CN201434734Y

CN201434734Y - ntc temperature sensor

Info

Publication number: CN201434734Y
Application number: CN2009200477725U
Authority: CN
Inventors: 汪洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-16
Filing date: 2009-07-16
Publication date: 2010-03-31
Anticipated expiration: 2019-07-16

Abstract

The utility model relates to an NTC temperature sensor, which belongs to the technical field of electronic product manufacture. The NTC temperature sensor comprises a thermistance chip which is respectively welded with the inner ends of two adjacent conductive wires, wherein the thermistance chip and parts of the adjacent conductive wires needing to be insulated are integrally covered by flexibleepoxide resin for forming an integral insulating outer layer. The utility model adopts an unconventional manufacture method for forming an unique integral insulating layer structure, omits the complicated peeling working procedure, and obviously improves the work efficiency, and in addition, the insulating layer outside the temperature sensor is finally and completely formed by dipping with the flexible epoxide resin, so the insulating outer layer has the advantages of good integral performance, no seam and difficult crack occurrence, and is favorable for ensuring the stable and reliable performance of the temperature sensor.

Description

A kind of NTC temperature sensor

Technical field

The utility model relates to a kind of temperature sensor, and especially a kind of NTC temperature sensor belongs to electronic products manufacturing technology field.

Background technology

NTC themistor has high sensitivity and lower price, so suitable to especially temperature sensor.In-55 ℃～+ 300 ℃ temperature range, with NTC themistor or NTC thermistor chip temperature sensor as core parts---be called for short the NTC temperature sensor in industrial automation, instrument and meter, automotive electronics, medical electronics, household electrical appliance, space flight and aviation, fields such as computing machine are widely used, and only household electrical appliance just have: domestic air conditioning, refrigerator, refrigerator, water heater, water dispenser, warm-air drier, dish-washing machine, disinfection cabinet, washing machine, dryer, oven, electromagnetic oven, soy bean milk making machine, toaster, charger for mobile phone, charger for electric bicycle, rechargeable battery, Electronic desk calendar etc.

This NTC temperature sensor adopts NTC themistor or NTC themistor chip as core parts, can make all styles of according to the difference of its purposes.The sensing head structural difference that the main difference of existing various NTC temperature sensors is to be enclosed with NTC themistor or NTC themistor chip is very big, but no matter contour structures has great difference, its extension line overwhelming majority all is PVC or resistant to elevated temperatures Teflon insulated conductor.For a long time, owing to adopt following manufacturing process, so its structure is as shown in Figure 1: 1) unwrapping wire peeling---the fixed-length cut-off insulated conductor, peel off the insulation sheath 1 of termination; 2) wicking---scolding tin is dipped in the plain conductor termination 2 of exposing after the peeling; 3) welding---wicking lead termination 2 and thermal resistor chip 3 are welded together; 4) seal curing---

thermal resistor chip

3 and 2 welding positions, lead termination are wrapped up with epoxy resin, behind baking-curing, form insulation and seal outer 4.

Above technological process relies on manual operations basically, and efficient is very low, and seals and be difficult to reliable fully the fusion between original insulation course of epoxy resin and insulated conductor, occurs crackle easily after the bending repeatedly, thereby influences insulating property.

The utility model content

The purpose of this utility model is: the problem at above-mentioned prior art exists proposes a kind of NTC temperature sensor that can guarantee the product insulating property.

In order to reach above purpose, the utility model NTC temperature sensor contains thermistor chip, weld respectively the inner of described thermistor chip and two adjacent wires, it is characterized in that: the need insulated part of described thermistor chip and adjacent wires is the flexible-epoxy integral coating, forms the integral insulation skin.

Its manufacturing process may further comprise the steps:

The first step, the intercepting naked lead of Len req (preferably tinned wird or CP wire);

Second step, the termination and the thermistor chip of naked tinned wire welded together, become thermal resistor;

The 3rd step, the thermal resistor chip is partly immersed ordinary epoxy resin, baking-curing forms integument;

In the 4th step, the thermal resistor immersion flexible-epoxy liquid with above-mentioned formation integument, thermistor chip all immerses, and the immersion depth of tinned wire equals required insulated lengths; For guaranteeing the good insulation performance withstand voltage properties, can adopt the repeatedly method of dipping, the viscosity of its epoxy resin should suitably be controlled.

The thermal resistor of flexible-epoxy is dipped in the 5th step, taking-up, and baking-curing forms the flexible-epoxy insulating outer layer that is wrapped in thermistor chip and tinned wire insulating segment, makes temperature sensor.

The utility model has adopted off the beaten track method for making, has formed unique integral insulation layer structure.Not only save loaded down with trivial details peeling operation, significantly improved work efficiency, and the outer insulation course of finishing temperature sensor forms by dipping flexible-epoxy fully, so insulating outer layer good integrity, do not have the slit, be not prone to crackle, help to guarantee the reliable and stable of temperature sensor performance.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the arrangement of temperature sensor synoptic diagram of prior art.

Fig. 2 is the structural representation of an embodiment of the utility model.

Embodiment

Embodiment one

The NTC temperature sensor of present embodiment is referring to Fig. 2, weld with the inner of two adjacent naked tinned wird or CP wire lead 2 respectively the both sides of rectangle thermistor chip 3, it is flexible-epoxy 4 integral coating that thermistor chip 3 and adjacent wires 2 need insulated part, forms the integral insulation skin.

Use needs in order to satisfy better, the outer field thermistor chip end of coated insulation inserts in the metal shell 5 (barrel shell, aluminum hull or stainless steel case); Insulating material 6 such as the gap encapsulated epoxy resin of metal shell.

Through processing such as overcurings, measure again, voltage-withstand test, just can make sensing head is the NTC temperature sensor of various desired structures and shape.

The above-mentioned NTC manufacturing method of temperature sensor of present embodiment does not adopt PVC or Teflon (high temperature resistant) electric wire as extension line, diameter is very thin (to be generally the tinned wird of Φ 0.15～0.45mm) or the CP wire extension line as sensor but directly adopt, then by adopting the strong epoxy resin of pliability to flood, it is good to form strong, the cold-resistant heat-resistant impact ability of one deck pliability behind overcuring, and dielectric voltage withstand performance good insulation performance layer.Because the adhesion of this epoxy resin and above-mentioned lead-in wire is strong especially, and pliability is good, do not ftracture, come off through the folding test of spending for 350 times 90, its physical property and electric property and PVC or Teflon electric wire are almost as broad as long.

The exit of the NTC temperature sensor lead of present embodiment i.e. two separately (referring to Fig. 1), also can be two mutually insulateds and together, form two doublings (referring to Fig. 2), can generate fully and PVC lead or the essentially identical contour structures of Teflon lead, and the length of lead-out wire that adopts impregnation enveloping technology to form is adjustable.

Claims

1. NTC temperature sensor, contain thermistor chip, weld respectively the inner of described thermistor chip and two adjacent wires, it is characterized in that: the need insulated part of described thermistor chip and adjacent wires is the flexible-epoxy integral coating, forms the integral insulation skin.

2. according to the manufacture method of the described NTC temperature sensor of claim 1, it is characterized in that also comprising: described lead is tinned wird or CP wire.

3. according to the manufacture method of the described NTC temperature sensor of claim 2, it is characterized in that: two of the exits of described lead separate.

4. according to the manufacture method of the described NTC temperature sensor of claim 2, it is characterized in that: two mutually insulateds of the exit of described lead form two doublings also together.

5. according to the manufacture method of claim 3 or 4 described NTC temperature sensors, it is characterized in that: the diameter of described lead is Φ 0.15～0.45mm.