Intelligent temperature control system based on optical fiber temperature measurement sensor

Abstract

The invention relates to the technical field of optical fiber temperature measurement, in particular to an intelligent temperature control system based on an optical fiber temperature measurement sensor. The optical fiber temperature measurement sensor is used for acquiring the connection temperature of a connection part between the gas insulated switchgear and the cable head and transmitting an output signal; the demodulation module is used for determining the connection temperature of the connection component; the correction module is used for correcting the measurement temperature of the optical fiber temperature measurement sensor when the optical fiber temperature measurement sensor is in the phase change state so as to secondarily determine the connection temperature of the connection component; and the control module is used for correspondingly adjusting the operation state of the gas-insulated switchgear according to the connection temperature of the connection component. The system provided by the invention can accurately monitor the connection temperature of the connection part in real time, and is provided with the control module to perform corresponding control adjustment according to different temperature conditions so as to ensure the safe and stable operation of the gas-insulated switchgear. The temperature measurement probe of the optical fiber temperature measurement sensor is coated with the phase change material layer, so that the temperature measurement probe is prevented from being damaged due to long-term high-temperature environment, and the stability of a temperature control system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber temperature measurement, and in particular to an intelligent temperature control system based on an optical fiber temperature measurement sensor. Background Art

[0002] As an indispensable part of the power system, the key components inside the gas cabinet (including contacts, busbars and cable connectors, etc.) are prone to heat accumulation during long-term operation at high current. If the heat dissipation is poor or the contact resistance is high, the temperature will rise and may induce overheating failure. Overheating will not only shorten the life of the equipment, but also accelerate the aging process of the insulation material. In severe cases, it may cause major safety accidents such as short circuits and fires. Therefore, it is very important to monitor the internal temperature of the gas cabinet in real time, so as to detect and solve the overheating problem in time, effectively prevent accidents, and ensure the stability and safe operation of the power system.

[0003] Therefore, how to accurately obtain the internal temperature of the gas cabinet through the optical fiber temperature sensor is of utmost importance to ensure the normal operation of the gas cabinet. For example, the prior art discloses an optical fiber temperature sensor applied to the gas cabinet, including an outer protective shell, the left surface of the outer protective shell is fixedly connected with a connector, the side surface of the outer protective shell is provided with a first groove, the outer surface of the connector is fixedly connected with a fixing ring, the left end of the connector is fixedly connected with a threaded structure, the outer surface of the threaded structure is threadedly connected with a sleeve, and the inside of the sleeve is fixedly connected with an optical fiber body. The optical fiber temperature sensor applied to the gas cabinet is composed of an optical fiber temperature sensor, a metal conduit and an ST coupler through a built-in optical fiber. The built-in optical fiber temperature sensor is composed of an integrated temperature sensor composed of a sensing part and an optical fiber at one end and an integral structure composed of an ST coupler at the other end. It can be directly cast in a cable socket, which can increase the withstand voltage value and avoid electromagnetic interference, and the length of the internal optical fiber can be customized.

[0004] However, in the above-mentioned technical solution of the fiber optic temperature sensor applied to the gas cabinet, when the fiber optic temperature sensor is continuously in a high temperature environment, especially when the temperature inside the gas cabinet frequently exceeds the maximum temperature limit that the fiber optic temperature sensor can tolerate, such extreme conditions will cause irreversible damage to the fiber optic temperature sensor, thereby causing deviations in the gas cabinet connection temperature information obtained by it. Furthermore, the distortion of temperature data may further cause problems in subsequent control links, and the control system may make wrong judgments, resulting in the inability to effectively adjust and control the operating state of the gas cabinet, thereby reducing the reliability of the temperature control system. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent temperature control system based on an optical fiber temperature sensor to solve the problem in the related art that when the optical fiber temperature sensor is continuously in a high temperature environment, especially when the temperature inside the inflation cabinet frequently exceeds the maximum temperature limit that the optical fiber temperature sensor can tolerate, such extreme conditions will cause irreversible damage to the optical fiber temperature sensor, thereby causing deviations in the inflation cabinet connection temperature information obtained by it. Furthermore, the distortion of temperature data may further cause problems in subsequent control links, and the control system may make wrong judgments, resulting in the inability to effectively adjust and control the operating state of the inflation cabinet, thereby reducing the reliability of the temperature control system.

[0006] To this end, the present invention provides an intelligent temperature control system based on an optical fiber temperature sensor, comprising: An optical fiber temperature sensor, used to obtain the connection temperature of the connection component between the inflatable cabinet and the cable head in the form of an optical signal and transmit an output signal; Wherein, the operating state of the optical fiber temperature sensor includes a stable state and a phase change state; A demodulation module, connected to the plurality of optical fiber temperature sensors, for receiving the plurality of output signals and demodulating them to determine the connection temperature; a correction module connected to the optical fiber temperature sensor, for correcting the measured temperature of the optical fiber temperature sensor to secondarily determine the connection temperature when the optical fiber temperature sensor is in the phase change state; A control module is connected to the demodulation module, the correction module and the inflatable cabinet, and is used to adjust the operating state of the inflatable cabinet according to the connection temperature.

[0007] The optical fiber temperature sensor comprises a temperature measuring part and an integration part; The temperature measuring unit includes a temperature measuring probe, a transmission optical fiber and a transmission interface; The temperature measuring unit is used to obtain the internal temperature of the inflatable cabinet, and transmit the internal temperature to the transmission interface via the transmission optical fiber using the optical signal; The integrated part is connected to the temperature measuring part and includes an ST coupler and a signal receiving interface; The transmission interface is connected to the receiving interface via threads; The integration unit is used to receive a plurality of the optical signals in the transmission optical fiber and combine them to form a single output signal.

[0008] One end of the temperature measuring part is the temperature measuring probe, and the other end is the transmission interface, specifically: The temperature measuring probe is integratedly connected to the transmission optical fiber, and the transmission optical fiber is integratedly connected to the transmission interface to form the temperature measuring part; Wherein, the transmission optical fiber is a multimode optical fiber; Wherein, a protruding conductive socket is arranged at the inner center of the transmission interface.

[0009] The integrated part combines the circuits to form a single output signal, specifically: The ST coupler adopts cumulative average filtering, that is, a plurality of the optical signals are accumulated and averaged to form a single output signal.

[0010] The operating state of the optical fiber temperature sensor includes the stable state and the phase change state, specifically: If the connection temperature is greater than or equal to the phase change temperature, the operating state of the optical fiber temperature sensor corresponds to the phase change state; If the connection temperature is lower than the phase change temperature, the operation state of the optical fiber temperature sensor corresponds to the stable state.

[0011] The temperature measuring probe is also coated with a phase change material layer, specifically: When the connection temperature is greater than the phase change temperature, the phase change material in the phase change material layer absorbs heat and melts from a solid state to a liquid state, so that the temperature of the temperature measuring probe is not greater than a threshold temperature; Wherein, the threshold temperature is greater than or equal to the phase change temperature.

[0012] When the connection temperature decreases from being greater than the threshold temperature to being less than the threshold temperature, the phase change material in the phase change material layer gradually cools and solidifies from a liquid state to a solid state.

[0013] The physical state of the phase change material in the phase change material layer is determined only by the connection temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

[0014] When the optical fiber temperature sensor is in the phase change state, the correction module corrects the measured temperature to determine the connection temperature again, specifically: The correction module determines the connection temperature secondarily according to the phase change latent heat, phase change coefficient and medium specific heat capacity of the phase change material layer: (1), Wherein, T' is the connection temperature determined by the correction module for the second time, Tmeasured is the measured temperature of the optical fiber temperature sensor, k is the phase change coefficient, ΔH is the phase change latent heat, c 介 is the specific heat capacity of the medium.

[0015] The control module compares the connection temperature with the corresponding standard value, specifically: If the connection temperature is greater than or equal to the first safety temperature, the control module adjusts the output power of the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; If the connection temperature is greater than or equal to the second safety temperature, the control module shuts down the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; Wherein, the second safety temperature is greater than the first safety temperature.

[0016] The beneficial effects of the present invention are: The present invention provides an intelligent temperature control system based on an optical fiber temperature sensor, which can monitor the connection temperature of the gas cabinet in real time and accurately by integrating a high-precision temperature measurement system. At the same time, the system is provided with a control module, which can make corresponding control adjustments in a timely and effective manner for different temperature conditions under the condition of accurately obtaining the connection temperature of the gas cabinet, so as to ensure the safe and stable operation of the gas cabinet. In addition, the temperature measuring probe of the optical fiber temperature sensor of the present invention is coated with a phase change material layer, which further protects the temperature measuring probe and prevents it from being damaged due to being in a high temperature environment for a long time, thereby ensuring the accuracy and reliability of the entire temperature control system, thereby effectively improving the stability of the temperature control system.

[0017] Furthermore, when the internal temperature of the phase change material layer exceeds the threshold temperature, it can absorb heat and melt, thereby reducing the temperature of the temperature measuring probe and preventing it from being damaged by high temperature. When the temperature drops below the threshold, the phase change material can solidify again and continue to provide protection for the temperature measuring probe. This mechanism enables the device to operate stably for a long time in a high temperature environment, improves its high temperature resistance, and further improves the stability of the temperature control system.

[0018] Furthermore, by protecting the temperature measuring probe from high temperature damage, the phase change material layer helps to extend the service life of the entire temperature measuring device, reduce the cost of replacement and maintenance, and improve the economy and practicality of the temperature control system.

[0019] Furthermore, by setting a correction module, the temperature measured by the optical fiber temperature sensor is corrected when it is in a phase change state, so as to determine the connection temperature of the inflatable cabinet again. This effectively solves the problem of temperature measurement deviation caused by the temperature change of the sensor itself and improves the accuracy of temperature measurement.

[0020] Furthermore, the integrated part of the present invention adopts ST coupler and cumulative average filtering technology to combine several optical signals and form a single output signal, thereby improving the stability of signal transmission and processing efficiency.

[0021] Furthermore, the transmission interface and the receiving interface are connected by threaded engagement, making the installation and removal process easier. This connection method also provides good sealing performance, preventing external factors such as dust and moisture from affecting the device, and further improving the stability of the temperature control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural block diagram of an intelligent temperature control system based on an optical fiber temperature sensor in an embodiment of the present invention; Figure 2 is a structural block diagram of an optical fiber temperature measuring sensor in an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the optical fiber temperature detector in the embodiment of the present invention; Figure 4 It is a partial enlarged structural schematic diagram of the temperature measuring probe in an embodiment of the present invention; Figure 5 is a decision block diagram of a control module in an embodiment of the present invention; Among them, 1 is a temperature measuring probe, 2 is a transmission optical fiber, 3 is a transmission interface, 4 is a receiving interface, 5 is an ST coupler, and 6 is a phase change material layer. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In order to better understand the present invention, the terms in the present invention are explained below: Combining: Combining two or more fiber optic signals into a single fiber optic signal.

[0027] Integrated connection: a fixed connection that cannot be removed or separated.

[0028] Demodulation: The process of converting the optical signal transmitted through the optical fiber into a current signal through a photoelectric detector using the photoelectric effect, and then restoring it to the original electrical signal through a decoder after amplification, filtering and further processing.

[0029] Multimode fiber: Multimode fiber (MMF) is an optical fiber that can support multiple transverse waveguide modes under given optical frequency and polarization conditions.

[0030] See also Figure 1 As shown, the intelligent temperature control system based on the optical fiber temperature sensor provided by the present invention includes: Optical fiber temperature sensor, used to obtain the connection temperature of the connection parts between the gas cabinet and the cable head in the form of optical signals and transmit output signals; Among them, the operating state of the optical fiber temperature sensor includes a stable state and a phase change state; A demodulation module, which is connected to a plurality of optical fiber temperature measurement sensors and is used to receive a plurality of output signals and demodulate to determine the connection temperature; A correction module, which is connected to the optical fiber temperature sensor, and is used to correct the measured temperature of the optical fiber temperature sensor to secondarily determine the connection temperature when the optical fiber temperature sensor is in a phase change state; The control module is connected with the demodulation module, the correction module and the inflatable cabinet, and is used to adjust the operating state of the inflatable cabinet according to the connection temperature.

[0031] In practice, the connection temperature of the above-mentioned gas cabinet specifically monitors the temperature changes of the connection part between the cable head and the gas cabinet, rather than just focusing on the overall connection temperature of the gas cabinet. This monitoring process uses professional equipment such as infrared thermal imagers and temperature sensors to capture the tiny temperature changes of the connection part during operation in real time, and generate detailed temperature data reports to promptly detect local overheating risks caused by factors such as poor contact, material aging or excessive load. Through comprehensive analysis and evaluation of the monitored temperature data, potential safety hazards can be quickly identified, and corresponding measures can be taken, such as adjusting the load, optimizing heat dissipation or replacing connection components, so as to effectively prevent the occurrence of serious faults such as fire and short circuit, and ensure the reliability and safety of power transmission.

[0032] In the above steps, this embodiment provides an intelligent temperature control system based on an optical fiber temperature sensor, which can monitor the connection temperature of the gas cabinet in real time and accurately by integrating a high-precision temperature measurement system. At the same time, the system is provided with a control module, which can make corresponding control adjustments in a timely and effective manner for different temperature conditions under the condition of accurately obtaining the connection temperature of the gas cabinet, so as to ensure the safe and stable operation of the gas cabinet. In addition, the temperature measuring probe of the optical fiber temperature sensor of the present invention is coated with a phase change material layer, which further protects the temperature measuring probe and prevents it from being damaged due to being in a high temperature environment for a long time, thereby ensuring the accuracy and reliability of the entire temperature control system, thereby effectively improving the stability of the temperature control system.

[0033] Furthermore, when the internal temperature of the phase change material layer exceeds the threshold temperature, it can absorb heat and melt, thereby reducing the temperature of the temperature measuring probe and preventing it from being damaged by high temperature. When the temperature drops below the threshold, the phase change material can solidify again and continue to provide protection for the temperature measuring probe. This mechanism enables the device to operate stably for a long time in a high temperature environment, improves its high temperature resistance, and further improves the stability of the temperature control system.

[0034] Furthermore, by protecting the temperature measuring probe from high temperature damage, the phase change material layer helps to extend the service life of the entire temperature measuring device, reduce the cost of replacement and maintenance, and improve the economy and practicality of the temperature control system.

[0035] Furthermore, by setting a correction module, the temperature measured by the optical fiber temperature sensor is corrected when it is in a phase change state, so as to determine the connection temperature of the inflatable cabinet again. This effectively solves the problem of temperature measurement deviation caused by the temperature change of the sensor itself and improves the accuracy of temperature measurement.

[0036] See also Figure 2 and Figure 3 As shown, the optical fiber temperature sensor includes a temperature measuring part and an integration part; The temperature measuring part includes a temperature measuring probe 1, a transmission optical fiber 2 and a transmission interface 3; The temperature measuring unit is used to obtain the internal temperature of the inflatable cabinet and transmit the internal temperature to the transmission interface via the transmission optical fiber 2 as an optical signal; The integration part is connected to the temperature measurement part, and includes an ST coupler 5 and a receiving interface 4; The transmission interface 3 and the receiving interface 4 are connected by threads; The integrated part is used to receive a plurality of optical signals in the transmission optical fiber 2 and combine them to form a single output signal.

[0037] In a specific embodiment, the transmission optical fiber 2 has a length of 3 m to 50 m, a bending radius of not less than 4.4 cm, and a diameter of 2 mm.

[0038] It is understandable that the length of the transmission optical fiber 2 can be set accordingly according to the size of the actual application site.

[0039] In detail, the temperature measuring probe 1 is a fluorescent material doped with rare earth ions. When excited by light of a specific wavelength, it will transition from the ground state to the excited state, and then return to the ground state by radiation transition, emitting characteristic fluorescence. As the temperature rises, the distribution of the number of ground and excited states of the rare earth ions changes, resulting in changes in parameters such as fluorescence spectrum intensity, fluorescence peak position, and fluorescence lifetime. By establishing a calibration relationship between fluorescence parameters and temperature, accurate temperature measurement can be achieved.

[0040] Furthermore, the above-mentioned ST coupler 5 is widely used in local area networks, wide area networks, optical fiber communication systems and data centers, is suitable for multi-mode optical fiber and single-mode optical fiber connection, and supports high-speed data transmission.

[0041] The integrated part of the present invention adopts ST coupler and cumulative average filtering technology to combine a plurality of optical signals and form a single output signal, thereby improving the stability of signal transmission and processing efficiency.

[0042] Furthermore, the transmission interface 3 and the receiving interface 4 are connected by threaded engagement, making the installation and removal process easier. This connection method also provides good sealing performance, preventing external factors such as dust and moisture from affecting the device, and further improving the stability of the temperature control system.

[0043] As the preferred technical solution for the intelligent temperature control system based on optical fiber temperature sensors, copper material is selected to form the transmission interface, receiving interface and raised conduction socket, mainly due to the excellent conductivity, corrosion resistance, thermal stability, high strength and wear resistance of copper. These characteristics ensure the low loss and stability of the signal during transmission, and improve the accuracy and reliability of the temperature measuring device. At the same time, copper material is easy to process and connect, and is convenient for customization and installation according to actual needs, thereby ensuring the efficient, stable and reliable operation of the temperature measuring device in the complex environment inside the inflatable cabinet.

[0044] In a specific implementation, a groove with the same depth is symmetrically arranged on the ST coupler 5 .

[0045] The groove design allows the ST coupler to provide more precise positioning when connecting to other devices or fiber connectors, ensuring that the coupler can be accurately aligned and inserted into the corresponding slot or interface, thus avoiding signal transmission problems caused by misalignment.

[0046] As a preferred technical solution for the intelligent temperature control system based on optical fiber temperature sensors, two casting points are symmetrically arranged at the same horizontal height on the outer surface of the ST coupler; the two casting points are symmetrically arranged, and any casting point is equidistant from the groove horizontally.

[0047] In a specific embodiment, the intelligent temperature control system based on the optical fiber temperature sensor of the present invention is embedded in the product when the plug is poured, and is completely embedded with the plug, without changing the original form of the plug and the cable head, and without reducing the performance of the cable head and the entire cabinet; the plug and the entire machine pre-installed with the intelligent temperature control system based on the optical fiber temperature sensor can normally pass the partial discharge test and the pressure resistance test. Preferably, the tensile strength of the pouring point should be 40 to 100N.

[0048] Please continue reading Figure 3 As shown, one end of the temperature measuring part is a temperature measuring probe 1, and the other end is a transmission interface 3, specifically: The temperature measuring probe 1 and the transmission optical fiber 2 are integratedly connected, and the transmission optical fiber 2 and the transmission interface 3 are integratedly connected to form a temperature measuring part; Wherein, the transmission optical fiber 2 is a multimode optical fiber; Among them, a raised conductive socket is arranged at the inner center of the transmission interface.

[0049] In a specific embodiment, the transmission optical fiber 2 adopts a multimode optical fiber with a larger core diameter to allow optical signals to be incident at various angles and simultaneously transmit optical signals of various propagation modes (i.e., various different paths or phases), thereby realizing the transmission of optical signals.

[0050] In a specific implementation, a protective layer is also provided, which is coated on the outer surface of the transmission optical fiber 2. The protective layer material is polytetrafluoroethylene and has a thickness of 2 mm. The exemplary optical fiber protective cover is made of polytetrafluoroethylene material, which can be used for a long time at -180 to 260°C. This material has the characteristics of acid and alkali resistance, resistance to various organic solvents, and high temperature resistance. The optical fiber protective cover is made of 2 mm polytetrafluoroethylene material, which is more suitable for casting cable joints.

[0051] The integrated circuit combines the circuits to form a single output signal: The ST coupler 5 uses cumulative average filtering to accumulate and average a number of optical signals to form a single output signal.

[0052] In practice, the ST coupler 5 uses a cumulative average filtering algorithm, which continuously samples the combined optical signal, accumulates the optical signal strengths of multiple sampling points, and calculates the average value. This process effectively reduces the random fluctuations and noise interference in the optical signal, thereby improving the signal stability and signal-to-noise ratio. The optimized single optical signal is stably output, providing a high-quality information transmission basis for subsequent further temperature control.

[0053] The operating states of the optical fiber temperature sensor include stable state and phase change state, specifically: If the connection temperature is greater than or equal to the phase change temperature, the operating state of the optical fiber temperature sensor corresponds to the phase change state; If the connection temperature is lower than the phase change temperature, the operation state of the optical fiber temperature sensor corresponds to a stable state.

[0054] See also Figure 4 As shown, the temperature measuring probe is also coated with a phase change material layer, specifically: When the connection temperature is greater than the phase change temperature, the phase change material in the phase change material layer absorbs heat and melts from a solid state to a liquid state, so that the temperature of the temperature measuring probe is not greater than a threshold temperature; The threshold temperature is greater than or equal to the phase transition temperature.

[0055] When the connection temperature decreases from a temperature greater than a threshold temperature to a temperature less than a threshold temperature, the phase change material in the phase change material layer gradually cools and solidifies from a liquid state to a solid state.

[0056] The physical state of the phase change material in the phase change material layer is determined only by the connection temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

[0057] It can be understood that the above phase change temperature is related to the phase change material selected in the phase change material layer. For example, the temperature measuring probe has a temperature measuring range of -40°C to 260°C, corresponding to the phase change material with a phase change temperature of 300°C.

[0058] It can be understood that when the above-mentioned optical fiber temperature sensor is in a stable state, the phase change material in the phase change material layer does not undergo a phase change; when in a phase change state, the phase change material in the phase change material layer undergoes a phase change, that is, changes from a solid molten state to a liquid state.

[0059] In detail, phase change materials can absorb or release a large amount of heat at a specific temperature, releasing the stored energy through the phase change process to maintain temperature stability or transfer thermal energy.

[0060] In practice, the phase change material in the phase change material layer 6 may be a metal alloy, such as a ferrite and austenite phase change material, which will transform from ferrite to austenite when heated to about 300 degrees, or vice versa when cooled. It may also be a molten salt such as sodium nitrate (NaNO3), which has a melting point of about 307°C. At this temperature, it will transform from solid to liquid and absorb a large amount of heat.

[0061] When the optical fiber temperature sensor is in a phase change state, the correction module corrects the measured temperature to determine the connection temperature again, specifically: The correction module determines the connection temperature secondarily according to the phase change latent heat of the phase change material layer, the phase change coefficient and the specific heat capacity of the medium: , Where, T' is the connection temperature determined by the correction module, Tmeasured is the measured temperature of the optical fiber temperature sensor, k is the phase change coefficient, ΔH is the latent heat of phase change, c 介 is the specific heat capacity of the medium.

[0062] It can be understood that the above phase change coefficient k is related to the thickness of the phase change material layer and the proportion of materials that have undergone phase change in the phase change material layer, and the thickness of the phase change material layer is negatively correlated with the phase change coefficient k, and the proportion of materials that have undergone phase change is positively correlated with the phase change coefficient. For example, the thickness of the phase change material layer is 2mm, the proportion of materials that have undergone phase change is 50%, and the corresponding phase change coefficient k is 1.2; the thickness of the phase change material layer is 1mm, the proportion of materials that have undergone phase change is 50%, and the corresponding phase change coefficient k is 1.35; the thickness of the phase change material layer is 1mm, the proportion of materials that have undergone phase change is 70%, and the corresponding phase change coefficient k is 1.65.

[0063] Furthermore, the phase change latent heat ΔH refers to the heat absorbed or released by a unit mass of the phase change material when it changes from one phase to another under isothermal and isobaric conditions. It can be understood that the phase change latent heat ΔH is related to the components and proportions in the phase change material.

[0064] It is understandable that, given the components and proportions of the phase change material, the above phase change latent heat ΔH can be obtained through limited experiments using existing technology, and will not be elaborated here. For example, the phase change material is composed of sodium nitrate, and the corresponding phase change latent heat ΔH is 50 kcal / kg.

[0065] It can be understood that the specific heat capacity of the medium c 介 is the average specific heat capacity of the phase change material heat transfer medium, and the heat transfer medium includes but is not limited to the contact surface between the phase change material and the phase change material layer, and the air between the phase change material layers. For example, the contact surface between the phase change material and the phase change material layer has poor heat transfer, and when air is used as the main heat transfer medium, the corresponding medium specific heat capacity c is 1.004 kJ / (kg·K).

[0066] It can be understood that the specific heat capacity of the medium c 介 The above medium specific heat capacity c is related to the actual setting mode and structure of the phase change material. It can be obtained through a limited number of experiments using existing technologies such as differential scanning calorimetry (DSC), and will not be elaborated here.

[0067] See also Figure 5 As shown, the control module compares the connection temperature with the corresponding standard value, specifically: If the connection temperature is greater than or equal to the first safety temperature, the control module adjusts the output power of the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; If the connection temperature is greater than or equal to the second safety temperature, the control module shuts down the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; The second safety temperature is greater than the first safety temperature.

[0068] It is understandable that the first safety temperature and the second safety temperature can be set arbitrarily according to the structure, material and use time of the inflatable cabinet. For example, the first safety temperature is 50°C and the second safety temperature is 70°C.

[0069] The components involved in the embodiments described in the present application can be implemented by hardware or software. The components described can also be set in a system. For example, it can be described as: a temperature measurement system includes a temperature measurement unit and a transmission unit, wherein the names of these units do not constitute a limitation on the components themselves in some cases.

[0070] The flowchart and block diagram in the accompanying drawings illustrate the system architecture, functions and operations that may be implemented according to the system and method of various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An intelligent temperature control system based on optical fiber temperature sensor, applied to the temperature control of the inflatable cabinet, characterized in that: include: An optical fiber temperature sensor, used to obtain the connection temperature of the connection component between the inflatable cabinet and the cable head in the form of an optical signal and transmit an output signal; Wherein, the operating state of the optical fiber temperature sensor includes a stable state and a phase change state; A demodulation module, connected to the plurality of optical fiber temperature sensors, for receiving the plurality of output signals and demodulating them to determine the connection temperature; a correction module connected to the optical fiber temperature sensor, for correcting the measured temperature of the optical fiber temperature sensor to secondarily determine the connection temperature when the optical fiber temperature sensor is in the phase change state; A control module is connected to the demodulation module, the correction module and the inflatable cabinet, and is used to adjust the operating state of the inflatable cabinet according to the connection temperature.

2. The intelligent temperature control system based on optical fiber temperature sensor according to claim 1 is characterized in that: The optical fiber temperature sensor comprises a temperature measuring part and an integration part; The temperature measuring unit includes a temperature measuring probe, a transmission optical fiber and a transmission interface; The temperature measuring unit is used to obtain the internal temperature of the inflatable cabinet, and transmit the internal temperature to the transmission interface via the transmission optical fiber using the optical signal; The integrated part is connected to the temperature measuring part and includes an ST coupler and a signal receiving interface; The transmission interface is connected to the receiving interface via threads; The integration unit is used to receive a plurality of the optical signals in the transmission optical fiber and combine them to form a single output signal.

3. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 2 is characterized in that: One end of the temperature measuring part is the temperature measuring probe, and the other end is the transmission interface, specifically: The temperature measuring probe is integratedly connected to the transmission optical fiber, and the transmission optical fiber is integratedly connected to the transmission interface to form the temperature measuring part; Wherein, the transmission optical fiber is a multimode optical fiber; Wherein, a protruding conductive socket is arranged at the inner center of the transmission interface.

4. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 3 is characterized in that: The integrated part combines the circuits to form a single output signal, specifically: The ST coupler uses cumulative average filtering to accumulate and average a plurality of the optical signals to form a single output signal.

5. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 4 is characterized in that: The operating state of the optical fiber temperature sensor includes the stable state and the phase change state, specifically: If the connection temperature is greater than or equal to the phase change temperature, the operating state of the optical fiber temperature sensor corresponds to the phase change state; If the connection temperature is lower than the phase change temperature, the operation state of the optical fiber temperature sensor corresponds to the stable state.

6. The intelligent temperature control system based on optical fiber temperature sensor according to claim 5 is characterized in that: The temperature measuring probe is also coated with a phase change material layer, specifically: When the connection temperature is greater than the phase change temperature, the phase change material in the phase change material layer absorbs heat and melts from a solid state to a liquid state, so that the temperature of the temperature measuring probe is not greater than a threshold temperature; Wherein, the threshold temperature is greater than or equal to the phase change temperature.

7. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 6 is characterized in that: When the connection temperature decreases from being greater than the threshold temperature to being less than the threshold temperature, the phase change material in the phase change material layer gradually cools and solidifies from a liquid state to a solid state.

8. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 7 is characterized in that: The physical state of the phase change material in the phase change material layer is determined only by the connection temperature, and the phase change material can be transformed from liquid to solid and from solid to liquid any number of times.

9. The intelligent temperature control system based on the optical fiber temperature sensor according to claim 8, characterized in that: When the optical fiber temperature sensor is in the phase change state, the correction module corrects the measured temperature to determine the connection temperature again, specifically: The correction module determines the connection temperature secondarily according to the phase change latent heat, phase change coefficient and medium specific heat capacity of the phase change material layer: （1）， Wherein, T' is the connection temperature determined by the correction module for the second time, Tmeasured is the measured temperature of the optical fiber temperature sensor, k is the phase change coefficient, ΔH is the phase change latent heat, c 介 is the specific heat capacity of the medium.

10. The intelligent temperature control system based on optical fiber temperature sensor according to claim 9, characterized in that: The control module compares the connection temperature with the corresponding standard value, specifically: If the connection temperature is greater than or equal to the first safety temperature, the control module adjusts the output power of the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; If the connection temperature is greater than or equal to the second safety temperature, the control module shuts down the inflatable cabinet to reduce the connection temperature of the inflatable cabinet; Wherein, the second safety temperature is greater than the first safety temperature.

Images