CN217499434U - Water electrolytic tank with long service life and short assembly period - Google Patents

Abstract

The utility model relates to a water electrolysis trough that life and assembly cycle are short relates to electrolysis trough technical field, including two planks, water conservancy diversion mechanism and at least two sets of PTFE gaskets, the centre of two planks is all arranged in to water conservancy diversion mechanism and at least two sets of PTFE gaskets, and the quantity of every group PTFE gasket is provided with the membrane electrode for the centre of two and two PTFE gaskets, and what correspond on every PTFE gasket runs through there is a fluting, and corresponds on every grooved inner wall installs a foam titanium board, and the water conservancy diversion mechanism includes: a first bipolar plate, a plurality of second bipolar plates, and a third bipolar plate. The utility model discloses the utilization is seted up the water conservancy diversion group on graphite, metallization graphite or metal, is difficult for letting the cell body sink, has improved the holistic heat dispersion of electrolysis trough, and directly uses the mode that the planking connects the electricity, lets the current collector need not purchase and equipment, saves the cost, reduces the equipment cycle to, a large amount of sealing washer and the circle groove of setting up make the leakproofness better.

Description

Water electrolysis tank with long service life and short assembly period

Technical Field

The utility model relates to the technical field of electrolytic cells, in particular to a water electrolytic cell with long service life and short assembly period.

Background

The electrolytic cell is composed of a cell body, an anode and a cathode, and an anode chamber and a cathode chamber are mostly separated by an interlayer, wherein the electrolytic cell is divided into an aqueous solution electrolytic cell, a molten salt electrolytic cell and a non-aqueous solution electrolytic cell according to the difference of electrolytes.

Wherein, the water solution electrolytic cell directly utilizes water to produce hydrogen, and the production mode is as follows: when direct current passes through the electrolytic cell, oxidation reaction occurs at the interface of the anode and the aqueous solution, and reduction reaction occurs at the interface of the cathode and the aqueous solution, so as to prepare the required hydrogen, and the optimization design of the electrolytic cell structure is carried out, and the reasonable selection of the electrode and the interlayer material is the key for reducing the production cost and improving the production efficiency.

At present, the water electrolysis tank on the market usually adopts the mode of slotting on the PTFE gasket to carry out the water conservancy diversion, let the PTFE gasket accomplish the pressfitting with the membrane electrode after the pressurized, in order to strive for inside better chemical reaction degree and the leakproofness of electrolysis tank, but this kind of mode heat dispersion is relatively poor, in long-term use, cause the guiding gutter to collapse easily, the life-span is short, and current collector plate has still been added in the electrolysis tank of current, introduce the direct current through current collector plate and react, make the assembly cycle lengthen, that is, short-term and long period will decline the market competitiveness of product, be unfavorable for the enterprise's profit, therefore need to design a water electrolysis tank of high life and short assembly cycle to solve above-mentioned problem urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a water electrolysis trough that high life and equipment cycle are short to solve the grooved mode on the PTFE gasket that proposes in the above-mentioned background art, heat dispersion is relatively poor, causes the guiding gutter to sink easily, and the life-span is short, and has still added the current collector plate in the current electrolysis trough, makes the defect that the equipment cycle is elongated.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a water electrolysis trough that high life and equipment cycle are short, includes two planks, water conservancy diversion mechanism and at least two sets of PTFE gaskets, the centre of two planks is all arranged in to water conservancy diversion mechanism and at least two sets of PTFE gaskets, and the quantity of every group PTFE gasket is two and the centre of two PTFE gaskets is provided with the membrane electrode, and what correspond on every PTFE gasket runs through there is a fluting, and corresponds on every grooved inner wall installs a titanium foam board, wherein, water conservancy diversion mechanism includes: the bipolar plate comprises a first bipolar plate, a plurality of second bipolar plates and a third bipolar plate, wherein a first flow guide group is arranged on one surface of the first bipolar plate close to the third bipolar plate, a second flow guide group and a third flow guide group are correspondingly arranged on each second bipolar plate, the third flow guide group is arranged on a back separation surface of the surface where the second flow guide group is arranged and close to the third bipolar plate, and a fourth flow guide group is arranged on one surface of the third bipolar plate close to the first bipolar plate.

Preferably, a plurality of second bipolar plates are positioned between the first bipolar plate and the third bipolar plate, and the first bipolar plate, the second bipolar plate and the third bipolar plate are all provided with communication holes in a penetrating manner, and the number of the communication holes is two, three or one; the first flow guide group is communicated with two communicating holes on the first bipolar plate, one of the communicating holes on the second bipolar plate is communicated with the second flow guide group, the other two communicating holes are communicated with the third flow guide group, and the fourth flow guide group is communicated with one communicating hole on the third bipolar plate.

Preferably, the first flow guide group, the second flow guide group, the third flow guide group and the fourth flow guide group respectively comprise an outer frame flow channel, a plurality of grooves and a plurality of ridge channels, the width of each groove is 0.5-3 mm, and the ratio of the width of each groove to the width of each ridge channel is 0.3-0.7.

Preferably, the first bipolar plate, the second bipolar plate and the third bipolar plate are made of metal-plated graphite, pure graphite or metal, and the metal comprises copper, silver, nickel or titanium.

Preferably, a sealing mechanism is arranged on the flow guide mechanism, the sealing mechanism includes a first sealing group, a second sealing group, a third sealing group, a fourth sealing group, a fifth sealing group and a sixth sealing group, the first sealing group and the sixth sealing group are respectively arranged on the first bipolar plate and the third bipolar plate, the first sealing group includes two first ring grooves and two first sealing rings, the sixth sealing group includes one sixth ring groove and one sixth sealing ring, the first ring groove and the sixth ring groove surround the outer sides of the corresponding communication holes, the first sealing ring abuts against the inner wall of the first ring groove, and the sixth sealing ring abuts against the inner wall of the sixth ring groove.

Preferably, the second sealing group and the fourth sealing group are respectively disposed on the first bipolar plate and the second bipolar plate, the second sealing group includes a second ring groove and a second sealing ring, the fourth sealing group includes a fourth ring groove and a fourth sealing ring, the second ring groove surrounds the first flow guide group and the outer side of the corresponding communication hole, the fourth ring groove surrounds the third flow guide group and the outer side of the corresponding communication hole, the second sealing ring abuts against the inner wall of the second ring groove, and the fourth sealing ring abuts against the inner wall of the fourth ring groove.

Preferably, the third seal group and the fifth seal group are respectively disposed on the second bipolar plate and the third bipolar plate, the third seal group includes a third groove and a third seal ring, the fifth seal group includes a fifth groove and a fifth seal ring, the third groove surrounds the second flow guide group and the outer side of the corresponding communication hole, the fifth groove surrounds the fourth flow guide group and the outer side of the corresponding communication hole, the third seal ring abuts against the inner wall of the third groove, and the fifth seal ring abuts against the inner wall of the fifth groove.

Preferably, each outer plate is correspondingly provided with a power-on hole, the power-on hole is externally connected with an electric wire, and the electric wire is communicated with a power supply.

Preferably, two openings penetrate through one of the outer plates, a hydrogen outlet hole penetrates through the other outer plate, a hydrogen outlet pipe is installed on the hydrogen outlet hole, an oxygen outlet pipe is installed on one opening, a water outlet pipe is installed on the other opening, and the hydrogen outlet pipe, the oxygen outlet pipe and the water outlet pipe are arranged on two sides of the two outer plates, which are far away from each other.

Preferably, two planks first bipolar plate the second bipolar plate the third bipolar plate with all run through on the PTFE gasket and have a plurality of screws, and the threaded connection that corresponds on the inner wall of every screw has a screw, and the threaded connection that every screw corresponds has a nut, and the corresponding cup joint of every screw has two at least ring pieces, and wherein two ring pieces offset in the both sides that two planks kept away from each other, and every ring piece is kept away from one side of planking offsets and has an insulating piece.

Compared with the prior art, the beneficial effects of the utility model are that: this water electrolyser utilizes to set up the guiding gutter on graphite, metal-plated graphite or metal, has replaced the guiding gutter of seting up originally on the PTFE gasket, has improved the holistic heat dispersion of electrolysis trough, also can not be in long-term use, cause the subsidence of cell body, and cancelled the current collector, the mode that directly uses the planking to connect the electricity, let the current collector need not purchase and equipment, saved manufacturing cost, the equipment cycle has been reduced, and, a large amount of sealing washer and the ring groove of setting up in the sealing mechanism, reduce the rate of revealing, make the leakproofness better.

Firstly, set up water conservancy diversion mechanism on graphite, metal plating graphite or metal through the setting, avoided setting up water conservancy diversion mechanism on the PTFE gasket, the high heat dispersion of performance graphite, metal plating graphite or metal reduces the inside heat when the electrolysis trough moves to, graphite, metal plating graphite or metal material's stability is higher, and the width of recess is convenient for adjust, is difficult for making the fluting collapse in long-term use in the time of easy customization, has improved the life of this device.

Secondly, through the arrangement of the sealing mechanism, when the electrochemical reaction occurs in the electrolytic cell, water, oxygen or hydrogen cannot leak out from the gap, so that sufficient hydrogen with the purity of 99.999 percent is generated and discharged by the hydrogen outlet pipe and collected.

Thirdly, through set up the circular telegram hole on the planking, cancelled the setting of collector plate, reduced the purchase and the equipment of collector plate, reduced manufacturing cost and equipment cycle, improved the market competitiveness of this electrolysis trough, in addition, added the insulating piece again and carried out insulation treatment, avoided the planking electric leakage after the circular telegram, caused other unexpected circumstances.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic diagram of the explosion structure of the present invention;

FIG. 3 is a schematic view of the PTFE gasket of FIG. 2 according to the present invention;

fig. 4 is a schematic structural view of the first bipolar plate of fig. 2 according to the present invention;

FIG. 5 is a schematic view of the titanium foam board shown in FIG. 3 according to the present invention;

fig. 6 is a schematic structural view of the sealing mechanism of fig. 2 according to the present invention;

fig. 7 is a rear view of the structure of fig. 6 according to the present invention.

In the figure: 1. an outer plate; 2. a flow guide mechanism; 21. a first bipolar plate; 22. a second bipolar plate; 23. a third bipolar plate; 24. a communicating hole; 25. a first flow directing group; 26. a second flow guide group; 27. a third flow guide group; 28. a fourth flow guide group; 29. an outer frame runner; 210. a groove; 211. a spinal canal; 3. a PTFE gasket; 4. a membrane electrode; 5. a foamed titanium plate; 6. a power-on hole; 7. a sealing mechanism; 71. a first seal group; 711. a first ring groove; 712. a first seal ring; 72. a second seal group; 721. a second ring groove; 722. a second seal ring; 73. a third seal group; 731. a third ring groove; 732. a third seal ring; 74. a fourth seal group; 741. a fourth ring groove; 742. a fourth seal ring; 75. a fifth seal group; 751. a fifth ring of grooves; 752. a fifth seal ring; 76. a sixth seal group; 761. a sixth ring of grooves; 762. a sixth seal ring; 8. a hydrogen outlet pipe; 9. an oxygen outlet pipe; 10. a water outlet pipe; 11. a screw hole; 12. a screw; 13. a nut; 14. a ring sheet; 15. an insulating sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides an embodiment: the utility model provides a water electrolysis trough that high life and assembly cycle are short, including two planking 1, water conservancy diversion mechanism 2 and at least two sets of PTFE gasket 3 all arrange the centre of two planking 1 in, the quantity of every group PTFE gasket 3 is two and the centre of two PTFE gaskets 3 is provided with membrane electrode 4, its membrane electrode 4 includes, the corresponding penetration that goes up every PTFE gasket 3 has a fluting, and the corresponding titanium foam plate 5 of installing on every slotted inner wall, titanium foam plate 5 is that titanium powder passes through the sintering filtration back, carry out static pressure, the mould pressing, extrusion, a micropore metal filter material of formation, wherein, water conservancy diversion mechanism 2 includes: the electrolytic cell comprises a first bipolar plate 21, a plurality of second bipolar plates 22 and a third bipolar plate 23, wherein a first flow guide group 25 is arranged on one surface of the first bipolar plate 21 close to the third bipolar plate 23, each second bipolar plate 22 is correspondingly provided with a second flow guide group 26 and a third flow guide group 27, the third flow guide group 27 is arranged on a back-off surface of the surface where the second flow guide group 26 is arranged and close to the third bipolar plate 23, and a fourth flow guide group 28 is arranged on one surface of the third bipolar plate 23 close to the first bipolar plate 21.

Further, a plurality of second bipolar plates 22 are positioned between the first bipolar plate 21 and the third bipolar plate 23, the number of the second bipolar plates 22 may be one or more, and under different hydrogen production requirements, a required number of the second bipolar plates 22 can be placed, so as to facilitate customization of customers, the first bipolar plate 21, the second bipolar plate 22 and the third bipolar plate 23 are all provided with communication holes 24, and the number is two, three and one in sequence; the first flow guide set 25 is communicated with two communication holes 24 on the first bipolar plate 21, one communication hole 24 on the second bipolar plate 22 is communicated with the second flow guide set 26, the other two communication holes 24 are communicated with the third flow guide set 27, the fourth flow guide set 28 is communicated with one communication hole 24 on the third bipolar plate 23, and after the communication holes 24 are communicated with the flow guide sets, water, oxygen and hydrogen can be well separated, hydrogen and oxygen can be discharged through proper outlets, and part of water after reaction can be recovered.

Further, the first flow guide group 25, the second flow guide group 26, the third flow guide group 27 and the fourth flow guide group 28 each include an outer frame flow channel 29, a plurality of grooves 210 and a plurality of ridge channels 211, the width of the groove 210 is 0.5mm to 3mm, the ratio of the width of the groove 210 to the width of the ridge channel 211 is 0.3 to 0.7, when the reaction flow on a single membrane electrode 4 in the electrolytic cell needs to be increased or decreased, the adjustment can be performed by increasing or decreasing the width of the groove 210, and when the width of the groove 210 is adjusted, the width ratio of the ridge channel 211 to the groove 210 is maintained, so that the customization of the electrolytic cell required by a customer is realized, and the customized electrolytic cell is suitable for different requirements.

Furthermore, the first bipolar plate 21, the second bipolar plate 22 and the third bipolar plate 23 are made of metal-plated graphite, pure graphite or metal, the metal comprises copper, silver, nickel or titanium, the heat dissipation performance and the stability after slotting of the materials are better than those of the PTFE gasket 3, the heat generation of the electrolytic cell can be reduced under the same power, and the operation state is better.

Further, the flow guiding mechanism 2 is provided with a sealing mechanism 7, the sealing mechanism 7 includes a first sealing group 71, a second sealing group 72, a third sealing group 73, a fourth sealing group 74, a fifth sealing group 75 and a sixth sealing group 76, the first sealing group 71 and the sixth sealing group 76 are respectively disposed on the first bipolar plate 21 and the third bipolar plate 23, the first sealing group 71 includes two first ring grooves 711 and two first sealing rings 712, the sixth sealing group 76 includes one sixth ring groove 761 and one sixth sealing ring 762, the first ring groove 711 and the sixth ring groove 761 are surrounded outside the corresponding communication hole 24, the first sealing ring 712 abuts against an inner wall of the first ring groove 711, and the sixth sealing ring 762 abuts against an inner wall of the sixth ring groove 761.

It should be noted that the first seal group 71 and the sixth seal group 76 act on the outer sides of the first bipolar plate 21 and the third bipolar plate 23, so that water, oxygen, or hydrogen does not leak out from the communication holes 24 of the first bipolar plate 21 and the third bipolar plate 23.

Further, the second seal group 72 and the fourth seal group 74 are respectively disposed on the first bipolar plate 21 and the second bipolar plate 22, the second seal group 72 includes a second groove 721 and a second seal ring 722, the fourth seal group 74 includes a fourth groove 741 and a fourth seal ring 742, the second groove 721 surrounds the first flow guide group 25 and the corresponding communication hole 24, the fourth groove 741 surrounds the third flow guide group 27 and the corresponding communication hole 24, the second seal ring 722 abuts against an inner wall of the second groove 721, and the fourth seal ring 742 abuts against an inner wall of the fourth groove 741.

Further, a third sealing group 73 and a fifth sealing group 75 are respectively disposed on the second bipolar plate 22 and the third bipolar plate 23, the third sealing group 73 includes a third groove 731 and a third sealing ring 732, the fifth sealing group 75 includes a fifth groove 751 and a fifth sealing ring 752, the third groove 731 surrounds the outside of the second flow guiding group 26 and the corresponding communication hole 24, the fifth groove 751 surrounds the outside of the fourth flow guiding group 28 and the corresponding communication hole 24, the third sealing ring 732 abuts against the inner wall of the third groove 731, and the fifth sealing ring 752 abuts against the inner wall of the fifth groove 751.

It should be noted that the second seal pack 72 and the fifth seal pack 75 act on the inner side of the first bipolar plate 21 and the third bipolar plate 23 to prevent water, oxygen and hydrogen from leaking out of the first flow guide pack 25 or the fourth flow guide pack 28.

It should be noted that the third sealing group 73 and the fourth sealing group 74 act on both sides of the second bipolar plate 22, so as to prevent water, oxygen and hydrogen from leaking out of the second flow guiding group 26 or the third flow guiding group 27.

Furthermore, each outer plate 1 is correspondingly provided with a power-on hole 6, the power-on holes 6 are externally connected with wires, and the wires are communicated with a power supply.

It should be noted that, the arrangement of the current collecting plate is cancelled, the arrangement of the external power is concentrated on the outer plate 1, the purchase of the raw materials of the current collecting plate is reduced, one link for assembling the current collecting plate is omitted, and the assembly period is shortened.

Further, two openings penetrate through one of the outer plates 1, one hydrogen outlet hole penetrates through the other outer plate 1, the hydrogen outlet pipe 8 is installed on the hydrogen outlet hole, the oxygen outlet pipe 9 is installed on one opening, the water outlet pipe 10 is installed on the other opening, and the hydrogen outlet pipe 8, the oxygen outlet pipe 9 and the water outlet pipe 10 are arranged on two sides of the two outer plates 1, which are far away from each other.

Further, a plurality of screw holes 11 are formed in the two outer plates 1, the first bipolar plate 21, the second bipolar plate 22, the third bipolar plate 23 and the PTFE gasket 3 in a penetrating mode, a screw 12 is connected to the inner wall of each screw hole 11 in a corresponding threaded mode, a nut 13 is connected to the screw 12 in a corresponding threaded mode, at least two ring pieces 14 are correspondingly sleeved on each screw 12, two ring pieces 14 abut against two sides of the two outer plates 1, the insulating piece 15 abuts against one side, far away from the outer plates 1, of each ring piece 14, the insulating piece 15 prevents electricity on the outer plates 1 from leaking out after the outer plates 1 are electrified, and workers are injured.

In some embodiments, a power supply is connected with an electric wire, the electric wire is connected with the through holes 6 on the two outer plates 1, a power supply is started, water is introduced from the water outlet pipe 10, enters the first flow guide group 25 through the through hole 24 on one of the outer plates 1 and the through hole 24 on the first bipolar plate 21, permeates the titanium foam plate 5 when passing through the first flow guide group 25, and reacts electrochemically with the membrane electrode 4 in the middle of the first group of PTFE gaskets 3, oxygen is generated on one side of the membrane electrode 4, hydrogen is generated on the other side, then the oxygen and the water left after the reaction flow into the oxygen outlet pipe 9 or the water outlet pipe 10 along the first flow guide group 25, and the hydrogen generated on the other side flows into the hydrogen outlet pipe 8 along the second flow guide group 26 through the through hole 24 on the second bipolar plate 22 to collect the hydrogen, but in the process, part of the water enters the side of the second bipolar plate 22 far away from the first bipolar plate 21 along the other through hole 24 on the second bipolar plate 22, at this time, water flows through the third flow guide set 27 and permeates the other titanium foam plate 5 when passing through the third flow guide set 27, and reacts electrochemically with the membrane electrode 4 in the middle of the second set of PTFE gasket 3, generating oxygen on one side of the membrane electrode 4 and hydrogen on the other side, and then the oxygen and the water left after the reaction flow along the third flow guide set 27 or into the oxygen outlet pipe 9 or into the water outlet pipe 10, while the hydrogen generated on the other side flows along the fourth flow guide set 28 through the communication hole 24 on the third bipolar plate 23 into the hydrogen outlet pipe 8 to collect the hydrogen.

In some embodiments, the membrane electrode 4 is connected in series in the electrolytic cell, after the water is introduced into the electrolytic cell through the water outlet pipe 10, a part of the water will undergo an electrochemical reaction through the membrane electrode 4 between the first bipolar plate 21 and the second bipolar plate 22, a part of the water will undergo an electrochemical reaction through the membrane electrode 4 between the second bipolar plate 22 and the third bipolar plate 23, and after the reaction, the concentrated hydrogen gas obtained is discharged from the hydrogen outlet pipe 8 communicated with the third bipolar plate 23 for collection and use.

In some embodiments, a plurality of second bipolar plates 22 may be arranged such that the series connection of the electrolyzer is increased, i.e., a portion of the water electrochemically reacts with the first membrane electrode 4 along the first flow guide set 25 on the first bipolar plate 21, a portion of the water electrochemically reacts with the second membrane electrode 4 along the flow guide set on the first second bipolar plate 22 near the third bipolar plate 23, a portion of the water electrochemically reacts with the third membrane electrode 4 along the flow guide set on the second bipolar plate 22 near the third bipolar plate 23, and so on, a plurality of second bipolar plates 22 may be inserted and multiple electrochemical reactions may occur simultaneously to produce hydrogen, and the more series connections, the more hydrogen is produced and at a faster rate.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A water electrolyser with long life and short assembly cycle, comprising:

two planking (1), water conservancy diversion mechanism (2) and at least two sets of PTFE gasket (3), the centre of two planking (1) is all arranged in to water conservancy diversion mechanism (2) and at least two sets of PTFE gasket (3), and the quantity of every group PTFE gasket (3) is provided with membrane electrode (4) for the centre of two and two PTFE gaskets (3), and the corresponding penetration has a fluting on every PTFE gasket (3), and corresponds on every fluting inner wall and install a titanium foam board (5), wherein, water conservancy diversion mechanism (2) includes:

the bipolar plate structure comprises a first bipolar plate (21), a plurality of second bipolar plates (22) and a third bipolar plate (23), wherein a first flow guide group (25) is arranged on one surface, close to the third bipolar plate (23), of the first bipolar plate (21), a second flow guide group (26) and a third flow guide group (27) are correspondingly arranged on each second bipolar plate (22), the third flow guide group (27) is arranged on a back separation surface, where the second flow guide group (26) is located, and close to the third bipolar plate (23), and a fourth flow guide group (28) is arranged on one surface, close to the first bipolar plate (21), of the third bipolar plate (23).

2. The long-life and short-cycle water electrolyser as claimed in claim 1, characterized in that several second bipolar plates (22) are positioned in the middle of said first bipolar plate (21) and said third bipolar plate (23), said first bipolar plate (21), said second bipolar plate (22) and said third bipolar plate (23) having communication holes (24) passing through them, in number of two, three and one in sequence;

the first flow guide group (25) is communicated with two communicating holes (24) on the first bipolar plate (21), one communicating hole (24) on the second bipolar plate (22) is communicated with the second flow guide group (26), the other two communicating holes (24) are communicated with the third flow guide group (27), and the fourth flow guide group (28) is communicated with one communicating hole (24) on the third bipolar plate (23).

3. The water electrolyzer having a long service life and a short assembly cycle as claimed in claim 2, characterized in that the first flow guide group (25), the second flow guide group (26), the third flow guide group (27) and the fourth flow guide group (28) each comprise an outer frame flow channel (29), a plurality of grooves (210) and a plurality of ridges (211), the width of each groove (210) is 0.5mm to 3mm, and the ratio of the width of each groove (210) to the width of each ridge (211) is 0.3 to 0.7.

4. A long-life and short-cycle water electrolyser as claimed in claim 2, characterized in that said first bipolar plate (21), said second bipolar plate (22) and said third bipolar plate (23) are made of metallized graphite, pure graphite or metal, the metal in turn comprising copper, silver, nickel or titanium.

5. The long-life and short-assembly-cycle water electrolyser in accordance with claim 2, characterized in that a sealing mechanism (7) is provided on said flow-guiding mechanism (2), said sealing mechanism (7) comprising a first sealing group (71), a second sealing group (72), a third sealing group (73), a fourth sealing group (74), a fifth sealing group (75) and a sixth sealing group (76), said first sealing group (71) and said sixth sealing group (76) being provided on said first bipolar plate (21) and said third bipolar plate (23), respectively, said first sealing group (71) comprising two first rings (711) and two first sealing rings (712), said sixth sealing group (76) comprising one sixth ring (761) and one sixth sealing ring (762), said first ring (711) and said sixth ring (761) surrounding the outside of the corresponding communication holes (24), the first sealing ring (712) abuts against the inner wall of the first ring groove (711), and the sixth sealing ring (762) abuts against the inner wall of the sixth ring groove (761).

6. A long-life, short-cycle water electrolyser as claimed in claim 5, the second and fourth sealing groups (72, 74) being respectively provided on the first and second bipolar plates (21, 22), the second sealing group (72) comprises a second ring groove (721) and a second sealing ring (722), said fourth sealing group (74) comprising a fourth groove (741) and a fourth sealing ring (742), the second ring groove (721) surrounds the first guide flow group (25) and the corresponding communication hole (24), the fourth ring groove (741) surrounds the third guide flow group (27) and the corresponding communication hole (24), the second sealing ring (722) is pressed against the inner wall of the second ring groove (721), the fourth sealing ring (742) abuts against the inner wall of the fourth ring groove (741).

7. A long-life, short-cycle water electrolyser as claimed in claim 5, the third and fifth sealing groups (73, 75) being respectively arranged on the second and third bipolar plates (22, 23), said third sealing group (73) comprising a third groove (731) and a third sealing ring (732), said fifth sealing group (75) comprising a fifth sealing ring (752) and a fifth groove (751), the third ring groove (731) surrounds the outer sides of the second flow guide group (26) and the corresponding communication hole (24), the fifth ring groove (751) surrounds the outer side of the fourth guide flow group (28) and the corresponding communication hole (24), the third sealing ring (732) is pressed against the inner wall of the third ring groove (731), the fifth sealing ring (752) abuts against the inner wall of the fifth ring groove (751).

8. The water electrolyzer with long service life and short assembly cycle as claimed in claim 1, characterized in that each outer plate (1) is correspondingly provided with a current-carrying hole (6), and the current-carrying holes (6) are externally connected with wires which are communicated with a power supply.

9. The long-life and short-cycle water electrolyser as claimed in claim 8, wherein one of the external plates (1) has two openings therethrough, the other external plate (1) has a hydrogen outlet, and the hydrogen outlet is provided with a hydrogen outlet pipe (8), wherein one of the openings is provided with an oxygen outlet pipe (9), the other opening is provided with a water outlet pipe (10), and the hydrogen outlet pipe (8), the oxygen outlet pipe (9) and the water outlet pipe (10) are disposed on two sides of the two external plates (1) which are far away from each other.

10. The long-life and short-cycle water electrolyser as claimed in claim 6, characterized in that a plurality of screw holes (11) are formed through the two outer plates (1), the first bipolar plate (21), the second bipolar plate (22), the third bipolar plate (23) and the PTFE gasket (3), a screw (12) is correspondingly screwed on the inner wall of each screw hole (11), a nut (13) is correspondingly screwed on each screw (12), at least two ring plates (14) are correspondingly sleeved on each screw (12), wherein the two ring plates (14) abut against the two sides of the two outer plates (1) far away from each other, and an insulating plate (15) abuts against the side of each ring plate (14) far away from the outer plate (1).

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