CN215492106U - Quick-response high-precision temperature sensor - Google Patents

Abstract

The utility model discloses a fast reaction high-precision temperature sensor.A two negative electrode thermocouple wires and a plurality of thermal resistance conductors are respectively penetrated into an insulator bead string with a porous structure, the insulator bead string, the two negative electrode thermocouple wires and the plurality of thermal resistance conductors are penetrated into a metal pipe to be manufactured into a special armor, one special armor end is stripped to form a section of negative electrode thermocouple wire and a thermal resistance conductor, the plurality of thermal resistance conductors are welded with a thermal resistance element to form a thermal resistance, the two negative electrode thermocouple wires are welded with the positive electrode thermocouple wire and the negative electrode thermocouple wire of an armored thermocouple, the positive electrode thermocouple wire and the negative electrode thermocouple wire of the armored thermocouple form a measuring point, the measuring point is consistent with the position of the thermal resistance element in height, a sleeve head is welded with the special armor and filled with an insulator, and a support sleeve penetrates through the armored thermocouple to be welded with the sleeve head and is sealed and welded with the armored thermocouple; the signals of the thermal resistor and the thermocouple are input into the intelligent secondary instrument. The utility model relates to a temperature sensor combining high precision of a thermal resistor and a quick response function of a thermocouple.

Description

Quick-response high-precision temperature sensor

Technical Field

The present invention relates to a temperature sensor, and more particularly, to a temperature sensor which can thermally react rapidly to a temperature change and has high accuracy, and which is composed of two types of sensors.

Background

Generally, the contact type temperature sensor includes a thermocouple, a thermal resistor, a bimetallic thermometer, a pressure type thermometer and the like, and the thermocouple and the thermal resistor are mainly used for transmitting a remote signal. The single thermocouple and the single resistance are obviously distinguished in use, and in the measuring mode, the thermocouple is welded into a point through the positive and negative couple wires at the measuring end, so that the thermocouple has the advantages of short thermal response time, large measuring range, long service life, reliable performance and the like, but has the defect of no high thermal resistance in precision. The thermal resistor is a resistance element passing through the measuring end, and has the advantages of high measuring precision and short thermal response time compared with a thermocouple. With the increasing improvement of digital monitoring requirements and safety requirements, temperature monitoring in important areas in the fields of chemical engineering, petrochemical industry, nuclear power and the like has extremely high requirements on the precision, performance and thermal response time of a temperature sensor, and single thermocouples or thermal resistors in some occasions cannot meet the requirements. There is therefore a need for a temperature sensor that combines the high accuracy of thermal resistors with the fast response function of thermocouples.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a quick-response temperature sensor consisting of two types of sensors so as to solve the problems in the prior art.

The utility model can be solved by the following technical scheme:

a fast reaction high precision temperature sensor comprises an intelligent secondary instrument and a small temperature measuring component, wherein the small temperature measuring component is assembled by two cathode thermocouple wires, a plurality of thermal resistance conductors, a thermal resistance element, a sleeve head, an armored thermocouple and a supporting sleeve, the two cathode thermocouple wires and the plurality of thermal resistance conductors are respectively penetrated into an insulator bead with a porous structure, the insulator bead, the two cathode thermocouple wires and the plurality of thermal resistance conductors are penetrated into a metal pipe to be manufactured into a special armor, one end of the special armor is stripped with a section of cathode thermocouple wire and a thermal resistance conductor, the plurality of thermal resistance conductors are welded with the thermal resistance element to form a thermal resistance, the two cathode thermocouple wires are welded with an anode thermocouple wire and a cathode thermocouple wire of the armored thermocouple, wherein the anode thermocouple wire of the armored thermocouple and the cathode thermocouple wire form a measuring point, the measuring point is consistent with the position height of the thermal resistance element, the sleeve head is welded with a special armor and is filled with an insulator, and the supporting sleeve penetrates through the armor thermocouple and is welded with the sleeve head and is sealed and welded with the armor thermocouple; and signals of the thermal resistor and the thermocouple are input into the intelligent secondary instrument.

Further, the armored thermocouple can be a K-type, N-type, T-type, E-type and J-type thermocouple graduation number.

Further, the number of the plurality of thermal resistance conductors can be two, three or four.

Furthermore, the intelligent secondary instrument can be a temperature transmitter, a signal collector or other integrated signal instruments, and is provided with a thermocouple and a thermal resistor dual-sensor signal which can be simultaneously input, and the signal output is the added value of a thermal resistor end and a thermocouple end.

The other solution of the scheme is that two anode thermocouple wires are welded with the anode thermocouple wire and the cathode thermocouple wire of the armored thermocouple, wherein the cathode thermocouple wire of the armored thermocouple and one cathode thermocouple wire form a measuring point (TC2), and the output signal of the intelligent secondary instrument is the subtraction value of the thermal resistance end and the thermocouple end.

The utility model has the beneficial effects that:

1. the temperature sensor has fast thermal response, the diameter of an end armored thermocouple (TC1) is smaller, the thermocouple TC2 located at the same position of a resistance element adopts reverse connection, when the temperature changes, the TC1 is a leakage end type structure and can preferentially feed back the temperature change, the output signal is TC1-TC2, the temperature of TC1-TC2 is superposed on the temperature of an RTD by combining the adding function of an intelligent secondary instrument, the fine change of the temperature can be fed back rapidly, the measurement mode can lead the end TC1 to preferentially feed back the temperature and superpose the temperature to the final output temperature when the medium temperature changes, and compared with the general thermal response time of the thermal resistance, the thermal response time is improved by more than 4 times.

2. The temperature sensor has high precision, although the temperature measurement principle of RTD + TC function is adopted, when the temperature sensing time of the sensor reaches stability, the temperature of TC1 and TC2 is synchronous, the temperature difference is 0, the TC action of the two parts is mutually offset, and the temperature measured by the RTD is finally output, so the precision is not influenced by a thermocouple.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic structural diagram of a small and medium-sized temperature measurement component in fig. 1.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

In the drawings

1, an intelligent secondary instrument; 2, a small temperature measuring component; 3, a negative thermocouple wire; 4, a thermal resistance conductor; 5, a resistive element; 6, sleeving a head; 7, an insulator; 8, sheathing a thermocouple; and 9, supporting the sleeve.

Detailed Description

Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, wherein the following description is given by way of illustration of specific embodiments of the utility model.

The utility model needs to combine the advantage of quick response of the thermocouple and the high-precision characteristic of the thermal resistor, designs a structure combining the thermocouple and the thermal resistor into a whole, and only outputs one signal value through a temperature transmitter or other secondary instruments.

As shown in fig. 2, the temperature sensor requires the integration of a thermal resistor and a plurality of thermocouples (typically two thermocouples) within a relatively small diameter sheath. The temperature measurement principle is as follows: the temperature measuring element is divided into two parts, wherein the first part is a measuring end of a thermocouple (TC1 for short) capable of rapidly inducing change; the second part is a thermal Resistor (RTD) and a compensation thermocouple (TC2), namely the structure of RTD + TC1+ TC2, wherein TC1 is reversely connected with TC 2. When the temperature changes rapidly, the first part TC1 (end) responds faster than the second part TC2, the output signals are RTD + TC1-TC2, when the temperature dynamic process is finished or changes very slowly, the TC1 and TC2 are synchronous, the temperature difference is 0, the TC actions of the two parts are mutually counteracted, namely TC1-TC2 is equal to 0, and finally the temperature measured by the RTD is displayed. Wherein TC1 and TC1 are output by the same group of signals.

As shown in fig. 1, 2 and 3, the high-low temperature loose core type temperature sensor of the utility model comprises an intelligent secondary instrument 1 and a small temperature measuring component 2. Wherein the small-sized temperature measuring component 2 is assembled by two cathode thermocouple wires 3, a plurality of thermal resistance conductors 4, a resistance element 5, a sleeve head 6, an insulator 7, an armored thermocouple 8(TC1) and a supporting sleeve 9, the two cathode thermocouple wires 3 and the plurality of thermal resistance conductors 4 are respectively penetrated into a bead of the insulator 7 with a porous structure, the bead of the insulator 7, the two cathode thermocouple wires 3 and the plurality of thermal resistance conductors 4 are penetrated into a metal pipe to form a special armor of a firm entity through multiple drawing and heat treatment, one end of the special armor is stripped out of a section of the cathode thermocouple wires 3 and the thermal resistance conductors 4, wherein the plurality of thermal resistance conductors 4 and the resistance element 5 are welded to form a thermal resistance, the two cathode thermocouple wires 3 are welded with the armored thermocouple 8, wherein the armored thermocouple 8 and one cathode thermocouple wire 3 form a measuring point, and the measuring point is consistent with the position of the resistance element 5, the sleeve head 6 is welded with a special armor and is filled with an insulator 7, the supporting sleeve 9 penetrates through the armored thermocouple 8 to be welded with the sleeve head 6 and is sealed and welded with the armored thermocouple 8, and finally the intelligent secondary instrument 1 is assembled and connected with a wire.

The armored thermocouple 8 can be insulated or connected with a shell, and the armored thermocouple 8 can be a K-type, N-type, T-type, E-type or J-type thermocouple division number.

Wherein, the number of the plurality of thermal resistance conductors 4 can be two, three or four.

The material of the insulator 7 may be magnesium oxide or aluminum oxide.

The intelligent secondary instrument 1 can be a temperature transmitter, a signal collector or other integrated signal instruments, and is provided with a thermocouple and a thermal resistor dual-sensor signal which can be simultaneously input, and the signal output is the added value of a thermal resistor end and a thermocouple end.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (4)

1. A fast reaction high precision temperature sensor is characterized by comprising an intelligent secondary instrument and a small temperature measuring component, wherein the small temperature measuring component is formed by assembling two cathode thermocouple wires, a plurality of thermal resistance conductors, a thermal resistance element, a sleeve head, an armored thermocouple and a supporting sleeve, the two cathode thermocouple wires and the plurality of thermal resistance conductors are respectively penetrated into an insulator bead with a porous structure, the insulator bead, the two cathode thermocouple wires and the plurality of thermal resistance conductors are penetrated into a metal pipe to be manufactured into a special armor, one end of the special armor is stripped to form a section of cathode thermocouple wire and a thermal resistance conductor, the plurality of thermal resistance conductors and the thermal resistance element are welded to form a thermal resistance, the two cathode thermocouple wires are welded with an anode thermocouple wire and a cathode thermocouple wire of the armored thermocouple, wherein the anode thermocouple wire and the cathode thermocouple wire of the armored thermocouple form a measuring point, the measuring point is consistent with the position height of the thermal resistance element, the sleeve head is welded with a special armor and is filled with an insulator, and the supporting sleeve penetrates through the armor thermocouple and is welded with the sleeve head and is sealed and welded with the armor thermocouple; and signals of the thermal resistor and the thermocouple are input into the intelligent secondary instrument.

2. The fast response high accuracy temperature sensor of claim 1, wherein said sheathed thermocouples are K-type, N-type, T-type, E-type, J-type thermocouple division numbers.

3. The fast response high accuracy temperature sensor of claim 1, wherein the number of said plurality of thermal resistance conductors is two, three, four.

4. The fast response high precision temperature sensor according to claim 1, wherein the intelligent secondary instrument is a temperature transmitter, a signal collector, and can simultaneously input signals of a thermocouple and a thermal resistor, and the signal output is the sum of a thermal resistor end and a thermocouple end.

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