Hydrogen sealing device for PEM electrolytic bath

Abstract

The utility model discloses a hydrogen sealing device for a PEM electrolytic bath, which is applied to the PEM electrolytic bath. One end of the air inlet pipe is communicated with the top end of the sealing tank, the other end of the air inlet pipe is communicated with the PEM electrolytic bath, and an air inlet valve is arranged on the air inlet pipe; one end of the exhaust pipe is communicated with the top end of the sealing tank, and an exhaust valve is arranged on the exhaust pipe; the sealing piston is movably embedded in the sealing tank, and a push rod penetrating through the bottom end of the sealing tank is arranged on the sealing piston; the device further comprises an active exhaust mechanism. A sealing piston is arranged in the sealing tank, the volume of an inner cavity of the sealing tank can be correspondingly adjusted according to the hydrogen amount, external air and hydrogen can be prevented from being mixed through cooperation of an air inlet valve and an exhaust valve, the hydrogen collection purity is high, and the sealing performance is good; the active exhaust mechanism drives the push rod to move, and hydrogen can be actively exhausted when the pressure of the hydrogen in the sealing tank is low, so that the hydrogen in the sealing tank can be completely exhausted.

Description

Technical Field

[0001] The utility model relates to the technical field of PEM water electrolysis, in particular to a hydrogen sealing device for a PEM electrolyzer. Background Art

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

[0003] In the prior art, a utility model patent with patent number CN218720590U discloses a hydrogen sealing device for a PEM water electrolyzer, comprising a PEM electrolyzer body and a hydrogen storage tank, wherein a sealing cover is arranged on the top of the hydrogen storage tank, an air inlet assembly and an exhaust assembly are arranged on the top surface of the sealing cover, and a hydrogen outlet is arranged on the top of the PEM electrolyzer body; the internal volume of the hydrogen storage tank in the sealing device is fixed, and the internal air cannot be completely discharged during the hydrogen storage process, which easily causes the hydrogen and air to be mixed together, thereby affecting the purity of the hydrogen; and during the hydrogen discharge process, when the hydrogen pressure in the hydrogen storage tank is lower than the external pressure, the hydrogen in the hydrogen storage tank cannot be completely discharged, thereby affecting the hydrogen discharge rate. Utility Model Content

[0004] The utility model aims to provide a hydrogen sealing device for a PEM electrolyzer to solve the problem that the internal volume of the hydrogen storage tank in the existing sealing device is fixed, which easily causes hydrogen and air to mix together, thereby affecting the purity of the hydrogen; and during the hydrogen discharge process, the hydrogen in the hydrogen storage tank cannot be completely discharged, thereby affecting the hydrogen discharge rate.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A hydrogen sealing device for a PEM electrolyzer, applied to the PEM electrolyzer, comprising:

[0007] Sealed cans;

[0008] An air inlet pipe, one end of which is connected to the top of the sealing tank, and the other end of which is connected to the PEM electrolyzer, and an air inlet valve is provided on the air inlet pipe;

[0009] an exhaust pipe, one end of which is connected to the top of the sealed tank, and an exhaust valve is provided on the exhaust pipe; and

[0010] The sealing piston is movably embedded in the sealing tank, and a push rod penetrating the bottom end of the sealing tank is arranged on the sealing piston.

[0011] As a further solution of the utility model: a plurality of through holes are provided at the bottom of the sealed tank.

[0012] As a further solution of the utility model: a plurality of groups of sealing rings are arranged on the circumferential surface of the sealing piston in contact with the sealing tank.

[0013] As a further solution of the utility model: a support guide rod is vertically arranged at the bottom of the sealed tank, and a base is arranged at one end of the support guide rod away from the sealed tank.

[0014] As a further solution of the utility model: it also includes an active exhaust mechanism, and the active exhaust mechanism includes:

[0015] A driving motor is mounted on the base;

[0016] A screw rod, one end of which is rotatably mounted on the bottom of the sealed tank, and the other end of which is connected to the output end of the driving motor;

[0017] The lifting plate is slidably sleeved on the supporting guide rod, and the lifting plate is threadedly connected to the lead screw.

[0018] As a further solution of the utility model: a telescopic plate is slidably arranged on the lifting plate, and a push handle is fixed on the telescopic plate.

[0019] Beneficial effects of the utility model:

[0020] A sealing piston is provided in the sealed tank, and the volume of the chamber in the sealed tank can be adjusted according to the amount of hydrogen. The coordination of the intake valve and the exhaust valve can prevent the external air from mixing with the hydrogen, and the hydrogen collected has high purity and good sealing performance.

[0021] By driving the push rod to move through the active exhaust mechanism, the hydrogen can be actively discharged when the hydrogen pressure in the sealed tank is low, so that the hydrogen in the sealed tank can be completely discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 The stereoscopic view of the utility model Figure 1 ;

[0024] Figure 2 The stereoscopic view of the utility model Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the internal structure of the sealed tank in the utility model;

[0026] Figure 4 It is a structural schematic diagram of the active exhaust mechanism in the utility model.

[0027] In the figure: 1. PEM electrolyzer; 2. Sealing tank; 3. Inlet pipe; 4. Exhaust pipe; 5. Inlet valve; 6. Exhaust valve; 7. Sealing piston; 8. Push rod; 9. Through hole; 10. Sealing ring; 11. Support guide rod; 12. Base; 13. Drive motor; 14. Screw; 15. Lifting plate; 16. Telescopic plate; 17. Push handle. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 and Figure 2 As shown, the utility model discloses a hydrogen sealing device for a PEM electrolyzer, which is used to collect hydrogen generated in a PEM electrolyzer 1, and may include a sealing tank 2, an air inlet pipe 3, an exhaust pipe 4 and a sealing piston 7, wherein one end of the air inlet pipe 3 is connected to the top of the sealing tank 2, and the other end is connected to the PEM electrolyzer 1, and an air inlet valve 5 is arranged on the air inlet pipe 3; one end of the exhaust pipe 4 is connected to the top of the sealing tank 2, and an exhaust valve 6 is arranged on the exhaust pipe 4; the sealing piston 7 is movably embedded in the sealing tank 2, and a push rod 8 penetrating the bottom end of the sealing tank 2 is arranged on the sealing piston 7;

[0030] Specifically, before the hydrogen is sealed and collected, the air inlet valve 5 is closed, the exhaust valve 6 is opened, and the sealing piston 7 is pushed to the top of the sealed tank 2, so that the air in the chamber between the top of the sealed tank 2 and the sealing piston 7 is completely discharged from the exhaust pipe 4; the air inlet valve 5 is opened again, the exhaust valve 6 is closed, and the PEM electrolyzer 1 starts to operate to produce hydrogen, and the hydrogen enters the sealed tank 2 through the air inlet pipe 3. As the amount of hydrogen in the sealed tank 2 increases, the sealing piston 7 is gradually pushed downward, so that the hydrogen is completely sealed in the chamber between the top of the sealed tank 2 and the sealing piston 7; when the hydrogen in the sealed tank 2 needs to be discharged, the air inlet valve 5 is closed again, and the exhaust valve 6 is opened. At this time, the hydrogen pressure in the sealed tank 2 is relatively large and can be discharged from the exhaust pipe 4 by itself. When the hydrogen pressure in the sealed tank 2 is equal to or less than the external pressure, the sealing piston 7 is pushed upward by the push rod 8, so that the hydrogen in the sealed tank 2 can be actively discharged.

[0031] Please note that Figure 3As shown, in the intake stage, in order to allow the hydrogen generated by the PEM electrolyzer 1 to be filled into the sealed tank 2 more smoothly, a plurality of through holes 9 are opened at the bottom of the sealed tank 2. During the hydrogen filling process, the air under the sealing piston 7 can be quickly discharged from the sealed tank 2 through the through holes 9, so that the sealing piston 7 can slide downward smoothly, thereby improving the hydrogen filling efficiency.

[0032] In addition, in order to avoid hydrogen leakage, multiple groups of sealing rings 10 are arranged on the circumferential surface where the sealing piston 7 contacts the sealing tank 2. The gap between the sealing piston 7 and the sealing tank 2 is sealed by the multiple groups of sealing rings 10, thereby improving the sealing performance of the chamber between the sealing piston 7 and the top of the sealing tank 2 and ensuring the sealed storage effect of hydrogen.

[0033] In one embodiment, it further comprises a support guide rod 11 and a base 12. The support guide rod 11 is vertically arranged at the bottom of the sealed tank 2, and the base 12 is arranged at one end of the support guide rod 11 away from the sealed tank 2.

[0034] For further information, see Figure 4 As shown, it also includes an active exhaust mechanism, which includes a driving motor 13, a screw rod 14 and a lifting plate 15, wherein the driving motor 13 is installed on the base 12, one end of the screw rod 14 is rotatably installed at the bottom of the sealed tank 2, and the other end is connected to the output end of the driving motor 13, and the lifting plate 15 is slidably sleeved on the support guide rod 11 and is threadedly connected to the screw rod 14; in the exhaust stage, when the hydrogen pressure in the sealed tank 2 is lower than the external pressure, the screw rod 14 is driven to rotate by the driving motor 13, thereby driving the lifting plate 15 to rise along the support guide rod 11, and the push rod 8 is pushed upward by the lifting plate 15, thereby pushing the sealing piston 7 to move upward, so that the hydrogen in the sealed tank 2 is actively discharged;

[0035] It should be noted that, during the intake phase or when active exhaust is not required, the lifting plate 15 needs to be lowered to the bottom of the support guide rod 11 to avoid affecting the normal lifting of the push rod 8, so as to ensure the normal filling and discharge of hydrogen;

[0036] It can be understood that for the convenience of operation, a telescopic plate 16 is slidably provided on the lifting plate 15, and a push handle 17 is fixed on the telescopic plate 16; when active exhaust is not required, the telescopic plate 16 is pushed back into the lifting plate 15 by the push handle 17, so that the lifting plate 15 and the push rod 8 do not interfere with each other in the vertical direction; when active exhaust is required, the telescopic plate 16 is pushed out horizontally so that the telescopic plate 16 is located directly below the push rod 8, and the telescopic plate 16 can be used to push the push rod 8 to move upward to achieve active exhaust.

[0037] In summary, the utility model discloses a hydrogen sealing device for a PEM electrolyzer. A sealing piston 7 is arranged in the sealing tank 2, and the volume of the chamber in the sealing tank 2 can be adjusted according to the amount of hydrogen. The cooperation of the intake valve 5 and the exhaust valve 6 can prevent the external air from mixing with the hydrogen, and the hydrogen collection purity is high and the sealing performance is good. The push rod 8 is driven to move by the active exhaust mechanism, and the hydrogen can be actively discharged when the hydrogen pressure in the sealing tank 2 is low, so that the hydrogen in the sealing tank 2 can be completely discharged.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A hydrogen sealing device for a PEM electrolyzer, applied to a PEM electrolyzer (1), characterized in that: include: Sealed can (2); An air intake pipe (3), one end of which is connected to the top of the sealed tank (2) and the other end of which is connected to the PEM electrolyzer (1); an air intake valve (5) is provided on the air intake pipe (3); an exhaust pipe (4), one end of which is connected to the top end of the sealed tank (2), and an exhaust valve (6) is provided on the exhaust pipe (4); and The sealing piston (7) is movably embedded in the sealing tank (2), and a push rod (8) penetrating the bottom end of the sealing tank (2) is arranged on the sealing piston (7).

2. A hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: The bottom of the sealed tank (2) is provided with a plurality of through holes (9).

3. A hydrogen sealing device for a PEM electrolyzer according to claim 2, characterized in that: A plurality of groups of sealing rings (10) are arranged on the circumferential surface of the sealing piston (7) in contact with the sealing tank (2).

4. A hydrogen sealing device for a PEM electrolyzer according to claim 1, characterized in that: A supporting guide rod (11) is vertically arranged at the bottom of the sealed tank (2), and a base (12) is arranged at one end of the supporting guide rod (11) away from the sealed tank (2).

5. A hydrogen sealing device for a PEM electrolyzer according to claim 4, characterized in that: Also included is an active exhaust mechanism, the active exhaust mechanism comprising: A driving motor (13) mounted on the base (12); A screw rod (14), one end of which is rotatably mounted on the bottom of the sealed tank (2), and the other end of which is connected to the output end of the driving motor (13); The lifting plate (15) is slidably sleeved on the supporting guide rod (11), and the lifting plate (15) is threadedly connected to the screw rod (14).

6. A hydrogen sealing device for a PEM electrolyzer according to claim 5, characterized in that: A telescopic plate (16) is slidably arranged on the lifting plate (15), and a push handle (17) is fixed on the telescopic plate (16).

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