Cleaning structure for inner wall of gas cylinder

Abstract

The invention discloses a cleaning structure for the inner wall of a gas cylinder, and relates to the field of hydrogen energy automobiles, and the cleaning structure comprises a gas cylinder placing rack and a liquid spraying and recycling tool. The gas cylinder placing rack can vertically fix a gas cylinder with a downward opening, the upper end and the lower end of the gas cylinder placing rack are provided with annular gas cylinder enclosures which can be laterally opened, the lower end is provided with a bearing baffle, and the bottom is provided with moving wheels; the liquid spraying and recycling tool is detachably connected to a bottle opening of the gas bottle and comprises a spraying pipeline which extends into the bottle and is provided with a rotary spraying head at the end part, a liquid recycling pipeline for recycling liquid and an air filtering pipe of which one end extends into the bottle and the other end is connected with a filter so as to adjust the pressure in the bottle. The structure is high in integration degree, the cleaning efficiency and the detection accuracy can be improved, the cost is reduced, and the device is suitable for cleaning the vehicle-mounted hydrogen storage cylinder.

Description

Technical Field

[0001] This invention patent belongs to the field of hydrogen energy vehicles and is a cleaning structure for the inner wall of a gas cylinder. Background Art

[0002] In recent years, with the development of electric vehicles, hydrogen fuel cell vehicles have achieved significant breakthroughs, and various hydrogen fuel cell vehicles have entered commercial production and operation. In the hydrogen fuel cell systems installed in these vehicles, the stable output of hydrogen flow and pressure is a critical component to ensure the efficient and stable operation of the fuel cell system.

[0003] Gas cylinders are the most commonly used hydrogen storage components in on-board hydrogen systems. During use, hydrogen fuel cell vehicles (FCVs) generate electricity through various precision components, including the cylinder valve, piping, pressure reducing valve, and fuel cell stack. A poorly maintained hydrogen cylinder storage environment increases the risk of failure of various components in the hydrogen system, increasing maintenance costs. This invention addresses this issue by employing a cleaning structure for the inner wall of the gas cylinder, effectively resolving this issue and representing a novel technology. Summary of the Invention

[0004] The technical problem to be solved by the patent of this invention is to provide a cleaning structure for the inner wall of a gas cylinder, which is a brand-new technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a cleaning structure for the inner wall of a gas cylinder, characterized by comprising a gas cylinder placement rack and a liquid spray recovery tool; The gas cylinder placement rack is used to place gas cylinders vertically with the bottle mouth facing downwards. The upper and lower ends of the gas cylinder placement rack are respectively provided with gas cylinder enclosures that can be opened laterally. One side of the gas cylinder enclosure is connected by a hinge and the other side is provided with a lock. The lower end of the gas cylinder placement rack is provided with a load-bearing baffle for supporting the gas cylinder, and the bottle mouth of the gas cylinder can pass through the load-bearing baffle. The bottom of the gas cylinder placement rack is also provided with movable wheels; The liquid spray recovery tooling is detachably connected to the bottle mouth of the gas cylinder. The liquid spray recovery tooling includes a spray pipeline, a liquid recovery pipeline and an air filter tube. The spray pipeline extends into the interior of the gas cylinder and is provided with a rotating nozzle at the end. The liquid recovery pipeline recovers the liquid in the gas cylinder through the liquid recovery port. One end of the air filter tube extends into the interior of the gas cylinder and the other end is connected to a filter to adjust the pressure in the gas cylinder.

[0006] Preferably, the gas cylinder enclosure is an annular structure, and the inner diameter of the annular structure is larger than the outer diameter of the gas cylinder.

[0007] Preferably, the opening diameter of the load-bearing baffle is smaller than the diameter of the gas cylinder body.

[0008] Preferably, the spray pipeline is made of polytetrafluoroethylene, and the axis of the spray hole of the rotating nozzle forms an angle of 30° with the radial direction of the nozzle, driving the nozzle to rotate when the liquid is sprayed.

[0009] Preferably, the liquid recovery pipeline is also connected to a liquid storage tank.

[0010] Preferably, a manual valve is provided on the air filter tube, and the air filter tube can control the air supply volume through the manual valve, and has an auxiliary air supply function. Preferably, the filter is a HEPA-grade filter element, and the filtration accuracy of the HEPA-grade filter element is 0.3 μm.

[0011] Preferably, the load-bearing baffle is made of 304 stainless steel.

[0012] The beneficial effects of the present invention are as follows: 1. This invention breaks through the limitations of the traditional discrete design of "fixing, spraying, recovery, and pressure regulation" in gas cylinder cleanliness testing, and pioneers an integrated cleaning structure. Through the collaborative design of the gas cylinder placement rack and the liquid spray recovery tooling, it integrates the functions of gas cylinder fixing, inner wall spraying, liquid recovery, and pressure balancing into an organic whole, forming a dedicated technical solution for gas cylinder inner wall cleanliness testing, filling the gap in the industry's lack of dedicated testing auxiliary structures.

[0013] 2. The gas cylinder rack of the present invention adopts a side-openable enclosure design, and with the bottom rollers, it can quickly complete the side lifting and overall movement of the gas cylinder, which improves the loading and unloading efficiency compared with the traditional manual handling and fixing method; the rotating nozzle at the end of the spray pipe can flush the inner wall of the gas cylinder 360° without dead angles, and the coverage range far exceeds that of manual handheld spray or local observation with an endoscope. A single spray can complete the preparation for the entire inner wall inspection, greatly shortening the pre-treatment time before inspection; the entire process from gas cylinder fixing to liquid spraying and recovery does not require frequent equipment replacement, reducing the operation links, and can save time and cost compared with the cleanliness inspection of a single gas cylinder.

[0014] 3. The HEPA-grade filtration design of the air filter effectively isolates dust and impurities from the external air from entering the gas cylinder during the test process, preventing external contamination from interfering with the test results and improving the accuracy of impurity detection. The air filter can adjust the pressure in the gas cylinder in real time to keep it consistent with atmospheric pressure, avoiding liquid splashing, gas cylinder deformation, or changes in the position of impurity attachment caused by pressure imbalance, ensuring that the test liquid can fully flush and remove impurities on the inner wall, reducing detection blind spots.

[0015] 4. The braked rollers at the bottom of the cylinder rack allow the device to be easily moved to different work areas. The upper and lower enclosures can be adjusted according to the specifications of the cylinders (by replacing enclosures with different inner diameters), adapting to a variety of common specifications of on-board hydrogen storage cylinders (such as 28L to 385L, etc.), and having a wide range of applications.

[0016] 5. The liquid spray recovery tooling connects quickly to the gas cylinder mouth via threads, and each pipeline uses a quick-connect connector design. Operators can complete the entire inspection process after simple training, reducing reliance on professional skills and facilitating widespread application in production workshops, maintenance sites, and other scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the planar structure of the liquid spray recovery tooling; Figure 2 This is a three-dimensional diagram of the liquid spray recovery tooling; Figure 3 It is a schematic diagram of the partial structure of the cleaning structure of the inner wall of the bottle; Figure 4 This is a top view of the liquid spray recovery tooling; Figure 5 This is a partial diagram of the air filter pipeline Figure 1 ; Figure 6 This is a partial diagram of the air filter pipeline Figure 2 ; Figure 7 It is a partial three-dimensional diagram of the cleaning structure of the inner wall of the gas cylinder.

[0019] 1—Spray pipeline; 2—Spray joint; 3—Liquid recovery pipeline; 4—Air filter pipeline; 5—Tooling interface; 6—Air recovery pipeline; 7—Rotary nozzle; 8—Liquid recovery port; 9—Gas cylinder; 10—Gas cylinder enclosure; 11—Gas cylinder base; 12—Filter; 13—Filter screen; 14—Liquid recovery pipeline; 15—Liquid storage tank; 16—Load-bearing baffle; 17—Manual valve; 18—Moving wheel; 19—Liquid delivery pipe. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] Example 1: The invention patent is further described in detail below with reference to the accompanying drawings and examples.

[0022] The patent of the present invention is a cleaning structure for the inner wall of a gas cylinder, including a gas cylinder placement rack, which includes gas cylinder enclosures 10 arranged at the upper and lower ends of the gas cylinder 9 to prevent the gas cylinder 9 from tipping over, and the cylinder enclosures 10 can be opened laterally to make it easier to place the gas cylinder 9. The load-bearing baffle 16 located below the gas cylinder 9 has a hole in the middle of the load-bearing baffle 16, and the mouth of the gas cylinder 9 can pass through the hole on the load-bearing baffle 16 to position and bear the weight of the gas cylinder 9. Moving wheels 18 are designed at the four corners of the gas cylinder placement rack so that the gas cylinder placement rack can be easily moved horizontally. Inspection tooling ( Figure 2 ), which includes: a spray line 1, the inlet end of the spray line 1 is connected to a liquid storage tank 15, the outlet end of the spray line 1 extends into the interior of the gas cylinder 9, and a booster pump is installed on the spray line 1, through which a test liquid can be injected into the interior of the gas cylinder 9, and a rotating nozzle 7 is designed at the outlet end of the spray line 1, so that the test liquid transported through the spray line 1 flushes the inner wall of the gas cylinder 9 in a divergent shape. A liquid recovery line 14, one end of the liquid recovery line 14 is connected to the gas cylinder 9, and the other end of the liquid recovery line 14 is connected to the liquid storage tank 15, and a self-priming pump is installed on the liquid recovery line 14. When the test liquid in the gas cylinder 9 falls back, it accumulates at the outlet of the gas cylinder 9, and the accumulated test liquid is pumped back to the liquid storage tank 15 by the self-priming pump. Air filter line 4, one end of the air filter line 4 extends into the gas cylinder 9, and the other end of the air filter line 4 is connected to the filter 12. Its function is to ensure that the internal pressure of the gas cylinder 9 is consistent with the atmospheric pressure during the process of the equipment spraying and extracting the detection liquid, thereby preventing the existence of a pressure difference inside the gas cylinder 9.

[0023] In order to ensure that the opening of the gas cylinder 9 is sealed, a plug can be installed on the spray joint 2, the liquid recovery pipeline 3, and the air filter pipeline 4. At this time, the inlet end of the liquid recovery pipeline 3 is flush with the inner side of the plug, so that the spray joint 2, the liquid recovery pipeline 3, and the air filter pipeline 4 are fixed together. It can also be used to block the opening of the gas cylinder 9 when the gas cylinder 9 is cleaned, thereby preventing the detection liquid in the gas cylinder 9 from leaking out. Of course, the plug is fixed in position on the gas cylinder placement rack. When the gas cylinder 9 is placed on the load-bearing baffle 16, the plug is inserted into the opening of the gas cylinder 9 to seal the opening of the gas cylinder 9.

[0024] Example 2: Cleanliness test of a small vehicle-mounted hydrogen cylinder 9 (20L) Step 1: Place and secure the gas cylinder 9. For a 28L small gas cylinder (20cm in diameter, 80cm in height), select a suitable gas cylinder rack: adjust the inner diameter of the gas cylinder enclosure 10 to 22cm to ensure that there is no interference when the gas cylinder 9 is hoisted sideways.

[0025] Step 2: Open the cylinder enclosure 10 and hoist the cylinder 9 from the side onto the load-bearing baffle 16, with the cylinder 9 mouth facing downward through the load-bearing baffle 16. Close the cylinder enclosure 10 and lock it. Use the movable wheels 18 at the bottom of the cylinder rack to push the cylinder rack to the inspection station, then lock the brakes on the movable wheels 18 to secure the cylinder rack.

[0026] Step 3: Install the liquid spray recovery tooling. Use the short spray line 1 (50 cm long) and ensure that the nozzle is 10 cm from the bottom of the gas cylinder 9 after it is inserted into the interior of the gas cylinder 9. Thread the top interface of the liquid spray recovery tooling into the top of the gas cylinder 9 and tighten to the required torque to ensure a good seal.

[0027] Step 4: Connect the pipelines. Connect the spray pipeline 1 to the booster pump (working pressure 0.5MPa), the liquid recovery pipeline 3 to the self-priming pump (power 50W), and the air filter pipeline 4 to the HEPA filter 12.

[0028] Step 5: Testing process, spraying stage: Turn on the booster pump and spray the test liquid (AP760) through the rotating nozzle 7 (speed 120r / min) for 3 minutes to ensure that the inner wall of the gas cylinder 9 is fully moistened and flushed.

[0029] Step 6: Recovery stage: turn off the booster pump and turn on the self-priming pump to complete liquid recovery within 5 minutes.

[0030] Step 7: Pressure regulation: The pressure inside the bottle is kept consistent with the atmospheric pressure through the filter 12 and the manual valve 7 to prevent the small gas cylinder 9 from being deformed due to pressure fluctuations.

[0031] Example 3: Cleanliness test of large-capacity gas cylinder 9 (385L) Step 1: Adjust the gas cylinder rack and replace the annular structure of the gas cylinder enclosure 10 to accommodate 385L gas cylinders 9. The opening diameter of the load-bearing baffle 16 is 100 cm to ensure that the bottle mouth can pass through stably.

[0032] Step 2: Use a forklift to lift the cylinder 9 sideways, place it on the cylinder rack, and check the load-bearing status of the lock of the load-bearing baffle 16 (ensure that the load-bearing capacity of a single lock is ≥ 50 kg).

[0033] Step 3: Adjust the tooling parameters. Use a 120cm long high-pressure pipe (with a pressure resistance of 1MPa) for the spray pipe 1. Increase the diameter of the spray hole of the rotating nozzle 7 to 1mm to ensure that the liquid covers the deep inner wall of the gas cylinder 9.

[0034] Step 4: The diameter of the inlet end of the liquid recovery pipeline 14 is expanded to 20 cm to match the falling speed of the large-capacity liquid; the power of the self-priming pump is adjusted to 150W to shorten the recovery time.

[0035] Step 5: Testing operation, the spraying time is extended to 12 minutes, and the rotation speed of the rotating nozzle 7 is maintained at 120r / min to ensure that the liquid fully contacts the inner wall.

[0036] Step 6: During the recovery phase, the auxiliary air supply function of the air filter line 4 is turned on to accelerate the falling and gathering of the liquid, and the recovery is completed within 8 minutes (recovery rate ≥ 94%).

[0037] Step 7: The test liquid is reused after three-stage filtration (with an additional 5μm precision pre-filter), which is suitable for multiple testing needs of large-capacity gas cylinders 9.

[0038] The above embodiments show that the present invention can meet the cleanliness detection requirements of gas cylinders 9 of different specifications through structural adaptability adjustment, reflecting the versatility and practicality of the equipment, and further verifying its advantages in improving efficiency, reducing costs and ensuring accuracy.

[0039] Working principle: Place the gas cylinder 9 vertically on the gas cylinder placement rack with the bottle mouth facing downward, fix it with the gas cylinder enclosures 10 at the upper and lower ends of the gas cylinder placement rack, and use the moving wheels 18 at the bottom of the gas cylinder placement rack to achieve overall movement; the liquid spray recovery tooling is connected to the bottle mouth of the gas cylinder, wherein the spray pipe 1 is extended into the interior of the gas cylinder 9, and the liquid is sprayed on the inner wall of the gas cylinder 9 through the rotating nozzle 7 at the inlet end of the spray pipe 1. After the liquid falls and gathers on the inner wall of the gas cylinder 9, it is recovered through the liquid recovery pipe 14. At the same time, the air filter pipe 4 is extended into the bottle and connected to the external filter 12 to adjust the pressure in the gas cylinder 9 to be consistent with the atmospheric pressure, thereby completing the spraying, recovery and pressure balance operations related to the cleanliness detection of the inner wall of the gas cylinder 9.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A cleaning structure for the inner wall of a gas cylinder, characterized in that: Including gas cylinder rack and liquid spray recovery tooling; The gas cylinder placement rack is used to vertically place gas cylinders (9) with the bottle mouth facing downwards, and the upper and lower ends of the gas cylinder placement rack are respectively provided with gas cylinder enclosures (10) that can be opened laterally, one side of the gas cylinder enclosure (10) is connected by a hinge and the other side is provided with a lock, the lower end of the gas cylinder placement rack is provided with a load-bearing baffle (16) for supporting the gas cylinder (9), the bottle mouth of the gas cylinder (9) can pass through the load-bearing baffle (16), and the bottom of the gas cylinder placement rack is provided with a moving wheel (18); The liquid spray recovery tool is detachably connected to the bottle mouth of the gas cylinder (9), and the liquid spray recovery tool comprises a spray pipeline (1), a liquid recovery pipeline (3) and an air filter tube (4). The spray pipeline (1) extends into the interior of the gas cylinder and is provided with a rotating nozzle (7) at the end thereof. The liquid recovery pipeline recovers the liquid in the gas cylinder through the liquid recovery port (8). One end of the air filter tube (4) extends into the interior of the gas cylinder and the other end is connected to a filter (12) to adjust the pressure in the gas cylinder.

2. The cleaning structure according to claim 1, characterized in that: The gas cylinder enclosure (10) is an annular structure, and the inner diameter of the annular structure is larger than the outer diameter of the gas cylinder.

3. The cleaning structure according to claim 1, characterized in that: The opening diameter of the load-bearing baffle (16) is smaller than the body diameter of the gas cylinder (9).

4. The cleaning structure according to claim 1, characterized in that: The spray pipe (1) is made of polytetrafluoroethylene, and the axis of the spray hole forms an angle of 30° with the radial direction of the spray head.

5. The cleaning structure according to claim 1, characterized in that: The liquid recovery pipeline (3) is also connected to a liquid storage tank (15).

6. The cleaning structure according to claim 1, characterized in that: The air filter tube (4) is provided with a manual valve (17).

7. The cleaning structure according to claim 1, characterized in that: The filter (12) is a HEPA-grade filter element, and the filtration accuracy of the HEPA-grade filter element is 0.3 μm.

8. The cleaning structure according to claim 1, characterized in that: The load-bearing baffle (16) is made of 304 stainless steel.

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