Chemical wastewater impurity filtering equipment

Abstract

The application provides a chemical wastewater impurity filtering equipment and relates to the technical field of chemical wastewater filtering. The application discloses a chemical wastewater impurity filtering equipment, which relates to the technical field of chemical wastewater filtering and comprises a filtering tower. The sand layer is broken during backwashing, the sand clusters are broken, and the filtering efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of chemical wastewater filtration technology, specifically to a chemical wastewater impurity filtration device. Background Technology

[0002] In treating complex chemical wastewater, filtration equipment plays a crucial role, its primary task being to remove insoluble solid particulate impurities from the water. To ensure the smooth progress of subsequent treatment steps and improve the overall treatment effect, a key pretreatment step is the use of sand filters for chemical wastewater pretreatment. A sand filter acts like a precision "filter," effectively intercepting and removing suspended solids, potential microorganisms, and some organic matter from the wastewater. In practice, the chemical wastewater is evenly distributed onto a filter media layer. This filter media is typically composed of granular materials such as quartz sand, which have specific particle sizes and pore structures. As the wastewater slowly flows through this filter media, impurities in the water are captured by the quartz sand and other filter media through physical interception and chemical adsorption, much like the water passing through multiple checkpoints. Through this process, the turbidity of the chemical wastewater is significantly reduced, and the water quality is initially purified, laying a good foundation for subsequent, more refined treatment.

[0003] Referring to Chinese patent document CN206434949U, entitled "A Novel Pretreatment Quartz Sand Filter", this device improves the filtration effect by collecting the settled impurities in an impurity storage tank through an impurity conduit, and uniformly distributing the water to be filtered through a diversion baffle. At the same time, by controlling the operation of the water pump, the water spray head washes the quartz sand filter media, and changes the arrangement of the quartz sand filter media during the washing process, thereby improving the filtration effect.

[0004] Regarding the above technical solution, after filtering a certain amount of chemical wastewater, a large number of impurities will adhere to the surface of the quartz sand filter media. It is necessary to wash away the impurities on the quartz sand filter media to remove them. At this time, backwashing of the quartz sand filter media is required. During backwashing, because the quartz sand filter media is piled up in the filter layer, it is not easy to break up and clean the quartz sand filter media layer. Moreover, because the quartz sand filter media is piled up relatively tightly, some of the quartz sand filter media clumps together, which is difficult to break up during the backwashing process, affecting the cleaning efficiency. Summary of the Invention

[0005] In view of this, this application provides a chemical wastewater impurity filtration device, which aims to solve the problem of difficult sand clumps in sand layers.

[0006] The chemical wastewater impurity filtration equipment provided in this application adopts the following technical solution, including a filter tower, a liquid inlet mechanism set above the filter tower, a discharge port opened on the side wall of the filter tower, and a water outlet opened at the bottom of the filter tower; a sand-separating plate is fixedly connected to the inner side wall of the filter tower, a baffle plate is slidably connected to the end of the sand-separating plate near the top of the filter tower, a connecting sleeve is fixedly connected to the center of the sand-separating plate, a liquid inlet is opened at the bottom of the filter tower, the connecting sleeve is sleeved in the liquid inlet, a first sleeve is slidably connected in the connecting sleeve, and the first sleeve and the baffle plate are fixedly connected, an extension rod for breaking the condensed filter sand layer is fixedly connected to the outer side wall of the first sleeve, a second sleeve is slidably connected in the first sleeve, a water injection port communicating with the inside of the connecting sleeve is opened on the connecting sleeve, a first pressure relief hole is opened on the side wall of the first sleeve, a second pressure relief hole is opened on the second sleeve, and the first pressure relief hole and the second pressure relief hole are staggered.

[0007] By directly introducing liquid into the sand layer, the fluidity of the filter sand is improved, which increases the contact area between the filter sand and the wastewater during the subsequent preliminary filtration of chemical wastewater, thereby increasing the filtration efficiency. At the same time, the already coagulated sand clumps are broken up, reducing filtration resistance and improving filtration effect and efficiency.

[0008] Optionally, the liquid inlet mechanism includes a liquid inlet pipe fixedly connected to the top of the filter tower, a driven pipe slidably sleeved in the liquid inlet pipe, a water distribution pipe fixedly connected to the axial side wall of the driven pipe, a water distribution hole opened on the side wall of the water distribution pipe, the water distribution pipe and the driven pipe are connected, and the driven pipe and the liquid inlet pipe are connected.

[0009] By rotating the water distribution pipe, the impact force of wastewater entering the filter tower is reduced, making the sand layer for filtration smoother.

[0010] Optionally, a strip scraper is fixedly connected to the lower part of the water distribution pipe, and the strip scraper is used to scrape off the solid impurities remaining on the barrier plate.

[0011] During the operation of the filtration equipment, fine solid impurities gradually accumulate on the barrier plate. If these impurities are not treated, they will gather on the surface of the barrier plate and move and accumulate further away from the center, easily forming a thick, dense layer of impurities. This thick layer acts as a barrier, greatly increasing the resistance to water flow, slowing down the flow and reducing filtration efficiency. By moving solid impurities away from the center of the barrier plate and preventing excessive accumulation there, the surface of the barrier plate can be kept relatively clean and unobstructed, thus significantly reducing filtration resistance, ensuring smooth water flow, and ultimately improving overall filtration efficiency.

[0012] Optionally, a sealing sleeve is slidably connected to the liquid inlet of the filter tower. The inner side wall of the sealing sleeve abuts against the outer side wall of the connecting sleeve, and the outer side wall of the sealing sleeve abuts against the side wall of the liquid inlet of the filter tower. A sealing baffle is fixedly connected to the sealing sleeve. A blocking block is provided on the sealing baffle. A liquid outlet is provided on the sand-separating plate, and the blocking block is provided corresponding to the liquid outlet.

[0013] After a period of use, sand layers gradually agglomerate into dense clumps due to trapped impurities and particles. While this agglomeration can adsorb impurities to some extent, it also significantly increases the resistance to water flow through the sand layer, leading to a slower filtration speed and reduced efficiency. Breaking up the sand clumps effectively reduces the overall compaction of the sand layer, thereby significantly reducing the resistance encountered by water flow. The filtration speed increases, the time required to process the same volume of water is shortened, and the filtration efficiency also improves. Breaking up the sand clumps helps restore and improve the internal pore structure of the sand layer, resulting in a more uniform and unobstructed pore distribution. This not only effectively prevents the sand layer from prematurely losing its filtration capacity due to localized blockages but also significantly extends the stable operating cycle of the entire filtration system. Because the permeability of the sand layer is improved, the system is less prone to rapid saturation, thus greatly reducing the frequency of backwashing.

[0014] Optionally, a return spring is fixedly connected to the sealing sleeve. The end of the return spring away from the sealing sleeve is fixedly connected to the connecting sleeve. The return spring is used to push the sealing sleeve to move downward, thereby disconnecting the connection between the sealing sleeve and the inner wall of the connecting sleeve.

[0015] During the filtration process of filter sand, the openings on the sand baffle plate are blocked to reduce the amount of liquid required for cleaning, thereby reducing the amount of liquid used and the generation of wastewater, alleviating the pressure on subsequent wastewater treatment, and ensuring the cleanliness of the sand layer.

[0016] Optionally, a limiting block is fixedly connected to the side wall of the filter tower, the limiting block being used to limit the upward movement height of the barrier plate when it moves upward.

[0017] Optionally, a push spring is fixedly connected to one end of the second sleeve near the barrier plate, and the other end of the push spring away from the second sleeve is fixedly connected to the first sleeve. The push spring is used to push the second sleeve to move downward.

[0018] Optionally, the first pressure relief holes are axially arrayed on the first sleeve, and the diameter of the first pressure relief holes gradually decreases in the direction close to the baffle plate.

[0019] Optionally, the second pressure relief holes are axially arrayed on the second sleeve, and the diameter of the second pressure relief holes gradually decreases in the direction close to the baffle plate.

[0020] Optionally, the extension rod is configured as a rhombus shape.

[0021] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0022] 1. By directly introducing liquid into the sand layer, the fluidity of the filter sand is improved, which increases the contact area between the filter sand and the wastewater during the subsequent preliminary filtration of wastewater, thereby increasing the filtration efficiency. At the same time, the already coagulated sand clumps are broken up, reducing filtration resistance and improving filtration effect and efficiency.

[0023] 2. During the operation of the filtration equipment, fine solid impurities gradually accumulate on the baffle plate. If these impurities are not treated, they will gather on the surface of the baffle plate and move and accumulate in areas away from the center, easily forming a thick, dense layer of impurities. This thick layer acts as a barrier, greatly increasing the resistance to water flow, slowing down the flow and reducing filtration efficiency. By moving solid impurities away from the center of the baffle plate and preventing excessive accumulation there, the surface of the baffle plate can be kept relatively clean and unobstructed, thus significantly reducing filtration resistance, ensuring smooth water flow, and ultimately improving overall filtration efficiency.

[0024] 3. During the filtration of filter sand, the openings on the sand baffle plate are blocked to reduce the amount of liquid required for cleaning, thereby reducing the amount of liquid used and the generation of wastewater, alleviating the pressure on subsequent wastewater treatment, and ensuring the cleanliness of the sand layer.

[0025] 4. After a period of use, the sand layer will gradually agglomerate into relatively compact clumps due to the trapped impurities and particles. While this agglomeration can adsorb impurities to some extent, it also significantly increases the resistance of water flow through the sand layer, leading to a slower filtration speed and reduced efficiency. Breaking up the sand clumps can effectively reduce the overall compaction of the sand layer, thereby significantly reducing the resistance encountered by water flow through it. The filtration speed increases, the time required to process the same volume of water is shortened, and the filtration efficiency also improves. Breaking up the sand clumps helps restore and improve the internal pore structure of the sand layer, making the pore distribution more uniform and unobstructed. This not only effectively prevents the sand layer from prematurely losing its filtration capacity due to localized blockage, but also significantly extends the stable operating cycle of the entire filtration system. Because the permeability of the sand layer is improved, the system is less likely to saturate quickly, thus greatly reducing the number of backwashing operations required. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a chemical wastewater impurity filtration device according to this embodiment;

[0027] Figure 2 This is a schematic diagram of the internal structure of the filter tower in this embodiment;

[0028] Figure 3 This is a schematic diagram of the liquid inlet pipe and water distribution pipe in this embodiment;

[0029] Figure 4 This is a schematic diagram of the structure of the first and second sleeves in this embodiment;

[0030] Figure 5 This is an explosion diagram of the first and second sleeves in this embodiment;

[0031] Figure 6 This is an example. Figure 2 A magnified view of a portion of region A in the middle;

[0032] Figure 7 This is an example. Figure 3 A magnified view of a portion of region B in the middle.

[0033] Explanation of reference numerals in the attached drawings: 1. Filter tower; 11. Discharge port; 12. Water outlet; 2. Liquid inlet mechanism; 21. Liquid inlet pipe; 22. Driven pipe; 23. Water distribution pipe; 24. Water distribution hole; 3. Sand baffle plate; 31. Baffle plate; 32. Connecting sleeve; 33. Liquid inlet; 34. First sleeve; 35. Second sleeve; 36. Water injection port; 37. First pressure relief hole; 38. Second pressure relief hole; 39. Extension rod; 4. Strip scraper; 5. Sealing sleeve; 51. Sealing baffle; 52. Baffle block; 53. Liquid outlet; 54. Return spring; 6. Limiting block; 7. Push spring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-7 The technical solutions of the embodiments of this application are clearly and completely described herein. All other embodiments obtained by those skilled in the art based on the described embodiments are within the scope of protection of this application.

[0035] like Figure 1 and Figure 2As shown, this embodiment provides a chemical wastewater impurity filtration device including a filter tower 1, a liquid inlet mechanism 2, a flushing mechanism, and a barrier mechanism. The filter tower 1 has a discharge port 11 on its side wall, located at the middle of the filter tower 1. The filter tower 1 has a water outlet 12 at its bottom for discharging filtered wastewater. The liquid inlet mechanism is located at the upper end of the filter tower 1, used to discharge unfiltered wastewater into the filter tower 1. The flushing mechanism is located at the middle of the filter tower 1, and its height is lower than the discharge port 11. By introducing wastewater into the liquid inlet mechanism 2, and distributing the water through the liquid inlet mechanism 2, the wastewater enters the flushing mechanism relatively evenly, where it undergoes preliminary filtration. After preliminary filtration, the wastewater is discharged through the water outlet 12. After a period of filtration, the barrier mechanism blocks the descent of the liquid, allowing the flushing mechanism to flush the filter sand layer located within the flushing mechanism.

[0036] like Figure 2 As shown, a sand-separating plate 3 is fixedly connected to the inner wall of the filter tower 1. Quartz sand filter media is filled above the sand-separating plate 3 to intercept and adsorb some impurities in the wastewater. A baffle plate 31 is slidably connected to one end of the quartz sand near the liquid inlet mechanism 2. The baffle plate 31 is set as a mesh, and both the sand-separating plate 3 and the baffle plate 31 can block the quartz sand filter media, reducing the occurrence of quartz sand filter media adhering to the inner wall of the filter tower 1.

[0037] like Figure 2 As shown, the liquid inlet mechanism 2 includes an inlet pipe 21, a driven pipe 22, and a water distribution pipe 23. The inlet pipe 21 is fixedly connected to the upper end of the filter tower 1 and is connected to an external pump. Wastewater that has not undergone preliminary filtration is introduced into the inlet pipe 21 through the external pump. The driven pipe 22 is slidably sleeved in the inlet pipe 21 and is connected to the inside of the inlet pipe 21. The water distribution pipe 23 is fixedly connected to the driven pipe 22 and is axially distributed on the side wall of the driven pipe 22. The water distribution pipe 23 is connected to the driven pipe 22. A water distribution hole 24 is opened on the side wall of the water distribution pipe 23 and is located along the radial length of the water distribution pipe 23. Unfiltered wastewater is introduced into the inlet pipe 21 by an external pump. The wastewater enters the driven pipe 22 through the inlet pipe 21 and then enters the distribution pipe 23 through the driven pipe 22. After entering the distribution pipe 23, the impact force of the liquid drives the distribution pipe 23 and the driven pipe 22 to rotate, so that the liquid in the distribution pipe 23 can be evenly distributed on the baffle plate 31.

[0038] The entire liquid inlet and distribution process begins with the startup of the external pump. The pump forces unfiltered wastewater into the inlet pipe 21 fixed at the top of the filter tower 1. The wastewater then flows into the driven pipe 22, which is slidably fitted inside the inlet pipe 21. Next, the wastewater enters the distribution pipe 23 fixed to the driven pipe 22. When the wastewater sprays out from the distribution holes 24 on the side wall of the distribution pipe 23, the resulting liquid impact force acts on the distribution pipe 23 and the driven pipe 22, driving them to begin rotating. This rotation causes the distribution holes 24 to continuously change direction, thereby evenly distributing the wastewater onto the baffle plate 31 below.

[0039] Among them, such as Figure 2 As shown, a strip scraper 4 is fixedly connected below the water distribution pipe 23. The strip scraper 4 is used to push the solid impurities remaining on the barrier plate 31 away from the center of the barrier plate 31 when the water distribution pipe 23 rotates, thereby reducing the occurrence of reduced filtration efficiency of the barrier plate 31 due to the accumulation of solid impurities.

[0040] During operation, the water distribution pipe 23 begins to rotate due to the reaction force generated by the internal liquid jet, and the strip scraper 4 fixed below it also rotates synchronously. The rotating scraper is in close contact with the upper surface of the baffle plate 31, continuously pushing the solid impurities accumulated on the surface of the baffle plate 31 forward and guiding them away from the center. Through this mechanical scraping and directional conveying method, the formation of thick layers of impurities in the key filtration area is effectively prevented, thereby keeping the baffle plate 31 unobstructed, avoiding the problems of increased filtration resistance and decreased efficiency, and ensuring the continuous high efficiency of the filtration process.

[0041] At the same time, such as Figure 2 As shown, a limiting block 6 is fixedly connected to the side wall of the filter tower 1, and the height of the limiting block 6 is set lower than the discharge port 11. The limiting block 6 is used to limit the highest position of the baffle plate 31.

[0042] like Figure 2 , Figure 4 and Figure 5As shown, the flushing mechanism includes a connecting sleeve 32, a first sleeve 34, an extension rod 39, and a second sleeve 35. The connecting sleeve 32 is fixedly connected to one end of the sand-separating plate 3 near the water outlet 12. An inlet 33 is provided at the bottom of the filter tower 1, and the connecting sleeve 32 is fitted into the inlet 33. A water injection port 36 is provided on the connecting sleeve 32, which can communicate with the inlet 33. The first sleeve 34 is slidably connected inside the connecting sleeve 32, and the upper end of the first sleeve 34... The first sleeve 34 is fixedly connected to the barrier plate 31. A first pressure relief hole 37 is provided on the first sleeve 34. An extension rod 39 is fixedly connected to the outer wall of the first sleeve 34 and is positioned above the sand-separating plate 3. The extension rod 39 is rhomboid in shape and is used to break up the filter sand that has agglomerated into clumps after multiple filtrations. A second sleeve 35 is slidably connected inside the first sleeve 34. A second pressure relief hole 38 is provided on the second sleeve 35. The second pressure relief hole 38 and the first pressure relief hole 37 are staggered. Liquid is introduced into the water inlet 36, allowing it to enter the liquid inlet 33 and be stored there. After a certain amount of liquid is stored in the liquid inlet 33, the liquid pressure pushes the first sleeve 34 and the second sleeve 35 upward. Due to the extension rod 39, the resistance force of the first sleeve 34 when it moves upward is greater than that of the second sleeve 35. At this time, the upward movement of the second sleeve 35 is greater than that of the first sleeve 34, so that the second pressure relief hole 38 located at the lower position on the second sleeve 35 is connected to the first pressure relief hole 37 located at the lower position on the head of the first sleeve 34. This allows the liquid to impact out from the lower position of the sand-separating plate 3, and the filter sand located on the sand-separating plate 3 is washed and dispersed by the impact force of the liquid. At the same time, due to the pressure, the first sleeve 34 continues to move upward, and the extension rod 39 breaks up the clumps of filter sand.

[0043] like Figure 3 , Figure 6 and Figure 7 As shown, the barrier mechanism includes a sealing sleeve 5, a sealing baffle 51, a barrier block 52, and a return spring 54. The sealing sleeve 5 is slidably connected to the bottom of the filter tower 1 and is fitted in the middle of the liquid inlet 33 of the connecting sleeve 32. The sealing baffle 51 is slidably connected to the filter tower 1 and is fixedly connected to the sealing sleeve 5. The barrier block 52 is fixedly connected to the sealing baffle 51, and multiple barrier blocks 52 are provided. The sand separating plate 3 has a liquid outlet 53, and multiple liquid outlets 53 are provided. Multiple liquid outlets 53 and multiple barrier blocks 52 are correspondingly provided.

[0044] When the sealing baffle 51 moves upward, the blocking block 52 can block the outlet 53. The return spring 54 is fixedly connected to the sealing sleeve 5, and the end of the return spring 54 away from the sealing sleeve 5 is fixedly connected to the connecting sleeve 32. The return spring 54 is used to push the sealing sleeve 5 to move downward. When the sealing sleeve 5 moves downward, the sealing sleeve 5 will cut off the communication between the inlet 33 and the water inlet 36. When water is injected into the inlet 33, the pressure of the liquid pushes the sealing sleeve to move upward, so that the moving sealing sleeve moves to the point where the inlet 33 and the water inlet 36 can communicate. When it moves to this height, the sealing baffle 51 moves to the position below the sand-separating plate 3 under the push of the sealing sleeve, so that the blocking block 52 on the sealing baffle 51 blocks the outlet 53. The liquid moves through the water inlet 36 to the position above the sand-separating plate 3, so that the liquid impacts the filter sand.

[0045] like Figure 7 As shown, a push spring 7 is fixedly connected to one end of the second sleeve 35 near the baffle plate 31, and the other end of the push spring 7 away from the second sleeve 35 is fixedly connected to the first sleeve 34. The push spring 7 is used to push the second sleeve 35 to move downward.

[0046] like Figure 5 As shown, the first pressure relief hole 37 is axially arranged on the first sleeve 34, and the diameter of the first pressure relief hole 37 gradually decreases in the direction close to the baffle plate 31. The second pressure relief hole 38 is axially arranged on the second sleeve 35, and the diameter of the second pressure relief hole 38 gradually decreases in the direction close to the baffle plate 31.

[0047] In this application, wastewater that requires preliminary impurity separation is first introduced into the inlet pipe 21. The wastewater then enters the driven pipe 22 through the inlet pipe 21 and then enters the distribution pipe 23 through the driven pipe 22. The wastewater then enters the baffle plate 31 through the distribution holes 24 on the distribution pipe 23. After being filtered by the baffle plate 31, the solid impurities in the wastewater are blocked by the baffle plate 31. Under the action of flushing water, the distribution pipe 23 is pushed to rotate. During the rotation, the strip scraper 4 cleans the impurities remaining on the baffle plate 31.

[0048] After the first filtration, the wastewater enters the area below the baffle plate 31 and above the sand separator 3, and moves downwards under the filtration of the sand. This allows the impurities in the wastewater to be intercepted and adsorbed by the sand, and then move to the lower outlet 12 of the filter tower 1 through the liquid outlet 53 on the sand separator 3, thus completing the initial filtration of the wastewater.

[0049] After multiple filtrations, the filter sand contains a large amount of impurities and clumps together. Backflushing occurs through the inlet 33 into the reaction tower, gradually increasing the liquid pressure and pushing the sealing sleeve upwards. This upward movement of the sealing sleeve allows the inlet 33 and the water inlet 36 to communicate. When it reaches this height, the sealing baffle 51 moves to a position below the sand-separating plate 3 under the push of the sealing sleeve, causing the blocking block 52 on the sealing baffle 51 to block the outlet 53. The liquid then moves through the water inlet 36 to a position above the sand-separating plate 3, impacting the filter sand.

[0050] After a certain amount of liquid is stored in the inlet 33, the liquid pressure pushes the first sleeve 34 and the second sleeve 35 upwards. Due to the extension rod 39, the resistance force of the first sleeve 34 during upward movement is greater than that of the second sleeve 35. At this time, the upward movement of the second sleeve 35 is greater than that of the first sleeve 34, causing the second pressure relief hole 38 located at the lower position on the second sleeve 35 to connect with the first pressure relief hole 37 located at the lower position on the head of the first sleeve 34. This allows the liquid to first impact out from the lower position of the sand-separating plate 3, washing and breaking up the filter sand located on the sand-separating plate 3 under the impact force of the liquid. At the same time, due to the pressure, the first sleeve 34 continues to move upwards, and the extension rod 39 breaks up the clumps of filter sand. This completes the backflushing and cleaning of the filter sand.

[0051] In this embodiment, by rinsing and breaking up the filter sand on the baffle plate 3, the fine particle state of the filter sand can be effectively restored, increasing its specific surface area and porosity, thereby directly improving filtration efficiency. Simultaneously, breaking up clumped filter sand can remove blockages, restore the permeability of the sand layer, effectively prevent premature clogging of the filter sand layer, and thus extend the stable operating cycle of the filtration system, reduce the frequency of backwashing, and save valuable water and energy resources. Furthermore, maintaining the uniformity of the filter sand layer also improves the operational stability of the system and reduces the additional pressure and maintenance costs caused by filter sand clumping, enabling the entire filtration system to operate more efficiently, economically, and stably for a longer period.

[0052] In this embodiment, the impurities on the filter sand are removed by the liquid impact, improving the purity of the filter sand. During the impact process, the clumps in the filter sand are broken up, and the sand is dispersed evenly, which helps to improve the flowability of the filter sand. Furthermore, the filter sand can be rearranged, increasing the contact area between the filter sand and the wastewater during the subsequent preliminary filtration of wastewater, thereby increasing the filtration efficiency.

[0053] In this embodiment, a large amount of liquid needs to be injected for rinsing in order to effectively clean the sand particles accumulated on the sand baffle plate 3. This not only means high water consumption, but also leads to the generation of a large amount of wastewater containing sand particles. By blocking the openings on the sand baffle plate 3 during the filtration process, the amount of liquid required for cleaning is reduced, the amount of liquid used is decreased, and the generation of wastewater is reduced, alleviating the pressure on subsequent wastewater treatment while ensuring the cleanliness of the sand layer.

[0054] In this embodiment, by setting the strip scraper 4, the solid impurities remaining on the barrier plate 31 can be moved away from the center of the barrier plate 31, preventing the solid impurities from forming too thick, thereby reducing the filtration resistance and improving the filtration efficiency.

[0055] In this embodiment, after the filter sand is cleaned, the baffle plate 31 moves down along with the first sleeve 34, so that the baffle plate 31 presses down on the rinsed filter sand, reducing the uneven distribution of filter sand in the center due to liquid impact, and enhancing the filtration effect of the filter sand.

[0056] In this embodiment, due to the size of the diameter of the first pressure relief hole 37 and the second pressure relief hole 38, when the amount of liquid entering the first sleeve 34 and the second sleeve 35 decreases, the first pressure relief hole 37 and the second pressure relief hole 38 located above close, reducing the probability that the filter sand flows directly into the first sleeve 34 and the second sleeve 35.

[0057] The implementation principle of a chemical wastewater impurity filtration device in this application embodiment is as follows: First, the wastewater that needs to be initially separated into impurities is introduced into the inlet pipe 21. The wastewater enters the driven pipe 22 through the inlet pipe 21 and then enters the water distribution pipe 23 through the driven pipe 22. The water is then introduced into the baffle plate 31 through the water distribution hole 24 on the water distribution pipe 23. After being filtered by the baffle plate 31, the solid impurities in the wastewater are blocked by the baffle plate 31. Under the action of flushing water, the water distribution pipe 23 is pushed to rotate. During the rotation, the strip scraper 4 cleans the impurities remaining on the baffle plate 31.

[0058] After the first filtration, the wastewater enters the area below the baffle plate 31 and above the sand separator 3, and moves downwards under the filtration of the sand. This allows the impurities in the wastewater to be intercepted and adsorbed by the sand, and then move to the lower outlet 12 of the filter tower 1 through the liquid outlet 53 on the sand separator 3, thus completing the initial filtration of the wastewater.

[0059] After multiple filtrations, the filter sand contains a large amount of impurities and clumps together. Backflushing occurs through the inlet 33 into the reaction tower, gradually increasing the liquid pressure and pushing the sealing sleeve upwards. This upward movement of the sealing sleeve allows the inlet 33 and the water inlet 36 to communicate. When it reaches this height, the sealing baffle 51 moves to a position below the sand-separating plate 3 under the push of the sealing sleeve, causing the blocking block 52 on the sealing baffle 51 to block the outlet 53. The liquid then moves through the water inlet 36 to a position above the sand-separating plate 3, impacting the filter sand.

[0060] After a certain amount of liquid is stored in the inlet 33, the liquid pressure pushes the first sleeve 34 and the second sleeve 35 upwards. Due to the extension rod 39, the resistance force of the first sleeve 34 during upward movement is greater than that of the second sleeve 35. At this time, the upward movement of the second sleeve 35 is greater than that of the first sleeve 34, causing the second pressure relief hole 38 located at the lower position on the second sleeve 35 to connect with the first pressure relief hole 37 located at the lower position on the head of the first sleeve 34. This allows the liquid to first impact out from the lower position of the sand-separating plate 3, washing and breaking up the filter sand located on the sand-separating plate 3 under the impact force of the liquid. At the same time, due to the pressure, the first sleeve 34 continues to move upwards, and the extension rod 39 breaks up the clumps of filter sand. This completes the backflushing and cleaning of the filter sand.

[0061] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A chemical wastewater impurity filtration device, comprising a filter tower (1), a liquid inlet mechanism (2) disposed above the filter tower (1), a discharge port (11) opened on the side wall of the filter tower (1), and a water outlet (12) opened at the bottom of the filter tower (1), characterized in that: A sand-separating plate (3) is fixedly connected to the inner wall of the filter tower (1). A baffle plate (31) is slidably connected to one end of the sand-separating plate (3) near the top of the filter tower (1). A connecting sleeve (32) is fixedly connected to the center of the sand-separating plate (3). An inlet (33) is opened at the bottom of the filter tower (1). The connecting sleeve (32) is fitted into the inlet (33). A first sleeve (34) is slidably connected to the connecting sleeve (32). The first sleeve (34) and the baffle plate (31) are connected to the connecting sleeve (32). The partition (31) is fixedly connected, and an extension rod (39) for breaking up the condensed filter sand layer is fixedly connected to the outer wall of the first sleeve (34). A second sleeve (35) is slidably connected in the first sleeve (34). A water inlet (36) communicating with the inside of the connecting sleeve (32) is opened on the connecting sleeve (32). A first pressure relief hole (37) is opened on the side wall of the first sleeve (34), and a second pressure relief hole (38) is opened on the second sleeve (35).

2. The chemical wastewater impurity filtration equipment according to claim 1, characterized in that: The liquid inlet mechanism (2) includes a liquid inlet pipe (21) fixedly connected above the filter tower (1). A driven pipe (22) is slidably sleeved in the liquid inlet pipe (21). A water distribution pipe (23) is fixedly connected to the axial side wall of the driven pipe (22). A water distribution hole (24) is opened on the side wall of the water distribution pipe (23). The water distribution pipe (23) and the driven pipe (22) are connected. The driven pipe (22) and the liquid inlet pipe (21) are connected.

3. The chemical wastewater impurity filtration equipment according to claim 2, characterized in that: A strip scraper (4) is fixedly connected to the lower part of the water distribution pipe (23). The strip scraper (4) is used to scrape off the solid impurities remaining on the barrier plate (31).

4. The chemical wastewater impurity filtration equipment according to claim 1, characterized in that: A sealing sleeve (5) is slidably connected to the inlet (33) of the filter tower (1). The inner side wall of the sealing sleeve (5) abuts against the outer side wall of the connecting sleeve (32). The outer side wall of the sealing sleeve (5) abuts against the side wall of the inlet (33) of the filter tower (1). A sealing baffle (51) is fixedly connected to the sealing sleeve (5). A blocking block (52) is provided on the sealing baffle (51). An outlet (53) is provided on the sand separator (3). The blocking block (52) is provided corresponding to the outlet (53).

5. The chemical wastewater impurity filtration equipment according to claim 4, characterized in that: A return spring (54) is fixedly connected to the sealing sleeve (5). The end of the return spring (54) away from the sealing sleeve (5) is fixedly connected to the connecting sleeve (32). The return spring (54) is used to push the sealing sleeve (5) to move down and disconnect the connection between the liquid inlet (33) and the connecting sleeve (32).

6. The chemical wastewater impurity filtration equipment according to claim 1, characterized in that: A limiting block (6) is fixedly connected to the side wall of the filter tower (1). The limiting block (6) is used to limit the upward movement height of the barrier plate (31) when it moves upward.

7. The chemical wastewater impurity filtration device according to claim 1, characterized in that: A push spring (7) is fixedly connected to one end of the second sleeve (35) near the barrier plate (31). The end of the push spring (7) away from the second sleeve (35) is fixedly connected to the first sleeve (34). The push spring (7) is used to push the second sleeve (35) to move downward.

8. The chemical wastewater impurity filtration equipment according to claim 1, characterized in that: The first pressure relief holes (37) are axially arrayed on the first sleeve (34), and the diameter of the first pressure relief holes (37) decreases sequentially from bottom to top in the direction close to the baffle plate (31).

9. A chemical wastewater impurity filtration device according to claim 1, characterized in that: The second pressure relief holes (38) are axially arrayed on the second sleeve (35), and the diameter of the second pressure relief holes (38) decreases sequentially from bottom to top in the direction close to the baffle plate (31).

10. A chemical wastewater impurity filtration device according to claim 1, characterized in that: The extension rod (39) is configured as a rhombus.

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