CN106644170A - Thermal resistor fault diagnosis device and method - Google Patents
Thermal resistor fault diagnosis device and method Download PDFInfo
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- CN106644170A CN106644170A CN201611229184.4A CN201611229184A CN106644170A CN 106644170 A CN106644170 A CN 106644170A CN 201611229184 A CN201611229184 A CN 201611229184A CN 106644170 A CN106644170 A CN 106644170A
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- thermal resistance
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- rtd sensor
- rtd
- bolometric
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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Abstract
The invention discloses a thermal resistor fault diagnosis device and method. The thermal resistor fault diagnosis device comprises a thermal resistance tester and a portable mobile terminal, wherein the thermal resistor tester is connected with the portable mobile terminal through a USB data line; and the thermal resistor tester is connected to an RTD sensor of a tested thermal resistor through a signal line. By adopting a thermal resistor circuit step current response time method, a traditional temperature probe diagnosis function can be achieved, diagnosis information can be provided for an installation environment heat conduction change of a probe, the installation position condition of a temperature probe and the aging trend of the temperature probe, and a reasonable and effective suggestion can be provided for preventative maintenance and corrective maintenance of the temperature probe.
Description
Technical field
The present invention relates to thermal resistance fault diagnosis technology field, in particular, is to be related to a kind of thermal resistance fault diagnosis
Device and method.
Background technology
For thermal resistance fault diagnosis tests the resistance value method of thermal resistance using favour stone balanced bridge, in industrial temperature
Extensively apply in collection fastener.At present, conventional temperature probe itself fault diagnosis scheme, is typically required to temperature probe from now
Tearing back laboratory open is verified and is demarcated, and is not by specific instrument, but by a series of maintenance overhaul means
Carry out, the verification, the insulation continuity check of temperature probe such as temperature probe, and traditional temperature probe inspection method, only
Diagnostic function can be provided to probe failure itself, and the installation environment and installation site situation to popping one's head in cannot provide conclusion；Separately
Outward, at present can also be according to heat balance principle, when a certain fixed step current is increased in the thermal resistance loop of system under test (SUT), quilt
The increase that the time of electric current is passed through with which is changed by the resistance value or temperature value of bolometric, until system under test (SUT) reaches heat
Balance, temperature tend towards stability, and from the beginning of electric current is added, reach to final system under test (SUT) and stablize, and are the step current responses of equipment
Time trend, when system under test (SUT) reaches thermal balance, resistance value will be maintained at that a certain steady state value is constant, but the stable of temperature exists
In 1 ‰ accuracy rating, the on-line measurement time grown is needed very much, the time to in-site measurement is brought into unfavorable, scene is surveyed in addition
Amount overlong time, although can realize continuity check, but original working environment has a large change, obtained by fore-and-aft survey
Error in data is big.
The content of the invention
In view of this, the invention provides a kind of thermal resistance trouble-shooter and method, with solve in prior art by
According to heat balance principle, from the beginning of electric current is added, reach to final system under test (SUT) and stablize, when being that the step current of equipment is responded
Between trend, when system under test (SUT) reaches thermal balance, resistance value will be maintained at that a certain steady state value is constant, but the stable of temperature exists
In 1 ‰ accuracy rating, the on-line measurement time grown is needed very much, the time to in-site measurement is brought into unfavorable, scene is surveyed in addition
Amount overlong time, although can realize continuity check, but original working environment has a large change, obtained by fore-and-aft survey
The big problem of error in data.
For achieving the above object, the present invention provides following technical scheme：
A kind of thermal resistance trouble-shooter, including：Thermal resistance tester and portable mobile termianl, the thermal resistance are surveyed
Examination instrument and the portable mobile termianl are connected by USB data line, and the thermal resistance tester connects tested by holding wire
The RTD sensor of thermal resistance, wherein：
The thermal resistance tester includes data collecting system and program controlled constant current source, the thermal resistance tester with it is described
RTD sensor provides hardwire connection, by the program controlled constant current source, to the RTD sensor set with constant current, by institute
The voltage at RTD sensor two ends described in data acquisition system is stated, the resistance for the RTD sensor is measured；
The portable mobile termianl built-in thermoelectric resistance measurement analysis software, is received operator and is surveyed by the thermal resistance
Amount analysis software arranges the technical parameter by bolometric, and is input into described to described by the technical parameter of bolometric
Thermal resistance tester, carries out measurement, data acquisition and the data analysiss of the RTD sensor response time.
Wherein, the data collecting system is equipped with 1 tunnel analog output channel and 2 road analog acquisition passages.
Wherein, the exportable 0～10V magnitudes of voltage in the analog output channel, for controlling the output of the program controlled constant current source
Electric current.
Wherein, the analog acquisition passage can gather 0～10V magnitudes of voltage, for gathering the RTD sensor holding wire
Voltage.
Wherein, the program controlled constant current source exports the constant current of 0～100mA.
Wherein, it is described to be included by the technical parameter of bolometric：The POF by bolometric, model, material,
Environment cooling medium and it is passed through current setting value.
A kind of thermal resistance method for diagnosing faults, is applied to thermal resistance trouble-shooter, the thermal resistance fault diagnosis dress
Put including thermal resistance tester and portable mobile termianl, the thermal resistance tester and the portable mobile termianl pass through
USB data line connects, and the thermal resistance tester is connected by the RTD sensor of bolometric by holding wire, and the method includes：
RTD is measured the portable mobile termianl analog output channel output of analysis software control data acquisition system
Control voltage, controls the program controlled constant current source and exports constant current, and the constant current passes to the RTD through the holding wire
Sensor；
2 road analog acquisition passages of the data collecting system collect the first voltage and second on holding wire respectively
Voltage, wherein, the first voltage includes the voltage of the voltage of two holding wires and the RTD sensor, the second voltage
The voltage of voltage and the RTD sensor including a holding wire；
The portable mobile termianl calculates the resistance value of the RTD sensor according to preset formula, carries out the RTD biographies
The measurement of sensor response time and data analysiss；
The tested thermoelectricity is calculated according to the measurement result and the data results of the RTD sensor response time
The thermal resistance step current response time of the RTD sensor of resistance, stability forecast value, as measured parameter data；
To be contrasted with the measured parameter data by the technical parameter of bolometric, obtain the thermal resistance failure and examine
Disconnected result.
Understand via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of thermal resistance fault diagnosis
Device and method, the thermal resistance trouble-shooter include thermal resistance tester and portable mobile termianl, thermal resistance tester
Connected by USB data line with portable mobile termianl, thermal resistance tester is connected by the RTD biographies of bolometric by holding wire
Sensor, the present invention adopt thermal resistance loop step current response time method, can not only realize traditional temperature probe diagnosis
Function, and can also to pop one's head in installation environment heat conduction change, temperature probe installation site situation, temperature probe aging tendency
Diagnostic message is given, can be given to the preventative maintenance of temperature probe and corrective maintenance and rationally effectively be advised.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of thermal resistance trouble-shooter structural representation provided in an embodiment of the present invention；
Fig. 2 is a kind of thermal resistance trouble-shooter structure connection diagram provided in an embodiment of the present invention；
Fig. 3 is the basic circuit diagram of thermal resistance measurement provided in an embodiment of the present invention；
Fig. 4 is thermal resistance response curve schematic diagram provided in an embodiment of the present invention；
Fig. 5 is resistance and temperature provided in an embodiment of the present invention-time average curve synoptic diagram；
Fig. 6 is the trend curve schematic diagram of the thermal response time and relevant parameter of thermal resistance provided in an embodiment of the present invention；
Fig. 7 is a kind of thermal resistance method for diagnosing faults schematic flow sheet provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The thermal resistance trouble-shooter on-line measurement time that the present invention is provided is short, and error of measured data is within 1 ‰.Tool
Body, RTDs thermal resistance on-line fault diagnosis instruments according to system under test (SUT) heat balance principle, first by favour stone balanced bridge
Principle measurement draws the thermal resistance step current time response trend curve of a period of time (about 2 minutes).Then, by intelligent god
The study of Jing networks (BP networks) and self adaptation, are fitted complete BP neural network forecast curves of output, calculate and obtain complete equipment
Go out the response time of equipment；According to the complete trend of intelligent Neural Network fitting, the sound of the step current of equipment under test is calculated
Between seasonable, equilibrium temperature predictive value, precision and error.Finally, it is right to be carried out by the measured parameter data of individual equipment and standard
Than drawing thermal resistance diagnosis.
Accompanying drawing 1 is referred to, Fig. 1 is a kind of thermal resistance trouble-shooter structural representation provided in an embodiment of the present invention.
As shown in figure 1, the invention discloses a kind of thermal resistance trouble-shooter, including：Thermal resistance tester 1 and Portable movable end
End 2, thermal resistance tester 1 and portable mobile termianl 2 are connected by USB data line, and thermal resistance tester 1 is connected by holding wire
Connect by the RTD sensor 3 of bolometric, wherein：
Thermal resistance tester 1 includes data collecting system 11 and program controlled constant current source 12, and thermal resistance tester 1 is sensed with RTD
Device 3 provides hardwire connection, by program controlled constant current source 12, gives RTD sensor 3 set with constant current, by data collecting system
The voltage at 11 3 two ends of collection RTD sensor, the resistance for RTD sensor 3 are measured；
2 built-in thermoelectric of portable mobile termianl resistance measurement analysis software, is received operator and is analyzed by thermal resistance measurement
Software design patterns are by the technical parameter of bolometric, and will be input into thermal resistance tester 1 by the technical parameter of bolometric, carry out
The measurement of RTD sensor response time, data acquisition and data analysiss.
Wherein, data collecting system 1 is equipped with 1 tunnel analog output channel and 2 road analog acquisition passages.
Wherein, the exportable 0～10V magnitudes of voltage in analog output channel, for controlling the output current of the program controlled constant current source.
Wherein, analog acquisition passage can gather 0～10V magnitudes of voltage, for gathering the electricity on the RTD sensor holding wire
Pressure.
Wherein, program controlled constant current source 12 exports the constant current of 0～100mA.
Wherein, included by the technical parameter of bolometric：The POF by bolometric, model, material, environment
Cooling medium and it is passed through current setting value.
Specifically, operation principle of the invention：
RTDs thermal resistance on-line fault diagnosis instruments, using favour stone principle of balance bridge, design and write software control
Program；Design and assembling hardware device, realize the collection and measurement of resistance value.As shown in figure 1, the holding wire (3 of RTD sensor
Core) be connected to RTDs thermal resistance inline diagnosis instruments after, RTD measurement analysis software control data acquisition system simulation output lead to
Road AO1 output control voltages so that program controlled constant current source output current (I), electric current pass to RTD sensings through 1 and the 2 of holding wire
Device.
The analog input channel AI1 and AI2 of data collecting system collects voltage U12 and U13 on holding wire respectively.Its
The voltage of middle U12 includes the voltage of the voltage and RTD sensor of two holding wires, and the voltage of U13 includes the electricity of a holding wire
The voltage of pressure and RTD sensor.Therefore the voltage URTD=2*U13-U12 of RTD sensor.According to formula RRTD=URTD/I,
The resistance value of RTD sensor can be calculated.
Accompanying drawing 2 is referred to, Fig. 2 is a kind of thermal resistance trouble-shooter structure connection signal provided in an embodiment of the present invention
Figure.As shown in Fig. 2 measurement realization is specially：Measurement host and notebook computer are connected by USB data line.By notebook
Relevant parameter is set, and the data that main frame is collected pass through the incoming notebooks of USB, by special Software on Drawing response time trend
Curve.
For the measuring principle of response time：
Assume that inserting for temperature sensor will not change measured medium temperature, temperature sensor temperature is uniform, temperature is passed
Sensor non-thermal radiation energy loss.The equation of heat balance for setting up temperature sensor is：
Wherein, in (1) formula：C-temperature sensor specific heat capacity, J (kgK)；M-temperature sensor quality, kg；T(t)—
Temperature sensor temperature (mean body temperature degree) time function, K；T-time variable, s；Δ-temperature sensor dissipation factor,
W/K；Tθ(t)-measured medium temperature-time function, K.Formula (1) is written as：
Wherein, in (2) formula：τ --- the thermal time constant of the dimension with the time, referred to as temperature sensor, τ=cm/ δ；
From formula (2), due to the presence of non-zero τ, T (t) ≠ T within the limited timeθT (), this is temperature survey dynamic error
Mathematics root.Work as Tθ(t)=Tθ(constant), and T (t) |T=0=T0, the solution of formula (2) is：
Obtained by formula (3)：
From formula (4), as [T (t)-T0(the T of]=0.632θ-T0) when, t=τ.
Thus obtain the implication of temperature sensor thermal time constant：It is permanent that temperature sensor with certain initial temperature is put into temperature
After in fixed medium, the temperature variation of temperature sensor reaches medium temperature with the difference of temperature sensor initial temperature by zero
Time used by 63.2%.The time, that is, the thermal resistance current-responsive time that this instrument needs are measured.
Show with up-to-date style τ=cm/ δ again：Due to the impact of medium factor, the thermal time constant of a temperature sensor is not
Uniquely, now need to measure the thermal time constant value under particular medium environmental condition.
Thermal resistance is heated by constant DC current, heated current maximum is less than 55mA (for existing
The protection of field thermal resistance equipment, sets its maximum heat current 55mA in systems soft ware, prevents maloperation from causing electric current excessive
Burn live thermal resistance equipment).
The measurement of concrete thermal resistance, can connect three line thermoelectricity using three-wire wiring method as shown in Figure 3 in the present invention
Resistance temperature sensor, it is also possible to suitable for four-wire system thermal resistance, applying in the case of four-wire system thermal resistance, in connection system
Need before for four-wire system to be converted to three-wire system and be capable of achieving same application.First disconnected such as the current limliting electricity in Fig. 3 before measuring
Resistance short switch, in making loop, direct current constant electric current is 1～2mA or so, adjusts the potentiometer on another bridge arm of Wheatstone bridge,
Make difference amplifier be output as zero, hereafter close DC current during current-limiting resistance short switch makes loop and rise to 30～50mA
And keep constant, switch closure while start to be acquired the output of difference amplifier, until the output it is basicly stable
When disconnect and current-limiting resistance short switch stop gathering the output of amplifier of checking the mark, as shown in Figure 4.
Numerical analysis：The Temperature-time meansigma methodss curve of the various temperature-sensing element that in-site measurement is generated enters as shown in Figure 5
Row numerical analysis, obtains the thermal response time τ of various temperature-sensing element.
Trend shows：By generate each model temperature-sensing element Temperature-time meansigma methodss curve, analysis obtain each
The thermal response time and relevant parameter of model temperature-sensing element with portion chart in show, as shown in Figure 6.
The invention discloses a kind of thermal resistance trouble-shooter, should include thermal resistance tester and Portable movable end
End, thermal resistance tester and portable mobile termianl are connected by USB data line, and thermal resistance tester connects quilt by holding wire
The RTD sensor of bolometric, the present invention adopt thermal resistance loop step current response time method, can not only realize tradition
Temperature probe diagnostic function, and can also to pop one's head in installation environment heat conduction change, temperature probe installation site situation, temperature
The aging tendency of probe provides diagnostic message, can be given rationally effectively to the preventative maintenance of temperature probe and corrective maintenance
Suggestion.
The present invention also discloses a kind of method on the basis of device disclosed above.
Accompanying drawing 7 is referred to, Fig. 7 is a kind of thermal resistance method for diagnosing faults schematic flow sheet provided in an embodiment of the present invention.
As shown in fig. 7, the invention discloses a kind of thermal resistance method for diagnosing faults, is applied to thermal resistance trouble-shooter, the heat
The Resistance Fault diagnostic equipment includes thermal resistance tester and portable mobile termianl, the thermal resistance tester and described portable
Mobile terminal is connected by USB data line, and the thermal resistance tester is connected by the RTD sensings of bolometric by holding wire
Device, the method include：
The analog output channel that RTD is measured analysis software control data acquisition system by S701, portable mobile termianl is defeated
Go out control voltage, control program controlled constant current source output constant current, constant current pass to RTD sensor through holding wire；
S702,2 road analog acquisition passages of data collecting system collect the first voltage on holding wire and respectively
Two voltages, wherein, first voltage includes the voltage of the voltage and RTD sensor of two holding wires, and second voltage includes a letter
The voltage and the voltage of RTD sensor of number line；
S703, portable mobile termianl calculate the resistance value of RTD sensor according to preset formula, carry out RTD sensor sound
Measurement and data analysiss between seasonable；
S704, the measurement result according to RTD sensor response time and the data results are calculated by bolometric
The thermal resistance step current response time of RTD sensor, stability forecast value, as measured parameter data；
S705, will be contrasted by the technical parameter and measured parameter data of bolometric, obtained thermal resistance fault diagnosis
As a result.
Specifically, operation principle of the invention：
RTDs thermal resistance on-line fault diagnosis instruments, using favour stone principle of balance bridge, design and write software control
Program；Design and assembling hardware device, realize the collection and measurement of resistance value.As shown in figure 5, the holding wire (3 of RTD sensor
Core) be connected to RTDs thermal resistance inline diagnosis instruments after, RTD measurement analysis software control data acquisition system simulation output lead to
Road AO1 output control voltages so that program controlled constant current source output current (I), electric current pass to RTD sensings through 1 and the 2 of holding wire
Device.
The analog input channel AI1 and AI2 of data collecting system collects voltage U12 and U13 on holding wire respectively.Its
The voltage of middle U12 includes the voltage of the voltage and RTD sensor of two holding wires, and the voltage of U13 includes the electricity of a holding wire
The voltage of pressure and RTD sensor.Therefore the voltage URTD=2*U13-U12 of RTD sensor.According to formula RRTD=URTD/I,
The resistance value of RTD sensor can be calculated.
In sum, the invention discloses a kind of thermal resistance trouble-shooter and method, thermal resistance fault diagnosis dress
Put including thermal resistance tester and portable mobile termianl, thermal resistance tester and portable mobile termianl pass through USB data line
Connection, thermal resistance tester are connected by the RTD sensor of bolometric by holding wire, and the present invention adopts thermal resistance loop step
Current-responsive time method, can not only realize traditional temperature probe diagnostic function, and can also be to the installation environment of probe
Heat conduction change, temperature probe installation site situation, the aging tendency of temperature probe provide diagnostic message, can give temperature probe
Preventative maintenance and corrective maintenance are given and are rationally effectively advised.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to.
Method proposed by the invention is exemplarily described above in association with accompanying drawing, the explanation of above example is
It is used to help understand the core concept of the present invention.For one of ordinary skill in the art, according to the thought of the present invention, concrete
Will change in embodiment and range of application, such as front-rear axle has motor to participate in hybrid power system of driving etc..
In sum, this specification content should not be construed as limiting the invention.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (7)
1. a kind of thermal resistance trouble-shooter, it is characterised in that include：Thermal resistance tester and portable mobile termianl, institute
State thermal resistance tester and the portable mobile termianl to connect by USB data line, the thermal resistance tester passes through signal
Line connects by the RTD sensor of bolometric, wherein：
The thermal resistance tester includes data collecting system and program controlled constant current source, and the thermal resistance tester is passed with the RTD
Sensor provides hardwire connection, by the program controlled constant current source, to the RTD sensor set with constant current, by the number
The voltage at the RTD sensor two ends is gathered according to acquisition system, the resistance for the RTD sensor is measured；
The portable mobile termianl built-in thermoelectric resistance measurement analysis software, receives operator by thermal resistance measurement point
By the technical parameter of bolometric described in analysis software design patterns, and it is input into described to the thermoelectricity by the technical parameter of bolometric
Resistance tester, carries out measurement, data acquisition and the data analysiss of the RTD sensor response time.
2. thermal resistance trouble-shooter according to claim 1, it is characterised in that the data collecting system is equipped with 1
Road analog output channel and 2 road analog acquisition passages.
3. thermal resistance trouble-shooter according to claim 2, it is characterised in that the analog output channel is exportable
0～10V magnitudes of voltage, for controlling the output current of the program controlled constant current source.
4. thermal resistance trouble-shooter according to claim 2, it is characterised in that the analog acquisition passage can be gathered
0～10V magnitudes of voltage, for gathering the voltage on the RTD sensor holding wire.
5. thermal resistance trouble-shooter according to claim 1, it is characterised in that the program controlled constant current source output 0～
The constant current of 100mA.
6. thermal resistance trouble-shooter according to claim 1, it is characterised in that the technology by bolometric is joined
Number includes：The POF by bolometric, model, material, environment cooling medium and it is passed through current setting value.
7. a kind of thermal resistance method for diagnosing faults, it is characterised in that be applied to thermal resistance trouble-shooter, the thermal resistance therefore
The barrier diagnostic equipment includes thermal resistance tester and portable mobile termianl, the thermal resistance tester and the Portable movable end
End is connected by USB data line, and the thermal resistance tester is connected by the RTD sensor of bolometric, the party by holding wire
Method includes：
RTD is measured the portable mobile termianl analog output channel output control of analysis software control data acquisition system
Voltage, controls the program controlled constant current source and exports constant current, and the constant current passes to the RTD sensings through the holding wire
Device；
2 road analog acquisition passages of the data collecting system collect the first voltage on holding wire and second electric respectively
Pressure, wherein, the first voltage includes the voltage of the voltage of two holding wires and the RTD sensor, the second voltage bag
Include the voltage of the voltage and the RTD sensor of a holding wire；
The portable mobile termianl calculates the resistance value of the RTD sensor according to preset formula, carries out the RTD sensor
The measurement of response time and data analysiss；
Calculate described by bolometric according to the measurement result of the RTD sensor response time and the data results
The thermal resistance step current response time of RTD sensor, stability forecast value, as measured parameter data；
To be contrasted with the measured parameter data by the technical parameter of bolometric, obtained the thermal resistance fault diagnosis knot
Really.
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| CN107063505A (en) * | 2017-02-13 | 2017-08-18 | 东北电力大学 | A kind of Portable thermal resistive energy detector |
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| CN109724205A (en) * | 2018-12-25 | 2019-05-07 | 新奥数能科技有限公司 | A method of the electric heating tube temp probe of installation air-conditioning |
| CN109974897A (en) * | 2019-04-02 | 2019-07-05 | 上海外高桥造船有限公司 | A kind of PT100 temperature alarming tester |
| CN110440955A (en) * | 2019-08-13 | 2019-11-12 | 中国核动力研究设计院 | A kind of thermal resistance conditioning module Response Time Test System |
| CN112484885A (en) * | 2020-11-06 | 2021-03-12 | 上海核工程研究设计院有限公司 | Automatic implementation method for thermal resistor in-situ response time test |
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| CN107063505A (en) * | 2017-02-13 | 2017-08-18 | 东北电力大学 | A kind of Portable thermal resistive energy detector |
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| CN109724205B (en) * | 2018-12-25 | 2021-03-02 | 新奥数能科技有限公司 | Method for installing temperature probe of electric heating pipe of air conditioner |
| CN109974897A (en) * | 2019-04-02 | 2019-07-05 | 上海外高桥造船有限公司 | A kind of PT100 temperature alarming tester |
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| CN113203501A (en) * | 2021-05-20 | 2021-08-03 | 苏州热工研究院有限公司 | Nuclear power main pump thrust pad temperature measurement probe assembly checking method |
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