Multi-stage filtering device for bubble water machine

Abstract

The application discloses a kind of multi-stage filtering device for bubble water machine, it is related to filtering device technical field, including: bubble water machine and fixedly connected in the water inlet of bubble water machine reflux box, the top of the reflux box is fixedly connected with filter box, the inside of the filter box is provided with filter soft film;Rolling mechanism is located in the inside of the filter box, for the filter soft film is rolled up;Second piston plate, the second piston plate is arranged in the inside of the filter box, the inside of the second piston plate is fixedly connected with first piston plate by bolt assembly, the inside of the filter box is provided with for the first piston plate position is switched and used auxiliary switcher;Jetting assembly is located in the inside of the filter box, for the filter soft film is flushed.The application is matched by setting first piston plate and other parts, to realize the water that enters the inside of bubble water machine is filtered in multiple stages, to improve the cleanliness and taste of water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtering devices, in particular to a multi-stage filtering device for a bubble water machine. BACKGROUND

[0002] A bubble water machine is a device specifically used for making bubble water. It forms drinking water rich in bubbles by injecting carbon dioxide gas into the water. The working principle is as follows: the working principle of the bubble water machine is mainly to use compressed carbon dioxide gas, which is injected into the water through high pressure, so that the carbon dioxide reaches a saturated state in the water, thereby generating bubbles. This process usually involves a gas cylinder or a gas bomb for storing compressed carbon dioxide.

[0003] The existing bubble water machine only filters the water through a simple filter screen during use. However, the filter screen only simply blocks dirt and may not be able to completely filter the drinking water, especially the chlorine and odor in the water, which can affect the taste of the user. Therefore, we provide a multi-stage filtering device for a bubble water machine to solve the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problem that the water used by the bubble water machine cannot be multi-stage filtered, and to provide a multi-stage filtering device for a bubble water machine.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a multi-stage filtering device for a bubble water machine, comprising: a bubble water machine and a reflux tank fixedly connected to the water inlet of the bubble water machine, a filter tank fixedly connected to the top of the reflux tank, and a filter soft film arranged on the inner side of the filter tank; a winding mechanism arranged on the inner side of the filter tank for winding the filter soft film; a second piston plate arranged on the inner side of the filter tank, a first piston plate fixedly connected to the inner side of the second piston plate through a bolt assembly, and an auxiliary switch arranged on the inner side of the filter tank for switching the position of the first piston plate; and a jetting assembly arranged on the inner side of the filter tank for flushing the filter soft film.

[0006] As a further scheme of the present application: the winding mechanism comprises a filter frame fixedly connected to the inner side of the filter tank, the filter soft film passes through the middle of the filter frame, two drive motors are installed on the top of the filter tank, one winding rod is fixedly connected to the output end of each drive motor, and one end of the winding rod penetrates into the inner side of the filter tank and winds the filter soft film.

[0007] As a further further scheme of the present application: the auxiliary switch includes a piston shell fixedly connected inside the filter box, the second piston plate is slidingly connected inside the piston shell, one side of the second piston plate is fixedly connected with a piston block, and the piston block is slidingly connected inside the piston shell, the piston block, the second piston plate and the first piston plate constitute a piston body inside the piston shell, the piston body makes piston movement inside the piston shell, both sides of the piston shell are provided with through grooves communicated with the inside, and the top of the filter box is fixedly connected with a sealing cover through bolt assemblies.

[0008] As a further further scheme of the present application: the auxiliary switch further includes a one-way threaded screw rod rotatably connected inside the piston shell, the piston block is threadedly connected with the outer wall of the one-way threaded screw rod, one end of the one-way threaded screw rod penetrates to the top of the piston shell, the winding rod and the outer wall of the one-way threaded screw rod are fixedly connected with a belt pulley, the outer walls of the two belt pulleys are provided with a belt, the top and the bottom of the piston block are fixedly connected with a first corrugated hose, one end of the two first corrugated hoses is fixedly connected with the inside bottom and the inside top of the piston shell respectively, and the one-way threaded screw rod is arranged inside the two first corrugated hoses.

[0009] As a further further scheme of the present application: the front and back sides of the first piston plate and the front and back sides of the second piston plate are composed of multiple filter screens, multiple partition plates are fixedly connected with the inside of the first piston plate, and the multiple partition plates separate the filter screens on the front and back sides of the first piston plate.

[0010] As a further further scheme of the present application: the air injection assembly includes two support pipes fixedly connected with the inside of the filter frame, multiple exhaust pipes are fixedly connected with the air outlets of the two support pipes, the multiple exhaust pipes are fixedly connected through an exhaust plate, the exhaust plate is arranged at the bottom of the filter soft film, a second one-way valve is fixedly connected with the air inlet of one of the support pipes, one end of the second one-way valve penetrates to the inside of the piston shell, a piston sleeve is fixedly connected with the inside of the piston shell, one end of the piston sleeve penetrates to the inside of the filter box and is fixedly connected with the filter box, a second corrugated hose is fixedly connected with the end of the piston sleeve, one end of the second corrugated hose is fixedly connected with the inside of the piston shell, the inside of the piston sleeve is provided with an air inlet penetrating to the outside, a third one-way valve is fixedly connected with the air inlet of the piston sleeve, a micro electric push rod is arranged on one side of the filter box, a first piston ring is fixedly connected with the output end of the micro electric push rod penetrating to the inside of the piston sleeve, the first piston ring is slidingly connected with the inside of the piston sleeve, and a sealing ring is arranged between the output end of the piston sleeve and the piston sleeve for sealing the gap therebetween.

[0011] As a further scheme of the present application: the air injection assembly further comprises a guide pipe fixedly connected at the air inlet of the other support pipe, the piston sleeve and the second corrugated hose are both provided with two, the two piston sleeves are communicated through a communication pipe, a second piston ring is slidably connected in the other piston sleeve, and a connecting spring is installed between the second piston ring and the piston sleeve, a first one-way valve is installed at the air inlet of the guide pipe, and one end of the first one-way valve extends into the second corrugated hose.

[0012] As a further scheme of the present application: the inside of the filter frame is provided with a groove, a piston sleeve is fixedly connected at the inside of the groove, and the piston sleeve is attached to the top of the filter soft film, and a fixed pipe is fixedly connected at the inside of the filter frame, and one end of the fixed pipe extends into the inside of the groove.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] 1. By setting the first piston plate and other parts, the inside of the reflux box is longitudinally distributed from top to bottom with a reverse osmosis filter, a mineralization filter and an ultraviolet sterilization lamp in sequence, the reverse osmosis filter removes small particles and microorganisms in water through physical barriers, the mineralization filter further optimizes water quality, removes heavy metals and increases mineral content in water, and the post-filter ensures water safety, kills bacteria and viruses in water through ultraviolet rays or other ways, and removes odors and bacteria through the activated carbon particles placed in the first piston plate, and the filter soft film at the front end filters particles in water, so that the water entering the bubble water machine is filtered in multiple stages, thereby improving the cleanliness and taste of the water.

[0015] 2. By setting the winding mechanism, the PLC controller can control the intermittent start of the drive motor, when the filter soft film inside the filter frame has been used for a long time, two drive motors can be started, one drive motor output end drives a winding rod to wind the filter soft film, and the other drive motor output end drives a winding rod to release the filter soft film, so that the filter soft film can move horizontally, and the used filter soft film moves to the outside of the filter frame, and the new filter soft film moves to the inside of the filter frame for filtering, thereby ensuring continuous and efficient filtering effect, reducing the cost and time of manual maintenance, and saving time and effort, thereby improving the overall practicality of the device.

[0016] 3. By setting an auxiliary switch, the activated carbon granules between each pair of partitions are filled with activated carbon granules. When the winding rod rotates, the pulleys work together to drive the one-way threaded screw to rotate synchronously. This drives the piston block to move upward through the second piston plate and the first piston plate. When the filter membrane stops moving, the unused activated carbon granules move to one side of the channel, and the used activated carbon granules are removed. This achieves automatic replacement of activated carbon granules. By automatically replacing activated carbon granules, it can be ensured that there is always fresh and efficient activated carbon in the filter device, thereby continuously providing high-quality filtration and purification effects.

[0017] 4. By setting up the jet assembly, when gas is discharged from the support tube on the left, the filter membrane near the left is rolled up. When the second piston plate moves upward, the piston block, the second piston plate, and the first piston plate form a piston body inside the piston shell. This can push the gas inside the piston shell into the second one-way valve through the air inlet, and then guide it into the exhaust plate through the support tube and exhaust pipe. The gas is then discharged through the filter membrane. When the pressurized gas is discharged into the bottom of the filter membrane, it creates a backwashing effect on the inside of the filter membrane. This backwashing can more effectively remove impurities and particles attached to the inside and surface of the filter membrane, thereby maintaining the permeability and filtration efficiency of the filter membrane. This allows the filter membrane to be used for a long time without replacement, thus improving the overall practicality of the device. Attached Figure Description

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

[0019] Figure 2 This is a schematic diagram of the internal structure of the filter box of the present invention;

[0020] Figure 3 This is a cross-sectional view of the filter box of the present invention;

[0021] Figure 4 This is a schematic diagram of one side of the piston housing structure of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0023] Figure 6 This is a schematic diagram of the internal structure of the piston housing of the present invention;

[0024] Figure 7 This is a schematic diagram of the second piston plate structure of the present invention;

[0025] Figure 8 This is a cross-sectional view of the piston housing of the present invention;

[0026] Figure 9 For the invention Figure 8 Enlarged view at B in the invention;

[0027] Figure 10 For the invention Figure 8 Enlarged view at C in the invention;

[0028] Figure 11 Cross-sectional view of the filter frame of the invention;

[0029] Figure 12 Structure diagram of the air jet assembly of the invention.

[0030] In the figure: 1, bubble water machine; 2, filter box; 3, reflux box; 4, filter frame; 5, filter soft film; 6, driving motor; 7, winding rod; 8, air guide pipe; 9, piston shell; 10, micro electric push rod; 11, partition plate; 12, first piston plate; 13, through slot; 14, second piston plate; 15, piston block; 16, first corrugated hose; 17, one-way threaded screw; 18, belt; 19, belt pulley; 20, communication pipe; 21, sealing cover; 22, piston sleeve; 23, second corrugated hose; 24, first one-way valve; 25, second one-way valve; 26, air inlet; 27, third one-way valve; 28, first piston ring; 29, support pipe; 30, exhaust plate; 31, exhaust pipe; 32, fixed pipe; 33, connecting spring; 34, groove; 35, second piston ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments will be described below according to the overall structure of the present application.

[0033] Please refer to Figures 1-12 The embodiment provides a multi-stage filtering device for a bubble water machine, which comprises a bubble water machine 1 and a reflux tank 3 fixedly connected at the water inlet of the bubble water machine 1, a filter tank 2 fixedly connected at the top of the reflux tank 3, and a filter soft film 5 arranged on the inner side of the filter tank 2; a winding mechanism arranged on the inner side of the filter tank 2 and used for winding the filter soft film 5; a second piston plate 14 arranged on the inner side of the filter tank 2, and a first piston plate 12 fixedly connected to the inner side of the second piston plate 14 through a bolt assembly; the winding mechanism comprises a filter frame 4 fixedly connected to the inner side of the filter tank 2, and the filter soft film 5 passes through the middle of the filter frame 4; two driving motors 6 are mounted at the top of the filter tank 2, one winding rod 7 is fixedly connected to the output end of each driving motor 6, and one end of the winding rod 7 penetrates into the inner side of the filter tank 2 and winds the filter soft film 5;

[0034] Firstly, the inside of the reflux tank 3 can be sequentially distributed from top to bottom with a reverse osmosis filter, a mineralization filter and an ultraviolet sterilization lamp in the longitudinal direction, the reverse osmosis filter removes small particles and microorganisms in water through physical barriers, the mineralization filter further optimizes water quality, removes heavy metals and increases mineral content in water; the post-filter ensures water safety, kills bacteria and viruses in water through ultraviolet rays or other ways, and removes odors and bacteria through the active carbon particles placed in the first piston plate 12, and filters particulate matter in water through the filter soft film 5 arranged at the front end, so as to realize multi-stage filtration of water entering the inside of the bubble water machine 1, thereby improving the cleanliness and taste of water;

[0035] The driving motor 6 can be controlled by the PLC controller to start intermittently. When the filter soft film 5 located inside the filter frame 4 is used for a long time, two driving motors 6 can be started, one driving motor 6 drives one winding rod 7 to wind the filter soft film 5, and the other driving motor 6 drives one winding rod 7 to release the filter soft film 5, so that the filter soft film 5 can move transversely, and the used filter soft film 5 moves to the outside of the filter frame 4, and the new filter soft film 5 moves to the inside of the filter frame 4 for filtering use, so that the continuous and efficient filtering effect is ensured, and the cost and time of manual maintenance are reduced. The user does not need to check and manually replace the soft film regularly, thereby saving time and effort, and further improving the practicability of the device as a whole.

[0036] Please refer to Figures 2-8 The inside of the filter box 2 is provided with an auxiliary switcher for switching the position of the first piston plate 12. The auxiliary switcher comprises a piston shell 9 fixedly connected inside the filter box 2, a second piston plate 14 slidably connected inside the piston shell 9, a piston block 15 fixedly connected to one side of the second piston plate 14 and slidably connected to the inside of the piston shell 9, and a piston body formed by the piston block 15, the second piston plate 14 and the first piston plate 12 inside the piston shell 9. The piston body makes piston movement inside the piston shell 9. The two sides of the piston shell 9 are provided with through grooves 13 in communication with the inside. The top of the filter box 2 is fixedly connected with a sealing cover 21 through a bolt assembly. The auxiliary switcher further comprises a one-way threaded screw rod 17 rotatably connected to the inside of the piston shell 9, and the piston block 15 is threadedly connected to the outer wall of the one-way threaded screw rod 17, and one end of the one-way threaded screw rod 17 penetrates to the top of the piston shell 9. The winding rod 7 and the outer wall of the one-way threaded screw rod 17 are both fixedly connected with a belt pulley 19, and the outer walls of the two belt pulleys 19 are provided with a belt 18. The top and bottom of the piston block 15 are both fixedly connected with a first corrugated hose 16, and one end of the two first corrugated hoses 16 is respectively fixedly connected with the inside bottom and the inside top of the piston shell 9. The one-way threaded screw rod 17 is arranged inside the two first corrugated hoses 16. The front and rear sides of the first piston plate 12 and the front and rear sides of the second piston plate 14 are both composed of multiple filter screens. The inside of the first piston plate 12 is fixedly connected with multiple partitions 11, and the multiple partitions 11 separate the filter screens on the front and rear sides of the first piston plate 12.

[0037] The filled activated carbon particles between every two partitions 11 are driven to rotate synchronously by the cooperation of the belt pulley 19 and the belt pulley 19 when the winding rod 7 rotates, so as to drive the piston block 15 to drive the first piston plate 12 to move upwards through the second piston plate 14. When the filter soft film 5 stops moving, the unused activated carbon particles move to one side of the through groove 13, and the used activated carbon particles are removed, thereby realizing automatic replacement of the activated carbon particles. By automatically replacing the activated carbon particles, it can be ensured that there is always fresh and efficient activated carbon in the filter device, thereby continuously providing high-quality filtering and purifying effect.

[0038] Please refer to Figures 8-12 The jet assembly is located on the inner side of the filter box 2 and is used for flushing the filter soft film 5. The jet assembly comprises two support pipes 29 fixedly connected to the inner side of the filter frame 4. A plurality of exhaust pipes 31 are fixedly connected at the air outlet of each of the two support pipes 29. The plurality of exhaust pipes 31 are fixedly connected through an exhaust plate 30, and the exhaust plate 30 is arranged at the bottom of the filter soft film 5. A second one-way valve 25 is fixedly connected at the air inlet of one of the two support pipes 29, and one end of the second one-way valve 25 penetrates into the interior of the piston shell 9. A piston sleeve 22 is fixedly connected to the inner side of the piston shell 9, and one end of the piston sleeve 22 penetrates into the interior of the filter box 2 and is fixedly connected to the filter box 2. A second corrugated hose 23 is fixedly connected to the end of the piston sleeve 22, and one end of the second corrugated hose 23 is fixedly connected to the inner side of the piston shell 9. An air inlet 26 is formed in the inner side of the piston sleeve 22 and penetrates to the outside. A third one-way valve 27 is fixedly connected at the air inlet of the piston sleeve 22. A micro electric push rod 10 is installed on one side of the filter box 2, and the output end of the micro electric push rod 10 is fixedly connected to a first piston ring 28 which penetrates into the interior of the piston sleeve 22. The first piston ring 28 is slidably connected in the interior of the piston sleeve 22. A sealing ring is arranged between the output end of the piston sleeve 22 and the piston sleeve 22 for sealing the gap therebetween. The jet assembly further comprises a gas guide pipe 8 fixedly connected at the air inlet of the other support pipe 29. Two piston sleeves 22 and two second corrugated hoses 23 are arranged. The two piston sleeves 22 are communicated through a communication pipe 20. A second piston ring 35 is slidably connected in the interior of the other piston sleeve 22, and a connecting spring 33 is arranged between the second piston ring 35 and the piston sleeve 22. A first one-way valve 24 is arranged at the air inlet of the gas guide pipe 8, and one end of the first one-way valve 24 extends into the interior of the second corrugated hose 23. A recess 34 is formed in the inner side of the filter frame 4, and the piston sleeve 22 is fixedly connected to the inner side of the recess 34 and abuts against the top of the filter soft film 5. A fixed pipe 32 is fixedly connected to the inner side of the filter frame 4, and one end of the fixed pipe 32 extends into the interior of the recess 34.

[0039] When the gas is discharged from the inside of the supporting pipe 29 located on the left side, the filter soft film 5 located on the left side is just rolled up, when the second piston plate 14 moves upward, because the piston block 15, the second piston plate 14 and the first piston plate 12 constitute a piston body in the inside of the piston shell 9, the gas in the inside of the piston shell 9 can be pushed into the inside of the second one-way valve 25 through the air inlet 26, and then introduced into the inside of the exhaust plate 30 through the supporting pipe 29 and the exhaust pipe 31, so as to be discharged through the filter soft film 5, when the gas with pressure is discharged into the bottom of the filter soft film 5, the gas with pressure discharged into the bottom of the filter soft film 5 can form a backwashing effect in the inside of the filter soft film 5, this backwashing can more effectively remove the impurities and particles attached to the inside and surface of the filter soft film 5, so as to maintain the permeability and filtering efficiency of the filter soft film 5, so that the filter soft film 5 can be used for a long time without replacement, thereby improving the practicability of the whole device;

[0040] The filter bag for filtering the gas can be installed at the air inlet of the third one-way valve 27, when the second piston plate 14 moves upward, the outside air can be sucked into the inside through the third one-way valve 27 located at the bottom of the piston sleeve 22;

[0041] When the filter soft film 5 is rolled up and operated in reverse, the rolling rod 7 located on the right side is rolled up, the miniature electric push rod 10 can be started, the output end of the miniature electric push rod 10 drives the first piston ring 28 to pass in front of the second one-way valve 25 from the air inlet 26, so as to block the flow communication between the air inlet 26 and the second one-way valve 25, at the same time, the first piston ring 28 advances to form a suction on the inside of the piston sleeve 22 located at the bottom, so that the extrusion force of the connecting spring 33 gradually decreases, so as to drive the second piston ring 35 to reset, so that the second piston ring 35 passes through the air inlet 26 opened in the inside of the piston sleeve 22 located at the bottom, so as to form a barrier between the air inlet 26 and the third one-way valve 27, so that the filter soft film 5 on the other side can be cleaned by air injection during the downward movement of the second piston plate 14;

[0042] The suction pump connected with the outside can be installed on one side of the bubble water machine 1, and the collecting barrel for collecting dirt can be installed, or the output end of the suction pump is connected with the sewage pipe through the pipeline, so that the dirt can be directly discharged.

[0043] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multi-stage filtering device for a sparkling water machine, characterized in that, Include: Bubble water machine (1) and fixedly connected to the backflow tank (3) of the water inlet of the bubble water machine (1), the top of the backflow tank (3) is fixedly connected with the filter box (2), the inner side of the filter box (2) is provided with filter soft film (5); Winding mechanism, located in the inner side of the filter box (2), for winding the filter soft film (5); The second piston plate (14) is arranged in the inner side of the filter box (2), the inner side of the second piston plate (14) is fixedly connected with the first piston plate (12) through the bolt assembly, and the inner side of the filter box (2) is provided with an auxiliary switch for switching the position of the first piston plate (12). Jet assembly, located in the inner side of the filter box (2), for flushing the filter soft film (5); The winding mechanism includes a filter frame (4) fixedly connected to the inner side of the filter box (2), the filter soft film (5) passes through the middle of the filter frame (4), two drive motors (6) are installed on the top of the filter box (2), one winding rod (7) is fixedly connected to the output end of each of the two drive motors (6), and one end of the winding rod (7) penetrates to the inner side of the filter box (2) and winds the filter soft film (5). The auxiliary switch includes a piston shell (9) fixedly connected to the inside of the filter box (2), the second piston plate (14) is slidingly connected to the inside of the piston shell (9), one side of the second piston plate (14) is fixedly connected with a piston block (15), and the piston block (15) is slidingly connected to the inner side of the piston shell (9), the piston block (15), the second piston plate (14) and the first piston plate (12) form a piston body in the inside of the piston shell (9), the piston body does piston movement in the inside of the piston shell (9), the both sides of the piston shell (9) are provided with through grooves (13) communicating with the inside, and the top of the filter box (2) is fixedly connected with a sealing cover (21) through a bolt assembly. The auxiliary switch further includes a one-way threaded screw rod (17) rotatingly connected to the inner side of the piston shell (9), the piston block (15) is threadedly connected to the outer wall of the one-way threaded screw rod (17), one end of the one-way threaded screw rod (17) penetrates to the top of the piston shell (9), one belt pulley (19) is fixedly connected to the outer wall of the one-way threaded screw rod (17) and the winding rod (7), the outer wall of the two belt pulleys (19) is provided with a belt (18), a first corrugated hose (16) is fixedly connected to the top and the bottom of the piston block (15), one end of the two first corrugated hoses (16) is fixedly connected to the inner bottom and the inner top of the piston shell (9) respectively, and the one-way threaded screw rod (17) is arranged in the inner side of the two first corrugated hoses (16).

2. The multi-stage filtering device for a sparkling water machine according to claim 1, characterized in that, The front and back sides of the first piston plate (12) and the front and back sides of the second piston plate (14) are composed of multiple filter screens, the inner side of the first piston plate (12) is fixedly connected with multiple partitions (11), and the multiple partitions (11) separate the filter screens on the front and back sides of the first piston plate (12).

3. The multi-stage filtering device for a sparkling water machine according to claim 2, characterized in that, The air injection assembly comprises two support pipes (29) fixedly connected to the inner side of the filter frame (4), multiple exhaust pipes (31) fixedly connected to the air outlet of each of the two support pipes (29), multiple exhaust pipes (31) fixedly connected through an exhaust plate (30), and the exhaust plate (30) arranged at the bottom of the filter soft film (5). The air inlet of one of the support pipes (29) is fixedly connected with a second one-way valve (25), one end of the second one-way valve (25) penetrates into the interior of the piston shell (9), the inner side of the piston shell (9) is fixedly connected with a piston sleeve (22), one end of the piston sleeve (22) penetrates into the interior of the filter box (2) and is fixedly connected with the filter box (2), the end of the piston sleeve (22) is fixedly connected with a second corrugated hose (23), one end of the second corrugated hose (23) is fixedly connected to the inner side of the piston shell (9), the inner side of the piston sleeve (22) is provided with an air inlet (26) penetrating to the outside, the air inlet of the piston sleeve (22) is fixedly connected with a third one-way valve (27), one side of the filter box (2) is provided with a micro electric push rod (10), the output end of the micro electric push rod (10) penetrates into the interior of the piston sleeve (22) and is fixedly connected with a first piston ring (28), the first piston ring (28) is slidingly connected in the interior of the piston sleeve (22), and a sealing ring is arranged between the output end of the micro electric push rod (10) and the piston sleeve (22) to seal the gap therebetween.

4. The multi-stage filtering device for a sparkling water machine according to claim 3, characterized in that, The air injection assembly further comprises a gas guide pipe (8) fixedly connected to the air inlet of the other support pipe (29), the piston sleeve (22) and the second corrugated hose (23) are both provided with two, the two piston sleeves (22) are communicated through a communication pipe (20), the interior of the other piston sleeve (22) is slidingly connected with a second piston ring (35), a connecting spring (33) is arranged between the second piston ring (35) and the piston sleeve (22), a first one-way valve (24) is arranged at the air inlet of the gas guide pipe (8), and one end of the first one-way valve (24) extends into the interior of the second corrugated hose (23).

5. The multi-stage filtering device for a sparkling water machine according to claim 1, characterized in that, The inner side of the filter frame (4) is provided with a groove (34), the inner side of the groove (34) is fixedly connected with a piston sleeve (22), and the piston sleeve (22) is attached to the top of the filter soft film (5), the inner side of the filter frame (4) is fixedly connected with a fixed pipe (32), and one end of the fixed pipe (32) extends into the interior of the groove (34).

Images