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 comprises a belt body and an action rod, the action rod can move to be close to a trigger assembly along a first direction under the action of a spring, and the belt body is matched with the action rod to generate an action on the action rod along a direction opposite to the first direction. The situation that the thermal tripping assembly triggers thermal tripping false alarm due to deformation of the belt body can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of surge protector devices, and particularly relates to a thermal tripping component and a surge protector. Background Art

[0002] The function of a surge protector is to protect the circuit it is connected to. The surge protector is applied to a power supply circuit or a communication line. Its principle is to conduct and shunt the impact current through a varistor inside, so as to avoid damage to the devices on the power supply circuit or the communication line caused by the impact current. During daily use of the surge protector, the lightning protection components inside will generate losses, so that a leakage current continuously flows through the surge protector. The function of the thermal tripping module is to enable the surge protector to reliably disconnect from the protected circuit in time when a continuous small current flows through it.

[0003] In the traditional thermal tripping structure, the thermal tripping component and the lightning protection component are located in a shell to form a module head, and the triggering component and the circuit component, etc. are located in the base. The module head cooperates with the base to achieve the lightning protection function. The belt body of the thermal tripping component bends from one side of the ejector rod to the other side of the ejector rod, and the ejector rod abuts under the action of the spring force. When the welding between the belt body and the connection end near the upper part melts, the ejector rod pushes the belt body under the action of the spring to separate the belt body from the connection end. The ejector rod continues to move under the action of the spring, and the end thereof moves to disengage from the triggering component of the surge protector. After detecting the movement of the actuating rod, the triggering component sends an electrical signal.

[0004] The defect of the above solution is that the ejector rod maintains its normal state relying on the restraint of the belt body. When the module head is not mated with the base, the end of the actuating rod extends out of the shell. When it is subjected to an external force, causing the actuating rod to squeeze the belt body inward, the belt body may undergo plastic deformation. The actuating rod is always pushed by the spring, resulting in the length of the actuating rod extending out of the shell being shorter than the normal state. After the module head is assembled with the base, the triggering component cannot cooperate with the actuating rod normally, resulting in false alarms of thermal tripping. Summary of the Utility Model

[0005] On the one hand, the utility model provides a thermal tripping component, which can avoid the situation of false alarms of thermal tripping of the thermal tripping component due to the deformation of the belt body;

[0006] The thermal tripping component provided by the utility model includes a belt body and an actuating rod. The actuating rod can move in a first direction to approach the triggering component under the action of a spring. The belt body cooperates with the actuating rod to exert an action on the actuating rod in a direction opposite to the first direction.

[0007] Further, the two ends of the actuating rod along the first direction are respectively a first end and a second end. An abutting portion is provided between the first end and the second end on the actuating rod, and the abutting portion abuts against the belt body.

[0008] Further, the actuating rod is provided with an abutting block protruding perpendicular to the first direction. The end face of the abutting block facing the triggering assembly forms an abutting portion, and the abutting portion contacts the belt body.

[0009] Further, the abutting block is located on the side of the actuating rod close to the lightning protection element.

[0010] Further, the abutting portion is a curved surface with a gradually increasing slope along the first direction, and at least a part of the belt body fits with the abutting portion.

[0011] Further, the abutting block further includes two opposite first side wall surfaces and second side wall surfaces parallel to the first direction. The end with a smaller slope of the abutting portion is connected to the first side wall surface, and the end with a larger slope is connected to the second side wall surface. First conductive sheets and second conductive sheets are respectively provided at both ends of the belt body along the first direction. The first conductive sheet is located close to the first side wall surface, and the second conductive sheet is located close to the second side wall surface.

[0012] Further, the abutting portion is smoothly connected to the first side wall surface.

[0013] Further, the spring is connected to the actuating rod near the first end.

[0014] Further, a blocking block is provided on the belt body corresponding to the connection between the abutting portion and the second side wall surface. The blocking block protrudes from the side end surface of the belt body facing the abutting portion, and a blocking groove is formed between the blocking block and the end surface.

[0015] The surge protector provided by the present utility model includes a module head and a base. The module head includes a housing, and a thermal tripping assembly as described in any one of the above is provided in the housing. The actuating rod in the thermal tripping assembly can pass through an opening provided on the housing and cooperate with a triggering assembly in the base.

[0016] Beneficial effects

[0017] In order to avoid the situation that the belt body of the existing thermal trip assembly is deformed under the action of external force, causing the action rod to retract and triggering a false alarm of the thermal trip, the action rod in the thermal trip assembly of this scheme triggers the thermal trip alarm by approaching the trigger assembly, and the belt body restricts the action rod from approaching the trigger assembly. Therefore, during the assembly of the module head or when the other module head is not matched with the base, when the action rod is subjected to an external force in the opposite direction to the first direction, the retraction of the action rod is affected by the elastic force of the spring. Compared with the traditional scheme under the support of the belt body, the spring is not easy to produce plastic deformation. Therefore, the action rod can maintain the preset position where the thermal trip alarm is not triggered after the external force is removed, and because the action rod is moved and separated from the belt body when the action rod is subjected to an external force in the opposite direction to the first direction, the belt body will not be deformed when the action rod is subjected to an external force in the opposite direction to the first direction, thereby avoiding the situation that the thermal trip assembly triggers a false alarm of the thermal trip due to the deformation of the belt body. 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 structure of the thermal release assembly of the module head provided in the first and second embodiments of the utility model;

[0020] Figure 2 It is a partial structural schematic diagram of a module head provided in Embodiment 1 and Embodiment 2 of the present utility model.

[0021] Figure numbers: 1-acting rod; 2-abutment block; 3-abutment portion; 4-belt body; 5-first conductive sheet; 6-second conductive sheet; 7-spring; 8-first end; 9-second end; 10-lightning protection element; a-first direction. 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] Embodiment 1

[0024] like Figures 1 to 2 A thermal release assembly shown includes a belt body 4 and an action rod 1. The action rod 1 can move along a first direction a to approach a trigger assembly under the action of a spring 7. The belt body 4 cooperates with the action rod 1 to exert an action on the action rod 1 in a direction opposite to the first direction a.

[0025] In order to prevent the existing belt body 4 of the thermal trip assembly from deforming under the action of external force, causing the action rod 1 to retract and triggering a false alarm of the thermal trip, the spring 7 on the action rod 1 of the thermal trip assembly in this solution generates an elastic force along the first direction a on the action rod 1, and the action rod 1 can approach the trigger assembly along the first direction a. The trigger assembly includes a Hall sensor, a pressure sensor or a displacement sensor and other components that can monitor the approach of the action rod 1. The belt body 4 in this solution cooperates with the action rod 1. When the belt body 4 is not melted, it generates an action constraint on the action rod 1 in the direction opposite to the first direction a, so that the action rod 1 can overcome the elastic force of the spring 7 and remain in a position where the thermal trip alarm is not triggered.

[0026] That is, the way in which the action rod 1 in the thermal trip assembly of this scheme triggers the thermal trip alarm is opposite to that of the traditional scheme. The action rod 1 can trigger the thermal trip alarm by approaching the trigger assembly, and the belt body 4 limits the action rod 1 from approaching the trigger assembly. Therefore, when the action rod 1 is subjected to an external force in the opposite direction to the first direction a during the assembly of the module head or when other module heads are not matched with the base, the retraction of the action rod 1 is affected by the elastic force of the spring 7. Compared with the traditional scheme under the support of the belt body 4, the spring 7 is not easy to produce plastic deformation. Therefore, the action rod 1 can maintain the preset position where the thermal trip alarm is not triggered after the external force is removed, and because the action rod 1 moves and separates from the belt body 4 when the action rod 1 is subjected to an external force in the opposite direction to the first direction a, the belt body 4 will not be deformed when the action rod 1 is subjected to an external force in the opposite direction to the first direction a, thereby avoiding the situation in which the thermal trip assembly triggers a false alarm of the thermal trip due to the deformation of the belt body 4.

[0027] In an optional embodiment, the two ends of the action rod 1 along the first direction a are respectively a first end 8 and a second end 9 , and an abutment portion 3 is provided on the action rod 1 between the first end 8 and the second end 9 , and the abutment portion 3 abuts against the belt body 4 .

[0028] The belt body 4 cooperates with the action rod 1 near the middle of the rod shaft. The action rod 1 near the middle of the rod shaft refers to the part between the first end 8 and the second end 9 of the action rod 1. The abutment part 3 protrudes and is arranged in the middle of the rod shaft. The belt body 4 abuts against the abutment part 3 to form a constraint on the action rod 1.

[0029] Preferably, the action rod 1 is provided with an abutment block 2 protruding along a direction perpendicular to the first direction a, and an abutment portion 3 is formed on one end face of the abutment block 2 facing the trigger assembly. The belt body 4 passes through between the abutment block 2 and the trigger assembly, and a part of the belt body 4 close to the abutment block 2 contacts the abutment portion 3 formed at the end of the abutment block 2. The belt body 4 is fixed at both ends, and the action rod 1 abuts against the belt body 4 under the action of the spring 7.

[0030] Alternatively, the abutting portion 3 is recessed and provided at the middle part of the rod body, and a part of the belt body 4 passes through the groove where the abutting portion 3 is located and abuts against the inner wall surface of the abutting portion 3 to form a restraint on the operating rod 1.

[0031] In an alternative embodiment, the abutting block 2 is located on the side of the operating rod 1 close to the lightning protection element 10.

[0032] The operating rod 1 is located on one side of the lightning protection element 10 and forms a module head with the lightning protection element 10 through the connection of the structural members of the housing. An abutting block 2 is convexly provided on the side of the operating rod 1 close to the lightning protection element 10 along a direction perpendicular to the first direction a. The end face of the abutting block 2 facing the triggering assembly forms an abutting portion 3, that is, the abutting block 2 and the belt body 4 are located in the space formed between the lightning protection element 10 and the operating rod 1. The operating rod 1 and the lightning protection element 10 can form a restraint on the belt body 4 to prevent the belt body 4 from deviating in direction.

[0033] In an alternative embodiment, the abutting portion 3 is a curved surface with a gradually increasing slope along the first direction a, and at least a part of the belt body 4 is attached to the abutting portion 3.

[0034] The belt body 4 is inclined relative to the first direction a. To enable the belt body 4 to exert a restraint on the operating rod 1, the slope of the belt body 4 along the first direction a gradually increases near the abutting portion 3, so that the end face of the belt body 4 near the abutting portion 3 can exert an abutting force on the belt body 4 along the first direction a. To enable the abutting portion 3 to be attached to the belt body 4 and prevent the belt body 4 from deforming due to a large local pressure, the abutting portion 3 in this solution is a curved surface with a gradually increasing slope along the first direction a, and this curved surface is attached to the end face of the corresponding contact position of the belt body 4, so that the contact area between the two can be increased and the belt body 4 can be evenly stressed.

[0035] In an alternative embodiment, the abutting block 2 further includes two opposite first side wall surfaces and second side wall surfaces parallel to the first direction a. The end with a smaller slope of the abutting portion 3 is connected to the first side wall surface, and the end with a larger slope is connected to the second side wall surface. First conductive sheets 5 and second conductive sheets 6 are respectively provided at both ends of the belt body 4 along the first direction a. The first conductive sheet 5 is located near the first side wall surface, and the second conductive sheet 6 is located near the second side wall surface.

[0036] The first conductive sheet 5 is the external connection end of the module head. After the module head is mated with the base, it is connected to the grounding circuit structure arranged on the base. The second conductive sheet 6 is connected to the lightning protection element 10. The belt body 4 is connected to the second conductive sheet 6 through a material with a relatively low melting point and is fixedly connected to the first conductive sheet 5 at the other end. That is, in the direction perpendicular to the first direction a, the abutting block 2 is located between the first conductive sheet 5 and the second conductive sheet 6. The first conductive sheet 5 is located at the first side wall surface close to the abutting block 2, and the second conductive sheet 6 is located at the second side wall surface close to the abutting block 2. The slope of the belt body 4 in the first direction a is smaller near the first side wall surface, so the belt body 4 at this place can be closer to the first side wall surface. The slope of the belt body 4 in the first direction a gradually increases near the curved surface where the abutting portion 3 is located, and the belt body 4 at this place can fit with the curved surface where the abutting portion 3 is located.

[0037] In an alternative embodiment, the abutting portion 3 is smoothly connected to the first side wall surface.

[0038] In an alternative embodiment, the spring 7 is connected to the operating rod 1 near the first end 8.

[0039] A hole is formed on the end surface of the first end 8 of the operating rod 1. A part of the spring 7 is embedded in the hole, and the other part is exposed outside the hole and abuts against the structural member of the housing, generating an elastic force along the first direction a on the operating rod 1.

[0040] In an alternative embodiment, a blocking block is provided at the connection between the belt body 4 and the second side wall surface corresponding to the abutting portion 3. The blocking block protrudes from the side end surface of the belt body 4 facing the abutting portion 3, and a blocking groove is formed between the end surface.

[0041] The belt body 4 is inclined in the first direction a and abuts against the abutting portion 3, generating a supporting force in the direction opposite to the first direction a and a supporting force perpendicular to the first direction a on the abutting portion 3. To prevent the supporting force perpendicular to the first direction a from causing the operating rod 1 to shift, a blocking block is provided on the belt body 4 in this solution. The blocking block protrudes from the side end surface of the belt body 4 facing the abutting portion 3. Since the side end surface of the belt body 4 is inclined, a blocking groove is formed by the end surface at the edge of the blocking block and the side wall surface of the blocking block. The opening of the blocking groove faces the edge ridge structure formed by the connection between the curved surface where the abutting portion 3 is located and the second side wall surface. When the abutting block 2 abuts against the belt body 4, a part of the edge ridge structure cuts into the blocking groove through the opening of the blocking groove, and the inner wall of the blocking groove formed by the side wall surface of the blocking block generates a constraint on the second side wall surface of the abutting block 2. This constraint enables the blocking block to overcome the supporting force perpendicular to the first direction a generated by the belt body 4 on the abutting portion 3, thereby preventing the operating rod 1 from shifting.

[0042] Embodiment Two

[0043] Such as Figures 1 to 2A surge protector as shown includes a module head and a base. The module head includes a housing, and a thermal tripping component is provided inside the housing. The operating rod 1 in the thermal tripping component can pass through an opening formed in the housing and cooperate with a triggering component inside the base.

[0044] The base is provided with an installation cavity for cooperating with the module head. One end of the installation cavity is an installation opening for the module head to be inserted, and the other end is communicated with an intelligent box at the lower part of the base through a channel opening. A triggering component and a circuit component are provided inside the intelligent box. An opening is provided on the housing of the module head. After the module head is cooperated with the base, the channel opening on the base is cooperated and communicated with the opening on the module head. The operating rod 1 of the thermal tripping component inside the module head can sequentially pass through the through opening and the channel opening and extend into the intelligent box to cooperate with the triggering component inside the intelligent box.

[0045] The lightning protection element 10 is fixedly connected to the housing. The operating rod 1 is located on one side of the lightning protection element 10 and is slidably connected to the housing. The first conductive sheet 5 of the thermal tripping component extends out of the housing. The conductive ear on the other side of the lightning protection element 10 extends out of the housing. When the module head is cooperated with the base, the first conductive sheet 5 and the conductive ear can contact the grounding circuit structure member inside the base accordingly.

[0046] The spring 7 on the operating rod 1 generates an elastic force on the operating rod 1 along the first direction a. When the surge protector undergoes a thermal tripping action, the belt body 4 is separated from the second conductive sheet, and the constraint of the belt body 4 on the operating rod 1 disappears. The operating rod 1 moves along the first direction a under the elastic force of the spring 7, so that the triggering component sends an electrical signal to the circuit component, thereby triggering a thermal tripping alarm.

[0047] It should be noted that any of the above embodiments is for explaining the present invention rather than limiting the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a properly programmed computer. In the unit claims listing several devices, several of these devices can be embodied by the same hardware item. The use of the words first level, second level, previous, and next, etc. does not represent any order. These words can be interpreted as names.

[0048] The above embodiments are only suitable for explaining the present utility model, rather than limiting the present utility model. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also belong to the scope of the present utility model. The patent protection scope of the present utility model shall be defined by the claims.

Claims

1. A thermal tripping component, comprising a belt body (4) and an operating rod (1), characterized in that, The action lever (1) can move along the first direction (a) under the action of the spring (7) to approach the trigger assembly, and the belt body (4) cooperates with the action lever (1) to exert an action on the action lever (1) in the direction opposite to the first direction (a).

2. The thermal trip assembly according to claim 1, characterized in that, The two ends of the action lever (1) along the first direction (a) are respectively a first end (8) and a second end (9), and an abutting portion (3) is provided on the action lever (1) between the first end (8) and the second end (9), and the abutting portion (3) abuts against the belt body (4).

3. The thermal trip assembly according to claim 2, wherein The action lever (1) is provided with an abutting block (2) protruding perpendicular to the first direction (a), and an end face of the abutting block (2) facing the trigger assembly forms an abutting portion (3), and the abutting portion (3) contacts the belt body (4).

4. The thermal trip assembly according to claim 3, characterized in that, The abutting block (2) is located on the side of the action lever (1) close to the lightning protection element (10).

5. The thermal trip assembly according to claim 3, wherein, The abutting portion (3) is a curved surface with a gradually increasing slope along the first direction (a), and at least a part of the belt body (4) fits with the abutting portion (3).

6. The thermal trip assembly according to claim 5, wherein, The abutting block (2) further includes two opposite first side wall surfaces and second side wall surfaces parallel to the first direction (a). The end with a smaller slope of the abutting portion (3) is connected to the first side wall surface, and the end with a larger slope is connected to the second side wall surface. First conductive sheets (5) and second conductive sheets (6) are respectively provided at both ends of the belt body (4) along the first direction (a). The first conductive sheet (5) is located close to the first side wall surface, and the second conductive sheet (6) is located close to the second side wall surface.

7. The thermal trip assembly according to claim 6, wherein The abutting portion (3) is smoothly connected to the first side wall surface.

8. The thermal release component according to claim 2, wherein The spring (7) is connected to the action lever (1) near the first end (8).

9. The thermal trip assembly according to claim 6, wherein, The belt body (4) is provided with a blocking block corresponding to the connection between the abutting portion (3) and the second side wall surface. The blocking block protrudes on the end face of the belt body (4) facing the abutting portion (3), and a blocking groove is formed between the end face and the blocking block.

10. A surge protector, comprising a module head and a base, characterized in that, The module head includes a housing, and a thermal release assembly as described in any one of claims 1-9 is provided in the housing. The action lever (1) in the thermal release assembly can pass through an opening provided on the housing and cooperate with a trigger assembly in a base.

Images