Filtering equipment and water electrolysis hydrogen production system

Abstract

The utility model discloses filtering equipment and a water electrolysis hydrogen production system, and relates to the technical field of filtering, the filtering equipment comprises a shell, a supporting piece, a first filtering piece, a liquid guide pipe and a liquid collecting container, the supporting piece, the first filtering piece, the liquid guide pipe and the liquid collecting container are arranged in the shell, the shell is provided with a filtering inlet and an exhaust port, the filtering inlet is located below the supporting piece, and the exhaust port is located below the liquid guide pipe. The exhaust port is located above the supporting piece, the upper side of the supporting piece is provided with a first bearing face used for bearing liquid, the first bearing face is provided with a first overflowing port, and the first filtering piece is located above the first bearing face; the liquid collecting container is located below the supporting piece, the upper end of the liquid guide pipe is communicated with the first overflowing opening, and the lower end of the liquid guide pipe is located below an opening of the liquid collecting container. According to the technical scheme provided by the invention, the gas-liquid separation efficiency of the filtering equipment is improved.

Description

Technical Field

[0001] This application relates to the field of filtration equipment technology, and in particular to a filtration device and a water electrolysis hydrogen production system. Background Technology

[0002] In some processes, such as water electrolysis for hydrogen production, it is necessary to filter the gas-liquid mixture through filtration equipment to separate the liquid and obtain a gaseous product with low liquid content. However, in related technologies, the gas-liquid separation efficiency of the filtration equipment is relatively low, resulting in a high liquid content in the gas discharged from the filtration equipment, which does not meet the requirements of the process. Utility Model Content

[0003] The main purpose of this application is to propose a filtration device and a water electrolysis hydrogen production system, which aims to improve the gas-liquid separation efficiency of the filtration device.

[0004] To achieve the above objectives, the filtration device proposed in this application includes:

[0005] The housing is equipped with a filter inlet and an exhaust outlet;

[0006] A support member is disposed inside the housing. The filter inlet is located below the support member, and the exhaust port is located above the support member. The upper side of the support member has a first receiving surface for receiving liquid, and the first receiving surface has a first flow outlet.

[0007] The first filter element is located above the first receiving surface; and

[0008] The liquid guide tube and the liquid collection container located below the support are provided. The upper end of the liquid guide tube is connected to the first flow port, and the lower end is located below the opening of the liquid collection container.

[0009] In one embodiment, the liquid collection container is connected to the liquid guide tube.

[0010] In one embodiment, the lower end of the liquid guide tube and the liquid collection container are connected by a pin.

[0011] In one embodiment, the filtration device is further provided with a second filter element located below the first filter element. The second filter element has a filtration section, which has at least a solid filtration function.

[0012] In one embodiment, the second filter element has a second receiving surface for receiving liquid, the second receiving surface is located below the filter part, and has a second flow port, the liquid guide tube has a branch section, the branch section is connected to the second flow port.

[0013] In one embodiment, the second filter element includes a first cylindrical portion and a second cylindrical portion distributed sequentially along the axial direction. The filter portion is disposed between the first cylindrical portion and the second cylindrical portion. The first cylindrical portion is connected to the first filter element, and the second cylindrical portion is connected to an end plate. The second receiving surface is located on the end plate.

[0014] In one embodiment, the filter section is configured as a sintered mesh assembly.

[0015] In one embodiment, the second filter element is located below the support element, and the filter portion is higher than the first receiving surface.

[0016] In one embodiment, the second filter element is connected to the support element.

[0017] In one embodiment, the support includes a first mounting portion and a second mounting portion. The outer periphery of the first mounting portion is connected to the housing, and the inner periphery of the first mounting portion is connected to the outer periphery of the second mounting portion via a connecting portion. The connecting portion extends downward relative to the first mounting portion, the first receiving surface is located on the second mounting portion, and the second filter element is connected to the first mounting portion. The filter element is disposed relative to the connecting portion.

[0018] In one embodiment, the support member is flat and its outer periphery is connected to the housing.

[0019] In one embodiment, the support includes a first mounting portion and a second mounting portion. The outer periphery of the first mounting portion is connected to the housing, and the inner periphery of the first mounting portion is connected to the outer periphery of the second mounting portion via a connecting portion. The connecting portion extends downward relative to the first mounting portion, and the first receiving surface is located on the second mounting portion.

[0020] In one embodiment, the first filter element is configured as a coalescing filter cartridge, and an installation cylinder is provided at the end of the first filter element. The first receiving surface is also provided with a third flow port, and the installation cylinder and the third flow port are connected to each other.

[0021] This application also proposes a water electrolysis hydrogen production system, including the aforementioned filtration equipment.

[0022] In this invention, the separated liquid from the gas-liquid mixture can be introduced into a collection container to achieve a liquid seal. Since the cross-sectional area of ​​the collection container is much smaller than that of the shell, the time required for the liquid level to rise to the liquid seal is very short, essentially not affecting the normal operation of the filtration equipment. Liquid overflowing from the collection container can continue to fall to the bottom of the shell under gravity, accumulating there without the need for additional drainage. Based on this, this invention enables more convenient and reliable drainage and liquid sealing, reduces leakage points in the filtration equipment by simplifying valve and pipeline configurations, improves the gas-liquid separation efficiency of the filtration equipment, ensures gas quality, and reduces the maintenance costs of downstream purification equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of an embodiment of the filtration device provided in this application;

[0025] Figure 2 A schematic diagram of another embodiment of the filtration device provided in this application;

[0026] Figure 3 A partial structural schematic diagram of an embodiment of the liquid seal mechanism of the filtration device provided in this application;

[0027] Figure 4 A schematic diagram of a structural embodiment of the filtration-related structure of the filtration device provided in this application;

[0028] Figure 5 This is a schematic diagram of a structure using a drain valve for draining liquid in related technologies;

[0029] Figure 6 This is a schematic diagram of a liquid drainage structure using a liquid guide tube in related technologies.

[0030] Explanation of icon numbers:

[0031] 100. Housing; 101. Filter inlet; 102. Exhaust port; 103. Drain valve; 104. Pressure monitoring port; 105. Liquid level monitoring port;

[0032] 200, Support component; 201, First receiving surface; 202, First flow port; 203, Third flow port; 210, First mounting part; 220, Second mounting part; 230, Connecting part;

[0033] 300. First filter element; 310. Mounting cylinder;

[0034] 410. Liquid guide tube; 411. Branch tube; 420. Liquid collection container; 430. Pin;

[0035] 500, Second filter element; 501, Second receiving surface; 502, Second flow port; 510, Filter section; 520, First cylindrical section; 530, Second cylindrical section; 540, End plate.

[0036] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that if the embodiments of this application 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.

[0039] Furthermore, if the embodiments of this application 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 that simultaneously satisfies A and B. 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 in this application.

[0040] This application proposes a filtration device.

[0041] Please see Figures 1 to 4 In one embodiment of this application, the filtration device includes:

[0042] The housing 100 is provided with a filter inlet 101 and an exhaust outlet 102;

[0043] A support member 200 is disposed inside the housing 100. The filter inlet 101 is located below the support member 200, and the exhaust port 102 is located above the support member 200. The upper side of the support member 200 has a first receiving surface 201 for receiving liquid, and the first receiving surface 201 has a first flow port 202.

[0044] The first filter element 300 is located above the first receiving surface 201; and

[0045] The liquid guide tube 410 and the liquid collection container 420 located below the support member 200, the upper end of the liquid guide tube 410 is connected to the first flow port 202, and the lower end is located below the opening of the liquid collection container 420.

[0046] In this invention, the gas-liquid mixture enters through the filter inlet 101. After being filtered by the first filter element 300, the liquid is separated and falls onto the first receiving surface 201 on the upper side of the support element 200. It then flows into the collection container 420 through the liquid guide pipe 410. When the liquid in the collection container 420 reaches a certain height, a liquid seal is achieved. The overflowing liquid in the collection container 420 can also be discharged to the bottom of the shell 100. Thus, the liquid generated on the upper side of the support element 200 can be discharged in a timely manner through the liquid guide pipe 410, which helps reduce the humidity in the area above the support element 200, thereby ensuring the filtration effect of the first filter element 300. Furthermore, due to the liquid seal, gas backflow is prevented, thus ensuring the air pressure in the area above the support element 200. This allows the gas-liquid mixture to be fully filtered at the first filter element 300, which helps to capture and coalesce finer droplets, thereby improving the gas-liquid separation effect.

[0047] For related technologies, please refer to Figure 5 The housing 100 is equipped with a drain valve 103, which is located above the support member 200. When the liquid level above the support member 200 reaches a certain height, the liquid is drained through the drain valve 103. However, this method increases the cost of the drain valve 103, pipelines and control system, and liquid will inevitably accumulate above the support member 200, affecting the humidity of that area.

[0048] For related technologies, please refer to Figure 6 The liquid guide tube 410 extends directly to a position near the bottom of the housing 100. By pre-filling a certain amount of liquid, the liquid accumulated inside the housing submerges the end of the liquid guide tube 410, achieving a liquid seal effect. However, this method also requires increased investment in valves, pipelines, and control systems to facilitate control of the liquid level inside the housing 100.

[0049] It should be noted that, Figure 5 and Figure 6 This is only for illustrating the two drainage methods mentioned above, and does not mean that other structures in the figure belong to the scope of existing technology, such as the setting of the support member 200, the first filter member 300, etc.

[0050] In this invention, the separated liquid from the gas-liquid mixture can be introduced into the collection container 420 to achieve a liquid seal. Since the cross-sectional area of ​​the collection container 420 is much smaller than that of the shell, the time required for the liquid level to rise to the liquid seal is very short, essentially not affecting the normal operation of the filtration equipment. Liquid overflowing from the collection container 420 can continue to fall to the bottom of the shell 100 under gravity, thus accumulating at the bottom of the shell 100 without the need for additional drainage. Based on this, this invention can more conveniently and reliably achieve drainage and liquid sealing, reduce leakage points in the filtration equipment by simplifying valve and pipeline settings, improve the gas-liquid separation efficiency of the filtration equipment, ensure gas quality, and reduce the operation and maintenance costs of downstream purification equipment.

[0051] The opening of the liquid collecting container 420 is also the overflow port. When the liquid in the liquid collecting container 420 reaches the opening, it overflows outward. The liquid collecting container 420 can be configured to be open upwards, which is the opening of the liquid collecting container 420. Alternatively, the opening can be set at a certain height on the side wall of the liquid collecting container 420. The liquid guide tube 410 needs to extend into the liquid collecting container 420, with its lower end lower than the opening of the liquid collecting container 420 but higher than the bottom wall of the liquid collecting container 420.

[0052] Please refer to the following: Figure 1 and Figure 2 The filter housing is also equipped with a pressure monitoring port 104. Pressure monitoring ports 104 are distributed both above and below the support member 200. By installing pressure monitoring devices at the pressure monitoring ports 104, the pressure difference between the upper and lower regions of the support member 200 is obtained. When the maximum allowable pressure difference is reached, the filter element is replaced or cleaned. It can be understood that as more impurities accumulate on the filter element, the pressure drop across the filter element will gradually increase. When the maximum allowable pressure difference is reached, it indicates that the filter element has accumulated sufficient impurities and needs to be cleaned or replaced to ensure efficient filtration operation.

[0053] Please refer to the following: Figure 1 and Figure 2 The housing of the filtration equipment is also equipped with a liquid level monitoring port 105. By setting a liquid level monitoring device in the liquid level monitoring port 105, a discharge signal is fed back according to the set value, so that the filtration equipment can discharge the accumulated liquid in the housing in a timely manner to ensure the efficient operation of the filtration.

[0054] In one embodiment, please refer to the following: Figure 1 and Figure 2 The liquid collection container 420 is connected to the liquid guide pipe 410. This allows the liquid collection container 420 to be hoisted via the liquid guide pipe 410, ensuring its installation stability. Simultaneously, the liquid collection container 420 and the liquid guide pipe 410 can be modularized, allowing them to be assembled as a single unit before being connected to other structures. It should be noted that the connection between the liquid guide pipe 410 and the liquid collection container 420 does not affect the inflow of liquid from the liquid guide pipe 410 into the liquid collection container 420, nor does it affect the outflow of liquid from the liquid collection container 420. Alternatively, the liquid collection container 420 can be suspended solely by the liquid guide pipe 410, or it can be fixed to the inner wall of the housing 100 and simultaneously connected to the liquid guide pipe 410. In this way, the housing 100 provides support for both the liquid guide pipe 410 and the liquid collection container 420. Of course, in other embodiments, the liquid collection container 420 may be fixed to the inner wall of the housing 100, and the liquid guide tube 410 may not be connected to the liquid collection container 420, but may extend into the liquid collection container 420.

[0055] In one implementation, please refer to Figure 3 The lower end of the liquid guide tube 410 and the liquid collection container 420 are connected by a pin 430. Specifically, two radially opposite through holes are formed on the side wall at the end of the liquid guide tube 410, and two corresponding radially opposite through holes are formed in the liquid collection container 420. The liquid guide tube 410 is inserted into the liquid collection container. By passing the pin 430 through these through holes in sequence and setting limiting structures at both ends of the pin 430 on the outside of the liquid collection container 420, the assembly of the liquid guide tube 410 and the liquid collection container 420 can be completed. Alternatively, one end of the pin 430 can have a head, and the other end can have a pin or a limiting ring, thus forming a limiting structure at both ends. Alternatively, both ends of the pin 430 can be welded to the side wall of the liquid collection container 420 to form a limiting structure. Of course, in other embodiments, a flange structure can also be provided in the liquid collection container 420 for the liquid guide tube 410 to be inserted.

[0056] Furthermore, to enhance the liquid seal effect, it is necessary to ensure that a certain level of liquid remains in the liquid collection container 420. Therefore, the mating gap between the liquid collection container 420 and the pin 430 can be sealed at the through-hole of the liquid collection container 420. Specifically, a seal can be installed at the mating point, or the two can be welded together. In this way, liquid will not flow out from the through-hole of the liquid collection container 420. The through-hole of the liquid guide pipe 410 does not need to be sealed; as long as the liquid level rises above the pin 430, a liquid seal can be achieved. Alternatively, the gap between the pin 430 and the liquid guide tube 410 can be sealed at the through hole of the liquid guide tube 410. In this way, when the liquid level of the liquid collection container 420 submerges the port of the liquid guide tube 410, a liquid seal can be achieved. If the mating gap between the pin 430 and the liquid collection container 420 is not sealed, a through hole should be provided at a higher position on the liquid collection container 420. Even if the liquid overflows from the through hole, a sufficiently high liquid level can be retained in the liquid collection container 420 to ensure the liquid seal function.

[0057] Without loss of generality, the liquid collection container 420 can be formed by machining a cylindrical wall with open ends and a bottom plate. The cylindrical wall and the liquid guide pipe 410 can be connected first by a pin 430, and then the bottom plate can be welded to the bottom side of the cylindrical wall.

[0058] The first filter element 300 can be installed on the first receiving surface 201 of the support 200 or on the housing 100, and is positioned relative to the first receiving surface 201.

[0059] In one implementation, please refer to Figure 1 The support member 200 is flat and its outer periphery is connected to the housing 100. Thus, a simple structure can be used to support other structures and to receive and drain liquids.

[0060] In one implementation, please refer to Figure 2 and Figure 4 The support member 200 includes a first mounting portion 210 and a second mounting portion 220. The outer periphery of the first mounting portion 210 is connected to the housing 100, and the inner periphery of the first mounting portion 210 is connected to the outer periphery of the second mounting portion 220 via a connecting portion 230. The connecting portion 230 extends downward relative to the first mounting portion 210, and the first receiving surface 201 is located on the second mounting portion 220. This improves the supporting function of the support member 200 and facilitates the cooperation of the second filter element 500 described later. In particular, when the first filter element 300 is installed on the first receiving surface 201, it lowers the center of gravity of the combined structure, which helps improve the installation stability of the first filter element 300. The various parts of the support member 200 can be separately formed and then connected by welding, or they can be integrally formed.

[0061] In one implementation, please refer to Figure 1 , Figure 2 and Figure 4 The first receiving surface 201 is also provided with a third flow port 203. The first filter element 300 is arranged corresponding to the third flow port 203. The gas-liquid mixture in the area below the support 200 flows through the third flow port 203 to the area above the support 200 and is filtered by the first filter element 300. Specifically, the first filter element 300 is configured as a coalescing filter element. The end of the first filter element 300 is provided with a mounting cylinder 310, which is connected to the third flow port 203. When gas containing tiny droplets flows through the coalescing filter element, these droplets are first captured by the surface of the filter material. As more droplets are captured, they meet and merge between the filter material fibers or in the pores, forming larger droplets. The larger droplets formed will slide down the outer wall of the filter element due to gravity and finally fall onto the first receiving surface 201, achieving the purpose of gas-liquid separation. The gas-liquid separation efficiency of the coalescing filter element is better than that of traditional wire mesh droplet trapping and removal, which is beneficial to improving the gas-liquid separation efficiency of the filtration equipment.

[0062] In one implementation, please refer to Figure 2 and Figure 4 The filtration device is further equipped with a second filter element 500, located below the first filter element 300. The second filter element 500 has a filtration section 510, which has at least a solid filtration function. Thus, when solid impurities are mixed in the gas-liquid mixture, the solid impurities can be filtered out by the filtration section 510, thereby improving the purity of the gas discharged from the exhaust port 102. Especially for water electrolysis hydrogen production systems, fluctuating operating conditions can accelerate the shedding of the electrode plating in the electrolyzer, easily leading to impurities from the shed electrode plating mixed in with the electrolysis products. Filtering these impurities by the filtration section 510 can prevent solid impurities from clogging the first filter element 300. Of course, in other embodiments, a solid filtration device can also be installed at the front end of the filtration inlet 101 of the filtration device.

[0063] In one implementation, please refer to Figure 2 and Figure 4 The second filter element 500 has a second receiving surface 501 for receiving liquid. The second receiving surface 501 is located below the filter section 510 and has a second flow port 502. The second flow port 502 is connected to a container for collecting liquid via a pipe. Thus, when the gas-liquid mixture flows through the second filter element 500, a certain degree of gas-liquid separation occurs. The separated liquid can fall onto the second receiving surface 501 and be discharged into the corresponding container through the second flow port 502. This provides a drainage function while also achieving a liquid seal function to ensure the gas-liquid separation efficiency of the filtration equipment.

[0064] In one implementation, please refer to Figure 2 and Figure 4 The first receiving surface 201 and the second receiving surface 501 share the same liquid collection container 420 to collect liquid. The liquid guide pipe 410 has a branch pipe 411, which connects to the second overflow port 502. This simplifies the liquid collection and liquid seal structure and reduces installation steps. Alternatively, the second overflow port 502 can extend into the liquid collection container 420 via a separate pipe fitting.

[0065] In one implementation, please refer to Figure 2 and Figure 4 The second filter element 500 is located below the support member 200, and the filter section 510 is higher than the first receiving surface 201. It is understood that the lowest side of the first filter element 300 will not be lower than the first receiving surface 201. After the gas-liquid mixture flows through the filter section 510, it enters the first filter element 300 from its lowest side. When the filter section 510 is higher than the first receiving surface 201, when the gas-liquid mixture flows along the aforementioned path, it needs to flow downwards first and then upwards through the first filter element 300 from the filter section 510 to its inlet side. This extends the flow distance from the filter section 510 to the inlet side of the first filter element 300, which is beneficial for the condensation of larger droplets in the gas-liquid mixture, allowing them to fall onto the second receiving surface 501. This reduces the filtration load on the first filter element 300 and the drainage load on the first outlet 202, thereby further improving the gas-liquid separation efficiency of the filtration equipment.

[0066] In one implementation, please refer to Figure 2 and Figure 4 The second filter element 500 is connected to the support member 200. Thus, the support member 200 provides support for the second filter element 500, ensuring its installation stability. The first filter element 300, the second filter element 500, and the liquid seal mechanism only need to be connected to the support member 200, and are ultimately fixed by the support member 200 and the housing 100. Of course, in other embodiments, the second filter element 500 can also be fixed to the housing 100.

[0067] Specifically, please refer to Figure 2 and Figure 4 The second filter element 500 is connected to the first mounting portion 210, and the filter portion 510 is disposed opposite to the connecting portion 230. In this way, the filter portion 510 can be disposed above the first receiving surface 201, and the second receiving surface 501 is located directly below the first receiving surface 201, which facilitates the arrangement of the liquid guide tube 410 and the liquid collection container 420.

[0068] Without loss of generality, the filter section 510 is configured as a sintered mesh assembly. This allows for the filtration of solid impurities through the sintered mesh assembly without affecting the passage of gas. It is understood that the sintered mesh assembly has an upstream side and a downstream side. The gas-liquid mixture flows from the upstream side of the sintered mesh assembly through it to the downstream side. Solid impurities are intercepted on the surface of the upstream side of the sintered mesh assembly. Therefore, the surface of the upstream side of the sintered mesh assembly can be made smooth, allowing solid impurities to easily detach and not accumulate on that side, thus not affecting the filtration effect of the sintered mesh assembly on solid impurities. This enables the sintered mesh assembly to reliably filter solid impurities over a long period.

[0069] In one implementation, please refer to Figure 2 and Figure 4 The second filter element 500 includes a first cylindrical portion 520 and a second cylindrical portion 530 arranged sequentially along the axial direction. The filter portion 510 is disposed between the first cylindrical portion 520 and the second cylindrical portion 530. The first cylindrical portion 520 is connected to the first filter element 300, and the second cylindrical portion 530 is connected to an end plate 540. The second receiving surface 501 is located on the end plate 540. In this way, the first cylindrical portion 520 and the second cylindrical portion 530 can be stably connected to their respective structures, while providing stable support for the filter portion 510 to ensure the structural stability of the filter portion 510. The various parts of the second filter element 500 can be separately formed and then connected by welding, or they can be integrally formed. In this case, the filter portion 510 also has a cylindrical structure. The gas-liquid mixture will flow from the outer peripheral side to the inner peripheral side of the filter portion 510. The outer peripheral side of the filter portion 510 is set as a smooth surface, so that solid impurities intercepted on this side can easily fall downwards.

[0070] This application also proposes a water electrolysis hydrogen production system, which includes a filtration device. The specific structure of the filtration device is as described in the above embodiments. Since this water electrolysis hydrogen production system 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.

[0071] The filtration equipment can process the gas-alkali mixture from the electrolytic cell outlet, separating the alkali and gas products. It can also process the gas-water mixture after water washing, separating the pure water. This reduces the liquid content in the gas products, ensuring their quality and facilitating subsequent purification. In the purification process, it avoids accelerating catalyst failure in the purification system and avoids increasing the operating load of the gas purification equipment.

[0072] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A filter device, characterized in that The application relates to a filter device. The filter device comprises: a housing (100) provided with a filter inlet (101) and an exhaust outlet (102); a support (200) arranged in the housing (100), wherein the filter inlet (101) is arranged below the support (200), the exhaust outlet (102) is arranged above the support (200), the upper side of the support (200) is provided with a first receiving surface (201) for receiving liquid, and the first receiving surface (201) is provided with a first flow-through opening (202); a first filter (300) arranged above the first receiving surface (201); and 2. The filter apparatus of claim 1, wherein, a liquid guide pipe (410) and a liquid collecting container (420) arranged below the support (200), wherein the upper end of the liquid guide pipe (410) is communicated with the first flow-through opening (202), and the lower end of the liquid guide pipe (410) is arranged below the opening of the liquid collecting container (420).

3. The filter apparatus of claim 2, wherein, The liquid collecting container (420) is connected with the liquid guide pipe (410).

4. The filter device according to any one of claims 1 to 3, characterized in that The lower end of the liquid guide pipe (410) and the liquid collecting container (420) are connected through a pin shaft (430).

5. The filter apparatus of claim 4, wherein, The filter device is further provided with a second filter (500), wherein the second filter (500) is arranged below the first filter (300), the second filter (500) is provided with a filter part (510), and the filter part (510) has at least a solid filtering function.

6. The filter apparatus of claim 5, wherein, The second filter (500) is provided with a second receiving surface (501) for receiving liquid, the second receiving surface (501) is arranged below the filter part (510) and is provided with a second flow-through opening (502), and the liquid guide pipe (410) is provided with a branch pipe part (411) communicated with the second flow-through opening (502). The second filter (500) comprises a first cylinder part (520) and a second cylinder part (530) arranged in sequence along an axial direction, the filter part (510) is arranged between the first cylinder part (520) and the second cylinder part (530), the first cylinder part (520) is connected with the first filter (300), the second cylinder part (530) is connected with an end plate (540), and the second receiving surface (501) is arranged on the end plate (540).

7. The filter apparatus of claim 4, wherein, The filter part (510) is arranged as a sintered mesh assembly. The second filter (500) is arranged below the support (200), and the filter part (510) is higher than the first receiving surface (201). The second filter (500) is connected with the support (200).

8. The filter apparatus of claim 7, wherein, The support (200) comprises a first mounting portion (210) and a second mounting portion (220), the outer periphery of the first mounting portion (210) is connected to the shell (100), the inner periphery of the first mounting portion (210) is connected to the outer periphery of the second mounting portion (220) through a connecting portion (230), the connecting portion (230) extends downward relative to the first mounting portion (210), the first receiving surface (201) is located at the second mounting portion (220), the second filter element (500) is connected to the first mounting portion (210), and the filter portion (510) is arranged relative to the connecting portion (230).

9. The filter apparatus of any one of claims 1 to 3, wherein, The support (200) is in a flat plate shape, and the outer periphery of the support (200) is connected to the shell (100); or the support (200) comprises a first mounting portion (210) and a second mounting portion (220), the outer periphery of the first mounting portion (210) is connected to the shell (100), the inner periphery of the first mounting portion (210) is connected to the outer periphery of the second mounting portion (220) through a connecting portion (230), the connecting portion (230) extends downward relative to the first mounting portion (210), and the first receiving surface (201) is located at the second mounting portion (220). And / or the first filter element (300) is configured as a coalescing filter element, an installation cylinder (310) is arranged at the end of the first filter element (300), the first receiving surface (201) is further provided with a third flow port (203), and the installation cylinder (310) is connected to the third flow port (203).

10. A hydrogen production system by water electrolysis, characterized by, The filter device comprises the filter device according to any one of claims 1 to 9.

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