WO2024050985A1 - Method and device for determining working state of cryostat model - Google Patents

Abstract

A method for determining the working state of a cryostat model, comprising: determining a steady-state temperature field of a standard cryostat model and an evaluation temperature field of a cryostat model to be evaluated (S101); determining the temperature average of a first reference comparison channel of the steady-state temperature field as a first reference temperature, and calculating first relative temperature differences respectively between temperature averages of the steady-state temperature field and the first reference temperature (S103); determining the temperature average of a second reference comparison channel of the evaluation temperature field as a second reference temperature, and calculating second relative temperature differences respectively between temperature averages of the evaluation temperature field and the second reference temperature (S104); and comparing temperature data corresponding to the same temperature sensor channels in the steady-state temperature field and the evaluation temperature field, so as to determine the working state of the cryostat model to be evaluated (S105). The working state of a cryostat model having a complex structure is identified on the basis of temperature field comparison in a spatial discrete form, and the method is suitable for temperature field analysis of vehicle-mounted cryostat models of superconducting maglev trains. Also disclosed is a device for determining the working state of a cryostat model.

Description

A method and device for determining the working state of a low-temperature and constant-temperature model

This application claims the priority of a domestic application submitted to the China Patent Office on September 5, 2022, with application number 202211077371.0 and the invention title "A method and device for determining the working state of a low-temperature constant temperature model", the entire content of which is incorporated by reference. in this application.

Technical field

The present invention relates to the technical field of low-temperature and constant-temperature models, and more specifically, to a method and device for determining the working state of a low-temperature and constant-temperature model.

Background technique

The low-temperature constant temperature model is a precision container that establishes low-temperature constant temperature conditions and is thermally insulated from the outside world by inputting a low-temperature fluid medium or connecting a low-temperature refrigerator. It can continuously provide a working environment of high vacuum, ultra-deep cooling, and strong magnetic fields for on-board superconducting coils. , is the core component of the high-temperature superconducting magnet system.

At present, the on-board low-temperature and constant-temperature model used by high-temperature superconducting maglev trains has a large number of components and a complex internal configuration, covering high vacuum, ultra-deep cold, and strong magnetic field working environments. Extremely high requirements have been put forward on its structure, functional materials, etc. Require. Because some materials that make up the low-temperature constant-temperature model are prone to mechanical ductile-brittle transition or functional failures such as component sealing and insulation when carrying ultra-low temperature working environments, such as the thermal stability attenuation of the multi-layer insulation layer covering the outer surface of the coil cavity, Or the connection failure between the flexible cold-conducting connecting piece and the cold-conducting plate causes poor cold conduction performance, etc., which ultimately leads to the risk of local quench or additional magnetic field loss in the superconducting coil. Therefore, any minor problem in any part of the low-temperature constant-temperature model will pose a huge challenge to the overall reliability and comprehensive service performance of the vehicle-mounted high-temperature superconducting magnet.

At this stage, the temperature field analysis of low-temperature constant temperature models mainly adopts the following two methods: ① Numerical simulation calculation method based on virtual prototypes, that is, using engineering software to establish a three-dimensional visual model, and using finite element analysis, boundary condition limitations or target parameter approximation and other technical means, through various methods such as background numerical calculation and image processing, and finally effectively determine the changing rules or trends of the thermal physical field of the low-temperature and constant-temperature model. ② Data acquisition and measurement method based on continuous temperature field, that is, a research method that densely arranges multiple temperature sensors at continuous positions of a low-temperature constant temperature model in advance, and uses the temperature curve formed by the data acquisition system to grasp its internal thermodynamic conditions in real time .

However, when the on-board low-temperature and constant-temperature model of the high-temperature superconducting maglev train operates normally, it is jointly affected by electromagnetic force, structural force and heat flow effect. Its internal restraint load, stress and strain conditions are complex, and there are many uncertain factors. Therefore, using The first numerical simulation calculation method cannot simulate an ideal state that is completely consistent with the actual service conditions, and there are deviations or errors in the calculation results. Moreover, the processing of boundary conditions of the low-temperature and constant-temperature model, software solver selection and fault tolerance setting, and computer hardware threads will directly affect the analysis accuracy of the temperature field. Since the vehicle-mounted low-temperature constant temperature model is affected by factors such as the intricate cooling paths and internal space limitations, it is not suitable to use the second thermal resistance sensor arrangement scheme of the continuous temperature field measurement method. In addition, the second method cannot accurately evaluate the uniformity of temperature distribution inside the low-temperature constant-temperature model, and has technical feasibility shortcomings and method integrity defects.

In summary, the numerical simulation calculation method and the continuous temperature field measurement method in the traditional solution are not suitable for the temperature field analysis of the low-temperature constant temperature model for superconducting maglev vehicles, and thus cannot effectively determine the working status of the vehicle-mounted low-temperature constant temperature model.

Contents of the invention

In view of this, the present invention discloses a method and device for determining the working state of a low-temperature constant temperature model, so as to realize the temperature field analysis of the on-board low-temperature constant-temperature model of a superconducting maglev train and thereby determine the working state of the low-temperature constant temperature model.

A method for determining the working status of a low-temperature and constant-temperature model, including:

Determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, wherein the structure, manufacturing process and arrangement of their respective internal temperature sensors of the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated The location is exactly the same;

Select a temperature sensor channel from the steady-state temperature field according to the preset reference channel selection principle as the first reference comparison channel, and select a channel corresponding to the first reference comparison channel from the evaluation temperature field As the second benchmark comparison channel;

Determine the temperature average corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate the difference between each temperature average in the steady-state temperature field and the first reference temperature. The first relative temperature difference value;

Determine the temperature average value corresponding to the evaluation temperature field of the second reference comparison channel as the second reference temperature, and calculate the second difference between each temperature average value in the evaluation temperature field and the second reference temperature respectively. Relative temperature difference;

The temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value are compared with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field and the second relative temperature difference value. The values are compared to determine whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state.

Optionally, the preset reference channel selection principle is: the fluctuation amplitude of the temperature data collected within the preset time period is less than the lower limit of the amplitude, and there is no singularity in the time domain-temperature curve formed by each of the temperature data. point, and the average value of each of the temperature data is close to the temperature at the cold head adapter device or the cold transfer connection piece.

Optionally, the standard low-temperature constant temperature model is: each temperature data obtained through each internal temperature sensor channel within the preset time has no jump temperature rise and curve slope mutation phenomenon, and based on considering the discrete space, each The temperature distribution gradient at the location conforms to the low-temperature constant temperature model of the basic laws of thermodynamics.

Optionally, determining the steady-state temperature field of the standard cryostat model and the evaluation temperature field of the cryostat model to be evaluated includes:

Calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period to obtain the respective temperature average, and combine all the temperature sensor channels in the standard low-temperature constant temperature model. The data set formed by the corresponding temperature average set is determined as the steady-state temperature field;

Calculate the average of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period to obtain the respective temperature averages, and add all temperatures in the low-temperature constant temperature model to be evaluated A data set formed by a set of temperature averages corresponding to sensor channels is determined as the evaluation temperature field.

Optionally, the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value are combined with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. The second relative temperature difference value is compared to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state, including:

Using the main line of the conductive cooling transfer path as the dividing principle, draw a first transverse histogram of the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value, wherein each group of the first A horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low-temperature constant temperature model. The abscissa of the first horizontal histogram represents the temperature, and the ordinate represents each element arranged in the standard low-temperature constant temperature model. Temperature sensor channel;

Draw a second transverse histogram of the temperature average corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value, wherein each set of the second transverse histogram represents the low temperature constant temperature to be evaluated. The temperature comparison of a main line of the conductive cooling path in the model, the abscissa of the second transverse histogram represents the temperature, and the ordinate represents each temperature sensor channel arranged in the low-temperature constant temperature model to be evaluated;

Comparing each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, it is determined that the low-temperature constant temperature model to be evaluated is Normal working status or abnormal working status.

Optionally, compare each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field to determine the The low-temperature and constant-temperature model to be evaluated is in normal or abnormal working status, including:

If the change trend of each second transverse histogram in the evaluation temperature field is similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then it is determined from the perspective of discrete space temperature field analysis. The low-temperature and constant-temperature model to be evaluated is in normal working condition;

If the changing trends of each second transverse histogram in the evaluation temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then The discrete space temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.

A device for determining the working state of a low-temperature and constant-temperature model, including:

A temperature field determination unit is used to determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, wherein the structure and manufacturing process flow of the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated are and the layout positions of their respective internal temperature sensors are exactly the same;

A reference channel selection unit is used to select a temperature sensor channel from the steady-state temperature field according to a preset reference channel selection principle as a first reference comparison channel, and select a temperature sensor channel from the evaluation temperature field that is consistent with the first reference channel. The channel corresponding to the comparison channel serves as the second reference comparison channel;

The first reference temperature selection unit is used to determine the temperature average value corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate each temperature average value in the steady-state temperature field. The first relative temperature difference values from the first reference temperature respectively;

The second reference temperature selection unit is used to determine the temperature average value corresponding to the evaluation temperature field of the second reference comparison channel as the second reference temperature, and calculate the respective temperature average values in the evaluation temperature field and the second relative temperature difference value of the second reference temperature;

A working state determination unit configured to compare the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. Compare with the second relative temperature difference value to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state.

Optionally, the temperature field determination unit includes:

The steady-state temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period, obtain the respective temperature average values, and calculate the The data set formed by the temperature average set corresponding to all temperature sensor channels in the standard low-temperature constant temperature model is determined as the steady-state temperature field;

The evaluation temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period, obtain the respective temperature average values, and calculate the average temperature data. A data set formed by a set of temperature averages corresponding to all temperature sensor channels in the low-temperature and constant-temperature model to be evaluated is determined as the evaluation temperature field.

Optionally, the working status determination unit includes:

The first histogram drawing subunit is used to draw the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first lateral direction of the first relative temperature difference using the main line of the conductive cooling transfer path as the dividing principle. Histogram, wherein each group of the first horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low temperature constant temperature model, the abscissa of the first horizontal histogram represents the temperature, and the ordinate represents the layout Each temperature sensor channel in the standard cryostat model;

The second histogram drawing subunit is used to draw a second transverse histogram of the temperature average corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value, wherein each group of the second The horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the low-temperature constant temperature model to be evaluated. The abscissa of the second horizontal histogram represents the temperature, and the ordinate represents the temperature arranged in the low-temperature constant temperature model to be evaluated. Each temperature sensor channel;

A comparison subunit configured to compare each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, and determine the Describe whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state.

Optionally, the comparison subunit is specifically used for:

If the change trend of each second transverse histogram in the evaluation temperature field is similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then it is determined from the perspective of discrete space temperature field analysis. The low-temperature and constant-temperature model to be evaluated is in normal working condition;

If the changing trends of each second transverse histogram in the evaluation temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then The discrete space temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.

It can be seen from the above technical solution that the present invention discloses a method and device for determining the working state of a low-temperature constant temperature model, which determines the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated. The standard low-temperature constant temperature model and The structure, manufacturing process and layout of the respective internal temperature sensors of the low-temperature and constant-temperature models to be evaluated are exactly the same. From the steady-state temperature field, a temperature sensor channel is selected as the first benchmark comparison channel according to the preset reference channel selection principle, and from Select the channel corresponding to the first reference comparison channel in the evaluated temperature field as the second reference comparison channel, determine the average temperature corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate The first relative temperature difference between each temperature average in the steady-state temperature field and the first reference temperature is determined as the second reference temperature by the temperature average corresponding to the evaluation temperature field of the second reference comparison channel, and the evaluation temperature field is calculated The second relative temperature difference value between each temperature average value in and the second reference temperature respectively, and the temperature average value and the first relative temperature difference value corresponding to each temperature sensor channel in the steady-state temperature field correspond to the same temperature sensor channel in the evaluation temperature field Compare the temperature average value with the second relative temperature difference value to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state. When determining the working status of the low-temperature constant temperature model to be evaluated, the present invention selects a standard low-temperature constant temperature model that is exactly the same as its structure, manufacturing process flow and the arrangement position of its respective internal temperature sensor. In view of the steady-state temperature field of the standard low-temperature constant temperature model and To evaluate the temperature field of the low-temperature and constant-temperature model to be evaluated, temperature field comparison based on spatial discrete form is used to identify the working status of the low-temperature and constant-temperature model with complex structure. It can be applied to superconductivity without the need to use theoretical formula analysis or multi-field coupling simulation calculations. The temperature field analysis of the maglev train's on-board low-temperature and constant-temperature model can effectively determine its working status.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the disclosed drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the key components of a low-temperature constant temperature model used in a superconducting maglev train disclosed in an embodiment of the present invention;

Figure 2 is a flow chart of a method for determining the working state of a low-temperature and constant-temperature model disclosed in an embodiment of the present invention;

Figure 3(a) is a schematic layout diagram of a cold guide plate and its surrounding area temperature collection points (part) disclosed in the embodiment of the present invention;

Figure 3(b) is a schematic plan view of a cold guide plate and its surrounding area structure disclosed in the embodiment of the present invention;

Figure 4 is a flow chart of induction and classification of related temperature sensor channels disclosed in the embodiment of the present invention;

Figure 5(a) is a histogram of a steady-state temperature field disclosed in the embodiment of the present invention;

Figure 5(b) is a histogram of a temperature field to be evaluated disclosed in the embodiment of the present invention;

Figure 6 is a schematic structural diagram of a device for determining the working state of a low-temperature and constant-temperature model disclosed in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

For ease of understanding, refer to Figure 1. The present invention discloses a schematic diagram of the key components of a vehicle-mounted low-temperature constant temperature model used in superconducting maglev trains. The low-temperature constant temperature model mainly includes: outer cavity vacuum chamber 1, inner cavity coil cavity 2, main Support device 3, suspension frame connection seat 4, conductive cooling structure 5, refrigeration device 6, excitation device 7, heat sink device 8 and high temperature superconducting coil 9. Among them, the inner cavity coil cavity 2, the conductive cooling structure 5, the heat sink device 8 and the high-temperature superconducting coil 9 are completely placed inside the outer cavity vacuum chamber 1; the refrigeration device 6, the excitation device 7 and the main support device 3 are located outside. Between the cavity vacuum chamber 1 and the external environment; the suspension frame connection seat 4 is completely in the external environment. The excitation device 7 first passes through the heat sink device 8 and then is connected to the high-temperature superconducting coil 9; the refrigeration device 6 first passes through the cooling structure 5 and then is connected to the inner cavity coil cavity 2. The inner cavity coil cavity 2 is in direct contact with the high-temperature superconducting coil 9, but does not form a direct contact relationship with the outer cavity vacuum cavity 1.

In the low-temperature constant temperature model shown in Figure 1, there are two sets of high-temperature superconducting coils 9 (respectively No. 1 and No. 2), which are connected in series and reasonably matched and installed inside the inner cavity coil cavity 2 to provide Magnetic fields required for levitation, drive and guidance.

The inner cavity coil cavity 2 is a low-temperature cavity, and the outer surface is covered with multiple layers of insulation layers to minimize the adverse impact of radiation heat exchange heat flow on the coil. The outer cavity vacuum chamber 1 is a room temperature cavity, with a moderate gap left between the outer cavity vacuum chamber 2 and the inner cavity coil cavity 2. The two form a Dewar structure, which lays favorable conditions for creating a high vacuum insulation environment by weakening the convection heat transfer effect.

The main support device 3 is used to carry the Lorentz force exerted by the coil and transmit it to the vehicle body. It is an important structural component of the mechanical part. One end of the device is connected to the inside of the superconducting coil in a cold state of about 35K, and the other end is connected to the side beam of the suspension frame at normal temperature, forming a huge heat leakage thermal bridge, which is the main source of heat leakage in the coil cavity 2.

Two sets of high-temperature superconducting coils 9 share a conductive cooling structure. The conductive cooling structure 5 is a complex connection medium that can transmit bidirectionally (cooling in the forward direction and heat flow in the reverse direction) or exchange energy between the high-temperature superconducting coil 9 area and the refrigeration device 6, and the operating temperature limit can be below 20K.

The excitation device 7 is used to charge two sets of high-temperature superconducting coils 9 to generate a magnetomotive force that meets the target magnetic field; the heat sink device 8 uses the cold medium to control the Joule heat generation and conductive heat leakage of the current leads to avoid internal cavity coils Cavity 2 deviates from the superconducting operating temperature zone.

All the many components that serve the low-temperature constant temperature model for cooling or heat transfer and can ensure that the low-temperature constant temperature model performs its inherent functions, such as the oxygen-free high-purity copper blocks attached around the high-temperature superconducting coil 9, etc., according to functional attributes or design requirements , Use reliable low-temperature bolt connections or low-temperature sealing structures and materials at all locations that may cause abnormal cold (or heat transfer) in the low-temperature constant-temperature model or prevent it from maintaining a vacuum or low-temperature environment to ensure that the low-temperature constant-temperature model has sufficient strength and good performance. usage performance.

First of all, it needs to be explained that before determining the working status of the low-temperature and constant-temperature model, it is necessary to clarify the internal design structure of the low-temperature and constant-temperature model. See Figure 1 for details. Determine the overall assembly process of the low-temperature constant-temperature model and the specific locations where heat leakage and failure are prone to occur.

In this embodiment, when determining the working state of the low-temperature and constant-temperature model, it is executed after closing the low-temperature and constant-temperature model cavity. Among them, before closing the cryogenic and constant temperature model cavity, it is necessary to fully consider the location of each mechanism inside the cryogenic and constant temperature model and the functions they play. According to the estimated cold transmission path, the PT100 thermal resistance temperature sensor is placed at an important and reasonable position in the low-temperature constant temperature model.

In practical applications, the temperature sensors arranged at each position form independent collection channels without interference with each other. The specific operation method is: first spread the two-component adhesive evenly on the pre-arranged temperature sensor area; use quick-drying glue to firmly adhere the temperature sensor to the aluminum sheet with good thermal conductivity to increase the contact area with the surface to be measured. , and press it on the surface of the two-component adhesive; after the reagent is completely solidified, the temperature sensor channel is installed.

Based on the various structural properties and different heat conduction forms within the low-temperature constant temperature model, several main lines of the conductive cooling transfer path are determined, and the various temperature sensor channels arranged are classified. At the same time, based on the time sequence of cold energy transmission in the spatial domain, the arrangement sequence of each temperature sensor channel inside each main line is defined.

After closing the low-temperature and constant-temperature model cavity, a combination of software and hardware is used to realize real-time measurement of the temperature data collected by the temperature sensor. The specific method is as follows: connect the external leads of the temperature sensor one by one to the hub of the acquisition board in the hardware level of the data acquisition system, and use a multi-range multimeter to detect the reliability of the line connection between the sensor end and the hub end. The acquisition board is responsible for summarizing the data of each temperature sensor channel and transmitting it to the data acquisition software in the form of a bus. The background of the acquisition software can monitor and arrange it in a low-temperature and constant-temperature model through various technical means such as interpolation processing and electrical signal conversion. The change data of the temperature sensors in each discrete space inside are output in real time in the form of a single time domain curve, and are finally integrated and displayed in the human-computer interaction interface.

Embodiments of the present invention disclose a method and device for determining the working status of a low-temperature constant temperature model. When determining the working status of a low-temperature constant temperature model to be evaluated, a model with the same structure, manufacturing process and layout position of each internal temperature sensor is selected. The standard low-temperature constant temperature model is based on the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated. The temperature field comparison based on the spatial discrete form is used to identify the working status of the low-temperature constant temperature model with complex structure. There is no need to use Theoretical formula analysis or multi-field coupling simulation calculation can be applied to the temperature field analysis of the on-board low-temperature constant temperature model of the superconducting maglev train, and thus can effectively determine its working status.

Referring to Figure 2, there is a flow chart of a method for determining the working state of a low-temperature and constant-temperature model disclosed in an embodiment of the present invention. The method includes:

Step S101: Determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated;

Among them, the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated have exactly the same structures, manufacturing processes, and layout positions of their respective internal temperature sensors.

In practical applications, the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated each correspond to a data acquisition device to collect temperature data.

It should be noted that the steady-state temperature field refers to the temperature field formed when the partial derivative of the temperature of each channel with respect to time is close to zero or the slope of the temperature dynamic curve fluctuates weakly within a certain time range. It is also called the standard temperature field.

In this embodiment, the steady-state temperature field includes: the average calculated value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within a preset time period. Similarly, the evaluated temperature field includes: the average calculated value of all temperature data collected by each temperature sensor channel in the low-temperature and constant-temperature model to be evaluated within a preset time period. The value of the preset time period is determined based on actual needs, such as 72 hours. , the present invention is not limited here.

The standard low-temperature constant temperature model in this embodiment is: each temperature data obtained through each internal temperature sensor channel within the preset time has no jump temperature rise and sudden change in curve slope, and based on considering the discrete space, each position The temperature distribution gradient is a low-temperature constant temperature model that conforms to the basic laws of thermodynamics.

In practical applications, combined with the dynamic temperature curve of each sensor displayed on the acquisition system interface, and based on the structure, manufacturing process and layout of the respective internal temperature sensors, the response formed by two low-temperature and constant-temperature models during the long-term tracking test process characteristic. For one of the low-temperature and constant-temperature models, if the temperature data obtained by the sensor inside it does not have a jump temperature rise or a sudden change in the slope of the curve within a preset time period, and based on considering the discrete space, the temperature distribution gradient at each location conforms to thermodynamics. If the basic rules are met, the low-temperature constant temperature model is determined as the standard low-temperature constant temperature model, and the other low-temperature constant temperature model is determined as the low-temperature constant temperature model to be evaluated.

Step S102: Select a temperature sensor channel from the steady-state temperature field according to the preset reference channel selection principle as the first reference comparison channel, and select a temperature sensor channel corresponding to the first reference comparison channel from the evaluation temperature field. The corresponding channel serves as the second benchmark comparison channel;

Among them, the preset reference channel selection principle is: the fluctuation amplitude of the temperature data collected within the preset time period is less than the lower limit of the amplitude, the time domain-temperature curve formed by each of the temperature data does not have singular points, and each of the temperature data has no singular points. The average value of the temperature data is close to the temperature at the cold head adapter or cold connection.

The lower limit value of the amplitude can be selected as a number close to 0, so that the fluctuation amplitude of the temperature data collected by the selected first reference comparison channel within the preset time period is extremely small and can basically be ignored.

Step S103: Determine the temperature average value corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate the difference between each temperature average value in the steady-state temperature field and the first reference temperature. The first relative temperature difference value of the reference temperature;

The present invention uses the first reference temperature as the benchmark data in the steady-state temperature field to reflect the relative temperature difference between the first reference temperature in the standard low-temperature constant temperature model and the temperature average of the temperature sensor channels other than the first reference comparison channel or Temperature gradient change trend.

Step S104: Determine the temperature average value corresponding to the evaluation temperature field of the second reference comparison channel as the second reference temperature, and calculate the difference between each temperature average value in the evaluation temperature field and the second reference temperature respectively. The second relative temperature difference value;

The present invention uses the second reference temperature as benchmark data in the evaluation temperature field to reflect the relative temperature difference between the second reference temperature in the low-temperature constant temperature model to be evaluated and the temperature average of the temperature sensor channels other than the second reference comparison channel or Temperature gradient change trend.

Step S105: Compare the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field and the first relative temperature difference value. Compare the two relative temperature difference values to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state.

In practical applications, when the temperature average value and the first relative temperature difference value corresponding to each temperature sensor channel in the steady-state temperature field are compared with the change of the temperature average value and the second relative temperature difference value corresponding to the same temperature sensor channel in the evaluation temperature field When the trends are similar, it is determined that the low-temperature and constant-temperature model to be evaluated is in a normal working state; otherwise, the low-temperature and constant-temperature model to be evaluated is determined to be in an abnormal working state.

When the low-temperature and constant-temperature model to be evaluated is in an abnormal working state, it indicates that there is a local or overall problem with the low-temperature and constant-temperature model to be evaluated (generally poor internal interface contact or structural functional failure). Figure 1 can be used to determine the specific cause of the failure. area or spatial location, and formulate targeted repair and maintenance plans.

In summary, the present invention discloses a method for determining the working state of a low-temperature constant temperature model, determining the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated. The structure, manufacturing process and the layout of each internal temperature sensor are exactly the same. From the steady-state temperature field, a temperature sensor channel is selected as the first benchmark comparison channel according to the preset reference channel selection principle, and a temperature sensor channel is selected from the evaluation temperature field. The channel corresponding to the first reference comparison channel is used as the second reference comparison channel. The average temperature corresponding to the steady-state temperature field of the first reference comparison channel is determined as the first reference temperature, and the steady-state temperature field is calculated. The first relative temperature difference between each temperature average and the first reference temperature is determined. The temperature average corresponding to the second reference comparison channel in the evaluation temperature field is determined as the second reference temperature, and each temperature average in the evaluation temperature field is calculated. The second relative temperature difference value from the second reference temperature is the sum of the temperature average value and the first relative temperature difference value corresponding to each temperature sensor channel in the steady-state temperature field and the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. The second relative temperature difference value is compared to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state. When determining the working status of the low-temperature constant temperature model to be evaluated, the present invention selects a standard low-temperature constant temperature model that is exactly the same as its structure, manufacturing process flow and the arrangement position of its respective internal temperature sensor. In view of the steady-state temperature field of the standard low-temperature constant temperature model and To evaluate the temperature field of the low-temperature and constant-temperature model to be evaluated, temperature field comparison based on spatial discrete form is used to identify the working status of the low-temperature and constant-temperature model with complex structure. It can be applied to superconductivity without the need to use theoretical formula analysis or multi-field coupling simulation calculations. The temperature field analysis of the maglev train's on-board low-temperature and constant-temperature model can effectively determine its working status.

To further optimize the above embodiment, step S101 may specifically include:

Calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period to obtain the respective temperature average, and combine all the temperature sensor channels in the standard low-temperature constant temperature model. The data set formed by the corresponding temperature average set is determined as the steady-state temperature field;

Calculate the average of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period to obtain the respective temperature averages, and add all temperatures in the low-temperature constant temperature model to be evaluated A data set formed by a set of temperature averages corresponding to sensor channels is determined as the evaluation temperature field.

The value of the preset time period is determined based on actual needs, such as 72 hours, which is not limited by the present invention.

To further optimize the above embodiment, step S105 may specifically include:

Using the main line of the conductive cooling transfer path as the dividing principle, draw a first transverse histogram of the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value;

Draw a second transverse histogram of the temperature average value corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value;

Comparing each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, it is determined that the low-temperature constant temperature model to be evaluated is Normal working status or abnormal working status.

In this embodiment, each set of the first transverse histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low temperature constant temperature model. The abscissa of the first transverse histogram represents the temperature, and the ordinate represents the layout. In each temperature sensor channel in the standard low-temperature constant temperature model, each temperature sensor channel is composed of two upper and lower bar graphs. The upper bar represents the periodic temperature average of the temperature sensor channel, and the lower bar represents the temperature sensor. The first relative temperature difference value of the channel and the first reference is compared with the average temperature of the channel.

Each set of second transverse histograms represents the temperature comparison of a main line of the conductive cooling path in the low-temperature constant temperature model to be evaluated. The abscissa of the second transverse histogram represents the temperature, and the ordinate represents the temperature arranged in the low-temperature constant temperature model to be evaluated. Evaluate each temperature sensor channel in the low-temperature constant temperature model. Each temperature sensor channel consists of two upper and lower bar graphs. The upper bar represents the periodic temperature average of the temperature sensor channel, and the lower bar represents the relationship between the temperature sensor channel and the first. The two references compare the second relative temperature difference value of the channel temperature average value.

In practical applications, the main line of the conductive cooling transfer path is used as the dividing principle, and digital tools are used to draw multiple sets of first transverse histograms of the steady-state temperature field and multiple sets of second transverse histograms for evaluating the temperature field.

Among them, each first transverse histogram in the steady-state temperature field is compared with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field to determine whether the low-temperature constant temperature model to be evaluated is in a normal operating state or abnormal operation. status, specifically including:

If the changing trends of each of the second transverse histograms in the evaluated temperature field are similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then the The low-temperature and constant-temperature model to be evaluated is in normal working condition;

If the changing trends of each of the second transverse histograms in the evaluated temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then from the discrete space The temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.

In practical applications, each group of first transverse histograms of the steady-state temperature field and the second transverse histogram of the evaluation temperature field are compared and analyzed one by one, that is, only the steady-state temperature field and the evaluation temperature field in the same group are compared each time. Data regularity of each sensor channel.

If the average temperature of each sensor channel in the evaluated temperature field and the change pattern of the second reference temperature are similar to the change trend of the corresponding channel in the steady-state temperature field, it can be explained from the perspective of discrete space temperature field analysis that the low-temperature constant temperature model to be evaluated is in the normal state. working status.

If the temperature difference between the average temperature of one or more sensor channels in the evaluated temperature field and the second reference temperature shows a change trend that is significantly different from that in the steady-state temperature field or does not conform to the laws of thermodynamics, it means that the low-temperature constant temperature model to be evaluated is If there is a local or overall problem (generally poor internal interface contact or structural functional failure), it is necessary to determine the specific area or spatial location where the problem occurs based on Figure 1, and formulate a targeted repair and maintenance plan.

In summary, it can be seen that the temperature field formed by the method for determining the working state of the low-temperature and constant-temperature model disclosed in the present invention is in a spatially discrete form, and is suitable for evaluation and analysis of large-scale low-temperature and constant-temperature models with complex structures such as those used in high-temperature superconducting maglev trains. Through reverse thinking, various possible causes of superconducting magnet failures or abnormal responses can be found intuitively, accurately and conveniently without using theoretical formula analysis or multi-field coupling simulation calculations, which is highly practical. This method can also be used to study the regular characteristics of the temperature field at different time periods to achieve the technical goal of exploring the complex thermodynamic mechanism inside the on-board low-temperature and constant-temperature model of the superconducting maglev train.

Taking the low-temperature constant temperature model of a certain superconducting maglev engineering test sample vehicle as the research object, the low-temperature constant temperature model discrete temperature field analysis method proposed by the present invention is used to analyze the fault occurrence points of the low-temperature constant temperature model cold plate and its surrounding areas under service conditions. analysis of the exploration process.

In this embodiment, the two vehicle-mounted low-temperature and constant-temperature entity models involved are exactly the same to ensure the accuracy and reliability of temperature field assessment.

Figure 3a is a schematic diagram of the layout of the temperature collection points (parts) of the cold guide plate and its surrounding area. There are 9 in total, and the collection channel numbers are #1-#9. The data collected on the backside of the cold-conducting copper strip (channel #0, not marked in the figure) in the inner cavity coil cavity is used as a comparison benchmark.

The lower cover side of the cold guide plate and its surrounding area shown in Figure 3b is divided into the surface of the cold head adapter (#1), the position near the flexible cold guide adapter (#2), and the bottom of the cold guide plate near the cold head. A total of 5 locations are arranged: area (#3), center area of the cold guide plate (#4), and top area of the cold guide plate at the far cooling head end (#5).

The upper cover side of the cold guide plate and its surrounding area shown in Figure 3b is divided into the straight edge positions (#6, #8) of the No. 1 superconducting coil and the No. 2 superconducting coil, and the No. 1 superconducting coil and the No. 2 superconducting coil. A total of 4 positions of superconducting coil arc transition sections (#7, #9) are arranged.

Figure 4 summarizes the classification of the temperature sensors involved. The layout positions of the thermal resistance temperature sensors of the low-temperature and constant-temperature model of the high-temperature superconducting maglev train and its surrounding areas include: the surface of the cold head adapter (#1), near the flexible cold-conducting connector (#2), and the cold-conducting plate area as well as the superconducting coil area. Among them, the cold guide plate area can be expanded to the bottom area of the cold guide plate near the cold head (#3), the center area of the cold guide plate (#4), and the top area of the cold guide plate at the far cooling head end (#5); Superconducting The coil area consists of coil No. 1 and coil No. 2. Superconducting coil No. 1 includes: the straight line edge position (#6) and the arc transition section position (#7) of the coil. Superconducting coil No. 2 includes: the straight line inside the coil. edge position (#8) and coil arc transition section position (#9).

Under normal conditions, if the superconducting coil needs to be cooled from normal temperature to an ultra-cold environment, the temperature of the cold head adapter should be the first to start to decrease after the cryogenic refrigerator is operated. Compared with the No. 2 superconducting coil, the spatial distance between the cold head and the No. 1 superconducting coil is closer. When the cold energy is transferred to the cold conductive plate through the flexible cold conductive connector, each area of the cold conductive plate will follow the The change in the distance between the cold heads forms a temperature gradient, but it will not differ too much under continuous cooling conditions. The superconducting coil is installed inside the coil cavity, so the function of the cold plate is to maintain the cold state of the coil area, absorb excess heat in the coil cavity, and prevent the cold storage material from undergoing phase change, causing the superconducting coil to heat up and exit the superconducting state. . According to the first law of thermodynamics, each position of the cold plate will be slightly lower than the temperature of the two superconducting coils. The steady-state temperature field shown in Figure 5(a) is in line with the above law. Moreover, the temperature difference between each collection point and channel #0 is maintained within a small range.

However, combined with the histogram of the temperature field to be evaluated shown in Figure 5(b), it can be found that the average temperature in the central area of the cold plate (#4) is very abnormal, forming an obvious temperature gradient with the other collection locations. At this time, the cause of this phenomenon can be analyzed from different dimensions. From a thermodynamic point of view, it should be judged whether the uneven temperature distribution in the cavity is caused by abnormal fluctuations in air pressure in the low-temperature constant temperature model; from a process assembly point of view, it should be considered Technical problems in the operation during the closing process of the cavity, either due to insufficient amount of solder from the flexible cold-conducting connecting piece to the lateral contact surface of the cold-conducting plate, or due to insufficient grease applied between the coil cavity and the cold-conducting plate. It is good to exert the sealing and bonding effect.

Through the above comparative analysis of the steady-state temperature field and the temperature field to be evaluated, the abnormal phenomena in the on-board low-temperature and constant-temperature model of the high-temperature superconducting maglev train can be quickly and pointedly traced back to the various points causing the fault. Provide substantial help in solving subsequent problems and ensuring the normal service status of the superconducting magnet system.

Corresponding to the above method embodiments, the present invention also discloses a device for determining the working state of a low-temperature constant temperature model.

Referring to Figure 6, a schematic structural diagram of a device for determining the working state of a low-temperature constant temperature model disclosed in an embodiment of the present invention. The device includes:

The temperature field determination unit 201 is used to determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, wherein the structure and manufacturing process of the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated are The processes and the placement of their respective internal temperature sensors are exactly the same;

In this embodiment, the steady-state temperature field includes: the average calculated value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within a preset time period. Similarly, the evaluated temperature field includes: the average calculated value of all temperature data collected by each temperature sensor channel in the low-temperature and constant-temperature model to be evaluated within a preset time period. The value of the preset time period is determined based on actual needs, such as 72 hours. , the present invention is not limited here.

The reference channel selection unit 202 is used to select a temperature sensor channel as the first reference comparison channel from the steady-state temperature field according to the preset reference channel selection principle, and select the first reference comparison channel from the evaluation temperature field. The channel corresponding to the base comparison channel serves as the second base comparison channel;

Among them, the preset reference channel selection principle is: the fluctuation amplitude of the temperature data collected within the preset time period is less than the lower limit of the amplitude, the time domain-temperature curve formed by each of the temperature data does not have singular points, and each of the temperature data has no singular points. The average value of the temperature data is close to the temperature at the cold head adapter or cold connection.

The first reference temperature selection unit 203 is used to determine the temperature average of the first reference comparison channel corresponding to the steady-state temperature field as the first reference temperature, and calculate the average temperature of each temperature in the steady-state temperature field. The first relative temperature difference value between the value and the first reference temperature respectively;

The second reference temperature selection unit 204 is used to determine the temperature average corresponding to the second reference comparison channel in the evaluation temperature field as the second reference temperature, and calculate the respective temperature averages in the evaluation temperature field. a second relative temperature difference value from the second reference temperature;

The working state determination unit 205 is configured to compare the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. The value is compared with the second relative temperature difference value to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state.

In practical applications, when the temperature average value and the first relative temperature difference value corresponding to each temperature sensor channel in the steady-state temperature field are compared with the change of the temperature average value and the second relative temperature difference value corresponding to the same temperature sensor channel in the evaluation temperature field When the trends are similar, it is determined that the low-temperature and constant-temperature model to be evaluated is in a normal working state; otherwise, the low-temperature and constant-temperature model to be evaluated is determined to be in an abnormal working state.

When the low-temperature and constant-temperature model to be evaluated is in an abnormal working state, it indicates that there is a local or overall problem with the low-temperature and constant-temperature model to be evaluated (generally poor contact at the internal interface or structural functional failure). The specific cause of the failure can be determined based on Figure 1. area or spatial location, and formulate targeted repair and maintenance plans.

In summary, the present invention discloses a device for determining the working state of a low-temperature constant temperature model, which determines the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated. The structure, manufacturing process and the layout of each internal temperature sensor are exactly the same. From the steady-state temperature field, a temperature sensor channel is selected as the first benchmark comparison channel according to the preset reference channel selection principle, and a temperature sensor channel is selected from the evaluation temperature field. The channel corresponding to the first reference comparison channel is used as the second reference comparison channel. The average temperature corresponding to the steady-state temperature field of the first reference comparison channel is determined as the first reference temperature, and the steady-state temperature field is calculated. The first relative temperature difference between each temperature average and the first reference temperature is determined. The temperature average corresponding to the second reference comparison channel in the evaluation temperature field is determined as the second reference temperature, and each temperature average in the evaluation temperature field is calculated. The second relative temperature difference value from the second reference temperature is the sum of the temperature average value and the first relative temperature difference value corresponding to each temperature sensor channel in the steady-state temperature field and the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. The second relative temperature difference value is compared to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state. When determining the working status of the low-temperature constant temperature model to be evaluated, the present invention selects a standard low-temperature constant temperature model that is exactly the same as its structure, manufacturing process flow and the arrangement position of its respective internal temperature sensor. In view of the steady-state temperature field of the standard low-temperature constant temperature model and To evaluate the temperature field of the low-temperature and constant-temperature model to be evaluated, temperature field comparison based on spatial discrete form is used to identify the working status of the low-temperature and constant-temperature model with complex structure. It can be applied to superconductivity without the need to use theoretical formula analysis or multi-field coupling simulation calculations. The temperature field analysis of the maglev train's on-board low-temperature and constant-temperature model can effectively determine its working status.

To further optimize the above embodiment, the temperature field determination unit 201 may include:

The steady-state temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period, obtain the respective temperature average values, and calculate the The data set formed by the temperature average set corresponding to all temperature sensor channels in the standard low-temperature constant temperature model is determined as the steady-state temperature field;

The evaluation temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period, obtain the respective temperature average values, and calculate the average temperature data. A data set formed by a set of temperature averages corresponding to all temperature sensor channels in the low-temperature and constant-temperature model to be evaluated is determined as the evaluation temperature field.

To further optimize the above embodiment, the working state determination unit 205 may include:

The first histogram drawing subunit is used to draw the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first lateral direction of the first relative temperature difference using the main line of the conductive cooling transfer path as the dividing principle. Histogram, wherein each group of the first horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low temperature constant temperature model, the abscissa of the first horizontal histogram represents the temperature, and the ordinate represents the layout Each temperature sensor channel in the standard cryostat model;

The second histogram drawing subunit is used to draw a second transverse histogram of the temperature average corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value, wherein each group of the second The horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the low-temperature constant temperature model to be evaluated. The abscissa of the second horizontal histogram represents the temperature, and the ordinate represents the temperature arranged in the low-temperature constant temperature model to be evaluated. Each temperature sensor channel;

A comparison subunit configured to compare each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, and determine the Describe whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state.

Among them, the comparison subunit can be used specifically for:

If the change trend of each second transverse histogram in the evaluation temperature field is similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then it is determined from the perspective of discrete space temperature field analysis. The low-temperature and constant-temperature model to be evaluated is in normal working condition;

If the changing trends of each second transverse histogram in the evaluation temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then The discrete space temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.

It should be noted that for the specific working principles of each component in the device embodiment, please refer to the corresponding part of the method embodiment, and will not be described again here.

Finally, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or any such actual relationship or sequence between operations. Furthermore, the terms "comprises," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for determining the working state of a low-temperature and constant-temperature model, which is characterized by including:

   Determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, wherein the structure, manufacturing process and arrangement of their respective internal temperature sensors of the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated The location is exactly the same;

   Select a temperature sensor channel from the steady-state temperature field according to the preset reference channel selection principle as the first reference comparison channel, and select a channel corresponding to the first reference comparison channel from the evaluation temperature field As the second benchmark comparison channel;

   Determine the temperature average corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate the difference between each temperature average in the steady-state temperature field and the first reference temperature. The first relative temperature difference value;

   Determine the temperature average value corresponding to the evaluation temperature field of the second reference comparison channel as the second reference temperature, and calculate the second difference between each temperature average value in the evaluation temperature field and the second reference temperature respectively. Relative temperature difference;

   The temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value are compared with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field and the second relative temperature difference value. The values are compared to determine whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state.
2. The determination method according to claim 1, characterized in that the preset reference channel selection principle is: the fluctuation amplitude of the temperature data collected within the preset time period is less than the amplitude lower limit value, and each of the temperature data There is no singular point in the formed time domain-temperature curve, and the average value of each temperature data is close to the temperature at the cold head adapter device or the cold conductive connection piece.
3. The determination method according to claim 1, characterized in that the standard low temperature constant temperature model is: each temperature data obtained through each internal temperature sensor channel within the preset time has no jump temperature rise and curve slope mutation phenomenon. , and based on considering the discrete space, the temperature distribution gradient at each location is a low-temperature constant temperature model that conforms to the basic laws of thermodynamics.
4. The determination method according to claim 1, characterized in that determining the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated includes:

   Calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period to obtain the respective temperature average, and combine all the temperature sensor channels in the standard low-temperature constant temperature model. The data set formed by the corresponding temperature average set is determined as the steady-state temperature field;

   Calculate the average of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period to obtain the respective temperature averages, and add all temperatures in the low-temperature constant temperature model to be evaluated A data set formed by a set of temperature averages corresponding to sensor channels is determined as the evaluation temperature field.
5. The determination method according to claim 1, characterized in that: comparing the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value with the value in the evaluated temperature field. Compare the temperature average value corresponding to the same temperature sensor channel with the second relative temperature difference value to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state, including:

   Using the main line of the conductive cooling transfer path as the dividing principle, draw a first transverse histogram of the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value, wherein each group of the first A horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low-temperature constant temperature model. The abscissa of the first horizontal histogram represents the temperature, and the ordinate represents each element arranged in the standard low-temperature constant temperature model. Temperature sensor channel;

   Draw a second transverse histogram of the temperature average corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value, wherein each set of the second transverse histogram represents the low temperature constant temperature to be evaluated. The temperature comparison of a main line of the conductive cooling path in the model, the abscissa of the second transverse histogram represents the temperature, and the ordinate represents each temperature sensor channel arranged in the low-temperature constant temperature model to be evaluated;

   Comparing each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, it is determined that the low-temperature constant temperature model to be evaluated is Normal working status or abnormal working status.
6. The determination method according to claim 5, characterized in that: each of the first transverse histograms in the steady-state temperature field and the second corresponding to the same temperature sensor channel in the evaluation temperature field are Compare the horizontal histograms to determine whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state, including:

   If the change trend of each second transverse histogram in the evaluation temperature field is similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then it is determined from the perspective of discrete space temperature field analysis. The low-temperature and constant-temperature model to be evaluated is in normal working condition;

   If the changing trends of each second transverse histogram in the evaluation temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then The discrete space temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.
7. A device for determining the working state of a low-temperature and constant-temperature model, which is characterized by including:

   A temperature field determination unit is used to determine the steady-state temperature field of the standard low-temperature constant temperature model and the evaluation temperature field of the low-temperature constant temperature model to be evaluated, wherein the structure and manufacturing process flow of the standard low-temperature constant temperature model and the low-temperature constant temperature model to be evaluated are and the layout positions of their respective internal temperature sensors are exactly the same;

   A reference channel selection unit is used to select a temperature sensor channel from the steady-state temperature field according to a preset reference channel selection principle as a first reference comparison channel, and select a temperature sensor channel from the evaluation temperature field that is consistent with the first reference channel. The channel corresponding to the comparison channel serves as the second reference comparison channel;

   The first reference temperature selection unit is used to determine the temperature average value corresponding to the steady-state temperature field of the first reference comparison channel as the first reference temperature, and calculate each temperature average value in the steady-state temperature field. The first relative temperature difference values from the first reference temperature respectively;

   The second reference temperature selection unit is used to determine the temperature average value corresponding to the evaluation temperature field of the second reference comparison channel as the second reference temperature, and calculate the respective temperature average values in the evaluation temperature field and the second relative temperature difference value of the second reference temperature;

   A working state determination unit configured to compare the temperature average value corresponding to each temperature sensor channel in the steady-state temperature field and the first relative temperature difference value with the temperature average value corresponding to the same temperature sensor channel in the evaluation temperature field. Compare with the second relative temperature difference value to determine whether the low-temperature constant temperature model to be evaluated is in a normal working state or an abnormal working state.
8. The determination device according to claim 7, characterized in that the temperature field determination unit includes:

   The steady-state temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the standard low-temperature constant temperature model within the preset time period, obtain the respective temperature average values, and calculate the The data set formed by the temperature average set corresponding to all temperature sensor channels in the standard low-temperature constant temperature model is determined as the steady-state temperature field;

   The evaluation temperature field determination subunit is used to calculate the average value of all temperature data collected by each temperature sensor channel in the low-temperature constant temperature model to be evaluated within the preset time period, obtain the respective temperature average values, and calculate the average temperature data. A data set formed by a set of temperature averages corresponding to all temperature sensor channels in the low-temperature and constant-temperature model to be evaluated is determined as the evaluation temperature field.
9. The determination device according to claim 7, characterized in that the working state determination unit includes:

   The first histogram drawing subunit is used to draw the average temperature corresponding to each temperature sensor channel in the steady-state temperature field and the first lateral direction of the first relative temperature difference using the main line of the conductive cooling transfer path as the dividing principle. Histogram, wherein each group of the first horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the standard low temperature constant temperature model, the abscissa of the first horizontal histogram represents the temperature, and the ordinate represents the layout Each temperature sensor channel in the standard cryostat model;

   The second histogram drawing subunit is used to draw a second transverse histogram of the temperature average corresponding to each temperature sensor channel in the evaluation temperature field and the second relative temperature difference value, wherein each group of the second The horizontal histogram represents the temperature comparison of a main line of the conductive cooling path in the low-temperature constant temperature model to be evaluated. The abscissa of the second horizontal histogram represents the temperature, and the ordinate represents the temperature arranged in the low-temperature constant temperature model to be evaluated. Each temperature sensor channel;

   A comparison subunit configured to compare each first transverse histogram in the steady-state temperature field with the second transverse histogram corresponding to the same temperature sensor channel in the evaluation temperature field, and determine the Describe whether the low-temperature and constant-temperature model to be evaluated is in a normal working state or an abnormal working state.
10. The determination device according to claim 9, characterized in that the comparison subunit is specifically used for:

    If the change trend of each second transverse histogram in the evaluation temperature field is similar to the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field, then it is determined from the perspective of discrete space temperature field analysis. The low-temperature and constant-temperature model to be evaluated is in normal working condition;

    If the changing trends of each second transverse histogram in the evaluation temperature field and the first transverse histogram corresponding to the corresponding temperature sensor channel in the steady-state temperature field are significantly different or do not comply with the basic laws of thermodynamics, then The discrete space temperature field analysis angle determines that the low-temperature constant temperature model to be evaluated is in an abnormal working state.

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