CN104807553A

CN104807553A - Self-diagnosis thermocouple

Info

Publication number: CN104807553A
Application number: CN201510164066.9A
Authority: CN
Inventors: 孙磊; 罗广帝
Original assignee: NINGBO AUQI INSTRUMENT COMPLETE EQUIPMENT Co Ltd
Current assignee: NINGBO AUQI INSTRUMENT COMPLETE EQUIPMENT Co Ltd
Priority date: 2015-04-08
Filing date: 2015-04-08
Publication date: 2015-07-29

Abstract

The invention discloses a self-diagnosis thermocouple. The self-diagnosis thermocouple is that a positive electrode and a negative electrode form a closed loop; a common electrode which is a conductor different from the positive electrode and the negative electrode is connected to a measuring end combining point of the positive electrode and the negative electrode; the common electrode, the positive electrode and the negative electrode respectively form closed loops; each loop is connected with a transmitter; the transmitters are used for converting thermoelectric potential in the loops into temperature values to be inputted to a processor; the processor analyzes and calculates the temperature values and then displays the result through a display; the processor is also connected with an alarm; the processor is used for comparing the measuring values of the three loops; if the measuring values of the three loops are different, the electrode is degraded; the processor can output difference value; if the difference value exceeds the preset range, the failure of the thermocouple can be determined, and therefore, the online real-time detection can be achieved.

Description

Self diagnosis thermopair

Technical field

The present invention relates to thermopair, particularly relate to the thermopair can diagnosed voluntarily and whether deterioration occurs.

Background technology

Thermopair is temperature element conventional in temperature measuring instrument, be bonded into loop by the conductor two ends of two kinds of heterogeneities, when the temperature at two abutments is different, will electromotive force be produced in the loop, this phenomenon is called thermoelectric effect, and this electromotive force is called thermoelectrical potential.It is thermometric that thermopair utilizes this principle to carry out exactly.Because thermopair is made up of metal or alloy, this just determines at high temperature internal grain can slowly become large.Be exactly that its position or shape also will change, and also will react to the reduction in surrounding environment or oxidizing gas containing a small amount of impurity in alloy in addition.With above-mentioned change, extremely responsive also changes by the thermoelectrical potential of thermopair, cause the aged deterioration of thermopair, and this degradation phenomena is inevitable.The deterioration of thermopair is a quantitative change process, quantitatively very difficult to it, the Zhong Lei ﹑ Zhi Jing ﹑ with thermopair is used the difference of Wen Du ﹑ Qi Fen ﹑ time and changes.

The acceptable criterion of thermopair refers to whether thermopair degradation exceedes permissible error; and existing thermopair in working order in be cannot judge whether qualified; it is qualified to carry out judging whether after sending control laboratory to test after only pulling down equipment, thus makes equipment downtime blowing out cause waste.If deterioration failure occurs for the thermopair that runs just in a device, the Thermocouple Temperature Signal of mistake can cause the accident hidden danger.

Summary of the invention

Technical matters to be solved by this invention be overcome prior art above-mentioned deficiency and a kind of self diagnosis thermopair is provided, in a state of use, thermopair can be monitored constantly whether deterioration and degradation occur.

The present invention's adopted technical scheme that solves the problem is: self diagnosis thermopair, the positive pole of thermopair, negative pole composition closed-loop path, the measuring junction binding site of positive pole, negative pole is connected with utility pole, utility pole is the conductor different from positive pole, negative pole, utility pole and positive pole, negative pole form closed-loop path respectively, connect transmitter in each loop, the thermoelectrical potential in loop is converted to temperature value and input processor by transmitter, and processor analytical calculation temperature value shows result by display again.

Described processor also connects attention device.

Compared with prior art, the invention has the advantages that: measuring junction binding site increases utility pole, form three closed-loop paths, be converted to temperature value by transmitters sense thermoelectrical potential, processor compares the measured value in three loops, if three's difference illustrates that deterioration occurs electrode wherein, processor is exportable difference size also, when difference exceedes default scope, can judge that thermopair lost efficacy, can realize like this detecting constantly online, detection need not be pulled down from equipment, cut the waste, monitor the state of thermopair in equipment running process at any time, prevent because thermopair lost efficacy and have an accident.Also than adopting a pair mode for subsequent use to save cost and space.

Accompanying drawing explanation

Fig. 1 is the structural representation of thermopair one end in the embodiment of the present invention.

Fig. 2 is the cross sectional representation of Fig. 1.

Fig. 3 is the theory diagram that the present invention carries out self diagnosis.

Embodiment

Below in conjunction with accompanying drawing, embodiment, the present invention is further described.

Embodiment, as one end of the self diagnosis thermopair of Fig. 1, cross section structure as shown in Figure 2, thermopair outer cover has metal epitheca 1, filling material 6 is filled in metal epitheca 1 inside, filling material 5 is magnesia powder or alumina powder, filling material 6 is coated with the electrode that three unlike material conductors are made, positive pole 2 respectively, negative pole 3, utility pole 4, the left end of three electrodes connects, form measuring junction 5, the right-hand member of three electrodes is reference end, three electrode right-hand members are also connected to each other and form loop, namely positive pole 2 forms loop with negative pole 3 is closed, positive pole 2 forms loop with utility pole 4 is closed, negative pole 3 forms loop with utility pole 4 is closed.All transmitter is connected with in each loop, transmitter is connected with processor, and when measuring junction 5 exists temperature difference with reference end, transmitters sense is to the thermoelectrical potential in loop and be converted to temperature value, and detection data are sent to processor, processor is connected with display, attention device.

Its principle of work block diagram as shown in Figure 3, KP, KN, Pt is electrically connected positive pole 2 respectively, negative pole 3, utility pole 4, transmitter A is connected to KP, in the loop that KN is formed, transmitter B is connected to KP, in the loop that Pt is formed, transmitter C is connected to KN, in the loop that Pt is formed, be equivalent to define three groups of thermocouple measurement loops, each transmitter is connected with processor, during thermometric, three transmitters can record three thermoelectrical potential data, and thermoelectrical potential data are converted to temperature value, be sent to processor, processor can compare three temperature values, if three temperature values are identical, illustrate that thermocouple probes does not have deterioration or degradation not to affect thermoelectrical potential, if three temperature value differences, illustrate that the electrode in thermopair there occurs deterioration.Processor can by the difference size between three temperature values, three temperature values, export display to, when the difference that any two record temperature is greater than a certain preset value, processor is blown a whistle by attention device and is represented that thermopair lost efficacy, by display display thermopair degradation, end user is caused to note.Complete the self diagnosis of thermopair whether deterioration, degradation like this.

Claims

1. self diagnosis thermopair, the positive pole of thermopair, negative pole composition closed-loop path, it is characterized in that: the measuring junction binding site of positive pole, negative pole is connected with utility pole, utility pole is the conductor different from positive pole, negative pole, utility pole and positive pole, negative pole form closed-loop path respectively, connect transmitter in each loop, the thermoelectrical potential in loop is converted to temperature value and input processor by transmitter, and processor analytical calculation temperature value shows result by display again.

2. self diagnosis thermopair according to claim 1, is characterized in that: described processor also connects attention device.