Method and device for inhibiting intermittent boiling under inclination angle of high-temperature heat pipe

Abstract

The invention provides a method and a device for inhibiting intermittent boiling of a high-temperature heat pipe at an inclination angle, and relates to the technical field of high-temperature heat pipes. The method comprises the steps that when the heat pipe is started to operate under the non-horizontal working condition, the heating mechanism is moved in response to intermittent boiling in the heat pipe, so that the heating position is moved from a liquid pool area of the heat pipe to a non-liquid pool area, and when the intermittent boiling phenomenon is weakened, the heating mechanism is gradually moved back to the original position. The device comprises a heating sleeve used for heating a heat pipe, and the heating sleeve is arranged on the obliquely-arranged heat pipe in a sleeving mode and can move in the axial direction of the heat pipe; and the moving mechanism is used for controlling the heating sleeve to move and 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 is constructed based on the method. According to the technical scheme, the intermittent boiling problem of the high-temperature heat pipe under the non-horizontal working condition can be flexibly and efficiently solved.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature heat pipes, and in particular to a method and a device for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe. Background Art

[0002] Common solutions to the intermittent boiling problem that occurs when high-temperature heat pipes operate under non-horizontal conditions include suppressing intermittent boiling by adjusting the input power, inclination angle, cooling capacity of the condensation section, and controlling the liquid filling rate of the heat pipe itself and the type and structure of the liquid 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 the design of the liquid wick are inherent properties of the heat pipe manufacturing process and cannot be easily changed in actual testing. Summary of the invention

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

[0005] This application is implemented as follows: In a first aspect, the present application provides a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe, comprising the following steps: when the heat pipe starts operating under non-horizontal conditions, in response to intermittent boiling occurring inside the heat pipe, moving a heating mechanism so that the heating position moves from a liquid pool area of ​​the heat pipe to a non-liquid pool area, and when the intermittent boiling phenomenon weakens, gradually moving the heating mechanism back to its original position.

[0006] In some implementations, the liquid pool area and non-liquid pool area of ​​the heat pipe are determined by acquiring 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 the temperature-time function expression of each measuring point.

[0007] In some implementations, the presence of intermittent boiling inside the heat pipe is determined based on whether the temperatures at each measuring point oscillate regularly or irregularly.

[0008] In some implementations, the step of determining the liquid pool area and the non-liquid pool area of ​​the heat pipe includes: substituting the temperature-time data of multiple measuring points axially distributed on the heat pipe acquired in real time into a preset sinusoidal mathematical expression to obtain the temperature-time function expression of each measuring point. The location of the first measuring point is determined as the liquid pool area of ​​the heat pipe, and the location of the second measuring point is determined as the non-liquid pool area of ​​the heat pipe; 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 the measuring point temperature-time function expressions of the first measuring point and the second measuring point present opposite phase characteristics.

[0009] In some implementations, the step of moving the heating mechanism so that the heating position moves from the liquid pool area to the non-liquid pool area of ​​the heat pipe includes: moving the heating mechanism along the axial direction of the heat pipe from the liquid pool area to the non-liquid pool area by a first preset distance. After the first preset time interval, the heating mechanism is controlled to continue to move along the axial direction of the heat pipe from the liquid pool area to the non-liquid pool area by a second preset distance, or the heat pipe is determined to have reached a predetermined operating condition, so as to stop moving the heating mechanism; wherein the preset judgment mechanism is established according to the change in the amplitude value corresponding to the temperature-time function expression of each measuring point, so as to judge whether the heat pipe has reached the predetermined operating condition.

[0010] In some implementations, the step of gradually moving the heating mechanism back to its original position when the intermittent boiling phenomenon weakens includes: after the heat pipe reaches a predetermined operating condition and a second preset time interval has elapsed, judging whether the intermittent boiling phenomenon has weakened based on changes in the amplitude values ​​corresponding to the temperature-time function expressions of each measuring point, and gradually moving the heating mechanism back to its original position when it is determined that the intermittent boiling phenomenon has weakened.

[0011] In the second aspect, the present application provides a device for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe, which includes: a heating sleeve for heating the heat pipe, which is sleeved on the inclined heat pipe and can move along the axial direction of the heat pipe; and a moving mechanism for controlling the movement of the heating sleeve, which is used to control the heating sleeve to move accordingly along the axial direction of the heat pipe according to a preset control logic. Wherein, the preset control logic includes: when the heat pipe is started and operated under non-horizontal conditions, in response to intermittent boiling inside the heat pipe, the heating sleeve is moved by the moving 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, the heating sleeve is gradually moved back to the original position.

[0012] In some implementations, the moving mechanism includes a motor, a slider, and a screw rod arranged parallel to the heat pipe. The output shaft of the motor is connected to the end of the screw rod, and the screw rod 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 screw rod is provided on the slider. When the screw rod rotates, the slider moves in translation along the axial direction of the screw rod to drive the heating sleeve to move along the axial direction of the heat pipe.

[0013] In some implementations, the moving mechanism further includes a guide rod, the slider is provided with a guide through hole adapted to the guide rod, and the guide rod is slidably connected to the slider via the guide through hole.

[0014] Compared with the prior art, the present invention has at least the following advantages or beneficial effects: The present application proposes a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe. When the heat pipe is started under non-horizontal conditions, the position of the heating mechanism is dynamically adjusted to effectively reduce the violent vaporization of the liquid pool area and reduce pressure fluctuations, which can effectively suppress the intermittent boiling that occurs when the heat pipe is started under non-horizontal conditions. This method not only overcomes the limitations of the prior art in adjusting input power, inclination, cooling capacity, liquid filling rate, and liquid wick design, 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 widespread application of high-temperature heat pipe technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a flow chart of an embodiment of a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe according to the present application; Figure 2 The temperature distribution curve of the measuring point of the evaporation section of the embodiment of the method for suppressing intermittent boiling under the inclination angle of a high-temperature heat pipe of the present application; Figure 3 A temperature distribution curve of a measuring point in the evaporation section of another embodiment of a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe according to the present application; Figure 4 This is a structural schematic diagram of an embodiment of a device for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe according to the present application.

[0017] Icons: 100, heat pipe; 200, moving mechanism; 201, motor; 202, screw rod; 203, slider; 204, guide rod; 300, heating sleeve. DETAILED DESCRIPTION

[0018] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. The components of the embodiment of the present application described and shown in the accompanying drawings here can be arranged and designed in various configurations. In this article, relational terms such as first and second, etc. are only used to distinguish an entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations.

[0019] In conjunction with the accompanying drawings, some implementation methods of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] In order to facilitate understanding of the technical solution provided by this application, some concepts are introduced below.

[0021] 1. Intermittent boiling The intermittent boiling of the heat pipe 100 is a complex heat transfer phenomenon, which specifically refers to the two-phase flow pattern changes and temperature instability fluctuations caused by certain reasons during the evaporation and condensation of the working liquid inside the heat pipe 100. The specific manifestation of intermittent boiling includes the flow of steam and condensate inside the same pipe. When the heat input is uneven, the liquid in some areas will evaporate quickly to form steam, while other areas will have insufficient liquid, causing flow pattern changes and temperature fluctuations. Such fluctuations will further affect the heat transfer efficiency and working stability of the heat pipe 100.

[0022] The process of intermittent boiling includes the generation, growth, and rupture of bubbles, as well as the reflux and reheating of liquid. The specific process is: 1) Bubble generation: As the heat flux increases, the temperature of the evaporation section tube wall increases, and the working fluid in contact with the inner wall of the evaporation section begins to generate bubbles; 2) Bubble growth: Due to the high temperature of the evaporation section wall, the bubbles grow rapidly to 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 supercooled liquid returns to the evaporation section liquid pool to be heated, preparing for the next bubble generation.

[0023] 2. Liquid pool area The liquid pool area refers to an area 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 the capillary wick heat pipe). When the heat pipe 100 is working, the liquid working fluid in this area will absorb heat from the external heat source, and part of the working fluid will evaporate into steam, which will then rise to the condensation section for condensation and release heat. Since the liquid working fluid is relatively concentrated in the liquid pool area, the heat exchange in this area is mainly based on nucleate boiling (if the heat flux density is high enough) and / or single-phase convection heat transfer. The size and position of the liquid pool area will be affected by many 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).

[0024] 3. Non-liquid pool area The non-liquid pool area refers to the part of the evaporation section of the heat pipe 100 other than the liquid pool area. In this area, the distribution of liquid working fluid is relatively small, 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 exchange in the non-liquid pool area is mainly achieved through liquid film evaporation and / or single-phase convection heat transfer. Since the distribution of the liquid working fluid is not as concentrated as in the liquid pool area, the heat exchange capacity of the non-liquid pool area may be relatively low. However, under certain conditions (such as when the heat flux density is low), nucleate boiling may also occur in the non-liquid pool area, but this is usually not the main heat exchange mode.

[0025] Example 1 In the field of high-temperature heat pipe technology, the problem of intermittent boiling under non-horizontal conditions has always been a difficulty that restricts the performance improvement of the heat pipe 100. Based on an in-depth analysis of the prior art, the inventors have discovered a series of common methods aimed at suppressing intermittent boiling, such as adjusting the input power, changing the inclination angle, improving the cooling capacity of the condensation section, and optimizing the filling rate and liquid wick design 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, although reducing the input power can reduce the boiling intensity, it sacrifices the heat transfer efficiency of the heat pipe 100; the adjustment of the inclination angle is limited by the actual application scenario and is often not feasible; the improvement of the cooling capacity of the condensation section is limited by the equipment design and the working environment; the filling rate and the design of the liquid wick are inherent properties in the manufacturing process of the heat pipe 100, and it is difficult to adjust them later.

[0026] Specifically, in actual projects, heat pipe stacks are often used in special situations due to the particularity of their scenarios, such as being used as land-based mobile nuclear power sources, deep space, deep sea small nuclear power sources, etc., and there are special situations where they operate at different tilt angles. In other specific places, heat pipe stacks are fixed in specific positions due to their advantages such as modularity, small size, and special safety, so their posture remains unchanged. At this time, it is not practical to reduce the tilt angle, thereby reducing the intensity of intermittent boiling and delaying the operating range where intermittent boiling occurs. In addition, the cooling capacity reflects the heat transfer power of the heat pipe 100. In some specific occasions, Heat pipe stackThe cooling capacity is fixed, that is, the heat transfer power is constant, and the intermittent boiling phenomenon of the heat pipe 100 cannot be affected by adjusting the cooling capacity. In other words, 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 a stable operating state faster. At the same time, the filling rate and the type and structure of the liquid wick are inherent properties of the heat pipe 100 design and cannot be changed later.

[0027] To this end, the embodiment of the present application provides a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe. When the heat pipe 100 is started under non-horizontal working 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 is intended 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 gradually moves back to the original position to ensure the normal heat transfer efficiency of the heat pipe 100.

[0028] This implementation idea not only overcomes the limitations of adjusting input power, inclination angle, cooling capacity, liquid filling rate and liquid wick design in the prior art, but also improves the adaptability and stability of the heat pipe 100 under non-horizontal working conditions. That is, 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 100, providing new possibilities for the wide application of high-temperature heat pipe technology.

[0029] See also Figure 1 The method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe comprises the following steps: when the heat pipe 100 starts to operate under a non-horizontal condition, in response to intermittent boiling occurring inside the heat pipe 100, the heating mechanism is moved so that the heating position is moved 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 mechanism is gradually moved back to the original position.

[0030] 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, among which gravity also has a certain influence on the auxiliary working fluid reflux (the influence of gravity is small). When the heat pipe 100 is placed horizontally or tilted, after the working fluid is heated and evaporated in the evaporation section, the steam flows to the condensation section under the action of the pressure difference, but in the reflux process, if there is not enough gravity to help, the reflux speed of the working fluid will slow down, causing the liquid level in the evaporation section to drop and form a gas plug. As the temperature of the evaporation section increases, the volume of the gas plug increases and the pressure increases. When the pressure reaches a certain value, the gas plug will temporarily block the flow of the liquid, forming an intermittent boiling phenomenon. In other words, when the heat pipe 100 is started under non-horizontal working conditions, intermittent boiling will occur. If intermittent boiling occurs, the heat transfer efficiency of the heat pipe 100 will decrease, 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.

[0031] In the above embodiment, when the intermittent boiling phenomenon is detected, the heating mechanism is immediately moved from the liquid pool area to the non-liquid pool area (such as the steam area or the edge of the liquid pool). This operation is intended to reduce the direct centralized heating of a large amount of liquid working fluid and avoid the sudden increase in pressure and boiling instability caused by the violent 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 the heat pipe 100 can maintain a high heat transfer efficiency while reducing the negative impact of intermittent boiling when it is started under non-horizontal conditions.

[0032] In summary, when the heat pipe 100 is started under non-horizontal working conditions, the position of the heating mechanism is dynamically adjusted to effectively reduce the violent vaporization of the liquid pool area, reduce pressure fluctuations, and effectively suppress the intermittent boiling that occurs when the heat pipe 100 is started under non-horizontal working conditions. This reduces the thermal stress and mechanical vibration caused by intermittent boiling, helps reduce the wear of the heat pipe 100 and its connecting parts, and thus extends the overall service life of the equipment.

[0033] Based on the aforementioned scheme, in some implementations of the present application, the liquid pool area and the non-liquid pool area of ​​the heat pipe 100 are determined according to the temperature-time function expression of each measuring point after obtaining the temperature changes of multiple measuring points axially distributed on the heat pipe 100 in real time and obtaining the temperature-time function expression of each measuring point.

[0034] It should be noted that in the above implementation, by acquiring the temperature changes of multiple measuring 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 accurately control the position movement of the heating mechanism, thereby more effectively suppressing the intermittent boiling phenomenon. Among them, on the basis of accurately determining the liquid pool area and the non-liquid pool area, the heating strategy can be further optimized. For example, a lower heating intensity is used 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.

[0035] Based on the above scheme, in some implementations of the present application, the basis for judging whether intermittent boiling occurs inside the heat pipe 100 is that the temperatures at various measuring points oscillate regularly or irregularly.

[0036] It should be noted that the inventors have found that when a large amount of working fluid is filled into the heat pipe 100, due to the gradual increase in heating power, the sodium working fluid is periodically pushed from the evaporation section to the condensation section at a higher speed, and periodic heat transfer oscillations will occur in the evaporation section and the condensation section, which is manifested as periodic changes in the temperature of the evaporation section and the condensation section, often accompanied by metal impact sounds in the heat pipe 100. In extreme cases, the large-scale mechanical vibration of the heat pipe 100 caused by intermittent boiling may damage the pipe wall, causing the heat pipe 100 to leak or rupture. For this reason, in the above implementation, by clarifying the judgment basis for the occurrence of intermittent boiling inside the heat pipe 100 as the regular or irregular oscillation of the temperature at each measuring point, not only the accuracy of monitoring is improved, but also the control measures are optimized and the reliability of the system is enhanced.

[0037] Among them, since temperature oscillation is a direct reflection of the change in the state of the working medium during intermittent boiling. By monitoring the temperature oscillation, the vaporization and condensation process of the working medium inside the heat pipe 100 can be indirectly monitored, so as to accurately judge the occurrence of intermittent boiling. In addition, temperature is a physical quantity that is easy to monitor in the heat pipe 100 system, and temperature oscillation has obvious characteristics, which is easy to identify and judge through data processing and analysis. Furthermore, since temperature oscillation is an immediate manifestation of intermittent boiling, intermittent boiling phenomenon can be quickly discovered by monitoring temperature oscillation, which provides the possibility of taking control measures in time.

[0038] Based on the above scheme, in some implementations of the present application, the step of determining the liquid pool area and the non-liquid pool area of ​​the heat pipe 100 includes: bringing the temperature-time data of multiple measuring points axially distributed on the heat pipe 100 acquired in real time into a preset sinusoidal mathematical expression to obtain the temperature-time function expression of each measuring point. The location of the first measuring point is determined as the liquid pool area of ​​the heat pipe 100, and the location of the second measuring point is determined 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 the measuring point temperature-time function expressions of the first measuring point and the second measuring point present opposite phase characteristics.

[0039] In the above implementation, by introducing sinusoidal mathematical expressions and phase characteristic analysis, the temperature oscillation characteristics of different areas inside the heat pipe 100 can be more accurately described and distinguished, thereby accurately determining the positions of the liquid pool area and the non-liquid pool area. And its implementation does not rely on complex physical models or expensive experimental equipment, but is based on real-time temperature data and simple mathematical processing, so it has strong practicality 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 more accurately adjusted to more effectively suppress the intermittent boiling phenomenon and improve the stability and heat transfer efficiency of the heat pipe 100.

[0040] For example, if the temperature-time data of multiple measuring points axially distributed on the heat pipe 100 acquired in real time are brought into the preset sinusoidal mathematical expression, the obtained temperature-time function expression of each measuring point is as follows: T 1 =A 1 sin ( 2πft+φ 1 ) (Expression 1) T 2 =A 2 sin ( 2πft+φ 2 ) (Expression 2) … in, T 1 and T 2 Indicates the temperature of the measuring point. A 1 and A 2 represents the amplitude, f Indicates frequency, t Indicates time, φ 1 and φ2 Indicates the respective phases. The temperature-time function expressions of all measuring points have the same frequency, different amplitudes, and different phases. If △= φ 1 - φ 2 =π / 2, then the measuring point corresponding to expression 1 is in the liquid pool area, and the measuring point corresponding to expression 2 is in the non-liquid pool area.

[0041] For example, Figure 2 As shown, Figure 2 This is a temperature distribution curve of the measuring points in the evaporation section of an embodiment of a method for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe according to the present application. In this example, the temperature of each measuring point oscillates regularly.

[0042] in, Figure 2 The vertical axis is the temperature value of the measuring point (in °C). Figure 2 The horizontal line 3 in the figure represents the temperature of the liquid pool area at the measuring point temperature, that is, the measuring point temperature at the 40 cm position of the heat pipe 100 (multiple measuring points are distinguished by the length interval of the heat pipe 100 in the figure). Figure 2 It can be seen that the position of the liquid pool area (working fluid convergence area) is 0-40cm, 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 in the liquid pool area is opposite to that of the non-liquid pool area. When the temperature of the liquid pool area is the highest, the temperature of the non-liquid pool area is the lowest (according to Figure 2 As can be seen from the vertical line 2 in the figure), when the temperature of the liquid pool area is the lowest, the temperature of the non-liquid pool area is the highest (according to Figure 2 It can be seen from the vertical line 1 in the figure), that is, the oscillation phases are opposite.

[0043] like Figure 3 As shown, Figure 3 This is a temperature distribution curve of the evaporation section measuring point of another embodiment of the method for suppressing intermittent boiling at a high-temperature heat pipe inclination of the present application. In this example, the temperature of each measuring point oscillates irregularly. Figure 3 The vertical axis is the temperature value of the measuring point (in °C). Figure 3 The horizontal lines 3 and 4 in the figure represent the temperature of the liquid pool area at the measuring point temperature, that is, the temperature of the measuring point at the 70cm and 80cm position of the heat pipe 100 (multiple measuring points are distinguished by the length interval of the heat pipe 100 in the figure). Figure 3 It can be seen that the position of the liquid pool area (working fluid convergence area) is 0-80cm, and the heat flux density at these two points is the largest (the temperature at these two points is the highest). The temperature of the measuring point in the liquid pool area is opposite to that of the non-liquid pool area. When the temperature of the liquid pool area is the highest, the temperature of the non-liquid pool area is the lowest (as can be seen from vertical line 1), and when the temperature of the liquid pool area is the lowest, the temperature of the non-liquid pool area is the highest (as can be seen from vertical line 2), that is, the oscillation phase is opposite.

[0044] Based on the above scheme, in some implementations of the present application, the step of moving the heating mechanism so that the heating position is moved from the liquid pool area to the non-liquid pool area of ​​the heat pipe 100 includes: moving the heating mechanism from the liquid pool area to the non-liquid pool area along the axial direction of the heat pipe 100 by a first preset distance. After the first preset time interval, the heating mechanism is controlled to continue to move from the liquid pool area to the non-liquid pool area along the axial direction of the heat pipe 100 by a second preset distance according to a preset judgment mechanism, or the heat pipe 100 is judged to have reached a predetermined working condition, so as to stop moving the heating mechanism; wherein the preset judgment mechanism is established according to the change of the amplitude value corresponding to the temperature-time function expression of each measuring point, so as to judge whether the heat pipe 100 has reached the predetermined working condition.

[0045] In the above implementation, the heating mechanism is first moved a first preset distance along the axial direction of the heat pipe 100 from the liquid pool area to the non-liquid pool area. This operation is intended to preliminarily change the heating position to reduce direct heating of the working medium in the liquid pool area, thereby suppressing intermittent boiling. Then, after an interval of a first preset time, the further movement of the heating mechanism is controlled according to a preset judgment mechanism. The core of the preset judgment mechanism is to judge whether the working condition of the heat pipe 100 is stable based on the change in the amplitude value, thereby helping to quickly suppress the intermittent boiling phenomenon and enable the heat pipe 100 to reach the predetermined working condition faster, thereby improving 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.

[0046] Among them, the preset judgment mechanism is established based on the change of the amplitude value corresponding to the temperature-time function expression 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 indicator for judging whether the working condition of the heat pipe 100 is stable. If the amplitude value continues to decrease, it means 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 continue to be moved along the axis of the heat pipe 100 from the liquid pool area to the non-liquid pool area for a second preset distance as needed to further optimize the heat transfer efficiency. If the amplitude value no longer changes significantly or reaches below the preset threshold, it means 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 adjustments.

[0047] Based on the aforementioned scheme, in some implementations 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 a predetermined operating condition and a second preset time interval has elapsed, judging whether the intermittent boiling phenomenon has weakened according to the change in the amplitude value corresponding to the temperature-time function expression of each measuring point, and when it is determined that the intermittent boiling phenomenon has weakened, gradually moving the heating mechanism back to the original position.

[0048] It should be noted that, in order to ensure that the working condition of the heat pipe 100 is stable and the intermittent boiling phenomenon is effectively controlled, the heating mechanism can be moved back to its original position in a timely and gradual manner to maintain the long-term efficient operation of the heat pipe 100. The steps of controlling the return of the heating mechanism in the above implementation can be refined as follows: 1) Confirmation of stable state: First, it is necessary to confirm that the heat pipe 100 has reached the predetermined working condition. This can be achieved by monitoring the amplitude value corresponding to the temperature-time function expression of each measuring point. When the amplitude value is stable within a certain range or reaches below a preset threshold, it can be considered that the heat pipe 100 is in a stable state.

[0049] 2) Waiting at a time interval: After confirming that the heat pipe 100 has reached the predetermined working condition, a second preset time interval is required. This time interval is to ensure that the working medium state inside the heat pipe 100 is sufficiently stable to avoid misjudgment due to short-term fluctuations.

[0050] 3) Judgment of intermittent boiling phenomenon: After the second preset time interval, the intermittent boiling phenomenon is judged again based on the change of the amplitude value corresponding to the temperature-time function expression of each measuring point to determine whether the intermittent boiling phenomenon has weakened. 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.

[0051] 4) Relocation of the heating mechanism: After determining that the intermittent boiling phenomenon has weakened, the heating mechanism can be gradually relocated to its original position. The relocation process should be gradual to avoid drastic changes in the state of the working medium inside the heat pipe 100 due to a sudden change in the heating position.

[0052] In summary, the above implementation method not only improves the operating efficiency and system stability of the heat pipe 100, but also optimizes energy consumption by timely and gradually moving the heating mechanism back to the original position when the intermittent boiling phenomenon weakens.

[0053] In order to make the technical personnel in this field understand the present application more intuitively, a specific example will be used here to illustrate. In this example, the method of suppressing intermittent boiling at the inclination angle of the high-temperature heat pipe includes the following steps: Step 1: During the start-up of the heat pipe 100, the power is increased at 15 W / min until intermittent boiling occurs.

[0054] Step 2: Collect the transient temperature changes of all measuring points within 2 minutes, perform data fitting, and obtain the temperature-time function expression of each measuring point.

[0055] Step 3: Determine the liquid pool area and the non-liquid pool area. The temperature-time function expressions of all measurement points have the same frequency and 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.

[0056] Step 4: Based on the judgment results regarding the liquid pool area and the non-liquid pool area, control the heating mechanism to move toward the non-liquid pool area.

[0057] Step 5: Determine whether the amplitude of the temperature-time function expression of the measuring point corresponding to the liquid pool area 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, proceed to the next step.

[0058] Step 6: Then increase the power by 15W / min. Each time the power is increased, determine whether the temperature change rate of all measuring points is less than 1℃ / min. If it is less than 1℃ / min, proceed to the next step; otherwise, do not increase the power by 15W / min, keep the current power unchanged, and wait until the temperature change rate of all measuring points is less than 1℃ / min before proceeding to the next step.

[0059] Step 7: Control the heating mechanism to move back to the original position, 1 cm each time, and judge the amplitude of the temperature-time function expression of the measuring point corresponding to the liquid pool area until the amplitude is less than 5°C. When the amplitude is greater than or equal to 5°C, go to step 2. If the amplitude is less than 5°C when moving back to the initial position, the amplitude is no longer judged, and jump directly to step 9.

[0060] Step 8: Then increase the power by 15W / min. Each time the power is increased, the amplitude of all measuring points is judged, and the power is increased until the heating mechanism moves back to the initial position and the target heating power is reached. If the amplitude is greater than or equal to 5°C, go to step 2; if it is less than 5°C, go to the next step.

[0061] Step 9: The heating mechanism moves back to the initial position and reaches the target heating power, and the heat pipe 100 enters a stable operation stage.

[0062] Example 2 See also Figure 4, the embodiment of the present application provides a device for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe, which includes: a heating sleeve 300 for heating a heat pipe 100, which is sleeved on the inclined heat pipe 100 and can move along the axial direction of the heat pipe 100; and a moving mechanism 200 for controlling the movement of the heating sleeve 300, which is used to control the heating sleeve 300 to move accordingly along the axial direction of the heat pipe 100 according to a preset control logic. The preset control logic includes: when the heat pipe 100 starts to operate under a non-horizontal working 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.

[0063] The above embodiment effectively reduces the violent vaporization of the liquid pool area and reduces the pressure fluctuation by dynamically adjusting the position of the heating sleeve 300, which can effectively suppress the intermittent boiling that occurs when the heat pipe 100 is started under non-horizontal conditions. The device can suppress the intermittent boiling phenomenon, thereby improving the heat transfer efficiency and operating stability of the heat pipe 100. In addition, by adopting a mobile heating sleeve 300, the heat pipe 100 can be operated under multiple operating conditions to avoid intermittent boiling, avoiding the use of a power reduction method, thereby greatly expanding the operating range, which is more in line with the actual engineering application of the heat pipe stack.

[0064] Based on the above scheme, please refer to Figure 4 In some implementations of the present application, the moving mechanism 200 includes a motor 201, a slider 203, and a screw 202 arranged parallel to the heat pipe 100. The output shaft of the motor 201 is connected to the end of the screw 202, and the screw 202 can rotate along its own central axis as the output shaft of the motor 201 rotates. The rotation control logic of the motor 201 is constructed according to the preset control logic; the sliding mechanism 200 is connected to the heating sleeve 300, and the slider 203 is provided with a threaded through hole adapted to the screw 202. When the screw 202 rotates, the slider 203 moves in translation along the axial direction of the screw 202 to drive the heating sleeve 300 to move axially along the heat pipe 100.

[0065] In the above implementation, the rotation of the screw rod 202 is converted into the translational motion of the slider 203. Since the slider 203 is connected to the heating sleeve 300, the movement of the slider 203 drives the heating sleeve 300 to move along the axial direction of the heat pipe 100. By accurately controlling the rotation speed and rotation time of the motor 201, the moving position and moving speed of the heating sleeve 300 can be accurately controlled.

[0066] Based on the above scheme, please refer to Figure 4In some implementations of the present application, the moving mechanism 200 further includes a guide rod 204, the slider 203 is provided with a guide through hole adapted to the guide rod 204, and the guide rod 204 is slidably connected to the slider 203 through the guide through hole.

[0067] In the above implementation, the guide rod 204 provides a stable guiding effect for the slider 203, significantly improving the accuracy of the axial movement of the heating sleeve 300 along the heat pipe 100. This helps to control the heating position more accurately, 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 movement. This helps to reduce errors caused by vibration and offset, and improve the overall performance of the system. In addition, since the design of the guide rod 204 and the guide through hole is relatively simple and clear, it is more convenient and quick when performing maintenance and troubleshooting. This helps to reduce the downtime and maintenance costs of the system.

[0068] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for inhibiting intermittent boiling at an inclination angle of a high-temperature heat pipe, characterized in that: The following steps are involved: When the heat pipe starts operating under non-horizontal conditions, in response to intermittent boiling inside the heat pipe, the heating mechanism is moved 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, the heating mechanism is gradually moved back to the original position.

2. The method according to claim 1, characterized in that: The liquid pool area and 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, and obtaining the temperature-time function expression of each measuring point, and then determining it according to the temperature-time function expression of each measuring point.

3. The method according to claim 2, characterized in that The basis for judging whether intermittent boiling occurs inside the heat pipe is that the temperature at each measuring point oscillates regularly or irregularly.

4. The method according to claim 2, characterized in that: The steps for determining the liquid pool area and non-liquid pool area of ​​the heat pipe include: The temperature-time data of multiple measuring points axially distributed on the heat pipe acquired in real time are brought into a preset sinusoidal mathematical expression to obtain a temperature-time function expression of each measuring point; The location of the first measuring point is determined as the liquid pool area of ​​the heat pipe, and the location of the second measuring point is determined as the non-liquid pool area of ​​the heat pipe; 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 the measuring point 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, characterized in that 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 along the axial direction of the heat pipe from the liquid pool area to the non-liquid pool area by a first preset distance; After an interval of a first preset time, the heating mechanism is controlled to continue to move a second preset distance from the liquid pool area to the non-liquid pool area along the axis of the heat pipe according to a preset judgment mechanism, or it is determined that the heat pipe has reached a predetermined operating condition to stop moving the heating mechanism; wherein the preset judgment mechanism is established based on the change in the amplitude value corresponding to the temperature-time function expression of each measuring point, and is used to determine whether the heat pipe has reached the predetermined operating condition.

6. The method according to claim 2, characterized in that The step of gradually moving the heating mechanism back to the original position when the intermittent boiling phenomenon weakens comprises: After the heat pipe reaches the predetermined working condition and a second preset time has elapsed, it is determined whether the intermittent boiling phenomenon has weakened according to the change in the amplitude value corresponding to the temperature-time function expression of each measuring point, and when it is determined that the intermittent boiling phenomenon has weakened, the heating mechanism is gradually moved back to the original position.

7. A device for suppressing intermittent boiling at an inclination angle of a high-temperature heat pipe, characterized in that: include: A heating sleeve for heating the heat pipe, which is sleeved on the inclined heat pipe and can move along the axial direction of the heat pipe; as well as A moving mechanism for controlling the movement of the heating sleeve, which is used to control the heating sleeve to move accordingly along the axial direction of the heat pipe according to a preset control logic; Among them, the preset control logic includes: when the heat pipe starts to operate under non-horizontal conditions, in response to intermittent boiling inside the heat pipe, the heating sleeve is moved by a moving 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, the heating sleeve is gradually moved 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 screw rod arranged parallel to the heat pipe; The output shaft of the motor is connected to the end of the screw rod, and the screw rod 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 screw rod is provided on the slider. When the screw rod rotates, the slider moves in a translational direction along the axial direction of the screw rod 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 comprises a guide rod, the slider is provided with a guide through hole adapted to the guide rod, and the guide rod is slidably connected to the slider via the guide through hole.

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