Sealed electrolytic cell and high pressure electrolytic cell

Abstract

The present application relates to a kind of sealed electrolytic unit and a kind of high-pressure electrolytic cell formed by the electrolytic unit, belong to pressure electrolytic cell technical field.The electrolytic unit is by a pair of electrode plate, the inner ring sealing pad of abutting on the positive and negative side of electrode plate and the electrolytic diaphragm of being clamped between the opposite side of a pair of electrode plate, the outer periphery of electrode plate of abutting on each other is equipped with the outer sealing ring of the gap between the outer periphery of adjacent electrode plate is sealed, the two inner ring sealing pads of a pair of electrode plate are respectively with the two sides of electrolytic diaphragm form two circles line sealings of each other staggered, greatly improve the sealing property;With multiple the high-pressure electrolytic cell of this electrolytic unit is stacked and compressed after each other can realize no leakage high-pressure hydrogen production oxygen production.

Description

Technical Field

[0001] This invention relates to an electrolysis unit structure for a high-voltage electrolytic cell and a high-voltage electrolytic cell formed from the electrolysis unit structure, belonging to the technical field of pressure electrolytic cells. Background Technology

[0002] Chinese patent CN219032404U discloses an electrolytic cell for producing high-pressure hydrogen and oxygen, such as... Figure 1 As shown, the electrolytic cell is composed of three types of planar components: an electrode plate, a sealing gasket, and a diaphragm, all of which are flat and attached together. Each electrolytic cell is formed by stacking and tightly bonding the first sealing gasket 103, the anode plate 104, the second sealing gasket 106, the cathode plate 107, the second sealing gasket 106, and the diaphragm 105 together. Because the electrode plate, sealing gasket, and diaphragm of the electrolytic cell are all flat and attached to each other, a planar seal is formed between them after compression. However, the inventors of the aforementioned patent discovered in subsequent experiments during the fabrication of the electrolytic cell that as the electrolytic reaction continuously generates gases (hydrogen and oxygen) and gradually builds up high pressure, gas-liquid leakage occurs between the electrode plate, sealing gasket, and diaphragm, resulting in seal failure. Therefore, the inventors of the aforementioned patent conducted in-depth research on the component sealing structure of the electrolytic cell's electrolytic cell assembly and made further improvements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to improve the electrolysis unit structure of the existing high-pressure electrolytic cell to meet the needs of high-pressure electrolysis sealing and to form a high-pressure electrolytic cell with reliable sealing to achieve high-pressure extraction of hydrogen and oxygen.

[0004] The technical solution proposed by this invention to solve the above-mentioned technical problems is as follows: A sealed electrolysis unit, comprising a pair of electrode plates, inner ring sealing gaskets abutting the front and back sides of the electrode plates, and an electrolytic diaphragm sandwiched between the opposite sides of the pair of electrode plates. One of the electrode plates is connected to the positive terminal of the power supply as the anode, and the other is connected to the negative terminal of the power supply as the cathode. The middle of the front and back sides of the electrode plates has an electrolysis region participating in the electrolysis reaction, and an inlet hole, two outlet gas holes, and multiple small through holes are formed in this region. The electrolytic diaphragm covers the electrolysis region and is sandwiched between two opposing inner ring sealing gaskets. The electrolytic diaphragm has openings respectively for the inlet hole and the outlet gas hole. The membrane opening corresponds to the hole; an outer sealing ring is provided on the outer periphery of a pair of electrode plates that are in contact with each other to seal the gap between the outer peripheries of the pair of electrode plates; a convex ring is formed on the outward side of the inner ring sealing gasket, and the diameters of the two convex rings of the two inner ring sealing gaskets on opposite sides of the two electrode plates, which respectively constitute the negative electrode plate and the positive electrode plate, are different; the convex ring of the inner ring sealing gasket on one electrode plate of the pair of electrode plates is in contact with one side of the electrolytic diaphragm to form a first ring line seal, and the convex ring of the inner ring sealing gasket on the other electrode plate is in contact with the other side of the electrolytic diaphragm to form a second ring line seal; the first ring line seal and the second ring line seal are staggered from each other on the periphery.

[0005] The second technical solution proposed by the present invention to solve the above-mentioned technical problems is: a high-voltage electrolytic cell, which is formed by stacking and pressing together multiple sealed electrolytic units of the above-mentioned technical solution one. The liquid inlet hole and its corresponding membrane opening are used for the electrolyte to enter and fill the electrolytic area on both sides of the electrode plate. The two liquid outlet gas holes and their corresponding membrane openings are used to export the gas and liquid after electrolysis reaction on the cathode side and the anode side respectively.

[0006] After in-depth research into the component sealing structure of the existing electrolytic cell unit assembly, the inventors of this patent application discovered the following: 1. The seal formed between the compressed electrode plate, gasket, and diaphragm is planar. Due to manufacturing precision limitations, it is difficult to achieve a high degree of flatness in the sealing surfaces of the electrode plate, gasket, and diaphragm. When the electrolytic reaction zone gradually generates gas and liquid to form high pressure, a large pressure difference is created with the outside environment. Under this large pressure difference, the seal between the electrode plate, gasket, and diaphragm is prone to failure. 2. Because the seal formed between the electrode plate, gasket, and diaphragm is planar, although it is constrained by axial force after compression, there is no effective constraint in the radial direction. Therefore, under the force of high-pressure gas and liquid generated in the electrolytic reaction zone, small movements are easily generated on the plane, which leads to the easy failure of the seal between the electrode plate, gasket, and diaphragm.

[0007] The beneficial effects of this invention are as follows: Because the inner ring sealing gasket is designed between the sides of a pair of electrode plates, when the pair of electrode plates constituting the cathode and anode are in close contact with each other and the electrolytic diaphragm is sandwiched in between, the two opposing inner ring sealing gaskets on the opposite sides of the pair of electrode plates form two staggered line seals with the two sides of the electrolytic diaphragm (the first line seal and the second line seal). Therefore, this invention transforms the existing planar seal between the sealing gasket and the electrolytic diaphragm and the electrode plate into a two-line seal, greatly improving the sealing performance. Simultaneously, because of the outer sealing ring set around the outer periphery of the electrode plates, a seal is formed between adjacent electrode plates around the outer periphery, which can withstand a large pressure difference between the electrolytic reaction area and the outside without leakage; moreover, it can limit the radial outward sliding of the inner ring sealing gasket, preventing leakage due to radial movement of the inner ring sealing gasket on the sides of the electrode plates. As for the pressure difference between the membrane openings corresponding to the liquid inlet and liquid outlet of the inner ring of the electrolytic diaphragm, since the seal of the outer ring of the electrolytic diaphragm is guaranteed, the gas-liquid pressure difference in the inner ring of the electrolytic diaphragm will gradually self-balance and disappear. When such electrolysis units are used to construct a high-pressure electrolytic cell, the high-pressure electrolytic cell and its electrolysis units can reach the required high pressure after continuous electrolysis without worrying about leakage, thereby achieving high-pressure hydrogen-to-oxygen production without leakage, that is, producing high-pressure hydrogen and oxygen.

[0008] Furthermore, the outer sealing ring is fixed to the outer periphery of a pair of electrode plates that are in contact with each other.

[0009] Furthermore, the outer sealing ring is fitted onto the outer periphery of multiple stacked and pressed sealed electrolysis units, and fixed to the outermost electrode plate.

[0010] Furthermore, the fixing is achieved through bolt connection, welding, key-keyway connection, or pin-pin hole connection.

[0011] Furthermore, the convex ring is an O-ring or has a cross-section of other shapes.

[0012] Furthermore, the convex ring is an adhesive strip that is glued to the outward-facing hollow side of the inner ring sealing gasket.

[0013] Furthermore, the convex ring is a plating layer formed on the outward-facing empty side of the inner ring sealing gasket.

[0014] Furthermore, the convex ring is integrally formed with the inner ring sealing gasket. Attached Figure Description

[0015] The following description, in conjunction with the accompanying drawings, further illustrates an electrolysis unit and a high-voltage electrolytic cell of the present invention.

[0016] Figure 1 This is a schematic diagram of the sealing assembly of an electrolysis unit in an existing electrolyzer for producing high-pressure hydrogen and oxygen.

[0017] Figure 2 This is a schematic diagram of the electrolysis unit structure in Example 1.

[0018] Figure 3 yes Figure 2 AA-direction section view.

[0019] Figure 4 yes Figure 2 A magnified view of the area within the circle at point B.

[0020] Figure 5 yes Figure 2 A schematic diagram of the structure of an electrode plate and an inner ring sealing gasket in the middle of the decomposition.

[0021] Figure 6 This is a schematic diagram of the exploded structure of a high-voltage electrolytic cell in Example 2.

[0022] Figure 7 yes Figure 6 A schematic diagram of the combined structure of a high-voltage electrolytic cell. Detailed Implementation Example 1

[0023] This embodiment provides a sealed electrolysis unit, such as Figure 2 As shown, it consists of a pair of electrode plates 1, an inner ring sealing gasket 6 abutting against the side of the electrode plates 1, and an electrolytic diaphragm 10 sandwiched between the opposite sides of the pair of electrode plates 1. One of the pair of electrode plates 1 is connected to the positive terminal of the power supply as the anode, and the other of the pair of electrode plates 1 is connected to the negative terminal of the power supply as the cathode; the pair of electrode plates 1, the inner ring sealing gasket 6, and the electrolytic diaphragm 10 are pressed tightly against each other. Figure 3 As shown, the electrode plate 1 has an electrolysis region 100 in the middle of its front and back sides, which participates in the electrolysis reaction. Within this region, there is an inlet hole 2, two outlet gas holes 3-1 and 3-2, and multiple small through holes 4. An electrolytic diaphragm 10 covers the electrolysis region 100 and is sandwiched between two opposing inner ring sealing gaskets 6. The electrolytic diaphragm 10 has membrane openings corresponding to the inlet hole 2 and the outlet gas holes 3-1 and 3-2, respectively.

[0024] like Figure 2 and Figure 3 As shown, an outer sealing ring 7 is provided on the outer periphery of a pair of electrode plates 1 that are in contact with each other, which seals the gap between the outer periphery of the pair of electrode plates 1 (which are also two adjacent electrode plates 1), and is fixed to the outer periphery of the electrode plates 1 by bolts 9.

[0025] like Figure 4 , 5 As shown, a raised ring 8 is formed on the outward-facing side of the inner ring sealing gasket 6. In this embodiment, the raised ring 8 is an O-ring that is embedded in the outward-facing empty side of the inner ring sealing gasket 6. Figure 4As shown, the two convex rings 8 of the two inner ring sealing gaskets 6 on opposite sides of the pair of electrode plates 1, which respectively constitute the negative electrode plate and the positive electrode plate, have different ring diameters. Figure 4 As shown, the inner ring sealing gasket 6 of one of the electrode plates 1 has a raised ring 8 that abuts against one side of the electrolytic diaphragm 10 to form a first ring seal 5-1, and the inner ring sealing gasket 6 of the other electrode plate 1 has a raised ring 8 that abuts against the other side of the electrolytic diaphragm 10 to form a second ring seal 5-2; the first ring seal 5-1 and the second ring seal 5-2 are staggered from each other in the circumference. Example 2

[0026] This embodiment provides a high-voltage electrolytic cell, such as Figure 6 As shown, it is constructed by stacking and pressing together multiple electrolysis units from Embodiment 1. Figure 7 As shown, the inlet hole 2 of the electrode plate 1 and the corresponding second opening 20 on the electrolytic membrane 10 are used for the electrolyte to enter and fill the electrolytic regions 100 on both sides of the electrode plate. The two outlet gas holes 3-1 and 3-2 and the corresponding second openings 10-1 and 10-2 on the electrolytic membrane 10 are used to export the gas and liquid after the electrolytic reaction on the cathode side and the anode side, respectively.

[0027] The outer sealing ring 7 is fitted onto the outer periphery of multiple stacked and pressed sealed electrolysis units, and is fixed to the outer surface of the two outermost electrode plates 1 by bolts 9.

[0028] The convex ring 8 in Embodiments 1 and 2 above can also be modified as follows:

[0029] 1) The raised rings 8 are adhesive strips that are glued to the outer side of the inner ring sealing gasket 6;

[0030] 2) The raised ring 8 is a coating formed on the outer side of the inner ring sealing gasket 6, such as a ceramic coating.

[0031] 3) The raised ring 8 is a raised ring strip integrally made with the inner ring gasket 6, that is, the raised ring 8 is part of the same material as the inner ring gasket 6.

[0032] 4) The cross-sectional shape of the convex ring 8 can be any reasonable shape other than O-shape, such as triangle, quadrilateral, etc.

[0033] 5) The number of convex rings 8 used for sealing is unlimited; it can be 1, 2, 3, 4, or 5, etc.

[0034] 6) The outer sealing ring 7 can also be fixed by welding, key-keyway connection or pin-pin hole connection.

[0035] In the above embodiment, the electrode plate 1 is circular, but this does not mean that a circle is the only possible shape for the electrode plate. The electrode plate 1 can also be square, rhomboid, elliptical, or polygonal, or other shapes. Similarly, the annular rings of the inner sealing gasket 6 and the outer sealing ring 7 can be circular, square, or other annular rings.

[0036] In addition, other prior art of the electrolysis unit and electrolytic cell involved in the above embodiments can be found in the Chinese patents or similar publications mentioned in the background art, and will not be repeated here.

[0037] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealed electrolysis unit, comprising a pair of electrode plates, inner ring sealing gaskets abutting the front and back sides of the electrode plates, and an electrolytic diaphragm sandwiched between opposite sides of the pair of electrode plates, wherein one of the electrode plates is connected to the positive terminal of a power supply as the anode and the other is connected to the negative terminal of a power supply as the cathode, wherein the front and back sides of the electrode plates have an electrolysis region in the middle for participating in the electrolysis reaction, and an inlet hole, two outlet gas holes, and multiple small through holes are formed in the region, the electrolytic diaphragm covers the electrolysis region and is sandwiched between two opposing inner ring sealing gaskets, and the electrolytic diaphragm has membrane openings corresponding to the inlet hole and the outlet gas holes respectively; characterized in that: An outer sealing ring is provided around the outer periphery of a pair of electrode plates that are in contact with each other, sealing the gap between the outer peripheries of the pair of electrode plates. A convex ring is formed on the outward-facing side of the inner ring sealing gasket, and the diameters of the two convex rings of the two inner ring sealing gaskets on opposite sides of the two electrode plates, namely the negative electrode plate and the positive electrode plate, are different. The convex ring of the inner ring sealing gasket on one electrode plate of the pair of electrode plates is in contact with one side of the electrolytic diaphragm to form a first ring line seal, and the convex ring of the inner ring sealing gasket on the other electrode plate is in contact with the other side of the electrolytic diaphragm to form a second ring line seal. The first ring line seal and the second ring line seal are staggered from each other on the periphery. The convex ring is an adhesive strip glued to the outward-facing empty side of the inner ring sealing gasket, or the convex ring is a ring of plating formed on the outward-facing empty side of the inner ring sealing gasket, or the convex ring is a convex ring integrally formed with the inner ring sealing gasket; or the convex ring is an O-ring embedded in the outward-facing empty side of the inner ring sealing gasket.

2. The electrolysis unit according to claim 1, characterized in that: The outer sealing ring is fixed on the outer periphery of a pair of electrode plates that are in contact with each other.

3. A high-voltage electrolytic cell, characterized in that: It is formed by stacking and pressing together multiple electrolysis units as described in claim 1. The liquid inlet and its corresponding membrane opening are used for the electrolyte to enter and fill the electrolysis areas on both sides of the electrode plate. The two liquid outlet and their corresponding membrane openings are used to export the gas and liquid after electrolysis reaction on the cathode side and the anode side, respectively.

4. The high-voltage electrolytic cell according to claim 3, characterized in that: The outer sealing ring is fitted onto the outer periphery of multiple stacked and pressed sealed electrolysis units and fixed to the outermost electrode plate.

5. The electrolysis unit according to claim 2 or the high-voltage electrolysis cell according to claim 4, characterized in that: The fixing is achieved through bolt connection, welding, key-keyway connection, or pin-pin hole connection.

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