A signal SPD tripping mechanism

Abstract

The present application belongs to circuit protection equipment, specifically discloses a signal SPD tripping mechanism, which is arranged on a circuit board and used for connecting a heat protection element on the circuit board and a circuit of the circuit board, comprising a tripping rod and an energy storage structure, the tripping rod is connected with the circuit of the circuit board and the heat protection element through low-temperature soldering mode; when overheating tripping, the tripping rod is pushed by the energy storage structure and disconnected with the circuit of the circuit board and the heat protection element, and a metal conductor blocked by the tripping rod is attached to a static contact disc on the circuit board. The present application realizes stable thermal tripping function for the power protection circuit integrated on the PCB circuit board through the setting of the action piece and other structures, so that the existing thermal tripping mechanism can be arranged in a thinner shell.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power protection equipment, and particularly relates to a signal SPD tripping mechanism. BACKGROUND

[0002] The tripping mechanism is an important component in the operation system to promote the automatic tripping of the switch. The circuit breaker or other power protection equipment with a switch mechanism in the closing process and in the closing position, the role of the tripping mechanism is like a force fulcrum. When the power protection equipment automatically trips, the tripping mechanism is operated by the tripping device to remove the fulcrum, so that the circuit breaker enters the free opening state. In simple terms, the lever and spring mechanism in the switch are pushed by the tripper. Once the tripper acts, the lever and spring mechanism in the switch will freely reset, that is, the switch trips. The tripper here is equivalent to the bait pin in the mousetrap.

[0003] Regardless of the type of circuit breaker, the driving force of the energy storage state, compressed air or electromagnetic driving force is mostly used. In particular, when the spring force is used for opening action, the spring is kept in a compressed energy storage state under the action of the driving force in the closing state. At this time, the mechanical hook is used to hold it to maintain the closing state. When opening, the hook is usually tripped to start the opening and breaking action, so no matter which way is taken, the start of the opening and breaking action of the circuit breaker is called tripping, and the opening and breaking action is called tripping action. Therefore, in addition to the mechanical hook tripping mode, the tripping action actually includes the action of opening the valve to discharge the compressed air or oil pressure that maintains the closing, the action of supplying the driving air pressure or oil pressure, and the action of sending pulse current to the driving electromagnetic coil. Since the energy to be handled in the last stage of the tripping action is very large, some ways require several stages of control action to complete the tripping, some ways use fluid driving force in the last stage and small spring for mechanical tripping in the initial stage, and some ways use a small air valve in the initial stage and spring driving force in the last stage.

[0004] The existing tripping mode is mostly realized by the above-mentioned way, but the above-mentioned tripping mechanism is mostly arranged in the equipment with a certain amount of installation space. If the installation space is greatly reduced compared with the prior art, the original tripping mechanism cannot be used, and the structure needs to be optimized and adjusted to realize stable tripping within a certain range in a smaller installation space. SUMMARY

[0005] In order to solve the problems existing in the prior art, the present application provides a signal SPD tripping mechanism, which aims to realize relatively stable tripping effect on the circuit board, and can alarm outwardly through shielding, linkage or display.

[0006] The technical scheme adopted by the present application is that:

[0007] The first aspect, the application discloses a signal SPD tripping mechanism, which is arranged on a circuit board and used for connecting a heat protection element on the circuit board and a circuit of the circuit board, and comprises a tripping rod and an energy storage structure, the tripping rod is connected with the circuit of the circuit board and the heat protection element through low-temperature soldering.

[0008] When overheating tripping occurs, the tripping rod is pushed by the energy storage structure and disconnected with the circuit of the circuit board and the heat protection element, and a metal conductor blocked by the tripping rod is attached to a static contact disc on the circuit board.

[0009] The tripping assembly of the application is an independent structure arranged on the circuit board, the entity circuit is integrated on the circuit board, and then part of components are connected to the circuit in the form of surface mount package, so that the original entity circuit structure is reduced, and the installation space is saved. In the traditional circuit protection device, for example, a circuit breaker or a surge protector, a plurality of functional components are arranged to form a single or multiple paths, and the circuit protection control is realized by penetrating into the main circuit. The functional components include a heat protection element, an arc extinguishing assembly, a tripping assembly and the like, and also have an entity wire structure, so that the entire device has a certain volume. For the case that a large installation space is not available, the device structure needs to be optimized and adjusted, so as to meet the installation requirements in a small space.

[0010] The integrated circuit board is one of the optimization options, most of the entity circuits are integrated in the form of a printed circuit board, the volume is greatly reduced under the premise of ensuring normal conduction current, the shell thickness is reduced from 9mm or 18mm to about 6mm, and several groups of protection devices can be additionally arranged in the original small rack arrangement space.

[0011] However, the above-mentioned device only integrates part of the device in the PCB printed circuit, and the other functional components are mechanical action mechanisms, which cannot be arranged on the PCB in the form of surface mount package. In order to realize a small occupied volume, the structure of the part of functional components needs to be adjusted.

[0012] The device in the application is connected with an external circuit through a pin, and the so-called pin is not limited to be connected or connected out. Since it is a series circuit, the whole circuit can be disconnected by disconnecting one end of the connection. The PCB in the application integrates at least two lines, one of which is a main line, and the connection end of the heat protection element is used as one end of the external line, and the heat protection element is connected in series in the main line.

[0013] The so-called heat protection element is a surge protection module including various types, including but not limited to fuse, zinc oxide varistor, discharge tube, discharge gap, inductor, TVS tube, etc. The above devices can produce certain changes when abnormal current occurs in the circuit, or the originally on circuit becomes open circuit, or the originally open circuit becomes on circuit, thereby achieving different technical effects. The trip assembly of the present application is a mechanical device for monitoring the heat protection element. When the heat protection element fails, a leakage current will occur, which will cause the module to heat up. Therefore, the thermal trip mechanism can timely disconnect the connection between the main circuit and the pin of the heat protection element, thereby avoiding other accidents caused by the failure of the heat protection element.

[0014] The present application mainly optimizes the trip mechanism and cooperates with the circuit board to achieve the corresponding effect. The so-called trip mechanism refers to the abnormal current in the originally connected circuit, which will cause the components in the trip mechanism of the protection device to change. When the abnormal current reaches a certain condition, the trip mechanism will act to disconnect the internal circuit, thereby protecting the connected circuit by forming an open circuit. The difference from the prior art is that the present application cooperates with the heat protection element and the printed circuit to form a sheet structure between the pin and the heat protection element, which can slide on the circuit board. The sheet structure is a trip lever (the trip lever only refers to the structure and does not limit its specific shape to a rod).

[0015] A storage structure is also provided on one side of the trip lever, which is fixed on the circuit board. The storage structure is a mechanical structure including external function drive and internal potential energy drive. In the initial state, it can always give the trip lever a pushing force or other actuating force. When the storage structure is excited, the trip lever will act. At this time, the trip lever has only one direction of movement, i.e. towards the direction of disconnecting the circuit of the circuit board from the heat protection element. This makes the series discharge path of the external circuit through the heat protection element open circuit. The trip lever can also directly push the heat protection element to lose connection with the circuit board. It should be noted that for those skilled in the art, according to the inventive concept of the present application, it can be further confirmed that setting a separate storage structure for the trip lever to push the connecting piece or directly push the heat protection element can also achieve the corresponding effect. However, the cost and difficulty of the above two ways are higher in technical implementation, so they are generally not used.

[0016] The so-called low-temperature tin solder connection is a common thermal trip connection relationship in the art, also including any connection mode having the characteristic of structural change under heat, generally speaking, as long as a low-melting-point material maintains a fixed state at room temperature, connects the circuit of the circuit board and the heat protection element, if the abnormal heat is released, the temperature rises to a certain threshold, and then melts to cause the connection stability to rapidly decrease, then the corresponding thermal trip effect can be achieved. The trip lever with an external force applied all the time will drive the connecting body to move to make the pin lose connection with the heat protection element.

[0017] It is worth mentioning that the so-called conductive end is a conductive structure provided on the trip lever, generally made of metal material, and other solid structures with relatively stable thermal stability can also be used as substitutes.

[0018] It is also worth mentioning that the circuit board of the present application also has a branch, which is also integrated on the circuit board and has a static contact pad on the circuit board. The so-called static contact pad is a large-area conductive area on the circuit board, which is connected with the external conductor by welding or direct bonding. The circuit protection device to which the trip assembly of the present application is applied has only one series circuit: the main circuit. The branch is a standby circuit, which is not connected to any external circuit in the initial state and is connected only after the trip lever moves.

[0019] Since the core functional component of the entire circuit protection device is the heat protection element, the trip assembly cuts off the circuit to avoid other subsequent accidents after the heat protection element fails and deteriorates. However, in many important devices, especially in communication base stations set in remote areas, if the heat protection element abnormally trips after heat, the circuit cannot be restored in time. If the access circuit is disconnected, it will cause a large area of communication equipment to be paralyzed, seriously affecting the communication safety in the area, and the loss caused is huge. Since maintenance personnel cannot reach the site in time, even if an alarm device is provided, the consequences of power failure between maintenance and reset cannot be tolerated. Therefore, the branch is a separate circuit, which can be replaced by other protection devices or a new heat protection element to achieve the effect of protection. Even if no protection device is set on the branch, the circuit can be kept open during the fault alarm and maintenance, thereby avoiding greater losses. This technical point is different from the prior art and can be applied in circuit breakers and surge protectors, and the surge protector will be provided in parallel with multiple ones, and when one deteriorates and alarms, the remaining protectors can also have a protection effect.

[0020] The so-called thermal trip refers to the state of the low-temperature tin solder part between the conductive end of the trip lever and the connection position of the two structures after being heated and disconnected. Since the trip lever is a movable part, it will be immediately actuated by the energy storage structure when it loses the limit connection.

[0021] In combination with the first aspect, the present application provides a first implementation of the first aspect, wherein the trip lever is provided with an isolation plate, which blocks the metal conductor from contacting the static contact disc when the trip lever is not tripped.

[0022] It should be noted that the isolation plate is integrally connected with the trip lever or is an insulating structure fixed on one end of the trip lever. The isolation plate has a certain surface area, which can effectively block the contact between the metal conductor and the static contact disc. In the initial state, the metal conductor is limited, and once the action is taken, the isolation plate is displaced, the circuit on the circuit board is disconnected from the heat protection element, but the metal conductor is connected with the static contact disc at the same time, thereby forming a linkage mechanism for replacing the circuit. It should be noted that the isolation plate is a fixed structure, and its mechanism is to create a space when it is displaced, and the metal conductor has a tendency to adhere to the static contact disc. This tendency can be an external force provided by other components, or by setting a suitable material structure, so that the metal conductor has internal stress for a long time, thereby providing the tendency.

[0023] In combination with the first implementation of the first aspect, the present application provides a second implementation of the first aspect, wherein the metal conductor is an elastic contact piece having elasticity, and the circuit board is provided with a contact piece pad, one end of the elastic contact piece is connected to the surface of the contact piece pad, and the other end is crimped to the surface of the isolation plate.

[0024] In combination with the first aspect and the first and second implementations of the first aspect, the present application provides a third implementation of the first aspect, wherein the trip lever is further provided with a thermal trip metal sheet, and the thermal trip metal sheet is connected with the circuit on the circuit board and the heat protection element by low-temperature tin soldering.

[0025] In combination with the third implementation of the first aspect, the present application provides a fourth implementation of the first aspect, wherein the heat protection element is fixed on the circuit board and has a primary electrode pad on the circuit board, and a secondary electrode pad of the circuit on the circuit board is provided on one side of the primary electrode pad, and the thermal trip metal sheet is connected with the primary electrode pad and the secondary electrode pad.

[0026] In combination with the first aspect and the first and second implementations of the first aspect, the present application provides a fifth implementation of the first aspect, wherein the trip lever is further provided with a magnet, and a Hall sensor for detecting the position of the magnet is provided on the circuit board.

[0027] In combination with the first aspect and the first and second implementations of the first aspect, the present application provides a sixth implementation of the first aspect, wherein the circuit board has an identification light hole, and the trip lever blocks the light path of the identification light hole when tripped.

[0028] Specifically, the tripping lever structure is attached to the surface of the circuit board and slides along the plane of the surface thereof, compared with the existing thermal tripping mechanism, the tripping lever can be set in a shell of 6mm or less in thickness by reducing the thickness and increasing the width to ensure a certain structural strength, and can be set in a shell of 6mm or less in thickness. Unlike the remote signaling module, due to the use of a thinner structure design, the circuit protection device using the tripping assembly is arranged side by side, which can constitute series protection for a single line or protection for multiple lines, and each device is provided with an independent identification light hole. When arranged side by side, all the identification light holes are aligned to form a through channel, and a light source is arranged through the channel on both sides of the channel. Once blocked, one or more tripping levers act, and the external detection circuit will first feedback externally and timely handle.

[0029] In combination with the first aspect and the first and second embodiments of the first aspect, the present application provides a seventh embodiment of the first aspect, the tripping lever further has a tripping display surface which is exposed and displayed when thermal tripping occurs.

[0030] In combination with the first aspect and the first and second embodiments of the first aspect, the present application provides an eighth embodiment of the first aspect, the tripping lever has a guide rod, and the energy storage structure is a spring sleeved on the guide rod, and the other end of the spring is fixedly connected with the circuit board.

[0031] In combination with the first aspect and the first and second embodiments of the first aspect, the present application provides a ninth embodiment of the first aspect, the tripping lever further has a guide groove, and the sliding limiting is realized by cooperation of the guide groove and the external protruding structure.

[0032] It is worth noting that the guide groove and the convex guide rail are mutually sliding cooperation members, which are designed to limit the tripping lever to reciprocate in a fixed direction. The convex guide rail is generally arranged on the shell structure for protecting the circuit board, and can also be arranged on the circuit board.

[0033] The beneficial effects of the present application are:

[0034] (1) The present application provides stable thermal tripping function for the power protection circuit integrated on the PCB circuit board by setting the action piece and other structures, so that the tripping lever can be arranged in a thinner shell compared with the existing thermal tripping mechanism.

[0035] (2) The present application forms a standby branch by cooperation of the pin or separately arranged elastic contact piece with the static contact disc on the circuit board, the main circuit is disconnected and the current is introduced into the branch when the action piece acts under the shielding of the insulating part on the action body under normal state, so that the main circuit can be disconnected after sending the fault alarm. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing;

[0037] Figure 2 is a first axial side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the thermal tripping state;

[0038] Figure 3 is a second axial side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the thermal tripping state;

[0039] Figure 4 is a side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the connecting state;

[0040] Figure 5 is a first axial side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the connecting state;

[0041] Figure 6 is a second axial side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the connecting state;

[0042] Figure 7 is a schematic axial side view of the trip lever in the embodiment 1 of the present application;

[0043] Figure 8 is a side view of the trip lever in the embodiment 1 of the present application;

[0044] Figure 9 is a schematic axial side view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the thermal tripping state;

[0045] Figure 10 is a front view of the trip unit in the embodiment 1 of the present application, in which the trip unit is arranged in the housing and in the thermal tripping state.

[0046] In the figure: 1 - circuit board, 2 - TVS tube, 3 - spring, 4 - static contact disc, 5 - Hall sensor, 6 - elastic contact sheet, 7 - contact sheet pad, 8 - convex guide rail, 9 - guide groove, 10 - trip display surface, 11 - trip display window, 12 - magnet, 13 - trip lever, 14 - guide rod, 15 - thermal tripping metal sheet, 16 - primary electrode pad, 17 - secondary electrode pad, 18 - isolation plate. DETAILED DESCRIPTION

[0047] The present application is further explained in conjunction with the accompanying drawings and specific embodiments.

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0050] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0051] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear in the description of the present application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] In addition, if the terms "horizontal", "vertical" and the like appear in the description of the present application, they do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0053] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiments

[0054] This embodiment discloses a signal SPD tripping mechanism used in a surge protector. The surge protector includes two housings and a base that slide and plug into each other. The base has multiple terminals for connecting to external circuits. The housings are of a split structure, including a main body and a cover plate that snaps onto one side of the main body. The main body has a recessed groove with a thickness of less than 6 mm, and a circuit board 1 is installed in the groove to fill it.

[0055] like Figures 1-10 As shown in the figure, the circuit board 1 structure is housed within the housing. The circuit board 1 has an irregular shape and is fixed to the housing body by bolts. Multiple rectangular openings are located at the bottom of the housing for multiple pins on the circuit board 1 to pass through. When the housing is connected to the base, these pins correspond to sockets on the base.

[0056] The circuit board 1 has a protection circuit, including a main circuit and a branch circuit. The main circuit is equipped with a heat protection element. In this embodiment, the heat protection element is a TVS tube 2 that is fixedly connected to the circuit board 1 by surface mount technology.

[0057] The main circuit on circuit board 1 is used to discharge instantaneous overload current in the connected circuit, thereby protecting the connected circuit. Normally, the TVS diode 2 on the main circuit is open-circuited. However, if it deteriorates or fails, leakage current will exist in the main circuit. Continuous leakage current will cause the entire protection device to overheat. If the fault cannot be eliminated in time, there will be a fire hazard.

[0058] To improve safety and stability, a tripping assembly is provided on circuit board 1. This tripping assembly includes a tripping lever 13 and an energy storage structure. The energy storage structure continuously provides the tripping lever 13 with a force that guides its directional movement on circuit board 1. The thermal protection element is connected to the circuit of circuit board 1 (i.e., the external circuit introduced from the pins) and the connection is made by low-temperature soldering at the connection point.

[0059] Further, the trip bar 13 is also provided with a metal conductor, which is the thermal trip metal sheet 15 shown in the figure, the circuit board 1 is provided with a secondary electrode pad 17 connected with the internal circuit, and the TVS tube 2 is provided with a primary electrode pad 16, the thermal trip metal sheet 15 is connected with the primary electrode pad 16 and the secondary electrode pad 17 by low-temperature soldering, thereby forming a complete series circuit containing the TVS tube 2. The current entering the SPD will pass through the thermal trip metal sheet 15 and the heat protection element, and flow to another pin from the main circuit, thereby achieving the effect of current leakage. When there is a continuous leakage current, the conductors on the entire circuit will heat up, and the TVS tube 2 is the main heating device, the low-temperature solder near the connection of the device will melt at a certain temperature, when the adhesion is less than the thrust provided by the trip bar 13, the trip bar 13 will quickly act and cause the connection body to be disconnected from the TVS tube 2, that is, the main circuit is disconnected.

[0060] Further, the circuit board 1 in the embodiment is also provided with a branch circuit, which exists as a backup connection after the main circuit thermal trip is disconnected, the branch circuit can also be provided with a heat protection element, and a metal static contact disc 4 is left on the circuit board 1. A resilient contact sheet 6 connected with the circuit of the circuit board 1 is provided near the metal static contact disc 4, which is blocked by a separation plate 18 belonging to the trip bar 13 when the main circuit is in a connected state, and cannot contact the static contact disc 4. The resilient contact sheet 6 is not linked with the trip bar 13, so when the trip bar 13 acts, the intermediate separation plate 18 will also move to another position, at this time, the resilient contact sheet 6 loses the blockage and moves towards the side of the circuit board 1 with the static contact disc 4 due to its own elasticity, and finally adheres to the static contact disc 4, thereby forming a path for the branch circuit of the circuit board 1.

[0061] The branch circuit and the main circuit are in parallel or two independent circuits, since the base is provided with multiple terminal connectors, multiple outgoing terminals can be provided, the outgoing terminals of the main circuit and the branch circuit can be the same or different, for example, the branch circuit is also provided with a backup heat protection element, so the outgoing terminals of the main circuit and the branch circuit are the same, when the heat protection element on the main circuit is disconnected, the current continues to leak from the branch circuit. At this time, the trip bar 13 can be provided in a two-section structure, when the connection body of the main circuit is disconnected, the trip bar 13 acts and abuts against the connection body of the heat protection element of the branch circuit. At the same time, two or more alarm devices are provided on the circuit board 1, which can send an alarm signal to the outside after a single action of the trip bar 13 by itself or in cooperation with external devices. At this time, the existence of the branch circuit can provide more generous on-site maintenance time, and is suitable for use in communication equipment protection systems in remote areas or unattended areas.

[0062] Further, in order to better illustrate the specific structure, as shown in Figures 1-10As shown, the cover plate on one side of the shell is removed, and the internal circuit board 1 structure is exposed. It can be seen that only the structure components related to the tripping mechanism exist on the circuit board 1 in the figure, and the electronic devices originally present on the circuit board 1 are not shown to avoid the disclosure of other irrelevant technologies.

[0063] It can be seen that the tripping lever 13 shown in the figure is a sliding member structure, and a convex guide rail 8 is arranged on the inner wall of the shell or the circuit board 1, and the tripping lever 13 has a guide groove 9 matched with the convex guide rail 8, and the linear motion limiting effect of the tripping lever 13 is realized by the cooperation of the guide groove 9 and the convex guide rail 8.

[0064] The energy storage structure arranged on the other side is a guide rod 14 with a spring 3, one end of the guide rod 14 is connected to the tripping lever 13, and at this time the spring 3 is compressed to form a rightward pushing trend of the tripping lever 13. The lower side of the tripping lever 13 is a TVS tube 2 as a heating protection element, which is connected to the tripping lever 13 through the right connecting body.

[0065] Among them, Figure 5 and Figure 6 The tripping lever 13 is in a normal state, and Figure 2 and Figure 3 is the state after the tripping lever 13 has acted. At this time, the exposed elastic contact piece 6 structure can be seen, and the elastic contact piece 6 is originally connected to the connecting body through the conductor built in the tripping lever 13, which can be a fixed structure or an independently arranged metal flexible wire, only as a connecting conductor. After the tripping lever 13 moves to the right, the elastic contact piece 6 is attached to the circuit board 1 and connected to the two static contact discs 4 of the circuit board 1. The static contact disc 4 can be connected to the outgoing end pin or the incoming end pin through the printed circuit on the circuit board 1, and the elastic contact piece 6 can also be connected to the two pins through the entity or the printed circuit.

[0066] Further, in the present embodiment, the tripping lever 13 also has a shielding part, and a circular identification light hole is arranged on the shell for the external light path to pass through. If the tripping lever 13 does not act, the identification light hole is in a through state at this time, and external light can pass directly, and when the tripping lever 13 acts, the shielding part will block the light path, thereby generating a change signal in the first time and informing the external system that the surge protector has acted.

[0067] Further, the tripping lever 13 in the present embodiment also has a circular mounting seat, a magnet 12 is embedded in the mounting seat, and a Hall sensor 5 is arranged on the corresponding position of the circuit board 1, which can detect the position change of the magnet 12 and send a warning to the outside through the internal remote signaling circuit.

[0068] Further, a trip display surface 10 is also provided on the side end surface of the trip lever 13. The trip display surface 10 is a surface with a color or other feature having a prominent pattern. The housing has a trip display window 11, which has an opening and a cover plate of transparent material provided on the opening. When the trip lever 13 is actuated, the display feature originally in the trip display window 11 changes significantly, so that the maintenance personnel on site can quickly find the corresponding fault module among the multiple SPD modules arranged side by side to perform maintenance and replacement.

[0069] It is worth noting that the circuit board 1 of the entire housing is connected to the external circuit through the provided pin in the illustration of the embodiment. The pin is only used to achieve electrical connection between the circuit board 1 of the entire housing and the external base during assembly. The internal elastic contact piece 6 is a conductor structure that can be connected to the external circuit entered by the pin (the connection method can be various, which will be determined according to the actual setting position of the trip lever 13 and the heat protection element, for example, directly connected with the pin or integrated, for example, provided on the circuit board 1 and connected with the pin through the printed circuit on the circuit board 1, thereby facilitating flexible arrangement, or the static contact disc 4 is connected with the pin, and the elastic contact piece 6 is connected with other connection end of the circuit of the circuit board 1 through the contact piece pad 7). Due to the structural characteristics of the metal sheet, it can be bent to a certain extent on the circuit board 1 (it can also be a movable piece, but since the elastic contact piece 6 itself has a certain elasticity, it directly utilizes the material characteristics thereof). In the initial state, the trip lever 13 is connected with the heat protection element due to the existence of the low-temperature soldering connection, and the elastic contact piece 6 and the static contact disc 4 are separated by the isolation plate 18. Embodiment

[0070] The embodiment discloses a signal SPD trip mechanism applied in a surge protector. The same as the embodiment 1 is that the surge protector has two parts of a housing and a base, and the thicknesses of the two parts are both 6 mm, which are lower than the conventional thicknesses of 9 mm and 18 mm of the existing circuit breaker.

[0071] The circuit board 1 trip device is also provided in the SPD, and the circuit board 1 is further simplified to show an independent structure. The circuit board 1 has a pin, and the pin is directly connected with an elastic contact piece 6 structure. The circuit board 1 also has an ultra-thin trip lever 13. The trip lever 13 has a guide groove 9 in the middle, which cooperates with a convex guide rail 8 on the circuit board 1 to realize movement limiting in the up-down direction.

[0072] And the trip bar 13 also has a protruding thin plate structure, which is the isolation plate 18, in the normal state, the elastic contact piece 6 is blocked by the isolation plate 18, so as to limit the contact with the metal static contact disc 4 provided on the circuit board 1, and the static contact disc 4 is the same as that in embodiment 1, which is a branch on the circuit board 1. The connecting body on the left side of the trip bar 13 moves upward at the same time after the trip bar 13 acts, so that the originally connected heat protection element with the elastic contact piece 6 or the pin is disconnected. At the same time, the circular shielding piece at the upper end of the trip bar 13 and the protruding trip display end act at the same time, the shielding piece shields the identification light hole on the circuit board 1, blocks the external detection light path to form an alarm signal. And the protruding trip display end can quickly find the already acting part in the multiple surge protectors arranged in parallel, so that the shell can be directly disassembled and replaced.

[0073] The energy storage structure in the embodiment is the spring 3 between the pin and the elastic contact piece 6 and the guide rod 14, the spring 3 gives the guide rod 14 an acting force, and the guide rod 14 directly abuts against the trip bar 13, always giving the trip bar 13 an upward sliding thrust. Embodiment

[0074] The embodiment has a similar structure design as that in embodiment 2, and discloses a circuit board 1 trip assembly. It can be seen that the heat protection element on the circuit board 1 is fixed on the circuit board 1 by means of low-temperature soldering, and the trip bar 13 directly abuts against one side of the heat protection element. If the low-temperature soldering connecting body at the connection between the heat protection element and the circuit board 1 is fused, the heat protection element will be pushed upward by the trip bar 13 to achieve the disconnection effect.

[0075] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application. The above-mentioned specific embodiments should not be understood as limiting the protection scope of the present application, and the protection scope of the present application should be defined by the claims, and the specification can be used to explain the claims.

Claims

1. A signal SPD tripping mechanism, disposed on a circuit board (1) and used to connect a heat protection element on the circuit board (1), the circuit board (1) having a protection circuit, the protection circuit including a main circuit and a branch circuit, wherein the main circuit is provided with a heat protection element; characterized in that: It includes a trip lever (13) and an energy storage structure. The trip lever (13) has a conductive end, which is connected to the main circuit and heat protection components of the circuit board (1) by low-temperature soldering. The tripping rod (13) is provided with an isolation plate (18). When it is not tripped, the isolation plate (18) blocks the metal conductor and the stationary contact plate (4). The metal conductor is an elastic contact piece (6) with elasticity. A contact pad (7) is provided on the circuit board (1). One end of the elastic contact piece (6) is connected to the surface of the contact pad (7), and the other end is pressed against the surface of the isolation plate (18). When overheating trips, the tripping rod (13) is pushed by the energy storage structure and disconnects from the main circuit and heat protection element of the circuit board (1). At the same time, the metal conductor blocked by the tripping rod (13) is in contact with the static contact plate (4) on the circuit board (1). The branch circuit exists as a backup connection after the main circuit is thermally tripped. The branch circuit is also equipped with a backup heat protection element. The branch circuit has a metal static contact plate (4) on the circuit board (1). Near the metal static contact plate (4), there is an elastic contact piece (6) connected to the branch circuit on the circuit board (1). When the main circuit is in a connected state, the elastic contact piece (6) is blocked by the isolation plate (18) belonging to the trip rod (13) and cannot contact the static contact plate (4). The leads of the main circuit and the branch circuit are the same. When the heat protection element on the main circuit fails and the main circuit is disconnected, the current continues to flow from the branch circuit. When the trip lever (13) is activated, the middle isolation plate (18) will also move to other positions. At this time, the elastic contact piece (6) that is no longer blocked will move towards the side of the circuit board (1) with the stationary contact plate (4) due to its own elasticity, and finally stick to the stationary contact plate (4), thereby forming a passage for the branch of the circuit board (1).

2. The signal SPD tripping mechanism according to claim 1, characterized in that: The tripping rod (13) is also provided with a thermal tripping metal sheet (15), which is connected to the main circuit of the circuit board (1) and the heat protection element by low-temperature soldering.

3. The signal SPD tripping mechanism according to claim 2, characterized in that: The heat protection element of the main circuit is fixed on the circuit board (1). The circuit board (1) has a primary electrode pad (16) and a secondary electrode pad (17) of the main circuit of the circuit board (1) is provided on one side of the primary electrode pad (16). The heat-release metal sheet (15) is connected to both the primary electrode pad (16) and the secondary electrode pad (17).

4. The signal SPD tripping mechanism according to claim 1, characterized in that: The trip lever (13) is also provided with a magnet (12), and a Hall sensor (5) for detecting the position of the magnet (12) is provided on the circuit board (1).

5. The signal SPD tripping mechanism according to claim 1, characterized in that: The circuit board (1) has an identification light hole, and the tripping rod (13) blocks the light path of the identification light hole when the circuit is thermally tripped.

6. The signal SPD tripping mechanism according to claim 1, characterized in that: The trip lever (13) also has a trip display surface (10), which is exposed during hot tripping.

7. The signal SPD tripping mechanism according to claim 1, characterized in that: The tripping rod (13) has a guide rod (14), and the energy storage structure is a spring (3) sleeved on the guide rod (14). The other end of the spring (3) is fixedly connected to the circuit board (1).

8. The signal SPD tripping mechanism according to claim 1, characterized in that: The release lever (13) also has a guide groove (9), which cooperates with the external protrusion structure to achieve sliding limit.

Images