A hydrogen fuel cell air tightness detection device

Abstract

The application discloses a kind of hydrogen fuel cell air tightness detection equipment, including base, first storage plate and second storage plate, the top of the base is connected with shell, and the top of shell is equipped with equipment groove inside, and buzzer is installed in the front side of shell.The hydrogen fuel cell air tightness detection equipment, when motor drives first lead screw to rotate, first sliding seat will drive first storage plate and its top to complete the hydrogen fuel cell of detection to move down and away from sealing cover, while second lead screw will rotate with first lead screw under the linkage of belt transmission structure, so that second sliding seat drives second storage plate and hydrogen fuel cell to be detected above it to move up, on the other hand, motor drives sealing cover to rotate through switching cylinder to continue detection work, at the same time, workers can replace workpiece on first storage plate, so as to realize automatic switching of feeding and discharging, and there will be no phenomenon of detection component stop, and thus improve the continuity of detection, while improving detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of hydrogen fuel cell testing technology, specifically to a hydrogen fuel cell air tightness testing device. Background Technology

[0002] A hydrogen fuel cell is a battery that uses hydrogen, a chemical element, to store energy. Its basic principle is the reverse reaction of water electrolysis. Hydrogen and oxygen are supplied to the anode and cathode, respectively. Hydrogen diffuses outward through the anode and reacts with the electrolyte, releasing electrons that travel through an external load to the cathode. During the production process, hydrogen fuel cells typically require airtightness testing to ensure quality. A search revealed that a typical existing hydrogen fuel cell airtightness testing device is a portable hydrogen fuel cell airtightness testing device (publication number CN219757648U), comprising: a housing; a receiving groove at one end of the housing's inner side; a return spring fixedly connected to the other end of the housing; a limit clamp fixedly connected to one end of the return spring; an external threaded fixing rod screwed to one end of the limit clamp; and a silicone buffer foot fixedly connected to the lower end of the limit clamp. Its main feature is that by twisting the handle, the outer screw fixing rod passes through the limiting pressure and connects with the inner screw groove. This allows pressure to be applied to the limiting pressure and the silicone buffer foot to fix the battery. Not only can the tightness be adjusted according to different battery specifications, but the battery can also be fixed without causing damage. Furthermore, when the battery is tested by an airtightness tester, the silicone buffer foot acts as a buffer to avoid vibration from affecting the test results. After the test, the outer screw fixing rod can be loosened.

[0003] In summary, existing hydrogen fuel cell airtightness testing equipment is mostly simple in structure for easy portability, meaning that the battery is usually manually removed and placed. However, the testing components are in a standstill during manual battery removal and placement, resulting in low testing continuity and low efficiency. To address these issues, existing equipment needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a hydrogen fuel cell air tightness testing device to solve the problem mentioned in the background art that existing hydrogen fuel cell air tightness testing devices are mostly simple in structure for easy portability, that is, they usually require manual removal and placement of the battery. When the battery is manually removed and placed, the testing components are in a stopped state, resulting in low testing continuity and low efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydrogen fuel cell airtightness testing device, comprising a base, a first placement plate, and a second placement plate.

[0006] The base is connected to a housing at its top, and a device slot is provided inside the top of the housing. A buzzer is installed on the front side of the housing. A motor is installed in the device slot, and the output end of the motor is connected to the top of the switching cylinder. A sealing cover is connected to one side of the switching cylinder, and a pressure sensor is installed on the top inner side of the sealing cover. The top inner side of the sealing cover is connected to an adjusting plate via an adjusting spring. An exhaust head is connected through the adjusting plate, and an electric valve is correspondingly installed on the exhaust head. A correction mechanism is connected to the inner wall of the sealing cover, and a control switch is connected to the bottom of the sealing cover. The control switch and the spring push block are correspondingly arranged vertically.

[0007] The first and second storage plates are both connected to the alternating lifting mechanism, and a pad is provided below the first and second storage plates. A telescopic mechanism is connected to the pad. A box door and a dust collection mechanism are respectively connected to the front and rear side walls of the housing. The dust collection mechanism and the exhaust head are respectively connected to the air inlet and exhaust port of the detection air pump. The detection air pump is installed inside the base.

[0008] Preferably, the equipment slot is connected to the air intake channel, and the air intake channel is located at the inner top of the housing.

[0009] Preferably, the adjusting plate is slidably connected inside the sealing cover, and the adjusting plate is positioned above the correction mechanism. At the same time, the correction mechanism is electrically connected to the controller, the detection air pump, and the control switch.

[0010] Preferably, the correction mechanism includes an electric telescopic column, a movable plate, a first buffer spring, and a correction plate. One side wall of the movable plate is connected to the inner wall of the sealing cover via the electric telescopic column, and the other side wall of the movable plate is connected to the correction plate via the first buffer spring. The correction plates are symmetrically distributed on the front, rear, left, and right side walls of the sealing cover.

[0011] Preferably, spring push blocks are symmetrically connected to both the first and second shelf panels, and the spring push blocks are disposed in the grooves at the top of the first and second shelf panels.

[0012] Preferably, the alternating lifting mechanism includes a first lead screw, a second lead screw, a first slide block, a second slide block, a connecting frame, and a motor. The first lead screw is connected to the second lead screw via a belt drive structure, and the bottom end of the first lead screw is connected to the output end of the motor. The first lead screw and the second lead screw are respectively connected to the first slide block and the second slide block, and the first slide block and the second slide block are respectively connected to the first shelf and the second shelf block via the connecting frame.

[0013] Preferably, the telescopic mechanism includes a first slide rod, a second slide rod, a telescopic rod, a lifting block, a push rod, and a telescopic spring. The first slide rod and the second slide rod are both connected through the pad. The bottom of the first slide rod and the second slide rod are both connected to the lifting block, and the front side of the lifting block is symmetrically provided with push rods.

[0014] Preferably, the push rod is correspondingly arranged with the extension block, and the extension block is fixedly connected to the inner side wall of the door.

[0015] Preferably, the lifting block is connected to the bottom of the pad through a telescopic rod and a telescopic spring, and the telescopic rod and the telescopic spring are symmetrically arranged on both sides of the first slide rod and the second slide rod.

[0016] Preferably, the dust collection mechanism includes a dust collection pipe, a dust collection box, a filter plate, an exhaust pipe, and a handle. The two ends of the exhaust pipe are respectively connected to the air inlet of the detection air pump and the dust collection box. The dust collection box is connected to the filter plate inside, and the top of the filter plate is connected to the handle. The other side of the dust collection box is connected to the shell through a dust collection pipe, and the dust collection pipes are symmetrically distributed on the dust collection box.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the hydrogen fuel cell airtightness testing device,

[0018] (1) The present invention can effectively solve the problem that existing hydrogen fuel cell air tightness testing equipment is mostly simple in structure for easy carrying, that is, the battery is usually picked up and put down manually. When the battery is picked up and put down manually, the testing component is in a stopped state, resulting in low testing continuity and low efficiency. When the motor drives the first lead screw to rotate, the first slide will drive the first placement plate and the hydrogen fuel cell on top of it to move down away from the sealing cover. At the same time, the second lead screw will rotate with the first lead screw under the linkage of the belt drive structure, so that the second slide will drive the second placement plate and the hydrogen fuel cell to be tested above it to move up. On the other hand, the motor drives the sealing cover to rotate through the switching cylinder to continue the testing work. At the same time, the staff can replace the workpiece on the first placement plate, thereby realizing automatic switching of loading and unloading, and there will be no phenomenon of the testing component stopping, thereby improving the continuity of testing and improving testing efficiency.

[0019] (2) The present invention can effectively solve the problem that existing airtightness testing equipment is prone to affecting the normal operation of the testing work due to the displacement and misalignment of the battery position when testing the battery by using the corrective mechanism, control switch and adjustment plate in combination. When the first and second placement plates move up, the spring push block at the top of them will move up synchronously to squeeze the control switch. After the control switch is pressed, it will control the multiple sets of electric telescopic columns in the corrective mechanism to push the correction plate to make the battery on the inside move inward to the center. That is, the battery is limited and corrected by multiple sets of moving correction plates. At the same time, the first buffer spring and the adjustment spring can provide buffer space for the battery to be tested from the horizontal and vertical directions respectively, thereby optimizing the structure of the device to meet the testing requirements of different batteries, thereby improving the practicality of the device and expanding its applicable range.

[0020] (3) The present invention can effectively solve the problem that existing airtightness testing equipment is mostly sealed in order to prevent the internal testing components from being contaminated. That is, the door needs to be opened manually when the parts are picked up or put down, which is not convenient to operate. After the first and second placement plates complete the testing work, they alternately move down along the first and second lead screws under the drive of the first and second slides. At the same time, the first and second slides in the telescopic mechanism will push the lifting block and the push rod to move down synchronously after being squeezed by the first and second placement plates that move down. When the push rod moves down, it will push the door through the extension block to make it rotate and open, so that the staff can easily replace the batteries on the corresponding placement plates, thereby improving the rationality of the device structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall structure of the telescopic mechanism and the connection relationship between the extension block and the pad plate of the present invention;

[0024] Figure 4 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 For the present invention Figure 1 Enlarged structural diagram at point B;

[0026] Figure 6 This is a schematic diagram of the overall structure of the dust collection mechanism of the present invention.

[0027] In the diagram: 1. Base; 2. Housing; 3. Equipment slot; 4. Motor; 5. Switching cylinder; 6. Air inlet channel; 7. Sealing cover; 8. Adjusting spring; 9. Adjusting plate; 10. Air pressure sensor; 11. Exhaust head; 12. Electric valve; 13. Correction mechanism; 1301. Electric telescopic column; 1302. Moving plate; 1303. First buffer spring; 1304. Correction plate; 14. Control switch; 15. First shelf; 16. Second shelf; 17. Alternating lifting mechanism; 1701. First lead screw; 1702. Second lead screw; 1703. 1704. First slide block; 1705. Second slide block; 1706. Connecting frame; 1707. Motor; 18. Detection air pump; 19. Spring push block; 20. Pad plate; 21. Telescopic mechanism; 2101. First slide rod; 2102. Second slide rod; 2103. Telescopic rod; 2104. Lifting block; 2105. Push rod; 2106. Telescopic spring; 22. Dust collection mechanism; 2201. Dust collection pipe; 2202. Dust collection box; 2203. Filter plate; 2204. Exhaust pipe; 2205. Handle; 23. Extension block; 24. Box door; 25. Buzzer. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-6 This invention provides a technical solution: a hydrogen fuel cell airtightness testing device, Example 1.

[0030] like Figure 1 , Figure 2 and Figure 4 As shown, the base 1, the first shelf 15, and the second shelf 16 are connected to the base 1. The top of the base 1 is connected to the housing 2, and the top of the housing 2 is provided with an equipment slot 3. A buzzer 25 is installed on the front side of the housing 2. A motor 4 is installed in the equipment slot 3, and the output end of the motor 4 is connected to the top of the switching cylinder 5. A sealing cover 7 is connected to one side of the switching cylinder 5, and a pressure sensor 10 is installed on the top of the inner side of the sealing cover 7. Pressure detection using the pressure sensor 10 is existing technology, and its specific working principle will not be described in detail here. The top of the inner side of the sealing cover 7 is connected to the adjusting plate 9 through the adjusting spring 8. An exhaust head 11 is connected through the adjusting plate 9, and an electric valve 12 is correspondingly provided on the exhaust head 11. A correction mechanism 13 is connected to the inner wall of the sealing cover 7, and a control switch 14 is connected to the bottom of the sealing cover 7. The control switch 14 and the spring push block 19 are correspondingly arranged vertically.

[0031] In a further embodiment, the equipment tank 3 is connected to the air intake channel 6, and the air intake channel 6 is located at the inner top of the housing 2. After the hydrogen fuel cell completes the test, the gas flow released will enter the equipment tank 3 through the air intake channel 6 and come into contact with the motor 4 to help dissipate heat, thereby avoiding overheating failure of the motor 4.

[0032] In a further embodiment, the adjusting plate 9 is slidably connected inside the sealing cover 7, and the adjusting plate 9 is positioned above the correction mechanism 13. Meanwhile, the correction mechanism 13 is electrically connected to the controller, the detection air pump 18, and the control switch 14.

[0033] In a further embodiment, the correction mechanism 13 includes an electric telescopic column 1301, a movable plate 1302, a first buffer spring 1303, and a correction plate 1304. One side wall of the movable plate 1302 is connected to the inner wall of the sealing cover 7 through the electric telescopic column 1301, and the other side wall of the movable plate 1302 is connected to the correction plate 1304 through the first buffer spring 1303. The correction plates 1304 are symmetrically distributed on the front, rear, left, and right side walls of the sealing cover 7.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first shelf 15 and the second shelf 16 are both connected to the alternating lifting mechanism 17, and a pad 20 is provided below the first shelf 15 and the second shelf 16. A telescopic mechanism 21 is connected to the pad 20. A box door 24 and a dust collection mechanism 22 are respectively connected to the front and rear side walls of the housing 2. The dust collection mechanism 22 and the exhaust head 11 are respectively connected to the air inlet and exhaust port of the detection air pump 18. At the same time, the detection air pump 18 is installed inside the base 1.

[0035] In a further embodiment, spring push blocks 19 are symmetrically connected to both the first shelf 15 and the second shelf 16, and the spring push blocks 19 are disposed in the grooves at the top of the first shelf 15 and the second shelf 16.

[0036] In a further embodiment, the alternating lifting mechanism 17 includes a first lead screw 1701, a second lead screw 1702, a first slide block 1703, a second slide block 1704, a connecting frame 1705, and a motor 1706. The first lead screw 1701 is connected to the second lead screw 1702 via a belt drive structure, and the bottom end of the first lead screw 1701 is connected to the output end of the motor 1706. The first slide block 1703 and the second slide block 1704 are respectively connected to the first lead screw 1701 and the second lead screw 1702, and the first slide block 1703 and the second slide block 1704 are respectively connected to the first shelf 15 and the second shelf 16 via the connecting frame 1705.

[0037] In a further embodiment, the telescopic mechanism 21 includes a first slide rod 2101, a second slide rod 2102, a telescopic rod 2103, a lifting block 2104, a push rod 2105, and a telescopic spring 2106. The first slide rod 2101 and the second slide rod 2102 are both connected through the pad 20. The bottom of the first slide rod 2101 and the second slide rod 2102 are both connected to the lifting block 2104, and the push rod 2105 is symmetrically arranged on the front side of the lifting block 2104.

[0038] In a further embodiment, the push rod 2105 is correspondingly arranged with the extension block 23, and the extension block 23 is fixedly connected to the inner wall of the door 24.

[0039] In a further embodiment, the lifting block 2104 is connected to the bottom of the pad 20 via a telescopic rod 2103 and a telescopic spring 2106, and the telescopic rod 2103 and the telescopic spring 2106 are symmetrically arranged on both sides of the first slide rod 2101 and the second slide rod 2102.

[0040] Specifically, in the actual working process, the hydrogen fuel cell to be tested is first placed on the first placement plate 15. When the motor 1706 drives the first lead screw 1701 to rotate, the first slide 1703 will drive the first placement plate 15 and the hydrogen fuel cell on top to move upward into the interior of the sealing cover 7. When the spring push block 19 on the top of the first placement plate 15 moves upward, it will squeeze the corresponding control switch 14. After the control switch 14 is pressed, it will activate multiple sets of electric telescopic columns 1301 to push the correction plate 1304 to center the hydrogen fuel cell on the first placement plate 15 and squeeze and fix it. During the upward movement, the hydrogen fuel cell will contact the exhaust head 11 and push the adjustment plate 9 upward by compressing the adjustment spring 8 through the exhaust head 11. Thus, hydrogen fuel cells of different sizes can be limited from the horizontal and vertical directions.

[0041] On the other hand, the second lead screw 1702 will rotate together with the first lead screw 1701 under the linkage of the belt drive structure, so that the second slide block 1704 will drive the second shelf 16 to move down. After being squeezed by the moving second shelf 16, the second slide rod 2102 will push the lifting block 2104 and the push rod 2105 to move down synchronously. When the push rod 2105 moves down, it will apply a pushing force to the front door 24 through the extension block 23 to make it rotate and open. Then the worker can place the workpiece on the second shelf 16, and then manually close the door 24 and apply pressure to it to prevent it from opening accidentally.

[0042] Next, the air pump 18 will continuously exhaust gas into the hydrogen fuel cell through the exhaust head 11 via the pipeline. The pressure sensor 10 will detect the air pressure inside the sealing cover 7 in real time. When the air pressure inside the sealing cover 7 is abnormal, indicating that the hydrogen fuel cell is leaking, the controller will control the buzzer 25 to sound an alarm. Otherwise, the test is considered qualified. After the test is completed, the motor 1706 reverses to move the first placement plate 15 and the hydrogen fuel cell that has completed the test downwards. The second placement plate 16 moves the hydrogen fuel cell to be tested upwards. The telescopic rod 2103 and the telescopic spring 2106 will drive the push rod 2105 to reset after the second placement plate 16 moves upwards, ending the compression of the extension block 23. At the same time, the motor 4 drives the sealing cover 7 to rotate above the second placement plate 16 through the switching cylinder 5. Then, the above operation is repeated to perform an airtightness test on the hydrogen fuel cell on the second placement plate 16.

[0043] Example 2

[0044] This embodiment is a further description of the above embodiments. It should be understood that this embodiment includes all the aforementioned technical features and is further described in detail.

[0045] like Figure 1 and Figure 6 As shown, in a further embodiment, the dust collection mechanism 22 includes a dust collection pipe 2201, a dust collection box 2202, a filter plate 2203, an exhaust pipe 2204, and a handle 2205. The two ends of the exhaust pipe 2204 are connected to the air inlet of the detection air pump 18 and the dust collection box 2202, respectively. The filter plate 2203 is connected inside the dust collection box 2202, and the handle 2205 is connected to the top of the filter plate 2203. When the filter plate 2203 needs to be cleaned, the operator can hold the handle 2205 to push the filter plate 2203 down, that is, use the upper part of the filter plate 2203 for filtration. At the same time, the exposed lower part of the filter plate 2203 can also be cleaned. The other side of the dust collection box 2202 is connected to the housing 2 through the dust collection pipe 2201, and the dust collection pipe 2201 is symmetrically distributed on the dust collection box 2202.

[0046] Specifically, when the test air pump 18 exhausts gas into the exhaust head 11, it will use the dust collection pipe 2201 to extract and remove dust from the hydrogen fuel cells to be tested on the first placement plate 15 and the second placement plate 16. This allows the dust on the hydrogen fuel cells to enter the dust collection box 2202 along with the airflow. The filter plate 2203 will filter and intercept the dust entering the dust collection box 2202. The filtered airflow will enter the test air pump 18 through the exhaust pipe 2204 and enter the exhaust head 11 under the drive of the test air pump 18 for airtightness testing. This will enrich the functionality of the device and prevent the test air pump 18 from blowing dust into the hydrogen fuel cells.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrogen fuel cell air tightness testing device, comprising a base (1), a first placement plate (15), and a second placement plate (16), characterized in that: The top of the base (1) is connected to the housing (2), and the top of the housing (2) is provided with an equipment slot (3). At the same time, a buzzer (25) is installed on the front side of the housing (2). A motor (4) is installed in the equipment slot (3), and the output end of the motor (4) is connected to the top of the switching cylinder (5). A sealing cover (7) is connected to one side of the switching cylinder (5), and a pressure sensor (10) is installed on the top of the inner side of the sealing cover (7). At the same time, the top of the inner side of the sealing cover (7) is connected to the adjusting plate (9) through the adjusting spring (8). An exhaust head (11) is connected through the adjusting plate (9), and an electric valve (12) is correspondingly provided on the exhaust head (11). A correction mechanism (13) is connected to the inner wall of the sealing cover (7), and a control switch (14) is connected to the bottom of the sealing cover (7). At the same time, the control switch (14) and the spring push block (19) are correspondingly arranged vertically. The first shelf (15) and the second shelf (16) are both connected to the alternating lifting mechanism (17), and a pad (20) is provided below the first shelf (15) and the second shelf (16), and a telescopic mechanism (21) is connected to the pad (20). The front side wall of the housing (2) is connected to the door (24), and the rear side wall is connected to the dust collection mechanism (22). The dust collection mechanism (22) is connected to the air inlet of the detection air pump (18), and the exhaust head (11) is connected to the exhaust port of the detection air pump (18). At the same time, the detection air pump (18) is installed inside the base (1). The adjusting plate (9) is slidably connected inside the sealing cover (7), and the adjusting plate (9) is located above the correction mechanism (13). At the same time, the correction mechanism (13) is electrically connected to the controller, the detection air pump (18) and the control switch (14). Spring push blocks (19) are symmetrically connected to both the first shelf (15) and the second shelf (16), and the spring push blocks (19) are located in the grooves at the top of the first shelf (15) and the second shelf (16); The telescopic mechanism (21) includes a first slide rod (2101), a second slide rod (2102), a telescopic rod (2103), a lifting block (2104), a push rod (2105), and a telescopic spring (2106). The first slide rod (2101) and the second slide rod (2102) are both connected through the pad (20). The bottom of the first slide rod (2101) and the second slide rod (2102) are both connected to the lifting block (2104), and the front side of the lifting block (2104) is symmetrically provided with push rods (2105). The push rod (2105) is correspondingly provided with the extension block (23), and the extension block (23) is fixedly connected to the inner wall of the box door (24).

2. The hydrogen fuel cell air tightness testing device according to claim 1, characterized in that: The equipment slot (3) is connected to the air intake channel (6), and the air intake channel (6) is located at the top inner part of the housing (2).

3. The hydrogen fuel cell air tightness testing device according to claim 1, characterized in that: The correction mechanism (13) includes an electric telescopic column (1301), a movable plate (1302), a first buffer spring (1303), and a correction plate (1304). One side wall of the movable plate (1302) is connected to the inner wall of the sealing cover (7) through the electric telescopic column (1301), and the other side wall of the movable plate (1302) is connected to the correction plate (1304) through the first buffer spring (1303). The correction plates (1304) are symmetrically distributed on the front, back, left and right side walls of the sealing cover (7).

4. The hydrogen fuel cell air tightness testing device according to claim 1, characterized in that: The alternating lifting mechanism (17) includes a first lead screw (1701), a second lead screw (1702), a first slide (1703), a second slide (1704), a connecting frame (1705), and a motor (1706). The first lead screw (1701) is connected to the second lead screw (1702) through a belt drive structure. At the same time, the bottom end of the first lead screw (1701) is connected to the output end of the motor (1706). The first slide (1703) and the second slide (1704) are respectively connected to the first lead screw (1701) and the second lead screw (1702). The first slide (1703) and the second slide (1704) are respectively connected to the first shelf (15) and the second shelf (16) through the connecting frame (1705).

5. The hydrogen fuel cell air tightness testing device according to claim 1, characterized in that: The lifting block (2104) is connected to the bottom of the pad (20) via a telescopic rod (2103) and a telescopic spring (2106), and the telescopic rod (2103) and the telescopic spring (2106) are symmetrically arranged on both sides of the first slide rod (2101) and the second slide rod (2102).

6. The hydrogen fuel cell air tightness testing device according to claim 1, characterized in that: The dust collection mechanism (22) includes a dust collection pipe (2201), a dust collection box (2202), a filter plate (2203), an exhaust pipe (2204), and a handle (2205). The two ends of the exhaust pipe (2204) are connected to the air inlet of the detection air pump (18) and the dust collection box (2202), respectively. The dust collection box (2202) is connected to the filter plate (2203) inside, and the top of the filter plate (2203) is connected to the handle (2205). The other side of the dust collection box (2202) is connected to the shell (2) through the dust collection pipe (2201), and the dust collection pipe (2201) is symmetrically distributed on the dust collection box (2202).

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