Parallel switching type filtering equipment

Abstract

The invention discloses parallel switching type filtering equipment which comprises symmetrical filter cartridges, cartridge covers are clamped to the tops of the symmetrical filter cartridges, quick release mechanisms are arranged in the middles of the cartridge covers, symmetrical clamping grooves are formed in the upper portions of inner cavities of the filter cartridges, the quick release mechanisms comprise clamping blocks, the clamping blocks are matched with the clamping grooves in a clamped mode, and the clamping blocks are connected with the clamping grooves in a clamped mode. Symmetrical transmission plates are connected to the middle of the upper end of the barrel cover in a sliding mode, an adjusting rod is connected between the symmetrical transmission plates in a sliding mode, when the transmission plates drive the adjusting rod to move downwards synchronously and vertically, the clamping blocks are kept static, and when the adjusting rods move upwards and drive the transmission plates to move upwards synchronously and vertically, the clamping blocks are close to the positions where the transmission plates are located. According to the invention, the parallel filter cartridges are additionally provided with the duplex three-way ball valve, so that the flow direction of gas is quickly switched, the filter element is cleaned or replaced without shutdown, multi-stage blocking is realized, the misoperation risk is reduced by the gas release structure, the detained gas can be controlled to be discharged, and accidental separation of components in a working state is avoided by the quick release mechanism and the mistaken touch prevention design.

Description

Technical Field

[0001] This invention relates to the field of gas filtration technology, specifically a parallel switching filtration device. Background Technology

[0002] Gas filtration is a core foundational technology in industrial production, environmental protection, and precision manufacturing. It mainly uses the synergistic effect of filter media and filtration equipment to intercept solid particles, colloids, and harmful impurities in gaseous media, thereby achieving the goals of gas purification, equipment protection, process assurance, and environmental safety.

[0003] In the process of gas filtration, for some commonly used single-cylinder filters, after long-term use, the filter screen and filter element will have a significantly reduced filtration effect due to the accumulation of impurities. At this time, it is necessary to shut down the air intake and stop the machine before the filter screen and filter element can be cleaned or replaced. This makes it impossible to filter the gas continuously for a long time, and when dealing with hazardous gases, there is a lack of multiple effective protection measures. Summary of the Invention

[0004] The purpose of this invention is to provide a parallel switching filtration device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A parallel switching filtration device includes symmetrical filter cartridges. A cover is snapped onto the top of each filter cartridge. A quick-release mechanism is provided in the middle of the cover. Symmetrical slots are formed in the upper part of the inner cavity of each filter cartridge. The quick-release mechanism includes a locking block that engages with the slot. Symmetrical transmission plates are slidably connected to the upper middle part of the cover. An adjusting rod is slidably connected between the symmetrical transmission plates. When the transmission plates move the adjusting rods vertically downwards synchronously, the locking blocks remain stationary. When the adjusting rods move upwards and move the transmission plates vertically upwards synchronously, the locking blocks approach the position of the transmission plates.

[0007] As a further aspect of the present invention: symmetrical three-way ball valves are fixedly connected between the symmetrical filter cartridges. A blocking valve is fixedly connected to the middle of both sides of the upper end of the three-way ball valve. Multiple venting keys are fixedly connected to the middle of one side of the three-way ball valve. Two venting keys are fixedly connected to the outer wall of the filter cartridge near the three-way ball valve. A handle is fixedly connected to the top of the symmetrical transmission plates. The top of the adjusting rod and the middle of the lower end of the handle are elastically connected by a second spring.

[0008] As a further embodiment of the present invention: a mounting shell is fixedly connected to the lower middle part of the cylinder cover, a through groove is opened in the middle of the inner cavity of the mounting shell, and symmetrical sliders are slidably connected to the inner cavity of the through groove. The symmetrical sliders are elastically connected to each other by symmetrical first springs, and the locking block is fixedly connected to the lower part of the slider on the side away from the transmission plate.

[0009] As a further embodiment of the present invention: a transmission block is fixedly connected to the lower middle part of the transmission plate, and a symmetrical sliding groove is opened in the inner cavity of the mounting shell. The transmission block and the transmission plate are both vertically slidably connected in the sliding groove. The width of the sliding groove is the same as that of the transmission block, and the width of the transmission block is greater than that of the transmission plate. The upper two sides of the transmission block are elastically connected to the top of the inner cavity of the sliding groove by a third spring.

[0010] As a further aspect of the present invention: a movable plate is slidably connected to the middle of both sides of the transmission block, and a movable rod is fixedly connected to the end of the movable plate away from the transmission block; the spacing between the symmetrical transmission blocks is the same as the width of the slider.

[0011] As a further aspect of the present invention: a symmetrical moving groove is provided on the side of the outer wall of the slider near the transmission plate, a horizontal groove is provided on the lower end of the moving groove away from the transmission plate, a guide groove is provided on the end of the horizontal groove away from the moving groove, the guide groove is composed of a section of inclined groove and two sections of vertical groove, the lower vertical groove is connected to the horizontal groove, the horizontal distance between the two ends of the inclined groove is greater than the length of the locking block, the end of the moving rod away from the moving plate is slidably engaged with the moving groove, the horizontal groove and the guide groove, and the width of the horizontal groove is greater than the diameter of the moving rod.

[0012] As a further aspect of the present invention: a transmission rod is slidably connected to the upper middle part of the transmission block, the transmission rod is slidably connected perpendicularly to the inner cavity of the transmission plate, a connecting rod is fixedly connected to the lower end of the adjusting rod, and the lower ends of the connecting rod are respectively fixedly connected to symmetrical transmission rods on both sides. A movable groove is provided on the upper middle part of the transmission plate near the adjusting rod, and the transmission rod is slidably connected perpendicularly to the movable groove.

[0013] As a further embodiment of the present invention: both sides of the lower end of the transmission rod are fixedly connected to driven plates, the driven plates are slidably connected to the transmission block, a driven groove is provided on the side of the driven plate away from the transmission rod, a limit groove is provided at the lower end of the driven groove, a driven rod is fixedly connected to the middle of the end of the moving plate away from the moving rod, and the end of the driven rod away from the moving plate is slidably engaged with the driven groove and the limit groove.

[0014] As a further aspect of the present invention: a symmetrical elastic vertical plate is fixedly connected to the lower end of the mounting shell, the position of the elastic vertical plate is perpendicular to the position of the through groove, a perforated plate is fixedly connected to the lower part of the inner cavity of the filter cartridge, a filter element is attached to the upper end of the perforated plate, a fixing ring is fixedly connected to the upper end of the filter element, and a filter screen is provided above the filter element.

[0015] As a further embodiment of the present invention: the outer walls of the filter screen and the fixing ring are provided with symmetrical grooves, the positions of the grooves correspond to those of the elastic vertical plate, a positioning groove is provided in the middle of the groove, and a positioning rod is fixedly connected to the side wall of the elastic vertical plate, the positioning rod and the positioning groove are engaged.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The parallel filter cartridges, coupled with a double L-shaped three-way ball valve, enable rapid switching of gas flow direction, allowing for filter cleaning or replacement without machine downtime and ensuring uninterrupted gas filtration operations. A multi-stage blocking and venting structure (multiple valves in series) reduces the risk of misoperation, allowing controlled discharge of trapped gas in hazardous gas scenarios. A quick-release mechanism with anti-accidental contact design prevents accidental separation of components during operation. Disassembly requires three consecutive actions: pressing, pulling the adjusting rod, and then pulling the handle. A single accidental contact or collision will not trigger disassembly, preventing accidental separation of the cartridge cover during operation. The direction of the adjusting rod pull is consistent with the subsequent handle pull direction, without affecting disassembly speed, achieving a dual effect of "quick disassembly + safe anti-accidental contact." Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the venting key in this invention.

[0020] Figure 3 This is a schematic diagram of the filter cartridge in this invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the filter cartridge in this invention.

[0022] Figure 5 For the present invention Figure 4 A schematic diagram of the structure of area A in the middle.

[0023] Figure 6 This is a schematic diagram of the filter element in this invention.

[0024] Figure 7 For the present invention Figure 6 A schematic diagram of the structure of area B in the middle.

[0025] Figure 8This is a schematic diagram of the quick-release mechanism in this invention.

[0026] Figure 9 This is a schematic diagram of the adjusting rod in this invention.

[0027] Figure 10 This is a schematic diagram of the transmission block in this invention.

[0028] In the diagram: 1. Three-way ball valve; 2. Filter cartridge; 3. Vent key; 4. Exhaust key; 5. Shut-off valve; 6. Cylinder cover; 7. Handle; 8. Adjusting rod; 9. Transmission plate; 10. Mounting housing; 11. Filter screen; 12. Elastic vertical plate; 13. Filter element; 14. Fixing ring; 15. Perforated plate; 16. Groove; 17. Positioning groove; 18. Positioning rod; 19. Slot; 20. Slot block; 21. Through groove; 22. Slider; 23. Moving groove; 24. Horizontal groove; 25. Guide groove; 26. Moving rod; 27. Moving plate; 28. Transmission block; 29. ​​Connecting rod; 30. Transmission rod; 31. Movable groove; 32. Driven plate; 33. Driven rod; 34. Driven groove; 35. Limiting groove. Detailed Implementation

[0029] Please see Figure 1-5 In this embodiment of the invention, a parallel switching filtration device includes symmetrical filter cartridges 2. A cartridge cover 6 is snapped onto the top of the symmetrical filter cartridges 2. A quick-release mechanism is provided in the middle of the cartridge cover 6. A symmetrical slot 19 is provided in the upper part of the inner cavity of the filter cartridge 2. The quick-release mechanism includes a locking block 20, which engages with the slot 19. A symmetrical transmission plate 9 is slidably connected to the upper middle part of the cartridge cover 6. An adjusting rod 8 is slidably connected between the symmetrical transmission plates 9. When the transmission plate 9 drives the adjusting rod 8 to move vertically downward synchronously, the locking block 20 remains stationary. When the adjusting rod 8 moves upward and drives the transmission plate 9 to move vertically upward synchronously, the locking block 20 approaches the position of the transmission plate 9.

[0030] Symmetrical filter cartridges 2 are fixedly connected by symmetrical three-way ball valves 1. The outer wall of each filter cartridge 2 has an inlet and an outlet on the side closest to the three-way ball valves 1, with the inlet located at the top. Therefore, the upper three-way ball valve 1 is used to supply gas into the filter cartridge 2, while the lower three-way ball valve 1 is used to output gas. The three-way ball valves 1 are L-shaped. This type of three-way ball valve has a 90° right-angle flow path; it connects only two positive flow channels, and switching is completed by a 90° rotation. It is suitable for simple flow direction reversal (such as switching from A→B to A→C). It can quickly change the gas flow direction and is a commonly used technical means in the prior art. That is, when one filter cartridge 2 is filtering the gas, the other filter cartridge 2 has no gas flow in its inner cavity and serves as a backup. When the filter cartridge 2 used to filter the gas needs to be replaced or the filter element needs to be cleaned, the gas flow direction can be quickly switched to the backup filter cartridge 2. Thus, the gas filtration operation can be carried out without interruption when the filter element is replaced. The dual filter is a parallel switching filtration device, which is composed of two single-tube filters combined by a three-way ball valve. It can operate continuously without stopping the machine when cleaning or replacing the filter element.

[0031] Both sides of the upper end of the three-way ball valve 1 are fixedly connected to shut-off valves 5. The gas flow can be blocked by opening and closing the shut-off valves 5. When handling hazardous gases, additional safety measures may be required to ensure the safety of personnel and equipment. The shut-off valves 5 allow for rapid cutting off of the gas flow. Multiple vent keys 4 are fixedly connected to the middle of one side of the three-way ball valve 1. Two valves are connected in series at the upper end of each vent key 4. When releasing gas trapped inside the three-way ball valve 1, the shut-off valves 5 are closed first to cut off the gas flow and prevent... Gas continuously flows into the inner cavity of filter cartridge 2, and then the valves connected in series on the exhaust key 4 are opened in sequence to release the gas in the inner cavity of the three-way ball valve 1. Two exhaust keys 3 are fixedly connected to the outer wall of filter cartridge 2 near the three-way ball valve 1. Three valves are connected in series on the outer wall of the exhaust key 3. Only by opening the three valves in sequence can the gas trapped in filter cartridge 2 be released. Since the operator needs to switch three times to complete the flow direction conversion, the risk of misoperation is minimized, while ensuring that the gas trapped between the valves can be discharged through the controlled process.

[0032] Please see Figure 4-6A mounting shell 10 is fixedly connected to the lower center of the cylinder cover 6. A through groove 21 is provided in the middle of the inner cavity of the mounting shell 10. Symmetrical sliders 22 are slidably connected to the inner cavity of the through groove 21. The symmetrical sliders 22 are elastically connected to each other by symmetrical first springs. The elastic force of the first springs is used to push the sliders 22 away from the center position of the mounting shell 10. A locking block 20 is fixedly connected to the lower part of the slider 22 on the side away from the transmission plate 9. The locking block 20 engages with the locking groove 19. When the first spring is in an extended state, the locking block 20 is located in the inner cavity of the locking groove 19, and then the locking block and the locking groove 19 engage. The snap-fit ​​of 20 completes the fixation of the cylinder cover 6 and the filter cartridge 2, and the outer wall of the mounting shell 10 is fitted with a sealing ring to ensure that the gas flowing into the filter cartridge 2 will not leak out from the position of the cylinder cover 6. The top of the symmetrical transmission plates 9 are fixedly connected to the handle 7. By pressing the handle 7 downward, the transmission plate 9 and the adjusting rod 8 can be driven to move vertically downward in sync. The top of the adjusting rod 8 and the lower middle part of the handle 7 are elastically connected by a second spring. The elastic force of the second spring keeps the adjusting rod 8 away from the handle 7, so that when the handle 7 and the transmission plate 9 move downward, the adjusting rod 8 will also move downward in sync.

[0033] Please see Figure 8 A transmission block 28 is fixedly connected to the lower middle part of the transmission plate 9. The inner cavity of the mounting shell 10 is provided with symmetrical sliding grooves. The transmission block 28 and the transmission plate 9 are both vertically slidably connected in the sliding grooves. The width of the sliding groove is the same as that of the transmission block 28. The width of the transmission block 28 is greater than that of the transmission plate 9. The upper two sides of the transmission block 28 are elastically connected to the top of the inner cavity of the sliding groove through a third spring. The elastic force of the third spring is used to pull the transmission block 28 upward, so that it is away from the top of the inner cavity of the sliding groove. The sliding groove and the through groove 21 are connected. The middle of both sides of the transmission block 28 are slidably connected to a moving plate 27. The end of the moving plate 27 away from the transmission block 28 is fixedly connected to a moving rod 26. The distance between the symmetrical transmission blocks 28 is the same as the width of the slider 22. When the transmission plate 9 drives the transmission block 28 to move downward, it will simultaneously drive the moving rod 26 and the moving plate 27 to move vertically downward.

[0034] A symmetrical moving groove 23 is provided on the outer wall of the slider 22 near the transmission plate 9. A horizontal groove 24 is provided on the lower end of the moving groove 23 away from the transmission plate 9. The moving groove 23 and the horizontal groove 24 are perpendicular to each other. A guide groove 25 is provided at the end of the horizontal groove 24 away from the moving groove 23. The guide groove 25 is composed of a section of inclined groove and two sections of vertical groove. The lower vertical groove is connected to the horizontal groove 24. The horizontal distance between the two ends of the inclined groove is greater than the length of the locking block 20. The end of the moving rod 26 away from the moving plate 27 is in sliding engagement with the moving groove 23, the horizontal groove 24 and the guide groove 25. When the transmission plate 9 drives the transmission block 28 to move vertically downward, it will drive the moving rod 26 to move vertically downward in the inner cavity of the moving groove 23. The width of the horizontal groove 24 is greater than the diameter of the moving rod 26. Therefore, when the moving rod 26 moves vertically to the connection between the moving groove 23 and the horizontal groove 24, if the moving rod 26 is not subjected to a horizontal force away from the direction of the transmission plate 9, then the moving rod 26 will not enter the inner cavity of the horizontal groove 24, but will only remain in the inner cavity of the moving groove 23. At this time, after the handle 7 drives the transmission plate 9 to move upward, the moving rod 26 will only move upward along the inner cavity of the moving groove 23.

[0035] Please see Figure 8-10 A transmission rod 30 is slidably connected to the upper middle part of the transmission block 28. The transmission rod 30 is slidably connected to the inner cavity of the transmission plate 9. A connecting rod 29 is fixedly connected to the lower end of the adjusting rod 8. The lower ends of the connecting rod 29 are fixedly connected to the symmetrical transmission rods 30 on both sides. A movable groove 31 is provided on the upper middle part of the transmission plate 9 near the adjusting rod 8. The transmission rod 30 is slidably connected to the movable groove 31. When the adjusting rod 8 moves upward relative to the position of the transmission plate 9, the adjusting rod 8 will drive the transmission block 28 and the transmission rod 30 to move upward in the inner cavity of the movable groove 31. A driven plate 32 is fixedly connected to both sides of the lower end of the transmission rod 30. The driven plate 32 is slidably connected to the transmission block 28. A driven groove 34 is provided on the side of the driven plate 32 away from the transmission rod 30. A limit groove 35 is provided at the lower end of the driven groove 34.

[0036] A driven rod 33 is fixedly connected to the middle of the end of the movable plate 27 away from the movable rod 26. The end of the driven rod 33 away from the movable plate 27 is slidably engaged with the driven groove 34 and the limiting groove 35. When the adjusting rod 8 moves upward relative to the transmission plate 9, it will drive the driven plate 32 to move upward. Thus, through the sliding engagement of the driven groove 34 and the driven rod 33, the movable plate 27 and the movable rod 26 are driven horizontally away from the position of the transmission plate 9. At this time, if the transmission plate 9 is in the position after it has moved downward, that is, when the movable rod 26 is located at the connection between the movable groove 23 and the horizontal groove 24, then the movable rod 26 will horizontally enter the inner cavity of the horizontal groove 24. When the driven rod 33 moves relative to the inner cavity of the limiting groove 35, the movable rod 26 is located at the connection between the horizontal groove 24 and the guide groove 25, that is, the connection between the horizontal groove 24 and the vertical groove below.

[0037] Please see Figure 4-5 and Figure 8-10 When in this state, when the adjusting rod 8 and the transmission plate 9 move vertically upwards synchronously, the moving rod 26, while remaining horizontally away from the transmission plate 9, moves vertically upwards. The moving rod 26 then enters the inclined groove through the vertical slot below its position. Through the sliding cooperation between the inclined groove and the moving rod 26, the slider 22 is driven horizontally closer to the position of the transmission plate 9, thereby driving the locking block 20 away from the position of the locking slot 19. This releases the fixation between the cover 6 and the filter cartridge 2. Specifically, by pressing down the handle 7, the adjusting rod 8 and the transmission plate 9 move vertically downwards synchronously, allowing... The moving rod 26 moves to the connection between the moving groove 23 and the horizontal groove 24. At this time, with the position of the transmission plate 9 remaining unchanged, the adjusting rod 8 is pulled upward. This drives the driven plate 32 to move vertically upward through the connecting rod 29 and the transmission rod 30, thereby driving the moving rod 26 to move horizontally to the connection between the horizontal groove 24 and the guide groove 25. Then, while the adjusting rod 8 is in a state of moving upward relative to the transmission plate 9, the adjusted rod 8 and the transmission plate 9 are driven to move upward synchronously, so that the moving rod 26 enters the inner cavity of the guide groove 25, completing the separation of the slot 19 and the block 20.

[0038] By pressing down on handle 7, the transmission block 28 moves to the bottom of the inner cavity of the slide groove. After pressing down on handle 7 until it can no longer move, pull up the adjusting rod 8 separately. While the adjusting rod 8 is in the upward position, pull up handle 7 to move the transmission plate 9 upward, thus completing the separation of the cover 6 and the filter cartridge 2. While quickly releasing the fixed state between the filter cartridge 2 and the cover 6, the setting of pulling up the adjusting rod 8 separately can avoid accidental contact and collision that could cause the cover 6 to separate from the filter cartridge 2 when it is in working state, thereby affecting the filtration of gas and the personal safety of the staff. When the adjusting rod 8 is pulled up, its movement direction is upward, which is the same as the movement direction of the subsequent downward pull of handle 7. This avoids the risk of accidental contact that may be caused by the quick-release mechanism. At the same time, the anti-accidental contact setting does not affect the disassembly speed, thus achieving a quick and safe disassembly method.

[0039] Furthermore, during installation, simply press down on handle 7 and then release it to automatically install the cylinder cover 6. Place the cylinder cover 6 and mounting shell 10 into the filter cartridge 2, aligning them with the slot 19. Then press down on handle 7. During the disassembly of the cylinder cover 6, the moving rod 26 eventually moves into the upper vertical slot. At this time, the first spring is in a contracted state. The cooperation between the moving rod 26 and the upper vertical slot prevents the first spring from rebounding. When handle 7 is moved down again, the transmission plate 9 and transmission block 28 will move to the bottom of the inner cavity of the slide groove again. During this process, the first spring rebounds. When the moving rod 26 enters the inclined groove, the rebound force... The downward-moving rod 26 accelerates through the inclined groove, allowing the locking block 20 to quickly enter the locking groove 19, completing the installation and fixation between the cylinder cover 6 and the filter cylinder 2. When the moving rod 26 moves to the connection between the horizontal groove 24 and the guide groove 25, no external force needs to be applied to the adjusting rod 8. Under the rebound action of the second spring, the connecting rod 29, the transmission rod 30, and the driven plate 32 will be driven to move downward relative to the transmission plate 9, causing the moving rod 26 to automatically return to the moving groove 23. Then, under the rebound action of the third spring, the handle 7, the adjusting rod 8, and the transmission plate 9 will return to the top of the inner cavity of the moving groove 23, thus quickly and conveniently completing the installation and fixation of the cylinder cover 6.

[0040] Please see Figure 6-7 A symmetrical elastic vertical plate 12 is fixedly connected to the lower end of the mounting shell 10. The position of the elastic vertical plate 12 is perpendicular to the position of the through groove 21. A perforated plate 15 is fixedly connected to the lower part of the inner cavity of the filter cartridge 2. The perforated plate 15 is located above the discharge port. A filter element 13 is attached to the upper end of the perforated plate 15. A filter screen 11 is located above the filter element 13 and below the feed port. A fixing ring 14 is fixedly connected to the upper end of the filter element 13. Symmetrical grooves 16 are opened on the outer walls of both the filter screen 11 and the fixing ring 14. The position of the grooves 16 is... Corresponding to the elastic vertical plate 12, a positioning groove 17 is provided in the middle of the groove 16. A positioning rod 18 is fixedly connected to the side wall of the elastic vertical plate 12. The positioning rod 18 and the positioning groove 17 are engaged. The positioning groove 17 on the filter screen 11 is conical, and the positioning rod 18 corresponding to the filter screen 11 is also conical. The positioning groove 17 on the fixing ring 14 is cylindrical, and the positioning rod 18 corresponding to the fixing ring 14 is also cylindrical. The length of the conical positioning rod 18 is greater than the length of the cylindrical positioning rod 18.

[0041] When installing the filter screen 11 and the fixing ring 14 onto the elastic vertical plate 12, the filter screen 11 is installed first, followed by the fixing ring 14. Due to the large length of the conical positioning rod 18, during the installation of the fixing ring 14 and the outward bending of the elastic vertical plate 12, the conical positioning rod 18 will not disengage from the conical positioning groove 17. During the quick disassembly and installation of the cylinder cover 6, the filter screen 11 and filter element 13 can also be quickly disassembled and installed, thus quickly completing the cleaning or replacement of the filter screen 11 and filter element 13. Furthermore, the filter screen 11 and filter element 13 are detached from the filter cylinder 2 along with the cylinder cover 6 and simultaneously reinstalled in the inner cavity of the filter cylinder 2. There is no need to place the filter element 13 and filter screen 11 separately in the filter cylinder 2, avoiding position adjustments during the installation process and further improving the efficiency of installation and disassembly.

Claims

1. A parallel switching filtration device, comprising symmetrical filter cartridges, characterized in that, The top of the symmetrical filter cartridge is fitted with a cartridge cover, and a quick-release mechanism is provided in the middle of the cartridge cover. The upper part of the inner cavity of the filter cartridge has symmetrical slots. The quick-release mechanism includes a locking block, which engages with the slot. The upper middle part of the cartridge cover is slidably connected to symmetrical transmission plates. An adjusting rod is slidably connected between the symmetrical transmission plates. When the transmission plates drive the adjusting rod to move vertically downward synchronously, the locking block remains stationary. When the adjusting rod moves upward and drives the transmission plates to move vertically upward synchronously, the locking block approaches the position of the transmission plates.

2. The parallel switching filtration device according to claim 1, characterized in that, The symmetrical filter cartridges are fixedly connected to each other by symmetrical three-way ball valves. The upper two sides of each three-way ball valve are fixedly connected to a blocking valve. Multiple venting keys are fixedly connected to the middle of one side of each three-way ball valve. Two venting keys are fixedly connected to the outer wall of each filter cartridge near the three-way ball valve. The top of each symmetrical transmission plate is fixedly connected to a handle. The top of the adjusting rod and the lower middle of the handle are elastically connected by a second spring.

3. The parallel switching filtration device according to claim 2, characterized in that, A mounting shell is fixedly connected to the lower center of the cylinder cover. A through groove is provided in the middle of the inner cavity of the mounting shell. A symmetrical slider is slidably connected to the inner cavity of the through groove. The symmetrical sliders are elastically connected to each other by a symmetrical first spring. The locking block is fixedly connected to the lower part of the slider on the side away from the transmission plate.

4. A parallel switching filtration device according to claim 3, characterized in that, A transmission block is fixedly connected to the lower middle part of the transmission plate. The inner cavity of the mounting shell is provided with symmetrical sliding grooves. The transmission block and the transmission plate are both vertically slidably connected in the sliding grooves. The width of the sliding groove is the same as that of the transmission block. The width of the transmission block is greater than that of the transmission plate. The upper two sides of the transmission block are elastically connected to the top of the inner cavity of the sliding groove by a third spring.

5. A parallel switching filtration device according to claim 4, characterized in that, The transmission block has a movable plate slidably connected to the middle of both sides, and a movable rod is fixedly connected to the end of the movable plate away from the transmission block. The distance between the symmetrical transmission blocks is the same as the width of the slider.

6. A parallel switching filtration device according to claim 4, characterized in that, The outer wall of the slider has symmetrical moving grooves on the side near the transmission plate. The lower end of the moving groove has a horizontal groove on the side away from the transmission plate. The horizontal groove has a guide groove at the end away from the moving groove. The guide groove consists of a slanted groove and two vertical grooves. The lower vertical groove is connected to the horizontal groove. The horizontal distance between the two ends of the slanted groove is greater than the length of the locking block. The end of the moving rod away from the moving plate slides in cooperation with the moving groove, the horizontal groove and the guide groove. The width of the horizontal groove is greater than the diameter of the moving rod.

7. A parallel switching filtration device according to claim 6, characterized in that, A transmission rod is slidably connected to the upper middle part of the transmission block. The transmission rod is slidably connected perpendicularly to the inner cavity of the transmission plate. A connecting rod is fixedly connected to the lower end of the adjusting rod. The lower ends of the connecting rod are fixedly connected to symmetrical transmission rods on both sides. A movable groove is opened on the upper middle part of the transmission plate near the adjusting rod. The transmission rod is slidably connected perpendicularly to the movable groove.

8. A parallel switching filtration device according to claim 7, characterized in that, Both sides of the lower end of the transmission rod are fixedly connected to driven plates. The driven plates are slidably connected to the transmission block. A driven groove is provided on the side of the driven plate away from the transmission rod. A limit groove is provided at the lower end of the driven groove. A driven rod is fixedly connected to the middle of the end of the moving plate away from the moving rod. The end of the driven rod away from the moving plate is slidably engaged with the driven groove and the limit groove.

9. A parallel switching filtration device according to claim 4, characterized in that, The lower end of the mounting shell is fixedly connected to symmetrical elastic vertical plates, the position of which is perpendicular to the position of the through groove. The lower part of the inner cavity of the filter cartridge is fixedly connected to a perforated plate, the upper end of which is fitted with a filter element, the upper end of which is fixedly connected to a fixing ring, and a filter screen is provided above the filter element.

10. A parallel switching filtration device according to claim 9, characterized in that, The outer walls of the filter screen and the fixing ring are provided with symmetrical grooves, the positions of the grooves correspond to those of the elastic vertical plate, the middle of the groove is provided with a positioning groove, and the side wall of the elastic vertical plate is fixedly connected with a positioning rod, the positioning rod and the positioning groove are engaged.

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