Thermal protector, plug and heater

Abstract

The invention relates to a thermal protector, a plug, a heater, a base, a first electrode plate, a second electrode plate and a connecting metal sheet, one end of the connecting metal sheet is electrically connected with the first electrode plate, and the other end of the connecting metal sheet is provided with a first connecting part which is used for being connected with the second electrode plate to conduct the first electrode plate and the second electrode plate; the base is internally provided with a deformed metal sheet which can be deformed after the temperature rises and cannot be automatically reset after being cooled, the base is movably connected with a manual reset piece used for pushing the deformed metal sheet to reset, and the deformed metal sheet can be reset only through external force after being heated and deformed by arranging the deformed metal sheet and the manual reset piece; therefore, the effect of reminding the user of checking the equipment fault is achieved, and the safety of equipment operation is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical appliance overheat protection devices, in particular to a thermal protector, a plug and a heating device. Background Art

[0002] A thermal protector (thermal protector) is a temperature-sensing element that acts on an electrical appliance. A thermal protector generally consists of two terminals, a movable metal sheet, and a thermally deformable metal sheet. The two terminals self-test and conduct electricity through the movable metal sheet. When the temperature rises and the deformation threshold of the thermally deformable metal sheet is exceeded, the thermally deformable metal sheet pushes the movable metal sheet through deformation, thereby disconnecting the electrical path between the two terminals.

[0003] Typically, the thermally deformed metal strips of a thermal protector automatically reset after cooling, reconnecting the electrical path between the two terminals. For example, patent publication number CN217405330U discloses an open-type protector, which specifically states, "When the temperature of the protected appliance drops to the rated reset temperature of the thermal protector, the first and second bimetallic strips return to their initial state, the contacts close, and the appliance resumes normal operation."

[0004] Since the first and second bimetallic strips will automatically reset to their initial state and close their contacts when the temperature drops to the rated reset temperature of the thermal protector, it is easy for users to forget to troubleshoot equipment failures, causing the equipment to restart without troubleshooting, posing a certain safety hazard.

[0005] Therefore, further improvement is needed. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a thermal protector. By setting a deformable metal sheet and a manual reset part, the deformed metal sheet must be reset by external force after being deformed by heat, thereby reminding users to check for equipment failures, thereby further improving the safety of equipment operation.

[0007] The object of the present invention is achieved like this: A thermal protector comprises a base, a first electrode sheet, a second electrode sheet and a connecting metal sheet, wherein one end of the connecting metal sheet is electrically connected to the first electrode sheet, and the other end of the connecting metal sheet is provided with a first connecting portion for connecting to the second electrode sheet so as to conduct electricity between the first and second electrode sheets; a deformable metal sheet is provided in the base which can be deformed when the temperature rises and will not automatically reset after cooling; and a manual reset component is movably connected to the base for pushing the deformed metal sheet to reset.

[0008] When the deformable metal sheet is deformed by heat, the deformed metal sheet pushes the connecting metal sheet to displace the first connecting portion and the second electrode sheet so as to disconnect the first electrode sheet and the second electrode sheet.

[0009] When the manual reset member pushes the deformed metal sheet to reset, the first connecting portion is connected to the second electrode sheet so that the first electrode sheet and the second electrode sheet are electrically connected.

[0010] As a specific solution, one end of the connecting metal sheet, the first electrode sheet and the second electrode sheet are respectively connected and fixed to the base, the manual reset piece is columnar, and a guide hole corresponding to the manual reset piece is provided on the base. A convex edge portion for supporting the deformed metal sheet is provided above the corresponding guide hole on the manual reset piece, and the manual reset piece penetrates the deformed metal sheet and makes the deformed metal sheet abut against the convex edge portion.

[0011] As a specific solution, the base is provided with a limiting concave step corresponding to the convex edge portion, and the lower side of the convex edge portion abuts against the limiting concave step. The manual reset part moves upward to reset the deformed metal sheet and separate the convex edge portion upward from the limiting concave step.

[0012] As a specific solution, the deformed metal sheet is provided with an abutment portion that can contact the connecting metal sheet when it is thermally deformed, and the connecting metal sheet is provided with a protrusion protruding toward the deformed metal sheet. The abutment portion pushes the connecting metal sheet to displace the first connecting portion and the second electrode sheet through the protrusion.

[0013] The side of the corresponding protrusion on the connecting metal sheet facing away from the deformed metal sheet is hollowed out.

[0014] As a specific solution, a first limiting groove corresponding to the first electrode sheet is provided on the base, the width of the first limiting groove is equivalent to the width of the first electrode sheet, and the first electrode sheet is connected and fixed to the base via a locking member.

[0015] As a specific solution, a second limiting groove corresponding to the second electrode sheet is provided on the base, the width of the second limiting groove is equivalent to the width of the second electrode sheet, and the second electrode sheet is connected and fixed to the base via a locking member.

[0016] As a specific solution, the first connecting portion protrudes toward one side of the second electrode sheet, the second electrode sheet is provided with a second connecting portion, the second connecting portion protrudes toward one side of the connecting metal sheet, and the first connecting portion and the second connecting portion contact each other to make the first electrode sheet and the second electrode sheet conductive.

[0017] As a specific solution, a first bending portion is provided on the first electrode sheet at a position corresponding to the outer side of the base. The first bending portion is integrally formed with the first electrode sheet. The thickness of the first electrode sheet is H1, 0.35mm≤H1≤0.45mm.

[0018] As a specific solution, a second bending portion is provided on the second electrode sheet at a position corresponding to the outer side of the base. The second bending portion is integrally formed with the second electrode sheet. The thickness of the second electrode sheet is H2, 0.35mm≤H2≤0.45mm.

[0019] As a specific solution, the first electrode sheet is bent upward relative to the connecting metal sheet to form a shielding portion, the vertical projection of the shielding portion partially shields the connecting metal sheet, and the stroke of the manual reset member pushing the deformed metal sheet to reset is less than or equal to the distance between the manual reset member and the shielding portion.

[0020] The present invention also discloses a plug, comprising a shell and several groups of the above-mentioned thermal protectors. The shell is provided with an installation cavity corresponding to the thermal protector, and the thermal protector is connected to the shell through the installation cavity. The shell is provided with an extension hole corresponding to the manual reset part, and the manual reset part at least partially extends outward through the extension hole.

[0021] As a specific solution, the shell is connected to a face cover, and a clamping block is provided on the face cover at a position corresponding to the extension hole. The clamping block is embedded in the extension hole from top to bottom and cooperates with the manual reset member to limit the position.

[0022] The shell and the cover are detachably connected through a plug-in mechanism, which includes a plurality of plug-in posts and plug-in holes. The plug-in posts and the plug-in holes are plugged in one by one to fix the shell and the cover in position.

[0023] An insulating partition is provided between adjacent installation cavities in the shell, and the thermal protectors in different installation cavities are isolated from each other by the insulating partition.

[0024] The shell and the cover are respectively formed by injection molding. The shell is provided with a plurality of hollow parts, which are integrally formed with the shell. The cover is provided with a reinforcing rib part, which is integrally formed with the cover.

[0025] The present invention also discloses a heating device, comprising a main body and several groups of the above-mentioned thermal protectors. A mounting mechanism is provided between the main body and the base for fixing the thermal protectors on the heating device and allowing the airflow generated by the heating device to pass through the deformed metal sheet.

[0026] The beneficial effects of the present invention are: By providing a deformable metal sheet and a manual reset part, the deformed metal sheet must be reset by external force after being deformed by heat, thereby reminding users to check for equipment failures and further improving the safety of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of an embodiment of the present invention Figure 1 .

[0028] Figure 2A cross-sectional view of an embodiment of the present invention Figure 2 .

[0029] Figure 3 A cross-sectional view of an embodiment of the present invention Figure 3 .

[0030] Figure 4 A schematic diagram of the structure of an embodiment of the present invention Figure 1 .

[0031] Figure 5 A schematic diagram of the structure of an embodiment of the present invention Figure 2 .

[0032] Figure 6 A schematic diagram of the structure of an embodiment of the present invention Figure 3 .

[0033] Figure 7 Schematic diagram of the decomposition of an embodiment of the present invention Figure 1 .

[0034] Figure 8 Schematic diagram of the decomposition of an embodiment of the present invention Figure 2 .

[0035] Figure 9 It is an enlarged view of Example A of the present invention.

[0036] Figure 10 This is an enlarged view of Example B of the present invention.

[0037] Figure 11 This is an enlarged view of point C in embodiment of the present invention.

[0038] Figure 12 It is an enlarged view of point D of embodiment of the present invention.

[0039] Figure 13 This is an enlarged view of Example E of the present invention.

[0040] Figure 14 This is an enlarged view of point F in embodiment of the present invention.

[0041] Figure 15 Schematic diagram of the structure of a plug according to an embodiment of the present invention.

[0042] Figure 16 Schematic diagram of the decomposition of the plug according to the embodiment of the present invention Figure 1 .

[0043] Figure 17 Schematic diagram of the decomposition of the plug according to the embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] See also Figures 1-14 The thermal protector comprises a base 3, a first electrode sheet 1, a second electrode sheet 2 and a connecting metal sheet 4. One end of the connecting metal sheet 4 is electrically connected to the first electrode sheet 1, and the other end of the connecting metal sheet 4 is provided with a first connecting portion 41 for connecting to the second electrode sheet 2 to make the first electrode sheet 1 and the second electrode sheet 2 conductive. A deformable metal sheet 6 is provided in the base 3, which can be deformed when the temperature rises and will not automatically reset after cooling. The base 3 is movably connected to a manual reset part 5 for pushing the deformed metal sheet 6 to reset.

[0046] Specifically, the deformed metal sheet 6 itself has a temperature threshold for deformation due to heat. This temperature threshold can be obtained by the manufacturer through setting parameters such as the thickness and material of the deformed metal sheet 6 as needed, and can be obtained through experimental data, which can be understood by those skilled in the art.

[0047] Preferably, the deformed metal sheet 6 is formed by processing nickel-titanium alloy, which has high-temperature stability and good mechanical properties, and has the characteristic of one-way memory, that is, the deformed metal sheet 6 processed by nickel-titanium alloy will deform when heated, and will not automatically reset after cooling, and needs to be reset by external force.

[0048] When the deformable metal sheet 6 is deformed by heat, the deformed metal sheet 6 pushes the connecting metal sheet 4 to displace the first connecting portion 41 and the second electrode sheet 2 so as to disconnect the first electrode sheet 1 and the second electrode sheet 2 .

[0049] When the manual reset member 5 pushes the deformed metal sheet 6 to reset, the first connecting portion 41 is connected to the second electrode sheet 2 so that the first electrode sheet 1 and the second electrode sheet 2 are electrically connected.

[0050] like Figure 1 、 Figure 4 、 Figure 9 、 Figure 12 As shown, the first connecting portion 41 is connected to the second electrode sheet 2 , and the first electrode sheet 1 is electrically connected to the second electrode sheet 2 .

[0051] like Figure 2 、 Figure 5 、 Figure 10 、 Figure 13 As shown, the deformed metal sheet 6 pushes the connecting metal sheet 4 to move by thermal deformation, so that the first connecting portion 41 is separated from the second electrode sheet 2 .

[0052] like Figure 3 、 Figure 6 、 Figure 11 、 Figure 14 As shown, the manual reset member 5 pushes the deformed metal sheet 6 to reset.

[0053] By providing the deformable metal sheet 6 and the manual reset member 5, the deformable metal sheet 6 can only be reset by external force after being deformed by heat, thereby reminding the user to check for equipment failures, thereby further improving the safety of equipment operation.

[0054] Preferably, the base 3 is formed by processing a plastic material, which can not only make the base 3 have a better insulation effect, but also optimize the material cost.

[0055] Furthermore, one end of the connecting metal sheet 4, the first electrode sheet 1 and the second electrode sheet 2 are respectively connected and fixed to the base 3, the manual reset member 5 is columnar, and a guide hole 31 corresponding to the manual reset member 5 is provided on the base 3. A convex edge portion 51 for supporting the deformed metal sheet 6 is provided at a position above the corresponding guide hole 31 on the manual reset member 5. The manual reset member 5 passes through the deformed metal sheet 6 and makes the deformed metal sheet 6 abut against the convex edge portion 51. When the deformed metal sheet 6 needs to be reset, the user only needs to push the manual reset member 5. Under the action of the guide hole 31, the manual reset member 5 has better stability when pushing the deformed metal sheet 6 and is not prone to accidental displacement.

[0056] Furthermore, a limiting recess 32 corresponding to the convex edge portion 51 is provided on the base 3, and the lower side of the convex edge portion 51 abuts against the limiting recess 32. The manual reset member 5 moves upward to reset the deformed metal sheet 6 and separate the convex edge portion 51 upward from the limiting recess 32. The cooperation between the limiting recess 32 and the convex edge portion 51 can further improve the installation accuracy of the manual reset member 5 and the base 3.

[0057] Furthermore, the deformed metal sheet 6 is provided with an abutment portion 61 which can contact the connecting metal sheet 4 when it is thermally deformed, and the connecting metal sheet 4 is provided with a protrusion 42 which protrudes toward the deformed metal sheet 6. The abutment portion 61 pushes the connecting metal sheet 4 to displace the first connecting portion 41 and the second electrode sheet 2 through the protrusion 42. The protrusion 42 can improve the structural strength of the connecting metal sheet 4. At the same time, the abutment portion 61 cooperates with the protrusion 42 to enable the deformed metal sheet 6 to better act on the connecting metal sheet 4 after being thermally deformed, so that the deformed metal sheet 6 can more effectively push the connecting metal sheet 4 to displace after being thermally deformed, thereby improving the reliability of the thermal protector.

[0058] The side of the connecting metal sheet 4 corresponding to the protrusion 42 facing away from the deformed metal sheet 6 is hollowed out, so that the protrusion 42 can be processed and formed more easily, while relatively reducing the consumables of the connecting metal sheet 4.

[0059] Furthermore, a first limiting groove 33 corresponding to the first electrode sheet 1 is provided on the base 3. The width of the first limiting groove 33 is equivalent to the width of the first electrode sheet 1. The first electrode sheet 1 is connected and fixed to the base 3 by a locking member, which can prevent the first electrode sheet 1 from accidentally rotating relative to the base 3, thereby further improving the stability of the connection between the first electrode sheet 1 and the base 3.

[0060] Furthermore, a second limiting groove 34 corresponding to the second electrode sheet 2 is provided on the base 3. The width of the second limiting groove 34 is equivalent to the width of the second electrode sheet 2. The second electrode sheet 2 is connected and fixed to the base 3 by a locking member, which can prevent the second electrode sheet 2 from accidentally rotating relative to the base 3, thereby further improving the stability of the connection between the second electrode sheet 2 and the base 3.

[0061] Furthermore, the first connecting portion 41 protrudes toward one side of the second electrode sheet 2, and the second connecting portion 21 is provided on the second electrode sheet 2, and the second connecting portion 21 protrudes toward one side of the connecting metal sheet 4. The first connecting portion 41 and the second connecting portion 21 contact each other to make the first electrode sheet 1 and the second electrode sheet 2 conductive, thereby increasing the contact area when the first electrode sheet 1 and the second electrode sheet 2 are electrically connected, and making the electrical connection effect more stable.

[0062] Furthermore, a first bending portion 11 is provided on the first electrode sheet 1 at a position corresponding to the outer side of the base 3. The first bending portion 11 is integrally formed with the first electrode sheet 1. The thickness of the first electrode sheet 1 is H1, 0.35mm≤H1≤0.45mm. The first bending portion 11 can improve the structural strength of the position of the first electrode sheet 1 corresponding to the outer side of the base 3. The first electrode sheet 1 is not easy to break at this position. At the same time, the thickness of the first electrode sheet 1 is relatively thick, which can further improve its own structural strength.

[0063] Furthermore, a second bending portion 22 is provided on the second electrode sheet 2 at a position adjacent to the outer side of the base 3. The second bending portion 22 is integrally formed with the second electrode sheet 2. The thickness of the second electrode sheet 2 is H2, 0.35mm≤H2≤0.45mm. The second bending portion 22 can improve the structural strength of the position adjacent to the outer side of the first electrode sheet 1 corresponding to the base 3. The second electrode sheet 2 is not easy to break at this position. At the same time, the thickness of the second electrode sheet 2 is relatively thick, which can further improve its own structural strength.

[0064] Furthermore, the first electrode sheet 1 is bent upward relative to the connecting metal sheet 4 to form a shielding portion 12, and the vertical projection of the shielding portion 12 partially blocks the connecting metal sheet 4. The manual reset member 5 pushes the deformed metal sheet 6 to reset, and the stroke is less than or equal to the distance between the manual reset member 5 and the shielding portion 12.

[0065] The shielding portion 12 can further improve the structural strength of the first electrode sheet 1. At the same time, it can also shield and protect the connecting metal sheet 4, making it less likely to be damaged by accidental collision during use or storage and transportation, thereby improving the product yield and reliability.

[0066] Moreover, the shielding portion 12 can also serve to limit the amplitude of the movement stroke of the manual reset member 5, thereby preventing the manual reset member 5 from having an excessive stroke when pushing the deformed metal sheet 6 to reset, thereby preventing the deformed metal sheet 6 from undergoing irreversible plastic deformation (i.e., the deformed metal sheet 6 cannot be restored to its original state).

[0067] See also Figure 15-17 The present invention also discloses a plug, including a shell 7 and several groups of thermal protectors. The shell 7 is provided with a mounting cavity corresponding to the thermal protector, and the thermal protector is connected to the shell 7 through the mounting cavity. The shell 7 is provided with an extension hole 71 corresponding to the manual reset member 5. The manual reset member 5 at least partially extends outward through the extension hole 71. During use of the plug, when the temperature is too high, the deformable metal sheet 6 will deform, causing the circuit to be disconnected, and then the user can reset it by manually controlling the manual reset member 5.

[0068] Furthermore, the shell 7 is connected to a face cover 8, and a snap-in block 81 is provided on the face cover 8 at a position corresponding to the extension hole. The snap-in block 81 is embedded in the extension hole 71 from top to bottom and cooperates with the manual reset member 5 to limit the position. The snap-in block 81 can not only improve the installation accuracy between the shell 7 and the face cover 8, but also improve the stability of the manual reset member 5 during movement.

[0069] Furthermore, the shell 7 and the face cover 8 are detachably connected via a plug-in mechanism, which includes a plurality of plug-in posts 91 and plug-in holes 92. The plug-in posts 91 and the plug-in holes 92 are plugged in one by one to fix the shell 7 and the face cover 8 in position, thereby simplifying the installation and connection structure between the shell 7 and the face cover 8 and enabling the two to be quickly disassembled and assembled.

[0070] Furthermore, an insulating partition 72 is provided between adjacent installation cavities in the shell 7, and the thermal protectors in different installation cavities are isolated from each other by the insulating partition 72, thereby avoiding short circuits between different thermal protectors and improving the safety of the equipment.

[0071] Furthermore, the shell 7 and the cover 8 are respectively formed by injection molding, and a plurality of hollow portions 73 are provided on the shell 7. The hollow portions 73 are integrally molded with the shell 7, so that the shell 7 is not easily shrunk and deformed after the injection molding is cooled.

[0072] The surface cover 8 is provided with a reinforcing rib portion 82 , which is integrally formed with the surface cover 8 to improve the structural strength of the surface cover 8 .

[0073] The present invention also discloses a heating device, including a main body (not shown in the figure) and several groups of thermal protectors. A mounting mechanism is provided between the main body and the base 3 for fixing the thermal protector on the heating device so that the airflow generated by the heating device can pass through the deformed metal sheet 6. The thermal protector can monitor the temperature of the heating device. When the hot air generated by the heating device or the operating temperature of the heating device itself is too high, the deformed metal sheet 6 will deform, causing the circuit to be disconnected, and then the user can reset it by manually controlling the manual reset part 5.

[0074] As an equivalent transformation, the thermal protector can also be applied to other commonly used household appliances that can generate hot air, such as hair dryers.

[0075] The above embodiments are only preferred embodiments of the present invention, and other embodiments of the present invention are also possible. Those skilled in the art may make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope set by the claims of this application.

Claims

1. A thermal protector comprising a base (3), a first electrode sheet (1), a second electrode sheet (2) and a connecting metal sheet (4), wherein one end of the connecting metal sheet (4) is electrically connected to the first electrode sheet (1), and the other end of the connecting metal sheet (4) is provided with a first connecting portion (41) for connecting to the second electrode sheet (2) to enable the first electrode sheet (1) and the second electrode sheet (2) to be electrically connected, characterized in that: The base (3) is provided with a deformable metal sheet (6) which is deformable when the temperature rises and does not automatically reset when cooled, and the base (3) is movably connected to a manual reset member (5) for pushing the deformed metal sheet (6) to reset. When the deformed metal sheet (6) is deformed by heat, the deformed metal sheet (6) pushes the connecting metal sheet (4) to displace the first connecting portion (41) and the second electrode sheet (2), thereby separating the first electrode sheet (1) and the second electrode sheet (2) and disconnecting the circuit; When the manual reset member (5) pushes the deformed metal sheet (6) to reset, the first connecting portion (41) is connected to the second electrode sheet (2), so that the first electrode sheet (1) and the second electrode sheet (2) are electrically connected.

2. The thermal protector according to claim 1, characterized in that: One end of the connecting metal sheet (4), the first electrode sheet (1) and the second electrode sheet (2) are respectively connected and fixed to the base (3); the manual reset member (5) is columnar; a guide hole (31) corresponding to the manual reset member (5) is provided on the base (3); a convex edge portion (51) for supporting the deformed metal sheet (6) is provided at a position above the corresponding guide hole (31) on the manual reset member (5); the manual reset member (5) passes through the deformed metal sheet (6) and causes the deformed metal sheet (6) to abut against the convex edge portion (51).

3. The thermal protector according to claim 2, characterized in that: The base (3) is provided with a limiting concave step (32) corresponding to the convex edge portion (51), and the lower side of the convex edge portion (51) abuts against the limiting concave step (32). The manual reset member (5) moves upward to reset the deformed metal sheet (6) and separate the convex edge portion (51) upward from the limiting concave step (32).

4. The thermal protector according to claim 1, characterized in that: The deformable metal sheet (6) is provided with an abutting portion (61) capable of contacting the connecting metal sheet (4) when the deformable metal sheet (6) is thermally deformed, and the connecting metal sheet (4) is provided with a protruding portion (42) protruding toward the deformable metal sheet (6). The abutting portion (61) pushes the connecting metal sheet (4) to move via the protruding portion (42), thereby separating the first connecting portion (41) from the second electrode sheet (2); The side of the corresponding protrusion (42) on the connecting metal sheet (4) facing away from the deformed metal sheet (6) is hollowed out.

5. The thermal protector according to claim 1, characterized in that: The base (3) is provided with a first limiting groove (33) corresponding to the first electrode sheet (1); the width of the first limiting groove (33) is equivalent to the width of the first electrode sheet (1); the first electrode sheet (1) is connected and fixed to the base (3) via a locking member; The base (3) is provided with a second limiting groove (34) corresponding to the second electrode sheet (2); the width of the second limiting groove (34) is equivalent to the width of the second electrode sheet (2); the second electrode sheet (2) is connected and fixed to the base (3) via a locking member.

6. The thermal protector according to claim 1, characterized in that: The first connecting portion (41) protrudes toward one side of the second electrode sheet (2); the second electrode sheet (2) is provided with a second connecting portion (21); the second connecting portion (21) protrudes toward one side of the connecting metal sheet (4); the first connecting portion (41) and the second connecting portion (21) contact each other, so that the first electrode sheet (1) and the second electrode sheet (2) are electrically connected.

7. The thermal protector according to claim 1, characterized in that: A first bending portion (11) is provided on the first electrode sheet (1) at a position corresponding to the outer side of the base (3); the first bending portion (11) and the first electrode sheet (1) are integrally formed; the thickness of the first electrode sheet (1) is H1, 0.35 mm ≤ H1 ≤ 0.45 mm; A second bent portion (22) is provided on the second electrode sheet (2) at a position corresponding to the outer side of the base (3); the second bent portion (22) and the second electrode sheet (2) are integrally formed; and the thickness of the second electrode sheet (2) is H2, 0.35 mm ≤ H2 ≤ 0.45 mm.

8. The thermal protector according to any one of claims 1 to 7, characterized in that: The first electrode sheet (1) is bent upward relative to the connecting metal sheet (4) to form a shielding portion (12); a vertical projection of the shielding portion (12) partially shields the connecting metal sheet (4); and a stroke of the manual reset member (5) pushing the deformed metal sheet (6) to reset is less than or equal to the distance between the manual reset member (5) and the shielding portion (12).

9. A plug comprising a housing (7) and several groups of thermal protectors according to any one of claims 1 to 8, characterized in that: The housing (7) is provided with a mounting cavity corresponding to the thermal protector, the thermal protector is connected and matched with the housing (7) via the mounting cavity, the housing (7) is provided with an extension hole (71) corresponding to the manual reset member (5), and the manual reset member (5) at least partially extends outward through the extension hole (71); The housing (7) is connected to a cover (8), and a clamping block (81) is provided on the cover (8) at a position corresponding to the extension hole. The clamping block (81) is embedded in the extension hole (71) from top to bottom and cooperates with the manual reset member (5) in a limiting manner. The shell (7) and the cover (8) are detachably connected via a plug-in mechanism, wherein the plug-in mechanism comprises a plurality of plug-in posts (91) and plug-in holes (92), and the plug-in posts (91) and the plug-in holes (92) are plugged in one by one to fix the shell (7) and the cover (8) in position; An insulating partition (72) is provided between adjacent installation cavities in the housing (7), and thermal protectors in different installation cavities are isolated from each other by the insulating partition (72); The shell (7) and the cover (8) are respectively formed by injection molding. The shell (7) is provided with a plurality of hollow portions (73), and the hollow portions (73) are integrally formed with the shell (7). The cover (8) is provided with a reinforcing rib portion (82), and the reinforcing rib portion (82) is integrally formed with the cover (8).

10. A heating device comprising a main body and several sets of thermal protectors according to any one of claims 1 to 8, characterized in that: A mounting mechanism is provided between the main body and the base (3) for fixing the thermal protector on the warm air device and enabling the airflow generated by the warm air device to pass through the deformed metal sheet (6).

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