CN113670462A - Single-end glass-sealed resistance temperature sensor and manufacturing method thereof - Google Patents

Abstract

The invention relates to the field of temperature sensors, in particular to a single-ended glass-sealed resistance temperature sensor and a manufacturing method thereof. The connecting wire comprises a resistor unit and a connecting part arranged at the end part of the resistor unit, wherein the resistor unit comprises two resistor pins and a glass sealing resistor head part internally provided with a thermistor, one end of each resistor pin is correspondingly connected with the two ends of the thermistor respectively, the other end of each resistor pin extends out of the glass sealing resistor head part and bends towards the direction of the glass sealing resistor head part to form a bending part, and the two bending parts are electrically connected with the connecting part respectively. Through the one end of keeping away from glass seal resistance head with the resistance pin in this application buckle and constitute and buckle and constitute the portion of bending toward glass seal resistance head direction, can reduce resistance weld back, the OD and the length dimension problem of the follow-up encapsulation of whole product for head dimension OD and the length that can reach sensor have comparatively strict requirement in the specific service environment.

Description

Single-end glass-sealed resistance temperature sensor and manufacturing method thereof

Technical Field

The invention relates to the field of temperature sensors, in particular to a single-ended glass-sealed resistance temperature sensor and a manufacturing method thereof.

Background

A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument, has a wide variety and can be suitable for various different working environments. However, some working environments have more strict requirements on the head size OD and length of the sensor

At present, a relatively uniform process is formed in a packaging mode of a temperature sensor, but the problem that the requirements on the head OD and the length dimension of the sensor are smaller cannot be met until now, and the details are as follows:

1) glass sealing resistance: after the glass sealing resistor is welded with the wire, epoxy resin is encapsulated, generally, in order to increase the sealing property of a product, the encapsulation frequency can be as many as two to three times, so that the OD of the head of the product can reach about 5mm, and the length can reach 18 mm;

2) single-ended glass-sealed resistor: the single-end resistance is similar to the glass-sealed resistance process, epoxy resin is encapsulated after the wire is welded, and due to the fact that the resistance shapes are different, the OD size can be improved to a certain extent, but the length is still more than 10 mm;

3) epoxy resin encapsulation thermistor: since the resistor itself is encapsulated with epoxy resin, and then is subjected to secondary resin encapsulation after being welded with wires, the OD and length dimensions still cannot reach below OD 3mm, and the length is below 10 mm.

Disclosure of Invention

In the present application, one end of the resistor pin, which is far away from the head of the glass-sealed resistor, is bent to form a bent portion bent toward the head of the glass-sealed resistor, so that the problems of OD and length dimensions of subsequent packaging of the whole product after resistance welding can be reduced, and the requirements of the head dimension OD and length of the sensor in a specific use environment can be met.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a single-ended glass-sealed resistance temperature sensor, includes resistance unit, its tip is provided with the connecting wire of connecting portion, wherein resistance unit includes two resistance pins, embeds there is thermistor's glass-sealed resistance head, wherein the one end of two resistance pins corresponds with thermistor's both ends respectively and is connected, the other end of two resistance pins all extends glass-sealed resistance head and toward glass-sealed resistance head direction buckle and constitute the portion of bending, and two portions of bending respectively with connecting portion electric connection.

Furthermore, the two bending parts are deviated towards the directions away from each other, and the two bending parts are placed in a shape like a Chinese character 'ba'.

Furthermore, the tail end of the bending part is also integrally formed with a bending connecting end which is parallel to the corresponding connecting part.

Furthermore, the junction of connecting wire and connecting portion is provided with the portion of bending of stepping down, and wherein two the portions of bending of stepping down bend to the direction of keeping away from each other, then two have stepped down and have constituted a gap of stepping down between the portion of bending, just glass-sealed resistor head is located this gap of stepping down.

Further, the heat-shrinkable tube is used for wrapping the connecting part and the resistance unit.

Further, the connecting portions of the two connecting wires are parallel to each other.

The application also provides a manufacturing method of the single-ended glass-sealed resistance temperature sensor, which comprises the following steps: step 1, welding two resistance pins of a resistance unit with connecting parts of two connecting wires;

and 2, bending one end of the resistor pin, which is far away from the head of the glass-sealed resistor, to form a bent part, bending the resistor pin towards the head of the glass-sealed resistor, and offsetting the two bent parts towards the directions far away from each other, so that the two bent parts are arranged in a splayed shape.

The invention has the beneficial effects that: through the one end of keeping away from glass seal resistance head with the resistance pin in this application buckle and constitute and buckle and constitute the portion of bending toward glass seal resistance head direction, can reduce resistance weld back, the OD and the length dimension problem of the follow-up encapsulation of whole product for head dimension OD and the length that can reach sensor have comparatively strict requirement in the specific service environment.

Drawings

Fig. 1 is a schematic structural view of a temperature sensor.

Fig. 2 is a schematic view of the structure of the connection wire.

Fig. 3 is a schematic diagram of a structure of the resistance unit.

The reference numbers illustrate: the glass-sealed resistor comprises a glass-sealed resistor head 11, a resistor pin 12, a bent part 13, a bent connecting end 131, a connecting wire 2, a connecting part 21, an abdicating bent part 22 and an abdicating gap 23.

Detailed Description

Referring to fig. 1 to 3, the present invention relates to a single-ended glass-sealed resistance temperature sensor, which includes a resistance unit and a connecting wire 2 having a connecting portion 21 at an end thereof, wherein the resistance unit includes two resistance pins 12 and a glass-sealed resistance head portion 11 having a thermistor therein, wherein one end of each of the two resistance pins 12 is correspondingly connected to two ends of the thermistor, the other end of each of the two resistance pins 12 extends out of the glass-sealed resistance head portion 11 and bends toward the glass-sealed resistance head portion 11 to form a bending portion 13, and the two bending portions 13 are electrically connected to the connecting portion 21, respectively.

Further, the two bending portions 13 are offset in the direction away from each other, and the two bending portions 13 are arranged in a shape of a Chinese character 'ba'. Two portions of bending 13 are "eight" word and put and to guarantee that two portions of bending 13 keep the certain distance that meets, avoid signal interference or direct contact to influence normal work.

Further, the end of the bending portion 13 is integrally formed with a bending connection end 131 parallel to the corresponding connection portion 21, and the bending connection end 131 can be conveniently welded to the connection portion 21.

Further, the joint of the connecting wire 2 and the connecting portion 21 is provided with a yielding bending portion 22, wherein two yielding bending portions 22 are bent in the direction away from each other, so that a yielding gap 23 is formed between the two yielding bending portions 22, and the glass-sealed resistor head 11 is located on the yielding gap 23. The glass-sealed resistor head 11 is bent on the abdicating gap 23, so that the problem of the length and the size of the whole product can be effectively reduced.

Further, a heat shrinkable tube is included, which wraps the connection portion 21 and the resistance unit.

Further, the connecting portions 21 of the two connecting wires 2 are parallel to each other.

The application also provides a manufacturing method of the single-ended glass-sealed resistance temperature sensor, which comprises the following steps: step 1, welding two resistance pins 12 of a resistance unit with connecting parts 21 of two connecting wires 2;

and 2, bending one end of the resistor pin 12, which is far away from the glass-sealed resistor head 11, to form a bent part 13, which is bent towards the direction of the glass-sealed resistor head 11, and offsetting the two bent parts 13 towards the directions far away from each other, so that the two bent parts 13 are arranged in a splayed shape.

In a specific embodiment, a 5.Φ 3.5mm transparent heat shrink tubing is used, length: 6.5 mm;

2. electric wire, OD: 1mm, core OD: 0.6mm

3. Resistance pin 12 OD: 0.2mm, resistance bending length: 1.77mm

4.58D small head resistance, resistance head OD: 1.17mm, total length after bending: 5.43 mm.

In summary, in the present application, the resistor pin 12 is bent at an end away from the glass-sealed resistor head 11 to form the bent portion 13, so that the OD and length size problems of subsequent packaging of the whole product after resistance welding can be reduced, and the head size OD and length of the sensor in a specific use environment can meet strict requirements.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims (7)

1. A single-ended glass-sealed resistance temperature sensor is characterized in that: the connecting wire comprises a resistor unit and a connecting part arranged at the end part of the resistor unit, wherein the resistor unit comprises two resistor pins and a glass sealing resistor head part internally provided with a thermistor, one end of each resistor pin is correspondingly connected with the two ends of the thermistor respectively, the other end of each resistor pin extends out of the glass sealing resistor head part and bends towards the direction of the glass sealing resistor head part to form a bending part, and the two bending parts are electrically connected with the connecting part respectively.

2. The single-ended glass-sealed resistance temperature sensor of claim 1, wherein: the two bending parts are deviated towards the directions away from each other, and the two bending parts are placed in a shape like a Chinese character 'ba'.

3. A single-ended glass-sealed resistance temperature sensor according to claim 1 or 2, wherein: the tail end of the bending part is also integrally formed with a bending connecting end parallel to the corresponding connecting part.

4. The single-ended glass-sealed resistance temperature sensor of claim 1, wherein: the junction of connecting wire and connecting portion is provided with the portion of stepping down of bending, and wherein two step down of bending bend the portion toward the direction of keeping away from each other and bend, then two step down of bending have constituted a gap of stepping down between the portion of stepping down, just glass seal resistance head is located this gap of stepping down.

5. The single-ended glass-sealed resistance temperature sensor of claim 3, wherein: the heat-shrinkable tube is used for wrapping the connecting part and the resistor unit.

6. The single-ended glass-sealed resistance temperature sensor of claim 3, wherein: the connecting portions of the two connecting wires are parallel to each other.

7. The method of manufacturing a single-ended glass-sealed resistance-welded bend-after-bend temperature sensor of claim 1,

the method comprises the following steps: step 1, welding two resistance pins of a resistance unit with connecting parts of two connecting wires;

and 2, bending one end of the resistor pin, which is far away from the head of the glass-sealed resistor, to form a bent part, bending the resistor pin towards the head of the glass-sealed resistor, and offsetting the two bent parts towards the directions far away from each other, so that the two bent parts are arranged in a splayed shape.

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