Novel power-off reset type overheat protector

Abstract

The utility model relates to the technical field of electrical engineering, and discloses a novel power-off reset type overheat protector, which comprises a lower cover structural member and an upper cover structural member, and the lower cover structural member and the upper cover structural member form a shell of the overheat protector to provide mechanical protection and structural support. The wiring terminal is used for realizing the connection between the overheat protector and an external circuit, the terminal rivet is used for fixing the wiring terminal and ensuring the stability of electrical connection, and the movable conductive reed and the movable contact work together and are used for disconnecting the circuit when the temperature rises. According to the novel power-off reset type overheat protector, the structure of the movable conductive reed and the static conductive sheet is adopted, the design enables current to be rapidly disconnected from the movable contact and the static contact when the current is overloaded or overheated, the disconnection speed is high, the response is quick, the safety of a circuit is ensured, meanwhile, the design of the movable conductive reed also supports the reliability of repeated use, and the service life of the protector is prolonged. And the durability of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering, and particularly to a novel power-off reset type overheat protector. Background Technique

[0002] The power-off reset type overheat protector is a key safety component used in various electrical devices to prevent equipment damage or fire caused by overheating. This protector can automatically detect the temperature inside the equipment and quickly cut off the power supply when the temperature exceeds the safety threshold, avoiding potential dangers and damages. At the same time, this protector also has an automatic reset function, that is, after the temperature drops back to the safe range, it can automatically restore the power connection without manual intervention. This feature greatly increases the convenience and safety of equipment use.

[0003] Traditional thermal protectors usually consist of bimetallic strips, and their working principle is based on the deformation of bimetallic strips when heated, thereby triggering power-off protection. However, these traditional devices have some defects, such as slow response speed, decreased reliability after repeated use, and the need for manual intervention for reset because they cannot be automatically reset after the temperature recovers. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] The purpose of the utility model is to provide a novel power-off reset type overheat protector to solve the problems of slow response speed and decreased reliability after repeated use of traditional thermal protectors mentioned in the above background technique.

[0006] (2) Technical Solutions

[0007] To achieve the above purpose, the utility model provides the following technical solutions: A novel power-off reset type overheat protector, which includes a lower cover structural member and an upper cover structural member. The lower cover structural member and the upper cover structural member are connected by upper and lower cover rivets. A terminal is installed inside the upper cover structural member and fixed by terminal rivets. A moving conductive reed is provided at the lower end of the lower cover structural member, and a static conductive sheet is provided below the moving conductive reed. The lower cover structural member and the upper cover structural member together form the outer shell of the overheat protector, providing mechanical protection and structural support. The terminal is used to connect the overheat protector to the external circuit, and the terminal rivet is used to fix the terminal to ensure the stability of the electrical connection. The moving conductive reed works together with the moving contact to disconnect the circuit when the temperature rises.

[0008] Preferably, a moving contact is welded to the lower end of the moving conductive reed, and a static contact is welded to the conductive sheet to form a static conductive component. The static contact and the static conductive sheet together form a static circuit connection point to keep the circuit closed under normal circumstances.

[0009] Preferably, a PTC heating sheet is arranged between the moving conductive reed and the static conductive sheet. Both sides of the PTC heating sheet are respectively docked with the contacts of the moving conductive reed and the static conductive sheet. The PTC heating sheet generates heat when detecting an excessive temperature, blocks the current and drives the protection action.

[0010] Preferably, a PTC / PI insulating film is arranged between the PTC heating sheet and the bimetallic temperature sheet. A circular PI insulating film is arranged on the lower side of the PTC / PI insulating film. The bimetallic temperature sheet is arranged on the lower side of the circular PI insulating film. The PTC / PI insulating film is used to isolate the PTC heating sheet and the bimetallic temperature sheet, prevent electrical short circuit and overheat damage. The action push rod directly acts on the bimetallic temperature sheet to transmit the physical deformation caused by heat, thereby disconnecting the circuit.

[0011] Preferably, one end of the bimetallic temperature sheet contacts with an action push rod. The other end of the action push rod is connected to the moving conductive reed through the circular PI insulating film. The circular PI insulating film provides additional insulation protection to avoid electrical faults. The bimetallic temperature sheet senses the change of the ambient temperature and directly triggers the power-off or reset action.

[0012] Preferably, after the bimetallic temperature sheet is heated, the action push rod is pushed to move the moving conductive reed, thereby disconnecting the circuit connection between the moving contact and the static contact.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The novel power-off and reset type overheat protector adopts the structure of a moving conductive reed and a static conductive sheet. This design enables the current to quickly disconnect between the moving contact and the static contact during overload or overheat. The disconnection speed is fast and the response is sensitive, ensuring the safety of the circuit. At the same time, the design of the moving conductive reed also supports the reliability of repeated use and improves the durability of the product;

[0015] 2. The novel power-off and reset type overheat protector, the PTC / PI insulating film and the circular PI insulating film arranged between the PTC heating sheet and the bimetallic temperature sheet enhance the overall insulation performance, ensuring the safe operation of the overheat protector at high temperatures. This insulation structure not only prevents current leakage, but also avoids damage caused by high temperatures and protects the internal components;

[0016] 3. The novel power-off and reset type overheat protector, the design of the action push rod enables the bimetallic temperature sheet to directly drive the conductive sheet to perform the disconnection action when sensing an overheat situation. The directness of this mechanical action provides extremely high reliability and precise control. Compared with the traditional overheat protector, this structure simplifies the internal mechanical complexity, reduces potential fault points, and enhances the stability and long-term reliability of the entire system. Description of the Drawings

[0017] Figure 1 Explosion diagram of the power-off reset type overheat protector of the present utility model;

[0018] Figure 2 Top view of the cross-section of the power-off reset type overheat protector of the present utility model;

[0019] Figure 3 Schematic diagram of the cross-sectional structure of the power-off reset type overheat protector of the present utility model;

[0020] Figure 4 For the present utility model Figure 3 Enlarged view of A in the figure.

[0021] In the figure: 1. Lower cover structural member; 2. Wiring terminal; 3. Moving conductive reed; 4. Moving contact; 5. Static contact; 6. Static conductive sheet; 7. PTC heating sheet; 8. PTC / PI insulating film; 9. Actuating ejector rod; 10. Circular PI insulating film; 11. Bimetallic temperature sheet; 12. Upper cover structural member; 13. Upper and lower cover rivets; 14. Terminal rivets. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1 - 4, the present utility model provides a technical solution: a new type of power-off reset overheat protector. This new type of power-off reset overheat protector includes a lower cover structural member 1 and an upper cover structural member 12. The lower cover structural member 1 and the upper cover structural member 12 are connected by an upper and lower cover rivet 13. A wiring terminal 2 is installed inside the upper cover structural member 12 and is fixed by a terminal rivet 14. A moving conductive reed 3 is provided at the lower end of the lower cover structural member 1. A static conductive sheet 6 is provided on the lower side of the moving conductive reed 3. The lower cover structural member 1 provides basic support and mechanical protection for the entire power-off reset overheat protector. The upper cover structural member 12 cooperates with the lower cover structural member 1 to enclose the internal components and ensure its dust and water protection. The wiring terminal 2 provides an interface for electrical connection, facilitating the connection between the overheat protector and the external circuit. The terminal rivet 14 is used to fix the wiring terminal 2 to ensure the stability and reliability of its connection. The moving conductive reed 3 provides necessary elastic support when the overheat protector operates, allowing the moving contact 4 to move quickly, thereby disconnecting the circuit. The moving contact 4 directly participates in disconnecting or closing the circuit and is a key component for realizing the protection function. The static contact 5 cooperates with the moving contact 4 to form a contact pair that can be quickly broken. The static conductive sheet 6 provides stable support for the static contact 5 to ensure the closure of the circuit under normal conditions.

[0024] A moving contact 4 is welded to the lower end of the moving conductive reed 3, and a static contact 5 is welded to the conductive sheet 6 to form a static conductive assembly. A PTC heating element 7 is provided between the moving conductive reed 3 and the static conductive sheet 6. The two sides of the PTC heating element 7 are respectively butted against the contacts of the moving conductive reed 3 and the static conductive sheet 6. A PTC / PI insulating film 8 is provided between the PTC heating element 7 and the bimetallic temperature sheet 11. A circular PI insulating film 10 is provided on the lower side of the PTC / PI insulating film 8, and a bimetallic temperature sheet 11 is provided on the lower side of the circular PI insulating film 10. The PTC heating element 7 heats up when detecting too high a temperature and limits the current through the change of its own resistance value to protect the circuit from further damage. The PTC / PI insulating film 8 is used to isolate the PTC heating element 7 and the bimetallic temperature sheet 11 to prevent direct heat transfer. The action push rod 9, as a transmission element that responds to overheat deformation, converts the deformation of the bimetallic temperature sheet 11 into an action force, resulting in the disconnection of the circuit. The circular PI insulating film 10 provides an additional insulating layer between the action push rod 9 and the bimetallic temperature sheet 11 to prevent electrical faults.

[0025] One end of the bimetallic temperature piece 11 is in contact with the actuating push rod 9. The other end of the actuating push rod 9 is connected to the moving conductive reed 3 through a circular PI insulating film 10. After the bimetallic temperature piece 11 is heated, it causes the actuating push rod 9 to push the moving conductive reed 3 to move, thereby disconnecting the circuit connection between the moving contact 4 and the static contact 5. The bimetallic temperature piece 11 is a key component for sensing the ambient temperature. Its deformation directly drives the actuating push rod 9 to complete the protection action. The upper and lower cover rivets 13 are responsible for fixing the upper cover structural member 12 and the lower cover structural member 1 to ensure the structural integrity and sealing of the entire device.

[0026] Working principle: In this new type of power-off reset overheat protector, the lower cover structural member 1 and the upper cover structural member 12 are tightly connected by the upper and lower cover rivets 13 to ensure the structural stability of the entire device. The wiring terminal 2 inside the upper cover structural member 12 is fixed by the terminal rivet 14 to provide the reliability of electrical connection. The lower end of the lower cover structural member 1 is equipped with a moving conductive reed 3. This reed is designed considering the needs of electrical conduction and action response. The lower side of the moving conductive reed 3 cooperates with the static conductive sheet 6, and the static contact 5 is welded on it to form a static conductive component. This configuration enhances the electrical safety and stability of the product. A PTC heating sheet 7 is embedded between the moving conductive reed 3 and the static conductive sheet 6. The two sides of the PTC heating sheet 7 are respectively docked with the contacts of the moving conductive reed 3 and the static conductive sheet 6 to ensure a rapid response when the temperature is too high. A PTC / PI insulating film 8 is placed between the PTC heating sheet 7 and the bimetallic temperature piece 11 to isolate the direct influence of heat on the bimetallic sheet and prevent misoperation. The circular PI insulating film 10 is located below the PTC / PI insulating film 8 and is adjacent to the bimetallic temperature piece 11 to provide additional insulation protection for the bimetallic sheet. One end of the bimetallic temperature piece 11 is in contact with the actuating push rod 9, and this push rod is connected to the moving conductive reed 3. When the bimetallic temperature piece 11 deforms due to temperature rise, it pushes the moving conductive reed 3 to move through the actuating push rod 9, thereby disconnecting the circuit connection between the moving contact 4 and the static contact 5 to achieve the overheat protection function. This design not only provides rapid-response protection but also ensures safe power-off and reset functions after overheating.

[0027] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A novel power-off reset type overheat protector, the novel power-off reset type overheat protector comprising a lower cover structure (1) and an upper cover structure (12), characterized in that: The lower cover structure (1) is connected to the upper cover structure (12) via upper and lower cover rivets (13); a connection terminal (2) is installed in the upper cover structure (12); the connection terminal (2) is fixed via a terminal rivet (14); a dynamic conductive spring sheet (3) is arranged at the lower end of the lower cover structure (1); and a static conductive sheet (6) is arranged on the lower side of the dynamic conductive spring sheet (3).

2. A novel power-off reset type overheat protector according to claim 1, characterized in that: A moving contact (4) is welded to the lower end of the moving conductive spring sheet (3), and a static contact (5) is welded to the conductive sheet (6), thereby forming a static conductive assembly.

3. A novel power-off reset type overheat protector according to claim 2, characterized in that: A PTC heating sheet (7) is provided between the dynamic conductive spring sheet (3) and the static conductive sheet (6), and two sides of the PTC heating sheet (7) are respectively connected to the contact points of the dynamic conductive spring sheet (3) and the static conductive sheet (6).

4. A novel power-off reset type overheat protector according to claim 3, characterized in that: A PTC / PI insulating film (8) is arranged between the PTC heating sheet (7) and the bimetallic temperature sheet (11), a circular PI insulating film (10) is arranged on the lower side of the PTC / PI insulating film (8), and a bimetallic temperature sheet (11) is arranged on the lower side of the circular PI insulating film (10).

5. A novel power-off reset type overheat protector according to claim 4, characterized in that: One end of the bimetallic temperature piece (11) contacts an actuating top rod (9), and the other end of the actuating top rod (9) is connected to a dynamic conductive spring sheet (3) via a circular PI insulating film (10).

6. A novel power-off reset type overheat protector according to claim 4, characterized in that: When the bimetallic temperature piece (11) is heated, the actuating push rod (9) pushes the moving conductive spring piece (3) to move, thereby disconnecting the circuit connection between the moving contact (4) and the stationary contact (5).

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