A refined sulfuric acid filtration device

Abstract

The present invention relates to the technical field of filtering devices, and specifically discloses a refined sulfuric acid filtering device, which includes a tank body, a plurality of vertical filter elements, a backwashing mechanism, and a slag cleaning ring; the backwashing mechanism includes a piston, a push rod, and a drive assembly, the piston is embedded with a first magnetic component, and the piston can move downward in the filter element to increase the filtrate pressure and realize backwashing; the slag cleaning ring is sleeved on the outside of each filter element, embedded with a second magnetic component, and the slag cleaning ring is driven by the piston to remove the filter residue on the outer wall of the filter element. The refined sulfuric acid filtering device can remove the filter residue on the outer wall of the filter element and can backwash the filter element, with good cleaning effect, which can ensure the filtration efficiency of the filter element and significantly improve the service life; the overall equipment is based on an automated design, the cleaning process is fast and efficient, and online operation is realized, which will not have a significant impact on the production process; the filtering device has a simple structure and is easy to implement, consumes less energy during backwashing, has low operating costs, and is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to a filtering device, in particular to a refined sulfuric acid filtering device. Background Art

[0002] During the refined sulfuric acid processing process, filters are used to remove solid particles and are crucial for ensuring sulfuric acid purity. However, filter cartridges gradually accumulate residue during use, reducing filtration efficiency and even causing clogging, necessitating regular cleaning and maintenance. Currently, filter cartridge cleaning relies primarily on mechanical scraping, spray flushing, and chemical cleaning, requiring downtime for these operations, impacting production efficiency and economic benefits.

[0003] The patent with publication number CN113786654A discloses an automatic cleaning filter for sulfuric acid production, which makes technical improvements to the cleaning method of the filter element. This technical solution solves the technical problem of the need to shut down the equipment when cleaning the filter element, but it still has shortcomings. Specifically, the transmission structure, water absorption structure and cleaning structure are integrated inside the filter housing. The overall structure is very complex, the cost is high and it is not conducive to maintenance; the nozzle sprays filtrate to clean the filter element, which can only remove impurities on the surface of the filter element. Especially when the filter is under pressure, this spray cleaning method is difficult to effectively clean the particles that penetrate into the internal pores of the filter element, and the backwash effect cannot be achieved. Summary of the Invention

[0004] In order to solve the problems of the existing technology, the present invention provides a refined sulfuric acid filtration device, which integrates a backwash mechanism and a slag cleaning ring with a coupling mechanism. The backwash mechanism can drive the filtrate in the filter element to flow in the opposite direction to backwash the filter element. At the same time, the backwash mechanism drives the slag cleaning ring to move along the filter element during operation, effectively removing the filter residue layer outside the filter element, thereby achieving a good cleaning effect on the filter element.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] A refined sulfuric acid filtering device comprises a tank body and a plurality of vertically arranged filter elements; the tank body is connected to a liquid inlet pipe, a mounting seat is fixed at the upper end, and the mounting seat is connected to a liquid outlet pipe; the upper end of the filter element is an outlet end, and the outlet end is sealedly connected to the mounting seat; the refined sulfuric acid filtering device further comprises:

[0007] The backwash mechanism includes a piston, a push rod, and a drive assembly; the piston is located in the seating seat in an initial position, is fixedly connected to the lower end of the push rod, and has a first magnetic component embedded therein; the push rod extends above the seating seat and the two are in a sealed and sliding fit, and the push rod is in transmission connection with the drive assembly; the piston is capable of moving downward within the filter element, increasing the pressure of the filtrate below the piston inside the filter element, causing the filtrate to penetrate the filter element in the reverse direction, thereby achieving backwashing;

[0008] Several cleaning rings are sleeved on the outside of each filter element and embedded with a second magnetic component; the first magnetic component and the second magnetic component can be coupled to make the cleaning ring move synchronously with the piston to remove the filter residue on the outer wall of the filter element;

[0009] The filter element is composed of a core tube with a hollow wall and a filter layer compounded on the outside of the core tube. A dirt collecting area is reserved between the lower end of the filter element and the bottom of the tank body.

[0010] In a preferred embodiment, the first magnetic component has a disk or ring structure, and the second magnetic component has a ring structure.

[0011] In a preferred embodiment, the push rods can be divided into several groups, and the drive assembly is correspondingly provided with a plurality of linear drive devices to provide driving action for each group of push rods, thereby enabling the cleaning work of the filter element to be carried out in groups and at different times.

[0012] In a preferred embodiment, the drive assembly includes a support frame, a drive plate, a screw and a motor device; the support frame is fixed to the top of the tank body, the drive plate is fixedly connected to the upper ends of all push rods, and a screw sleeve is fixed on the drive plate; the upper part of the screw is rotatably connected to the support frame, and the lower end is rotatably connected to the top of the tank body, and the screw and the screw sleeve are threadedly matched; the motor device is transmission connected to the screw.

[0013] In a preferred embodiment, all the slag cleaning rings are fixedly connected together via a plurality of longitudinal ribs to form an integrated frame structure.

[0014] In a preferred embodiment, a side hole is provided on the seating seat, and the side hole is connected to the liquid outlet pipe; when the piston is in the initial position, it is located above the side hole and is sealed with the inner cavity of the seating seat.

[0015] In a preferred embodiment, the outlet end of the filter element is threadedly connected to the mounting seat, the lower end is provided with a tool interface, and the lower end of the tank body is a detachable bottom cover.

[0016] In a preferred embodiment, a sewage outlet is provided at the bottom of the sewage collection area, and the sewage outlet is sealedly connected to a collection container for storing filter residue through a first sewage valve, and the lower end of the collection container is connected to a sewage pipe through a second sewage valve.

[0017] In a preferred embodiment, a brushing component for brushing the outer wall of the filter element is fixed on the slag cleaning ring, and the brushing component is made of elastic material;

[0018] Furthermore, the outer contour of the lower end of the placement seat is cylindrical, and the slag cleaning ring is sleeved on the lower end of the placement seat when it moves to the upper end of the stroke. The brushing assembly is in contact with the side wall of the placement seat to restrain the slag cleaning ring at the upper end of the stroke.

[0019] In a preferred embodiment, the refined sulfuric acid filtration device includes a controller for adjusting the working state of the drive component, a first pressure detection device for detecting the internal pressure thereof is installed on the tank body, and a second pressure detection device for detecting the pressure on the lower side thereof is installed on the lower side of the piston. The controller can adjust the downward movement speed of the piston based on the data fed back by the first pressure detection device and the second pressure detection device.

[0020] In a preferred embodiment, a liquid inlet hole is provided at the lower end of the piston, and liquid outlet holes communicating with the liquid inlet hole are distributed evenly on the side walls.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] 1. This refined sulfuric acid filtration device can remove the filter residue outside the filter element and can backwash the filter element to remove the particles that have penetrated into the internal pores of the filter element, thereby significantly improving the cleaning effect, which is beneficial to improving the filtration efficiency of the equipment and extending the working life of the filter element.

[0023] 2. This refined sulfuric acid filtration device is based on an automated design. When cleaning the filter element, there is no need to disassemble components, empty or relieve pressure. It is fast and efficient, can be operated online, and ensures the continuity of the production process. The filter element cleaning process will not have a significant impact on the filtration work.

[0024] 3. The moving path of the piston in this refined sulfuric acid filtering device is located inside the filter element, and no space needs to be reserved in the tank body; the slag cleaning ring is driven up and down by the piston, and no separate driving device is required; thus, the overall structure of the device is simple and easy to implement.

[0025] 4. When the refined sulfuric acid filtration device uses a piston to backwash the filter element, the reverse flow of the filtrate is limited to the adjacent area around the filter element, without changing the overall flow direction of the fluid inside the filter device. Therefore, compared with previous backwashing technologies, the refined sulfuric acid filtration device consumes less energy when backwashing the filter element, has low operating costs, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0027] Figure 1 Schematic diagram of the overall structure of the refined sulfuric acid filtering device in the embodiment.

[0028] Figure 2 Schematic diagram of the overall structure of the refined sulfuric acid filtering device in another direction in the embodiment.

[0029] Figure 3 Schematic diagram of the structure inside the tank body in the embodiment.

[0030] Figure 4 Schematic diagram of the structure of the filter element in the embodiment.

[0031] Figure 5 Schematic diagram of the structure of the piston in the embodiment.

[0032] Figure 6 Schematic diagram of the structure of the slag cleaning ring in the embodiment.

[0033] Figure 7 Schematic diagram of the matching structure of the tank body, the mounting seat and the piston in the embodiment.

[0034] Figure 8 Schematic diagram of the matching structure of the filter element, the mounting seat and the slag cleaning ring in the embodiment.

[0035] Figure 9 Schematic diagram of the working state of the refined sulfuric acid filtering device in normal operation in the embodiment.

[0036] Figure 10 This is a schematic diagram of the working state of the purified sulfuric acid filtering device during cleaning treatment in the embodiment.

[0037] Figure 11 Schematic diagram of the working state of the driving component in the embodiment.

[0038] Figure 12 Schematic diagram of the structure of the piston in another embodiment.

[0039] In the figure, 1, drain pipe, 2, second drain valve, 3, collecting container, 4, first drain valve, 5, tank body, 6, first pressure detection device, 7, placement seat, 8, liquid outlet pipe, 9, support frame, 10, screw, 11, screw sleeve, 12, motor device, 13, drive plate, 14, push rod, 15, liquid inlet pipe, 16, bottom cover, 17, filter element, 171, tool interface, 172, core tube, 173, filter layer, 174, outlet end, 18, slag cleaning ring, 19, sewage collection area, 20, piston, 21, second pressure detection device, 22, first magnetic component, 23, brushing assembly, 24, second magnetic component, 25, longitudinal rib, 26, side hole, 27, liquid inlet hole, 28, liquid outlet hole. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See Figures 1-10 As shown, the embodiment discloses a refined sulfuric acid filtering device, including a tank body 5, a plurality of filter elements 17, a backwash mechanism and a slag cleaning ring 18;

[0042] One side of the tank body 5 is connected to a liquid inlet pipe 15, and the upper end of the tank body 5 is fixed with a placement seat 7 of the same number as the filter element 17, and all the placement seats 7 are connected to the liquid outlet pipe 8; the filter element 17 is cylindrical and vertically placed in the tank body 5, and the upper end of the filter element 17 is an outlet end 174 for discharging filtrate, and the outlet end 174 is sealed with the placement seat 7, and the outlet end 174 of the filter element 17 is connected to the liquid outlet pipe 8 through the inner cavity of the placement seat 7; thus, Figure 9 As shown, the sulfuric acid in the tank 5 enters the interior of the filter element 17 to form a filtrate, which flows through the outlet end 174 and the inner cavity of the placement seat 7 in sequence, and is finally discharged through the liquid outlet pipe 8, which serves as a filtration path, and the filter residue is accumulated outside the filter element 17;

[0043] The backwashing mechanism includes a piston 20, a push rod 14 and a drive assembly. The number of pistons 20 is equal to that of push rods 14 and filter elements 17. When the piston 20 is in the initial position, it is located in the seating seat 7 and can move downward to enter the interior of the filter element 17. The push rod 14 extends in the vertical direction, and the lower end of the push rod 14 is fixedly connected to the piston 20. The push rod 14 extends to the top of the seating seat 7 and the two are sealed and slidably fitted. The drive assembly is located outside the tank body 5 and is transmission-connected to the push rod 14. The drive assembly is used to drive the push rod 14 and the piston 20 to move up and down. When the piston 20 moves downward in the filter element 17, the filtrate pressure below the piston 20 in the filter element 17 increases and penetrates the filter element 17 in the reverse direction to backwash the filter element 17. A first magnetic component 22 is embedded in the piston 20.

[0044] There are multiple cleaning rings 18, each of which is sleeved on the outside of each filter element 17. The cleaning rings 18 are embedded with second magnetic components 24. When the piston 20 moves up and down in the filter element 17, the corresponding first magnetic components 22 and second magnetic components 24 can couple with each other. Thereafter, the piston 20 drives the cleaning rings 18 to move up and down along the outside of the filter element 17, thereby removing the filter residue attached to the outer wall of the filter element 17.

[0045] The filter element 17 is composed of a core tube 172 with a hollow wall and a filter layer 173 compounded on the outside of the core tube 172. The core tube 172 serves as a skeleton, so that the filter element 17 as a whole has good strength and can withstand the pressure fluctuations generated during the backwashing process; a space is reserved between the lower end of the filter element 17 and the bottom of the tank body 5, and the space serves as a sewage collection area 19 for collecting settled filter residue.

[0046] The working principle of this refined sulfuric acid filtration device when cleaning the filter element is as follows:

[0047] like Figure 10 As shown, when the filter element 17 needs to be cleaned, the push rod 14 is driven downward by the driving assembly, and the piston 20 enters the interior of the filter element 17. During the downward movement of the piston 20 inside the filter element 17, the pressure of the filtrate below the piston 20 inside the filter element 17 increases and cannot flow toward the outlet end. Therefore, it can only pass through the filter layer of the filter element 17 in the reverse direction and enter the interior of the tank body 5, thereby backwashing the filter element 17; at the same time, the driving assembly is used to drive the piston 20 to move back and forth inside the filter element 17, and backwashing can be performed intermittently, so that the pressure difference between the inside and outside of the filter element 17 changes in an oscillatory manner, further improving the backwashing effect; during the movement of the piston 20 inside the filter element 17, after the first magnetic component and the second magnetic component are coupled, the residue cleaning ring 18 will be driven by the piston 20 and move up and down along the outside of the filter element 17, effectively removing the filter residue accumulated outside the filter element 17. The removed filter residue settles to the sewage collection area 19. After the filter residue collected in the sewage collection area 19 reaches a certain amount, it is centrally recovered and processed.

[0048] The refined sulfuric acid filtering device can remove the filter residue on the outside of the filter element 17 and can backwash the filter element 17 to remove the particles that have penetrated into the internal pores of the filter element 17, thereby significantly improving the cleaning effect, which is beneficial to improving the filtering efficiency of the equipment and extending the service life of the filter element 17.

[0049] See Figure 10 As shown, the refined sulfuric acid filtering device is based on an automated design. When cleaning the filter element 17, there is no need to disassemble components, empty, or relieve pressure. It is fast and efficient, and can be operated online to ensure the continuity of the production process. During the movement of the piston 20 and the slag cleaning ring 18, only a part of the filter element 17 is blocked. The part of the filter element 17 above the piston 20 can still ensure the connectivity of the filtration path. In addition, the time required for the piston 20 to complete a stroke is short. Therefore, the cleaning process of the filter element 17 will not have a significant impact on the filtration work.

[0050] In the present refined sulfuric acid filtering device, the movement path of the piston 20 is located inside the filter element 17, and no space needs to be reserved in the tank body 5; the slag cleaning ring 18 is driven up and down by the piston 20, and no separate driving device needs to be provided; thus, the overall structure of the present refined sulfuric acid filtering device is relatively simple and easy to implement.

[0051] When the piston 20 of the present refined sulfuric acid filtering device backwashes the filter element 17, the reverse flow of the filtrate is limited to the adjacent area around the filter element 17, without changing the overall flow direction of the fluid inside the filtering device. Therefore, compared with previous backwashing technologies, the present refined sulfuric acid filtering device consumes less energy when backwashing the filter element 17, has low operating costs, and is energy-saving and environmentally friendly.

[0052] This refined sulfuric acid filtration device involves refined sulfuric acid filtration. Therefore, components such as the tank body 5, seating 7, cleaning ring 18, piston 20, and push rod 14 must be resistant to sulfuric acid corrosion. Taking into account the structural characteristics of these components, these requirements can be effectively met by selecting acid-resistant materials (such as Hastelloy C-276, high-silicon cast iron Durofer, or polytetrafluoroethylene), providing acid-resistant linings (such as PTFE), and coating or spraying an acid-resistant protective layer on the surface. The first and second magnetic components 22 and 24 can be entirely made of magnetic material and installed within the piston 20 and cleaning ring 18, respectively, through a sealed embedding process to prevent direct contact between the magnetic material and sulfuric acid. Alternatively, the magnetic material can be coated with an acid-resistant material or sprayed with an acid-resistant coating to meet these requirements. Clearly, these technical approaches to sulfuric acid corrosion resistance are widely used in industry, and implementation presents no technical obstacles.

[0053] The first magnetic component 22 and the second magnetic component 24 realize synchronous driving of the piston 20 and the slag cleaning ring 18 through magnetic coupling. In order to improve the magnetic force transmission efficiency and optimize the magnetic field distribution, the first magnetic component 22 preferably adopts a disc or ring structure, and the second magnetic component 24 preferably adopts a ring structure.

[0054] The function of the drive assembly is to drive the push rod 14 and the piston 20 to achieve precise up and down reciprocating motion. The drive assembly can adopt commonly used linear drive devices such as hydraulic cylinders, pneumatic cylinders, servo electric push rods or linear motors. In the specific implementation process, the push rods 14 can be centrally driven or grouped according to the actual production process requirements; specifically, in order to reduce the impact of the filter element 17 on the filtration work during the cleaning process, the push rods 14 can be divided into several groups, and the drive assembly is correspondingly provided with multiple linear drive devices to provide driving action for each group of push rods 14, thereby enabling the cleaning work of the filter element 17 to be carried out in groups and time; in view of the cleaning treatment principle adopted by the refined sulfuric acid filtering device for the filter element 17, even if all the filter elements 17 are cleaned at the same time, the impact on the actual production of refined sulfuric acid is not significant. Therefore, a more preferred way is to use the drive assembly to collectively drive all the push rods 14, thereby improving the structural compactness of the refined sulfuric acid filtering device and reducing the operating energy consumption. The specific preferred structure is:

[0055] See Figure 1 、 Figure 2 、 Figure 11 As shown, the drive assembly includes a support frame 9, a drive plate 13, a screw 10 and a motor device 12; the support frame 9 is fixed to the top of the tank body 5, the drive plate 13 is fixedly connected to the upper ends of all push rods 14, and a screw sleeve 11 is fixed on the drive plate 13; the screw 10 extends vertically, the upper part is rotatably connected to the support frame 9 through a bearing, and the lower end is rotatably connected to the top of the tank body 5 through a flange bearing, and the screw 10 is threadedly engaged with the screw sleeve 11; the motor device 12 is fixed to the tank body 5 or the support frame 9, and the motor device 12 is transmission-connected to the screw 10; thus, when the motor device 12 is running, the screw 10 drives the drive plate 13 and all push rods 14 to rise and fall synchronously;

[0056] Further, such as Figure 6 、 Figure 10 As shown, all the slag cleaning rings 18 are fixedly connected together by a number of longitudinal ribs 25 to form an integrated frame structure; since all the pistons 20 can be raised and lowered synchronously, all the first magnetic components 22 and the corresponding second magnetic components 24 can be coupled at the same time, so that the pistons 20 can provide a more stable driving effect for the slag cleaning rings 18, and the longitudinal ribs 25 are in an upright state, which can greatly reduce the fluid resistance when rising and falling in sulfuric acid.

[0057] like Figure 7-Figure 9As shown, a side hole 26 is provided on the seating seat 7, and the inner cavity of the seating seat 7 is connected to the liquid outlet pipe 8 through the side hole 26; when the piston 20 is in the initial position, it is located above the side hole 26 and is sealed with the inner cavity of the seating seat 7; based on this design, on the one hand, when the filter element 17 is not cleaned, the piston 20 is sealed with the inner cavity of the seating seat 7, which can significantly reduce the load on the sliding seal between the push rod 14 and the seating seat 7, extend the service life of the seal, and reduce the risk of sulfuric acid leakage. On the other hand, when the filter element 17 is not cleaned, the piston 20 is located above the side hole 26, avoiding cross-sectional obstruction of the flow channel and achieving a compact layout.

[0058] See Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 As shown, the outlet end 174 of the filter element 17 is threadedly connected to the mounting seat 7, and the lower end of the filter element 17 is provided with a tool interface 171. The structure of the tool interface 171 can be designed to be an internal hexagon or an external hexagon to adapt to a torque wrench or special tools for disassembly and assembly operations; the lower end of the tank body 5 is provided with a detachable bottom cover 16, specifically, the bottom cover 16 is fixed to the lower end of the tank body 5 main body through a flange seal; based on the detachable design of the bottom cover 16, when the filter element 17 needs to be replaced, the bottom cover 16 is removed and the tool interface 171 is screwed to complete the disassembly and installation of the filter element 17 conveniently and quickly.

[0059] See Figure 1 、 Figure 10 As shown, the bottom of the waste collection area 19 is provided with a drain outlet, which is sealedly connected to a collection container 3 for storing filter residue via a first drain valve 4. The lower end of the collection container 3 is connected to a drain pipe 1 via a second drain valve 2. During normal operation of the refined sulfuric acid filtration device, the first drain valve 4 remains fully open to ensure that the filter residue accumulated in the waste collection area 19 can flow smoothly into the collection container 3 by gravity. The second drain valve 2 remains closed to prevent sulfuric acid leakage. During regular cleaning of the filter residue, the first drain valve 4 is first closed to safely isolate the sulfuric acid in the tank 5. The second drain valve 2 is then opened to discharge the filter residue in the collection container 3 through the drain pipe 1. After the filter residue is emptied, the second drain valve 2 is first closed, and then the first drain valve 4 is opened to resume the refined sulfuric acid filtration device's original operating state. This method of filter residue removal is quick and efficient, requiring no interruption of the refined sulfuric acid filtration device's operation, thus ensuring the continuity of the production process. In addition, a mechanical interlocking or an electric interlocking mechanism can be established between the first sewage valve 4 and the second sewage valve 2 to ensure that the two valves cannot be in the open state at the same time, thereby effectively avoiding the risk of sulfuric acid leakage.

[0060] like Figure 6 、 Figure 10As shown, a brush assembly 23 is fixed to the inner sidewall of the cleaning ring 18. The brush assembly 23 is used to clean the outer wall of the filter element 17. The brush assembly 23 is made of an elastic material and can be constructed with bristles or thorns. When the cleaning ring 18 moves up and down, the brush assembly 23 slides against the outer wall of the filter element 17 with a constant contact pressure, effectively stripping the filter residue from the surface of the filter element 17 while preventing scratches on the filter layer 173 through elastic deformation.

[0061] Further, such as Figure 6-Figure 9 As shown, the outer contour of the lower end of the seating seat 7 is cylindrical, and the slag cleaning ring 18 is sleeved on the lower end of the corresponding seating seat 7 when it moves to the upper end of the stroke, and the brushing assembly 23 is in contact with the side wall of the seating seat 7, binding the slag cleaning ring 18 to the upper end of the stroke; thus, after the filter element 17 is cleaned, the slag cleaning ring 18 moves upward with the piston 20. When the slag cleaning ring 18 reaches the upper end of the stroke, it cannot continue to move upward with the piston 20, and the first magnetic component is separated from the second magnetic component. Thereafter, the elastic characteristics of the brushing assembly 23 are used to confine the slag cleaning ring 18 to the lower end of the seating seat 7 to avoid blocking the outer side of the filter element 17 to ensure the filtering efficiency of the equipment; conversely, when the filter element 17 is cleaned, the piston 20 moves downward from the initial position. When the first magnetic component is coupled with the second magnetic component, the slag cleaning ring 18 will break free from the binding effect of the brushing assembly 23 and the seating seat 7, and then move synchronously with the piston 20.

[0062] See Figure 1 、 Figure 5 、 Figure 10 As shown, the refined sulfuric acid filtration device further includes a controller (not shown) for adjusting the operating state of the drive assembly. A first pressure sensing device 6 for detecting internal pressure is mounted on the tank body 5, and a second pressure sensing device 21 for detecting pressure below the piston 20 is mounted below the piston 20. The controller is capable of adjusting the downward movement speed of the piston 20 based on feedback from the first and second pressure sensing devices 6 and 21. Thus, during the backwash process, the drive assembly can dynamically regulate the downward movement speed of the piston 20, maintaining a preset constant pressure differential between the interior and exterior of the filter element 17. This ensures that the backwash force effectively removes impurities deep within the pores of the filter element 17, ensuring the backwash effect while preventing damage to the filter element 17 caused by excessive internal pressure. During normal operation of the refined sulfuric acid filtration device, the pressure within the tank body 5 can be determined based on the first pressure sensing device 6, thereby determining the operating state of the sulfuric acid filtration device.

[0063] See Figure 12As shown, in another embodiment, the lower end of the piston 20 is provided with a liquid inlet hole 27, and the side wall is evenly distributed with liquid outlet holes 28 connected to the liquid inlet hole 27; during the downward movement of the piston 20, the pressure on the lower side of the piston 20 increases, and the filtrate in the filter element enters through the liquid inlet hole 27 and is sprayed out through the liquid outlet hole 28, spraying and flushing the filter layer from the inside to the outside, thereby further improving the backwashing effect.

[0064] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0065] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A refined sulfuric acid filtering device, comprising a tank body and a plurality of vertically arranged filter elements; the tank body is connected to a liquid inlet pipe, the upper end of which is fixed with a mounting seat, the mounting seat being connected to a liquid outlet pipe; the upper end of the filter element is an outlet end, which is sealed to the mounting seat; characterized in that: Also includes: The backwash mechanism includes a piston, a push rod, and a drive assembly; the piston is located in the mounting seat in the initial position, is fixedly connected to the lower end of the push rod, and has a first magnetic component embedded therein; the push rod extends to the top of the mounting seat and the two are in sealed sliding engagement, and the push rod is in transmission connection with the drive assembly; the piston is capable of moving downward within the filter element, thereby increasing the pressure of the filtrate below the piston inside the filter element and causing it to penetrate the filter element in the reverse direction, thereby achieving backwashing; a liquid inlet hole is provided at the lower end of the piston, and liquid outlet holes communicating with the liquid inlet hole are uniformly distributed on the side walls; Several cleaning rings are sleeved on the outside of each filter element and embedded with a second magnetic component; the first magnetic component and the second magnetic component can be coupled to make the cleaning ring move synchronously with the piston to remove the filter residue on the outer wall of the filter element; The filter element is composed of a core tube with a hollow wall and a filter layer compounded on the outside of the core tube. A sewage collection area is reserved between the lower end of the filter element and the bottom of the tank body; a sewage outlet is provided at the bottom of the sewage collection area, and the sewage outlet is sealed and connected to a collection container for storing filter residue through a first sewage valve, and the lower end of the collection container is connected to a sewage pipe through a second sewage valve; during normal operation of the refined sulfuric acid filtering device, the first sewage valve remains open and the second sewage valve remains closed; when cleaning the filter residue, the first sewage valve is closed first, and then the second sewage valve is opened; after the filter residue is emptied, the second sewage valve is closed first, and then the first sewage valve is opened.

2. The purified sulfuric acid filtering device according to claim 1, characterized in that: The driving assembly includes a support frame, a driving plate, a screw and a motor device; the support frame is fixed to the top of the tank body, the driving plate is fixedly connected to the upper ends of all push rods, and a screw sleeve is fixed on the driving plate; the upper part of the screw is rotatably connected to the support frame, and the lower end is rotatably connected to the top of the tank body, and the screw and the screw sleeve are threadedly matched; the motor device is transmission connected to the screw.

3. The purified sulfuric acid filtering device according to claim 1, characterized in that: All the slag cleaning rings are fixedly connected together by a number of longitudinal ribs to form an integrated frame structure.

4. The purified sulfuric acid filtering device according to claim 1, characterized in that: The placement seat is provided with a side hole which is communicated with the liquid outlet pipe; when the piston is in the initial position, it is located above the side hole and is sealed with the inner cavity of the placement seat.

5. The purified sulfuric acid filtering device according to claim 1, characterized in that: The outlet end of the filter element is threadedly connected to the placement seat, and the lower end is provided with a tool interface. The lower end of the tank body is a detachable bottom cover.

6. The purified sulfuric acid filtering device according to claim 1, characterized in that: A brushing component for brushing the outer wall of the filter element is fixed on the slag cleaning ring, and the brushing component is made of elastic material.

7. The purified sulfuric acid filtering device according to claim 6, characterized in that: The outer contour of the lower end of the placement seat is cylindrical. When the slag cleaning ring moves to the upper end of the stroke, it is sleeved on the lower end of the placement seat. The brushing component abuts against the side wall of the placement seat to restrain the slag cleaning ring at the upper end of the stroke.

8. The purified sulfuric acid filtering device according to claim 1, characterized in that: It includes a controller for adjusting the working state of the drive component, a first pressure detection device for detecting the internal pressure of the tank body is installed on the tank body, and a second pressure detection device for detecting the pressure on the lower side of the piston is installed on the lower side of the piston. The controller can adjust the downward movement speed of the piston based on the data fed back by the first pressure detection device and the second pressure detection device.

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