A high-pressure gaseous hydrogen cylinder leak detection device

Abstract

The utility model discloses a high pressure gaseous hydrogen bottle leak detection device belongs to gas cylinder safety detection technical field. The device includes leak detection box and leak detection cover, and leak detection cover is from below to above and is divided into three layers structure of positioning layer, hollow layer and leak detection layer. Positioning layer is divided into a plurality of independent unit cells through high temperature resisting partition, and each unit cell can accommodate a gas cylinder, and is formed sealed space through the sealed upper ring cooperation with the sealed lower ring of gas cylinder. The one-way valve door is equipped with on each unit cell top and is communicated with leak detection layer, and hydrogen detection alarm instrument is installed at leak detection layer top. The device realizes the simultaneous, independent leak detection of multiple gas cylinders through physical isolation and gas guiding, and can quickly locate the leakage source, and has the advantages of high detection efficiency, accurate positioning and reusable.

Description

Technical Field

[0001] This utility model belongs to the field of gas cylinder safety detection technology, specifically relating to a high-pressure gaseous hydrogen cylinder leak detection device. Background Technology

[0002] Hydrogen cylinders are commonly used gas cylinders for storing and transporting hydrogen. The specifications of hydrogen cylinders vary depending on different needs and applications. Existing leak detection methods mostly employ overall immersion leak detection or single-sensor close-range detection. The former cannot simultaneously and quickly screen and accurately locate multiple cylinders, resulting in low efficiency; the latter may cause false alarms due to the diffusion characteristics of hydrogen or fail to promptly identify the specific leaking cylinder. Furthermore, some chemical reagent-based leak detection devices are often disposable or have complex structures that are difficult to clean and maintain, leading to high leak detection costs and failing to meet the needs of batch and repeated leak detection.

[0003] Chinese patent CN115979531B discloses a hydrogen storage cylinder sealing detection device. This device detects leaks by placing litmus solution inside a waterproof and breathable membrane at a height below the lower surface of the membrane. The gas mixture reacts with the litmus solution, producing carbonic acid that discolors the solution. The location of the leak can be determined by observing the discoloration. Simultaneously, the amount of hydrogen leaked is determined using an external chromatograph. However, this patent cannot provide timely warnings of hydrogen leaks, requiring time-consuming and labor-intensive manual inspection.

[0004] In summary, existing technologies have limitations in efficiently and accurately locating hydrogen leaking cylinders, and the leak detection devices are difficult to reuse repeatedly. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Therefore, the purpose of this utility model is to provide a high-pressure gaseous hydrogen cylinder leak detection device, which can solve the problems of existing technologies in efficiently and accurately locating hydrogen leaking cylinders and the difficulty in repeatedly using leak detection devices. This utility model provides a high-pressure gaseous hydrogen cylinder leak detection device, which includes a leak detection box and a leak detection cover. The leak detection cover is divided into three layers from bottom to top: a positioning layer, a hollow layer, and a leak detection layer. The positioning layer is divided into multiple cell sections adapted to the gas cylinder by high-temperature resistant partitions. The bottom of the high-temperature resistant partitions is sealed by a sealing plate. A sealing upper ring is provided in the middle of the cell sealing plate, and a sealing lower ring adapted to the sealing upper ring is provided on the side of the gas cylinder. Each cell section has a matching one-way valve above it, and the other side of the one-way valve is connected to the leak detection layer. A hydrogen detection alarm is provided at the top of the leak detection layer, and the leak detection cover is a transparent high-temperature resistant injection molded part.

[0007] Optionally, the leak detection cover is made of acrylic resin.

[0008] Optionally, the bottom of the upper sealing ring is provided with a groove, and the top of the lower sealing ring is provided with a protrusion, the protrusion and the groove being compatible.

[0009] Optionally, the bottom inner ring of the leak detection cover is provided with a rubber ring that is compatible with the rubber ring of the upper outer ring of the leak detection cover.

[0010] Optionally, the leak detection layer and the hollow layer are sealed except for the one-way valve.

[0011] Optionally, a heating plate is evenly provided at the bottom of the sealing plate, and the heating plate is connected to the control plate on the upper side of the leak detection cover.

[0012] Optionally, the one-way valve is connected to the arc-shaped groove at the top of the positioning layer.

[0013] In summary, this utility model has at least one of the following beneficial effects: (1) This utility model divides the leak detection cover into multiple independent cells through the positioning layer. Each cell is tightly fitted with the sealing ring of the gas cylinder through the upper sealing ring, creating an independent sealed gas chamber for each gas cylinder to be tested. If a gas cylinder leaks, hydrogen will first accumulate in its corresponding cell and enter the shared leak detection layer through the dedicated one-way valve above the cell. Finally, the hydrogen detection alarm at the top will detect and alarm, which can immediately lock the specific cell from which the hydrogen is coming out, thereby quickly locating which gas cylinder has leaked. This achieves simultaneous and parallel leak detection and precise location of multiple gas cylinders, greatly improving the detection efficiency.

[0014] (2) This utility model ensures its reusability through modular and durable material design. The leak detection cover is made of transparent acrylic resin and other high-temperature resistant injection molded parts, which are easy to observe the internal condition and are sturdy and durable. The heating plate set at the bottom of the sealing plate can moderately heat the cell area before and after leak detection. On the one hand, it can simulate the temperature environment of the gas cylinder under certain working conditions. On the other hand, it helps to dissipate residual moisture or gas left over from the previous leak detection, which is convenient for device reset and reuse. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a side view of a gas cylinder for a high-pressure gaseous hydrogen cylinder leak detection device according to the present invention; Figure 2 This is a top view of the positioning layer of a high-pressure gaseous hydrogen cylinder leak detection device according to the present invention; Figure 3 This is a front view of the overall structure of a high-pressure gaseous hydrogen cylinder leak detection device according to the present invention; List of symbols in the attached diagram: 1. Gas cylinder; 2. Lower sealing ring; 3. Heating plate; 4. Sealing plate; 5. Upper sealing ring; 6. Leak detection cover; 7. Leak detection box; 8. Sealing port; 9. Leak detection layer; 10. One-way valve; 11. High-temperature resistant partition; 12. Hydrogen detection alarm; 13. Hollow layer. Implementation

[0017] The following is in conjunction with the appendix Figure 1-3 This utility model will be described in further detail below.

[0018] Example 1, refer to Figure 1-3 In this embodiment, to address the problem of existing technologies where leak detection devices are difficult to reuse for efficiently and accurately locating hydrogen leaks in gas cylinders, this utility model discloses a high-pressure gaseous hydrogen cylinder leak detection device, comprising two main parts: a leak detection box 7 and a leak detection cover 6. The bottom inner ring of the leak detection cover 6 is embedded with a rubber ring, which cooperates with a corresponding rubber ring on the upper outer ring of the leak detection box 7 to achieve a sealed connection. The main body of the leak detection cover 6 is injection molded from transparent acrylic resin, and its internal space is divided into three functional layers from bottom to top: a positioning layer, a hollow layer 13, and a leak detection layer 9.

[0019] Positioning Layer: Located at the bottom, this layer is divided into multiple independent cells, each sized to fit the hydrogen cylinder 1 to be inspected, by crisscrossing high-temperature resistant partitions 11. The bottom of each cell is sealed by a sealing plate 4, which are interconnected. A sealing upper ring 5 is fixedly installed on each sealing plate 4 at the center of each cell, with a hollow groove at its center. The bottom of the sealing upper ring 5 has a groove. A sealing lower ring 2, corresponding to the position of the sealing upper ring 5, is located on the upper part of the hydrogen cylinder 1 to be inspected. The top of the sealing lower ring 2 has a protrusion that matches the aforementioned groove. When the cylinder 1 is placed within the cell, the interlocking of the protrusion and concave grooves creates a reliable sealing space around the cylinder opening. Below the sealing plates 4, several heating plates 3 are evenly arranged, and these heating plates 3 are electrically connected to a control plate located on the side of the leak detection cover 6.

[0020] Hollow layer 13: Located above the positioning layer, it is a relatively enclosed cavity. Multiple one-way valves 10 are installed inside the cavity. These one-way valves 10 are flexible one-way valves. Each cell in the positioning layer is connected to a one-way valve 10 at its top. The inlet of each one-way valve 10 is typically connected to the top of the cell via an arc-shaped groove to collect gas, while the outlet passes through the hollow layer 13 and connects to the leak detection layer 9 above. The one-way valves 10 prevent hydrogen backflow.

[0021] Leak detection layer 9: Located at the top, leak detection layer 9 itself is a sealed cavity except for the inlet of one-way valve 10. A hydrogen detection alarm 12 is installed on the top of leak detection layer 9, and the detection probes of the hydrogen detection alarm 12 are evenly distributed on the inner side wall of the top of leak detection layer 9.

[0022] The specific implementation principle is as follows: Multiple gas cylinders 1 to be tested are placed in the leak detection box 7, and the leak detection cover 6 is closed, ensuring that the sealing lower ring 2 of each gas cylinder is in a tight seal with the sealing upper ring 5 of the corresponding cell. If a gas cylinder leaks, hydrogen will accumulate in its corresponding cell, and the increased pressure will open the one-way valve 10 of that cell, entering the leak detection layer 9. After the hydrogen detector alarm 12 detects the hydrogen, it will sound an alarm. By observing which one-way valve is open and combining this with the alarm signal, the operator can quickly determine which gas cylinder is leaking. After the leak detection is completed, the heating plate 3 can be activated via the control panel to disperse the residual gas, preparing for the next leak detection.

[0023] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A high-pressure gaseous hydrogen cylinder leak detection device, comprising a leak detection box (7) and a leak detection cover (6), characterized in that, The leak detection cover (6) is divided into three layers from bottom to top: positioning layer, hollow layer (13) and leak detection layer (9). The positioning layer is divided into multiple cells that are compatible with the gas cylinder (1) by a high-temperature resistant partition (11). The bottom of the high-temperature resistant partition (11) is sealed by a sealing plate (4). The sealing plate (4) of the cell is provided with a sealing upper ring (5) in the middle. The side of the gas cylinder (1) is provided with a sealing lower ring (2) that is compatible with the sealing upper ring (5). Each cell has a one-way valve (10) that is compatible with it. The other side of the one-way valve (10) is connected to the leak detection layer (9). The top of the leak detection layer (9) is provided with a hydrogen detection alarm (12). The leak detection cover (6) is a transparent high-temperature resistant injection molded part.

2. The high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The leak detection cover (6) is made of acrylic resin.

3. The high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The bottom of the upper sealing ring (5) is provided with a groove, and the top of the lower sealing ring (2) is provided with a protrusion, the protrusion and the groove being compatible.

4. The high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The bottom inner ring of the leak detection cover (6) is equipped with a rubber ring that matches the rubber ring on the upper outer ring of the leak detection box (7).

5. A high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The leak detection layer (9) and the hollow layer (13) are sealed except for the one-way valve (10).

6. The high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The bottom of the sealing plate (4) is uniformly provided with heating plates (3), and the heating plates (3) are connected to the control plate on the upper side of the leak detection cover (6).

7. A high-pressure gaseous hydrogen cylinder leak detection device according to claim 1, characterized in that, The one-way valve (10) is connected to the arc-shaped groove at the top of the positioning layer.

Images