A thermal protector

Abstract

The utility model discloses a thermal protector, including upper cover, bottom plate, insulating paper and bimetallic strip, wherein, the insulating paper includes main part, left edge part and right edge part, the main part is pasted with the upper end surface of bottom plate, left edge part is connected on the left end of main part and is turned over to be pasted with the lower end surface of bottom plate, right edge part is connected on the right end of main part and is turned over to be pasted with the lower end surface of bottom plate, the upper cover includes cover, left bending part and right bending part, the cover is located the upper of main part of insulating paper and with the upper surface of main part is opposite, left bending part is connected on the left end of cover and is bent to be close to the lower surface of left edge part, right bending part is connected on the right end of cover and is bent to be close to the lower surface of right edge part. The utility model can improve the firm degree of the connection between upper cover and bottom plate, and then is favorable to improve the reliability and stability of thermal protector.

Description

Technical Field

[0001] This utility model relates to a thermal protector. Background Technology

[0002] Currently, a thermal protector is a device used to protect electrical equipment from overheating damage. A thermal protector typically includes a top cover, a bottom plate, and insulating paper to separate the top cover and the bottom plate. For example, a thermal protector that is easy to maintain, disclosed in Chinese Patent No. CN205384986U, has a top cover, a bottom plate, and insulating paper. The top cover, bottom plate, and insulating paper are connected by upper and lower fixing posts. However, this connection structure makes the connection between the top cover and the bottom plate not firm enough, which will affect the reliability and stability of the product. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a thermal protector that can improve the firmness of the connection between the top cover and the bottom plate, thereby improving the reliability and stability of the thermal protector.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a thermal protector, comprising an upper cover, a base plate, insulating paper, and a bimetallic strip;

[0005] The insulating paper includes a main body, a left folded edge, and a right folded edge. The main body is attached to the upper end face of the base plate. The left folded edge is connected to the left end of the main body and folded over to be attached to the lower end face of the base plate. The right folded edge is connected to the right end of the main body and folded over to be attached to the lower end face of the base plate.

[0006] The top cover includes a cover body, a left bend, and a right bend. The cover body is located above the main body of the insulating paper and abuts against the upper surface of the main body. The left bend is connected to the left end of the cover body and bends to abut against the lower surface of the left folded edge. The right bend is connected to the right end of the cover body and bends to abut against the lower surface of the right folded edge.

[0007] The main body of the insulating paper has a through hole, and the bottom plate has a stationary contact point passing through the through hole;

[0008] The bimetallic strip has a recessed curved portion. One end of the bimetallic strip is connected to the cover body, and the other end of the bimetallic strip is connected to a moving contact located above the stationary contact and used to abut against the stationary contact.

[0009] Furthermore, the cover has a mounting cavity located above the main body of the insulating paper. The upper end of the stationary contact extends into the mounting cavity after passing through the through hole. Both the bimetallic strip and the moving contact are located in the mounting cavity.

[0010] Furthermore, the cover is provided with a welding boss that protrudes into the mounting cavity, and one end of the bimetallic sheet is welded to the welding boss.

[0011] Furthermore, the cover is provided with a limiting protrusion that protrudes into the mounting cavity. The limiting protrusion is used to abut against the upper surface of the bimetallic sheet and limit its movement when the bimetallic sheet is deformed by heat, thereby causing the moving contact to move to a position separated from the stationary contact.

[0012] Furthermore, a first wiring pin is provided on one end of the cover, and a second wiring pin is provided on one end of the base plate.

[0013] Furthermore, the first terminal has a first wire clamping terminal, which has a first left clamping lug, a first right clamping lug, and a first wire clamping groove for inserting a wire.

[0014] The first left pressure lug is located on one side of the first wire pressing groove and is used to bend and deform it to press the wire in the first wire pressing groove;

[0015] The first right pressure lug is located on the other side of the first wire pressing groove and is used to bend and deform it to press the wire in the first wire pressing groove;

[0016] The second terminal has a second crimping terminal, which has a second left crimping lug, a second right crimping lug, and a second crimping groove for inserting wires.

[0017] The second left pressure lug is located on one side of the second wire pressing groove and is used to bend and deform it to press the wire in the second wire pressing groove;

[0018] The second right pressure lug is located on the other side of the second wire groove and is used to bend and deform it to press the wire in the second wire groove.

[0019] Furthermore, the first terminal block also has a first connecting plate, one end of which is connected to the cover, and the first wire terminal is connected to the other end of the first connecting plate.

[0020] Furthermore, the opening of the first wire pressing groove is set upward, the first connecting plate is provided with an upward protruding first latch, and a first slot is provided between the first latch and the first connecting plate, with the opening of the first slot facing away from the first wire pressing terminal.

[0021] Furthermore, the second terminal block also has a second connecting plate, one end of which is connected to the base plate, and the second wire terminal is connected to the other end of the second connecting plate.

[0022] Furthermore, the opening of the second wire pressing groove is set upward, the second connecting plate is provided with an upward protruding second latch, and a second slot is provided between the second latch and the second connecting plate, the opening of the second slot being set away from the second wire pressing terminal.

[0023] After adopting the above technical solution, the left bend abuts against the lower surface of the left folded edge, pressing the left folded edge, the left end of the base plate, and the main body onto the cover. Similarly, the right bend abuts against the lower surface of the right folded edge, pressing the right folded edge, the right end of the base plate, and the main body onto the cover. This allows the base plate and the insulating paper to be stably and reliably connected to the upper cover, improving the strength of the connection between the upper cover and the base plate, and thus enhancing the reliability and stability of the thermal protector in this embodiment. The insulating paper is used to insulate and separate the upper cover and the base plate. At room temperature, the moving contact on the bimetallic strip maintains contact with the stationary contact. When the temperature rises to a set value, the bimetallic strip deforms, causing the moving contact to move away from the stationary contact. The recessed bend on the bimetallic strip allows it to better exhibit a curved structure, ensuring good contact between the moving contact and the stationary contact at room temperature. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the external structure of the thermal protector in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of the thermal protector in Embodiment 1 of this utility model;

[0026] Figure 3 This is an exploded view of the thermal protector assembly in Embodiment 1 of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the base plate in Embodiment 1 of this utility model;

[0028] Figure 5 This is a cross-sectional view of the thermal protector of this utility model;

[0029] Figure 6 This is a schematic diagram of the thermal protector in Embodiment 2 of this utility model;

[0030] Figure 7 This is a front view of the first and second terminals of this utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the present invention, showing the first and second terminals connected to a wire respectively.

[0032] In the diagram: 1. Top cover; 2. Base plate; 3. Insulating paper; 4. Bimetallic strip; 5. Main body; 6. Left folded edge; 7. Right folded edge; 8. Through hole; 9. Stationary contact; 10. Recessed bend; 11. Moving contact; 12. Positioning hole; 13. Mounting cavity; 14. Welding boss; 15. Limiting protrusion; 16. First left pressure ear; 17. First right pressure ear; 18. First wire pressing groove; 19. Second left pressure ear; 20. Second right pressure ear; 21. Second wire pressing groove; 22. First connecting plate; 23. First latch; 24. First slot; 25. Second connecting plate; 26. Second latch; 27. Second slot; 28. Wire. Detailed Implementation

[0033] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0034] Example 1

[0035] like Figures 1-5 As shown, a thermal protector includes an upper cover 1, a base plate 2, insulating paper 3, and a bimetallic strip 4;

[0036] The insulating paper 3 includes a main body 5, a left folded edge 6, and a right folded edge 7. The main body 5 is attached to the upper end face of the base plate 2. The left folded edge 6 is connected to the left end of the main body 5 and folded over to be attached to the lower end face of the base plate 2. The right folded edge 7 is connected to the right end of the main body 5 and folded over to be attached to the lower end face of the base plate 2.

[0037] The upper cover 1 includes a cover body, a left bend, and a right bend. The cover body is located above the main body 5 of the insulating paper 3 and abuts against the upper surface of the main body 5. The left bend is connected to the left end of the cover body and bends to abut against the lower surface of the left folded edge 6. The right bend is connected to the right end of the cover body and bends to abut against the lower surface of the right folded edge 7.

[0038] The main body 5 of the insulating paper 3 is provided with a through hole 8, and the bottom plate 2 is provided with a stationary contact 9 that passes through the through hole 8;

[0039] The bimetallic strip 4 has a recessed curved portion 10. One end of the bimetallic strip 4 is connected to the cover body, and the other end of the bimetallic strip 4 is connected to a moving contact 11 located above the stationary contact 9 and used to abut against the stationary contact 9. Specifically, after the left curved portion abuts against the lower surface of the left folded edge portion 6, it can press the left folded edge portion 6, the left end of the base plate 2, and the main body portion 5 onto the cover body. After the right curved portion abuts against the lower surface of the right folded edge portion 7, it can press the right folded edge portion 7, the right end of the base plate 2, and the main body portion 5 onto the cover body. This allows the base plate 2 and the insulating paper 3 to be stably and reliably connected to the upper cover 1, improving the firmness of the connection between the upper cover 1 and the base plate 2, and thus improving the reliability and stability of the thermal protector in this embodiment. In this embodiment, the insulating paper 3 is used to insulate and separate the upper cover 1 and the base plate 2. At room temperature, the moving contact 11 on the bimetallic strip 4 maintains contact with the stationary contact 9. When the temperature rises to a set value, the bimetallic strip 4 deforms, causing the moving contact 11 to move away from the stationary contact 9. The recessed curved portion 10 on the bimetallic strip 4 allows it to better exhibit a curved structure, thus ensuring good contact between the moving contact 11 and the stationary contact 9 at room temperature. The lower end face of the base plate 2 is provided with multiple positioning holes 12.

[0040] like Figures 1-5 As shown, the cover has a mounting cavity 13 located above the main body 5 of the insulating paper 3. The upper end of the stationary contact 9 extends into the mounting cavity 13 after passing through the through hole 8. The bimetallic strip 4 and the moving contact 11 are both located in the mounting cavity 13.

[0041] like Figures 1-5 As shown, the cover is provided with a welding boss 14 protruding into the mounting cavity 13, and one end of the bimetallic sheet 4 is welded to the welding boss 14.

[0042] like Figures 1-5 As shown, the cover is provided with a limiting protrusion 15 protruding into the mounting cavity 13. The limiting protrusion 15 is used to abut against the upper end surface of the bimetallic sheet 4 when the bimetallic sheet 4 is deformed by heat and thus drives the moving contact 11 to move to the position where it separates from the stationary contact 9.

[0043] like Figures 1-4 As shown, a first wiring pin is provided on one end of the cover body, and a second wiring pin is provided on one end of the base plate 2.

[0044] like Figures 1-4As shown, the first terminal has a first wire clamping terminal, and the first wire clamping terminal is provided with a first left clamping lug 16, a first right clamping lug 17 and a first wire clamping groove 18 for inserting the wire 28;

[0045] The first left pressure lug 16 is located on one side of the first wire pressing groove 18 and is used to bend and deform to press the wire 28 in the first wire pressing groove 18;

[0046] The first right pressure lug 17 is located on the other side of the first wire pressing groove 18 and is used to bend and deform to press the wire 28 in the first wire pressing groove 18;

[0047] The second terminal has a second crimping terminal, and the second crimping terminal has a second left crimping lug 19, a second right crimping lug 20 and a second crimping groove 21 for inserting the wire 28;

[0048] The second left pressure lug 19 is located on one side of the second wire pressing groove 21 and is used to bend and deform to press the wire 28 in the second wire pressing groove 21;

[0049] The second right pressure lug 20 is located on the other side of the second wire groove 21 and is used to bend and deform to press the wire 28 in the second wire groove 21.

[0050] like Figures 1-4 As shown, the first terminal also has a first connecting plate 22, one end of the first connecting plate 22 is connected to the cover, and the first pressure terminal is connected to the other end of the first connecting plate 22. The second terminal also has a second connecting plate 25, one end of the second connecting plate 25 is connected to the base plate 2, and the second pressure terminal is connected to the other end of the second connecting plate 25.

[0051] Example 2

[0052] like Figures 5-8 As shown, a thermal protector includes an upper cover 1, a base plate 2, insulating paper 3, and a bimetallic strip 4;

[0053] The insulating paper 3 includes a main body 5, a left folded edge 6, and a right folded edge 7. The main body 5 is attached to the upper end face of the base plate 2. The left folded edge 6 is connected to the left end of the main body 5 and folded over to be attached to the lower end face of the base plate 2. The right folded edge 7 is connected to the right end of the main body 5 and folded over to be attached to the lower end face of the base plate 2.

[0054] The upper cover 1 includes a cover body, a left bend, and a right bend. The cover body is located above the main body 5 of the insulating paper 3 and abuts against the upper surface of the main body 5. The left bend is connected to the left end of the cover body and bends to abut against the lower surface of the left folded edge 6. The right bend is connected to the right end of the cover body and bends to abut against the lower surface of the right folded edge 7.

[0055] The main body 5 of the insulating paper 3 is provided with a through hole 8, and the bottom plate 2 is provided with a stationary contact 9 that passes through the through hole 8;

[0056] The bimetallic strip 4 has a recessed curved portion 10. One end of the bimetallic strip 4 is connected to the cover body, and the other end of the bimetallic strip 4 is connected to a moving contact 11 located above the stationary contact 9 and used to abut against the stationary contact 9. Specifically, after the left curved portion abuts against the lower surface of the left folded edge portion 6, it can press the left folded edge portion 6, the left end of the base plate 2, and the main body portion 5 onto the cover body. After the right curved portion abuts against the lower surface of the right folded edge portion 7, it can press the right folded edge portion 7, the right end of the base plate 2, and the main body portion 5 onto the cover body. This allows the base plate 2 and the insulating paper 3 to be stably and reliably connected to the upper cover 1, improving the firmness of the connection between the upper cover 1 and the base plate 2, and thus improving the reliability and stability of the thermal protector in this embodiment. In this embodiment, the insulating paper 3 is used to insulate and separate the upper cover 1 and the base plate 2. At room temperature, the moving contact 11 on the bimetallic strip 4 maintains contact with the stationary contact 9. When the temperature rises to a set value, the bimetallic strip 4 deforms, causing the moving contact 11 to move away from the stationary contact 9. The recessed curved portion 10 on the bimetallic strip 4 allows it to better exhibit a curved structure, thus ensuring good contact between the moving contact 11 and the stationary contact 9 at room temperature. The lower end face of the base plate 2 is provided with multiple positioning holes 12.

[0057] like Figures 5-8 As shown, the cover has a mounting cavity 13 located above the main body 5 of the insulating paper 3. The upper end of the stationary contact 9 extends into the mounting cavity 13 after passing through the through hole 8. The bimetallic strip 4 and the moving contact 11 are both located in the mounting cavity 13.

[0058] The cover is provided with a welding boss 14 that protrudes into the mounting cavity 13, and one end of the bimetallic sheet 4 is welded to the welding boss 14.

[0059] The cover has a limiting protrusion 15 that protrudes into the mounting cavity 13. The limiting protrusion 15 is used to abut against the upper surface of the bimetallic sheet 4 when the bimetallic sheet 4 is deformed by heat and thus drives the moving contact 11 to move to the position where it separates from the stationary contact 9.

[0060] like Figures 6-8 As shown, a first wiring pin is provided on one end of the cover body, and a second wiring pin is provided on one end of the base plate 2.

[0061] like Figures 6-8 As shown, the first terminal has a first wire clamping terminal, and the first wire clamping terminal is provided with a first left clamping lug 16, a first right clamping lug 17 and a first wire clamping groove 18 for inserting the wire 28;

[0062] The first left pressure lug 16 is located on one side of the first wire pressing groove 18 and is used to bend and deform to press the wire 28 in the first wire pressing groove 18;

[0063] The first right pressure lug 17 is located on the other side of the first wire pressing groove 18 and is used to bend and deform to press the wire 28 in the first wire pressing groove 18;

[0064] The second terminal has a second crimping terminal, and the second crimping terminal has a second left crimping lug 19, a second right crimping lug 20 and a second crimping groove 21 for inserting the wire 28;

[0065] The second left pressure lug 19 is located on one side of the second wire pressing groove 21 and is used to bend and deform to press the wire 28 in the second wire pressing groove 21;

[0066] The second right pressure lug 20 is located on the other side of the second wire groove 21 and is used to bend and deform to press the wire 28 in the second wire groove 21.

[0067] like Figures 6-8 As shown, the first terminal block also has a first connecting plate 22, one end of the first connecting plate 22 is connected to the cover, and the first wire terminal is connected to the other end of the first connecting plate 22.

[0068] like Figures 6-8As shown, the opening of the first wire clamping groove 18 faces upward, and the first connecting plate 22 has an upwardly protruding first latch 23. A first groove 24 is provided between the first latch 23 and the first connecting plate 22, and the opening of the first groove 24 faces away from the first wire clamping terminal. Specifically, one of the wires 28 is used to be inserted into the first groove 24 and hooked onto the first latch 23 before being inserted into the first wire clamping groove 18. Then, the first left clamping lug 16 and the first right clamping lug 17 press the wire 28 in the first wire clamping groove 18, thereby improving the firmness of the connection between the wire 28 and the first terminal and preventing the wire 28 from becoming loose from the first terminal.

[0069] like Figures 6-8 As shown, the second terminal block also has a second connecting plate 25, one end of the second connecting plate 25 is connected to the base plate 2, and the second wire terminal is connected to the other end of the second connecting plate 25.

[0070] like Figures 6-8 As shown, the opening of the second wire clamping groove 21 faces upward, and the second connecting plate 25 is provided with an upwardly protruding second latch 26. A second groove 27 is provided between the second latch 26 and the second connecting plate 25, and the opening of the second groove 27 faces away from the second wire clamping terminal. Specifically, another wire 28 is used to be inserted into the second groove 27 and hooked onto the second latch 26, and then inserted into the second wire clamping groove 21. Then, the second left clamping ear 19 and the second right clamping ear 20 press the wire 28 in the second wire clamping groove 21, thereby improving the firmness of the connection between the wire 28 and the second terminal and preventing the wire 28 from becoming loose from the second terminal.

[0071] In summary, after the left bend abuts against the lower surface of the left folded edge 6, the left folded edge 6, the left end of the base plate 2, and the main body 5 can be pressed tightly onto the cover. After the right bend abuts against the lower surface of the right folded edge 7, the right folded edge 7, the right end of the base plate 2, and the main body 5 can be pressed tightly onto the cover. This allows the base plate 2 and the insulating paper 3 to be stably and reliably connected to the upper cover 1, improving the strength of the connection between the upper cover 1 and the base plate 2, and thus improving the reliability and stability of the thermal protector in this embodiment. The insulating paper 3 is used to insulate and separate the upper cover 1 and the bottom plate 2. At room temperature, the moving contact 11 on the bimetallic strip 4 maintains contact with the stationary contact 9. When the temperature rises to a set value, the bimetallic strip 4 deforms, thereby causing the moving contact 11 to move away from the stationary contact 9. The recessed bending portion 10 on the bimetallic strip 4 enables the bimetallic strip 4 to better present a bent structure, thereby enabling the moving contact 11 on the bimetallic strip 4 to maintain good contact with the stationary contact 9 at room temperature.

[0072] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thermal protector, characterized in that, It includes a top cover (1), a bottom plate (2), insulating paper (3), and a bimetallic strip (4); The insulating paper (3) includes a main body (5), a left folded edge (6) and a right folded edge (7). The main body (5) is attached to the upper end face of the base plate (2). The left folded edge (6) is connected to the left end of the main body (5) and folded to be attached to the lower end face of the base plate (2). The right folded edge (7) is connected to the right end of the main body (5) and folded to be attached to the lower end face of the base plate (2). The upper cover (1) includes a cover body, a left bend and a right bend. The cover body is located above the main body (5) of the insulating paper (3) and abuts against the upper surface of the main body (5). The left bend is connected to the left end of the cover body and bends to abut against the lower surface of the left folded edge (6). The right bend is connected to the right end of the cover body and bends to abut against the lower surface of the right folded edge (7). The main body (5) of the insulating paper (3) is provided with a through hole (8), and the bottom plate (2) is provided with a stationary contact (9) passing through the through hole (8); The bimetallic strip (4) has a recessed curved portion (10), one end of the bimetallic strip (4) is connected to the cover, and the other end of the bimetallic strip (4) is connected to a moving contact (11) located above the stationary contact (9) and used to abut against the stationary contact (9).

2. The thermal protector according to claim 1, characterized in that, The cover has a mounting cavity (13) located above the main body (5) of the insulating paper (3). The upper end of the stationary contact (9) extends into the mounting cavity (13) after passing through the through hole (8). The bimetallic strip (4) and the moving contact (11) are both located in the mounting cavity (13).

3. The thermal protector according to claim 2, characterized in that, The cover is provided with a welding boss (14) protruding into the mounting cavity (13), and one end of the bimetallic sheet (4) is welded to the welding boss (14).

4. The thermal protector according to claim 2, characterized in that, The cover is provided with a limiting protrusion (15) protruding into the mounting cavity (13). The limiting protrusion (15) is used to abut against the upper surface of the bimetallic sheet (4) when the bimetallic sheet (4) is deformed by heat and thus drives the moving contact (11) to move to the position separated from the stationary contact (9).

5. The thermal protector according to claim 1, characterized in that, The cover has a first wiring pin at one end, and the base plate (2) has a second wiring pin at one end.

6. The thermal protector according to claim 5, characterized in that, The first terminal has a first wire clamping terminal, and the first wire clamping terminal has a first left clamping lug (16), a first right clamping lug (17) and a first wire clamping groove (18) for inserting the wire (28); The first left pressure lug (16) is located on one side of the first wire groove (18) and is used to bend and deform to press the wire (28) in the first wire groove (18); The first right pressure lug (17) is located on the other side of the first wire groove (18) and is used to bend and deform to press the wire (28) in the first wire groove (18); The second terminal has a second crimping terminal, which has a second left crimping lug (19), a second right crimping lug (20) and a second crimping groove (21) for inserting the wire (28); The second left pressure lug (19) is located on one side of the second wire groove (21) and is used to bend and deform to press the wire (28) in the second wire groove (21); The second right pressure lug (20) is located on the other side of the second wire groove (21) and is used to bend and deform to press the wire (28) in the second wire groove (21).

7. The thermal protector according to claim 6, characterized in that, The first terminal block also has a first connecting plate (22), one end of the first connecting plate (22) is connected to the cover, and the first wire terminal is connected to the other end of the first connecting plate (22).

8. The thermal protector according to claim 7, characterized in that, The opening of the first wire pressing groove (18) is set upward, and the first connecting plate (22) is provided with a first latch (23) that protrudes upward. A first slot (24) is provided between the first latch (23) and the first connecting plate (22), and the opening of the first slot (24) is set away from the first wire pressing terminal.

9. The thermal protector according to claim 6, characterized in that, The second terminal also has a second connecting plate (25), one end of which is connected to the base plate (2), and the second wire terminal is connected to the other end of the second connecting plate (25).

10. The thermal protector according to claim 9, characterized in that, The opening of the second wire pressing groove (21) is set facing upward, and the second connecting plate (25) is provided with a second latch (26) that protrudes upward. A second slot (27) is provided between the second latch (26) and the second connecting plate (25), and the opening of the second slot (27) is set away from the second wire pressing terminal.

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