Water filtration system and control method thereof

Abstract

The present invention discloses a water filtration system and a control method thereof, wherein the water filtration system comprises a filter element having a raw water inlet, a clean water outlet and a wastewater outlet, and further comprises a wastewater control device arranged at the wastewater outlet, the wastewater control device comprising: a first switch valve, which is used to intermittently open the wastewater outlet according to a predetermined time. The technical solution of the present invention realizes pulse drainage of the wastewater outlet of the water filtration system by setting a first switch valve and intermittently opening the first switch valve, thereby reducing the wastewater flow and achieving the effect of water saving.

Description

Technical Field

[0001] The invention relates to the field of liquid filtration, and in particular to a water filtration system and a control method thereof. Background Art

[0002] In the existing small flux reverse osmosis water purification system, during the operation of the water purification system, the wastewater outlet of the device has been continuously discharging wastewater, and the wastewater rate is high. In addition, due to the idle membrane area and membrane shell, it is difficult to improve the small flux high recovery rate, and at the same time, the life of the water purification system cannot be guaranteed. Summary of the invention

[0003] The main purpose of the invention is to provide a water filtration system, aiming to reduce the wastewater flow rate and achieve better water-saving effect.

[0004] To achieve the above-mentioned purpose, the water filtration system proposed in the present invention includes a filter element having a raw water inlet, a clean water outlet and a wastewater outlet, and is characterized in that it also includes a wastewater control device arranged at the wastewater outlet, and the wastewater control device includes: a first switch valve, which is used to intermittently open the wastewater outlet according to a predetermined time.

[0005] Preferably, the wastewater control device further comprises: a throttle valve, which is used to control the flow rate of wastewater discharged from the wastewater outlet according to a preset flow rate when the first switch valve is opened.

[0006] Preferably, the water filtration system further comprises: a water quality detector for detecting the water quality at the raw water inlet and controlling the wastewater control device according to the water quality at the raw water inlet.

[0007] Preferably, the water filtration system also includes: a first storage module, which stores a preset water quality-time comparison table; a first control device, which controls the first switch valve to intermittently open the wastewater outlet at a predetermined time according to the water quality at the raw water inlet and the water quality-time comparison table.

[0008] Preferably, the water filtration system also includes: a second storage module, which stores a preset water quality-flow comparison table; a second control device, which controls the throttle valve according to the water quality at the raw water inlet and the water quality-flow comparison table so that the wastewater outlet discharges wastewater at a preset flow rate.

[0009] Preferably, the water filtration system also includes: a flushing pipeline, which is connected to the wastewater outlet and is connected in parallel with the wastewater pipeline where the first switch valve is located; a second switch valve, which is arranged in the flushing pipeline and is linked to the first switch valve; when the first switch valve is opened and the second switch valve is closed, the water filtration system processes the filtration state; when the first switch valve is closed and the second switch valve is opened, the water filtration system processes the flushing state.

[0010] Preferably, the opening time of the first switch valve is 2 to 5 seconds.

[0011] Preferably, the closing time of the first switch valve is 1 to 2 seconds.

[0012] The present invention also proposes a control method for a water filtration system, which includes the following steps: detecting the water quality at the raw water inlet; intermittently opening the wastewater outlet at a predetermined time according to the detected water quality and / or controlling the flow rate of wastewater discharged from the wastewater outlet at a preset flow rate.

[0013] Preferably, the predetermined time is 2 to 5 seconds for opening and 1 to 2 seconds for closing.

[0014] The technical solution of the present invention realizes pulse drainage of the wastewater outlet of the water filtration system by setting a first switch valve at the wastewater outlet and intermittently opening the first switch valve according to a predetermined intermittent time, thereby reducing the wastewater flow and achieving the effect of water saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A simplified schematic diagram of an embodiment of a water filtration system of the present invention;

[0017] Figure 2 This is a schematic diagram of a functional module of the present invention;

[0018] Figure 3 This is a schematic diagram of a functional module of the present invention;

[0019] Figure 4 A schematic diagram of the steps of the control method of the water filtration system of the present invention.

[0020] Description of Figure Numbers:

[0021] Label name Label name 10 Pressure pump 50 Pipeline 20 Filter Elements 51 Raw water pipeline 30 First switch valve 52 Clean water pipeline 40 Throttle valve 53 Wastewater pipeline 60 Second switch valve 54 Flushing pipeline 71 First control device 72 Second control device 80 Water quality detector 91 First storage module 92 Second storage module

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The invention provides a water filtration system.

[0027] In the embodiment of the present invention, Figure 1 As shown, the water filtration system includes a filter element 20 having a raw water inlet, a clean water outlet and a wastewater outlet, and is characterized in that it also includes a wastewater control device arranged at the wastewater outlet, and the wastewater control device includes: a first switch valve 30, which is used to intermittently open the wastewater outlet according to a predetermined time.

[0028] Specifically, a wastewater pipe 53 connected to the filter element 20 is provided at the wastewater outlet, and the first switch valve 30 is installed on the wastewater pipe 53. The first switch valve 30 is used to open or close the wastewater pipe 53. When the first switch valve 30 is opened, wastewater flows from the wastewater outlet through the wastewater pipe 53 and is discharged from one end of the wastewater pipe 53. When the first switch valve 30 is closed, the wastewater pipe 53 is in a disconnected state, and wastewater cannot be discharged from the wastewater pipe 53. By setting the first switch valve 30 on the wastewater pipe 53 and setting a predetermined time, the first switch valve 30 is intermittently opened and closed within a predetermined time, that is, the first switch valve 30 is opened for a period of time, then closed for a period of time, and then opened for a period of time... and the opening and closing are performed in such a cycle, so as to realize intermittent drainage of the water filtration system. Through this intermittent drainage method, on the one hand, the wastewater drainage volume of the water filtration system is reduced, the output of pure water is increased, and the water saving effect is achieved; on the other hand, due to the intermittent drainage, when the first switch valve 30 is closed, the wastewater pipeline 53 is in a closed state, and the pressure at the wastewater drainage port is increased, so that the pure water flux of the filter element 20 is relatively increased, and water is further saved. In this way, the purpose of water saving is achieved, and the filter element 20 is not damaged, and the life of the filter element 20 is guaranteed. Among them, the intermittent time of the first switch valve 30 can be adjusted. For example, in a certain case, the intermittent time is open for 4s and closed for 1s. In another case, the intermittent time can be changed to open for 3.5s and closed for 1.5s. The wastewater control device can be the first switch valve 30 alone, and can also include other equipment to adjust the wastewater in the wastewater pipeline 53.

[0029] Furthermore, the wastewater control device further includes: a throttle valve 40, which is used to control the flow rate of wastewater discharged from the wastewater outlet according to a preset flow rate when the first switch valve 30 is opened. In this embodiment, the throttle valve 40 is a solenoid valve, which is arranged on the wastewater pipeline 53 to adjust the flow rate of the wastewater pipeline 53. The throttle valve 40 is arranged at a position of the wastewater outlet far away from the filter element 20 relative to the first switch valve 30, and the opening of the throttle valve 40 is adjusted to be larger or smaller, and cooperates with the first switch valve 30 to put the water filtration system in the best working state. The throttle valve 40 can also be a manual valve.

[0030] Furthermore, the water filtration system also includes a water quality detector 80, which is used to detect the water quality at the raw water inlet and control the wastewater control device according to the water quality at the raw water inlet. The water quality detector 80 is installed at the raw water inlet, so that the water quality at the raw water inlet can be detected. The user can understand the water quality of the raw water to be filtered, and then adjust the water filtration system according to the water quality detected by the water quality detector 80, of course, including adjusting the intermittent opening time of the first switch valve 30 and the opening of the throttle valve 40. The adjusted parameters include the ratio and flow rate of wastewater and clean water, the pressure of the water filtration system, etc., to achieve the best water-saving effect under the condition of meeting the water inlet flow rate and ensure the life of the water filtration system. Among them, a water quality detector 80 can also be set at the clean water outlet to check the water quality of the clean water and ensure that the water quality of the clean water after filtration meets the standard.

[0031] Further, if Figure 2 As shown, the water filtration system also includes: a first storage module 91, which stores a preset water quality-time comparison table; a first control device 71, which controls the first switch valve 30 to intermittently open the wastewater outlet according to a predetermined time according to the water quality at the raw water inlet and the water quality-time comparison table. The water quality in the water quality-time comparison table refers to the water quality of the raw water, and the time in the comparison table refers to the time when the first switch valve 30 is intermittently opened, including the time when the first switch valve 30 is opened and the time when the first switch valve 30 is closed. The water quality-time comparison table preset in the first storage module 91 is obtained by experiments or experience. When raw water of a certain water quality is filtered through the water filtration system, it is determined by experiments or experience that the raw water of the water quality is opened at which intermittent time of the first switch valve 30, and the best water-saving effect can be achieved under the condition of normal use. Then, the water quality and the intermittent time corresponding to the water quality with the best water-saving effect are statistically recorded one by one to form a water quality-time comparison table. The water quality in the water quality-time comparison table is a range value. When the water quality of the raw water falls into a certain range value, the corresponding interval time of the water quality of the raw water is known. The water quality-time comparison table is stored in the first storage module 91. The first control device 71 can read the data in the first storage module 91, and the first control device 71 also receives the signal of the water quality detection data sent by the water quality detector 80.

[0032] During the operation of the water filtration system of this embodiment, the water quality detector 80 first detects the raw water quality at the raw water inlet, and then sends the raw water quality data to the first control device 71. After receiving the raw water quality data, the first control device 71 queries the water quality-time comparison table in the first storage module 91 to find out the intermittent time corresponding to the raw water quality. The first control device 71 controls the first switch valve 30 to open and close according to the intermittent time obtained, so that the water filtration system achieves the best water-saving effect.

[0033] Further, such as Figure 3 As shown, the water filtration system also includes: a second storage module 92, which stores a preset water quality-flow comparison table; a second control device 72, which controls the throttle valve 40 to discharge wastewater at a preset flow rate according to the water quality at the raw water inlet and the water quality-flow comparison table. Among them, the second storage module 92 and the first storage module 91 can be the same storage device, or they can be different storage devices. Similarly, the second control device 72 and the first control device 71 can be the same control device, or they can be different control devices. The water quality in the water quality-flow comparison table refers to the water quality of the raw water, and the flow in the comparison table refers to the flow controlled by the throttle valve 30. The water quality-flow comparison table preset in the second storage module 92 is obtained by experiments or experience.

[0034] It should be emphasized that the water quality in the water quality-flow comparison table is the same as the water quality in the water quality-time comparison table, and the preparation and use of the water quality-flow comparison table are the same as those of the water quality-time comparison table. In addition, the flow rate of the throttle valve is also related to parameters such as the type of water filtration system.

[0035] During the operation of the water filtration system of this embodiment, the water quality detector 80 sends the data of the raw water quality detected at the raw water inlet to the second control device 72. After receiving the data of the raw water quality, the second control device 72 queries the water quality-flow comparison table in the second storage module 92 to find the flow corresponding to the raw water quality. The second control device 72 controls the throttle valve 40 according to the queried flow rate and adjusts its opening according to the flow rate, so that the water filtration system achieves the best water-saving effect.

[0036] Furthermore, the water filtration system further includes a flushing pipeline 54, which is connected to the wastewater outlet and is connected in parallel with the wastewater pipeline 53 where the first switch valve 30 is located; a second switch valve 60 is arranged in the flushing pipeline 54 and is linked to the first switch valve 30. In this embodiment, the wastewater outlet is directly connected to the wastewater outlet including the wastewater pipeline 53 and the flushing pipeline 54, wherein the wastewater pipeline 53 and the flushing pipeline 54 are connected in parallel, and the second switch valve 60 is arranged on the flushing pipeline 54 to open or close the flushing pipeline 54. When the water filtration system is filtering, the second switch is closed 60, the flushing pipeline 54 is in a closed state, the first switch valve 30 is opened intermittently according to the preset time, and the throttle valve 30 is also opened according to a predetermined program. At this time, the water filtration system is in a normal filtering working state; when the water filtration system is flushing, the first switch valve 30 is closed, the wastewater pipeline 53 is in a closed state, the second switch valve 60 is opened, and the flushing pipeline 54 is in an open state. The water in the filter element 20 can flush the reverse osmosis membrane, and the wastewater after flushing is discharged through the flushing pipeline 54 to ensure the normal use of the filter element 30.

[0037] In this embodiment, the water filtration system further includes a pressure pump 10, which is connected to the filter element 20 through the raw water purification port, thereby increasing the water pressure at the raw water inlet, which is beneficial to the filtration of raw water by the water filtration system. The equipment in the water filtration system is connected through a pipeline 50, wherein the raw water pipeline 53 connects the pressure pump 10 and the raw water inlet, and the purified water pipeline 52 connects the purified water outlet.

[0038] Preferably, the first switch valve is opened for 2 to 5 seconds and has a wall hanging time of 1 to 2 seconds.

[0039] The invention also provides a control method for the water filtration system.

[0040] In an embodiment of the present invention, Figure 4 As shown, the control method of the water filtration system includes the following steps:

[0041] S10: Detect the water quality at the raw water inlet;

[0042] S20: intermittently opening the wastewater outlet at a predetermined time according to the detected water quality and / or controlling the flow rate of wastewater discharged from the wastewater outlet according to a preset flow rate.

[0043] First, the water quality detector detects the water quality of the raw water at the raw water inlet of the filter element, and then adjusts the intermittent opening time of the first switch valve on the wastewater pipeline according to the water quality of the raw water. Of course, the opening of the throttle valve on the wastewater pipeline can also be adjusted on the basis of adjusting the first switch valve to control the wastewater flow. The following takes the simultaneous adjustment of the first switch valve and the throttle valve as an example for explanation.

[0044] It should be emphasized that the adjustment of the first switch valve and the wastewater valve can be manual or automatic. If it is manual, the user first obtains the water quality data of the raw water detected by the water quality detector, and then obtains the corresponding intermittent time of the first switch valve and the flow rate that the throttle valve should control based on the water quality data. Then the user manually adjusts the first switch valve and the throttle valve according to the obtained intermittent time and flow rate.

[0045] When it is automatic control, it includes a control device and a storage device. The control device can be used to control the predetermined time of the first switch valve and the opening of the throttle valve, and the storage module always stores a water quality-time comparison table and a water quality-flow comparison table. The water quality in the water quality-time comparison table refers to the water quality of the raw water, and the time in the comparison table refers to the time when the first switch valve is intermittently opened, including the time when the first switch valve is opened and the time when the first switch valve is closed. The water quality in the water quality-flow comparison table also refers to the water quality of the raw water, and the flow in the comparison table refers to the flow controlled by the throttle valve. The water quality-flow comparison table preset in the second storage module is obtained based on experiments or experience.

[0046] Determine by experiment or experience, at which interval time the first switch valve is opened for the raw water of the water quality, and at which flow rate the throttle valve is at, under the condition of satisfying normal use, the best water-saving effect can be achieved, and then the relevant data are statistically recorded. Then the water quality and the interval time and flow rate corresponding to the water quality with the best water-saving effect are statistically recorded one by one, and a water quality-time comparison table and a water quality-flow comparison table are prepared. Among them, the water quality in the water quality-time comparison table and the water quality-flow comparison table is a range value. When the water quality of the raw water detected falls into a certain range value, the interval time and flow direction corresponding to the water quality of the raw water are known. The water quality-time comparison table and the water quality-flow comparison table are stored in the storage module, and the control device can read the data in the storage module, and the control device also receives the signal of the water quality detection data sent by the water quality detector.

[0047] The specific steps of the automatic adjustment are as follows: first, the water quality detector detects the raw water quality at the raw water inlet, and then sends the raw water quality data to the control device. After receiving the raw water quality data, the control device queries the water quality-time comparison table and the water quality-flow comparison table in the storage module to find out the intermittent time and flow corresponding to the raw water quality. The control device controls the first switch valve to open and close according to the intermittent time and the throttle valve to open according to the flow regulator opening according to the intermittent time and flow found, so that the water filtration system achieves the best water-saving effect.

[0048] Preferably, in the control method of the water filtration system, the predetermined opening time is 2 to 5 seconds, and the closing time is 1 to 2 seconds, that is, the intermittent opening time of the first switch valve is 2 to 5 seconds, and the closing time is 1 to 2 seconds.

[0049] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water filtration system, comprising a filter element having a raw water inlet, a clean water outlet and a waste water outlet, characterized in that: It also includes a wastewater control device disposed at the wastewater outlet, the wastewater control device comprising: A first switch valve, used to intermittently open the wastewater outlet according to a predetermined time; The wastewater control device also includes: A throttle valve, used to control the flow rate of wastewater discharged from the wastewater outlet according to a preset flow rate when the first switch valve is opened; A water quality detector, used to detect the water quality at the raw water inlet and control the wastewater control device according to the water quality at the raw water inlet; A first storage module stores a preset water quality-time comparison table; A first control device controls the first switch valve to intermittently open the wastewater outlet at a predetermined time according to the water quality at the raw water inlet and the water quality-time comparison table; After receiving the raw water quality data output by the water quality detector, the first control device queries the water quality-time comparison table of the first storage module to find out the intermittent time corresponding to the raw water quality data, and the first control device controls the first switch valve to intermittently open and close the first switch valve according to the intermittent time corresponding to the raw water quality data; The second storage module stores a preset water quality-flow comparison table; The second control device controls the throttle valve to discharge wastewater from the wastewater outlet at a preset flow rate according to the water quality at the raw water inlet and the water quality-flow comparison table; After receiving the raw water quality data, the second control device queries the water quality-flow comparison table in the second storage module to find the flow corresponding to the raw water quality, and the second control device controls the throttle valve according to the queried flow to adjust its opening according to the flow.

2. The water filtration system according to claim 1, characterized in that Also includes: A flushing pipeline, the flushing pipeline is connected to the wastewater outlet and is connected in parallel with the wastewater pipeline where the first switch valve is located; A second switch valve is arranged in the flushing pipeline and is linked with the first switch valve; When the first switch valve is opened and the second switch valve is closed, the water filtration system processes a filtering state; when the first switch valve is closed and the second switch valve is opened, the water filtration system processes a flushing state.

3. The water filtration system according to claim 1, characterized in that: The opening time of the first switch valve is 2 to 5 seconds.

4. The water filtration system according to claim 1, characterized in that: The closing time of the first switch valve is 1 to 2 seconds.

5. A method for controlling a water filtration system, applied to the water filtration system according to any one of claims 1 to 4, characterized in that: The control method of the water filtration system comprises the following steps: Detect the water quality at the raw water inlet; The wastewater outlet is intermittently opened at a predetermined time according to the detected water quality and / or the flow rate of wastewater discharged from the wastewater outlet is controlled at a preset flow rate.

6. The control method of the water filtration system according to claim 5, characterized in that: The predetermined time is specifically 2 to 5 seconds for the opening time and 1 to 2 seconds for the closing time.

Images