Resettable fuse with radiating fins

Abstract

The utility model belongs to the technical field of fuses, and particularly relates to a resettable fuse with cooling fins. The temperature-sensitive heat sink comprises a packaging shell, a first pole piece, a second pole piece, a temperature-sensitive conductive material, a first heat sink and a second heat sink. The packaging shell comprises a containing cavity, a first clamping jaw, a second clamping jaw, a first heat dissipation groove and a second heat dissipation groove. According to the self-recovery fuse with the cooling fins, the first pole piece and the second pole piece are clamped in the containing cavity through the first clamping jaw and the second clamping jaw, and the assembling reliability of the positive pole piece and the negative pole piece is improved. By arranging the first cooling fin and the second cooling fin on the two sides of the packaging shell, the internal heat dissipation efficiency is improved, and the self-recovery time of the fuse is shortened.

Description

Technical Field

[0001] The present application belongs to the technical field of fuses, and in particular relates to a resettable fuse with a heat sink. Background Art

[0002] The resettable fuse is a commonly used circuit protection component. It generally includes a positive electrode, a negative electrode, a packaging shell and a thermosensitive conductive material. The thermosensitive conductive material is sealed in the packaging shell, and the positive and negative electrodes are arranged at both ends of the packaging shell and electrically connected to the thermosensitive conductive material. In fact, this fuse does not distinguish between positive and negative electrodes. The thermosensitive material is generally a mixture of high molecular polymers and conductive particles. At room temperature, the thermosensitive conductive material is in a low resistance state; at high temperature, the thermosensitive conductive material is in a high resistance state. During use, when the current in the circuit to be protected is small, the thermosensitive conductive material is in a low resistance state, and the circuit is unobstructed. When the current is too large, the heat generation increases, the resistance of the thermosensitive conductive material increases, and it is converted to a high resistance state. The circuit is cut off and plays a protective role. When the circuit is cut off, on the one hand, the heat generation of the thermosensitive conductive material decreases, and on the other hand, the stored heat is continuously dissipated, and the thermosensitive conductive material gradually returns to the low resistance state at room temperature, thereby realizing the self-recovery function.

[0003] The existing resettable fuse has the problem of too long reset time and loose fixation of positive and negative poles during use. Utility Model Content

[0004] In view of this, the present application provides a resettable fuse with a heat sink to solve all or part of the technical problems described in the background technology section of the present application.

[0005] The solutions provided by this application to solve its technical problems are:

[0006] A resettable fuse with a heat sink, characterized in that:

[0007] It includes a packaging shell, a first pole piece, a second pole piece, a thermosensitive conductive material, a first heat sink, and a second heat sink; the packaging shell includes a receiving cavity, a first clamping claw, a second clamping claw, a first heat dissipation slot, and a second heat dissipation slot;

[0008] The first pole piece, the second pole piece, and the thermosensitive conductive material are arranged in the accommodating cavity, the first pole piece and the second pole piece are respectively located at two ends of the thermosensitive conductive material, and the first pole piece and the second pole piece are respectively clamped by a first clamping claw and a second clamping claw;

[0009] The first heat sink and the second heat sink are respectively arranged in the first heat sink and the second heat sink, and the first heat sink and the second heat sink are respectively arranged on both sides of the packaging shell.

[0010] Preferably, the first electrode plate and the second electrode plate are respectively provided with a first electrode hole and a second electrode hole.

[0011] Preferably, a first communicating hole is provided between the accommodating cavity and the first heat dissipation groove, and a second communicating hole is provided between the accommodating cavity and the second heat dissipation groove.

[0012] Preferably, the number of the first heat sink and the number of the second heat sink are both two.

[0013] Preferably, outer surfaces of the first heat sink and the second heat sink are lower than the outer surface of the packaging shell.

[0014] Beneficial technical effects:

[0015] The resettable fuse with heat sink disclosed in the present application clamps the first and second pole pieces in the accommodating cavity by means of the first and second clamping claws, thereby improving the reliability of the assembly of the positive and negative pole pieces. By arranging the first and second heat sinks on both sides of the packaging shell, the efficiency of internal heat dissipation is improved, and the time for the fuse to self-recover is reduced.

[0016] The technical solution and technical effects of the present application are described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : A perspective view of the resettable fuse structure with a heat sink;

[0018] Figure 2 : Figure 1 A top view of

[0019] Figure 3 : Schematic diagram of the heat sink and heat sink structure;

[0020] Figure 4 : Current-temperature diagram of resettable fuse with heat sink;

[0021] Icon Description:

[0022] 10-packaging shell, 20-first pole piece, 30-second pole piece, 40-thermosensitive conductive material, 50-first heat sink, 60-second heat sink;

[0023] 110 - accommodating cavity, 120 - first clamping claw, 130 - second clamping claw, 140 - first heat dissipation groove, 150 - second heat dissipation groove, 160 - first connecting hole, 170 - second connecting hole;

[0024] 210 - first electrode hole, 310 - second electrode hole. DETAILED DESCRIPTION

[0025] See also Figures 1 to 3The resettable fuse with a heat sink disclosed in the present application includes a packaging shell 10, a first pole piece 20, a second pole piece 30, a thermosensitive conductive material 40, a first heat sink 50, and a second heat sink 60.

[0026] The package shell 10 is made of insulating plastic material, the first pole piece 20 and the second pole piece 30 are conductors, and the first heat sink 50 and the second heat sink 60 are heat dissipation materials. The thermosensitive conductive material 40 is composed of high molecular organic polymer and conductive particles, and has the characteristics of low resistance at room temperature and high resistance at high temperature.

[0027] The packaging shell 10 generally has a rectangular parallelepiped structure, on which a receiving cavity 110, a first clamping claw 120, a second clamping claw 130, a first heat dissipation slot 140, and a second heat dissipation slot 150 are arranged. The receiving cavity 110 is arranged inside the packaging shell 10, the first clamping claw 120 and the second clamping claw 130 are located at both ends of the receiving cavity 110, and the first heat dissipation slot 140 and the second heat dissipation slot 150 are arranged on two sides of the packaging shell 10. A first connecting hole 160 and a second connecting hole 170 are respectively arranged between the first heat dissipation slot 140, the second heat dissipation slot 150 and the receiving cavity 110. The first clamping claw 120 and the second clamping claw 130 are formed by adding materials from both sides of the packaging shell 10 to the middle.

[0028] The first pole piece 20, the second pole piece 30, and the thermosensitive conductive material 40 are disposed in the accommodating cavity 110. The first pole piece 20 and the second pole piece 30 are respectively located at two ends of the thermosensitive conductive material 40 and are respectively clamped by the first clamping claw 120 and the second clamping claw 130. The first pole piece 20 and the second pole piece 30 are respectively provided with a first electrode hole 210 and a second electrode hole 310.

[0029] Clamping the first and second pole pieces in the accommodating cavity by the first and second clamping claws is beneficial to improving the reliability of the positive and negative pole piece structures.

[0030] The first heat sink 50 and the second heat sink 60 are respectively disposed in the first heat sink 140 and the second heat sink 150, and the first heat sink 140 and the second heat sink 150 are respectively disposed on both sides of the package shell 10. The number of the first heat sink 50 and the second heat sink 60 are both two, and the outer surfaces of the first heat sink 50 and the second heat sink 60 are both lower than the outer surface of the package shell 10.

[0031] By arranging the first and second heat sinks on both sides of the packaging shell, the efficiency of internal heat dissipation is improved and the self-recovery time of the fuse is reduced.

[0032] Principle and effect description:

[0033] Installing the resettable fuse into the circuit to be protected and selecting the technical parameters such as current and temperature are common knowledge in this field and will not be elaborated here.

[0034] When the working current is within the normal variation range, the fuse does not generate much heat, the thermistor conductive material is in a low resistance state, and the heat generation and heat dissipation of the fuse are in a balanced state.

[0035] When the working current suddenly increases, the heat generated by the fuse increases, the internal temperature rises rapidly, and the thermistor conductive material switches to a high-resistance state. At this time, the current in the circuit decreases (due to the increase in resistance), which shows that the circuit is disconnected. After the working current returns to normal (after the circuit fault is eliminated), the heat generated by the thermistor conductive material decreases, and the heat stored in the fuse is continuously dissipated from the first and second heat sinks. The thermistor conductive material gradually drops to normal temperature and returns to a low-resistance state, and the circuit returns to normal.

[0036] Figure 4 The current-temperature diagram of the resettable fuse with heat sink disclosed in this application is shown in FIG. Figure 4 It can be seen that the current flowing through the fuse decreases continuously with the increase of temperature, and the change trend is linear, which has good thermoelectric characteristics.

[0037] The technical scheme and technical effects of the present application are described in detail above in combination with the drawings and specific embodiments of the specification. It should be noted that technicians in this field can also develop other embodiments on this basis; any simple deformation and equivalent substitution that does not deviate from the innovative concept of the present application are covered by the present application and belong to the scope of protection of this patent.

Claims

1. A resettable fuse with a heat sink, characterized in that: It comprises a packaging shell (10), a first pole piece (20), a second pole piece (30), a thermosensitive conductive material (40), a first heat sink (50), and a second heat sink (60); The packaging shell (10) comprises a containing cavity (110), a first clamping claw (120), a second clamping claw (130), a first heat dissipation slot (140), and a second heat dissipation slot (150); The first pole piece (20), the second pole piece (30), and the thermosensitive conductive material (40) are arranged in the accommodating cavity (110); the first pole piece (20) and the second pole piece (30) are respectively located at two ends of the thermosensitive conductive material (40); the first pole piece (20) and the second pole piece (30) are respectively clamped by the first clamping claw (120) and the second clamping claw (130); The first heat sink (50) and the second heat sink (60) are respectively arranged in the first heat sink (140) and the second heat sink (150); the first heat sink (140) and the second heat sink (150) are respectively arranged on both sides of the packaging shell (10).

2. The resettable fuse with a heat sink according to claim 1, characterized in that: The first pole piece (20) and the second pole piece (30) are respectively provided with a first electrode hole (210) and a second electrode hole (310).

3. The resettable fuse with a heat sink according to claim 1, characterized in that: A first communication hole (160) is provided between the accommodating cavity (110) and the first heat dissipation groove (140), and a second communication hole (170) is provided between the accommodating cavity (110) and the second heat dissipation groove (150).

4. The resettable fuse with a heat sink according to claim 1, characterized in that: The number of the first heat sink (50) and the number of the second heat sink (60) are both two.

5. The resettable fuse with heat sink according to claim 1, characterized in that: The outer surfaces of the first heat sink (50) and the second heat sink (60) are lower than the outer surface of the packaging shell (10).

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