A novel high-temperature pulsating heat pipe working fluid filling device and method

Abstract

This invention provides a novel high-temperature pulsating heat pipe working fluid filling device and method. The filling device includes a working fluid storage unit and a vacuum unit. The working fluid storage unit includes a main cavity and a detachable piston, piston rod, flange, and packing nut. The flange is sealed and installed at the working fluid inlet I, and the flange is provided with a connecting neck. The packing nut is installed on the connecting neck. A sealing assembly is provided inside the connecting neck, which is in close contact with the piston rod. The pre-tightening of the packing nut forms a dynamic seal between the piston rod and the flange. The working fluid outlet is detachably connected to the working fluid inlet II of the high-temperature pulsating heat pipe. The vacuum unit includes a molecular pump unit, which is connected to the vacuum port of the main cavity. The technical solution of this invention is convenient, safe, and leaves minimal residue in the filling pipeline for high-temperature pulsating heat pipe working fluids with high melting points such as sodium and potassium.

Description

Technical Field

[0001] This invention relates to the field of pulsating heat pipe technology, and more particularly to a novel high-temperature pulsating heat pipe working fluid filling device and method. Background Technology

[0002] Pulsating heat pipes utilize the pressure difference generated by the temperature difference between the hot and cold ends of the pipe as the driving force for the flow of the working fluid, achieving oscillating flow of the working fluid within the pipe, thereby enabling efficient heat transfer. Based on the operating temperature range, pulsating heat pipes with operating temperatures exceeding 500℃ are typically referred to as high-temperature pulsating heat pipes.

[0003] Alkali metals and their alloys are commonly used as working fluids in high-temperature pulsating heat pipes due to their excellent thermal stability, high latent heat of vaporization, and good thermal conductivity at high temperatures. However, elemental alkali metals such as sodium, potassium, rubidium, and cesium are all solid at room temperature, which is unfavorable for the liquid filling and start-up of high-temperature pulsating heat pipes. Furthermore, alkali metals and their alloys are highly chemically reactive and easily oxidized and deteriorated, making it difficult to manufacture and apply high-temperature pulsating heat pipes using these elemental alkali metals as working fluids.

[0004] Patent CN107436106A discloses a liquid filling device and method for a liquid metal high-temperature pulsating heat pipe. This method involves preparing and filling the working fluid within a glove box. The main working fluid is a sodium-potassium alloy, which is liquid at room temperature. Because alkali metals such as sodium and potassium have high melting points, continuous high-temperature heating within the glove box is required to ensure the working fluid remains liquid, potentially leading to glove box damage. Furthermore, during the filling process, the glove box body connected to the filling pipeline cannot be heated, causing a large amount of the high-temperature pulsating heat pipe working fluid (such as sodium and potassium) with high melting points to condense within the filling pipeline. Summary of the Invention

[0005] To address the aforementioned issues with existing high-temperature pulsating heat pipes, which require continuous high-temperature heating in a glove box to ensure the working fluid remains liquid during the filling process with high-melting-point metals such as sodium and potassium, there are technical problems such as glove box damage. Furthermore, the inability to heat the glove box portion connected to the filling pipeline during the filling process leads to the condensation of high-temperature pulsating heat pipe working fluids with high melting points like sodium and potassium in the filling pipeline. Therefore, a novel high-temperature pulsating heat pipe working fluid filling device and method is provided, which is particularly advantageous for filling high-temperature pulsating heat pipe working fluids with high melting points like sodium and potassium, offering advantages such as convenient filling, safety, and minimal residue in the filling pipeline.

[0006] The technical means employed in this invention are as follows:

[0007] A novel high-temperature pulsating heat pipe working fluid filling device includes a working fluid storage unit and a vacuum unit;

[0008] The working fluid storage unit includes a main cavity and a detachable piston, piston rod, flange, and packing nut. The main cavity has a working fluid inlet I at the top and a working fluid outlet at the bottom. The flange is sealed to the working fluid inlet I and has a connecting neck. The packing nut is installed on the upper outer side of the connecting neck. The piston is located inside the main cavity. One end of the piston rod passes sequentially through the packing nut and the flange into the main cavity and is detachably connected to the piston.

[0009] The connecting neck is provided with a sealing assembly that is in close contact with the piston rod. The sealing assembly is compressed by the pre-tightening of the packing nut, so that the sealing assembly forms a dynamic seal between the piston rod and the flange.

[0010] The working fluid outlet is equipped with a vacuum valve III and is detachably connected to the working fluid inlet II of the high-temperature pulsating heat pipe via a filling pipeline; a vacuum valve I is installed on the filling pipeline, and the vacuum valve I and the vacuum valve III are connected by a three-way interface. The side opening of the three-way interface is connected to the molecular pump unit via a vacuum pumping pipeline II, and a vacuum valve II is installed on the vacuum pumping pipeline II.

[0011] The vacuum unit includes the molecular pump unit; the molecular pump unit is detachably connected to the vacuum port at the top of the main cavity via a vacuum line I; a vacuum valve IV is installed on the vacuum line I.

[0012] Furthermore, the piston includes a piston base plate, a piston sealing ring I, a sealing ring partition, a piston sealing ring II, and a piston cover plate arranged sequentially from bottom to top; the piston base plate is provided with a mounting post, and the piston sealing ring I, the sealing ring partition, the piston sealing ring II, and the piston cover plate are sequentially sleeved on the mounting post, and the piston rod is threadedly connected to the mounting post.

[0013] Furthermore, the sealing assembly includes a pressure ring, a double-layer butterfly gasket, a support ring I, and a V-shaped sealing ring arranged sequentially from top to bottom; a heat insulation ring is also provided inside the connecting neck, and the piston rod passes through the heat insulation ring; the heat insulation ring is located below the V-shaped sealing ring, and a support ring II is also provided between the V-shaped sealing ring and the heat insulation ring.

[0014] Furthermore, the V-shaped sealing ring includes an upper gasket and a lower gasket, which can be fitted together; at least one middle gasket is also provided between the upper gasket and the lower gasket, and the two middle gaskets can be fitted together on both sides; the flange and the working medium inlet I are sealed by installing a flange flat gasket; the piston rod is provided with a scale for measuring the volume of the filling working medium.

[0015] Furthermore, it also includes a heating unit, including a heating plate, a cover plate, a liquid filling pipeline heating sleeve, and a working fluid storage unit heating sleeve;

[0016] The high-temperature pulsating heat pipe is placed inside the cover plate, and the heating plate is used to cover the cover plate;

[0017] The heating sleeve for the filling pipeline is installed outside the filling pipeline and is used to heat the filling pipeline.

[0018] The heating sleeve of the working fluid storage unit is installed on the lower outer side of the main cavity and is used to heat the heating sleeve of the working fluid storage unit.

[0019] Furthermore, the heating unit also includes a temperature controller; the heating plate includes a terminal block III and a thermocouple III; the liquid filling pipeline heating sleeve includes a terminal block II and a thermocouple II; the working fluid storage unit heating sleeve includes a terminal block I and a thermocouple I.

[0020] Thermocouple I, thermocouple II, and thermocouple III are used to monitor the surface temperatures of the main cavity, the liquid filling pipeline, and the heating plate, respectively.

[0021] Terminal I, terminal II, terminal III, thermocouple I, thermocouple II, and thermocouple III are electrically connected to the temperature controller. The temperature controller is used to control terminal I, terminal II, and terminal III to adjust the heating temperature of the working fluid storage unit heating sleeve, the filling pipeline heating sleeve, and the heating plate based on the monitored surface temperatures of the main cavity, the filling pipeline, and the heating plate.

[0022] The present invention also provides a working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device, for filling liquid working fluid, specifically including the following steps:

[0023] S1: Place the raw materials of the liquid working fluid in a glove box, prepare the high-temperature pulsating heat pipe working fluid in the glove box, and place it in a beaker for later use;

[0024] S2: Place the main chamber, piston, piston rod, flange, sealing assembly, packing nut, and vacuum valve III inside the glove box;

[0025] S3: Install vacuum valve III at the working fluid outlet of the main chamber and close vacuum valve III. Pour the prepared high-temperature pulsating heat pipe working fluid into the vertically placed main chamber as needed. Then install the piston, piston rod, flange, sealing assembly and packing nut on the main chamber.

[0026] S4: Tighten the packing nut to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity from the external environment;

[0027] S5: Transfer the installed working fluid storage unit outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device.

[0028] S6: Turn on the molecular pump unit, open vacuum valves I, II, and IV to evacuate the main chamber until the vacuum level is less than 10. -3 After Pa, shut down the molecular pump unit and close vacuum valves II and IV.

[0029] S7: Open vacuum valve III. Under atmospheric pressure, the liquid working fluid is filled into the high-temperature pulsating heat pipe from the main cavity. After the working fluid is filled, close vacuum valve I.

[0030] Furthermore, the liquid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point below room temperature.

[0031] The present invention also provides a working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device, for filling solid working fluid, specifically including the following steps:

[0032] S1: Place the raw materials of the solid working fluid in a glove box, prepare the high-temperature pulsating heat pipe solid working fluid in the glove box and heat it to melt it into a liquid state, then place it in a beaker for later use;

[0033] S2: Place the main chamber, piston, piston rod, flange, sealing assembly, packing nut, and vacuum valve III inside the glove box;

[0034] S3: Install vacuum valve III at the working fluid outlet of the main chamber and close vacuum valve III. Pour the prepared high-temperature pulsating heat pipe working fluid into the vertically placed main chamber as needed. Then install the piston, piston rod, flange, sealing assembly and packing nut on the main chamber.

[0035] S4: Tighten the packing nut to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity from the external environment;

[0036] S5: Transfer the installed working fluid storage unit outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device, including the heating unit.

[0037] S6: Turn on the molecular pump unit, open vacuum valves I, II, and IV to evacuate the main chamber until the vacuum level is less than 10. -3 After Pa, shut down the molecular pump unit and close vacuum valves II and IV.

[0038] S7: Set the heating temperature according to the melting point of the working fluid, turn on the power supply of the heating plate, the heating jacket of the liquid filling pipeline and the heating jacket of the working fluid storage unit, and heat the high-temperature pulsating heat pipe, the liquid filling pipeline and the lower part of the main cavity so that the working fluid can be completely melted into a liquid state.

[0039] S8: Open vacuum valve III. The molten working fluid is filled into the high-temperature pulsating heat pipe from the main cavity under atmospheric pressure. After the working fluid is filled, close vacuum valve I. Turn off the power to the heating plate, the heating jacket of the liquid filling pipeline and the heating jacket of the working fluid storage unit to stop heating.

[0040] Furthermore, the solid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point higher than room temperature.

[0041] Compared with the prior art, the present invention has the following advantages:

[0042] 1. The novel high-temperature pulsating heat pipe working fluid filling device and method provided by the present invention can fill high-temperature pulsating heat pipes with liquid and solid working fluids.

[0043] 2. The novel high-temperature pulsating heat pipe working fluid filling device and method provided by the present invention avoids prolonged heating in the glove box by filling the working fluid outside the glove box, thereby preventing damage to the glove box.

[0044] 3. The novel high-temperature pulsating heat pipe working fluid filling device and method provided by the present invention can heat the filling device as a whole by filling the working fluid outside the glove box, thus avoiding the problem of working fluid condensation in the filling pipeline caused by uneven heating.

[0045] In summary, the technical solution of this invention can realize the oxidation-free filling of liquid and solid working fluids in a glove box using a high-temperature pulsating heat pipe.

[0046] Based on the above reasons, this invention can be widely applied in the field of high-temperature pulsating heat pipes. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the novel high-temperature pulsating heat pipe working fluid filling device described in Embodiment 1 of the present invention.

[0049] Figure 2This is a schematic diagram of the novel high-temperature pulsating heat pipe working fluid filling device described in Embodiment 3 of the present invention.

[0050] Figure 3 This is a schematic diagram of the working fluid storage unit structure described in this invention.

[0051] Figure 4 This is a schematic diagram of the internal structure of the working fluid storage unit described in this invention.

[0052] In the diagram: 1. Vacuum pump unit; 2. High-temperature pulsating heat pipe; 3. Vacuum valve I; 4. Vacuum valve II; 5. Vacuum valve III; 6. Working fluid storage unit; 7. Vacuum valve IV; 8. Heating jacket for working fluid storage unit; 9. Terminal block I; 10. Thermocouple I; 11. Terminal block II; 12. Thermocouple II; 13. Heating jacket; 14. Temperature controller; 15. Terminal block III; 16. Thermocouple III; 17. 61. Heating plate and cover plate; 62. Piston base plate; 63. Piston seal ring I; 64. Seal ring partition; 65. Piston seal ring II; 66. Piston cover plate; 67. Main cavity; 68. Bolt assembly; 69. Flange; 60. V-ring seal; 611. Butterfly gasket; 612. Pressure ring; 613. Piston rod; 614. Packing nut; 615. Support ring I; 616. Support ring II; 617. Heat insulation ring; 618. Flange flat gasket. Detailed Implementation

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0060] Example 1

[0061] like Figure 1-4 As shown, the present invention provides a novel high-temperature pulsating heat pipe working fluid filling device, including a working fluid storage unit 6 and a vacuum unit;

[0062] The working fluid storage unit 6 includes a main cavity 66 and a detachable piston, piston rod 612, flange 68, and packing nut 613. The main cavity 66 has a working fluid inlet I at the top and a working fluid outlet at the bottom. The flange 68 is sealed to the working fluid inlet I by a bolt assembly 67. The flange 68 has a connecting neck, and the packing nut 613 is installed on the upper outer side of the connecting neck. The piston is located inside the main cavity 66. One end of the piston rod 612 passes through the packing nut 613 and the flange 68 in sequence and extends into the main cavity 66, and is detachably connected to the piston.

[0063] The connecting neck is provided with a sealing assembly that is in close contact with the piston rod 612. The sealing assembly is formed by the pre-tightening of the packing nut 613, which compresses the sealing assembly to form a dynamic seal between the piston rod and the flange.

[0064] The working fluid outlet is equipped with a vacuum valve III5 and is detachably connected to the working fluid inlet II of the high-temperature pulsating heat pipe 2 via a filling pipeline; a vacuum valve I3 is installed on the filling pipeline, and the vacuum valve I3 and the vacuum valve III5 are connected by a three-way interface. The side opening of the three-way interface is connected to the molecular pump unit 1 via a vacuum pumping pipeline II, and a vacuum valve II4 is installed on the vacuum pumping pipeline II.

[0065] The vacuum unit includes the molecular pump unit 1; the molecular pump unit 1 is detachably connected to the vacuum port at the top of the main cavity 66 via a vacuum pumping pipeline I, and is used to evacuate the main cavity 66 and the high-temperature pulsating heat pipe 2 to ensure that the pulsating heat pipe can reach a sufficiently high vacuum level so that the working fluid can be filled smoothly; a vacuum valve IV7 is installed on the vacuum pumping pipeline I.

[0066] Furthermore, the vacuum pumping line I, the vacuum pumping line II, and the liquid filling line are all stainless steel pipes.

[0067] Furthermore, the piston is provided with a double-layer sealing ring that can form a seal with the inner wall of the main cavity 66, which is used to separate the space between the side of the piston and the inner wall of the main cavity 66.

[0068] Furthermore, the piston includes a piston base plate 61, a piston sealing ring I 62, a sealing ring partition 63, a piston sealing ring II 64, and a piston cover plate 65 arranged sequentially from bottom to top. The piston base plate 61 is provided with a mounting post. The piston sealing ring I 62, the sealing ring partition 63, the piston sealing ring II 64, and the piston cover plate 65 are sequentially sleeved on the mounting post. The top of the mounting post is provided with an external thread, and the bottom of the piston rod is provided with an internal thread. The piston rod 612 is threadedly connected to the mounting post. The depth of the piston rod 612's compression on the piston cover plate 65 is controlled by the depth of the mounting post screwing into or out of the piston rod 612. This controls the degree of compression of the piston sealing ring I 62 and the piston sealing ring II 64 by the piston cover plate 65 and the piston base plate 61, so that the piston sealing ring I 62 and the piston sealing ring II 64 can fit tightly against the inner wall of the main cavity 66, achieving effective sealing of the working fluid.

[0069] Furthermore, the packing nut 613 is connected to the connecting neck by a thread.

[0070] Furthermore, the sealing assembly includes a pressure ring 611, a double-layer butterfly washer 610, a support ring I 614, and a V-shaped sealing ring 69 arranged sequentially from top to bottom; by pre-tightening the packing nut 613, the pressure ring 611, the butterfly washer 610, the support ring I 614, and the V-shaped sealing ring 69 can be pressed in sequence, and the V-shaped sealing ring 69 is squeezed and deformed to form an effective dynamic seal, thereby achieving the isolation of the main cavity 66 from the external environment.

[0071] Furthermore, a heat insulation ring 616 is provided inside the connecting neck. The heat insulation ring 616 is located below the sealing assembly, and the piston rod 612 passes through the heat insulation ring 616. The heat insulation ring 616 is used to prevent the upper part of the flange 68 from overheating and affecting the sealing of the V-shaped sealing ring 69 in the sealing assembly.

[0072] Furthermore, the heat insulation ring 616 is located below the V-shaped sealing ring 69, and a support ring II 615 is also provided between the V-shaped sealing ring 69 and the heat insulation ring 616. The support ring II 615 provides the pressure-bearing surface for the heat insulation ring 616 and the V-shaped sealing ring 69.

[0073] Furthermore, the heat insulation ring 616 is made of heat insulation materials such as mica or aluminum silicate insulation cotton.

[0074] Furthermore, the V-shaped sealing ring 69 includes an upper gasket and a lower gasket, which can be fitted together.

[0075] Furthermore, at least one middle pad is provided between the upper pad and the lower pad, and the two sides of the middle pad can be fitted with the upper pad and the lower pad respectively, and the two middle pads can be fitted with each other.

[0076] Furthermore, the main cavity 66, the piston base plate 61, the sealing ring partition 63, the piston cover plate 65, the piston rod 612, and the flange 68 are all made of stainless steel.

[0077] Furthermore, the flange 68 and the working fluid inlet I are sealed by installing a flange flat gasket 617.

[0078] Furthermore, the piston rod 612 is provided with a scale for measuring the volume of the filling working fluid.

[0079] Furthermore, the piston seal ring I62, the piston seal ring II64, the V-shaped seal ring 69, and the flange flat gasket 617 are all made of polytetrafluoroethylene.

[0080] Example 2

[0081] The present invention also provides a working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device described in Example 1, for filling liquid working fluid, specifically including the following steps:

[0082] S1: Place the raw materials of the liquid working fluid in a glove box, prepare the high-temperature pulsating heat pipe working fluid in the glove box, and place it in a beaker for later use;

[0083] S2: Place the main chamber 66, piston, piston rod 612, flange 68, sealing assembly, packing nut 613, and vacuum valve III5 inside the glove box;

[0084] S3: Install vacuum valve III5 at the working fluid outlet of the main cavity 66 and close vacuum valve III5. According to the required high temperature pulsating heat pipe working fluid mass, pour the prepared high temperature pulsating heat pipe working fluid into the vertically placed main cavity 66 as needed. Then install the piston, piston rod 612, flange 68, sealing assembly and packing nut 613 on the main cavity 66.

[0085] S4: Tighten the packing nut 613 to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity 66 from the external environment;

[0086] S5: Transfer the installed working fluid storage unit 6 outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device.

[0087] S6: Turn on molecular pump unit 1, open vacuum valves I3, II4, and IV7, and evacuate the main chamber 66 until the vacuum level is less than 10. -3 After Pa, turn off molecular pump unit 1, and close vacuum valve II4 and vacuum valve IV7;

[0088] S7: Open vacuum valve III5. Under atmospheric pressure, the liquid working fluid is filled into the high-temperature pulsating heat pipe 2 by the main cavity 66. After the working fluid is filled, close vacuum valve I3.

[0089] Furthermore, step S3 also includes installing the support ring II 615 and the heat insulation ring 616; step S4 also includes tightening the piston rod 612 and controlling the thread depth of the mounting post into the piston rod 612, so that the piston cover plate 65 and the piston base plate 61 squeeze the piston sealing ring I 62 and the piston sealing ring II 64 to achieve effective sealing of the working fluid.

[0090] Furthermore, the liquid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point below room temperature.

[0091] Example 3

[0092] Based on Example 1, this example provides a novel high-temperature pulsating heat pipe working fluid filling device that can be used to fill solid working fluid, and also includes a heating unit;

[0093] The heating unit is used to heat the device for filling solid working fluid into the high-temperature pulsating heat pipe, and includes a heating plate, a cover plate 17, a liquid filling pipeline heating sleeve 13, and a working fluid storage unit heating sleeve 8.

[0094] The high-temperature pulsating heat pipe 2 is placed inside the cover plate 17, and the heating plate is used to cover the cover plate 17; the cover plate 17 has a receiving space inside for accommodating the high-temperature pulsating heat pipe 2 with a serpentine array structure.

[0095] The heating sleeve 13 of the filling pipeline is installed outside the filling pipeline and is used to heat the filling pipeline;

[0096] The heating sleeve 8 of the working fluid storage unit is installed on the lower outer side of the main cavity 66 and is used to heat the working fluid storage unit heating sleeve 8.

[0097] Furthermore, the heating unit also includes a temperature controller 14; the heating plate includes a terminal block III 15 and a thermocouple III 16; the liquid filling pipeline heating sleeve 13 includes a terminal block II 11 and a thermocouple II 12; the working fluid storage unit heating sleeve 8 includes a terminal block I 9 and a thermocouple I 10.

[0098] Thermocouple I10, thermocouple II12, and thermocouple III16 are used to monitor the surface temperature of the main cavity 66, the liquid filling pipeline, and the heating plate, respectively.

[0099] The terminal blocks I9, II11, III15, I10, II12, and III16 are electrically connected to the temperature controller 14. The temperature controller 14 is used to control the heating temperature of the working fluid storage unit heating sleeve 8, the filling pipeline heating sleeve 13, and the heating plate by controlling the terminal blocks I9, II11, and III15 according to the monitored surface temperatures of the main cavity 66, the filling pipeline, and the heating plate.

[0100] Furthermore, the maximum operating temperature of the novel high-temperature pulsating heat pipe working fluid filling device when filling solid working fluid is 280°C.

[0101] Furthermore, the temperature measuring thermocouple I10, the temperature measuring thermocouple II12 and the temperature measuring thermocouple III16 are K-type, T-type, N-type, E-type, R-type, S-type or J-type thermocouples.

[0102] Furthermore, after the heating plate and the cover plate 17 are combined, aluminum silicate insulation material for heat preservation is wrapped on the outer surfaces of the heating plate and the cover plate 17.

[0103] Example 4

[0104] The present invention also provides a working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device described in Example 3, for filling solid working fluid, specifically including the following steps:

[0105] S1: Place the raw materials of the solid working fluid in a glove box, prepare the high-temperature pulsating heat pipe solid working fluid in the glove box and heat it to melt it into a liquid state, then place it in a beaker for later use;

[0106] S2: Place the main chamber 66, piston, piston rod 612, flange 68, sealing assembly, packing nut 613, and vacuum valve III5 inside the glove box;

[0107] S3: Install vacuum valve III5 at the working fluid outlet of the main cavity 66 and close vacuum valve III5. According to the required high temperature pulsating heat pipe working fluid mass, pour the prepared high temperature pulsating heat pipe working fluid into the vertically placed main cavity 66 as needed. Then install the piston, piston rod 612, flange 68, sealing assembly and packing nut 613 on the main cavity 66.

[0108] S4: Tighten the packing nut 613 to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity 66 from the external environment;

[0109] S5: Transfer the installed working fluid storage unit 6 outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device, including the heating unit.

[0110] S6: Turn on molecular pump unit 1, open vacuum valves I3, II4, and IV7, and evacuate the main chamber 66 until the vacuum level is less than 10. -3 After Pa, turn off molecular pump unit 1, and close vacuum valve II4 and vacuum valve IV7;

[0111] S7: Set the heating temperature according to the melting point of the working fluid, turn on the power supply of the heating plate, the liquid filling pipeline heating sleeve 13 and the working fluid storage unit heating sleeve 8, and heat the high temperature pulsating heat pipe 2, the liquid filling pipeline and the lower part of the main cavity 66 so that the working fluid can be completely melted into a liquid state.

[0112] S8: Open vacuum valve III5. The molten working fluid is filled into the high-temperature pulsating heat pipe 2 by the main cavity 66 under atmospheric pressure. After the working fluid is filled, close vacuum valve I3. Turn off the power to the heating plate, the heating jacket 13 of the liquid filling pipeline and the heating jacket 8 of the working fluid storage unit to stop heating.

[0113] Furthermore, step S3 also includes installing the support ring II 615 and the heat insulation ring 616; step S4 also includes tightening the piston rod 612 and controlling the thread depth of the mounting post into the piston rod 612, so that the piston cover plate 65 and the piston base plate 61 squeeze the piston sealing ring I 62 and the piston sealing ring II 64 to achieve effective sealing of the working fluid.

[0114] Furthermore, the solid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point higher than room temperature.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel high-temperature pulsating heat pipe working fluid filling device, characterized in that, Includes working fluid storage units and vacuum units; The working fluid storage unit includes a main cavity and a detachable piston, piston rod, flange, and packing nut. The main cavity has a working fluid inlet I at the top and a working fluid outlet at the bottom. The flange is sealed to the working fluid inlet I and has a connecting neck. The packing nut is installed on the upper outer side of the connecting neck. The piston is located inside the main cavity. One end of the piston rod passes sequentially through the packing nut and the flange into the main cavity and is detachably connected to the piston. The connecting neck is provided with a sealing assembly that is in close contact with the piston rod. The sealing assembly is compressed by the pre-tightening of the packing nut, so that the sealing assembly forms a dynamic seal between the piston rod and the flange. The working fluid outlet is equipped with a vacuum valve III and is detachably connected to the working fluid inlet II of the high-temperature pulsating heat pipe via a filling pipeline; a vacuum valve I is installed on the filling pipeline, and the vacuum valve I and the vacuum valve III are connected by a three-way interface. The side opening of the three-way interface is connected to the molecular pump unit via a vacuum pumping pipeline II, and a vacuum valve II is installed on the vacuum pumping pipeline II. The vacuum unit includes the molecular pump unit; the molecular pump unit is detachably connected to the vacuum port at the top of the main cavity via a vacuum line I; a vacuum valve IV is installed on the vacuum line I.

2. The novel high-temperature pulsating heat pipe working fluid filling device according to claim 1, characterized in that, The piston includes a piston base plate, piston sealing ring I, sealing ring partition, piston sealing ring II, and piston cover plate arranged sequentially from bottom to top; the piston base plate is provided with a mounting post, and the piston sealing ring I, the sealing ring partition, the piston sealing ring II, and the piston cover plate are sequentially sleeved on the mounting post, and the piston rod is threadedly connected to the mounting post.

3. The novel high-temperature pulsating heat pipe working fluid filling device according to claim 1, characterized in that, The sealing assembly includes, from top to bottom, a pressure ring, a double-layer butterfly gasket, a support ring I, and a V-shaped sealing ring; a heat insulation ring is also provided inside the connecting neck, and the piston rod passes through the heat insulation ring; the heat insulation ring is located below the V-shaped sealing ring, and a support ring II is also provided between the V-shaped sealing ring and the heat insulation ring.

4. The novel high-temperature pulsating heat pipe working fluid filling device according to claim 3, characterized in that, The V-shaped sealing ring includes an upper gasket and a lower gasket, which can be fitted together; at least one middle gasket is also provided between the upper gasket and the lower gasket, and the two middle gaskets can be fitted together on both sides; the flange and the working medium inlet I are sealed by installing a flange flat gasket; the piston rod is provided with a scale for measuring the volume of the filling working medium.

5. The novel high-temperature pulsating heat pipe working fluid filling device according to claim 1, characterized in that, It also includes a heating unit, including a heating plate, a cover plate, a liquid filling pipeline heating sleeve, and a working fluid storage unit heating sleeve; The high-temperature pulsating heat pipe is placed inside the cover plate, and the heating plate is used to cover the cover plate; The heating sleeve for the filling pipeline is installed outside the filling pipeline and is used to heat the filling pipeline. The heating sleeve of the working fluid storage unit is installed on the lower outer side of the main cavity and is used to heat the heating sleeve of the working fluid storage unit.

6. The novel high-temperature pulsating heat pipe working fluid filling device according to claim 5, characterized in that, The heating unit further includes a temperature controller; the heating plate includes a terminal block III and a thermocouple III; the liquid filling pipeline heating sleeve includes a terminal block II and a thermocouple II; the working fluid storage unit heating sleeve includes a terminal block I and a thermocouple I. Thermocouple I, thermocouple II, and thermocouple III are used to monitor the surface temperatures of the main cavity, the liquid filling pipeline, and the heating plate, respectively. Terminal I, terminal II, terminal III, thermocouple I, thermocouple II, and thermocouple III are electrically connected to the temperature controller. The temperature controller is used to control terminal I, terminal II, and terminal III to adjust the heating temperature of the working fluid storage unit heating sleeve, the filling pipeline heating sleeve, and the heating plate based on the monitored surface temperatures of the main cavity, the filling pipeline, and the heating plate.

7. A working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device as described in claim 1, for filling liquid working fluid, specifically comprising the following steps: S1: Place the raw materials of the liquid working fluid in a glove box, prepare the high-temperature pulsating heat pipe working fluid in the glove box, and place it in a beaker for later use; S2: Place the main chamber, piston, piston rod, flange, sealing assembly, packing nut, and vacuum valve III inside the glove box; S3: Install vacuum valve III at the working fluid outlet of the main chamber and close vacuum valve III. Pour the prepared high-temperature pulsating heat pipe working fluid into the vertically placed main chamber as needed. Then install the piston, piston rod, flange, sealing assembly and packing nut on the main chamber. S4: Tighten the packing nut to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity from the external environment; S5: Transfer the installed working fluid storage unit outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device. S6: Turn on the molecular pump unit, open vacuum valves I, II, and IV to evacuate the main chamber until the vacuum level is less than 10. -3 After Pa, shut down the molecular pump unit and close vacuum valves II and IV. S7: Open vacuum valve III. Under atmospheric pressure, the liquid working fluid is filled into the high-temperature pulsating heat pipe from the main cavity. After the working fluid is filled, close vacuum valve I.

8. The working fluid filling method according to claim 7, characterized in that, The liquid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point below room temperature.

9. A working fluid filling method using the novel high-temperature pulsating heat pipe working fluid filling device as described in claim 5, for filling solid working fluid, specifically comprising the following steps: S1: Place the raw materials of the solid working fluid in a glove box, prepare the high-temperature pulsating heat pipe solid working fluid in the glove box and heat it to melt it into a liquid state, then place it in a beaker for later use; S2: Place the main chamber, piston, piston rod, flange, sealing assembly, packing nut, and vacuum valve III inside the glove box; S3: Install vacuum valve III at the working fluid outlet of the main chamber and close vacuum valve III. Pour the prepared high-temperature pulsating heat pipe working fluid into the vertically placed main chamber as needed. Then install the piston, piston rod, flange, sealing assembly and packing nut on the main chamber. S4: Tighten the packing nut to compress the sealing assembly, so that the sealing assembly forms a dynamic seal between the piston rod and the flange, thereby isolating the main cavity from the external environment; S5: Transfer the installed working fluid storage unit outside the glove box and assemble the overall new high-temperature pulsating heat pipe working fluid filling device, including the heating unit. S6: Turn on the molecular pump unit, open vacuum valves I, II, and IV to evacuate the main chamber until the vacuum level is less than 10. -3 After Pa, shut down the molecular pump unit and close vacuum valves II and IV. S7: Set the heating temperature according to the melting point of the working fluid, turn on the power supply of the heating plate, the heating jacket of the liquid filling pipeline and the heating jacket of the working fluid storage unit, and heat the high-temperature pulsating heat pipe, the liquid filling pipeline and the lower part of the main cavity so that the working fluid can be completely melted into a liquid state. S8: Open vacuum valve III. The molten working fluid is filled into the high-temperature pulsating heat pipe from the main cavity under atmospheric pressure. After the working fluid is filled, close vacuum valve I. Turn off the power to the heating plate, the heating jacket of the liquid filling pipeline and the heating jacket of the working fluid storage unit to stop heating.

10. The working fluid filling method according to claim 9, characterized in that, The solid working medium is an alloy formed by two or more metals selected from sodium, potassium, rubidium, and cesium, with a melting point higher than room temperature.

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