31), an exit shaft (32) rotatably disposed in the upper base (31), and a torsion reset assembly (33) for driving the exit shaft (32) to rotate. The upper foundation (31) includes an inclined foundation (31a) that slopes from the upper left to the lower right, a rotating chamber (31b) located in the inclined foundation (31a), a narrow-diameter lower hole (31c) formed at the lower end of the rotating chamber (31b), an inner round shaft (31d) formed in the rotating chamber (31b), an axial slide (31e) formed on the outer wall of the inner round shaft (31d), and a vertical slot (31f) vertically located on one side of the end of the axial slide (31e). The exit shaft (32) includes a rotatable rotating sleeve (32a) sleeved on the inner round shaft (31d), an upper retaining ring (32b) formed on the upper edge of the outer wall of the rotating sleeve (32a), a compression spring (32c) wound around the rotating sleeve (32a), and a snap-fit ​​plug (32d) formed on the inner wall of the rotating sleeve (32a) and inserted into the vertical slot (31f). The upper end of the compression spring (32c) abuts against the upper retaining ring (32b), and the lower end abuts against the narrow-diameter lower hole (31c). The exit shaft (32) also includes a C-shaped outer ring (32e) provided on the lower edge of the rotating sleeve (32a) and a guide lower arm (32f) formed on the lower edge of the C-shaped outer ring (32e). The torsion reset assembly (33) includes an axial side hole (33a) formed along the axial direction on the outer wall of the rotating sleeve (32a), a torsion ring groove (33b) formed on the inner wall of the narrow diameter lower hole (31c), a torsion sleeve (33c) rotatably disposed in the torsion ring groove (33b), a torsion plug (33d) formed on the inner wall of the torsion sleeve (33c) and inserted into the axial side hole (33a), and a torsion spring (33e) wound around the outer wall of the torsion sleeve (33c). One end of the torsion spring (33e) is connected to the torsion sleeve (33c) and the other end is connected to the torsion ring groove (33b).

2. The drop-out fuse for convenient ground operation according to claim 1, characterized in that: The upper end of the guide arm (32f) is also provided with an inclined end face (32g) that slopes from the lower left to the upper right.

3. A drop-out fuse for convenient ground operation according to claim 2, characterized in that: The lower left side of the inclined foundation (31a) is also provided with a receiving slot (31g) for receiving the forearm body (23a).

4. A drop-out fuse for convenient ground operation according to claim 3, characterized in that: The connector (b) is made entirely of insulating material.

5. An operating method based on the drop-out fuse according to any one of claims 1-4, characterized in that: Includes the following steps: Step 1, Insert: Insert the crossbar (41) at the end of the operating lever (4) through the gap between the guide arm (32f) and the check device (2); The crossbar (41) presses the hinged arm (21) upward to overcome the damping of the plate spring (22b) and rotates closer to the mounting base (1). At the same time, the lower end of the check arm (23) rotates around the end spindle (21h) while its upper end moves upward along the mounting base (1). The crossbar (41) passes over the articulated arm (21) and enters the operating space (m); The plate spring (22b) drives the hinged arm (21) to return to its original position, and the upper end of the hinged arm (21) abuts against the baffle (22c); The reset torsion spring (23b) drives the check arm (23) to reset, and the check arm (23) abuts against the compression spring base (22a); Step 2, close or open the circuit breaker: Pushing the operating lever (4) drives the crossbar (41) to reset the connector (b) and fuse tube (a); Step 3, Exit: Twist the operating lever (4) and the crossbar (41) to drive the exit shaft (32) to rotate, and the snap-fit ​​plug (32d) slides from the vertical slot (31f) into the axial slide (31e); Then pull down the operating lever (4) and the crossbar (41) to drive the exit shaft (32) to overcome the damping of the compression spring (32c) and move downward; The crossbar (41) slides out from the gap between the lower end of the C-shaped outer ring (32e) and the upper end of the hinged arm (21) when the distance between the outer ring (32e) and the upper end of the hinged arm (21) is large enough.

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