A method and device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe

Abstract

The present application provides a method and a device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe, which relates to the technical field of high-temperature heat pipes. The method includes: when the heat pipe starts to operate under a non-horizontal condition, in response to the occurrence of intermittent boiling inside the heat pipe, moving the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually moving the heating mechanism back to the original position. The device includes: a heating sleeve for heating the heat pipe, sleeved on the inclined heat pipe and capable of moving along the axial direction of the heat pipe; and a moving mechanism for controlling the movement of the heating sleeve, configured to control the corresponding movement of the heating sleeve along the axial direction of the heat pipe according to a preset control logic. Among them, the preset control logic is constructed based on the above method. The technical solution of the present application can flexibly and efficiently solve the problem of intermittent boiling of high-temperature heat pipes under non-horizontal conditions.

Description

Technical Field

[0001] This application relates to the technical field of high-temperature heat pipes, and in particular, to a method and device for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe. Background Technique

[0002] For the problem of intermittent boiling that occurs when a high-temperature heat pipe operates under non-horizontal conditions, common solutions include suppressing the intermittent boiling phenomenon by adjusting the input power, inclination angle, cooling capacity of the condensation section, and controlling the filling rate of the heat pipe itself and the type and structure of the wick.

[0003] However, these methods have certain limitations in practical applications: reducing the input power may affect the performance of the heat pipe; in some special application scenarios, the inclination angle of the heat pipe cannot be adjusted; the cooling capacity may be limited by the equipment design or working environment; and the filling rate and wick design are inherent properties during the heat pipe manufacturing process and cannot be easily changed during actual tests. Summary of the Invention

[0004] The purpose of this application is to provide a method and device for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe, which can flexibly and efficiently solve the problem of intermittent boiling of a high-temperature heat pipe under non-horizontal conditions.

[0005] This application is implemented as follows:

[0006] In a first aspect, this application provides a method for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe, including the following steps: when the heat pipe starts and operates under non-horizontal conditions, in response to intermittent boiling occurring inside the heat pipe, move the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

[0007] In some implementation manners, the liquid pool area and the non-liquid pool area of the heat pipe are determined by obtaining the temperature changes of multiple measuring points axially distributed on the heat pipe in real time, obtaining the temperature-time function expression of each measuring point, and then according to the temperature-time function expression of each measuring point.

[0008] In some implementation manners, the basis for judging that intermittent boiling occurs inside the heat pipe is that the temperatures of each measuring point show regular or irregular oscillations.

[0009] In some implementations, the steps for determining the liquid pool area and non-liquid pool area of the heat pipe include: substituting the temperature-time data of multiple measurement points axially distributed on the heat pipe obtained in real time into a preset sine mathematical expression to obtain the temperature-time function expression of each measurement point. Determining the position where the first measurement point is located as the liquid pool area of the heat pipe, and determining the position where the second measurement point is located as the non-liquid pool area of the heat pipe; wherein, the first measurement point and the second measurement point are adjacent, the first measurement point is located below the second measurement point, and at the same time, the temperature-time function expressions of the first measurement point and the second measurement point exhibit opposite phase characteristics.

[0010] In some implementations, the step of moving the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area includes: moving the heating mechanism axially along the heat pipe from the liquid pool area to the non-liquid pool area by a first preset distance. After an interval of the first preset time, control the heating mechanism to continue moving axially along the heat pipe from the liquid pool area to the non-liquid pool area by a second preset distance, or stop moving the heating mechanism according to a preset judgment mechanism; wherein, the preset judgment mechanism is established based on the change in the amplitude values corresponding to the temperature-time function expressions of each measurement point, and is used to judge whether the heat pipe reaches a predetermined working condition.

[0011] In some implementations, the step of gradually moving the heating mechanism back to the original position when the intermittent boiling phenomenon weakens includes: after the heat pipe reaches the predetermined working condition and after an interval of the second preset time, judge whether the intermittent boiling phenomenon weakens according to the change in the amplitude values corresponding to the temperature-time function expressions of each measurement point, and when it is determined that the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

[0012] In a second aspect, the present application provides a device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe, which includes: a heating sleeve for heating the heat pipe, sleeved on the inclined heat pipe and capable of moving along the axial direction of the heat pipe; and a moving mechanism for controlling the movement of the heating sleeve, for controlling the heating sleeve to move correspondingly along the axial direction of the heat pipe according to a preset control logic. Wherein, the preset control logic includes: when the heat pipe starts to operate under a non-horizontal working condition, in response to the occurrence of intermittent boiling inside the heat pipe, use the moving mechanism to move the heating sleeve so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually move the heating sleeve back to the original position.

[0013] In some implementations, the moving mechanism includes a motor, a slider, and a lead screw arranged parallel to the heat pipe. Wherein, the output shaft of the motor is connected to the end of the lead screw, the lead screw can rotate along its own central axis as the output shaft of the motor rotates, and the rotation control logic of the motor is constructed according to the preset control logic; the slider is connected to the heating sleeve, and a threaded through hole adapted to the lead screw is provided on the slider. When the lead screw rotates, the slider moves translationally along the axial direction of the lead screw to drive the heating sleeve to move along the axial direction of the heat pipe.

[0014] In some implementations, the moving mechanism further includes a guiding rod, and the slider is provided with a guiding through hole adapted to the guiding rod. The guiding rod is slidably connected to the slider through the guiding through hole.

[0015] Compared with the prior art, the present application has at least the following advantages or beneficial effects:

[0016] The present application proposes a method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe. When the heat pipe starts under non-horizontal conditions, by dynamically adjusting the position of the heating mechanism, the violent vaporization in the liquid pool area is effectively reduced, the pressure fluctuation is reduced, and the intermittent boiling that occurs when the heat pipe starts under non-horizontal conditions can be effectively suppressed. This method not only overcomes the limitations of adjusting the input power, inclination angle, cooling capacity, filling ratio, and wick design in the prior art, but also improves the adaptability and stability of the heat pipe under non-horizontal conditions. By dynamically adjusting the position of the heating mechanism, the present application can effectively suppress the intermittent boiling phenomenon without sacrificing the performance of the heat pipe, providing new possibilities for the wide application of high-temperature heat pipe technology. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a flowchart of an embodiment of a method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe according to the present application;

[0019] Figure 2 It is a temperature distribution curve of the measurement points in the evaporation section of an embodiment of a method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe according to the present application;

[0020] Figure 3 It is a temperature distribution curve of the measurement points in the evaporation section of another embodiment of a method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe according to the present application;

[0021] Figure 4 It is a schematic structural diagram of an embodiment of a device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe according to the present application.

[0022] Reference Signs: 100, heat pipe; 200, moving mechanism; 201, motor; 202, lead screw; 203, slider; 204, guiding rod; 300, heating sleeve. Detailed Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated in the drawings here can be arranged and designed in various different configurations. In this document, 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 any actual relationship or sequence between these entities or operations.

[0024] The following will describe some embodiments of this application in detail in conjunction with the accompanying drawings. Without conflict, the following various embodiments and the various features in the embodiments can be combined with each other.

[0025] To facilitate understanding of the technical solution provided by this application, some concepts will be introduced first.

[0026] 1. Intermittent boiling

[0027] The intermittent boiling of the heat pipe 100 is a complex heat transfer phenomenon. Specifically, it refers to the phenomenon of two-phase flow pattern change and temperature instability fluctuation caused by certain reasons during the evaporation and condensation processes of the working liquid inside the heat pipe 100. The specific manifestations of intermittent boiling include the flow of steam and condensate inside the same pipe. When the heat input is uneven, it will cause the liquid in some areas to evaporate rapidly to form steam, while the liquid in other areas is insufficient, thus causing flow pattern changes and temperature fluctuations. Such fluctuations will further affect the heat transfer efficiency and working stability of the heat pipe 100.

[0028] The process of intermittent boiling includes the generation, growth, rupture of bubbles, and the reflux and reheating of the liquid. The specific process is as follows: 1) Bubble generation: As the heat flux density increases, the temperature of the evaporation section tube wall rises, and the working fluid in contact with the inner wall of the evaporation section begins to generate bubbles; 2) Bubble growth: Due to the relatively high temperature of the evaporation section wall surface, the bubbles grow rapidly until they cover the entire evaporation section, flushing a large amount of liquid to the condensation section; 3) Bubble rupture: The bubbles rupture in the condensation section, and the liquid forms a liquid film on the tube wall and boils; 4) Liquid reflux: The subcooled liquid returns to the liquid pool in the evaporation section to be heated, preparing for the generation of the next bubble.

[0029] 2. Liquid pool area

[0030] The liquid pool region refers to a region at the bottom of the evaporation section of the heat pipe 100, where the liquid working fluid accumulates due to gravity or capillary force (in a capillary wick heat pipe). When the heat pipe 100 is operating, the liquid working fluid in this region absorbs heat from an external heat source, and part of the working fluid evaporates into steam. The steam then rises to the condensation section for condensation and releases heat. Since the liquid working fluid is relatively concentrated in the liquid pool region, the heat transfer in this region mainly occurs through nucleate boiling (if the heat flux density is high enough) and / or single-phase convective heat transfer. The size and position of the liquid pool region are affected by various factors such as the direction of gravity, the inclination angle of the heat pipe, the heat flux density, the properties of the working fluid, and the internal structure of the heat pipe 100 (such as the capillary wick structure).

[0031] 3. Non-liquid pool region

[0032] The non-liquid pool region refers to the part of the evaporation section of the heat pipe 100 other than the liquid pool region. In this region, the distribution of the liquid working fluid is relatively less, and it mainly covers the inner wall of the heat pipe 100 or the surface of the capillary wick in the form of a liquid film. The heat transfer in the non-liquid pool region is mainly achieved through liquid film evaporation and / or single-phase convective heat transfer. Since the distribution of the liquid working fluid is not as concentrated as in the liquid pool region, the heat transfer capacity of the non-liquid pool region may be relatively low. However, under specific conditions (such as when the heat flux density is low), nucleate boiling may also occur in the non-liquid pool region, but this is usually not the main heat transfer method. Embodiment 1

[0033] In the field of high-temperature heat pipe technology, the problem of intermittent boiling under non-horizontal conditions has always been a difficult point restricting the performance improvement of the heat pipe 100. Based on an in-depth analysis of the existing technology, the inventor discovered a series of common methods aimed at suppressing intermittent boiling, such as adjusting the input power, changing the inclination angle, enhancing the cooling capacity of the condensation section, and optimizing the filling ratio and the design of the liquid absorption core of the heat pipe 100. Although these methods can alleviate the intermittent boiling phenomenon to a certain extent, each has its own limitations that cannot be ignored. For example, reducing the input power can reduce the boiling intensity, but it sacrifices the heat transfer efficiency of the heat pipe 100; adjusting the inclination angle is limited by the actual application scenario and is often not feasible; enhancing the cooling capacity of the condensation section is limited by the equipment design and the working environment; the design of the filling ratio and the liquid absorption core, as an inherent property during the manufacturing process of the heat pipe 100, is difficult to adjust later.

[0034] Specifically, in actual engineering, heat pipe stacks often have special operating scenarios, such as being used as land-based mobile nuclear power sources, deep space, and deep sea small nuclear power sources, etc., where they operate at different inclination angles. In some specific places, due to the advantages of modularity, small size, and special safety of heat pipe stacks, they are fixed in specific positions, so their postures remain unchanged. At this time, the condition of reducing the inclination angle to reduce the intermittent boiling intensity and delay the occurrence interval of intermittent boiling does not conform to the actual situation. In addition, the cooling capacity reflects the heat transfer power of the heat pipe 100. In some specific occasions,heat pipe reactor The cooling capacity is fixed, that is, the heat transfer power is constant. At this time, the intermittent boiling phenomenon of the heat pipe 100 cannot be affected by adjusting the cooling capacity. That is, increasing the cooling capacity can suppress the intensity of the intermittent boiling of the heat pipe 100, so that the heat pipe 100 can reach the stable operation state faster. At the same time, the filling ratio and the type and structure of the wick are all inherent properties of the heat pipe 100 design and cannot be changed later.

[0035] Therefore, the embodiment of the present application provides a method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe. When the heat pipe 100 starts under non-horizontal conditions, once intermittent boiling is detected inside, the heating mechanism is immediately moved from the liquid pool area of the heat pipe 100 to the non-liquid pool area. This operation aims to change the distribution state of the working fluid in the heat pipe 100, reduce local overheating and bubble generation in the liquid pool area, and thus suppress intermittent boiling. As the intermittent boiling phenomenon weakens, the heating mechanism is gradually moved back to the original position to ensure the normal heat transfer efficiency of the heat pipe 100.

[0036] This implementation idea not only overcomes the limitations of adjusting the input power, inclination angle, cooling capacity, filling ratio, and wick design in the prior art, but also improves the adaptability and stability of the heat pipe 100 under non-horizontal conditions. That is, the present application can effectively suppress the intermittent boiling phenomenon without sacrificing the performance of the heat pipe 100 by dynamically adjusting the position of the heating mechanism, providing new possibilities for the wide application of high-temperature heat pipe technology.

[0037] Please refer to Figure 1 , the method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe includes the following steps: when the heat pipe 100 starts and operates under non-horizontal conditions, in response to intermittent boiling occurring inside the heat pipe 100, move the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe 100 to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

[0038] It should be noted that when the working fluid inside the heat pipe 100 is in a non-horizontal state, the flow of the working fluid mainly depends on the internal pressure difference and capillary action, and gravity also has a certain influence on assisting the reflux of the working fluid (the influence of gravity is relatively small). When the heat pipe 100 is placed non-horizontally or inclined, after the working fluid is heated and evaporated in the evaporation section, the vapor flows to the condensation section under the action of the pressure difference. However, during the reflux process, if there is not enough gravity to assist, the reflux speed of the working fluid will slow down, resulting in the liquid level in the evaporation section dropping and forming an air plug. As the temperature in the evaporation section increases, the volume of the air plug increases and the pressure increases. When the pressure reaches a certain value, the air plug will temporarily block the flow of the liquid, forming an intermittent boiling phenomenon. That is to say, when the heat pipe 100 starts under non-horizontal working conditions, an intermittent boiling phenomenon will occur. If intermittent boiling occurs, it will lead to a decrease in the heat transfer efficiency of the heat pipe 100 because the flow of the working fluid is discontinuous, affecting the effective transfer of heat. In addition, intermittent boiling may also cause pressure fluctuations inside the heat pipe 100, further affecting its stable operation.

[0039] In the above embodiment, when the intermittent boiling phenomenon is detected, the heating mechanism is immediately moved from the liquid pool area to a non-liquid pool area (such as the vapor area or the edge of the liquid pool). This operation aims to reduce the concentrated heating of a large amount of liquid working fluid directly, avoiding the sudden increase in pressure and unstable boiling caused by intense vaporization in the liquid pool. As the intermittent boiling phenomenon weakens, the heating mechanism is gradually moved back to the original position to restore and optimize the normal heat transfer process of the heat pipe 100. This step ensures that when the heat pipe 100 starts under non-horizontal working conditions, it can maintain a high heat transfer efficiency while reducing the negative impact of intermittent boiling.

[0040] In summary, when the heat pipe 100 starts under non-horizontal working conditions, by dynamically adjusting the position of the heating mechanism, the intense vaporization in the liquid pool area is effectively reduced, the pressure fluctuation is decreased, and the intermittent boiling that occurs when the heat pipe 100 starts under non-horizontal working conditions can be effectively suppressed. Thereby reducing the thermal stress and mechanical vibration caused by intermittent boiling, which helps to reduce the wear of the heat pipe 100 and its connecting components, and thus extends the overall service life of the equipment.

[0041] Based on the foregoing solution, in some implementation manners of the present application, the liquid pool area and the non-liquid pool area of the heat pipe 100 are determined by obtaining the temperature changes of multiple measuring points axially distributed on the heat pipe 100 in real time, obtaining the temperature-time function expression of each measuring point, and then according to the temperature-time function expression of each measuring point.

[0042] It should be noted that in the above implementation, by obtaining the temperature changes of multiple measurement points in real time and establishing a temperature-time function expression, the liquid pool area and non-liquid pool area of the heat pipe 100 can be determined more accurately. This helps to precisely control the position movement of the heating mechanism, thereby more effectively suppressing the intermittent boiling phenomenon. Among them, based on the accurate determination of the liquid pool area and non-liquid pool area, the heating strategy can be further optimized. For example, a lower heating intensity is adopted in the liquid pool area to reduce violent vaporization; in the non-liquid pool area, the heating intensity is adjusted as needed to maintain the overall thermal efficiency of the system. This optimized heating strategy helps to further improve the stability and heat transfer efficiency of the heat pipe 100.

[0043] Based on the foregoing solution, in some implementations of the present application, the basis for determining the occurrence of intermittent boiling inside the heat pipe 100 is that the temperatures of each measurement point exhibit regular or irregular oscillations.

[0044] It should be noted that the inventor's research found that when a large amount of working medium is filled into the heat pipe 100, due to the gradual increase in the heating power, the sodium working medium is periodically pushed from the evaporation section to the condensation section at a relatively high speed, and periodic heat transfer oscillations will occur in the evaporation section and the condensation section, manifested as periodic changes in the temperatures of the evaporation section and the condensation section, often accompanied by metal impact sounds in the heat pipe 100. In extreme cases, the large-amplitude mechanical vibration of the heat pipe 100 caused by intermittent boiling may damage the pipe wall, resulting in leakage and rupture of the heat pipe 100. Therefore, in the above implementation, by defining the basis for determining the occurrence of intermittent boiling inside the heat pipe 100 as the regular or irregular oscillations of the temperatures of each measurement point, not only the accuracy of monitoring is improved, but also the control measures are optimized, and the reliability of the system is enhanced.

[0045] Among them, since the temperature oscillation is a direct reflection of the state change of the working medium during the intermittent boiling process. By monitoring the temperature oscillation, the vaporization and condensation processes of the working medium inside the heat pipe 100 can be indirectly monitored, thereby accurately judging the occurrence of intermittent boiling. And temperature is a physical quantity that is easy to monitor in the heat pipe 100 system, and the temperature oscillation has obvious characteristics, which are easy to identify and judge through data processing and analysis. Furthermore, since the temperature oscillation is an immediate manifestation of intermittent boiling, the intermittent boiling phenomenon can be quickly detected by monitoring the temperature oscillation, providing the possibility for timely taking control measures.

[0046] Based on the foregoing solution, in some implementation manners of the present application, the steps for determining the liquid pool area and the non-liquid pool area of the heat pipe 100 include: substituting the temperature-time data of multiple measuring points axially distributed on the heat pipe 100 obtained in real time into a preset sine mathematical expression to obtain the temperature-time function expression of each measuring point. Determining the position where the first measuring point is located as the liquid pool area of the heat pipe 100, and determining the position where the second measuring point is located as the non-liquid pool area of the heat pipe 100; wherein, the first measuring point and the second measuring point are adjacent, and the first measuring point is located below the second measuring point, and at the same time, the temperature-time function expressions of the first measuring point and the second measuring point exhibit opposite phase characteristics.

[0047] In the above implementation manner, by introducing the sine mathematical expression and phase characteristic analysis, the temperature oscillation characteristics of different regions inside the heat pipe 100 can be more accurately described and distinguished, so as to accurately determine the positions of the liquid pool area and the non-liquid pool area. And its implementation does not depend on a complex physical model or expensive experimental equipment, but is based on the temperature data obtained in real time and simple mathematical processing, so it has strong practicability and operability. So that on the basis of accurately determining the liquid pool area and the non-liquid pool area, the position and heating intensity of the heating mechanism can be adjusted more precisely to more effectively suppress the intermittent boiling phenomenon and improve the stability and heat transfer efficiency of the heat pipe 100.

[0048] Exemplarily, assuming that after substituting the temperature-time data of multiple measuring points axially distributed on the heat pipe 100 obtained in real time into a preset sine mathematical expression, the temperature-time function expressions of each measuring point are as follows:

[0049] T 1 =A 1 sin ( 2πft + φ 1) (Expression 1)

[0050] T 2 =A 2 sin ( 2πft + φ 2) (Expression 2)

[0051] ……

[0052] Wherein, T 1 and T 2 represent the measured point temperatures, A 1 and A 2 represent the amplitudes, f represents the frequency, t represents the time, φ 1 and φ 2 represent their respective phases. The temperature-time function expressions of all measuring points have the same frequency, different amplitudes, and different phases. If △ = φ 1 - φIf 2 = π / 2, the measuring point position corresponding to Expression 1 is the liquid pool area, and the measuring point position corresponding to Expression 2 is the non-liquid pool area.

[0053] Exemplarily, as Figure 2 shown, Figure 2 This is the temperature distribution curve of the measuring points in the evaporation section of an embodiment of a method for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe in this application. Under this example, the temperatures of each measuring point oscillate regularly.

[0054] Among them, Figure 2 the vertical axis is the temperature value of the measuring point (unit: °C), Figure 2 the horizontal line 3 in Figure 2 represents the temperature of the measuring point in the liquid pool area of the measuring point temperature, that is, the measuring point temperature at the 40 cm position of the heat pipe 100 (multiple measuring points distinguished by the length interval of the heat pipe 100 in the figure). According to Figure 2 it can be seen that the position of the liquid pool area (working fluid convergence area) is 0 - 40 cm, and the heat flux density at this point is the largest (the temperature at this point is the highest). The temperature of the measuring point position in the liquid pool area and the non-liquid pool area show the characteristic of opposite phases. When the temperature in the liquid pool area is the highest, the temperature in the non-liquid pool area is the lowest (as can be seen from the vertical line 2 in Figure 2 ), and when the temperature in the liquid pool area is the lowest, the temperature in the non-liquid pool area is the highest (as can be seen from the vertical line 1 in

[0055] As Figure 3 shown, Figure 3 This is the temperature distribution curve of the measuring points in the evaporation section of another embodiment of a method for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe in this application. Under this example, the temperatures of each measuring point oscillate irregularly. Among them, Figure 3 the vertical axis is the temperature value of the measuring point (unit: °C), Figure 3 the horizontal lines 3 and 4 in Figure 3 represent the temperatures of the measuring points in the liquid pool area of the measuring point temperature, that is, the measuring point temperatures at the 70 cm and 80 cm positions of the heat pipe 100 (multiple measuring points distinguished by the length interval of the heat pipe 100 in the figure). According to

[0056] Based on the foregoing solution, in some implementation manners of the present application, the step of moving the heating position of the mobile heating mechanism from the liquid pool area of the heat pipe 100 to the non-liquid pool area includes: moving the heating mechanism along the axial direction of the heat pipe 100 from the liquid pool area to the non-liquid pool area by a first preset distance. After an interval of the first preset time, control the heating mechanism to continue to move along the axial direction of the heat pipe 100 from the liquid pool area to the non-liquid pool area by a second preset distance according to a preset judgment mechanism, or determine that the heat pipe 100 reaches a predetermined working condition to stop moving the heating mechanism; wherein, the preset judgment mechanism is established according to the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point, and is used to judge whether the heat pipe 100 reaches the predetermined working condition.

[0057] In the above implementation manner, first move the heating mechanism along the axial direction of the heat pipe 100 from the liquid pool area to the non-liquid pool area by a first preset distance. This operation aims to initially change the heating position to reduce the direct heating of the working medium in the liquid pool area, thereby suppressing the intermittent boiling phenomenon. Then, after an interval of the first preset time, control the further movement of the heating mechanism according to the preset judgment mechanism. The core of this preset judgment mechanism lies in judging whether the working condition of the heat pipe 100 is stable according to the change of the amplitude value, which helps to quickly suppress the intermittent boiling phenomenon, enable the heat pipe 100 to reach the predetermined working condition faster, and thus improve the overall stability of the system. Avoiding unnecessary movement of the heating mechanism can reduce energy consumption and wear, and extend the service life of the system.

[0058] Among them, the preset judgment mechanism is established based on the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point. The change of the amplitude value reflects the intensity of the temperature fluctuation inside the heat pipe 100 and is an important index for judging whether the working condition of the heat pipe 100 is stable. If the amplitude value continues to decrease, it indicates that the intermittent boiling phenomenon is suppressed and the working condition of the heat pipe 100 tends to be stable. At this time, the heating mechanism can be continued to move along the axial direction of the heat pipe 100 from the liquid pool area to the non-liquid pool area by a second preset distance as needed to further optimize the heat transfer efficiency. If the amplitude value no longer changes significantly or reaches below a preset threshold, it indicates that the heat pipe 100 has reached the predetermined working condition, that is, the intermittent boiling phenomenon is effectively controlled and the temperature distribution inside the heat pipe 100 tends to be uniform. At this time, the movement of the heating mechanism should be stopped to avoid energy consumption and wear caused by unnecessary adjustment.

[0059] Based on the foregoing solution, in some implementation manners of the present application, the step of gradually moving the heating mechanism back to the original position when the intermittent boiling phenomenon weakens includes: after the heat pipe 100 reaches the predetermined working condition and after an interval of the second preset time, judge whether the intermittent boiling phenomenon weakens according to the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point, and when it is determined that the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

[0060] It should be noted that in order to ensure that after the operating conditions of the heat pipe 100 are stable and the intermittent boiling phenomenon is effectively controlled, the heating mechanism can be timely and gradually moved back to its original position to maintain the long-term efficient operation of the heat pipe 100. Among them, the steps of controlling the heating mechanism to move back in the above implementation method can be refined as follows:

[0061] 1) Steady state confirmation: First, it is necessary to confirm that the heat pipe 100 has reached the predetermined operating conditions. This can be achieved by monitoring the amplitude values corresponding to the temperature-time function expressions of each measuring point. When the amplitude values are stable within a certain range or below the preset threshold, it can be considered that the heat pipe 100 is in a steady state.

[0062] 2) Time interval waiting: After confirming that the heat pipe 100 has reached the predetermined operating conditions, it is necessary to wait for a second preset time interval. This time interval is to ensure that the state of the working medium inside the heat pipe 100 has been fully stabilized, avoiding misjudgment caused by short-term fluctuations.

[0063] 3) Intermittent boiling phenomenon judgment: After waiting for the second preset time interval, judge again whether the intermittent boiling phenomenon has weakened according to the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point. This is usually achieved by comparing the current amplitude value with the previous value. If the current amplitude value is significantly smaller than the previous value, it can be considered that the intermittent boiling phenomenon has weakened.

[0064] 4) Heating mechanism movement back: After determining that the intermittent boiling phenomenon has weakened, the heating mechanism can be gradually moved back to its original position. The movement back process should be gradual to avoid drastic changes in the state of the working medium inside the heat pipe 100 caused by sudden changes in the heating position.

[0065] In short, when the intermittent boiling phenomenon weakens, the above implementation method not only improves the operating efficiency and system stability of the heat pipe 100 by timely and gradually moving the heating mechanism back to the original position, but also optimizes the energy consumption.

[0066] To enable those skilled in the art to more intuitively understand the present application, a specific example will be used to illustrate here. In this example, the method for suppressing intermittent boiling at the inclination angle of a high-temperature heat pipe includes the following steps:

[0067] Step 1: During the startup process of the heat pipe 100, increase the power at a rate of 15 W / min until intermittent boiling occurs.

[0068] Step 2: Collect the transient temperature changes of all measuring points within 2 minutes, perform data fitting, and obtain the temperature-time function expressions of each measuring point.

[0069] Step 3: Determine the liquid pool area and the non-liquid pool area. Among them, the temperature-time function expressions of all measuring points have the same frequency but different amplitudes, and the phase difference between the liquid pool area and the non-liquid pool area is π / 2. Based on this, the liquid pool area and the non-liquid pool area can be determined.

[0070] Step 4: According to the determination results of the liquid pool area and the non-liquid pool area, control the heating mechanism to move towards the non-liquid pool area.

[0071] Step 5: Determine whether the amplitude of the temperature-time function expression of the measuring point corresponding to the liquid pool area at this time is less than 5°C. If it is greater than 5°C, jump to Step 2 to re-determine the liquid pool area and the non-liquid pool area; if it is not greater than 5°C, then proceed to the next step.

[0072] Step 6: Then increase the power at a rate of 15 W / min. Each time the power is increased, determine whether the temperature change rate of all measuring points is less than 1°C / min. If it is less than 1°C / min, then proceed to the next step; otherwise, stop increasing the power at a rate of 15 W / min, keep the current power unchanged, and wait until the temperature change rate of all measuring points is less than 1°C / min and then proceed to the next step.

[0073] Step 7: Control the heating mechanism to move back to the original position, moving 1 cm each time, and determine the amplitude of the temperature-time function expression of the measuring point corresponding to the liquid pool area. When the amplitude is greater than or equal to 5°C, turn to Step 2; when the amplitude is less than 5°C, proceed to the next step.

[0074] Step 8: Then increase the power at a rate of 15 W / min. Each time the power is increased, judge the amplitude of all measuring points, and increase the power until the heating mechanism moves back to the initial position and reaches the target heating power. Among them, when the amplitude is greater than or equal to 5°C, turn to Step 2; if it is less than 5°C, then proceed to the next step.

[0075] Step 9: The heating mechanism moves back to the initial position, the amplitude of all measuring points is less than 5°C, and the target heating power is reached. The heat pipe 100 enters the stable operation stage. Embodiment 2

[0076] Please refer to Figure 4, an embodiment of the present application provides a device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe, which includes: a heating sleeve 300 for heating the heat pipe 100, sleeved on the inclined heat pipe 100 and capable of moving along the axial direction of the heat pipe 100; and a moving mechanism 200 for controlling the movement of the heating sleeve 300, configured to control the heating sleeve 300 to perform corresponding movement along the axial direction of the heat pipe 100 according to a preset control logic. Wherein, the preset control logic includes: when the heat pipe 100 starts to operate under a non-horizontal condition, in response to the occurrence of intermittent boiling inside the heat pipe 100, the moving mechanism 200 is used to move the heating sleeve 300 so that the heating position moves from the liquid pool area of the heat pipe 100 to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, the heating sleeve 300 is gradually moved back to the original position.

[0077] Through dynamically adjusting the position of the heating sleeve 300, the above embodiment effectively reduces the violent vaporization in the liquid pool area, reduces the pressure fluctuation, and can effectively suppress the intermittent boiling that occurs when the heat pipe 100 starts under a non-horizontal condition. The device can suppress the intermittent boiling phenomenon, thereby improving the heat transfer efficiency and operating stability of the heat pipe 100. Moreover, by adopting the method of moving the heating sleeve 300, the heat pipe 100 can operate under multiple conditions to avoid intermittent boiling, avoiding the method of reducing power, so as to greatly expand the operating condition range, which is more in line with the actual engineering application of the heat pipe reactor.

[0078] Based on the foregoing solution, please refer to Figure 4 , in some implementation manners of the present application, the moving mechanism 200 includes a motor 201, a slider 203, and a lead screw 202 arranged parallel to the heat pipe 100. Wherein, the output shaft of the motor 201 is connected to the end of the lead screw 202, the lead screw 202 can rotate along its central axis as the output shaft of the motor 201 rotates, and the rotation control logic of the motor 201 is constructed according to the preset control logic; the slider is connected to the heating sleeve 300, and a threaded through hole adapted to the lead screw 202 is provided on the slider 203. When the lead screw 202 rotates, the slider 203 performs a translational movement along the axial direction of the lead screw 202 to drive the heating sleeve 300 to move along the axial direction of the heat pipe 100.

[0079] In the above implementation manner, the rotation of the lead screw 202 is converted into the translational movement of the slider 203. Since the slider 203 is connected to the heating sleeve 300, the movement of the slider 203 will drive the heating sleeve 300 to move along the axial direction of the heat pipe 100. By precisely controlling the rotation speed and rotation time of the motor 201, the precise control of the moving position and moving speed of the heating sleeve 300 can be achieved.

[0080] Based on the foregoing solution, please refer to Figure 4, in some implementation manners of the present application, the moving mechanism 200 further includes a guide rod 204. A guide through hole adapted to the guide rod 204 is provided on the slider 203, and the guide rod 204 is slidably connected to the slider 203 through the guide through hole.

[0081] In the above implementation manner, the guide rod 204 provides a stable guiding effect for the slider 203, significantly improving the accuracy of the heating sleeve 300 moving along the axial direction of the heat pipe 100. This helps to more precisely control the heating position, thereby more effectively suppressing the intermittent boiling phenomenon. At the same time, through the sliding connection between the guide rod 204 and the slider 203, the moving mechanism 200 can maintain higher stability during the moving process. This helps to reduce errors caused by vibration and deviation, improving the overall performance of the system. And, since the design of the guide rod 204 and the guide through hole is relatively simple and clear, it is more convenient and fast to perform maintenance and troubleshooting. This helps to reduce the downtime and maintenance cost of the system.

[0082] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claimed claim.

Claims

1. A method for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe, characterized in that, It includes the following steps: When the heat pipe starts to operate under non-horizontal conditions, in response to intermittent boiling occurring inside the heat pipe, move the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

2. The method according to claim 1, characterized in that, The liquid pool area and the non-liquid pool area of the heat pipe are determined by obtaining the temperature changes of multiple measuring points axially distributed on the heat pipe in real time, obtaining the temperature-time function expression of each measuring point, and then determining based on the temperature-time function expression of each measuring point.

3. The method according to claim 2, wherein The basis for judging the occurrence of intermittent boiling inside the heat pipe is that the temperatures of each measuring point show regular or irregular oscillations.

4. The method according to claim 2, wherein The steps for determining the liquid pool area and the non-liquid pool area of the heat pipe include: Substitute the temperature-time data of multiple measuring points axially distributed on the heat pipe obtained in real time into a preset sine mathematical expression to obtain the temperature-time function expression of each measuring point; Determine the position where the first measuring point is located as the liquid pool area of the heat pipe, and determine the position where the second measuring point is located as the non-liquid pool area of the heat pipe; wherein, the first measuring point and the second measuring point are adjacent, the first measuring point is located below the second measuring point, and at the same time, the temperature-time function expressions of the first measuring point and the second measuring point show opposite phase characteristics.

5. The method according to claim 4, wherein The step of moving the heating mechanism so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area includes: Move the heating mechanism axially along the heat pipe from the liquid pool area to the non-liquid pool area by a first preset distance; After an interval of the first preset time, control the heating mechanism to continue to move axially along the heat pipe from the liquid pool area to the non-liquid pool area by a second preset distance according to a preset judgment mechanism, or stop moving the heating mechanism; wherein, the preset judgment mechanism is established based on the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point, and is used to judge whether the heat pipe reaches a predetermined working condition.

6. The method according to claim 2, wherein The step of gradually moving the heating mechanism back to the original position when the intermittent boiling phenomenon weakens includes: After the heat pipe reaches the predetermined working condition and after an interval of the second preset time, judge whether the intermittent boiling phenomenon weakens according to the change of the amplitude values corresponding to the temperature-time function expressions of each measuring point, and when it is determined that the intermittent boiling phenomenon weakens, gradually move the heating mechanism back to the original position.

7. A device for suppressing intermittent boiling at an inclined angle of a high-temperature heat pipe, characterized in that, It includes: A heating sleeve for heating the heat pipe, sleeved on the inclined heat pipe and capable of moving axially along the heat pipe; And A moving mechanism for controlling the movement of the heating sleeve, used to control the heating sleeve to move axially along the heat pipe according to a preset control logic; Wherein, the preset control logic includes: when the heat pipe starts to operate under non-horizontal conditions, in response to intermittent boiling occurring inside the heat pipe, use the moving mechanism to move the heating sleeve so that the heating position moves from the liquid pool area of the heat pipe to the non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually move the heating sleeve back to the original position.

8. The device according to claim 7, characterized in that, The moving mechanism includes a motor, a slider and a lead screw arranged parallel to the heat pipe; Wherein, the output shaft of the motor is connected to the end of the lead screw, the lead screw can rotate along its own central axis as the output shaft of the motor rotates, and the rotation control logic of the motor is constructed according to the preset control logic; The slider is connected to the heating sleeve, and a threaded through hole adapted to the lead screw is provided on the slider. When the lead screw rotates, the slider moves translationally along the axial direction of the lead screw to drive the heating sleeve to move along the axial direction of the heat pipe.

9. The device according to claim 8, characterized in that The moving mechanism further includes a guide rod. A guide through hole adapted to the guide rod is provided on the slider, and the guide rod is slidably connected to the slider through the guide through hole.

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