Parallel multi-stage sealed device of seawater phase change mass transfer device and preparation method
By combining the lifting mechanism and linear bearings with the heating control of the variable temperature base plate and heat-conducting metal strips, the problems of loose sealing and plate deformation in the hot-press sealing equipment are solved, and the stable connection and uniform heating of the seawater phase change mass transfer device are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN UNIV
- Filing Date
- 2026-03-06
- Publication Date
- 2026-05-19
AI Technical Summary
Existing hot-press sealing equipment suffers from insufficient parallelism of the hot-press plate and uneven heating during the hot-pressing process of large-area mass transfer membranes. This results in a loose seal between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate, and may also lead to adhesion and bending deformation of the plate.
A lifting mechanism and linear bearings are used to ensure the vertical movement of the pressure plate. Combined with the heat-conducting metal strips and polytetrafluoroethylene patches embedded in the temperature-controlled base plate, the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate are tightly and uniformly connected through frequency conversion heating and cooling water circulation control, thus avoiding material overheating and internal stress release.
This achieves a tight and uniform connection between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate, avoiding material decomposition and plate bending deformation, and ensuring the stability and performance of the sealing equipment.
Smart Images
Figure CN121798912B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of seawater phase change mass transfer devices, and specifically relates to a parallel multi-stage sealing device and its preparation method for seawater phase change mass transfer devices. Background Technology
[0002] The seawater phase change mass transfer device consists of a phase change mass transfer plate that allows the self-humidifying electrolyte to flow through and a hydrophobic and breathable mass transfer membrane that allows gaseous water molecules to pass through. The flow channels on both sides of the phase change mass transfer plate are sealed by the hydrophobic and breathable mass transfer membrane to prevent liquid seawater from entering the flow channels and mixing with the electrolyte. Only water molecules in the seawater are allowed to enter the electrolyte in gaseous form through the pores of the hydrophobic and breathable mass transfer membrane, thereby ensuring that impurity ions in the seawater are isolated while the electrolyte absorbs pure water molecules in the seawater.
[0003] A reliable seal between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate is a key technical issue in ensuring the isolation of seawater from the electrolyte. Current hot-press sealing equipment often suffers from insufficient parallelism of the hot-press plate and uneven pressure and temperature distribution due to uneven heat conduction during the hot-pressing of large-area mass transfer membranes. This results in inadequate hot-pressing of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate in areas of insufficient temperature, while degradation of the membrane material in areas of excessively high temperature affects the membrane's permeability, strength, and other physical properties. Under excessively high temperature or pressure, adhesion may occur between the membrane and the hot-pressing mold, affecting membrane quality. Furthermore, the large-area hot-pressing process makes it difficult to completely eliminate internal stress in the plate, causing bending deformation of the phase change mass transfer plate, thus affecting the installation and operation of the device. Summary of the Invention
[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a parallel multi-stage sealing device and preparation method for a seawater phase change mass transfer device.
[0005] The technical solution adopted in this invention is as follows:
[0006] A parallel multi-stage sealing device for seawater phase change mass transfer includes a support frame, a lifting mechanism installed inside the support frame, a pressure plate connected to the output end of the lifting mechanism, several linear bearings connected between the pressure plate and the support frame, a variable temperature base plate provided inside the support frame facing the pressure plate, a heat-conducting metal strip for heating and a flow channel for cooling the heat-conducting metal strip embedded in the variable temperature base plate, and a polytetrafluoroethylene patch attached to the surface of the variable temperature base plate.
[0007] A hydrophobic and breathable mass transfer membrane is placed on a polytetrafluoroethylene patch. The polytetrafluoroethylene patch is attached to one side of the hydrophobic and breathable mass transfer membrane, and a phase change mass transfer plate is attached to the other side. The heat-induced phase change sealing area of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate corresponds to the heat-conducting metal strip.
[0008] The parallel multi-stage sealing device for seawater phase change mass transfer of this invention ensures the vertical movement of the pressure plate through a lifting mechanism and several linear bearings, thereby ensuring that the pressure plate and the phase change mass transfer plate are parallel and that the phase change mass transfer plate is uniformly pressurized. An annular heat-conducting metal strip embedded in the variable-temperature base plate ensures uniform heating of the hot-pressing area between the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane, thus achieving a tight and uniform connection between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate.
[0009] The variable frequency heating and cooling water circulation rate control ensures the stability of the heating and cooling process, avoids material decomposition or excessive melting caused by local overheating, and avoids the difficulty in releasing internal stress caused by undercooling, thereby avoiding bending deformation of large-area phase change mass transfer plates.
[0010] As a preferred embodiment of the present invention, the support frame includes an upper sealing plate, a lower sealing plate, a plurality of support columns connected between the upper sealing plate and the lower sealing plate, a lifting mechanism installed on the lower side of the upper sealing plate, a linear bearing connected to the lower sealing plate, and a variable temperature base plate disposed on the lower sealing plate.
[0011] As a preferred embodiment of the present invention, the lifting mechanism includes a cylinder, the cylinder barrel of which is installed on the lower side of the upper sealing plate, and the piston rod of the cylinder is connected to the pressure plate.
[0012] As a preferred embodiment of the present invention, the linear bearing includes a plurality of guide columns, one end of which is fixed to the lower sealing plate, a sleeve is fitted on the guide column, the sleeve is fixed to the pressure plate, a fixing plate is fixed on the cylinder barrel, and the other end of the guide column is fixed to the fixing plate.
[0013] As a preferred embodiment of the present invention, a solid-state induction heater is also installed within the support frame, and the solid-state induction heater is electrically connected to the heat-conducting metal strip.
[0014] As a preferred embodiment of the present invention, a chiller is also installed inside the support frame, and the chiller is connected to the flow channel of the variable temperature base plate through a pipe.
[0015] A method for fabricating a seawater phase change mass transfer device includes the following steps:
[0016] S1: Place the hydrophobic and breathable mass transfer membrane on the polytetrafluoroethylene patch, with the polytetrafluoroethylene patch attached to one side of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate attached to the other side.
[0017] S2: Start the lifting mechanism. Under the positioning action of the linear bearing, the pressure plate presses down vertically on the phase change mass transfer plate, giving the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane a uniform downward pressure. The downward pressure of the pressure plate is 5 bar, pressing the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane together.
[0018] S3: The all-solid-state induction heating machine heats the heat-conducting metal strip inside the temperature-changing base plate. Through the frequency conversion power input, the temperature of the heat-conducting metal strip is raised from 30℃ to 90℃ and held for 60s. The molecular chain segments of the shallow polymer of the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane move. The molecular chains of the shallow polymer of the phase change mass transfer plate spread into the porous structure of the composite membrane, increasing the entanglement area.
[0019] S4: By adjusting the heating power of the all-solid-state induction heater and the cooling water rate of the chiller, the heat-conducting metal strip is cooled to 80°C;
[0020] S5: The temperature then rises from 80℃ to 180℃. After reaching the set heating temperature of 180℃, the cooling water enters the flow channel of the variable temperature base plate and circulates. By adjusting the heating power and cooling water rate, the temperature is kept constant at the rated hot-pressing temperature. The hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate within 0.5mm of the shallow polymer are fully melted for 90s, and the molecular chains intertwine with each other.
[0021] S6: Subsequently, the heating is turned off, and the temperature-controlled base plate is cooled to 40°C by controlling the cooling water circulation flow of the chiller to eliminate some of the internal stress;
[0022] S7: Finally, the seawater phase change mass transfer device is annealed for the second time. The pressure plate is set to 8 bar, and the heat-conducting metal strip is heated from 40°C to 90°C and maintained for 180 seconds. After eliminating the remaining internal stress, the temperature is slowly reduced to 30°C. Then, the seawater phase change mass transfer device is removed from the polytetrafluoroethylene patch.
[0023] Since the highest temperature does not reach the melting or decomposition temperature of the PTFE water-permeable layer, the properties of the hydrophobic and breathable mass transfer membrane, such as the porosity and strength, are guaranteed. At the same time, the anti-stick properties of the PTFE patch on the surface of the variable temperature base plate ensure the adhesion between the hydrophobic and breathable mass transfer membrane and the variable temperature base plate and the heat-conducting metal strip, respectively.
[0024] As a preferred embodiment of the present invention, in step S3, when the temperature of the heat-conducting metal strip is raised from 30°C to 90°C by frequency conversion power input, the temperature is uniformly increased at a rate of 1°C / s.
[0025] As a preferred embodiment of the present invention, in step S5, when the temperature rises from 80°C to 180°C, the temperature is increased uniformly at a rate of 1°C / s.
[0026] As a preferred embodiment of the present invention, in step S4, the heat-conducting metal strip is cooled to 80°C within 60 seconds; in step S6, the variable temperature base plate is cooled to 40°C within 800 seconds; and in step S7, the heat-conducting metal strip is heated from 40°C to 90°C within 60 seconds.
[0027] The beneficial effects of this invention are as follows:
[0028] 1. The parallel multi-stage sealing device for seawater phase change mass transfer of the present invention ensures the vertical movement of the pressure plate through a lifting mechanism and several linear bearings, thereby ensuring that the pressure plate and the phase change mass transfer plate are parallel and that the phase change mass transfer plate is uniformly pressurized. The annular heat-conducting metal strip embedded in the variable temperature base plate ensures uniform heating of the hot-pressing area between the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane, thereby achieving a tight and uniform connection between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate.
[0029] 2. This invention ensures the stability of the heating and cooling process by controlling the circulation rate of variable frequency heating and cooling water, avoiding material decomposition or excessive melting caused by local overheating, and avoiding the difficulty in releasing internal stress caused by overcooling, thereby avoiding bending deformation of large-area phase change mass transfer plates.
[0030] 3. This invention avoids the adhesion of the hydrophobic and breathable membrane material to the temperature-changing base plate during the hot pressing process by adding an anti-adhesion polytetrafluoroethylene patch to the temperature-changing base plate. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the structure of the present invention.
[0032] In the diagram: 1-Upper sealing plate; 2-Support column; 3-Lower sealing plate; 4-Cylinder; 5-Pressure plate; 6-Linear bearing; 7-Heat-conducting metal strip; 8-PTFE patch; 9-Variable temperature base plate; 10-All-solid-state induction heater; 11-Chiller. Detailed Implementation
[0033] 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 components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.
[0035] like Figure 1As shown, the parallel multi-stage sealing device for seawater phase change mass transfer in this embodiment includes a support frame, a lifting mechanism installed inside the support frame, a pressure plate 5 connected to the output end of the lifting mechanism, a plurality of linear bearings 6 connected between the pressure plate 5 and the support frame, a variable temperature base plate 9 provided on the side of the support frame facing the pressure plate 5, a heat-conducting metal strip 7 for heating and a flow channel for cooling the heat-conducting metal strip 7 embedded in the variable temperature base plate 9, and a polytetrafluoroethylene patch 8 attached to the surface of the variable temperature base plate 9.
[0036] A hydrophobic and breathable mass transfer membrane is placed on a polytetrafluoroethylene patch 8. One side of the hydrophobic and breathable mass transfer membrane is attached to the polytetrafluoroethylene patch 8, and the other side is attached to a phase change mass transfer plate. The thermally induced phase change sealing area of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate corresponds to the thermally conductive metal strip 7.
[0037] The support frame also houses a solid-state induction heater 10, which is electrically connected to the heat-conducting metal strip 7. A chiller 11 is also installed within the support frame, and is connected to the flow channel of the variable-temperature base plate 9 via a pipe.
[0038] Specifically, the support frame includes an upper sealing plate 1, a lower sealing plate 3, a plurality of support columns 2 connected between the upper sealing plate 1 and the lower sealing plate 3, a lifting mechanism installed on the lower side of the upper sealing plate 1, a linear bearing 6 connected to the lower sealing plate 3, and a variable temperature base plate 9 disposed on the lower sealing plate 3.
[0039] The lifting mechanism includes a cylinder 4, the cylinder barrel of which is installed on the lower side of the upper sealing plate 1, and the piston rod of the cylinder 4 is connected to the pressure plate 5. The linear bearing 6 includes several guide columns, one end of which is fixed to the lower sealing plate 3, a sleeve is fitted on the guide column, the sleeve is fixed to the pressure plate 5, a fixing plate is fixed on the cylinder barrel of the cylinder 4, and the other end of the guide column is fixed to the fixing plate.
[0040] The parallel multi-stage sealing device for seawater phase change mass transfer of the present invention ensures the vertical movement of the pressure plate 5 through a lifting mechanism and several linear bearings 6, thereby ensuring that the pressure plate 5 and the phase change mass transfer plate are parallel, and thus ensuring that the phase change mass transfer plate is uniformly pressurized. The annular heat-conducting metal strip 7 embedded in the temperature-varying base plate 9 ensures uniform heating of the hot-pressing area between the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane, thereby achieving a tight and uniform connection between the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate.
[0041] The variable frequency heating and cooling water circulation rate control ensures the stability of the heating and cooling process, avoids material decomposition or excessive melting caused by local overheating, and avoids the difficulty in releasing internal stress caused by undercooling, thereby avoiding bending deformation of large-area phase change mass transfer plates.
[0042] The fabrication method of the seawater phase change mass transfer device in this embodiment includes the following steps:
[0043] S1: Place the hydrophobic and breathable mass transfer membrane on the polytetrafluoroethylene patch 8, with the polytetrafluoroethylene patch 8 attached to one side of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate attached to the other side.
[0044] S2: Start cylinder 4. Under the positioning action of linear bearing 6, pressure plate 5 presses down vertically on phase change mass transfer plate, giving uniform downward pressure to phase change mass transfer plate and hydrophobic and breathable mass transfer membrane. The downward pressure of pressure plate 5 is 5 bar, pressing phase change mass transfer plate and hydrophobic and breathable mass transfer membrane together.
[0045] S3: The all-solid-state induction heating machine 10 heats the heat-conducting metal strip 7 inside the temperature-changing base plate 9. The heat-conducting metal strip 7 corresponds to the hot-press sealing area of the phase change mass transfer plate. The temperature of the heat-conducting metal strip 7 rises uniformly from 30℃ to 90℃ (60s, 1℃ / s) through frequency conversion power input and is maintained for 60s. The molecular chain segments of the shallow polymer of the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane move. The molecular chains of the shallow polymer of the phase change mass transfer plate spread into the porous structure of the composite membrane, increasing the entanglement area.
[0046] S4: The heat-conducting metal strip 7 is cooled to 80°C (60s) by adjusting the heating power of the all-solid-state induction heater 10 and the cooling water rate of the chiller 11.
[0047] S5: Subsequently, the temperature rises from 80℃ to 180℃ (100s, 1℃ / s). After reaching the set heating temperature of 180℃, the cooling water enters the flow channel of the variable temperature base plate 9 and circulates. By adjusting the heating power and cooling water rate, the temperature is kept constant at the rated hot-pressing temperature. The hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate within 0.5mm of the shallow polymer are fully melted for 90s, and the molecular chains interpenetrate with each other.
[0048] S6: Subsequently, the heating is turned off, and the variable temperature base plate 9 is cooled to 40°C (800s) at a certain rate by controlling the cooling water circulation flow of the chiller 11, thereby eliminating some of the internal stress;
[0049] S7: Finally, the seawater phase change mass transfer device is annealed for the second time. The pressure of the pressure plate 5 is set to 8 bar. The heat-conducting metal strip 7 is heated from 40°C to 90°C (60s) and maintained for 180s. After eliminating the remaining internal stress, the temperature is slowly reduced to 30°C. Then the seawater phase change mass transfer device is removed from the polytetrafluoroethylene patch 8.
[0050] Since the highest temperature does not reach the melting or decomposition temperature of the polytetrafluoroethylene water-permeable layer, the properties of the hydrophobic and breathable mass transfer membrane, such as the porosity and strength of the membrane, are guaranteed. At the same time, the anti-stick properties of the polytetrafluoroethylene patch on the surface of the variable temperature base plate 9 ensure the adhesion between the hydrophobic and breathable mass transfer membrane and the variable temperature base plate 9 and the heat-conducting metal strip 7, respectively.
[0051] It should be noted that the medium of the chiller 11 can be water, ethanol, or other media; the heating medium can be solid metal, steam, graphite sheets, etc.; the pressure source can be pneumatic, hydraulic, electromagnetic pressure, mechanical pressure, etc.
[0052] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.
Claims
1. A method for preparing a seawater phase change mass transfer device, characterized in that: The parallel multi-stage sealing device using seawater phase change mass transfer device includes a support frame, a lifting mechanism installed inside the support frame, a pressure plate (5) connected to the output end of the lifting mechanism, and several linear bearings (6) connected between the pressure plate (5) and the support frame. A variable temperature base plate (9) is provided on the side of the support frame facing the pressure plate (5). The variable temperature base plate (9) is embedded with a heat-conducting metal strip (7) for heating and a flow channel for cooling the heat-conducting metal strip (7). A polytetrafluoroethylene patch (8) is attached to the surface of the variable temperature base plate (9). A hydrophobic and breathable mass transfer membrane is placed on a polytetrafluoroethylene patch (8). One side of the hydrophobic and breathable mass transfer membrane is attached to the polytetrafluoroethylene patch (8), and the other side is attached to the phase change mass transfer plate. The thermally induced phase change sealing area of the hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate corresponds to the thermally conductive metal strip (7). A chiller (11) is also installed inside the support frame. The chiller (11) is connected to the flow channel of the variable temperature base plate (9) through a pipe. Includes the following steps: S1: Place the hydrophobic and breathable mass transfer membrane on the polytetrafluoroethylene patch (8), attach the polytetrafluoroethylene patch (8) to one side of the hydrophobic and breathable mass transfer membrane, and attach the phase change mass transfer plate to the other side. S2: Start the lifting mechanism. Under the positioning action of the linear bearing (6), the pressure plate (5) presses down vertically on the phase change mass transfer plate, giving the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane a uniform downward pressure. The downward pressure of the pressure plate (5) is 5 bar, pressing the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane together. S3: The all-solid-state induction heating machine (10) heats the heat-conducting metal strip (7) in the temperature-changing base plate (9). The temperature of the heat-conducting metal strip (7) is raised from 30°C to 90°C by the frequency conversion power input and held for 60s. The molecular chain segments of the shallow polymer of the phase change mass transfer plate and the hydrophobic and breathable mass transfer membrane move. The molecular chains of the shallow polymer of the phase change mass transfer plate spread into the porous structure of the hydrophobic and breathable mass transfer membrane, increasing the entanglement area. S4: The heat-conducting metal strip (7) is cooled to 80°C by adjusting the heating power of the all-solid-state induction heater (10) and the cooling water rate of the chiller (11); S5: The temperature then rises from 80°C to 180°C. After reaching the set heating temperature of 180°C, the cooling water enters the flow channel of the variable temperature base plate (9) and circulates. By adjusting the heating power and cooling water rate, the temperature is kept constant at the rated hot-pressing temperature. The hydrophobic and breathable mass transfer membrane and the phase change mass transfer plate within 0.5 mm of the shallow polymer are fully melted for 90 seconds, and the molecular chains interpenetrate with each other. S6: Subsequently, the heating is turned off, and the temperature-controlled base plate (9) is cooled to 40°C by controlling the cooling water circulation flow of the chiller (11) to eliminate some of the internal stress; S7: Finally, the seawater phase change mass transfer device is annealed for the second time. The pressure plate (5) is set to 8 bar, and the heat-conducting metal strip (7) is heated from 40°C to 90°C and maintained for 180s. After eliminating the remaining internal stress, the temperature is slowly reduced to 30°C. Then the seawater phase change mass transfer device is removed from the polytetrafluoroethylene patch (8).
2. The method for preparing a seawater phase change mass transfer device according to claim 1, characterized in that: In step S3, when the temperature of the heat-conducting metal strip (7) is raised from 30°C to 90°C by the frequency conversion power input, the temperature is uniformly increased at a rate of 1°C / s.
3. The method for preparing a seawater phase change mass transfer device according to claim 1, characterized in that: In step S5, when the temperature rises from 80°C to 180°C, the temperature is increased uniformly at a rate of 1°C / s.
4. The method for preparing a seawater phase change mass transfer device according to claim 1, characterized in that: In step S4, the heat-conducting metal strip (7) is cooled to 80°C within 60 seconds; in step S6, the temperature-changing base plate (9) is cooled to 40°C within 800 seconds; in step S7, the heat-conducting metal strip (7) is heated from 40°C to 90°C within 60 seconds.
5. The method for preparing a seawater phase change mass transfer device according to claim 1, characterized in that: The support frame includes an upper sealing plate (1), a lower sealing plate (3), and several support columns (2) connected between the upper sealing plate (1) and the lower sealing plate (3). A lifting mechanism is installed on the lower side of the upper sealing plate (1), a linear bearing (6) is connected to the lower sealing plate (3), and a temperature-changing base plate (9) is set on the lower sealing plate (3).
6. The method for preparing a seawater phase change mass transfer device according to claim 5, characterized in that: The lifting mechanism includes a cylinder (4), the cylinder barrel of which is installed on the lower side of the upper sealing plate (1), and the piston rod of the cylinder (4) is connected to the pressure plate (5).
7. The method for preparing a seawater phase change mass transfer device according to claim 6, characterized in that: The linear bearing (6) includes several guide columns. One end of the guide column is fixed to the lower sealing plate (3). A sleeve is fitted on the guide column and fixed to the pressure plate (5). A fixing plate is fixed on the cylinder barrel of the cylinder (4). The other end of the guide column is fixed to the fixing plate.
8. The method for preparing a seawater phase change mass transfer device according to claim 1, characterized in that: The support frame is also equipped with an all-solid-state induction heater (10), which is electrically connected to the heat-conducting metal strip (7).