CN112960784B - Composite filter element, preparation method thereof and water purifier with composite filter element - Google Patents
Composite filter element, preparation method thereof and water purifier with composite filter element Download PDFInfo
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- CN112960784B CN112960784B CN202110159521.1A CN202110159521A CN112960784B CN 112960784 B CN112960784 B CN 112960784B CN 202110159521 A CN202110159521 A CN 202110159521A CN 112960784 B CN112960784 B CN 112960784B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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Abstract
The application relates to the technical field of water purification, and particularly discloses a composite filter element which comprises a PP cotton layer, an activated carbon fiber cylinder, an ultrafiltration membrane shell and an ultrafiltration membrane from outside to inside. The activated carbon fiber replaces the traditional activated carbon particles, so that the activated carbon fiber can be combined with the ultrafiltration membrane to form a CMF membrane structure, thereby not only further reducing the volume of the filter element, but also ensuring the water purification efficiency of the filter element; the preparation method comprises the following steps: carbonizing and activating carbon fiber with molten strong alkali, washing and neutralizing the carbon fiber with acid and distilled water, molding and drying the activated carbon fiber, and installing the ultrafiltration membrane. The whole production process is simpler and is suitable for industrial production. In addition, the composite filter element is used for the water purifier, so that the overall water purification efficiency of the water purifier can be effectively improved.
Description
Technical Field
The application relates to the technical field of water purification, in particular to a composite filter element, a preparation method thereof and a water purifier with the composite filter element.
Background
The water purifier is also called a water purifier and a water quality purifier, and is water treatment equipment for carrying out deep filtration and purification treatment on water according to the use requirement of water. The water purifier generally refers to a small-sized purifier used in home.
In addition, the traditional water purifier mainly adopts a five-stage filtration technology, wherein the first stage is a filter element, also called PP cotton filter element (PPF), the second stage is a granular activated carbon (UDF) filter element, the third stage is a precise compressed activated Carbon (CTO) filter element, the fourth stage is a reverse osmosis membrane or an ultrafiltration membrane, and the fifth stage is post-positioned activated carbon (small T33). Because the five filter elements are independently designed, the traditional water purifier has large common volume and needs to occupy more space.
For this reason, miniaturization has become a mainstream development of water purifiers. In order to achieve miniaturization of the water purifier, enterprises generally use the combined filter element when producing the water purifier, so that the space of the water purifier is reduced.
For example, chinese patent publication No. CN105329973B discloses a composite filter element and a water purification system having the same, the composite filter element comprising: the shell is internally provided with a cavity, and the shell is provided with a water inlet and a water outlet; the activated carbon fiber cylinder is arranged in the cavity, an installation cavity is defined in the activated carbon fiber cylinder, the activated carbon fiber cylinder is provided with a water inlet channel for conducting the outer wall surface of the activated carbon fiber cylinder and the installation cavity, and the water inlet channel is communicated with the water inlet; and an ultrafiltration membrane, wherein at least one part of the ultrafiltration membrane is arranged in the mounting cavity, and a water outlet channel is arranged between the ultrafiltration membrane and the water outlet. Although the composite filter element has better function of purifying water quality, the radial thickness of the activated carbon fiber tube is larger in the actual production process because the water needs to flow a longer distance in the activated carbon fiber tube when the water is filtered. For this reason, improvements are needed.
Disclosure of Invention
In order to reduce the volume of the composite filter element on the premise of ensuring the water purifying effect of the water purifier, the application provides a composite filter element, a preparation method thereof and the water purifier with the composite filter element
The application provides a composite filter element, a preparation method thereof and a water purifier with the composite filter element, which adopts the following technical scheme:
in a first aspect, the present application provides a composite filter element, which adopts the following technical scheme:
a composite filter element mainly comprises a PP cotton layer, an active carbon fiber cylinder, an ultrafiltration membrane shell and an ultrafiltration membrane from outside to inside.
By adopting the technical proposal, the fiber diameter of the Activated Carbon Fiber (ACF) is 5-20 mu m, and the average specific surface area is 1000-2000 m 2 And/g, wherein the average pore diameter is 1.0-4.0 nm, and micropores are uniformly distributed on the surface of the fiber. Compared with granular activated carbon, the activated carbon fiber has small and uniform micropore size, simple structure, high adsorption rate for adsorbing small molecular substances (such as residual chlorine in water), high adsorption speed and easy desorption.
Therefore, the activated carbon fiber is selected to replace the activated carbon in the traditional composite filter element, and the activated carbon fiber and the ultrafiltration membrane can form a CMF membrane structure, so that on one hand, the water purification efficiency of the composite filter element can be ensured, and on the other hand, the volume of the composite filter element can be reduced.
In a second aspect, the application provides a preparation method of a composite filter element, which adopts the following technical scheme:
a preparation method of a composite filter element comprises the following steps,
step one, taking strong alkali for melting, and then adding raw material fibers into the strong alkali for mixing;
step two, heating the mixture of strong alkali and raw material fiber to 520-600 ℃ at a speed of 12 ℃/min, and preserving heat for 1-2 hours to obtain activated carbon fiber;
step three, washing the activated carbon fiber with acid and distilled water until the pH value of the washing liquid is constant at 7.0;
step four, preparing the washed activated carbon fiber into a cylinder according to requirements, and then drying at 80 ℃ to obtain an activated carbon fiber cylinder;
and fifthly, inserting the ultrafiltration membrane with the ultrafiltration membrane shell into an active carbon fiber cylinder, and assembling the active carbon fiber cylinder and the PP cotton layer together to form the finished product composite filter element.
By adopting the technical scheme, the alkali is utilized to treatThe raw material fiber is treated to remove oil stain on the surface of the active carbon fiber, and the active carbon fiber is activated by strong alkali to obtain active carbon fiber with BET specific surface area as high as 2913.4m 2 /g。
Preferably, the strong base used in step one is one of sodium hydroxide, potassium hydroxide and lithium hydroxide.
By adopting the technical scheme, sodium hydroxide, strong potassium oxide and strong lithium oxide are strong bases which are easy to obtain, so that the production cost is reduced.
Preferably, the acid used in step three is hydrochloric acid.
By adopting the technical scheme, on one hand, the hydrochloric acid has stronger acidity, and can quickly neutralize the alkalinity of strong alkali, so that the pH value of the surface of the activated carbon fiber is close to neutral. On the other hand, if hydrochloric acid is still remained on the surface of the activated carbon fiber, the hydrochloric acid volatilizes in the drying process, so that the proximity of the surface of the final activated carbon fiber cylinder is ensured.
Preferably, in the first step, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1: (5-3).
Through adopting above-mentioned technical scheme, at first the coconut husk fiber obtains conveniently, and the coconut husk fiber itself possesses more porosities, but because the coconut husk fiber easily takes place the thermal decomposition, consequently, select polypropylene fiber and coconut husk fiber to mix to the thermal stability of whole carbon fiber has been improved to a certain extent.
Preferably, in the second step, the mass ratio of the strong base to the raw material fiber is (0.8-1): 1.
by adopting the technical scheme, the mass ratio of the strong base to the raw material fiber is greater than 1:1, at this time, too much alkali is liable to cause corrosion to the inside of the raw material fiber to a large extent, so that the toughness of the raw material fiber after carbonization is significantly reduced.
Second, if the mass ratio of strong base to raw fiber is less than 0.8:1, in this case, the alkali does not activate the raw material fiber to an extent sufficient.
Preferably, in the fourth step, before drying, nano TiO is taken 2 Adding the activated carbon fiber into a solvent, adding the washed activated carbon fiber into the solvent, taking out the activated carbon fiber after complete impregnation, and drying the activated carbon fiber.
By adopting the technical scheme, the active carbon fiber is used as a carrier, and the nano TiO is prepared by 2 Attached to the activated carbon fiber, thus nano TiO 2 As a catalyst, the organic matters in the water can be catalyzed and oxidized to be decomposed into water and carbon dioxide, so that the content of organic poison in the water can be reduced.
Preferably, in the fifth step, after the activated carbon fiber cylinder is dried, the ultrafiltration membrane shell with the ultrafiltration membrane is directly installed in the activated carbon fiber cylinder.
By adopting the technical scheme, the activated carbon fiber is heated to be in an expanded state in the drying process. At this time, the ultrafiltration membrane shell can be easily installed in the activated carbon fiber cylinder. When the active carbon fiber cylinder is cooled, the active carbon fiber cylinder is contracted, so that the inner wall of the active carbon fiber cylinder is tightly attached to the outer wall of the ultrafiltration membrane shell. Thus, the scale with larger particles is not easy to deposit between the activated carbon fiber cylinder and the ultrafiltration membrane shell, and the scale can be smoothly removed through the activated carbon fiber cylinder during back cleaning, so that the cleaning effect of the filter element is ensured.
In a third aspect, the present application provides a water purification system, which adopts the following technical scheme:
the water purification system comprises the composite filter element communicated with a raw water inlet, wherein the composite filter element is communicated with a booster pump, the booster pump is communicated with an RO membrane filter element, and the RO membrane filter element is respectively communicated with a concentrated water outlet and a pure water outlet.
By adopting the technical scheme, the traditional composite filter element is replaced by the composite filter element, so that the volume of the composite filter element is reduced on the premise of ensuring normal filtering performance.
In summary, the application has the following beneficial effects:
1. because the activated carbon fiber is adopted to replace activated carbon, the activated carbon fiber and the ultrafiltration membrane can form a CMF membrane structure, so that the volume of the filter element can be reduced, and the water purifying effect can be ensured;
2. according to the application, the mixed fiber of the coconut fiber and the polyacrylonitrile fiber is preferably used as the raw material fiber, so that on one hand, the activated carbon fiber has a larger specific surface area and has a larger purification efficiency, and on the other hand, the toughness of the activated carbon fiber can be ensured;
3. according to the method, the raw material fibers are directly treated by the melted strong alkali, so that the raw materials can be quickly carbonized, and the carbon fibers can be activated, and the preparation efficiency of the activated carbon fibers is improved.
Drawings
FIG. 1 is a schematic structural view of a composite filter element according to embodiment 1 of the present application;
FIG. 2 is an exploded view of a composite filter element according to example 1 of the present application;
fig. 3 is a schematic diagram of a water purification system according to application example 1 of the present application;
FIG. 4 is a schematic diagram of a water purification system according to application example 1 of the present application;
FIG. 5 is a side view of a cartridge and composite filter element of application example 1 of the present application;
FIG. 6 is a cross-sectional view taken along the direction A-A in FIG. 5;
fig. 7 is a schematic structural view of a door according to application example 1 of the present application.
In the figure, 1, a shell; 11. a raw water inlet; 12. a concentrated water outlet; 13. a pure water outlet; 14. an opening; 15. an upper support block; 151. an upper clamping hole; 16. a lower support block; 161. a lower clamping hole; 17. closing the door; 171. an upper clamping block; 172. a lower clamping block; 18. an elastic sheet; 181. a locking hole; 2. a composite filter element; 21. an upper cover plate; 211. up-flanging; 212. a water outlet; 22. a PP cotton layer; 23. an activated carbon fiber cylinder; 231. a mounting cavity; 24. an ultrafiltration membrane shell; 241. a water inlet; 242. a glue fixing block; 243. a ring groove; 244. a seal ring; 25. an ultrafiltration membrane; 251. a water outlet hole; 26. a lower cover plate; 261. a lower flanging is carried out; 262. a plug-in piece; 3. placing a cylinder; 31. a limiting ring; 32. a placement cavity; 321. a groove is embedded; 322. a clamping groove; 4. a booster pump; 5. RO membrane filter core; 6. a water inlet electromagnetic valve; 7. a concentrated water electromagnetic valve; 8. high pressure solenoid valve.
Description of the embodiments
The application will be described in further detail with reference to the accompanying drawings and the following examples.
Example 1,
A preparation method of the composite filter element comprises the following steps:
firstly, melting lithium hydroxide, and then adding raw material fibers into the lithium hydroxide for mixing;
step two, heating the mixture of lithium hydroxide and raw material fibers to 520 ℃ at a speed of 12 ℃/min, and preserving heat for 2 hours to obtain activated carbon fibers;
step three, washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant at 7.0;
step four, preparing the washed activated carbon fiber into a cylinder according to requirements, and then drying at 80 ℃ to obtain an activated carbon fiber cylinder;
and fifthly, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder after the activated carbon fiber cylinder is dried, and assembling the activated carbon fiber cylinder and the PP cotton layer together to form the finished product composite filter element.
Wherein the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1:3. the mass ratio between the lithium hydroxide and the polyacrylonitrile fiber is 0.8:1.
referring to fig. 1 and 2, the composite filter element 2 includes an upper cover plate 21, a lower cover plate 26, an activated carbon fiber cartridge 23, an ultrafiltration membrane housing 24, an ultrafiltration membrane 25, and a PP cotton layer 22.
The activated carbon fiber tube 23 is in a cylindrical shape, and the activated carbon fiber tube 23 is formed by adding an adhesive into activated carbon particles and heating and sintering, so that the peripheral side wall of the activated carbon fiber tube 23 is provided with a through hole, and water can permeate from the axial side wall of the activated carbon fiber tube 23 and filter residual chlorine and foreign odor substances. The inside of the activated carbon fiber tube 23 is provided with an installation cavity 231, the installation cavity 231 is arranged along the length of the activated carbon fiber tube 23, one end of the installation cavity 231 is closed, the ultrafiltration membrane shell 24 is in a cylindrical shape, the ultrafiltration membrane shell 24 is embedded in the installation cavity 231, a plurality of water inlets 241 are formed in the side wall of the ultrafiltration membrane shell 24, one end of the ultrafiltration membrane shell 24, which is close to the opening 14 of the installation cavity 231, is fixedly connected with a solid glue block 242, one end of the ultrafiltration membrane 25 is fixedly connected to the solid glue block 242 and penetrates through the solid glue block 242, one end of the ultrafiltration membrane 25, which extends out of the solid glue block 242, is provided with a water outlet 251, and the mouth of the ultrafiltration membrane shell 24 is sealed by the solid glue block 242, so that water can only flow out from the water outlet 251 in the ultrafiltration membrane 25. Here, the ultrafiltration membrane 25 is placed in the ultrafiltration membrane housing 24, one end of the ultrafiltration membrane housing 24 extends out, then glue is poured into the end, and after the glue is solidified, the glue extending out of the ultrafiltration membrane housing 24 and the ultrafiltration membrane 25 are cut off to form a solid glue block 242.
The ultrafiltration membrane shell 24 is close to the one end of apopore 251 of milipore filter 25 and is equipped with the annular 243, and the annular 243 is embedded to be equipped with sealing washer 244, interference fit between the inside wall of sealing washer 244 and activated carbon fiber section of thick bamboo 23 for seal between the outside wall of milipore filter shell 24 and the inside wall of activated carbon fiber section of thick bamboo 23.
The PP cotton layer 22 is sleeved on the peripheral side wall of the activated carbon fiber cylinder 23, performs preliminary filtration on raw water, and intercepts particulate matters such as rust, sediment and the like.
The upper cover plate 21 is installed in the cotton layer 22 of PP and is close to the one end of the installation cavity 231 opening 14 of active carbon fiber section of thick bamboo 23, and one side that upper cover plate 21 is close to the cotton layer 22 of PP has last turn-ups 211, and last turn-ups 211 is the ring setting, and the cotton layer 22 of PP is located outward to last turn-ups 211 cover and laminating with the cotton layer 22 of PP for upper cover plate 21 is fixed in on the cotton layer 22 of PP. The upper cover plate 21 is provided with a water outlet 212, and the water outlet 212 and the water outlet 251 are mutually communicated, so that water entering the installation cavity 231 of the activated carbon fiber drum 23 from the PP cotton layer 22 flows into the ultrafiltration membrane 25, passes through the water outlet 251 and then flows out of the water outlet 212.
The lower cover plate 26 is installed in the cotton layer 22 of PP and keeps away from the one end of the installation cavity 231 opening 14 of active carbon fiber section of thick bamboo 23, and one side that is close to the cotton layer 22 of PP of lower cover plate 26 has turn-down 261, and turn-down 261 is the ring setting down, and turn-down 261 cover locates the cotton layer 22 of PP and laminating with the cotton layer 22 of PP outward for lower cover plate 26 is fixed in on the cotton layer 22 of PP.
The implementation principle of the composite filter element 2 in the embodiment 1 of the application is as follows: raw water enters the PP cotton layer 22 from the outer periphery of the composite filter element 2, particulate matters such as rust and sediment are filtered, residual chlorine and organic matters are filtered through the activated carbon fiber drum 23, the filtered residual chlorine and organic matters enter the ultrafiltration membrane shell 24, bacteria and viruses are removed through the ultrafiltration membrane 25, and finally water is discharged from the water outlet 212, and pure water flows out.
EXAMPLE 2,
A preparation method of the composite filter element comprises the following steps:
firstly, melting sodium hydroxide, and then adding raw material fibers into the sodium hydroxide for mixing;
step two, heating the mixture of sodium hydroxide and raw material fibers to 600 ℃ at a speed of 12 ℃/min, and preserving heat for 1h to obtain activated carbon fibers;
step three, washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant at 7.0;
step four, preparing the washed activated carbon fiber into a cylinder according to requirements, and then drying at 80 ℃ to obtain an activated carbon fiber cylinder;
and fifthly, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder after the activated carbon fiber cylinder is dried to form a finished product composite filter core which is provided with the activated carbon fiber cylinder 23, the ultrafiltration membrane shell 24 and the ultrafiltration membrane 25 from outside to inside.
Wherein the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1:5. the mass ratio between sodium hydroxide and polyacrylonitrile fiber is 1:1. the structure of the composite filter element was the same as in example 1.
Example 3
A preparation method of the composite filter element comprises the following steps:
step one, taking potassium hydroxide for melting, and then adding raw material fibers into the potassium hydroxide for mixing;
step two, heating the mixture of potassium hydroxide and raw material fibers to 560 ℃ at a speed of 12 ℃/min, and preserving heat for 1.5 hours to obtain activated carbon fibers;
step three, washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant at 7.0;
step four, preparing the washed activated carbon fiber into a cylinder according to requirements, and then drying at 80 ℃ to obtain an activated carbon fiber cylinder;
and fifthly, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder after the activated carbon fiber cylinder is dried to form a finished product composite filter core which is provided with the activated carbon fiber cylinder 23, the ultrafiltration membrane shell 24 and the ultrafiltration membrane 25 from outside to inside.
Wherein the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1:4. the mass ratio between the potassium hydroxide and the polyacrylonitrile fiber is 0.9:1. the structure of the composite filter element was the same as in example 1.
EXAMPLE 4,
This example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fiber is 0.8:1.
EXAMPLE 5,
This example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fiber is 1:1.
comparative example 1,
This comparative example differs from example 3 only in that the mass ratio between potassium hydroxide and the raw material fiber is 0.7:1.
comparative example 2,
This comparative example differs from example 3 only in that the mass ratio between potassium hydroxide and the raw material fiber is 1.2:1.
comparative example 3,
The present comparative example differs from example 3 only in that in step five of the present comparative example, the activated carbon fiber cartridge is dried and cooled, and then the ultrafiltration membrane housing with the ultrafiltration membrane is mounted in the activated carbon fiber cartridge.
EXAMPLE 6,
The present embodiment differs from embodiment 3 only in thatIn the fourth step, before drying, nano TiO is taken out 2 Adding the activated carbon fiber into DMF solvent to obtain liquid with solid-to-liquid ratio of 50g/L, adding the washed activated carbon fiber into the solvent, taking out after the activated carbon fiber is completely immersed for 10min, and drying.
Comparative example 4,
The comparative example differs from example 6 only in that the raw material fibers in the comparative example are all coconut fibers.
Comparative example 5,
The present comparative example differs from example 6 only in that the raw material fiber in the present comparative example is all polyacrylonitrile fiber.
Application example 1,
Referring to fig. 3 and 4, the water purifier includes a housing 1, an ultrafiltration membrane 25, a booster pump 4, an RO membrane cartridge 5, a water inlet solenoid valve 6, a concentrated water solenoid valve 7, and a high pressure solenoid valve 8.
Be equipped with raw water import 11, dense water export 12 and pure water export 13 on the shell 1, milipore filter 25, booster pump 4, RO membrane filter core 5, intake solenoid valve 6, dense water solenoid valve 7 and high pressure solenoid valve 8 are all placed in shell 1, compound filter core 2 and raw water import 11 pass through the water pipe intercommunication, compound filter core 2 passes through the one end intercommunication of water pipe and booster pump 4, the other end of booster pump 4 passes through the water pipe and communicates with RO membrane filter core 5, RO membrane filter core 5 communicates with dense water export 12 and pure water export 13, make the raw water that gets into from raw water import 11 flow out respectively from dense water export 12 and pure water export 13 after milipore filter core 25 and RO membrane filter core 5, the intercommunication water pipe is not drawn here.
A water inlet solenoid valve 6 is installed between the composite filter element 2 and the booster pump 4 to cut off the water supply of the system when the system stops making water. The concentrated water valve 7 is arranged on the RO membrane filter core 5 and the concentrated water outlet 12 so that the waste water of the RO membrane filter core 5 can be discharged. A high-pressure electromagnetic valve 8 is installed between the RO membrane filter core 5 and the pure water outlet 13 to control water production.
The shell 1 is fixedly connected with a placement barrel 3, and the number of the placement barrels 3 is two to place the composite filter element 2 and the RO membrane filter element 5. The shell 1 is fixedly connected with the elastic sheets 18, the number of the elastic sheets 18 is at least four, the number of the elastic sheets 18 is eight, the elastic sheets 18 are matched with each other to form the locking holes 181, and the placing cylinder 3 is arranged in the locking holes 181 in a penetrating mode, so that the placing cylinder 3 is not easy to shake. The placing cylinder 3 is fixedly connected with two limiting rings 31, and the two limiting rings 31 are respectively abutted on the upper side wall and the lower side wall of the elastic piece 18, so that the placing cylinder 3 is not easy to slide after penetrating through the locking hole 181.
Referring to fig. 5 and 6, a plurality of inserting pieces 262 are fixedly connected to one side, far away from the downward flange 261, of the lower cover plate 26, the inserting pieces 262 are obliquely arranged outwards, an embedded groove 321 is formed in the cavity bottom of the placing cavity 32, the lower cover plate 26 is embedded in the embedded groove 321, a plurality of clamping grooves 322 are formed in the groove bottom of the embedded groove 321, and the inserting pieces 262 are inserted and clamped in the clamping grooves 322, so that the lower cover plate 26 is fixed in the embedded groove 321.
Referring to fig. 3 and 7, an opening 14 is provided at one side of the housing 1, and a closing door 17 is detachably coupled to the housing 1 to close the opening 14.
The cover door 17 is close to the one end fixedly connected with of shell 1 and goes up joint piece 171 and lower joint piece 172, goes up the joint piece 171 and is located the upside of cover door 17, and the upper lateral wall that shell 1 is close to opening 14 is gone up fixedly connected with and goes up supporting shoe 15, is equipped with on the supporting shoe 15 and goes up joint hole 151, goes up joint piece 171 and inserts the joint in last joint hole 151. The lower clamping block 172 is located at the lower side of the closing door 17, the lower supporting block 16 is fixedly connected to the side wall of the casing 1, close to the opening 14, a lower clamping hole 161 is formed in the lower supporting block 16, and the lower clamping block 172 is inserted into and clamped in the lower clamping hole 161 to cooperate with the lower clamping block 172 to fix the closing door 17 on the casing 1.
The implementation principle of the water purifying system of the application is as follows: raw water enters from a raw water inlet 11, enters into the composite filter element 2 through a water inlet electromagnetic valve 6, is subjected to secondary filtration through an RO membrane filter element 5, and flows out from a concentrated water outlet 12 through a concentrated water electromagnetic valve 7, and pure water flows out from a pure water outlet 13 through a high-pressure electromagnetic valve 8.
Here, the RO membrane reverse osmosis filter element is an RO membrane reverse osmosis filter element with model 669 purchased from Shenzhen rain pure environmental protection technology Co.
A detection method,
1. Bending strength test is carried out on the activated carbon fiber by using a bending resistance tester;
2. respectively fixing the activated carbon fiber cylinder and the ultrafiltration membrane shell by using a pulling machine, then pulling, and testing the tensile strength required by separation of the activated carbon fiber cylinder and the ultrafiltration membrane shell;
3. examples 1 to 5 and comparative examples 1 to 4 were used as composite cartridges of the water purification system of application example 1, respectively, as-is water containing 100ug/L of chlorine, 100ug/L of amine and 100ug/L of benzene was purified, and the content of chlorine, amine and benzene in the purified water was detected by chromatography.
The test results are shown in Table one:
table test results of examples 1 to 6 and comparative examples 1 to 4
In combination with the comparison of examples 3 to 5 with comparative examples 1 and 2, and with the combination of table one, it can be seen that when the mass ratio between potassium hydroxide and raw fiber is controlled to be (0.8 to 1): 1, the carbon fiber can be fully activated, and the toughness of the activated carbon fiber can be ensured;
in the fifth step, after the activated carbon fiber cylinder is dried, the ultrafiltration membrane shell with the ultrafiltration membrane is directly arranged in the activated carbon fiber cylinder, so that the activated carbon fiber cylinder and the ultrafiltration membrane shell can be tightly fixed together, and the purification efficiency is ensured;
by combining the embodiment 3 and the embodiment 6 and combining the table I, the active carbon fiber modified by the nano titanium dioxide can effectively remove organic matters in water in the process of purifying the water, thereby further improving the water purifying effect;
by combining the comparison of the example 3 with the comparison example 4 and the comparison example 5 and combining the table one, the coconut shell fiber and the polyacrylonitrile fiber are selected as the mixed fibers to prepare the activated carbon fiber, so that the prepared composite filter element can be ensured to have stronger purification efficiency, and the stability of the raw material fiber can be ensured when the composite filter element is mixed with strong alkali for treatment.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (1)
1. A water purifier, characterized in that: the device comprises a shell (1), an ultrafiltration membrane (25), a booster pump (4), an RO membrane filter core (5), a water inlet electromagnetic valve (6), a concentrated water electromagnetic valve (7), a high-pressure electromagnetic valve (8) and a composite filter core (2) communicated with a raw water inlet (11), wherein the composite filter core (2) is communicated with the booster pump (4), the booster pump (4) is communicated with the RO membrane filter core (5), the RO membrane filter core (5) is respectively communicated with a concentrated water outlet (12) and a pure water outlet (13), the water inlet electromagnetic valve (6) is arranged between the composite filter core (2) and the booster pump (4), the concentrated water electromagnetic valve (7) is arranged between the RO membrane filter core (5) and the concentrated water outlet (12), the high-pressure electromagnetic valve (8) is arranged between the RO membrane filter core (5) and the pure water outlet (13), a placing cylinder (3) is fixedly connected in the shell (1), the quantity of the placing cylinder (3) is two, the number of the placing cylinder (2) and the RO membrane filter core (5) are fixedly connected with an elastic sheet (18) on the shell (1), the elastic sheet (18) is arranged in the eight elastic sheets (181) and the number of the elastic sheet (18) is not in a locking way, and the two elastic sheets (181) are arranged in the two locking cylinders (181) and are formed, the upper side of the placing cylinder (3) is fixedly connected with limiting rings (31), the number of the limiting rings (31) is two, the two limiting rings (31) are respectively abutted to the upper side wall and the lower side wall of the elastic sheet (18), the composite filter element (2) comprises an upper cover plate (21), a lower cover plate (26), an activated carbon fiber cylinder (23), an ultrafiltration membrane shell (24), an ultrafiltration membrane (25) and a PP cotton layer (22), one side of the lower cover plate (26) far away from the lower flanging (261) is fixedly connected with a plurality of inserting pieces (262), the inserting pieces (262) are obliquely arranged outwards, the cavity bottom of the placing cavity (32) is provided with an embedding groove (321), the lower cover plate (26) is embedded in the embedding groove (321), the groove bottom of the embedding groove (321) is provided with a plurality of clamping grooves (322), the inserting pieces (262) are inserted into the clamping grooves (322), one side of the shell (1) is provided with an opening (14), the shell (1) is detachably connected with a cover door (17), one end of the cover door (17) close to the shell (1) is fixedly connected with an upper clamping block (171) and the upper side (15) close to the upper side (17), an upper clamping hole (151) is formed in the upper supporting block (15), an upper clamping block (171) is inserted into the upper clamping hole (151), a lower clamping block (172) is located on the lower side of the cover door (17), a lower supporting block (16) is fixedly connected to the lower side wall, close to the opening (14), of the shell (1), a lower clamping hole (161) is formed in the lower supporting block (16), and the lower clamping block (172) is inserted into and clamped in the lower clamping hole (161) and is matched with the lower clamping hole to fix the cover door (17) on the shell (1);
the preparation method of the composite filter element comprises the following steps,
step one, taking potassium hydroxide for melting, and then adding raw material fibers into the potassium hydroxide for mixing;
step two, heating the mixture of potassium hydroxide and raw material fiber to 520-600 ℃ at a speed of 12 ℃/min, and preserving heat for 1-2 hours to obtain activated carbon fiber;
step three, washing the activated carbon fiber with hydrochloric acid and distilled water until the pH value of the washing liquid is constant at 7.0;
step four, taking nano TiO 2 Adding the activated carbon fiber into a solvent, preparing the washed activated carbon fiber into a cylinder according to requirements, adding the cylinder into the solvent, taking out the activated carbon fiber after complete impregnation, and then drying the activated carbon fiber at 80 ℃ to obtain an activated carbon fiber cylinder;
step five, after the activated carbon fiber cylinder is dried, directly installing an ultrafiltration membrane shell with an ultrafiltration membrane into the activated carbon fiber cylinder, and assembling the ultrafiltration membrane shell and a PP cotton layer together to form a composite filter element;
the composite filter element comprises a PP cotton layer (22), an active carbon fiber cylinder (23), an ultrafiltration membrane shell (24) and an ultrafiltration membrane (25) from outside to inside; in addition, in the first step, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1: (5-3), the mass ratio of potassium hydroxide to raw material fiber is (0.8-1): 1.
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| CN202110159521.1A CN112960784B (en) | 2021-02-05 | 2021-02-05 | Composite filter element, preparation method thereof and water purifier with composite filter element |
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