Drop-out fuse with safety limiting device

Abstract

The utility model discloses a drop-out fuse with a safety limiting device, which relates to the technical field of drop-out fuses and comprises a lower frame group, an upper frame group, an insulator group connected between the lower frame group and the upper frame group and a fusion tube. A limiting group is mounted on the lower frame group; and the limiting group comprises a fixed plate arranged on the lower frame group, an abutting part which is rotatably connected to the fixed plate and is used for being in contact with the end part of the fusion tube, and a buffer part which is arranged on the fixed plate and is connected with the back part of the abutting part, so that the fusion tube slowly falls when falling, and the swinging stroke of the fusion tube is limited. According to the utility model, by realizing the buffering and limiting control in the falling process of the fusion tube, the falling impact force of the fusion tube can be effectively reduced, the defects caused by the large swinging stroke of the fusion tube are avoided, the fracture accident caused by the traditional rigid collision is avoided, and the operation reliability is obviously improved while the cost advantage is maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drop-out fuse, specifically to a drop-out fuse with safety limiting device. BACKGROUND

[0002] As an important protection device in power distribution network, the working principle of drop-out fuse is that when short circuit or overload occurs in the line, the fuse melts to make the fuse tube lose tension, and under the action of gravity, the fuse tube falls around the fixed shaft to form visible fracture to isolate the fault.

[0003] The traditional drop-out fuse usually adopts single-end fixed structure, the fuse tube is installed on the lower frame group through the bottom rotation, and the top is connected with the upper frame group through the contact. When the fuse melts, the fuse tube freely falls around the lower frame group, and the traditional drop-out fuse does not set mechanical limiting structure at the bottom, and the fuse tube only relies on gravity to swing after falling. In actual operation, the swing stroke of the fuse tube is large, which leads to the following problems:

[0004] The fuse tube collides with adjacent equipment (such as porcelain insulator of other fuse or cable terminal head), which causes porcelain damage or discharge gap shortening; if the fuse tube contacts other conductive parts during falling, arc reignition or equipment ablation may be caused. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problems in the background art, and further provides a drop-out fuse with safety limiting device.

[0006] The utility model solves the technical problems by adopting the technical scheme:

[0007] A drop-out fuse with safety limiting device, which comprises a lower frame group, an upper frame group, an insulator group and a fuse tube connected to the lower frame group and the upper frame group; a limiting group is installed on the lower frame group; the limiting group comprises a fixed plate arranged on the lower frame group, a contact resisting part rotatably connected to the fixed plate and used for contacting the end part of the fuse tube, and a buffer part arranged on the fixed plate and connected with the back part of the contact resisting part, so that the fuse tube slowly falls when falling, and the swing stroke is limited.

[0008] In the above scheme, the swing stroke of the fuse tube is 120-150°.

[0009] In the above scheme, the contact resisting part comprises a contact plate rotatably arranged on the fixed plate, and a bottom support arranged at the front part of the contact plate and used for contacting the end part of the fuse tube.

[0010] In the above scheme, the bottom support is made of rubber material.

[0011] In the above scheme, the contact surface of the bottom support and the fuse tube is a solitary surface.

[0012] Further, the buffer part comprises a mounting plate arranged on the fixing plate, a guide rod horizontally slidingly arranged on the mounting plate, a limiting seat arranged at the tail end of the guide rod, a blocking seat arranged at the front end of the guide rod and in contact with the back of the touch plate, and a spring arranged between the blocking seat and the mounting plate and sleeved outside the guide rod.

[0013] Further, the blocking seat is in a spherical structure.

[0014] Further, the guide rod is a threaded rod, and the limiting seat is a nut.

[0015] Further, the limiting group further comprises a guide part horizontally arranged on the mounting plate, and the guide rod is inserted into the guide part.

[0016] Further, the guide part comprises a guide tube horizontally arranged on the mounting plate, and a plurality of balls arranged in the guide tube, and the plurality of balls form a rolling channel in the guide tube, and the guide rod is inserted into the rolling channel.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The utility model discloses a limiting group is additionally arranged on the lower frame group, and through the cooperation of the abutting part and the buffer part, buffer limiting control during the falling process of the melting pipe is realized, the falling impact of the melting pipe can be effectively reduced, the problem of the large swing stroke of the melting pipe is avoided, the rupture accident caused by the traditional rigid collision is avoided, the operation reliability is obviously improved while the cost advantage is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model;

[0020] Figure 2 It is the structural schematic diagram of the utility model; Figure 1 It is the local enlarged schematic diagram of A;

[0021] Figure 3 It is the installation position schematic diagram of the guide part;

[0022] Figure 4 It is the structural schematic diagram of the guide part;

[0023] Wherein: 1, lower frame group;2, upper frame group;3, insulator group;4, melting pipe;5, limiting group;51, fixing plate;52, abutting part;521, touch plate;522, bottom support;53, buffer part;531, mounting plate;532, guide rod;533, limiting seat;534, blocking seat;535, spring;54, guide part;541, guide tube;542, ball. DETAILED DESCRIPTION

[0024] 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. The utility model will be further described in combination with the drawings and embodiments:

[0025] A drop-out fuse with a safety limiting device, referring to the drawings Figure 1 and Figure 2 , comprising a lower frame group 1, an upper frame group 2, an insulator group 3 connected to the lower frame group 1 and the upper frame group 2, and a fuse tube 4; wherein the specific structure and connection and installation mode of the lower frame group 1, the upper frame group 2, the insulator group 3 and the fuse tube 4 are known to those skilled in the art, and the present application will not be described in detail; the main improvement of the present application is that a limiting group 5 for buffering and limiting when the fuse tube 4 falls is installed on the lower frame group 1; specifically, the limiting group 5 comprises a fixed plate 51 provided on the lower frame group 1, a contact portion 52 rotatably connected to the fixed plate 51 and used for contacting the end portion of the fuse tube 4, and a buffer portion 53 provided on the fixed plate 51 and connected to the back of the contact portion 52, so that the fuse tube 4 falls slowly when it falls, and the swing stroke is limited.

[0026] In the specific implementation process of the present application, when the fuse tube 4 falls freely due to failure, the lower end portion first hits the front end of the contact portion 52, the contact portion 52 is impacted and rotates backward to compress the buffer portion 53, the rotation fulcrum of the contact portion 52 forms a lever structure to extend the buffer stroke, and the impact kinetic energy is converted into elastic potential energy, so that the fuse tube 4 falls slowly until the buffer portion 53 reaches the force limit, so that the swing stroke of the fuse tube 4 is 120-150°, and the fuse tube 4 no longer continues to fall, limiting the swing stroke.

[0027] In the above scheme, referring to the drawings Figure 2 , the contact portion 52 comprises a contact plate 521 rotatably provided on the fixed plate 51, and a bottom support 522 provided on the front portion of the contact plate 521 and used for contacting the end portion of the fuse tube 4; the contact plate 521 is rotatably connected to the fixed plate 51, forming a lever fulcrum, when the end portion of the fuse tube 4 hits the bottom support 522, the contact plate 521 rotates, and the impact is transmitted to the rear buffer portion 53.

[0028] Among them, the bottom support 522 is made of rubber material and has a contact surface with the melting pipe 4. The bottom support 522 is made of rubber material, has a high elastic modulus and damping characteristics, can absorb the instantaneous impact energy of the melting pipe 4 falling in the initial contact stage, and reduce the damage of rigid collision. The contact surface of the bottom support 522 and the melting pipe 4 is designed as a curved surface (such as a concave arc matched with the ball head of the end of the melting pipe 4), which not only guides the melting pipe 4 to fall along the predetermined trajectory, but also disperses the impact force by increasing the contact area, avoiding local stress concentration and causing the melting pipe 4 to break.

[0029] In the above scheme, referring to the accompanying Figure 2 As shown in the accompanying drawings, the buffer part 53 includes a mounting plate 531 provided on the fixed plate 51, a guide rod 532 horizontally slidingly provided on the mounting plate 531, a limiting seat 533 provided at the tail end of the guide rod 532, a blocking seat 534 provided at the front end of the guide rod 532 and in contact with the back of the touch plate 521, and a spring 535 provided between the blocking seat 534 and the mounting plate 531 and sleeved outside the guide rod 532. When the melting pipe 4 falls to make the touch plate 521 rotate, the back of the touch plate 521 pushes the blocking seat 534, and the blocking seat 534 further compresses the spring 535, finally achieving the purpose of buffering.

[0030] Among them, the blocking seat 534 is in a spherical structure; the blocking seat 534 in a spherical structure can realize good contact with the back of the touch plate 521 during the rotation of the touch plate 521, no matter at what angle and direction the touch plate 521 is impacted by the melting pipe 4, and the friction is small during relative movement, which helps to reduce the wear between the blocking seat 534 and the touch plate 521, prolong the service life of the two, and also makes the rotation of the touch plate 521 more smooth.

[0031] Among them, the guide rod 532 is a threaded rod, and the limiting seat 533 is a nut; by rotating the limiting seat 533 (nut), the position of the limiting seat 533 on the guide rod 532 (threaded rod) can be changed, thereby adjusting the distance between the limiting seat 533 and the mounting plate 531, and adjusting the maximum sliding stroke of the guide rod 532 (for example, when a larger buffer stroke is needed, the nut can be rotated away from the mounting plate 531 to increase the distance that the guide rod 532 can slide; on the contrary, if you want to reduce the buffer stroke, rotate the nut towards the mounting plate 531), to meet the use requirements of specific environment.

[0032] In addition, considering the sliding effect of the guide rod 532, for this purpose, referring to the accompanying Figure 3 and the accompanying Figure 4As shown, the limiting group 5 further comprises a guide part 54 horizontally arranged on the mounting plate 531, and the guide rod 532 is inserted into the guide part 54; specifically, the guide part 54 comprises a guide tube 541 horizontally arranged on the mounting plate 531, and a plurality of ball bearings 542 mounted inside the guide tube 541, and the plurality of ball bearings 542 form a rolling channel inside the guide tube 541, and the guide rod 532 is inserted into the rolling channel; when the guide rod 532 is inserted into the rolling channel, rolling friction is formed between the guide rod 532 and the ball bearings 542, and the rolling can greatly reduce the resistance when the guide rod 532 moves, and the wear between the guide rod 532 and the guide part 54 is also significantly reduced, thereby ensuring the long-term stable working performance of the buffer part 53.

[0033] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A drop-out fuse with safety limiting device, comprising a lower frame set (1), an upper frame set (2), an insulator set (3) connected to the lower frame set (1) and the upper frame set (2), and a fuse tube (4); characterized in that: a limiting set (5) is installed on the lower frame set (1); the limiting set (5) comprises a fixed plate (51) arranged on the lower frame set (1), a contact portion (52) rotatably connected to the fixed plate (51) and used for contacting the end of the fuse tube (4), and a buffer portion (53) arranged on the fixed plate (51) and contacting the back of the contact portion (52), so that the fuse tube (4) falls slowly when falling, and the swing stroke thereof is limited.

2. The drop-out fuse with safety limiting device according to claim 1, characterized in that: the swing stroke of the fuse tube (4) is 120-150°.

3. The drop-out fuse with safety limiting device according to claim 2, characterized in that: the contact portion (52) comprises a contact plate (521) rotatably arranged on the fixed plate (51), and a bottom support (522) arranged at the front of the contact plate (521) and used for contacting the end of the fuse tube (4).

4. The drop-out fuse with safety limiting device according to claim 3, characterized in that: the bottom support (522) is made of rubber.

5. The drop-out fuse with safety limiting device according to claim 4, characterized in that: the contact surface between the bottom support (522) and the fuse tube (4) is a solitary surface.

6. The drop-out fuse with safety limiting device according to claim 5, characterized in that: the buffer portion (53) comprises a mounting plate (531) arranged on the fixed plate (51), a guide rod (532) horizontally slidably arranged on the mounting plate (531), a limiting seat (533) arranged at the tail end of the guide rod (532), a blocking seat (534) arranged at the front end of the guide rod (532) and contacting the back of the contact plate (521), and a spring (535) arranged between the blocking seat (534) and the mounting plate (531) and sleeved on the outside of the guide rod (532).

7. The drop-out fuse with safety limiting device according to claim 6, characterized in that: the blocking seat (534) is in a spherical structure.

8. The drop-out fuse with safety limiting device according to claim 7, characterized in that: the guide rod (532) is a threaded rod, and the limiting seat (533) is a nut.

9. The drop-out fuse with safety limiting device according to claim 8, characterized in that: the limiting set (5) further comprises a guide portion (54) horizontally arranged on the mounting plate (531), and the guide rod (532) is inserted into the guide portion (54).

10. The drop-out fuse with safety limiting device according to claim 9, characterized in that: The guide part (54) comprises a guide pipe (541) arranged horizontally on the mounting plate (531) and a plurality of rolling balls (542) mounted inside the guide pipe (541), and the rolling balls (542) form a rolling channel inside the guide pipe (541), and the guide rod (532) is inserted into the rolling channel.

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