Household air purifier capable of circularly disinfecting

Abstract

The invention discloses a household air purifier capable of circularly disinfecting, and belongs to the field of air purifiers. Comprising a liquid storage box, a purification box is integrally formed at the top of the liquid storage box, a purification cylinder is integrally formed on the lower surface in the purification box, a partition plate is fixedly connected to the position, located at the top of the purification cylinder, in the purification box, and a collection cylinder is integrally formed at the position, located at the top of the partition plate, of the top of the purification cylinder; an air inlet pipe is fixedly communicated with the outer side wall of the collecting cylinder and located on the outer side of the purifying box; the right side of the liquid storage tank is fixedly connected with a mounting plate, the upper surface of the mounting plate is fixedly connected with a circulating pump, the circulating pump is used for pumping liquid for purifying air in the liquid storage tank, and the pumped liquid can be sprayed out through a plurality of atomization nozzles to mix and purify the air pumped into the purification cylinder, so that the air purification effect is achieved; and meanwhile, the surfaces of the exhaust fan blades can be washed.

Description

Technical Field

[0001] The invention relates to the field of air purifiers, and in particular to a household air purifier capable of cyclic disinfection. Background Art

[0002] Air purifiers, also known as "air cleaners", air fresheners, and purifiers, refer to home appliances that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), effectively improving air cleanliness. They are mainly divided into household, commercial, industrial, and building applications; Patent: CN112128876B relates to the field of air purification technology, and discloses an air purifier, including a purification box and a sweeping mechanism, the purification box is connected to a connecting mechanism and is connected to the sweeping mechanism through the connecting mechanism, the interior of the purification box is fixedly provided with a plurality of partitions and is divided into a negative ion chamber, a storage chamber, a discharge chamber and a water storage chamber from top to bottom through the plurality of partitions, the side wall of the water storage chamber is fixedly connected with a plurality of evenly distributed air suction pipes, and one end of the plurality of air suction pipes located inside the water storage chamber is fixedly connected with a connecting pipe. The air purifier can not only immediately adsorb and purify the dust generated when sweeping the floor, but also has a large adsorption range, and can automatically reciprocate and flush the dust filter net cover to prevent it from being blocked, thereby improving the convenience of cleaning, and at the same time can reuse the flushing water to reduce the waste of water resources, and can evenly disperse the negative ions into the air to improve the dispersion effect of the negative ions; The above technology requires multiple fans to achieve gas purification, which consumes a lot of electricity. In addition, the purified gas discharged in the above technology is unevenly distributed and needs to be improved. For this reason, we propose a household air purifier that can be circulated and disinfected. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an air purifier with low power consumption; another purpose of the present invention is to provide an air purifier that can discharge purified gas more evenly.

[0004] Technical solution: A household air purifier capable of cyclic disinfection, comprising a liquid storage tank, a purification box is integrally formed on the top of the liquid storage tank, a purification cylinder is integrally formed on the lower surface of the interior of the purification box, a partition is fixedly connected to the top of the purification cylinder inside the purification box, a collecting cylinder is integrally formed on the top of the partition, and an outer wall of the collecting cylinder is located on the outside of the purification box and is fixedly connected to an air inlet pipe; A mounting plate is fixedly connected to the right side of the liquid storage tank, a circulating pump is fixedly connected to the upper surface of the mounting plate, an input end of the circulating pump is connected to the interior of the liquid storage tank, an output end of the circulating pump is fixedly connected to an infusion tube, a top end of the infusion tube is located inside the purification box and is fixedly connected to a hose, and a top end of the hose passes through the interior of the purification cylinder; An exhaust pipe is embedded and fixed on the top of the purification box, a motor is arranged on the upper surface of the purification box, the bottom end of the output shaft of the motor is located inside the exhaust pipe and is fixedly connected to a shaft rod 1, the outer wall of the shaft rod 1 is located inside the shaft rod 1 and is fixedly connected to an exhaust fan blade, and the bottom end of the shaft rod 1 is fixedly connected to a bevel gear 1; The upper surface of the collecting cylinder is rotatably connected to a second bevel gear via a rotating shaft, the center of the lower surface of the second bevel gear is located inside the purification cylinder and is fixedly connected to a second shaft rod, and the bottom end of the second shaft rod is fixedly connected to an exhaust fan blade; The right side of the interior of the purification box is fixedly connected with an axle rod three, the left end of the axle rod three is rotatably connected with a bevel gear three via a rotating shaft, and the bevel gear one and the bevel gear two are both meshed and connected with the bevel gear three.

[0005] Furthermore, a drain cylinder is symmetrically fixedly connected to the inner upper surface of the liquid storage tank, the top of the drain cylinder is fixedly connected to the top of the purification cylinder, the bottom of the drain cylinder is located outside the liquid storage tank and is fixedly connected to a drain pipe, the opposite ends of the two drain pipes are fixedly connected to a filter box, and the bottom of the filter box is located inside the liquid storage tank and is fixedly connected to a reflux pipe.

[0006] Furthermore, the filter box is a hollow rectangular parallelepiped structure with an open front surface, a filter screen is engaged inside the filter box, and a sealing cover plate is fixedly connected to the front surface of the filter screen.

[0007] Furthermore, a plurality of L-shaped air outlet pipes are integrally formed below the outer side wall of the purification cylinder.

[0008] Furthermore, the upper surface of the purification box is located on the outside of the exhaust pipe and is fixedly connected to a plurality of vertical rods, the top ends of the plurality of vertical rods are commonly fixedly connected to a top plate, the upper surface of the top plate is fixedly connected to the lower surface of the motor, and the outer side wall of the output shaft of the motor is located below the top plate and is fixedly connected to a guide vane.

[0009] Furthermore, connecting blocks are symmetrically fixedly connected on both sides of the purification box, and the opposite sides of the two connecting blocks are commonly fixedly connected with an annular tube 1, and the outer side wall of the annular tube 1 is integrally formed with multiple air inlet nozzles, and the bottom end of the air inlet pipe is fixedly connected to the upper surface of the annular tube 1.

[0010] Furthermore, the top end of the hose is located inside the purification cylinder and is fixedly connected to an annular tube 2, and the inside of the annular tube 2 is fixedly connected to a plurality of atomizing nozzles.

[0011] Furthermore, the outer wall of the shaft rod 2 is fixedly connected with a cam, the upper surface of the annular tube 2 is fixedly connected with a plurality of branch tubes, the top ends of the plurality of branch tubes are commonly fixedly connected with a movable ring, the upper surface of the movable ring is provided with a plurality of through-type arc-shaped openings, the inner part of the arc-shaped openings is slidably connected with a sliding block, a spring is fixedly connected between the sliding block and the arc-shaped opening, the upper surfaces of the plurality of sliding blocks are commonly fixedly connected with a fixed ring, the outer wall of the fixed ring is fixedly connected to the inner side of the purification cylinder, the lower surface of the sliding block is fixedly connected with a rotating connecting piece 1, the outer wall of the rotating connecting piece 1 is rotatably connected with a traction rod 1 via a rotating shaft, the bottom end of the traction rod 1 is rotatably connected with the traction rod 2 via a rotating shaft, the top end of the traction rod 2 is rotatably connected with a rotating connecting piece 2 via a rotating shaft, and the upper surface of the rotating connecting piece 2 is fixedly connected to the lower surface of the movable ring.

[0012] Furthermore, a negative ion generator is fixedly connected to the left side of the inner upper surface of the purification box, and a power supply device is fixedly connected to the left side of the inner part of the purification box. Beneficial Effects

[0013] The circulation pump is used to extract the liquid used for air purification in the liquid storage tank. The extracted liquid will be sprayed out through multiple atomizing nozzles to mix and purify the air drawn into the purification cylinder, thereby achieving the air purification effect, and at the same time, the surface of the exhaust fan blade can be washed; When the motor is started and the shaft rod 2 rotates, the cam will rotate together, so that the cam can squeeze the traction rod 1 and the traction rod 2, so that the movable ring slides along the outer side of the sliding block through the arc-shaped opening, and then under the connection of multiple branch pipes, the annular pipe 2 rotates slightly, so that the spray range of the atomizing nozzle is wider, and the purification effect is better; When the motor is started, it can drive both the suction fan blades and the exhaust fan blades to rotate, so that the exhaust fan blades draw external air into the purification cylinder, and the exhaust fan blades can discharge the purified gas inside the purification cylinder to the outside of the device. After the exhaust gas is rotated and guided by the guide blades, it can be more evenly distributed in the room. At the same time, by starting a motor, the suction fan blades and the exhaust fan blades are controlled to rotate together to control the air intake and exhaust, which is more energy-saving than requiring two fans to control the air intake and exhaust. After the liquid entering the purification cylinder purifies the air, it will flow into the filter box through the discharge cylinder and the discharge pipe, and then flow back into the liquid storage tank after being filtered through the filter net, so that the circulation pump can circulate and extract liquid to purify the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the connection structure of the motor, the shaft rod 1, the exhaust fan blades, the guide blades and the bevel gear 1 of the present invention; Figure 4 It is a schematic diagram of the connection structure of the shaft rod 2, the bevel gear 2, the fixed ring, the movable ring, the annular tube 2 and the exhaust fan blades of the present invention; Figure 5 It is a schematic diagram of the top view of the movable ring of the present invention; Figure 6 It is a schematic diagram of the structure of the movable ring of the present invention when viewed from above.

[0015] In the figure: 1, liquid storage tank; 2, purification box; 3, purification cylinder; 4, partition; 5, collection cylinder; 6, air inlet pipe; 7, mounting plate; 8, circulation pump; 9, infusion pipe; 10, hose; 11, exhaust cylinder; 12, motor; 13, shaft rod 1; 14, exhaust fan blade; 15, bevel gear 1; 16, bevel gear 2; 17, shaft rod 2; 18, shaft rod 3; 19, bevel gear 3; 20, drainage cylinder; 21, drainage pipe; 22, filter box; 23, return pipe; 24, filter screen; 25, sealing cover plate; 26 , L-shaped air outlet pipe; 27, vertical rod; 28, top plate; 29, guide blade; 30, connecting block; 31, annular tube 1; 32, annular tube 2; 33, atomizing nozzle; 34, cam; 35, branch pipe; 36, movable ring; 37, arc-shaped mouth; 38, sliding block; 39, spring; 40, fixed ring; 41, rotating connecting piece 1; 42, traction rod 1; 43, traction rod 2; 44, rotating connecting piece 2; 45, negative ion generator; 46, power supply device; 47, exhaust fan blade; 48, air inlet nozzle. DETAILED DESCRIPTION

[0016] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1

[0017] like Figure 1 and Figure 2 As shown, a household air purifier capable of cyclic disinfection is provided, comprising a liquid storage tank 1, a purification box 2 is integrally formed on the top of the liquid storage tank 1, a purification cylinder 3 is integrally formed on the lower surface of the interior of the purification box 2, a partition 4 is fixedly connected to the top of the purification cylinder 3 inside the purification box 2, a collecting cylinder 5 is integrally formed on the top of the purification cylinder 3 located on the top of the partition 4, and an outer wall of the collecting cylinder 5 is located on the outside of the purification box 2 and is fixedly connected to an air inlet pipe 6; The two sides of the purification box 2 are symmetrically fixedly connected with connecting blocks 30, and the opposite sides of the two connecting blocks 30 are commonly fixedly connected with an annular tube 31, and the outer wall of the annular tube 31 is integrally formed with a plurality of air inlet nozzles 48, and the bottom end of the air inlet pipe 6 is fixedly connected to the upper surface of the annular tube 31; When the device is pumping air, air will be taken in through the multiple air inlet nozzles 48 on the outer wall of the annular tube 31, with a wider air intake range, and then passed into the purification cylinder 3 for purification.

[0018] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a mounting plate 7 is fixedly connected to the right side of the liquid storage tank 1, a circulating pump 8 is fixedly connected to the upper surface of the mounting plate 7, an input end of the circulating pump 8 is connected to the interior of the liquid storage tank 1, an output end of the circulating pump 8 is fixedly connected to a liquid infusion tube 9, a top end of the liquid infusion tube 9 is located inside the purification box 2 and is fixedly connected to a hose 10, and a top end of the hose 10 passes through the interior of the purification cylinder 3; The top end of the hose 10 is located inside the purification cylinder 3 and is fixedly connected to a second annular tube 32, and the inside of the second annular tube 32 is fixedly connected to a plurality of atomizing nozzles 33; The circulation pump 8 is used to extract the liquid for air purification inside the liquid storage tank 1. The extracted liquid will be sprayed out through multiple atomizing nozzles 33 to mix and purify the air drawn into the purification cylinder 3, thereby achieving the air purification effect, and at the same time, the surface of the exhaust fan blade 47 can be washed; The outer side wall of the shaft rod 17 is fixedly connected with a cam 34; A plurality of branch pipes 35 are fixedly connected to the upper surface of the annular tube 32, and a movable ring 36 is fixedly connected to the top ends of the plurality of branch pipes 35. A plurality of through-type arc-shaped openings 37 are opened on the upper surface of the movable ring 36, and a sliding block 38 is slidably connected inside the arc-shaped opening 37. A spring 39 is fixedly connected between the sliding block 38 and the arc-shaped opening 37. A fixing ring 40 is fixedly connected to the upper surfaces of the plurality of sliding blocks 38, and the outer wall of the fixing ring 40 is fixedly connected to the inner side of the purification cylinder 3. The lower surface of the sliding block 38 is fixedly connected with a rotating connecting piece 1 41, the outer side wall of the rotating connecting piece 1 41 is rotatably connected with a traction rod 1 42 via a rotating shaft, the bottom end of the traction rod 1 42 is rotatably connected with a traction rod 2 43 via a rotating shaft, the top end of the traction rod 2 43 is rotatably connected with a rotating connecting piece 2 44 via a rotating shaft, and the upper surface of the rotating connecting piece 2 44 is fixedly connected to the lower surface of the movable ring 36; When the motor 12 is started and the shaft rod 17 rotates, the cam 34 will rotate together, so that the traction rod 1 42 and the traction rod 2 43 can be squeezed by the cam 34, so that the movable ring 36 slides along the outside of the sliding block 38 through the arc-shaped opening 37, and then under the connection of multiple branch pipes 35, the annular pipe 2 32 rotates slightly, and then the spray range of the atomizing nozzle 33 is wider, so that the purification effect is better.

[0019] like Figure 3 and Figure 4 As shown, an exhaust pipe 11 is embedded and fixed on the top of the purification box 2, and a motor 12 is arranged on the upper surface of the purification box 2. The bottom end of the output shaft of the motor 12 is located inside the exhaust pipe 11 and is fixedly connected to a shaft rod 13. The outer wall of the shaft rod 13 is located inside the shaft rod 13 and is fixedly connected to an exhaust fan blade 14. The bottom end of the shaft rod 13 is fixedly connected to a bevel gear 15. The upper surface of the collecting cylinder 5 is rotatably connected to a bevel gear 16 via a rotating shaft, and the center of the lower surface of the bevel gear 16 is located inside the purification cylinder 3 and fixedly connected to a shaft rod 17, and the bottom end of the shaft rod 17 is fixedly connected to an exhaust fan blade 47; The upper surface of the purification box 2 is located outside the exhaust pipe 11 and is fixedly connected to a plurality of vertical rods 27, and the top ends of the plurality of vertical rods 27 are commonly fixedly connected to a top plate 28, and the upper surface of the top plate 28 is fixedly connected to the lower surface of the motor 12, and the outer side wall of the output shaft of the motor 12 is located below the top plate 28 and is fixedly connected to a guide vane 29; The right side of the interior of the purification box 2 is fixedly connected with a shaft rod 3 18, and the left end of the shaft rod 3 18 is rotatably connected with a bevel gear 3 19 through a rotating shaft, and the bevel gear 1 15 and the bevel gear 2 16 are both meshed and connected with the bevel gear 3 19; When the motor 12 is started, it can drive the suction fan blades 47 and the exhaust fan blades 14 to rotate, so that the exhaust fan blades 14 draw external air into the purification tube 3. The exhaust fan blades 14 can discharge the purified gas inside the purification tube 3 to the outside of the device, and the exhausted gas can be more evenly distributed in the room after being rotated and guided by the guide blades 29. At the same time, by starting a motor 12, the suction fan blades 47 and the exhaust fan blades 14 are controlled to rotate together to control the air intake and exhaust. This is more energy-saving than requiring two fans to control the air intake and exhaust.

[0020] like Figure 1 and Figure 2 As shown, a drain cylinder 20 is symmetrically fixedly connected to the inner upper surface of the liquid storage tank 1, the top of the drain cylinder 20 is fixedly connected to the top of the purification cylinder 3, the bottom of the drain cylinder 20 is located outside the liquid storage tank 1 and is fixedly connected to a drain pipe 21, the opposite ends of the two drain pipes 21 are fixedly connected to a filter box 22, and the bottom of the filter box 22 is located inside the liquid storage tank 1 and is fixedly connected to a reflux pipe 23; The filter box 22 is a hollow rectangular parallelepiped structure with an open front surface. A filter screen 24 is engaged inside the filter box 22, and a sealing cover plate 25 is fixedly connected to the front surface of the filter screen 24. After the liquid entering the purification cylinder 3 purifies the air, it will flow into the filter box 22 through the discharge cylinder 20 and the discharge pipe 21, and then flow into the liquid storage tank 1 again after being filtered through the filter net 24, so that the circulation pump 8 can circulate and extract liquid to purify the air.

[0021] like Figure 2 As shown, a plurality of L-shaped air outlet pipes 26 are integrally formed below the outer side wall of the purification cylinder 3; Used to exhaust purified air.

[0022] like Figure 2 As shown, a negative ion generator 45 is fixedly connected to the left of the inner upper surface of the purification box 2, and a power supply device 46 is fixedly connected to the left of the inner part of the purification box 2; Negative ions can be introduced into the air by means of the provided negative ion generator 45, and the power supply device 46 provides electricity for the entire device.

[0023] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A household air purifier capable of cyclic disinfection, comprising a liquid storage tank (1), characterized in that: The top of the liquid storage tank (1) is integrally formed with a purification box (2), the lower surface of the interior of the purification box (2) is integrally formed with a purification cylinder (3), the interior of the purification box (2) is located at the top of the purification cylinder (3) and is fixedly connected to a partition (4), the top of the purification cylinder (3) is located at the top of the partition (4) and is integrally formed with a collection cylinder (5), the outer wall of the collection cylinder (5) is located at the outside of the purification box (2) and is fixedly connected to an air intake pipe (6); The right side of the liquid storage tank (1) is fixedly connected to a mounting plate (7), the upper surface of the mounting plate (7) is fixedly connected to a circulation pump (8), the input end of the circulation pump (8) is connected to the interior of the liquid storage tank (1), the output end of the circulation pump (8) is fixedly connected to a liquid infusion tube (9), the top end of the liquid infusion tube (9) is located inside the purification box (2) and is fixedly connected to a hose (10), the top end of the hose (10) passes through the interior of the purification cylinder (3); An exhaust pipe (11) is embedded and fixed on the top of the purification box (2), and a motor (12) is arranged on the upper surface of the purification box (2). The bottom end of the output shaft of the motor (12) is located on the inner side of the exhaust pipe (11) and is fixedly connected to a shaft rod 1 (13). The outer wall of the shaft rod 1 (13) is located on the inner side of the shaft rod 1 (13) and is fixedly connected to an exhaust fan blade (14). The bottom end of the shaft rod 1 (13) is fixedly connected to a bevel gear 1 (15). The upper surface of the collecting cylinder (5) is rotatably connected to a second bevel gear (16) via a rotating shaft, and the center of the lower surface of the second bevel gear (16) is located inside the purification cylinder (3) and is fixedly connected to a second shaft rod (17), and the bottom end of the second shaft rod (17) is fixedly connected to an exhaust fan blade (47); The right side of the interior of the purification box (2) is fixedly connected to a shaft rod three (18), the left end of the shaft rod three (18) is rotatably connected to a bevel gear three (19) via a rotating shaft, and the bevel gear one (15) and the bevel gear two (16) are both meshedly connected to the bevel gear three (19).

2. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: A drainage cylinder (20) is symmetrically fixedly connected to the internal upper surface of the liquid storage tank (1); the top of the drainage cylinder (20) is fixedly connected to the top of the purification cylinder (3); the bottom of the drainage cylinder (20) is located outside the liquid storage tank (1) and is fixedly connected to a drainage pipe (21); the opposite ends of the two drainage pipes (21) are fixedly connected to a filter box (22); the bottom of the filter box (22) is located inside the liquid storage tank (1) and is fixedly connected to a return pipe (23).

3. A household air purifier capable of cyclic disinfection according to claim 2, characterized in that: The filter box (22) is a hollow rectangular parallelepiped structure with an open front surface. A filter screen (24) is engaged inside the filter box (22), and a sealing cover plate (25) is fixedly connected to the front surface of the filter screen (24).

4. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: A plurality of L-shaped air outlet pipes (26) are integrally formed below the outer side wall of the purification cylinder (3).

5. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: The upper surface of the purification box (2) is located outside the exhaust pipe (11) and is fixedly connected to a plurality of vertical rods (27); the top ends of the plurality of vertical rods (27) are commonly fixedly connected to a top plate (28); the upper surface of the top plate (28) is fixedly connected to the lower surface of the motor (12); and the outer side wall of the output shaft of the motor (12) is located below the top plate (28) and is fixedly connected to a guide vane (29).

6. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: The two sides of the purification box (2) are symmetrically fixedly connected with connection blocks (30), and the opposite sides of the two connection blocks (30) are commonly fixedly connected with an annular tube (31), and the outer side wall of the annular tube (31) is integrally formed with a plurality of air inlet nozzles (48), and the bottom end of the air inlet pipe (6) is fixedly connected to the upper surface of the annular tube (31).

7. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: The top end of the hose (10) is located inside the purification cylinder (3) and is fixedly connected to an annular tube 2 (32), and the inside of the annular tube 2 (32) is fixedly connected to a plurality of atomizing nozzles (33).

8. A household air purifier capable of cyclic disinfection according to claim 7, characterized in that: The outer wall of the second shaft rod (17) is fixedly connected to a cam (34); the upper surface of the second annular tube (32) is fixedly connected to a plurality of branch tubes (35); the top ends of the plurality of branch tubes (35) are fixedly connected to a movable ring (36); the upper surface of the movable ring (36) is provided with a plurality of through-type arc-shaped openings (37); the interior of the arc-shaped openings (37) is slidably connected to a sliding block (38); a spring (39) is fixedly connected between the sliding block (38) and the arc-shaped opening (37); the upper surfaces of the plurality of sliding blocks (38) are fixedly connected to a fixed ring ( 40), the outer wall of the fixed ring (40) is fixedly connected to the inner side of the purification cylinder (3), the lower surface of the sliding block (38) is fixedly connected to a rotating connecting piece 1 (41), the outer wall of the rotating connecting piece 1 (41) is rotatably connected to a traction rod 1 (42) via a rotating shaft, the bottom end of the traction rod 1 (42) is rotatably connected to a traction rod 2 (43) via a rotating shaft, the top end of the traction rod 2 (43) is rotatably connected to a rotating connecting piece 2 (44) via a rotating shaft, and the upper surface of the rotating connecting piece 2 (44) is fixedly connected to the lower surface of the movable ring (36).

9. A household air purifier capable of cyclic disinfection according to claim 1, characterized in that: A negative ion generator (45) is fixedly connected to the left side of the internal upper surface of the purification box (2), and a power supply device (46) is fixedly connected to the left side of the internal surface of the purification box (2).

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