CN218435311U - Maintenance-free pretreatment water purifying device, water purifier and hemodialysis system - Google Patents

Abstract

The application provides a non-maintaining preliminary treatment purifier, water purifier and hemodialysis system, includes: the multi-stage filter at least comprises a laminated filter, a multi-media filter and a folded membrane filter which are sequentially communicated in series; the pressure detection assembly at least comprises a first pressure sensor and a second pressure sensor which are respectively used for detecting the pressure between the input end and the output end of one or both of the multi-stage filters; the control assembly controls the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the pressure difference detected by the pressure detection assembly, or controls the maintenance-free pretreatment water purifying device to be in the filtering state and the non-filtering state according to a control program, and the control assembly can also control the water inlet rate of the water inlet pump according to the pressure detected by the first pressure sensor or the second pressure sensor.

Description

Maintenance-free pretreatment water purifying device, water purifier and hemodialysis system

Technical Field

The application relates to the technical field of water treatment, in particular to a maintenance-free pretreatment water purifying device, a water purifier and a hemodialysis system.

Background

In the field of medical water purification, in particular hemodialysis, reverse osmosis technology is mainly adopted for purification. Because the working characteristics of the reverse osmosis membrane per se, the pollutant stripping capacity is limited, about 99 percent, the reverse osmosis membrane is easy to oxidize and precipitate calcium, and is easy to pollute and block, the requirement is that the inlet water must reach enough cleanliness, and then the treated water is purified by a reverse osmosis device, so that the use standard is reached. In order to meet the requirements, a multi-media filter consisting of quartz sand, manganese sand and the like is required to be arranged to remove suspended matters, colloids and iron ions, then the water is filtered by activated carbon to remove residual chlorine, disinfectants, strong oxidants, pigments and the like, then the water is filtered by anion resin to reduce the hardness of the water, and finally the crushed resin and other residues are required to be blocked by a polypropylene melt-blown filter to prevent the crushed resin and other residues from entering a reverse osmosis membrane runner.

The process is adopted to carry out early-stage water purification, frequent backwashing, manual salt adding softening regeneration and weekly replacement of the melt-blown core are required. High requirements are put forward for maintenance personnel, salt is added periodically, hardness is detected every day, and the filter element is required to be replaced after frequent shutdown. Abandonment of the replaced filter element and the discharged softened brine cause cost burden, great waste and environmental impact to a certain extent.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide a non-maintaining preliminary treatment purifier, water purifier and hemodialysis system to reduce the use of artifical change consumptive material, the frequency of artifical detection quality of water, cancellation demineralization salt, practice thrift the cost. The specific technical scheme is as follows:

the first aspect of the embodiment of this application provides a non-maintaining preliminary treatment purifier, includes: the water inlet pump, the multistage filter, the booster pump and the membrane filter are sequentially communicated in series, the water inlet end of the water inlet pump is communicated with a water source, the water outlet end of the membrane filter is used for outputting softened purified water, and the multistage filter at least comprises a laminated filter, a multi-media filter and a folded membrane filter which are sequentially communicated in series;

a pressure detection assembly including at least a first pressure sensor and a second pressure sensor for detecting pressure between an input and an output of one or both of the multi-stage filters, respectively;

the control assembly is used for controlling the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the pressure difference detected by the pressure detection assembly, or controlling the maintenance-free pretreatment water purifying device to be in the filtering state and the non-filtering state according to a control program, and the control assembly is also used for controlling the water inlet rate of the water inlet pump according to the pressure detected by the first pressure sensor or the second pressure sensor.

According to the maintenance-free and maintenance-free pretreatment water purifying device in the embodiment of the application, inlet water firstly enters the laminated filter along the first direction through the inlet valve port and the outlet valve port of the three-way valve. The core technology of the laminated filter lies in that the laminated filter is composed of a group of hollow laminated sheets with grooves in different directions on two sides, two adjacent laminated sheets are stacked, the edges of the grooves on the adjacent surfaces of the two laminated sheets form a plurality of cross points, the cross points form a large number of cavities and irregular passages, and the passages are continuously shrunk from outside to inside. These passages cause turbulence in the water during filtration, eventually causing impurities in the water to be trapped at the various intersections. The multiple laminated sheets are stacked and installed on the filter element framework, and are stacked and pressed by the pressing spring, and the filter unit with the outer side loose and the inner side tight is formed under the pressure of the spring and the incoming water. The preferred nylon material of lamination, the nylon material has sufficient intensity and hydrophilicity, hydroenergy smoothly passes through when guaranteeing the pressurized. The laminated filter is used for removing larger particles in water, generally more than 50 μm, such as silt, rust, microorganism, suspended matter, colloid and other impurities. Then passes through a composite multi-media filter, and the multi-media filter can filter out disinfectant, oxidant and heavy metal. The folded membrane filter has a large number of folded and compressed folds, has the advantages of large surface area, high hysteresis quantity, high flux, low resistance and the like, and can accommodate a large number of suspended matters. The booster pump can pressurize the water prior to entering the membrane filter, thereby increasing the flow of water into the membrane filter. The membrane filter can effectively remove harmful substances such as bacteria, organic pollutants, heavy metals and the like, selectively retains mineral elements such as potassium and the like required by a human body, and retains trace ions which can be used for reverse osmosis of inlet water, so that the purified water meets related standards.

The pressure sensing assembly may include at least a first pressure sensor and a second pressure sensor, and may be disposed at an input and an output of one or more of the laminate filter, the multimedia filter, and the pleated membrane filter. In order to better reflect the current water quality of the maintenance-free pre-processing water purifying device, the pressure detection components are generally arranged at the input end and the output end of the folded membrane filter, the pressure value of the first pressure sensor can reflect the service condition of the laminated filter and the multi-media filter, and the pressure difference value between the first pressure sensor and the second pressure sensor can reflect the service condition of the folded membrane filter. When the pressure difference detected by the first pressure sensor and the second pressure sensor of the pressure detection assembly exceeds a certain range, for example, when the pressure difference exceeds 0.03-0.07 MPa, the maintenance-free pretreatment water purifying device can be closed, the filter element of the laminated membrane filter can be replaced, and then the back washing of the laminated filter and the multi-media filter can be started, so that the laminated filter and the multi-media filter are in a back washing state. The back flushing of the laminated filter and the multi-media filter can also be performed according to the program setting, and the back flushing can be performed separately. Furthermore, a third pressure sensor and a fourth pressure sensor can be arranged between the water inlet pump and the lamination filter and between the lamination filter and the multi-medium filter, so that the service condition of each stage of filter can be dynamically monitored, a back washing program or a filter element replacing program can be started in time, and the maintenance-free pretreatment water purifying device is always in a good working state.

The control assembly can control the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the pressure difference detected by the pressure detection assembly, wherein the non-filtering state comprises a shutdown state and a back flushing state. In addition, the control component can also judge the water flow speed according to the pressure value detected by the first pressure sensor or the second pressure sensor, so as to adjust the water inlet speed of the water inlet pump.

Through the cooperation use of multistage filter, membrane filter, pressure measurement subassembly and control assembly, non-maintaining preliminary treatment purifier can carry out the back flush to lamination filter, multi-media filter automatically, practices thrift manpower, material resources, and the dynamic monitoring multistage filter's of being convenient for service behavior moreover guarantees the quality of water after filtering. In addition, the membrane filter is used for softening water, so that the use of softening salt is avoided, the resource waste can be reduced, and the cost is further saved.

In addition, according to the non-maintaining preliminary treatment purifier of this application embodiment, can also have following additional technical characterstic:

according to some embodiments of the present application, the maintenance-free pre-processed water purification apparatus further comprises a conductivity detection assembly, the conductivity detection assembly comprising at least a first conductivity detector for detecting conductivity at an output of the multimedia filter or the pleated membrane filter; the control component is also used for controlling the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the conductivity detected by the conductivity monitoring component.

According to some embodiments of the present application, the laminated filter comprises a first backwashing pipeline communicated with each other, a three-way valve is arranged at a water inlet end of the laminated filter, the three-way valve comprises a bypass valve port, a water inlet valve port and a water outlet valve port, and a first throttle valve is arranged between the laminated filter and the multimedia filter; when the filter is in the filtering state, the water inlet valve port is communicated with the water outlet valve port, the first throttle valve is opened, and water of the water inlet pump enters the multi-media filter through the laminated filter along a first direction for secondary filtering; when the water inlet pump is in the non-filtering state, the water inlet valve port and the bypass valve port are communicated, the first throttle valve is closed, and water of the water inlet pump passes through the laminated filter along the direction opposite to the first direction and is discharged through the first backwashing pipeline.

According to some embodiments of the application, the multi-stage filter comprises a plurality of multi-media filters connected in parallel, each multi-media filter comprises a multi-path switching control valve and a second backwashing pipeline communicated with the multi-path switching control valve, a one-way valve is arranged at the output end of each multi-media filter, a first throttle valve is arranged between each laminated filter and each multi-media filter, the first throttle valves and the multi-media filters are arranged in a one-to-one correspondence mode, the control assembly can control the conduction states of the multi-path switching control valves respectively, so that the multi-media filters are in the filtering state and/or the non-filtering state respectively, and the whole system can be guaranteed to supply purified water continuously.

According to some embodiments of the present application, the membrane filter includes a softened pure water output line for outputting softened pure water and a hardened wastewater output line for outputting hardened wastewater, the hardened wastewater output line includes a main line and a bypass, the bypass includes a first throttle valve, and an intermittent opening of the first throttle valve controls the bypass to be intermittently opened to accelerate discharge of contaminants on a surface of the membrane filter.

According to some embodiments of the present application, the pleated membrane filter includes a pleated membrane cartridge that is an integrally formed structure formed by a tubular polypropylene film folded and compressed.

According to some embodiments of the present application, the filter media of the multi-media filter is activated carbon, zinc particles, and magnesium particles.

According to some embodiments of the present application, the volume of the filter media comprises 60% -75% of the volume of the multimedia filter; the volume ratio of the activated carbon to the zinc particles to the magnesium particles is 4.

The second aspect of the present application provides a water purifier, which comprises the maintenance-free pretreatment water purification device described above.

A third aspect of the present application provides a hemodialysis system comprising the maintenance-free pre-treatment water purification device described above.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic structural diagram of a maintenance-free pre-processing water purifying device provided in an embodiment of the present application;

fig. 2 is a schematic view of a manufacturing process of a folded membrane cartridge according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative term is intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "in 8230 \8230; below" may include both upper and lower orientations. The device may be otherwise oriented, such as rotated 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, the embodiment of the present application provides a maintenance-free pre-treatment water purification device, which can be used in hemodialysis systems with extremely high requirements for purified water, and can also be used in other occasions with high requirements for purified water, including but not limited to pharmaceutical plants, food processing plants, biochemical plants, and so on.

As shown in fig. 1, the maintenance-free pretreatment water purifying apparatus includes: the water inlet pump 1, the multi-stage filter, the booster pump 5, the membrane filter 6, the pressure detection assembly and the control assembly (not shown in the figure) are sequentially communicated in series, the water inlet end of the water inlet pump 1 is communicated with a water source, the water outlet end of the membrane filter 6 is used for outputting softened purified water, and the multi-stage filter comprises a laminated filter 2, a multi-media filter 3 and a folded membrane filter 4 which are sequentially communicated in series. The pressure sensing assembly includes at least a first pressure sensor PT01 and a second pressure sensor PT02, the first pressure sensor PT01 and the second pressure sensor PT02 being for sensing pressure between the input and the output of one or both of the multi-stage filters, respectively. The control assembly is used for controlling the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the pressure difference detected by the pressure detection assembly, or controlling the maintenance-free pretreatment water purifying device to be in the filtering state and the non-filtering state according to a control program, and the control assembly is also used for controlling the water inlet rate of the water inlet pump 1 according to the pressure detected by the first pressure sensor PT01 or the second pressure sensor PT 02.

Referring to fig. 1, the direction indicated by the arrow in the figure is the water flow direction during normal filtration in the maintenance-free pretreatment water purification device. According to the maintenance-free pre-treated water purification device in the embodiment of the present application, the inlet water first enters the laminated filter 2 through the three-way valve 11 in a first direction (i.e., the water flow direction in the figure). The core technology of the laminated filter 2 is that the laminated filter is composed of a group of laminations which are provided with grooves in different directions on two sides and are hollow inside, two adjacent laminations are stacked, the edges of the grooves on the adjacent surfaces of the laminations form a plurality of cross points, the cross points form a large number of cavities and irregular passages, and the passages are continuously reduced from outside to inside. These passages cause turbulence in the water during filtration, eventually causing impurities in the water to be trapped at the various intersections. The filter element is characterized in that a plurality of laminated sheets are stacked and arranged on the filter element framework, the laminated sheets are stacked and pressed by the pressing spring, and the filter element with the loose outside and the tight inside is formed under the pressure of the spring and the incoming water. The lamination is preferably made of nylon, and the nylon has sufficient strength and hydrophilicity, so that water can smoothly pass through the lamination when being pressed. The laminated filter 2 is used for removing larger particles, typically over 50 μm, such as silt, rust, microorganisms, suspended matter, colloids, etc., from water. Then passes through the multi-media filter 3, and the multi-media filter 3 can filter out disinfectants, oxidants and heavy metals. . The folded membrane filter 4 has a large number of folded and compressed folds, has the advantages of large surface area, high hysteresis quantity, high flux, low resistance and the like, and can accommodate a large number of suspended matters. The booster pump 5 is capable of pressurizing the water before entering the membrane filter 6, thereby increasing the flow of water into the membrane filter 6. The membrane filter 6 may be a polyamide membrane filter 6 or a polysulfone membrane filter 6, and the polyamide membrane filter 6 generally includes a nanofiltration membrane filter and an ultra-low pressure reverse osmosis membrane filter according to different filtering results. The membrane filter 6 can adopt but not limited to a nanofiltration membrane filter and an ultra-low pressure reverse osmosis membrane filter. The embodiment of the present application is described by taking the membrane filter 6 as a sheet-shaped roll-type loose polyamide filter membrane as an example, which is used for intercepting all ions with a diameter of 0.2 nm to 1 nm except for water, and is a membrane separation technology for intercepting nano-sized particles with a particle size in water between reverse osmosis and ultrafiltration. The membrane filter 6 allows ions between 0.2 and 1 nanometer to be partially separated and removed and partially retained so as to realize lower power consumption and more water production, and the looser polyamide membrane can effectively remove harmful substances such as bacteria, organic pollutants, heavy metals and the like, selectively retain mineral elements such as potassium and the like required by a human body, and retain trace ions capable of being used for reverse osmosis inflow water, so that the purified water meets relevant standards. .

The pressure sensing assembly, which may be disposed at the input and output of one or more of the laminated filter 2, the multimedia filter 3 and the pleated membrane filter 4, includes at least a first pressure sensor PT01 and a second pressure sensor PT 02. In order to better reflect the current water quality of the maintenance-free pre-processing water purifying device, pressure detection assemblies are generally arranged at the input end and the output end of the folded membrane filter 4, the pressure value of the first pressure sensor PT01 can reflect the use condition of the laminated filter 2 and the multi-media filter 3, and the pressure difference value between the first pressure sensor PT01 and the second pressure sensor PT02 can reflect the use condition of the folded membrane filter 4. When the pressure difference detected by the first pressure sensor PT01 and the second pressure sensor PT02 of the pressure detection assembly exceeds a certain range, for example, when the pressure difference exceeds 0.03-0.07 MPa, the maintenance-free pretreatment water purification device can be closed, the filter element of the laminated membrane filter 4 can be replaced, and then the back washing of the laminated filter 2 and the multi-media filter 3 can be started, so that the laminated filter 2 and the multi-media filter 3 are in a back washing state. The backwashing of the laminated filter 2 and the multimedia filter 3 may also be performed according to a program setting, and both may be performed separately. Furthermore, a third pressure sensor (not shown in the figure) and a fourth pressure sensor (not shown in the figure) can be arranged between the water inlet pump 1 and the laminated filter 2 and between the laminated filter 2 and the multi-medium filter 3, so that the service condition of each stage of filter can be dynamically monitored, and a back washing program or a filter element replacing program can be started in time, so that the maintenance-free pre-treatment water purifying device is always in a good working state.

The control assembly can control the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the pressure difference detected by the pressure detection assembly, wherein the non-filtering state comprises a shutdown state and a backwashing state. In addition, the control component can also judge the water flow speed according to the pressure value detected by the first pressure sensor PT01 or the second pressure sensor PT02, thereby adjusting the water inlet speed of the water inlet pump 1.

Through the cooperation use of multi-stage filter, membrane filter 6, pressure measurement subassembly and control assembly, non-maintaining preliminary treatment purifier can carry out the back flush to lamination filter 2, multi-media filter 3 automatically, practices thrift manpower, material resources, is convenient for in addition the dynamic monitoring multi-stage filter's in service behavior, guarantees the quality of water after the filtration. In addition, the membrane filter 6 is used for softening water, so that the use of softening salt is avoided, the resource waste can be reduced, and the cost is further saved.

In some embodiments, the filter media of the multi-media filter 3 are activated carbon, zinc particles, and magnesium particles.

The activated carbon in the multi-media filter 3 can remove pigment, peculiar smell and biochemical organic matters in water, reduce residual chlorine value of water, pesticide pollution and other pollutants harmful to human bodies. The multi-media filter 3 also comprises zinc particles and magnesium particles, and the two metals can form a galvanic cell reaction to carry out instant reduction and quickly remove chlorine in water. Meanwhile, the zinc particles can displace iron ions and manganese ions in water under the action of potential difference, so that the heavy metal in the water is prevented from exceeding the standard.

More specifically, the volume of the filter media is 60% -75% of the volume of the multimedia filter 3; such as 60%, 65%, 70%, 75%, etc. of the volume of the filter media of the multimedia filter 3. If the volume of the filter medium is too small, the area of the filter medium in contact with water is too small, resulting in poor filtration. If the volume of the filter medium is too large, the residual space of the multi-medium filter 3 is too small, and insufficient water enters the multi-medium filter 3 during backwashing, so that the scouring force on the filter medium is insufficient, and the backwashing effect is poor. Therefore, the volume of the filter medium accounts for 60-75% of the volume of the multi-medium filter 3, so that the metal precipitate can be effectively adsorbed, the adsorption capacity is strong, and the backwashing effect can be ensured.

The volume ratio of the filter medium activated carbon to the zinc particles to the magnesium particles is 4. The active carbon has a large volume ratio, can remove disinfectants, pigments and the like in water through physical adsorption, and removes residual chlorine, strong oxidants and the like in water by utilizing the strong reducibility of the active carbon. In order to avoid the overproof of total chlorine in the filtered water and the galvanic cell reaction formed between the zinc particles and the magnesium particles, chlorine can be rapidly removed, and the zinc particles can replace iron ions and manganese ions in the water under the action of potential difference, so that the overproof of heavy metals in the water is prevented. In addition, the trace zinc ions in the inlet water can be filtered by the subsequent membrane filter 6, the concentration of the zinc ions is far lower than the water limit value for dialysis treatment, and meanwhile, because the dialysis patients are generally lack of zinc, the trace zinc ions have benefits for users. Secondly, because magnesium can react with water extremely slowly, the PH value of the water source is neutral or alkaline, and the problem that the PH value of the produced water is reduced after the traditional reverse osmosis filtration is corrected.

Further, as shown in fig. 1, the maintenance-free pre-processing water purifying device further includes a conductivity detection assembly, the conductivity detection assembly at least includes a first conductivity detector CT01, and the first conductivity detector CT01 is used for detecting the conductivity at the output end of the multimedia filter 3 or the folded membrane filter 4; the control component is also used for controlling the maintenance-free pretreatment water purifying device to be in a filtering state and a non-filtering state according to the conductivity detected by the conductivity monitoring component.

The conductivity detection module may be disposed at the output of the multimedia filter 3 or the output of the pleated membrane filter 4. Since the multimedia filter 3 is a filter mainly removing impurity ions, the first conductivity detector CT01 is generally disposed at an output end of the multimedia filter 3. The conductivity detection component mainly reflects the condition of removing impurity ions by detecting the conductivity in water, so that the first conductivity detector CT01 is arranged at the output end of the folded membrane filter 4 and can also reflect the condition of removing impurity ions by the multimedia filter 3. The water quality entering the membrane filter 6 can meet the requirements by arranging the conductivity detection assembly, and the service life of the membrane filter 6 is prolonged. Of course, when the conductivity of the multi-media filter 3 does not meet the requirement, the backwashing process of the folded membrane filter 4 is started.

The control assembly is superposed with the judgment condition of the electric conductivity on the basis of the pressure difference judgment condition, and the maintenance-free pretreatment water purifying device is controlled to be in a filtering state and a non-filtering state by adopting a dual standard, so that the maintenance-free pretreatment water purifying device can be in a better working state.

It should be noted that, as shown in fig. 1, since the water temperature has a large influence on the operating state of the membrane filter 6, a temperature sensor TT01 is provided between the pleated membrane filter and the membrane filter 6, and the control unit adjusts the temperature of the water according to the detection result of the temperature sensor TT01, so that the membrane filter 6 is in an optimum operating state.

Referring to fig. 1, the laminated filter 2 further includes a first backwash pipeline 21 communicated with each other, a three-way valve 11 is disposed at a water inlet end of the laminated filter 2, the three-way valve 11 includes a bypass 62 valve port 11c, a water inlet valve port 11a and a water outlet valve port 11b, and a first throttle valve 7 is disposed between the laminated filter 2 and the multimedia filter 3. In a filtering state, the water inlet valve port 11a is communicated with the water outlet valve port 11b, the first throttle valve 7 is opened, and water of the water inlet pump 1 enters the multi-media filter 3 through the laminated filter 2 along a first direction for secondary filtering; in the non-filtering state, the water inlet valve port 11a and the valve port 11c of the bypass 62 are connected, and the water of the water inlet pump 1 passes through the laminated filter 2 in the direction opposite to the first direction and is discharged through the first backwashing pipeline 21.

The laminated filter 2 comprises a first backwashing pipeline 21, and a waste discharge and collection device 9 is arranged below the first backwashing pipeline 21 and used for collecting discharged waste water. The control assembly can automatically start a back washing program according to the detection result of the pressure assembly and/or the conductivity detection assembly or according to a preset working program to back wash the laminated filter 2 so as to ensure the filtering effect of the laminated filter 2 and prolong the service life of the laminated filter 2. When the laminated filter 2 is backwashed, the water inlet valve port 11a and the valve port 11c of the bypass 62 are communicated to change the water flow direction in the laminated filter 2, the spring on the filter element is pushed open by the water pressure, and all the laminated sheets and small pores among the laminated sheets are loosened. The nozzle in the center of the filter element sprays water along a tangent line, so that the lamination rotates, and solids trapped on the lamination are washed away under the flushing action of water flow and the centrifugal action of high-speed rotation of the lamination, so that a good cleaning effect can be achieved with little self-water consumption. The control assembly controls the water inlet valve port 11a and the water outlet valve port 11b to be communicated again, the water flow in the laminated filter 2 is reversed, the laminated sheet is compressed again by the spring force on the filter element, and the filtering state is recovered.

As shown in fig. 1, the multi-stage filter includes a plurality of multi-media filters 3 connected in parallel. The multi-media filters 3 are connected in parallel, so that the amount of filtered water is increased, and the water inlet amount of the next-stage filter is better satisfied.

In some embodiments, as shown in fig. 1, each multimedia filter 3 includes a multi-way switching control valve 31 and a second backwashing pipeline (not shown) communicated with the multi-way switching control valve 31, the output end of each multimedia filter 3 is provided with a one-way valve 8, a first throttle valve 7 is arranged between the laminated filter 2 and the multimedia filter 3, the first throttle valves 7 are arranged in one-to-one correspondence with the multimedia filters 3, and the control assembly can respectively control the conduction state of each multi-way switching control valve 31 so as to enable each of the multimedia filters 3 to be in a filtering state and/or a non-filtering state.

Each of the multimedia filters 3 includes a multi-switching control valve 31, and the control assembly can individually control each of the multimedia filters 3 to be in a filtering state or a non-filtering state by controlling the conduction state of the multi-switching control valve 31. Because the multi-media filters 3 are connected in parallel, when one or more multi-media filters 3 are in a non-filtering state, namely one or more multi-media filters 3 are in a back-flushing state, the rest multi-media filters 3 can be in a filtering state, so that the maintenance-free pretreatment water purifying device can still continue to filter, and the normal operation of the maintenance-free pretreatment water purifying device is not influenced. In order to prevent the plurality of multi-media filters 3 from influencing each other, a first throttle valve 7 is arranged between each multi-media filter 3 and the laminated filter 2, and the first throttle valve 7 can independently control the conduction of any one of the multi-media filters 3. Meanwhile, the output end of each multi-media filter 3 is also provided with a one-way valve 8, so that when one multi-media filter 3 is in a back flushing state, water flow is prevented from flowing back to other multi-media filters 3. The first throttle valve 7 may be a solenoid valve or a manual valve, and when the first throttle valve 7 is a solenoid valve, the control component may also control the opening and closing of the first throttle valve 7.

In some specific embodiments, as shown in fig. 1, the maintenance-free pre-processing water purifying apparatus further includes a fifth pressure sensor PT03, a second conductivity detector CT02 and a flow meter FT01, wherein the fifth pressure sensor PT03, the second conductivity detector CT02 and the flow meter FT01 are disposed at the output end of the membrane filter 6 to detect the water quality at the output end of the membrane filter 6 and the operation state of the maintenance-free pre-processing water purifying apparatus. By providing the fifth pressure sensor PT03 at the output of the membrane filter 6, the control module can determine the usage of the filtration membrane in the membrane filter 6 according to the pressure difference between the fifth pressure sensor PT03 and the second pressure sensor PT02, so as to replace the filtration membrane of the membrane filter 6 in time. Through setting up second conductivity detector CT02, can detect whether the quality of present purifier water after purifying satisfies the requirement to people's relievedly quote or make preparation for carrying out next filtration, alleviate subsequent filtration pressure. Further, a flow meter FT01 is provided at the output end of the membrane filter 6, and the output speed of the water flow can be controlled.

In some embodiments, as shown in fig. 1, the membrane filter 6 includes a softened pure water output line 61 and a hardened waste water output line 62, the softened pure water output line 61 is used for outputting softened pure water, the hardened waste water output line 62 is used for outputting hardened waste water, the hardened waste water output line 62 includes a main line 621 and a bypass 622, the bypass 622 includes a first throttle valve 7, and the intermittent opening of the first throttle valve 7 controls the intermittent opening of the bypass 622 to accelerate the discharge of the surface contaminants on the membrane filter 6.

As shown in fig. 1, two first throttle valves 7 are disposed on the bypass 622, and the first throttle valves 7 may be solenoid valves or manual valves, specifically, the first throttle valve 7 located upstream is a solenoid valve, and the first throttle valve 7 located downstream is a manual valve. After the downstream manual valve is adjusted, the bypass 622 may be opened and closed only by the upstream solenoid valve. By intermittently opening the bypass 622, the discharge of the contaminants on the surface of the membrane filter 6 is accelerated, and the probability of the contaminants adhering to the surface of the filter membrane can be reduced. Wherein the wastewater discharged from the hardened wastewater output pipeline is collected by the waste collection device 9.

In the above embodiments, the folded membrane filter 4 includes a folded membrane cartridge, and the folded membrane cartridge is an integrally formed structure. Specifically, the folded membrane filter element is formed by folding and compressing a tubular polypropylene film. Compared with the folded membrane filter element formed by bonding a single polypropylene membrane after being folded and compressed, the integrally formed folded membrane filter element has no seam and weak areas such as seams, and the service life of the folded membrane filter element can be prolonged. As shown in fig. 2, the manufacturing process of the folded membrane cartridge is as follows: taking a melt-blown polypropylene film pipe 41, then folding and compressing the polypropylene film pipe 41, then shaping and compacting the compressed polypropylene film pipe 41, and finally putting the polypropylene film pipe 41 into a frame 42 for fixing, thus completing the manufacture of the folded film filter core.

The second aspect of the present application provides a water purifier, which comprises the maintenance-free pretreatment water purification device described above.

The maintenance-free pretreatment water purifying device comprises a multi-stage filter, a membrane filter 6, a pressure detection assembly and a control assembly, so that the maintenance-free pretreatment water purifying device can automatically carry out back washing on the laminated filter 2 and the multi-media filter 3, manpower and material resources are saved, the service condition of the multi-stage filter can be dynamically monitored conveniently, and the filtered water quality is ensured. In addition, the membrane filter 6 is used for softening water, softening salt is avoided, resource waste can be reduced, and cost is further saved. Therefore, the water purifier with the maintenance-free pretreatment water purifying device can reduce the manual replacement of consumables and the manual detection of water quality, and save manpower and material resources.

The third aspect of the present application provides a hemodialysis system including the maintenance-free pretreatment water purification apparatus described above.

The maintenance-free pretreatment water purifying device included in the hemodialysis system is used by matching the multi-stage filter, the membrane filter 6, the pressure detection component and the control component, so that the maintenance-free pretreatment water purifying device can automatically carry out back washing on the laminated filter 2 and the multi-media filter 3, manpower and material resources are saved, the service condition of the multi-stage filter can be dynamically monitored conveniently, and the filtered water quality is ensured. In addition, the membrane filter 6 is used for softening water, so that the use of softening salt is avoided, the resource waste can be reduced, and the cost is further saved. Therefore, the hemodialysis system with the maintenance-free pretreatment water purification device can reduce the manual replacement of consumables and the manual detection of water quality, and save manpower and material resources.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present application are described in a related manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (9)

1. The utility model provides a non-maintaining preliminary treatment purifier which characterized in that includes: the water inlet pump, the multistage filter, the booster pump and the membrane filter are sequentially communicated in series, the water inlet end of the water inlet pump is communicated with a water source, the water outlet end of the membrane filter is used for outputting softened purified water, and the multistage filter at least comprises a laminated filter, a multi-media filter and a folded membrane filter which are sequentially communicated in series;

a pressure detection assembly including at least a first pressure sensor and a second pressure sensor for detecting pressure between an input and an output of one or both of the multi-stage filters, respectively;

and a control component.

2. The maintenance-free, pre-treated water purification apparatus of claim 1, further comprising a conductivity detection assembly, the conductivity detection assembly comprising at least a first conductivity detector for detecting conductivity at an output of the multimedia filter or the pleated membrane filter.

3. The maintenance-free pretreatment water purifying device according to claim 1, wherein the laminated filter comprises a first back-washing pipeline communicated with the laminated filter, a three-way valve is arranged at a water inlet end of the laminated filter, the three-way valve comprises a bypass valve port, a water inlet valve port and a water outlet valve port, and a first throttle valve is arranged between the laminated filter and the multi-media filter.

4. The water purifying device with maintenance-free pretreatment according to claim 1, wherein the multi-stage filter comprises a plurality of multi-media filters connected in parallel, each multi-media filter comprises a multi-way switching control valve and a second back-flushing pipeline communicated with the multi-way switching control valve, the output end of each multi-media filter is provided with a one-way valve, a first throttle valve is arranged between the laminated filter and the multi-media filters, the first throttle valves are arranged in one-to-one correspondence with the multi-media filters, and the control component can respectively control the conduction state of each multi-way switching control valve so that the multi-media filters are respectively in a filtering state and/or a non-filtering state.

5. The maintenance-free pretreatment water purification device according to any one of claims 1 to 4, wherein the membrane filter comprises a softened pure water output line and a hardened waste water output line, the softened pure water output line is used for outputting softened pure water, the hardened waste water output line is used for outputting hardened waste water, the hardened waste water output line comprises a main line and a bypass, the bypass comprises a first throttle valve, and the intermittent opening of the first throttle valve controls the intermittent opening of the bypass to accelerate the discharge of dirt on the surface of the membrane filter.

6. The maintenance-free pretreatment water purification device according to any one of claims 1 to 4, wherein the folded membrane filter comprises a folded membrane cartridge, the folded membrane cartridge is of an integrally formed structure, and the folded membrane cartridge is formed by folding and compressing a tubular polypropylene film.

7. The maintenance-free pre-treatment water purifying device according to any one of claims 1 to 4, wherein the volume of the filter medium of the multi-medium filter accounts for 60 to 75 percent of the volume of the multi-medium filter.

8. A water purifier, characterized in that it comprises a maintenance-free pre-treatment water purification apparatus according to any one of claims 1 to 7.

9. A hemodialysis system, comprising the maintenance-free pre-treatment water purification apparatus of any one of claims 1-7.

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