High-temperature protection system based on thermocouple sealing cap

Abstract

The invention discloses a high-temperature protection system based on a thermocouple sealing cap, relates to the technical field of thermocouple sealing caps, and is based on a basic principle in a thermocouple operation process, firstly, a closed-loop circuit in a thermode assembly is subjected to structural optimization, specifically, a temperature control point for temperature compensation is additionally arranged in the closed-loop circuit, and the temperature control point is mainly used for changing a temperature difference value; and dynamic simulation actions are synchronously generated to execute two action modes, specifically, according to electromotive forces and detection temperatures under different temperature conditions, environmental fluctuation thresholds are gathered through grading analysis actions in a secondary analysis unit, and the environmental fluctuation thresholds and conversion factors under the two action modes are regenerated. And the environmental fluctuation and the conversion factor are compared and analyzed to generate an autonomous protection signal associated to the thermode assembly, so that the detection data deviation caused by the fact that the thermode assembly is continuously in a high-temperature operation state is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of thermocouple sealing caps, in particular to a high-temperature protection system based on a thermocouple sealing cap. BACKGROUND

[0002] A thermocouple is a temperature measuring device widely used in industrial production processes, and the working principle is based on the thermoelectric effect (Seebeck effect). The function of the thermocouple sealing cap is to protect the thermocouple core and prevent leakage. The thermocouple core is mainly composed of two metal conductors of different materials.

[0003] It should be noted that: any metal material will be damaged to varying degrees when continuously subjected to high temperature. For metal conductors used in thermocouples, the metal conductor in a high-temperature environment may lose its conductivity due to oxidation, or the growth of metal grains may cause thermoelectric potential drift. Such problems increase the response time and reduce stability, especially during actual operation, when the internal and external environmental temperature of the application site (device) fluctuates greatly, which directly affects the performance and accuracy of the thermocouple. Relying solely on the protection of the sealing cap cannot meet the stable operation requirements.

[0004] To this end, the application provides a solution. SUMMARY

[0005] The purpose of the application is to provide a high-temperature protection system based on a thermocouple sealing cap. The use principle of the thermocouple is that the performance of the metal conductor is directly related to the temperature, but temperature is the only factor in the operation process of the metal conductor. In particular, on the basis of large temperature / temperature difference fluctuations, the damage to the metal conductor in the thermocouple core is accelerated, directly affecting the performance and parameter accuracy during the operation of the thermocouple.

[0006] The purpose of the application can be achieved by the following technical solution: a high-temperature protection system based on a thermocouple sealing cap, applied in a thermocouple, the thermocouple consisting of a terminal assembly, a protective sleeve and a thermoelectric electrode assembly, the high-temperature protection system consisting of a data integration unit, an environmental simulation action unit, a secondary analysis unit and an interaction unit, the data integration unit being used to record the action data of the thermoelectric electrode assembly.

[0007] Based on the action data in the thermoelectric electrode assembly, the environmental simulation action unit generates dynamic simulation actions, and in the dynamic simulation actions, an environmental fluctuation threshold is generated and input again into the data integration unit for storage;

[0008] The secondary analysis unit performs hierarchical analysis actions based on the environmental fluctuation threshold and the action data, and obtains a conversion factor in the thermoelectric electrode assembly based on the environmental fluctuation threshold and the action data in the hierarchical analysis actions;

[0009] The interaction unit generates an autonomous protection signal for the hot electrode assembly based on the dynamic simulation action and the hierarchical analysis action, and the interaction unit actively protects the hot electrode assembly with the autonomous signal protection signal.

[0010] Further, the hot electrode assembly is provided with a closed loop circuit, which includes the first wire, the second wire and the detection unit, and the intersection of the first wire and the second wire is set as a temperature measurement point, and the other intersection of the first wire and the second wire is set as a temperature control point.

[0011] Further, the action data is represented as the detection temperature value during normal operation of the thermocouple, and is set as T mc , and the basic calculation mode associated with the detection temperature value is set by the secondary analysis unit as follows: Ea=(T mc -T o )*A r , wherein Ea, T o and A r represent the electromotive force obtained by the detection unit, the initial temperature in the hot electrode assembly and the temperature coefficient in the hot electrode assembly, respectively, and the initial temperature T o is set as a variable value.

[0012] Further, the environmental simulation action unit is provided with the following two action modes:

[0013] Action mode one: the initial temperature in the hot electrode assembly is kept as a constant value;

[0014] Action mode two: in the action simulation action, the positive variable associated with the initial temperature is set as T i , and the calculation mode of the detection temperature value is optimized as follows: Ea=(T md -T o -T i )*A r , and in the dynamic simulation action, (T o +T i )<T mc , wherein T md is a variable value of the detection temperature value in the action mode one.

[0015] Further, in the environmental simulation action unit, an upper limit peak value T mc associated with T max is set again, which represents only the upper limit of the specification during operation of the hot electrode assembly, but not the damaged upper limit in the hot electrode assembly, and the upper limit peak value T max is sent to the secondary analysis unit.

[0016] Further settings: Combine dynamic simulation analysis actions with the following settings for hierarchical analysis actions:

[0017] S1: The T calculated in Action Mode 1 mc With upper limit peak T max Prioritize comparisons and set T based on the specifications of the thermoelectric electrode assembly. mc With upper limit peak T max The maximum span A between them, 0 < A < 1, if T mc <A*T max Then the environmental simulation action unit, secondary analysis unit and interaction unit are all in a non-operating state, while the thermoelectric assembly operates normally;

[0018] S2: When A*T max <T mc And further subdivided into A*T max <T mc <T max and T mc >T max Two states are defined, and these two states are set as high temperature state and over-temperature state respectively. Then, according to action mode two, Ea=(T md -T o -T i )*A r The calculation method is as follows:

[0019] When A*T max <T mc <T ma The temperature control point in the thermoelectric electrode assembly is actively heated to T. o +T i The analysis and comparison of action mode one and action mode one were performed using an equivalent conversion method: (T mc -T o )*A r >(T md -T o -T i )*A r Let XT represent the environmental fluctuation threshold, XT=(T mc -T o ) / (T md -T o -T i And set the environmental fluctuation threshold under high temperature conditions to XT. a ;

[0020] When T mc >T max This indicates that the thermoelectric assembly is in an over-temperature state, and the environmental fluctuation threshold is directly expressed as (T). mc -T o )*Ar (T md -T o -T i )*Ar, and set the environmental fluctuation threshold XT b in the over-temperature state to T i , and combine the over-temperature state and the high-temperature state to continue the positive variable T o of the temperature compensation process of the temperature control point position twice or more than twice, and the temperature control point temperature is represented as: T i + T o + 2*T i … T o +i*T i , where i is an integer greater than 1, and a plurality of corresponding XT b is obtained in this way.

[0021] Further set: generate an autonomous protection signal according to the environmental fluctuation thresholds XT a and XT b in the high-temperature state and the over-temperature state, calculate XT o and XT i in the high-temperature state and the over-temperature state with T a + T b , and represent the conversion factor as YT, YT=XT a -XT b , or in the over-temperature state, a plurality of XT o is obtained according to the above T i + T o , T i + 2*T o … T i +i*T b , and the conversion factor is calculated by the difference between the plurality of XT b , and when YT is greater than XT, it indicates that the thermoelectric element assembly is in a high-temperature damaged state and generates an autonomous protection signal.

[0022] The present application has the following advantages:

[0023] 1. The operating principle of the conventional thermocouple is described: first, the closed loop circuit in the conventional thermoelectric element assembly is improved and optimized, specifically, one of the region positions is set as a temperature control point, the temperature control point does not actively participate in the working mode of the thermocouple, but as a temperature compensation means in the thermocouple self-checking process, its essence is to change the temperature difference value through dynamic simulation action, to obtain electromotive force and detection temperature under different temperature conditions, and its essence belongs to a self-checking protection mode for the thermocouple.

[0024] 2, It is explained again in combination with the above that: the dynamic simulation action has two action modes, and corresponding specific parameters are obtained in the two action modes, specifically including an environmental fluctuation threshold and a conversion factor, the essence of which is to calculate the parameters of the hierarchical analysis action set in the secondary analysis unit, and to compare and analyze the environmental fluctuation and the conversion factor to generate an independent protection signal associated with the thermocouple assembly, the purpose of which is to avoid the thermocouple assembly continuously operating at high temperature to cause detection data deviation. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The structure diagram of the thermocouple in the high-temperature protection system based on the thermocouple sealing cap proposed by the present application;

[0027] Figure 2 The local cutaway view of the thermocouple in the high-temperature protection system based on the thermocouple sealing cap proposed by the present application;

[0028] Figure 3 The conductor connection diagram in the high-temperature protection system based on the thermocouple sealing cap proposed by the present application;

[0029] Figure 4 The operation block diagram of the high-temperature protection system based on the thermocouple sealing cap proposed by the present application.

[0030] In the figure: 1, terminal assembly; 2, protective sleeve; 3, thermocouple assembly. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Embodiment one: The use process of the thermocouple is explained as follows: there is a direct relationship between the use performance of the metal conductor and the temperature, but temperature is the only factor in the operation process of the metal conductor, especially on the basis of large temperature / temperature difference fluctuation, which accelerates the damage of the metal conductor in the thermocouple core, directly affecting the performance and parameter accuracy in the operation process of the thermocouple. For this, the following technical description is proposed:

[0033] Reference Figures 1-4 The high-temperature protection system based on thermocouple sealing cap in this embodiment is applied in thermocouples. The thermocouple is composed of terminal assembly 1, protective sleeve 2 and thermoelectrode assembly 3. The high-temperature protection system consists of data integration unit, environmental simulation action unit, secondary analysis unit and interaction unit. The data integration unit is used to record the action data of thermoelectrode assembly 3.

[0034] Based on the motion data in the thermoelectric assembly 3, dynamic simulation motion is generated for the environmental simulation motion unit. In the dynamic simulation motion, an environmental fluctuation threshold is generated and then input into the data integration unit for storage.

[0035] The secondary analysis unit performs hierarchical analysis of actions based on environmental fluctuation thresholds and action data. In the hierarchical analysis of actions, the conversion factor in the thermoelectric assembly 3 is obtained based on the environmental fluctuation thresholds and action data.

[0036] The interactive unit generates an autonomous protection signal for the thermoelectrode assembly 3 based on dynamic simulation actions and hierarchical analysis actions, and the interactive unit actively protects the thermoelectrode assembly 3 with the autonomous protection signal.

[0037] Working principle: The present invention Figure 1 and Figure 2 This section primarily provides a simple explanation of the conventional thermocouple structure. Essentially, it utilizes the principle of heat conduction; heat from the measured area is transferred to the thermoelectric assembly 3. The fundamental principle of the thermoelectric assembly 3 lies in the thermoelectric effect. Figure 3 Taking the closed-loop circuit in the example, wire one and wire two represent two different metal conductors that are connected to the detection unit in a closed loop. The detection unit can be represented as an instrument for detecting thermoelectric potential. The temperature measuring point mainly represents the position in the overall thermocouple that directly contacts the area to be measured. It can be understood that the temperature measuring point is located at the intersection of wire one and wire two. Therefore, after the heat in the area to be measured is "received" at the temperature measuring point, electron diffusion occurs and a current is formed. This part is the basic principle of thermocouple.

[0038] In the present embodiment, the temperature control point is added to the environmental simulation action unit in the high temperature protection system. The temperature control point represents the position of the intersection of the second wire and the first wire. In theory, the temperature of the intersection position is only related to the environmental temperature. In the present embodiment, the heating structure is added to the intersection position to actively increase the temperature of the region. The temperature sensor is used to detect the temperature value of the region at the temperature control point, so as to further simulate the temperature with different temperature differences. The environmental simulation action unit actively simulates the temperature with different temperature differences, and is mainly a "compensation means" for the thermocouple assembly 3.

[0039] Embodiment two: the high temperature protection system in embodiment one is described as follows:

[0040] As shown in embodiment one, the action data generated during the normal operation of the thermocouple mainly represents the detection temperature value, which is set as T mc , and the basic calculation method associated with the detection temperature value is set by the secondary analysis unit as follows: Ea=(T mc -T o )*A r , wherein Ea, T o and A r represent the electromotive force obtained by the detection unit, the temperature initial value in the thermocouple assembly 3 and the temperature coefficient in the thermocouple assembly 3, respectively. The temperature initial value is set as a variable value, and the environmental simulation action unit is set as follows:

[0041] Action mode one: the temperature initial value in the thermocouple assembly 3 is kept as a constant value;

[0042] Action mode two: associated with the dynamic simulation action, the positive variable associated with the temperature initial value in the action simulation action is set as T i , so in the present mode, the calculation method of the detection temperature value is optimized as follows: Ea=(T md -T o -T i )*A r , and in the dynamic simulation action, (T o +T i )<T mc , wherein T md is the variable value of the detection temperature value in the action mode one, and the environmental fluctuation threshold value represents the ratio between T md and T mc .

[0043] It should be noted that in the action mode two, the environmental simulation action unit is further set as follows: mcthe upper limit peak T max The upper limit peak only represents the upper limit of the specification during the operation of the thermoelectric electrode assembly 3, and does not represent the damaged upper limit in the thermoelectric electrode assembly 3. It can be understood that when the detection value reaches the upper limit peak, the thermoelectric electrode assembly 3 can still operate, but its performance will decrease, and the upper limit peak T max is sent to the secondary analysis unit.

[0044] Embodiment three: This embodiment is a supplementary description of the grading analysis action combined with dynamic simulation action as follows:

[0045] S1: The T mc calculated in action mode one is compared with the upper limit peak T max in priority, and the maximum span A, 0 mc between the upper limit peak T max and the specification setting T mc of the thermoelectric electrode assembly 3, 0 max , if T max <A*T mc , the environmental simulation action unit, the secondary analysis unit and the interaction unit are in a non-operating state, and the thermoelectric electrode assembly 3 operates normally.

[0046] S2: When A*T max <T mc <T max and T mc >T max , two states are further subdivided, and the two states are set as high temperature state and over-temperature state respectively, then according to the calculation method of Ea=(T md -T o -T i )*A r in action mode two, and as follows:

[0047] When A*T max <T mc <T ma , the temperature of the temperature control point in the thermoelectric electrode assembly 3 is actively increased to T o +T i , and it should be noted that T mc is calculated by the calculation method in action mode one, and after active heating, the temperature of the temperature measuring point in the thermoelectric electrode assembly 3 does not change in theory, and because the temperature of the temperature measuring point can be represented by T mc , but because the temperature of the temperature control point changes, the final obtained electromotive force exists in a state of obvious decrease, and the action mode one and the action mode are analyzed and compared by equivalent conversion method: (T mc -T o )*A r>(T md -T o -T i )*A r , and in the high temperature state, it indicates that the thermoelectric assembly 3 is not in the upper limit of damage, so that A r is set in it mc is a relative constant state, so XT is used to represent the environmental fluctuation threshold, XT=(T o -T md ) / (T o -T i ), and it needs to be explained that because the temperature of the measurement point area is calculated by the electromotive force, the specific value of the electromotive force can be obtained in both action mode one and action mode two, so the environmental fluctuation threshold can be calculated in real time, so the ratio between T md and T mc can be further obtained, and the environmental fluctuation threshold in the high temperature state is set as XT a ;

[0048] When T mc >T max , it indicates that the thermoelectric assembly 3 is in an over-temperature state, and in this state, A r in it changes slightly due to the influence of the temperature environment, but the temperature of the measurement point area can still be calculated by the electromotive force. The only difference is that due to the change of A r , the calculation results of (T mc -T o )*A r and (T md -T o -T i )*A r are quite different from the above content, so when T mc >T max , the environmental fluctuation threshold in it is directly represented as (T mc -T o )*A r / (T md -T o -T i )*Ar, and the environmental fluctuation threshold in the over-temperature state is set as XT b ;

[0049] In combination with the over-temperature state and the high temperature state, the temperature compensation process of the control temperature point position is continued twice or more than twice with a positive variable T i , and the control temperature point temperature is represented as: T o +T i , T o +2*T i …To + i * T i , wherein i is an integer greater than 1, a plurality of corresponding XT b are obtained in this way

[0050] Then in the interaction unit, according to the environmental fluctuation threshold XT a and XT b in the high-temperature state and the over-temperature state, the autonomous protection signal is generated, which is specifically manifested as: XT o + XT i is calculated to obtain XT a and XT b in the high-temperature state and the over-temperature state, and YT represents the conversion factor, YT = XT a - XT b , or in the over-temperature state, a plurality of XT o are obtained according to T i + T o + 2 * T i … T o + i * T i , and the conversion factor is calculated according to the difference of the plurality of XT b , when YT is greater than XT b , it indicates that the thermocouple assembly 3 is in a high-temperature damaged state and generates an autonomous protection signal, and in the active protection action, the closed loop circuit in the thermocouple assembly 3 is cut off to achieve the purpose of protecting the thermocouple assembly 3.

[0051] As shown above: based on the basic principle in the operation process of the thermocouple, first, the closed loop circuit in the thermocouple assembly is structurally optimized, specifically, a temperature control point for temperature compensation is added therein, which is mainly used to change the temperature difference value, and simultaneously generates a dynamic simulation action to execute two action modes, specifically, according to the electromotive force and the detected temperature under different temperature conditions, the environmental fluctuation threshold is collected again through the secondary analysis action in the secondary analysis unit, and the environmental fluctuation threshold and the conversion factor in the two action modes are generated again, and the environmental fluctuation and the conversion factor are compared and analyzed to generate the autonomous protection signal related to the thermocouple assembly, the purpose of which is to avoid the thermocouple assembly continuously in a high-temperature operating state to cause the detection data deviation.

[0052] The above content is only an example and description of the structure of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the invention or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

[0053] In the description of the application, references to "one embodiment", "an example", "certain examples" etc. mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example", "certain examples" etc. in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0054] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments do not describe all of the details of the application and limit the application to the specific embodiments. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of and practical application of the application to those skilled in the art. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A high temperature protection system based on thermocouple seal caps, characterized in that, The application is applied to a thermocouple composed of a terminal assembly (1), a protective sleeve (2) and a thermocouple assembly (3), and the high-temperature protection system is composed of a data integration unit, an environment simulation action unit, a secondary analysis unit and an interaction unit, and the data integration unit is used for recording the action data of the thermocouple assembly (3); The environment simulation action unit generates a dynamic simulation action based on the action data in the thermocouple assembly (3), generates an environment fluctuation threshold in the dynamic simulation action, and inputs the environment fluctuation threshold into the data integration unit again for storage; The secondary analysis unit performs hierarchical analysis actions based on the environment fluctuation threshold and the action data, and obtains a conversion factor in the thermocouple assembly (3) based on the environment fluctuation threshold and the action data in the hierarchical analysis actions; The interaction unit generates an autonomous protection signal for the thermocouple assembly (3) based on the dynamic simulation action and the hierarchical analysis action, and the interaction unit actively protects the thermocouple assembly (3) based on the autonomous signal protection signal.

2. The thermocouple capsule based high temperature protection system of claim 1, wherein, A closed loop circuit is arranged in the thermocouple assembly (3), and the closed loop circuit includes a wire one, a wire two and a detection unit, a position corresponding to an intersection of one of the wire one and the wire two is taken as a temperature measurement point, and a position corresponding to an intersection of the other of the wire one and the wire two is taken as a temperature control point.

3. The thermocouple capsule based high temperature protection system of claim 1, wherein, The action data is represented as the detected temperature value during normal operation of the thermocouple and is set as T mc , and the basic calculation mode associated to the detected temperature value is set by the secondary analysis unit as: Ea = (T mc -T o )*A r , wherein Ea, T o , and A r respectively represent the electromotive force obtained by the detection unit, the temperature initial value in the thermocouple assembly (3), and the temperature coefficient in the thermocouple assembly (3), wherein the temperature initial value T o is set as a variable value.

4. The thermocouple capsule based high temperature protection system of claim 3, wherein, The environment simulation action unit is set as follows: Action mode one: the temperature initial value in the thermocouple assembly (3) is kept as a constant value; Action mode two: in the action simulation action, the positive variable setting associated to the temperature initial value is set to T i and the calculation of the detected temperature value is optimized to Ea=(T md -T o -T i )*A r , and in the dynamic simulation action, (T o +T i )<T mc , where T md belongs to the variable value of the detected temperature value in action mode one.

5. The thermocouple capsule based high temperature protection system of claim 4, wherein, In the environment simulation action unit, re-set the association with T. mc Upper limit peak T max The upper limit peak value only represents the upper limit of the specifications of the hot electrode assembly (3) during operation, and does not represent the upper limit of damage in the hot electrode assembly (3). The upper limit peak value T max Send it to the secondary analysis unit.

6. The thermocouple capsule based high temperature protection system of claim 5, wherein, The following contents are set for the hierarchical analysis action in combination with the dynamic simulation analysis action: S1: The T calculated in Action Mode 1 mc With upper limit peak T max Priority comparisons were made, and T was set according to the specifications of the thermoelectric assembly (3). mc With upper limit peak T max The maximum span A between them, 0 < A < 1, if T mc <A*T max Then the environmental simulation action unit, secondary analysis unit and interaction unit are all in a non-operating state, and the thermoelectric assembly (3) is operating normally; S2: when A*T max <T mc and A*T max <T mc <T max and T mc >T max two states, and set the two states as high temperature state and over temperature state respectively, then according to the calculation mode of Ea=(T md -T o -T i )*A r , and as follows: When A*T max <T mc <T ma , the temperature control point in the hot electrode assembly (3) is actively heated to T o +T i , the action mode one and the action mode are analyzed and compared by equivalent conversion: (T mc -T o )*A r >(T md -T o -T i )*A r , the environmental fluctuation threshold is represented by XT, XT=(T mc -T o ) / (T md -T o -T i ), and the environmental fluctuation threshold in the high temperature state is set as XT a ; When T mc > T max , it indicates that the thermode assembly (3) is in an over-temperature state, and the ambient fluctuation threshold is directly represented as (T mc -T o )*A r / (T md -T o -T i )*Ar, and the ambient fluctuation threshold in the over-temperature state is set as XT b , and combined with the over-temperature state and the high-temperature state, the temperature compensation process of the control temperature point position is continued twice or more than twice with a positive variable T i , and the control temperature point temperatures are respectively represented as: T o +T i , T o +2*T i …T o +i*T i , wherein i is an integer greater than 1, and a plurality of corresponding XT b are obtained in this way.

7. The thermocouple capsule based high temperature protection system of claim 6, wherein, In the interactive unit, the environmental fluctuation threshold XT under high temperature and over-temperature conditions is used. a and XT b Generate autonomous protection signal, in T o +T i XT was calculated under high temperature and over-temperature conditions. a and XT b And let YT represent the conversion factor, YT=XT a -XT b Or, under conditions of excessive temperature, according to the above-mentioned T o +T i T o +2*T i …T o +i*T i Get multiple XT b and with multiple XT b The difference is calculated to obtain the conversion factor. When YT is greater than XT, it indicates that the thermal electrode assembly (3) is in a high-temperature damaged state and generates an autonomous protection signal.

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