Hydrogen seal for a pem electrolyser

Abstract

The utility model relates to the technical field of electrolytic bath hydrogen, and disclose hydrogen sealing device for PEM electrolytic tank, including seal jar, one end of seal jar is connected and is installed with sealing end cover, and the sealing end cover fixedly adheres the sealing plug piece in the inboard of seal jar on the side close to seal jar, the inboard of seal jar is connected with the sealing piston of coaxial heart sliding, the side of sealing piston away from sealing plug piece is connected and is installed with connecting piece, the outside shaft core department of connecting piece is equipped with the support ring of bushing, the inboard of connecting piece forms the inner chamber, in the use of hydrogen sealing device, the adaptive movement of sealing piston driven by gas filling, and the active movement of sealing piston auxiliary seal jar realizes the combination of gas thorough discharge, makes this hydrogen sealing device have the remarkable advantage in the hydrogen sealing treatment and storage process, and avoids the cumbersome operation and inconvenience of manual adjustment linkage structure, and only through the cooperation of one -way bearing and screw part can realize the autonomous switching of adaptive and active linkage demand.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen technology for electrolytic cells, and specifically relates to a hydrogen sealing device for PEM electrolytic cells. Background Technology

[0002] PEM (Polymer Electrolysis) for hydrogen production uses water as a raw material. When direct current passes through a PEM electrolyzer, an oxidation reaction occurs at the anode-solution interface, and a reduction reaction occurs at the cathode-solution interface to produce hydrogen and oxygen. During the PEM water electrolysis process, a sealed device is required to collect the hydrogen.

[0003] Currently, Chinese utility model patent CN 222437677 U discloses a hydrogen sealing device for a PEM electrolyzer. The device includes: a sealed tank; an inlet pipe, one end of which is connected to the top of the sealed tank and the other end to the PEM electrolyzer, with an inlet valve; an exhaust pipe, one end of which is connected to the top of the sealed tank, with an exhaust valve; a sealing piston, movably embedded within the sealed tank, with a push rod extending through the bottom of the sealed tank; and an active exhaust mechanism. The sealing piston within the sealed tank allows for adjustment of the internal chamber volume according to the amount of hydrogen. The cooperation of the inlet and exhaust valves prevents external air from mixing with hydrogen, resulting in high hydrogen purity and good sealing performance. The active exhaust mechanism drives the push rod to actively expel hydrogen when the hydrogen pressure inside the sealed tank is low, ensuring complete removal of hydrogen from the tank.

[0004] In the above-disclosed structure, when the gas inside the sealed container is discharged, if there is residual gas inside that cannot be fully discharged, the residual gas needs to be completely discharged through the coordinated operation of the drive motor, the lead screw and the sealing piston. During this process, if the sealed tank cannot completely discharge the gas, the drive motor needs to be started for each discharge operation. After the sealing piston completes the gas discharge requirement through the screw drive, the contact between the telescopic plate and the push rod needs to be manually released so that the sealing piston can move adaptively as the gas in the sealed tank gradually fills. This operation will cause the telescopic plate to be frequently adjusted during long-term use, which will cause inconvenience to the actual use of the hydrogen sealing device. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hydrogen sealing device for PEM electrolyzers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hydrogen sealing device for a PEM electrolyzer, comprising a sealing tank, a sealing end cap being snapped onto one end of the sealing tank, and a sealing plug located inside the sealing tank being fixedly adhered to the side of the sealing end cap near the sealing tank; a sealing piston being slidably connected coaxially to the inner side of the sealing tank; a connecting member being snapped onto the side of the sealing piston away from the sealing plug; and a supporting collar being sleeved at the outer axial center of the connecting member. The inner side of the connector has an inner cavity, and a drive screw is provided in the inner cavity. The surface of the drive screw is fitted with a threaded part with a threaded connection. A one-way bearing is fixed coaxially to the threaded part, and the one-way bearing and the connector are interlocked and installed.

[0007] Preferably, a symmetrically arranged connecting pipe is fixedly inserted into the side of the sealing end cap away from the sealing tank. One end of the connecting pipe passes through the sealing end cap and the sealing plug, and a one-way valve is installed on the connecting pipe.

[0008] Preferably, a viewing window is embedded in the surface of the sealed container, and a guide step surface and a decreasing step surface are formed on the inner side of the sealed container, with the guide step surface located at one end of the viewing window.

[0009] Preferably, the sealing piston has an inclined surface on the side away from the sealing plug, and the angle of the inclined surface matches that of the guide step surface.

[0010] Preferably, the outer side of the connector is fitted with symmetrically arranged snap-fit ​​components, and the inner side of the support collar is provided with a snap-fit ​​groove, and the snap-fit ​​groove and the snap-fit ​​components are used in a snap-fit ​​engagement.

[0011] Preferably, the outer side of the support collar is fitted with a snap-fit ​​mounting plate, and the inner side of the mounting plate is provided with circumferentially distributed airflow holes.

[0012] Preferably, a drive motor is provided at the end of the drive screw away from the sealing piston, and the output end of the drive motor is fixedly connected to the drive screw through a coupling.

[0013] Preferably, the end of the drive screw near the drive motor is coaxially rotatably fitted with a support member, and the support member is snap-fitted to the sealed tank, and the drive motor and the support member are snap-fitted to each other.

[0014] In summary, this utility model has the following beneficial effects: 1. During the process of filling the sealed container with hydrogen, initially, the sealing piston is positioned close to the sealing plug. As the gas fills, the sealing piston gradually moves inside the sealed container. Simultaneously, the connecting component drives the one-way bearing and threaded component. Driven by the threaded sleeve on the drive screw surface, and combined with the one-way rotation characteristic of the one-way bearing, the threaded component rotates within the one-way bearing while moving progressively, thus cooperating with the connecting component to meet the longitudinal movement requirements. This structural design allows the sealing piston to autonomously adapt and move as the gas gradually fills the sealed container, preventing the introduction of other air into the sealed container due to active piston movement. This structure effectively ensures the purity of the hydrogen inside the sealed container. 2. When it is necessary to completely vent hydrogen from the sealed container, the rotation direction of the drive screw is opposite to the direction of the independent rotation of the threaded component on the drive screw surface. Therefore, the threaded component cannot rotate independently due to the unidirectional rotational characteristic of the one-way bearing. At this time, the threaded component will drive the one-way bearing and achieve longitudinal movement under the angular limiting effect of the connecting piece. During this process, the sealing piston gradually approaches the sealing plug and, upon finally contacting the sealing plug, achieves complete venting of the gas inside the sealed container. This setting effectively ensures that the drive motor is activated only when hydrogen venting is required, and the drive motor can be remotely controlled according to existing technology, providing convenience for the use of this hydrogen sealing device. 3. In the use of the hydrogen sealing device, the adaptive movement of the sealing piston driven by gas filling, combined with the active movement of the sealing piston to assist the sealing tank in achieving complete gas discharge, gives the hydrogen sealing device significant advantages in hydrogen sealing treatment and storage. It also avoids the tedious and inconvenient operation of manually adjusting the linkage structure. The autonomous switching between adaptive and active linkage can be achieved simply by the cooperation of a one-way bearing and a threaded part. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional schematic diagram of the sealing container and sealing end cap of this utility model; Figure 3 This is an enlarged cross-sectional view of the connector of this utility model; Figure 4 This is an exploded and enlarged schematic diagram of the support collar and the connecting plate of this utility model; Figure 5 This is an enlarged exploded view of the drive screw and threaded components of this utility model.

[0016] Figure label: 100. Sealed container; 101. Guide step; 102. Decreasing step; 200. Sealing end cap; 201. Connecting pipe; 202. Check valve; 203. Sealing plug; 300. Viewable window; 400. Sealed piston; 401. Inclined surface; 500. Connector; 501. Support collar; 502. Snap-fit ​​connector; 503. Snap-fit ​​groove; 600. Inner cavity; 601. Drive screw; 700. Connecting plate; 701. Airflow hole; 800. Threaded parts; 801. One-way bearings; 900, drive motor; 901, support component. Detailed Implementation

[0017] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0018] The specific embodiments of this utility model are described below with reference to the accompanying drawings: Example

[0019] refer to Figures 1-5 A hydrogen sealing device for a PEM electrolyzer includes a sealing tank 100, a sealing end cap 200 is snapped onto one end of the sealing tank 100, and a sealing plug 203 located inside the sealing tank 100 is fixedly adhered to the side of the sealing end cap 200 near the sealing tank 100. A sealing piston 400 is slidably connected to the inner side of the sealing tank 100. A connector 500 is snapped onto the side of the sealing piston 400 away from the sealing plug 203. A support collar 501 is sleeved at the outer axis of the connector 500. The inner side of the connector 500 forms an inner cavity 600, and a drive screw 601 is provided in the inner cavity 600. A threaded part 800 with a threaded connection is sleeved on the surface of the drive screw 601. A one-way bearing 801 is fixed coaxially on the threaded part 800. The one-way bearing 801 and the connector 500 are interlocked and installed.

[0020] Specifically, in the use of the hydrogen sealing device, the adaptive movement of the sealing piston 400 driven by gas filling, combined with the active movement of the sealing piston 400 to assist the sealing tank 100 in achieving complete gas discharge, gives the hydrogen sealing device significant advantages in hydrogen sealing treatment and storage. It also avoids the tedious and inconvenient operation of manually adjusting the linkage structure. The autonomous switching between adaptive and active linkage requirements can be achieved simply by the cooperation of the one-way bearing 801 and the threaded part 800.

[0021] A symmetrically arranged connecting pipe 201 is fixedly inserted into the side of the sealing end cap 200 away from the sealing container 100. One end of the connecting pipe 201 passes through the sealing end cap 200 and the sealing plug 203, and a one-way valve 202 is installed on the connecting pipe 201. A viewing window 300 is embedded in the surface of the sealing container 100. A guide step surface 101 and a decreasing step surface 102 are formed on the inner side of the sealing container 100, and the guide step surface 101 is located at one end of the viewing window 300. An inclined surface 401 is formed on the side of the sealing piston 400 away from the sealing plug 203, and the angle of the inclined surface 401 matches that of the guide step surface 101.

[0022] Specifically, the two connecting pipes 201 will respectively cooperate with the inside of the sealed container 100 to form the inlet pipe and outlet pipe required for hydrogen storage. The one-way valve 202 allows the two connecting pipes 201 to achieve one-way gas flow, so as to ensure the normal operation of the hydrogen storage and discharge process inside the sealed container 100. The viewing window 300 facilitates the operator to observe the situation inside the sealed container 100. In addition, the inner side of the sealed container 100 is provided with a guide step surface 101. The sealing piston 400 can move adaptively as the gas inside the sealed container 100 is filled and discharged. When the inclined surface 401 of the sealing piston 400 contacts the guide step surface 101, the sealing piston 400 will reach its movement limit and can no longer move. At this time, it can be regarded that the hydrogen inside the sealed container 100 has been filled to its maximum capacity.

[0023] The outer side of the connector 500 is fitted with symmetrically arranged snap-fit ​​parts 502. The inner side of the support collar 501 is provided with a snap-fit ​​groove 503, and the snap-fit ​​groove 503 and the snap-fit ​​parts 502 are used in a snap-fit ​​engagement. The outer side of the support collar 501 is fitted with a snap-fit ​​mounting plate 700, and the inner side of the mounting plate 700 is provided with circumferentially distributed airflow holes 701.

[0024] Specifically, when the connector 500 moves relative to the support collar 501, its locking member 502 and locking groove 503 cooperate to guide the movement of both, ensuring that the connector 500 moves stably within a preset range and preventing displacement. The sleeve support plate 700 cooperates with the support collar 501 to provide support, and through the airflow hole 701, adapts to changes in the gas inside the sealed tank 100 when the sealing piston 400 moves, enabling gas flow and discharge.

[0025] A drive motor 900 is provided at the end of the drive screw 601 away from the sealing piston 400, and the output end of the drive motor 900 is fixedly connected to the drive screw 601 through a coupling. A support member 901 is coaxially mounted at the end of the drive screw 601 close to the drive motor 900, and the support member 901 is snap-fitted to the sealing tank 100. The drive motor 901 and the support member 901 are also snap-fitted to each other.

[0026] Specifically, during the operation of the drive motor 900, the drive screw 601 will be driven to rotate synchronously. The support member 901 will provide further support for the drive screw 601, and the drive screw 601 will rotate smoothly through the rotation sleeve connection.

[0027] The working principle of this utility model is as follows: When the hydrogen sealing device is used, the two connecting pipes 201 installed on its sealing end cap 200 will respectively cooperate with the inside of the sealing tank 100 to form the inlet pipe and outlet pipe required for hydrogen storage. The one-way valve 202 can enable the two connecting pipes 201 to achieve one-way gas flow, so as to ensure the normal operation of the hydrogen storage and emission process inside the sealing tank 100.

[0028] During the process of filling the sealed container 100 with hydrogen, initially, the sealing piston 400 is positioned close to the sealing plug. As the gas fills, the sealing piston 400 gradually moves inside the sealed container 100. Simultaneously, the connecting piece 500 moves synchronously inside the supporting ring 501. The snap-fit ​​piece 502 and snap-fit ​​groove 503 work together to guide the movement of the connecting piece 500 and the supporting ring 501, ensuring stable movement of the connecting piece 500 within a preset range. Simultaneously, the connecting piece 500 drives the one-way bearing 801 and the threaded piece 800. Under the action of the threaded sleeve on the surface of the drive screw 601, combined with the unidirectional rotational characteristic of the one-way bearing 801, the threaded piece 800 rotates inside the one-way bearing 801 while moving progressively, thus cooperating with the connecting piece 500 to meet the longitudinal movement requirements.

[0029] When it is necessary to completely vent the hydrogen gas in the sealed container 100, the operator starts the drive motor 900, causing the drive screw 601 to rotate synchronously. The rotation of the drive screw 601 drives the threaded component 800. However, the direction of rotation of the drive screw 601 is opposite to the direction of the threaded component 800's independent rotation on the surface of the drive screw 601. Therefore, the threaded component 800 cannot rotate independently due to the unidirectional rotation characteristic of the one-way bearing 801. At this time, the threaded component 800 drives the one-way bearing 801 and moves longitudinally under the angular limiting effect of the connecting member 500. During this process, the sealing piston 400 gradually approaches the sealing plug 203, and upon final contact with the sealing plug 203, the gas inside the sealed container 100 is completely vented.

[0030] This structure allows the sealing piston 400 to move adaptively as it fills with gas, and for the sealing piston 400 to move actively to help the sealing tank 100 completely discharge the gas. The adaptive and autonomous linkage can be switched by only the cooperation of the one-way bearing 801 and the threaded part 800.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hydrogen sealing device for a PEM electrolyzer, comprising a sealing tank (100), wherein a sealing end cap (200) is snap-fitted onto one end of the sealing tank (100), and a sealing plug (203) located inside the sealing tank (100) is fixedly adhered to the side of the sealing end cap (200) near the sealing tank (100), characterized in that: A sealing piston (400) is slidably connected to the inner side of the sealed container (100) on the same axis. A connector (500) is snapped onto the side of the sealing piston (400) away from the sealing plug (203). A support collar (501) is sleeved on the outer axis of the connector (500). The inner side of the connector (500) forms an inner cavity (600), and a drive screw (601) is provided in the inner cavity (600). The surface of the drive screw (601) is fitted with a threaded part (800) for threaded connection. A one-way bearing (801) is fixed coaxially to the threaded part (800). The one-way bearing (801) and the connector (500) are interlocked and installed.

2. The hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: The sealing end cap (200) is fixedly connected to a symmetrically arranged connecting pipe (201) on the side away from the sealing tank (100). One end of the connecting pipe (201) passes through the sealing end cap (200) and the sealing plug (203), and a one-way valve (202) is installed on the connecting pipe (201).

3. The hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: A viewing window (300) is embedded in the surface of the sealed container (100). A guide step surface (101) and a decreasing step surface (102) are formed on the inner side of the sealed container (100), and the guide step surface (101) is located at one end of the viewing window (300).

4. The hydrogen sealing device for a PEM electrolyzer according to claim 3, characterized in that: The sealing piston (400) has an inclined surface (401) on the side away from the sealing plug (203), and the angle of the inclined surface (401) matches that of the guide step surface (101).

5. The hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: The outer side of the connector (500) is fitted with symmetrically arranged snap-fit ​​parts (502), and the inner side of the support collar (501) is provided with snap-fit ​​grooves (503), and the snap-fit ​​grooves (503) and snap-fit ​​parts (502) are used in a snap-fit ​​engagement.

6. The hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: The outer side of the support collar (501) is fitted with a snap-fit ​​sleeve plate (700), and the inner side of the sleeve plate (700) is provided with airflow holes (701) distributed in a circular pattern.

7. The hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: The drive screw (601) is provided with a drive motor (900) at the end away from the sealing piston (400), and the output end of the drive motor (900) is fixedly connected to the drive screw (601) through a coupling.

8. The hydrogen sealing device for a PEM electrolyzer according to claim 7, characterized in that: The drive screw (601) is coaxially rotatably fitted with a support (901) at one end near the drive motor (900), and the support (901) is snap-fitted to the sealed container (100). The drive motor (900) and the support (901) are also snap-fitted to each other.

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