Varistor for surge protector and surge protector

Abstract

The present invention discloses a varistor for a surge protector and a surge protector. The varistor includes a varistor body, a first electrode and a second electrode provided on the varistor body. Among them, the first electrode is integrally formed with a first pin for plugging and unplugging connection of the surge protector, the second electrode is used for welding with an electrode connecting member of the surge protector, and a second pin for plugging and unplugging connection of the surge protector is provided on the electrode connecting member. The technical solution provided by the present invention can reduce the welding process in the production process of the surge protector, improve the reliability of the product and the production efficiency of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of overvoltage and overcurrent protection, and particularly to a varistor for a surge protector and a surge protector. Background Art

[0002] Lightning is one of the top ten natural disasters. With the progress of technology, equipment is becoming more intelligent and highly integrated, and is becoming more sensitive to the instantaneous overvoltage - surge caused by lightning. In addition, the start and stop of high-power equipment will also generate surges. Surge protectors can prevent damage to equipment caused by surges and are widely used in industries such as communication, construction, rail transit, power, new energy, petrochemical, etc. When a spike current or voltage is generated in an electrical circuit due to lightning strikes or external interference, the surge protector can conduct within an extremely short time, discharge the current, and limit the voltage to a lower level, thereby avoiding damage to other equipment in the circuit caused by surges.

[0003] In surge protectors for distribution systems, the commonly used component is a varistor. The varistor has a very large resistance under normal operating conditions, equivalent to an open circuit state, and when the voltage in the circuit exceeds a predetermined value, its resistance drops sharply and it is in a conducting state, capable of discharging a large amount of current and limiting the overvoltage level.

[0004] However, after long-term use, the varistor will gradually age, the leakage current will gradually increase, disrupting the thermal balance and causing the product temperature to continuously rise. To prevent the varistor from causing a fire accident due to overheating, a thermal protection tripping device is usually provided in the surge protector to disconnect the varistor from the circuit when the temperature rises. After the varistor is disconnected from the circuit, the surge protector has failed and will lose its protective effect on the equipment. The failed surge protector is provided with a status indicator to prompt maintenance personnel to replace it in a timely manner. In some unattended occasions, a telemetry device also needs to be designed to remotely indicate the failure status of the surge protector.

[0005] Currently, due to the complex internal structure of existing surge protectors, not only does it lead to a long production cycle, but also the product reliability is low. Summary of the Invention

[0006] The object of the present invention is to solve the problems of the current surge protector, such as complex internal structure, low reliability, and long production cycle.

[0007] To achieve the above object, the present invention provides a varistor for a surge protector, the varistor comprising a varistor body and a first electrode and a second electrode provided on the varistor body;

[0008] Among them, the first electrode is integrally formed with a first pin for the pluggable connection of the surge protector, the second electrode is used for welding with the electrode connector of the surge protector, and the electrode connector is provided with a second pin for the pluggable connection of the surge protector.

[0009] Preferably, the first electrode is an integrally formed sheet structure. The first electrode includes a connecting portion attached to the varistor body and a protruding portion extending out of the varistor body, and the first pin is formed on the protruding portion.

[0010] Preferably, the connecting portion of the first electrode is an annular sheet attached to the varistor body, the protruding portion extends from the annular sheet, and the end of the protruding portion is bent in a direction away from the end to form the first pin.

[0011] Preferably, the protruding portion has two bends that are parallel and in opposite directions near the first pin.

[0012] Preferably, the second electrode is an integrally formed sheet structure. The second electrode is attached to the second side of the varistor body, and a welding portion protruding away from the second side of the varistor body is bent on the second electrode, and the electrode connector is welded to the welding portion.

[0013] Preferably, the second electrode is an annular sheet.

[0014] According to another aspect of the present invention, a surge protector is further provided. The surge protector includes a carrier, an electrode connector, and a varistor as described above;

[0015] Among them, the carrier includes a mounting plate. The mounting plate is provided with electrode through holes penetrating both sides. The varistor is mounted on the first side of the mounting plate, the electrode connector is mounted on the second side of the mounting plate. One end of the electrode connector is welded to the second electrode of the varistor through the electrode through hole, and the other end is provided with a second pin; among them, the first pin of the varistor and the second pin on the electrode connector extend out of the carrier for the plugging of the surge protector;

[0016] The surge protector further includes a tripping mechanism. The tripping mechanism is mounted on the second side of the mounting plate. The tripping mechanism is configured such that when the electrode connector is welded and fixed to the second electrode, the tripping mechanism is in a first state, and when the welding between the electrode connector and the second electrode melts, the tripping mechanism automatically switches from the first state to a second state.

[0017] In the technical solution provided by the present invention, the first electrode of the varistor is formed with a first pin by itself, which can reduce the additional welding points and connecting components. In this way, not only the welding process can be reduced, but also the production efficiency and the reliability of the product can be improved. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a varistor according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the varistor viewed from the other side;

[0020] Figure 3 is a schematic structural diagram of the carrier;

[0021] Figure 4 is a schematic structural diagram of the carrier viewed from the other side;

[0022] Figure 5 is a schematic structural diagram of the varistor installed on the carrier;

[0023] Figure 6 is a schematic structural diagram of the electrode connecting member and the tripping mechanism installed on the carrier (the tripping mechanism is in the first state);

[0024] Figure 7 is a schematic structural diagram of the electrode connecting member and the tripping mechanism installed on the carrier (the tripping mechanism is in the second state).

[0025] Description of the Reference Numerals:

[0026] 1 - housing; 2 - carrier; 21 - mounting plate; 211 - electrode through - hole; 22 - first support; 23 - second support; 24 - rotating shaft; 25 - spring connection part; 3 - varistor; 31 - varistor body; 32 - first electrode; 321 - connection part; 322 - first pin; 33 - second electrode; 331 - welding part; 4 - electrode connecting member; 41 - second pin; 42 - welding end; 5 - rotating body; 6 - energy - storing spring. Detailed Embodiments

[0027] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0028] In addition, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that one or more of the specific details may be omitted to practice the technical solutions of the present disclosure, or other methods, components, devices, steps, etc. may be adopted. In other cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0029] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right", etc. may be used herein to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" other elements or features. Thus, the exemplary term "lower" can encompass both upper and lower orientations. The device can also be positioned in other ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein can be interpreted accordingly.

[0030] The present invention provides a varistor for a surge protector, as Figure 1 and Figure 2 shown, the varistor 3 includes a varistor body 31 and a first electrode 32 and a second electrode 33 provided on the varistor body 31;

[0031] Wherein, the first electrode 32 is integrally formed with a first pin 322 for plugging and unplugging connection of the surge protector, the second electrode 33 is used for welding with an electrode connecting member 4 of the surge protector, and a second pin 41 for plugging and unplugging connection of the surge protector is provided on the electrode connecting member 4.

[0032] In the technical solution provided by the present invention, the first electrode 32 of the varistor 3 is formed with the first pin 322 itself. Compared with the prior art method of welding pins on the electrodes of the varistor, it can reduce additional welding points and connecting components, which can not only reduce the welding process, but also improve production efficiency and product reliability.

[0033] In a preferred embodiment, as Figure 1As shown, the first electrode 32 is a sheet structure formed integrally. The first electrode 32 includes a connecting portion 321 attached to the varistor body 31 and a protruding portion extending from the varistor body 31. The first pin 322 is formed on the protruding portion. Among them, the connecting portion 321 of the first electrode 32 is an annular sheet attached to the varistor body 31. The protruding portion extends from the annular sheet, and the end of the protruding portion is bent in a direction away from the end to form the first pin 322.

[0034] To increase the elasticity of the first pin 322, the protruding portion has two bends parallel and in opposite directions near the first pin 322, as Figure 1 shown by the bends at A and B.

[0035] As Figure 2 shown, the second electrode 33 is a sheet structure formed integrally. The second electrode 33 is attached to the second side of the varistor body 31. The second electrode 33 is preferably an annular sheet. Among them, a welding portion 331 protruding in a direction away from the second side of the varistor body 31 is bent on the second electrode 33, and the electrode connector 4 is welded to the welding portion 331.

[0036] Those skilled in the art can understand that the structures of the first electrode 32 and the second electrode 33 are not limited to the structural forms in this embodiment, and any other structural forms in which pins are integrally formed on the first electrode 32 are acceptable.

[0037] According to another aspect of the present invention, a surge protector is further provided. The surge protector includes a carrier 2, an electrode connector 4, and the varistor 3 as described above;

[0038] In one embodiment, as Figure 3 and Figure 4 shown, the carrier 2 includes a mounting plate 21. An electrode through-hole 211 penetrating both sides is provided on the mounting plate 21. Among them Figure 3 shows the first side of the mounting plate 21, Figure 4 shows the second side of the mounting plate 21.

[0039] As Figure 5 shown, the varistor 3 is mounted on the first side of the mounting plate 21. The first electrode 32 faces outward, the second electrode 33 faces the mounting plate 21, and the welding portion 331 on the second electrode 33 corresponds to the electrode through-hole 211. As Figure 6 and Figure 7As shown, the electrode connector 4 is installed on the second side of the mounting plate 21. The welding end 42 of the electrode connector 4 is welded to the welding part 331 of the second electrode 33 of the varistor 3 through the electrode via hole 211, and the other end is provided with a second pin 41. Among them, the first pin 322 of the varistor 3 and the second pin 41 on the electrode connector 4 extend out of the carrier 2 for the surge protector to be plugged in.

[0040] In this embodiment, the first pin 322 and the second pin 41 are respectively bent in a direction away from the terminal end to form slots. The carrier 2 is provided with a first support body 22 and a second support body 22 (refer to Figure 3 and Figure 4 ). The first support body 22 is inserted into the slot of the first pin 322, and the second support body 23 is inserted into the slot of the second pin 41 to respectively increase the stability of the first pin 322 and the second pin 41 during plugging.

[0041] The surge protector further includes a tripping mechanism. The tripping mechanism is installed on the second side of the mounting plate 21. The tripping mechanism is configured such that when the electrode connector 4 is welded and fixed to the second electrode 33, the tripping mechanism is in a first state, and when the welding between the electrode connector 4 and the second electrode 33 melts, the tripping mechanism automatically switches from the first state to a second state.

[0042] In this embodiment, as Figure 6 and Figure 7 shown, the tripping mechanism includes a rotating body 5 rotatably installed on the second side of the mounting plate 21 and a potential energy spring 6 provided between the rotating body 5 and the carrier 2. Among them, the rotating body 5 is rotatably installed on the rotating shaft 24 of the mounting plate 21. One end of the potential energy spring 6 is connected to the rotating body 5, and the other end is connected to the spring connection part 25 of the carrier 2.

[0043] When the electrode connector 4 and the second electrode 33 are in a welded state, the welding of the electrode connector 4 and the second electrode 33 limits the rotating body 5 at a first position, and the potential energy spring 6 remains in a compressed or stretched potential energy state. When the solder between the electrode connector 4 and the second electrode 33 melts, the potential energy spring 6 drives the rotating body 5 to rotate to a second position by elastic force to separate the electrode connector 4 and the second electrode 33 through the rotating body 5.

[0044] Figure 6shows the position where the rotating body 5 is restricted when the electrode connection member 4 and the second electrode 33 are in a welded state. At this time, the energy storage spring 6 is in a stretched energy storage state between the rotating body 5 and the carrier 2. Of course, for example, the energy storage spring 6 can be set in a contracted energy storage state by changing the installation method of the energy storage spring 6. When a fault such as deterioration or short circuit occurs in the varistor 3 and the temperature gradually rises to melt the solder between the second electrode 33 of the varistor and the electrode connection member 4, the restriction on the rotating body 5 is eliminated. Under the elastic force of the energy storage spring 6 in the stretched state, the rotating body 5 will rotate around the rotating shaft 24 from the first position to the second position, as Figure 7 the state shown.

[0045] Those skilled in the art can understand that the tripping mechanism is not limited to the structural form described above in this embodiment. Any other form of tripping mechanism that can change its state to isolate the electrode connection member 4 and the second electrode 33 when the solder between the electrode connection member 4 and the second electrode 33 melts is acceptable. For example, a translation member that can translate relative to the carrier 2 can be provided, and a spring is provided between the translation member and the carrier 2. When the electrode connection member 4 and the second electrode 33 are in a welded state, the translation member is restricted at the first position, and the spring is in a compressed or stretched energy storage state. When the welding melts, the translation member moves under the elastic force of the spring to be between the welding parts of the electrode connection member 4 and the second electrode 33 for isolation.

[0046] In addition, the surge protector further includes a housing 1, and the carrier 2, the varistor 3, and the electrode connection member 4 are all located inside the housing 1.

[0047] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any suitable combination of each specific technical feature. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A varistor for a surge protector, the varistor comprising a varistor body, a first electrode and a second electrode provided on the varistor body, characterized in that: Among them, The first electrode is integrally formed with a first pin for pluggable connection of the surge protector, the second electrode is used for welding with an electrode connecting member of the surge protector, and the electrode connecting member is provided with a second pin for pluggable connection of the surge protector; The first electrode is a sheet structure integrally formed. The first electrode includes a connecting portion attached to the varistor body and an extending portion extending out of the varistor body, and the first pin is formed on the extending portion; The connecting portion of the first electrode is an annular sheet attached to the varistor body, the extending portion extends from the annular sheet, and the end of the extending portion is bent in a direction away from the end to form the first pin; The first pin and the second pin are respectively bent in a direction away from the end of the terminal to form a slot; The extending portion has two bends that are parallel and in opposite directions near the first pin; The second electrode is a sheet structure integrally formed. The second electrode is attached to the second side of the varistor body. A welding portion protruding away from the second side of the varistor body is bent on the second electrode, and the electrode connecting member is welded to the welding portion; the second electrode is an annular sheet.

2. A surge protector, characterized in that, The surge protector includes a carrier, an electrode connecting member, and the varistor according to claim 1; Wherein, the carrier includes a mounting plate, the mounting plate is provided with electrode through holes penetrating both sides, the varistor is mounted on the first side of the mounting plate, the electrode connecting member is mounted on the second side of the mounting plate, one end of the electrode connecting member is welded to the second electrode of the varistor through the electrode through hole, and the other end is provided with a second pin; wherein, the first pin of the varistor and the second pin on the electrode connecting member extend out of the carrier for plugging of the surge protector; The carrier is provided with a first support body and a second support body, the first support body is inserted into the slot of the first pin, and the second support body is inserted into the slot of the second pin; The surge protector further includes a tripping mechanism, the tripping mechanism is mounted on the second side of the mounting plate, and the tripping mechanism is configured such that when the electrode connecting member is welded and fixed to the second electrode, the tripping mechanism is in a first state, and when the welding between the electrode connecting member and the second electrode melts, the tripping mechanism automatically switches from the first state to a second state.

Images