Thermal tripping assembly and surge protector

Abstract

The utility model relates to the field of surge protector equipment, and especially relates to a thermal tripping assembly and a surge protector. The thermal tripping assembly provided by the utility model is used for the surge protector and comprises an actuating rod and a breaking belt, the actuating rod is matched with a tripping spring and can move along a first direction, the actuating rod is provided with a channel structure, one end of the breaking belt is connected with a first connecting end located at one side of the actuating rod, and the other end of the breaking belt is connected with a second connecting end located at the other side of the actuating rod. The other end of the breaking belt penetrates through the channel structure and is connected with a second connecting end located on the other side of the action rod through a welding part, and the breaking belt abuts against the pushing face in the channel structure.

Description

Technical Field

[0001] The utility model relates to the field of surge protector equipment, in particular to a thermal trip component and a surge protector. Background Art

[0002] The function of a surge protector is to protect the lines it is connected to. The surge protector is used in power circuits or communication lines. Its principle is to conduct and shunt the impact current through the internal varistor, thereby preventing the impact current from damaging the equipment on the power circuit or communication line. During daily use, the lightning protection components inside the surge protector will be damaged, causing the leakage current to continue to flow through the surge protector. The function of the thermal release module is to enable the surge protector to be able to disconnect from the protected circuit in a timely and reliable manner when a continuous small current flows through it.

[0003] The traditional thermal release structure has two connecting ends spaced apart along the moving direction of the top rod, and the two connecting ends are respectively located on both sides of the moving path of the top rod, and the two ends of the breaking belt are connected to the two connecting ends. The breaking belt is located above the top rod and bends from one side of the top rod to the other side of the top rod. The top rod and the connecting end are offset by the spring force. When the welding between the breaking belt and the connecting end near the top melts, the top rod pushes the breaking belt under the action of the spring so that the breaking belt is separated from the connecting end. The role of the top rod in the above scheme is to separate the breaking belt from the connecting end by external force. The defect of this scheme is that after the breaking belt is separated from the connecting end, due to the elasticity of the breaking belt itself, it may cause the breaking belt to contact the connecting end again, causing the thermal release protection to fail. Utility Model Content

[0004] On the one hand, the utility model provides a thermal release assembly, which can reliably disconnect the disconnecting belt from the connecting end, and prevent the disconnecting belt and the connecting end from contacting again after disconnection;

[0005] On the other hand, the utility model provides a surge protector.

[0006] The thermal trip assembly provided by the utility model is used for a surge protector, and comprises an action rod and a breaking strip. The action rod cooperates with a trip spring to be able to move along a first direction. A channel structure is provided on the action rod. One end of the breaking strip is connected to a first connecting end located on one side of the action rod, and the other end passes through the channel structure and is connected to a second connecting end located on the other side of the action rod by a welding portion. The breaking strip abuts against a pushing surface in the channel structure.

[0007] Furthermore, the pushing surface is arranged to be inclined along the first direction.

[0008] Furthermore, the channel structure is provided with a second opening on the end face of one side of the action rod close to the second connecting end, and the end face of the action rod close to the second connecting end is also provided with a blocking section. Along the first direction, the blocking section and the second opening are arranged in sequence, and at least a part of the blocking section can move with the action rod to the corresponding second connecting end, and the pushing surface is connected to the blocking section corresponding to the second opening.

[0009] Furthermore, the channel structure is provided with a first opening on an end surface of one side of the action rod close to the first connecting end, and along the first direction, the first opening extends from a position corresponding to the shielding section to a position corresponding to the second opening.

[0010] Furthermore, a connecting section is provided on an end surface of the action rod close to the first connecting end at a position corresponding to the first connecting end. The connecting section and the first opening are arranged in sequence along the first direction, and one side of the pushing surface extends to connect with the connecting section.

[0011] Furthermore, the pushing surface is smoothly connected to the connecting section.

[0012] Furthermore, one side of the pushing surface extends to connect with the shielding segment, and a constraint portion is formed at the connection. In the first direction, the slope of the constraint portion is greater than the slope of the pushing surface.

[0013] Furthermore, a contact portion is provided on a side of the separating belt facing the restraining portion, and the contact portion abuts against the restraining portion along a first direction.

[0014] Furthermore, along the first direction, the actuating member has a first end and a second end relative to each other, a mating groove is provided on the end surface of the actuating member close to the first end, the trip spring is located in the mating groove, and a signal rod capable of mating with a signal device is provided on the end surface of the actuating member close to the second end, and the signal rod extends along the first direction.

[0015] The surge protector provided by the utility model comprises a lightning protection element, such as the thermal trip assembly as described in any one of the above items and the lightning protection element connected in series on the grounding loop where the surge protector is located.

[0016] Beneficial Effects

[0017] Compared with the traditional scheme in which the breaking belt relies on the push of the top rod to separate from the connecting end, there is a channel structure on the action rod in this scheme, and the pushing surface is located in the channel structure. The breaking belt passes through the channel structure, and the action rod generates a pushing force on the breaking belt through the pushing surface in the channel structure along the first direction. As the action rod moves, the breaking belt moves away from the second connecting end under the push of the pushing surface. Since the breaking belt and the first connecting end are always kept fixed, the breaking belt swings around the first connecting end. Under the action of the pushing surface of the channel structure, its free end moves away from the second connecting end in a direction perpendicular to the first direction. The channel structure moves close to the free end of the breaking belt as the action rod moves, and the part of the breaking belt close to the free end abuts against the inner wall of the channel structure, that is, the channel structure constrains the part of the breaking belt close to the free end, preventing the breaking belt from being reconnected to the second connecting end, and through the setting of the action rod stroke, the part of the breaking belt close to the second connecting end can completely enter the channel structure, and the part of the action member forming the channel structure forms a partition between the breaking belt and the second connecting end, preventing the breaking belt from being reconnected to the second connecting end. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the thermal release assembly provided in an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the connecting section side of the action rod provided by an embodiment of the utility model.

[0021] Figure numbers: 1-lightning protection element; 2-action rod; 3-breaking belt; 4-first connecting end; 5-second connecting end; 6-channel structure; 7-tripping spring; 8-shielding section; 9-connecting section; 10-pushing surface; 11-first opening; 12-second opening; 13-signal rod. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0023] Example

[0024] A thermal trip assembly, used for a surge protector, includes an operating rod 2 and a breaking strip 3. The operating rod 2 cooperates with a trip spring 7 to move in a first direction. A channel structure 6 is provided on the operating rod 2. One end of the breaking strip 3 is connected to a first connecting end 4 located on one side of the operating rod 2, and the other end passes through the channel structure 6 and is connected to a second connecting end 5 located on the other side of the operating rod 2 by a welding portion. The breaking strip 3 abuts against a pushing surface 10 in the channel structure 6.

[0025] In order to avoid the breaking belt 3 resetting and contacting the second connection end 5 again after the action rod 2 pushes the breaking belt 3 to separate from the second connection end 5, the two ends of the breaking belt 3 in this solution are respectively located on both sides of the action rod 2, and are connected to the corresponding first connection end 4 and the second connection end 5. The second connection end 5 in this solution is connected to the lightning protection element 1, and the first connection end 4 is connected to the circuit structure of the grounding circuit where the surge protector is located, so that the lightning protection element 1, the second connection end 5, the breaking belt 3 and the first connection end 4 are connected in series to form a grounding circuit that can pass the surge current. The action rod 2 in this solution generates a pushing force on the breaking belt 3 under the elastic force of the trip spring 7. Since the two ends of the breaking belt 3 are respectively connected to the first connection end 4 and the second connection end 5, the action rod 2 cannot push the breaking belt 3 to generate. When the surge protector is subjected to a continuous small current flowing through, the welding part between the breaking belt 3 and the second connection end 5 melts, and the action rod 2 pushes the breaking belt 3 through the pushing surface 10 under the action of the trip spring 7 so that the breaking belt 3 is separated from the second connection end 5. Compared with the traditional solution in which the breaking belt 3 is separated from the connecting end by the push of the top rod, there is a channel structure 6 on the action rod 2 in this solution, and the pushing surface 10 is located in the channel structure 6. The breaking belt 3 passes through the channel structure 6, and the action rod 2 generates a pushing force on the breaking belt 3 through the pushing surface 10 along the first direction. In the direction perpendicular to the first direction, the first connecting end 4 and the second connecting end 5 are respectively located on both sides of the action rod 2. After the breaking belt 3 is separated from the second connecting end 5, one end of the breaking belt 3 close to the second connecting end 5 forms a free end, and the other end remains fixed. With the movement of the action rod 2, the breaking belt 3 is pushed away from the second connecting end 5 by the pushing surface 10. Since the breaking belt 3 and the first connecting end 4 are always kept fixed, the breaking belt The belt 3 swings around the first connecting end 4, and under the action of the pushing surface 10 of the channel structure 6, its free end moves away from the second connecting end 5 in a direction perpendicular to the first direction. The channel structure 6 moves with the actuating rod 2 to approach the free end of the breaking belt 3, and the part of the breaking belt 3 close to the free end abuts against the inner wall of the channel structure 6, that is, the channel structure 6 constrains the part of the breaking belt 3 close to the free end, thereby preventing the breaking belt 3 from being reconnected to the second connecting end 5, and by setting the stroke of the actuating rod 2, the part of the breaking belt 3 close to the second connecting end 5 can completely enter the channel structure 6, and the part of the actuating member forming the channel structure 6 forms a partition between the breaking belt 3 and the second connecting end 5, thereby preventing the breaking belt 3 from being reconnected to the second connecting end 5.

[0026] In an optional embodiment, the pushing surface 10 is inclined along the first direction.

[0027] The two connecting ends of the thermal trip structure are spaced apart along the moving direction of the push rod, and the two connecting ends are respectively located on both sides of the moving path of the push rod. Therefore, the connecting line between the first connecting end 4 and the second connecting end 5 is inclined relative to the first direction, and the breaking band 3 used to connect the first connecting end 4 and the second connecting end 5 is also inclined relative to the first direction. In order to ensure the fit between the pushing surface 10 and the breaking band 3, the pushing surface 10 in this scheme is inclined relative to the first direction to avoid the abutment area between the action rod 2 and the breaking band 3 being small when the thermal trip structure is not tripped, resulting in excessive local pressure on the breaking band 3, and then causing local deformation or damage to the breaking band 3.

[0028] In an optional embodiment, a second opening 12 is provided on the end face of the channel structure 6 located on one side of the actuating rod 2 near the second connecting end 5, and a shielding section 8 is also provided on the end face of the actuating rod 2 near the second connecting end 5. Along the first direction, the shielding section 8 and the second opening 12 are arranged in sequence, and at least a portion of the shielding section 8 can move with the actuating rod 2 to the corresponding second connecting end 5, and the pushing surface 10 is connected to the shielding section 8 at the corresponding second opening 12.

[0029] A second opening 12 is provided on the end face of one side of the actuating rod 2 close to the second connecting end 5, and the end face area adjacent to the second opening 12 forms a shielding section 8. When the thermal tripping structure is not tripped, the actuating rod 2 does not move along the first direction. In the first direction, the second opening 12 is located between the second connecting end 5 and the shielding section 8, and the breaking belt 3 obliquely passes through the channel structure 6 through the second opening 12 and is connected to the second connecting end 5. When the breaking belt 3 is separated from the second connecting end 5, as the actuating rod 2 moves, the breaking belt 3 moves away from the second connecting end 5 under the push of the pushing surface 10. At this time, the second opening 12 on the action rod 2 first passes through the second connection end 5, and the shielding segment 8 then passes through the second connection end 5. Since the push surface 10 extends to the second opening 12 in the channel structure 6, the shielding segment 8 also extends to the second opening 12 on the end surface of the action rod 2 near the second connection end 5. The push surface 10 is inclined in the channel structure 6, so the push surface 10 and the shielding segment 8 enclose a baffle structure with a conical cross section. The distance between the push surface 10 and the shielding segment 8 is regarded as the thickness of the baffle structure. The closer the baffle structure is to the second opening 12, the smaller the thickness. When the shielding segment 8 passes through the second connection end 5, it can be regarded as the baffle structure corresponding to the second connection end 5. The part of the breaking belt 3 near the second connection end 5 is located in the channel structure 6. The baffle structure is between the breaking belt 3 and the second connection end 5, which prevents the breaking belt 3 from being reconnected to the second connection end 5.

[0030] In an optional embodiment, the channel structure 6 is provided with a first opening 11 on one end surface of the actuating rod 2 close to the first connecting end 4 , and the first opening 11 extends from the corresponding shielding section 8 to the corresponding second opening 12 along the first direction.

[0031] In the direction perpendicular to the first direction, the two openings opposite to each other in the channel structure 6 are respectively the first opening 11 and the second opening 12, and the two opposite end faces between the first opening 11 and the second opening 12 in the channel structure 6 are respectively the pushing face 10 and the bottom end face, wherein the bottom end face is perpendicular to the first direction, and the pushing face 10 is arranged obliquely relative to the first direction, that is, along the direction from the first opening 11 to the second opening 12, the channel structure 6 is a prism structure, the area at the second opening 12 is smaller, and the area at the first opening 11 is larger, and the fixing point of the breaking band 3 and the first connecting end 4 is located outside the first opening 11 and penetrates into the channel structure 6 through the first opening 11, and then obliquely penetrates out of the channel structure 6 through the second opening 12 and is connected to the second connecting end 5. When the breaking band 3 is separated from the second connecting end 5, as the action rod 2 moves, the breaking band 3 moves away from the second connecting end 5 under the push of the pushing face 10, and the free end of the breaking band 3 can swing out of the channel structure 6 through the first opening 11, and at this time, the breaking band 3 is all located on the side of the action rod 2 close to the first connecting end 4.

[0032] The main function of the first opening 11 is to facilitate the separation belt 3 to be completely moved out of the channel structure 6 after being separated from the second connection end 5, and to facilitate the assembly of the separation belt 3 and the second connection end 5. Specifically, the separation belt 3 is first connected to the first connection end 4, and then the action rod 2 is assembled in place, and the position is kept fixed, and the free end of the separation belt 3 is pushed toward the first opening 11 so that the part close to the free end enters the channel structure 6 through the first opening 11, and the part of the segmented belt located in the channel structure 6 is continued to be pushed, and it is further bent until the free end passes through the second opening 12 and overlaps with the second connection end 5, and finally the second connection end 5 is fixed to the separation belt 3 by welding or other methods, and the action rod 2 is released so that the pushing surface 10 is against the separation belt 3.

[0033] In an optional embodiment, a connecting section 9 is further provided on the end face of the action rod 2 close to the first connecting end 4 at a position corresponding to the first connecting end 4. Along the first direction, the connecting section 9 and the first opening 11 are arranged in sequence, and one side of the pushing surface 10 extends to connect with the connecting section 9.

[0034] A first opening 11 is provided on an end face of the action rod 2 close to the first connecting end 4, and an end face area adjacent to the first opening 11 forms a connecting section 9. When the thermal trip structure is not tripped, the action rod 2 does not move along the first direction. In the first direction, the connecting section 9 is located between the first connecting end 4 and the first opening 11. In a direction perpendicular to the first direction, there is a gap between the first connecting end 4 and the connecting section 9. After being fixed to the first connecting end 4, the breaking band 3 is located in the gap so that the side end face of the breaking band 3 facing the connecting section 9 is in contact with the connecting section 9, that is, the breaking band 3 in this scheme is in contact with the connecting section 9 and the pushing surface 10 in sequence along the first direction. When the breaking band 3 is detached from the second connecting end 5, as the action rod 2 moves, the breaking band 3 moves away from the second connecting end 5 under the action of the pushing surface 10 and the connecting section 9.

[0035] In an optional embodiment, the pushing surface 10 is smoothly connected to the connecting section 9 .

[0036] The pushing surface 10 and the connecting section 9 have a rounded transition so that when the actuating rod 2 moves, the part close to the free end of the dividing strip 3 gradually slides from the pushing surface 10 to the connecting section 9, and even slides to fit with the connecting section 9 through the rounded transition structure between the pushing surface 10 and the connecting section 9, thereby avoiding excessive local pressure causing jamming when the pushing surface 10 of the actuating rod 2 slides relative to the end face of the dividing strip 3, thereby affecting the movement of the actuating rod 2.

[0037] In an optional embodiment, one side of the pushing surface 10 extends to connect with the shielding segment 8 , and a constraint portion is formed at the connection. In the first direction, the slope of the constraint portion is greater than the slope of the pushing surface 10 .

[0038] The push surface 10 and the shielding section 8 have rounded transitions to form a restraining portion, so that when the breaking belt 3 and the second connecting end 5 remain fixed, the actuating rod 2 can abut against the breaking belt 3 along the first direction, thereby limiting the movement of the actuating rod 2. The restraining portion in this solution is a rounded structure, corresponding to the structural bending of the breaking belt 3 when passing through the channel structure 6 through the second opening 12.

[0039] The rounded transition structure between the pushing surface 10 and the shielding section 8 fits with the breaking belt 3 to prevent excessive local pressure from causing jamming when the pushing surface 10 of the actuating rod 2 slides relative to the end surface of the breaking belt 3, thereby affecting the movement of the actuating rod 2.

[0040] In an optional embodiment, an abutment portion is provided on a side of the separating belt 3 facing the constraining portion, and the abutment portion abuts against the constraining portion along the first direction.

[0041] The abutment portion is protrudingly arranged on the dividing strip 3, and the dividing strip 3 is inclined relative to the first direction. The abutment portion is located on a portion of the dividing strip 3 with a larger slope relative to the first direction, and is enclosed with a portion of the dividing strip 3 with a smaller slope relative to the first direction to form a matching position. The rounded transition structure between the pushing surface 10 and the blocking section 8 abuts on the matching position to form an abutment along the first direction.

[0042] Preferably, the separating strip 3 is punched to form the abutment portion.

[0043] In an optional embodiment, along the first direction, the actuating member has a first end and a second end relative to each other, a mating groove is provided on the end surface of the actuating member close to the first end, the release spring 7 is located in the mating groove, and a signal rod 13 capable of mating with the signal device is provided on the end surface of the actuating member close to the second end, and the signal rod 13 extends along the first direction.

[0044] When the disconnecting band 3 is not separated from the second connection end 5, the tripping spring 7 remains in a compressed state, and the tripping spring 7 generates an elastic force along the first direction on the action rod 2. The end of the signal rod 13 along the first direction can cooperate with the signal device of the surge protector. Preferably, the signal device includes a push switch, a Hall sensor or other elements that can convert the action signal of the signal rod 13 into an electrical signal, and convert the analog electrical signal into a digital electrical signal through the relevant circuit on the circuit board, and send it through a communication module, so that the host computer can obtain the status signal of the surge protector. When the surge protector is subjected to a continuous small current flow, the welding part between the disconnecting band 3 and the second connection end 5 melts, and the action rod 2 moves along the first direction under the action of the tripping spring 7, and pushes the disconnecting band 3 through the pushing surface 10 so that the disconnecting band 3 is separated from the second connection end 5. The signal rod 13 moves with the action rod 2 to cooperate with the signal device to output the electrical signal of the thermal tripping action.

[0045] The surge protector provided by the utility model comprises a lightning protection element 1, such as any one of the above-mentioned thermal trip components and the lightning protection element 1 connected in series on the grounding loop where the surge protector is located.

[0046] It should be noted that any of the above embodiments is illustrative of the present invention rather than limiting the present invention, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words primary, secondary, previous, and next, etc. does not indicate any order. These words may be interpreted as names.

[0047] The above implementation modes are only suitable for illustrating the present invention, but not for limiting the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A thermal release assembly for a surge protector, characterized in that: The invention comprises an actuating rod (2) and a breaking belt (3), wherein the actuating rod (2) cooperates with a release spring (7) to be movable in a first direction, a channel structure (6) is provided on the actuating rod (2), one end of the breaking belt (3) is connected to a first connecting end (4) located on one side of the actuating rod (2), and the other end passes through the channel structure (6) and is connected to a second connecting end (5) located on the other side of the actuating rod (2) by a welding portion, and the breaking belt (3) abuts against a pushing surface (10) in the channel structure (6); The pushing surface (10) is arranged to be inclined along a first direction; The channel structure (6) is provided with a second opening (12) on an end surface of the actuating rod (2) close to the second connecting end (5); the actuating rod (2) is also provided with a shielding section (8) on an end surface of the actuating rod (2) close to the second connecting end (5); the shielding section (8) and the second opening (12) are arranged in sequence along the first direction; at least a portion of the shielding section (8) can move with the actuating rod (2) to a position corresponding to the second connecting end (5); and the pushing surface (10) is connected to the shielding section (8) at a position corresponding to the second opening (12); The channel structure (6) is provided with a first opening (11) on an end surface of one side of the action rod (2) close to the first connection end (4); along a first direction, the first opening (11) extends from a position corresponding to the shielding section (8) to a position corresponding to the second opening (12).

2. The thermal release assembly according to claim 1, characterized in that: A connecting section (9) is further provided on an end surface of the action rod (2) close to the first connecting end (4) at a position corresponding to the first connecting end (4); the connecting section (9) and the first opening (11) are arranged in sequence along the first direction, and one side of the pushing surface (10) extends to connect with the connecting section (9).

3. The thermal release assembly according to claim 2, characterized in that: The pushing surface (10) is smoothly connected to the connecting section (9).

4. The thermal release assembly according to claim 1, characterized in that: One side of the pushing surface (10) extends to connect with the shielding section (8), and a constraint portion is formed at the connection. In the first direction, the slope of the constraint portion is greater than the slope of the pushing surface (10).

5. The thermal release assembly according to claim 4, characterized in that: A contact portion is provided on one side of the separating belt (3) facing the restraining portion, and the contact portion abuts against the restraining portion along a first direction.

6. The thermal release assembly according to claim 1, characterized in that: In the first direction, the action rod has a first end and a second end opposite to each other, a matching groove is provided on the end surface of the action rod close to the first end, the release spring (7) is located in the matching groove, and a signal rod (13) capable of matching with a signal device is provided on the end surface of the action rod close to the second end, and the signal rod (13) extends in the first direction.

7. A surge protector, comprising a lightning protection element (1), characterized in that: The thermal release assembly according to any one of claims 1 to 6 is connected in series with the lightning protection element (1) on the grounding loop where the surge protector is located.

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