A plasma cleaning device for the interior of a storage tank and a method of use thereof

Abstract

The present invention discloses a plasma cleaning device for the interior of a storage tank and a method for using the device. The device belongs to the field of plasma cleaning and includes a cover plate, an exhaust pipe and a gas supply pipe mounted on the cover plate, and a one-way valve mounted on the exhaust pipe. A circulation mechanism is provided on the lower surface of the cover plate, the circulation mechanism being used to drive the circulation of gas within the storage tank. The circulation mechanism comprises a tube mounted on the lower surface of the cover plate, the side wall of the tube having evenly distributed first exhaust holes formed near the upper end, and a first sleeve sleeved on the side surface of the tube near the upper end. The circulation mechanism can drive the working gas within the storage tank to circulate, and while the working gas circulates, the ionization mechanism repeatedly ionizes the working gas, causing it to form plasma and continue to ionize to form glow plasma. The resulting glow plasma further enhances the cleaning effect of the interior of the storage tank.

Description

Technical Field

[0001] The present invention relates to the field of plasma cleaning, and more particularly to a plasma cleaning device for the interior of a storage tank and a method for using the same. Background Art

[0002] Plasma, also known as plasma, is an ionized gas composed of positive and negative ions produced by the ionization of atoms and atomic clusters stripped of some of their electrons. This macroscopically neutral ionized gas, with a scale greater than the Debye length, exhibits significant collective behavior, primarily governed by electromagnetic forces. Advances in plasma physics have provided new technologies and techniques for the further development of materials, energy, information, environmental space, space physics, and geophysics.

[0003] In daily life, people generally use ionized plasma to clean the surface of objects, such as cleaning semiconductor devices, optical components, biomedical equipment, metal products and polymer materials. Through plasma cleaning, pollutants on the surface of objects that are invisible to the naked eye can be cleaned away. When using different gases for ionization, the properties of the surface of the object can also be changed while cleaning. For example, when cleaning a storage tank containing liquids, the inner wall of the storage tank can be changed by cleaning the inner wall of the storage tank with plasma, so that the inner wall of the storage tank has less adhesion to the liquid, making it hydrophobic, and to a certain extent, it can reduce the corrosion of the liquid on the inner wall of the storage tank.

[0004] The plasma cleaning method in the prior art is to first place the object to be cleaned in a relatively vacuum space, and then introduce a working gas into the space. The working gas can be oxygen, argon, nitrogen, hydrogen, helium, etc., and the appropriate working gas is selected according to the object to be cleaned. The working gas is then ionized in the space, and the plasma is used to clean the surface of the object in the space. The specific cleaning method, such as the plasma cleaning equipment with a cleaning chamber for semiconductor panels disclosed in the prior art, has the authorization announcement: CN101980798B.

[0005] In order to improve the cleaning effect of the surface of an object in the prior art, a plasma cleaning system is disclosed in a Chinese patent, with the authorization announcement number: CN114453345B. Plasma is introduced into a closed space to clean the objects placed in the space. While the plasma cleans the surface of the object, the plasma is ionized again to form a glow plasma to enhance the cleaning effect of the surface of the object placed in the space. Although the cleaning effect of the surface of the object is improved to a certain extent, the motor drives the connecting rod and the fixed frame to rotate to achieve the purpose of disturbing the gas flow in the space. However, the disturbed airflow effect causes the gas flow to slow down, affecting the efficiency of the plasma ionization again, leaving room for further improvement in the efficiency of cleaning the surface of the object.

[0006] In view of this, in order to address the above-mentioned deficiencies, the present invention improves and optimizes the plasma cleaning device in the prior art, and develops a plasma cleaning device for the interior of a storage tank and a method for using the same. Summary of the Invention

[0007] In response to the problems existing in the prior art, the purpose of the present invention is to provide a plasma cleaning device for the interior of a storage tank and a method for use, which can realize the circulation of the working gas inside the storage tank driven by a circulation mechanism. While circulating, the working gas is repeatedly ionized by an ionization mechanism, so that after forming a plasma, it continues to ionize to form a glow plasma, and the glow plasma formed can further improve the cleaning effect of the interior of the storage tank.

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A plasma cleaning device for the interior of a storage tank and a method for using the device include a cover plate, an air extraction pipe and an air delivery pipe are mounted on the cover plate, and a one-way valve is mounted on the air extraction pipe;

[0010] A circulation mechanism is provided on the lower surface of the cover plate, and the circulation mechanism is used to drive the circulation of gas in the storage tank. The circulation mechanism is a barrel installed on the lower surface of the cover plate, and the side wall of the barrel is provided with evenly distributed first exhaust holes near the upper end. The side surface of the barrel is sleeved with a first sleeve near the upper end, and a group of second exhaust holes are provided on the side wall of the first sleeve. An ionization mechanism is provided on the right side of the second exhaust hole.

[0011] Furthermore, the circulation mechanism further comprises a fan, which is installed inside the bobbin near the upper end.

[0012] Furthermore, the circulation mechanism is that the upper surface of the cover is rotatably connected to the second gear, one side of the second gear is meshed with the first gear, the upper end of the first gear is fixedly connected to the motor, the side surface of the motor is fixedly connected to the mounting seat, the lower end of the mounting seat is fixedly connected to the upper surface of the cover, the upper end of the bobbin passes through the cover and is fixedly connected to the second gear, and the inner wall of the bobbin is fixedly connected to a fan blade near the lower end.

[0013] Furthermore, the circulation mechanism is that the upper surface of the cover plate is rotatably connected to the second gear, one side of the second gear is meshedly connected to the first gear, the upper end of the first gear is fixedly connected to the motor, the side surface of the motor is fixedly connected to the mounting seat, the lower end of the second gear is fixedly connected to the rotating rod, the lower end of the rotating rod passes through the cover plate and extends to the interior of the bobbin, the lower end of the rotating rod is fixedly connected to the reciprocating screw, the side surface of the reciprocating screw is threadedly connected to the threaded sleeve, the side surface of the threaded sleeve is fixedly connected to a flat plate, the flat plate is penetrated by an air vent, the upper surface of the flat plate is rotatably connected to a cover plate, and the bobbin is a square tube.

[0014] Furthermore, the ionization mechanism is provided with a cathode column on the right side of the second exhaust hole, and the cathode column has a conical structure design at one end facing the second exhaust hole. The outside of the cathode column is provided with an anode ring, and the outside of the anode ring is provided with a cathode ring. A first conductive column is fixedly connected to the side surface of the cathode column, and the upper end of the first conductive column sequentially penetrates the anode ring and the cathode ring and is fixedly connected to the lower surface of the cover plate. The cathode ring is electrically connected to the first conductive column, and a second conductive column is fixedly connected to the side surface of the anode ring, and the upper end of the second conductive column penetrates the cathode ring and is fixedly connected to the cover plate.

[0015] Furthermore, conductive sheets are fixedly connected to both the inner and outer side walls of the anode ring, and the ends of the conductive sheets do not contact the cathode column or the cathode ring.

[0016] Furthermore, a second sleeve is fixedly connected to the side surface of the first sleeve, the ionization mechanism is arranged in the second sleeve, and the upper end of the second sleeve is provided with evenly distributed third exhaust holes.

[0017] Furthermore, the rotating rod is a telescopic rod, the tubes are in multiple groups, and are nested in pairs. The inner wall diameter of the upper end of the tube is smaller than the inner wall diameter of the lower end, and the outer wall diameter of the upper end of the tube is smaller than the outer wall diameter of the lower end.

[0018] Furthermore, a barrier piece is fixedly connected to the side wall of the rotating rod near the lower end, a circular ring sleeve is rotatably connected to the outside of the barrier piece, a support rod is fixedly connected to the side wall of the circular ring sleeve, and one end of the support rod is fixedly connected to the inner wall of the barrel.

[0019] The present invention also provides a method for using the plasma cleaning device for the interior of the storage tank, comprising the following steps:

[0020] S1: Injecting gas: First, cover the upper end of the tank with a cover plate and seal it. Then, extract the air inside the tank through the exhaust pipe. When the air is extracted to a relative vacuum state, input the working gas into the tank through the gas pipe.

[0021] S2: Circulating ionization: Turn on the ionization mechanism and the circulation mechanism at the same time. The circulation mechanism will drive the working gas stored inside to circulate. While the working gas is circulating, it will continuously pass through the ionization mechanism. The ionization mechanism will continuously ionize the working gas to form plasma, and the plasma gas formed will be used to clean the inner wall of the storage tank;

[0022] S3: Improve ionization: The plasma is driven to circulate inside the tank through the circulation mechanism. While flowing, the plasma is ionized again through the ionization mechanism to form a glow plasma to improve the cleaning effect of the inner wall of the tank.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) This scheme drives the working gas inside the storage tank to circulate through a circulation mechanism. While circulating, the working gas is repeatedly ionized by an ionization mechanism so that after forming plasma, it continues to ionize to form glow plasma. The glow plasma formed can further improve the cleaning effect of the inside of the storage tank.

[0025] (2) This solution circulates the working gas inside the storage tank through three different circulation methods. This allows different circulation methods to be used for different types of storage tanks, greatly improving the scope of application of the present invention.

[0026] (3) In this scheme, the plasma ionized by the ionization mechanism will be discharged from the third exhaust hole, so that the plasma will spread downward as a whole at the upper end of the storage tank without the problem of local downward spreading. Through such operation, the working gas can be ionized into plasma first, avoiding the problem of working gas mixed in the plasma due to local downward spreading.

[0027] (4) This solution can increase the contact area between the anode ring and the flowing working gas by installing a conductive sheet, thereby greatly improving the ionization efficiency of the flowing gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an appearance view of the overall structure of the present invention;

[0029] Figure 2 A cross-sectional view of the circulation mechanism of the present invention Figure 1 ;

[0030] Figure 3 A cross-sectional view of the circulation mechanism of the present invention Figure 2 ;

[0031] Figure 4 A cross-sectional view of the circulation mechanism of the present invention Figure 3 ;

[0032] Figure 5 A diagram showing the ionization mechanism of the present invention;

[0033] Figure 6 A side view showing the ionization mechanism of the present invention;

[0034] Figure 7 For the present invention Figure 4 A magnified view of point A in the middle;

[0035] Figure 8 This is a three-dimensional view of the second sleeve and the connecting component of the present invention.

[0036] Description of the numbers in the figure:

[0037] 1. Cover plate; 2. Exhaust pipe; 3. One-way valve; 4. Gas supply pipe; 5. Bobbin; 6. Ionization mechanism; 61. Cathode ring; 62. Cathode column; 63. Anode ring; 64. Conductive sheet; 65. First conductive column; 66. Second conductive column; 7. Motor; 8. First gear; 9. Second gear; 10. Mounting seat; 11. Fan blade; 12. First exhaust hole; 13. First sleeve; 14. Second exhaust hole; 15. Fan; 16. Rotating rod; 17. Reciprocating screw; 18. Threaded sleeve; 19. Flat plate; 20. Air vent; 21. Cover plate; 22. Barrier sheet; 23. Circular sleeve; 24. Support rod; 25. Second sleeve; 26. Third exhaust hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figures 1 to 2 A plasma cleaning device for the interior of a storage tank and a method of use thereof, comprising a cover plate 1, an exhaust pipe 2 and an air supply pipe 4 being installed on the cover plate 1, and a one-way valve 3 being installed on the exhaust pipe 2;

[0041] A circulation mechanism is provided on the lower surface of the cover plate 1, which is used to drive the circulation of gas in the storage tank. The circulation mechanism is that a barrel 5 is installed on the lower surface of the cover plate 1, and a side wall of the barrel 5 is provided with evenly distributed first exhaust holes 12 near the upper end. A first sleeve 13 is provided on the side surface of the barrel 5 near the upper end, and a group of second exhaust holes 14 are provided on the side wall of the first sleeve 13. An ionization mechanism 6 is provided on the right side of the second exhaust holes 14.

[0042] like Figure 2 As shown, the circulation mechanism further includes a fan 15 , which is installed inside the bobbin 5 near the upper end.

[0043] like Figure 6 、 Figure 7 As shown, the ionization mechanism 6 is provided with a cathode column 62 on the right side of the second exhaust hole 14. The end of the cathode column 62 facing the second exhaust hole 14 is designed in a conical structure. The outer surface of the cathode column 62 is provided with an anode ring 63, and the outer surface of the anode ring 63 is provided with a cathode ring 61. A first conductive column 65 is fixedly connected to the side surface of the cathode column 62. The upper end of the first conductive column 65 passes through the anode ring 63 and the cathode ring 61 in sequence and is fixedly connected to the lower surface of the cover plate 1. The cathode ring 61 is electrically connected to the first conductive column 65. A second conductive column 66 is fixedly connected to the side surface of the anode ring 63. The upper end of the second conductive column 66 passes through the cathode ring 61 and is fixedly connected to the cover plate 1.

[0044] When the inner wall of the storage tank needs to be cleaned, the cover plate 1 is first placed on the storage tank to be cleaned so that the cover plate 1 is tightly sealed with the upper end of the storage tank, the barrel 5 is placed inside the storage tank, and then an air pump is connected to the air extraction pipe 2, and the air extraction pump is turned on to extract the air in the storage tank. The one-way valve 3 can prevent the extracted gas from flowing back. When a relative vacuum is extracted in the storage tank, working gas is input into the storage tank through the gas supply pipe 4. After the working gas is input, the ionization mechanism 6 and the fan 15 are turned on. The fan 15 will extract the working gas from the lower end to the upper end of the barrel 5. The working gas rises to the upper end of the barrel 5 and is finally discharged from the first exhaust hole 12, discharged into the first sleeve 13, and discharged from the second exhaust hole 14. The exhausted working gas will blow to the cathode column 62, the anode ring 63 and the cathode ring 61, and flow through the inner and outer walls of the anode ring 63. While the working gas flows through, the first conductive column 65 and the second conductive column 66 are connected to the external high-frequency power supply. At this time The cathode column 62, the anode ring 63 and the cathode ring 61 will be charged and ionize the working gas flowing through, so that the working gas after flowing through is ionized into a plasma state. The plasma will gather at the upper end of the interior of the storage tank. As it gathers more and more, it will gradually spread to the lower end of the lower storage tank, and finally spread to the bottom of the barrel 5. Through the extraction of the fan 15, these plasmas will finally pass through the ionization mechanism 6 again and be ionized again by the ionization mechanism 6. Such repeated ionization will form a glow plasma. Finally, the working gas inside the storage tank will form a glow plasma. These glow plasmas will contact the inner wall of the storage tank and act on the inner wall of the storage tank to achieve a cleaning effect and change the characteristics of the inner wall of the storage tank. The present invention forms a glow plasma by cyclically ionizing the working gas. Compared with the cyclic ionization of the disclosed document, the present invention can accelerate the efficiency of forming glow plasma and also improve the cleaning efficiency of the inner wall of the storage tank.

[0045] like Figure 6 、 Figure 7 As shown, conductive sheets 64 are fixedly connected to the inner and outer walls of the anode ring 63. The ends of the conductive sheets 64 do not contact the cathode column 62 and the cathode ring 61. The installed conductive sheets 64 can increase the contact area between the anode ring 63 and the working gas flowing through, thereby greatly improving the ionization efficiency of the flowing gas.

[0046] like Figure 2 and Figure 8 As shown, a second sleeve 25 is fixedly connected to the side surface of the first sleeve 13 , the ionization mechanism 6 is arranged in the second sleeve 25 , and the upper end of the second sleeve 25 is provided with evenly distributed third exhaust holes 26 .

[0047] The plasma ionized by the ionization mechanism 6 will flow into the second sleeve 25. After the second sleeve 25 is fully accumulated, it will be discharged from the third exhaust hole 26, so that the plasma will spread downward as a whole at the upper end of the storage tank without the problem of local downward spreading. Through such operation, the working gas can be ionized into plasma first, avoiding the problem of working gas mixed in the plasma due to local downward spreading.

[0048] Example 2

[0049] like Figure 1 and Figure 3 As shown, the circulation mechanism is that the upper surface of the cover plate 1 is rotatably connected to the second gear 9, one side of the second gear 9 is meshedly connected to the first gear 8, the upper end of the first gear 8 is fixedly connected to the motor 7, the side surface of the motor 7 is fixedly connected to the mounting base 10, the lower end of the mounting base 10 is fixedly connected to the upper surface of the cover plate 1, the upper end of the bobbin 5 passes through the cover plate 1 and is fixedly connected to the second gear 9, and the inner wall of the bobbin 5 is fixedly connected to the fan blade 11 near the lower end.

[0050] After the storage tank is filled with working gas, the motor 7 and the ionization mechanism 6 are turned on. The motor 7 drives the first gear 8 to rotate and synchronously drives the second gear 9 to rotate. The second gear 9 drives the bobbin 5 to rotate while rotating. The bobbin 5 drives the fan blades 11 to rotate while rotating. The fan blades 11 drive the working gas below to flow into the inside of the bobbin 5 while rotating. Finally, it flows through the ionization mechanism 6 and is ionized into plasma. The continuous rotation of the fan blades 11 drives the gas inside the storage tank to circulate, causing it to be repeatedly ionized, and finally forming a glow plasma, thereby improving the cleaning effect on the inner wall of the storage tank.

[0051] Example 3

[0052] like Figure 1 、 Figure 4 、 Figure 7As shown, the circulation mechanism is that the upper surface of the cover plate 1 is rotatably connected to the second gear 9, one side of the second gear 9 is meshedly connected to the first gear 8, the upper end of the first gear 8 is fixedly connected to the motor 7, the side surface of the motor 7 is fixedly connected to the mounting base 10, the lower end of the second gear 9 is fixedly connected to the rotating rod 16, the lower end of the rotating rod 16 passes through the cover plate 1 and extends to the inside of the bobbin 5, the lower end of the rotating rod 16 is fixedly connected to the reciprocating screw rod 17, the side surface of the reciprocating screw rod 17 is threadedly connected to the threaded sleeve 18, the side surface of the threaded sleeve 18 is fixedly connected to the flat plate 19, the flat plate 19 is penetrated by an air vent 20, the upper surface of the flat plate 19 is rotatably connected to the cover plate 21, and the bobbin 5 is a square tube.

[0053] After the storage tank is filled with working gas, the motor 7 and the ionization mechanism 6 are turned on. The motor 7 drives the first gear 8 to rotate and synchronously drives the second gear 9 to rotate. The second gear 9 drives the rotating rod 16 to rotate while rotating. The rotating rod 16 drives the reciprocating screw 17 to rotate while rotating. The reciprocating screw 17 drives the threaded sleeve 18 up and down while rotating. The threaded sleeve 18 drives the plate 19 to move up and down synchronously while moving up and down. The bobbin 5 is a square tube design and the plate 19 is a square design, which is used to limit the plate 19 from rotating with the reciprocating screw 17. It can ensure that when the reciprocating screw 17 rotates, the threaded sleeve 18 and the plate 1 9 can move up and down. When the flat plate 19 moves downward, the working gas will push open the cover plate 21. The cover plate 21 is made of a lighter material, which is also convenient for pushing the working gas. The working gas will enter the upper part of the cover plate 21 through the air vent 20. When the flat plate 19 moves upward, the cover plate 21 rotates downward and seals the column air vent 20. At the same time, the flat plate 19 will push the working gas in the barrel 5 to flow upward, so that it flows through the ionization mechanism 6 and is ionized to form plasma. The flat plate 19 moves back and forth up and down, thereby driving the working gas in the storage tank to circulate, so that it is ionized in a cycle, and finally forms a glow plasma to improve the cleaning effect of the inner wall of the storage tank.

[0054] like Figure 4 As shown, the rotating rod 16 is a telescopic rod, and the rotating rod 16 can be telescopically folded. The bobbin 5 is in multiple groups, and the two are nested together. The inner wall diameter of the upper end of the bobbin 5 is smaller than the inner wall diameter of the lower end, and the outer wall diameter of the upper end of the bobbin 5 is smaller than the outer wall diameter of the lower end, so that the bobbin 5 can be telescoped. The telescopic principle is similar to that of a telescopic fishing rod. By shortening the rotating rod 16 and the bobbin 5, the volume occupied by the device can be greatly reduced when transporting or storing the device.

[0055] like Figure 7As shown, a barrier piece 22 is fixedly connected to the side wall of the rotating rod 16 near the lower end, and a circular ring sleeve 23 is rotatably connected to the outside of the barrier piece 22. A support rod 24 is fixedly connected to the side wall of the circular ring sleeve 23, and one end of the support rod 24 is fixedly connected to the inner wall of the barrel 5.

[0056] When the bobbin 5 is extended or retracted, the bobbin 5 can drive the support rod 24, which in turn drives the annular sleeve 23, and the annular sleeve 23 can control the barrier sheet 22, so that when the bobbin 5 is extended or retracted, the rotating rod 16 can also be driven to extend or retract up and down. This operation can better control the telescopic structure of the device and is simple and convenient to operate.

[0057] The present invention also provides a method for using the plasma cleaning device for the interior of the storage tank, comprising the following steps:

[0058] S1: Injecting gas: First, cover the upper end of the storage tank with the cover plate 1 and seal it. Then, extract the air inside the storage tank through the exhaust pipe 2. When the air is extracted to a relative vacuum state, input the working gas into the storage tank through the gas pipe 4.

[0059] S2: Circulating ionization: The ionization mechanism 6 is turned on, and the circulation mechanism is turned on at the same time. The circulation mechanism drives the working gas stored inside to circulate. While the working gas circulates, it continuously passes through the ionization mechanism 6. The ionization mechanism 6 continuously ionizes the working gas to form plasma, and the plasma gas formed is used to clean the inner wall of the storage tank;

[0060] S3: Improve ionization: The plasma is driven to circulate inside the tank through the circulation mechanism. While flowing, the plasma is ionized again through the ionization mechanism 6 to form a glow plasma, thereby improving the cleaning effect on the inner wall of the tank.

[0061] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A plasma cleaning device for the interior of a storage tank, comprising a cover plate (1), an air extraction pipe (2) and an air supply pipe (4) being mounted on the cover plate (1), and a one-way valve (3) being mounted on the air extraction pipe (2); Its characteristics are: A circulation mechanism is provided on the lower surface of the cover plate (1), and the circulation mechanism is used to drive the circulation of gas in the storage tank. The circulation mechanism comprises a tube (5) installed on the lower surface of the cover plate (1), and one end of the tube (5) away from the cover plate (1) is set as an opening; The side wall of the barrel (5) is provided with uniformly distributed first exhaust holes (12) near the upper end, the side surface of the barrel (5) is sleeved with a first sleeve (13) near the upper end, a group of second exhaust holes (14) is provided on the side wall of the first sleeve (13), and an ionization mechanism (6) is provided on the right side of the second exhaust holes (14); The ionization mechanism (6) comprises a cathode column (62), an anode ring (63), and a cathode ring (61) which are arranged in sequence from the inside to the outside; Conductive sheets (64) are fixedly connected to both the inner and outer side walls of the anode ring (63); A second sleeve (25) is fixedly connected to the side surface of the first sleeve (13), the ionization mechanism (6) is arranged in the second sleeve (25), and the upper end of the second sleeve (25) is provided with evenly distributed third exhaust holes (26); Under the action of the circulation mechanism, the working gas enters the first sleeve (13) from the open end of the barrel (5) through the first exhaust hole (12), enters the second sleeve (25) from the second exhaust hole (14), is ionized by the ionization mechanism (6) in the second sleeve (25), and is discharged from the third exhaust hole (26), so that the plasma spreads downward from the upper end of the storage tank as a whole, and the cycle is repeated to clean the interior of the storage tank.

2. The plasma cleaning device for the interior of a storage tank according to claim 1, characterized in that: The circulation mechanism further comprises a fan (15), and the fan (15) is installed inside the bobbin (5) near the upper end.

3. The plasma cleaning device for the interior of a storage tank according to claim 1, characterized in that: The circulation mechanism further comprises a second gear (9) rotatably connected to the upper surface of the cover plate (1), one side of the second gear (9) is meshedly connected to the first gear (8), the upper end of the first gear (8) is fixedly connected to the motor (7), the side surface of the motor (7) is fixedly connected to the mounting seat (10), the lower end of the mounting seat (10) is fixedly connected to the upper surface of the cover plate (1), the upper end of the bobbin (5) passes through the cover plate (1) and is fixedly connected to the second gear (9), and the inner wall of the bobbin (5) is fixedly connected to a fan blade (11) near the lower end.

4. The plasma cleaning device for the interior of a storage tank according to claim 1, characterized in that: The circulation mechanism further comprises a second gear (9) rotatably connected to the upper surface of the cover plate (1), one side of the second gear (9) is meshedly connected to the first gear (8), the upper end of the first gear (8) is fixedly connected to the motor (7), the side surface of the motor (7) is fixedly connected to the mounting seat (10), the lower end of the second gear (9) is fixedly connected to the rotating rod (16), the lower end of the rotating rod (16) passes through the cover plate (1) and extends into the interior of the bobbin (5), the lower end of the rotating rod (16) is fixedly connected to the reciprocating screw (17), the side surface of the reciprocating screw (17) is threadedly connected to the threaded sleeve (18), the side surface of the threaded sleeve (18) is fixedly connected to the flat plate (19), the flat plate (19) is provided with an air vent (20), the upper surface of the flat plate (19) is rotatably connected to the cover plate (21), and the bobbin (5) is a square tube.

5. The plasma cleaning device for the interior of a storage tank according to claim 1, characterized in that: The ionization mechanism (6) is specifically provided with a cathode column (62) on the right side of the second exhaust hole (14), and the cathode column (62) has a conical structure at one end facing the second exhaust hole (14). The cathode column (62) is provided with an anode ring (63) on the outside, and a cathode ring (61) is provided on the outside of the anode ring (63). A first conductive column (65) is fixedly connected to the side surface of the cathode column (62), and the upper end of the first conductive column (65) passes through the anode ring (63) and the cathode ring (61) in sequence and is fixedly connected to the lower surface of the cover plate (1). The cathode ring (61) is electrically connected to the first conductive column (65). A second conductive column (66) is fixedly connected to the side surface of the anode ring (63), and the upper end of the second conductive column (66) passes through the cathode ring (61) and is fixedly connected to the cover plate (1).

6. The plasma cleaning device for the interior of a storage tank according to claim 5, characterized in that: The end of the conductive sheet (64) does not contact the cathode column (62) or the cathode ring (61).

7. The plasma cleaning device for the interior of a storage tank according to claim 4, characterized in that: The rotating rod (16) is a telescopic rod, and the bobbins (5) are in multiple groups, and are nested in pairs.

8. The plasma cleaning device for the interior of a storage tank according to claim 7, characterized in that: A barrier sheet (22) is fixedly connected to the side wall of the rotating rod (16) near the lower end thereof, a circular ring (23) is rotatably connected to the outside of the barrier sheet (22), a support rod (24) is fixedly connected to the side wall of the circular ring (23), and one end of the support rod (24) is fixedly connected to the inner wall of the bobbin (5).

9. A method for using the plasma cleaning device for the interior of a storage tank according to any one of claims 1 to 8, characterized in that: The steps include: S1: Injecting gas: First, cover the upper end of the storage tank with the cover plate (1) and seal it, then extract the air inside the storage tank through the exhaust pipe (2), and when the air is extracted to a relative vacuum state, input the working gas into the storage tank through the gas pipe (4); S2: Circulating ionization: The ionization mechanism (6) is turned on, and the circulation mechanism is turned on at the same time. The circulation mechanism drives the working gas stored inside to circulate. While the working gas circulates, it continuously passes through the ionization mechanism (6). The ionization mechanism (6) continuously ionizes the working gas to form plasma, and the plasma gas formed is used to clean the inner wall of the storage tank; S3: Improve ionization: The plasma is driven to circulate inside the tank through the circulation mechanism, and while flowing, the plasma is ionized again through the ionization mechanism (6) to form a glow plasma, thereby improving the cleaning effect on the inner wall of the tank.

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