WO2018045641A1

WO2018045641A1 - Thermal-tripping arc extinguishing device and method for power surge protector

Info

Publication number: WO2018045641A1
Application number: PCT/CN2016/108033
Authority: WO
Inventors: 曾瑞; 雷全学; 王寅生; 崔利俊; 吴波
Original assignee: 深圳康普盾科技股份有限公司
Priority date: 2016-09-07
Filing date: 2016-11-30
Publication date: 2018-03-15
Also published as: CN107800126A

Abstract

A thermal-tripping arc extinguishing device and method for a power surge protector. The device comprises a box body (10), as well as a buckling structure, an arc extinguishing mechanism, and a deviation mechanism which are provided in the box body (10). The buckling structure comprises an electrode (40) provided in the arc extinguishing mechanism and a swing rod (50) supported by the deviation mechanism. The electrode (40) and the swing rod (50) are welded to form a buckling welding spot, and form an electric connection between the electrode (40) and the swing rod (50). When a passing current exceeds a defined value, the buckling welding spot is heated and melted, the deviation mechanism pushes the swing rod (50) to move towards the outside of the arc extinguishing mechanism, the electrode (40) and the swing rod (50) are separated, the arc extinguishing mechanism slides towards the buckling welding spot, and the electrode (40) is embedded into the arc extinguishing mechanism. According to the solution, during thermal protection for excessive power surge, the buckling welding spot is heated and melted, the arc extinguishing mechanism covers the electrode (40), the deviation mechanism pushes the swing rod (50) to move towards the outside of the arc extinguishing mechanism, and the electrode (40) and the swing rod (50) are separated in all directions, so that electric arcs are completely avoided between the electrode (40) and the swing rod (50) or electric arcs are prevented from creeping along the bottom and the side surface. The device has high temperature resistance, good stability, simple structure, and low costs.

Description

Power surge protector thermal trip arc extinguishing device and method thereof

Technical field

The invention relates to the technical field of surge protectors, and more particularly to a power surge protector thermal trip arc extinguishing device and a method thereof.

Background technique

Power surge protector, also known as power surge protector, is suitable for low voltage power supply systems of various voltage levels (including DC1500V). It protects against indirect lightning and direct lightning effects or other transient overvoltage surges. It is suitable for residential homes. The requirements for surge protection in the tertiary industry and the industrial sector have protection modes such as facing the ground, negative to ground, relative phase, relative, relative midline, midline to ground and combinations thereof.

At present, the structure of the power surge protector for thermal tripping and arc extinguishing on the market generally adopts a structure in which a plastic member is shielded and cut. The method of shielding the plastic parts is only 200-300 °C, the high temperature generated by the arc during tripping, so that the plastic is scorched and carbonized, and the structural parts affecting the arc extinguishing function can better play the role of arc extinguishing; the electrical equipment generally adopts vacuum Arc-extinguishing mode, high vacuum arc-extinguishing space, low adaptability range (temperature -40-40 °C, altitude not exceeding 1000 m, etc.), high cost, so it is not suitable for use with surge protector tripping and arc extinguishing; The arc-extinguishing method in the field of surge protector generally adopts the plastic spacer partitioning method. This method cannot withstand high temperature, and it is easy to make charring and carbonization, and the structural parts that affect the arc-extinguishing function can better exert the function of arc-extinguishing.

Chinese patent 200910105539.2 discloses a surge protection device for a low-voltage distribution system, comprising a box body, an elastic electrode, a trip joint and an alarm device; a semiconductor chip is arranged in a cavity on one side of the box body, and an alarm is installed on the other side cavity. The device and the elastic electrode, one pole of the semiconductor chip is connected to the elastic electrode through the tripping solder joint, the other end of the semiconductor chip is connected to a common electrode sheet, and the elastic electrode is pressed on the alarm device; the alarm device is an elastic metal sheet mechanism It comprises two elastic metal sheets arranged one above the other, one of the two elastic metal sheets being pressed under the elastic electrode.

The above patents generate an alarm signal from the thermal trip to avoid secondary faults, and do not indicate how to completely cut off the arc, prevent arcing or arcing from creeping along the bottom and sides, and withstand high temperatures.

Therefore, it is necessary to design a power surge protector thermal tripping arc extinguishing device to completely cut off the arc, prevent arcing or arcing from creeping along the bottom and sides, and withstand high temperatures.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a power surge protector thermal trip arc extinguishing device and method thereof.

In order to achieve the above object, the present invention adopts the following technical solutions: a power surge protector thermal trip arc extinguishing device, including a box body, and a buckle structure, an arc extinguishing mechanism and a dislocation mechanism disposed in the casing; the buckle structure The utility model comprises an electrode arranged in the arc extinguishing mechanism and a swinging rod supported by the dislocation mechanism; the electrode is welded with the pendulum rod to form a joint welding joint, and constitutes an electrical connection between the electrode and the swing rod; when the current passing exceeds the limit When the value is reached, the buckled joint is heated and melted, and the dislocation mechanism pushes the swing rod to move toward the outer side of the arc extinguishing mechanism, the electrode and the swing rod are separated, and the arc extinguishing mechanism faces the buckle Sliding, the electrode is embedded in the arc extinguishing mechanism.

A further technical solution is that the arc extinguishing mechanism includes a sliding structure disposed in the casing, an arc extinguishing cover slidably coupled to the sliding structure, and a driving of the arc extinguishing cover to move up and down along the sliding structure The arc extinguishing elastic member is embedded in the arc extinguishing cover when the buckled solder joint is melted by heat.

A further technical solution is that the arc extinguishing cover includes a connecting plate and side plates respectively located at two sides of the connecting plate, and the two side plates are respectively connected to the sliding structure, and the connecting plate is provided with a convex a post connected to the arc extinguishing elastic member, wherein the connecting plate is provided with two intermediate plates, the stud being located between the two intermediate plates, wherein one of the side plates and the side plate A slot is formed between the intermediate plates, and when the buckled joint is melted by heat, the electrode is embedded in the socket.

A further technical solution is that the material of the arc extinguishing cover is ceramic.

A further technical solution is that the side wall of the socket is coated with high pressure grease.

A further technical solution is: the lower end of the arc extinguishing cover is provided with a lug, and the upper end of the swing bar is provided with a stopper extending outward, and when the buckled joint is not thermally sealed, the stopper is adjacent to the a lug of the arc extinguishing cover, the arc extinguishing elastic member being in a compressed state.

A further technical solution is that the inner wall of the box is provided with a groove, and the side of the arc extinguishing cover close to the moving direction of the swing bar is embedded in the groove and has a gap.

A further technical solution is that the dislocation mechanism comprises a push rod and a dislocation elastic member, the dislocation elastic member is located between the push rod and a side end of the box body, a lower end of the swing rod and the push rod Abut.

A further technical solution is that the dislocation mechanism further comprises a torsion spring, the torsion spring is connected to the lower end of the swing rod, the arc extinguishing elastic member is a spring, and the dislocation elastic member is a spring.

The invention provides a method for thermal tripping and arc extinguishing of a power surge protector, which is formed by welding an electrode and a pendulum rod subjected to a side thrust to form a buckled electrical connection loop. When the current of the electrical connection loop exceeds a set value, the electrode and the pendulum The joint welding joint of the rod is melted by heat, and the swing rod is laterally deviated from the electrode. At the same time, the arc extinguishing mechanism sleeved on the outer circumference of the electrode is subjected to the action of the arc extinguishing elastic member, sliding to the joint welding point, and the electrode is Covered in the arc extinguishing mechanism.

The beneficial effects of the present invention compared with the prior art are: the power supply surge protector of the present invention is provided with a snap-fit structure, an arc extinguishing mechanism and a dislocation mechanism, when the power surge exceeds the thermal protection The joint solder joint is heated and melted, and the arc extinguishing mechanism covers the electrode to prevent arcing between the electrode and the swing rod. The dislocation mechanism pushes the swing rod toward the outer side of the arc extinguishing mechanism, and the electrode and the swing rod are separated from each direction, completely Prevent arcing or arc between the electrode and the pendulum to climb along the bottom and side, high temperature resistance, good functional stability, simple structure, convenient installation and low cost.

The invention is further described below in conjunction with the drawings and specific embodiments.

DRAWINGS

1 is a schematic perspective structural view of a thermal surge arrester for a power surge protector according to an embodiment of the present invention;

2 is a schematic perspective view showing a three-dimensional structure of a thermal surge arrester for a power surge protector according to an embodiment of the present invention (before removing a box body and a joint solder joint from a heat fuse);

3 is a schematic perspective view showing a three-dimensional structure of a thermal surge arrester for a power surge protector according to an embodiment of the present invention (after removing a box body and a joint solder joint from a heat fuse);

4 is a schematic perspective view of an arc extinguishing cover according to an embodiment of the present invention (enlarged).

Reference numeral

10 box 11 groove

20 arc extinguishing elastic parts 21 bumps

22 sliding structure 30 arc extinguishing cover

31 connecting plate 32 side plate

33 studs 34 intermediate plate

35 lug 40 electrode

50 swing lever 51 stop

60 soft connector 70 torsion spring

80 push rod 81 fixed case

82 misaligned elastic parts 90 prongs

detailed description

In order to more fully understand the technical content of the present invention, the technical solutions of the present invention are further described and illustrated in conjunction with the specific embodiments, but are not limited thereto.

As shown in the specific embodiments shown in FIG. 1 to FIG. 4, the power supply surge protector thermal tripping arc extinguishing device provided in this embodiment can be used for the safe operation protection of the SPD in the low voltage (including DC1500V) power supply system for each voltage level. In the process of avoiding the short circuit accident caused by the voltage difference arc discharge between the two electrodes 40 when the SPD in the power supply system is disconnected, and the fire accident caused by the excessive temperature; the device can also be applied to various AC/DC power sources. During the SPD trip arc interruption of the system, the arc is completely cut off to prevent arcing or arcing from creeping along the bottom and sides, and high temperature resistance.

The power surge protector thermal tripping arc extinguishing device comprises a box body 10, and a buckle structure, an arc extinguishing mechanism and a dislocation mechanism disposed in the box body 10; the buckle structure comprises an electrode disposed in the arc extinguishing mechanism 40 and a swinging rod 50 supported by the dislocation mechanism; the electrode 40 is welded to the swinging rod 50 to form a joint welding joint, and constitutes an electrical connection between the electrode 40 and the swinging rod 50; when the current passing exceeds a limit value, The buckled joint is heated and melted, and the dislocation mechanism pushes the swinging rod 50 to move toward the outer side of the arc extinguishing mechanism, the electrode 40 and the swinging rod 50 are separated, and the arc extinguishing mechanism faces the buckle Sliding, the electrode 40 is embedded in the arc extinguishing mechanism.

The above-mentioned power surge protector thermal tripping arc extinguishing device is provided with a buckle structure, an arc extinguishing mechanism and a dislocation mechanism. When the power source surge is overheated, the joint solder joint is heated and melted, and the arc extinguishing mechanism covers the electrode. 40, preventing arcing between the electrode 40 and the swing rod 50, the displacement mechanism pushes the swing rod 50 to move to the outside direction of the arc extinguishing mechanism, and the electrode 40 and the swing rod 50 are separated from each direction, completely preventing the electrode 40 and the swing rod 50 from being The arc or arc is generated to climb along the bottom and sides, with high temperature resistance, good functional stability, simple structure, convenient installation and low cost.

Further, the above-mentioned arc extinguishing mechanism includes a sliding structure 22 disposed in the casing 10, an arc extinguishing cover 30 slidably coupled to the sliding structure 22, and a driving mechanism for driving the arc extinguishing cover 30 to move up and down along the sliding structure 22. The arc-extinguishing elastic member 20 is embedded in the arc-extinguishing cover 30 when the joint-welded joint is heated and melted to prevent an arc from being generated between the electrode 40 and the swing rod 50.

In this embodiment, the arc extinguishing cover 30 includes a connecting plate 31 and side plates 32 respectively located at two sides of the connecting plate 31. The two side plates 32 are respectively connected with the sliding structure 22, and the connecting plate 31 is provided with a protruding column. 33, the stud 33 is connected with the arc extinguishing elastic member 20, and the connecting plate 31 is provided with two intermediate plates 34. The stud 33 is located between the two intermediate plates 34, and between one of the side plates 32 and the intermediate plate 34 A slot is formed, and when the joint solder joint is melted by heat, the electrode 40 is embedded in the slot.

In the present embodiment, the sliding structure 22 includes a sliding rail. In other embodiments, the sliding structure 22 may be a screw or the like.

In addition, the material of the arc extinguishing cover 30 is ceramic, and the temperature resistance of the ceramic is up to 1450 ° C, and the original shape can be maintained in the high temperature impact of the lightning surge, and the set function is continued, and other non-high temperature resistance can be effectively performed. The parts are separated to prevent the non-high temperature resistant parts from being damaged and affecting the function.

The side wall of the slot is coated with high pressure grease to effectively prevent the arc from creeping from the bottom.

In the case where the trip joint is not melted, in order to prevent the arc extinguishing elastic member 20 from being ejected, the casing 10 is provided with the bumps 21, and the sliding structure 22 is located on both sides of the bump 21.

The lower end of the arc extinguishing cover 30 is provided with a lug 35. The upper end of the swinging bar 50 is provided with a stopper 51 extending outward. When the tripping joint is not melted, the stopper 51 is pressed against the lug 35 of the arc extinguishing cover 30. The arc elastic member 20 is compressed, and the arc extinguishing cover 30 does not slide.

The inner wall of the casing 10 is provided with a groove 11 , and the side of the arc extinguishing cover 30 adjacent to the moving direction of the swinging rod 50 is embedded in the groove 11 and has a gap. The groove 11 can cause an arc to be less generated between the swing link 50 and the electrode 40.

Further, the dislocation mechanism includes a push rod 80 and a dislocation elastic member 82. The dislocation elastic member 82 is located between the push rod 80 and the side end of the casing 10. The lower end of the swing rod 50 is offset from the push rod 80. Then, when the joint solder joint is heated and melted, the dislocation elastic member 82 is compressed, and when the joint solder joint is heated and melted, the dislocation elastic member 82 drives the push rod 80 to move outward, and the swing rod 50 is laterally deviated from the electrode 40, and the electrode 40 and the pendulum The rods 50 are separated, and the arc extinguishing cover 30 is slid toward the joint welding joints, and the electrode 40 is wrapped in the arc extinguishing mechanism.

In addition, the dislocation mechanism further includes a torsion spring 70 that is coupled to the lower end of the swing link 50, and simultaneously drives the swing link 50 laterally away from the electrode 40 by the push rod 80 and the torsion spring 70.

In the embodiment, the arc extinguishing elastic member 20 is a spring, and the dislocation elastic member 82 is a spring.

Further, the two ends of the dislocation elastic member 82 are respectively provided with baffles, and the push rod 80 is connected with a fixed casing 81. The fixed casing 81 is provided with a sliding plate, and the sliding plate is located at the baffle plate. At the outer end, when the dislocation elastic member 82 moves, the push rod 80 and the fixed housing 81 are moved together.

The lower end of the casing 10 is provided with a pin 90. The upper end of the pin 90 extends upward into the casing 10, and the lower end of the push rod 80 is connected to the pin 90 by a soft connector 60.

The thermal tripping arc extinguishing device of the power surge protector provided by the embodiment adopts the arc extinguishing cover 30 made of ceramic material to cut off the arc to completely cut off the arc, and avoids the problem that the arc is not completely cut off and intermittently discharges, and the ceramic is used. The material has a temperature resistance up to 1450 °C, avoiding the melting of the separator caused by the high temperature of the arc, effectively preventing the heat from overflowing and destroying other adjacent parts. The ceramic is not deformed and is not damaged, and can smoothly slide after the trip. Without the card position, the high-efficiency isolation cut-off arc-extinguishing function is exerted, and the high-pressure silicone grease coated in the slot of the arc-extinguishing cover 30 can effectively prevent the arc from penetrating from the bottom, and the elastic member is pushed up to realize the swing rod 50 and the electrode 40. Separation, simple structure, arc-extinguishing function in a narrower and lower space, convenient installation and low cost.

The embodiment further provides a method for the thermal tripping and arc extinguishing of the power surge protector: the electrode 40 is welded to the swing rod 50 subjected to the side thrust to form a closed electrical connection loop, when the current of the electrical connection loop exceeds a set value. The joint between the electrode 40 and the swinging rod 50 is thermally fused. The swinging rod 50 is laterally offset from the electrode 40 by the side thrust. At the same time, the arc extinguishing mechanism sleeved on the outer circumference of the electrode 40 is subjected to the arc extinguishing elastic member. Sliding to the joint weld joint, the electrode 40 is wrapped in the arc extinguishing mechanism.

The method for the thermal de-arcing of the power surge protector can be implemented by using the above-mentioned power surge protector thermal de-interrupting device, or can be implemented by other arc extinguishing devices.

In the process of using the above-mentioned power surge protector thermal de-arcing device to realize the arc extinguishing method, the joint welding point of the electrode 40 and the swing rod 50 is thermally fused, and the swing lever 50 is under the action of the torsion spring 70 and the push rod 80. The arc extinguishing cover 30 is first raised upward, and the swinging lever 50 is moved toward the outer side of the arc extinguishing mechanism by the side thrust, and is laterally offset from the electrode 40.

The above technical description of the present invention is further described by way of example only, and is not to be understood by the reader, but the embodiments of the present invention are not limited thereto, and any technology extending or re-creating according to the present invention is subject to the present invention. protection of. The scope of the invention is defined by the claims.

Claims

The power surge protector thermal tripping arc extinguishing device is characterized in that it comprises a box body, a buckle structure disposed in the box body, an arc extinguishing mechanism and a dislocation mechanism; and the buckle structure comprises an arc extinguishing mechanism An electrode and a swing rod supported by the dislocation mechanism; the electrode is welded to the swing rod to form a joint and a solder joint, and constitutes an electrical connection between the electrode and the swing rod; when the current passing exceeds a limit value, the joint welding The point is heated and melted, the dislocation mechanism pushes the swing rod to move toward the outer side of the arc extinguishing mechanism, the electrode and the swing rod are separated, the arc extinguishing mechanism slides toward the buckle point, and the electrode is embedded in the Said in the arc extinguishing mechanism.
The thermal surge arrester for a power surge protector according to claim 1, wherein the arc extinguishing mechanism comprises a sliding structure disposed in the casing, and an arc extinguishing cover slidingly connected to the sliding structure. And an arc extinguishing elastic member for driving the arc extinguishing cover to move up and down along the sliding structure. When the buckled solder joint is heated and melted, the electrode is embedded in the arc extinguishing cover.
The power supply surge protector thermal tripping arc extinguishing device according to claim 2, wherein the arc extinguishing cover comprises a connecting plate and side plates respectively located at two sides of the connecting plate, and the two sides are The connecting plate is respectively connected to the sliding structure, and the connecting plate is provided with a protruding post, the protruding post is connected with the arc-extinguishing elastic member, and the connecting plate is provided with two intermediate plates, and the protruding column is located at two Between the intermediate plates, a slot is formed between one of the side plates and the intermediate plate, and when the buckled solder joint is heated and melted, the electrode is embedded in the slot.
The power surge protector thermal trip arc extinguishing device according to claim 3, wherein the material of the arc extinguishing cover is ceramic.
The power surge protector thermal trip arc extinguishing device according to claim 4, wherein the side wall of the socket is coated with high pressure grease.
The thermal surge arrester of the power surge protector according to claim 3, wherein the lower end of the arc extinguishing cover is provided with a lug, and the upper end of the swing bar is provided with a stopper extending outwardly. When the buckled solder joint is not thermally fused, the stopper abuts the lug of the arc extinguishing cover, and the arc extinguishing elastic member is in a compressed state.
The device of claim 6 is characterized in that: the inner wall of the casing is provided with a groove, and the arc-extinguishing cover is embedded in a side of the moving direction of the pendulum rod. Provided in the groove and leaving a gap.
The power supply surge protector thermal trip arc extinguishing device according to any one of claims 2 to 7, wherein the dislocation mechanism comprises a push rod and a dislocation elastic member, and the dislocation elastic member is located at the push rod The lower end of the swing lever abuts against the push rod between the side ends of the casing.
The power supply surge protector thermal trip arc extinguishing device according to claim 8, wherein the dislocation mechanism further comprises a torsion spring, and the torsion spring is coupled to a lower end of the swing rod, the arc extinguishing elasticity The member is a spring, and the dislocation elastic member is a spring.
The utility model relates to a thermal tripping arc extinguishing method for a power surge protector, which is characterized in that an electric connection circuit is formed by welding an electrode and a pendulum rod subjected to a side thrust, and when the current of the electric connection circuit exceeds a set value, the electrode and the pendulum The joint welding joint of the rod is melted by heat, and the swing rod is laterally deviated from the electrode. At the same time, the arc extinguishing mechanism sleeved on the outer circumference of the electrode is subjected to the action of the arc extinguishing elastic member, sliding to the joint welding point, and the electrode is Covered in the arc extinguishing mechanism.