Self-resetting thermal protector

Abstract

The utility model discloses a kind of self-resetting thermal protector, including shell, insulating base, upper contact piece, lower contact piece and bimetallic strip;Wherein, the upper contact piece is connected on the upper end portion of the insulating base, the lower end portion of the insulating base is connected on the front end portion of the lower contact piece, the rear end portion of the lower contact piece is connected on the rear end portion of the bimetallic strip, the front end portion of the bimetallic strip is connected with the contact for abutting contact with the upper contact piece, the insulating base, the upper contact piece, the lower contact piece and the bimetallic strip are all installed in the shell, the upper contact piece and the lower contact piece are respectively provided with wiring portion that protrudes to the shell outside.The utility model can avoid the corrosion of parts, and then can prolong service life.

Description

Technical Field

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

[0002] Currently, thermal protectors are devices with overheat and overload protection functions, widely used in home appliances, industrial motors, new energy batteries, and other fields. Thermal protectors trigger power cut-off by deforming a bimetallic strip as the temperature rises. Chinese patent CN212062299U discloses a bimetallic strip thermal protector; however, this protector has an exposed structure, with the upper and lower contacts and the bimetallic strip all exposed. In humid and corrosive environments, this can lead to corrosion of the components, thus affecting the lifespan of the thermal protector. 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 self-resetting thermal protector that can prevent the corrosion of parts and thus extend its service life.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a self-resetting thermal protector, including a shell, an insulating base, an upper contact plate, a lower contact plate, and a bimetallic strip;

[0005] The upper contact piece is connected to the upper end of the insulating base;

[0006] The front end of the lower contact piece is connected to the lower end of the insulating base;

[0007] The rear end of the bimetallic strip is connected to the rear end of the lower contact piece, and the front end of the bimetallic strip is connected to a contact for abutting against the upper contact piece.

[0008] The insulating base, the upper contact piece, the lower contact piece, and the bimetallic strip are all installed in the housing;

[0009] The upper contact and the lower contact are respectively provided with wiring portions that extend out of the outer casing.

[0010] Furthermore, the outer casing is made of insulating material.

[0011] Furthermore, the upper contact piece is attached to the upper end surface of the insulating base, one end of the upper contact piece is connected to a first bent lug, and the other end of the upper contact piece is connected to a second bent lug. The first bent lug and the second bent lug are respectively bent to abut against the lower end surface of the insulating base, thereby fixing the upper contact piece to the upper end surface of the insulating base.

[0012] The lower contact piece is attached to the lower end surface of the insulating base. One end of the lower contact piece is connected to a third bent lug, and the other end of the lower contact piece is connected to a fourth bent lug. The third bent lug and the fourth bent lug are respectively bent to abut against the upper end surface of the insulating base, thereby fixing the lower contact piece to the lower end surface of the insulating base.

[0013] Furthermore, the lower contact piece is provided with a first clearance groove for avoiding the first bent ear and a second clearance groove for avoiding the second bent ear;

[0014] The upper contact piece is provided with a third clearance groove for avoiding the third bent ear and a fourth clearance groove for avoiding the fourth bent ear.

[0015] Furthermore, the side of the insulating base is provided with a first slot for the first bent ear clip, a second slot for the second bent ear clip, a third slot for the third bent ear clip, and a fourth slot for the fourth bent ear clip.

[0016] Furthermore, the lower contact piece includes a body portion, an inclined transition portion, and a mounting connection portion;

[0017] One end of the inclined transition portion is connected to the rear end of the main body, the mounting connection portion is connected to the other end of the inclined transition portion, and the rear end of the bimetallic strip is connected to the mounting connection portion.

[0018] Furthermore, the rear end of the bimetallic strip is riveted to the mounting connection, and the contact is riveted to the front end of the bimetallic strip.

[0019] Furthermore, the outer casing includes a body and a cover plate;

[0020] The housing has an inner cavity with an opening facing forward, and the insulating base, the upper contact piece, the lower contact piece, and the bimetallic strip are all installed in the inner cavity;

[0021] The cover plate is installed in the front end of the inner cavity and seals the opening of the inner cavity. The wiring portions on the upper contact plate and the wiring portions on the lower contact plate extend outward after passing through the cover plate.

[0022] Furthermore, the rear end of the inner cavity is provided with a positioning slot, and the rear end of the lower contact piece is engaged in the positioning slot.

[0023] Furthermore, the shell body is provided with a limiting protrusion that protrudes into the inner cavity and is located above the bimetallic sheet.

[0024] After adopting the above technical solution, the wiring part is used to connect with the wire. In the initial state, the contact abuts against the upper contact piece, and the current can flow sequentially through the upper contact piece, the contact, the bimetallic strip, and the lower contact piece. When a current overload occurs, the current exceeds the rated current that the thermal protector can withstand. Because the increase in current leads to an increase in heat generation, the temperature rises. At this time, the bimetallic strip will deform due to the temperature rise, which will drive the contact to move away from the upper contact piece, thereby breaking the circuit. After the circuit is broken, no more heat is generated. After the temperature of the thermal protector naturally decreases, the bimetallic strip will deform back to its initial state so that the contact and the upper contact piece can abut against each other again. In this embodiment, by installing the insulating base, upper contact piece, lower contact piece, and bimetallic strip all in the housing, the humid and corrosive environment can be isolated by the housing, thereby avoiding the corrosion of the components and greatly extending the service life. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the self-resetting thermal protector of this utility model when the contact is in contact with the upper contact piece;

[0026] Figure 2 This is a cross-sectional view of the self-resetting thermal protector of this utility model when the contact is disengaged from the upper contact piece.

[0027] Figure 3 This is a schematic diagram of the structure of the insulating base, upper contact, lower contact, and bimetallic strip of this utility model. Figure 1 ;

[0028] Figure 4 This is a schematic diagram of the structure of the insulating base, upper contact, lower contact, and bimetallic strip of this utility model. Figure 2 ;

[0029] Figure 5 This is an exploded view of the assembly of the insulating base, upper contact piece, lower contact piece, and bimetallic strip of this utility model.

[0030] In the diagram: 1. Outer shell; 2. Insulating base; 3. Upper contact piece; 4. Lower contact piece; 5. Bimetallic strip; 6. Contact; 7. Wiring part; 8. First bent lug; 9. Second bent lug; 10. Third bent lug; 11. Fourth bent lug; 12. First clearance groove; 13. Second clearance groove; 14. Third clearance groove; 15. Fourth clearance groove; 16. First slot; 17. Second slot; 18. Third slot; 19. Fourth slot; 20. Body part; 21. Inclined transition part; 22. Mounting connection part; 23. Shell body; 24. Cover plate; 25. Inner cavity; 26. Positioning slot; 27. Limiting protrusion. Detailed Implementation

[0031] 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.

[0032] like Figures 1-5 As shown, a self-resetting thermal protector includes a housing 1, an insulating base 2, an upper contact 3, a lower contact 4, and a bimetallic strip 5.

[0033] The upper contact piece 3 is connected to the upper end of the insulating base 2;

[0034] The front end of the lower contact piece 4 is connected to the lower end of the insulating base 2;

[0035] The rear end of the bimetallic strip 5 is connected to the rear end of the lower contact piece 4, and the front end of the bimetallic strip 5 is connected to a contact 6 for abutting against the upper contact piece 3.

[0036] The insulating base 2, the upper contact piece 3, the lower contact piece 4, and the bimetallic strip 5 are all installed in the outer casing 1;

[0037] The upper contact plate 3 and the lower contact plate 4 are respectively provided with wiring portions 7 extending out of the outer casing 1.

[0038] Specifically, the wiring part 7 is used to connect to the wire. In the initial state, the contact 6 abuts against the upper contact 3, and the current can flow sequentially through the upper contact 3, the contact 6, the bimetallic strip 5, and the lower contact 4. When an overload occurs, the current exceeds the rated current that the thermal protector can withstand. Because the increase in current leads to an increase in heat generation, the temperature rises. At this time, the bimetallic strip 5 will deform due to the temperature rise, which will cause the contact 6 to move away from the upper contact 3, thus breaking the circuit. After the circuit is broken, no more heat is generated. After the temperature of the thermal protector naturally decreases, the bimetallic strip 5 will deform back to its initial state so that the contact 6 and the upper contact 3 can re-abut against each other. In this embodiment, by installing the insulating base 2, the upper contact 3, the lower contact 4, and the bimetallic strip 5 all in the housing 1, the housing 1 can isolate the humid and corrosive environment, thereby preventing the components from rusting and greatly extending their service life.

[0039] In this embodiment, the outer shell 1 may be made of insulating material.

[0040] like Figures 3-5As shown, the upper contact piece 3 is attached to the upper surface of the insulating base 2. One end of the upper contact piece 3 is connected to a first bent lug 8, and the other end of the upper contact piece 3 is connected to a second bent lug 9. The first bent lug 8 and the second bent lug 9 are bent to abut against the lower surface of the insulating base 2, thereby fixing the upper contact piece 3 to the upper surface of the insulating base 2. The lower contact piece 4 is attached to the lower surface of the insulating base 2. One end of the lower contact piece 4 is connected to a third bent lug 10, and the other end of the lower contact piece 4 is connected to a fourth bent lug 11. The third bent lug 10 and the fourth bent lug 11 are bent to abut against the upper surface of the insulating base 2, thereby fixing the lower contact piece 4 to the lower surface of the insulating base 2.

[0041] like Figures 3-5 As shown, the lower contact piece 4 is provided with a first clearance groove 12 for avoiding the first bent lug 8 and a second clearance groove 13 for avoiding the second bent lug 9; the upper contact piece 3 is provided with a third clearance groove 14 for avoiding the third bent lug 10 and a fourth clearance groove 15 for avoiding the fourth bent lug 11. Specifically, the first clearance groove 12 prevents the first bent lug 8 from contacting the lower contact piece 4, the second clearance groove 13 prevents the second bent lug 9 from contacting the lower contact piece 4, the third clearance groove 14 prevents the third bent lug 10 from contacting the upper contact piece 3, and the fourth clearance groove 15 prevents the fourth bent lug 11 from contacting the upper contact piece 3, thereby ensuring that the upper contact piece 3 and the lower contact piece 4 do not contact each other.

[0042] like Figures 3-5 As shown, the side of the insulating base 2 is provided with a first slot 16 that engages with the first bent lug 8, a second slot 17 that engages with the second bent lug 9, a third slot 18 that engages with the third bent lug 10, and a fourth slot 19 that engages with the fourth bent lug 11. Specifically, the engagement of the first bent lug 8 in the first slot 16 and the engagement of the second bent lug 9 in the second slot 17 can limit the front-to-back position of the upper contact piece 3 on the insulating base 2, and the engagement of the third bent lug 10 in the third slot 18 and the engagement of the fourth bent lug 11 in the fourth slot 19 can limit the front-to-back position of the lower contact piece 4 on the insulating base 2.

[0043] like Figures 1-5 As shown, the lower contact piece 4 may include a body portion 20, an inclined transition portion 21, and a mounting connection portion 22;

[0044] One end of the inclined transition portion 21 is connected to the rear end of the main body portion 20, and the mounting connection portion 22 is connected to the other end of the inclined transition portion 21. The rear end of the bimetallic strip 5 is connected to the mounting connection portion 22. In this embodiment, the third bent ear 10 and the fourth bent ear 11 are both connected to the main body portion 20. The wiring portion 7 is provided on the front end of the main body portion 20 and the front end of the upper contact piece 3, respectively.

[0045] Specifically, the rear end of the bimetallic strip 5 is riveted to the mounting connection part 22, and the contact 6 is riveted to the front end of the bimetallic strip 5.

[0046] like Figure 1 , 2 As shown, the outer casing 1 may include a casing body 23 and a cover plate 24;

[0047] The housing 23 has an inner cavity 25 with its opening facing forward. The insulating base 2, the upper contact piece 3, the lower contact piece 4, and the bimetallic strip 5 are all installed in the inner cavity 25.

[0048] The cover plate 24 is installed in the front end of the inner cavity 25 and seals the opening of the inner cavity 25. The wiring portion 7 on the upper contact piece 3 and the wiring portion 7 on the lower contact piece 4 pass through the cover plate 24 and extend outward. Specifically, after the cover plate 24 is installed in place, epoxy resin can be used to seal and fix the opening of the inner cavity 25 and the cover plate 24.

[0049] like Figure 1 , 2 As shown, the rear end of the inner cavity 25 is provided with a positioning slot 26, and the rear end of the lower contact piece 4 is engaged in the positioning slot 26; specifically, the rear end of the mounting connection part 22 in the lower contact piece 4 is engaged in the positioning slot 26.

[0050] like Figure 1 , 2 As shown, the housing 23 is provided with a limiting protrusion 27 that protrudes into the inner cavity 25 and is located above the bimetallic strip 5; specifically, when the bimetallic strip 5 is deformed by heat and thus drives the contact 6 to move to separate from the upper contact piece 3, the limiting protrusion 27 will abut against the upper end surface of the bimetallic strip 5 to limit it.

[0051] In summary, the wiring part 7 is used to connect to the wire. In the initial state, the contact 6 abuts against the upper contact 3, and the current can flow sequentially through the upper contact 3, the contact 6, the bimetallic strip 5, and the lower contact 4. When an overload occurs, the current exceeds the rated current that the thermal protector can withstand. Because the increase in current leads to an increase in heat generation, the temperature rises. At this time, the bimetallic strip 5 will deform due to the temperature rise, which will cause the contact 6 to move away from the upper contact 3, thus breaking the circuit. After the circuit is broken, no more heat is generated. After the temperature of the thermal protector naturally decreases, the bimetallic strip 5 will deform back to its initial state so that the contact 6 and the upper contact 3 can re-abut against each other. In this embodiment, by installing the insulating base 2, the upper contact 3, the lower contact 4, and the bimetallic strip 5 all in the housing 1, the housing 1 can isolate the humid and corrosive environment, thereby preventing the components from rusting and greatly extending their service life.

[0052] 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 self-resetting thermal protector, characterized in that, It includes a housing (1), an insulating base (2), an upper contact plate (3), a lower contact plate (4), and a bimetallic strip (5); The upper contact piece (3) is connected to the upper end of the insulating base (2); The front end of the lower contact piece (4) is connected to the lower end of the insulating base (2); The rear end of the bimetallic strip (5) is connected to the rear end of the lower contact piece (4), and the front end of the bimetallic strip (5) is connected to a contact (6) for abutting against the upper contact piece (3). The insulating base (2), the upper contact plate (3), the lower contact plate (4) and the bimetallic strip (5) are all installed in the outer casing (1); The upper contact (3) and the lower contact (4) are respectively provided with wiring portions (7) extending out of the outer casing (1).

2. The self-resetting thermal protector according to claim 1, characterized in that, The outer shell (1) is made of insulating material.

3. The self-resetting thermal protector according to claim 1, characterized in that, The upper contact piece (3) is attached to the upper surface of the insulating base (2). One end of the upper contact piece (3) is connected to a first bent ear (8), and the other end of the upper contact piece (3) is connected to a second bent ear (9). The first bent ear (8) and the second bent ear (9) are bent to abut against the lower surface of the insulating base (2) to fix the upper contact piece (3) on the upper surface of the insulating base (2). The lower contact piece (4) is attached to the lower end surface of the insulating base (2). One end of the lower contact piece (4) is connected to a third bent lug (10), and the other end of the lower contact piece (4) is connected to a fourth bent lug (11). The third bent lug (10) and the fourth bent lug (11) are bent to abut against the upper end surface of the insulating base (2), thereby fixing the lower contact piece (4) to the lower end surface of the insulating base (2).

4. The self-resetting thermal protector according to claim 3, characterized in that, The lower contact piece (4) is provided with a first clearance groove (12) for avoiding the first bending ear (8) and a second clearance groove (13) for avoiding the second bending ear (9); The upper contact piece (3) is provided with a third clearance groove (14) for avoiding the third bending ear (10) and a fourth clearance groove (15) for avoiding the fourth bending ear (11).

5. The self-resetting thermal protector according to claim 3, characterized in that, The insulating base (2) has a first slot (16) that engages with the first bending ear (8), a second slot (17) that engages with the second bending ear (9), a third slot (18) that engages with the third bending ear (10), and a fourth slot (19) that engages with the fourth bending ear (11) on its side.

6. The self-resetting thermal protector according to claim 1, characterized in that, The lower contact piece (4) includes a body part (20), an inclined transition part (21), and a mounting connection part (22); One end of the inclined transition portion (21) is connected to the rear end of the main body portion (20), the mounting connection portion (22) is connected to the other end of the inclined transition portion (21), and the rear end of the bimetallic strip (5) is connected to the mounting connection portion (22).

7. The self-resetting thermal protector according to claim 6, characterized in that, The rear end of the bimetallic strip (5) is riveted to the mounting connection (22), and the contact (6) is riveted to the front end of the bimetallic strip (5).

8. The self-resetting thermal protector according to claim 1, characterized in that, The outer casing (1) includes a body (23) and a cover plate (24); The shell (23) has an inner cavity (25) with the opening facing forward. The insulating base (2), the upper contact piece (3), the lower contact piece (4) and the bimetallic piece (5) are all installed in the inner cavity (25). The cover plate (24) is installed in the front end of the inner cavity (25) and seals the opening of the inner cavity (25). The wiring portion (7) on the upper contact piece (3) and the wiring portion (7) on the lower contact piece (4) extend outward after passing through the cover plate (24).

9. The self-resetting thermal protector according to claim 8, characterized in that, The rear end of the inner cavity (25) is provided with a positioning slot (26), and the rear end of the lower contact piece (4) is engaged in the positioning slot (26).

10. The self-resetting thermal protector according to claim 8, characterized in that, The shell (23) is provided with a limiting protrusion (27) that protrudes into the inner cavity (25) and is located above the bimetallic sheet (5).

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