CN109921376B

CN109921376B - Automatic recovery type electric fuse

Info

Publication number: CN109921376B
Application number: CN201910277525.2A
Authority: CN
Inventors: 连碧真
Original assignee: Harbin Coslight Electric Automation Co ltd
Current assignee: HARBIN COSLIGHT ELECTRIC AUTOMATION Co.,Ltd.
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-12-22
Anticipated expiration: 2039-04-08
Also published as: CN109921376A

Abstract

The invention discloses an automatic recovery type electric fuse, which comprises a shell, wherein binding posts penetrate through the upper end and the side wall of the shell, mercury is arranged in the shell, the mercury submerges one ends of the two binding posts in the shell at normal temperature, a sliding cavity is arranged in the side wall of the shell, a sliding plug is connected in the sliding cavity in a sealing and sliding mode, a heat conducting plate is arranged between the inner bottom of the shell and the sliding cavity, low-boiling-point evaporation liquid is arranged at the left end of the sliding plug in the sliding cavity, and the right end of the sliding cavity is communicated with the shell through an air guide tube. The invention can lead mercury to be extruded into the elastic air bag through the two-way pressure valve by the evaporation of the low boiling point evaporation liquid when the current in the circuit is overlarge instantaneously, thereby cutting off the circuit, and lead the sliding plug to reset after the temperature is reduced, lead the mercury in the elastic air bag to enter the shell again, lead the binding post positioned at the upper end of the shell to be submerged in the mercury, and further lead the circuit to be conducted again.

Description

Automatic recovery type electric fuse

Technical Field

The invention relates to the technical field of fuses, in particular to an automatic recovery type power fuse.

Background

In an electric power system, a fuse is usually required to be arranged to prevent the electric power system from being damaged due to excessive current, and in actual life, short circuit and lightning strike of an electric appliance can cause instantaneous excessive current in the electric power system, so that a fuse wire in the fuse is blown due to overload.

For the current fuse type fuse, after the fuse wire is overloaded and fused, the fuse wire or the fuse tube needs to be replaced manually to recover the circuit, which causes great trouble to common residents.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides an automatic recovery type electric fuse which can enable mercury to be extruded into an elastic air bag through a two-way pressure valve through evaporation of low-boiling-point evaporation liquid when current in a circuit is excessively large instantaneously so as to cut off the circuit, and a sliding plug is reset after the temperature is reduced, so that the mercury in the elastic air bag enters a shell again, a binding post positioned at the upper end of the shell is submerged in the mercury, and the circuit is conducted again.

In order to achieve the purpose, the invention adopts the following technical scheme:

automatic recovery type electric power fuse, which comprises a housin, the upper end and the lateral wall of casing all run through and are equipped with the terminal, be equipped with mercury in the casing, mercury floods two at normal atmospheric temperature the terminal is located the one end of casing, set up smooth chamber in the lateral wall of casing, the sealed sliding connection of smooth intracavity has the sliding plug, be equipped with the heat-conducting plate between the interior bottom of casing and the sliding chamber, the left end portion that smooth chamber is located the sliding plug is equipped with low boiling evaporation liquid, the right-hand member of sliding chamber passes through air duct and casing intercommunication, the elasticity gasbag with the casing intercommunication is installed to the lateral wall of casing, and the intercommunication department of elasticity gasbag and casing installs two-way pressure valve.

Preferably, the casing is located the right side in smooth chamber and has seted up the device chamber, device intracavity sealing sliding connection has the slider, the elasticity gasbag sets up at the device intracavity, and the left end fixed connection of elasticity gasbag is on the lateral wall of slider, the inner wall of casing is equipped with a plurality of arc chambeies, and adjacent two arc chamber intercommunication, the arc chamber sets up along the circumference in smooth chamber, is located the arc chamber and the external intercommunication of leftmost end, is located the arc chamber and the device chamber intercommunication of rightmost end.

Preferably, after the low-boiling-point evaporant is heated and evaporated, the lower sliding plug is pushed by the low-boiling-point evaporant to move to the right limit end, and the binding post at the upper end is disconnected from the mercury.

Preferably, one end of the air guide pipe, which is positioned in the shell, is positioned above the mercury, and a semi-permeable membrane which only allows air to pass through is arranged at the air outlet.

The invention has the following beneficial effects:

1. the low boiling point evaporation liquid in the sliding cavity is heated to evaporate rapidly, so that the sliding plug is pushed to move rightwards, the sliding plug moves rightwards to press air in the sliding cavity into the shell, the air pressure in the shell is increased to extrude mercury into the elastic air bag through the two-way pressure valve, after the temperature is reduced, the sliding plug is reset, the mercury in the elastic air bag enters the shell again, the wiring terminal at the upper end of the shell is submerged in the mercury, and the circuit is conducted again;

2. the sliding plug can move rightwards under the drive of the elastic air bag 4 in the resetting process, the air pressure of the device cavity on the left side of the sliding block is reduced, and then the outside air enters the arc-shaped cavity, so that the cooling of the low-boiling-point evaporation liquid is accelerated, the fuse is accelerated to conduct a circuit, and the power-off time is shortened.

Drawings

Fig. 1 is a schematic structural diagram of an automatic recovery type power fuse according to the present invention;

fig. 2 is a schematic structural view of embodiment 2.

In the figure: the device comprises a shell 1, a binding post 2, mercury 3, an elastic air bag 4, a two-way pressure valve 5, a semipermeable membrane 6, an air duct 7, a heat conducting plate 8, a sliding plug 9, low-boiling-point evaporating liquid 10, an arc-shaped cavity 11, a device cavity 12 and a sliding block 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, the automatic recovery type electric fuse includes a casing 1, terminals 2 are respectively disposed on the upper end and the side wall of the casing 1, mercury 3 is disposed in the casing 1, the mercury 3 submerges one end of the two terminals 2 in the casing 1 at normal temperature, a sliding cavity is opened in the side wall of the casing 1, a sliding plug 9 is hermetically and slidably connected in the sliding cavity, a heat conducting plate 8 is disposed between the inner bottom of the casing 1 and the sliding cavity, a low boiling point evaporant 10 is disposed at the left end of the sliding plug 9 in the sliding cavity, after the low boiling point evaporant 10 is heated and evaporated, the sliding plug 9 moves to the right limit end under the push of the low boiling point evaporant 10, the terminal 2 at the upper end is disconnected from the mercury 3, the right end of the sliding cavity is communicated with the casing 1 through an air duct 7, one end of the air duct 7 in the casing 1 is located above the liquid level of the mercury, an elastic air bag 4 communicated with the shell 1 is installed on the side wall of the shell 1, and a two-way pressure valve 5 is installed at the communication position of the elastic air bag 4 and the shell 1.

In this embodiment, when the self-recovery power fuse is used, when the current of the circuit is too large, the mercury 3 as a conductor is heated rapidly, the low boiling point evaporation liquid in the sliding cavity is heated and evaporated rapidly, and then the sliding plug 9 is pushed to move rightwards, the sliding plug 9 moves rightwards to press the air in the sliding cavity into the shell 1, the air pressure in the shell 1 is increased to extrude the mercury 3 into the elastic air bag 4 through the two-way pressure valve 5, after the temperature is reduced, the sliding plug 9 is reset, the mercury 3 in the elastic air bag 4 enters the shell 1 again, the binding post 2 at the upper end of the shell 1 is submerged in the mercury 3, and then the circuit is switched on again.

After the low-boiling-point evaporative liquid 10 is cooled, the wiper plug 9 is returned to generate a negative pressure in the housing 1, thereby helping the mercury 3 in the elastic bladder 4 to return to the housing 1.

Example 2

Referring to fig. 2, what is different from embodiment 1 is that, device chamber 12 has been seted up on the right side that casing 1 is located smooth chamber, device chamber 12 internal seal sliding connection has slider 13, elasticity gasbag 4 sets up in device chamber 12, elasticity gasbag 4 can extend the inflation along the horizontal direction, and the left end fixed connection of elasticity gasbag 4 is on slider 13's lateral wall, casing 1's inner wall is equipped with a plurality of arc chambeies 11, and two adjacent arc chambeies 11 communicate, arc chamber 11 sets up along the circumference in smooth chamber, the arc chamber 11 that is located the leftmost end communicates with the external world, the arc chamber 11 that is located the rightmost end communicates with device chamber 12.

In this embodiment, the sliding plug 9 is at the in-process that resets, and slider 13 can move to the right under the drive of elasticity gasbag 4, and the device chamber 12 is located the left atmospheric pressure reduction of slider 13, and then makes the outside air enter into arc chamber 11 in, and then accelerates the cooling of low boiling point evaporant 10 for the fuse switches on the circuit, reduces the time of outage.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The automatic recovery type electric fuse comprises a shell (1) and is characterized in that binding posts (2) penetrate through the upper end and the side wall of the shell (1), mercury (3) is arranged in the shell (1), the mercury (3) submerges one end of the two binding posts (2) positioned in the shell (1) at normal temperature, a sliding cavity is arranged in the side wall of the shell (1), a sliding plug (9) is connected in the sliding cavity in a sealing and sliding way, a heat conducting plate (8) is arranged between the inner bottom of the shell (1) and the sliding cavity, the left end part of the sliding cavity, which is positioned at the sliding plug (9), is provided with low-boiling-point evaporating liquid (10), the right end of the sliding cavity is communicated with the shell (1) through an air duct (7), the side wall of the shell (1) is provided with an elastic air bag (4) communicated with the shell (1), and a two-way pressure valve (5) is arranged at the communication part of the elastic air bag (4) and the shell (1).

2. The automatic recovery type electric fuse recited in claim 1, wherein the housing (1) is provided with a device cavity (12) on the right side of the sliding cavity, the device cavity (12) is internally and slidably connected with a sliding block (13) in a sealing manner, the elastic airbag (4) is arranged in the device cavity (12), the left end of the elastic airbag (4) is fixedly connected to the side wall of the sliding block (13), the inner wall of the housing (1) is provided with a plurality of arc-shaped cavities (11), two adjacent arc-shaped cavities (11) are communicated, the arc-shaped cavities (11) are arranged along the circumferential direction of the sliding cavity, the arc-shaped cavity (11) at the leftmost end is communicated with the outside, and the arc-shaped cavity (11) at the rightmost end is communicated with the device cavity (12).

3. The self-recovery type electric fuse as claimed in claim 1, wherein the terminal (2) at the upper end is disconnected from the mercury (3) when a sliding plug (9) moves to the right limit end by the push of the low boiling point evaporated liquid (10) after the low boiling point evaporated liquid (10) is evaporated by heat.

4. An automatic recovery type electric fuse as claimed in claim 1, characterised in that the end of said gas-guiding tube (7) located inside the case (1) is located above the level of the mercury (3) and the gas outlet is provided with a semi-permeable membrane (6) allowing only the passage of air.