Tri-axial purging and draining arrangement structure in hydrogen fuel cell box body

Abstract

The invention discloses a triaxial purging drainage arrangement structure in a hydrogen fuel cell box body, and aims to solve the problems of incomplete hydrogen purging and insulation fault caused by liquid water in the existing hydrogen fuel cell box body. The structure comprises a box body, a stop valve, a three-axis connector assembly, a pressurization diffusion purging bamboo joint connector, a small axial flow fan, a drainage bamboo joint connector and a flow guide structure. The front side plate is provided with a stop valve as a purging inlet, a plurality of groups of three-axis joint assemblies are arranged in the box body to realize X-axis, Y-axis and Z-axis purging, and the rear side plate is provided with an axial flow fan which is diagonally arranged with the three-axis joint assemblies; the bottom plate is provided with a soil slope type convex arc flow guide structure, a slope flow guide ditch and a drainage groove, and the three sets of three-axis connector assemblies are arranged corresponding to the ditch and matched with blowing force and gravity to achieve flow guide and drainage of liquid water. Through diagonal arrangement of blowing and sucking, dead-corner-free blowing of hydrogen is achieved, liquid water is thoroughly discharged in combination with a multi-stage flow guide structure, hydrogen safety risks and insulation faults are effectively avoided, and practicability is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen fuel cell equipment, and particularly relates to a three-axis purging and draining arrangement structure in a hydrogen fuel cell box body, which is mainly applied to hydrogen purging and liquid water draining of a hydrogen fuel cell stack box body, and guarantees safe operation of the hydrogen fuel cell system. BACKGROUND

[0002] As a clean electrochemical energy conversion device, the core component "stack" of the hydrogen fuel cell is stacked by a bipolar plate and a membrane electrode to realize hydrogen-oxygen reaction and convert chemical energy into electrical energy under the action of a catalyst. Due to the characteristics of hydrogen, such as small density, strong penetration, flammability and explosiveness, slight hydrogen leakage may occur during the operation of the stack. If the accumulated hydrogen in the box body reaches the concentration threshold, a small spark or arc may cause a safety accident. Therefore, the stack is usually placed in a sealed explosion-proof box body, and the gas flow is realized through the purging inlet and outlet in the box body to avoid hydrogen accumulation.

[0003] At the same time, the box body is in a high-temperature and high-humidity environment during the operation of the stack, and the temperature decreases after shutdown. Gaseous water is easily condensed into liquid water droplets when it meets cold, and adheres to the inner wall of the box body, the surface of the stack and the copper bar (a positive and negative electrode current transmission component). Liquid water may conduct the copper bar and the box body or the parts in the box, causing the system insulation value to decrease below the threshold, triggering equipment error shutdown, electrical device short circuit damage, and even spark-induced hydrogen safety accidents. According to the feedback from hydrogen energy manufacturers, the main cause of system insulation failure is the accumulation of liquid water in the box body.

[0004] In the prior art, although some patents (such as CN115332584A) try to solve the problem of hydrogen purging, the air extractor is arranged on the upper cover of the box body, and the DC / DC controller is usually installed on the upper cover of the box body. There is a conflict between the air extractor and the controller in terms of arrangement, and there are dead angles in the purging range, which leads to incomplete purging of hydrogen. Another patent (such as CN119764510A) designs a water tank drainage structure, but only relying on the water tank cannot cover all areas of the bottom plate. The water droplets that are difficult to blow off on the bottom plate will still accumulate, and the problem of liquid water cannot be completely solved. In addition, the existing purging outlet is usually located above the box body, which can only drain a small amount of suspended gaseous water. The condensed liquid water cannot be drained through purging, and the closed box body leads to extremely low natural air drying efficiency. Even if the system is shut down for a month, there will still be liquid water remaining, which always threatens the safety of system insulation. SUMMARY

[0005] The present application aims to solve the following two core problems in view of the defects of the prior art: The accumulation of hydrogen in the hydrogen fuel cell box body due to purging dead angles leads to error shutdown of the hydrogen concentration sensor or causes safety accidents; Liquid water condensing inside the enclosure under high temperature and humidity conditions cannot be completely drained, which can cause the copper busbars to become connected to the enclosure / fuel stack, leading to decreased system insulation, damage to electrical components, or even safety accidents.

[0006] To achieve the above objectives, the present invention provides a triaxial purging and drainage arrangement structure inside a hydrogen fuel cell housing, comprising: The box body is assembled from the front box body side panel (1), the rear box body side panel (2), the left box body side panel (3), the right box body side panel (4) and the box body bottom panel (5); The shut-off valve (6) is located outside the front housing side plate (1) and serves as the inlet switch valve for the purging gas. The triaxial connector assembly includes at least a first triaxial connector assembly (X01), a second triaxial connector assembly (X02), and three sets of triaxial connector assemblies disposed on the bottom plate (5) of the housing. The first triaxial connector assembly (X01) is connected to the shut-off valve (6) to realize XYZ triaxial purging, with the Z axis connected to the next branch purging pipeline and the XY axes blowing air into the housing. The second triaxial connector assembly (X02) is connected to the first triaxial connector assembly (X01) above the Z axis and to the bottom plate triaxial connector assembly below the Z axis. The three sets of triaxial connector assemblies on the bottom plate are interconnected through the connecting pipeline (9) and connected to the second triaxial connector assembly (X02). A small axial flow fan (12) is located on the outside of the rear box side plate (2) and is arranged diagonally with the first and second three-axis joint assemblies. The rear box side plate (2) has corresponding round holes. When the fan is running, a negative pressure is formed on the back to draw gas from the box and the front is the gas outlet. An axial flow fan filter screen (13) is sandwiched between the fan and the rear box side plate (2). The bottom plate drainage structure includes a convex arc-shaped drainage structure (Y04), a sloping drainage ditch (Y02), and a drainage channel structure (Y03). The arc-shaped drainage structure guides water droplets into the ditch. The ditch and the drainage channel have a height difference, and the bottom plate has three sets of three-axis joint components corresponding to three ditches. The drainage channel has drainage holes, and drainage bamboo joints (10) are installed at the drainage holes. A drainage bamboo joint filter screen (11) is sandwiched between the drainage bamboo joint (10) and the bottom plate (5) of the box.

[0007] Furthermore, the triaxial connector assembly consists of a triaxial connector base (7) and a pressurized diffusion purge bamboo joint connector (8). The pressurized diffusion purge bamboo joint connector (8) is installed on the five mounting surfaces of the triaxial connector base (7) by threaded locking. The triaxial connector base (7) is provided with internal threads, and the bottom plate of the pressurized diffusion purge bamboo joint connector (8) is provided with external threads. The pressurized diffusion purge bamboo joint connector (8) is provided with a 45° angle pressurization chamber and a 30° angle diffusion chamber inside. The purge gas is first compressed and accelerated by the 45° angle pressurization chamber, and then diffused outward at a 30° angle through the 30° angle diffusion chamber.

[0008] Furthermore, the inner walls of the left box side panel (3), the right box side panel (4) and the rear box side panel (2) are all provided with concave arc-shaped flow guiding structures (Y01). The concave arc-shaped flow guiding structures (Y01) are used to reduce the adhesion of water droplets condensed on the side panels and guide the water droplets to slide down to the box bottom plate (5).

[0009] Furthermore, the convex arc-shaped flow guiding structure (Y04) of the earth slope is a continuous convex arc-shaped surface, and the tilt direction of the continuous convex arc-shaped surface is towards the slope flow guiding ditch (Y02).

[0010] Furthermore, a silicone tube is connected to the tail of the drainage bamboo joint (10), which is used to adjust the final position of the box drainage.

[0011] Furthermore, the purge inlet diameter of the shut-off valve (6) is the same as the purge inlet diameter of the subsequent branch. This is to double the gas flow rate required for multi-branch purging.

[0012] Furthermore, the circular hole on the rear box side plate (2) is adapted to the suction port of the small axial flow fan (12) to ensure that the fan can efficiently suck up the gas in the box when it is running.

[0013] Furthermore, the face of the triaxial connector base (7) does not need to be installed with the pressurized diffusion purging bamboo joint connector (8), and is sealed by a threaded plug to prevent purging gas leakage.

[0014] Furthermore, the length of the 30° angle diffusion chamber is greater than the length of the 45° angle pressurization chamber to ensure that the purging gas can diffuse sufficiently and cover a larger purging range.

[0015] Furthermore, both the axial flow fan filter (13) and the drainage bamboo joint filter (11) are metal filter screens with a pore size of no more than 0.1 mm, used to block large external dust particles from entering the housing.

[0016] The beneficial effects of this invention are: Hydrogen purging dead angle: by diagonal blowing and suction, that is, three-axis joint assembly blowing and axial flow fan suction, and three-axis purging design, covering all areas of the box, completely solving the problem of incomplete hydrogen purging in the prior art, avoiding safety accidents and equipment downtime caused by hydrogen concentration exceeding the standard; High purging efficiency: the 45° booster cavity and 30° diffusion cavity design of the booster diffusion purging bamboo joint increase the flow rate of purging gas, expand the coverage range, enhance the gas flowability in the box, and further improve the hydrogen discharge efficiency; Complete liquid water discharge: the side plate concave arc flow guide structure guides the water droplets to slide off, the bottom plate soil slope flow guide, combined with the high-low difference of the ditch and drainage groove and the purging force synergistic effect, completely discharges the liquid water accumulated on the bottom plate, solves the deficiency of the existing water tank drainage structure, and avoids the insulation failure caused by liquid water; Dust protection: the design of the axial flow fan filter screen and the drainage bamboo filter screen prevents external dust from entering the box, ensures the cleanliness of the internal components of the box, and prolongs the service life of the equipment; Reasonable arrangement: the axial flow fan is arranged on the side plate instead of the upper cover, avoiding the installation space of the upper cover DC / DC controller, solving the arrangement conflict problem of the prior art, adapting to the mainstream assembly design of the existing fuel cell box, and having strong practicality. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Figure 1 is a schematic diagram of the internal structure of the hydrogen fuel cell box of the present application; Figure 2 Figure 2 is a schematic diagram of the internal structure of the hydrogen fuel cell box of the present application; Figure 3 Figure 3 is a schematic diagram of the internal structure of the hydrogen fuel cell box of the present application; Figure 4 Figure 4 is a top view of the internal structure of the hydrogen fuel cell box of the present application; Figure 5 Figure 5 is Figure 4 Figure 6 is Figure 6 Figure 7 is Figure 4 Figure 8 is Figure 7 Figure 9 is the 2D view and cross-sectional view C-C of the booster diffusion purging bamboo joint.

[0018] Reference signs: 1 - front tank side plate; 2 - rear tank side plate; 3 - left tank side plate; 4 - right tank side plate; 5 - tank bottom plate; 6 - stop valve; 7 - three-axis joint base; 8 - pressure diffusion purging bamboo joint; 9 - connecting pipeline; 10 - drainage bamboo joint; 11 - drainage bamboo joint filter screen; 12 - small axial flow fan; 13 - axial flow fan filter screen; X01 - first three-axis joint assembly; X02 - second three-axis joint assembly; Y01 - concave arc surface flow guide structure; Y02 - slope flow guide trench structure; Y03 - drainage groove structure; Y04 - soil slope convex arc surface flow guide structure. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described in detail below in combination with the drawings of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0020] The embodiments mentioned in the present application mean that the specific features, structures or characteristics described in combination with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0021] As Figures 1-4 shown, the present embodiment provides a hydrogen fuel cell tank internal purging and drainage arrangement scheme, which aims to solve the problem that the accumulation of hydrogen gas in the hydrogen fuel cell tank cannot be purged completely, so that the high hydrogen concentration leads to error shutdown of the hydrogen concentration sensor or safety accidents, and the liquid water generated in the high temperature and high humidity environment in the tank will lead to the copper bar and the tank or reduce the creepage distance of the copper bar and the tank and other parts, resulting in the problem of system insulation decline.

[0022] 1, overall structure composition The structure includes a tank (front side plate 1, rear side plate 2, left side plate 3, right side plate 4, bottom plate 5), a stop valve 6, a three-axis joint assembly (X01, X02 and three sets of bottom plate assemblies), a pressure diffusion purging bamboo joint 8, a connecting pipeline 9, a drainage bamboo joint 10, a drainage bamboo joint filter screen 11, a small axial flow fan 12, an axial flow fan filter screen 13, and a side plate concave arc flow guide structure Y01, a bottom plate soil slope convex arc flow guide structure Y04, a slope flow guide trench Y02, and a drainage groove structure Y03.

[0023] 2, purging gas control and transmission A shut-off valve 6 is mounted externally on the front side plate 1, serving as a purge inlet switch valve to control the purge timing according to the fuel cell's operating status; the purge inlet orifice is designed to be the branch purge port diameter. This ensures that the gas flow rate meets the purging requirements of multiple branches.

[0024] The purge gas enters the first triaxial connector assembly X01 through the shut-off valve 6. X01 performs triaxial purging in the upper part of the housing: the Z-axis connects to the next branch pipe (connecting to the second triaxial connector assembly X02), and the X and Y axes blow gas into the housing, guiding the gas to flow in diagonal directions; the bottom plate is connected to three sets of triaxial connector assemblies below the Z-axis of X02. Each set of assemblies achieves gas transmission through the connecting pipe 9, ensuring the purging coverage of the bottom plate area.

[0025] 3. Pressurized diffusion purging design The triaxial connector assembly consists of a triaxial connector base 7 and a pressurized diffusion purge bamboo-joint connector 8: the bamboo-joint connector 8 can be threaded and locked onto the five sides of the base 7 (no need to seal the mounting surfaces with threaded plugs); such as Figure 7 As shown, the bamboo joint 8 has a 45° angle pressurization chamber and a 30° angle long diffusion chamber inside. The gas is first compressed and accelerated in the pressurization chamber, and then diffused outward at a 30° angle through the diffusion chamber, which significantly improves the flow rate and coverage of the purging gas and enhances the gas flow in the box.

[0026] 4. Diagonal suction and exhaust design A small axial flow fan 12 is installed on the upper exterior of the rear side panel 2, and is arranged diagonally with the first and second triaxial joint assemblies (X01, X02). The rear side panel 2 has a round hole corresponding to the fan position. When the fan is running, a negative pressure is formed on the back, which draws in the gas in the box and discharges it from the front. This forms a blowing and sucking airflow circulation with the blowing of X01 and X02, realizing a full-coverage blowing and cleaning of the box without dead corners, and completely solving the problem of hydrogen accumulation. The axial flow fan filter 13 between the fan and the rear side panel 2 can prevent external dust from entering the box when the machine is stopped.

[0027] 5. Liquid water diversion and drainage design See the instruction manual appendix Figures 4-5Side plate drainage: The inner walls of the left side plate 3, right side plate 4, and rear side plate 2 are equipped with concave arc-shaped drainage structures Y01 to reduce water droplet adhesion on the side plates. Even if water droplets adhere, they can quickly slide down the arc surface to the bottom plate 5. Bottom plate drainage: The bottom plate 5 is equipped with a slope-type convex arc-shaped drainage structure Y04 to guide water droplets that are difficult to blow away on the bottom plate into the sloping drainage ditch Y02. There is a height difference between Y02 and the drainage ditch Y03. Combined with the blowing force of the three sets of three-axis joint components of the bottom plate, the liquid water in Y02 is pushed into the drainage ditch Y03. A drainage bamboo joint joint 10 is installed at the drainage hole of the drainage ditch Y03. The end of the joint can be connected to a silicone tube to adjust the drainage position. The drainage bamboo joint filter screen 11 between the joint and the bottom plate 5 can prevent external dust from entering the box, and finally achieve complete drainage of liquid water to avoid insulation failure.

[0028] I. Component Preparation and Installation The enclosure is assembled using aluminum alloy sheets, including front panel 1, rear panel 2, left panel 3, right panel 4 and bottom panel 5. The sheets are connected and fixed with bolts to ensure the enclosure is sealed. Installation of the shut-off valve: A mounting hole is made on the outside of the front side plate 1. The shut-off valve 6 is fixed to the mounting hole through a flange connection. The inlet of the shut-off valve 6 is connected to an external purge air source, and the outlet is connected to the first triaxial connector assembly X01 through a pipeline. The purge inlet diameter of the shut-off valve 6 is set to 20mm (if the branch purge port diameter is 14mm, it satisfies the √2 ratio). Triaxial connector assembly installation: A bracket for fixing the first triaxial connector assembly X01 is welded to the upper side of the housing, and X01 is installed on the bracket with bolts; the Z-axis outlet of X01 is connected to the Z-axis inlet of the second triaxial connector assembly X02 through a silicone tube (connecting pipe 9), and X02 is fixed in the middle of the housing by the bracket; Three sets of brackets are welded on the base plate 5, and three sets of triaxial connector assemblies are installed on them respectively. Each set of assemblies is connected to each other through silicone tubes (connecting pipes 9), and the Z-axis inlet of one set of assemblies is connected to the Z-axis outlet of X02 through silicone tubes. The triaxial connector base 7 of the triaxial connector assembly is provided with an internal thread (M16), and the base plate of the pressurized diffusion purging bamboo joint connector 8 is provided with an external thread (M16). The bamboo joint connector 8 is installed in the XY axis direction of the base 7, and the Z axis is used to connect branches. The surface of the base 7 where the bamboo joint connector is not installed is sealed with an M16 threaded plug. Axial flow fan installation: A φ150mm circular hole is made on the upper outer side of the rear panel 2. The axial flow fan filter screen 13, a metal filter screen with a 0.1mm aperture, is fixed to the inside of the circular hole using sealant. Then, the small axial flow fan 12 (model: FA-40, air volume 120m³ / h) is installed. 3 / h) is fixed to the outside of the rear side plate 2 by bolts to ensure that the suction port of the fan is aligned with the round hole, and the fan is arranged diagonally with X01 and X02, such as X01 being on the upper inside of the front side plate 1 and the fan being on the upper outside of the rear side plate 2. Installation of diversion and drainage structures: A concave arc-shaped flow guide structure Y01 is formed on the inner wall of the left side plate 3, the right side plate 4, and the rear side plate 2 by stamping process. The arc radius is set to 50mm and the arc direction is towards the bottom plate 5. On the base plate 5, a soil slope-type convex arc-shaped flow guide structure Y04 with an arc radius of 80mm and an inclination angle of 5° is formed by casting; Y02 with a depth of 10mm, a width of 20mm, and an inclination angle of 3°; and a drainage trough Y03 with a depth of 15mm and a width of 30mm are formed. Ensure that the inclination direction of Y04 is towards Y02, and the lower end of Y02 is connected to Y03 with a height difference of 5mm. Three φ10mm drainage holes are made on the drainage channel Y03. A drainage bamboo joint connector 10 is installed at each drainage hole by threaded connection. A drainage bamboo joint filter screen 11 with a 0.1mm hole diameter is sandwiched between the drainage bamboo joint connector 10 and the bottom plate 5. The end of the connector is connected to a φ12mm silicone tube, which extends to the designated drainage area outside the box.

[0029] II. Work Process Hydrogen purging: When the hydrogen fuel cell is running or needs purging, the shut-off valve 6 is opened, and external purging gas (such as dry air) enters the first triaxial connector assembly X01 through the shut-off valve 6. The XY axis of X01 blows gas into the box through the pressurized diffusion purging bamboo joint connector 8. After being accelerated by the 45° pressurization chamber, the gas is diffused and ejected at a 30° angle. The Z axis transmits the gas to the second triaxial connector assembly X02 through the connecting pipe 9. The XY axis of X02 also blows gas into the box, and the Z axis transmits the gas to the three sets of triaxial connector assemblies on the bottom plate 5. Each set of assemblies blows gas into the bottom plate area. At the same time, the small axial flow fan 12 is started, and a negative pressure is formed on the back of the fan, which draws in the gas (including leaked hydrogen) in the box and discharges it from the front, forming a diagonal blowing and sucking airflow circulation that covers all areas of the box and completely discharges the hydrogen. Liquid water discharge: In the high temperature and high humidity environment inside the chamber, gaseous water condenses into water droplets upon cooling. Water droplets attached to the left side plate 3, right side plate 4, and rear side plate 2 slide down to the bottom plate 5 along the concave arc-shaped guide structure Y01. Some of the water droplets on the base plate 5 are blown directly towards the slope diversion ditch Y02 by the purging gas of the three-axis joint assembly, while the other part slides into Y02 along the earth slope convex arc diversion structure Y04. Under the influence of purging force and height difference, the liquid water in Y02 flows into the drainage tank Y03, and is finally discharged outside the box through the drainage hole, drainage bamboo joint 10 and silicone tube, thus achieving complete removal of liquid water.

[0030] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A triaxial purging and drainage arrangement structure inside a hydrogen fuel cell housing, characterized in that, include: The box body is assembled from the front box body side panel (1), the rear box body side panel (2), the left box body side panel (3), the right box body side panel (4) and the box body bottom panel (5); The shut-off valve (6) is located outside the front housing side plate (1) and serves as the inlet switch valve for the purging gas. The triaxial connector assembly includes at least a first triaxial connector assembly (X01), a second triaxial connector assembly (X02), and three sets of triaxial connector assemblies disposed on the bottom plate (5) of the housing. The first triaxial connector assembly (X01) is connected to the shut-off valve (6) to realize XYZ triaxial purging and the Z-axis is connected to the next branch purging pipeline, and the XY axes blow air into the housing. The second triaxial connector assembly (X02) is connected to the first triaxial connector assembly (X01) above the Z-axis and to the bottom plate triaxial connector assembly below. The three sets of triaxial connector assemblies on the bottom plate are interconnected through the connecting pipeline (9) and connected to the second triaxial connector assembly (X02). A small axial flow fan (12) is located on the outside of the rear box side plate (2) and is arranged diagonally with the first and second three-axis joint assemblies. The rear box side plate (2) has corresponding round holes. When the fan is running, a negative pressure is formed on the back to draw gas from the box, and the front is the gas outlet. An axial flow fan filter screen (13) is sandwiched between the fan and the rear box side plate (2). The bottom plate drainage structure includes a convex arc-shaped drainage structure (Y04), a sloping drainage ditch (Y02), and a drainage channel structure (Y03). The arc-shaped drainage structure guides water droplets into the ditch. The ditch and the drainage channel have a height difference, and the bottom plate has three sets of three-axis joint components corresponding to three ditches. The drainage channel has drainage holes, and drainage bamboo joints (10) are installed at the drainage holes. A drainage bamboo joint filter screen (11) is sandwiched between the drainage bamboo joint (10) and the bottom plate (5) of the box.

2. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The triaxial connector assembly consists of a triaxial connector base (7) and a pressurized diffusion purge bamboo joint connector (8). The pressurized diffusion purge bamboo joint connector (8) is installed on the five mounting surfaces of the triaxial connector base (7) by threaded locking. The triaxial connector base (7) is provided with internal threads, and the bottom plate of the pressurized diffusion purge bamboo joint connector (8) is provided with external threads. The pressurized diffusion purge bamboo joint connector (8) is provided with a 45° angle pressurization chamber and a 30° angle diffusion chamber inside. The purge gas is first compressed and accelerated by the 45° angle pressurization chamber, and then diffused outward at a 30° angle through the 30° angle diffusion chamber.

3. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The inner walls of the left box side panel (3), the right box side panel (4) and the rear box side panel (2) are all provided with concave arc-shaped flow guiding structures (Y01). The concave arc-shaped flow guiding structures (Y01) are used to reduce the adhesion of water droplets condensed on the side panels and guide the water droplets to slide down to the box bottom plate (5).

4. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The convex arc-shaped flow guiding structure (Y04) of the earth slope is a continuous convex arc-shaped surface, and the tilt direction of the continuous convex arc-shaped surface is towards the slope flow guiding ditch (Y02).

5. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The tail end of the drainage bamboo joint (10) is connected to a silicone tube, which is used to adjust the final position of the drainage of the box.

6. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The purge inlet diameter of the shut-off valve (6) is the same as the purge inlet diameter of the subsequent branch. This is to double the gas flow rate required for multi-branch purging.

7. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, The circular hole on the rear box side plate (2) is adapted to the suction port of the small axial flow fan (12) to ensure that the fan can efficiently suck up the gas in the box when it is running.

8. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 2, characterized in that, The surface of the triaxial connector base (7) does not require the installation of the pressurized diffusion purging bamboo joint connector (8). It is sealed by a threaded plug to prevent purging gas leakage.

9. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 2, characterized in that, The length of the 30° angle diffusion chamber is greater than the length of the 45° angle pressurization chamber to ensure that the purging gas can diffuse fully and cover a larger purging range.

10. The triaxial purging and drainage arrangement structure inside the hydrogen fuel cell housing according to claim 1, characterized in that, Both the axial flow fan filter (13) and the drainage bamboo joint filter (11) are metal filter screens with a pore size of no more than 0.1 mm, used to block large particles of dust from entering the housing.

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