Refined sulfuric acid filtering device

Abstract

The invention relates to the technical field of filtering devices, and particularly discloses a refined sulfuric acid filtering device which comprises a tank body, a plurality of vertical filter elements, a backwashing mechanism and a slag removal ring, the backwashing mechanism comprises a piston, a push rod and a driving assembly, a first magnetic component is embedded in the piston, and the piston can move downwards in the filter element, so that the pressure of filtrate is increased, and backwashing is realized; each filter element is sleeved with the slag removal ring, a second magnetic component is embedded in the slag removal ring, and the slag removal ring is driven by the piston to remove filter residues on the outer wall of the filter element. According to the refined sulfuric acid filtering device, filter residues on the outer wall of the filter element can be removed, the filter element can be backwashed, the cleaning treatment effect is good, the filtering efficiency of the filter element can be guaranteed, and the working life is remarkably prolonged; the whole equipment is based on automatic design, the cleaning treatment work is fast and efficient, online operation is achieved, and the production process cannot be remarkably affected; the filtering device is simple in structure, easy to implement, less in energy consumption during backwashing, low in operation cost, energy-saving and environment-friendly.

Description

Technical Field

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

[0002] In the process of refined sulfuric acid processing, the filter device is used to filter out solid particles and is a key device to ensure the purity of sulfuric acid. However, filter residues will gradually accumulate in the filter element during use, resulting in reduced filtration efficiency or even blockage, and regular cleaning and maintenance are required. At present, the filter element is mainly cleaned by mechanical scraping, spray flushing and chemical cleaning, which requires shutdown for operation, affecting 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 that the equipment needs to be shut down 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, costly and 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 backwashing effect cannot be achieved. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a refined sulfuric acid filtering device, in which a backwashing mechanism and a slag cleaning ring with a coupling mechanism are integrated. The backwashing 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 backwashing 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 placed filter elements; the tank body is connected to a liquid inlet pipe, a mounting seat is fixed at the upper end, and a liquid outlet pipe is connected to the mounting seat; the upper end of the filter element is an outlet end, and the outlet end is sealed and connected to the mounting seat; the refined sulfuric acid filtering device also comprises:

[0007] The backwashing mechanism comprises a piston, a push rod and a driving assembly; the piston is located in the mounting seat in the initial position, fixedly connected to the lower end of the push rod, and embedded with a first magnetic component; the push rod extends to the top of the mounting seat and the two are sealed and slidably matched, and the push rod is in transmission connection with the driving assembly; the piston can move downward in the filter element, so that the filtrate pressure inside the filter element below the piston increases and reversely penetrates the filter element to achieve backwashing;

[0008] A plurality of 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 so that the cleaning ring and the piston move synchronously 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, and 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 is a disk or ring structure, and the second magnetic component is 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 driving assembly includes a support frame, a driving plate, a screw and a motor; 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.

[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 formed 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 filter element outlet end is threadedly connected to the mounting seat, a tool interface is provided at the lower end, 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 collecting area, and the sewage outlet is sealedly connected to a collection container for storing filter residues via a first sewage valve, and the lower end of the collection container is connected to a sewage pipe via 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 seating seat is cylindrical, and the slag cleaning ring is sleeved on the lower end of the seating seat when it moves to the upper end of the stroke, and the brushing assembly abuts against the side wall of the seating seat to restrain the slag cleaning ring at the upper end of the stroke.

[0019] In a preferred embodiment, the refined sulfuric acid filtering device includes a controller for adjusting the working state of the driving 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, and 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 evenly distributed on the side wall.

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

[0022] 1. This refined sulfuric acid filtering device can remove the filter residue outside the filter element, and can backwash the filter element to remove the particles that penetrate into the internal pores of the filter element, thereby significantly improving the cleaning effect, which is beneficial to improving the filtering 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 release pressure. It is fast and efficient, and can be operated online to ensure 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 the refined sulfuric acid filtering device is located inside the filter element, and there is no need to reserve space in the tank body; the slag cleaning ring is driven up and down by the piston, and there is no need to set up a separate driving device; the overall structure of the device is simple and easy to implement.

[0025] 4. When the refined sulfuric acid filtering device uses the 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 filtering device. Therefore, compared with the previous backwashing technology, the refined sulfuric acid filtering 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 It is a schematic diagram of the overall structure of the refined sulfuric acid filtering device in the embodiment.

[0028] Figure 2 It is a 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 It is a schematic diagram of the matching structure of the tank body, the mounting seat and the piston in the embodiment.

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

[0035] Fig. 9 It is a schematic diagram of the working state of the refined sulfuric acid filtering device in the embodiment when it is operating normally.

[0036] Fig.10 It is a schematic diagram of the working state of the refined sulfuric acid filtering device during cleaning treatment in the embodiment.

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

[0038] Fig.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, mounting 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] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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 also Figure 1-Figure 10 As shown, the embodiment discloses a refined sulfuric acid filtering device, including a tank body 5, a plurality of filter elements 17, a backwashing mechanism and a slag cleaning ring 18;

[0042] A liquid inlet pipe 15 is connected to one side of the tank body 5, and the upper end of the tank body 5 is fixed with a number of mounting seats 7 equal to the number of filter elements 17, and all mounting 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 and connected to the mounting 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 mounting seat 7; thus, Fig. 9 As shown, the sulfuric acid in the tank 5 enters 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 driving assembly. The number of the piston 20 is equal to that of the push rod 14 and the filter element 17. The piston 20 is located in the seating seat 7 in the initial position, and the piston 20 moves 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 matched. The driving assembly is located outside the tank body 5 and is transmission-connected to the push rod 14. The driving 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 reversely penetrates the filter element 17 to backwash the filter element 17. The piston 20 is embedded with a first magnetic component 22.

[0044] There are multiple cleaning rings 18, which are respectively sleeved on the outside of each filter element 17, and the second magnetic component 24 is embedded in the cleaning ring 18; when the piston 20 moves up and down in the filter element 17, the corresponding first magnetic component 22 and the second magnetic component 24 can be coupled, and then the piston 20 drives the cleaning ring 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 is used as a sewage collection area 19 for collecting settled filter residues.

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

[0047] like Fig.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 inside of the filter element 17. During the downward movement of the piston 20 inside the filter element 17, the filtrate inside the filter element 17 below the piston 20 will increase in pressure and cannot flow in the direction of the outlet end. Therefore, it can only penetrate the filter layer of the filter element 17 in the reverse direction to enter the inside of the tank body 5, thereby backwashing the filter element 17; at the same time, the piston 20 is driven by the driving assembly to reciprocate up and down 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 oscillating manner, further improving the backwashing effect; during the movement of the piston 20 inside the filter element 17, after the first magnetic component is coupled with the second magnetic component, 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, and 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 concentrated for recovery.

[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 also Fig.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 portion of the filter element 17 is blocked, and the portion 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 refined sulfuric acid filtering device, the moving path of the piston 20 is located inside the filter element 17, and there is no need to reserve space in the tank body 5; the slag cleaning ring 18 is driven by the piston 20 to move up and down, and there is no need to set up a separate driving device; this makes the overall structure of the refined sulfuric acid filtering device relatively simple and easy to implement.

[0051] When the piston 20 of the refined sulfuric acid filtering device backwashes the filter element 17, the reverse flow of the filtrate is limited to the vicinity of the filter element 17 without changing the overall flow direction of the fluid inside the filtering device. Therefore, compared with the previous backwashing technology, the 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] The refined sulfuric acid filtering device involves refined sulfuric acid filtering, so the tank body 5, the placement seat 7, the slag cleaning ring 18, the piston 20 and the push rod 14 and other components need to have sulfuric acid corrosion resistance. Combined with the structural characteristics of the components, the requirements of sulfuric acid corrosion resistance can be effectively met by selecting acid-resistant materials (such as Hastelloy C-276, high silicon cast iron Durofer or polytetrafluoroethylene), setting acid-resistant linings (such as PTFE linings), surface coating or spraying acid-resistant protective layers, etc.; as for the first magnetic component 22 and the second magnetic component 24, they can be made of magnetic materials as a whole, and installed in the piston 20 and the slag cleaning ring 18 respectively through a sealing embedding process to avoid direct contact between the magnetic material and sulfuric acid. In addition, it can also be made by coating the magnetic material with acid-resistant materials or spraying acid-resistant coatings on the outside to meet the requirements of sulfuric acid corrosion resistance. Obviously, the above-mentioned technical means of sulfuric acid corrosion resistance have been widely used in the industrial field, and there are no technical obstacles in the implementation process.

[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 driving assembly is to drive the push rod 14 and the piston 20 to achieve precise up and down reciprocating motion. The driving assembly can adopt commonly used linear driving 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 filtering work during the cleaning process, the push rods 14 can be divided into several groups, and the driving assembly is correspondingly provided with multiple linear driving 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 driving assembly to collectively drive all the push rods 14, so as to improve the compactness of the structure of the refined sulfuric acid filtering device and reduce the operating energy consumption, and the specific preferred structure is:

[0055] See also Figure 1 , Figure 2 , Fig.11 As shown, the driving assembly includes a support frame 9, a driving 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 driving plate 13 is fixedly connected to the upper ends of all the push rods 14, and a screw sleeve 11 is fixed on the driving 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 matched 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 driving plate 13 and all the push rods 14 to rise and fall synchronously;

[0056] Further, such as Figure 6 , Fig.10 As shown, all the slag cleaning rings 18 are fixedly connected together by a plurality of longitudinal ribs 25 to form an integrated frame structure; based on the fact that 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 simultaneously, 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 lifting and lowering in sulfuric acid.

[0057] like Figure 7-Figure 9As shown, a side hole 26 is opened on the mounting seat 7, and the inner cavity of the mounting seat 7 is connected with 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 mounting 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 mounting seat 7, which can significantly reduce the load on the sliding seal between the push rod 14 and the mounting 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 to avoid cross-sectional obstruction of the flow channel and achieve a compact layout.

[0058] See also 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 a special tool 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 also Figure 1 , Fig.10 As shown, a sewage outlet is provided at the bottom of the sewage collection area 19, and the sewage outlet is sealed and connected to a collection container 3 for storing filter residues through a first sewage valve 4, and the lower end of the collection container 3 is connected to a sewage pipe 1 through a second sewage valve 2. During the normal operation of the refined sulfuric acid filtering device, the first sewage valve 4 remains in a fully open state to ensure that the filter residues accumulated in the sewage collection area 19 can flow smoothly into the collection container 3 by gravity, and the second sewage valve 2 remains in a closed state to prevent sulfuric acid leakage. When the filter residues are regularly cleaned, the first sewage valve 4 is closed first to safely isolate the sulfuric acid in the tank 5, and then the second sewage valve 2 is opened to discharge the filter residues in the collection container 3 through the sewage pipe 1. After the filter residues are emptied, the second sewage valve 2 is closed first, and then the first sewage valve 4 is opened to restore the refined sulfuric acid filtering device to its original operating state. The filter residues are removed in the above manner, and the operation is fast and efficient, and there is no need to interrupt the operation of the refined sulfuric acid filtering device, which can ensure the continuity of the production process. In addition, a mechanical interlocking or an electrically controlled 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 , Fig.10As shown, a brushing assembly 23 is fixed to the inner wall of the cleaning ring 18, and the brushing assembly 23 is used to brush and clean the outer wall of the filter element 17. The brushing assembly 23 is made of elastic material and can be a bristle or thorn structure. When the cleaning ring 18 moves up and down, the brushing assembly 23 slides against the outer wall of the filter element 17 with a constant contact pressure, which can effectively peel off the filter residue on the surface of the filter element 17 and avoid scratching 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 abuts against the side wall of the seating seat 7 to restrain the slag cleaning ring 18 at 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 restraining effect of the brushing assembly 23 and the seating seat 7, and then move synchronously with the piston 20.

[0062] See also Figure 1 , Figure 5 , Fig.10 As shown, the refined sulfuric acid filtering device also includes a controller (not shown), which is used to adjust the working state of the driving component; the tank body 5 is equipped with a first pressure detection device 6 for detecting the internal pressure thereof, and the lower side of the piston 20 is equipped with a second pressure detection device 21 for detecting the lower side pressure thereof, and the controller can adjust the downward movement speed of the piston 20 based on the data fed back by the first pressure detection device 6 and the second pressure detection device 21. Thus, during the backwashing process, the driving component can dynamically control the downward movement speed of the piston 20, so that the inside and outside of the filter element 17 maintain a preset constant pressure difference, ensure that the force of the backwashing can effectively strip the deep impurities in the pores of the filter element 17, ensure the backwashing effect, and avoid the filter element 17 from being damaged due to excessive internal pressure. During the normal working process of the refined sulfuric acid filtering device, the pressure in the tank body 5 can be determined based on the first pressure detection device 6, so as to judge the working state of the sulfuric acid filtering device.

[0063] See also Fig.12As shown, in another embodiment, a liquid inlet hole 27 is provided at the lower end of the piston 20, and liquid outlet holes 28 communicating with the liquid inlet hole 27 are evenly distributed on the side wall; 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, and the filter layer is sprayed and flushed from the inside to the outside, thereby further improving the backwashing effect.

[0064] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 the 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 placed filter elements; the tank body is connected to a liquid inlet pipe, a mounting seat is fixed at the upper end, and a liquid outlet pipe is connected to the mounting seat; the upper end of the filter element is an outlet end, and the outlet end is sealed and connected to the mounting seat; characterized in that, Also includes: The backwashing mechanism comprises a piston, a push rod and a driving assembly; the piston is located in the mounting seat in the initial position, fixedly connected to the lower end of the push rod, and embedded with a first magnetic component; the push rod extends to the top of the mounting seat and the two are sealed and slidably matched, and the push rod is in transmission connection with the driving assembly; the piston can move downward in the filter element, so that the filtrate pressure inside the filter element below the piston increases and reversely penetrates the filter element to achieve backwashing; A plurality of 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 so that the cleaning ring and the piston move synchronously 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, and a dirt collecting area is reserved between the lower end of the filter element and the bottom of the tank body.

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; 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 mounting seat, and a tool interface is provided at the lower end. 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 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 residues through a first sewage valve, and the lower end of the collection container is connected to a sewage pipe through a second sewage valve.

7. 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.

8. The purified sulfuric acid filtering device according to claim 7, 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 bind the slag cleaning ring at the upper end of the stroke.

9. The purified sulfuric acid filtering device according to claim 1, characterized in that: It includes a controller for adjusting the working state of the driving component, a first pressure detection device for detecting the internal pressure is installed on the tank body, and a second pressure detection device for detecting the pressure on the lower side 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.

10. The purified sulfuric acid filtering device according to claim 1, characterized in that: The lower end of the piston is provided with a liquid inlet hole, and the side wall is evenly distributed with liquid outlet holes communicating with the liquid inlet hole.

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