A special protection device for lightning protection equipment and a surge protector equipped with the device.

Abstract

This utility model relates to a special protection device for lightning protection equipment and a surge protector equipped with the device. The device includes a base, a contact bracket, and a breaking contact. The contact bracket is rotatably mounted on the base. The breaking contact includes a first moving contact, a second moving contact, and a stationary contact. The first and second moving contacts are symmetrically and insulatedly spaced on the contact bracket, forming a parallel current-splitting double-contact structure. When the protection device is closed, the first and second moving contacts simultaneously contact the stationary contact. This utility model, through the design of a double-contact current-splitting structure, reduces the loss of a single contact, effectively improves the surge current withstand capability of the device, and ensures the stable operation of the lightning protection equipment.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection equipment technology, and in particular to a special protection device for lightning protection equipment and a surge protector equipped with the device. Background Technology

[0002] In the field of power system surge protection technology, SPD (Surge Protective Device) is an important device used to protect electrical equipment and systems from damage caused by transient overvoltages (such as surge voltages caused by lightning strikes, grid switching, or equipment failures). As a key component preventing thermal breakdown of surge protectors due to overcurrent, the operating characteristics of dedicated SPD protection devices directly affect the reliability of the entire lightning protection system. Traditional dedicated SPD protection devices generally adopt a single-contact mechanical breaking structure, which has significant technical drawbacks in practical applications:

[0003] (1) During long-term operation, single-contact contact systems are prone to abnormally increased contact resistance due to material oxidation, mechanical deformation or arc erosion. This not only reduces the operating accuracy of the protection device, but may also lead to a "virtual connection" state, causing the protection function to fail completely.

[0004] (2) When a short circuit fault or continuous overcurrent occurs in the system, the breaking speed is difficult to meet the requirements of millisecond-level rapid disconnection due to the action response mechanism of the single contact structure, resulting in the fault current lasting too long and easily causing irreversible thermal damage to the SPD body.

[0005] (3) The existing single-contact architecture has insurmountable technical contradictions at the physical structure level. Improving the breaking speed often requires sacrificing contact stability, while enhancing contact reliability will restrict the action response time. This mutual constraint makes it impossible for traditional technical solutions to achieve synergistic optimization of fast breaking capability and high reliable contact characteristics. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, this utility model provides a special protection device for lightning protection equipment and a surge protector equipped with the device. By designing a dual-contact shunt, it reduces the loss of a single contact, improves the stability of the contact structure, extends the service life of the device, reduces the maintenance frequency, and can effectively improve the lightning protection capability of electronic equipment, ensuring the stable operation of the equipment and data security.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A special protection device for lightning protection equipment includes a base, a contact bracket, and a disconnecting contact. The contact bracket is rotatably mounted on the base. The disconnecting contact includes a first moving contact, a second moving contact, and a stationary contact. The first moving contact and the second moving contact are symmetrically and insulatedly spaced on the contact bracket to form a parallel current-splitting double-contact structure. The stationary contact is fixedly mounted on the base. When the protection device is closed, the first moving contact and the second moving contact simultaneously contact the stationary contact.

[0009] Furthermore, a rotating hole is provided on the base, and the contact bracket is provided with a bracket body and a first rotating shaft. The first rotating shaft passes through the bracket body and is rotatably connected with the rotating hole, so that the bracket body is rotatably installed on the base.

[0010] Furthermore, the first moving contact and the second moving contact are configured as conductors including a first end and a second end, the first end overlapping with the stationary contact, and the second end having a through hole;

[0011] The contact support has a first mounting groove and a second mounting groove symmetrically formed on both sides, with an intermediate partition formed between the first and second mounting grooves. The mounting shaft passes through the intermediate partition and is placed in the first and second mounting grooves on both sides respectively. The second ends of the first and second moving contacts are respectively inserted into the first and second mounting grooves, and the mounting shaft passes through the through hole at the second end. The second ends of the first and second moving contacts rotate around the axial direction of the mounting shaft. The lower ends of the first and second mounting grooves have a first opening and a second opening. The first opening is located at the end of the second opening away from the intermediate partition. The first and second moving contacts pass through the first and second openings in sequence and swing within the second opening.

[0012] Furthermore, a corresponding elastic torsion spring is provided on the outside of the through hole at the second end of the first moving contact and the second moving contact;

[0013] The elastic torsion spring includes a spring body, a first torsion arm and a second torsion arm disposed at both ends of the spring body. The spring body is sleeved on the mounting shaft and located outside the corresponding moving contact. The first torsion arm is connected in the mounting groove, and the second torsion arm extends downward from the corresponding mounting groove and has a bent portion. The bent portion is connected to the end of the corresponding moving contact away from the stationary contact, and always provides the moving contact with a torque to rotate toward the stationary contact.

[0014] Furthermore, the base is provided with a moving contact connecting electrode, which serves as the surge current input terminal of the device. The second ends of both the first moving contact and the second moving contact are connected to the moving contact connecting electrode via conductive cables.

[0015] Furthermore, the device also includes a linkage alarm module and a mechanical transmission component;

[0016] The mechanical transmission component is rotatably connected to the base. The top end of the mechanical transmission component is within the rotation range when the first and second moving contacts are disconnected. The bottom end of the mechanical transmission component is in contact with the metal spring sheet provided in the linkage alarm module. The metal spring sheet serves as the trigger end of the switching device in the linkage alarm module. When disconnected, at least one of the first and second moving contacts rotates and drives the mechanical transmission component to rotate. The mechanical transmission component presses down on the metal spring sheet and triggers the linkage alarm module.

[0017] Furthermore, the device also includes a second base that cooperates with the first base to form an intermediate receiving space. The first base has a first pair of plug-in and a second pair of plug-in respectively on both sides of the mechanical transmission component. The second base has a third pair of plug-in and a fourth pair of plug-in that cooperate with the first pair of plug-in and the second pair of plug-in.

[0018] The outer side of the base one is provided with multiple protrusions, and the outer side of the base two is provided with concave holes that match the protrusions. When multiple devices are assembled, they are positioned by means of the protrusions and concave holes.

[0019] A surge protector is provided with a dedicated protection device for the lightning protection equipment.

[0020] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0021] The lightning protection device designed in this utility model reduces the loss of a single contact by designing a dual-contact current shunt structure, improves the stability of the contact structure, extends the service life of the contact, achieves complementary interruption between the two contacts, avoids single-point failure, and greatly reduces the failure risk of the lightning protection system.

[0022] The lightning protection device designed in this utility model has a dual-contact structure that simultaneously closes and contacts the stationary contact when the circuit is closed, achieving parallel current shunting. This increases the lightning current carrying capacity of the device to twice that of the single-contact solution, improves the surge current withstand capability of the device, and better adapts to the application requirements of high-demand scenarios such as new energy and smart grids.

[0023] The lightning protection device designed in this utility model features an elastic torsion spring in its double-contact structure. This spring not only allows the moving contact to be mounted more stably on the contact support, but also provides a certain amount of elastic space for each moving contact during movement, thus maintaining a balance between the force applied and the force received by the moving contact. Attached Figure Description

[0024] Figure 1 A schematic diagram of the base and mounting components of the lightning protection device according to Embodiment 1 is shown.

[0025] Figure 2 It shows Figure 1 A schematic diagram of the structure of the first moving contact.

[0026] Figure 3 It shows Figure 1 A schematic diagram of the structure of the stationary contact.

[0027] Figure 4 It shows Figure 1 A schematic diagram of the structure of the middle contact support.

[0028] Figure 5 It shows Figure 4 A schematic diagram of the structure of a medium-elasticity torsion spring.

[0029] Figure 6 It shows Figure 1 A schematic diagram of the connection between the drive mechanism and the contact support.

[0030] Figure 7 It shows Figure 6 Exploded view of the drive mechanism.

[0031] Figure 8 It shows Figure 1 A schematic diagram of the structure of the central linkage alarm module.

[0032] Figure 9 It shows Figure 1 A schematic diagram of the structure of the central base.

[0033] Figure 10 It shows Figure 1 A schematic diagram of the structure of the second central base.

[0034] Marked in the attached diagram:

[0035] 1. Contact bracket; 11. Bracket body; 12. First rotating shaft; 13. First mounting groove; 14. Second mounting groove; 15. Intermediate spacer; 16. Mounting shaft; 17. First positioning shaft; 18. Second positioning shaft; 131. First opening; 132. Second opening;

[0036] 2. Breaking contact; 21. First moving contact; 22. Second moving contact; 23. Stationary contact; 211. Through hole;

[0037] 3. Drive mechanism; 31. Lock; 32. Jumper; 33. Reset component; 34. Handle; 35. U-shaped connecting rod; 36. Reset tension spring;

[0038] 4. Elastic torsion spring; 41. Spring body; 42. First torsion arm; 43. Second torsion arm; 44. Bending part;

[0039] 5. Mechanical transmission components; 51. Second rotating shaft;

[0040] 61. Metal shrapnel;

[0041] 7. Moving contact connecting electrode; 71. Conductive cable;

[0042] 10. Base 1; 100. Rotating hole; 101. First pair of inserts; 102. Second pair of inserts; 103. Reset component window;

[0043] 20. Base 2; 201. Third pair of plugins; 202. Fourth pair of plugins. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0045] Example 1

[0046] This utility model proposes a special protection device for lightning protection equipment, which is applicable to various lightning protection electronic devices on the market, such as surge protectors and SPD intelligent monitoring devices.

[0047] This embodiment takes its application in a surge protector as an example, such as... Figures 1 to 10 As shown, the device mainly includes: a receiving space composed of base 10 and base 20, a contact bracket 1, a breaking contact 2, a drive mechanism 3, and a linkage alarm module installed on base 10. Figure 2 and Figure 3 As shown, the disconnecting contact 2 includes a first moving contact 21, a second moving contact 22, and a stationary contact 23. The stationary contact 23 is fixed in position. The first moving contact 21 and the second moving contact 22 have the same structure and are installed independently. They are symmetrically and insulatedly spaced on the contact support 1, forming a parallel current-splitting double-contact structure. When the protection device closes, the first moving contact 21 and the second moving contact 22 simultaneously contact the stationary contact 23, forming a parallel path. The moving contact is configured as a conductor including a first end and a second end. The first end is a free end used to connect to the stationary contact 23, and the second end has a through hole 211.

[0048] like Figure 1 , Figure 4 and Figure 10 As shown, the contact bracket 1 includes a bracket body 11, a first rotating shaft 12, a first positioning shaft 17, and a second positioning shaft 18. The bracket body 11 is not limited to a simple plate structure; it can be designed as an integral structure with a certain depth in both the longitudinal and transverse directions, composed of multiple irregularly shaped plates, according to specific needs. In this embodiment, the end of the bracket body 11 where the moving contact is installed is configured as an inverted T-shape. A rotating hole 100 is provided on the base 10. The first rotating shaft 12 passes through the bracket body 11 and is rotatably connected to the rotating hole 100, thereby rotatably mounting the bracket body 11 on the base 10. Under normal circumstances, the double-contact structure and the stationary contact 23 are in closed contact. In case of an abnormal situation, the contact bracket 1 is driven by the drive mechanism 3 to disengage from the stationary contact 23, thereby disconnecting the circuit and achieving the purpose of protecting the surge protector.

[0049] In this embodiment, the portion of the contact bracket 1 that mounts the moving contact includes the following structure: a first mounting groove 13, a second mounting groove 14, an intermediate spacer 15, and a mounting shaft 16. The first mounting groove 13 has a first opening 131 and a second opening 132, and the structure of the second mounting groove 14 is mirror-symmetrical to that of the first mounting groove 13. The mounting shaft 16 passes through the intermediate spacer 15 and is positioned on both sides within the first mounting groove 13 and the second mounting groove 14, respectively. The second ends of the first moving contact 21 and the second moving contact 22 rotate around the axial direction of the mounting shaft 16. The first opening 131 is located at the end of the second opening 132 away from the intermediate spacer 15. The first moving contact 21 and the second moving contact 22 pass through the first opening 131 and the second opening 132 in sequence and swing within the second opening 132. A corresponding elastic torsion spring 4 is provided on the outside of the through hole 211 at the second end of each moving contact.

[0050] like Figure 5 , Figure 6 As shown, the elastic limiting component uses an elastic torsion spring 4, including a spring body 41, a first torsion arm 42 and a second torsion arm 43 disposed at both ends of the spring body 41, and the second torsion arm 43 having a bent portion 44. The spring body 41 is sleeved on the mounting shaft 16 and located outside the corresponding moving contact. The first torsion arm 42 extends upward from the corresponding first opening 131, and the second torsion arm 43 extends downward from the corresponding second opening 132. The bent portion 44 is connected to the end of the corresponding moving contact away from the stationary contact 23, and always provides the moving contact with a torque that rotates towards the stationary contact 23. The two moving contacts are installed independently and do not affect each other, and each is provided with a separate elastic torsion spring 4, which makes the moving contact installation stable and improves the reliability of the double contact overlap.

[0051] like Figure 1 , Figure 6 , Figure 7As shown, in this embodiment, the drive mechanism 3 includes a latch 31, a jump latch 32, and a reset member 33, which form a linkage structure, mounted on the bracket body 11, and a handle 34, a U-shaped connecting rod 35, and a reset spring 36, mounted on the base 10. The latch 31 is configured as a teardrop-shaped cam structure with a hook. An installation hole is provided on the cam structure. It is fixed to the bracket body 11 of the contact bracket 1 through the cooperation of the first positioning shaft 17 and the installation hole, and is simultaneously bridged and linked with the handle 34 through the U-shaped connecting rod 35. The second positioning shaft 18 passes through the contact bracket 1, and the jump latch 32 and the reset member 33 are respectively installed at both ends of the second positioning shaft 18. The jump latch 32 engages with the adjacent surface of the latch 31 and bridges with the adjacent surface of the reset member 33. The handle 34 provides a manual release method. The release of the latch 31 can be configured to be driven by an electromagnetic release device or other types of release devices. The structure of the release device can adopt a conventional structural design, which will not be described in detail here. The breaking action of the dual-contact structure of this utility model can be set to trigger the contact breaking based on the current threshold, forming a redundant protection mechanism without a distinction between primary and secondary protection.

[0052] Furthermore, compared to a design scheme with a moving contact, even if the actual overall contact area of ​​the moving contact and the stationary contact 23 is the same, their actual performance will differ, mainly in the following aspects:

[0053] a. Distribution of lightning current passing through

[0054] One moving contact: Current will be concentrated through one contact, which may cause local overheating or accelerated wear of that contact; Two moving contacts: Current can be distributed through two contacts, and each contact will bear a smaller current density, which helps to reduce the risk of overheating and wear.

[0055] b. Redundancy

[0056] One moving contact: If poor contact or a fault occurs, the entire circuit may be interrupted; two moving contacts: Even if one contact fails, the other contact can still work, providing redundancy and increasing the reliability of the system.

[0057] c. Arc extinguished

[0058] When the SPD dedicated protection device trips, an electric arc may be generated between the moving and stationary contacts. The two moving contacts can more effectively disperse the arc, reduce the damage to the contacts caused by the arc, and help extinguish the arc quickly.

[0059] d. Mechanical strength

[0060] Two moving contacts may have higher mechanical strength and be better able to withstand external stress and vibration, thus extending their service life.

[0061] e. Lightning current withstand capability

[0062] Although the overall contact area is the same, due to the current shunting effect, each of the two moving contacts may experience a smaller surge of lightning current, thus making it more likely to withstand a larger lightning current without failure. For example... Figure 1 As shown, the base 10 is provided with a moving contact connection electrode 7, which serves as the surge current input terminal of the device. The second ends of the first moving contact 21 and the second moving contact 22 are both connected to the moving contact connection electrode 7 through conductive cables 71. The conductive cables 71 connecting each moving contact are implemented using a multi-strand braided twisted pair.

[0063] like Figure 8 As shown, in this embodiment, the device adds remote signaling functionality by incorporating a mechanical transmission component 5 and a linkage alarm module. The middle portion of the mechanical transmission component 5 is rotatably connected to the base 10 via a second rotating shaft 51, forming a lever structure with the position of the second rotating shaft 51 as the fulcrum. The top end of the mechanical transmission component 5 is positioned within the rotation range when the first moving contact 21 and the second moving contact 22 break. Upon breaking, at least one of the first moving contact 21 and the second moving contact 22 rotates, driving the mechanical transmission component 5 to rotate. The mechanical transmission component 5 then presses down on the metal spring 61, triggering the linkage alarm module.

[0064] The bottom end of the mechanical transmission component 5 is equipped with a roller of a preset length. The roller contacts the trigger end of the intermodal alarm module, namely the metal spring 61, which makes the contact smoother and the signal triggering more stable.

[0065] When any moving contact breaks, the rotational displacement of the drive mechanism 3 drives the mechanical transmission component 5 to move synchronously, triggering the alarm function. The metal spring 61 helps the mechanical transmission component 5 to reset. The device of this utility model can be expanded with a built-in linkage alarm module, eliminating the need for external modules to realize related data acquisition and the space occupied by corresponding protection components. This improves the space utilization rate in the field, ensures safety and reliability, and is more convenient, practical and economical.

[0066] like Figure 9 , Figure 10As shown, the base 10 has a first pair of plug-in 101, a second pair of plug-in 102, and a reset window 103 on both sides of the mechanical transmission component 5. The base 20 has a third pair of plug-in 201 and a fourth pair of plug-in 202 at corresponding positions to cooperate with the first pair of plug-in 101 and the second pair of plug-in 102. Each pair of plug-in can have a female and male structure. For example, in this embodiment, the first pair of plug-in 101 is a male on the base 10, and the second pair of plug-in 102 is a female with a mounting hole. This allows for accurate and convenient installation of the base 10 and the base 20. At the same time, by setting the plug-in, the position of the mechanical transmission component 5 is limited within a specified range, making the contact between the mechanical transmission component 5 and the metal spring 61 of the linkage alarm module more reliable, and ensuring that the triggering operation is more accurate and reliable.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A special protective device for lightning protection equipment, characterized in that: It includes a base (10), a contact bracket (1), and a disconnecting contact (2). The contact bracket (1) is rotatably mounted on the base (10). The disconnecting contact (2) includes a first moving contact (21), a second moving contact (22), and a stationary contact (23). The first moving contact (21) and the second moving contact (22) are symmetrically and insulatedly spaced on the contact bracket (1) to form a parallel current-splitting double contact structure. The stationary contact (23) is fixedly mounted on the base (10). When the protection device is closed, the first moving contact (21) and the second moving contact (22) simultaneously contact the stationary contact (23).

2. The lightning protection device as described in claim 1, characterized in that: A rotating hole (100) is provided on the base (10). The contact bracket (1) is provided with a bracket body (11) and a first rotating shaft (12). The first rotating shaft (12) passes through the bracket body (11) and is rotatably connected to the rotating hole (100) to rotatably install the bracket body (11) on the base (10).

3. The lightning protection device as described in claim 1, characterized in that: The first moving contact (21) and the second moving contact (22) are configured as conductors including a first end and a second end, the first end is connected to the stationary contact (23), and the second end has a through hole (211). The contact bracket (1) has a first mounting groove (13) and a second mounting groove (14) symmetrically formed on both sides. An intermediate partition (15) is formed between the first mounting groove (13) and the second mounting groove (14). The mounting shaft (16) passes through the intermediate partition (15) and is placed in the first mounting groove (13) and the second mounting groove (14) on both sides respectively. The second ends of the first moving contact (21) and the second moving contact (22) are inserted into the first mounting groove (13) and the second mounting groove (14) respectively. The mounting shaft (16) passes through the through hole (21) at the second end. 1) The second ends of the first moving contact (21) and the second moving contact (22) rotate around the axial direction of the mounting shaft. The lower ends of the first mounting groove (13) and the second mounting groove (14) are provided with a first opening (131) and a second opening (132). The first opening (131) is located at the end of the second opening (132) away from the intermediate separator (15). The first moving contact (21) and the second moving contact (22) pass through the first opening (131) and the second opening (132) in sequence and swing within the second opening (132).

4. The lightning protection device as described in claim 3, characterized in that: A corresponding elastic torsion spring (4) is provided on the outside of the through hole (211) at the second end of the first moving contact (21) and the second moving contact (22); The elastic torsion spring (4) includes a spring body (41), a first torsion arm (42) and a second torsion arm (43) disposed at both ends of the spring body (41). The spring body (41) is sleeved on the mounting shaft (16) and located outside the corresponding moving contact. The first torsion arm (42) is connected in the mounting groove. The second torsion arm (43) extends downward from the corresponding mounting groove and has a bent portion (44). The bent portion (44) is connected to the end of the corresponding moving contact away from the stationary contact (23) and always provides the moving contact with a torque that rotates toward the stationary contact (23).

5. The lightning protection device as described in claim 3, characterized in that: The base (10) is provided with a moving contact connecting electrode (7) as the surge current input terminal of the device. The second ends of the first moving contact (21) and the second moving contact (22) are both connected to the moving contact connecting electrode (7) by a conductive cable (71).

6. The lightning protection device as described in claim 1, characterized in that: The device also includes a linkage alarm module and a mechanical transmission component (5). The mechanical transmission component (5) is rotatably connected to the base (10). The top of the mechanical transmission component (5) is located within the rotation range when the first moving contact (21) and the second moving contact (22) are disconnected. The bottom of the mechanical transmission component (5) is in contact with the metal spring (61) provided in the linkage alarm module. The metal spring (61) serves as the trigger end of the switching device in the linkage alarm module. When disconnected, at least one of the first moving contact (21) and the second moving contact (22) rotates and drives the mechanical transmission component (5) to rotate. The mechanical transmission component (5) presses down on the metal spring (61) and triggers the linkage alarm module.

7. The lightning protection device as described in claim 6, characterized in that: The device also includes a second base (20) that cooperates with the first base (10) to form an intermediate receiving space. The first base (10) is provided with a first pair of plugs (101) and a second pair of plugs (102) on both sides of the mechanical transmission component (5). The second base (20) is provided with a third pair of plugs (201) and a fourth pair of plugs (202) that cooperate with the first pair of plugs (101) and the second pair of plugs (102). The outer side of the base one (10) is provided with multiple bosses, and the outer side of the base two (20) is provided with concave holes that match the bosses. When multiple devices are assembled, they are positioned by the bosses and concave holes.

8. A surge protector, characterized in that: The lightning protection equipment is equipped with a dedicated protection device as described in any one of claims 1-7.

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