Dehumidification valve, humidity control device and manufacturing method of dehumidification valve

Abstract

The present invention discloses a dehumidification valve, which includes a valve body, an anode pole ear pressed in the valve body by an annular valve cover, a membrane electrode, a cathode pole ear and an annular sealing gasket, wherein the membrane electrode includes a proton exchange membrane, an anode diffusion layer of a mesh structure composited on the side of the proton exchange membrane facing the anode pole ear, an anode catalyst layer infiltrated into the mesh of the anode diffusion layer and bonded to the proton exchange membrane, a cathode catalyst layer composited on the side of the proton exchange membrane facing the cathode pole ear, and a cathode diffusion layer composited on the side of the cathode catalyst layer facing away from the proton exchange membrane. The dehumidification valve of the present invention can actively discharge moisture in a sealed electronic device to prevent the occurrence of condensation. The present invention also discloses a humidity control device equipped with the above-mentioned dehumidification valve, which can adjust the humidity inside the sealed electronic device, and a manufacturing method capable of improving the yield rate of the above-mentioned dehumidification valve.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a dehumidification valve, a humidity control device and a manufacturing method of the dehumidification valve. Background Art

[0002] During the use of sealed electronic equipment, the internal temperature or external environmental pressure may change. In order to prevent the product from being damaged and extend its service life, it is usually necessary to open ventilation holes on its shell to allow it to "breathe". For sealed shells that need to meet a certain level of protection, products such as adhesive-backed breathable membranes, welded breathable membranes, and breathable valves are usually used to block the ventilation holes, so that the shell's protection level can meet specific usage requirements while ensuring micro-permeability.

[0003] Adhesive breathable membranes, welded breathable membranes and breathable valves can effectively balance the internal and external pressure differences of closed shells and reduce the occurrence of condensation. The main principle is: when the electronic equipment is cooled, the negative pressure generated due to the decrease in temperature can be effectively compensated by waterproof breathable products, so that the closed shell always maintains the pressure inside and outside the shell in a balanced state, thereby preventing external water vapor from being inhaled through the negative pressure formed by the system. This method of reducing condensation is a passive process that relies on environmental conditions and internal conditions of the shell.

[0004] However, when the system temperature reaches room temperature, the entire electronic device is in a natural equilibrium state, that is, the temperature, humidity, pressure, etc. inside and outside the shell are in a balanced state. When the external humidity is too high, such as in a humid basement, rainy season, rainy days, etc., the internal humidity of the closed electronic equipment in this environment will reach a state of equilibrium with the external humidity. If the moisture is condensed, the water droplets produced may damage the circuit structure of the electronic device. Summary of the invention

[0005] In response to the above problems, one of the objects of the present invention is to provide a dehumidification valve that can actively discharge moisture to prevent condensation. A second object of the present invention is to provide a humidity control device that can regulate the humidity inside a closed electronic device. A third object of the present invention is to provide a method for manufacturing a dehumidification valve to improve the yield rate of the dehumidification valve.

[0006] One of the purposes of the present invention is achieved through the following technical solutions:

[0007] A dehumidification valve comprises a valve body, an anode ear, a cathode ear, a membrane electrode, an annular sealing gasket and an annular valve cover; the valve body is provided with a step hole penetrating the upper and lower end surfaces of the valve body, the anode ear, the membrane electrode, the cathode ear and the annular sealing gasket are sequentially stacked in the step hole, and are pressed against the step surface of the step hole by the annular valve cover; the membrane electrode comprises: an anode catalyst layer, an anode diffusion layer, a proton exchange membrane, a cathode catalyst layer and a cathode diffusion layer; the anode diffusion layer is a mesh structure, the anode diffusion layer is compounded on the side of the proton exchange membrane facing the anode ear, the anode catalyst layer penetrates into the mesh of the anode diffusion layer and bonds to the proton exchange membrane, the cathode catalyst layer is compounded on the side of the proton exchange membrane facing the cathode ear, and the cathode diffusion layer is compounded on the side of the cathode catalyst layer facing away from the proton exchange membrane.

[0008] Preferably, the valve body is provided with a first limiting groove and a second limiting groove on the hole wall of the step hole, which penetrate the upper and lower end surfaces of the valve body; the anode electrode ear comprises: an anode conductive ring and an anode pin extending outward from one side of the anode conductive ring and bending downward, the anode conductive ring is superimposed on the step surface of the step hole, the anode pin is limited and fitted in the first limiting groove and extends downward from the valve body; the cathode electrode ear comprises: a cathode conductive ring and a cathode pin extending outward from one side of the cathode conductive ring and bending downward, the cathode conductive ring is superimposed on the membrane electrode, the cathode pin is limited and fitted in the second limiting groove and extends downward from the valve body.

[0009] Preferably, the annular valve cover comprises: an annular cover plate and a pressure ring connected to the lower end surface of the annular cover plate, the pressure ring is inserted into the step hole and pressed against the annular sealing gasket, the pressure ring is interference fit or threaded fit with the step hole; the outer side wall of the valve body is provided with an external thread.

[0010] The second object of the present invention is achieved by the following technical solutions:

[0011] A humidity control device comprises a bottom shell, a breathable membrane, a humidity controller, a humidity sensor and the dehumidification valve of the present invention; a dehumidification channel and a ventilation channel are respectively penetrated on both sides of the inside of the bottom shell, the dehumidification valve is installed at the bottom entrance of the dehumidification channel, the breathable membrane is installed on the top of the bottom shell, the breathable membrane covers the dehumidification channel and the ventilation channel and separates the dehumidification channel and the ventilation channel, the humidity controller and the humidity sensor are installed at the bottom of the bottom shell, and the humidity controller is electrically connected to the humidity sensor and the dehumidification valve respectively.

[0012] Preferably, it also includes an upper cover, which is installed on the top of the bottom shell, and a plurality of exhaust holes are opened through the upper cover. A mounting portion is provided on the circumference of the upper cover, and the bottom of the upper cover protrudes downward to form a card-embedded plate; a mounting groove is provided on the top of the bottom shell, and the breathable membrane is provided in the mounting groove, and the card-embedded plate is embedded in the mounting groove and presses the breathable membrane.

[0013] Preferably, a sealing layer is provided at the bottom of the breathable membrane, and the sealing layer is provided at least between the moisture removal channel and the air permeable channel to separate the moisture removal channel from the air permeable channel; a sink groove connected to the air permeable channel is provided in the installation groove, and a plurality of first support bars for supporting the breathable membrane are provided in the sink groove, and the top surface of each of the first support bars is flush with the bottom surface of the installation groove; a plurality of second support bars for supporting the breathable membrane are provided in the moisture removal channel, and the top surface of each of the second support bars is flush with the bottom surface of the installation groove.

[0014] The third object of the present invention is achieved by the following technical solutions:

[0015] A method for manufacturing a dehumidification valve, comprising preparing a membrane electrode and assembling the dehumidification valve;

[0016] The preparation method of the membrane electrode comprises:

[0017] S1: hot pressing an anode diffusion layer on the first surface of the proton exchange membrane, wherein the anode diffusion layer is a mesh structure and has an opening rate greater than or equal to 80%;

[0018] S2: coating or thermally transferring a cathode catalyst layer on the second side of the proton exchange membrane;

[0019] S3: hot pressing a cathode diffusion layer on the cathode catalyst layer;

[0020] S4: coating or thermally transferring an anode catalyst layer from the side of the anode diffusion layer facing away from the proton exchange membrane, wherein the anode catalyst layer penetrates into the mesh of the anode diffusion layer and bonds with the proton exchange membrane;

[0021] The assembly method of the dehumidification valve comprises: placing the anode pole ear, the membrane electrode, the cathode pole ear and the annular sealing gasket into the valve body in sequence, and pressing or screwing in the annular valve cover.

[0022] Preferably, in step S4, when the anode catalyst layer is transferred by thermal transfer, the anode catalyst layer on the transfer membrane includes a plurality of anode catalyst units, the plurality of anode catalyst units correspond one-to-one to the meshes of the anode diffusion layer, and the arrangement of the plurality of anode catalyst units on the transfer membrane is consistent with the mesh distribution of the anode diffusion layer.

[0023] Preferably, in the method for preparing the membrane electrode, a hot press is used for hot pressing and thermal transfer; the hot press comprises an upper mold and a lower mold, the bottom of the upper mold is provided with an upper pressing airbag, and the top of the lower mold is provided with a lower pressing airbag that cooperates with the upper pressing airbag, and the membrane electrode placed between the upper pressing airbag and the lower pressing airbag is evenly pressed by the upper pressing airbag and the lower pressing airbag.

[0024] Preferably, the method for preparing the membrane electrode comprises:

[0025] S1: unwinding the proton exchange membrane and the anode diffusion layer, and hot pressing the anode diffusion layer onto the lower surface of the proton exchange membrane through a first set of hot pressing rollers;

[0026] S2: unwinding the cathode catalyst layer and hot-pressing the cathode catalyst layer onto the upper surface of the proton exchange membrane through a second set of hot-pressing rollers, or coating the cathode catalyst layer on the upper surface of the proton exchange membrane through a first coating machine and drying it;

[0027] S3: unwinding the cathode diffusion layer and hot pressing the cathode diffusion layer onto the upper surface of the cathode catalyst layer; if there is a transfer film on the upper surface of the cathode catalyst layer, first peeling off and rolling up the transfer film on the upper surface of the cathode catalyst layer;

[0028] S4: After the proton exchange membrane is flipped and transported by the flip roller group, the anode catalyst layer is unwound and hot-pressed to the lower surface of the anode diffusion layer by the third group of hot pressing rollers, and the transfer film on the surface of the anode catalyst layer is cooled and peeled off, and then the membrane electrode is rolled up, or the anode catalyst layer is coated on the lower surface of the proton exchange membrane by the second coating machine, and the membrane electrode is rolled up after drying.

[0029] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0030] (1) The dehumidification valve of the present invention has a simple and compact structure and high dehumidification efficiency. It uses the principle of electrolytic dehumidification for active dehumidification. By applying direct current to the anode and cathode tabs, the anode catalyst layer of the membrane electrode can decompose the water vapor in the sealed electronic device into hydrogen ions and oxygen. The hydrogen ions are freed from one side of the proton exchange membrane to the other side, and react with oxygen in the air in the cathode catalyst layer to form water vapor, thereby discharging the moisture in the sealed electronic device, which can effectively prevent the occurrence of condensation in the device. The present invention optimizes the structure of the membrane electrode, and forms an anode diffusion layer with a composite mesh structure on one side of the proton exchange membrane. The anode diffusion layer improves the mechanical strength of the membrane electrode and increases the bonding strength between the anode catalyst layer and the proton exchange membrane. When the anode catalyst layer is transferred by the transfer method, the amount of the anode catalyst layer peeled off along with the transfer membrane can be reduced. When the anode catalyst layer is coated by the coating method, the proton exchange membrane can be prevented from absorbing water and swelling, which causes cracks on the surface of the anode catalyst layer.

[0031] (2) The humidity control device of the present invention combines active dehumidification with passive dehumidification. It performs active dehumidification through a dehumidification valve, and balances the pressure difference between the inside and outside of the sealed electronic device through a breathable membrane to prevent excessive negative pressure from forming inside the sealed electronic device, causing external water vapor to enter the sealed electronic device through the breathable membrane. It can also perform passive dehumidification when the air pressure inside the sealed electronic device is greater than the external air pressure, which is beneficial to improving the dehumidification efficiency. The humidity control device of the present invention can be installed in closed electronic devices that are sensitive to humidity, such as car lights, lithium battery packs, stage lights, cameras, electronic cameras, power cabinets, electrical control cabinets, switch cabinets, etc., and can regulate the humidity inside the electronic device, thereby effectively reducing the generation of condensation, extending the life of the electronic device, and improving the safety of the electronic device.

[0032] (3) The manufacturing method of the dehumidification valve of the present invention optimizes the preparation process of the membrane electrode. The mesh-structured anode catalyst layer is first hot-pressed on the proton exchange membrane, which plays a supporting role throughout the process, preventing the proton exchange membrane, the anode catalyst layer, and the cathode catalyst layer from being squeezed or pulled out of shape or even cracked during the hot pressing or roller pressing process of the membrane electrode. It also prevents the anode catalyst layer and the cathode catalyst layer from being swollen by water when the coating method is used to coat the anode catalyst layer and the cathode catalyst layer, causing cracks in the anode catalyst layer and the cathode catalyst layer, thereby affecting the performance and life of the membrane electrode, and reducing the amount of the anode catalyst layer peeled off along with the transfer membrane when the anode catalyst layer is transferred by the transfer method. The manufacturing method of the present invention improves the stability of the membrane electrode, which is conducive to improving the yield rate of the dehumidification valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the dehumidification valve of the first embodiment.

[0034] Figure 2 It is a schematic diagram of the explosion structure of the dehumidification valve of Example 1.

[0035] Figure 3 It is a schematic diagram of the half-section structure of the dehumidification valve of Example 1.

[0036] Figure 4 It is a schematic diagram of the half-section structure of the membrane electrode of Example 1.

[0037] Figure 5 for Figure 2 Schematic diagram of the middle membrane electrode viewed from above.

[0038] Figure 6 It is a schematic diagram of the three-dimensional structure of the humidity control device of the second embodiment.

[0039] Figure 7 It is a schematic diagram of the half-section structure of the humidity control device of the second embodiment.

[0040] Figure 8It is a bottom view schematic diagram of the humidity control device of the second embodiment.

[0041] Fig. 9 This is a schematic diagram of the sealing layer of the second embodiment being arranged between the moisture discharge channel and the air permeable channel.

[0042] Fig.10 This is a schematic diagram of the sealing layer of the second embodiment being arranged around the periphery of the moisture removal channel.

[0043] Fig.11 It is a schematic diagram of the installation of the humidity control device of the second embodiment in a closed casing.

[0044] Among them: 1. dehumidification valve; 11. valve body; 111. step hole; 112. first limit groove; 113. second limit groove; 114. external thread; 12. anode ear; 121. anode conductive ring; 122. anode pin; 13. membrane electrode; 131. anode catalyst layer; 1311. anode catalyst unit; 132. anode diffusion layer; 133. proton exchange membrane; 134. cathode catalyst layer; 135. cathode diffusion layer; 14. cathode ear; 141. cathode conductive ring; 142. cathode pin; 15 , annular sealing gasket; 16, annular valve cover; 161, annular cover plate; 162, pressure ring; 17, first sealing ring; 2, bottom shell; 21, dehumidification channel; 211, threaded hole; 22, air permeable channel; 23, mounting groove; 24, sinking groove; 25, first support bar; 26, second support bar; 27, first receiving groove; 28, second receiving groove; 3, breathable membrane; 31, sealing layer; 4, humidity controller; 5, humidity sensor; 6, upper cover; 61, exhaust hole; 62, mounting part; 63, card embedded plate; 7, closed shell. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Embodiment 1

[0047] like Figure 1 to Figure 5 As shown, the dehumidification valve 1 of this embodiment includes a valve body 11, an anode ear 12, a cathode ear 14, a membrane electrode 13, an annular sealing gasket 15 and an annular valve cover 16, wherein the valve body 11 is provided with a step hole 111 penetrating the upper and lower end surfaces of the valve body 11, and the anode ear 12, the membrane electrode 13, the cathode ear 14 and the annular sealing gasket 15 are stacked in the step hole 111 in sequence and are pressed against the step surface of the step hole 111 by the annular valve cover 16.

[0048] The dehumidification valve 1 of the present embodiment has a simple and compact structure and high dehumidification efficiency. It uses the electrolytic dehumidification principle to actively dehumidify. Compared with the passive dehumidification of the waterproof breathable membrane 3, the dehumidification valve 1 of the present embodiment is not affected by environmental factors such as temperature difference or high air humidity, and has stronger applicability. By providing an annular sealing gasket 15 to elastically treat the anode pole ear 12, the membrane electrode 13 and the cathode pole ear 14, it is possible to prevent the annular valve cover 16 from being loosely laminated due to tolerance problems, thereby ensuring that the anode pole ear 12, the membrane electrode 13 and the cathode pole ear 14 can be effectively in contact with each other to avoid affecting the electrolysis effect.

[0049] The membrane electrode 13 of this embodiment includes an anode catalyst layer 131, an anode diffusion layer 132, a proton exchange membrane 133, a cathode catalyst layer 134 and a cathode diffusion layer 135. Among them, the anode diffusion layer 132 is a mesh structure with an opening rate greater than or equal to 80%. The anode diffusion layer 132 is compounded on the side of the proton exchange membrane 133 facing the anode tab 12, the anode catalyst layer 131 penetrates into the mesh of the anode diffusion layer 132 and adheres to the proton exchange membrane 133, the cathode catalyst layer 134 is compounded on the side of the proton exchange membrane 133 facing the cathode tab 14, and the cathode diffusion layer 135 is compounded on the side of the cathode catalyst layer 134 facing away from the proton exchange membrane 133.

[0050] This embodiment optimizes the structure of the membrane electrode 13. The anode diffusion layer 132 with a composite mesh structure on one side of the proton exchange membrane 133 improves the mechanical strength of the membrane electrode 13 and the bonding strength between the anode catalyst layer 131 and the proton exchange membrane 133. When the anode catalyst layer 131 is transferred by the transfer method, the peeling strength between the anode catalyst layer 131 and the proton exchange membrane 133 and the anode diffusion layer 132 can be improved, and the peeling amount of the anode catalyst layer 131 with the transfer membrane can be reduced. When the anode catalyst layer 131 is coated by the coating method, the proton exchange membrane 133 is prevented from absorbing water and swelling to cause cracks on the surface of the anode catalyst layer 131. On the other hand, the anode catalyst layer 131 can be directly contacted with moisture in a closed electronic device, increasing the contact area between the anode catalyst layer 131 and the anode diffusion layer 132, and improving the electrolysis efficiency. In addition, the anode diffusion layer 132 with a mesh structure also divides the anode catalyst layer 131 into a number of independent catalytic reaction modules, which is conducive to improving the uniformity of the overall electrochemical reaction rate of the anode catalyst layer 131.

[0051] The anode catalyst layer 131 of this embodiment is obtained by coating or transferring the anode catalyst, and the loading amount of the anode catalyst is preferably 0.25-10 mg / cm 2. Among them, the anode catalyst can be selected from common anode catalysts on the market, such as iridium, platinum, ruthenium and their oxides. The thickness of the anode diffusion layer 132 is preferably 0.05-0.3 mm. The anode diffusion layer 132 preferably adopts a brushed mesh, a flat mesh, a diamond mesh, etc. The material of the anode diffusion layer 132 is preferably pure titanium, titanium alloy, pure titanium coated with a precious metal or its oxide coating, and a titanium alloy coated with a precious metal or its oxide coating. The cathode catalyst layer 134 is obtained by coating or transfer of the cathode catalyst, and the loading amount of the cathode catalyst is preferably 0.5-10 mg / cm 2 . The cathode catalyst can be selected from platinum black, carbon-supported platinum, iridium, and carbon-supported iridium commonly found on the market. The thickness of the cathode diffusion layer 135 is preferably 0.05 to 0.3 mm. The cathode diffusion layer 135 can be made of carbon paper, carbon cloth, or metal felt. The material of the anode ear 12 of this embodiment is preferably pure titanium, stainless steel plated with titanium, pure titanium plated with a precious metal or its oxide coating, or a titanium alloy. The material of the cathode ear 14 is preferably pure titanium, titanium alloy, stainless steel plated with platinum, aluminum, or an aluminum alloy.

[0052] In order to facilitate assembly and wiring, and to avoid the contact between the anode tab 12 and the cathode tab 14 and affect electrolysis. The valve body 11 of this embodiment is provided with a first limiting groove 112 and a second limiting groove 113 that penetrate the upper and lower end surfaces of the valve body 11 on the hole wall of the step hole 111. The anode tab 12 of this embodiment includes an anode conductive ring 121 and an anode pin 122 that extends outward from one side of the anode conductive ring 121 and bends downward. The anode conductive ring 121 is superimposed on the step surface of the step hole 111, and the anode pin 122 is limited and matched in the first limiting groove 112 and extends downward from the valve body 11. The cathode tab 14 of this embodiment includes a cathode conductive ring 141 and a cathode pin 142 that extends outward from one side of the cathode conductive ring 141 and bends downward. The cathode conductive ring 141 is superimposed on the membrane electrode 13, and the cathode pin 142 is limited and matched in the second limiting groove 113 and extends downward from the valve body 11. The first limiting groove 112 and the second limiting groove 113 limit the rotation of the anode pole ear 12 and the cathode pole ear 14 relative to the valve body 11, thereby facilitating the assembly of the dehumidification valve 1 and ensuring the dehumidification effect of the dehumidification valve 1.

[0053] The annular valve cover 16 of this embodiment includes an annular cover plate 161 and a pressure ring 162 connected to the lower end surface of the annular cover plate 161. The pressure ring 162 is inserted into the step hole 111 and pressed against the annular sealing gasket 15. The pressure ring 162 and the step hole 111 are interference fit or threaded fit.

[0054] The outer wall of the valve body 11 is provided with an external thread 114, and the valve body 11 is sleeved with a first sealing ring 17 that contacts the lower end surface of the annular cover plate 161, so as to install the dehumidification valve 1 and ensure the airtightness of the connection.

[0055] Embodiment 2

[0056] like Figure 6 to Figure 11 As shown, the humidity control device of this embodiment includes a bottom shell 2, a breathable membrane 3, a humidity controller 4, a humidity sensor 5 and a dehumidification valve 1 of the first embodiment. The bottom shell 2 has a dehumidification channel 21 and a ventilation channel 22 respectively penetrating the two sides inside, the dehumidification valve 1 is installed at the bottom entrance of the dehumidification channel 21, the breathable membrane 3 is installed on the top of the bottom shell 2, the breathable membrane 3 covers the dehumidification channel 21 and the ventilation channel 22, and separates the dehumidification channel 21 and the ventilation channel 22, the humidity controller 4 and the humidity sensor 5 are installed in the bottom shell 2, and the humidity controller 4 is electrically connected to the humidity sensor 5 and the dehumidification valve 1 respectively.

[0057] The humidity control device of the present invention combines active dehumidification and passive dehumidification. It performs active dehumidification through the dehumidification valve 1, and balances the pressure difference between the inside and outside of the closed electronic device through the breathable membrane 3. It can prevent excessive negative pressure from forming inside the closed electronic device, causing external water vapor to enter the closed electronic device through the breathable membrane 3, and can perform passive dehumidification when the internal air pressure of the closed electronic device is greater than the external air pressure, which is beneficial to improving the dehumidification efficiency.

[0058] The humidity control device of this embodiment can be installed in enclosed electronic devices such as car lights, lithium battery packs, stage lights, cameras, electronic cameras, power cabinets, electrical control cabinets, switch cabinets, etc. that are sensitive to humidity. It can regulate the humidity inside the enclosed electronic devices, thereby effectively reducing the generation of condensation, extending the life of the electronic devices, and improving the safety of the electronic devices. When in use, the humidity control device can be installed in the installation position on the enclosed housing 7 of the enclosed electronic device, such as Fig.11 shown.

[0059] In order to firmly install the humidity sensor 5 and the humidity controller 4 in the bottom shell 2, the present embodiment provides a first receiving groove 27 and a second receiving groove 28 at the bottom of the bottom shell 2. The humidity sensor 5 is arranged in the first receiving groove 27 and fixed to the bottom shell 2 by bolts, and the humidity controller 4 is arranged in the second receiving groove 28 and fixed to the bottom shell 2 by bolts. Thus, the humidity sensor 5 and the humidity controller 4 are not only firmly fixed to the bottom shell 2, but also have the advantage of easy disassembly. The humidity sensor 5 is electrically connected to the humidity controller 4, and the humidity controller 4 can be directly connected to an external DC power supply, or an internal power supply such as a battery is integrated in the humidity controller 4 to power it. The humidity controller 4 can use a common humidity controller 4 on the market (such as a humidity controller with a model of H6062, etc.), and the humidity controller 4 controls whether to supply power to the dehumidification valve 1, and the humidity sensor 5 keeps working, so that the humidity inside the electronic device can be monitored at any time.

[0060] The top of the bottom shell 2 is provided with a mounting groove 23, and the breathable membrane 3 is arranged in the mounting groove 23. A sinking groove 24 communicating with the breathable passage 22 is provided in the mounting groove 23, and a plurality of first support bars 25 for supporting the breathable membrane 3 are provided in the sinking groove 24, and the top surface of each first support bar 25 is flush with the bottom surface of the mounting groove 23. A plurality of second support bars 26 for supporting the breathable membrane 3 are provided in the dehumidification passage 21, and the top surface of each second support bar 26 is flush with the bottom surface of the mounting groove 23. After the breathable membrane 3 is arranged in the mounting groove 23, the breathable membrane 3 is overlapped on the first support bar 25 and the plurality of second support bars 26, and the phenomenon of collapse in the middle part of the breathable membrane 3 is avoided as much as possible.

[0061] In order to prevent the water vapor generated by electrolysis in the dehumidification channel 21 from entering the air permeable channel 22 and then returning to the inside of the sealed housing 7, a sealing layer 31 is provided at the bottom of the air permeable membrane 3. The sealing layer 31 is at least provided between the dehumidification channel 21 and the air permeable channel 22 to separate the dehumidification channel 21 from the air permeable channel 22. Fig. 9 In the embodiment, the sealing layer 31 is disposed between the moisture dissipation channel 21 and the air permeable channel 22 to separate the moisture dissipation channel 21 from the air permeable channel 22. Fig.10 In the embodiment, the sealing layer 31 surrounds the dehumidification channel 21 to seal the dehumidification channel 21. The sealing layer 31 is a sealing ring or a sealant. When the sealing layer 31 is a sealant, it is applied to the bottom of the breathable membrane 3. The breathable membrane 3 is fixed to the bottom of the mounting groove 23 by the sealant, so that the breathable channel 22 and the dehumidification channel 21 are not connected to each other, so as to prevent the water vapor discharged from the dehumidification channel 21 from entering the breathable channel 22 and returning to the closed electronic device.

[0062] This embodiment is also provided with an upper cover 6 for protecting the breathable membrane 3. The upper cover 6 is mounted on the top of the bottom shell 2. A plurality of exhaust holes 61 are formed through the surface of the upper cover 6. A mounting portion 62 that can be bolted to the sealed housing 7 is provided on the circumference of the upper cover 6. A card-embedded plate 63 is formed on the bottom of the upper cover 6, which protrudes downward. The shape and size of the card-embedded plate 63 match the shape and size of the mounting groove 23. When installing the upper cover 6, the card-embedded plate 63 at the bottom of the upper cover 6 is inserted into the mounting groove 23 of the bottom shell 2, so that the card-embedded plate 63 presses the breathable membrane 3.

[0063] The bottom inlet of the dehumidification channel 21 is configured as a threaded hole 211 that matches the external thread 114 on the outer side wall of the valve body 11 of the dehumidification valve 1 to facilitate the disassembly and assembly of the dehumidification valve 1 .

[0064] The working principle of the humidity control device of this embodiment is: the humidity controller 4 is connected to the power supply, the humidity inside the closed shell 7 is monitored by the humidity sensor 5, the humidity value monitored by the humidity sensor 5 is transmitted to the humidity controller 4, and the humidity controller 4 determines whether it is necessary to supply power to the dehumidification valve 1 to control the operation of the dehumidification valve 1.

[0065] When it is detected that the humidity in the sealed shell 7 is high (i.e., greater than a preset humidity value), the humidity controller 4 controls the dehumidification valve 1 to enter the working state, and the anode catalyst layer 131 of the membrane electrode 13 decomposes the water vapor in the sealed electronic device into hydrogen ions and oxygen. The hydrogen ions are freed from one side of the proton exchange membrane 133 to the other side, and react with oxygen in the outside air in the cathode catalyst layer 134 to form water vapor, thereby achieving the purpose of dehumidification. The water vapor generated by electrolysis enters the atmosphere through the breathable membrane 3. When the humidity in the sealed shell 7 is low (i.e., reduced to a certain humidity value), the humidity sensor 5 generates a signal again, and the humidity controller 4 stops supplying power to the dehumidification valve 1, and the dehumidification valve 1 stops working.

[0066] Embodiment 3

[0067] This embodiment discloses a method for manufacturing a dehumidification valve, which is used to prepare the dehumidification valve 1 of the first embodiment, and includes preparing a membrane electrode 13 and assembling the dehumidification valve 1 .

[0068] The preparation method of the membrane electrode 13 includes:

[0069] S1: hot pressing an anode diffusion layer 132 on the first surface of the proton exchange membrane 133, wherein the anode diffusion layer 132 is a mesh structure and has an opening rate greater than or equal to 80%;

[0070] S2: coating or thermally transferring the cathode catalyst layer 134 on the second surface of the proton exchange membrane 133;

[0071] S3: hot pressing the cathode diffusion layer 135 on the cathode catalyst layer 134;

[0072] S4: The anode catalyst layer 131 is coated or thermally transferred from the side 133 of the anode diffusion layer 132 facing away from the proton exchange membrane, and the anode catalyst layer 131 penetrates into the mesh of the anode diffusion layer 132 and bonds with the proton exchange membrane 133. In this step, a small amount of anode catalyst will remain on the surface of the anode diffusion layer 132 facing away from the proton exchange membrane 133, which does not affect the normal operation of the membrane electrode 13. When the anode catalyst layer 131 is transferred by the transfer method, the anode catalyst layer 131 on the transfer membrane includes a plurality of anode catalyst units 1311, and the plurality of anode catalyst units 1311 correspond to the mesh of the anode diffusion layer 132 one by one, and the arrangement of the plurality of anode catalyst units 1311 on the transfer membrane is consistent with the mesh distribution of the anode diffusion layer 132. The size of the anode catalyst unit 1311 matches the mesh size of the anode diffusion layer 132 or is slightly larger than the mesh size of the anode diffusion layer 132 to ensure that the anode catalyst unit 1311 in the mesh can adhere to the pore wall of the anode diffusion layer 132 after thermal transfer.

[0073] In a feasible option of the present embodiment, the above steps use a hot press to perform corresponding hot pressing and heat transfer operations. The hot press includes an upper mold and a lower mold, the bottom of the upper mold is provided with an upper pressing airbag, and the top of the lower mold is provided with a lower pressing airbag that cooperates with the upper pressing airbag. The membrane electrode 13 placed between the two is uniformly pressed by the upper pressing airbag and the lower pressing airbag. During the hot pressing process, the upper pressing airbag and the lower pressing airbag can adapt to the membrane electrode 13 and produce corresponding deformation, so that the membrane electrode 13 is uniformly pressed at all places during the hot pressing process, preventing the problem of local overpressure, and allowing the various layers of the membrane electrode 13 to be fully cross-linked and more tightly combined. In particular, when the anode catalyst layer 131 is thermally transferred by the transfer method, the pressing airbag can squeeze into each mesh of the anode diffusion layer 132, and the anode catalyst layer 131 that has penetrated into the mesh of the anode diffusion layer 132 is effectively hot-pressed on the proton exchange membrane 133.

[0074] When the hot press is working, the temperature is preferably 120 to 260° C., the pressure is preferably 5 to 30 MPa, and the hot pressing time is preferably 1 to 10 minutes.

[0075] In another feasible option of this embodiment, the above steps are implemented by using a roller rolling production line, and the specific steps are as follows:

[0076] S1: unwinding the proton exchange membrane 133 and the anode diffusion layer 132, and hot pressing the anode diffusion layer 132 onto the lower surface of the proton exchange membrane 133 by a first set of hot pressing rollers;

[0077] S2: unwinding the cathode catalyst layer 134 and hot-pressing the cathode diffusion layer 135 onto the upper surface of the proton exchange membrane 133 through a second set of hot-pressing rollers, or coating the cathode catalyst layer 134 on the upper surface of the proton exchange membrane 133 through a first coating machine and drying;

[0078] S3: unwinding the cathode diffusion layer 135 and hot pressing the cathode diffusion layer 135 onto the upper surface of the cathode catalyst layer 134; if there is a transfer film on the upper surface of the cathode diffusion layer 135, first peel off and rewind the transfer film on the upper surface of the cathode catalyst layer 134;

[0079] S4: The proton exchange membrane 133 is flipped and transported by the flip roller group so that the lower surface of the proton exchange membrane 133 faces upward, the anode catalyst layer 131 is unrolled and the anode catalyst layer 131 is hot-pressed to the lower surface of the proton exchange membrane 133 by the third group of hot pressing rollers, and the transfer film on the lower surface of the anode catalyst layer 131 is peeled off after cooling, and the membrane electrode 13 is rolled up, or the anode catalyst layer 131 is coated on the lower surface of the proton exchange membrane 133 by a second coating machine and dried, and the membrane electrode 13 is rolled up.

[0080] In this embodiment, the mesh-structured anode diffusion layer 132 is first hot-pressed on the proton exchange membrane 133, which plays a supporting role throughout the process, preventing the proton exchange membrane 133, the anode catalyst layer 131, and the cathode catalyst layer 134 from being squeezed or pulled out of shape, or even cracked, during the hot pressing or roller rolling process of the membrane electrode 13. When the anode catalyst layer 131 and the cathode catalyst layer 134 are coated by the coating method, the proton exchange membrane 133 can be prevented from absorbing water and swelling, causing cracks in the anode catalyst layer 131 and the cathode catalyst layer 134, which affects the performance and life of the membrane electrode 13. The surface of the anode diffusion layer 132 has a certain degree of roughness. When the anode catalyst layer 131 is transferred by the transfer method, the peeling strength of the anode catalyst layer 131 can be improved, the amount of the anode catalyst layer 131 peeled off with the transfer membrane can be reduced, and the transfer effect can be improved.

[0081] The assembly method of the dehumidification valve 1 includes: placing the anode tab 12 , the membrane electrode 13 , the cathode tab 14 and the annular sealing gasket 15 into the valve body 11 in sequence, and pressing or screwing in the annular valve cover 16 .

[0082] The membrane electrode 13 is a core component of the dehumidification valve 1 of this embodiment. The stability of the membrane electrode 13 is improved by the method of this embodiment, which is beneficial to improving the yield rate of the dehumidification valve 1.

[0083] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A dehumidification valve, characterized in that: include: A valve body (11), an anode electrode ear (12), a cathode electrode ear (14), a membrane electrode (13), an annular sealing gasket (15) and an annular valve cover (16); The valve body (11) is provided with a stepped hole (111) penetrating the upper and lower end surfaces of the valve body (11); the anode tab (12), the membrane electrode (13), the cathode tab (14) and the annular sealing gasket (15) are sequentially stacked in the stepped hole (111) and are pressed against the stepped surface of the stepped hole (111) by the annular valve cover (16); The membrane electrode (13) comprises: an anode catalyst layer (131), an anode diffusion layer (132), a proton exchange membrane (133), a cathode catalyst layer (134) and a cathode diffusion layer (135); the anode diffusion layer (132) is a mesh structure, and the anode diffusion layer (132) is compounded on the side of the proton exchange membrane (133) facing the anode pole ear (12); the anode catalyst layer (131) penetrates into the mesh of the anode diffusion layer (132) and adheres to the proton exchange membrane (133); the cathode catalyst layer (134) is compounded on the side of the proton exchange membrane (133) facing the cathode pole ear (14); and the cathode diffusion layer (135) is compounded on the side of the cathode catalyst layer (134) facing away from the proton exchange membrane (133); The method for manufacturing the dehumidification valve (1) comprises: preparing a membrane electrode (13) and assembling the dehumidification valve (1); The method for preparing the membrane electrode (13) comprises: S1: hot pressing an anode diffusion layer (132) on a first surface of a proton exchange membrane (133), wherein the anode diffusion layer (132) is a mesh structure and has an opening rate greater than or equal to 80%; S2: coating or thermally transferring a cathode catalyst layer (134) on the second surface of the proton exchange membrane (133); S3: hot pressing a cathode diffusion layer (135) on the cathode catalyst layer (134); S4: coating or thermally transferring the anode catalyst layer (131) from the side of the anode diffusion layer (132) facing away from the proton exchange membrane (133), wherein the anode catalyst layer (131) penetrates into the mesh of the anode diffusion layer (132) and bonds with the proton exchange membrane (133); The assembly method of the dehumidification valve (1) comprises: The anode tab (12), the membrane electrode (13), the cathode tab (14) and the annular sealing gasket (15) are sequentially placed into the valve body (11), and the annular valve cover (16) is pressed in or screwed in.

2. The dehumidification valve according to claim 1, characterized in that: In the step S4, the anode catalyst layer (131) is transferred by a thermal transfer method, the anode catalyst layer (131) on the transfer membrane comprises a plurality of anode catalyst units (1311), the plurality of anode catalyst units (1311) correspond one-to-one to the meshes of the anode diffusion layer (132), and the arrangement of the plurality of anode catalyst units (1311) on the transfer membrane is consistent with the mesh distribution of the anode diffusion layer (132).

3. The dehumidification valve according to claim 1 or 2, characterized in that: In the method for preparing the membrane electrode (13), a hot press is used for hot pressing and thermal transfer; The hot press comprises an upper die and a lower die, the bottom of the upper die is provided with an upper pressing airbag, and the top of the lower die is provided with a lower pressing airbag that cooperates with the upper pressing airbag, and the membrane electrode (13) placed between the upper pressing airbag and the lower pressing airbag is evenly pressed by the upper pressing airbag and the lower pressing airbag.

4. The dehumidification valve according to claim 1 or 2, characterized in that: In the step S1, the specific process of hot pressing the anode diffusion layer (132) on the first surface of the proton exchange membrane (133) is as follows: unwinding the proton exchange membrane (133) and the anode diffusion layer (132), and hot pressing the anode diffusion layer (132) onto the lower surface of the proton exchange membrane (133) by a first set of hot pressing rollers; In the step S2, the specific process of thermally transferring the cathode catalyst layer (134) on the second surface of the proton exchange membrane (133) is as follows: unwinding the cathode catalyst layer (134) and thermally pressing the cathode catalyst layer (134) onto the upper surface of the proton exchange membrane (133) by a second set of hot pressing rollers; The specific process of coating the cathode catalyst layer (134) on the second surface of the proton exchange membrane (133) is as follows: coating the cathode catalyst layer (134) on the upper surface of the proton exchange membrane (133) by a first coating machine and drying it; In the step S3, the specific process of hot pressing the cathode diffusion layer (135) on the cathode catalyst layer (134) is as follows: unwinding the cathode diffusion layer (135) and hot pressing the cathode diffusion layer (135) on the upper surface of the cathode catalyst layer (134); if a transfer film exists on the upper surface of the cathode catalyst layer (134), first peeling off and rolling up the transfer film on the upper surface of the cathode catalyst layer (134); In the step S4, the specific process of thermally transferring the anode catalyst layer (131) from the side of the anode diffusion layer (132) facing away from the proton exchange membrane (133) is as follows: after the proton exchange membrane (133) is flipped and transported by the flip roller group, the anode catalyst layer (131) is unwound and the anode catalyst layer (131) is hot-pressed onto the lower surface of the anode diffusion layer (132) by the third group of hot-pressing rollers; after the transfer film on the surface of the anode catalyst layer (131) is cooled and peeled off, the membrane electrode (13) is rolled up; The specific process of coating the anode catalyst layer (131) from the side of the anode diffusion layer (132) facing away from the proton exchange membrane (133) is as follows: coating the anode catalyst layer (131) on the lower surface of the proton exchange membrane (133) by a second coating machine, and rolling up the membrane electrode (13) after drying.

5. The dehumidification valve according to claim 1, characterized in that: The valve body (11) is provided with a first limiting groove (112) and a second limiting groove (113) penetrating the upper and lower end surfaces of the valve body (11) on the hole wall of the step hole (111); The anode tab (12) comprises: an anode conductive ring (121) and an anode pin (122) extending outward from one side of the anode conductive ring (121) and bending downward, the anode conductive ring (121) being superimposed on the step surface of the step hole (111), and the anode pin (122) being limitedly engaged in the first limit groove (112) and extending downwardly out of the valve body (11); The cathode tab (14) comprises: a cathode conductive ring (141) and a cathode pin (142) extending outward from one side of the cathode conductive ring (141) and bending downward; the cathode conductive ring (141) is stacked on the membrane electrode (13); and the cathode pin (142) is limitedly engaged in the second limit groove (113) and extends downward from the valve body (11).

6. The dehumidification valve according to claim 1, characterized in that: The annular valve cover (16) comprises: an annular cover plate (161) and a pressure ring (162) connected to the lower end surface of the annular cover plate (161); the pressure ring (162) is inserted into the step hole (111) and pressed against the annular sealing gasket (15); the pressure ring (162) and the step hole (111) are interference fit or thread fit; The outer wall of the valve body (11) is provided with an external thread (114).

7. A humidity control device, characterized in that: include: A bottom shell (2), a breathable membrane (3), a humidity controller (4), a humidity sensor (5), and a dehumidification valve (1) according to any one of claims 1 to 6; The bottom shell (2) has dehumidification channels (21) and ventilation channels (22) respectively extending through the two sides of the bottom shell (2); the dehumidification valve (1) is mounted at the bottom entrance of the dehumidification channel (21); the ventilation membrane (3) is mounted on the top of the bottom shell (2); the ventilation membrane (3) covers the dehumidification channel (21) and the ventilation channel (22), and separates the dehumidification channel (21) from the ventilation channel (22); the humidity controller (4) and the humidity sensor (5) are mounted on the bottom of the bottom shell (2); the humidity controller (4) is electrically connected to the humidity sensor (5) and the dehumidification valve (1), respectively.

8. The humidity control device according to claim 7, characterized in that: The upper cover (6) is mounted on the top of the bottom shell (2), a plurality of exhaust holes (61) are formed through the upper cover (6), a mounting portion (62) is provided on the periphery of the upper cover (6), and a card insert (63) is formed on the bottom of the upper cover (6) in a downwardly protruding manner; The top of the bottom shell (2) is provided with a mounting groove (23), the breathable membrane (3) is arranged in the mounting groove (23), and the embedded plate (63) is embedded in the mounting groove (23) and presses the breathable membrane (3).

9. The humidity control device according to claim 8, characterized in that: A sealing layer (31) is provided at the bottom of the breathable membrane (3), and the sealing layer (31) is at least provided between the moisture discharge channel (21) and the breathable channel (22), so as to separate the moisture discharge channel (21) from the breathable channel (22); The mounting groove (23) is provided with a sink groove (24) connected to the air permeable channel (22), and the sink groove (24) is provided with a plurality of first support bars (25) for supporting the air permeable membrane (3), and the top surface of each of the first support bars (25) is flush with the bottom surface of the mounting groove (23). The dehumidification channel (21) is provided with a plurality of second support bars (26) for supporting the air permeable membrane (3), and the top surface of each of the second support bars (26) is flush with the bottom surface of the mounting groove (23).

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