Equipment for producing hydrogen by electrolyzing water

Abstract

According to the water electrolysis hydrogen production equipment, a square oil cylinder and a square piston rod are adopted for a hydraulic machine in the water electrolysis hydrogen production equipment, and the square piston rod drives a square piston to do reciprocating motion in the square oil cylinder, so that a movable end plate in an electrolytic bath moves away from or close to a fixed end plate, and an electrolytic stack is released or pressed; and compared with a traditional circular piston rod, the square piston rod has a larger contact area with the movable end plate in the electrolytic tank, so that the stress of the electrode assembly in the electrolytic tank is more uniform, and the pressing efficiency and the sealing effect of the hydraulic machine can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic water hydrogen production equipment, and particularly relates to an electrolytic water hydrogen production equipment. Background Art

[0002] Hydrogen is known as the cleanest energy source with the most development prospects in the 21st century due to its advantages of being clean, pollution-free, and having high heat. According to the source of hydrogen, hydrogen can be divided into gray hydrogen, blue hydrogen, and green hydrogen. Green hydrogen can achieve zero carbon emissions during the preparation process, so it is also called the purest green energy. Among them, electrolytic water hydrogen production is one of the most important means of green hydrogen production currently.

[0003] Currently, a circular hydraulic press is mostly used to apply pressure to the electrolytic stack in electrolytic water hydrogen production equipment. However, with the development of technology, more and more square electrolytic stacks have emerged, and it is necessary to install a square steel plate at the end of the circular piston rod in the circular hydraulic press to convert the load stress, which easily causes the problem of uneven distribution of the sealing compressive stress of the electrolytic stack.

[0004] Based on this, there is an urgent need for an electrolytic water hydrogen production equipment at present to solve the problem that the traditional circular hydraulic press easily causes uneven distribution of the sealing compressive stress of the electrolytic stack. Summary of the Utility Model

[0005] The purpose of this application is to provide an electrolytic water hydrogen production equipment to solve the technical problem that the circular hydraulic press in the prior art easily causes uneven distribution of the sealing compressive stress of the electrolytic stack.

[0006] To achieve the above purpose, this application provides an electrolytic water hydrogen production equipment, which includes a fixed end plate, a movable end plate, an electrolytic stack arranged between the fixed end plate and the movable end plate, and a hydraulic press. The electrolytic stack includes end plates at both ends and a bipolar plate assembly; the bipolar plate assembly includes a bipolar plate body, a pole network, and a seal connected in sequence; among them, a diaphragm or an ion membrane is arranged between any two bipolar plate assemblies; the bipolar plate assembly is arranged between two end plates; the hydraulic press includes:

[0007] A square oil cylinder;

[0008] A cylinder head connected to the top of the square oil cylinder;

[0009] A square piston arranged inside the square oil cylinder;

[0010] A square piston rod, one end of which is connected to the square piston, and the other end passes through the end cover and is connected to the movable end plate;

[0011] The square piston rod drives the square piston to reciprocate in the square oil cylinder, so that the movable end plate moves away from or approaches the fixed end plate, thereby releasing or pressing the electrolytic stack.

[0012] Optionally, a first advance and retreat oil port and a second advance and retreat oil port are arranged on the lower side of the square oil cylinder;

[0013] A first hydraulic oil cavity is formed between the square piston and the square oil cylinder, and hydraulic oil is injected into or withdrawn from the first hydraulic oil cavity through the first advance and retreat oil port;

[0014] A second hydraulic oil cavity is formed among the square piston rod, the cylinder head and the square oil cylinder, and hydraulic oil is injected into or withdrawn from the first hydraulic oil cavity through the second advance and retreat oil port.

[0015] Optionally, when pressing the electrolytic stack, hydraulic oil is injected into the first hydraulic oil cavity from the first advance and retreat oil port, and the hydraulic oil in the second hydraulic oil cavity is withdrawn from the second advance and retreat oil port;

[0016] When releasing the electrolytic stack, hydraulic oil is injected into the second hydraulic oil cavity from the second advance and retreat oil port, and the hydraulic oil in the first hydraulic oil cavity is withdrawn from the first advance and retreat oil port.

[0017] Optionally, the cross-sectional area of the square piston rod accounts for 50% - 100% of the bottom area of the movable end plate.

[0018] Optionally, the hydraulic press further includes a piston seal arranged on the square piston for sealing the gap between the square piston and the square oil cylinder.

[0019] Optionally, the hydraulic press further includes an end cover seal arranged between the end cover and the square piston rod for sealing the gap between the end cover and the square piston rod.

[0020] Optionally, the hydraulic press further includes a dust ring arranged between the end cover and the square piston rod.

[0021] Optionally, a plurality of support main beams are arranged between the square oil cylinder and the fixed end plate, and two ends of the support main beam are respectively connected with the square oil cylinder and the fixed end plate;

[0022] The support main beam is in sliding contact with the movable end plate, so that the movable end plate makes a horizontal reciprocating motion on the support main beam under the drive of the square piston rod.

[0023] Optionally, the square piston rod and the square piston are integrally formed.

[0024] Optionally, struts are provided at the bottoms of both the square oil cylinder and the fixed end plate.

[0025] Compared with the prior art, the present application provides an electrolytic water hydrogen production device. In this electrolytic water hydrogen production device, a hydraulic press uses a square oil cylinder and a square piston rod. The square piston rod drives a square piston to reciprocate in the square oil cylinder, so that the movable end plate in the electrolytic cell moves away from or approaches the fixed end plate, to release or compress the electrolytic stack. Compared with the traditional circular piston rod, the contact area between the square piston rod and the movable end plate in the electrolytic cell is larger, so that the force on the electrode assembly in the electrolytic cell is more uniform, which can further improve the pressing efficiency and sealing effect of the hydraulic press. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of an electrolytic water hydrogen production device provided by an embodiment of the present application;

[0027] Figure 2 is a front view of a square oil cylinder provided by an embodiment of the present application;

[0028] Figure 3 is a cross-sectional view of a square oil cylinder provided by an embodiment of the present application;

[0029] Wherein, the Figures 1 to 3 reference numerals in the drawings are described as follows:

[0030] 10 - Hydraulic press; 11 - Square oil cylinder; 111 - First oil inlet and outlet; 112 - Second oil inlet and outlet; 113 - First hydraulic oil chamber; 114 - Second hydraulic oil chamber; 12 - Cylinder head; 13 - Square piston; 14 - Piston seal; 15 Square piston rod; 16 - End cover seal; 17 - Dust ring; 20 - Fixed end plate; 30 - Movable end plate; 40 - Electrolytic stack; 50 - Support main beam; 60 - Strut. Detailed Embodiments

[0031] To make the objectives, advantages, and features of the present application clearer, the following further describes in detail the electrolytic water hydrogen production device proposed in the present application with reference to the Figures 1 to 3 drawings. It should be noted that the drawings are in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the objectives of the embodiments of the present application.

[0032] For ease of understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration. In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, unless otherwise stated, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; the meaning of "a plurality" is two or more. The term "comprising" and any deformation thereof mean non-exclusive inclusion, and there may be or be added one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0033] In addition, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. All the technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0034] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] Referring to Figures 1 to 3 , the present application provides an electrolytic water hydrogen production device, including: a hydraulic press 10 and an electrolytic stack 40. The hydraulic press 10 includes a fixed end plate 20 and a movable end plate 30.

[0036] Among them, the electrolytic stack 40 is arranged between the fixed end plate 20 and the movable end plate 30. The electrolytic stack 40 may specifically include end plates and a bipolar plate assembly. The end plates are located at both ends of the electrolytic stack 40. The bipolar plate assembly is arranged between the two end plates and specifically includes a bipolar plate body, a pole network and a seal connected in sequence. Among them, a diaphragm or an ion membrane is arranged between any two bipolar plate assemblies.

[0037] The hydraulic press 10 may specifically include a square oil cylinder 11, a cylinder head 12, a square piston 13, a piston seal 14, and a square piston rod 15.

[0038] Among them, the square oil cylinder 11 means that the outer shape of the oil cylinder is square. Compared with the traditional circular hydraulic cylinder, when the square oil cylinder provides the same pressing force for the electrolytic stack, the oil pressure inside it is smaller, effectively improving the sealing uniformity of the hydraulic cylinder.

[0039] The cylinder head 12 can be connected to the top of the square oil cylinder 11. After the cylinder head 12 and the square oil cylinder 11 are combined, a closed accommodation space can be formed. There are various connection methods between the cylinder head 12 and the square oil cylinder 11. For example, a square flange type bolt connection can be adopted between the cylinder head and the square cylinder block, or other connection methods such as snap connection and welding can also be used, which are not specifically limited.

[0040] The square piston 13 can be arranged inside the square oil cylinder 11.

[0041] Considering that there may be a gap between the square piston 13 and the square oil cylinder 11, in the embodiment of the present application, the hydraulic press 10 may further include a piston seal 14, which is arranged on the square piston 13 and is used to seal the gap between the square piston 13 and the square oil cylinder 11.

[0042] One end of the square piston rod 15 can be connected to the square piston 13, and the other end can pass through the end cover 12 and be connected to the movable end plate 30. There are various connection methods between the square piston rod 15 and the square piston 13. For example, the square piston rod 15 and the square piston 13 can be integrally formed, or other connection methods such as threaded connection and welding can also be used, which are not specifically limited. There are also various connection methods between the square piston rod 15 and the end cover 12. For example, threaded connection, welding and other connection methods can be adopted between the square piston rod 15 and the end cover 12, which are not specifically limited.

[0043] Considering that there may be a gap between the square piston rod 15 and the end cover 12, in the embodiment of the present application, the hydraulic press 10 may further include an end cover seal 16, which is arranged between the end cover 12 and the square piston rod 15 and is used to seal the gap between the end cover 12 and the square piston rod 15.

[0044] At the same time, considering that dust may fall due to the possible gap between the square piston rod 15 and the end cover 12, in the embodiment of the present application, the hydraulic press 10 may further include a dust ring 17 arranged between the end cover 12 and the square piston rod 15.

[0045] In the embodiment of the present application, the square piston rod 15 can drive the square piston 13 to reciprocate in the square oil cylinder 11, so that the movable end plate 30 moves away from or close to the fixed end plate 20, thereby releasing or pressing the electrolytic stack 40.

[0046] Specifically, a first oil inlet / outlet 111 and a second oil inlet / outlet 112 can be provided on the lower side of the square oil cylinder 11. A first hydraulic oil chamber 113 is formed between the square piston 13 and the square oil cylinder 11, and hydraulic oil is injected into or withdrawn from the first hydraulic oil chamber 113 through the first oil inlet / outlet 111; a second hydraulic oil chamber 114 is formed among the square piston rod 15, the cylinder head 12 and the square oil cylinder 11, and hydraulic oil is injected into or withdrawn from the first hydraulic oil chamber 113 through the second oil inlet / outlet 112.

[0047] When it is necessary to press the electrolytic stack 40, that is, when the hydraulic press 10 needs to provide a pressing force, hydraulic oil is injected into the first hydraulic oil chamber 113 from the first oil inlet / outlet 111, and at the same time, the hydraulic oil in the second hydraulic oil chamber 114 is withdrawn from the second oil inlet / outlet 112. The pressure in the first hydraulic oil chamber 113 is controlled to be greater than that in the second hydraulic oil chamber 114. At this time, the square piston 14 moves in the direction close to the electrolytic stack 40, driving the square piston rod 15 to push the movable end plate 30 to press the electrolytic stack 40.

[0048] When it is necessary to release the electrolytic stack 40, that is, when the hydraulic press 10 needs to provide a releasing force, hydraulic oil is injected into the second hydraulic oil chamber 114 from the second oil inlet / outlet 112, and at the same time, the hydraulic oil in the first hydraulic oil chamber 113 is withdrawn from the first oil inlet / outlet 111. The pressure in the second hydraulic oil chamber 114 is controlled to be greater than that in the first hydraulic oil chamber 113. At this time, the square piston 14 moves in the direction away from the electrolytic stack 40, driving the square piston rod 15 to pull the movable end plate 30 to release the electrolytic stack 40.

[0049] In the embodiment of the present application, the cross-sectional area of the square piston rod 15 can account for 50% to 100% of the bottom area of the movable end plate 30. Further, the larger the proportion of the cross-sectional area of the square piston rod 15 to the bottom area of the movable end plate 30, the better. The cross-sectional area of the square piston rod 15 can be equivalent to the bottom area of the movable end plate 30, that is, the cross-sectional area of the square piston rod 15 is approximately equal to the bottom area of the movable end plate 30, or the cross-sectional area of the square piston rod 15 is slightly smaller than the bottom area of the movable end plate 30. In this way, the contact area between the square piston rod and the movable end plate is larger, and the force on the electrode assembly of the electrolytic cell is more uniform, thereby improving the pressing efficiency and sealing effect of the hydraulic press.

[0050] In the embodiments of the present application, the electrolytic water hydrogen production device may further include a plurality of support main beams 50. The support main beams 50 are arranged between the square oil cylinder 11 and the fixed end plate 20, and both ends of the support main beam 50 are respectively connected to the square oil cylinder 11 and the fixed end plate 20. There are various connection methods between the support main beam 50 and the square oil cylinder 11 and the fixed end plate 20. For example, threaded connection, welding or other connection methods can be adopted between the support main beam 50 and the square oil cylinder 11 and the fixed end plate 20, and specific limitations are not made.

[0051] Furthermore, the embodiments of the present application do not make specific limitations on the number of the support main beams 50, and it can be as Figure 1 shown, one support main beam is arranged in front of and behind the electrolytic cell respectively, or two support main beams can be arranged in front of and behind the electrolytic cell respectively, and specific adjustments can be made according to actual needs.

[0052] On the side of the movable end plate 30 close to the square oil cylinder 11, the movable end plate 30 is in sliding contact with the support main beam 50, so that the movable end plate 30 makes a horizontal reciprocating motion on the support main beam 50 under the drive of the square piston rod 15.

[0053] Considering that in traditional circular hydraulic presses, the hydraulic cylinders are also circular, when installing a circular hydraulic press in an electrolytic water hydrogen production device, it is necessary to equip the circular oil cylinder with an installation support seat, which will increase the weight of the entire electrolytic water hydrogen production device and cause difficulties for subsequent equipment transportation and installation.

[0054] In view of this, in the embodiments of the present application, the square oil cylinder 11 can be used as the electrolytic cell support seat in the electrolytic water hydrogen production device, that is, the electrolytic cell support seat and the square oil cylinder 11 can be integrated. Pillars 60 can be arranged at the bottom of the square oil cylinder 11, and pillars 60 can also be arranged at the bottom of the fixed end plate 20. The pillars 60 are used to support the entire electrolytic water hydrogen production device.

[0055] In this way, compared with a circular hydraulic press, the square oil cylinder can directly be used as the electrolytic cell support seat in the electrolytic water hydrogen production device. On the one hand, the lateral dimension of the electrolytic cell is reduced, and the system compactness is improved. On the other hand, the weight of the electrolytic water hydrogen production device is reduced, which is convenient for subsequent equipment transportation and installation.

[0056] Compared with the prior art, the present application provides an electrolytic water hydrogen production device. In this electrolytic water hydrogen production device, the hydraulic press adopts a square oil cylinder and a square piston rod. The square piston rod drives a square piston to reciprocate in the square oil cylinder, so that the movable end plate in the electrolytic cell moves away from or approaches the fixed end plate, thereby releasing or pressing the electrolytic stack. Compared with the traditional circular piston rod, the contact area between the square piston rod and the movable end plate in the electrolytic cell is larger, so that the force on the electrode assembly in the electrolytic cell is more uniform, which can further improve the pressing efficiency and sealing effect of the hydraulic press; and due to the design of the square oil cylinder, the internal oil pressure is smaller, improving the sealing uniformity of the oil cylinder.

[0057] The above description is only a description of the preferred embodiments of the present application and does not limit the scope of the present application in any way. Any changes and modifications made by those of ordinary skill in the art of the present application based on the above disclosure fall within the protection scope of the claims.

Claims

1. A water electrolysis hydrogen production device, characterized in that: The hydrogen production equipment comprises a hydraulic press and an electrolytic stack, wherein the hydraulic press comprises a fixed end plate and a movable end plate, the electrolytic stack is arranged between the fixed end plate and the movable end plate, the electrolytic stack comprises end plates and a bipolar plate assembly at both ends; the bipolar plate assembly comprises a bipolar plate body, a polar grid and a seal connected in sequence; wherein a diaphragm or an ion membrane is arranged between any two bipolar plate assemblies; the bipolar plate assembly is arranged between two end plates; the hydraulic press comprises: Square cylinder; A cylinder cover connected to the top of the square oil cylinder; A square piston is arranged inside the square cylinder; A square piston rod, one end of which is connected to the square piston, and the other end of which passes through the end cover and is connected to the movable end plate; The square piston rod drives the square piston to perform reciprocating motion in the square oil cylinder, so that the movable end plate moves away from or close to the fixed end plate, so as to release or compress the electrolytic stack.

2. The hydrogen production equipment according to claim 1, characterized in that: The lower side of the square oil cylinder is provided with a first oil inlet and a second oil inlet and a second oil inlet; A first hydraulic oil chamber is formed between the square piston and the square oil cylinder, and hydraulic oil is injected into or withdrawn from the first hydraulic oil chamber through the first oil inlet and outlet ports; A second hydraulic oil chamber is formed between the square piston rod, the cylinder cover and the square oil cylinder, and hydraulic oil is injected into or withdrawn from the first hydraulic oil chamber through the second oil inlet and outlet ports.

3. The hydrogen production equipment according to claim 2, characterized in that: When the electrolytic stack is compressed, hydraulic oil is injected into the first hydraulic oil chamber from the first oil inlet and outlet ports, and hydraulic oil in the second hydraulic oil chamber is withdrawn from the second oil inlet and outlet ports; When the electrolytic stack is released, hydraulic oil is injected into the second hydraulic oil chamber from the second oil inlet and outlet ports, and hydraulic oil in the first hydraulic oil chamber is withdrawn from the first oil inlet and outlet ports.

4. The hydrogen production equipment according to claim 1, characterized in that: The cross-sectional area of ​​the square piston rod accounts for 50% to 100% of the bottom surface area of ​​the movable end plate.

5. The hydrogen production equipment according to claim 1, characterized in that: The hydraulic press further comprises a piston seal disposed on the square piston for sealing a gap between the square piston and the square oil cylinder.

6. The hydrogen production equipment according to claim 1, characterized in that: The hydraulic press further comprises an end cover seal disposed between the end cover and the square piston rod, for sealing a gap between the end cover and the square piston rod.

7. The hydrogen production equipment according to claim 1, characterized in that: The hydraulic press also includes a dust ring disposed between the end cover and the square piston rod.

8. The hydrogen production equipment according to claim 1, characterized in that: A plurality of supporting main beams are arranged between the square oil cylinder and the fixed end plate, and two ends of the supporting main beams are respectively connected to the square oil cylinder and the fixed end plate; The supporting main beam is in sliding contact with the movable end plate, so that the movable end plate performs horizontal reciprocating motion on the supporting main beam under the drive of the square piston rod.

9. The hydrogen production equipment according to claim 1, characterized in that: The square piston rod and the square piston are integrally formed.

10. The hydrogen production equipment according to any one of claims 1 to 9, characterized in that: The bottom of the square oil cylinder and the bottom of the fixed end plate are both provided with pillars.

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