Drying filter, gas-liquid separation device and electrolytic hydrogen production device

Abstract

This utility model discloses a drying filter element, a gas-liquid separation device, and an electrolytic hydrogen production device, relating to the field of electrolytic hydrogen production technology. The drying filter element includes a base, a drying structure, and a filtering structure. The base has a mounting cavity, an inlet, and an outlet connected to the mounting cavity. The inlet is connected to the inlet pipeline, and the outlet is connected to the inlet end of the inlet pressure reducing valve. Both the drying structure and the filtering structure are located in the mounting cavity, with the filtering structure at least partially located on the side of the drying structure near the outlet. The technical solution provided by this utility model can reduce the risk of damage to analytical instruments due to the intrusion of liquid water and solid impurities.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic hydrogen production technology, and in particular to a drying filter element, a gas-liquid separation device, and an electrolytic hydrogen production device. Background Technology

[0002] In related technologies, the gas-liquid separation unit of a water electrolysis hydrogen production device is typically equipped with online analyzers for oxygen in oxygen and oxygen in hydrogen, with the test media being oxygen containing saturated water vapor and hydrogen containing saturated water vapor, respectively. Inadequate design of these gas-liquid separation devices makes the analyzers susceptible to damage from liquid water and solid impurities. Utility Model Content

[0003] The main purpose of this invention is to provide a drying filter, a gas-liquid separation device, and an electrolytic hydrogen production device, which aim to reduce the risk of analytical instruments being damaged by liquid water and solid impurities.

[0004] To achieve the above objectives, the present invention provides a drying filter element, which includes:

[0005] The base is provided with a mounting cavity, an air inlet and an air outlet connected to the mounting cavity, the air inlet being connected to an air inlet pipeline, and the air outlet being connected to the air inlet end of an air pressure reducing valve;

[0006] A drying structure is provided in the mounting cavity; and

[0007] A filter structure is provided in the mounting cavity, and the filter structure is at least partially provided on the side of the drying structure near the air outlet.

[0008] In one embodiment, the filtration structure includes a first filter element having a first filter screen, wherein the mesh size M1 of the first filter screen is in the range of 900 mesh ≤ M1 ≤ 1600 mesh.

[0009] In one embodiment, the mesh size M1 of the first filter screen is in the range of 1200 mesh ≤ M1 ≤ 1300 mesh.

[0010] In one embodiment, the first filter element is fixed to the cavity wall of the mounting cavity.

[0011] In one embodiment, the first filter element further includes a first substrate, the first filter screen is fixed to the first substrate, and is connected and fixed to the cavity wall of the mounting cavity through the first substrate.

[0012] In one embodiment, the first substrate has a plurality of first air passage holes distributed on its surface, and the diameter of the first air passage holes is larger than the diameter of the first filter screen.

[0013] In one embodiment, the first filter element is disposed at one end of the mounting cavity near the air outlet, and the first substrate is disposed on the side of the first filter screen near the air outlet.

[0014] In one embodiment, the filtration structure further includes a second filter element having a second filter screen, the second filter element being disposed at one end of the mounting cavity near the air inlet, and the first filter element being disposed at one end of the mounting cavity near the air outlet.

[0015] In one embodiment, the first filter element, the second filter element, and the cavity wall of the mounting cavity together enclose a receiving cavity, and the drying structure is disposed within the receiving cavity.

[0016] In one embodiment, the mesh count of the second filter is less than that of the first filter.

[0017] In one embodiment, the mesh size M2 of the second filter screen is in the range of 200 mesh ≤ M2 ≤ 400 mesh.

[0018] In one embodiment, the drying structure is configured as a desiccant, the desiccant comprising at least one of molecular sieves, activated alumina, and silica gel.

[0019] In one embodiment, the second filter element is detachably mounted on the cavity wall of the mounting cavity.

[0020] In one embodiment, the length of the receiving cavity extends along the distribution direction of the air inlet and the air outlet, and the length direction of the receiving cavity is installed in the vertical direction so that the second filter element is located above the receiving cavity.

[0021] In one embodiment, the base includes a tube and a first connector detachably mounted on the tube. The mounting cavity is located in the tube, and the air inlet is located in the first connector. The mounting cavity has a cavity inlet communicating with the air inlet, and the second filter and the drying structure can be installed and removed via the cavity inlet.

[0022] In one embodiment, the first connector is configured as a flange cover, the drying filter element further includes a flange, the end of the tube body is inserted into the mounting through hole of the flange, and the flange cover is connected to the flange by fasteners.

[0023] In one embodiment, the base includes a pipe flat-shoulder threaded connector, which includes a flat-shoulder connector, a threaded connector, and an outer nut. The outer nut is threadedly connected to the threaded connector, and the threaded connector is connected to the pipe body. The flat-shoulder connector is detachably connected to the threaded connector via the outer nut. The flat-shoulder connector is configured as the first connector.

[0024] In one embodiment, the base further includes a second connector, which is detachably mounted on the end of the pipe body away from the first connector, and the air outlet is located at the second connector.

[0025] This utility model also proposes a gas-liquid separation device, comprising:

[0026] The analytical instrument includes an analyzer body, an inlet pipeline, and an inlet pressure reducing valve connected in series, wherein the outlet of the inlet pressure reducing valve is connected to the inlet of the analyzer body; and

[0027] The aforementioned drying filter element has its air inlet connected to the air inlet pipeline, and its air outlet connected to the air inlet end of the air pressure reducing valve.

[0028] In one embodiment, the gas-liquid separation device further includes a gas guide line, one end of which is connected to the gas outlet, and the other end of which is connected to the gas inlet of the gas pressure reducing valve.

[0029] This utility model also proposes an electrolytic hydrogen production device, including the aforementioned drying and filtering element, or including the aforementioned gas-liquid separation device.

[0030] The technical solution of this utility model involves placing the drying filter upstream of the inlet pressure reducing valve. The gas to be tested can enter the mounting cavity through the inlet pipeline, undergo the drying effect of the drying structure and the filtration effect of the filter structure within the mounting cavity, and then flow to the inlet pressure reducing valve. If the gas to be tested contains liquid water and solid impurities, they will be absorbed and intercepted, thereby preventing liquid water and solid impurities from entering the inlet pressure reducing valve and electrical structure, and thus reducing the risk of damage to the analytical instrument due to the intrusion of liquid water and solid impurities. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 A cross-sectional view of an embodiment of the drying filter element provided by this utility model;

[0033] Figure 2 A half-sectional view of another embodiment of the drying filter element provided by this utility model.

[0034] Explanation of icon numbers:

[0035] 100. Base; 101. Mounting cavity; 102. Air inlet; 103. Air outlet; 110. Pipe body; 121. First connector; 122. Second connector; 131. Flange cover; 132. Flange; 133. First hole; 134. Second hole; 140. Pipe flat shoulder threaded connector; 141. Flat shoulder connector; 142. Threaded connector; 143. Outer nut;

[0036] 210, First filter element; 211, First filter screen; 212, First substrate; 220, Second filter element; 221, Second filter screen; 222, Second substrate;

[0037] 300. Dry structure;

[0038] 401. Intake line; 402. Air duct line.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0041] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0043] The gas-liquid separation unit of a water electrolysis hydrogen production plant typically includes online analyzers for oxygen-hydrogen and hydrogen-oxygen, with the analytes being oxygen containing saturated water vapor and hydrogen containing saturated water vapor, respectively. Inadequate design of the related gas-liquid separation device leads to the analyzers being susceptible to damage from liquid water and solid impurities.

[0044] Specifically, on the one hand, because the gas being tested contains saturated water vapor, liquid water may appear in the gas when the ambient temperature is low. If this liquid water intrudes into the internal electrical structure of the analyzer, it can damage the instrument. On the other hand, because the diameter of the analyzer's inlet line is too small, dead zones may occur during purging, leaving solid impurities inside the inlet line. If these solid impurities enter the analyzer's built-in inlet pressure reducing valve, it may damage the valve.

[0045] To address the issue of liquid water intruding into electrical structures, analytical instruments typically incorporate a simple drying tube after the intake pressure reducing valve. The desiccant within this tube absorbs the liquid water, preventing its intrusion. However, these instruments lack an effective solution for the problem of solid impurities damaging the intake pressure reducing valve.

[0046] In view of this, the present invention proposes a drying filter element for use in a gas-liquid separation device. The gas-liquid separation device includes an analytical instrument, which includes a connected air inlet pipeline, an air inlet pressure reducing valve, and an analyzer body. The outlet end of the air inlet pressure reducing valve is connected to the air inlet end of the analyzer body.

[0047] Please see Figure 1 In one embodiment of this utility model, the drying filter includes a base 100, a drying structure 300, and a filtering structure. The base 100 has a mounting cavity 101, an air inlet 102 and an air outlet 103 communicating with the mounting cavity 101. The air inlet 102 is connected to an air inlet pipeline 401, and the air outlet 103 is connected to the air inlet end of an air pressure reducing valve. Both the drying structure 300 and the filtering structure are located in the mounting cavity 101, with the filtering structure at least partially located on the side of the drying structure 300 near the air outlet 103.

[0048] Specifically, by placing the drying filter upstream of the inlet pressure reducing valve, the gas to be tested can enter the mounting cavity 101 through the inlet pipeline 401, undergo the drying effect of the drying structure 300 and the filtration effect of the filter structure within the mounting cavity 101, and then flow to the inlet pressure reducing valve. If the gas to be tested contains liquid water and solid impurities, they will be absorbed and intercepted, thereby preventing liquid water and solid impurities from entering the inlet pressure reducing valve and electrical structure, and thus reducing the risk of damage to the analytical instrument due to the intrusion of liquid water and solid impurities.

[0049] The base 100 can have various configurations. For example, the main body of the base 100 can be a pipe structure, a box structure, or a tank structure. For example, in one embodiment, the base 100 includes a pipe 110 and a connector connecting the pipe 110. The mounting cavity 101 is at least partially formed on the pipe 110, and the pipe 110 is connected to the air intake line 401 and the air intake pressure reducing valve through the connector.

[0050] Secondly, the filter structure can take various configurations. For example, the main body of the filter structure can be a filter screen, filter cotton, or filter membrane. For instance, in one embodiment, the filter structure includes a first filter element 210 with a first filter screen 211. The mesh size M1 of the first filter screen 211 ranges from 900 mesh to 1600 mesh. That is, M1 can be any value between 900 mesh and 1600 mesh, such as 900 mesh, 1000 mesh, 1100 mesh, 1200 mesh, 1300 mesh, 1400 mesh, 1500 mesh, or 1600 mesh. Thus, the first filter element 210 can intercept solid impurities with smaller particle sizes, which helps reduce the risk of small-particle solid impurities entering the intake pressure reducing valve.

[0051] Optionally, the mesh size M1 of the first filter 211 can be in the range of 1200 mesh ≤ M1 ≤ 1300 mesh, for example, it can be 1210 mesh, 1220 mesh, 1230 mesh, 1240 mesh, 1250 mesh, 1260 mesh, 1270 mesh, 1280 mesh, or 1290 mesh. Thus, in this embodiment, the first filter 211 can intercept particles with a diameter of 10 micrometers or larger, further reducing the risk of damage to the intake pressure reducing valve.

[0052] Optionally, the first filter element 210 is fixed to the cavity wall of the mounting cavity 101. There are various ways to fix the first filter element 210. For example, in one embodiment, the outer periphery of the first filter element 210 is welded and fixed to the cavity wall of the mounting cavity 101. This improves the installation reliability of the first filter element 210, enabling it to perform its filtering and interception function normally. Of course, in other embodiments, the first filter element 210 can also be detachably installed in the mounting cavity 101, for example, by being inserted into the mounting cavity 101 with an interference fit.

[0053] Please see Figure 1Optionally, the first filter element 210 further includes a first substrate 212, and the first filter screen 211 is fixed to the first substrate 212 and connected and fixed to the cavity wall of the mounting cavity 101 through the first substrate 212. Thus, by having the first substrate 212 responsible for the fixed connection of the first filter element 210, the risk of deformation or damage to the first filter screen 211 during installation can be reduced. Specifically, the first substrate 212 can be fixed to the cavity wall of the mounting cavity 101 by welding or bonding. Of course, in other embodiments, the first substrate 212 may be omitted, and the first filter screen 211 may be directly connected and fixed to the cavity wall of the mounting cavity 101.

[0054] Optionally, the first substrate 212 has a plurality of first air passage holes distributed on its surface, the diameter of which is larger than the diameter of the first filter screen 211. In this way, the first air passage holes allow the gas to be tested to pass through without significantly reducing the structural strength and rigidity of the first substrate 212. Of course, in other embodiments, the first substrate 212 may also be arranged in a ring-plate structure.

[0055] Please see Figure 1 Optionally, the first filter element 210 is disposed at one end of the mounting cavity 101 near the air outlet 103, and the first substrate 212 is disposed on the side of the first filter screen 211 near the air outlet 103. This facilitates the fixed connection operation, such as welding, between the first substrate 212 and the cavity wall of the mounting cavity 101. Of course, in other embodiments, the first filter element 210 may be disposed at one end of the mounting cavity 101 near the air inlet 102, or the first substrate 212 may be disposed on the side of the first filter screen 211 away from the air inlet 102.

[0056] Please see Figure 1 Optionally, the filter structure further includes a second filter element 220 with a second filter screen 221. The second filter element 220 is located at one end of the mounting cavity 101 near the air inlet 102, and the first filter element 210 is located at one end of the mounting cavity 101 near the air outlet 103. Thus, by providing filter structures at both ends of the mounting cavity 101, a secondary interception of solid particles can be achieved, further reducing the risk of solid particles entering the intake pressure reducing valve.

[0057] The second filter element 220 can be configured to have the same structure as the first filter element 210. That is, the second filter element 220 further includes a second substrate 222, and the second filter screen 221 is fixed to the second substrate 222 and mounted on the cavity wall of the mounting cavity 101 through the second substrate 222. Of course, in other embodiments, the second substrate 222 may not be provided, and the second filter screen 221 may be directly mounted on the cavity wall of the mounting cavity 101.

[0058] Please see Figure 1Optionally, the first filter element 210, the second filter element 220, and the cavity wall of the mounting cavity 101 together enclose a receiving cavity, and the drying structure 300 is disposed within the receiving cavity. In this embodiment, the first filter element 210 and the second filter element 220 also serve to constrain the drying structure 300 within the mounting cavity 101. Thus, the structure is simple and easy to implement. Of course, in other embodiments, the first filter element 210 and the second filter element 220 may both be disposed on the side of the drying structure 300 near the air outlet 103, that is, the first filter element 210 and the second filter element 220 may both be disposed downstream of the drying structure 300.

[0059] Optionally, the mesh count of the second filter 221 is less than that of the first filter 211. For example, the mesh count M2 of the second filter 221 can range from 200 mesh ≤ M2 ≤ 400 mesh. For example, it can be 220 mesh, 240 mesh, 260 mesh, 280 mesh, 300 mesh, 320 mesh, 340 mesh, 360 mesh, or 380 mesh. The first filter 210, with its lower mesh count, functions as a pre-filtration element, while the second filter 220, with its higher mesh count, functions as a fine filtration element. Thus, the second filter 220 primarily serves to confine the drying structure 300 within the receiving cavity; therefore, its mesh count M2 can be set lower to reduce the cost of the second filter 221. Of course, in other embodiments, the mesh count of the first filter 211 and the second filter 221 may be configured to be the same, or the value range of M2 may be other numerical ranges, such as 50 mesh ≤ M2 ≤ 150 mesh, or 450 mesh ≤ M2 ≤ 850 mesh.

[0060] Optionally, the drying structure 300 is configured with a desiccant, which includes at least one of molecular sieves, activated alumina, and silica gel. That is, the desiccant can be a single component or a mixture of multiple components. In this embodiment, the desiccant is a molecular sieve. This results in a simple structure and convenient filling and replacement.

[0061] As mentioned earlier, to address the issue of liquid water intruding into electrical structures, analytical instruments typically incorporate a simple drying tube after the inlet pressure reducing valve. However, this tube cannot prevent solid impurities from entering the valve. Furthermore, due to limited internal installation space, the drying tube's size and volume must be relatively small, resulting in a limited amount of desiccant. When the ambient temperature remains consistently low, causing the analyte gas to continuously contain liquid water, frequent desiccant replacements are necessary to maintain its water absorption efficiency, leading to cumbersome operation.

[0062] This embodiment of the technical solution is equivalent to reusing the basic structure of the drying tube and adding a filter structure to the drying tube to form a drying filter element. This drying filter element is positioned upstream of the inlet pressure reducing valve, so that it protects both the inlet pressure reducing valve from the intrusion and damage of solid impurities and the electrical structure inside the analyzer from the intrusion and damage of liquid water. Thus, the structure is simple and easy to implement, while also reducing the number of parts, assembly steps, and equipment costs of the gas-liquid separation device.

[0063] Secondly, in this embodiment, the drying filter can be disposed on the outside of the analyzer body. This eliminates the limitation of the internal installation space of the analyzer body, allowing the drying filter to be larger, thus increasing the volume of the receiving cavity and accommodating more desiccant. This reduces the frequency of desiccant replacement and simplifies equipment operation. Of course, in other embodiments, the drying filter can also be disposed within the internal space of the analyzer body.

[0064] Optionally, the second filter element 220 is detachably mounted on the cavity wall of the mounting cavity 101. Thus, when the drying structure 300 needs to be replaced, only the second filter element 220 needs to be removed, resulting in a simple structure and convenient replacement of the drying structure 300. Of course, in other embodiments, the second filter element 220 may also be fixed to the cavity wall of the mounting cavity 101, achieving convenient replacement of the drying structure 300 through other means. For example, the tube body 110 may be configured as two detachable tube sections, allowing the receiving cavity to be exposed for replacement of the drying structure 300 by disassembling the two sections.

[0065] Please see Figure 1 Optionally, the length of the receiving cavity extends along the distribution direction of the air inlet 102 and the air outlet 103, and the length direction of the receiving cavity is installed vertically so that the second filter element 220 is located above the receiving cavity. Thus, since the drying structure 300 is located below the second filter element 220, when the drying structure 300 needs to be replaced, accidental spillage of the existing drying structure 300 in the receiving cavity can be avoided when the second filter element 220 is opened, and the drying structure 300 can be easily filled into the tube 110 from top to bottom. Of course, in other embodiments, the second filter element 220 may also be located below the receiving cavity.

[0066] It should be noted that the length of the receiving cavity is installed along the vertical direction, meaning the drying filter element is installed vertically. This does not specifically mean the drying filter element is installed vertically; it can be installed at an angle relative to the horizontal plane, as long as it ensures that the second filter element 220 is located above the receiving cavity. For example, the length of the receiving cavity can form a 45° angle with the horizontal plane.

[0067] The relative positions of the inlet 102 and outlet 103 can vary. For example, in this embodiment, the inlet 102 is located above the outlet 103, and the gas to be tested flows from top to bottom through the drying filter. Specifically, the gas to be tested first flows through the inlet 102 through the second filter 220, then through the drying structure 300 located below the second filter 220, and finally flows out through the first filter 210 and out of the outlet 103. In this way, gravity can be used to promote the flow of the gas to be tested and reduce the flow resistance of the gas to be tested on the drying filter. Of course, in other embodiments, the inlet 102 can also be located below the outlet 103, and the gas to be tested flows from bottom to top through the drying filter.

[0068] Specifically, the tube body 110 can be made of seamless steel with an outer diameter of 45 mm and a wall thickness of 4 mm, and its length can range from 100 mm to 1000 mm, for example, 150 mm, 200 mm, 250 mm, or 300 mm. Thus, the volume of the accommodating cavity provided by the tube body 110 in this embodiment is significantly larger than the volume of the drying tube built into the analytical instrument in related technologies, thereby significantly extending the replacement cycle of the molecular sieve.

[0069] To facilitate the temporary removal of the drying filter element from the flow path of the gas-liquid separator for maintenance or replacement of the internal filter and drying structures 300, especially for replacing the drying structure 300, please refer to [link to relevant documentation]. Figure 1 Optionally, the base 100 includes a pipe body 110 and a first connector 121 detachably mounted on the pipe body 110. A mounting cavity 101 is located in the pipe body 110, and an air inlet 102 is located in the first connector 121. The mounting cavity 101 has a cavity inlet communicating with the air inlet 102, allowing the second filter element 220 and the drying structure 300 to be installed and removed via the cavity inlet. This design is simple and easy to operate and implement.

[0070] Specifically, when the drying structure 300 needs to be replaced, firstly, the first connector 121 is disassembled (at this time, the first connector 121 can maintain its connection with the intake pipe 401) so that the cavity inlet of the mounting cavity 101 is exposed. Then, the second filter element 220 is removed from the cavity inlet so that the drying structure 300 in the receiving cavity is exposed at the cavity inlet, thereby clearing the existing drying structure 300 in the receiving cavity. Then, the new drying structure 300 is filled into the receiving cavity, and the second filter element 220 is reinstalled at the cavity inlet to constrain the drying structure 300 in the receiving cavity. Finally, the first connector 121 is reinstalled into the pipe body 110.

[0071] The air inlet 102 is located at the first connector 121, meaning that the air intake line 401 is connected to the first connector 121. There are several possible connection methods. For example, the end of the air intake line 401 can be inserted into the air inlet 102 and welded together; that is, the air intake line 401 is welded and fixed to the first connector 121. The outer diameter of the air intake line 401 can be 8mm or 10mm, etc.

[0072] It is understood that the second filter element 220 can be detachably installed on the tube body 110 in various forms. For example, the second filter element 220 can be inserted into the mounting cavity 101 with an interference fit, or the second filter element 220 can be locked to the wall of the mounting cavity 101 with screws, or the periphery of the second filter element 220 can be engaged with the slot or protrusion on the inner surface of the mounting cavity 101, or other structural forms. This application does not make specific limitations on these.

[0073] The detachable installation of the pipe body 110 and the first connector 121 can take many forms; for example, please refer to... Figure 1 In one embodiment, the first connector 121 is configured as a flange cover 131, and the drying filter element also includes a flange 132. The end of the pipe body 110 is inserted into the mounting through hole of the flange 132, and the flange cover 131 is connected to the flange 132 by fasteners. For example, the flange cover 131 may have a plurality of first holes 134 spaced apart around its periphery, and the flange 132 may have second holes 133 corresponding to the first holes 134. The first holes 134 are connected to the second holes 133 by fasteners. The fasteners may be bolt and nut pairs or clips, etc. In this way, the structure is simple and easy to install and disassemble.

[0074] Please see Figure 2 In another embodiment, the base 100 includes a pipe shoulder threaded connector 140, which includes a shoulder connector 141, a threaded connector 142, and an outer nut 143. The outer nut 143 is threadedly connected to the threaded connector 142, which is connected to the pipe body 110. The shoulder connector 141 is detachably connected to the threaded connector 142 via the outer nut 143. The shoulder connector 141 is configured as a first connector 121. That is, in this embodiment, the first connector 121 is configured as one of the components of the pipe shoulder threaded connector 140 (i.e., the shoulder connector 141), and the first connector 121 is detachably installed with the pipe body 110 via the outer nut 143.

[0075] Specifically, when it is necessary to disassemble the first connector 121, the outer nut 143 is unscrewed to release the connection between the outer nut 143 and the threaded connector 142. Then the flat shoulder connector 141 can be separated from the threaded connector 142 (at this time, the flat shoulder connector 141 can maintain the connection with the air intake line 401), so that the outer port of the threaded connector 142 and the cavity inlet of the mounting cavity 101 are exposed. Then the second filter element 220 is removed from the cavity inlet and the outer port of the threaded connector 142 so that the drying structure 300 in the cavity can be cleared out from the cavity inlet and the outer port of the threaded connector 142.

[0076] Please see Figure 1 Optionally, the gas-liquid separation device further includes a gas guide line 402, one end of which is connected to the gas outlet 103, and the other end of which is connected to the gas inlet of the gas inlet pressure reducing valve. Thus, by adding the gas guide line 402, the relative positional relationship between the drying filter and the gas inlet pressure reducing valve can be easily adjusted. Of course, in other embodiments, the gas guide line 402 may not be provided.

[0077] Please see Figure 1 To allow the tube 110 to be detached from the gas-liquid separator 402 and temporarily removed from the gas-liquid separator, the base 100 may optionally include a second connector 122. The second connector 122 is detachably mounted on the end of the tube 110 furthest from the first connector 121, and the outlet 103 is located at the second connector 122. Thus, when the drying structure 300 needs to be replaced, both the first connector 121 and the second connector 122 can be disassembled, allowing the tube 110 to be temporarily removed from the gas-liquid separator, facilitating the replacement of the drying structure 300 within the tube 110. Of course, in other embodiments, the second connector 122 may not be included.

[0078] The air outlet 103 is located at the second connector 122, meaning that the air guide line 402 is connected to the second connector 122. There are several possible connection methods. For example, the end of the air guide line 402 can be inserted into the air outlet 103 and welded together; that is, the air guide line 402 is welded and fixed to the second connector 122. The outer diameter of the air guide line 402 can be 8mm or 10mm, etc.

[0079] Optionally, the second connector 122 may be configured to have the same structural form as the first connector 121, for example, see [link to relevant documentation]. Figure 1 In one embodiment, both the first connector 121 and the second connector 122 are configured as a flange cover 131; or, see [link to relevant documentation]. Figure 2In another embodiment, both the first connector 121 and the second connector 122 are configured as flat-shoulder connectors 141. Of course, in other embodiments, the structure of the second connector 122 may be configured differently from that of the first connector 121.

[0080] This utility model also proposes a gas-liquid separation device, which includes an analytical instrument and a drying filter element. The specific structure of the drying filter element is as described in the above embodiments. Since this gas-liquid separation device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The analytical instrument includes an analyzer body, an inlet pipeline, and an inlet pressure reducing valve connected together. The outlet of the inlet pressure reducing valve is connected to the inlet of the analyzer body. The inlet of the drying filter element is connected to the inlet pipeline, and the outlet of the drying filter element is connected to the inlet of the inlet pressure reducing valve.

[0081] Optionally, the gas-liquid separation device further includes a gas guide line 402, one end of which is connected to the gas outlet 103, and the other end of which is connected to the gas inlet of the gas inlet pressure reducing valve. Thus, by adding the gas guide line 402, the relative positional relationship between the drying filter and the gas inlet pressure reducing valve can be easily adjusted. Of course, in other embodiments, the gas guide line 402 may not be provided.

[0082] This utility model also proposes an electrolytic hydrogen production device, which includes a drying filter element. The specific structure of the drying filter element is as described in the above embodiments. Since this electrolytic hydrogen production device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0083] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A drying filter element, characterized in that, The drying filter element includes: The base is provided with a mounting cavity, an air inlet and an air outlet connected to the mounting cavity, the air inlet being connected to an air inlet pipeline, and the air outlet being connected to the air inlet end of an air pressure reducing valve; A drying structure is provided in the mounting cavity; and A filter structure is provided in the mounting cavity, and the filter structure is at least partially provided on the side of the drying structure near the air outlet.

2. The drying filter element as described in claim 1, characterized in that, The filtration structure includes a first filter element with a first filter screen, wherein the mesh size M1 of the first filter screen is in the range of 900 mesh ≤ M1 ≤ 1600 mesh.

3. The drying filter element as described in claim 2, characterized in that, The mesh size M1 of the first filter screen is in the range of 1200 mesh ≤ M1 ≤ 1300 mesh.

4. The drying filter element as described in claim 2, characterized in that, The first filter element is fixed to the cavity wall of the mounting cavity.

5. The drying filter element as described in claim 4, characterized in that, The first filter element further includes a first substrate, the first filter screen is fixed on the first substrate, and is connected and fixed to the cavity wall of the mounting cavity through the first substrate.

6. The drying filter element as described in claim 5, characterized in that, The first substrate has a plurality of first air passage holes distributed on its surface, and the diameter of the first air passage holes is larger than the diameter of the first filter screen.

7. The drying filter element as described in claim 5, characterized in that, The first filter element is disposed at one end of the mounting cavity near the air outlet, and the first substrate is disposed on the side of the first filter screen near the air outlet.

8. The drying filter element as described in claim 2, characterized in that, The filtration structure further includes a second filter element having a second filter screen, the second filter element being disposed at one end of the mounting cavity near the air inlet, and the first filter element being disposed at one end of the mounting cavity near the air outlet.

9. The drying filter element as described in claim 8, characterized in that, The first filter element, the second filter element, and the cavity wall of the mounting cavity together enclose a receiving cavity, and the drying structure is disposed within the receiving cavity.

10. The drying filter element as described in claim 8, characterized in that, The mesh count of the second filter is less than that of the first filter.

11. The drying filter element as described in claim 10, characterized in that, The mesh size M2 of the second filter screen is in the range of 200 mesh ≤ M2 ≤ 400 mesh.

12. The drying filter element as described in claim 9, characterized in that, The drying structure is configured with a desiccant, which includes at least one of molecular sieve, activated alumina, and silica gel.

13. The drying filter element as described in claim 9, characterized in that, The second filter element is detachably mounted on the wall of the mounting cavity.

14. The drying filter element as described in claim 13, characterized in that, The length of the receiving cavity extends along the distribution direction of the air inlet and the air outlet, and the length direction of the receiving cavity is installed in the vertical direction so that the second filter element is located above the receiving cavity.

15. The drying filter element as described in claim 13, characterized in that, The base includes a tube body and a first connector that can be detachably installed on the tube body. The mounting cavity is located in the tube body, and the air inlet is located in the first connector. The mounting cavity has a cavity inlet that communicates with the air inlet. The second filter and the drying structure can be installed and removed through the cavity inlet.

16. The drying filter element as described in claim 15, characterized in that, The first connector is configured as a flange cover, the drying filter element also includes a flange, the end of the tube body is inserted into the mounting through hole of the flange, and the flange cover is connected to the flange by fasteners.

17. The drying filter element as claimed in claim 15, characterized in that, The base includes a pipe flat shoulder threaded connector, which includes a flat shoulder connector, a threaded connector, and an outer nut. The outer nut is threadedly connected to the threaded connector, and the threaded connector is connected to the pipe body. The flat shoulder connector is detachably connected to the threaded connector via the outer nut. The flat shoulder connector is configured as the first connector.

18. The drying filter element as described in claim 15, characterized in that, The base also includes a second connector, which is detachably mounted on the end of the pipe body away from the first connector, and the air outlet is located at the second connector.

19. A gas-liquid separation device, characterized in that, include: An analytical instrument, comprising an analyzer body, an air inlet line, and an air inlet pressure reducing valve connected together, wherein the outlet of the air inlet pressure reducing valve is connected to the air inlet of the analyzer body; and The drying filter element as described in any one of claims 1 to 18, wherein the air inlet of the drying filter element is connected to the air inlet pipeline, and the air outlet of the drying filter element is connected to the air inlet end of the air inlet pressure reducing valve.

20. The gas-liquid separation device as described in claim 19, characterized in that, The gas-liquid separation device also includes a gas guide line, one end of which is connected to the gas outlet, and the other end of which is connected to the gas inlet of the gas inlet pressure reducing valve.

21. An electrolytic hydrogen production apparatus, characterized in that, It includes the drying filter element as described in any one of claims 1 to 18, or the gas-liquid separation device as described in claim 19 or 20.

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