阅读说明：本技术 一种二次送电的自复熔断器 (Secondary power transmission self-resetting fuse ) 是由 陈垠杰 于 2020-07-15 设计创作，主要内容包括：本发明涉及电气安全技术领域,且公开了一种二次送电的自复熔断器,包括壳体,所述壳体的两端均设有端电极,两个所述端电极之间依次设有熔断腔、蓄能活塞和气腔,所述蓄能活塞包括有第一柱塞和第二柱塞。该二次送电的自复熔断器,在第一次通过异常电流会快速熔断,并自行恢复,而在第二次通过异常电流时会使复位卡死,避免反复通断电的发生,其次由于顶杆的复位进行了延时设置,因此在预设时间内的第二次异常电流都会触发永久断电,提醒工作人员找出故障,通过蓄能腔吸收熔断腔气化时释放的势能,并在蓄能活塞复位时释放使其短暂断电,电力恢复过程经历了两次送电,下级线路的维修人员会在一次供电时得到预警并及时脱离接触。(The invention relates to the technical field of electrical safety, and discloses a secondary power transmission self-resetting fuse which comprises a shell, wherein end electrodes are arranged at two ends of the shell, a fusing cavity, an energy storage piston and an air cavity are sequentially arranged between the two end electrodes, and the energy storage piston comprises a first plunger and a second plunger. This secondary power transmission from fuse that restores to throne, can fuse fast through the abnormal current for the first time, and resume by oneself, and can make the card that resets die when the abnormal current is passed through for the second time, avoid the emergence of outage repeatedly, secondly because the time delay setting has been carried out in the restoration of ejector pin, consequently, the second time abnormal current in the time of predetermineeing can all trigger permanent outage, remind the staff to find out the trouble, absorb the potential energy of release when fusing chamber gasification through the energy storage chamber, and release when the energy storage piston resets and make its short-term outage, the electric power recovery process has experienced twice power transmission, the maintenance personal of subordinate's circuit can obtain the early warning and in time break away from the contact when a power supply.)

1. The utility model provides a secondary power transmission's fuse from restoring to throne, includes casing (1), the both ends of casing (1) all are equipped with end electrode (2), two be equipped with fusing chamber (3), energy storage piston (4) and air cavity (5), its characterized in that between end electrode (2) in proper order: the energy storage piston (4) comprises a first plunger (41) and a second plunger (42), the first plunger (41) and the second plunger (42) are detachably connected through a connecting piece (46), the first plunger (41) and the second plunger (42) are electrically connected through a first inner electrode (43) and a second inner electrode (44), an energy storage cavity (45) is arranged between the first plunger (41) and the second plunger (42), a communication valve (8) with controllable flow direction is arranged between the energy storage cavity (45) and an air cavity (5), the communication valve (8) controls air flow to flow from the air cavity (5) to the energy storage cavity (45) when expanding, the communication valve (8) is fully communicated after the connecting piece (46) is separated, a push rod (6) for triggering the connecting piece (46) to trip is arranged on the inner wall of the shell (1), and the push rod (6) is triggered when the energy storage piston (4) moves, and the connecting piece (46) is triggered to separate only when the energy storage piston (4) is reset, the ejector rod (6) is provided with a time delay piece (7) for delaying the resetting of the ejector rod (6), and the energy storage piston (4) is reset for the second time when the ejector rod (6) is in an extending state.

2. The self-resetting fuse for secondary power transmission according to claim 1, characterized in that: the push rod (6) is a pin with a return spring, the connecting piece (46) comprises a first connecting rod (46A) connected with the first plunger (41) and a second connecting rod (46B) connected with the second plunger (42), the push rod (6) is over against the joint of the first connecting rod (46A) and the second connecting rod (46B) after the energy storage piston (4) is reset, the first connecting rod (46A) and the second connecting rod (46B) can be close to the separable connection which cannot be far away through a one-way rotating gear, the first connecting rod (46A) and the second connecting rod (46B) can be bent, and the bottom of the second inner electrode (44) is provided with elasticity to enable the second inner electrode (44) and the first inner electrode (43) to achieve interference fit with elasticity.

3. The self-resetting fuse for secondary power transmission according to claim 2, characterized in that: the first connecting rod (46A) is lower than the second connecting rod (46B), the gear is arranged on the second connecting rod (46B), the first connecting rod (46A) corresponds to the corresponding clamping groove, the longest length of the ejector rod (6) is just enough to enable the gear to be separated at the connecting position, and the tail end of the ejector rod can be lower than the axis of the gear in the middle.

4. The self-resetting fuse for secondary power transmission according to claim 2, characterized in that: the communication valve (8) is a one-way valve, the direction of the communication valve is that the air cavity (5) flows to the energy storage cavity (45), the second connecting rod (46B) is movably connected with the first plunger (41), and a gap between the second connecting rod (46B) and the first plunger (41) is sealed under the tension of the first connecting rod (46A).

5. The self-resetting fuse for secondary power transmission according to claim 1, characterized in that: the time delay part (7) is an air cylinder communicated with the air cavity (5), a one-way throttle valve is arranged in a communication channel between the time delay part (7) and the air cavity (5), the full circulation direction is that the air cavity (5) flows to the time delay part (7), the ejector rod (6) is movably connected with the time delay part (7) through a piston rod, and the elasticity of a spring on the ejector rod (6) when the ejector rod (6) just retracts is larger than the initial pressure of the time delay part (7).

6. A secondary power delivery self-resetting fuse according to claim 3, wherein: the inner wall of the time delay piece (7) is provided with a limiting structure (9) capable of being manually released, and the limiting structure (9) limits the sliding-out length of the ejector rod (6).

Technical Field

The invention relates to the technical field of electrical safety, in particular to a self-resetting fuse for secondary power transmission.

Background

As shown in fig. 6, the conventional self-resetting fuse mainly comprises an electrode, a melt, a piston and an argon gas filling cavity, wherein under the normal working condition, the melt has a small resistance to form a current path, while when an abnormal current passes through the fuse, metal sodium is gasified into a plasma state, the resistance is increased rapidly to play a role in strongly limiting the current, and after the temperature is recovered, the argon gas pushes the piston to compress the metal sodium, and simultaneously the metal sodium is recovered to a liquid state or a solid state, so that the circuit is reconnected.

According to the process, if the fault of the load circuit is not eliminated, the self-resetting fuse can continuously and repeatedly make and break the circuit, in order to avoid the phenomenon, the self-resetting fuse can be combined with other switching devices to be applied, the self-resetting fuse can greatly reduce the impact on a superior circuit after the circuit is fused in a very short time, and the self-resetting fuse can later cut off the circuit so as to avoid the repeated make and break of the circuit. In the process, in order to ensure the response of the latter, a parallel resistor needs to be added at the two ends of the former, so that the action current required by tripping can be provided for the latter after the circuit is in failure, the application circuit is complex, and the equipment cost is high.

Electrical communication usually needs secondary power transmission to avoid accidentally injuring maintenance personnel on a lower branch circuit in the power transmission process, and the self-resetting fuse does not have the process of secondary power transmission when recovering power supply, so if other switching circuits are connected in series with the self-resetting fuse, manual closing is still needed, which is troublesome, and if other circuit switches are not connected in series, a large potential safety hazard exists.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides a technical scheme of a secondary power transmission self-resetting fuse, which has the functions of secondary power transmission and repeated power failure, has the advantages of safety and reliability, and solves the problems in the background technology.

The invention provides the following technical scheme: a secondary power transmission self-resetting fuse comprises a shell, wherein end electrodes are arranged at two ends of the shell, a fusing cavity, an energy storage piston and an air cavity are sequentially arranged between the two end electrodes, the energy storage piston comprises a first plunger and a second plunger, the first plunger and the second plunger are detachably connected through a connecting piece, the first plunger and the second plunger are electrically connected through a first inner electrode and a second inner electrode, an energy storage cavity is arranged between the first plunger and the second plunger, a communicating valve with controllable flow direction is arranged between the energy storage cavity and the air cavity, the communicating valve controls air flow to flow from the air cavity to the energy storage cavity when expanding, the communicating valve is fully communicated after the connecting piece is separated, an ejector rod for triggering the tripping of the connecting piece is arranged on the inner wall of the shell, the ejector rod is triggered when the energy storage piston moves, and the connecting piece is triggered to separate only when the energy storage piston completes resetting, the ejector rod is provided with a time delay piece for delaying the reset of the ejector rod, and the energy storage piston resets for the second time when the ejector rod extends out.

Preferably, the ejector pin is the pin that has reset spring, the connecting piece is including the head rod of connecting first plunger and the second connecting rod of connecting the second plunger, the ejector pin is just to the junction of energy storage piston back head rod and second connecting rod that resets, head rod and second connecting rod realize can be close to the separable connection that can not keep away from through unidirectional rotation's gear, head rod and second connecting rod flexible, the bottom of second inner electrode has elasticity and makes second inner electrode and first inner electrode realize taking elastic interference fit.

Preferably, the first connecting rod is lower than the second connecting rod, the gear is arranged on the second connecting rod, the first connecting rod corresponds to the corresponding clamping groove, the longest length of the ejector rod is just enough to enable the gear to be separated from the connecting part, and the tail end of the ejector rod can be lower than the axis of the gear in the middle.

Preferably, the communication valve is a one-way valve, the direction of the communication valve is that an air cavity flows to the energy storage cavity, the second connecting rod is movably connected with the first plunger, and a gap between the second connecting rod and the first plunger is sealed under the tension of the first connecting rod.

Preferably, the delay element is an air cylinder communicated with the air cavity, a one-way throttle valve is arranged in a communication channel between the delay element and the air cavity, the full circulation direction is that the air cavity flows to the delay element, the ejector rod is movably connected with the delay element through a piston rod, and the elasticity of a spring on the ejector rod when the ejector rod just retracts is larger than the initial pressure of the delay element.

Preferably, the inner wall of the time delay piece is provided with a limiting structure capable of being manually released, and the limiting structure limits the sliding-out length of the ejector rod.

The invention has the following beneficial effects:

1. this secondary power transmission from fuse that restores to the throne can fuse fast through abnormal current for the first time to resume by oneself, and can make the card that resets die when abnormal current is passed through for the second time, avoid the emergence of outage repeatedly, secondly because the time delay setting has been carried out in the restoration of ejector pin, consequently the second abnormal current in the time of predetermineeing all can trigger permanent outage, remind the staff to find out the trouble, and the second abnormal current that surpasss the time of predetermineeing then can automatic recovery, need not artificial intervention.

2. This secondary power transmission from fuse, the potential energy of release when absorbing fusing chamber gasification through the energy storage chamber to release when the energy storage piston resets and make its short duration outage, the electric power recovery process has experienced twice power transmission, and the maintenance personal of subordinate's circuit can obtain the early warning and in time break away from the contact when once supplying power, the security when having improved electric power recovery, and on the other hand, this process need not artificial intervention, reduces the manpower extravagant.

Drawings

FIG. 1 is a schematic view of the present invention in normal operation;

FIG. 2 is a schematic diagram of the first time fusing is triggered according to the present invention;

FIG. 3 is a schematic view of the connector of the present invention in a disengaged condition;

FIG. 4 is a schematic view of the second connecting rod of the present invention being stuck;

FIG. 5 is a schematic view of a second connecting rod and a second inner electrode in the present invention;

fig. 6 is a schematic structural view of a conventional self-resetting fuse.

In the figure: 1. a housing; 2. a terminal electrode; 3. a fuse cavity; 4. an energy storage piston; 41. a first plunger; 42. a second plunger; 43. a first internal electrode; 44. a second internal electrode; 45. an energy storage cavity; 46. a connecting member; 46A, a first connecting rod; 46B, a second connecting rod; 5. an air cavity; 6. a top rod; 7. a time delay member; 8. a communication valve; 9. a limiting structure.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a secondary power transmission self-resetting fuse includes a housing 1, the housing 1 is made of austenitic stainless steel, a beryllium oxide porcelain core is embedded in the center of the housing 1, a glass body is filled between the stainless steel and the porcelain core to play a role of sealing and firming the porcelain core, end electrodes 2 are respectively arranged at two ends of the housing 1, a fuse cavity 3, an energy storage piston 4 and an air cavity 5 are sequentially arranged between the two end electrodes 2, the fuse cavity 3 is filled with sodium metal, the air cavity 5 is filled with argon gas, the air pressure is 20 mpa, the energy storage piston 4 includes a first plunger 41 and a second plunger 42, the first plunger 41 and the second plunger 42 are separably connected through a connecting piece 46, the first plunger 41 and the second plunger 42 are electrically connected through a first inner electrode 43 and a second inner electrode 44, the first inner electrode 43 and the second inner electrode 44 are tightly pressed to realize power on, and break a circuit after separation, an energy storage cavity 45 is arranged between the first plunger 41 and the second plunger 42, a communicating valve 8 with controllable flow direction is arranged between the energy storage cavity 45 and the air cavity 5, the communicating valve 8 controls air flow to flow from the air cavity 5 to the energy storage cavity 45 when expanding, the communicating valve 8 is fully communicated after the connecting piece 46 is separated, when the energy storage piston 4 moves towards the air cavity 5, argon in the air cavity 5 is compressed, the argon flows to the energy storage cavity 45 in a one-way mode, the pressure value in the energy storage cavity 45 is increased, along with the reduction of temperature, ionic state metal sodium in the fusing cavity 3 is changed back to liquid or solid, so that the energy storage piston 4 is gradually reset, a push rod 6 for triggering the tripping of the connecting piece 46 is arranged on the inner wall of the shell 1, the push rod 6 is triggered when the energy storage piston 4 moves for the first time, and only triggers the separation of the connecting piece 46 when the energy storage piston 4 completes resetting, a time delay piece 7 for delaying the resetting, make it keep the off-state for a long time, delay time is appropriate, reserves sufficient troubleshooting time, and this embodiment time sets up more than 24 hours, still is equipped with the artifical piece that resets that makes ejector pin 6 reset fast on the casing 1, the manual reset after the troubleshooting of being convenient for.

Wherein, the top rod 6 is a pin with a return spring, the top rod 6 extends out when the energy storage piston 4 moves to the rightmost end, the connecting piece 46 comprises a first connecting rod 46A connected with the first plunger 41 and a second connecting rod 46B connected with the second plunger 42, the top rod 6 is opposite to the joint of the first connecting rod 46A and the second connecting rod 46B after the energy storage piston 4 is reset, the first connecting rod 46A and the second connecting rod 46B can be close to and can not be separated from each other through a unidirectional rotating gear, the first connecting rod 46A and the second connecting rod 46B can be bent, in the process of resetting the energy storage piston 4, the top rod 6 slides to the second connecting rod 46B along the first connecting rod 46A, the second connecting rod 46B is bent to separate the gear from matching, the bottom of the second internal electrode 44 has elasticity to enable the second internal electrode 44 and the first internal electrode 43 to realize elastic matching, the interference fit does not affect the opening of the circuit when the second connector link 46B is jammed.

The first connecting rod 46A is lower than the second connecting rod 46B, the gear is arranged on the second connecting rod 46B, the first connecting rod 46A corresponds to the corresponding clamping groove, the gear is separated from the clamping groove when the ejector rod 6 penetrates through the clamping groove, the longest length of the extension of the ejector rod 6 meets the requirement that the gear is just separated at the joint, at the moment, the bending angle of the first connecting rod 46A is smaller and higher than the axis, the second connecting rod 46B can be reset, the tail end of the second connecting rod can be lower than the axis of the gear when the middle of the second connecting rod is in abnormal reset, the first connecting rod 46A clamps the gear on the second connecting rod 46B, and the first inner electrode 43 and the second inner electrode 44 are in a disconnected.

Wherein, the communicating valve 8 is a one-way valve, the direction air cavity 5 flows to the energy storage cavity 45, the second connecting rod 46B is movably connected with the first plunger 41, the gap between the second connecting rod 46B and the first plunger 41 is sealed under the pulling force of the first connecting rod 46A, and after the connecting piece 46 is separated, the second connecting rod 46B loses the sealing, so that the pressure of the air cavity 5 and the energy storage cavity 45 is restored to be balanced.

Wherein, time delay part 7 is the cylinder with air cavity 5 intercommunication, time delay part 7 and air cavity 5's intercommunication passageway are equipped with one-way choke valve, the direction of full circulation is air cavity 5 flow direction time delay part 7, ejector pin 6 passes through piston rod and time delay part 7 swing joint, when energy storage piston 4 compressed air cavity 5, high-pressure gas gets into 6 roll-offs of drive ejector pin in the time delay part 7, the spring on the ejector pin 6 is greater than time delay part 7 initial pressure, thereafter the choke valve slowly releases gas and makes ejector pin 6 retract, the flow area of choke valve is controllable, be used for manual reset.

Wherein, the inner wall of time delay 7 is equipped with limit structure 9 that can manually relieve, and limit structure 9 restriction ejector pin 6's roll-off length further extends after limit structure 9 relieves spacing, further depresses second connecting rod 46B, makes second connecting rod 46B and first connecting rod 46A relieve the card dead state, releases the interior high pressure of time delay 7 this moment, and ejector pin 6 retracts under elasticity, and connecting piece 46 resets, and then second plunger 42 resets.

The working principle and the working process of the invention are as follows:

when a circuit is in fault or overload, the metal sodium in the fusing cavity 3 is gasified, the volume is expanded, the resistance is increased sharply, the air cavity 5 is compressed through the energy storage piston 4, the air pressure in the air cavity 5 rises, the air pressure in the time delay part 7 and the energy storage cavity 45 is further increased, the time delay part 7 drives the ejector rod 6 to slide out, the ejector rod 6 is always in the energy storage cavity 45, along with the disconnection of the circuit, the temperature in the fusing cavity 3 is reduced to become liquid or fixed, the pressure is decreased sharply, the air in the air cavity 5 drives the energy storage piston 4 to reset, at the moment when the energy storage piston 4 finishes resetting, if the fault is eliminated, the ejector rod 6 triggers the connecting piece 46 to be separated, at the moment, the air pressure in the energy storage cavity 45 is higher than the air pressure in the air cavity 5 to drive the second plunger 42 to move, the first inner electrode 43 and the second inner electrode 44 are separated from the disconnection circuit, the pressure of the second, the second inner electrode 44 is reset under the action of a spring, the circuit is communicated, if the fault is eliminated, the metal sodium in the fusing cavity 3 is gasified again, the energy storage piston 4 is enabled to move, at the moment, the second connecting rod 46B is tripped, the ejector rod 6 is in an ejection state, the ejector rod 6 enables the first connecting rod 46A and the second connecting rod 46B to be bent while the energy storage piston 4 compresses argon gas, the energy storage piston is enabled to be always in a tripping state, when the temperature is reduced and the pressure is recovered, the volume is increased due to high air pressure in the energy storage cavity 45, the first connecting rod 46A and the second connecting rod 46B are further far away, the first connecting rod 46A obtains a movement space clamped below the gear axis of the second connecting rod 46B, the first connecting rod 46A is clamped, the second plunger 42 cannot.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.