Nitrogen charging valve of hydrogen production equipment

Abstract

The utility model discloses a nitrogen charging valve of hydrogen production equipment, and particularly relates to the technical field of valves, which comprises a tank body, the top of the tank body is in threaded connection with a first valve body, the top of a through hole of the first valve body is in threaded connection with a second valve body, and a first control ring is fixedly embedded at the bottom of the through hole of the first valve body. The edge of the first control ring is slidably connected with a plurality of sliding frames, the bottoms of the sliding frames are jointly connected with a first movable plug, the first movable plug is matched with a center hole of the first control ring, and the two ends of a top half ring of each sliding frame extend downwards to form first springs in a compressed state. The bottom of each first spring is fixedly connected with a first control ring, the bottom of the second valve body presses down a top half ring of the sliding frame, and a one-way ventilation mechanism for filling nitrogen into the tank body is installed in a through hole of the second valve body. And the injury probability of operators is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a nitrogen charging valve for hydrogen production equipment. Background Art

[0002] Alkaline electrolytic water hydrogen production is a method of decomposing water into hydrogen and oxygen through an electrolysis process, usually using an aqueous solution containing an electrolyte (such as potassium hydroxide KOH or sodium hydroxide NaOH) to improve conductivity. Nitrogen charging replacement is a conventional shutdown protection measure for water electrolysis hydrogen production. When shutting down, a nitrogen charging valve is used to fill nitrogen into the hydrogen separator or oxygen separator to displace hydrogen or oxygen.

[0003] Since the nitrogen charging valve needs to be frequently opened and closed, and this valve will come into contact with alkaline solution and may be blocked by factors such as alkaline solution crystallization, this valve is prone to damage and needs to be frequently overhauled. In this context, when replacing the valve at the lower inlet nitrogen charging port, it is necessary to completely remove the alkali, which greatly increases the economic cost and time cost of replacement. Moreover, when replacing the nitrogen charging port valve, the residual alkaline solution in the valve is prone to splash, causing injury to personnel. Therefore, a new type of nitrogen charging valve for hydrogen production equipment is needed. Summary of the Utility Model

[0004] To solve the above problems, the utility model discloses a nitrogen charging valve for hydrogen production equipment.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] A nitrogen charging valve for hydrogen production equipment includes a tank body. The top of the tank body is threadedly connected with a first valve body. The top of the through hole of the first valve body is threadedly connected with a second valve body. The bottom of the through hole of the first valve body is fixedly inlaid with a first control ring. The edge of the first control ring is slidably connected with a plurality of sliding frames. The bottoms of the plurality of sliding frames are commonly connected with a first movable plug, and the first movable plug is adapted to the central hole of the first control ring. The two ends of the top half-ring of each sliding frame respectively extend downward with a first spring in a compressed state, and the bottom of each first spring is fixedly connected with the first control ring. The bottom of the second valve body presses down the top half-ring of the sliding frame. A one-way ventilation mechanism for filling nitrogen into the tank body is installed in the through hole of the second valve body.

[0007] As a preferred technical solution of the utility model, the vertical through holes of the first valve body and the second valve body are coaxial.

[0008] As a preferred technical solution of the utility model, the top of the first movable plug is a frustum that gradually contracts upward, and the central hole of the first control ring is adapted to the frustum of the first movable plug.

[0009] As a preferred technical solution of the present utility model, the one-way ventilation mechanism includes: a second control ring fixedly embedded in the vertical through hole of the second valve body. A plurality of sliding rods are fixedly connected to the bottom surface of the second control ring. A second movable plug is slidably connected to the plurality of sliding rods, and the second movable plug is adapted to the central hole of the second control ring. A plurality of second springs in a stretched state extend upward from the edge of the second movable plug, and each second spring is fixedly connected to the second control ring.

[0010] As a preferred technical solution of the present utility model, the top of the second movable plug is a frustum that gradually contracts upward, and the central hole of the second control ring is adapted to the frustum of the second movable plug.

[0011] As a preferred technical solution of the present utility model, an O-ring is press-fitted on the horizontal contact surface between the tank body and the first valve body, and an O-ring is press-fitted on the horizontal contact surface between the first valve body and the second valve body.

[0012] As a preferred technical solution of the present utility model, both the first valve body and the second valve body are provided with external hexagonal nuts.

[0013] The beneficial effects of the present utility model are as follows:

[0014] First, when replacing the nitrogen filling valve blocked by the crystallization of the caustic solution, rotate the second valve body. During the upward movement of the second valve body, the first spring gradually elongates to push up the sliding frame, so that the first movable plug blocks the central hole of the first control ring, and the second valve body can be unscrewed only after the first movable plug completely blocks the central hole of the first control ring, so that the caustic solution inside the hydrogen separator or the oxygen separator will not splash outwards. Thanks to the anti-splash design, the waiting time for the tank body to drain the caustic solution can be reduced, and the probability of the operator being injured is reduced;

[0015] Second, a one-way ventilation mechanism is provided inside the second valve body, which can effectively reduce the risk of caustic solution backflow during nitrogen filling, and reduce the risk of crystallization blockage after the caustic solution is poured into the nitrogen filling valve;

[0016] Second, when replacing the nitrogen filling valve blocked by the crystallization of the caustic solution, separating the first valve body and the second valve body can quickly and effectively clear the blockage caused by the crystallization of the caustic solution, improve the maintenance efficiency, and reduce the use cost. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the embodiment of the present utility model installed on the tank body;

[0018] Figure 2 It is a schematic overall structural diagram of the embodiment of the present utility model;

[0019] Figure 3 It is a schematic overall cross-sectional view of the embodiment of the present utility model;

[0020] Figure 4 Structural schematic diagram of the first control ring, the first movable plug, the sliding frame and the first spring in the embodiment of the present utility model;

[0021] Figure 5 Exploded view of the one-way ventilation mechanism in the embodiment of the present utility model.

[0022] List of attached drawing reference signs:

[0023] 1, tank body; 2, first valve body; 3, second valve body; 4, first control ring; 5, first movable plug; 6, sliding frame; 7, first spring;

[0024] 8, one-way ventilation mechanism; 801, second control ring; 802, second movable plug; 803, sliding rod; 804, second spring;

[0025] 9, O-ring; 10, plugging plate; 11, support frame. Specific embodiments

[0026] The present utility model will be further clarified below in conjunction with the attached drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0027] Please refer to Figures 1-5 , a nitrogen charging valve for a hydrogen production device, including a tank body 1, and the bottom of the tank body 1 is supported by two support frames 11. A through groove for bolt penetration and fixation is provided at the bottom of the support frame 11. The tank body 1 is used for adding alkali solution for electrolyzing water to produce hydrogen. A nitrogen charging valve is provided at each end of the tank body 1, and the two nitrogen charging valves are respectively communicated with a hydrogen separator and an oxygen separator arranged inside the tank body 1. Nitrogen charging and replacement is a conventional shutdown protection measure for water electrolysis hydrogen production. When shutting down, the nitrogen charging valve is used to charge nitrogen into the hydrogen separator or the oxygen separator to replace hydrogen or oxygen. The nitrogen charging valve is made of corrosion-resistant materials. The maintenance hole at the top of the tank body 1 is sealed with a plugging plate, and the tank body 1 is provided with a plurality of interfaces that can be communicated with external pipelines.

[0028] The top of the tank body 1 is threadedly connected with a first valve body 2. The top of the through hole of the first valve body 2 is threadedly connected with a second valve body 3. The vertical through holes of the first valve body 2 and the second valve body 3 are coaxial. The top of the first valve body 2 is threadedly connected with a nitrogen-filling pipeline. At the bottom of the through hole of the first valve body 2, a first control ring 4 is fixedly inlaid. The edge of the first control ring 4 is slidably connected with a plurality of sliding frames 6. The plurality of sliding frames 6 are evenly distributed in a ring shape with respect to the first control ring 4. The bottoms of the plurality of sliding frames 6 are commonly connected with a first movable plug 5, and the first movable plug 5 is adapted to the central hole of the first control ring 4. Among them, the top of the first movable plug 5 is a frustum that gradually contracts upward, and the central hole of the first control ring 4 is adapted to the frustum of the first movable plug 5, which is convenient for plugging together for sealing. At both ends of the top half-ring of each sliding frame 6, a first spring 7 in a compressed state extends downward respectively, and the bottom of each first spring 7 is fixedly connected with the first control ring 4. The bottom of the second valve body 3 presses down on the top half-ring of the sliding frame 6. A circular groove for inserting the first spring 7 is provided at the end of the top half-ring of the sliding frame 6, and the first control ring 4 is also provided with a circular groove for inserting the first spring 7.

[0029] A one-way ventilation mechanism 8 for filling nitrogen into the tank body 1 is installed in the through hole of the second valve body 3. The one-way ventilation mechanism 8 includes: a second control ring 801 fixedly inlaid in the vertical through hole of the second valve body 3. The bottom surface of the second control ring 801 is fixedly connected with a plurality of sliding rods 803. The plurality of sliding rods 803 are commonly slidably connected with a second movable plug 802, and the second movable plug 802 is adapted to the central hole of the second control ring 801. A ring-shaped protrusion is provided at the bottom of the sliding rod 803 to limit the movement range of the second movable plug 802 and prevent the second movable plug 802 from falling off the sliding rod 803. A plurality of second springs 804 in a stretched state extend upward from the edge of the second movable plug 802, and each second spring 804 is fixedly connected with the second control ring 801. The top of the second movable plug 802 is a frustum that gradually contracts upward, and the central hole of the second control ring 801 is adapted to the frustum of the second movable plug 802, which is convenient for plugging together for sealing.

[0030] An O-ring 9 is pressed between the horizontal contact surfaces of the tank body 1 and the first valve body 2, and an O-ring 9 is pressed between the horizontal contact surfaces of the first valve body 2 and the second valve body 3. The tank body 1, the first valve body 2, and the second valve body 3 are all provided with ring grooves adapted to the O-ring 9. Both the first valve body 2 and the second valve body 3 are provided with external hexagonal nuts, which are convenient for using a wrench to tighten the first valve body 2 and the second valve body 3.

[0031] Working principle:

[0032] When filling nitrogen into the hydrogen separator or oxygen separator using the nitrogen filling valve, the nitrogen in the external pipeline flows into the first valve body 2 through the one-way ventilation mechanism 8 inside the second valve body 3. Then, the nitrogen flows through the central hole of the first control ring 4 and into the hydrogen separator or oxygen separator (at this time, the first control ring 4 is separated from the first movable plug 5), thereby discharging hydrogen or oxygen through the exhaust pipeline of the hydrogen separator or oxygen separator. When replacing the alkaline liquid crystal blockage of the nitrogen filling valve, rotate the second valve body 3. During the upward movement of the second valve body 3, the first spring 7 gradually elongates and pushes up the sliding frame 6, causing the first movable plug 5 to block the central hole of the first control ring 4. And the second valve body 3 can be unscrewed only after the first movable plug 5 completely blocks the central hole of the first control ring 4, so that the alkaline liquid inside the hydrogen separator or oxygen separator will not splash outwards. Then, the removed second valve body 3 and the first valve body 2 can be cleaned.

[0033] When nitrogen passes through the one-way ventilation mechanism 8 inside the second valve body 3, the nitrogen pushes the second movable plug 802 to slide along the slide bar 803, causing the second movable plug 802 to separate from the second control ring 801. The nitrogen flows through the central hole of the second control ring 801 and into the first valve body 2. When the nitrogen supply stops, under the contraction of the second spring 804, the second movable plug 802 returns to its position to block the central hole of the second control ring 801.

[0034] It should be noted that the above content only illustrates the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements all fall within the protection scope of the claims of the present invention.

Claims

1. A nitrogen filling valve for a hydrogen production device, comprising a tank body (1), characterized in that, The top of the tank body (1) is threadedly connected with a first valve body (2). The top of the through hole of the first valve body (2) is threadedly connected with a second valve body (3). The bottom of the through hole of the first valve body (2) is fixedly inlaid with a first control ring (4). The edge of the first control ring (4) is slidably connected with a plurality of sliding frames (6). The bottoms of the plurality of sliding frames (6) are commonly connected with a first movable plug (5), and the first movable plug (5) is adapted to the central hole of the first control ring (4). The two ends of the top half ring of each sliding frame (6) respectively extend downward with a first spring (7) in a compressed state, and the bottom of each first spring (7) is fixedly connected with the first control ring (4). The bottom of the second valve body (3) presses down the top half ring of the sliding frame (6). A one-way ventilation mechanism (8) for filling nitrogen into the tank body (1) is installed in the through hole of the second valve body (3).

2. The nitrogen charging valve of a hydrogen production device according to claim 1, characterized in that, The vertical through holes of the first valve body (2) and the second valve body (3) are coaxial.

3. The nitrogen filling valve of a hydrogen production device according to claim 1, characterized in that, The top of the first movable plug (5) is a frustum that gradually contracts upward, and the central hole of the first control ring (4) is adapted to the frustum of the first movable plug (5).

4. The nitrogen charging valve of a hydrogen production device according to claim 1, characterized in that, The one-way ventilation mechanism (8) includes: a second control ring (801) fixedly inlaid in the vertical through hole of the second valve body (3). The bottom surface of the second control ring (801) is fixedly connected with a plurality of sliding rods (803). The plurality of sliding rods (803) are commonly slidably connected with a second movable plug (802), and the second movable plug (802) is adapted to the central hole of the second control ring (801). The edge of the second movable plug (802) extends upward with a plurality of second springs (804) in a stretched state, and each second spring (804) is fixedly connected with the second control ring (801).

5. The nitrogen charging valve of a hydrogen production device according to claim 4, characterized in that, The top of the second movable plug (802) is a frustum that gradually contracts upward, and the central hole of the second control ring (801) is adapted to the frustum of the second movable plug (802).

6. The nitrogen charging valve of a hydrogen production device according to claim 1, characterized in that An O-ring (9) is pressed between the horizontal contact surfaces of the tank body (1) and the first valve body (2). An O-ring (9) is pressed between the horizontal contact surfaces of the first valve body (2) and the second valve body (3).

7. The nitrogen filling valve of a hydrogen production device according to claim 1, characterized in that The first valve body (2) and the second valve body (3) are both provided with external hexagonal nuts.

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