A food-grade carbon dioxide purification filtering device

Abstract

The present application relates to carbon dioxide filtration technical field, particularly to a kind of food-grade carbon dioxide purification filter equipment, including tank, end cap, filter basket, blowdown unit and cleaning unit.The present application is through the coordinated work of double-layer filter basket that can be relatively moved, inner scraping mechanism, outer scraping mechanism, guide mechanism, impurity removal mechanism and reflux mechanism, without stopping, without opening the equipment, complete to the surface of filter basket Interception impurities scraping, collection, separation and discharge, simultaneously with the liquid entrained is sent back to filtration process, realizes from regular stop dismounting cleaning to online automatic continuous cleaning fundamental change, fundamentally avoids the whole line stop caused by cleaning filter basket, significantly improves production efficiency and equipment utilization, cleaning process is completed in closed system, prevents the invasion of external air pollutants, stably guarantees the clean quality index of product.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide filtration technology, and in particular to a food-grade carbon dioxide purification and filtration device. Background Technology

[0002] Food-grade carbon dioxide refers to carbon dioxide with extremely high purity and impurity content strictly controlled within food safety standards. It can be used directly or indirectly as a food additive in food and beverage processing. In order to ensure purity and remove impurities, it needs to undergo multiple purification and filtration processes during production.

[0003] Food-grade liquid carbon dioxide often requires coarse filtration using a basket filter to remove solid particles. During basket filter operation, impurities adhere to the side walls of the basket. To prevent this buildup from affecting filtration, the end caps must be periodically removed and the basket taken out for cleaning. After cleaning, the basket is replaced and the end caps reinstalled. This process requires the filter to stop operating, impacting not only this stage of filtration but also other upstream and downstream filtration processes, leading to processing stagnation and overall efficiency decline. To minimize downtime, the intervals between cleaning operations are often long. Some impurities easily adhere to the basket surface, increasing cleaning difficulty and further prolonging cleaning time, ultimately reducing production efficiency.

[0004] In addition, when the filter end cap is opened for cleaning, the inside of the equipment is exposed to the external environment, and dust, microorganisms and moisture in the air may enter, destroying the established clean environment. This can cause the product to exceed the standards for microbial indicators, moisture or particulate matter for a period of time after production resumes, affecting production quality. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a food-grade carbon dioxide purification and filtration device to solve the technical problems existing in the prior art. The device includes a tank, an end cap, and a filter basket. An end cap is installed on the upper end of the tank, and a filter basket located inside the tank is suspended at the lower end of the end cap. An inlet and an outlet are respectively opened on both sides of the tank.

[0006] The filter basket has a double-layer structure, consisting of an inner filter layer and an outer filter layer that can move relative to each other. The side of the filter basket facing the water inlet is lower than the side facing the water outlet.

[0007] The filter basket and the end cap are jointly equipped with a sewage discharge unit. The sewage discharge unit includes a sewage discharge mechanism and a return mechanism. The sewage discharge mechanism is used to extract the impurities in the filter basket, and the return mechanism is used to send the liquid from the extracted impurities back into the filter basket.

[0008] The filter basket is equipped with a cleaning unit, which includes an inner scraping mechanism and an outer scraping mechanism. The inner scraping mechanism rotates synchronously with the impurity discharge mechanism to clean the inner filter layer, and the outer scraping mechanism rotates synchronously with the impurity discharge mechanism to clean the outer filter layer. It also includes a guide mechanism for collecting the cleaned impurities to the sewage discharge unit.

[0009] Solid impurities in the liquid are intercepted by the filter basket. When the impurities need to be cleaned, the sewage discharge unit is activated. The impurity discharge mechanism drives the inner scraping mechanism and the outer scraping mechanism to clean the inner filter layer and the outer filter layer respectively. The cleaned impurities are collected directly below the impurity discharge mechanism by the guide mechanism. The impurities are discharged from the tank by the impurity discharge mechanism, and the liquid in the impurities is returned to the filter basket by the return mechanism, completing the online cleaning.

[0010] Preferably, the impurity discharge mechanism includes a vertical pipe fixed through the end cap, the return mechanism includes a filter port, a rotating shaft is rotatably installed inside the vertical pipe, the upper end of the rotating shaft is fixedly connected to the output shaft of a motor fixedly installed at the top of the vertical pipe, an impurity discharge port is opened on the side wall of the vertical pipe, the impurity discharge port is connected to the collection box body, a filter port is provided at the lower end of the collection box, a filter screen is provided inside the filter port, the filter port is connected to the pump body inlet, and the pump body outlet is connected to the inside of the tank.

[0011] Preferably, the guiding mechanism includes planar spiral components. Two planar spiral components are installed from top to bottom at the lower end of the rotating shaft. The upper end of the planar spiral component near the central shaft has a downward inclined slope structure. Among the two planar spiral components, the lower end of the upper planar spiral component is in contact with the bottom inner wall of the inner filter layer, and the lower planar spiral component is in contact with the bottom inner wall of the outer filter layer.

[0012] Preferably, the internal scraping mechanism includes an internal scraper, which is fixedly connected to the end of the upper planar spiral component. To prevent impurities from falling between the planar spiral component and the inner filter layer, an arc-shaped stop is fixedly installed at the bottom of the internal scraper, and the outer wall of the arc-shaped stop is in contact with the inner sidewall of the inner filter layer.

[0013] Preferably, the external scraping mechanism includes an external scraper, which is fixedly connected to the lower end of the planar spiral component.

[0014] Preferably, an annular sealing plate is fixedly provided at the upper end of the inner filter layer, and the upper end of the outer filter layer is elastically slidably connected to the lower end of the annular sealing plate. The outer filter layer is driven to move up and down relative to the inner filter layer by a driving component.

[0015] Preferably, the driving component includes a vertical rod fixedly installed on the upper end of the outer filter layer, the upper end of the vertical rod sliding vertically through the annular closed plate, and a pressure rod fixedly installed on the upper end of the inner scraper, the bottom end of the pressure rod being lower than the top end of the vertical rod.

[0016] Preferably, the external scraping mechanism further includes a telescopic scraper, which consists of a fixed section, a limiting section, and a scraping section. An annular groove is provided at the lower end of the annular closed plate. The fixed section is fixedly connected to the side wall of the lower planar spiral component. The lower end of the limiting section is fixedly connected to the fixed section. The upper end of the limiting section is vertically slidably connected to the scraping section. A connecting rod is hinged to the upper end of the scraping section, and the upper end of the connecting rod is slidably engaged with the annular groove.

[0017] Preferably, the scraping sections of the inner scraper, outer scraper, and telescopic scraper are provided with multiple evenly distributed guide grooves from top to bottom on the side near the central axis of the tank.

[0018] As can be seen from the above technical solutions, the food-grade carbon dioxide purification and filtration equipment designed in this invention has the following beneficial effects: 1. This invention proposes an online automatic cleaning system. Through the coordinated work of a double-layer filter basket with relative movement, an inner scraping mechanism, an outer scraping mechanism, a guiding mechanism, a waste removal mechanism, and a return mechanism, the system completes the scraping, collection, separation, and discharge of impurities intercepted on the surface of the filter basket without stopping the machine or opening the equipment. At the same time, the entrained liquid is sent back to the filtration process, realizing a fundamental transformation from periodic shutdown for disassembly and cleaning to online automatic continuous cleaning. This fundamentally avoids the shutdown of the entire production line caused by cleaning the filter basket, significantly improving production efficiency and equipment utilization. The cleaning process is completed in a closed system, preventing the intrusion of external air pollutants and stably ensuring the cleanliness and quality indicators of the product.

[0019] 2. This invention allows the outer filter layer to move elastically up and down relative to the inner filter layer, causing micro-movements in the filter layer during operation or cleaning. This effectively reduces the adhesion of impurities to the filter material surface, making scraping easier and solving the problem of impurity caking caused by long cleaning intervals.

[0020] 3. The present invention, through the design of the telescopic scraper structure, enables the scraping section to adapt to the height changes of the outer filter layer, ensuring a comprehensive and close cleaning of the filter surface and avoiding cleaning dead corners.

[0021] 4. This invention achieves instant separation of impurities and liquid through an independent sewage discharge unit and reflux mechanism. Impurities are intercepted and facilitate subsequent processing, while process liquid is recycled and re-filtered, reducing material loss. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2 This is the front view of the present invention.

[0025] Figure 3 This is a front sectional view of the present invention.

[0026] Figure 4 This is a three-dimensional structural diagram of the present invention after removing some of its components.

[0027] Figure 5 It is a top view of the filter basket, flat spiral component, arc-shaped stop block, and inner scraper.

[0028] Figure 6 It is a three-dimensional structural diagram of the planar spiral component, the arc-shaped stop block, and the inner scraper.

[0029] Figure 7 It is a side view of the planar spiral component, the arc-shaped stop, and the inner scraper.

[0030] Figure 8 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure 9 yes Figure 5 Enlarged view of point B in the middle.

[0032] Figure 10 yes Figure 3 Enlarged view of point C in the middle.

[0033] Figure 11 It is a three-dimensional structural diagram of the planar spiral component, inner scraper, outer scraper, and telescopic scraper.

[0034] Figure 12 It is a three-dimensional structural diagram of the planar spiral component, the outer scraper, and the telescopic scraper.

[0035] Figure 13 This is a front view of the planar spiral component, inner scraper, outer scraper, and telescopic scraper.

[0036] Figure 14 yes Figure 4 Enlarged view of point D in the middle.

[0037] Reference numerals: 1. Tank body; 2. End cover; 3. Filter basket; 4. Sewage discharge unit; 5. Cleaning unit; 6. Guide groove; 7. Pump outlet; 31. Inner filter layer; 32. Outer filter layer; 33. Annular sealing plate; 34. Vertical rod; 35. Pressure rod; 41. Impurity discharge mechanism; 42. Return flow mechanism; 51. Inner scraping mechanism; 52. Outer scraping mechanism; 53. Guide mechanism; 411. Vertical pipe; 412. Rotating shaft; 413. Motor; 414. Impurity discharge port; 415. Collection box; 421. Water outlet; 422. Filter screen; 511. Inner scraper; 512. Arc-shaped stop; 513. Reinforcing rod; 521. Outer scraper; 522. Fixed section; 523. Limiting section; 524. Scraping section; 525. Annular groove; 526. Connecting rod; 531. Flat spiral component. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] See Figure 1 and Figure 3 A food-grade carbon dioxide purification and filtration device includes a tank body 1, an end cap 2, and a filter basket 3. The end cap 2 is detachably installed on the upper end of the tank body 1, and the filter basket 3 located inside the tank body 1 is suspended at the lower end of the end cap 2. The tank body 1 has an inlet and an outlet on both sides respectively.

[0040] See Figure 3 and Figure 4 The filter basket 3 has a double-layer structure, consisting of an inner filter layer 31 and an outer filter layer 32 that can move relative to each other. The upper end of the filter basket 3 has an inclined structure where the side facing the water inlet is lower than the side facing the water outlet. Filter holes are evenly distributed on the inner filter layer 31 and the outer filter layer 32. To avoid too many filter holes affecting the display of other structures in the figure, only the filter holes at the bottom of the inner filter layer 31 and the outer filter layer 32 are shown in the figure.

[0041] The outer filter layer 32 can move up and down relative to the inner filter layer 31. Specifically, an annular sealing plate 33 is fixedly provided at the upper end of the inner filter layer 31. The upper end of the outer filter layer 32 and the lower end of the annular sealing plate 33 are connected up and down by an elastic element (such as a spring, not shown in the figure). The outer filter layer 32 is driven to move up and down relative to the inner filter layer 31 by a driving element, thereby reducing the probability of impurity adhesion and facilitating cleaning.

[0042] See Figure 1 , Figure 2 and Figure 3 The filter basket 3 and the end cap 2 are provided with a sewage discharge unit 4 at their center. The sewage discharge unit 4 includes a sewage discharge mechanism 41 and a return mechanism 42. The sewage discharge mechanism 41 is used to extract the impurities in the filter basket 3, and the return mechanism 42 is used to send the liquid in the extracted impurities back into the filter basket 3.

[0043] See Figure 3 The filter basket 3 is provided with a cleaning unit 5, which includes an inner scraping mechanism 51 and an outer scraping mechanism 52. The inner scraping mechanism 51 rotates synchronously with the impurity discharge mechanism 41 to clean the inner filter layer 31, and the outer scraping mechanism 52 rotates synchronously with the impurity discharge mechanism 41 to clean the outer filter layer 32. It also includes a guide mechanism 53 for collecting the cleaned impurities to the sewage discharge unit 4.

[0044] The double-layer filter basket 3 intercepts solid impurities in the liquid. When it is necessary to clean the intercepted solid impurities, the sewage discharge unit 4 is activated. The impurity discharge mechanism 41 drives the inner scraping mechanism 51 and the outer scraping mechanism 52 to clean the inner filter layer 31 and the outer filter layer 32 respectively. The cleaned impurities are collected directly below the impurity discharge mechanism 41 through the guide mechanism 53. The impurities are discharged from the tank 1 by the impurity discharge mechanism 41, and the liquid in the impurities re-enters the filter basket 3 through the return mechanism 42, thus completing the online cleaning.

[0045] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The impurity removal mechanism 41 includes a vertical pipe 411 fixedly penetrating the end cover 2, and a return mechanism 42 includes a filter port 421. A rotating shaft 412 is rotatably installed inside the vertical pipe 411. The upper end of the rotating shaft 412 is fixedly connected to the output shaft of a motor 413 fixedly installed at the top of the vertical pipe 411. An impurity removal port 414 is opened on the side wall of the vertical pipe 411. The impurity removal port 414 is connected to the body of the collection box 415. A filter port 421 is provided at the lower end of the collection box 415. A filter screen 422 is provided inside the filter port 421. The filter port 421 is connected to the inlet of an external pump body (not shown in the figure). The outlet 7 of the pump body is connected to the inside of the tank 1. The collection box 415 is fixedly installed on the end cover 2. The front end plate of the collection box 415 is detachably connected to the body of the collection box 415, which can periodically clean the impurities inside.

[0046] See Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 11 The guiding mechanism 53 includes a planar spiral member 531. Two planar spiral members 531 are installed from top to bottom at the lower end of the rotating shaft 412. The upper end of the planar spiral member 531 near the central axis is a downward inclined slope structure. Among the two planar spiral members 531, the lower end of the upper planar spiral member 531 is in contact with the bottom inner wall of the inner filter layer 31, and the lower planar spiral member 531 is in contact with the bottom inner wall of the outer filter layer 32.

[0047] See Figure 3 , Figure 5 , Figure 6 and Figure 9 The inner scraping mechanism 51 includes an inner scraper 511, which is fixedly connected to the end of the upper planar spiral member 531. To prevent impurities from falling between the planar spiral member 531 and the inner filter layer 31, an arc-shaped stop 512 is fixedly installed at the bottom of the inner scraper 511. The outer wall of the arc-shaped stop 512 is in contact with the inner side wall of the inner filter layer 31.

[0048] It should be noted that, in order to improve the stability of the inner scraper 511, a reinforcing rod 513 can be fixedly installed on the side of the inner scraper 511 near the central axis of the tank body 1, and an annular support groove is provided on the vertical tube 411 at the position corresponding to the reinforcing rod 513. The end of the reinforcing rod 513 away from the inner scraper 511 slides in conjunction with the annular support groove to provide additional support for the inner scraper 511.

[0049] See Figure 3 , Figure 6 , Figure 10 , Figure 11 , Figure 12 and Figure 13 The external scraping mechanism 52 includes an external scraper 521, which is fixedly connected to the end of the lower flat spiral member 531. To prevent impurities from falling between the flat spiral member 531 and the external filter layer 32, an arc-shaped stop 512 can be fixedly installed at the bottom of the external scraper 521, and the outer wall of the arc-shaped stop 512 is made to fit against the inner wall of the external filter layer 32.

[0050] When cleaning is required, the liquid flow rate can be appropriately reduced, and the motor 413 can be started. The rotating shaft 412 will begin to rotate. As the planar spiral component 531 rotates with the rotating shaft 412, the corresponding inner scraper 511 and outer scraper 521 will rotate accordingly and clean the impurities attached to the inner filter layer 31 and outer filter layer 32, respectively. After the cleaned impurities fall into the corresponding planar spiral component 531, they will continuously move towards the center as the planar spiral component 531 rotates, causing the impurities to concentrate directly below the vertical pipe 411. Then, under the action of the pump, the impurities are sucked upward into the vertical pipe 411 (the impurities cleaned from the outer filter layer 32 first pass through the filter holes and are then sucked into the vertical pipe 411), and enter the collection tank 415 through the discharge port 414 of the vertical pipe 411. The liquid mixed in with the impurities passes through the filter screen 422 and enters the pump inlet from the filter port 421, and finally re-enters the tank 1 from the pump outlet 7 to filter this part of the liquid again. After cleaning is completed, the liquid flow rate can be restored.

[0051] It should be noted that a stirring plate (such as a stirrer blade) can be installed at the lower end of the rotating shaft 412. Figure 3 As shown, to improve the fluidity of the liquid and help stabilize the suction; a valve can be installed inside the vertical pipe 411 near the top and below the discharge port 414. When no cleaning operation is required, the bottom of the vertical pipe 411 can be sealed by the valve to prevent the liquid from entering.

[0052] In summary, the present invention enables online cleaning of the filter basket 3 without shutting down the machine, effectively ensuring the continuity of the entire production process.

[0053] See Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 13 and Figure 14 To further improve the comprehensiveness of removing impurities from the external filter layer 32, the external scraping mechanism 52 also includes a telescopic scraper. The telescopic scraper consists of a fixed section 522, a limiting section 523, and a scraping section 524. An annular groove 525 is provided at the lower end of the annular sealing plate 33. The fixed section 522 is fixedly connected to the side wall of the lower planar spiral component 531. The lower end of the limiting section 523 is fixedly connected to the fixed section 522. The upper end of the limiting section 523 is vertically slidably connected to the scraping section 524. A connecting rod 526 is hinged to the upper end of the scraping section 524. The upper end of the connecting rod 526 is slidably engaged with the annular groove 525.

[0054] To prevent impurities from falling between the planar spiral component 531 and the outer filter layer 32, an identical arc-shaped stop 512 can be fixedly installed on the side wall of the fixed base. It should be noted that the total length of the scraping section 524 and the outer scraper 521 is greater than the height of the highest point of the outer filter layer 32, thereby ensuring the thoroughness of the cleaning.

[0055] When the planar spiral component 531 rotates with the rotating shaft 412, the planar spiral component 531 drives the fixed seat to rotate. The fixed seat drives the scraping section 524 to scrape off the impurities adhering to the outer filter layer 32 through the limiting section 523. At the same time, the contact position between the connecting rod 526 and the annular groove 525 changes, and the height of the connecting rod 526 also changes continuously. This causes the scraping section 524 to slide vertically relative to the limiting section 523, so that the scraping section 524 can adjust its height synchronously according to the height of the corresponding position of the outer filter layer 32. This allows the area that the outer scraper 521 cannot cover to be cleaned, ensuring the thoroughness of the cleaning.

[0056] See Figure 6 , Figure 7 , Figure 11 and Figure 12 The inner scraper 511, outer scraper 521, and telescopic scraper all have multiple evenly distributed guide grooves 6 on the side of the scraping section 524 near the central axis of the tank body 1. The side of the guide groove 6 facing the rotation direction of the rotating shaft 412 is open, and the open side of the guide groove 6 is higher than the other side. This is so that during the rotation of the inner scraper 511, outer scraper 521, and telescopic scraper, some of the scraped impurities are guided to the outside of the inner scraper 511, outer scraper 521, and telescopic scraper, so as to avoid excessive adhesion of impurities and affect the subsequent scraping effect.

[0057] See Figure 3 , Figure 4 and Figure 6 The driving component includes a vertical rod 34 fixedly installed on the upper end of the outer filter layer 32, the upper end of the vertical rod 34 vertically sliding through the annular closed plate 33, and a pressure rod 35 fixedly installed on the upper end of the inner scraper 511, the bottom end of the pressure rod 35 being lower than the top end of the vertical rod 34.

[0058] When the inner scraper 511 rotates, it drives the pressure rod 35 to rotate synchronously. When the pressure rod 35 contacts the vertical rod 34, it exerts downward pressure on the vertical rod 34. The vertical rod 34 drives the outer filter layer 32 to move downward, thereby causing relative movement between the inner filter layer 31 and the outer filter layer 32. This allows for a certain amount of vibration and friction to be applied to the impurities between them, preventing the impurities from adhering too tightly and reducing the difficulty of subsequent cleaning. When the pressure rod 35 separates from the vertical rod 34, under the action of the elastic element, the outer filter layer 32 drives the vertical rod 34 to return to its original position.

[0059] It should be noted that multiple vertical rods 34 can be set. The more vertical rods 34 there are, the more times the outer filter layer 32 moves up and down relative to the inner filter layer 31 within one rotation cycle.

[0060] The structures used in this invention are all mature and reliable mechanical and fluid components. Their combination logic is clear, the operation process is well-defined, and they possess industrial manufacturability and feasibility. Therefore, this technical solution has good practicality and can be directly applied to food-grade carbon dioxide or other high-cleanliness fluid filtration scenarios, solving the core pain points of production continuity and cleanliness maintenance.

[0061] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] The above provides a detailed description of a food-grade carbon dioxide purification and filtration device provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A food-grade carbon dioxide purification and filtration device, comprising a tank, an end cap, and a filter basket, wherein an end cap is installed on the upper end of the tank, a filter basket located inside the tank is suspended at the lower end of the end cap, an inlet is provided on one side of the tank, and an outlet is provided on the other side of the tank, characterized in that: The filter basket has a double-layer structure, consisting of an inner filter layer and an outer filter layer that can move relative to each other. The side of the filter basket facing the water inlet is lower than the side facing the water outlet. A draining unit is provided at the center of the filter basket and the end cap. The draining unit includes a waste removal mechanism and a return mechanism. The waste removal mechanism is used to extract the impurities in the filter basket, and the return mechanism is used to send the liquid from the extracted impurities back into the filter basket. The filter basket is equipped with a cleaning unit, which includes an inner scraping mechanism and an outer scraping mechanism. The inner scraping mechanism rotates synchronously with the impurity discharge mechanism to clean the inner filter layer, and the outer scraping mechanism rotates synchronously with the impurity discharge mechanism to clean the outer filter layer. It also includes a guide mechanism for collecting the cleaned impurities to the sewage discharge unit. When impurities need to be cleaned, the sewage discharge unit is activated. The impurity discharge mechanism drives the inner scraping mechanism to clean the inner filter layer, and the impurity discharge mechanism drives the outer scraping mechanism to clean the outer filter layer. The cleaned impurities are collected by the guide mechanism to the bottom of the impurity discharge mechanism. The impurities are discharged from the tank by the impurity discharge mechanism, and the liquid in the impurities is returned to the filter basket by the return mechanism. The online closed-loop comprehensive cleaning is completed through the dynamic filter layer and comprehensive scraping design. The impurity removal mechanism includes a vertical pipe with a fixed through-end cover, and a return mechanism includes a filter port. A rotating shaft is rotatably installed inside the vertical pipe. The upper end of the rotating shaft is fixedly connected to the output shaft of a motor fixedly installed at the top of the vertical pipe. An impurity removal port is opened on the side wall of the vertical pipe and is connected to the collection box. A filter port is provided at the lower end of the collection box. A filter screen is installed inside the filter port. The filter port is connected to the pump inlet and the pump outlet is connected to the inside of the tank. The guiding mechanism includes planar spiral components. Two planar spiral components are installed from top to bottom at the lower end of the rotating shaft. The upper end of the planar spiral component near the central shaft is a downward inclined slope structure. Among the two planar spiral components, the lower end of the upper planar spiral component is in contact with the bottom inner wall of the inner filter layer, and the lower planar spiral component is in contact with the bottom inner wall of the outer filter layer. The internal scraping mechanism includes an internal scraper, which is fixedly connected to the end of the upper planar spiral component. To prevent impurities from falling between the planar spiral component and the inner filter layer, an arc-shaped stop is fixedly installed at the bottom of the internal scraper, and the outer wall of the arc-shaped stop fits against the inner wall of the inner filter layer. The external scraping mechanism includes an external scraper, which is fixedly connected to the lower end of the planar spiral component. An annular sealing plate is fixedly installed at the upper end of the inner filter layer, and the upper end of the outer filter layer is elastically slidably connected to the lower end of the annular sealing plate. The outer filter layer moves up and down relative to the inner filter layer through a driving component. The driving component includes a vertical rod fixedly installed on the upper end of the outer filter layer, the upper end of the vertical rod sliding vertically through the annular closed plate, and a pressure rod fixedly installed on the upper end of the inner scraper, with the bottom end of the pressure rod lower than the top end of the vertical rod.

2. The food-grade carbon dioxide purification and filtration equipment according to claim 1, characterized in that, The external scraping mechanism also includes a telescopic scraper, which consists of a fixed section, a limiting section, and a scraping section. An annular groove is provided at the lower end of the annular closed plate. The fixed section is fixedly connected to the side wall of the lower planar spiral component. The lower end of the limiting section is fixedly connected to the fixed section. The upper end of the limiting section is vertically slidably connected to the scraping section. A connecting rod is hinged to the upper end of the scraping section. The upper end of the connecting rod is slidably engaged with the annular groove.

3. The food-grade carbon dioxide purification and filtration equipment according to claim 2, characterized in that, The inner scraper, outer scraper, and telescopic scraper all have multiple evenly distributed guide grooves on the side of the scraping section closest to the central axis of the tank.

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