Current-limiting protection device

Abstract

The utility model discloses a current-limiting protection device, which comprises a porcelain cover, two gaskets fixed on the porcelain cover and a moving contact fixed on the gaskets, each gasket is fixedly connected with a fastener, a fuse wire is detachably connected between the two fasteners, the middle part of the porcelain cover is provided with a sliding port, and the sliding port is provided with a sliding groove. A porcelain strip is inserted into the sliding opening in a sliding mode, an elastic assembly is arranged in the sliding opening, the upper end of the elastic assembly is connected with the porcelain strip, and a porcelain block is fixedly connected to the lower end of the elastic assembly. According to the utility model, when the current in the circuit exceeds a rated value, the fuse is fused, the circuit is cut off, and the current-limiting protection effect is achieved, at the moment, the elastic assembly drives the porcelain strip and the porcelain block to synchronously move upwards, and at the moment, a worker can see that the porcelain block completely enters the sliding opening, so that the reminding effect can be achieved; and a worker can conveniently, quickly and timely check out the damaged fuse.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical components, in particular to a current limiting protection device. Background Art

[0002] In a circuit, if the current exceeds the rated value designed during design, it will cause wires, equipment or components to overheat or even burn, thus causing safety problems such as fire. Current limiting protection devices are often used in the circuit design process, which plays an important role in the stable operation of electronic equipment.

[0003] A fuse is a device that uses the principle of melting to limit current. When the current in the circuit exceeds the rated value, the fuse inside the fuse will melt, cutting off the circuit and playing a role in current limiting protection. The existing fuse does not have a prompt function after cutting off the circuit, which makes it impossible for staff to quickly identify the damaged fuse, so it is urgent to solve the problem. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a current limiting protection device, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a current limiting protection device, including a porcelain cover, two gaskets fixed on the porcelain cover and a moving contact fixed on the gasket, each of the gaskets is fixedly connected with a fastener, a fuse is detachably connected between the two fasteners, a sliding opening is opened in the middle of the porcelain cover, a porcelain strip is slidably inserted inside the sliding opening, an elastic component is arranged inside the sliding opening, the upper end of the elastic component is connected to the porcelain strip, and the lower end of the elastic component is fixedly connected to a porcelain block, under the action of the elastic component, the top of the porcelain strip contacts with the fuse, when the current in the circuit exceeds the rated value, the fuse will blow, cutting off the circuit, playing the role of current limiting protection, at this time the elastic component drives the porcelain strip and the porcelain block to move up synchronously.

[0008] Preferably, the elastic component includes a positioning block fixed inside the sliding mouth and an insertion rod movably inserted in the positioning block, the upper and lower ends of the insertion rod are respectively fixedly connected to the porcelain strip and the porcelain block, and a spring is fixedly connected between the positioning block and the porcelain strip.

[0009] Preferably, the spring is sleeved on an insertion rod, and the insertion rod is cylindrical.

[0010] Preferably, limiting grooves are provided on both sides of the sliding opening, limiting blocks are fixedly connected on both sides of the porcelain strip, and the limiting blocks are slidably arranged in the limiting grooves.

[0011] Preferably, a stopper is provided at the bottom of the ceramic block through rotation of a rotating shaft, and the number of the stoppers is two.

[0012] Preferably, the stopper can rotate along the surface of the ceramic block, and when the end of the stopper rotates to the outside of the ceramic block, the end of the stopper abuts against the ceramic cover, thereby limiting the vertical position of the ceramic block.

[0013] (III) Beneficial effects

[0014] The utility model provides a current limiting protection device, which has the following beneficial effects:

[0015] 1. In the utility model, when the current in the circuit exceeds the rated value, the fuse will melt, cutting off the circuit and playing the role of current limiting protection. At this time, the elastic component drives the porcelain strip and the porcelain block to move up synchronously. At this time, the staff can see that the porcelain block is completely entered into the sliding mouth, which can serve as a reminder and facilitate the staff to quickly and timely find out the damaged fuse.

[0016] 2. In the utility model, the ceramic strip is first pressed to move the ceramic block out of the slide, and then the stopper is rotated to make the stopper contact with the surface of the ceramic cover to limit the vertical position of the ceramic block; then the fuse is connected to the fastener, and the fuse is installed intact and can be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front perspective structural diagram of a current limiting protection device proposed by the utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of a current limiting protection device proposed by the utility model;

[0019] Figure 3 for Figure 2 A magnified structural diagram;

[0020] Figure 4 This is a bottom view of the structure of a current limiting protection device proposed by the utility model;

[0021] Figure 5 for Figure 4 Enlarged structural diagram at point B.

[0022] In the figure: 1, porcelain cover; 101, sliding mouth; 102, limiting groove; 2, moving contact; 3, fuse; 4, fastener; 5, gasket; 6, porcelain strip; 7, elastic component; 71, positioning block; 72, spring; 73, plug rod; 8, limiting block; 9, porcelain block; 10, stop block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figures 1 to 5 The utility model provides a technical solution: a current limiting protection device, including a porcelain cover 1, two gaskets 5 fixed on the porcelain cover 1 and a moving contact 2 fixed on the gasket 5, each gasket 5 is fixedly connected with a fastener 4, and a fuse 3 is detachably connected between the two fasteners 4. Here, the fastener 4 is usually composed of a stud, a nut and two conductive rings. The fuse 3 is fixed between the two conductive rings, and the nut is screwed on the stud for locking, which is a prior art; a sliding opening 101 is opened in the middle of the porcelain cover 1, and a porcelain strip 6 is slidably inserted inside the sliding opening 101. An elastic component 7 is arranged inside the sliding opening 101. The upper end of the elastic component 7 is connected to the porcelain strip 6, and the lower end of the elastic component 7 is fixedly connected with a porcelain block 9. Under the action of the elastic component 7, the top of the porcelain strip 6 contacts with the fuse 3. When the current in the circuit exceeds the rated value, the fuse 3 will melt, cut off the circuit, and play a role in current limiting protection. At this time, the elastic component 7 drives the porcelain strip 6 and the porcelain block 9 to move up synchronously.

[0025] When the current in the circuit exceeds the rated value, the fuse 3 will blow, cutting off the circuit and playing the role of current limiting protection. At this time, the elastic component 7 drives the porcelain strip 6 and the porcelain block 9 to move up synchronously. At this time, the staff can see that the porcelain block 9 has completely entered the sliding opening 101. This can serve as a reminder, making it convenient for the staff to quickly and timely detect the damaged fuse.

[0026] In this embodiment, the elastic component 7 includes a positioning block 71 fixed inside the sliding mouth 101 and an insertion rod 73 movably inserted in the positioning block 71. The upper and lower ends of the insertion rod 73 are respectively fixedly connected to the porcelain strip 6 and the porcelain block 9. A spring 72 is fixedly connected between the positioning block 71 and the porcelain strip 6.

[0027] The spring 72 is sleeved on the insertion rod 73, and the insertion rod 73 is cylindrical.

[0028] After the fuse 3 is blown, the restriction on the porcelain strip 6 will be released. At this time, the spring 72 releases its elastic force, pushing the porcelain strip 6 upward, and the porcelain strip 6 pulls the porcelain block 9 into the sliding opening 101 through the insertion rod 73, which is convenient for staff to observe.

[0029] In addition, limiting grooves 102 are provided on both sides of the sliding opening 101, and limiting blocks 8 are fixedly connected on both sides of the ceramic strip 6. The limiting blocks 8 are slidably arranged in the limiting grooves 102 to achieve the purpose of guiding the ceramic strip 6 and maintain linear motion.

[0030] A stopper 10 is provided at the bottom of the ceramic block 9 for rotation via a rotating shaft, and the number of the stoppers 10 is two.

[0031] The stopper 10 can rotate along the surface of the ceramic block 9 . When the end of the stopper 10 rotates to the outside of the ceramic block 9 , the end of the stopper 10 abuts against the ceramic cover 1 , thereby limiting the vertical position of the ceramic block 9 .

[0032] When replacing the fuse 3, first press the porcelain strip 6 to move the porcelain block 9 out of the slide 101, and then rotate the stopper 10 to make the stopper 10 abut against the surface of the porcelain cover 1 to limit the vertical position of the porcelain block 9; then connect the fuse 3 to the fastener 4, install the fuse 3 that can be used normally, and make the fuse 3 abut against the top of the porcelain strip 6; when the installation is completed, rotate the stopper 10 again to separate the stopper 10 from the porcelain cover 1.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A current limiting protection device, characterized in that: The invention comprises a porcelain cover (1), two gaskets (5) fixed on the porcelain cover (1), and a moving contact (2) fixed on the gasket (5), each of the gaskets (5) being fixedly connected with a fastener (4), a fuse (3) being detachably connected between the two fasteners (4), a sliding opening (101) being provided in the middle of the porcelain cover (1), a porcelain strip (6) being slidably inserted inside the sliding opening (101), an elastic component (7) being provided inside the sliding opening (101), the upper end of the elastic component (7) being connected with the porcelain strip (6), the lower end of the elastic component (7) being fixedly connected with a porcelain block (9), under the action of the elastic component (7), the top of the porcelain strip (6) contacts with the fuse (3), when the current in the circuit exceeds the rated value, the fuse (3) will melt, cut off the circuit, and play a role of current limiting protection, at which time the elastic component (7) drives the porcelain strip (6) and the porcelain block (9) to move upward synchronously.

2. A current limiting protection device according to claim 1, characterized in that: The elastic component (7) comprises a positioning block (71) fixed inside the sliding opening (101), and an insertion rod (73) movably inserted into the positioning block (71); the upper and lower ends of the insertion rod (73) are respectively fixedly connected to the porcelain strip (6) and the porcelain block (9); and a spring (72) is fixedly connected between the positioning block (71) and the porcelain strip (6).

3. A current limiting protection device according to claim 2, characterized in that: The spring (72) is sleeved on the insertion rod (73), and the insertion rod (73) is cylindrical.

4. A current limiting protection device according to claim 1, characterized in that: Limiting grooves (102) are provided on both sides of the sliding opening (101), and limiting blocks (8) are fixedly connected to both sides of the ceramic strip (6), and the limiting blocks (8) are slidably arranged in the limiting grooves (102).

5. A current limiting protection device according to claim 1, characterized in that: A stopper (10) is provided at the bottom of the ceramic block (9) for rotation via a rotating shaft, and the number of the stoppers (10) is two.

6. A current limiting protection device according to claim 5, characterized in that: The stopper (10) can rotate along the surface of the ceramic block (9). When the end of the stopper (10) rotates to the outside of the ceramic block (9), the end of the stopper (10) abuts against the ceramic cover (1), thereby limiting the vertical position of the ceramic block (9).

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