CN210223688U - NTC thermistor - Google Patents

Abstract

The utility model discloses a NTC thermistor relates to the temperature sensor field, has solved the problem that NTC thermistor became invalid easily under high temperature among the prior art, and its technical essential is: the glass-coated negative temperature coefficient thermistor comprises an NTC thermosensitive chip and electrode pins, wherein the electrode pins are fixedly connected with two poles of the NTC thermosensitive chip, insulating layers are covered on the outer sides of the NTC thermosensitive chip and the electrode pins, and the outer side of the NTC thermosensitive chip is also provided with glass which is covered on the outer side of the NTC thermosensitive chip; the utility model discloses an at the outside cover glass of temperature sensing chip, improved the joint strength of temperature sensing chip and electrode to make solder joint melt back temperature sensing chip and electrode and do not break away from, for prior art, the utility model discloses high temperature resistance can be higher, the problem that the inefficacy appears can not go out under the high temperature.

Description

NTC thermistor

Technical Field

The utility model relates to a temperature sensor field especially relates to a NTC thermistor.

Background

An NTC thermistor is a negative temperature coefficient nonlinear resistor which is sensitive to temperature reaction and the resistance value of which can change along with the change of temperature, and is a semiconductor ceramic element which is manufactured by taking high-purity transition metal oxides, such as manganese, cobalt, nickel, iron and other metal oxides, as main materials and adopting a ceramic process. A thermistor is used as a temperature measuring element, and a heating or cooling system is adjusted according to the measured temperature, so that intelligent temperature control is realized. The NTC thermistor can be widely applied to temperature measurement, temperature control, temperature compensation and the like.

In the existing NTC thermistor in the form of thin film package in the market, the electrodes and the leads of the resistor chip are soldered, the highest temperature of normal use is 120 ℃, and when the temperature exceeds 120 ℃, the soldering points are easily damaged, so that the problem of open circuit or short circuit of the thermistor package in a high-temperature environment is caused.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to above-mentioned defect, provide an NTC thermistor, including NTC temperature sensing chip and electrode pin, electrode pin fixed connection has the two poles of the earth of NTC temperature sensing chip, and the outside of NTC temperature sensing chip and electrode pin covers there is the insulating layer, and the outside of NTC temperature sensing chip still is equipped with glass, and glass covers in the outside of NTC temperature sensing chip to solve among the prior art NTC thermistor problem that becomes invalid easily under high temperature.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a NTC thermistor, includes NTC heat-sensitive chip and electrode pin, and electrode pin fixed connection has the two poles of the earth of NTC heat-sensitive chip, and the outside of NTC heat-sensitive chip and electrode pin covers has the insulating layer, and the outside of NTC heat-sensitive chip still is equipped with glass, and glass covers in the outside of NTC heat-sensitive chip.

As a further proposal of the utility model, the glass is borosilicate glass.

As a further proposal of the utility model, the thickness of the insulating layer is 0.02-0.1 mm.

As a further proposal of the utility model, the thickness of the insulating layer is 0.04-0.06 mm.

As a further proposal of the utility model, the thickness of the thermistor is 1-1.6 mm.

As a further proposal of the utility model, the thickness of the thermistor is 1.2-1.4 mm.

To sum up, compared with the prior art, the utility model has the following beneficial effects:

the utility model discloses an at the outside cover glass of temperature sensing chip, improved the joint strength of temperature sensing chip and electrode to make solder joint melt back temperature sensing chip and electrode and do not break away from, for prior art, the utility model discloses high temperature resistance can be higher, the problem that the inefficacy appears can not go out under the high temperature.

Drawings

Fig. 1 is a schematic structural view of an NTC thermistor.

Fig. 2 is a plan view of the NTC thermistor.

Reference numerals: 1-NTC heat-sensitive chip, 2-electrode pin, 3-glass, 4-insulating layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

Example 1

As shown in fig. 1 to 2, an NTC thermistor includes an NTC thermal chip 1 and electrode pins 2, the electrode pins 2 are fixedly connected to two poles of the NTC thermal chip 1, the outer sides of the NTC thermal chip 1 and the electrode pins 2 are covered with an insulating layer 4, the outer side of the NTC thermal chip 1 is further provided with glass 3, and the glass 3 is covered on the outer side of the NTC thermal chip 1;

the NTC heat-sensitive chip 1 is the prior art, and the electrode pins 2 are fixed at two ends of the NTC heat-sensitive chip 1 in a welding way; the glass 3 is ordinary glass, the glass 3 is packaged on the NTC thermosensitive chip 1 when in a hot melting state, the thickness of the insulating layer 4 is 0.02-0.1 mm, the insulating layer 4 is made of a high-temperature-resistant insulating material, and in the example, the insulating layer 4 is made of polytetrafluoroethylene;

preferably, the thermistor has a thickness of 1 to 1.6 mm and a length of 10 to 60 mm.

Example 2

As shown in fig. 1 to 2, an NTC thermistor includes an NTC thermal chip 1 and electrode pins 2, the electrode pins 2 are fixedly connected to two poles of the NTC thermal chip 1, the outer sides of the NTC thermal chip 1 and the electrode pins 2 are covered with an insulating layer 4, the outer side of the NTC thermal chip 1 is further provided with glass 3, and the glass 3 is covered on the outer side of the NTC thermal chip 1;

the NTC heat-sensitive chip 1 is the prior art, and the electrode pins 2 are fixed at two ends of the NTC heat-sensitive chip 1 in a welding way; the glass 3 is high borosilicate glass, the glass 3 is encapsulated on the NTC heat-sensitive chip 1 when in a hot melting state, the thickness of the insulating layer 4 is 0.04-0.05 mm, the insulating layer 4 is a high-temperature resistant insulating material, and in the example, the insulating layer 4 is polyfluorinated ethylene;

preferably, the thermistor has a thickness of 1.2 to 1.4 mm and a length of 25 to 50 mm.

To sum up, the utility model discloses a theory of operation is:

glass 3 has high temperature resistance, and glass 3 can not take place to soften deformation under 120 ℃ to make NTC heat-sensitive chip 1 and electrode pin 2's solder joint melt the back under high temperature, NTC heat-sensitive chip 1 can not break away from with electrode pin 2, and then guaranteed NTC heat-sensitive chip 1 and electrode pin 2's contact, make the thermistor performance can not change.

It should be particularly noted that the working principle of the thermistor in the present application is an application in the prior art, and the strength for reinforcing the connection between the thermosensitive chip and the pins by encapsulating the glass onto the thermosensitive chip and the pins is an innovative point of the present application, which effectively solves the problem that the NTC thermistor in the prior art is easy to fail at high temperature.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a NTC thermistor, includes NTC heat-sensitive chip (1) and electrode pin (2), and electrode pin (2) fixed connection has two poles of the earth at NTC heat-sensitive chip (1), and the outside of NTC heat-sensitive chip (1) and electrode pin (2) covers has insulating layer (4), its characterized in that, and the outside of NTC heat-sensitive chip (1) still is equipped with glass (3), and glass (3) cover is in the outside of NTC heat-sensitive chip (1).

2. The NTC thermistor according to claim 1, characterized in that the glass (3) is a high borosilicate glass.

3. The NTC thermistor according to claim 2, characterized in that the thickness of the insulating layer (4) is 0.02-0.1 mm.

4. The NTC thermistor according to claim 3, characterized in that the thickness of the insulating layer (4) is 0.04-0.06 mm.

5. The NTC thermistor according to any of claims 1 to 4, characterized in that the thickness of the thermistor is 1 to 1.6 mm.

6. The NTC thermistor according to claim 5, wherein the thickness of the thermistor is 1.2-1.4 mm.

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