CN105198111B - The household water filter of automatic cleaning filter membranes and method - Google Patents
The household water filter of automatic cleaning filter membranes and method Download PDFInfo
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- CN105198111B CN105198111B CN201510752943.4A CN201510752943A CN105198111B CN 105198111 B CN105198111 B CN 105198111B CN 201510752943 A CN201510752943 A CN 201510752943A CN 105198111 B CN105198111 B CN 105198111B
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Abstract
Disclose the household water filter of a kind of automatic cleaning filter membranes, including inlet valve, ultrafilter membrane, a TDS sensor, high-pressure pump, reverse osmosis membrane, proportioning valve, post active carbon, the 2nd TDS sensor, pressure vessel, ultrafilter membrane late gate, reverse osmosis membrane late gate, check-valves before tank, flowing water Valve, by-pass valve, flushing valve, first to three wastes penstock, the detection part of the transmembrane pressure of detection ultrafilter membrane, and controls the control device of this household water filter work.Control device controls household water filter according to the ratio of transmembrane pressure Yu threshold pressure differential and is in cleaning model or controlling the water circulation pattern.When transmembrane pressure is more than threshold pressure differential, controls device and make the automatic cleaning filter membranes of household water filter.The household water filter of the present invention can extend the service life of filter membrane, reduces the use cost of household water filter.
Description
Technical field
Present invention relates in general to household water filter, more particularly to a kind of can automatically cleaning filter membranes, exempt to change the household water filter of filter element and method.
Background technology
Arrival along with economy era, healthy drinking-water makes people increasingly pay attention to water purification, and the water difference due to region or the impact of environment, the degree of purity of water, the quality problem of water is the most different, water purifier on the market is by highly purified for water filtration, so eliminate the harmful substance in water, mineral in water is also filtered out simultaneously, a lot of mineral in water are all needed by human body, the health of the most unfavorable human body, but do not filter and harmful substance is absorbed, so cause a lot of inconvenience.
The version of existing household water filter has multiple.Such as, ZL2005101304043 discloses a kind of household water filter of entitled " a kind of method and apparatus preventing domestic water purifier discharge water from generating secondary pollution ".But, water is purified by household water filter many employings Filtration of prior art.Use filter membrane to remove the impurity in water owing to using Filtration to be necessarily required to.Impurity in water can cause filter membrane that blocking occurs thus affect controlling the water circulation quality, so that often clean or change filter membrane.But, general filter membrane is to the little granule foreign poor removal effect in water.In order to remove impurities in water, the most directly use reverse osmosis membrane.The use of reverse osmosis membrane not only can go the removal of impurity, also can filter the mineral useful to health simultaneously, cause made water to lack mineral.Therefore, the household water filter of prior art or use inconvenience, poor removal effect to the little granule foreign in water, or water can be caused to lack useful mineral.
To sum up, prior art exists can reduce the needs changing the water purification technology that filter membrane can reduce water mineral content loss simultaneously.
Summary of the invention
The problem existed for above-mentioned prior art, the present invention provide a kind of can the household water filter of cleaning filter membranes automatically.
nullFor achieving the above object，The present invention provides the household water filter of a kind of automatic cleaning filter membranes，Including inlet valve，Ultrafilter membrane，The TDS sensor being arranged between inlet valve and ultrafilter membrane，High-pressure pump，The reverse osmosis membrane being connected with high pressure pump outlet end，Proportioning valve，The post active carbon being connected with the proportioning valve port of export，The 2nd TDS sensor being connected with the post active carbon port of export，Pressure vessel，Connect ultrafilter membrane and the ultrafilter membrane late gate of high pressure pump inlet end，It is arranged on the reverse osmosis membrane late gate between the reverse osmosis membrane port of export and an arrival end of proportioning valve，It is arranged on check-valves before the tank between the 2nd TDS sensor and pressure vessel arrival end，It is arranged on the flowing water Valve of pressure vessel water side，The by-pass valve being connected between ultrafilter membrane with proportioning valve and with ultrafilter membrane late gate arrival end，Connect the flushing valve of pressure vessel and ultrafilter membrane，First and second waste water valves of ultrafilter membrane，The three wastes penstock of reverse osmosis membrane，The detection part of the transmembrane pressure of detection ultrafilter membrane，With the control device controlling the work of this household water filter；
The transmembrane pressure of detection is sent to control device by detection part, and a TDS value and the 2nd TDS value of detection are sent to control device by a TDS sensor and the 2nd TDS sensor respectively；
Control device to be compared with threshold pressure differential by described transmembrane pressure, make household water filter be in cleaning model when transmembrane pressure is more than threshold pressure differential, otherwise make household water filter be in controlling the water circulation pattern；
In a cleaning mode, control the TDS value that detect according to a TDS sensor of device and the 2nd TDS value that the 2nd TDS sensor detects and a default TDS standard value and the 2nd TDS threshold value determine scavenging period t, there is provided the switching signal of each valve to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first to three wastes penstock, and rinse ultrafilter membrane and reverse osmosis membrane according to the scavenging period determined；
Under controlling the water circulation pattern, described control device provides the switching signal of each valve to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first to three wastes penstock, and controls the proportioning valve TDS value purifying water with regulation post active carbon according to the 2nd TDS value.
Wherein, described scavenging period is determined by following formula:
β=(TDS1-TDSstandard)/TDSstandard
In formula, TDS1 is a TDS value, TDSstandardBeing a TDS standard value, Δ p is the transmembrane pressure of detection, Δ peFor threshold pressure differential, t0For the standard cleaning time, t is scavenging period.
In the present invention, control device and automatically clean ultrafilter membrane and reverse osmosis membrane owing to have employed according to the change of the change of the transmembrane pressure of ultrafilter membrane and water quality from the beginning, it is possible to extend the service life of filter membrane, reduce the use cost of household water filter.Further, due to can be according to transmembrane pressure and predetermined threshold, and a TDS value of tap water and a TDS standard value dynamically adjust the time of cleaning filter membranes, can improve the efficiency of cleaning filter membranes further and reduce the consumption to the resource such as water, electricity.Additionally, control the TDS value purifying water that device can detect according to the 2nd TDS sensor, regulate proportioning valve thus adjust the TDS value purifying water, it is provided that purify the quality of water.
Accompanying drawing explanation
Fig. 1 is the structural representation of the household water filter of automatic cleaning filter membranes according to embodiments of the present invention.
Fig. 2 is the schematic diagram of the control part of household water filter according to embodiments of the present invention.
Fig. 3 is the schematic flow sheet of the method for the automatic cleaning filter membranes of household water filter according to embodiments of the present invention.
Detailed description of the invention
Below in conjunction with concrete accompanying drawing, the invention will be further described.
Skilled in the art realises that, TDS refers to the dissolvability solid amount in water.TDS value is the highest, shows that the impurity in water is the most.According to the household water filter of the present invention, using 2 filter membranes, one is ultrafilter membrane, and one is reverse osmosis membrane.Ultrafiltration is for filtering the impurity in tap water, but it is essentially without the mineral loss caused in water.Reverse osmosis membrane was used for the fine impurity in drainage, including mineral.In order to avoid the loss of too much water mineral, adoption rate valve of the present invention so that the part producing water of ultrafilter membrane is directly entered the first arrival end of proportioning valve, and another part generates reverse osmosis water through reverse osmosis membrane and enters the second arrival end of proportioning valve.The ultrafiltration water entering the first arrival end and the reverse osmosis water entering the second arrival end flow into post active carbon after mixing in proportioning valve, produce purification water to be drunk.In the present invention, according to the water quality condition of tap water, when transmembrane pressure ultrafilter membrane being detected is more than predetermined threshold, household water filter starts automatic cleaning filter membranes.Due to can cleaning filter membranes automatically, the service life of filter membrane in the case of the quality ensureing institute's controlling the water circulation, can be extended, reduce the use cost of household water filter.In the present invention, filter membrane is the general name of ultrafilter membrane and reverse osmosis membrane.
nullAs shown in Figure 1，The household water filter of the automatic cleaning filter membranes of the present invention includes inlet valve 1，Ultrafilter membrane 2，The TDS sensor (Fig. 1 is not shown) being arranged between inlet valve 1 and ultrafilter membrane 2，High-pressure pump 4，The reverse osmosis membrane 5 being connected with high-pressure pump 4 port of export，Proportioning valve 7，The post active carbon 8 being connected with proportioning valve 7 port of export，The 2nd TDS sensor 9 being connected with post active carbon 8 port of export，For storing the pressure vessel 12 purifying water，Connect ultrafilter membrane 2 and the ultrafilter membrane late gate 3 of high-pressure pump 4 arrival end，It is arranged on the reverse osmosis membrane late gate 6 between reverse osmosis membrane 5 port of export and an arrival end of proportioning valve 7，It is arranged on check-valves 11 before the tank between the 2nd TDS sensor 9 and pressure vessel 12 arrival end，It is arranged on the flowing water Valve 13 of pressure vessel 12 water side，The by-pass valve 14 being connected between ultrafilter membrane 2 with proportioning valve 7 and with ultrafilter membrane late gate 3 arrival end，Connect the flushing valve 15 of pressure vessel 12 and ultrafilter membrane 2，First and second waste water valves 16 and 17 of ultrafilter membrane，The three wastes penstock 18 of reverse osmosis membrane 5，The detection part (Fig. 1 is not shown) of the transmembrane pressure of detection ultrafilter membrane 2，With the control device controlling the work of this household water filter.
Fig. 2 shows the structural representation of control part according to an embodiment of the invention.In Fig. 2, controlled valve refers to the inlet valve in Fig. 1, ultrafilter membrane late gate, reverse osmosis membrane late gate, check-valves before tank, flowing water Valve, by-pass valve, flushing valve, and first to three wastes penstock.As in figure 2 it is shown, the transmembrane pressure of detection is sent to control device by detection part, a TDS value and the 2nd TDS value of detection are sent to control device by a TDS sensor and the 2nd TDS sensor respectively.Control to arrange intervalometer inside device, be used for carrying out timing.Intervalometer can realize with software approach.As selection, it is also possible to the intervalometer of one hardware of configuration.
Control device to be compared with threshold pressure differential by the transmembrane pressure of reception.When transmembrane pressure is more than threshold pressure differential, controls device and make household water filter be in cleaning model；When transmembrane pressure is less than or equal to threshold pressure differential, controls device and make household water filter be in controlling the water circulation pattern.
In a cleaning mode, control the TDS value that detect according to a TDS sensor of device and the 2nd TDS value that the 2nd TDS sensor detects and a default TDS standard value and the 2nd TDS threshold value determine scavenging period t, to inlet valve 1, reverse osmosis membrane late gate 6, proportioning valve 7, by-pass valve 14, flushing valve 15 and first to three wastes penstock 16,17 and 18 switching signals that each valve is provided, and rinse ultrafilter membrane 2 and reverse osmosis membrane 5 according to the scavenging period determined.Specifically, when transmembrane pressure is more than threshold pressure differential, controls device and first determine scavenging period t.According to embodiments of the invention, scavenging period t can be identified below:
β=(TDS1-TDSstandard)/TDSstandard
In formula, TDS1 is a TDS value, TDSstandardBeing a TDS standard value, Δ p is the transmembrane pressure of detection, Δ peFor threshold pressure differential, t0For the standard cleaning time, t is scavenging period.According to embodiments of the invention, scavenging period is affected by two factors.One is the water quality of tap water, represents with a TDS value, and a TDS value is generally larger than the TDS standard value preset；Two is the transmembrane pressure of ultrafilter membrane.If water quality is the poorest, then the time causing transmembrane pressure degradation is the fastest, and a TDS value is the biggest, and corresponding β value is the biggest.If a TDS value is equal with a TDS standard value, i.e. tap water is standard water quality, now e-βValue is 1, then the determination of above-mentioned scavenging period t is only affected by transmembrane pressure.Transmembrane pressure is the biggest, illustrates that ultrafilter membrane is blocked the most serious, and filter effect is worse.Now, it is a need for according to transmembrane pressure proper extension scavenging period.But, transition extends scavenging period, can cause again the waste of the resource such as water, electricity.Therefore, the beta coefficient relevant to water quality is used to regulate scavenging period further.According to above-mentioned formula, the present invention can arrange the time being carried out filter membrane accurately, in the case of ensureing cleaning performance, saves water further.In the present invention, standard cleaning time t0It it is 5～10 seconds.It is preferred that the threshold pressure differential of cross-film may be set to 2～3 meters, or it is 20-30kPa.
Afterwards, control device and send shutdown signal to flushing valve 15 and the first waste water valve 16, send to inlet valve 1, ultrafilter membrane late gate 3, flowing water Valve 13, by-pass valve 14 and the second waste water valve 17 and open signal, intervalometer starts timing, make the purification water in pressure vessel 12 flow through flushing valve 15 and flow through ultrafilter membrane 2, flow out at wastewater outlet through the first waste water valve 16 again, so that ultrafilter membrane 2 is carried out the time backwash as t.In the present invention, use the purification water in pressure vessel that ultrafilter membrane 2 is carried out backwash, owing to purifying water than tap water " totally " much, i.e. few a lot of impurity, it is thus possible to preferably protect filter membrane, extend the service life of filter membrane.
As the intervalometer timing t time of advent, i.e. at the end of the backwash to ultrafilter membrane 2, intervalometer restarts timing, control device and send unlatching signal to inlet valve 1 and the second waste water valve 17, send shutdown signal to ultrafilter membrane late gate 3, by-pass valve 14, flushing valve 15 and the first waste water valve 16 simultaneously, make tap water flow through ultrafilter membrane 2 through inlet valve 1, then flow out at wastewater outlet through the second waste water valve 17, ultrafilter membrane 2 to be carried out the time suitable flushing as t.
Next, as the intervalometer timing t time of advent, i.e. at the end of the suitable flushing to ultrafilter membrane 2, intervalometer restarts timing again, control device to inlet valve 1, by-pass valve 3 and three wastes penstock 18 send opens signal, simultaneously to permeable membrane late gate 6, by-pass valve 14, flushing valve 15, first waste water valve 16 and the second waste water valve 17 send shutdown signal, make tap water through inlet valve 1, ultrafilter membrane 2, ultrafilter membrane late gate 3 flows through reverse osmosis membrane 5, flow out at wastewater outlet through three wastes penstock 18 again, reverse osmosis membrane 5 to be carried out the time suitable flushing as t.
Afterwards, as the intervalometer timing t time of advent, control device, at the end of the suitable flushing to reverse osmosis membrane 5, makes household water filter return to controlling the water circulation pattern.
Under controlling the water circulation pattern, control device to inlet valve 1, reverse osmosis membrane late gate 6, proportioning valve 7, by-pass valve 14, flushing valve 15 and first to three wastes penstock 16,17 and 18 switching signals that each valve is provided, and control the proportioning valve 7 TDS value purifying water with regulation post active carbon 8 according to the 2nd TDS value.Specifically, control device and send unlatching signal to inlet valve 1, ultrafilter membrane late gate 3, reverse osmosis membrane late gate 6 and by-pass valve 14, send shutdown signal to flushing valve the 15, first wastewater effluent valve the 16, second wastewater effluent valve 17 and the 3rd waste water flowing water Valve 18, make tap water flow through ultrafilter membrane 2 and produce ultrafiltration water.The ultrafiltration water of ultrafilter membrane 2 is controlled a part by proportioning valve 7 and flows through reverse osmosis membrane 5 and produce reverse osmosis water, and another part flows through proportioning valve 7 through by-pass valve 14 and mixes with the reverse osmosis water of reverse osmosis membrane 5, and mixed water flows through post active carbon 8 and produces and purify water.Purify water check-valves feed pressure storage tank 12 before tank.When flowing water Valve 13 receives unlatching signal from control device, purifying water can flow out through flowing water Valve 13.
Under controlling the water circulation pattern, when controlling device and determining the 2nd TDS value more than predetermined 2nd TDS threshold value, controlling device and send control signal to proportioning valve 7 and make to flow through the ultrafiltration discharge of proportioning valve and diminish, the reverse osmosis water flow flowed out from reverse osmosis membrane becomes greatly；When determining that the 2nd TDS value is less than or equal to the 2nd predetermined TDS threshold value, control device sends control signal to proportioning valve 7 and makes to flow through the ultrafiltration current quantitative change of proportioning valve greatly, and the reverse osmosis water flow flowed out from reverse osmosis membrane diminishes.According to embodiments of the invention, the 2nd TDS value is maintained 250～500mg/L, it is ensured that water outlet contains appropriate mineral.As selection, it is also possible to according to the 2nd TDS value, the adjustment mode of proportioning valve is with regulation ultrafiltration water and the mixed proportion of reverse osmosis water to use look-up table to determine.Using under the mode of look-up table, it is internal that described look-up table is predefined and stored in controlling device.
It is preferred that after being adjusted if, with proportioning valve 7, still cannot ensure that the 2nd TDS value is maintained 250～500mg/L, the 2nd TDS value can be ensured further with mineral filter element 10.As shown in Figure 1, it is shown that comprise the household water filter structural representation of mineral filter element 10.It will be appreciated by those skilled in the art that mineral filter element 10 not necessarily.And, it is alternatively that, can be the water route of check-valves 11, arranging the 4th valve and the 5th valve (not shown) before the 2nd TDS sensor 9 to tank shown in Fig. 1.4th valve is directly connected to check-valves 11 before the 2nd TDS sensor and tank, and the 5th valve is arranged between the 2nd TDS sensor and mineral filter element 10, and mineral filter element 10 is connected with check-valves before tank 11.When need not use mineral filter element 10, controlling device and sending shutdown signal to the 5th valve, send to the 4th valve and open signal, make water cannot flow into mineral filter element 10 by the 5th valve；When needs use mineral filter element 10, control device and send unlatching signal to the 5th valve, send shutdown signal to the 4th valve, make water cannot flow through the 4th valve and flow through mineral filter element 10.
Fig. 3 shows the flow chart of the method for the automatic cleaning filter membranes of household water filter according to embodiments of the present invention.
As it is shown in figure 1, in step 302, received the transmembrane pressure that detection part detects, a TDS sensor and the 2nd TDS sensor the TDS value detected respectively and the 2nd TDS value by controlling parts.
In step 304, control device and described transmembrane pressure is compared with threshold pressure differential, and determine that whether transmembrane pressure is more than threshold pressure differential.
When determining that transmembrane pressure is more than threshold pressure differential, control device and make household water filter be in cleaning model (step 306).Specifically, the TDS value detected according to a TDS sensor and the 2nd TDS value of the 2nd TDS sensor detection and a TDS standard value and the 2nd TDS threshold value preset determine scavenging period t, control device and provide the switching signal of each valve to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first to three wastes penstock, to rinse ultrafilter membrane and reverse osmosis membrane according to the scavenging period determined.
Specifically, when transmembrane pressure is more than threshold pressure differential, controls device and first determine scavenging period t.Control to arrange intervalometer inside device.Intervalometer can realize with software approach.As selection, it is also possible to the intervalometer of one hardware of configuration.Scavenging period is determined by following formula:
β=(TDS1-TDSstandard)/TDSstandard
In formula, TDS1 is a TDS value, TDSstandardBeing a TDS standard value, Δ p is the transmembrane pressure of detection, Δ peFor threshold pressure differential, t0For the standard cleaning time, t is scavenging period.
Afterwards, control device and send shutdown signal to flushing valve 15 and the first waste water valve 16, send to inlet valve 1, ultrafilter membrane late gate 3, flowing water Valve 13, by-pass valve 14 and the second waste water valve 17 and open signal, intervalometer starts timing, make the purification water in pressure vessel flow through flushing valve 15 and flow through ultrafilter membrane 2, flow out at wastewater outlet through the first waste water valve 16 again, so that ultrafilter membrane 2 is carried out the time backwash as t.
As the intervalometer timing t time of advent, i.e. at the end of the backwash to ultrafilter membrane 2, intervalometer restarts timing, control device and send unlatching signal to inlet valve 1 and the second waste water valve 17, send shutdown signal to ultrafilter membrane late gate 3, by-pass valve 14, flushing valve 15 and the first waste water valve 16 simultaneously, make tap water flow through ultrafilter membrane 2 through inlet valve 1, then flow out at wastewater outlet through the second waste water valve 17, ultrafilter membrane 2 to be carried out the time suitable flushing as t.
Next, as the intervalometer timing t time of advent, i.e. at the end of the suitable flushing to ultrafilter membrane 2, intervalometer restarts timing again, control device to inlet valve 1, by-pass valve 3 and three wastes penstock 18 send opens signal, simultaneously to permeable membrane late gate 6, by-pass valve 14, flushing valve 15, first waste water valve 16 and the second waste water valve 17 send shutdown signal, make tap water through inlet valve 1, ultrafilter membrane 2, ultrafilter membrane late gate 3 flows through reverse osmosis membrane 5, flow out at wastewater outlet through three wastes penstock 18 again, reverse osmosis membrane 5 to be carried out the time suitable flushing as t.
Afterwards, as the intervalometer timing t time of advent, control device, at the end of the suitable flushing to reverse osmosis membrane 5, makes household water filter return to controlling the water circulation pattern.
When transmembrane pressure is less than or equal to threshold pressure differential, controls device and make household water filter be in controlling the water circulation pattern (step 308).Specifically, under controlling the water circulation pattern, described control device provides the switching signal of each valve to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first to three wastes penstock, to control, according to the 2nd TDS value, the TDS value that proportioning valve regulates the purification water of post active carbon.
In the present invention, control device and automatically clean ultrafilter membrane and reverse osmosis membrane owing to have employed according to the change of the change of the transmembrane pressure of ultrafilter membrane and water quality from the beginning, it is possible to extend the service life of filter membrane, reduce the use cost of household water filter.Further, due to can be according to transmembrane pressure and predetermined threshold, and a TDS value of tap water and a TDS standard value dynamically adjust the time of cleaning filter membranes, can improve the efficiency of cleaning filter membranes further and reduce the consumption to the resource such as water, electricity.Additionally, control the TDS value purifying water that device can detect according to the 2nd TDS sensor, regulate proportioning valve thus adjust the TDS value purifying water, it is provided that purify the quality of water.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
- null1. the household water filter of an automatic cleaning filter membranes，It is characterized in that including inlet valve (1)，Ultrafilter membrane (2)，It is arranged on the TDS sensor between inlet valve (1) and ultrafilter membrane (2)，High-pressure pump (4)，The reverse osmosis membrane (5) being connected with high-pressure pump (4) port of export，Proportioning valve (7)，The post active carbon (8) being connected with proportioning valve (7) port of export，The 2nd TDS sensor (9) being connected with post active carbon (8) port of export，Pressure vessel (12)，Connect ultrafilter membrane (2) and the ultrafilter membrane late gate (3) of high-pressure pump (4) arrival end，The reverse osmosis membrane late gate (6) being arranged between reverse osmosis membrane (5) port of export and an arrival end of proportioning valve (7)，It is arranged on check-valves (11) before the tank between the 2nd TDS sensor (9) and pressure vessel (12) arrival end，It is arranged on the flowing water Valve (13) of pressure vessel (12) water side，The by-pass valve (14) being positioned between ultrafilter membrane (2) with proportioning valve (7) and be connected with ultrafilter membrane late gate (3) arrival end，Connect the flushing valve (15) of pressure vessel (12) and ultrafilter membrane (2)，First and second waste water valves (16 of ultrafilter membrane、17)，The three wastes penstock (18) of reverse osmosis membrane (5)，The detection part of the transmembrane pressure of detection ultrafilter membrane (2)，With the control device controlling the work of this household water filter；The transmembrane pressure of detection is sent to control device by detection part, and a TDS value and the 2nd TDS value of detection are sent to control device by a TDS sensor and the 2nd TDS sensor respectively；Control device to be compared with threshold pressure differential by described transmembrane pressure, make household water filter be in cleaning model when transmembrane pressure is more than threshold pressure differential, otherwise make household water filter be in controlling the water circulation pattern；In a cleaning mode, control the TDS value that detect according to a TDS sensor of device and the 2nd TDS value that the 2nd TDS sensor detects and a default TDS standard value and the 2nd TDS threshold value determine scavenging period t, to inlet valve (1), reverse osmosis membrane late gate (6), proportioning valve (7), by-pass valve (14), flushing valve (15) and first to three wastes penstock (16,17,18) switching signal of each valve is provided, and rinses ultrafilter membrane (2) and reverse osmosis membrane (5) according to the scavenging period determined；Under controlling the water circulation pattern, described control device to inlet valve (1), reverse osmosis membrane late gate (6), proportioning valve (7), by-pass valve (14), flushing valve (15) and first to three wastes penstock (16,17,18) switching signal of each valve is provided, and controls proportioning valve (7) to regulate the TDS value purifying water of post active carbon (8) according to the 2nd TDS value；Wherein, described scavenging period is determined by following formula:β=(TDS1-TDSstandard)/TDSstandardIn formula, TDS1 is a TDS value, TDSstandardBeing a TDS standard value, Δ p is the transmembrane pressure of detection, Δ peFor threshold pressure differential, t0For the standard cleaning time, t is scavenging period.
- Household water filter the most according to claim 1, wherein, to inlet valve (1), reverse osmosis membrane late gate (6), proportioning valve (7), by-pass valve (14), flushing valve (15) and first to three wastes penstock (16,17,18) switching signal of each valve is provided, and is rinsed including to ultrafilter membrane (2) and reverse osmosis membrane (5) according to the scavenging period determined:Control device and send shutdown signal to flushing valve (15) and the first waste water valve (16), send to inlet valve (1), ultrafilter membrane late gate (3), flowing water Valve (13), by-pass valve (14) and the second waste water valve (17) and open signal, make the purification water in pressure vessel flow through flushing valve (15) and flow through ultrafilter membrane (2), flow out at wastewater outlet through the first waste water valve (16) again, so that ultrafilter membrane (2) is carried out the time backwash as t；Control device at the end of the backwash to ultrafilter membrane (2), send to inlet valve (1) and the second waste water valve (17) and open signal, send shutdown signal to ultrafilter membrane late gate (3), by-pass valve (14), flushing valve (15) and the first waste water valve (16) simultaneously, tap water is made to flow through ultrafilter membrane (2) through inlet valve (1), flow out at wastewater outlet through the second waste water valve (17) again, ultrafilter membrane (2) to be carried out the time suitable flushing as t；Control device at the end of the suitable flushing to ultrafilter membrane (2), to inlet valve (1), by-pass valve (3) and three wastes penstock (18) send opens signal, simultaneously to permeable membrane late gate (6), by-pass valve (14), flushing valve (15), first waste water valve (16) and the second waste water valve (17) send shutdown signal, make tap water through inlet valve (1), ultrafilter membrane (2), ultrafilter membrane late gate (3) flows through reverse osmosis membrane (5), flow out at wastewater outlet through three wastes penstock (18) again, reverse osmosis membrane (5) to be carried out the time suitable flushing as t；Described control device, at the end of the suitable flushing to reverse osmosis membrane (5), makes household water filter return to controlling the water circulation pattern.
- Household water filter the most according to claim 2, wherein, under controlling the water circulation pattern, control device to inlet valve (1), reverse osmosis membrane late gate (6), proportioning valve (7), by-pass valve (14), flushing valve and first to three wastes penstock (16,17,18) switching signal providing each valve includes:Control device and send unlatching signal to inlet valve (1), ultrafilter membrane late gate (3), reverse osmosis membrane late gate (6) and by-pass valve (14), send shutdown signal to flushing valve (15), the first wastewater effluent valve (16), the second wastewater effluent valve (17) and the 3rd waste water flowing water Valve (18), make tap water flow through ultrafilter membrane (2) and produce ultrafiltration water；The ultrafiltration water of ultrafilter membrane (2) is controlled a part by proportioning valve (7) and flows through reverse osmosis membrane (5) generation reverse osmosis water, another part flows through proportioning valve (7) through by-pass valve (14) and mixes with the reverse osmosis water of reverse osmosis membrane (5), and mixed water flows through post active carbon (8).
- Household water filter the most according to claim 3, wherein, when the 2nd TDS value is more than the 2nd predetermined TDS threshold value, controlling device and to proportioning valve transmission control signal, the infiltration discharge flowing through proportioning valve is diminished, the reverse osmosis water flow flowed out from reverse osmosis membrane becomes greatly；When the 2nd TDS value is less than or equal to the 2nd predetermined TDS threshold value, controlling device and make to flow through the infiltration current quantitative change of proportioning valve greatly to proportioning valve transmission control signal, the reverse osmosis water flow flowed out from reverse osmosis membrane diminishes.
- Household water filter the most according to claim 1, wherein, standard cleaning time t0It it is 5～10 seconds.
- Household water filter the most according to claim 1, wherein, the 2nd TDS value is maintained 250～500mg/L.
- Household water filter the most according to claim 1, farther includes:Mineral filter element (10), is arranged between the 2nd TDS sensor and check-valves (11).
- 8. the method being used for the automatic cleaning filter membranes of household water filter, including:The transmembrane pressure that detection part detects, a TDS sensor and the 2nd TDS sensor the TDS value detected respectively and the 2nd TDS value is received by controlling parts；By controlling device, described transmembrane pressure is compared with threshold pressure differential；When transmembrane pressure is more than threshold pressure differential, controlling device makes household water filter be in cleaning model: the 2nd TDS value and a TDS standard value and the 2nd TDS threshold value preset that detect according to a TDS value and the 2nd TDS sensor of a TDS sensor detection determine scavenging period t, the switching signal of each valve is provided to three wastes penstock, to rinse ultrafilter membrane and reverse osmosis membrane according to the scavenging period determined to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first；When transmembrane pressure is less than or equal to threshold pressure differential, controlling device makes household water filter be in controlling the water circulation pattern: under controlling the water circulation pattern, described control device provides the switching signal of each valve to inlet valve, reverse osmosis membrane late gate, proportioning valve, by-pass valve, flushing valve and first to three wastes penstock, to control, according to the 2nd TDS value, the TDS value that proportioning valve regulates the purification water of post active carbon；nullWherein，Described household water filter includes inlet valve，Ultrafilter membrane，The TDS sensor being arranged between inlet valve and ultrafilter membrane，High-pressure pump，The reverse osmosis membrane being connected with high pressure pump outlet end，Proportioning valve，The post active carbon being connected with the proportioning valve port of export，The 2nd TDS sensor being connected with the post active carbon port of export，Pressure vessel，Connect ultrafilter membrane and the ultrafilter membrane late gate of high pressure pump inlet end，It is arranged on the reverse osmosis membrane late gate between the reverse osmosis membrane port of export and an arrival end of proportioning valve，It is arranged on check-valves before the tank between the 2nd TDS sensor and pressure vessel arrival end，It is arranged on the flowing water Valve of pressure vessel water side，The by-pass valve being connected between ultrafilter membrane with proportioning valve and with ultrafilter membrane late gate arrival end，Connect the flushing valve of pressure vessel and ultrafilter membrane，First and second waste water valves of ultrafilter membrane，The three wastes penstock of reverse osmosis membrane，The detection part of the transmembrane pressure of detection ultrafilter membrane，With the control device controlling the work of this household water filter；Wherein, described scavenging period is determined by following formula:β=(TDS1-TDSstandard)/TDSstandardIn formula, TDS1 is a TDS value, TDSstandardBeing a TDS standard value, Δ p is the transmembrane pressure of detection, Δ peFor threshold pressure differential, t0For the standard cleaning time, t is scavenging period.
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