Lightning protection module

Abstract

The utility model relates to the technical field of functional electronic modules, in particular to a lightning protection module, which overcomes the defects of insufficient arc extinguishing, unsmooth sliding of a sliding block and the like of the conventional lightning protection module, and is provided with a shell, a frame, a piezoresistor component, a reed electrode and a tripping mechanism, the frame is provided with a chip cavity for accommodating the piezoresistor component and a tripping cavity for accommodating the tripping mechanism, the chip cavity and the tripping cavity are separated by an inner plate, and the inner plate is provided with a through hole for allowing the main electrode of the piezoresistor component to be welded and connected with the reed electrode. The sliding block separates and separates the reed electrode from the main electrode under the action of the spring, the moving direction of the sliding block serves as the front, the face, facing the reed electrode, of the sliding block serves as the top face, the face, facing the inner plate, of the sliding block serves as the bottom face, a plurality of arc extinguishing grooves are formed in the end face, entering and penetrating through a welding flux fusing area, of the sliding block, and the arc extinguishing grooves extend to the bottom face of the sliding block. And arc generated when the reed electrode is disconnected from the main electrode is extinguished by the groove body and the groove cavity of the movable arc extinguishing groove.

Description

Technical Field

[0001] The utility model relates to the technical field of functional electronic modules, in particular to a lightning protection module. Background Technique

[0002] The lightning protection module is also called a surge protector or a thermal protection type varistor. Generally, it includes a housing, a varistor component, a reed electrode, a slider, a frame, a spring and a low melting point alloy. The simple working process is that when the varistor is overvoltage and generates heat, the low melting point alloy melts, and the slider separates the reed electrode and the low melting point alloy under the action of the spring force, so that the circuit is disconnected.

[0003] The existing thermal protection type varistors generally have the following problems: First, as disclosed in a surge protector arc extinguishing mechanism with the Chinese patent publication number CN206524626U, an arc extinguishing grid is arranged on the box body, and it is stated that the arc extinguishing grid has an arc extinguishing effect on the arc formed when the solder melts and the elastic piece is disconnected from the pin. However, the arc extinguishing grid is fixedly arranged on the box body wall far away from the arc generation area, and the arc extinguishing effect on the arc between the elastic piece and the pin is limited, which affects the full disconnection between the elastic piece and the pin. Second, as disclosed in a thermal protection type varistor and its surge protector with the Chinese patent publication number CN 211908358U, as shown in the attachment Figure 3 Since the boss of the main electrode piece of the varistor needs to penetrate through the square hole of the frame, the main electrode piece of the varistor is directly attached to the frame. In this case, due to the heat generated by the varistor, the plastic frame will be deformed. When the frame is deformed, the slide rail will be deformed, resulting in the slider getting stuck during sliding, so that the tripping mechanism cannot trip normally. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a lightning protection module, which overcomes the defects of insufficient arc extinguishing of the existing lightning protection module and poor sliding of the slider caused by heat deformation of the frame.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a lightning protection module, comprising a shell, a frame, a varistor component and a reed electrode, and also comprising a tripping mechanism including a slider and a spring, wherein the frame comprises a chip cavity for accommodating the varistor component and a tripping cavity for accommodating the tripping mechanism, the chip cavity and the tripping cavity are separated by an inner plate of the frame, and a through hole is provided on the inner plate to allow the main electrode of the varistor component in the chip cavity to be welded and connected with the reed electrode in the tripping cavity, when the solder at the welding connection between the reed electrode and the main electrode melts, the slider moves under the action of the spring to disconnect and block the reed electrode from the main electrode, and the slider is used to move the reed electrode The direction of movement when the electrode is disconnected from the main electrode is forward, the surface of the slider facing the reed electrode is the top surface of the slider, and the surface facing the inner plate is the bottom surface of the slider. A number of arc extinguishing grooves are provided on the end surface of the slider that enters and passes through the solder melting area, and the arc extinguishing grooves extend to the bottom surface of the slider; the lightning protection module extinguishes the arc formed when the reed electrode is disconnected from the main electrode by the groove body and groove cavity of the movable arc extinguishing groove. Because the lightning protection module will generate an arc when it is subjected to high voltage, the arc will still exist when the slider has not moved to the front, and the arc needs to be extinguished by the arc extinguishing groove on the slider to reduce the impact caused by the arc.

[0006] Specifically, in order to prevent the frame from deforming due to the heating of the varistor component, at least two bosses are distributed on the wall of the chip cavity on the inner plate of the frame, and the bosses form a tolerant space between the varistor component and the inner plate when the varistor component heats and deforms.

[0007] Specifically, the chip cavity is filled with insulating glue for insulating and encapsulating the main body of the varistor component, and a concave glue channel is provided on the board wall of the chip cavity on the inner board of the frame, and the glue channel helps the flow of the insulating glue during pouring.

[0008] Specifically, the rubber paths include at least two rubber paths in the front-to-back direction that are spaced apart and at least two rubber paths in the left-to-right direction that are spaced apart.

[0009] Specifically, the top surface of the slider has a working wedge surface located below the reed electrode and inclined forward and downward for facilitating the lifting of the reed electrode.

[0010] Specifically, in order to position the spring and cover a portion of the metal spring close to the arc, the spring is a compression spring, the rear end of the spring is pressed against the frame and the front end is pressed against the slider, the slider has a spring groove with an opening toward the bottom surface, and at least a portion of the spring is located in the spring groove.

[0011] Specifically, there are two springs, and there are two spring slots arranged on the slider at intervals on the left and right sides.

[0012] The beneficial effects of the present utility model are as follows: For the lightning protection module of the present utility model, an arc extinguishing groove for disconnecting the arc between the extinguishing reed electrode and the main electrode is provided on the moving slider. The arc extinguishing groove can track the arc point and extinguish the arc, having a good arc extinguishing effect. Further, a boss is provided on the inner plate to prevent the frame from being deformed by heat and / or a glue channel is provided on the inner plate to improve the pouring fluidity of the insulating glue. Description of the Drawings

[0013] Figure 1 is a perspective view of the present utility model;

[0014] Figure 2 is a perspective view of the present utility model after removing the outer shell;

[0015] Figure 3 is a perspective view of the varistor component in the present utility model;

[0016] Figure 4 is a perspective view of the frame in the present utility model with the chip cavity facing upward;

[0017] Figure 5 is a perspective view of the frame in the present utility model with the tripping cavity facing upward;

[0018] Figure 6 is a perspective view of the slider in the present utility model with the top surface facing upward;

[0019] Figure 7 is a perspective view of the slider in the present utility model with the bottom surface facing upward;

[0020] Figure 8 is a longitudinal sectional view of the present utility model at the welding joint of the reed electrode and the main electrode.

[0021] In the figures: 1. Outer shell;

[0022] 2. Frame, 2-1. Chip cavity, 2-2. Tripping cavity, 2-3. Inner plate, 2-3-1. Through hole, 2-3-2. Boss, 2-3-3. Glue channel, 2-3-4. Slide rail, 2-4. Limit block;

[0023] 3. Varistor component, 3-1. Main electrode;

[0024] 4. Reed electrode;

[0025] 5. Slider, 5-1. Arc extinguishing groove, 5-2. Working wedge surface, 5-3. Spring groove;

[0026] 6. Spring. Detailed Implementation Manner

[0027] The present utility model will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, and thus only showing the components related to the present utility model.

[0028] The attached Figure 1 shows the shape of the present utility model from the outside. The attached Figure 8 is a sectional view capable of showing the main internal structure. The internal structure also needs to be comprehensively understood in combination with the schematic diagram of the attached Figures 2 to 7 ; see the attached Figure 2 is the three-dimensional shape of the lightning protection module after removing the outer shell 1. The module has an outer shell 1, a frame 2, a varistor component 3, and a reed electrode 4, and also has a tripping mechanism including a slider 5 and a spring 6. The frame 2 has a chip cavity 2-1 for accommodating the varistor component 3 and a tripping cavity 2-2 for accommodating the tripping mechanism. The shape of the varistor component 3 can be seen in the attached Figure 3 , the shape of the chip cavity 2-1 can be seen in the attached Figure 4 , and the shape of the tripping cavity 2-2 can be seen in the attached Figure 5 ; see the attached Figure 8 , the chip cavity 2-1 and the tripping cavity 2-2 are separated by the inner plate 2-3 of the frame 2. A through hole 2-3-1 is provided on the inner plate 2-3 to allow the main electrode 3-1 of the varistor component 3 in the chip cavity 2-1 to be welded to the reed electrode 4 in the tripping cavity. When the solder at the welded joint of the reed electrode 4 and the main electrode 3-1 melts, the slider 5 moves under the action of the spring 6 and disconnects and isolates the reed electrode 4 from the main electrode 3-1. Taking the direction in which the slider 5 moves when disconnecting the reed electrode 4 from the main electrode 3-1 as the front, the surface of the slider 5 facing the reed electrode 4 is the top surface of the slider 5, and the surface facing the inner plate 2-3 is the bottom surface of the slider 5. A plurality of arc extinguishing grooves 5-1 are provided on the end surface of the slider 5 entering and passing through the solder melting area, and the arc extinguishing grooves 5-1 extend to the bottom surface of the slider 5. The structure of the slider 5 can be seen in the attached Figure 6 and the attached Figure 7 . The illustrated arc extinguishing grooves 5-1 are rectangular grooves. In this way, the shape at the arc extinguishing grooves 5-1 is in a grid shape. The arc extinguishing grooves 5-1 can also be triangular grooves. In this way, the shape at the arc extinguishing grooves 5-1 is in a serrated shape. The lightning protection module extinguishes the arc formed when the reed electrode 4 is disconnected from the main electrode 3-1 by the groove body and the groove cavity of the moving arc extinguishing grooves 5-1.

[0029] Two hemispherical bosses 2-3-2 are distributed on the plate wall of the inner plate 2-3 of the frame 2 in the chip cavity 2-1. Two annular bosses 2-3-2 are also provided at intervals inside and outside the outer circle of the through hole 2-3-1. The bosses 2-3-2 form a variable space when the varistor component 3 heats up and deforms between the varistor component 3 and the inner plate 2-3.

[0030] The chip cavity 2-1 is filled with insulating glue for insulating and encapsulating the main body of the varistor component 3. The main body of the varistor component 3 refers to the main part of the varistor component 3 after removing the extended pins. In order not to affect the display of other structures, the attached Figure 8 There is no illustration of the insulating glue, and an inwardly concave glue channel 2-3-3 is provided on the wall of the chip cavity 2-1 on the inner plate 2-3 of the frame 2. The glue channel 2-3-3 helps the flow of the insulating glue during injection. Since the insulating glue has a strong deformation ability, the thermal deformation of the varistor component 3 is not greatly affected even if the insulating glue is injected into the aforementioned variable space.

[0031] The rubber path 2-3-3 includes two longitudinal rubber paths in the front-to-back direction and three transverse rubber paths in the left-to-right direction. The cross section of the rubber path 2-3-3 is an inwardly concave arc.

[0032] Still see attached Figure 6 The top surface of the slider 5 has a working wedge surface 5-2 located below the reed electrode 4 and inclined forward and downward for easily lifting the reed electrode 4 upward.

[0033] Spring 6 is a compression spring, combined with the attached Figure 2 and attached Figure 6 The rear end of the spring 6 is supported on the frame 2, and the front end is supported on the slider 5. The slider 5 has a spring groove 5-3 with an opening toward the bottom surface. A part of the spring 6 is located in the spring groove 5-3. Figure 2 Most of the spring 6 is covered by the slider 5, and the slider 5 can also cover all of the spring 6. In order to balance the force on the slider 5, there are two springs 6, and the spring grooves 5-3 are two arranged on the slider 5 at intervals on the left and right.

[0034] The inner plate 2-3 is located on the wall of the tripping cavity 2-2 and is provided with a slide rail 2-3-4 for positioning and guiding the slider 5. The slide rail 2-3-4 and the slider 5 are provided with mutually engaging anti-dropping protrusions and anti-dropping grooves, such as Figure 6 As shown, an anti-slip protrusion for hooking the slide rail 2-3-4 is provided on the slide block 5, and correspondingly, an anti-slip groove for accommodating the anti-slip protrusion is provided on the slide rail 2-3-4.

[0035] like Figure 2 and Figure 5 As shown, a limit block 2-4 is provided on the frame 2 at a position in front of the slider 5. The limit block 2-4 is in a grid shape. The limit block 2-4 can stop the slider 5 from sliding. The grid shape of the limit block 2-4 can also increase the arc extinguishing effect.

[0036] like Figure 8 As shown, the top surface of the main electrode 3-1 is lower than the upper opening of the through hole 2-3-1, which can prevent the solder from getting stuck when it is molten, that is, there is an accommodation space after the molten solder flows vertically, preventing the solder deposition from causing sliding obstruction to the slider 5.

[0037] The specific embodiments described in the above specification are only the specific implementation manners of the present utility model. Various examples do not constitute a limitation to the substantial content of the present utility model. Those of ordinary skill in the art can make modifications or variations to the previously described specific implementation manners after reading the specification, without departing from the essence and scope of the utility model.

Claims

1. A lightning protection module, comprising a housing (1), a frame (2), a varistor component (3) and a reed electrode (4), and further comprising a tripping mechanism including a slider (5) and a spring (6), wherein the frame (2) has a chip cavity (2-1) for accommodating the varistor component (3) and a tripping cavity (2-2) for accommodating the tripping mechanism, the chip cavity (2-1) and the tripping cavity (2-2) are separated by an inner plate (2-3) of the frame (2), and a through hole (2-3-1) is provided on the inner plate (2-3) to allow the main electrode (3-1) of the varistor component (3) in the chip cavity (2-1) to be welded to the reed electrode (4) in the tripping cavity. When the solder at the welded joint of the reed electrode (4) and the main electrode (3-1) melts, the slider (5) moves under the action of the spring (6) to disconnect and isolate the reed electrode (4) from the main electrode (3-1). It is characterized in that: Taking the direction in which the slider (5) moves when disconnecting the reed electrode (4) from the main electrode (3-1) as the front, the surface of the slider (5) facing the reed electrode (4) is the top surface of the slider (5), and the surface facing the inner plate (2-3) is the bottom surface of the slider (5). A number of arc extinguishing grooves (5-1) are provided on the end surface of the slider (5) entering and passing through the solder fusing area, and the arc extinguishing grooves (5-1) extend to the bottom surface of the slider (5).

2. The lightning protection module according to claim 1, characterized in that: The arc extinguishing groove (5-1) is a triangular groove.

3. The lightning protection module according to claim 1, characterized in that: The arc extinguishing groove (5-1) is a rectangular groove.

4. A lightning protection module according to claim 1, characterized in that: At least two bosses (2-3-2) are distributed on the plate wall of the chip cavity (2-1) on the inner plate (2-3) of the frame (2), and a variable volume space is formed between the varistor component (3) and the inner plate (2-3) by the bosses (2-3-2).

5. A lightning protection module according to claim 1, characterized in that: The chip cavity (2-1) is filled with an insulating glue for insulating and encapsulating the main body of the varistor component (3), and a concave glue channel (2-3-3) is provided on the plate wall of the inner plate (2-3) of the frame (2) where the chip cavity (2-1) is located.

6. The lightning protection module according to claim 5, characterized in that: The glue channel (2-3-3) includes at least two longitudinal glue channels arranged at intervals in the front-back direction and at least two transverse glue channels arranged at intervals in the left-right direction.

7. The lightning protection module according to claim 1, characterized in that: The top surface of the slider (5) has a working wedge surface (5-2) that is inclined forward and downward and is easy to lift the reed electrode (4) upward and is located below the reed electrode (4).

8. A lightning protection module according to claim 1, characterized in that: The spring (6) is a compression spring. The rear end of the spring (6) abuts against the frame (2), and the front end abuts against the slider (5). The slider (5) has a spring groove (5-3) with an opening facing the bottom surface, and at least a part of the spring (6) is located in the spring groove (5-3).

9. The lightning protection module according to claim 8, characterized in that: There are two springs (6), and the spring grooves (5-3) are two spaced left and right on the slider (5).

10. A lightning protection module according to claim 1, characterized in that: On the plate wall of the inner plate (2-3) where the release cavity (2-2) is located, a slide rail (2-3-4) for positioning and guiding the slider (5) is provided, and an anti-release protrusion and an anti-release groove that engage with each other are provided between the slide rail (2-3-4) and the slider (5).

11. A lightning protection module according to claim 1, characterized in that: in A limit block (2-4) is provided at a position in front of the slider (5) on the frame (2), and the limit block (2-4) is in a grid shape.

12. A lightning protection module according to claim 1, characterized in that: The top surface of the main electrode (3-1) is lower than the upper orifice of the through hole (2-3-1).

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