阅读说明：本技术 一种用ptc兼作基座的热保护器 (Thermal protector using PTC as base ) 是由 梁安明 于 2021-09-01 设计创作，主要内容包括：本发明涉及一种用PTC兼作基座的热保护器,其特点在于包括PTC基座、受热弯曲导电组件、动触点、第一铆钉、第二铆钉、定触点、第一接线端子、第二接线端子,PTC基座上分别开设有第一铆接孔、第二铆接孔,第一接线端子的一端通过第一铆钉铆接在第一铆接孔上,定触点设置在第一铆钉的端面上,受热弯曲导电组件的一端、第二接线端子的一端都通过第二铆钉铆接在第二铆接孔上,动触点设置在受热弯曲导电组件的另一端上并与定触点相接触。本发明能达到简化热保护器结构的目的,能制造出更小体积的热保护器,有助于降低热保护器的制造难度与制造成本,能提高热保护器的适用范围,该保护器的可靠性还十分高,能很好地满足实际使用的需求,其适用性十分强。(The invention relates to a thermal protector using PTC (positive temperature coefficient) as a base, which is characterized by comprising a PTC base, a thermal bending conductive component, a movable contact, a first rivet, a second rivet, a fixed contact, a first wiring terminal and a second wiring terminal, wherein the PTC base is respectively provided with a first riveting hole and a second riveting hole, one end of the first wiring terminal is riveted on the first riveting hole through the first rivet, the fixed contact is arranged on the end surface of the first rivet, one end of the thermal bending conductive component and one end of the second wiring terminal are riveted on the second riveting hole through the second rivet, and the movable contact is arranged on the other end of the thermal bending conductive component and is contacted with the fixed contact. The invention can achieve the purpose of simplifying the structure of the thermal protector, can manufacture the thermal protector with smaller volume, is beneficial to reducing the manufacturing difficulty and the manufacturing cost of the thermal protector, can improve the application range of the thermal protector, has very high reliability, can well meet the requirement of actual use, and has very strong applicability.)

1. A thermal protector using PTC as a base is characterized in that: the PTC heat-conducting device comprises a PTC base (1), a heat-bending conducting component (2), a movable contact (3), a first rivet (4), a second rivet (5), a fixed contact (6), a first connecting terminal (7) and a second connecting terminal (8), wherein the first riveting hole (11) and the second riveting hole (12) are respectively formed in two ends of the PTC base (1), the first rivet (4) and the second rivet (5) are both metal rivets, one end of the first connecting terminal (7) is riveted on the first riveting hole (11) through the first rivet (4), the fixed contact (6) is arranged on the end face of the first rivet (4), one end of the heat-bending conducting component (2) and one end of the second connecting terminal (8) are riveted on the second riveting hole (12) through the second rivet (5), the movable contact (3) is arranged at the other end of the heat-bending conducting component (2), and the movable contact (3) is contacted with the fixed contact (6).

2. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: the PTC riveting device is characterized in that an insulating layer (13) is coated on the outer surface of the PTC base (1), the circumferential surface of the first rivet (4) is tightly pressed on the hole wall of the first riveting hole (11), and the circumferential surface of the second rivet (5) is tightly pressed on the hole wall of the second riveting hole (12).

3. A thermal protector using a PTC doubling as a base as claimed in claim 2, wherein: the insulating layer (13) is respectively provided with a first contact port (131) and a second contact port (132) which penetrate through the surface of the PTC base (1), the first contact port (131) and the second contact port (132) are respectively located at the hole of the first riveting hole (11) and the hole of the second riveting hole (12), the width of the first contact port (131) is larger than the width of the hole of the first riveting hole (11), the width of the second contact port (132) is larger than the width of the hole of the second riveting hole (12), the first wiring terminal (7) is tightly pressed on the PTC base (1) on the inner side of the first contact port (131), and the second wiring terminal (8) is tightly pressed on the PTC base (1) on the inner side of the second contact port (132).

4. A thermal protector using a PTC doubling as a base as claimed in claim 2, wherein: the shortest distance between the hole wall of the first riveting hole (11) and the hole wall of the second riveting hole (12) is 5-6 mm.

5. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: a first copper sleeve (111) is embedded in the first riveting hole (11) or a first silver coating (112) is arranged on the hole wall of the first riveting hole (11), and the first rivet (4) is tightly pressed on the inner wall of the first copper sleeve (111) or the first silver coating (112); and a second copper sleeve (121) is embedded in the second riveting hole (12) or a second silver coating (122) is arranged on the hole wall of the second riveting hole (12), and the second rivet (5) is tightly pressed on the inner wall of the second copper sleeve (121) or the second silver coating (122).

6. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: the radial cross sections of the first riveting hole (11) and the second riveting hole (12) are non-circular, the first rivet (4) is matched with the first riveting hole (11), and the second rivet (5) is matched with the second riveting hole (12).

7. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: the heated and bent conductive assembly (2) comprises a movable contact piece (21), a bimetallic strip (22) and a support gasket (23), a limiting convex part (231) is arranged on the top surface of the support gasket (23), the bimetallic strip (22) and the movable contact piece (21) are sequentially stacked on the top surface of the PTC base (1), the middle part of the bimetallic strip (22) is pressed on the limiting convex part (231), one end of a second wiring terminal (8) is arranged on the bottom surface of the PTC base (1), a second rivet (5) sequentially penetrates through one end of the movable contact piece (21), one end of the bimetallic strip (22), one end of the support gasket (23), a second riveting hole (12) and one end of the second wiring terminal (8) and then is riveted, and the movable contact (3) is arranged at the other end of the movable contact piece (21).

8. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: the heated and bent conductive assembly (2) comprises a movable contact piece (21), a bimetallic strip (22) and a support gasket (23), wherein a limit convex part (231) is arranged on the top surface of the support gasket (23), a yielding hole (211) which vertically penetrates through the middle part of the movable contact piece (21) is formed in the middle part of the movable contact piece (21), the support gasket (23), the movable contact piece (21) and the bimetallic strip (22) are sequentially stacked on the top surface of the PTC base (1), the limit convex part (231) is arranged in the middle part of the bottom surface of the bimetallic strip (22) after penetrating through the yielding hole (211), one end of a second connecting terminal (8) is arranged on the bottom surface of the PTC base (1), and a second rivet (5) is riveted after sequentially penetrating through one end of the bimetallic strip (22), one end of the movable contact piece (21), one end of the support gasket (23), a second riveting hole (12) and one end of the second connecting terminal (8), the other end of the bimetallic strip (22) is connected with the other end of the movable contact strip (21), and the movable contact (3) is arranged at the other end of the movable contact strip (21).

9. A thermal protector using a PTC doubling as a base as claimed in claim 8, wherein: the other end of the movable contact spring (21) is provided with at least one flanging (212), and the flanging (212) is pressed on the top surface of the other end of the bimetallic strip (22) after being bent upwards.

10. A thermal protector using a PTC doubling as a base as claimed in claim 1, wherein: the fixed contact (6) is a silver coating.

Technical Field

The invention relates to the technical field of thermal protection, in particular to a thermal protector.

Background

At present, a thermal protector with a PTC generally comprises an insulating base, a bimetallic strip, a movable contact, a fixed contact piece, a PTC block, a conducting strip, a conducting pressing piece, a plurality of rivets and the like, wherein the conducting strip and the conducting pressing piece are used for realizing the conduction and the limit of the PTC block. Wherein, in order to make the movable contact piece realize stable being connected with the PTC piece, can set up more spacing hole groove on the insulator spindle to satisfy the installation location of PTC piece, conducting strip and conductive pressing piece. Therefore, the structure of the thermal protector is complex, the size of the thermal protector is large, the manufacturing difficulty and the manufacturing cost of the thermal protector are increased, and the application range of the thermal protector is narrow. Therefore, it is necessary to redesign the structure of the thermal protector.

Disclosure of Invention

The present invention is directed to solve the above problems and disadvantages, and to provide a thermal protector using PTC element as a base, which uses a PTC element and a first rivet having a fixed contact, and in which an insulating base, a fixed contact, a conductive plate, and a conductive pad can be directly omitted, thereby simplifying the structure of the thermal protector, facilitating the manufacture of a thermal protector having a smaller volume, and further facilitating the reduction of the manufacturing difficulty and the manufacturing cost of the thermal protector, and the improvement of the application range of the thermal protector.

The technical scheme of the invention is realized as follows:

a thermal protector using PTC (positive temperature coefficient) as a base is characterized by comprising a PTC base, a heated and bent conductive component, a movable contact, a first rivet, a second rivet, a fixed contact, a first wiring terminal and a second wiring terminal, wherein the two ends of the PTC base are respectively provided with a first riveting hole and a second riveting hole, the first rivet and the second rivet are metal rivets, one end of the first wiring terminal is riveted on the first riveting hole through the first rivet, the fixed contact is arranged on the end face of the first rivet, one end of the heated and bent conductive component and one end of the second wiring terminal are riveted on the second riveting hole through the second rivet, and the movable contact is arranged at the other end of the heated and bent conductive component and is used for enabling the movable contact to be in contact with the fixed contact.

Preferably, the PTC base is covered with an insulating layer on the outer surface thereof, the circumferential surface of the first rivet is pressed against the hole wall of the first riveting hole, and the circumferential surface of the second rivet is pressed against the hole wall of the second riveting hole.

Preferably, the insulating layer is provided with a first contact port and a second contact port which penetrate through the surface of the PTC base, and the first contact port and the second contact port are respectively located at the orifice of the first riveting hole and the orifice of the second riveting hole, the width of the first contact port is greater than the orifice width of the first riveting hole, the width of the second contact port is greater than the orifice width of the second riveting hole, the first wiring terminal is tightly pressed on the PTC base on the inner side of the first contact port, and the second wiring terminal is tightly pressed on the PTC base on the inner side of the second contact port.

Preferably, the shortest distance between the hole wall of the first riveting hole and the hole wall of the second riveting hole is 5-6 mm.

Preferably, a first copper sleeve is embedded in the first riveting hole or a first silver coating is arranged on the hole wall of the first riveting hole, and the first rivet is tightly pressed on the inner wall of the first copper sleeve or the first silver coating; and a second copper sleeve is embedded in the second riveting hole or a second silver coating is arranged on the hole wall of the second riveting hole, and the second rivet is tightly pressed on the inner wall of the second copper sleeve or the second silver coating.

Preferably, the radial cross sections of the first riveting hole and the second riveting hole are non-circular, the first rivet is matched with the first riveting hole, and the second rivet is matched with the second riveting hole.

Preferably, the heated and bent conductive assembly comprises a movable contact piece, a bimetallic strip and a support gasket, a limit convex part is arranged on the top surface of the support gasket, the bimetallic strip and the movable contact piece are sequentially stacked on the top surface of the PTC base, the middle part of the bimetallic strip is pressed on the limit convex part, one end of the second wiring terminal is arranged on the bottom surface of the PTC base, the second rivet sequentially penetrates through one end of the movable contact piece, one end of the bimetallic strip, one end of the support gasket, the second riveting hole and one end of the second wiring terminal and is riveted, and the movable contact is arranged at the other end of the movable contact piece.

Preferably, the heated and bent conductive assembly comprises a movable contact piece, a bimetallic strip and a support gasket, wherein a limit convex part is arranged on the top surface of the support gasket, a vertical through abdicating hole is formed in the middle part of the movable contact piece, the support gasket, the movable contact piece and the bimetallic strip are sequentially stacked on the top surface of the PTC base, the limit convex part is arranged on the middle part of the bottom surface of the bimetallic strip after penetrating through the abdicating hole, one end of the second connecting terminal is arranged on the bottom surface of the PTC base, the second rivet sequentially penetrates through one end of the bimetallic strip, one end of the movable contact piece, one end of the support gasket, the second riveting hole and one end of the second connecting terminal and is then riveted, the other end of the bimetallic strip is connected with the other end of the movable contact piece, and the movable contact is arranged on the other end of the movable contact piece.

Preferably, the other end of the movable contact spring is provided with at least one flanging edge, and the flanging edge is pressed on the top surface of the other end of the bimetallic strip after being bent upwards.

Preferably, the fixed contact is a silver plating layer.

The invention has the beneficial effects that: in the thermal protector of the present invention, the PTC base is used, and the fixed contact is directly provided on the end face of the first rivet. The PTC base can be used directly as a base for the thermal protector, while the first rivet can be used as a stationary contact. Like this can directly save insulating seat, fixed contact piece, conducting strip and conductive pressing piece on hot protector to can reach the purpose of simplifying hot protector structure, and can be convenient for like this produce the hot protector of small volume, and then help reducing the manufacturing degree of difficulty and the manufacturing cost of hot protector. The application of the thermal protector can obtain the advantages of saving raw materials, saving installation space, reducing assembly procedures, saving labor and the like, and the applicability of the thermal protector is very good. Because the PTC base is not required to be provided with a complex hole-groove structure, the PTC base is only required to meet reasonable creepage distance. This makes it possible to make the thermal protector smaller in size, thereby making it possible to improve the range of application of the thermal protector. By employing heated bending of the conductive member. The movable contact can be driven to be separated from the fixed contact after being heated, and the electric conduction function can be achieved, so that the movable contact and the fixed contact can be stably connected to a circuit to be protected, and the reliability and the applicability of the thermal protector can be improved. Because the first connecting terminal is riveted on the first riveting hole through the first rivet, the heated bent conductive component and the second connecting terminal are riveted in the second riveting hole through the second rivet, and the fixed contact and the movable contact are respectively positioned on the first rivet and the heated bent conductive component. Therefore, the fixed contact and the movable contact can be accurately and stably installed in place, the accuracy and the stability of the action of the movable contact can be ensured, and the reliability of the thermal protector is improved. By making both the first rivet and the second rivet metal rivets. Riveted stability and reliability can not only be guaranteed like this, can also be convenient for be connected to the circuit with the PTC base steadily to make the effect that the thermal protector can exert PTC well, the performance of this thermal protector is more reliable, and the reaction is more accurate, and this also helps improving the reliability and the suitability of this thermal protector, and this thermal protector can satisfy the demand of in-service use better. By placing the fixed contact on the end face of the first rivet. The thermal protector not only can facilitate the processing of the fixed contact, but also can facilitate the movable contact and the fixed contact to form stable and reliable contact, thereby being beneficial to further improving the reliability of the thermal protector. Because the heated bent conductive component and the PTC base are not blocked, when the PTC base participates in work and heats, the heat emitted by the PTC base can be better acted on the heated bent conductive component, so that the PTC protector can better play a role of PTC, and the reliability of the heat protector is very high.

Drawings

Fig. 1 is a schematic perspective view of a first thermal protector according to the present invention.

Fig. 2 is a schematic perspective view of a second thermal protector according to the present invention.

Fig. 3 is a perspective view of a third thermal protector according to the present invention.

Fig. 4 is a perspective view of a fourth thermal protector according to the present invention.

Fig. 5 is a schematic perspective view of a fifth thermal protector according to the present invention.

Fig. 6 is a schematic perspective view of a sixth thermal protector according to the present invention.

Fig. 7 is a schematic view of a disassembled structure of the first thermal protector of the present invention.

Fig. 8 is a schematic view of a second thermal protector according to the present invention in a disassembled configuration.

Fig. 9 is a schematic view of a third thermal protector according to the present invention in a disassembled configuration.

Fig. 10 is a schematic view of a disassembled structure of a fourth thermal protector according to the present invention.

Fig. 11 is a perspective view of a PTC base according to the present invention.

Fig. 12 is a second perspective view of the PTC base according to the present invention.

Fig. 13 is a third schematic perspective view of the PTC base according to the present invention.

Fig. 14 is a schematic sectional view of a PTC base according to the present invention.

Fig. 15 is a schematic view of the movable contact riveted on the movable contact piece in the invention.

Fig. 16 is a second schematic structural diagram of the movable contact riveted on the movable contact piece in the invention.

Fig. 17 is a schematic view of the structure of the invention in which the moving contact is welded to the moving contact piece.

Fig. 18 is a second schematic structural view of the movable contact welded to the movable contact piece in the present invention.

Fig. 19 is a schematic view of an assembly structure of the thermal protector and the protection box according to the present invention.

Fig. 20 is a schematic view of an assembly structure of the thermal protector and the protection box according to the present invention.

Detailed Description

As shown in fig. 1 and 7, the thermal protector using PTC to be used as a base according to the present invention includes a PTC base 1, a thermally bent conductive member 2, a movable contact 3, a first rivet 4, a second rivet 5, a fixed contact 6, a first connection terminal 7, and a second connection terminal 8, wherein, the two ends of the PTC base 1 are respectively provided with a first riveting hole 11 and a second riveting hole 12, the first rivet 4 and the second rivet 5 are both metal rivets, one end of the first connecting terminal 7 is riveted on the first riveting hole 11 through the first rivet 4, the fixed contact 6 is arranged on the end surface of the first rivet 4, one end of the heated and bent conductive component 2 and one end of the second connecting terminal 8 are riveted on the second riveting hole 12 through the second rivet 5, the movable contact 3 is provided on the other end of the heated bent conductive member 2 and makes the movable contact 3 contact with the fixed contact 6.

In the thermal protector of the present invention, the PTC base 1 is used, and the fixed contact 6 is directly provided on the end face of the first rivet 4. The PTC base 1 can be used directly as a base of a thermal protector, and the first rivet 4 can be used as a stationary contact. Like this can directly save insulating seat, fixed contact piece, conducting strip and conductive pressing piece on hot protector to can reach the purpose of simplifying hot protector structure, and can be convenient for like this produce the hot protector of small volume, and then help reducing the manufacturing degree of difficulty and the manufacturing cost of hot protector. The application of the thermal protector can obtain the advantages of saving raw materials, saving installation space, reducing assembly procedures, saving labor and the like, and the applicability of the thermal protector is very good. As the PTC base 1 is not required to be provided with a complex hole-groove structure, the PTC base 1 is only required to meet reasonable creepage distance. This makes it possible to make the thermal protector smaller in size, thereby making it possible to improve the range of application of the thermal protector.

The conductive member 2 is bent by using heat. The thermal protector not only can drive the movable contact 3 to be separated from the fixed contact 6 after being heated, but also can play a role of conducting electricity so as to stably connect the movable contact 3 and the fixed contact 6 to a circuit to be protected, thereby being beneficial to improving the reliability and the applicability of the thermal protector.

Because the first connecting terminal 7 is riveted on the first riveting hole 11 by the first rivet 4, and the heated and bent conductive component 2 and the second connecting terminal 8 are riveted in the second riveting hole 12 by the second rivet 5, and the fixed contact 6 and the movable contact 3 are respectively positioned on the first rivet 4 and the heated and bent conductive component 2. Therefore, the fixed contact 6 and the movable contact 3 can be accurately and stably installed in place, and the accuracy and the stability of the action of the movable contact 3 can be ensured, which is beneficial to improving the reliability of the thermal protector.

By making both the first rivet 4 and the second rivet 5 metallic rivets. Not only can guarantee riveted stability and reliability like this, can also be convenient for be connected to PTC base 1 in the circuit steadily to make the effect that the thermal protector can exert PTC well, the performance of this thermal protector is more reliable, and the reaction is more accurate, and this also helps improving the reliability and the suitability of this thermal protector, and this thermal protector can satisfy the demand of in-service use better.

By arranging the fixed contact 6 on the end face of the first rivet 4. Not only can the processing of the fixed contact 6 be convenient, but also the movable contact 3 and the fixed contact 6 can be conveniently in stable and reliable contact, which is beneficial to further improving the reliability of the thermal protector.

Because the heated and bent conductive component 2 is not blocked by the PTC base 1, when the PTC base 1 participates in work and generates heat, the heat emitted by the PTC base 1 can be better acted on the heated and bent conductive component 2, so that the function of PTC can be better played, and the reliability of the thermal protector is very high.

The first rivet 4 and the second rivet 5 are both copper rivets. Therefore, riveting can be facilitated, and the first rivet 4 and the second rivet 5 have good conductivity, so that the reliability of the thermal protector is improved.

As shown in fig. 19 and 20, in actual use, the thermal protector can be protected by a protection case 10 having an opening on one side and a cover 20, the PTC base 1 is fitted into the protection case 10 such that the other ends of the first and second connection terminals 7 and 8 are placed outside the protection case 10, and the cover 20 is fastened to the protection case 10. Thus, the thermal protector can be well protected.

As shown in fig. 1 and 11, the PTC base 1 is covered with an insulating layer 13 on the outer surface thereof, the circumferential surface of the first rivet 4 is pressed against the hole wall of the first staking hole 11, and the circumferential surface of the second rivet 5 is pressed against the hole wall of the second staking hole 12. The insulating layer 13 can play a role of coating and isolation to prevent the heated and bent conductive component 2 from directly contacting with the outer wall of the PTC base 1, so that the part of the PTC base 1 participating in the work is the PTC base 1 between the first riveting hole 11 and the second riveting hole 12. Just so need not reserve creepage distance on PTC base 1's surface, only need consider first riveting hole 11 and the distance between second riveting hole 12 and whether satisfy creepage distance, this just can be convenient for make PTC base 1 littleer to can further improve thermal protector's application scope. And thus it is possible to prevent conductive foreign matter on the outer wall of the PTC base 1 from affecting the working performance of the thermal protector, which contributes to further improving the reliability of the thermal protector.

The insulating layer 13 is a high-temperature-resistant insulating plastic layer (for example, the same material as a plastic insulating base of a conventional thermal protector). In production, an insulating plastic layer can be formed on the surface of the PTC base 1 by immersing the PTC base 1 in a molten insulating plastic and then taking out and cooling.

As shown in fig. 1 and 12 to 14, the insulating layer 13 is respectively provided with a first contact port 131 and a second contact port 132 penetrating through the surface of the PTC base 1, and the first contact port 131 and the second contact port 132 are respectively located at the orifice of the first riveting hole 11 and the orifice of the second riveting hole 12, the width of the first contact port 131 is greater than the orifice width of the first riveting hole 11, the width of the second contact port 132 is greater than the orifice width of the second riveting hole 12, the first connection terminal 7 is tightly pressed on the PTC base 1 inside the first contact port 131, and the second connection terminal 8 is tightly pressed on the PTC base 1 inside the second contact port 132. Through the opening of the first contact port 131 and the second contact port 132, the first connection terminal 7 and the second connection terminal 8 can be conveniently contacted with the outer surface of the PTC base 1, so that convenience and stability of the PTC base 1 connected to the thermal protector are improved, the PTC base 1 can better perform the function of the PTC, and the reliability and the applicability of the thermal protector are further improved.

As shown in fig. 14, the first riveting hole 11 and the second riveting hole 12 both penetrate through the PTC base 1. In an actual manufacturing process, the first contact 131 may be formed in the insulating layer 13 outside both the two apertures of the first riveting hole 11, or the first contact 131 may be formed in the insulating layer 13 outside only one of the apertures of the first riveting hole 11. Similarly, the second contact 132 may be formed in the insulating layer 13 outside both the two holes of the second riveting hole 12, or the second contact 132 may be formed in the insulating layer 13 outside only one of the holes of the second riveting hole 12.

And the shortest distance from the hole wall of the first riveting hole 11 to the hole wall of the second riveting hole 12 is 5-6 mm. Under guaranteeing to have reasonable creepage distance between first riveting hole 11 and second riveting hole 12 like this, can make PTC base 1 have very little volume again, can shorten 1/3 for the length of current small-size thermal protector, this can be convenient for use this thermal protector under less space to help further improving this thermal protector's application scope.

As shown in fig. 1, when the insulating layer 13 is provided with the first contact 131 and the second contact 132, the shortest distance from the contact position of the first connection terminal 7 and the PTC base 1 to the contact position of the second connection terminal 8 and the PTC base 1 is 5 to 6 mm. This allows good control of the overall volume of the thermal protector.

As shown in fig. 1, 12 to 14, a first copper sleeve 111 is embedded in the first riveting hole 11 or a first silver coating 112 is disposed on the hole wall of the first riveting hole 11, and the first rivet 4 is tightly pressed on the inner wall of the first copper sleeve 111 or the first silver coating 112; the second riveting hole 12 is embedded with a second copper sleeve 121, or a second silver coating 122 is arranged on the hole wall of the second riveting hole 12, and the second rivet 5 is tightly pressed on the inner wall of the second copper sleeve 121 or the second silver coating 122. The arrangement of the copper sleeve or the silver coating can improve the stability and the reliability of the electric connection between the first rivet 4 and the second rivet 5 and the PTC base 1, thereby being beneficial to further improving the reliability and the applicability of the thermal protector. And the copper sleeve can play the protective action of removal to the riveting hole.

As shown in fig. 8, the radial cross sections of the first riveting hole 11 and the second riveting hole 12 are non-circular, the first rivet 4 is matched with the first riveting hole 11, and the second rivet 5 is matched with the second riveting hole 12. By adopting the structure, the first rivet 4 and the second rivet 5 can be respectively and tightly embedded in the first riveting hole 11 and the second riveting hole 12, the purpose of preventing the first rivet 4 and the second rivet 5 from rotating can be achieved, the rotating situation of parts fixed by the first rivet 4 and the second rivet 5 can be avoided, the stability and the reliability of the installation and the positioning of the parts can be conveniently improved, and the reliability of the thermal protector can be further improved.

As shown in fig. 7 to 10, in an actual manufacturing process, the cross sections of the first staking hole 11 and the second staking hole 12 may be rectangular, pentagonal, hexagonal, elliptical, or the like. This prevents the rivet from rotating very well.

As shown in fig. 1, 3, 7, 9, 15 and 17, the thermally bent conductive assembly 2 includes a movable contact piece 21, a bimetal piece 22 and a support pad 23, a limit protrusion 231 is disposed on a top surface of the support pad 23, the bimetal piece 22 and the movable contact piece 21 are sequentially stacked on a top surface of the PTC base 1, a middle portion of the bimetal piece 22 is pressed on the limit protrusion 231, one end of the second connection terminal 8 is disposed on a bottom surface of the PTC base 1, the second rivet 5 is sequentially passed through one end of the movable contact piece 21, one end of the bimetal piece 22, one end of the support pad 23, the second riveting hole 12 and one end of the second connection terminal 8 and then riveted, and the movable contact 3 is disposed on the other end of the movable contact piece 21. The structure of the heated bending conductive component 2 is very simple and reliable, which not only can facilitate the manufacture, but also can improve the accuracy and stability of the action of the movable contact 3. Through the setting of the supporting gasket 23, not only can the processing of the limiting convex part 231 be convenient, but also the purpose of heightening the movable contact piece 21 can be achieved, so that a sufficient space can be ensured between the movable contact 3 and the PTC base 1 for the installation of the fixed contact, and the structural design of the movable contact piece 21, the bimetallic strip 22 and the PTC base 1 is not required to be too complicated, so that the purpose of simplifying the structure of the thermal protector can be achieved. Through the setting of spacing convex part 231, can play fine limiting displacement to the middle part of bimetallic strip 22 to when bimetallic strip 22 is heated and is out of shape, play the purpose of restriction bimetallic strip 22's middle part downstream, the other end that can guarantee bimetallic strip 22 like this can act on movable contact spring 21 more fast, this stability, accurate nature and the reliability that help improving movable contact spring 21 action, thereby help further improving this thermal protector's reliability and suitability. The bimetal strip 22 is riveted by the second rivet 5, so that falling off can be prevented, and safety is ensured.

As shown in fig. 2, 4 to 6, 8, 10, 16 and 18, the thermally bent conductive assembly 2 includes a movable contact piece 21, a bimetal piece 22 and a support pad 23, a limit protrusion 231 is disposed on a top surface of the support pad 23, a vertical through-going relief hole 211 is disposed in a middle portion of the movable contact piece 21, the support pad 23, the movable contact piece 21 and the bimetal piece 22 are sequentially stacked on a top surface of the PTC base 1, the limit protrusion 231 is disposed on a middle portion of a bottom surface of the bimetal piece 22 after passing through the relief hole 211, one end of the second connection terminal 8 is disposed on the bottom surface of the PTC base 1, the second rivet 5 is riveted after passing through one end of the bimetal piece 22, one end of the movable contact piece 21, one end of the support pad 23, the second riveting hole 12 and one end of the second connection terminal 8 in sequence, and the other end of the bimetal piece 22 is connected to the other end of the movable contact piece 21, the movable contact 3 is provided on the other end of the movable contact piece 21. The structure of the heated bending conductive component 2 is very simple and reliable, which not only can facilitate the manufacture, but also can improve the accuracy and stability of the action of the movable contact 3. Through the setting of the supporting gasket 23, not only can the processing of the limiting convex part 231 be convenient, but also the purpose of heightening the movable contact piece 21 can be achieved, so that a sufficient space can be ensured between the movable contact 3 and the PTC base 1 for the installation of the fixed contact, and the structural design of the movable contact piece 21, the bimetallic strip 22 and the PTC base 1 is not required to be too complicated, so that the purpose of simplifying the structure of the thermal protector can be achieved. Through the setting of spacing convex part 231, can play fine limiting displacement to the middle part of bimetallic strip 22 to when bimetallic strip 22 is heated and is out of shape, play the purpose of restriction bimetallic strip 22's middle part downstream, the other end that can guarantee bimetallic strip 22 like this can act on movable contact spring 21 more fast, this stability, accurate nature and the reliability that help improving movable contact spring 21 action, thereby help further improving this thermal protector's reliability and suitability. The bimetal strip 22 is riveted by the second rivet 5, so that falling off can be prevented, and safety is ensured.

As shown in fig. 7 to 10, with the above-described structure, the support pad 23 and the stopper protrusion 231 can be quickly processed by press working, thereby improving the convenience of processing.

As shown in fig. 15 to 18, the movable contact 3 includes a conductive block 31 and a silver-plated surface 32, the conductive block 31 is welded or riveted to the bottom surface of the other end of the movable contact piece 21, and the silver-plated surface 32 is provided on the lower surface of the conductive block 31. Therefore, the movable contact 3 can be ensured to have very good conductive performance, the movable contact 3 can be conveniently manufactured and processed, and can be conveniently contacted with the fixed contact 6, and the reliability of the thermal protector can be improved. When the conductive block 31 is installed by welding, the conductive block 31 does not need to be made too large, and the conductive block 31 does not need to pass through the movable contact piece 21, so that the conductive block 31 can be prevented from occupying the installation space of the bimetallic strip 22, the movable contact piece 21 can be conveniently made shorter, the bimetallic strip 22 can be conveniently made slightly larger, and the reliability of the thermal protector can be conveniently improved.

As shown in fig. 1, 2, 7, 8, 15 and 16, the conductive block 31 is riveted to the movable contact piece 21. As shown in fig. 3 to 6, 9, 10, 17 and 18, the conductive piece 31 is welded to the movable contact piece 21.

When the insulating layer 13 is formed on the PTC base 1, the supporting pad 23 may be made of a non-insulating material (e.g., a copper sheet or a steel sheet) or an insulating material (e.g., rubber). When the insulating layer 13 is not provided on the PTC base 1, in order to control the overall volume of the thermal protector, the supporting pad 23 is made of a high-temperature-resistant insulating material (e.g., rubber), so that the movable contact piece 21 can be communicated with the PTC base 1 only through the second rivet 5, thereby conveniently controlling the portion of the PTC base 1 participating in the work, and further, conveniently making the thermal protector as small as possible under the condition of satisfying the creepage distance.

As shown in fig. 2, 4 to 6, 8, 10, 16 and 18, the other end of the movable contact piece 21 is provided with at least one folded edge 212, and the folded edge 212 is bent upward and then pressed against the top surface of the other end of the bimetal piece 22. This makes it possible to easily connect the other end of the bimetal 22 to the other end of the movable contact piece 21, thereby contributing to the improvement of the convenience of the manufacturing process of the thermal protector. And such limiting action is very reliable, help improving the reliability of this hot protector. With the structure, the length of the movable contact piece 21 can be shortened, and the width of the bimetallic strip 22 can be increased during manufacturing, so that the purposes of reducing the volume of the thermal protector and improving the reliability of the thermal protector can be achieved.

As shown in fig. 4, the width of the folded edge 212 may be made the same as that of the movable contact piece 21. As shown in fig. 6, when one of the turned-over edges 212 is used and the width of the turned-over edge 212 is smaller than the width of the movable contact piece 21, the turned-over edge 212 is located on the middle of the end surface of the movable contact piece 21. As shown in fig. 5, when two turned-over edges 212 are used and the sum of the widths of the two turned-over edges 212 is smaller than the width of the movable contact piece 21, the two turned-over edges 212 are respectively located on the front and rear ends of the end surface of the movable contact piece 21. When two turned-over edges 212 are used, as shown in fig. 2, the two turned-over edges 212 may be located on both sides of the other end of the movable contact piece 21, respectively. The above structure can achieve a very good connection effect between the movable contact piece 21 and the bimetallic strip 22.

By using the PTC base 1, the function of the PTC can be realized. When the bimetal strip is in operation, the bimetal strip 22 can not reset, and the bimetal strip 22 can reset only after the power supply is cut off and the bimetal strip is placed for a period of time. The thermal protector can be reused.

The fixed contact 6 is a silver coating. This ensures that the fixed contact 6 has a very good electrical conductivity, which contributes to further improving the reliability of the thermal protector.