Organic matter type temperature fuse

Abstract

The utility model provides an organic matter type thermal fuse, and relates to the technical field of electronic devices. Comprising a shell, a movable electrode, an organic matter temperature sensing body and a metal shell are arranged in the shell, the metal shell is arranged in the shell, and the movable electrode and the organic matter temperature sensing body are installed in the metal shell; the movable electrode is conductively connected with the metal shell through a conductive piece, one end of the movable electrode is suitable for extending out of one end of the metal shell to be movably connected with a first lead, the other end of the metal shell is connected with a second lead, and a first elastic piece is arranged between the movable electrode and the organic matter temperature sensing body. According to the scheme of the utility model, the high voltage resistance and large current resistance of the organic matter type thermal fuse are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, in particular to an organic type temperature fuse. Background Art

[0002] A thermal fuse, also called a thermal fuse, is an irreversible over-temperature protection device. As a terminal protection component for electrical appliances, it is mainly used for overheating protection in small household appliances such as electric irons, thermoelectric hair dryers, electric stoves, rice cookers, electric kettles, coffee pots, and sandwich ovens. It generally works at a specified temperature, and senses the external temperature through the internal organic temperature sensor. When the external temperature reaches the change in the state of the organic temperature sensor, the thermal fuse will fuse through its own internal structure, thereby cutting off the series circuit to achieve protection.

[0003] The rated voltage of existing organic thermal fuses is mostly 250Vac and below, and the rated voltage is mostly 20A and below. Due to the limitations of size and structure, it is impossible to achieve the electrical clearance and creepage distance required for higher voltages. When the organic thermal fuse is used for large currents, the arc will weld the contacts and star-shaped springs together at the moment of disconnecting the circuit, and even burn the circuit-breaking spring, making the over-temperature fuse protection function ineffective. Utility Model Content

[0004] The utility model discloses an organic thermal fuse, which aims to improve the problem that when the existing temperature-sensitive organic fuse disconnects the circuit at high voltage or high current, the electric arc will weld the contact and the star-shaped spring together, and even burn the circuit-breaking spring, making the over-temperature fusing protection function of the thermal fuse ineffective.

[0005] The utility model adopts the following scheme:

[0006] The present application provides an organic type temperature fuse, comprising a shell, a movable electrode is arranged in the shell, and also comprises: an organic temperature sensor and a metal shell, wherein the metal shell is arranged in the shell, and the movable electrode and the organic temperature sensor are installed inside the metal shell; the movable electrode is conductively connected to the metal shell through a conductive member, and one end of the movable electrode is suitable for extending out of one end of the metal shell to be movably connected to a first lead, and the other end of the metal shell is connected to a second lead, a first elastic member is arranged between the movable electrode and the organic temperature sensor, and the first elastic member is suitable for driving the movable electrode to move toward the direction of the organic temperature sensor when the organic temperature sensor melts so as to disconnect the movable electrode from the first lead.

[0007] Furthermore, an insulator is fixed inside one end of the metal shell located at the movable electrode, an active cavity suitable for the movable electrode to move is formed inside the insulator, and the first elastic member is pressed tightly against the insulator.

[0008] Furthermore, one end of the insulator is exposed from the metal shell, and the movable electrode is suitable for being retracted into the movable cavity under the push of the first elastic member after the organic temperature sensing body is melted.

[0009] Furthermore, the conductive member is arranged at an end of the movable electrode away from the first lead, and the conductive member is a star-shaped spring.

[0010] Furthermore, a second elastic member is provided between the star-shaped reed and the organic temperature sensor, and two sides of the second elastic member are respectively connected to the star-shaped reed and the organic temperature sensor through supporting copper sheets.

[0011] Furthermore, the star-shaped reed is made of any one of copper, silver, silver-copper alloy, copper plated with silver, copper plated with nickel silver, and copper plated with gold.

[0012] Furthermore, a third elastic member is disposed inside the metal shell and one end of the outer shell to provide pressure for the movable electrode to press against the first lead.

[0013] Furthermore, the contact point between the movable electrode and the first lead is located outside the metal shell and inside the outer shell.

[0014] Furthermore, contact layers are respectively provided at contact points between the movable electrode and the first lead.

[0015] Furthermore, the contact layer uses a metal element or a metal combination as a matrix, and a precious metal coating is electroplated on the surface; or the contact layer is any one of silver, silver-copper-nickel, silver-nickel, silver-tin oxide, silver-tin oxide-indium oxide, silver-zinc oxide, and silver-copper-nickel oxide, or a combination of any one of silver, silver-copper-nickel, silver-nickel, silver-tin oxide, silver-tin oxide-indium oxide, silver-zinc oxide, and silver-copper-nickel oxide.

[0016] Beneficial effects:

[0017] The utility model places the circuit cut-off position outside the metal shell and inside the outer shell, so that when the work is disconnected, there is a larger electrical gap and creepage distance, and the internal space is not limited during disconnection, so the influence of the arc on the circuit breaker spring and the star-shaped spring leaf is isolated, the performance reliability of the breaking current is improved, and the safety performance is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an organic type temperature fuse of the utility model;

[0019] Figure 2 This is another structural schematic diagram of an organic type temperature fuse of the utility model.

[0020] Figure numerals: first lead 1, sealing resin 2, movable electrode 3, insulator 4, first elastic member 5, star-shaped spring 6, second elastic member 7, supporting copper sheet 8, organic temperature sensor 9, metal shell 10, third elastic member 11, shell 12, second lead 13. DETAILED DESCRIPTION

[0021] Example 1

[0022] Combination Figure 1 The present embodiment provides an organic type temperature fuse, comprising a shell 12, wherein a movable electrode 3 is arranged in the shell 12, and further comprising: an organic temperature sensor 9 and a metal shell 10, wherein the metal shell 10 is arranged in the shell 12, and the movable electrode 3 and the organic temperature sensor 9 are installed inside the metal shell 10; the movable electrode 3 is conductively connected to the metal shell 10 through a conductive member, and one end of the movable electrode 3 is suitable for extending out of one end of the metal shell 10 to be movably connected to a first lead 1, and the other end of the metal shell 10 is connected to a second lead 13, and a first elastic member 5 is arranged between the movable electrode 3 and the organic temperature sensor 9, and the first elastic member 5 is suitable for driving the movable electrode 3 to move toward the direction of the organic temperature sensor 9 when the organic temperature sensor 9 melts so that the movable electrode 3 is disconnected from the first lead 1.

[0023] Specifically, in this embodiment, the housing 12 is made of insulating materials such as ceramics and plastics to improve safety. The housing 12 is provided with openings at both ends, respectively used to fix the first lead 1 and the second lead 13. The first lead 1 passes through the housing 12, contacts the movable electrode 3, and is fixed with a sealing resin 2.

[0024] The metal shell 10 is made of metal, and the material thereof is not specifically limited, and can realize current conduction, for example, copper can be used. The metal shell 10 can move inside the shell 12. Furthermore, the metal shell 10 is coaxially arranged with the shell 12 and remains stable inside the shell 12. A cavity is formed inside the metal shell 10 for mounting the insulator 4, the movable electrode 3, etc.

[0025] Specifically, the metal shell 10 is located at one end of the movable electrode 3 and an insulator 4 is fixed therein, an active cavity suitable for the movable electrode 3 to move is formed inside the insulator 4, and the first elastic member 5 is pressed against the insulator 4. The insulator 4 can be made of materials such as ceramics. Here, an opening suitable for the insulator 4 to be placed is provided at the end of the metal shell 10, and a step can be provided on the inner surface of the metal shell 10 to limit the movement of the insulator 4. The open end of the metal shell 10 can be bent inward at a certain angle after the insulator 4 is placed, and the insulator 4 is clamped by the bent part to fix the insulator 4, so that there is no need to use other locking members to lock the insulator 4, which is conducive to simplifying the structure. The other end of the metal shell 10 is provided with an opening, and is fixed to the second lead 13, and can be electrically conductive with the second lead 13.

[0026] The insulator 4 is provided with an active cavity, and the active electrode 3 is provided in a T-shape, inserted in the active cavity, and can move in the active cavity. One end of the insulator 4 exposes the metal shell 10, and the active electrode 3 is adapted to be retracted into the active cavity under the push of the first elastic member 5 after the organic temperature sensing body 9 melts under high voltage or high current, thereby disconnecting from the first lead 1.

[0027] Here, the conductive member is provided at one end of the movable electrode 3 away from the first lead 1, and the conductive member can be a star-shaped spring 6, and of course other metal connectors can also be used. The movable electrode 3 is connected to the metal shell 10 through the star-shaped spring 6. Here, the star-shaped spring 6 is punched into an octagonal shape by a mold, and then formed into a bowl shape through secondary molding, so as to be snapped on the inner wall of the metal shell 10, and has a certain deformation ability. A second elastic member 7 is provided between the star-shaped spring 6 and the organic temperature sensor 9, and the two sides of the second elastic member 7 are respectively connected to the star-shaped spring 6 and the organic temperature sensor 9 through a supporting copper sheet 8 to maintain the stability of the connection. Here, the star-shaped spring 6 can be made of any one of copper, silver, silver-copper alloy, copper-plated silver, copper-plated nickel-silver, and copper-plated gold. Of course, it is not limited to this, and other metal materials that can conduct electricity are also within the protection scope of this embodiment. When the organic temperature sensor 9 melts, the second elastic member 7 loses support, so that the first elastic member 5 drives the movable electrode 3 to move toward the organic temperature sensor 9 under the elastic restoring force, so that the movable electrode 3 retracts into the insulator 4, thereby disconnecting the connection with the first lead 1, that is, disconnecting the circuit. In this embodiment, the metal shell 10 serves as a conductor between the movable electrode 3 and the second lead 13. Here, the first elastic member 5 can be a circuit breaker spring, and the second elastic member 7 can be a thick spring.

[0028] In this embodiment, the contact point between the movable electrode 3 and the first lead 1 is located outside the metal shell 10 and inside the housing 12. Therefore, the circuit cut-off position is outside the metal shell 10, with a larger electrical gap and creepage distance, and is not limited by the internal space during disconnection, isolating the influence of the arc on the circuit breaker spring and the star-shaped spring 6, improving the reliability of the current breaking performance, and greatly improving the safety performance.

[0029] In another embodiment, a third elastic member 11 is disposed inside one end of the metal shell 10 and the outer shell 12 to provide pressure for the movable electrode 3 to press against the first lead 1. When the movable electrode 3 is retracted into the insulator 4, the insulator 4 is directly pressed against the first lead 1. Here, the third elastic member 11 can use a spring as an auxiliary spring, so that the movable electrode 3 maintains a certain contact pressure with the first lead 1 to prevent poor circuit contact.

[0030] Example 2

[0031] Combination Figure 2 As shown, on the basis of an organic temperature fuse in Example 1, a contact layer is provided at the contact point between the active electrode 3 and the first lead 1 in this embodiment. In one embodiment, the contact layer can be a metal single substance or a metal composition as a matrix, and the surface is electroplated with a precious metal coating, and the metal single substance here can be copper, aluminum, etc.; in another embodiment, the contact layer can also be any one of silver, silver copper nickel, silver nickel, silver tin oxide, silver tin oxide indium oxide, silver zinc oxide, silver copper oxide nickel oxide, or a combination of any one of silver, silver copper nickel, silver nickel, silver tin oxide, silver tin oxide indium oxide, silver zinc oxide, and silver copper oxide nickel oxide. Of course, the contact layer is not limited to the materials listed above, and other materials with good conductive effects can also be used. Here, the contact layer is formed at the end contact point of the first lead 1 and the end contact point of the active electrode 3 by welding. For example, in one embodiment, the first lead 1 is welded with a silver tin oxide material at the end contact point using welding technology, and the active electrode 3 is compounded with a silver tin oxide material at the end contact point on the copper substrate. The contact parts of the first lead 1 and the movable electrode 3 are made of a mixed material of metal and metal oxide, which has a higher anti-corrosion capability and can be applied to circuits with higher voltage and current.

[0032] Compared with the organic thermal fuse currently available on the market, the circuit cut-off position of the embodiment of the utility model is outside the metal shell 10, with a larger electrical gap and creepage distance, and is not limited by the internal space during disconnection, thereby isolating the influence of the arc on the circuit breaker spring and the star-shaped spring leaf 6, and improving the reliability of the current breaking performance, thereby greatly improving the safety performance, so that the fuse can withstand higher voltages and larger currents.

[0033] It should be understood that the above are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

[0034] The above description of the drawings used in the implementation manner only shows certain embodiments of the utility model and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

Claims

1. An organic thermal fuse, comprising a housing, wherein a movable electrode is disposed in the housing, It is characterized in that Also includes: An organic temperature sensor and a metal shell, wherein the metal shell is arranged in the housing, and the movable electrode and the organic temperature sensor are installed inside the metal shell; the movable electrode is conductively connected to the metal shell through a conductive member, and one end of the movable electrode is suitable for extending out of one end of the metal shell to be movably connected to a first lead, and the other end of the metal shell is connected to a second lead; A first elastic member is arranged between the movable electrode and the organic temperature sensor, and the first elastic member is suitable for driving the movable electrode to move toward the organic temperature sensor when the organic temperature sensor melts so as to disconnect the movable electrode from the first lead; the metal shell is located at one end of the movable electrode and an insulator is fixed therein, an active cavity suitable for the movement of the movable electrode is formed inside the insulator, and the first elastic member is pressed tightly against the insulator.

2. The organic thermal fuse according to claim 1, It is characterized in that One end of the insulator is exposed from the metal shell, and the movable electrode is suitable for being retracted into the movable cavity under the push of the first elastic member after the organic temperature sensing body is melted.

3. The organic thermal fuse according to claim 1, It is characterized in that The conductive element is arranged at one end of the movable electrode away from the first lead, and the conductive element is a star-shaped spring.

4. The organic thermal fuse according to claim 3, It is characterized in that A second elastic member is arranged between the star-shaped reed and the organic temperature sensor, and two sides of the second elastic member are respectively connected to the star-shaped reed and the organic temperature sensor through supporting copper sheets.

5. The organic thermal fuse according to claim 3, It is characterized in that The star-shaped reed is made of any one of copper, silver, silver-copper alloy, copper plated with silver, copper plated with nickel silver, and copper plated with gold.

6. The organic thermal fuse according to claim 1, It is characterized in that A third elastic member is disposed inside the metal shell and one end of the outer shell to provide pressure for the movable electrode to press against the first lead.

7. The organic thermal fuse according to claim 1, It is characterized in that The contact point between the movable electrode and the first lead is located outside the metal shell and inside the outer shell.

8. The organic thermal fuse according to claim 1, It is characterized in that Contact layers are respectively arranged at contact points between the movable electrode and the first lead.

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