Fusing surge protector

Abstract

The utility model belongs to the technical field of circuit protection devices, and particularly provides a fusing surge protector which comprises a piezoresistor, a heat conduction shell, a tripping electrode, a first pin electrode and a fusing metal piece, the piezoresistor is in contact with the heat conduction shell, one end of the tripping electrode is welded to the piezoresistor through tripping solder, and the other end of the tripping electrode is welded to the fusing metal piece. The other end of the tripping electrode is connected with the first pin electrode through a fusing metal piece, the fusing metal piece makes contact with the heat conduction shell, and the melting point of the fusing metal piece is higher than that of the tripping welding flux. When the piezoresistor is heated to enable the temperature of the tripping solder to reach a melting point, the tripping solder is melted, the tripping electrode is separated from the piezoresistor, if an electric arc is generated between the tripping electrode and the piezoresistor at the moment, the temperature of the piezoresistor further rises, heat is transmitted to the fusing metal piece through the heat conduction shell, and the fusing metal piece is fused. When the temperature of the fusing metal piece reaches the melting point of the fusing metal piece, the fusing metal piece is fused, and the circuit is cut off, so that the electric arc between the tripping electrode and the piezoresistor can be eliminated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circuit protection devices, and particularly relates to a fusing surge protector. BACKGROUND

[0002] The surge protector is also called the electric surge protector, and its function is to limit the transient overvoltage flowing into the power line and the signal transmission line in the voltage range that can be borne by the device or system, or to drain the powerful lightning current into the ground, so as to protect the device or system from damage caused by the impact. The surge protector generally comprises a pin electrode and a pressure-sensitive resistor and the like. When the voltage of the pressure-sensitive resistor is too high to cause overvoltage conduction, the strong current will cause the pressure-sensitive resistor to heat strongly, and when the temperature of the pressure-sensitive resistor reaches a certain degree, the low-temperature solder melts, so that the tripping electrode is separated from the pressure-sensitive resistor, thereby cutting off the circuit and realizing the protection of the circuit. However, after the tripping electrode is separated from the pressure-sensitive resistor, since the distance between the tripping electrode and the pressure-sensitive resistor is small, a high-voltage arc may be generated between the tripping electrode and the pressure-sensitive resistor, so that the temperature of the pressure-sensitive resistor continues to rise, thereby easily causing a fire accident. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a fusing surge protector, and aims to solve the technical problem that the temperature of the pressure-sensitive resistor continues to rise due to the arc generated between the tripping electrode and the pressure-sensitive resistor after separation in the prior art surge protector, thereby easily causing a fire accident.

[0004] To achieve the above-mentioned purpose, the application adopts the technical scheme of a fusing surge protector, comprising a pressure-sensitive resistor, a heat-conducting shell, a tripping electrode, a first pin electrode and a fusing metal piece, the pressure-sensitive resistor is in contact with the heat-conducting shell, one end of the tripping electrode is welded with the pressure-sensitive resistor through tripping solder, the other end of the tripping electrode is connected and conducted with the first pin electrode through the fusing metal piece, the fusing metal piece is in contact with the heat-conducting shell, and the melting point of the fusing metal piece is higher than the melting point of the tripping solder.

[0005] Further, the fusing surge protector further comprises an electronic component assembly, the end of the tripping electrode away from the pressure-sensitive resistor is further connected and conducted with the first pin electrode through the electronic component assembly, the electronic component assembly is arranged in parallel with the fusing metal piece, and the electronic component assembly comprises a resistance and an inductance arranged in series.

[0006] Further, the heat-conducting shell is provided with a limiting groove, and the fusing metal piece is clamped in the limiting groove.

[0007] Further, the fuse surge protector further comprises a tripping mechanism connected to the tripping electrode, and the tripping mechanism is capable of driving the tripping electrode to move away from the varistor when the tripping solder melts.

[0008] Further, the tripping electrode is rotationally connected to the heat-conducting shell, and the tripping mechanism is capable of driving the tripping electrode to rotate relative to the heat-conducting shell to move away from the varistor when the tripping solder melts.

[0009] Further, the tripping mechanism comprises a movable element connected to the tripping electrode and an elastic element having two ends connected to the movable element and the heat-conducting shell respectively, and the elastic element is capable of driving the movable element to move, thereby driving the tripping electrode to move away from the varistor when the tripping solder melts.

[0010] Further, the fuse surge protector further comprises a first warning electrode and a second warning electrode, and the first warning electrode and the second warning electrode are arranged on the heat-conducting shell, the movable element abuts against the first warning electrode and makes the first warning electrode contact the second warning electrode, and the elastic element drives the movable element to move to release the first warning electrode, and the first warning electrode is separated from the second warning electrode when the tripping solder melts.

[0011] Further, the heat-conducting shell is provided with an encapsulation space, the varistor is arranged in the encapsulation space, and the tripping electrode and the tripping mechanism are arranged outside the encapsulation space, and the fuse surge protector further comprises an encapsulation body, the encapsulation body fills the encapsulation space and covers the varistor, and the varistor has a first extension electrode, the first extension electrode extends out of the encapsulation body and is welded to the tripping electrode through the tripping solder.

[0012] Further, the varistor has a first extension electrode provided with a connecting hole, and the tripping electrode has a plug-in part inserted into the connecting hole and welded to the hole wall of the connecting hole through the tripping solder, and the tripping mechanism is capable of driving the tripping electrode to move to make the plug-in part exit the connecting hole.

[0013] Further, the fuse surge protector further comprises an external shell, and the varistor, the heat-conducting shell, the tripping electrode and the fuse metal element are arranged in the external shell, and the first pin electrode partially extends out of the external shell.

[0014] Compared with the prior art, the beneficial effects of the fusible surge protector provided in this application are as follows: During operation, current flows through the first pin electrode, the fusible metal component, the tripping electrode, and the varistor. When the varistor heats up and the temperature of the tripping solder reaches the melting point of the tripping solder, the tripping solder melts, and the tripping electrode separates from the varistor. If an arc is generated between the tripping electrode and the varistor at this time, the temperature of the varistor will further increase. The heat generated by the varistor will be transferred to the fusible metal component through the heat-conducting shell. When the temperature of the fusible metal component reaches its melting point, the fusible metal component melts and cuts off the circuit. This helps to effectively eliminate the arc between the tripping electrode and the varistor and avoid fire accidents caused by the continued rise in the temperature of the varistor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of the fuse surge protector provided in the embodiments of this application;

[0017] Figure 2 for Figure 1 The diagram shows the structure of the surge protector after the outer casing is concealed. Figure 1 ;

[0018] Figure 3 for Figure 1 The diagram shows the structure of the surge protector after the outer casing is concealed. Figure 2 ;

[0019] Figure 4 for Figure 3 The diagram shows the structure of the heat-conducting housing of the fuse surge protector.

[0020] Figure 5 A circuit diagram of a fuse surge protector provided in an embodiment of this application.

[0021] The following are the labeling elements in the figure:

[0022] 10. Varistor; 11. First extended electrode; 12. Second extended electrode;

[0023] 20. Heat-conducting housing; 21. First groove; 211. Limiting groove; 212. Mounting groove; 213. Separating protrusion; 22. Guide rail; 23. Rotating shaft; 24. Positioning post; 25. Encapsulation space; 26. Second groove; 27. Third groove;

[0024] 30, tripping electrode; 31, plug-in portion;

[0025] 40, first pin electrode;

[0026] 50, fuse metal piece;

[0027] 60, tripping mechanism; 61, movable piece; 62, elastic piece;

[0028] 70, soft conductor;

[0029] 80, second pin electrode;

[0030] 90, first warning electrode;

[0031] 100, second warning electrode;

[0032] 110, electronic component assembly; 111, resistor; 112, inductor;

[0033] 120, external housing; 121, observation window. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like, should be construed broadly and, for example, can be a fixed connection, or a detachable connection, or integral; can be a mechanical connection, or an electrical connection; can be a direct connection, or an indirect connection via an intermediate medium, or an internal communication between two elements, or an interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In combination Figure 2 And Figure 3 As shown in the figure, the embodiment of the present application provides a fuse surge protector, which comprises a pressure sensitive resistor 10, a heat-conducting shell 20, a tripping electrode 30, a first pin electrode 40 and a fuse metal piece 50. The pressure sensitive resistor 10 is in contact with the heat-conducting shell 20. One end of the tripping electrode 30 is welded with the pressure sensitive resistor 10 through tripping solder. The other end of the tripping electrode 30 is connected with the first pin electrode 40 through the fuse metal piece 50. The fuse metal piece 50 is in contact with the heat-conducting shell 20. The melting point of the fuse metal piece 50 is higher than that of the tripping solder.

[0039] In work, current flows through the first pin electrode 40, the fuse metal piece 50, the tripping electrode 30 and the pressure sensitive resistor 10. When the pressure sensitive resistor 10 generates heat and the temperature of the tripping solder reaches the melting point of the tripping solder, the tripping solder melts, and the tripping electrode 30 separates from the pressure sensitive resistor 10. If an electric arc is generated between the tripping electrode 30 and the pressure sensitive resistor 10 at this time, the temperature of the pressure sensitive resistor 10 will further rise, and the heat generated by the pressure sensitive resistor 10 will be transmitted to the fuse metal piece 50 through the heat-conducting shell 20. When the temperature of the fuse metal piece 50 reaches its melting point, the fuse metal piece 50 melts, cutting off the circuit, thereby facilitating the elimination of the electric arc between the tripping electrode 30 and the pressure sensitive resistor 10, and avoiding fire accidents caused by continuous temperature rise of the pressure sensitive resistor 10. Compared with the traditional fuse surge protector, the fuse surge protector provided by the embodiment of the present application can effectively avoid the occurrence of fire accidents in the case of no electric arc generation and electric arc generation, and has higher reliability.

[0040] In order to make the heat generated by the pressure sensitive resistor 10 be transmitted to the fuse metal piece 50 efficiently, the heat-conducting shell 20 can be made of high-thermal-conductivity plastic material.

[0041] In one embodiment, in combination Figure 3 And Figure 4As shown, the heat-conducting shell 20 is provided with a limiting groove 211, and the fuse metal piece 50 is clamped in the limiting groove 211. By opening the limiting groove 211 in the heat-conducting shell 20 and clamping the fuse metal piece 50 in the limiting groove 211, the fuse metal piece 50 can be tightly attached to the heat-conducting shell 20, so as to ensure that the heat of the thermistor 111 can be efficiently transmitted to the fuse metal piece 50 through the heat-conducting shell 20, so that the fuse metal piece 50 can be timely fused, and the working reliability is improved. Specifically, the size of the limiting groove 211 is matched with the size of the fuse metal piece 50, and when the fuse metal piece 50 is placed in the limiting groove 211, the side wall of the limiting groove 211 can abut against the fuse metal piece 50, so as to realize clamping and fixing of the fuse metal piece 50.

[0042] In one embodiment, the fuse metal piece 50 is in a sheet shape. By setting the fuse metal piece 50 in a sheet shape, the contact area of the fuse metal piece 50 and the heat-conducting shell 20 can be increased, so that the heat generated by the thermistor 111 can be efficiently transmitted to the fuse metal piece 50 through the heat-conducting shell 20. Specifically, the fuse metal piece 50 can be selected as a tin sheet.

[0043] In one embodiment, as shown in the figure, Figure 3 The fuse surge protector further includes an electronic component assembly 110, and the tripping electrode 30 is connected to the first pin electrode 40 through the electronic component assembly 110 away from the pressure-sensitive resistor 10, the electronic component assembly 110 is arranged in parallel with the fuse metal piece 50, and the electronic component assembly 110 includes a resistor 111 and an inductor 112 arranged in series. By arranging the electronic component assembly 110 between the tripping electrode 30 and the first pin electrode 40, the electronic component assembly 110 is arranged in parallel with the fuse metal piece 50, that is, the current can flow to the fuse metal piece 50 and the electronic component assembly 110, the electronic component assembly 110 includes the resistor 111 and the inductor 112 arranged in series, and such arrangement can improve the stability of the circuit. Specifically, the fuse surge protector further includes a soft conductor 70, and the first pin electrode 40, the inductor 112, the resistor 111 and the tripping electrode 30 are connected through the soft conductor 70.

[0044] The circuit diagram of the fuse surge protector is as shown in the figure, Figure 5As shown, wherein, "R" is the resistance 111, "L" is the inductance 112, "T2" is the fuse metal piece 50, "T1" is the trip solder between the trip electrode 30 and the pressure sensitive resistor 10, and "MOV" is the pressure sensitive resistor 10. The discharge current path of the fuse surge protector is: from the L / N port, through the first pin electrode 40, to T2, then to T1, then to the MOV, and then to the N / PE port. When the temperature of T1 reaches its melting point, T1 is disconnected, and if an arc is generated at T1 at this time, the temperature of the MOV will further increase, and the heat generated by the MOV is transmitted to T2 through the heat-conducting shell 20. When the temperature of T2 reaches its melting point, T2 is fused, and the current is guided to R and L, which can limit the current and eliminate the arc generated at T1, while avoiding the generation of an arc at T2.

[0045] In one embodiment, in combination with Figure 3 and Figure 4 As shown, the heat-conducting shell 20 is also provided with a mounting groove 212, and the electronic component assembly 110 is arranged in the mounting groove 212. By providing the mounting groove 212 in the heat-conducting shell 20 and arranging the electronic component assembly 110 in the mounting groove 212, on the one hand, the mounting and fixation of the electronic component assembly 110 can be achieved, and on the other hand, the electronic component assembly 110 can be prevented from protruding from the outer surface of the heat-conducting shell 20, so as to facilitate subsequent installation.

[0046] In one embodiment, in combination with Figure 3 and Figure 4 As shown, the heat-conducting shell 20 is also provided with a first recess 21, and a partition protrusion 213 is arranged in the first recess 21. A limiting groove 211 for accommodating the fuse metal piece 50 is formed between one side of the partition protrusion 213 and one side wall of the first recess 21, and a mounting groove 212 for accommodating the electronic component assembly 110 is formed between the other side of the partition protrusion 213 and the other side wall of the first recess 21. One end of the first pin electrode 40 is located in the first recess 21 to be connected with the fuse metal piece 50 and the electronic component assembly 110, and the other end of the first pin electrode 40 extends out of the first recess 21 to be connected with external components.

[0047] In one embodiment, as shown in Figure 2 The fuse surge protector further comprises a trip mechanism 60 connected to the trip electrode 30. When the trip solder melts, the trip mechanism 60 can drive the trip electrode 30 to move away from the pressure sensitive resistor 10. When the trip solder melts, the trip mechanism 60 can drive the trip electrode 30 to move away from the pressure sensitive resistor 10, thereby increasing the distance between the trip electrode 30 and the pressure sensitive resistor 10, which is conducive to avoiding the generation of an arc.

[0048] In one embodiment, as shown in Figure 3As shown, the trip electrode 30 is connected to the end of the fuse metal piece 50 away from the first pin electrode 40 by a soft conductor 70. By arranging the soft conductor 70 to connect the trip electrode 30 and the fuse metal piece 50, when the trip electrode 30 is driven to move by the trip mechanism 60, the soft conductor 70 can adaptively bend and deform, reducing the impact on the fuse metal piece 50, so that the fuse metal piece 50 can maintain close contact with the heat-conducting shell 20, ensuring that the heat generated by the pressure-sensitive resistor 10 is efficiently transmitted to the fuse metal piece 50 through the heat-conducting shell 20. Specifically, the soft conductor 70 can be made of a conductive metal material, and the trip electrode 30 and the fuse metal piece 50 are respectively welded and fixed to opposite ends of the soft conductor 70. The fuse metal piece 50 and the first pin electrode 40 can be connected by another soft conductor 70.

[0049] In one embodiment, as shown in Figure 2 The trip mechanism 60 includes a moving part 61 connected to the trip electrode 30 and an elastic part 62 connected to the moving part 61 and the heat-conducting shell 20 at both ends. When the trip solder melts, the elastic part 62 can drive the moving part 61 to move, thereby driving the trip electrode 30 to move away from the pressure-sensitive resistor 10. By using the elastic force of the elastic part 62 to drive the moving part 61 to move, thereby driving the trip electrode 30 to move away from the pressure-sensitive resistor 10, it has the advantages of simple structure, easy manufacturing, and reliable work. Specifically, the elastic part 62 can be a compression spring or a tension spring. When the elastic part 62 is a compression spring, before the trip solder melts, the compression spring is in a compressed state, and when the trip solder melts, the compression spring can elongate to restore its original state, thereby pushing the moving part to move, and the moving part drives the trip electrode 30 to move away from the pressure-sensitive resistor 10. When the elastic part 62 is a tension spring, before the trip solder melts, the tension spring is in a stretched state, and when the trip solder melts, the tension spring can shorten to restore its original state, thereby pulling the moving part to move, and the moving part drives the trip electrode 30 to move away from the pressure-sensitive resistor 10.

[0050] In one embodiment, as shown in Figure 2 The heat-conducting shell 20 is provided with a guide rail 22, and the moving part 61 is slidably connected to the guide rail 22. By arranging the guide rail 22 on the heat-conducting shell 20 and slidably connecting the moving part 61 to the guide rail 22, the moving part 61 can be guided to move in a predetermined direction stably under the drive of the elastic part 62 to drive the trip electrode 30 to move away from the pressure-sensitive resistor 10, improving the work reliability.

[0051] In one embodiment, the trip electrode 30 is rotatably connected to the heat-conducting shell 20, and when the trip solder melts, the trip mechanism 60 can drive the trip electrode 30 to rotate relative to the heat-conducting shell 20 to move away from the pressure-sensitive resistor 10. Specifically, in combination withFigure 2 and Figure 4 As shown, a rotating shaft 23 is provided on the heat-conducting housing 20, and a sleeve hole is provided on the tripping electrode 30. The tripping electrode 30 is rotatably sleeved on the rotating shaft 23 through the sleeve hole.

[0052] In one embodiment, such as Figure 2 As shown, the varistor 10 has a first protruding electrode 11 with a connection hole. The tripping electrode 30 has a plug-in portion 31, which is inserted into the connection hole and soldered to the hole wall using tripping solder. The tripping mechanism 60 can drive the tripping electrode 30 to move so that the plug-in portion 31 exits the connection hole. By providing a connection hole in the first protruding electrode 11 of the varistor 10 and a plug-in portion 31 in the tripping electrode 30, the plug-in portion 31 can be easily inserted into the connection hole, facilitating the soldering of the plug-in portion 31 to the hole wall using tripping solder. When the tripping solder melts, the tripping mechanism 60 can drive the tripping electrode 30 to move so that the plug-in portion 31 exits the connection hole, thereby separating the tripping electrode 30 from the varistor 10. Specifically, when the tripping solder melts, the movable member 61 moves under the drive of the elastic member 62, causing the tripping electrode 30 to rotate around the rotating shaft 23, thereby causing the plug-in portion 31 to exit the connection hole.

[0053] In one embodiment, such as Figure 3 As shown, the varistor 10 also has a second extended electrode 12, and the surge protector also includes a second pin electrode 80, with the second extended electrode 12 connected to the second pin electrode 80. Both the first pin electrode 40 and the second pin electrode 80 are used for electrical connection to external components.

[0054] In one embodiment, such as Figure 3 As shown, the surge protector also includes a first alarm electrode 90 and a second alarm electrode 100. Both the first alarm electrode 90 and the second alarm electrode 100 are disposed on the heat-conducting housing 20. The movable member 61 abuts against the first alarm electrode 90 and makes the first alarm electrode 90 contact the second alarm electrode 100. When the trip solder melts, the elastic member 62 drives the movable member 61 to move to release the first alarm electrode 90, and the first alarm electrode 90 separates from the second alarm electrode 100. The first alarm electrode 90 and the second alarm electrode 100 form a switch structure to control the alarm device. When the tripping solder has not melted, the movable member 61 abuts against the first alarm electrode 90, causing the first alarm electrode 90 to undergo slight deformation. The first alarm electrode 90 and the second alarm electrode 100 then make contact and conduct. When the tripping solder melts, the elastic member 62 drives the movable member 61 to move and release the first alarm electrode 90. The first alarm electrode 90 returns to its original state and separates from the second alarm electrode 100, thereby triggering the alarm device and sending an alarm signal to the outside world.

[0055] It can be understood that if the melting point of the fuse metal piece 50 is lower than the melting point of the tripping solder, since the circuit is disconnected after the fuse metal piece 50 is fused, the temperature of the pressure-sensitive resistor 10 no longer rises, thus the temperature of the tripping solder cannot reach its melting point, and the first alarm electrode 90 and the second alarm electrode 100 cannot be separated to trigger the alarm device. Even if the melting point of the fuse metal piece 50 is the same as the melting point of the tripping solder, affected by the heat conduction and heat dissipation rate, it is difficult to ensure that the temperature of the tripping solder reaches its melting point before the fuse metal piece 50 is fused. In the embodiment of the present application, by making the melting point of the fuse metal piece 50 higher than the melting point of the tripping solder, it can be ensured that the tripping solder melts before the fuse metal piece 50 is fused, so as to stably trigger the alarm device.

[0056] Specifically, the first alarm electrode 90 and the second alarm electrode 100 are both in the shape of a rod, one end of the first alarm electrode 90 and one end of the second alarm electrode 100 are used for contact and separation, and the other end of the first alarm electrode 90 and the other end of the second alarm electrode 100 are used for connecting the circuit board, as shown in Figure 4 As shown, the heat-conducting shell 20 is provided with a plurality of positioning columns 24, and the first alarm electrode 90 and the second alarm electrode 100 are wound on the positioning columns 24 for fixation.

[0057] In one embodiment, in combination with Figure 3 and Figure 4 As shown, the heat-conducting shell 20 provided with the first recess 21 on one side is further provided with a second recess 26 and a third recess 27, the first alarm electrode 90, the second alarm electrode 100 and the positioning column 24 are all arranged in the second recess 26, and the movable piece 61 partially extends into the second recess 26, so that one end of the first alarm electrode 90 and one end of the second alarm electrode 100 are in contact, one end of the first alarm electrode 90 away from the movable piece 61 and one end of the second alarm electrode 100 away from the movable piece 61 both extend out of the second recess 26, for connecting with the external circuit board, the second extending electrode 12 of the pressure-sensitive resistor 10 extends into the third recess 27 through the heat-conducting shell 20, one end of the second pin electrode 80 is located in the third recess 27, for connecting with the second extending electrode 12, and the other end of the second pin electrode 80 extends out of the third recess 27, for connecting with the external component.

[0058] In one embodiment, as shown in Figure 2As shown, the heat-conducting shell 20 is provided with an encapsulation space 25, the pressure-sensitive resistor 10 is arranged in the encapsulation space 25, and the tripping electrode 30 and the tripping mechanism 60 are arranged outside the encapsulation space 25; the fuse surge protector further comprises an encapsulation body (not shown), the encapsulation body fills the encapsulation space 25 and covers the pressure-sensitive resistor 10, and the first extension electrode 11 of the pressure-sensitive resistor 10 extends out of the encapsulation body and is welded with the tripping electrode 30 through tripping solder. By providing the encapsulation space 25 in the heat-conducting shell 20, the pressure-sensitive resistor 10 is arranged in the encapsulation space 25, and then the encapsulation body is arranged in the encapsulation space 25, so that the encapsulation body fills the encapsulation space 25 and covers the pressure-sensitive resistor 10, thereby realizing the encapsulation and fixation of the pressure-sensitive resistor 10. Since the tripping electrode 30 needs to move away from the pressure-sensitive resistor 10 under the driving of the tripping mechanism 60, the tripping electrode 30 and the tripping mechanism 60 are arranged outside the encapsulation space 25, and at the same time, the first extension electrode 11 of the pressure-sensitive resistor 10 extends out of the encapsulation body, so as to satisfy the welding of the first extension electrode 11 and the tripping electrode 30 through tripping solder. In addition, the second extension electrode 12 of the pressure-sensitive resistor 10 also extends out of the encapsulation body, so as to satisfy the connection of the second extension electrode 12 and the second pin electrode 80. Specifically, the encapsulation body can be selected from silica gel. Specifically, the encapsulation space 25 is a groove structure, and the first groove 21 is arranged on the opposite side of the heat-conducting shell 20, respectively.

[0059] In one embodiment, as shown in Figure 1 The fuse surge protector further comprises an external shell 120, the pressure-sensitive resistor 10, the heat-conducting shell 20, the tripping electrode 30, the fuse metal piece 50 and the tripping mechanism 60 are all arranged in the external shell 120, and the partial first pin electrode 40 and the partial second pin electrode 80 extend out of the external shell 120, for connecting with external components. Specifically, the bottom of the external shell 120 is provided with an opening, the heat-conducting shell 20 can be loaded into the external shell 120 through the opening, and the heat-conducting shell 20 and the external shell 120 can be connected through a buckle structure.

[0060] In one embodiment, as shown in Figure 1As shown, the top of the outer shell 120 is provided with an observation window 121 which is aligned with the position of the movable member 61, and the color of the movable member 61 is different from that of the heat-conducting shell 20. When the fuse melts, the movable member 61 can move away from the observation window 121 under the drive of the elastic member 62, so that the observation window 121 is aligned with the heat-conducting shell 20. Specifically, the color of the movable member 61 can be green, and the color of the heat-conducting shell 20 can be red. When the fuse surge protector is in a normal working state, the color observed by the worker through the observation window 121 is green. When the fuse melts, the elastic member 62 drives the movable member 61 to move, so that the movable member 61 moves away from the observation window 121. At this time, the color observed by the worker through the observation window 121 is red, so as to remind the worker that the fuse surge protector is faulty and should be replaced in time.

[0061] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fuse surge protector, characterized by, The fuse surge protector comprises a pressure sensitive resistor, a heat conductive shell, a tripping electrode, a first pin electrode and a fuse metal piece, the pressure sensitive resistor is in contact with the heat conductive shell, one end of the tripping electrode is welded with the pressure sensitive resistor through a tripping solder, the other end of the tripping electrode is connected with the first pin electrode through the fuse metal piece, the fuse metal piece is in contact with the heat conductive shell, and the melting point of the fuse metal piece is higher than the melting point of the tripping solder.

2. The fuse surge protector of claim 1, wherein: The fuse surge protector further comprises an electronic component assembly, the tripping electrode is connected with the first pin electrode through the electronic component assembly at the end away from the pressure sensitive resistor, the electronic component assembly is arranged in parallel with the fuse metal piece, and the electronic component assembly comprises a resistance and an inductance arranged in series.

3. The fuse surge protector of claim 1, wherein: The heat conductive shell is provided with a limiting groove, and the fuse metal piece is clamped in the limiting groove.

4. The fuse surge protector of any one of claims 1-3, wherein: The fuse surge protector further comprises a tripping mechanism connected to the tripping electrode, and the tripping mechanism can drive the tripping electrode to move away from the pressure sensitive resistor when the tripping solder melts.

5. The fuse surge protector of claim 4, wherein: The tripping electrode is rotationally connected with the heat conductive shell, and the tripping mechanism can drive the tripping electrode to rotate relative to the heat conductive shell to move away from the pressure sensitive resistor when the tripping solder melts.

6. The fuse surge protector of claim 4, wherein: The tripping mechanism comprises a movable piece connected with the tripping electrode and an elastic piece having two ends connected with the movable piece and the heat conductive shell respectively, and the elastic piece can drive the movable piece to move when the tripping solder melts, thereby driving the tripping electrode to move away from the pressure sensitive resistor.

7. The fuse surge protector of claim 6, wherein: The fuse surge protector further comprises a first warning electrode and a second warning electrode, both of which are arranged on the heat conductive shell, the movable piece abuts against the first warning electrode and makes the first warning electrode contact the second warning electrode, and the elastic piece drives the movable piece to move to release the first warning electrode when the tripping solder melts, so that the first warning electrode is separated from the second warning electrode.

8. The fuse surge protector of claim 4, wherein: The heat conductive shell is provided with an encapsulation space, the pressure sensitive resistor is arranged in the encapsulation space, and the tripping electrode and the tripping mechanism are arranged outside the encapsulation space; the fuse surge protector further comprises an encapsulation body, the encapsulation body fills the encapsulation space and encapsulates the pressure sensitive resistor, the pressure sensitive resistor has a first protruding electrode, and the first protruding electrode protrudes out of the encapsulation body and is welded with the tripping electrode through the tripping solder.

9. The fuse surge protector of claim 4, wherein: The pressure sensitive resistor has a first protruding electrode provided with a connecting hole, the tripping electrode has a plug-in part inserted into the connecting hole and welded with the hole wall of the connecting hole through the tripping solder, and the tripping mechanism can drive the tripping electrode to move so that the plug-in part exits the connecting hole.

10. The surge protection device according to any one of claims 1 to 3, wherein: The fuse surge protector further includes an outer housing, the varistor, the thermally conductive housing, the trip electrode, and the fuse metal piece are all disposed within the outer housing, and the first pin electrode partially extends out of the outer housing.

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