CN112316725B - Long-acting filtering system and method for filter element - Google Patents
Long-acting filtering system and method for filter element Download PDFInfo
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- CN112316725B CN112316725B CN202010911842.8A CN202010911842A CN112316725B CN 112316725 B CN112316725 B CN 112316725B CN 202010911842 A CN202010911842 A CN 202010911842A CN 112316725 B CN112316725 B CN 112316725B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
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Abstract
The invention relates to a long-acting filtering system of a filter element, which comprises a filter element, a water inlet flow passage and a water outlet flow passage, wherein the water inlet flow passage and the water outlet flow passage are connected with the filter element; the first water inlet and the second water inlet are respectively connected with the water inlet flow channel, and the first water outlet and the second water outlet are respectively connected with the water outlet flow channel. The invention also relates to a long-acting filtering method of the filter element, which is used for alternately changing the flow direction of water in the filter element in the water preparation process. The long-acting filtering system and the method can alternately change the flow direction of water in the filter element, so that the shearing force applied to the filtering membrane in the filter element is changed along with the different flow directions of the water, the utilization rate of the filtering membrane is improved, and the long-acting filtering system and the long-acting filtering method are longer in time and higher in utilization rate under the original state of the area of the filtering membrane.
Description
Technical Field
The invention relates to the technical field of water purification, and also relates to a long-acting filtering system of a filter element and a long-acting filtering method of the filter element.
Background
In the water purification system, the water purification flow can be smaller and smaller along with the increase of service time, mainly because the filter core in the water purification system has concentration polarization and solute crystallization's condition at filtration system, causes filter membrane more and more stifled to lead to the water purification flow to be smaller and smaller. Chinese utility model patent No. CN211035451U (application No. 201921849304.X) discloses a ceramic nanofiltration membrane water purifier, wherein an ultrafiltration membrane backwashing pipeline and a nanofiltration membrane backwashing pipeline are arranged in the disclosed water purifier, and during use, when certain pollutants are accumulated on the filtration membrane, a backwashing operation of filtering is performed, so as to prolong the service life of the filter element.
The filter element that has used now is the filter element of formula of book usually, and in the use of filter element, the direction of rivers has the shearing force to the filtration membrane of filter element, and the size of shearing force is along with axial flow direction and gradual change, and the crystallization that causes concentrated water different positions on filtration membrane blocks up the degree difference, and the jam degree of the upstream position of filter element can be less than the jam degree of filter element low reaches, and the partial jam condition of filter element also can lead to the clean water flow of whole filter element to reduce, and filter element availability factor step-down. Although the overall water-passing capacity of the filter element can be improved by the backwashing operation, the problem of uneven distribution of the blocking degree on the filter element cannot be solved along with the increase of the service time of the filter element, the filtering capacity of the upstream section of the filter element cannot be fully utilized, namely the filter element needs to be replaced, the period for replacing the filter element is short, and the service efficiency of the filter element is low.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a long-acting filtration system of a filter element, which can effectively prolong the service time of the filter element and improve the service efficiency of the filter element, aiming at the above prior art.
The second technical problem to be solved by the present invention is to provide a long-lasting filtration method of a filter element, which can improve the uniformity of the permeation flux of the filter element and improve the utilization rate of the filtration membrane in the filter element, aiming at the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the long-acting filtering system of the filter element comprises the filter element, a water inlet flow channel and a water outlet flow channel, wherein the water inlet flow channel and the water outlet flow channel are connected with the filter element, and the long-acting filtering system is characterized in that: one end of the filter element is provided with a first water inlet and a second water outlet, the other end of the filter element is provided with a second water inlet and a first water outlet, the first water inlet and the first water outlet are matched and communicated for filtering, and the second water inlet and the second water outlet are matched and communicated for filtering; the first water inlet and the second water inlet are respectively connected with the water inlet flow channel, and the first water outlet and the second water outlet are respectively connected with the water outlet flow channel.
In order to facilitate the flushing of the filter element and prolong the service life of the filter element, the filter element flushing device further comprises a flushing flow passage, the first water inlet is communicated with the flushing flow passage through a first flushing pipe, the second water inlet is communicated with the flushing flow passage through a second flushing pipe, a first switch valve is arranged on the first flushing pipe, and a second switch valve is arranged on the second flushing pipe.
In order to avoid the backflow of washing water into the filter element, a check valve is arranged on the washing flow channel.
In order to conveniently switch and conduct the first water inlet and the second water inlet, the water inlet device further comprises a three-way valve, an inlet of the three-way valve is communicated with the water inlet flow channel, one outlet of the three-way valve is connected with the first water inlet, and the other outlet of the three-way valve is connected with the second water inlet.
In order to control the matching and conduction of the first water outlet and the second water outlet with the first water inlet and the second water inlet conveniently, the first water outlet is connected with the water outlet flow channel through a first water outlet pipe, the second water outlet is connected with the water outlet flow channel through a second water outlet pipe, a third switch valve is arranged on the first water outlet pipe, and a fourth switch valve is arranged on the second water outlet pipe.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a long-acting filtering method of a filter element is characterized in that: in the process of making water, the flow direction of water in the filter element is alternately changed.
In order to more fully utilize the filtering membrane in the filtering core and improve the uniformity of the crystallization concentration on the filtering membrane, the flow direction alternation period of the water in the filtering core is adjusted and replaced according to different conditions of the purified water flow.
As an improvement, in a washing cycle time range, the water flow direction in the filter element is controlled to be changed according to different alternating periods aiming at different time intervals in the washing cycle time range, wherein the washing cycle time range comprises a rapid attenuation period time interval for rapid reduction of the purified water flow, a slow attenuation period time interval for slow attenuation of the purified water flow and a stable transition period time interval for keeping the water inlet flow stable.
Simply, setting purified water flow threshold intervals corresponding to different time intervals, detecting the purified water flow in real time during water production, determining the current time interval according to the purified water flow, and further determining the corresponding alternating period of the flow direction of the water in the filter element replacement according to the current time interval.
In order to prolong the service life of the filter element, the water making working time is timed, and if the water making working time exceeds the set flushing period, the filter element is controlled to be flushed.
Compared with the prior art, the invention has the advantages that: according to the long-acting filtering system of the filter element, two groups of water inlets and water outlets capable of realizing that water flows in the filter element in opposite flow directions are arranged at two ends of the filter element, so that the water is alternately replaced in the filter element through the conduction control of the two groups of water inlets and the two groups of water outlets, namely, the long-acting filtering method for alternately replacing the flow directions of the water in the filter element enables the shearing force applied to the filtering membrane in the filter element to be changed along with the different flow directions of the water, the crystallization concentration of the filtering membrane at a single position is reduced, the utilization rate of the filtering membrane is improved, the aging is longer and the utilization rate is higher in the original state of the area of the filtering membrane, the service life of the filter element is further prolonged, the replacing period of the filter element is prolonged, and the use cost is reduced.
Drawings
FIG. 1 is a schematic view of a long lasting filtration system of a filter cartridge in an embodiment of the present invention.
FIG. 2 is a graph of the flow of purified water at different time intervals within a time range of a flush cycle in accordance with an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the long-term filtering system of the filter element in this embodiment includes a filter element 1, a water inlet channel 2, a water outlet channel 3, a flushing channel 4, and a three-way valve 5.
One end of the filter element 1 in this embodiment is provided with a first water inlet 11 and a second water outlet 12, and the other end of the filter element 1 is provided with a second water inlet 13 and a first water outlet 14. The first water inlet 11 and the second water inlet 13 are respectively connected with the water inlet flow passage 2 through the three-way valve 5, the inlet of the three-way valve 5 is communicated with the water inlet flow passage 2, one outlet of the three-way valve 5 is connected with the first water inlet 11, and the other outlet of the three-way valve 5 is connected with the second water inlet 13. Two outlets of the three-way valve 5 can be switched on, so as to determine whether the first water inlet 11 and the second water inlet 13 are communicated or not. The first water outlet 14 and the second water outlet 12 are respectively connected to the water outlet channel 3, specifically, the first water outlet 14 is connected to the water outlet channel 3 through a first water outlet pipe 31, the second water outlet 12 is connected to the water outlet channel 3 through a second water outlet pipe 32, the first water outlet pipe 31 is provided with a third switch valve 311, and the second water outlet pipe 32 is provided with a fourth switch valve 321. During the use, through the cooperation of three-way valve 5, third ooff valve 311, fourth ooff valve 321 for first water inlet 11 matches to switch on with first delivery port 14 and filters or second water inlet 13 matches to switch on with second delivery port 12 and filters, and then can make the rivers direction in the filter core 1 change. When the three-way valve 5 is controlled to open the first water inlet 11 and close the second water inlet 13, the third switch valve 311 and the fourth switch valve 321 are controlled to open at the same time, and at this time, the entering water can flow in from one end of the first water inlet 11 of the filter element 1 and flow out from the first water outlet 14 at the other end. When the three-way valve 5 is controlled to open the second water inlet 13 and close the first water inlet 11, the third switch valve 311 and the fourth switch valve 321 are simultaneously controlled to be closed, and at this time, the entering water can flow in from one end of the second water inlet 13 of the filter element 1 and flow out from the second water outlet 12 at the other end. Thus, the water flow direction in the filter element 1 is changed.
In order to flush the filter element 1, the first water inlet 11 is connected to the flush flow path 4 through a first flush pipe 41, the second water inlet 13 is connected to the flush flow path 4 through a second flush pipe 42, a first on-off valve 411 is provided in the first flush pipe 41, and a second on-off valve 421 is provided in the second flush pipe 42. When the three-way valve 5 turns on the first water inlet 11, the first switch valve 411 is turned off, the second switch valve 421 is turned on, the third switch valve 311 is turned off, and the fourth switch valve 321 is turned off, so that the washing water entering from the first water inlet 11 flows out through the second water inlet 13, passes through the second washing pipe 42, and is discharged from the washing flow passage 4. When the three-way valve 5 turns on the second water inlet 13, the first switch valve 411 is controlled to be turned on, the second switch valve 421 is turned off, the third switch valve 311 is turned off, and the fourth switch valve 321 is turned off, so that the washing water entering from the second water inlet 13 flows out through the first water inlet 11, passes through the first washing pipe 41, and is discharged from the washing flow passage 4. In order to prevent the water after flushing from flowing back into the filter element 1, a check valve 43 is provided in the flushing flow passage 4.
The long-acting filtering method of the filter element in the embodiment can be realized by the long-acting filtering system of the filter element. The long-acting filtering method of the filter element in the embodiment comprises the following steps: in the process of making water, the flow direction of water in the filter element 1 is alternately changed. According to specific conditions, the flow direction of the water in the filter element 1 can be changed by adopting a fixed alternating period, and the change of the flow direction of the water in the filter element 1 can be realized by controlling the three-way valve 5, the third on-off valve 311 and the fourth on-off valve 321. In addition, the working time of water production is timed, and if the working time of water production exceeds the set flushing period, the filter element 1 is controlled to be flushed, so that the dirt accumulated in the filter element 1 is effectively removed, and the service life of the filter element 1 is prolonged.
In this embodiment, the alternation period of the flow direction of the water in the replaceable filter element 1 is set according to the use characteristics of the filter element 1. Generally, when the filter element 1 is used in the previous period, the filter element 1 exerts a good filtering effect, the speed of dirt accumulation on the filtering membrane in the corresponding filter element 1 is high, and the purified water flow rate is also reduced rapidly on the basis of the purified water amount. When the dirt on the filtering membrane is accumulated to a certain amount, the difficulty of dirt accumulation is higher and higher, the dirt accumulation speed on the filtering membrane is correspondingly reduced, and the corresponding speed of pure water flow reduction is also reduced. And when the dirt on the filtering membrane is accumulated continuously, the influence on the purified water flow is small, and the purified water flow is basically kept unchanged. According to the characteristics of the filter element 1, a washing cycle time range of the filter element 1 is divided into different time intervals, in the embodiment, in a washing cycle time range, the washing cycle time range comprises a rapid attenuation period time interval in which the flow rate of purified water is rapidly reduced, a slow attenuation period time interval in which the flow rate of purified water is slowly attenuated and a stable transition period time interval in which the flow rate of inlet water is kept stable, and the flow direction of water in the filter element 1 can be controlled to be changed according to different alternating cycles aiming at different time intervals in the washing cycle time range.
In this embodiment, the alternating period of the flow direction of the water in the replaceable filter element 1 is adjusted according to different conditions of the flow rate of the purified water. Specifically, the purified water flow threshold intervals corresponding to different time intervals are set, the purified water flow is detected in real time during water production, the current time interval is determined according to the purified water flow, and the corresponding alternating period of the flow direction of the water in the filter element replacement 1 is determined according to the current time interval.
Aiming at the water purifier provided with the long-acting filtering system of the filter element, a water flow sensor is arranged at the water outlet end of the water purifier, purified water flow data in the working process of the filter element 1 is obtained in an experimental mode before leaving a factory, a curve graph shown in figure 2 is further obtained, three different time intervals are determined according to the characteristics of the purified water flow in the curve graph, water flow thresholds corresponding to the different time intervals are further determined, meanwhile, the flow direction alternation period of water in the filter element 1 to be replaced corresponding to each time interval is also obtained according to the experiment, the larger the purified water flow is, the shorter the required alternation period is, the phenomenon that dirt is excessively accumulated at a single position of the filtering membrane in the filter element 1 is avoided, and the distribution uniformity of the dirt in the filtering membrane in the filter element 1 is improved.
In this embodiment, two water flow thresholds V1 and V2 are obtained, V1 is greater than V2 is greater than 0, the purified water flow V of the output purified water is detected in real time, and when V is greater than V1, it is determined that the current filter element 1 is in a rapid decay period time interval, and then the flow direction of water in the filter element 1 is alternately changed according to an alternate period T1 corresponding to the rapid decay period time interval. When V is more than V2 and less than or equal to V1, the current filter element 1 is judged to be in the slow decay period time interval, and the flow direction of the water in the filter element 1 is alternately changed according to the alternating period T2 corresponding to the slow decay period time interval. When V is less than or equal to V2, the current filter element 1 is judged to be in the stable transition period time interval, and the flow direction of the water in the filter element 1 is alternately changed according to the alternating period T3 corresponding to the stable transition period time interval. Wherein T1 < T2 < T3.
According to the long-acting filtering system of the filter element, two groups of water inlets and water outlets capable of enabling water flow to flow in the filter element 1 in opposite flow directions are arranged at two ends of the filter element 1, so that the flow directions of water in the filter element 1 are alternately changed through conducting control of the two groups of water inlets and the two groups of water outlets, namely, the long-acting filtering method for alternately changing the flow directions of the water in the filter element 1 enables shearing force applied to a filtering membrane in the filter element 1 to be changed along with different flow directions of the water, so that the crystallization concentration of the filtering membrane at a single position is reduced, the utilization rate of the filtering membrane is improved, the aging is longer and the utilization rate is higher in the original state of the area of the filtering membrane, the service life of the filter element 1 is further prolonged, the replacement period of the filter element 1 is prolonged, and the use cost is reduced.
Claims (8)
1. The utility model provides a long-term filtration system of filter core, includes filter core (1), the water inlet flow way (2) and the play water flow way (3) that are connected with filter core (1), its characterized in that: a first water inlet (11) and a second water outlet (12) are formed in one end of the filter element (1), a second water inlet (13) and a first water outlet (14) are formed in the other end of the filter element (1), the first water inlet (11) and the first water outlet (14) are matched and communicated for filtering, and the second water inlet (13) and the second water outlet (12) are matched and communicated for filtering; the first water inlet (11) and the second water inlet (13) are respectively connected with the water inlet flow channel (2), and the first water outlet (14) and the second water outlet (12) are respectively connected with the water outlet flow channel (3);
the water inlet flow channel (2) is communicated with the inlet of the three-way valve (5), one outlet of the three-way valve (5) is connected with the first water inlet (11), and the other outlet of the three-way valve (5) is connected with the second water inlet (13);
the first water outlet (14) is connected with the water outlet flow channel (3) through a first water outlet pipe (31), the second water outlet (12) is connected with the water outlet flow channel (3) through a second water outlet pipe (32), a third switch valve (311) is arranged on the first water outlet pipe (31), and a fourth switch valve (321) is arranged on the second water outlet pipe (32).
2. The long-term filtration system of claim 1, wherein: the washing device is characterized by further comprising a washing flow channel (4), the first water inlet (11) is communicated with the washing flow channel (4) through a first washing pipe (41), the second water inlet (13) is communicated with the washing flow channel (4) through a second washing pipe (42), a first switch valve (411) is arranged on the first washing pipe (41), and a second switch valve (421) is arranged on the second washing pipe (42).
3. The long-term filtration system of claim 2, wherein: and a check valve (43) is arranged on the flushing flow passage (4).
4. A method of long-lasting filtration of a long-lasting filtration system of a filter cartridge according to any one of claims 1 to 3, characterized in that: in the process of water production, the first water inlet (11) and the first water outlet (14) are controlled to be matched and conducted for filtering or the second water inlet (13) and the second water outlet (12) are controlled to be matched and conducted for filtering, and then the flow direction of water in the filter element (1) is alternately changed.
5. The long-term filtration method of claim 4, wherein: the alternating period of the flow direction of the water in the filter element (1) is adjusted according to different conditions of the flow rate of the purified water.
6. The long-term filtration method of claim 5, wherein: in a washing cycle time range, the water flow direction of the filter element (1) is controlled to be changed according to different alternating periods aiming at different time intervals in the washing cycle time range, wherein the washing cycle time range comprises a rapid attenuation period time interval for rapid reduction of the purified water flow, a slow attenuation period time interval for slow attenuation of the purified water flow and a stable transition period time interval for keeping the water inlet flow stable.
7. The long-term filtration method of claim 6, wherein: setting purified water flow threshold intervals corresponding to different time intervals, detecting the purified water flow in real time during water production, determining the current time interval according to the purified water flow, and further determining the corresponding alternating period of the flow direction of the water in the filter element replacement (1) according to the current time interval.
8. The long-term filtration method according to any one of claims 4 to 7, wherein: and timing the water making working time, and controlling the filter element (1) to be washed if the water making working time exceeds the set washing period duration.
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| CN202010911842.8A CN112316725B (en) | 2020-09-02 | 2020-09-02 | Long-acting filtering system and method for filter element |
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| CN202010911842.8A CN112316725B (en) | 2020-09-02 | 2020-09-02 | Long-acting filtering system and method for filter element |
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