CN113193543A

CN113193543A - Surge protection module and surge protection device

Info

Publication number: CN113193543A
Application number: CN202110478428.7A
Authority: CN
Inventors: 李庄; 王恒; 刘贞会; 翟春坡; 陈科企
Original assignee: Shanghai Chenzhu Instrument Co ltd; Shanghai Chenzhu Lightning Protection Technology Co ltd
Current assignee: Shanghai Chenzhu Instrument Co ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-07-30

Abstract

The invention discloses a surge protection module and a surge protection device, wherein the surge protection module comprises: the bearing frame comprises a mounting plate, and electrode through holes are formed in the mounting plate; the piezoresistor is arranged on the first side of the mounting plate and provided with a first electrode and a second electrode, and one end of the first electrode is bent to a direction departing from the tail end of the end to form a first pin with a first slot; the electrode connecting piece is arranged on the second side of the mounting plate, one end of the electrode connecting piece is welded with a second electrode of the piezoresistor through the electrode through hole, and the other end of the electrode connecting piece is bent to a direction departing from the tail end of the end to form a second pin with a second slot; the bearing frame is provided with a first supporting part and a second supporting part, the first supporting part is inserted into the first slot, and the second supporting part is inserted into the second slot. The technical scheme provided by the invention can increase the stability of the pin of the surge protection module during plugging.

Description

Surge protection module and surge protection device

Technical Field

The invention relates to the technical field of overvoltage and overcurrent protection, in particular to a surge protection module and a surge protection device.

Background

Lightning is one of ten natural disasters. With the progress of technology, the equipment is more intelligent, the integration level is higher and higher, and the equipment is more sensitive to transient overvoltage, namely surge, caused by lightning. In addition, power surges can occur when high power equipment is turned on and off. The surge protector (or surge protection device) can prevent the equipment from being damaged by the surge, and is widely applied to the industries of communication, building, rail transit, electric power, new energy, petrochemical industry and the like. When the peak current or voltage is generated in the circuit of the electric loop due to lightning stroke or external interference, the surge protector can be conducted in a very short time to discharge the current and limit the voltage to a lower level, so that damage to other equipment in the loop caused by the surge is avoided.

A common component in surge protectors used in power distribution systems is a varistor. The varistor has a very high resistance under normal operation, corresponding to an open circuit condition, and when the voltage in the circuit exceeds a predetermined value, its resistance drops sharply, being in a conductive state, allowing the magnitude of the current to be discharged, limiting the overvoltage level.

However, after a long time of use, the varistor is gradually aged, the leakage current is gradually increased, and the heat balance is broken, resulting in a continuous rise in the temperature of the product. In order to prevent the varistor from causing a fire accident due to overheating, a thermal protection tripping device is usually arranged in the surge protection device and used for disconnecting the varistor from the circuit when the temperature rises, and after the varistor is disconnected from the circuit, the surge protection device is failed, and the protection effect on equipment is lost. And the failed surge protector is provided with a state indicator to prompt maintenance personnel to replace the surge protector in time. In some unattended occasions, a remote signaling device is required to be designed to realize remote indication of the failure state of the surge protector.

At present, the existing surge protection devices are generally provided with a pin for plugging and unplugging connection, the pin is connected with an electrode of the surge protection device, and if the force is too large, the pin is skewed.

Disclosure of Invention

The invention aims to solve the problem that the pins are inclined due to overlarge force applied when the conventional surge protector is plugged.

In order to achieve the above object, the present invention provides a surge protection module including:

the electrode carrier comprises a carrier frame, wherein the carrier frame comprises a mounting plate, and electrode through holes penetrating through two sides are formed in the mounting plate;

the piezoresistor is arranged on the first side of the mounting plate and provided with a first electrode and a second electrode, and one end of the first electrode is bent to a direction departing from the tail end of the end to form a first pin with a first slot;

the electrode connecting piece is arranged on the second side of the mounting plate, one end of the electrode connecting piece is welded with the second electrode of the piezoresistor through the electrode through hole, and the other end of the electrode connecting piece is bent to a direction deviating from the tail end of the end to form a second pin with a second slot;

the bearing frame is provided with a first supporting portion and a second supporting portion, the first supporting portion is inserted into the first slot, and the second supporting portion is inserted into the second slot.

Preferably, the piezoresistor comprises a piezoresistor main body, one side of the piezoresistor main body is provided with the first electrode, and the other side of the piezoresistor main body is provided with the second electrode, wherein the first electrode is arranged on the bearing frame away from the mounting plate;

the first electrode is of an integrally formed sheet structure, the first electrode comprises a connecting part which is attached to the piezoresistor main body and an extending part which extends out of the piezoresistor main body, and the end part of the extending part forms the first pin.

Preferably, the protruding portion has two parallel and opposite bends at positions close to the first pins.

Preferably, the electrode connecting piece is integrally formed by a plate body; wherein the electrode connecting member includes a connecting body, a connecting portion formed at one end of the connecting body for welding with the second electrode of the varistor, and the second pin bent at the other end.

Preferably, the electrode connecting piece has two parallel bends with opposite directions at positions close to the second pin.

Preferably, the second electrode of the varistor is of a sheet structure, a welding portion protruding towards the electrode via hole is formed on the second electrode by bending, and the connecting portion of the electrode connecting member is attached and welded to the surface of the welding portion facing towards the electrode via hole.

Preferably, the bearing frame is provided with a mistake-proof pin for preventing the first pin and the second pin from being inserted wrongly.

Preferably, the surge protection module further comprises a tripping mechanism, the tripping mechanism is installed on the second side of the mounting plate, the tripping mechanism is set to be in a first state when the electrode connecting piece is fixedly welded with the second electrode, and when the welding between the electrode connecting piece and the second electrode is melted, the tripping mechanism is automatically switched from the first state to a second state.

According to another aspect of the present invention, there is also provided a surge protection device comprising a base and a surge protection module as described above;

the base is provided with a first pin and a second pin which are respectively corresponding to the first pin and the second pin and used for being electrically connected with a line, and the first pin and the second pin of the surge protection module are correspondingly inserted into the insertion holes;

the base is further provided with a remote signaling mechanism, the remote signaling mechanism is set to be linked with the tripping mechanism, when the tripping mechanism is in the first state, the remote signaling mechanism indicates a first state signal, and when the tripping mechanism is in the second state, the remote signaling mechanism indicates a second state signal.

According to the technical scheme provided by the invention, the first supporting part is arranged on the bearing frame and is inserted into the first slot of the first pin, and the second supporting part is inserted into the second slot of the second pin, so that the first pin and the second pin can be effectively supported, the plugging stability is improved, and the situation that the pins are inclined due to excessive force applied during the plugging process of the first pin and the second pin is avoided.

Drawings

Fig. 1 is a schematic view of a surge protection module according to an embodiment of the present invention, viewed from one side;

fig. 2 is a schematic view of the surge protection module from the other side;

fig. 3 is a schematic view of the carrier in the surge protection module from a side;

FIG. 4 is a schematic view of the loading frame viewed from the other side

FIG. 5 is a schematic view of the varistor as seen from one side;

FIG. 6 is a schematic view of the construction of the varistor as seen from the other side;

FIG. 7 is a schematic view of the structure of an electrode connection member;

fig. 8 is a schematic diagram of a trip mechanism in a surge protection module in a first state according to another embodiment of the present invention;

fig. 9 is a schematic diagram of a trip mechanism in a surge protection module in a second state;

fig. 10 is a schematic structural view of the surge protection module as viewed from the outside of the housing;

fig. 11 is a schematic view of the surge protection module plugged into the base.

Description of reference numerals:

1-a shell; 2-a bearing frame; 21-mounting a plate; 211-electrode vias; 22-a first support; 23-a second support; 24-a rotating shaft; 25-spring connection; 26-a positioning post; 27-error proof pins; 3-a voltage dependent resistor; 31-a varistor body; 32-a first electrode; 321-a connecting part; 322-first pin; 33-a second electrode; 331-a weld; 4-an electrode connection; 41-a connecting body; 42-a connecting portion; 43-pin; 44-positioning grooves; 5-a rotating member; 6-a potential storage spring; 100-a surge protection module; 200-base.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different 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 thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely 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 repetitive description will be omitted.

Furthermore, 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 embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may also be otherwise oriented, such as by rotation through 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

The present invention provides a surge protection module, as shown in fig. 1 and 2, comprising:

a carrier 2, wherein the carrier 2 comprises a mounting plate 21, and an electrode through hole 211 (refer to fig. 3 and 4) is formed on the mounting plate 21 and penetrates through two sides;

the piezoresistor 3, the said piezoresistor 3 is installed on the first side of the said mounting plate 21, the said piezoresistor 3 has first electrode 32 and second electrode 33, one end of the said first electrode 32 is bent to the direction away from this end tip to form the first pin 322 with first slot;

the electrode connecting piece 4 is installed on the second side of the installing plate 21, one end of the electrode connecting piece 4 is welded with the second electrode 33 of the piezoresistor 3 through the electrode through hole 211, and the other end of the electrode connecting piece 33 is bent towards the direction departing from the tail end of the end to form a second pin 43 with a second slot;

wherein, be provided with first supporting part 22 and second supporting part 23 on the bearing frame 2, first supporting part 22 inserts first slot, second supporting part 23 inserts the second slot.

In the technical scheme provided by the invention, the first supporting part 22 is arranged on the supporting frame 2 and is inserted into the first slot 22 of the first pin 322, and the second supporting part 23 is arranged on the supporting frame 2 and is inserted into the second slot of the second pin 43, so that the first pin 322 and the second pin 43 can be effectively supported, the plugging stability is improved, and the situation that the pins are inclined due to excessive force applied in the plugging process of the first pin 322 and the second pin 43 can be avoided.

In one embodiment of the present invention, a specific structure of the carriage 2 is shown in fig. 3 and 4, the carriage 2 includes a mounting board 21 having electrode via holes 211, and a frame disposed at a periphery of the mounting board 21, wherein a first supporting portion 22 and a second supporting portion 23 protruding outward are disposed at one side of the mounting board 21.

The carrier 2 is further provided with an error-proof pin 27 for preventing the first pin 322 and the second pin 43 from being inserted incorrectly. When the first pin 322 and the second pin 43 of the surge protection module are inserted into the corresponding sockets of the base, the error-proof pin 27 is inserted into the error-proof hole of the base. The first pins 322 and the second pins 43 are prevented from being inserted into the wrong insertion holes.

In addition, the second side of the mounting plate 21 is provided with structure for mounting a trip mechanism, which will be described in detail below in conjunction with the trip mechanism.

In this embodiment, the specific structure of the varistor 3 is as shown in fig. 5 and fig. 6, and includes a varistor main body 31, one side of the varistor main body 31 is provided with the first electrode 32, and the other side is provided with the second electrode 33, wherein the varistor 3 is mounted on a first side of a mounting plate 21, and the first electrode 32 is away from the mounting plate 21, as shown in fig. 1;

the first electrode 32 is an integrally formed sheet structure, the first electrode 32 includes a connecting portion 321 attached to the varistor main body 31 and an extending portion extending out of the varistor main body 31, and the end of the extending portion is formed with the first pin 322.

Preferably, the connecting portion 321 of the first electrode 32 is a ring-shaped sheet body which is attached to the varistor main body 31, the extending portion extends from the ring-shaped sheet body, and an end of the extending portion is bent in a direction away from the terminal to form the first pin 322.

The extension has two parallel and opposite bends, as shown at a and B in fig. 5, at locations adjacent to the first pins 322. The two parallel and opposite bending portions not only make the first pin 322 have elasticity during plugging, but also make the first pin 322 deviate from the connecting portion 321 in a direction perpendicular to the mounting plate 21 toward the first supporting portion 22, so that the first supporting portion 22 is inserted into the first insertion groove of the first pin 322.

The second electrode 33 is an integrally formed sheet structure, the second electrode 33 is attached to the second side surface of the varistor main body 31, and the second electrode 33 is preferably an annular sheet. The second electrode 33 is formed with a welding portion 332 protruding toward the electrode via hole 221 by bending, and the connecting portion 42 at one end of the electrode connecting member 4 is welded to the surface of the welding portion 332 facing the electrode via hole 211 in an attaching manner. The connection of the electrode connector 4 to the second electrode 33 through the electrode via 211 may facilitate the reduction of the thickness of the surge protection module.

In the present embodiment, the electrode connector 4 is integrally formed by a plate body, and as shown in fig. 7, the electrode connector 4 includes a connecting body 41, a connecting portion 42 formed at one end of the connecting body 41 and used for welding with the second electrode 33 of the varistor 3, and the second pin 43 bent at the other end.

Preferably, the electrode connecting member 4 has two parallel and opposite bends at positions close to the second pin 43, as shown at C and D in fig. 7. By providing the two bends, the elasticity of the second pin 43 during plugging can be increased. And the second pin 43 may be deviated in a direction perpendicular to the mounting plate 21 toward the second support part 23 than the connecting body 41 so that the second support part 23 is inserted into the second insertion groove of the second pin 43.

In order to effectively weld the connection portion 42 of the electrode connecting member 4 to the electrode of the varistor 3, an opening is provided in the connection portion 42 so that solder can enter the opening to ensure sufficient solder welding between the connection portion 42 and the varistor 3.

The connecting body 41 is provided with a positioning groove 44 or a positioning hole for positioning. When the electrode connecting piece 4 is mounted on the carrier 2 of the surge protection module, the electrode connecting piece 4 can be positioned by the positioning groove 44 or the positioning hole in cooperation with the positioning post on the carrier 2. As shown in fig. 2, the positioning slots 44 provided on the connecting body 41 cooperate with the positioning posts 26 on the carrier frame 2 to position the electrode connector 4, so as to ensure the stability of the electrode connector 4 on the carrier frame.

The surge protection module further comprises a tripping mechanism, the tripping mechanism is installed on the second side of the mounting plate 21, the tripping mechanism is set to be in a first state when the electrode connecting piece 4 is fixedly welded with the second electrode 33, and the tripping mechanism is automatically switched from the first state to a second state when the welding between the electrode connecting piece 4 and the second electrode 33 is melted.

Specifically, as shown in fig. 8 and 9, the trip mechanism includes a rotor 5 rotatably mounted on the second side of the mounting plate 21 and a potential accumulating spring 6 disposed between the rotor 5 and the carrier 2. The rotor 5 is rotatably mounted on the rotating shaft 24 of the mounting plate 21, and one end of the potential storage spring 6 is connected to the rotor 5 and the other end is connected to the spring connecting portion 25 of the carrier 2.

When the electrode connecting piece 4 and the second electrode 33 are in a welding state, the welding of the electrode connecting piece 4 and the second electrode 33 limits the rotating body 5 at a first position, and the potential storage spring 6 is kept in a compressed or stretched potential storage state; when the solder between the electrode connecting piece 4 and the second electrode 33 is melted, the potential accumulating spring 6 drives the rotating piece 5 to rotate to the second position through the elastic force, so that the electrode connecting piece 4 is separated from the second electrode 33 through the rotating piece 5.

Fig. 8 shows the position in which rotor 5 is restrained when electrode connecting element 4 and second electrode 33 are welded together, and in this case, energy storage spring 6 is in a tensioned energy storage state between rotor 5 and carrier 2, although it is also possible to arrange energy storage spring 6 in a contracted energy storage state, for example, by changing the manner in which energy storage spring 6 is mounted. When the varistor 3 is deteriorated and short-circuited, and the temperature is gradually increased to melt the solder between the second electrode 33 of the varistor and the electrode connecting member 4, the restriction of the rotor 5 is removed, and the rotor 5 is rotated about the rotating shaft 24 by the elastic force of the potential accumulating spring 6 in the stretched state from the first position to the second position, as shown in fig. 9.

It will be understood by those skilled in the art that the trip mechanism is not limited to the above-described structure in the present embodiment, and other trip mechanisms capable of changing state to isolate the electrode connector 4 from the second electrode 33 when the solder between the electrode connector 4 and the second electrode 33 melts may be provided, for example, a translation member capable of translating relative to the carrier 2 may be provided, a spring may be provided between the translation member and the carrier 2, the translation member may be limited to a first position when the electrode connector 4 and the second electrode 33 are in a welding state, the spring may be in a compressed or extended energized state, and the translation member may be moved to the welding portion between the electrode connector 4 and the second electrode 33 by the elastic force of the spring to isolate the electrode connector 4 from the welding portion of the second electrode 33 when the welding melts.

Furthermore, the surge protection module comprises a housing 1, and the carrier 2, the piezoresistor 3 and the electrode connection 4 are located in the housing 1, and the state of the surge protection module as seen from the outside is shown in fig. 10.

According to another aspect of the present invention, there is also provided a surge protection device comprising a base 200 and a surge protection module 100 as described above;

wherein, the base 200 is provided with plug holes corresponding to the first pin 322 and the second pin 43 respectively and used for electrically connecting with a line, and the first pin 322 and the second pin 43 of the surge protection module are correspondingly plugged in the plug holes;

the base 200 is further provided with a remote signaling mechanism, the remote signaling mechanism is set to be linked with the tripping mechanism, when the tripping mechanism is in the first state, the remote signaling mechanism indicates a first state signal, and when the tripping mechanism is in the second state, the remote signaling mechanism indicates a second state signal. And realizing remote indication of the failure state of the surge protection device.

The remote signaling mechanism is not the focus of the present application and those skilled in the art will appreciate that the remote signaling mechanism is implemented in various ways in the prior art and will not be described in detail herein.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. These simple modifications and combinations should be considered as the disclosure of the present invention, and all fall within the scope of the present invention.

Claims

1. A surge protection module, comprising:

the electrode connecting piece is arranged on the second side of the mounting plate, one end of the electrode connecting piece is welded with the second electrode of the piezoresistor through the electrode through hole, and the other end of the electrode connecting piece is bent to the direction departing from the tail end of the end to form a second pin with a second slot;

2. The surge protection module of claim 1 wherein the varistor comprises a varistor body having one side provided with the first electrode and another side provided with the second electrode, wherein the first electrode is mounted on the carrier away from the mounting plate;

the first electrode is of an integrally formed sheet structure and comprises a connecting portion and an extending portion, the connecting portion is connected to the piezoresistor main body in an attaching mode, the extending portion extends out of the piezoresistor main body, and the end portion of the extending portion is provided with the first pin.

3. A surge protection module according to claim 2, wherein the extension has two parallel and opposite bends at a location adjacent to the first prong.

4. The surge protection module of claim 1 wherein the electrode connector is integrally formed from a plate body; wherein the electrode connecting member includes a connecting body, a connecting portion formed at one end of the connecting body for welding with the second electrode of the varistor, and the second pin bent at the other end.

5. A surge protection module according to claim 4, wherein the electrode connection member has two parallel and oppositely directed bends at a location adjacent the second prong.

6. The surge protection module of claim 4 wherein the second electrode of the varistor is a sheet structure, the second electrode is formed with a solder portion protruding toward the electrode via by bending, and the connecting portion of the electrode connecting member is welded in abutment on a surface of the solder portion facing the electrode via.

7. The surge protection module of claim 1 wherein the carrier is provided with error-proof pins for preventing the first and second pins from being inserted in error.

8. The surge protection module of any of claims 1-7 further comprising a trip mechanism mounted on a second side of the mounting plate, the trip mechanism configured to be in a first state when the electrode connector is secured to the second electrode weld, the trip mechanism automatically transitioning from the first state to a second state when the weld between the electrode connector and the second electrode melts.

9. A surge protection device, characterized in that it comprises a base and a surge protection module according to claim 8;