Surge protector for protecting low-voltage overhead transmission line

Abstract

The utility model relates to electric appliance safety protection equipment, in particular to a surge protector for protecting a low-voltage overhead transmission line, which is characterized in that the surge protector comprises a main body, a flip cover, a tripping torsion spring and a low-temperature electrode, one side of the flip cover is hinged to one side of the bottom of the main body through the tripping torsion spring, and the other side of the flip cover is hinged to the low-temperature electrode. And the low-temperature electrode is welded between the main body and the turning cover. Compared with a traditional surge protector, after the low-temperature electrode is melted, the flip cover rotates towards the direction deviating from the main body, so that the appearance state of the surge protector is changed for warning, and when the low-temperature electrode is not fused, the whole surge protector can be kept closed, and the outdoor waterproof and snow-proof requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of equipment protection technology, and more specifically, it relates to a surge protector for the protection of low-voltage overhead transmission lines. Background Technology

[0002] Traditional surge protectors are commonly used for surge protection of overhead transmission lines. Their design often incorporates some redundancy, with the bottom typically exposed, and internally containing varistor elements such as zinc oxide or silicon carbide. Their two conductors connect to the transmission line and the grounding device respectively, utilizing varistor characteristics to suppress surge overvoltages caused by lightning, preventing accidents such as tripping, fires, and explosions.

[0003] However, as varistors age and encounter abnormal overvoltages, thermal breakdown inevitably occurs, leading to a continuous increase in the power frequency current passing through them. Surge protectors will inevitably fail. When they fail, their appearance is generally not significantly different from before the damage. Users need to frequently use dedicated leakage current detection equipment to test them in order to determine whether they have encountered power frequency overvoltage or whether the product has aged. This undoubtedly brings potential safety hazards and many inconveniences to users. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a surge protector for the protection of low-voltage overhead transmission lines, which has the advantages of obvious fusing performance, strong sealing and simple structure.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a surge protector for the protection of low-voltage overhead transmission lines, comprising: a main body, a flip cover, a tripping torsion spring, and a low-temperature electrode, wherein one side of the flip cover is hinged to one side of the bottom of the main body through the tripping torsion spring, and the low-temperature electrode is welded between the main body and the flip cover.

[0006] In one embodiment, the main body includes a varistor, a housing, and an encapsulation body. The varistor is disposed inside the housing, the low-temperature electrode is welded to the side of the varistor away from the top of the housing, and the encapsulation body is disposed between the varistor and the housing.

[0007] In one embodiment, the body further includes an input wire that passes through the housing to connect to the varistor.

[0008] In one embodiment, the end of the input wire away from the varistor is also covered with a protective cap.

[0009] In one of the embodiments, a first connecting member is further arranged on the pressure sensitive resistor, and the pressure sensitive resistor is connected with the input wire through the first connecting member.

[0010] In one of the embodiments, a second connecting member is further arranged in the shell, and the second connecting member is connected with the pressure sensitive resistor at a position away from the inner wall of the shell.

[0011] In one of the embodiments, the flip cover comprises a cover body and a protrusion, one side of the cover body is hinged with one side of the bottom of the main body, and the protrusion is arranged on the side of the cover body facing the main body and is welded with the low temperature electrode.

[0012] In one of the embodiments, a hinge shaft is arranged on the cover body, and a hinge part is arranged on the shell, and the hinge part and the hinge shaft are hinged.

[0013] In one of the embodiments, the tripping torsional spring is sleeved on the hinge shaft and abuts against the cover body and the hinge part respectively.

[0014] In one of the embodiments, a grounding wire is further connected with the low temperature electrode, the grounding wire penetrates through the cover body and is used for grounding.

[0015] The above-mentioned surge protector for low-voltage overhead transmission line protection has the following beneficial effects:

[0016] Firstly, when the surge protector is fused, i.e. after the low temperature electrode is melted, the main body and the flip cover are released from the welded relationship, the tripping torsional spring works to rotate the flip cover away from the main body, so as to achieve the effect that the fusing and the state change of the surge protector are simultaneous, and to achieve the warning effect, and when the surge protector is not fused, the whole can be kept closed to meet the needs of outdoor waterproof and snowproof;

[0017] Secondly, the overall structure is simple and has no redundant design, so that the surge protection effect and the eye-catching prompting effect can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic diagram of a surge protector for low-voltage overhead transmission line protection in a normal working state in the embodiment;

[0019] Figure 2 is a structure schematic diagram of a surge protector for low-voltage overhead transmission line protection in a fused state in the embodiment Figure 1 ;

[0020] Figure 3 is a structure schematic diagram of a surge protector for low-voltage overhead transmission line protection in a fused state in the embodiment Figure 2 ;

[0021] Figure 4 is Figure 3 is an enlarged view of A in FIG. 1;

[0022] Figure 5 is a cross-sectional structure schematic diagram of a surge protector in a normal working state for low-voltage overhead transmission line protection in the embodiment;

[0023] Figure 6 is a cross-sectional structure schematic diagram of a surge protector in a fuse state for low-voltage overhead transmission line protection in the embodiment.

[0024] In the figure: 1, main body; 11, pressure sensitive resistor; 12, shell; 121, hinged part; 13, package body; 14, input electric wire; 2, flip cover; 21, cover body; 211, hinged shaft; 22, protrusion; 3, tripping torsion spring; 4, low temperature electrode; 5, head protection sleeve; 6, first connecting piece; 7, second connecting piece; 8, ground wire. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below in combination with the drawings and embodiments.

[0026] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model, and do not indicate or imply 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 a limitation on the utility model.

[0027] In addition, the terms "first" and "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 indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, unless otherwise specifically limited.

[0028] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.

[0029] In the utility model, unless another definite provision and limitation, first feature "on" or "under" second feature can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature "on", "above" and "on" second feature can be first feature directly above or obliquely above second feature, or just indicate first feature horizontal height higher than second feature. First feature "under", "below" and "under" second feature can be first feature directly below or obliquely below second feature, or just indicate first feature horizontal height less than second feature.

[0030] A surge protector for low-voltage overhead transmission line protection, as shown in Figures 1-4 Including main body 1, flip 2, tripping torsional spring 3 and low temperature electrode 4, one side of flip 2 is hinged to the bottom side of main body 1 through tripping torsional spring 3, and low temperature electrode 4 is welded between main body 1 and flip 2.

[0031] The above design has the beneficial effects that when the surge protector is working normally, the main body 1 and the cover 2 are kept closed, and when affected by wind, snow and rain, etc., the internal devices of the surge protector can be protected and are not easy to be damaged; when the surge protector is fused, that is, the low-temperature electrode 4 is melted, the welding relationship between the main body 1 and the cover 2 will be released, and the tripping torsional spring 3 can act on the main body 1 and the cover 2 to cut off the protection circuit composed of the main body 1, the low-temperature electrode 4 and the cover 2. In the embodiment, the tripping torsional spring 3 is a torsional spring, and the elastic force generated by the torsional spring, in combination with the hinged relationship between the main body 1 and the cover 2, causes the cover 2 to rotate away from the main body 1, achieving the effect that the fuse and the state of the surge protector change simultaneously (in appearance), so as to achieve the warning effect. For some rural areas, some urban areas and rural-urban joint areas, etc., the warning effect of the surge protector when it fails is very important, because the maintenance and maintenance efforts in the above-mentioned areas are generally low, and the residents' living places are often close to low-voltage overhead power lines. When extreme weather, nearby flammable materials such as trees, overvoltage, product aging, etc. occur, the surge protector has a risk of fusing, and after fusing, there are often safety hazards such as power safety and fire. At this time, if the surge protector cannot achieve the warning effect, the residents will also be difficult to judge the safety of the surrounding environment without professional knowledge. Therefore, in the utility model, the change in shape of the fused surge protector will help non-professionals such as residents to judge the state of the surge protector, and then to judge the current environmental conditions, to inform professional personnel to come for maintenance, and to prevent further losses.

[0032] As shown in Figures 5-6 The main body 1 includes a pressure-sensitive resistor 11, a shell 12 and an encapsulating body 13, the pressure-sensitive resistor 11 is arranged in the shell 12, the low-temperature electrode 4 is welded to one side of the pressure-sensitive resistor 11 away from the top of the shell 12, and the encapsulating body 13 is arranged between the pressure-sensitive resistor 11 and the shell 12.

[0033] With the above design, in one embodiment, the shell 12 can play a mechanical protection to prevent some accidental collisions in the transportation or use environment, and can also resist various harsh natural and working environment factors, such as waterproof, dustproof, to prevent rain, dust, debris, etc. from entering the surge protector inside; the encapsulating body 13 is arranged between the pressure sensitive resistor 11 and the shell 12, which is equivalent to adding a buffer layer outside the pressure sensitive resistor 11. When subjected to external impact (such as mechanical collision, slight vibration, etc.), the encapsulating body 13 can absorb and disperse these impact forces, avoiding direct damage to the pressure sensitive resistor 11. The encapsulating body 13 can also provide certain insulation performance to prevent possible electrical short circuit between the pressure sensitive resistor 11 and the shell 12, because the shell 12 may have a charge due to factors such as static electricity accumulation, induced charge, etc. The encapsulating body 13 can isolate these charges to ensure the normal work of the pressure sensitive resistor 11 and improve the electrical safety of the surge protector.

[0034] As shown in Figures 5-6 The main body 1 also includes an input wire 14, which penetrates the shell 12 to connect with the pressure sensitive resistor 11. This direct connection method can minimize the connection resistance, so that the surge current can be more efficiently transmitted from the input wire 14 to the pressure sensitive resistor 11. For example, when encountering a strong surge current generated by lightning, low connection resistance can ensure that the surge protector responds quickly and timely guides the surge current into the pressure sensitive resistor 11 for processing, thereby better protecting the subsequent electrical equipment.

[0035] As shown in Figure 1 The end of the input wire 14 away from the pressure sensitive resistor 11 is also covered with a head protection sleeve 5. The head protection sleeve 5 can effectively prevent the wire head away from the pressure sensitive resistor 11 from being mechanically damaged. During the installation, movement and maintenance of the device, the wire head is easily affected by physical factors such as collision, bending and scratching, and the head protection sleeve 5 can avoid damage to the exposed part of the wire head, ensuring the integrity of the electrical connection.

[0036] As shown in Figures 5-6As shown, a first connector 6 is also provided on the varistor 11, and the varistor 11 is connected to the input wire 14 through the first connector 6. In this embodiment, the presence of the first connector 6 forms a stable connection structure between the varistor 11 and the input wire 14. This ensures that during long-term operation of the equipment, even if affected by factors such as vibration and temperature changes, the connection between the varistor 11 and the input wire 14 will not easily loosen or fall off; the first connector 6 is also capable of withstanding certain mechanical tension and pressure in terms of material and structure. This helps to cope with the pulling and twisting of the input wire 14 during installation and use, avoiding damage to the connection point. For example, during the wiring of the input wire 14, it may be necessary to bend or stretch the input wire 14 to a certain extent due to space constraints; the first connector 6 can ensure the integrity of the connection.

[0037] Furthermore, the first connector 6 ensures electrical compatibility between the varistor 11 and the input wire 14. It guarantees a smooth electrical transition between different materials (such as copper wire and zinc oxide varistor 11 in other embodiments), avoiding problems such as electrochemical corrosion and potential differences caused by material differences. This extends the lifespan of the connection and improves the overall reliability of the surge protector.

[0038] In other embodiments, the first connector 6 can also be made of copper alloy or silver-plated material, which can effectively reduce the contact resistance between the varistor 11 and the input wire 14. Lower contact resistance is crucial for the performance of the surge protector because high contact resistance during surge current flow can cause excessive heat to be generated at the connection point, reducing the efficiency of surge protection and potentially damaging the connection. For example, in the event of a large surge current generated by lightning, low contact resistance ensures that the surge current passes smoothly through the varistor 11 for processing, reducing energy loss.

[0039] like Figures 5-6 As shown, a second connector 7 is also provided inside the housing 12, and the end of the second connector 7 away from the inner wall of the housing 12 is connected to the varistor 11. With the above design, in one embodiment, the advantage is that the second connector 7 can provide a support point for the varistor 11 inside the housing 12. The connection between the second connector 7 and the varistor 11 allows the varistor 11 to be better fixed in a suitable position within the housing 12, preventing displacement due to equipment movement, vibration, or other external interference factors.

[0040] like Figures 5-6As shown, the flip cover 2 includes a cover body 21 and a protrusion 22, one side of the cover body 21 is hinged to one side of the bottom of the main body 1, and the protrusion 22 is arranged on the side of the cover body 21 facing the main body 1 and is welded with the low-temperature electrode 4. Through the above design, in one embodiment, the benefit is that through the welding of the protrusion 22 and the low-temperature electrode 4, the cover body 21 can be kept closed together with the bottom plate of the shell 12, further guaranteeing the overall sealing effect, playing a role in preventing wind, rain and snow, and protecting the inside of the surge protector in an outdoor environment. When the low-temperature electrode 4 melts due to the fusing of the surge protector, the hinge arrangement of the cover body 21 and the main body 1 can make the cover body 21 rotate away from the main body 1, achieving the effect of simultaneous change of the fusing and the state (appearance) of the surge protector, so as to achieve the warning effect.

[0041] As shown in Figures 3-4 The tripping torsional spring 3 is sleeved on the hinge shaft 211 and abuts against the cover body 21 and the hinge portion 121. In actual application, even if the flip cover 2 and the main body 1 have a hinged relationship, there may be a situation that the low-temperature electrode 4 has melted, and there is a pressure difference between the inside and outside of the main body 1, etc., so that the flip cover 2 cannot completely release the other connection relationship with the main body 1, and the surge protector still maintains the appearance state before fusing. Therefore, in actual application, the tripping torsional spring 3 is needed to strongly release the other connection relationship between the flip cover 2 and the main body 1, so as to finally release the overall sealing property and achieve the warning effect.

[0042] In the embodiment, the other connection relationship is specifically an abutting relationship (due to the welding of the low-temperature electrode 4 and the hinge between the flip cover 2 and the main body 1, part of the flip cover 2 and the main body 1 is in abutting relationship). The tripping torsional spring 3 is specifically a torsional spring. The torsional spring has a strong effect on the cover body 21 and the hinge portion 121 due to compression, but since the protrusion 22 arranged on the cover body 21 and the pressure-sensitive resistor 11 still maintain the welding relationship through the low-temperature electrode 4, the above-mentioned force can be offset. When the surge protector fuses, the above-mentioned offset effect ends with the melting of the low-temperature electrode 4. The torsional spring (i.e. the tripping torsional spring 3) on the hinge shaft 211 has a propelling effect on the cover body 21 and the hinge portion 121, finally making the flip cover 2 release the abutting relationship with the main body 1, changing the appearance state of the surge protector and achieving the warning effect.

[0043] As shown in Figure 5 The low-temperature electrode 4 is further connected with a grounding wire 8, the grounding wire 8 penetrates through the cover body 21 and is used for grounding. When a overvoltage event (such as lightning or surge overvoltage) occurs, the grounding wire 8 can guide the surge current out of the surge protector, thereby achieving the protection effect.

[0044] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A surge protector for low voltage overhead power line protection, characterized in that, The utility model relates to a low-temperature electrode, which is welded between the main body and the cover. The main body comprises a pressure-sensitive resistor, a shell and an encapsulating body, the pressure-sensitive resistor is arranged in the shell, the low-temperature electrode is welded to the side of the pressure-sensitive resistor away from the top of the shell, and the encapsulating body is arranged between the pressure-sensitive resistor and the shell.

2. A surge protector for protection of low voltage overhead power lines according to claim 1, characterized in that: The main body further comprises an input wire, which penetrates the shell to be connected with the pressure-sensitive resistor.

3. A surge protector for protection of low voltage overhead power lines according to claim 2, characterized in that: The end of the input wire away from the pressure-sensitive resistor is further covered with a head protective sleeve.

4. A surge protector for protection of low voltage overhead power lines according to claim 3, characterized in that: The pressure-sensitive resistor is further provided with a first connecting piece, and the pressure-sensitive resistor is connected with the input wire through the first connecting piece.

5. A surge protector for protection of low voltage overhead power lines according to claim 3, characterized in that: The shell is further provided with a second connecting piece, and the end of the second connecting piece away from the inner wall of the shell is connected with the pressure-sensitive resistor.

6. A surge protector for protection of low voltage overhead power lines according to claim 2, characterized in that: The cover comprises a cover body and a protrusion, the side of the cover body is hinged to the bottom side of the main body, and the protrusion is arranged on the side of the cover body facing the main body and is welded with the low-temperature electrode.

7. A surge protector for protection of low voltage overhead power lines according to claim 2, characterized in that: The cover body is provided with a hinge shaft, the shell is provided with a hinge part, and the hinge part and the hinge shaft are hinged.

8. A surge protector for protection of low voltage overhead power lines according to claim 7, characterized in that: The tripping torsional spring is sleeved on the hinge shaft and abuts against the cover body and the hinge part respectively.

9. A surge protector for protection of low voltage overhead power lines according to claim 8, characterized in that: The low-temperature electrode is further connected with a grounding wire, the grounding wire penetrates the cover body for grounding.

10. A surge protector for protection of low voltage overhead power lines according to claim 7, characterized in that: ​

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