Phase change type efficient evaporation and condensation device and working method thereof

Abstract

The invention discloses a phase change type efficient evaporation and condensation device and a working method thereof.The phase change type efficient evaporation and condensation device comprises an evaporation box and a condensation assembly, the top of the evaporation box and the top of the condensation assembly are jointly and fixedly provided with an upper flow plate, the bottom of the evaporation box and the bottom of the condensation assembly are jointly and fixedly provided with a backflow plate, and the evaporation box is filled with a low-boiling-point working medium; a plurality of capillary plates are vertically arranged in the evaporation box, and a plurality of first Tesla valve grooves are formed in the positions, located on the front faces of the capillary plates, in the evaporation box. The invention relates to the technical field of enhanced heat exchange. According to the phase change type efficient evaporation and condensation device and the working method thereof, dry burning is effectively avoided while low-boiling-point working media are guided upwards through the capillary plates, the heating area is increased, cooling circulation starting is accelerated, meanwhile, the first Tesla valve groove and the second Tesla valve groove are arranged in a matched mode, the vapor-liquid backflow disorder condition is avoided, and the working efficiency of the phase change type efficient evaporation and condensation device is improved. And the speed of vapor-liquid circulation can be increased, so that the export of heat is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of enhanced heat exchange, and in particular to a phase-change high-efficiency evaporation condensation device and a working method thereof. Background Art

[0002] With the development of science and technology, the heat flux density carried by industrial equipment has gradually increased. If the heat is not dissipated in time, the equipment temperature will be too high, which will seriously endanger the safe operation of the equipment. Especially in the fields of lasers, high-power substation equipment, 5G transmitter stations, renewable energy utilization and aerospace electronic equipment, the heat flux density of electronic equipment increases dramatically during the startup process. At this time, the heat must be discharged in time, otherwise it will easily lead to equipment failure.

[0003] As described in Application No. 202010412550.X, an inserted porous membrane vapor-liquid phase separation loop heat pipe cooling device and its working method utilize a porous membrane to suppress boiling instability, vapor-liquid separation to achieve liquid reflux, and fully wet the microchannel. The pure steam after vapor-liquid separation improves the condensation efficiency of the condenser, thereby reducing the temperature fluctuation of the multi-channel evaporator while improving the heat transfer efficiency of the radiator. However, in order to ensure an efficient condensation cycle of steam, low-boiling-point working fluids often do not fill the evaporator.

[0004] Based on the search of the above information, it can be seen that due to the different hot spots on the heating surface, when the hot spots are close to the upper part, dry burning occurs, and the vapor-liquid circulation cannot be carried out immediately and efficiently, that is, timely and effective cooling cannot be carried out. For this reason, a phase change high-efficiency evaporation and condensation device and a working method thereof are proposed. The low-boiling point working fluid is introduced onto the capillary plate to increase the heating area, accelerate the start of the cooling cycle, and effectively avoid the occurrence of dry burning. At the same time, the setting of the Tesla valve slot is used to avoid the occurrence of vapor-liquid reflux turbulence, and the speed of vapor-liquid circulation can be increased, thereby accelerating the heat extraction. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a phase-change high-efficiency evaporative condensing device and a working method thereof, which solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a phase-change high-efficiency evaporation and condensation device, comprising an evaporation box and a condensation assembly, wherein an upflow plate is fixedly installed on the top of the evaporation box and the condensation assembly, and a return plate is fixedly installed on the bottom of the evaporation box and the condensation assembly, and the interior of the evaporation box is filled with a low-boiling-point working medium;

[0007] A plurality of capillary plates are vertically arranged inside the evaporation box, and a plurality of first Tesla valve slots are opened inside the evaporation box and on the front of the capillary plates, wherein the first Tesla valve slots are used to control the steam of the low-boiling-point working medium to accelerate upward flow;

[0008] A second Tesla valve groove is provided inside the condensing component, and the second Tesla valve groove is used to control the steam of the low-boiling-point working medium to accelerate downward flow;

[0009] The upstream plate and the return plate are both provided with guide grooves connected with the first Tesla valve groove and the second Tesla valve groove.

[0010] The present invention is further configured as follows: the evaporation box comprises a sleeve frame and an embedded block, and the embedded block is inlaid and fixedly installed inside the sleeve frame;

[0011] A plurality of the first Tesla valve slots are provided on the back of the embedded block.

[0012] The present invention is further configured as follows: a plurality of female clamping strips are evenly fixedly installed on the back of the inner cavity of the sleeve frame, a plurality of capillary plates are respectively arranged on both sides of the female clamping strip, a male clamping strip is also fixedly installed on the back of the embedded block, and the male clamping strip is used in conjunction with the female clamping strip;

[0013] The top and bottom of the embedded block are respectively reserved with a first steam groove and a first working fluid groove, and the top and bottom of the back of the inner cavity of the sleeve frame are respectively reserved with a second steam groove connected to the first steam groove and a second working fluid groove connected to the first working fluid groove;

[0014] The second steam groove is connected to the guide groove in the upstream plate through an opening, and the second working medium groove is connected to the guide groove in the return plate.

[0015] The present invention is further configured as follows: the capillary plate is formed by sintering aluminum powder with a diameter of 150 microns and magnesium powder with a diameter of 33 microns in a mass fraction of 15% under pressure.

[0016] The present invention is further configured as follows: the condensing assembly includes a plurality of heat dissipation fins, and the second Tesla valve slot is disposed inside the heat dissipation fins;

[0017] The top and bottom of the heat dissipation fin plate are respectively fixedly connected to the opposite sides of the upstream plate and the return plate, and the two ends of the second Tesla valve slot are respectively connected to the guide slots of the upstream plate and the return plate.

[0018] The present invention is further configured as follows: a plurality of strip grooves are provided on both sides of the top of the heat dissipating fin plate, a square groove connected to the strip grooves is provided on the bottom of the upstream plate and the return plate, a moisture-absorbing cotton sheet is penetrated through the interior of the strip groove, the tops of a plurality of the moisture-absorbing cotton sheets penetrate the square grooves provided on the top, and are fixedly connected with a large cotton sheet together, a blind groove matched with the large cotton sheet is provided on the top of the upstream plate, and a stepped cover plate used in conjunction with the same is fixedly installed on the top of the blind groove.

[0019] The present invention is further configured as follows: a water tank is fixedly installed at the bottom of the return plate and at the periphery of the plurality of square grooves, the bottoms of the plurality of moisture-absorbing cotton sheets penetrate the square grooves and extend to the inside of the water tank, a plurality of hollow tubes are fixedly installed between the upstream plate and the return plate, a plurality of thick cotton strips are also fixedly installed at the bottom of the large cotton sheet, the bottom ends of the thick cotton strips pass through the upstream plate and the hollow tubes in sequence, and a return flow hole connected to the hollow tube is opened on the return plate;

[0020] The two sides of the water tank are respectively connected with a water inlet pipe with a valve and a water outlet pipe with a valve.

[0021] The present invention also discloses a working method of a phase-change high-efficiency evaporation and condensation device, which specifically comprises the following steps:

[0022] Step 1: The capillary plate draws the low-boiling-point working medium upward from the evaporator through capillary action. After the back of the evaporator is heated, the capillary plate transfers heat to make the low-boiling-point working medium boil and generate steam. Part of the steam is accelerated through the first Tesla valve slot into the first steam tank and then into the second steam tank. Part of the steam directly enters the second steam tank.

[0023] Step 2: The steam passes through the second steam groove and the guide groove of the upstream plate into the heat dissipation fin plate, and flows downward through the second Tesla valve groove to accelerate the flow. During the process, the steam condenses and enters the evaporation box through the guide groove of the return plate;

[0024] Step three, during the steam condensation process in step two, the hygroscopic cotton sheet absorbs the moisture in the water tank and transfers the moisture to the large cotton sheet. The steam heat is transferred to the hygroscopic cotton sheet through the heat dissipation fins. After the moisture absorbed in the hygroscopic cotton sheet evaporates to the large cotton sheet, it condenses through the thick cotton strip and drips through the reflux hole into the water tank.

[0025] The present invention provides a phase-change high-efficiency evaporation condensation device and a working method thereof, which has the following beneficial effects:

[0026] (1) The present invention utilizes the capillary plate to introduce low-boiling-point working fluid to increase the heating area, accelerate the start-up of the cooling cycle, and effectively avoid the occurrence of dry burning. At the same time, the first Tesla valve slot and the second Tesla valve slot are configured to avoid the occurrence of gas-liquid reflux turbulence, and the speed of gas-liquid circulation can be increased, thereby accelerating the extraction of heat.

[0027] (2) The present invention can improve the heat dissipation capacity of the radiating fins by utilizing the water absorption capacity of the hygroscopic cotton sheets through the coordination of the strip grooves, square grooves, hygroscopic cotton sheets, water tanks and large cotton sheets, so as to accelerate the efficiency of steam condensation. In addition, by coordinating the arrangement of the hollow tubes, thick cotton strips and reflux holes, the water evaporated from the hygroscopic cotton strips can be condensed and guided back to the water tank, thereby avoiding the waste of water resources. At the same time, with the coordinated arrangement of the valved water inlet pipe and the valved water outlet pipe, water circulation can be carried out through an external water pipe, thereby further improving the heat dissipation efficiency of the radiating fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the thin plate, the sleeve frame, the clamping mother bar, the second steam tank and the second working medium tank of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the first Tesla valve slot, the embedded block, the clamping bar, the first steam slot and the first working fluid slot of the present invention;

[0031] Figure 4 It is a cross-sectional view of the capillary plate, the first Tesla valve slot, the sleeve frame, the embedded block, the clamping female strip and the clamping male strip structure in a top view of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the condensation component of the present invention;

[0033] Figure 6 It is a schematic diagram of the connection structure of the second Tesla valve groove, the guide groove, the first steam groove and the second steam groove of the present invention;

[0034] Figure 7 It is a schematic diagram of the connection of the moisture-absorbing cotton sheet, the large cotton sheet, the blind groove and the thick cotton strip structure of the present invention;

[0035] Figure 8 It is a schematic diagram of the connection of the upflow plate, the return plate and the hollow tube structure of the present invention;

[0036] Fig. 9 It is a schematic diagram of the connection of the heat dissipation fin plate, the moisture-absorbing cotton sheet, the hollow tube and the thick cotton strip structure of the present invention;

[0037] Fig.10 It is a schematic structural diagram of the return plate of the present invention.

[0038] In the figure: 1. Evaporator; 2. Condensation assembly; 3. Upflow plate; 4. Return plate; 5. Capillary plate; 6. First Tesla valve slot; 7. Second Tesla valve slot; 8. Guide slot; 9. Frame; 10. Embedded block; 11. Snap-on female strip; 12. Snap-on male strip; 13. First steam slot; 14. First working fluid slot; 15. Second steam slot; 16. Second working fluid slot; 17. Heat dissipation fin plate; 18. Strip slot; 19. Square slot; 20. Moisture-absorbing cotton sheet; 21. Large cotton sheet; 22. Blind slot; 23. Step cover plate; 24. Water tank; 25. Hollow pipe; 26. Thick cotton strip; 27. Reflux hole; 28. Water inlet pipe with valve; 29. ​​Water outlet pipe with valve. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] See also Figure 1-10 , the embodiment of the present invention provides the following two technical solutions:

[0041] Embodiment 1

[0042] A phase-change high-efficiency evaporation-condensation device comprises an evaporation box 1 and a condensation assembly 2. In order to form a cyclic phase-change cooling loop, an upflow plate 3 is fixedly installed on the top of the evaporation box 1 and the condensation assembly 2, and a return plate 4 is fixedly installed on the bottom of the evaporation box 1 and the condensation assembly 2. The interior of the evaporation box 1 is filled with a low-boiling-point working medium, wherein the low-boiling-point working medium includes but is not limited to deionized water, acetone, FC-72, R123 and R1233zd.

[0043] As a preferred solution, in order to avoid the occurrence of dry burning and speed up the cooling start-up speed, the evaporator 1 includes a sleeve frame 9 and an embedded block 10. The embedded block 10 is embedded and fixedly installed inside the sleeve frame 9. A plurality of capillary plates 5 are vertically arranged inside the sleeve frame 9. The capillary plates 5 are sintered under pressure by aluminum powder with a diameter of 150 microns and magnesium powder with a mass fraction of 15% and a diameter of 33 microns. The capillary plates 5 have the effect of upward drainage, and can increase the contact area with the low-boiling-point working medium, thereby accelerating the evaporation rate of the low-boiling-point working medium.

[0044] As a preferred solution, in order to avoid reflux turbulence when steam is generated, a plurality of first Tesla valve grooves 6 are opened on the back of the embedded block 10, and a plurality of first Tesla valve grooves 6 are opened on the front of the capillary plate 5. The first Tesla valve grooves 6 are used to control the steam of the low-boiling-point working fluid to accelerate the upward flow.

[0045] Further explanation, in order to improve the stability of the assembly of the evaporator box 1, a plurality of snap-in female strips 11 are evenly fixedly installed on the back of the inner cavity of the sleeve frame 9, a plurality of capillary plates 5 are respectively arranged on both sides of the snap-in female strip 11, and a snap-in male strip 12 is also fixedly installed on the back of the embedded block 10, and the snap-in male strip 12 is used in conjunction with the snap-in female strip 11.

[0046] As a preferred solution, in order to achieve condensation of steam, the condensation component 2 includes a plurality of heat dissipation fins 17, and the top and bottom of the heat dissipation fins 17 are fixedly connected to the opposite sides of the upstream plate 3 and the return plate 4 respectively. In order to avoid reflux turbulence during steam condensation, a second Tesla valve slot 7 is opened inside the heat dissipation fin 17. The second Tesla valve slot 7 is used to control the steam of the low-boiling-point working fluid to accelerate the downward flow.

[0047] As a preferred solution, in order to achieve multi-channel condensation, a plurality of guide grooves 8 connected to the first Tesla valve groove 6 and the second Tesla valve groove 7 are provided inside the upstream plate 3 and the return plate 4 .

[0048] Further explanation, in order to ensure the smooth flow of low-boiling-point working fluid and the steam generated by it, the top and bottom of the embedded block 10 are respectively reserved with a first steam groove 13 and a first working fluid groove 14, and the top and bottom of the back of the inner cavity of the sleeve frame 9 are respectively reserved with a second steam groove 15 connected to the first steam groove 13 and a second working fluid groove 16 connected to the first working fluid groove 14. The second steam groove 15 is connected to the guide groove 8 in the upstream plate 3 through an opening, and the second working fluid groove 16 is connected to the guide groove 8 in the return plate 4.

[0049] In this embodiment, the capillary plate 5 is provided to avoid dry burning and realize rapid start of condensation and cooling. The first Tesla valve slot 6 and the second Tesla valve slot 7 cooperate to avoid reflux turbulence and accelerate the circulation speed of cooling and condensation to achieve the purpose of efficient cooling.

[0050] Embodiment 2

[0051] This embodiment is an improvement of the previous embodiment. A phase-change high-efficiency evaporative condensing device also includes a plurality of strip grooves 18 opened on both sides of the top of the heat dissipating fin plate 17. The bottoms of the upstream plate 3 and the return plate 4 are both provided with square grooves 19 connected to the strip grooves 18. The interior of the strip grooves 18 is penetrated by a hygroscopic cotton sheet 20. The tops of the plurality of hygroscopic cotton sheets 20 are all penetrated by the square grooves 19 set at the top, and are fixedly connected with a large cotton sheet 21. The top of the upstream plate 3 is provided with a blind groove 22 adapted to the large cotton sheet 21, and the top of the blind groove 22 is fixedly installed with a matching cotton sheet 21. A water tank 24 is fixedly installed at the bottom of the step cover plate 23 and the return plate 4 and at the outer periphery of the plurality of square grooves 19. The two sides of the water tank 24 are respectively connected with a valved water inlet pipe 28 and a valved water outlet pipe 29. The bottoms of a plurality of moisture-absorbing cotton sheets 20 pass through the square grooves 19 and extend to the interior of the water tank 24. A plurality of hollow tubes 25 are fixedly installed between the upstream plate 3 and the return plate 4. A plurality of thick cotton strips 26 are also fixedly installed at the bottom of the large cotton sheets 21. The bottom ends of the thick cotton strips 26 pass through the upstream plate 3 and the hollow tubes 25 in turn. A return flow hole 27 connected to the hollow tubes 25 is opened on the return plate 4.

[0052] The advantage of the second embodiment over the first embodiment is that it can also accelerate the cooling speed of the heat dissipation fins 17, and provide efficient support for the condensation of steam generated by the low-boiling-point working fluid.

[0053] A working method of a phase-change high-efficiency evaporation-condensation device specifically comprises the following steps:

[0054] Step 1: The capillary plate 5 draws the low-boiling-point working medium upward from the evaporation box 1 through capillary action. After the back of the evaporation box 1 is heated, the capillary plate 5 transfers heat to make the low-boiling-point working medium boil and generate steam. Part of the steam is accelerated through the first Tesla valve groove 6 to enter the first steam groove 13 and then enter the second steam groove 15. Part of the steam directly enters the second steam groove 15.

[0055] Step 2: The steam passes through the second steam groove 15 and the guide groove 8 of the upstream plate 3 into the heat dissipation fin plate 17, and flows downward through the second Tesla valve groove 7 to accelerate the flow. During the process, the steam condenses and enters the evaporation box 1 through the guide groove 8 of the return plate 4;

[0056] Step 3. During the steam condensation process in step 2, the hygroscopic cotton sheet 20 absorbs the moisture in the water tank 24 and transfers the moisture to the large cotton sheet 21. The steam heat is transferred to the hygroscopic cotton sheet 20 through the heat dissipation fins 17. After the moisture absorbed in the hygroscopic cotton sheet 20 evaporates to the large cotton sheet 21, it condenses through the thick cotton strip 26 and drips through the reflux hole 27 to enter the water tank 24.

[0057] As an extended explanation, by connecting the valved water inlet pipe 28 and the valved water outlet pipe 29 to the external water supply pipe and the return pipe respectively, the water in the water tank 24 can circulate, which can reduce the water temperature and further increase the cooling speed of the heat dissipating fin 17.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phase-change high-efficiency evaporation-condensation device, comprising an evaporation box (1) and a condensation assembly (2), characterized in that: An upflow plate (3) is fixedly mounted on the top of the evaporation box (1) and the condensation assembly (2), a return plate (4) is fixedly mounted on the bottom of the evaporation box (1) and the condensation assembly (2), and the interior of the evaporation box (1) is filled with a low-boiling-point working medium; A plurality of capillary plates (5) are vertically arranged inside the evaporation box (1), and a plurality of first Tesla valve slots (6) are opened inside the evaporation box (1) and on the front sides of the capillary plates (5), wherein the first Tesla valve slots (6) are used to control the steam of the low-boiling-point working medium to accelerate upward flow; A second Tesla valve groove (7) is provided inside the condensing component (2), and the second Tesla valve groove (7) is used to control the steam of the low-boiling-point working medium to accelerate downward flow; The upstream plate (3) and the return plate (4) are both provided with a guide groove (8) in communication with the first Tesla valve groove (6) and the second Tesla valve groove (7).

2. A phase-change high-efficiency evaporation and condensation device according to claim 1, characterized in that: The evaporation box (1) comprises a sleeve frame (9) and an embedded block (10), wherein the embedded block (10) is embedded and fixedly installed inside the sleeve frame (9); A plurality of the first Tesla valve slots (6) are all arranged on the back of the embedded block (10).

3. A phase-change high-efficiency evaporation and condensation device according to claim 2, characterized in that: A plurality of female clamping strips (11) are evenly fixedly installed on the back of the inner cavity of the sleeve frame (9), a plurality of capillary plates (5) are respectively arranged on both sides of the female clamping strip (11), and a male clamping strip (12) is also fixedly installed on the back of the embedded block (10), and the male clamping strip (12) is used in conjunction with the female clamping strip (11); The top and bottom of the embedded block (10) are respectively reserved with a first steam groove (13) and a first working fluid groove (14); the top and bottom of the back of the inner cavity of the sleeve frame (9) are respectively reserved with a second steam groove (15) connected to the first steam groove (13) and a second working fluid groove (16) connected to the first working fluid groove (14); The second steam groove (15) is connected to the guide groove (8) in the upstream plate (3) through an opening, and the second working medium groove (16) is connected to the guide groove (8) in the return plate (4).

4. A phase-change high-efficiency evaporation and condensation device according to claim 1, characterized in that: The capillary plate (5) is formed by sintering aluminum powder with a diameter of 150 microns mixed with 15% by mass of magnesium powder with a diameter of 33 microns under pressure.

5. A phase-change high-efficiency evaporation and condensation device according to claim 1, characterized in that: The condensing assembly (2) comprises a plurality of heat dissipation fins (17), and the second Tesla valve slot (7) is arranged inside the heat dissipation fins (17); The top and bottom of the heat dissipation fin plate (17) are respectively fixedly connected to the opposite sides of the upstream plate (3) and the return plate (4), and the two ends of the second Tesla valve groove (7) are respectively connected to the guide grooves (8) of the upstream plate (3) and the return plate (4).

6. A phase-change high-efficiency evaporation and condensation device according to claim 5, characterized in that: A plurality of strip grooves (18) are provided on both sides of the top of the heat dissipation fin plate (17); a square groove (19) communicating with the strip groove (18) is provided on the bottom of the upstream plate (3) and the return plate (4); a moisture-absorbing cotton sheet (20) is provided through the interior of the strip groove (18); the tops of a plurality of moisture-absorbing cotton sheets (20) pass through the square groove (19) provided on the top and are fixedly connected with a large cotton sheet (21); a blind groove (22) matching with the large cotton sheet (21) is provided on the top of the upstream plate (3), and a stepped cover plate (23) used in conjunction with the blind groove (22) is fixedly installed on the top of the blind groove (22).

7. A phase-change high-efficiency evaporation and condensation device according to claim 6, characterized in that: A water tank (24) is fixedly installed at the bottom of the return plate (4) and located on the outer periphery of the plurality of square grooves (19); the bottoms of the plurality of moisture-absorbing cotton sheets (20) penetrate the square grooves (19) and extend to the interior of the water tank (24); a plurality of hollow tubes (25) are fixedly installed between the upstream plate (3) and the return plate (4); a plurality of thick cotton strips (26) are also fixedly installed at the bottom of the large cotton sheet (21); the bottom ends of the thick cotton strips (26) pass through the upstream plate (3) and the hollow tubes (25) in sequence; and a return flow hole (27) is provided on the return plate (4) and is communicated with the hollow tubes (25); The two sides of the water tank (24) are respectively connected with a water inlet pipe (28) with a valve and a water outlet pipe (29) with a valve.

8. A working method of a phase-change high-efficiency evaporation and condensation device, characterized in that: The specific steps include: Step 1: The capillary plate (5) draws the low-boiling-point working medium upward from the evaporation box (1) through capillary action. After the back of the evaporation box (1) is heated, the capillary plate (5) transfers heat to make the low-boiling-point working medium boil, thereby generating steam. Part of the steam is accelerated through the first Tesla valve groove (6) to enter the first steam groove (13), and then enters the second steam groove (15), and part of the steam directly enters the second steam groove (15); Step 2: The steam passes through the second steam groove (15) and the guide groove (8) of the upstream plate (3) into the heat dissipation fin plate (17), and flows downward through the second Tesla valve groove (7) to accelerate the flow. During the process, the steam condenses and passes through the guide groove (8) of the return plate (4) into the evaporation box (1); Step 3. During the steam condensation process in step 2, the hygroscopic cotton sheet (20) absorbs the moisture in the water tank (24) and transfers the moisture to the large cotton sheet (21). The steam heat is transferred to the hygroscopic cotton sheet (20) through the heat dissipation fin plate (17). After the moisture absorbed by the hygroscopic cotton sheet (20) evaporates to the large cotton sheet (21), it condenses through the thick cotton strip (26) and drips through the reflux hole (27) to enter the water tank (24).

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