Surge protection device

Abstract

The utility model relates to the technical field of electrical protection devices, in particular to a surge protection device, which comprises a pressure-sensitive assembly, a sliding block, an elastic piece and a reed electrode, the sliding block is arranged between the reed electrode and the pressure-sensitive assembly, and the reed electrode is welded with an electrode of the pressure-sensitive assembly through the temperature sensing body; the elastic piece abuts against the sliding block, the elastic piece is in a force storage state, and the sliding block abuts against the joint of the reed electrode and the pressure-sensitive assembly; wherein a heat drawing electrode is arranged at an electrode of the pressure-sensitive assembly, the heat drawing electrode is connected with the temperature sensing body, and a heat conduction piece is arranged in an inner cavity of the heat drawing electrode. By means of the arrangement, the surge protection device can meet the requirements of heat drawing and tripping to cut off a circuit under the system voltage of 1000 V and above, and the phenomenon of igniting equipment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical protection devices, in particular to a surge protector. Background Art

[0002] A surge protection device (SPD), also known as a lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. When a sudden spike in current or voltage is generated in an electrical circuit or communication line due to external interference, the surge protector can conduct and shunt the current in a very short time, thereby preventing the surge from damaging other equipment in the circuit. An SPD is an indispensable device for lightning protection of electronic equipment. Its function is to limit the instantaneous overvoltage that penetrates power lines and signal transmission lines to a voltage range that the equipment or system can withstand, or to discharge the powerful lightning current into the ground, protecting the protected equipment or system from impact.

[0003] Currently, second-generation 1500V products are gradually replacing first-generation 2000V products in the photovoltaic inverter and combiner box market. The maturation of the supporting industry chain for 1500V products, particularly in the past two years, has accelerated their market penetration. However, due to limitations in the heat dissipation speed of varistor failure in these 1500V products, there is still a risk of failure to disconnect the circuit in a timely manner, leading to ignition of the housing or equipment. Furthermore, with increasing demands for improved efficiency and reduced costs in photovoltaic systems, the market is also focusing on higher-voltage inverters, such as 2000V. PV SPDs for system voltages of 2000V and above will also have higher requirements for heat dissipation and tripping circuits. Therefore, developing a PV SPD that can meet system voltages of 2000V and above has become a pressing technical challenge for those skilled in the art.

[0004] It should be noted that the information disclosed in this background technology section is only intended to increase understanding of the overall background of the present invention, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Utility Model Content

[0005] The utility model provides a surge protector, which includes a pressure-sensitive component, a slider, an elastic member and a reed electrode; the slider is arranged between the reed electrode and the pressure-sensitive component, and the reed electrode is welded to the electrode of the pressure-sensitive component through a temperature sensor; the elastic member abuts the slider, the elastic member is in a force storage state, and the slider abuts the connection between the reed electrode and the pressure-sensitive component; wherein, a heat-absorbing electrode is arranged at the electrode of the pressure-sensitive component, the heat-absorbing electrode is connected to the temperature sensor, and a heat-conducting member is arranged in the internal cavity of the heat-absorbing electrode.

[0006] Furthermore, the heat conducting member adopts a metal structure or a structure composed of a heat conducting filling material.

[0007] Furthermore, the heat conducting member and the heat absorbing electrode are integrally formed to form a solid structure.

[0008] Furthermore, the surge protector also includes a shell and a frame. The frame is arranged in the shell. The pressure-sensitive component, slider and elastic member are arranged in the frame. The slot on the frame limits the slider. The ribs on the frame abut against the shell to prevent the shell from squeezing the slider.

[0009] Furthermore, the slider does not contact the housing.

[0010] Furthermore, the reed electrode also includes a reed end and a flexible connector, one end of the reed end is welded to the electrode of the pressure-sensitive component, and the other end is connected to one end of the flexible connector, the other end of the flexible connector is fixed to the frame, and a tension spring is provided on the reed end, and the tension spring is connected to the frame.

[0011] Furthermore, the surge protector further includes a discharge tube, which is connected in series with the voltage-sensitive component.

[0012] Furthermore, the surge protector further includes a discharge tube, which is arranged on a side of the reed electrode.

[0013] Furthermore, the reed electrode has a rebound characteristic, and the reed electrode is an integrated structure or a split structure.

[0014] Furthermore, the surge protector also includes a first remote signal pin and a second remote signal pin. In a normal state, the first remote signal pin and the second remote signal pin are in a normally closed state under the squeezing of the slider; in a failure state, the slider slides and releases under the action of the elastic member, and the first remote signal pin and the second remote signal pin rebound and are in a disconnected state.

[0015] The utility model provides a surge protector, which is equipped with a pressure-sensitive component, a slider, an elastic member, a reed electrode, a temperature sensor and a heat-absorbing electrode. The temperature sensor is quickly melted by the rapid heat absorption of the heat-absorbing electrode, and the slider quickly cuts off the circuit under the action of the elastic member. Therefore, the surge protector can meet the requirements of heat absorption and circuit disconnection at system voltages of 1000V and above, avoiding the phenomenon of igniting equipment.

[0016] Other features and beneficial effects of the present invention will be described in the following description, and some of the technical features and beneficial effects can be obviously derived from the description or understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, some of the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of an explosion of a surge protector provided by the first embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the surge protector provided by the first embodiment in a normal state;

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure;

[0021] Figure 4 1 is a schematic structural diagram of the surge protector provided by the first embodiment in a failed state;

[0022] Figure 5 yes Figure 4 Schematic diagram of the cross-section structure;

[0023] Figure 6 It is a structural schematic diagram of an existing electrode having a hollow structure;

[0024] Figure 7 This is a schematic diagram of the structure of the heat-absorbing electrode with a built-in heat conductor;

[0025] Figure 8 It is a structural schematic diagram of a heat-absorbing electrode having a solid structure;

[0026] Figure 9 This is a structural diagram of a split-type reed electrode provided by an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of an explosion of a surge protector provided by the second embodiment of the present utility model;

[0028] Figure 11 This is a circuit diagram of a surge protector provided by a second embodiment of the present utility model;

[0029] Figure 12 This is a circuit diagram of a surge protector provided by a third embodiment of the present utility model;

[0030] Figure 13 1 is a schematic structural diagram of a surge protector provided by a fourth embodiment of the present invention in a normal state;

[0031] Figure 141 is a schematic structural diagram of a surge protector provided in a fourth embodiment of the present invention in a failed state;

[0032] Reference numerals:

[0033] 1-shell; 2-pressure-sensitive component; 201-electrode; 202-piezoresistor; 5-frame; 501-card slot; 502-convex rib; 6-first remote signal pin; 7-second remote signal pin; 8-slider; 9-temperature sensor; 10-reed electrode; 101-reed end; 102-connector; 103-lead-out pin; 104-flexible connector; 11-elastic member; 13-discharge tube; 15-tension spring; 20-heat-absorbing electrode; 30-thermal conductor. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof all mean "at least including".

[0036] See also Figures 1 to 5 , Figure 1 This is a schematic diagram of an explosion of a surge protector provided by the first embodiment of the utility model. Figure 2 FIG1 is a schematic structural diagram of the surge protector provided by the first embodiment in a normal state. Figure 3 yes Figure 2Schematic diagram of the cross-section structure, Figure 4 is a schematic structural diagram of the surge protector provided by the first embodiment in a failed state, Figure 5 yes Figure 4 Schematic diagram of a cross-sectional structure. To achieve at least one of the aforementioned advantages or other advantages, the first embodiment of the present invention provides a surge protector. The surge protector includes a pressure-sensitive component 2, a slider 8, a spring member 11, and a reed electrode 10. The pressure-sensitive component 2 includes a connected varistor 202 and an electrode 201.

[0037] The slider 8 is arranged between the reed electrode 10 and the pressure-sensitive component 2. The reed electrode 10 is connected to the electrode 201 of the pressure-sensitive component 2 through the temperature-sensitive body 9. In this embodiment, the reed electrode 10 is an integrated structure. One end of the elastic member 11 abuts against the guide column on the slider 8, and the other end is set in the limit groove of the frame 5, which is in a force storage state, thereby driving the slider 8 to abut against the connection between the reed electrode 10 and the pressure-sensitive component 2. When tripped, the elastic member 11 recovers and provides power for the movement of the slider 8; the reed electrode 10 has a rebound characteristic, and when tripped, the reed electrode 10 bounces upward, and the elastic member 11 can be a spring. A heat-absorbing electrode is provided at the electrode 201 of the pressure-sensitive component 2, and the heat-absorbing electrode is connected to the temperature-sensitive body 9.

[0038] Furthermore, the surge protector includes a first remote signal pin 6 and a second remote signal pin 7, and a contact plate is provided at the lower end of a slider 8. In a normal state, the first remote signal pin 6 and the second remote signal pin 7 are squeezed by the contact plate of the slider 8 and are in a normally closed state. In a failure state, the slider 8 slides rapidly and releases due to the rebound of the elastic member 11 and the reed electrode 10, and the first remote signal pin 6 and the second remote signal pin 7 rebound and are in an open state.

[0039] When the varistor 202 experiences an overvoltage, the temperature sensing element 9 between the heat-absorbing electrode 20 and the reed electrode 10 on the varistor 202 melts due to the heat. The slider 8, under the action of the elastic member 11, slides between the reed electrode 10 and the heat-absorbing electrode 20. The reed electrode 10 springs upward, disconnecting the heat-absorbing electrode 20 from the reed electrode 10. The slider 8 blocks the reed electrode 10 and the heat-absorbing electrode 20, disconnecting the overheated varistor 202 from the circuit. Simultaneously, the first and second remote signal pins 6 and 7 rebound, transmitting an alarm signal, thereby protecting the electrical equipment.

[0040] Furthermore, the surge protector includes a housing 1 and a frame 5. The frame 5 is disposed within the housing 1, and the pressure-sensitive component 2, the slider 8, and the elastic member 11 are disposed within the frame 5. The slot 501 on the frame 5 limits the slider 8, and the rib 502 on the frame 5 abuts the housing 1 to prevent the housing 1 from squeezing the slider 8. The slider 8 quickly cuts off the circuit under the action of the elastic member 11. The cutting speed is provided not only by the heat from the heat-absorbing electrode 20, which causes the temperature sensor 9 to melt and the reed electrode 10 to spring up and cut off the circuit, but also mainly by the initial sliding acceleration provided by the force of the elastic member 11 and the reduction of the sliding friction of the slider 8.

[0041] The sliding friction can be reduced by using a polishing process and point-line and / or line-surface contact between the slider 8 and the frame 5 to avoid surface-surface contact, thereby reducing the sliding friction.

[0042] The method of reducing the sliding friction force may include limiting the slider 8 through the slot 501 of the frame 5 and the rib 502 of the frame 5 against the shell, so as to prevent the slider 8 from tilting and / or the shell 1 from shrinking and being squeezed and contacted by the slider 8, thereby effectively avoiding the sliding process of the slider 8 and the friction between the slider 8 and the shell 1. Optionally, the slider 8 is inserted into the slot 501 of the frame 5 to ensure that the squeezing area of ​​the slider 8 can steadily squeeze the first remote signal pin 6 and the second remote signal pin 7 during the process, turnover, and long-term harsh environment, further providing a basic guarantee for preventing intermittent false alarms in the remote signal.

[0043] The sliding friction force may be reduced by maintaining a sufficient distance between the slider 8 and the housing 1 to ensure that the slider 8 and the housing 1 do not contact each other, that is, the slider 8 does not contact the housing 1 .

[0044] In some embodiments, a wrapping layer made of a high-temperature resistant material can be provided on the slider 8 to prevent the slider 8 from melting or catching fire due to heat when high current passes through it, effectively protecting the safety of equipment and personnel. The wrapping layer can be a U-shaped shell that fits over the slider 8. The U-shaped shell structure can be directly attached to the slider 8 to provide high-temperature resistance. Of course, the slider 8 can also be a single slider 8 with high-temperature resistant materials, or a slider 8 of a common material coated with a fire-retardant slurry, and the present invention is not limited to the description in this embodiment.

[0045] like Figure 6 As shown in the figure, the existing electrodes will adopt a hollow structure design. In other words, the electrode is hollow, a hollow structure with closed sides and a hollow center, which absorbs heat from the surrounding. Figure 7 In the embodiment shown, a heat conducting member 30 is disposed in the inner cavity of the heat-absorbing electrode 20. Optionally, the heat conducting member 30 is a metal structure (such as copper, aluminum, etc.) or a structure composed of a heat-conducting filling material. Figure 7 Compared to Figure 6In terms of the hollow structure, the heat-absorbing electrode 20 of this embodiment can not only quickly absorb heat from the surrounding area, but also further absorb heat through the built-in heat conductor 30, so that the temperature sensing body 9 melts more quickly.

[0046] In some embodiments, as Figure 8 As shown, the heat-absorbing electrode 20 is a solid structure, that is, the heat-conducting member 30 and the heat-absorbing electrode 20 are integrally formed to form a solid structure. Figure 7 As for the heat-absorbing electrode 20 of this embodiment, the heat-absorbing electrode 20 can not only absorb heat quickly from the surrounding area, but also directly absorb heat from the bottom of the heat-absorbing electrode 20, which is a more direct and rapid heat-absorbing method under the same conditions. In general, under the same conditions, Figure 8 The heat absorption speed of the heat absorption electrode 20 is faster than Figure 7 The heat absorption rate of the heat absorption electrode 20, Figure 7 The heat absorption speed of the heat absorption electrode 20 is faster than Figure 6 The heat absorption rate of the heat absorption electrode 20.

[0047] In some embodiments, as Figure 9 As shown, compared with Figure 1 Compared to the surge protector of this embodiment, the main difference lies in: the reed electrode 10 is a split structure, that is, the reed electrode 10 is composed of a reed terminal 101, a connector 102, and a lead pin 103. The two ends of the connector 102 are respectively connected to the reed terminal 101 and the lead pin 103. In some embodiments, the reed electrode 10 can also be composed of a reed terminal 101 and a lead pin 103 connected together. The connector 102 can be a flexible connector.

[0048] In some embodiments, as Figure 10 and Figure 11 As shown, compared with Figure 1 Compared to the surge protector of this embodiment, the main difference lies in: the surge protector also includes a discharge tube 13, which is connected in series with the varistor 2. The series connection of the discharge tube 13 eliminates leakage current under normal operating conditions, effectively extending the service life of the varistor 202. At the same time, the switching characteristics of the discharge tube 13 enable the selection of a varistor 202 with a lower voltage specification under the same system voltage, reducing the residual voltage of the lightning protection module and preventing damage to low-voltage components such as diodes, transistors, and capacitors in the subsequent protection circuit.

[0049] In some embodiments, as Figure 12 As shown, compared with Figure 11Compared to the surge protector shown in FIG. , the main difference of this embodiment lies in: the discharge tube 13 is placed on the side of the reed electrode 10. The discharge tube 13 and the varistor 2 are still connected in series; only the placement has changed. This arrangement is more suitable for applications where the width of the board-mounted product is relatively small. Furthermore, the impact of welding stress on the discharge tube 13 can be reduced during the production process. Furthermore, in terms of heat absorption, the series arrangement of "discharge tube 13 - varistor 202 - thermal trip device" has been changed to a series arrangement of "discharge tube - thermal trip device - varistor 202". In comparison, the thermal trip device of this embodiment is placed between the discharge tube 13 and the varistor 202. In addition to absorbing heat from the heat-absorbing electrode 20, it can also absorb heat from the side of the discharge tube 13, resulting in a better heat absorption effect.

[0050] In some embodiments, as Figure 13 and Figure 14 As shown, compared with Figure 1 As for the surge protector shown, the main difference of this embodiment is that: the surge protector has a dual tripping function, and the reed electrode 10 is a split structure. In addition to the slider 8 sliding and tripping under the action of the elastic member 11, a tension spring 15 is also provided. The reed electrode 10 can also include a reed end 101 and a flexible connector 104. One end of the reed end 101 is welded to the electrode 201 of the pressure-sensitive component 2, and the other end is connected to one end of the flexible connector 104. The other end of the flexible connector 104 is fixed to the frame 5. The reed end 101 is provided with a tension spring 15, and the tension spring 15 is connected to the frame 5. The flexible connector 104 in this embodiment is a flexible braided soft wire and has a conductive function. It can bend and deform when tripping, providing space for the reed end 101 to move in the opposite direction. Of course, in other embodiments, the flexible connector 104 can also be other flexible conductive structures. The reed end 101 is connected to the tension spring 15, which forces it away from the heat-absorbing electrode 20. After the temperature sensor 9 melts, the spring 11 pushes the slider 8 to slide (toward the left in the figure). The tension spring 15 then forces the reed end 101 to move in the opposite direction (toward the right), away from the heat-absorbing electrode 20. Both circuit breakers independently trip, creating a dual-trip mode that reduces the probability of tripping anomalies and further prolongs and interrupts the arc.

[0051] To sum up, the surge protector provided by the present invention is equipped with a pressure-sensitive component 2, a slider 8, an elastic member 11, a reed electrode 10, a temperature sensor 9 and a heat-absorbing electrode 20. The temperature sensor 9 is quickly melted by the rapid heat absorption of the heat-absorbing electrode 20, and the slider 8 quickly cuts off the circuit under the action of the elastic member, so that the surge protector can meet the requirements of heat absorption and tripping to cut off the circuit under system voltages of 1000V and above (such as 2000V, 2500V, etc.), avoiding the phenomenon of igniting equipment.

[0052] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention may be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background art at the same time. Those skilled in the art should understand that the absence of any content in a claim should not be construed as a limitation on that claim.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surge protector, characterized in that: The surge protector comprises: A pressure-sensitive component, a slider, an elastic member, and a reed electrode; the slider is disposed between the reed electrode and the pressure-sensitive component, and the reed electrode is welded to the electrode of the pressure-sensitive component via a temperature sensor; the elastic member abuts against the slider, the elastic member is in a force storage state, and the slider abuts against the connection between the reed electrode and the pressure-sensitive component; Wherein, a heat-absorbing electrode is provided at the electrode of the pressure-sensitive component, the heat-absorbing electrode is connected to the temperature sensing body, and a heat-conducting member is provided in the internal cavity of the heat-absorbing electrode.

2. The surge protector according to claim 1, wherein: The heat conducting member adopts a metal structure or a structure made of a heat conducting filling material.

3. The surge protector according to claim 1, wherein: The heat conducting member and the heat absorbing electrode are integrally formed to form a solid structure.

4. The surge protector according to claim 1, wherein: The surge protector also includes a shell and a frame. The frame is arranged in the shell. The pressure-sensitive component, the slider and the elastic member are arranged in the frame. The slot on the frame limits the slider. The rib on the frame abuts against the shell to prevent the shell from squeezing the slider.

5. The surge protector according to claim 4, characterized in that: The slider does not contact the housing.

6. The surge protector according to claim 4, characterized in that: The reed electrode also includes a reed end and a flexible connector. One end of the reed end is welded to the electrode of the pressure-sensitive component, and the other end is connected to one end of the flexible connector. The other end of the flexible connector is fixed to the frame. A tension spring is provided on the reed end, and the tension spring is connected to the frame.

7. The surge protector according to claim 1, wherein: The surge protector further includes a discharge tube, which is connected in series with the pressure-sensitive component.

8. The surge protector according to claim 1, wherein: The surge protector further includes a discharge tube, which is arranged on a side of the reed electrode.

9. The surge protector according to claim 1, wherein: The reed electrode has a rebound characteristic and is an integrated structure or a split structure.

10. The surge protector according to claim 1, wherein: The surge protector also includes a first remote signal pin and a second remote signal pin. In a normal state, the first remote signal pin and the second remote signal pin are in a normally closed state under the squeezing of the slider; in a failure state, the slider slides and releases under the action of the elastic member, and the first remote signal pin and the second remote signal pin rebound and are in a disconnected state.

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