Filtering device for circulating water purification

Abstract

The utility model belongs to the technical field of water purification equipment, and particularly relates to a filtering device for circulating water purification, which comprises a primary sedimentation tank, a secondary sedimentation tank and a water purification tank, the primary sedimentation tank is connected with the secondary sedimentation tank through a first connecting pipe, and a first valve, a first water pump and a first filter are arranged on the first connecting pipe; the first filter is used for filtering oil stains and large-particle impurities in water; the secondary sedimentation tank is connected with the water purification tank through a second connecting pipe, a second valve, a second water pump and a second filter are arranged on the second connecting pipe, and the second filter is used for filtering small-particle impurities and colloids in water; the water purifying tank is connected with a water return pipe which is provided with a water return valve and a water return pump. According to the device, the use of chemical agents can be reduced, heavy metals, small-particle impurities, suspended solids, colloids and other pollutants in wastewater are filtered out through two-time precipitation and two-time filtration, and the damage of the chemical agents to part of equipment can be reduced while the environment is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification equipment, and specifically relates to a filtering device for circulating water purification. Background Art

[0002] The steel production process consumes a lot of water resources, and also produces a lot of wastewater and waste residue, which has a serious impact on the environment. The amount of wastewater produced by each ton of steel is about 10 cubic meters, which contains a lot of suspended matter, grease, heavy metals and other pollutants. If not treated, these wastewaters will cause irreversible damage to water sources, soil, vegetation, ecosystems, etc.

[0003] At present, after using circulating cooling water, steel enterprises will recycle and reuse circulating water to reduce the replenishment of new water and the discharge of wastewater, thereby saving water resources and protecting the environment. The circulating cooling water system in the hot rolling area mainly includes cooling water for hot rolling units, rough rolling units, finishing rolling units, pre-finishing rolling units, flying shear units and other equipment. The system adopts two methods: open clean circulating cooling water system and open turbid circulating cooling water system. The clean circulating cooling water system mainly supplies cooling water for hot rolling units, rough rolling units, finishing rolling units and other equipment. The used hot water flows into the hot water pool, is pressurized by the pump and sent to the cooling tower for cooling, and then flows into the cold water pool, which is pressurized by the pump and sent to the equipment for use. The turbid circulating cooling water system mainly supplies water for spraying and flushing of equipment such as pre-finishing rolling units and flying shear units. The used turbid water flows into the sedimentation tank for sedimentation treatment, and then is pressurized by the pump to the equipment for use. However, when the system purifies the circulating water, chemical agents are often added for chemical treatment. These chemicals often remain in the subsequent purified water and cause a certain degree of damage to some equipment. In addition, the filter used for slag removal will also accumulate a large amount of dirt and clog the mesh, resulting in reduced filtration efficiency and affecting the purification effect.

[0004] Therefore, improvements are urgently needed. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the utility model provides a filtering device for circulating water purification, comprising a primary sedimentation tank, a secondary sedimentation tank and a clean water tank, one side of the primary sedimentation tank is connected to a water inlet pipe, the other side of the primary sedimentation tank is connected to one side of the secondary sedimentation tank through a first connecting pipe, the first connecting pipe is provided with a first valve, a first water pump and a first filter, the first filter comprises a first shell, the top of the first shell is sealed with a first top cover, the side of the first shell is connected with a first filter inlet and a first filter outlet, the interior of the first shell is provided with a first grid, a second grid in sequence along the water flow direction The first grille is composed of a plurality of vertical bars which are spaced apart and arranged in parallel, and the bottom ends of the plurality of vertical bars are fixed to the bottom of the first shell; the second grille is composed of a plurality of horizontal bars which are spaced apart and arranged in parallel, and the two ends of the plurality of horizontal bars are respectively fixed to the two side walls of the first shell; the filter screen is detachably fixedly installed in the first shell; a slide groove can be arranged on the left and right inner walls of the first shell; slide frames which cooperate with the slide groove are arranged on the left and right sides of the filter screen, so that the filter screen can be conveniently removed and replaced; the filter screen is provided with a cleaning component for cleaning the mesh; and a sewage outlet is provided at the bottom of the first shell.

[0006] The other side of the secondary sedimentation tank is connected to one side of the clean water tank through a second connecting pipe, and a second valve, a second water pump and a second filter are arranged on the second connecting pipe. The second filter includes a second shell, and a second top cover is sealed on the top of the second shell. The side of the second shell is connected with a second filter inlet and a second filter outlet, and a primary filter element, a secondary filter element and a tertiary filter element are arranged in sequence inside the second shell along the water flow direction.

[0007] The other side of the clean water tank is connected to a return pipe, on which a return valve and a return pump are arranged.

[0008] Optionally, the cleaning assembly is located between the second grille and the filter screen, and the cleaning assembly includes a cleaning rod, a threaded rod and two guide rods. The cleaning rod is horizontally arranged in the first shell, and a brush is arranged on the side of the cleaning rod close to the filter screen, and the bristles of the brush are against the surface of the filter screen. The bottom end of the threaded rod passes through the first top cover and is rotatably connected to the middle part of the cleaning rod, and the threaded rod and the first top cover are threaded and sealed. A handle is provided at the top of the threaded rod, and two guide rods are arranged on the left and right sides of the threaded rod. The bottom ends of the two guide rods pass through the first top cover and are fixedly connected to the cleaning rod, and the guide rod and the first top cover are slidably and sealed.

[0009] Optionally, each vertical bar of the first grille and each horizontal bar of the second grille are covered with oil-absorbing felt on the outside.

[0010] Specifically, the first grid and the second grid can be used for preliminary filtration, and can filter out large particles of impurities in the wastewater, while the oil-absorbing felt can absorb oil in the water.

[0011] Optionally, a plugging cap is provided at the sewage outlet.

[0012] Optionally, the first-stage filter element adopts an activated carbon filter layer, the second-stage filter element adopts a microfiltration membrane, and the third-stage filter element adopts an ultrafiltration membrane.

[0013] Specifically, the activated carbon filter layer mainly plays the role of adsorbing impurities and heavy metals in the wastewater, the microfiltration membrane mainly plays the role of filtering out suspended matter, bacteria, high molecular weight colloids and other substances in the wastewater, and the ultrafiltration membrane mainly plays the role of filtering out high molecular weight colloids and suspended particles.

[0014] Optionally, a booster pump is also provided on the second connecting pipe.

[0015] Specifically, a booster pump is used to provide pressure to the ultrafiltration membrane.

[0016] The utility model also includes other components that enable a circulating water purification filter device to be used normally, which are all conventional technical means in the art. In addition, the devices or components not limited in the utility model all adopt conventional technical means in the art, such as water pumps, booster pumps and return water pumps.

[0017] The working principle of the utility model is that the wastewater first enters the primary sedimentation tank through the water inlet pipe, and after sedimentation, the wastewater enters the secondary sedimentation tank after being filtered by the first filter. The first filter can filter out large particle impurities and oil pollution in the wastewater. After sedimentation in the secondary sedimentation tank, the wastewater enters the clean water tank after being filtered by the second filter. The second filter can filter out heavy metals, small particle impurities, suspended matter, colloids, etc. in the wastewater. After two sedimentations and two filtrations, the wastewater becomes clean water and is stored in the clean water tank, and is pumped to the equipment for use through the return pipe. After a period of use, a large amount of impurities and dirt will accumulate on the filter net of the first filter. At this time, the threaded rod can be manually twisted to move the cleaning rod downward, thereby driving the brush to sweep the surface of the filter net, and then the threaded rod is twisted in the opposite direction to lift the cleaning rod, and then lower the cleaning rod. Repeat the operation until the impurities and dirt retained on the surface of the filter net are swept down to avoid clogging of the mesh, and finally the plug cap is opened to discharge the dirt.

[0018] The beneficial effect of the utility model is that it can reduce the use of chemical agents, and through two precipitations and two filtrations, pollutants such as heavy metals, small particle impurities, suspended matter, colloids, etc. in the wastewater can be filtered out, while protecting the environment, it can also reduce the damage of chemical agents to some equipment; in addition, the cleaning component can sweep the filter mesh in the first filter to avoid mesh clogging, improve the filtration efficiency, and ensure the purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the internal structure of the first filter of the utility model.

[0022] Figure 3 It is a schematic diagram of the positional relationship between the first grille and the second grille of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the cleaning component of the utility model.

[0024] Figure 5 It is a schematic diagram of the internal structure of the second filter of the utility model.

[0025] In the figure: 1. primary sedimentation tank, 2. secondary sedimentation tank, 3. clean water tank, 4. water inlet pipe, 5. first connecting pipe, 6. first valve, 7. first water pump, 8. first filter, 9. first shell, 10. first top cover, 11. first filter inlet, 12. first filter outlet, 13. first grille, 14. second grille, 15. filter screen, 16. cleaning assembly, 17. cleaning rod, 18. threaded rod, 19. guide rod, 20. sewage outlet, 21. plugging cap, 22. second connecting pipe, 23. second valve, 24. second water pump, 25. second filter, 26. second shell, 27. second top cover, 28. second filter inlet, 29. second filter outlet, 30. primary filter element, 31. secondary filter element, 32. tertiary filter element, 33. return pipe, 34. return valve, 35. return pump, 36. booster pump. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0027] Example

[0028] like Figure 1-5As shown, the embodiment of the utility model provides a filtering device for circulating water purification, including a primary sedimentation tank 1, a secondary sedimentation tank 2 and a clean water tank 3, one side of the primary sedimentation tank 1 is connected to a water inlet pipe 4, the other side of the primary sedimentation tank 1 is connected to one side of the secondary sedimentation tank 2 through a first connecting pipe 5, the first connecting pipe 5 is provided with a first valve 6, a first water pump 7 and a first filter 8, the first filter 8 includes a first shell 9, the top of the first shell 9 is sealed with a first top cover 10, the side of the first shell 9 is connected with a first filter inlet 11 and a first filter outlet 12, the interior of the first shell 9 is sequentially provided with a first grid 13, a second grid 14 and a filter screen 15 along the water flow direction, the first grid 13 is composed of a plurality of vertical bars arranged in parallel at intervals, and the bottom ends of the plurality of vertical bars are fixed to the bottom of the first shell 9, the second grid 14 is composed of a plurality of horizontal bars arranged in parallel at intervals, and the two ends of the plurality of horizontal bars are respectively fixed to the two side walls of the first shell 9; the filter screen 15 is detachably fixedly installed in the first shell 9, and can be on the left and right sides of the first shell 9 A slide groove is arranged on the inner wall, and slide frames matching the slide groove are arranged on the left and right sides of the filter screen 15, so that the filter screen 15 can be easily removed and replaced. The filter screen 15 is provided with a cleaning component 16 for cleaning the mesh. The cleaning component 16 is located between the second grille 14 and the filter screen 15. The cleaning component 16 includes a cleaning rod 17, a threaded rod 18 and two guide rods 19. The cleaning rod 17 is transversely arranged in the first housing 9. A brush is arranged on one side of the cleaning rod 17 close to the filter screen 15, and the bristles of the brush are against the surface of the filter screen 15. On the top, the bottom end of the threaded rod 18 passes through the first top cover 10 and is rotatably connected to the middle part of the cleaning rod 17, and the threaded rod 18 and the first top cover 10 are threaded and sealed. A handle is provided at the top of the threaded rod 18, and two guide rods 19 are respectively arranged on the left and right sides of the threaded rod 18. The bottom ends of the two guide rods 19 both pass through the first top cover 10 and are fixedly connected to the cleaning rod 17, and the guide rod 19 and the first top cover 10 are slidably and sealed. A sewage outlet 20 is provided at the bottom of the first shell 9, and a plugging cap 21 is provided at the sewage outlet 20.

[0029] The other side of the secondary sedimentation tank 2 is connected to one side of the clean water tank 3 through a second connecting pipe 22, and a second valve 23, a second water pump 24 and a second filter 25 are arranged on the second connecting pipe 22. The second filter 25 includes a second shell 26, and the top of the second shell 26 is sealed with a second top cover 27. The side of the second shell 26 is connected with a second filter inlet 28 and a second filter outlet 29. The interior of the second shell 26 is provided with a primary filter element 30, a secondary filter element 31 and a tertiary filter element 32 in sequence along the water flow direction.

[0030] The other side of the clean water tank 3 is connected to a return pipe 33 , on which a return valve 34 and a return pump 35 are provided.

[0031] In addition, each vertical bar of the first grid 13 and each horizontal bar of the second grid 14 are covered with oil-absorbing felt on the outside. The first grid 13 and the second grid 14 can be used for preliminary filtration, and can filter out large particles of impurities in the wastewater. At the same time, the oil-absorbing felt can absorb oil in the water. The first filter element 30 adopts an activated carbon filter layer, the second filter element 31 adopts a microfiltration membrane, and the third filter element 32 adopts an ultrafiltration membrane. The activated carbon filter layer mainly plays a role in absorbing impurities and heavy metals in the wastewater, the microfiltration membrane mainly plays a role in filtering out suspended matter, bacteria and high molecular weight colloids in the wastewater, and the ultrafiltration membrane mainly plays a role in filtering out high molecular weight colloids and suspended particles. A booster pump 36 is also provided on the second connecting pipe 22, and the booster pump 36 is used to provide pressure for the ultrafiltration membrane.

[0032] The working principle of the utility model is that the wastewater first enters the primary sedimentation tank 1 through the water inlet pipe 4. After sedimentation, the wastewater enters the secondary sedimentation tank 2 after being filtered by the first filter 8. The first filter 8 can filter out large particle impurities and oil pollution in the wastewater. After sedimentation in the secondary sedimentation tank 2, the wastewater enters the clean water tank 3 after being filtered by the second filter 25. The second filter 25 can filter out heavy metals, small particle impurities, suspended matter, colloids, etc. in the wastewater. After two sedimentations and two filtrations, the wastewater becomes clean water and is stored in the clean water tank 3, and is pumped to the equipment for use through the return pipe 33. After being used for a period of time, a large amount of impurities and dirt will accumulate on the filter screen 15 of the first filter 8. At this time, the threaded rod 18 can be manually twisted to move the cleaning rod 17 downward, thereby driving the brush to sweep the surface of the filter screen 15. Then, the threaded rod 18 is twisted in the opposite direction to lift the cleaning rod 17, and then lower the cleaning rod 17. This operation is repeated until the impurities and dirt retained on the surface of the filter screen 15 are swept down to avoid clogging of the mesh. Finally, the blocking cap 21 is opened to discharge the dirt.

[0033] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A filtering device for circulating water purification, comprising a primary sedimentation tank, a secondary sedimentation tank and a water purification tank, characterized in that: One side of the primary sedimentation tank is connected with a water inlet pipe, and the other side of the primary sedimentation tank is connected to one side of the secondary sedimentation tank through a first connecting pipe, and a first valve, a first water pump and a first filter are arranged on the first connecting pipe. The first filter includes a first shell, and a first top cover is sealed on the top of the first shell. A first filter inlet and a first filter outlet are connected to the side of the first shell. A first grid, a second grid and a filter screen are sequentially arranged inside the first shell along the water flow direction. The first grid is composed of a plurality of vertical bars that are spaced apart and arranged in parallel, and the bottom ends of the plurality of vertical bars are fixed to the bottom of the first shell. The second grid is composed of a plurality of horizontal bars that are spaced apart and arranged in parallel, and the two ends of the plurality of horizontal bars are respectively fixed to the two side walls of the first shell. The filter screen is provided with a cleaning component for cleaning the mesh, and a sewage outlet is provided at the bottom of the first shell. The other side of the secondary sedimentation tank is connected to one side of the water purification tank through a second connecting pipe, and a second valve, a second water pump and a second filter are arranged on the second connecting pipe. The second filter includes a second housing, a second top cover is sealed on the top of the second housing, a second filter inlet and a second filter outlet are connected to the side of the second housing, and a primary filter element, a secondary filter element and a tertiary filter element are arranged in sequence inside the second housing along the water flow direction; The other side of the clean water tank is connected to a return pipe, on which a return valve and a return pump are arranged.

2. The circulating water purification filter device according to claim 1, characterized in that: The cleaning assembly is located between the second grille and the filter screen, and the cleaning assembly includes a cleaning rod, a threaded rod and two guide rods. The cleaning rod is horizontally arranged in the first shell, and a brush is arranged on the side of the cleaning rod close to the filter screen, and the bristles of the brush are against the surface of the filter screen. The bottom end of the threaded rod passes through the first top cover and is rotatably connected to the middle part of the cleaning rod, and the threaded rod and the first top cover are threaded and sealed. A handle is provided at the top end of the threaded rod, and two guide rods are arranged on the left and right sides of the threaded rod. The bottom ends of the two guide rods pass through the first top cover and are fixedly connected to the cleaning rod, and the guide rod and the first top cover are slidably and sealed.

3. The circulating water purification filter device according to claim 2, characterized in that: The exterior of each vertical bar of the first grid and each horizontal bar of the second grid is covered with oil-absorbing felt.

4. The circulating water purification filter device according to claim 3, characterized in that: A plugging cap is provided at the sewage outlet.

5. The circulating water purification filtering device according to claim 4, characterized in that: The first-stage filter element uses an activated carbon filter layer, the second-stage filter element uses a microfiltration membrane, and the third-stage filter element uses an ultrafiltration membrane.

6. The circulating water purification filtering device according to claim 5, characterized in that: A booster pump is also provided on the second connecting pipe.

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