Drop-out current-limiting fuse

Abstract

The utility model discloses a drop type current-limiting fuse, which relates to the field of fuse devices and comprises a high-strength insulator, a fuse tube is mounted on one side of the high-strength insulator, a fixed mounting plate is fixedly connected to the surface of the high-strength insulator, an upper wiring terminal and a lug are fixedly connected to the surface of the high-strength insulator, and the upper wiring terminal and the lug are fixedly connected to the surface of the high-strength insulator. The inner wall of the lug seat is fixedly connected with a lower end contact, and the surface of the lower end contact is fixedly connected with a lower wiring terminal. According to the utility model, the metal wire is melted by high temperature of current, the limitation of the bottom end of the fuse tube is released, the stress plate is quickly reset through the spring and drives the seesaw which is in fit contact with the stress plate, so that the whole fuse tube rotates by an angle by taking the rotating shaft as a center, and further the contact head which is originally clamped in the clamping groove at the top end of the fuse tube is quickly separated from the clamping groove. At the moment, the metal clamp is stressed to deform, one end of the opening is opened for space avoidance, and then the fuse tube rapidly falls off and is separated.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuse device field, especially involves a drop type current -limiting fuse. BACKGROUND

[0002] Drop type fuse is 10kV distribution conductor line branch and distribution transformer most commonly used one kind of short circuit protection switch, it has economic, convenient operation, strong environmental adaptability etc.

[0003] The top end of the existing fuse fuse tube is limited by the duck cap pressing mode, which can cause arc phenomenon when the line has short circuit fault, cannot quickly drop down, forms the intermittent break, makes the arc extinguish quickly, and the protection is not timely, so a drop type current -limiting fuse is needed. UTILITY MODEL CONTENTS

[0004] The utility model discloses a drop type current -limiting fuse to solve the problem in the background art.

[0005] In order to achieve the above object, the utility model provides the following technical scheme: a drop type current -limiting fuse, including high -strength insulator, one side of high -strength insulator is installed with fuse tube, the surface fixed connection of high -strength insulator has fixed mounting plate, the surface fixed connection of high -strength insulator has upper terminal and ear seat, the inner wall fixed connection of ear seat has lower end contact, the surface fixed connection of lower end contact has lower terminal, the surface installation of fuse tube has quick drop mechanism.

[0006] Preferably, the quick drop mechanism includes a contact plate fixedly connected to the surface of the fuse tube, the inner wall of the contact plate is fixedly connected with a fuse cylinder of the fuse tube, and a groove is formed in the surface of the lower end contact.

[0007] Preferably, the inner wall of the fuse cylinder is provided with a metal wire, the surface of the metal wire is in contact with the inner wall of the groove, the surface of the contact plate is fixedly connected with a rotating shaft, and one end of the rotating shaft is rotatably connected with the surface of the ear seat.

[0008] Preferably, the surface of the contact plate is fixedly connected with a hinged plate, the upper surface of the lower end contact is fixedly connected with a fixed plate, the upper surface of the fixed plate is fixedly connected with an arc-shaped telescopic rod, and the top end of the arc-shaped telescopic rod is fixedly connected with a stress plate.

[0009] Preferably, the surface of the arc-shaped telescopic rod is sleeved with a spring, the surface of the stress plate is in contact with the surface of the warped plate, the surface of the upper terminal is fixedly connected with a metal clamp, and the surface of the metal clamp is fixedly connected with an arc-shaped mounting plate.

[0010] Preferably, the surface of the fuse tube is fixedly connected with a contact head and an operating ring, the surface of the metal clamp is provided with a clamping groove, the surface of the contact head is in contact with the inner wall of the clamping groove, and the metal clamp has toughness.

[0011] In conclusion, the technical effects and advantages of the utility model are as follows:

[0012] In the utility model, when a short circuit occurs in a circuit, the metal wire is melted by high temperature of current, the limitation of the bottom end of the fuse tube is removed, the stress plate is quickly reset through the spring, the stress of the contact warped plate is driven, the fuse tube as a whole is rotated around the rotating shaft, the angle is rotated, and then the contact head originally clamped in the clamping groove at the top end of the fuse tube is quickly separated from the clamping groove, at this time, the metal clamp is deformed and opened at one end of the stress deformation opening to avoid space, and then the fuse tube is quickly dropped and separated. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0014] Figure 1 It is a three-dimensional structure schematic view of the embodiment of the utility model;

[0015] Figure 2 It is a three-dimensional structure schematic view of the metal clamp in the embodiment of the utility model;

[0016] Figure 3 It is a three-dimensional structure schematic view of the high-strength insulator in the embodiment of the utility model;

[0017] Figure 4 It is the embodiment of the utility model Figure 3 It is an enlarged structure schematic view of position A in the embodiment of the utility model;

[0018] Figure 5 It is a three-dimensional structure schematic view of the metal wire in the embodiment of the utility model.

[0019] In the figure: 1, high-strength insulator; 2, fuse tube; 3, upper terminal; 4, arc-shaped mounting plate; 5, operating ring; 6, lower terminal; 7, metal clamp; 8, contact head; 9, fuse cylinder; 10, contact plate; 11, rotating shaft; 12, stress plate; 13, ear seat; 14, spring; 15, arc-shaped expansion rod; 16, lower end contact; 17, groove; 18, fixed plate; 19, metal wire; 20, clamping groove; 21, fixed mounting plate; 22, cantilever plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] Embodiment: Reference Figures 1-5 As shown in the figure, a drop type current limiting fuse includes a high-strength insulator 1, one side of the high-strength insulator 1 is provided with a fuse tube 2, the surface of the high-strength insulator 1 is fixedly connected with a fixed mounting plate 21, the surface of the high-strength insulator 1 is fixedly connected with an upper terminal 3 and an ear seat 13, the inner wall of the ear seat 13 is fixedly connected with a lower end contact 16, the surface of the lower end contact 16 is fixedly connected with a lower terminal 6, and the surface of the fuse tube 2 is provided with a rapid drop mechanism.

[0022] Through the above structure, the upper terminal 3 and the lower end contact 16 are arranged to conduct the connection and conduction operation, the fuse tube 2 is arranged to install the fuse cylinder 9, and the rapid drop mechanism is arranged to make the fuse tube 2 form an intermittent drop by fusing the metal wire 19.

[0023] Preferably, the rapid drop mechanism includes a contact plate 10 fixedly connected to the surface of the fuse tube 2, the contact plate 10 and the inner wall of the fuse tube 2 are fixedly connected with the same fuse cylinder 9, and the surface of the lower end contact 16 is provided with a groove 17.

[0024] The contact plate 10 is arranged to install the rotating shaft 11 and the cantilever plate 22, and the fuse cylinder 9 and the groove 17 are arranged to clamp the limiting metal wire 19.

[0025] Preferably, the inner wall of the fuse cylinder 9 is provided with the metal wire 19, the surface of the metal wire 19 is in contact with the inner wall of the groove 17, the surface of the contact plate 10 is fixedly connected with the rotating shaft 11, and one end of the rotating shaft 11 is rotatably connected with the surface of the ear seat 13.

[0026] When the metal wire 19 is broken by the short-circuit current, the limiting of the fuse tube 2 is quickly released, and the fuse tube 2 rotates around the rotating shaft 11 by setting the rotating shaft 11.

[0027] Preferably, the surface of the contact plate 10 is fixedly connected with the warped plate 22, the upper surface of the lower end contact 16 is fixedly connected with the fixed plate 18, the upper surface of the fixed plate 18 is fixedly connected with the arc-shaped expansion rod 15, and the top end of the arc-shaped expansion rod 15 is fixedly connected with the stress plate 12.

[0028] The fixed plate 18 is arranged to support the arc-shaped expansion rod 15, the arc-shaped expansion rod 15 is arranged to fix the stress plate 12, and the stress plate 12 is arranged to drive the stress warped plate 22 to reset.

[0029] Preferably, the surface of the arc-shaped expansion rod 15 is sleeved with the spring 14, the surface of the stress plate 12 is in contact with the surface of the warped plate 22, the surface of the upper wiring terminal 3 is fixedly connected with the metal clamp 7, and the surface of the metal clamp 7 is fixedly connected with the arc-shaped mounting plate 4.

[0030] The spring 14 is arranged to give the stress plate 12 a resetting pressure, and the arc-shaped mounting plate 4 is arranged to mount and fix the metal clamp 7 and the upper wiring terminal 3 as a whole.

[0031] Preferably, the surface of the fuse tube 2 is fixedly connected with the contact head 8 and the operating ring 5, the surface of the metal clamp 7 is provided with the clamping groove 20, the surface of the contact head 8 is in contact with the inner wall of the clamping groove 20, and the metal clamp 7 is flexible.

[0032] The contact head 8 is arranged to prevent it from being separated by cooperating with the clamping groove 20, and the operating ring 5 is arranged to enable an operator to separate the surface of the contact head 8 from the surface of the metal clamp 7 by means of a tool.

[0033] The working principle of the utility model is as follows: when a line is short-circuited, the current of the fuse tube 2 is transmitted to melt the metal wire 19 inserted into the fuse cylinder 9, so that the bottom end of the fuse tube 2 is unblocked, the stress plate 12 is stressed under the resetting potential energy of the spring 14, the warped plate 22 in contact with the stress plate 12 is stressed, the warped plate 22 and the fuse tube 2 as a whole rotate around the rotating shaft 11, the angle of the fuse tube 2 is rotated, the contact head 8 originally clamped in the clamping groove 20 is quickly separated from the clamping groove 20, one end of the metal clamp 7 stressed to deform is opened to avoid space, and then the fuse tube 2 is quickly dropped and separated, so that the fuse tube 2 is quickly separated and dropped in the above structure.

[0034] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A drop-out current limiting fuse comprising a high strength insulator (1) characterised in that: The high-strength insulator (1) is provided with a fuse tube (2) on one side, the surface of the high-strength insulator (1) is fixedly connected with a fixed mounting plate (21), the surface of the high-strength insulator (1) is fixedly connected with an upper terminal (3) and an ear seat (13), the inner wall of the ear seat (13) is fixedly connected with a lower end contact (16), the surface of the lower end contact (16) is fixedly connected with a lower terminal (6), and the surface of the fuse tube (2) is provided with a quick falling mechanism.

2. A drop-out current-limited fuse according to claim 1, characterized in that: The quick falling mechanism comprises a contact plate (10) fixedly connected to the surface of the fuse tube (2), the contact plate (10) and the inner wall of the fuse tube (2) are fixedly connected with a same fuse cylinder (9), and the surface of the lower end contact (16) is provided with a groove (17).

3. A drop-out current-limited fuse according to claim 2, characterized in that: The inner wall of the fuse cylinder (9) is provided with a metal wire (19), the surface of the metal wire (19) is in contact with the inner wall of the groove (17), the surface of the contact plate (10) is fixedly connected with a rotating shaft (11), and one end of the rotating shaft (11) is rotatably connected to the surface of the ear seat (13).

4. The drop-out current-limited fuse of claim 2, wherein: The surface of the contact plate (10) is fixedly connected with a warped plate (22), the upper surface of the lower end contact (16) is fixedly connected with a fixed plate (18), the upper surface of the fixed plate (18) is fixedly connected with an arc-shaped expansion rod (15), and the top end of the arc-shaped expansion rod (15) is fixedly connected with a stress plate (12).

5. A drop-out current-limited fuse according to claim 4, characterized in that: The surface of the arc-shaped expansion rod (15) is provided with a spring (14), the surface of the stress plate (12) is in contact with the surface of the warped plate (22), the surface of the upper terminal (3) is fixedly connected with a metal clamp (7), and the surface of the metal clamp (7) is fixedly connected with an arc-shaped mounting plate (4).

6. A drop-out current-limited fuse according to claim 5, characterized in that: The surface of the fuse tube (2) is fixedly connected with a contact head (8) and an operating ring (5), the surface of the metal clamp (7) is provided with a clamping groove (20), the surface of the contact head (8) is in contact with the inner wall of the clamping groove (20), and the metal clamp (7) has toughness.

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