Thermostatic bath cavity structure and magnetic type surface temperature sensor calibration system

Abstract

The invention belongs to the field of thermostatic bath cavities, and provides a thermostatic bath cavity structure and a magnetic type surface temperature sensor calibration system. Wherein the thermostatic bath cavity structure comprises a stirring cavity and a working cavity which are mutually independent; connecting channels are arranged at the upper parts and the lower parts of the stirring cavity and the working cavity; a temperature sensor is arranged in each connecting channel and is used for detecting the temperature field change condition in the stirring cavity and transmitting the temperature field change condition to the controller; the top of the working cavity is connected with a sunken flange plate, a working surface is arranged in the sunken flange plate, and at least two detected sensor stations are distributed on the working surface; a stirring mechanism, a heating coil and a refrigerating coil are arranged in the stirring cavity; the controller is used for controlling the working states of the stirring mechanism, the heating coil and the refrigerating coil according to the temperature field change condition in the stirring cavity, so that the temperature field in the stirring cavity is uniformly maintained at a set temperature.

Description

Technical Field

[0001] The invention belongs to the field of thermostatic bath cavities, and in particular relates to a thermostatic bath cavity structure and a magnetic surface temperature sensor calibration system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The running-in test bench is used to monitor the temperature rise during the running-in test of the bogie gearbox to ensure the accuracy and reliability of the temperature rise monitoring system, thereby ensuring the assembly quality of the bogie gearbox. The magnetic surface temperature sensor in the running-in test bench is a core component and needs to be calibrated to improve the accuracy of the test results.

[0004] The current magnetic surface temperature sensor calibration system has the disadvantages of inconvenient operation and low calibration efficiency. The specific problems are as follows:

[0005] (1) Due to the limitations of the calibration system, only one sensor can be calibrated at a time, which cannot meet the needs of calibrating multiple magnetic surface temperature sensors at the same time;

[0006] (2) In order to ensure close contact between the magnetic surface temperature sensor and the constant temperature surface source, the sensor needs to be pressed manually during the calibration process. This calibration method has a large human influence factor, which affects the stability and reliability of the calibration process;

[0007] (3) The existing constant temperature surface source cannot meet the calibration requirements of the temperature rise monitoring system of the running-in test bench in the temperature range below room temperature. Summary of the invention

[0008] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a constant temperature chamber cavity structure and a magnetic surface temperature sensor calibration system, which can realize calibration in the full temperature range below room temperature; a magnetic flange is adopted, and the calibration process realizes automated testing, providing higher calibration efficiency and accuracy for the temperature rise monitoring system of the running-in test bench.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A first aspect of the present invention provides a constant temperature chamber structure.

[0011] A constant temperature tank cavity structure, comprising: a stirring cavity and a working cavity which are independent of each other; the stirring cavity and the working cavity are both provided with connecting channels at the upper and lower parts; the connecting channels are both provided with temperature control sensors, the temperature control sensors are connected to a controller, and the temperature control sensors are used to detect the temperature field changes in the stirring cavity and transmit them to the controller;

[0012] A sunken flange is connected to the top of the working chamber, a working surface is arranged in the sunken flange, and at least two sensor stations to be tested are arranged on the working surface; a stirring mechanism, a heating coil and a cooling coil are arranged in the stirring chamber; the controller is used to control the working status of the stirring mechanism, the heating coil and the cooling coil according to the change of the temperature field in the stirring chamber, so that the temperature field in the stirring chamber uniformly maintains the set temperature.

[0013] As an implementation method, the sunken flange is a magnetic flange.

[0014] As an implementation manner, the sensor station to be inspected is a groove structure.

[0015] As an implementation mode, the heating coil and the cooling coil are arranged in sequence from inside to outside on the outside of the stirring mechanism.

[0016] As an implementation manner, the stirring mechanism includes a driving motor and an impeller, and the impeller is arranged on the rotating shaft of the driving motor.

[0017] As an implementation mode, the working medium in the stirring chamber is heat transfer oil.

[0018] As an implementation mode, a temperature control sensor jack is also provided on the working surface of the sunken flange.

[0019] As an implementation mode, the heating coil and the cooling coil are both connected to a refrigerator, and the refrigerator is connected to a controller.

[0020] A second aspect of the present invention provides a magnetic surface temperature sensor calibration system.

[0021] A magnetic surface temperature sensor calibration system comprises: a housing, a display module and the thermostatic chamber cavity structure as described above;

[0022] The thermostatic tank cavity structure is arranged in the shell;

[0023] The display module is connected to the controller and is arranged on the housing.

[0024] As an implementation manner, at least one external port is further provided on the housing, one end of the external port is connected to the controller, and the other end of the external port is connected to an external device.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention arranges multiple sensor stations on the working surface, and can calibrate multiple magnetic surface temperature sensors at the same time. At the same time, the temperature control sensor is arranged in the connecting channel between the stirring chamber and the working chamber to detect the temperature field change in the stirring chamber, and the uniformity and stability of the working surface temperature are monitored in real time, which significantly improves the calibration efficiency and data consistency, avoids manual intervention, and improves the on-site calibration efficiency and test accuracy of the temperature rise monitoring system of the running-in test bench.

[0027] (2) The sunken flange of the present invention adopts a magnetic flange structure, which avoids manual pressing operations and manual intervention, and improves the on-site calibration efficiency and test accuracy of the temperature rise monitoring system of the running-in test bench.

[0028] (3) The present invention utilizes the coordination of a stirring mechanism, a heating coil, and a cooling coil to adjust the working states of the stirring mechanism, the heating coil, and the cooling coil according to the changes in the temperature field in the stirring chamber, so that the temperature field in the stirring chamber uniformly maintains the set temperature, effectively ensuring the uniformity and stability of the temperature field, realizing precise temperature control with the working surface temperature source, and solving the problem that the surface temperature below room temperature cannot be calibrated.

[0029] (4) The present invention automatically adjusts the speed of the driving motor according to the viscosity change of the working medium at different temperatures, thereby ensuring uniform stirring of the working medium under all working conditions. This intelligent operation reduces manual intervention and improves the level of automation in the experimental and production processes.

[0030] (5) The multiple active heat dissipation ducts constructed inside the thermostatic chamber cavity structure of the present invention can effectively reduce the internal temperature changes generated when the equipment is running, protect sensitive components, extend the service life of the equipment, and ensure the accuracy and reliability of the equipment operation.

[0031] (6) The magnetic surface temperature sensor calibration system of the present invention achieves a market-leading minimization design in terms of volume and medium capacity ratio, making the device more compact and suitable for testing environments with limited space. At the same time, without affecting the performance and efficiency of the device, it can better meet the testing activities under various working conditions.

[0032] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1is a cross-sectional view of a stirring chamber of a thermostatic bath chamber structure according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the internal structure of the thermostatic chamber according to an embodiment of the present invention.

[0036] Figure 3 It is a structural schematic diagram of a sunken flange according to an embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the flow of working medium in the thermostatic bath cavity structure according to an embodiment of the present invention;

[0038] FIG5( a ) is a grid cross-sectional view of a heating cavity after the model grid is divided according to an embodiment of the present invention;

[0039] FIG5( b ) is a grid diagram of the impeller rotation area according to an embodiment of the present invention;

[0040] FIG6( a ) is a thermal cloud diagram of a heating tube after heating from room temperature 26 degrees to 50 degrees and reaching a steady state according to an embodiment of the present invention;

[0041] FIG6( b ) is an iterative curve diagram of the entire process of heating the heating tube from room temperature 26 degrees to 50 degrees according to an embodiment of the present invention;

[0042] FIG6( c ) is a thermal cloud diagram of the heating tube after the heating tube is heated from 50 degrees to 75 degrees and reaches a steady state according to an embodiment of the present invention;

[0043] FIG6( d ) is an iterative curve diagram of the entire process of heating the heating tube from 50 degrees to 75 degrees according to an embodiment of the present invention;

[0044] FIG6( e ) is a thermal cloud diagram of the heating tube after the heating tube is heated from 75 degrees to 100 degrees and reaches a steady state according to an embodiment of the present invention;

[0045] FIG6( f ) is an iterative curve diagram of the entire process of heating the heating tube from 75 degrees to 100 degrees according to an embodiment of the present invention;

[0046] Figure 7 It is a structural schematic diagram of a magnetic surface temperature sensor calibration system according to an embodiment of the present invention.

[0047] in:

[0048] 1. Stirring chamber; 2. Working chamber; 3. Sunken flange; 4. Driving motor; 5. Impeller; 6. Heating coil; 7. Refrigeration coil; 8. Working surface; 9. Sensor station to be inspected; 10. Temperature control sensor jack; 11. Fastener; 12. Temperature control sensor; 13. Refrigerator; 14. Display module; 15. Communication port; 16. USB port; 17. Power port; 18. Handle; 19. Heat dissipation hole; 20. Power switch. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] The embodiment of the present invention provides a constant temperature tank cavity structure, comprising: a stirring chamber 1 and a working chamber 2 which are independent of each other; the upper and lower parts of the stirring chamber 1 and the working chamber 2 are both provided with connecting channels; the connecting channels are both provided with temperature control sensors 12, the temperature control sensors 12 are connected to a controller, and the temperature control sensors 12 are used to detect the temperature field changes in the stirring chamber 1 and transmit them to the controller;

[0053] The top of the working chamber 2 is connected to a sunken flange 3, and a working surface 8 is provided in the sunken flange 3. At least two sensor stations 9 are arranged on the working surface 8; the stirring chamber 1 is provided with a stirring mechanism, a heating coil 6 and a cooling coil 7; the controller is used to control the working status of the stirring mechanism, the heating coil and the cooling coil according to the temperature field changes in the stirring chamber, so that the temperature field in the stirring chamber uniformly maintains the set temperature.

[0054] In this embodiment, the sunken flange 3 is fixed to the top of the working chamber 2 by means of fasteners 11 (such as bolt structures).

[0055] The number of the sensor stations 9 to be inspected can be specifically set by those skilled in the art according to actual conditions.

[0056] It should be noted here that the models of temperature control sensors and controllers can be selected according to actual conditions and will not be described in detail here.

[0057] In this embodiment, the sunken flange 3 is a magnetic flange. This avoids manual pressing operations and manual intervention, and improves the on-site calibration efficiency and test accuracy of the temperature rise monitoring system of the running-in test bench. In addition, the high-purity nickel plate working surface with ferromagnetic properties can tightly absorb multiple magnetic surface temperature sensors at the same time, which is particularly suitable for synchronous calibration of multiple sensors.

[0058] In this embodiment, the sensor station 9 is a groove structure, which can stably fix the sensor to be tested, and ultimately improve the accuracy of the calibration data results of the sensor to be tested.

[0059] In this embodiment, the heating coil 6 and the cooling coil 7 are both connected to the refrigerator 43, and the refrigerator 43 is connected to the controller. The heating coil 6 and the cooling coil 7 are arranged on the outside of the stirring mechanism from the inside to the outside. In this way, the temperature is quickly increased by the heating coil, and the cooling coil surrounds the heating coil to ensure that a uniform temperature field is formed in the stirring chamber.

[0060] In this embodiment, the stirring mechanism includes a driving motor 4 and an impeller 5, and the impeller 5 is arranged on the rotating shaft of the driving motor 4. The driving motor 4 is installed outside the stirring chamber 1 and is connected to the impeller 5 inside through the rotating shaft to provide continuous and stable power for it. When the stirring device is started, the rotation of the impeller will cause the liquid medium in the chamber to flow, forming an effective liquid circulation, which not only helps to evenly distribute the temperature, but also promotes the heat transfer process.

[0061] In this embodiment, the working medium in the stirring chamber 1 is heat transfer oil.

[0062] In other embodiments, the working medium in the stirring chamber 1 can be specifically set according to actual conditions, which will not be described in detail here.

[0063] In a specific embodiment, a temperature control sensor plug hole 10 is also provided on the working surface of the sunken flange 3. This is conducive to the arrangement of a temperature control sensor to detect the temperature condition in the working chamber and below the working surface.

[0064] according to Figure 4 The geometric model of the thermostatic tank cavity structure is that the power of the fluid flow inside the thermostatic tank cavity structure comes from the mechanical force provided by the impeller inside the stirring cavity. The heat transfer fluid is set to low-temperature diesel (diesel-liquid), and the constant temperature surface source solid material is set to aluminum. This embodiment uses the standard k-epsilon model. The k-ε model is a widely used turbulence model for simulating various fluid flow conditions. This model includes two main equations: the turbulent kinetic energy equation (k) and the turbulent dissipation rate equation (ε).

[0065] Turbulent Kinetic Energy (k) Equation: The turbulent kinetic energy equation describes the distribution of turbulent kinetic energy in a fluid. Turbulent kinetic energy is a measure of the velocity fluctuations of a fluid and is closely related to the kinetic energy of the fluid.

[0066]

[0067] Where ρ is the fluid density, U is the fluid velocity vector, μ is the molecular viscosity, and μ t is the turbulent viscosity, σ k is the value of the turbulent Prandtl number for k, P k is the turbulent kinetic energy generation term due to the mean velocity gradient, and ε is the dissipation rate of turbulent energy.

[0068] Turbulence dissipation rate (ε) equation: The turbulence dissipation rate equation describes the rate at which turbulent kinetic energy is converted into internal energy (heat energy). The equation can be expressed as:

[0069]

[0070] Where σ ε is the value of the turbulent Prandtl number for ε. 1ε and C 2ε are empirical constants used to adjust the model to match experimental data or theoretical predictions.

[0071] k-epsilon model related parameters:

[0072] ρ=2719(kg / m 3 ),μ=0.0024(kg·m -1 ·s -1 ),C 1ε =1.44,C 2ε =1.92,σ k =1,

[0073] σ ε =1.3

[0074] Figure 5(a) shows the mesh cross-section of the heating cavity after the model is meshed. The default unit size is 2.2228e. -002 m. The fluid domain inside the heat transfer cavity is extracted by extracting the volume, and then meshing is performed. The fluid part inside the online density meter needs to be encrypted to improve the calculation accuracy. The meshing method is multi-region, and the mapped mesh type is triangle.

[0075] Boundary condition settings:

[0076] The goal of the experiment is to observe and record the temperature field distribution inside the thermostat at four different temperature set points of 50℃, 75℃ and 100℃. To achieve this goal, it is necessary to accurately control the initial temperature inside the thermostat to ensure that the system is in the desired starting state at the beginning of the experiment. In addition, in order to simulate and promote the air flow inside, the fan blade speed will be set to 100 (rad / s) in the experiment. This speed is considered to be sufficient to produce the required liquid convection inside the thermostat without causing excessive disturbances to the temperature field. The heat transfer process in the experiment will be constrained by the heat transfer coefficient K = 5 (W / (m2·K)). This heat transfer coefficient defines the heat exchange efficiency between the surface of the thermostat and the air inside it, and is a key parameter in the experiment. For a given heat transfer coefficient, it will be possible to calculate the heat flow between different parts of the box, thereby revealing the specific distribution of the temperature field inside the box at the set operating temperature. For different temperature set points, the experiments will be carried out separately, and each experiment will start from the ambient temperature reset inside the thermostat to ensure the repeatability and comparability of the data. At the same time, at each temperature point, the effects of different initial temperature conditions and fan blade speed changes on the temperature field distribution are compared to evaluate the effects of these factors on the temperature uniformity and stability inside the constant temperature chamber.

[0077] Relying on the platform and data built in the experiment, the temperature heat cloud map of the constant temperature cavity changing with time can be obtained by simulation using fluent software. Assuming that the initial external room temperature is 26 degrees, the cavity temperature is the same as the room temperature in the initial stage, and the heating tube is heated from 26 degrees to 50 degrees. After reaching steady state, its heat cloud map is shown in Figure 6 (a). The liquid medium in the stirring cavity is low-temperature oil, and the fan speed is set to 100 rad / s. According to the three dynamic simulation processes, the iterative curve diagram of the whole process can be obtained as shown in Figure 6 (b).

[0078] The temperature distribution diagram shown in Figure 6(a) shows the static temperature distribution of the constant temperature surface source system under steady-state conditions. The temperature sensor range is between 49.00 degrees and 50.00 degrees, which reflects the high uniformity of heat transfer and temperature control accuracy in the constant temperature surface source system. Under this steady-state condition, the simulation results of the constant temperature surface source system show highly accurate temperature control capabilities. The design of the system ensures effective heat transfer from the heating element to the medium, while ensuring efficient use of thermal energy by minimizing boundary effects. This is particularly important for achieving precise temperature control, especially in applications that require temperature uniformity and stability. The temperature was then heated to 75 degrees and 100 degrees to obtain steady-state thermal cloud maps, as shown in Figure 6(c) and Figure 6(e).

[0079] According to the iteration curves in Figure 6(d) and Figure 6(f), as the number of iterations increases, all calculation parameters tend to be stable. In the figure, continuity indicates the degree of mass conservation, that is, whether the mass flowing into and out of a control volume is balanced. As can be seen from the figure, the continuity residual gradually decreases from the beginning, indicating that the calculation of mass conservation gradually tends to be stable. The velocity residual represents the convergence of the velocity distribution in the flow field. During the iteration process, the velocity residual gradually decreases, indicating that the velocity field gradually tends to be stable. The residual k (turbulent kinetic energy) represents the stability of the solution of the turbulent kinetic energy equation. The residual of k decreases rapidly after the initial iteration and gradually stabilizes, indicating that the distribution of turbulent kinetic energy gradually tends to be stable. ε (turbulent dissipation rate) - The residual of ε reflects the convergence of the turbulent dissipation rate equation. Similar to the k residual, the ε residual also shows a trend of stabilizing after a rapid decrease. Energy - The energy residual refers to the convergence of the energy equation. Due to the setting of initial conditions and boundary conditions, the energy of the system has a rapid adjustment period. After reaching the peak, the energy residual decreases and eventually tends to a steady state, indicating that the energy distribution has reached stability.

[0080] In one or more embodiments, a magnetic surface temperature sensor calibration system is also provided, comprising: a housing, a display module 14 and a constant temperature chamber cavity structure as described above;

[0081] The thermostatic tank cavity structure is arranged in the shell;

[0082] The display module 14 is connected to the controller and is disposed on the housing.

[0083] In some specific implementations, at least one external port is further provided on the housing, one end of the external port is connected to the controller, and the other end of the external port is connected to an external device.

[0084] The external ports include but are not limited to a communication port 15 , a USB port 16 , and a power port 17 .

[0085] In some other embodiments, the housing is further provided with a handle 18 , a heat dissipation hole 19 and a power switch 20 .

[0086] The magnetic surface temperature sensor calibration system of this embodiment achieves a market-leading minimization design in terms of volume and medium capacity ratio, making the device more compact and suitable for test environments with limited space. At the same time, without affecting the performance and efficiency of the device, it can better meet the test activity requirements under various working conditions.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermostatic chamber structure, characterized in that: include: A stirring chamber and a working chamber are independent of each other; the upper and lower parts of the stirring chamber and the working chamber are both provided with connecting channels; a temperature control sensor is provided in each connecting channel, the temperature control sensor is connected to a controller, and the temperature control sensor is used to detect the temperature field change in the stirring chamber and transmit it to the controller; The top of the working chamber is connected to a sunken flange, a working surface is provided in the sunken flange, and at least two sensor stations to be tested are arranged on the working surface; a stirring mechanism, a heating coil and a cooling coil are provided in the stirring chamber; the controller is used to control the working status of the stirring mechanism, the heating coil and the cooling coil according to the temperature field changes in the stirring chamber, so that the temperature field in the stirring chamber uniformly maintains the set temperature.

2. The thermostatic chamber structure according to claim 1, characterized in that: The sunken flange is a magnetic flange.

3. The thermostatic chamber structure according to claim 1 or 2, characterized in that: The inspected sensor station is a groove structure.

4. The thermostatic chamber structure according to claim 1 or 2, characterized in that: The heating coil and the cooling coil are arranged in sequence on the outer side of the stirring mechanism from the inside to the outside.

5. The thermostatic chamber structure according to claim 1 or 2, characterized in that: The stirring mechanism comprises a driving motor and an impeller, and the impeller is arranged on the rotating shaft of the driving motor.

6. The thermostatic chamber structure according to claim 1 or 2, characterized in that: The working medium in the stirring chamber is heat transfer oil.

7. The thermostatic chamber structure according to claim 1 or 2, characterized in that: A temperature control sensor jack is also provided on the working surface of the sunken flange.

8. The thermostatic chamber structure according to claim 1 or 2, characterized in that: The heating coil and the cooling coil are both connected to a refrigerator, and the refrigerator is connected to a controller.

9. A magnetic surface temperature sensor calibration system, characterized in that: It comprises a housing, a display module and a thermostatic chamber structure as claimed in any one of claims 1 to 8; The thermostatic tank cavity structure is arranged in the shell; The display module is connected to the controller and is arranged on the housing.

10. The magnetic surface temperature sensor calibration system according to claim 9, characterized in that: The housing is also provided with at least one external port, one end of which is connected to the controller, and the other end of which is connected to an external device.

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