Temperature measuring device

Abstract

The invention provides a temperature measuring device which can be applied to the technical field of temperature measurement. The temperature measuring device comprises: a thermocouple detecting a measured temperature at a surface of a target rotating member; the first end of the rotor-stator signal converter is electrically connected with the reference end of the thermocouple; the first thermal resistor is configured to detect a first reference temperature at the first end of the rotor-stator converter; the second thermal resistor is configured to detect a second reference temperature at the second end of the rotor-stator converter; the data acquisition instrument acquires a measurement electric signal corresponding to the thermocouple, a first reference electric signal corresponding to the first thermal resistor and a second reference electric signal corresponding to the second thermal resistor under the condition that the target rotating part rotates; and a processor configured to determine a measurement temperature, a first reference temperature and a second reference temperature based on the measurement electric signal, the first reference electric signal and the second reference electric signal, and determine a first surface temperature of the target rotating member according to the measurement temperature, the first reference temperature and the second reference temperature.

Description

Technical Field

[0001] The present disclosure relates to the technical field of temperature measurement, and more particularly, to a temperature measurement device. Background Art

[0002] In the field of rotational temperature measurement technology, there is a large demand for temperature testing of a large number of rotating components. When using a thermocouple to measure the temperature of a rotating component, the thermocouple needs to be connected to a rotor-stator signal converter, and the electrical signal measured by the thermocouple is transmitted to a data acquisition instrument through the rotor-stator signal converter.

[0003] However, in the process of transmitting the electrical signal measured by the thermocouple to the data acquisition instrument by using the rotor-stator signal converter, the rotor-stator signal converter is affected by the change of the ambient temperature and introduces errors into the transmitted electrical signal, thereby reducing the accuracy of the temperature corresponding to the electrical signal. Summary of the Invention

[0004] In view of this, the present disclosure provides a temperature measurement device.

[0005] According to one aspect of the present disclosure, there is provided a temperature measurement device including: a thermocouple disposed on the surface of a target rotating component and configured to detect a measured temperature at the surface of the target rotating component; a rotor-stator signal converter, a first end of the rotor-stator signal converter being electrically connected to a reference end of the thermocouple; a first thermal resistor disposed at the first end of the rotor-stator signal converter, the first thermal resistor being configured to detect a first reference temperature at the first end of the rotor-stator converter; a second thermal resistor disposed at a second end of the rotor-stator signal converter, the second thermal resistor being configured to detect a second reference temperature at the second end of the rotor-stator converter; a data acquisition instrument electrically connected to the second end of the rotor-stator signal converter, the first thermal resistor, and the second thermal resistor, the data acquisition instrument being configured to collect a measured electrical signal corresponding to the thermocouple, a first reference electrical signal corresponding to the first thermal resistor, and a second reference electrical signal corresponding to the second thermal resistor when the target rotating component is rotating; a processor configured to determine the measured temperature, the first reference temperature, and the second reference temperature based on the measured electrical signal, the first reference electrical signal, and the second reference electrical signal, and determine a first surface temperature of the target rotating component according to the measured temperature, the first reference temperature, and the second reference temperature.

[0006] For example, the rotor-stator signal converter includes: a rotor structure connected to the target rotating component, a first end of the rotor structure being electrically connected to the thermocouple; a stator structure, a first end of the stator structure being electrically connected to a second end of the rotor structure, a second end of the stator structure being electrically connected to the data acquisition instrument, wherein the stator structure is fixed when the target rotating component is rotating.

[0007] For example, determining the first surface temperature of the target rotating part based on the measured temperature, the first reference temperature, and the second reference temperature includes: determining a temperature difference based on the first reference temperature and the second reference temperature; and when the temperature difference is less than a first preset threshold, determining the measured temperature as the first surface temperature.

[0008] For example, determining the first surface temperature of the target rotating part based on the measured temperature, the first reference temperature, and the second reference temperature further includes: when the temperature difference is greater than or equal to the first preset threshold, compensating the measured temperature based on the first reference temperature and the second reference temperature to obtain the first surface temperature.

[0009] For example, the processor is further configured to: when the number of the thermocouples is multiple, calculate a standard deviation of multiple first surface temperatures respectively corresponding to the multiple thermocouples; and when the standard deviation is less than a second preset threshold, perform a weighted sum of the multiple first surface temperatures respectively corresponding to the multiple thermocouples to obtain a target surface temperature.

[0010] For example, the number of the first thermal resistors is multiple, and the multiple first thermal resistors are respectively arranged on circumferences with different radii centered at the center of the end face of the first end of the stator-rotor signal converter; the number of the second thermal resistors is multiple, and the positions of the multiple second thermal resistors at the second end are symmetrically arranged with the positions of the multiple first thermal resistors at the first end;

[0011] The processor is further configured to: when the standard deviation is greater than or equal to the second preset threshold, determine at least one first target thermocouple from the multiple thermocouples, where the absolute value of the difference between the first surface temperature and the average temperature respectively corresponding to each of the at least one first target thermocouple is greater than a difference threshold, and the average temperature is obtained by calculating the average value of the multiple first surface temperatures corresponding to the multiple thermocouples;

[0012] For each first target thermocouple, determine a target port at the first end of the stator-rotor signal converter connected to the first target thermocouple;

[0013] Determine at least two target first thermal resistors close to the target port from the multiple first thermal resistors;

[0014] Compensate the measured temperature of the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to the at least two target first thermal resistors and at least two second reference temperatures corresponding to the at least two target second thermal resistors, to obtain the second surface temperature of the target rotating member, wherein the positions of the at least two target second thermal resistors at the second end are symmetrically arranged with respect to the positions of the at least two target first thermal resistors at the first end;

[0015] Perform weighted summation on at least one second surface temperature corresponding to the at least one first target thermocouple and at least one first surface temperature corresponding to the at least one second target thermocouple, to obtain the target surface temperature, wherein the absolute value of the difference between the first surface temperature corresponding to each of the at least one second target thermocouple and the average temperature is less than or equal to the difference threshold.

[0016] For example, the above-mentioned compensating the measured temperature of the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to the at least two target first thermal resistors and at least two second reference temperatures corresponding to the at least two target second thermal resistors, to obtain the second surface temperature of the target rotating member includes: calculating the average value of at least two first reference temperatures corresponding to the at least two target first thermal resistors, to obtain the average first reference temperature; calculating the average value of at least two second reference temperatures corresponding to the at least two target second thermal resistors, to obtain the average second reference temperature; compensating the measured temperature of the first target thermocouple connected to the target port according to the average first reference temperature and the average second reference temperature, to obtain the second surface temperature of the target rotating member.

[0017] For example, the above-mentioned processor is further configured to: determine a first expanded uncertainty corresponding to the thermocouple according to the target surface temperature and a calibration table corresponding to the thermocouple; determine a second expanded uncertainty corresponding to the plurality of first thermal resistors according to a plurality of first reference temperatures corresponding to the plurality of first thermal resistors and a calibration table corresponding to the plurality of first thermal resistors; determine a third expanded uncertainty corresponding to the data collector according to a calibration table corresponding to the data collector; determine the expanded uncertainty of the target surface temperature according to the first expanded uncertainty, the second expanded uncertainty, the third expanded uncertainty and a predetermined uncertainty formula.

[0018] For example, the first end of the above-mentioned stator-rotor signal converter is electrically connected to the reference end of the thermocouple based on a first wire, the second end of the stator-rotor signal converter is electrically connected to the data collector based on a second wire, and the materials of the first wire and the second wire are the same as the material of the reference end of the thermocouple.

[0019] For example, in the case where the above-mentioned target rotating member is a rotating disk, the above-mentioned first wire is connected to the first end of the rotor-stator signal converter via the axial hole of the rotating disk.

[0020] According to an embodiment of the present disclosure, when detecting the measured temperature at the surface of the target rotating member using a thermocouple and electrically connecting the first end of the rotor-stator signal converter to the reference end of the thermocouple, by detecting the first reference temperature at the first end of the rotor-stator converter using a first thermal resistor and detecting the second reference temperature at the second end of the rotor-stator converter using a second thermal resistor, it is possible to collect, when the data acquisition instrument is in the case of the target rotating member rotating, the measured electrical signal corresponding to the thermocouple, the first reference electrical signal corresponding to the first thermal resistor, and the second reference electrical signal corresponding to the second thermal resistor, and then use a processor to determine the measured temperature, the first reference temperature, and the second reference temperature based on the measured electrical signal, the first reference electrical signal, and the second reference electrical signal, and determine the first surface temperature of the target rotating member according to the measured temperature, the first reference temperature, and the second reference temperature, so as to realize environmental temperature difference compensation for the measured temperature according to the reference temperatures at both ends of the rotor-stator converter and improve the accuracy of the obtained first surface temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Through the following description of the embodiments of the present disclosure with reference to the drawings, the above and other objects, features, and advantages of the present disclosure will become clearer. In the drawings:

[0022] Figure 1 Schematically shows a structural diagram of a temperature measurement device according to an embodiment of the present disclosure;

[0023] Figure 2 Schematically shows a schematic diagram of a rotor-stator signal converter according to an embodiment of the present disclosure; and

[0024] Figure 3 Schematically shows a schematic diagram of a target rotating member according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is obvious that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present disclosure.

[0026] The terms used herein are for describing specific embodiments only and are not intended to limit the present disclosure. The terms such as "comprising" and "including" used herein indicate the presence of the described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0027] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted to have a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0028] In the case of using expressions such as "at least one of A, B, and C, etc.", generally, it should be interpreted according to the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include, but not be limited to, a system having only A, only B, only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0029] In the process of using a rotary stator signal converter to transmit the voltage signal measured by a thermocouple to a data acquisition instrument, there are differences in the temperatures of the environments where multiple transmission ends of the rotary stator signal converter are located. The influence of the environmental temperature difference on the rotary stator signal converter will introduce errors into the electrical signal measured by the thermocouple during transmission, thereby reducing the accuracy of the temperature corresponding to the electrical signal, that is, reducing the accuracy of the temperature measured based on the thermocouple.

[0030] In view of this, embodiments of the present disclosure provide a temperature measurement device, which can be applied to the technical field of temperature measurement.

[0031] Figure 1 A schematic structural diagram of a temperature measurement device according to an embodiment of the present disclosure is schematically shown.

[0032] As Figure 1 shown, the temperature measurement device 100 may include a thermocouple 110, a rotary stator signal converter 120, a first thermal resistor 130, a second thermal resistor 140, a data acquisition instrument 150, and a processor 160.

[0033] The thermocouple 110 may be disposed on the surface of a target rotating member. The thermocouple 110 may be configured to detect the measured temperature at the surface of the target rotating member.

[0034] According to an embodiment of the present disclosure, the type of the thermocouple may be selected according to actual circumstances and is not limited herein. For example, the thermocouple 110 may be a K-type thermocouple or a T-type thermocouple. The target rotating member may be a rotating disk.

[0035] The first end of the rotor-stator signal converter 120 is electrically connected to the reference end of the thermocouple 110.

[0036] The first thermal resistor 130 can be disposed at the first end of the rotor-stator signal converter 120. The first thermal resistor 130 can be configured to detect a first reference temperature at the first end of the rotor-stator converter 120.

[0037] The second thermal resistor 140 can be disposed at the second end of the rotor-stator signal converter 120. The second thermal resistor 140 can be configured to detect a second reference temperature at the second end of the rotor-stator converter 120.

[0038] For example, both the first thermal resistor 130 and the second thermal resistor 140 can be platinum thermal resistors PT100.

[0039] The first thermal resistor 130 can be electrically connected to the first end of the rotor-stator signal converter 120, and then electrically connected to the data acquisition instrument 150 via the second end of the rotor-stator signal converter 120. Among them, the first thermal resistor 130 and the thermocouple 110 are connected to different ports of the first end of the rotor-stator signal converter 120, and are electrically connected to the data acquisition instrument 150 via different ports of the second end of the rotor-stator signal converter 120.

[0040] The data acquisition instrument 150 can be electrically connected to the second end of the rotor-stator signal converter 120, the first thermal resistor 130, and the second thermal resistor 140. The data acquisition instrument 150 can be configured to collect a measurement electrical signal corresponding to the thermocouple 110, a first reference electrical signal corresponding to the first thermal resistor 130, and a second reference electrical signal corresponding to the second thermal resistor 140 when the target rotating part rotates.

[0041] The processor 160 can be configured to determine a measurement temperature, a first reference temperature, and a second reference temperature based on the measurement electrical signal, the first reference electrical signal, and the second reference electrical signal, and determine the first surface temperature of the target rotating part according to the measurement temperature, the first reference temperature, and the second reference temperature.

[0042] According to an embodiment of the present disclosure, when detecting a measured temperature at the surface of a target rotating part by using a thermocouple and electrically connecting a first end of a rotor-stator signal converter to a reference end of the thermocouple, a first reference temperature at the first end of the rotor-stator converter is detected by using a first thermal resistor, and a second reference temperature at the second end of the rotor-stator converter is detected by using a second thermal resistor. Thus, when a data acquisition instrument acquires a measured electrical signal corresponding to the thermocouple, a first reference electrical signal corresponding to the first thermal resistor, and a second reference electrical signal corresponding to the second thermal resistor while the target rotating part is rotating, a processor can determine the measured temperature, the first reference temperature, and the second reference temperature based on the measured electrical signal, the first reference electrical signal, and the second reference electrical signal, and determine a first surface temperature of the target rotating part according to the measured temperature, the first reference temperature, and the second reference temperature, so as to realize environmental temperature difference compensation for the measured temperature according to the reference temperatures at both ends of the rotor-stator converter and improve the accuracy of the obtained first surface temperature.

[0043] Figure 2 Schematically shows a schematic diagram of a rotor-stator signal converter according to an embodiment of the present disclosure.

[0044] As Figure 2 shown, the rotor-stator signal converter 120 may include a rotor structure 121 and a stator structure 122.

[0045] The rotor structure 121 may be connected to the target rotating part. A first end of the rotor structure 121 may be electrically connected to the thermocouple 110. A first end of the stator structure 122 is electrically connected to a second end of the rotor structure 121. A second end of the stator structure 122 may be electrically connected to the data acquisition instrument 150. Wherein, the stator structure 122 is fixed when the target rotating part rotates.

[0046] The first thermal resistor 130 may be disposed at the first end of the rotor structure 121. The second thermal resistor 140 may be disposed at the second end of the stator structure 122.

[0047] For example, the rotor-stator signal converter 120 may include a slip ring electrical connector.

[0048] According to an embodiment of the present disclosure, since the rotor structure of the stator-rotor signal converter is connected to the target rotating member, the rotor structure will rotate with the target rotating member during the rotation of the target rotating member. And since the first end of the stator structure of the stator-rotor signal converter is electrically connected to the second end of the rotor structure, the second end of the stator structure is electrically connected to the data collector, the stator structure remains stationary when the target rotating member rotates, and the first end of the rotor structure is electrically connected to the thermocouple. Since the stator-rotor signal converter is physically connected to the rotating member, when the rotating member conducts an experiment, it brings instability to the nearby ambient temperature, and the rotor structure rotates with the target rotating member, resulting in factors such as its own friction and heat dissipation during rotation of the rotor structure, causing a temperature difference between the temperature at the node where the rotor structure is electrically connected to the thermocouple and the temperature at the node where the second end of the stator structure is electrically connected to the data collector. When the temperature difference is large, the stator-rotor signal converter will introduce an error into the transmitted thermoelectric potential, thereby reducing the accuracy of the temperature corresponding to the thermoelectric potential, that is, reducing the accuracy of the temperature measured by the thermocouple. Therefore, the temperature measurement device provided by the embodiment of the present disclosure can improve the accuracy of the obtained first surface temperature by compensating the ambient temperature difference for the measured temperature measured by the thermocouple according to the reference temperature at both ends of the stator-rotor converter measured by the first thermistor and the second thermistor.

[0049] The first end of the stator-rotor signal converter 120 is electrically connected to the reference end of the thermocouple 110 based on the first wire. The second end of the stator-rotor signal converter 120 is electrically connected to the data collector 150 based on the second wire. The material of the first wire and the material of the second wire are the same as the material of the reference end of the thermocouple 110.

[0050] According to an embodiment of the present disclosure, when using a stator-rotor signal converter, such as a slip ring electrical connector, to transmit the electrical signal measured by the thermocouple, the material of the internal brush of the stator-rotor signal converter is silver and the external transmission line is copper, both of which are different from the material of the reference end of the thermocouple. When connecting the stator-rotor signal converter to the reference end of the thermocouple, it makes the reference end of the thermocouple access a conductor of other metal materials, which will introduce an additional error into the transmitted thermoelectric potential. When connecting the second end of the stator-rotor signal converter to the data collector and the wire connecting the stator-rotor signal converter and the data collector is different from the material of the reference end of the thermocouple, it will introduce an additional error into the transmitted thermoelectric potential.

[0051] Therefore, by electrically connecting the first end of the stator-rotor signal converter to the reference end of the thermocouple based on the first wire and electrically connecting the second end of the stator-rotor signal converter to the data collector based on the second wire, and making the material of the first wire and the material of the second wire the same as the material of the reference end of the thermocouple, the error in transmitting the electrical signal measured by the thermocouple based on the stator-rotor signal converter can be reduced.

[0052] According to an embodiment of the present disclosure, determining the first surface temperature of the target rotating member based on the measured temperature, the first reference temperature, and the second reference temperature includes: determining a temperature difference based on the first reference temperature and the second reference temperature; and when the temperature difference is less than the first preset threshold, determining the measured temperature as the first surface temperature.

[0053] According to an embodiment of the present disclosure, the first preset threshold can be selected according to the actual situation and is not limited herein. For example, the first preset threshold can be 0, 0.0001, 0.00001, etc.

[0054] According to an embodiment of the present disclosure, the number of the first thermoresistors can be at least one. The number of the second thermoresistors is equal to the number of the first thermoresistors.

[0055] For example, when the number of the first thermoresistors is 1, the difference is obtained by subtracting the second reference temperature from the first reference temperature, and the absolute value of the difference is taken to obtain the temperature difference. When the number of the first thermoresistors is multiple, the first average value is obtained by averaging multiple first reference temperatures corresponding to the multiple first thermoresistors, the second average value is obtained by averaging multiple second reference temperatures corresponding to the multiple second thermoresistors, then the difference is obtained by subtracting the second average value from the first average value, and the absolute value of the difference is taken to obtain the temperature difference.

[0056] According to an embodiment of the present disclosure, the first preset threshold can be selected according to the actual situation and is not limited herein.

[0057] According to an embodiment of the present disclosure, when the temperature difference is less than the first preset threshold, it indicates that the temperature difference between the two ends of the rotor-stator signal converter is small, the working environment of the rotor-stator signal converter is good, the error introduced into the electrical signal corresponding to the thermocouple transmitted by the rotor-stator signal converter is small and can be ignored, the measured temperature obtained based on the measured electrical signal corresponding to the thermocouple is relatively accurate and does not need to be calibrated, and when the measured temperature is determined as the first surface temperature, the first surface temperature is relatively accurate.

[0058] According to an embodiment of the present disclosure, determining the first surface temperature of the target rotating member based on the measured temperature, the first reference temperature, and the second reference temperature further includes:

[0059] When the temperature difference is greater than or equal to the first preset threshold, compensating the measured temperature based on the first reference temperature and the second reference temperature to obtain the first surface temperature.

[0060] For example, when the number of the first thermal resistors is 1, based on the measured temperature corresponding to the thermocouple 110, look up the thermocouple graduation table corresponding to the thermocouple 110 to obtain the measured temperature thermoelectromotive force. Based on the first reference temperature and the second reference temperature, look up the thermocouple graduation table corresponding to the thermocouple 110 respectively, to obtain the first thermoelectromotive force E(t1, 0) and the second thermoelectromotive force E(t2, 0) that correspond one by one to the first reference temperature t1 and the second reference temperature t2. According to the measured temperature thermoelectromotive force corresponding to the measured temperature, the first thermoelectromotive force E(t1, 0) and the second thermoelectromotive force E(t2, 0), obtain the compensated temperature thermoelectromotive force. Based on the compensated temperature thermoelectromotive force, look up the thermocouple graduation table corresponding to the thermocouple 110 to obtain the first surface temperature.

[0061] For example, according to formula (1), it is possible to obtain the compensated temperature thermoelectromotive force based on the measured temperature thermoelectromotive force corresponding to the measured temperature, the first thermoelectromotive force E(t1, 0) and the second thermoelectromotive force E(t2, 0).

[0062] Compensated temperature thermoelectromotive force = measured temperature thermoelectromotive force + E(t1, 0) - E(t2, 0) (1).

[0063] For example, when the number of the first thermal resistors is multiple, calculate the first average value of the multiple first reference temperatures corresponding to the multiple first thermal resistors, and calculate the second average value of the multiple second reference temperatures corresponding to the multiple second thermal resistors. Based on the measured temperature corresponding to the thermocouple 110, look up the thermocouple graduation table corresponding to the thermocouple 110 to obtain the measured temperature thermoelectromotive force. Based on the first average value and the second average value, look up the thermocouple graduation table corresponding to the thermocouple 110 respectively, to obtain the first average thermoelectromotive force E(t avg1 , 0) and the second average thermoelectromotive force E(t avg2 , 0) that correspond one by one. According to the measured temperature thermoelectromotive force corresponding to the measured temperature, the first average thermoelectromotive force E(t avg1 , 0) and the second average thermoelectromotive force E(t avg2 , 0), obtain the compensated temperature thermoelectromotive force. Based on the compensated temperature thermoelectromotive force, look up the thermocouple graduation table corresponding to the thermocouple 110 to obtain the first surface temperature.

[0064] According to the embodiments of the present disclosure, the method for obtaining the compensated temperature thermoelectromotive force based on the measured temperature thermoelectromotive force corresponding to the measured temperature, the first average thermoelectromotive force E(t avg1 , 0) and the second average thermoelectromotive force E(t avg2 , 0) is similar to the method for obtaining the compensated temperature thermoelectromotive force based on the measured temperature thermoelectromotive force corresponding to the measured temperature, the first thermoelectromotive force E(t1, 0) and the second thermoelectromotive force E(t2, 0), and will not be elaborated here for the sake of simplicity.

[0065] According to an embodiment of the present disclosure, when the temperature difference is greater than or equal to a first preset threshold, it indicates that the temperature difference between the two ends of the rotor-stator signal converter is relatively large, the working environment of the rotor-stator signal converter is relatively harsh, the error introduced into the electrical signal corresponding to the thermocouple transmitted by the rotor-stator signal converter is relatively large, and the error of the measured temperature obtained based on the measured electrical signal corresponding to the thermocouple is relatively large. Therefore, when the temperature difference is greater than or equal to the first preset threshold, the measured temperature is compensated according to the first reference temperature and the second reference temperature to obtain the first surface temperature, so as to realize compensating the measured temperature obtained from the measured electrical signal corresponding to the thermocouple based on the reference temperatures at both ends of the rotor-stator signal converter when the temperature difference is greater than or equal to the first preset threshold, and obtaining a relatively accurate first surface temperature.

[0066] For example, the processor 160 may further be configured to: when the number of the thermocouples 110 is multiple, calculate the standard deviation of the multiple first surface temperatures respectively corresponding to the multiple thermocouples 110; when the standard deviation is less than a second preset threshold, perform a weighted sum on the multiple first surface temperatures respectively corresponding to the multiple thermocouples 110 to obtain the target surface temperature.

[0067] According to an embodiment of the present disclosure, the second preset threshold may be selected according to the actual situation and is not limited herein.

[0068] For example, the average value of the multiple first surface temperatures respectively corresponding to the multiple thermocouples 110 may be calculated, and then based on this average value, the root mean square error of the multiple first surface temperatures respectively corresponding to the multiple thermocouples 110 may be calculated to obtain the standard deviation.

[0069] For example, the average value of the multiple first surface temperatures respectively corresponding to the multiple thermocouples 110 may be obtained to obtain the target surface temperature.

[0070] According to an embodiment of the present disclosure, when the number of the thermocouples is multiple, the standard deviation of the multiple first surface temperatures respectively corresponding to the multiple thermocouples is calculated. When the standard deviation is less than the second preset threshold, it indicates that the multiple first surface temperatures respectively corresponding to the multiple thermocouples are not affected by the ambient temperature after temperature compensation. Therefore, by performing a weighted sum on the multiple first surface temperatures respectively corresponding to the multiple thermocouples, the target surface temperature is obtained, and a target surface temperature with relatively high accuracy is obtained.

[0071] For example, the number of the first thermal resistors 130 may be multiple, and the multiple first thermal resistors 130 may be respectively arranged on circumferences with different radii centered at the center of the end face of the first end of the rotor-stator signal converter 120. The number of the second thermal resistors 140 may be multiple, and the positions of the multiple second thermal resistors 140 at the second end are symmetrically arranged with the positions of the multiple first thermal resistors 130 at the first end.

[0072] The processor 160 may also be configured to: when the standard deviation is greater than or equal to a second preset threshold, determine at least one first target thermocouple from among the plurality of thermocouples 110, wherein, for each of the at least one first target thermocouple, the absolute value of the difference between the corresponding first surface temperature and the average temperature is greater than a difference threshold, and the average temperature is obtained by calculating the average value of the plurality of first surface temperatures corresponding to the plurality of thermocouples 110;

[0073] For each first target thermocouple, determine a target port at which the first end of the stator-rotor signal converter 120 is connected to the first target thermocouple;

[0074] Determine at least two target first thermal resistors close to the target port from among the plurality of first thermal resistors 130;

[0075] Compensate the measured temperature corresponding to the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to the at least two target first thermal resistors and at least two second reference temperatures corresponding to the at least two target second thermal resistors, to obtain the second surface temperature of the target rotating member, wherein the positions of the at least two target second thermal resistors at the second end are symmetrically arranged with respect to the positions of the at least two target first thermal resistors at the first end;

[0076] Perform a weighted sum of at least one second surface temperature corresponding to the at least one first target thermocouple and at least one first surface temperature corresponding to at least one second target thermocouple, to obtain the target surface temperature, wherein, for each of the at least one second target thermocouple, the absolute value of the difference between the corresponding first surface temperature and the average temperature is less than or equal to the difference threshold.

[0077] According to an embodiment of the present disclosure, it can be known that Figure 2 the first end of the stator-rotor signal converter rotates as the target rotating member rotates. Thus, there may be a deviation in the temperature at the first end of the stator-rotor signal converter from the center of the circle to different circumferential positions. When this deviation is large, using the reference temperatures measured at both ends of the stator-rotor converter by the plurality of first thermal resistors and the plurality of second thermal resistors to perform ambient temperature difference compensation on the measured temperature measured by the thermocouple will cause the first surface temperature corresponding to some of the thermocouples to still be greatly affected by the ambient temperature, and further temperature compensation is required for the first surface temperature corresponding to this part of the thermocouples.

[0078] According to an embodiment of the present disclosure, when the standard deviation is greater than or equal to the second preset threshold, it indicates that after temperature compensation, among the plurality of first surface temperatures corresponding to the plurality of thermocouples 110 respectively, there are still some first surface temperatures affected by the ambient temperature. Therefore, further temperature compensation is required for the first surface temperatures affected by the ambient temperature.

[0079] According to an embodiment of the present disclosure, the difference threshold can be selected according to the actual situation and is not limited herein. For example, the difference threshold can be 3 times the standard deviation.

[0080] For example, the number of the plurality of first thermal resistors 130 can be 4. The first first thermal resistor 130 can be on the first circumference, the second first thermal resistor 130 can be on the second circumference, the third first thermal resistor 130 can be on the third circumference, and the fourth first thermal resistor 130 can be on the fourth circumference. The radius of the first circumference is less than the radius of the second circumference, the radius of the second circumference is less than the radius of the third circumference, and the radius of the third circumference is less than the radius of the fourth circumference. The plurality of first thermal resistors 130 can be on the same straight line passing through the center of the circle.

[0081] The number of the plurality of thermocouples 110 can be 5. When the absolute value of the difference between the first surface temperature and the average temperature corresponding to the first thermocouple among the 5 thermocouples 110 is greater than the difference threshold, the first thermocouple is determined as the first target thermocouple.

[0082] The first end of the rotor-stator signal converter 120 and the ports corresponding to the plurality of thermocouples 110 can be pre-configured, and the first thermal resistors close to the ports corresponding to the plurality of thermocouples 110 can also be pre-configured. So that after the first thermocouple is determined as the first target thermocouple, based on the pre-configured information, for the first target thermocouple, the target port connected to the first target thermocouple among the plurality of ports included in the first end of the rotor-stator signal converter 120 can be determined, and at least two target first thermal resistors close to the target port can be determined from the plurality of first thermal resistors 130.

[0083] For example, the target ports corresponding to the first thermocouple can include a first target port and a second target port. The first reference end of the first thermocouple is electrically connected to the first target port, and the second reference end of the first thermocouple is electrically connected to the second target port. The material of the first wire connecting the first reference end and the first target port is the same as the material of the first reference end. The material of the first wire connecting the second reference end and the second target port is the same as the material of the second reference end. The first target port and the second target port can both be within the second circumference and the third circumference. At this time, the two first thermal resistors 130 provided on the second circumference and the third circumference can be determined as the two target first thermal resistors corresponding to the first target port and the second target port.

[0084] According to an embodiment of the present disclosure, when the first target port and the second target port are in different circumferences, the first thermal resistors on the circumferences corresponding to the first target port and the second target port respectively can be determined as the first thermal resistors.

[0085] According to an embodiment of the present disclosure, there may also be multiple first thermal resistors 130 provided on each circumference. In this case, at least two circumferences close to the target port can be determined, and the multiple first thermal resistors 130 on the at least two circumferences are all determined as the target first thermal resistors.

[0086] According to an embodiment of the present disclosure, compensating the measured temperature of the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to at least two target first thermal resistors and at least two second reference temperatures corresponding to at least two target second thermal resistors to obtain the second surface temperature of the target rotating member includes: calculating the average value of at least two first reference temperatures corresponding to at least two target first thermal resistors to obtain the average first reference temperature; calculating the average value of at least two second reference temperatures corresponding to at least two target second thermal resistors to obtain the average second reference temperature; compensating the measured temperature of the first target thermocouple connected to the target port according to the average first reference temperature and the average second reference temperature to obtain the second surface temperature of the target rotating member.

[0087] For example, in the case where two first thermal resistors 130 provided on the second circumference and the third circumference are determined as two target first thermal resistors corresponding to the first target port and the second target port, the average value of the two first reference temperatures corresponding to the two target first thermal resistors is calculated to obtain the average first reference temperature. The average value of the two second reference temperatures corresponding to the two target second thermal resistors is calculated to obtain the average second reference temperature. Among them, the positions of the two target second thermal resistors at the second end are symmetrically arranged with the positions of the two target first thermal resistors at the first end.

[0088] According to an embodiment of the present disclosure, the method of compensating the measured temperature of the first target thermocouple connected to the target port according to the average first reference temperature and the average second reference temperature to obtain the second surface temperature of the target rotating member is similar to the method of compensating the measured temperature according to the first reference temperature and the second reference temperature to obtain the first surface temperature. For the sake of simplicity, it will not be elaborated here.

[0089] The weighted sum of the second surface temperature corresponding to the first target thermocouple and the first surface temperatures corresponding to the second thermocouple, the third thermocouple, the fourth thermocouple, and the fifth thermocouple among the 5 thermocouples is obtained to obtain the target surface temperature.

[0090] For example, the average value of the second surface temperature corresponding to the first target thermocouple and the first surface temperatures corresponding to the second thermocouple, the third thermocouple, the fourth thermocouple, and the fifth thermocouple among the 5 thermocouples can be obtained to obtain the target surface temperature.

[0091] According to an embodiment of the present disclosure, by means of compensating the measured temperature corresponding to a first target thermocouple connected to a target port based on a first reference temperature corresponding to a target first thermal resistor close to the target port and a second reference temperature corresponding to a target second thermal resistor symmetric to the target first thermal resistor, a second surface temperature with higher accuracy than the first surface temperature can be obtained. Furthermore, when performing a weighted sum of at least one second surface temperature corresponding to at least one first target thermocouple and at least one first surface temperature corresponding to at least one second target thermocouple to obtain a target surface temperature, a target surface temperature with higher accuracy can be obtained.

[0092] The processor 160 may also be configured to: determine a first expanded uncertainty corresponding to the thermocouple 110 according to the target surface temperature and a calibration table corresponding to the thermocouple 110; determine a second expanded uncertainty corresponding to the plurality of first thermal resistors according to the plurality of first reference temperatures corresponding to the plurality of first thermal resistors 130 and a calibration table corresponding to the plurality of first thermal resistors 130; determine a third expanded uncertainty corresponding to the data collector 150 according to a calibration table corresponding to the data collector 150; and determine the expanded uncertainty of the target surface temperature according to the first expanded uncertainty, the second expanded uncertainty, the third expanded uncertainty, and a predetermined uncertainty formula.

[0093] According to an embodiment of the present disclosure, the temperature points of the plurality of first reference temperatures corresponding to the plurality of first thermal resistors 130 in the calibration table corresponding to the plurality of first thermal resistors 130 may be determined according to the plurality of first reference temperatures corresponding to the plurality of first thermal resistors 130, and the calibration table corresponding to the plurality of first thermal resistors 130 may be searched according to the temperature points to obtain the second expanded uncertainty corresponding to the plurality of first thermal resistors 130. The first expanded uncertainty, the second expanded uncertainty, and the third expanded uncertainty may be substituted into a predetermined uncertainty formula to obtain the expanded uncertainty of the target surface temperature.

[0094] According to an embodiment of the present disclosure, the expanded uncertainty of the target surface temperature can characterize the confidence and authenticity of the target surface temperature, so that the target surface temperature can be reasonably used to evaluate the true temperature of the target rotating member based on the expanded uncertainty of the target surface temperature subsequently.

[0095] Figure 3 A schematic diagram of a target rotating member according to an embodiment of the present disclosure is schematically shown.

[0096] [[ID=l6]]As Figure 3 shown, when the target rotating member is the rotating disk 301, the first wire is connected to the first end of the rotor-stator signal converter via the central hole 3011 of the rotating disk 301.

[0097] Since the measured electrical signal measured by the thermocouple 310 is converted between the stationary and rotating parts via a stator-rotor signal converter, such as a slip ring collector. Therefore, the first wire connecting the reference end of the thermocouple 310 needs to be aggregated at the axial hole 3011 of the rotating disk 301 and connected to the stator-rotor signal converter through the axial hole 3011.

[0098] For example, after the first wire is electrically connected to the reference end of the thermocouple, the first wire can be routed on the end face of the rotating disk 301 based on the wire routing grooves on the end face of the rotating disk 301 and fixed based on the wire fixing holes provided in the wire routing grooves. Then, the first wire can be led from the end face of the rotating disk 301 to the axial hole of the rotating disk 301 through the lead hole on the rotating disk 301.

[0099] Those skilled in the art can understand that the features described in the various embodiments of the present disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present disclosure.

[0100] The embodiments of the present disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments have been described separately above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present disclosure is defined by the appended embodiments and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art can make various substitutions and modifications, and all such substitutions and modifications should fall within the scope of the present disclosure.

Claims

1. A temperature measurement device, comprising: a thermocouple disposed on the surface of a target rotating member and configured to detect a measured temperature at the surface of the target rotating member; a rotor-stator signal converter, a first end of the rotor-stator signal converter being electrically connected to a reference end of the thermocouple; a first thermal resistor disposed at the first end of the rotor-stator signal converter, the first thermal resistor being configured to detect a first reference temperature at the first end of the rotor-stator converter; a second thermal resistor disposed at a second end of the rotor-stator signal converter, the second thermal resistor being configured to detect a second reference temperature at the second end of the rotor-stator converter; a data acquisition instrument, the data acquisition instrument being electrically connected to the second end of the rotor-stator signal converter, the first thermal resistor, and the second thermal resistor, and the data acquisition instrument being configured to collect a measured electrical signal corresponding to the thermocouple, a first reference electrical signal corresponding to the first thermal resistor, and a second reference electrical signal corresponding to the second thermal resistor when the target rotating member rotates; a processor configured to determine the measured temperature, the first reference temperature, and the second reference temperature based on the measured electrical signal, the first reference electrical signal, and the second reference electrical signal, and to determine a first surface temperature of the target rotating member according to the measured temperature, the first reference temperature, and the second reference temperature.

2. The device according to claim 1, wherein The rotor-stator signal converter includes: a rotor structure connected to the target rotating member, a first end of the rotor structure being electrically connected to the thermocouple; a stator structure, a first end of the stator structure being electrically connected to a second end of the rotor structure, and a second end of the stator structure being electrically connected to the data acquisition instrument, wherein the stator structure is fixed when the target rotating member rotates.

3. The device according to claim 1 or 2, wherein, The determining the first surface temperature of the target rotating member according to the measured temperature, the first reference temperature, and the second reference temperature includes: determining a temperature difference according to the first reference temperature and the second reference temperature; when the temperature difference is less than a first preset threshold, determining the measured temperature as the first surface temperature.

4. The apparatus according to claim 3, wherein The determining the first surface temperature of the target rotating member according to the measured temperature, the first reference temperature, and the second reference temperature further includes: when the temperature difference is greater than or equal to the first preset threshold, compensating the measured temperature according to the first reference temperature and the second reference temperature to obtain the first surface temperature.

5. The device according to any one of claims 1 to 4, wherein The processor is further configured to: when the number of the thermocouples is multiple, calculate a standard deviation of multiple first surface temperatures respectively corresponding to the multiple thermocouples; when the standard deviation is less than a second preset threshold, perform a weighted sum of multiple first surface temperatures respectively corresponding to the multiple thermocouples to obtain a target surface temperature.

6. The device according to claim 5, wherein, The number of the first thermal resistors is multiple, and the multiple first thermal resistors are respectively arranged on circumferences with different radii centered at the center of the end face of the first end of the rotor-stator signal converter; the number of the second thermal resistors is multiple, and the positions of the multiple second thermal resistors at the second end are symmetrically arranged with respect to the positions of the multiple first thermal resistors at the first end; The processor is further configured to: when the standard deviation is greater than or equal to a second preset threshold, determine at least one first target thermocouple from the multiple thermocouples, wherein, for each of the at least one first target thermocouples, the absolute value of the difference between the corresponding first surface temperature and the average temperature is greater than a difference threshold, and the average temperature is obtained by calculating the average value of the multiple first surface temperatures corresponding to the multiple thermocouples; For each first target thermocouple, determine a target port at the first end of the rotor-stator signal converter connected to the first target thermocouple; Determine at least two target first thermal resistors close to the target port from the multiple first thermal resistors; Compensate the measured temperature corresponding to the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to the at least two target first thermal resistors and at least two second reference temperatures corresponding to at least two target second thermal resistors, to obtain the second surface temperature of the target rotating member, wherein the positions of the at least two target second thermal resistors at the second end are symmetrically arranged with respect to the positions of the at least two target first thermal resistors at the first end; Perform weighted summation on at least one second surface temperature corresponding to the at least one first target thermocouple and at least one first surface temperature corresponding to at least one second target thermocouple, to obtain a target surface temperature, wherein, for each of the at least one second target thermocouples, the absolute value of the difference between the corresponding first surface temperature and the average temperature is less than or equal to the difference threshold.

7. The device according to claim 6, wherein The compensating the measured temperature corresponding to the first target thermocouple connected to the target port according to at least two first reference temperatures corresponding to the at least two target first thermal resistors and at least two second reference temperatures corresponding to at least two target second thermal resistors, to obtain the second surface temperature of the target rotating member includes: Calculating the average value of at least two first reference temperatures corresponding to the at least two target first thermal resistors, to obtain an average first reference temperature; Calculating the average value of at least two second reference temperatures corresponding to the at least two target second thermal resistors, to obtain an average second reference temperature; Compensating the measured temperature corresponding to the first target thermocouple connected to the target port according to the average first reference temperature and the average second reference temperature, to obtain the second surface temperature of the target rotating member.

8. The apparatus according to claim 7, wherein, The processor is further configured to: Determine a first expanded uncertainty corresponding to the thermocouple according to the target surface temperature and a calibration table corresponding to the thermocouple; Determine a second expanded uncertainty corresponding to the multiple first thermal resistors according to multiple first reference temperatures corresponding to the multiple first thermal resistors and a calibration table corresponding to the multiple first thermal resistors; Determine a third expanded uncertainty corresponding to the data collector according to a calibration table corresponding to the data collector; Determine the expanded uncertainty of the target surface temperature according to the first expanded uncertainty, the second expanded uncertainty, the third expanded uncertainty, and a predetermined uncertainty formula.

9. The device according to claim 1 or 2, wherein A first end of the rotor-stator signal converter is electrically connected to a reference end of the thermocouple based on a first wire, and a second end of the rotor-stator signal converter is electrically connected to the data collector based on a second wire. Materials of the first wire and the second wire are the same as a material of the reference end of the thermocouple.

10. The apparatus according to claim 8, wherein, When the target rotating member is a rotating disk, the first wire is connected to the first end of the rotor-stator signal converter through an axial hole of the rotating disk.

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