Chip PTC (Positive Temperature Coefficient) thermistor with high-temperature alarm function

Abstract

The utility model relates to the technical field of PTC (Positive Temperature Coefficient) thermistors, in particular to a chip type PTC thermistor with a high-temperature alarm function, which comprises a PTC thermistor chip, and a temperature sensing module and a central control module are arranged in the PTC thermistor chip; the outer surface of the PTC thermistor chip is wrapped with an insulating protective sleeve, heat-conducting glue is filled between the insulating protective sleeve and the heat-conducting protective shell, the pins and the rubber protective sleeves are tightly attached and fixed through a first sealing glue layer, and the rubber protective sleeves are tightly attached and fixed through a second sealing glue layer. According to the utility model, the heat generated by the PTC thermistor chip can be quickly conducted to the outer surface of the heat-conducting protective shell under the mutual matching of the heat-conducting glue and the heat-conducting protective shell and then is discharged outwards, so that the PTC thermistor chip plays a role in effective heat dissipation, and the service life of the PTC thermistor chip is prolonged. Therefore, the probability that the PTC thermistor chip is damaged due to the influence of high temperature for a long time is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of PTC thermistors, in particular to a chip-type PTC thermistor with a high-temperature alarm function. Background Art

[0002] Thermistors are a type of sensitive element, which are divided into positive temperature coefficient thermistors (PTC) and negative temperature coefficient thermistors (NTC) according to different temperature coefficients. The typical characteristic of a thermistor is its sensitivity to temperature, showing different resistance values at different temperatures. The resistance value of a positive temperature coefficient thermistor (PTC) becomes larger as the temperature increases, and the resistance value of a negative temperature coefficient thermistor (NTC) becomes lower as the temperature increases. They both belong to semiconductor devices.

[0003] The existing PTC thermistors have poor heat dissipation effect. During use, excessive temperature for a long time is likely to cause damage to themselves. In order to enable PTC thermistors to have better heat dissipation effect, it is necessary to design a chip-type PTC thermistor with a high-temperature alarm function. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and to propose a chip-type PTC thermistor with a high-temperature alarm function.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A chip-type PTC thermistor with a high-temperature alarm function, including a PTC thermistor chip, in which a temperature sensing module and a central control module are arranged; the outer surface of the PTC thermistor chip is wrapped with an insulating protective sleeve, and both the insulating protective sleeve and the PTC thermistor chip are located in a heat-conducting protective shell. A heat-conducting adhesive is filled between the insulating protective sleeve and the heat-conducting protective shell. The bottom end of the PTC thermistor chip is fixedly connected with two pins distributed left and right. The bottom end of the PTC thermistor chip is adhered with two rubber protective sleeves distributed left and right through an epoxy resin adhesive layer. The two pins are respectively located in the two rubber protective sleeves, and the two pins and the two rubber protective sleeves all penetrate downward through the insulating protective sleeve, the heat-conducting adhesive and the heat-conducting protective shell. The pins are closely attached and fixed to the rubber protective sleeves through a first sealing adhesive layer, and the rubber protective sleeves are closely attached and fixed through a second sealing adhesive layer.

[0006] Further, the insulating protective sleeve is made of polytetrafluoroethylene material.

[0007] Further, the rubber protective sleeve is made of ethylene propylene rubber material.

[0008] Further, the heat-conducting protective shell is an aluminum shell.

[0009] Furthermore, a plurality of first bumps are fixedly connected to both the front and rear ends of the heat-conducting protective case.

[0010] Furthermore, a plurality of second bumps are fixedly connected to the outer surface of the heat-conducting protective case in a circumferential direction.

[0011] The utility model has the following beneficial effects:

[0012] Compared with the prior art, for the chip-type PTC thermistor with a high-temperature alarm function, through the mutual cooperation of the heat-conducting adhesive and the heat-conducting protective case, the heat generated by the PTC thermistor chip can be quickly conducted to the outer surface of the heat-conducting protective case and then discharged outward, so that the PTC thermistor chip plays an effective role in heat dissipation, thereby reducing the probability of damage to the PTC thermistor chip due to being affected by high temperature for a long time.

[0013] Compared with the prior art, for the chip-type PTC thermistor with a high-temperature alarm function, through the action of the epoxy resin adhesive layer and the rubber protective sleeve, the connection end between the pin and the PTC thermistor chip can be strengthened. Specifically, the epoxy resin adhesive layer can not only fix the rubber protective sleeve, but also wrap around the connection end between the pin and the PTC thermistor chip, and then the rubber protective sleeve wraps around the upper end of the pin, so that the pin can be protected and the probability of the pin separating from the PTC thermistor chip can be reduced.

[0014] Compared with the prior art, for the chip-type PTC thermistor with a high-temperature alarm function, through the mutual cooperation of the first sealing adhesive layer and the second sealing adhesive layer, the space between the heat-conducting protective case and the rubber protective case and the space between the pin and the rubber protective sleeve can be sealed, preventing external water from entering the PTC thermistor chip along the spaces between the rubber protective case and the pin and between the pin and the rubber protective sleeve, thereby reducing the probability of the PTC thermistor chip being affected by moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. 1 is an overall structural schematic diagram of the front view of a chip-type PTC thermistor with a high-temperature alarm function proposed by the utility model;

[0016] Figure 2 FIG. 2 is a structural schematic diagram of the front view of a chip-type PTC thermistor with a high-temperature alarm function proposed by the utility model after partial sectioning;

[0017] Figure 3 FIG. 3 is an enlarged structural schematic diagram of A in a chip-type PTC thermistor with a high-temperature alarm function proposed by the utility model Figure 2 in the present utility model.

[0018] Legend Explanation:

[0019] 1. PTC thermistor chip; 2. Temperature sensing module; 3. Central control module; 4. Pin; 5. Insulating protective sleeve; 6. Thermal conductive adhesive; 7. Thermal conductive protective shell; 8. First bump; 9. Second bump; 10. Rubber protective sleeve; 11. First sealant layer; 12. Second sealant layer; 13. Epoxy resin adhesive layer. Detailed implementation mode

[0020] Refer to Figures 1-3 , a chip-type PTC thermistor with a high-temperature alarm function provided by the present utility model includes a PTC thermistor chip 1. A temperature sensing module 2 and a central control module 3 are arranged inside the PTC thermistor chip 1; an insulating protective sleeve 5 is wrapped on the outer surface of the PTC thermistor chip 1. Both the insulating protective sleeve 5 and the PTC thermistor chip 1 are located inside a thermal conductive protective shell 7. A thermal conductive adhesive 6 is filled between the insulating protective sleeve 5 and the thermal conductive protective shell 7. Two pins 4 distributed left and right are fixedly connected to the bottom end of the PTC thermistor chip 1. Two rubber protective sleeves 10 distributed left and right are adhered to the bottom end of the PTC thermistor chip 1 through an epoxy resin adhesive layer 13. The two pins 4 are respectively located inside the two rubber protective sleeves 10. The two pins 4 and the two rubber protective sleeves 10 both penetrate downward through the insulating protective sleeve 5, the thermal conductive adhesive 6, and the thermal conductive protective shell 7. The pins 4 are closely attached and fixed to the rubber protective sleeves 10 through a first sealant layer 11. The rubber protective sleeves 10 are closely attached and fixed through a second sealant layer 12. During operation, one end of one pin 4 is externally connected to an alarm. When the temperature sensing module 2 inside the PTC thermistor senses that the temperature value is greater than the set value, it will transmit a signal to the central control module 3, and the central control module 3 controls the alarm to sound an alarm, thereby realizing the function of high-temperature alarm and avoiding damage to the entire PTC thermistor chip 1 due to being in a high-temperature state for a long time. And through the mutual cooperation of the thermal conductive adhesive 6 and the thermal conductive protective shell 7, the heat generated by the PTC thermistor chip 1 can be quickly conducted to the outer surface of the thermal conductive protective shell 7 and then discharged outward, so that the PTC thermistor chip 1 plays an effective role in heat dissipation and avoids the overall device from being damaged by high temperature.

[0021] Furthermore, the insulating protective sleeve 5 is made of polytetrafluoroethylene material. During operation, polytetrafluoroethylene has excellent characteristics of insulation, high temperature resistance, low temperature resistance, and corrosion resistance, and is more durable when wrapping the PTC thermistor chip 1 for use.

[0022] Furthermore, the rubber protective sleeve 10 is made of ethylene propylene rubber material. During operation, the ethylene propylene rubber material has the advantages of electrical insulation, heat resistance, and low specific gravity. During specific use, it can protect the pins 4 and reduce the probability of the contact end of the pins 4 with the PTC thermistor chip 1 being stressed and broken.

[0023] Furthermore, the heat-conducting protective shell 7 is an aluminum shell. During operation, the aluminum shell has high thermal conductivity and can quickly conduct heat from the inside to the outer surface, improving the heat dissipation efficiency.

[0024] Furthermore, a plurality of first bumps 8 are fixedly connected to both the front and rear ends of the heat-conducting protective shell 7; a plurality of second bumps 9 are fixedly connected to the outer surface of the heat-conducting protective shell 7 in a circumferential manner. During operation, with the mutual cooperation of the first bumps 8 and the second bumps 9, when installing this device in an electrical equipment, when the heat-conducting protective shell 7 contacts the inner wall of the electrical equipment, it will not directly fit with the electrical equipment, and there is a gap between this device and the electrical equipment, facilitating air circulation and accelerating heat dissipation.

[0025] Working principle:

[0026] When in use, one end of a pin 4 is externally connected to an alarm. When the temperature sensing module 2 inside the PTC thermistor senses that the temperature value is greater than the set value, it will transmit a signal to the central control module 3, and the central control module 3 controls the alarm to give an alarm, thereby realizing the function of high-temperature alarm, avoiding the entire PTC thermistor chip 1 being damaged due to being in a high-temperature state for a long time. Through the mutual cooperation of the heat-conducting adhesive 6 and the heat-conducting protective shell 7, the heat generated by the PTC thermistor chip 1 can be quickly conducted to the outer surface of the heat-conducting protective shell 7 and then discharged outward, so that the PTC thermistor chip 1 plays an effective role in heat dissipation and reduces the probability of the overall equipment being damaged by high temperature.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A chip-type PTC thermistor with a high temperature alarm function, comprising a PTC thermistor chip (1), characterized in that: The PTC thermistor chip (1) is provided with a temperature sensing module (2) and a central control module (3) inside; the outer surface of the PTC thermistor chip (1) is wrapped with an insulating protective sleeve (5); the insulating protective sleeve (5) and the PTC thermistor chip (1) are both located in a thermally conductive protective shell (7); a thermally conductive adhesive (6) is filled between the insulating protective sleeve (5) and the thermally conductive protective shell (7); the bottom end of the PTC thermistor chip (1) is fixedly connected to two pins (4) distributed on the left and right; the PTC thermistor chip (1) is provided with a temperature sensing module (2) and a central control module (3); the outer surface of the PTC thermistor chip (1) is wrapped with an insulating protective sleeve (5); the insulating protective sleeve (5) and the PTC thermistor chip (1) are both located in a thermally conductive protective shell (7); a thermally conductive adhesive (6) is filled between the insulating protective sleeve (5) and the thermally conductive protective shell (7); two pins (4) distributed on the left and right are fixedly connected to the bottom end of the PTC thermistor chip (1); The bottom end of the resistor chip (1) is bonded to two rubber protective sleeves (10) distributed on the left and right by an epoxy resin adhesive layer (13); the two pins (4) are respectively located in the two rubber protective sleeves (10); the two pins (4) and the two rubber protective sleeves (10) both penetrate downward through the insulating protective sleeve (5), the thermal conductive adhesive (6) and the thermal conductive protective shell (7); the pins (4) are tightly fitted and fixed to the rubber protective sleeves (10) by a first sealing adhesive layer (11); and the rubber protective sleeves (10) are tightly fitted and fixed by a second sealing adhesive layer (12).

2. The chip PTC thermistor with high temperature alarm function according to claim 1, characterized in that: The insulating protective sleeve (5) is made of polytetrafluoroethylene material.

3. The chip PTC thermistor with high temperature alarm function according to claim 1, characterized in that: The rubber protective sleeve (10) is made of ethylene propylene rubber material.

4. The chip PTC thermistor with high temperature alarm function according to claim 1, characterized in that: The heat-conducting protective shell (7) is an aluminum shell.

5. The chip PTC thermistor with high temperature alarm function according to claim 1, characterized in that: A plurality of first protrusions (8) are fixedly connected to both the front and rear ends of the heat-conducting protective shell (7).

6. The chip PTC thermistor with high temperature alarm function according to claim 1, characterized in that: A plurality of second protrusions (9) are fixedly connected around the outer surface of the heat-conducting protective shell (7).

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