Pfa glass steel composite material anticorrosion storage tank

Abstract

This invention relates to the field of anti-corrosion storage tank technology, specifically a PFA fiberglass composite anti-corrosion storage tank. It includes a tank body equipped with a check valve, a stirring mechanism, a liquid suction unit, a transfer unit, and a filtration system. The filtration system is located outside the tank body and includes several filtration mechanisms and a vacuum pump. Both the filtration mechanisms and the vacuum pump are connected to the tank body via conduits. The vacuum pump extracts the solution containing precipitates from the tank body. The solution flows through the filtration mechanisms and then back to the tank body, driving the stirring mechanism to rotate. The stirring mechanism's zigzag support rod is designed with an arc shape that fits against the inner wall of the tank bottom, effectively scraping the bottom, preventing precipitate from caking, and lifting it into the solution. The liquid suction unit draws in the solution containing high concentrations of precipitates from the bottom and transports it to the external filtration system, solving the problem of traditional tanks where bottom precipitates are "stirred but not drained" or "not drained completely," thus improving precipitate removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of corrosion-resistant storage tank technology, and more particularly to a PFA fiberglass composite corrosion-resistant storage tank. Background Technology

[0002] Sodium hypochlorite, a strong oxidizing disinfectant and bleaching agent, is widely used in wastewater treatment, tap water disinfection, and textile and chemical industries. Storage tanks for sodium hypochlorite must be made of materials that can withstand the strong corrosiveness of the solution. Currently, PFA (perfluoroalkoxyalkane) fiberglass composite tanks have become the mainstream choice for storing this medium due to their excellent corrosion resistance and structural strength.

[0003] However, in practical use, sodium hypochlorite solutions are prone to precipitating inorganic salt crystals and other impurities, such as sodium chloride and sodium chlorate, due to prolonged standing. The accumulation of these precipitates at the bottom of the tank can cause a series of problems: First, the precipitates occupy effective volume, reducing the utilization rate of the storage tank; second, the precipitates may clog the discharge port, affecting normal drainage. Furthermore, sodium hypochlorite may slowly decompose and release chlorine gas during storage. If this is not handled promptly and safely, it can accumulate inside the tank, creating positive pressure and posing safety hazards, or even be directly released, causing environmental pollution.

[0004] To address sedimentation issues, existing technologies typically employ a bypass filtration and circulation system external to the storage tank. This system usually utilizes a removable filter screen structure for easy maintenance and replacement. To ensure the filter screen can withstand fluid impacts and maintain a seal during filtration, the conventional approach is to forcibly tighten it onto the mounting base using bolts, clamps, and other fasteners. However, in actual operating conditions, especially for solutions containing particles, the impact force of the fluid on the filter screen is not constant. On one hand, insufficient pre-tightening force of the fasteners can cause the filter screen to fret or rotate under long-term, pulsating fluid impacts, leading to seal failure and leakage of the solution through the bypass without effective filtration, severely impacting filtration efficiency. On the other hand, excessive pre-tightening force, while temporarily securing the filter screen, greatly complicates disassembly and maintenance. Improper operation may damage the filter screen or seals, increasing maintenance costs and downtime. Furthermore, bolts and other fasteners, when immersed in corrosive media for extended periods, are prone to rust and jamming, further exacerbating maintenance difficulties. Summary of the Invention

[0005] The main objective of this invention is to provide a PFA fiberglass composite anti-corrosion storage tank to solve the problems raised in related technologies.

[0006] To achieve the above objectives, according to one aspect of the present invention, a PFA fiberglass composite corrosion-resistant storage tank is provided, comprising a corrosion-resistant storage tank body equipped with a check valve, and a filtration mechanism externally disposed on the tank body. The filtration mechanism includes a filter support, a first filter, and a second filter, both located within the filter support and used for filtering a solution. The filter support is provided with a plurality of locking mechanisms. When filtration is performed, as solution flows through the filter, the locking mechanisms activate to lock the filter onto the filter support, thereby restricting the movement of the filter. When filtration stops, no solution flows through the filter, the locking mechanisms reset, no longer locking the filter, and the filter can be removed from the filter support.

[0007] Furthermore, the bottom of the anti-corrosion storage tank body is provided with a stirring mechanism, which includes a number of radially arranged zigzag support rods. A horizontal connecting rod is fixed between two adjacent zigzag support rods. A number of longitudinal connecting rods are fixed on the horizontal connecting rods. The longitudinal connecting rods are radially arranged, and a collar is fixed at their convergence point. The collar is fitted around the outer ring of the liquid absorption part.

[0008] Furthermore, the top of the zigzag support rod extends upward to form a vertical scraper, the top of the vertical scraper is fixedly provided with a connecting ring, the top of the zigzag support rod is fixedly provided with a support ring, and the support ring is supported on the inner wall of the anti-corrosion storage tank body.

[0009] Furthermore, the anti-corrosion storage tank body is provided with a liquid suction part, which includes a liquid suction rod. The liquid suction rod has a liquid suction chamber with an opening at the bottom. The side wall of the liquid suction rod has several liquid outlets. A liquid storage ring support is fixed on the outer wall. The bottom surface of the liquid storage ring support is located below the liquid outlet, and the top surface is located above the liquid outlet, which is used to receive the solution discharged from the liquid outlet.

[0010] Furthermore, a transition section is provided above the outer ring of the liquid absorption section. The transition section includes a liquid accumulation ring, a liquid accumulation chamber is provided inside the liquid accumulation ring, and an air intake port and a connecting pipe port are provided on the liquid accumulation ring. Both the air intake port and the connecting pipe port are connected to the liquid accumulation chamber.

[0011] Furthermore, the adapter also includes an inner protective tube, an exhaust pipe, a drain pipe, and a liquid accumulation ring seal. One end of the inner protective tube is connected to the connecting pipe port. The exhaust pipe and the drain pipe are both located inside the inner protective tube. One end of the exhaust pipe is connected to the air intake port. One end of the drain pipe extends into the liquid accumulation chamber. The liquid accumulation ring seal is fixedly connected to the liquid accumulation chamber.

[0012] Furthermore, the filter support includes a filter support frame, which has a through drain port and an open mesh cavity for accommodating the filter. The mesh cavity is provided with several inner sealing rings, which are fixedly connected to the filter support frame.

[0013] Furthermore, the first filter part includes a first filter screen with a column hole, and a left outer sealing ring is fixedly provided on one side of the first filter screen; the second filter part includes a second filter screen with a plurality of column grooves and a plurality of locking grooves for accommodating the locking mechanism, the locking grooves being located on the outer ring of the column grooves and communicating with the column grooves; a right outer sealing ring is fixedly provided on one side of the second filter screen.

[0014] Furthermore, the locking mechanism includes a horizontal locking post, which has a horizontal sliding cavity and a receiving cavity. The horizontal locking post has several sliding grooves, all of which communicate with the receiving cavity. One end of the receiving cavity is provided with a spring, one end of which is fixedly connected to the horizontal locking post, and the other end is fixedly provided with a round rod. A frustum is fixedly provided at the end of the round rod, and several push rods are fixedly provided on the side of the round rod. The push rods slide within the sliding grooves.

[0015] Furthermore, the horizontal locking post is also provided with a locking part, which includes an inner locking block and an outer locking block. The inner locking block is slidably disposed in the outer locking block. The inner locking block has inner sliding cavities on both opposite sides, and an inner spring is provided in the inner sliding cavity. The outer locking block has outer sliding cavities on both opposite sides, and an outer spring is provided in the outer sliding cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The filtration mechanism of this application cleverly utilizes the fluid pressure generated during the filtration process itself as the locking force. When the vacuum pump is started and the solution flows through the second filter screen, the fluid pressure pushes the second filter screen, triggering the locking mechanism, causing the inner and outer locking blocks to automatically engage with the locking groove, firmly locking the filter screen in the working position. This design ensures that when the filter screen is subjected to filtration impact, the locking force increases with the increase of fluid pressure, effectively preventing the filter screen from rotating or shifting due to pulsating impact, eliminating the risk of unfiltered solution leaking through the sealing interface, and ensuring the filtration effect.

[0017] 2. When the filter needs to be replaced or cleaned, simply turn off the vacuum pump; the fluid pressure will immediately disappear. At this time, the locking mechanism automatically resets and unlocks under the combined action of the spring's restoring force and the sealing ring's rebound force. The filter is then released from its locked state, allowing operators to easily remove it for maintenance without the need for complex tools. This design completely changes the problems of cumbersome disassembly and assembly, corrosion, and jamming caused by traditional filtration systems relying on bolt fastening. It avoids damage to the filter or seals, reducing maintenance difficulty, manpower, and time costs.

[0018] 3. This application places the fixing bolts, nuts and other metal fasteners on the outside of the sealing ring so that they do not come into direct contact with the corrosive sodium hypochlorite solution, effectively avoiding fastener failure and "seizing" caused by electrochemical corrosion, and extending the overall service life of the equipment in a highly corrosive environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall invention.

[0020] Figure 2 Cross-section of the present invention Figure 1 .

[0021] Figure 3 This is a schematic diagram of the stirring mechanism of the present invention.

[0022] Figure 4 Cross-section of the present invention Figure 2 .

[0023] Figure 5 This is a partially enlarged schematic diagram of the present invention. Figure 1 .

[0024] Figure 6 This is a partially enlarged schematic diagram of the present invention. Figure 2 .

[0025] Figure 7 This is a partially enlarged schematic diagram of the present invention. Figure 3 .

[0026] Figure 8 This is a cross-sectional view of the filtering mechanism of the present invention.

[0027] Figure 9 This is a partially enlarged schematic diagram of the present invention. Figure 4 .

[0028] Figure 10 This is a cross-sectional view of the locking mechanism of the present invention.

[0029] Figure 11 This is a cross-sectional view of the filter support portion of the present invention.

[0030] Figure 12 This is a cross-sectional view of the filter section of the present invention.

[0031] Reference numerals: 1. Corrosion-resistant storage tank body; 2. Check valve; 3. Outer protective pipe; 4. Air washing tank; 5. Filtration mechanism; 50. Locking part; 501. Inner locking block; 502. Outer locking block; 503. Inner sliding cavity; 504. Inner spring; 505. Inner stop block; 506. Outer slider; 507. Outer stop block; 508. Outer spring; 509. Outer sliding cavity; 51. Filter support frame; 511. Container cavity; 512. Drain outlet; 513. Inner sealing ring; 52. First filter screen; 521. Left outer sealing ring; 522. Container column hole; 53. Second filter screen; 531. Container column groove; 532. Container locking groove; 533. Right outer sealing ring; 54. Second chamber; 55. First chamber; 56. Horizontal locking column; 561. Horizontal shifting cavity; 562. Slide groove; 563. Push rod; 564. Cavity; 57. Frustum; 58. Round rod; 59. Spring; 6. Vacuum pump; 7. Stirring mechanism; 71. Folded support rod; 72. Horizontal connecting rod; 73. Longitudinal connecting rod; 74. Collar; 75. Support ring; 76. Vertical scraper; 77. Connecting ring; 78. Connecting rod; 79. Motor; 8. Adapter; 81. Liquid accumulation ring; 82. Liquid accumulation chamber; 83. Air intake; 84. Connecting pipe port; 85. Inner protective pipe; 86. Exhaust pipe; 87. Drain pipe; 88. Liquid accumulation ring sealing ring; 9. Liquid suction part; 91. Liquid suction rod; 92. Liquid outlet; 93. Liquid suction chamber; 94. Liquid storage ring support; 95. Liquid storage ring support sealing ring; 96. Liquid outlet gap; 10. Clean liquid pipe; 11. Air suction pipe. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0033] This embodiment provides a PFA fiberglass composite corrosion-resistant storage tank, such as... Figures 1-5 As shown, it includes a corrosion-resistant storage tank body 1, a check valve 2, an outer protective pipe 3, a gas scrubbing tank 4, a filtration system, a stirring mechanism 7, a connecting part 8, and a liquid suction part 9.

[0034] The corrosion-resistant storage tank body 1 is used to store sodium hypochlorite solution. Its tank structure is made of composite materials, with an inner wall lined with a layer of perfluoroalkoxyalkylene (PFA) anti-corrosion coating and an outer layer of fiberglass reinforced plastic (FRP) reinforcement, together providing corrosion resistance and sufficient mechanical strength. To protect internal components and replenish air into the tank, a check valve 2 is installed on the top of the tank. When the tank is under negative pressure, external air enters the tank through check valve 2, balancing the internal and external pressures. When the internal pressure is positive, check valve 2 closes to prevent gas leakage. All components inside the tank that come into direct contact with the sodium hypochlorite solution are coated with a PFA anti-corrosion coating to prevent corrosion.

[0035] The stirring mechanism 7 is located in the central area of ​​the inner bottom of the corrosion-resistant storage tank body 1 and can rotate around its central axis. It is used to stir the solution at the bottom of the tank, slow down sediment formation, and scrape up the sediment at the bottom. Figure 3 As shown, the stirring mechanism 7 includes several radially arranged zigzag support rods 71. The bending curvature of the zigzag support rods 71 ​​is specially designed to be basically consistent with the bending curvature of the inner wall of the bottom of the anti-corrosion storage tank body 1, thereby ensuring that it can closely adhere to the inner wall of the tank bottom when rotating, achieving an effective scraping effect. To enhance structural stability, adjacent zigzag support rods 71 ​​are fixedly connected by a horizontal connecting rod 72. Several longitudinal connecting rods 73 are vertically fixed on the horizontal connecting rod 72. These longitudinal connecting rods 73 converge radially to the center and are jointly fixedly connected to a collar 74. The collar 74 is rotatably connected to the suction rod 91 of the liquid suction part 9, supporting the stirring mechanism 7 on the suction rod 91, so that the stirring mechanism 7 can rotate smoothly. The top of the zigzag support rod 71 extends upward to form a vertical scraper 76. A connecting ring 77 is fixedly provided at the top of the vertical scraper 76, connecting multiple vertical scrapers 76 into a whole, improving the verticality of the vertical scraper 76, so that it can closely adhere to the inner wall of the tank and scrape off the sediment adhering to the inner wall. A support ring 75 is fixedly provided at the top of the zigzag support rod 71. The outer edge of the support ring 75 is supported on the inner side wall of the anti-corrosion storage tank body 1, playing a role in auxiliary support and centering. To reduce friction, ball bearings (not shown in the figure) can be provided at the contact point between the support ring 75 and the tank wall to convert sliding friction into rolling friction.

[0036] The suction section 9 is coaxially positioned above the center of the stirring mechanism 7 and is fixedly connected to the stirring mechanism 7, allowing it to rotate synchronously with it. The suction section 9 is used to remove solutions containing precipitates from the bottom of the tank. For example... Figure 5 As shown, the liquid suction part 9 includes a vertical liquid suction rod 91, the top of which is fixedly connected to the anti-corrosion storage tank body 1. The liquid suction rod 91 has a liquid suction chamber 93 with an opening at the bottom, and several liquid outlets 92 are formed on its side wall. An L-shaped liquid storage ring support 94 is fixedly installed on the outer wall of the liquid suction rod 91. The bottom surface of the liquid storage ring support 94 is below the liquid outlets 92, and the top surface is above the liquid outlets 92, used to collect the solution flowing out from the liquid outlets 92. A distance is left between the bottom end of the liquid suction rod 91 and the top surface of the zigzag support rod 71 of the stirring mechanism 7, forming a liquid outlet gap 96 between the bottom end of the liquid suction rod 91 and the inner wall of the bottom of the anti-corrosion storage tank body 1. Figure 7As shown. Each of the zigzag support rods 71 ​​is fixedly connected to the others via connecting rods 78. A motor 79 is installed inside the bottom inner wall of the corrosion-resistant storage tank body 1. The output shaft of the motor 79 is fixedly connected to the connecting rods 78 to drive the stirring mechanism to rotate. The bottom surface of the inner wall of the corrosion-resistant storage tank body 1 is designed to be inclined, extending towards the liquid outlet gap 96. When the sodium hypochlorite solution is still, the precipitated inorganic salts settle at the bottom of the tank under gravity. The precipitate in the bottom area slides towards the liquid outlet gap 96, and the solution containing the precipitate enters the suction chamber 93 through the liquid outlet gap 96, rises along the chamber, and finally overflows from the liquid outlet 92, falling into the liquid storage ring support 94.

[0037] The adapter 8 is fixedly positioned above the outer ring of the liquid suction section 9, higher than the highest liquid level under normal operating conditions of the storage tank, to reduce corrosion. The adapter 8 encloses an annular liquid accumulation ring 81, with an annular liquid accumulation cavity 82 inside. The liquid accumulation ring 81 has a suction port 83 and a connecting pipe port 84, both communicating with the liquid accumulation cavity 82. A liquid accumulation ring sealing ring 88 is fixedly installed inside the liquid accumulation cavity 82. A liquid storage ring support 94 is located inside the liquid accumulation cavity 82, and a liquid storage ring support sealing ring 95 is fixedly installed on its inner side. Figure 6 As shown. The liquid storage ring support sealing ring 95 is inserted into the corresponding annular groove of the liquid accumulation ring sealing ring 88, forming a rotational seal connection to prevent component corrosion. The adapter part 8 also includes an inner protective pipe 85, an exhaust pipe 86, and a drain pipe 87. One end of the inner protective pipe 85 is fixedly connected to the connecting pipe port 84, and the other end passes through the anti-corrosion storage tank body 1 and connects to the external outer protective pipe 3. The exhaust pipe 86 and the drain pipe 87 are arranged in parallel inside the inner protective pipe 85. One end of the exhaust pipe 86 is connected to the air intake port 83, and the other end extends to the external air scrubbing tank 4. One end of the drain pipe 87 extends into the liquid accumulation chamber 82, and its port is located inside the liquid storage ring support 94, used to extract the solution containing precipitate collected in the liquid storage ring support 94; the other end of the drain pipe 87 extends to the drain port 512 of the filtration system. Above the liquid level inside the tank, a suction pipe 11 is installed. One end of the suction pipe 11 is connected to the suction port 83 of the adapter 8, and the other end opens into the gas phase space inside the tank. A one-way valve and a pressure sensor can be installed inside the suction pipe 11. When the gas pressure inside the tank exceeds the set value, an external air pump (not shown in the figure) can be activated to draw the gas into the gas scrubbing tank 4 through the exhaust pipe 86. The gas scrubbing tank 4 contains an alkaline solution such as sodium hydroxide solution to neutralize the chlorine gas overflowing from the sodium hypochlorite solution and to render the discharged gas harmless.

[0038] The filtration system is located outside the corrosion-resistant storage tank body 1 and is used to filter and purify solutions containing precipitates. It includes a vacuum pump 6 and multiple filtration units 5 connected in sequence via conduits; in this embodiment, two filtration units 5 are selected. The inlet of the vacuum pump 6 is connected to the drain port 512 via a pipe, which generates negative pressure on the drain pipe 87 and the suction chamber 93, drawing the solution containing precipitates into the suction chamber 93 for filtration. The outlet of the vacuum pump 6 is connected to the clean liquid pipe 10 via a pipe, sending the filtered clean liquid back into the tank body from the clean liquid pipe 10.

[0039] The filter mechanism 5 is responsible for trapping solid particles. It includes a filter support, a first filter section, and a second filter section. Figure 11 As shown, the filter support includes a filter support frame 51. The filter support frame 51 has a through-hole drain port 512, and an open mesh chamber 511 is machined inside to accommodate the first filter section and the second filter section. Two annular inner sealing rings 513 are fixedly embedded on both sides of the mesh chamber 511.

[0040] like Figure 12 As shown, the first filter section includes a first filter screen 52. The first filter screen 52 is typically a coarser screen used for primary filtration. A left outer sealing ring 521 is fixedly provided on one side, and a column-shaped hole 522 is formed on the same side. The second filter section includes a second filter screen 53. The second filter screen 53 is typically a fine filter screen. A right outer sealing ring 533 is fixedly provided on one side, and several column-shaped grooves 531 and several locking grooves 532 communicating with them are formed on the same side. Both the first filter screen 52 and the second filter screen 53 are installed within the mesh cavity 511, and are tightly fitted together by a sealing gasket (not shown in the figure). After installation, as... Figure 8 As shown, a first chamber 55 is formed between the first filter screen 52 and the filter support frame 51, and the left outer sealing ring 521 and the corresponding inner sealing ring 513 are tightly fitted within this chamber; a second chamber 54 is formed between the second filter screen 53 and the filter support frame 51, and the right outer sealing ring 533 and the corresponding inner sealing ring 513 are tightly fitted within this chamber. These elastic sealing rings are compressed during installation and spring back after installation, ensuring a seal between the chambers.

[0041] The locking mechanism is used to automatically lock the second filter screen 53 during the filtration process, preventing it from rotating or shifting. For example... Figure 9As shown, the locking mechanism includes a horizontal locking post 56 fixed to the filter support frame 51. The horizontal locking post 56 is directly opposite the receiving groove 531 on the second filter screen 53. The horizontal locking post 56 has a communicating transverse moving cavity 561 and a receiving cavity 564 inside, and a sliding groove 562 communicating with the receiving cavity 564 is opened on its side. A round rod 58 is slidably disposed in the receiving cavity 564. One end of the round rod 58 is connected to the horizontal locking post 56 by a spring 59, and the other end is fixedly connected to a frustum 57 slidably disposed in the transverse moving cavity 561. The large end of the frustum 57 faces outward and the small end faces inward. A push rod 563 is fixed to the side of the round rod 58, and the outer end of the push rod 563 protrudes out of the horizontal locking post 56 through the sliding groove 562.

[0042] When spring 59 naturally extends, the outer side of the large end of frustum 57 is flush with the outer side of transverse cavity 561. When the second filter screen 53 is installed in the filter support frame 51, the transverse locking post 56 is directly opposite and attached to the column groove 531, but does not extend into the column groove 531. When solution flows through the second filter screen 53, due to the filtering effect of the second filter screen 53, the solution accumulates on one side of the second filter screen 53, generating pressure on the second filter screen 53, causing the second filter screen 53 to move towards the transverse locking post 56. The transverse locking post 56 inserts into the column groove 531. When the side wall of the second filter screen 53 presses against the push rod 563, it pushes the push rod 563 to move outward, spring 59 contracts, and drives frustum 57 to move towards locking part 50. When the inclined surface of frustum 57 contacts inner locking block 501, it pushes inner locking block 501 to move upward, causing inner spring 504 to contract. When inner spring 504 is compressed to its maximum extent, inner spring 504... The inner stop block 505 drives the outer locking block 502 to move upward, so that the outer locking block 502 and the inner locking block 501 are located in the corresponding locking groove 532. When the spring 59 is compressed to the maximum extent, the inner locking block 501 still does not cross the truncated cone 57. When filtration stops, the hypochlorous acid solution no longer impacts the filter screen, the spring 59 rebounds, and pushes the truncated cone 57 to the outer end of the horizontal locking post 56. The inner locking block 501 and the outer locking block 502 slide down the inclined surface of the truncated cone 57 under the rebound force of the inner spring 504 and the outer spring 508, respectively, so that the outer locking block 502 and the inner locking block 501 slide out of the locking groove 532, releasing the lock on the second filter screen 53, making it easy to remove the filter screen. During the filtration process, the impact of the hypochlorous acid solution on the filter screen causes the second filter screen 53 to continuously press the push rod 563, which in turn causes the truncated cone 57 to always lift the inner locking block 501 upwards, maintaining the state in which the outer locking block 502 and the inner locking block 501 are inserted into the locking groove 532. The spring 59 has a small stiffness coefficient and can be compressed under a small pressure. Therefore, even if the impact of the sodium hypochlorite solution on the filter screen is not constant, the spring 59 can be compressed to insert the inner locking block 501 and the outer locking block 502 into the locking groove 532, thereby locking the second filter screen 53 in a specific position. Furthermore, since the horizontal locking post 56 is inserted into the column groove 531, it restricts the second filter screen 53, preventing the second filter screen 53 from moving up and down, thereby restricting the second filter screen 53 to the filter support frame 51 and preventing the second filter screen 53 from rotating and causing the solution to leak out. The second filter screen 53 and the first filter screen 52 are located opposite the drain port 512 as filter screens, and the other parts are filter screen mounting brackets. The outer surface of the filter screen mounting brackets where the second filter screen 53 and the first filter screen 52 are in contact is provided with a sealing gasket to prevent easy leakage between the two and to increase the friction between the two to prevent relative rotation between them, ensuring that when solution flows through, the second filter screen 53 and the first filter screen 52 are locked on the filter support frame 51.When the filter screen needs to be replaced, turn off the vacuum pump 6. The solution stops flowing through the filter screen and no longer compresses it. The second filter screen 53 moves to the left under the restoring force of the right outer sealing ring 533 and the corresponding inner sealing ring 513, no longer compressing the push rod 563. The spring 59 rebounds and pushes the round plate 57 to the left through the round rod 58, moving it away from the bottom of the inner locking block 501 and the outer locking block 502. The inner locking block 501 and the outer locking block 502 slide downwards and reset under the restoring force of the inner spring 504 and the outer sliding cavity 509, respectively, entering the transverse moving cavity 561. It no longer obstructs the movement or rotation of the second filter screen 53. The second filter screen 53 continues to move to the left under the restoring force of the right outer sealing ring 533 and the corresponding inner sealing ring 513 until the receiving column groove 531 leaves the transverse locking column 56. Unscrew the nut to remove the filter screen. The second filter screen 53, the first filter screen 52, and the filter support frame 51 are all provided with holes for bolts to pass through. After the second filter screen 53 and the first filter screen 52 are installed in the filter support frame 51, the bolts are passed through the holes and nuts are tightened to fix the second filter screen 53 and the first filter screen 52 on the filter support frame 51.

[0043] A locking part 50 is also provided at the end of the horizontal locking post 56, such as Figure 10 As shown, the locking part 50 includes an inner locking block 501 and an outer locking block 502 that can slide relative to each other. The inner locking block 501 is slidably disposed in the outer locking block 502. The inner locking block 501 has an inner sliding cavity 503 on both sides opposite to each other, and an inner spring 504 is disposed in the inner sliding cavity 503. The outer locking block 502 has an outer sliding cavity 509 on both sides opposite to each other, and an outer spring 508 is disposed in the outer sliding cavity 509. An inner stop 505 is fixedly installed on the upper inner side of the outer locking block 502, corresponding to the inner sliding cavity 503. One end of the inner spring 504 is fixedly connected to the inner stop 505, and the other end is fixedly connected to the inner locking block 501. An outer stop 507 is fixedly installed on the outer side of the horizontal locking post 56, corresponding to the outer sliding cavity 509. An outer slider 506 is provided at the bottom of the outer sliding cavity 509, and the outer slider 506 is fixedly connected to the outer locking block 502. One end of the outer spring 508 is fixedly connected to the outer stop 507, and the other end is fixedly connected to the outer slider 506. The outer locking block 502 and the horizontal locking post 56 are slidably connected. When the inner spring 504 and the outer spring 508 extend naturally, the top of the inner locking block 501 is flush with the top of the outer locking block 502, and both are flush with the outer surface of the horizontal locking post 56, which does not hinder the movement of the second filter screen 53. The bottom of the inner locking block 501 extends out of the bottom of the outer locking block 502 and abuts against the inclined surface of the frustum 57 which is in a state of no external force. The outer locking block 502 guides the inner locking block 501 to prevent the inner locking block 501 from deviating and getting stuck when it slides upward.

[0044] Several horizontal columns are fixedly provided at the corresponding locations of the column holes 522 of the filter support frame 51 and the first filter screen 52.

[0045] When installing the filter screen, first install the first filter screen 52, aligning the column hole 522 of the first filter screen 52 with the horizontal column on the filter support frame 51. Press the first filter screen 52 against the first chamber 55, inserting the horizontal column into the column hole 522, and causing the left outer sealing ring 521 and the corresponding inner sealing ring 513 to retract, leaving space for the installation of the second filter screen 53. Then install the second filter screen 53 in the filter screen cavity 511, tightly against the first filter screen 52. Release the first filter screen 52, and the left outer sealing ring 521 and the corresponding inner sealing ring 513 will spring back, pushing the second filter screen 53 towards the second chamber 54. Since the column groove 531 is directly opposite the horizontal locking post 56, after the left outer sealing ring 521 and the corresponding inner sealing ring 513 have fully springed back, the horizontal locking post 56 will insert into the corresponding column groove 531, allowing the first filter screen 52 and the second filter screen 53 to move only along the direction of the horizontal locking post 56, preventing the filter screens from moving up and down. After passing the bolts through the holes of the filter support frame 51, the first filter screen 52, and the second filter screen 53 in sequence, tighten the nuts. At this time, the left outer sealing ring 521 and the right outer sealing ring 533 are tightly attached to the corresponding inner sealing ring 513, and the bolts and nuts are located on the outside of the sealing rings, so they will not come into contact with the hypochlorous acid solution, thus avoiding corrosion of the bolts and nuts and loss of fixing function.

[0046] The bolts and nuts only serve as auxiliary fixing, and even after the bolts and nuts are tightened, the filter screen can still slide on the filter support frame 51, without affecting the locking part 50 locking the second filter screen 53.

[0047] Its working principle is as follows: When the vacuum pump 6 starts, the solution first flows through the first filter screen 52, and then through the second filter screen 53. Due to the filtration resistance, the second filter screen 53 is pushed by the liquid pressure and moves towards the horizontal locking post 56, causing the horizontal locking post 56 to insert into the receiving post groove 531. The push rod 563 drives the round rod 58 and the frustum 57 to move inward, compressing the spring 59. The inclined surface of the frustum 57 pushes the inner locking block 501 upward, and then drives the outer locking block 502 upward through the inner stop block 505, finally causing the tops of the inner locking block 501 and the outer locking block 502 to lock into the receiving locking groove 532 of the second filter screen 53, achieving automatic locking. When it is necessary to replace the filter screen and the vacuum pump is stopped, the liquid pressure disappears, and the second filter screen 53 moves outward under the action of the sealing ring's rebound force, no longer pressing the push rod 563. The spring 59 returns to its original position, pushing the frustum 57 outward, disengaging from pushing the inner locking block 501. The inner locking block 501 and the outer locking block 502 slide down and reset under the action of their respective springs, disengaging from the locking groove 532. The horizontal locking post 56 also exits from the locking post groove 531, and the second filter screen 53 and the first filter screen 52 can be easily removed.

[0048] The gas scrubbing tank 4 contains an alkaline absorbent liquid (such as sodium hydroxide solution). The chlorine-containing gas discharged from the exhaust pipe 86 is absorbed and neutralized in the gas scrubbing tank 4, and converted into harmless salts, thus achieving safe emission of the exhaust gas.

[0049] The workflow of this invention is briefly described as follows: An external vacuum pump 6 is started to extract the solution containing sediment from the bottom of the storage tank and pump it into the filtration mechanism 5. The filtered clean solution flows back into the corrosion-resistant storage tank body 1 through the clean liquid pipe 10. A motor 79 drives the stirring mechanism 7 to rotate. The rotating stirring mechanism 7 scrapes the bottom and walls of the tank to prevent sediment from accumulating and adhering. The vacuum pump 6 continuously draws in the high-concentration solution containing sediment from the bottom and lifts it to the liquid storage ring 94 in the transfer section 8, and then introduces it into the filtration system through the drain pipe 87 for filtration, forming a continuous internal circulation purification. Simultaneously, any gases that may be generated inside the tank can be introduced into the gas scrubbing tank 4 for harmless treatment through the suction pipe 11, the transfer section 8, and the exhaust pipe 86. The entire system achieves efficient synergy between sedimentation prevention, online filtration, and waste gas treatment, and the stirring power originates from the system itself, making it energy-efficient and highly effective.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A PFA fiberglass composite corrosion-resistant storage tank, comprising a corrosion-resistant storage tank body (1) equipped with a check valve (2), characterized in that, The corrosion-resistant storage tank body (1) is provided with a filter mechanism (5) on the outside. The filter mechanism (5) includes a filter support, a first filter and a second filter. The first filter and the second filter are both located inside the filter support and are used to filter the solution. The filter support is provided with several locking mechanisms. When filtering, when a solution flows through the filter, the locking mechanism is activated to lock the filter on the filter support, thereby restricting the movement of the filter. When filtering stops, no solution flows through the filter, the locking mechanism resets and no longer locks the filter, so the filter can be removed from the filter support.

2. The PFA fiberglass composite corrosion-resistant storage tank according to claim 1, characterized in that, The bottom of the anti-corrosion storage tank body (1) is provided with a stirring mechanism (7). The stirring mechanism (7) includes several radially arranged zigzag support rods (71). A horizontal connecting rod (72) is fixed between two adjacent zigzag support rods (71). Several longitudinal connecting rods (73) are fixed on the horizontal connecting rods (72). The longitudinal connecting rods (73) are radial, and a collar (74) is fixed at their convergence point. The collar (74) is sleeved on the outer ring of the liquid absorption part (9).

3. The PFA fiberglass composite corrosion-resistant storage tank according to claim 2, characterized in that, The top of the zigzag support rod (71) extends upward to form a vertical scraper (76), and a connecting ring (77) is fixedly provided at the top of the vertical scraper (76). A support ring (75) is fixedly provided at the top of the zigzag support rod (71), and the support ring (75) is supported on the inner wall of the anti-corrosion storage tank body (1).

4. The PFA fiberglass composite corrosion-resistant storage tank according to claim 2, characterized in that, The anti-corrosion storage tank body (1) is provided with a liquid suction part (9), which includes a liquid suction rod (91). The liquid suction rod (91) has a liquid suction chamber (93) with an opening at the bottom. The side wall of the liquid suction rod (91) has several liquid outlets (92). The outer wall is fixedly provided with a liquid storage ring support (94). The bottom surface of the liquid storage ring support (94) is located below the liquid outlet (92), and the top surface is located above the liquid outlet (92), which is used to receive the solution discharged from the liquid outlet (92).

5. The PFA fiberglass composite corrosion-resistant storage tank according to claim 4, characterized in that, The liquid absorption part (9) is provided with a transition part (8) above the outer ring. The transition part (8) includes a liquid accumulation ring (81). The liquid accumulation ring (81) is provided with a liquid accumulation chamber (82). The liquid accumulation ring (81) is provided with an air intake (83) and a connecting pipe (84). The air intake (83) and the connecting pipe (84) are both connected to the liquid accumulation chamber (82).

6. The PFA fiberglass composite corrosion-resistant storage tank according to claim 5, characterized in that, The adapter (8) also includes an inner protective tube (85), an exhaust pipe (86), a drain pipe (87), and a liquid accumulation ring seal (88). One end of the inner protective tube (85) is connected to the connecting pipe port (84). The exhaust pipe (86) and the drain pipe (87) are both located inside the inner protective tube (85). One end of the exhaust pipe (86) is connected to the air intake port (83). One end of the drain pipe (87) extends into the liquid accumulation chamber (82). The liquid accumulation ring seal (88) is located inside the liquid accumulation chamber (82) and is fixedly connected to the liquid accumulation ring (81).

7. The PFA fiberglass composite corrosion-resistant storage tank according to claim 1, characterized in that, The filter support includes a filter support frame (51), which has a through drain port (512) and an open mesh chamber (511) for accommodating the filter. The mesh chamber (511) is provided with a plurality of inner sealing rings (513), which are fixedly connected to the filter support frame (51).

8. The PFA fiberglass composite corrosion-resistant storage tank according to claim 1, characterized in that, The first filter part includes a first filter screen (52), on which a column hole (522) is provided, and a left outer sealing ring (521) is fixedly provided on one side of the first filter screen (52); the second filter part includes a second filter screen (53), on which a plurality of column grooves (531) and a plurality of locking grooves (532) for accommodating the locking mechanism are provided, and the locking grooves (532) are located on the outer ring of the column grooves (531) and communicate with the column grooves (531); a right outer sealing ring (533) is fixedly provided on one side of the second filter screen (53).

9. The PFA fiberglass composite corrosion-resistant storage tank according to claim 1, characterized in that, The locking mechanism includes a horizontal locking post (56), which has a horizontal sliding cavity (561) and a receiving cavity (564). The horizontal locking post (56) has several sliding grooves (562), which are all connected to the receiving cavity (564). One end of the receiving cavity (564) is provided with a spring (59), one end of which is fixedly connected to the horizontal locking post (56), and the other end is fixedly provided with a round rod (58). The end of the round rod (58) is fixedly provided with a frustum (57), and several push rods (563) are fixedly provided on the side of the round rod (58). The push rods (563) are slidably disposed in the sliding grooves (562).

10. The PFA fiberglass composite corrosion-resistant storage tank according to claim 9, characterized in that, The horizontal locking post (56) is also provided with a locking part (50), which includes an inner locking block (501) and an outer locking block (502). The inner locking block (501) is slidably disposed in the outer locking block (502). The inner locking block (501) has an inner sliding cavity (503) on both sides opposite to each other. An inner spring (504) is provided in the inner sliding cavity (503). The outer locking block (502) has an outer sliding cavity (509) on both sides opposite to each other. An outer spring (508) is provided in the outer sliding cavity (509).

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