A large-flow ultrafiltration membrane water purification device with self-cleaning and backwashing functions

Abstract

The utility model relates to water purification technical field discloses a big flow ultrafiltration membrane water purifier with self -cleaning and backwash function, including prefilter and two or more than two parallel connection's ultrafiltration membrane water purifier, water purifier purifying water export is equipped with the three ways, and the three ways are connected with the loose joint and become two water purifier's purifying water cavity intercommunication, and the water inlet and sewage water mouth of water purifier are equipped with control valve and three ways, and the three ways are connected with the loose joint and become water inlet channel and sewage water channel respectively, through closing or opening corresponding water inlet control valve and sewage water control valve, the purifying water of water purifier automatic backwash is carried out to the filter core of another water purifier, and backwash is crossed and is carried out between two or more than two water purifiers, and sewage water pipeline communication is often used water's wash vegetables pool, mop pool, such as toilet equipment, and the function of backwash and sewage water at any time is superimposed, makes filter core more clean, if maintaining properly, the service life of water purifier filter core reaches at least ten years or more.

Description

Technical Field

[0001] This utility model relates to the field of water purification device technology, and in particular to a high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions. Background Technology

[0002] Ultrafiltration membrane water purifiers have emerged as a prominent type of water purifier in the last decade. Due to their large purification capacity, they are particularly suitable for purifying various types of water, including tap water, groundwater, and even muddy water. They are widely used in homes, businesses, and rural well-drilling operations. Ultrafiltration membrane water purifiers are further divided into internal pressure and external pressure types, depending on the inlet, outlet, and internal filter structure. After about a month of use, a large amount of impurities such as sediment, rust, bacteria, colloids, and suspended solids will accumulate on the membrane wall and within the micropores of the membrane fibers. To ensure the purification effect and extend the filter's lifespan, the wastewater valve must be manually opened approximately once a month to remove these impurities from the membrane wall, allowing the purifier to continue operating normally. However, this periodic wastewater removal method presents two problems: firstly, in the period leading up to the scheduled manual wastewater removal, the ultrafiltration membrane... The filter cartridge will contain a large amount of dirt, bacteria and other impurities, which may cause bacteria to accumulate and multiply in the effluent, resulting in secondary pollution of the water inside the ultrafiltration membrane water purifier. Secondly, this kind of sewage discharge can only remove impurities such as mud, rust and suspended solids on the surface of the ultrafiltration membrane filter cartridge. It cannot remove viscous impurities such as bacteria, colloids and suspended solids in the micropores of the ultrafiltration membrane filter cartridge. These impurities will cause blockage of the micropores of the ultrafiltration membrane filter cartridge. Therefore, the service life of ultrafiltration membrane water purifier filter cartridges with this kind of periodic sewage discharge is generally 2-3 years.

[0003] Currently, there is another way to manually clean the filter cartridges of external pressure ultrafiltration membrane water purifiers, also known as hand washing ultrafiltration membrane water purifiers. This manual cleaning method can extend the service life of the ultrafiltration membrane water purifier filter cartridges to 3-5 years. However, this method requires disassembling the ultrafiltration membrane water purifier to clean the filter cartridges. Ordinary users cannot disassemble, clean, and reassemble the water purifier themselves. This operation requires professional personnel. Moreover, during the cleaning process, a slight mistake may break the ultrafiltration membrane filaments at the root of the epoxy resin seal, rendering the filter cartridge unusable and requiring replacement for normal water purification.

[0004] Existing technologies use tap water to directly backwash the ultrafiltration membrane filter element. This method is relatively simple and practical, and significantly improves the service life of the ultrafiltration membrane filter element. For example, two authorized utility model patents exist: an external pressure ultrafiltration membrane water purifier with backwashing function (patent number: ZL 2024 2 0977497.1) and an internal pressure ultrafiltration membrane water purifier with backwashing function (patent number: ZL 2024 2). 0977221.X uses a three-way reversing valve to reverse the water flow, backwashing the ultrafiltration membrane cartridge with tap water. This significantly improves the cleanliness of the ultrafiltration membrane cartridge. Practice has shown that this method of backwashing the ultrafiltration membrane cartridge with tap water extends its lifespan to an average of about 10 years. This backwashing method is perfectly feasible for urban tap water with good quality. However, it is not suitable for areas with poor tap water quality, especially remote and scattered villages where groundwater is directly extracted from wells and treated simply before being used as tap water. Using raw water containing many impurities to directly backwash the cartridge is not feasible because the impurities will clog the micropores of the ultrafiltration membrane, affecting the quality of purified water and significantly reducing the lifespan of the ultrafiltration membrane cartridge.

[0005] Therefore, there is an urgent need for an ultrafiltration membrane water purifier that allows for easy cleaning of the filter element without disassembling the ultrafiltration membrane water purifier, and can remove impurities from the filter element at any time, ensuring that the filter element operates in a clean state. This would improve the quality of purified water and extend the service life of the filter element to the greatest extent possible, thus solving the aforementioned technical problems. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, the technical approach of this utility model is to improve the existing monthly periodic sewage discharge method to an on-demand sewage discharge method. Furthermore, it improves the existing method of directly backwashing the ultrafiltration membrane filter element with tap water containing a certain amount of impurities to a method of backwashing the filter element of another ultrafiltration membrane water purifier with purified water produced by one of the ultrafiltration membrane water purifiers. By simply closing or opening the corresponding control valves, the ultrafiltration membrane water purifiers can achieve self-cleaning between the ultrafiltration membrane filter elements at any time without manual disassembly, preventing secondary contamination of the ultrafiltration membrane filter elements by bacteria, colloids, suspended solids, and other impurities in tap water. The on-demand sewage discharge method maintains the ultrafiltration membrane filter elements in a clean state daily, greatly extending the service life of the filter elements.

[0007] The technical solution of this utility model is as follows: a high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions, including a pre-filter and two ultrafiltration membrane water purifiers connected in parallel. The inlet of each ultrafiltration membrane water purifier is provided with an inlet control valve, and an inlet tee is provided on the outside of each inlet control valve. The inlet tee is connected with a union to form a tap water inlet channel. The outlet of the pre-filter is connected to the inlet tee of the water purifier with a union to form a complete tap water inlet channel.

[0008] As a preferred option, the purified water outlets of two or more ultrafiltration membrane water purifiers connected in parallel are each equipped with a purified water outlet tee. The outlet tees are connected by a flexible joint to form a purified water outlet channel. A purified water control valve and a purified water output pipe are provided on the outside of the purified water channel. The purified water output pipe is connected to equipment with high water quality requirements, such as water dispensers and purified water faucets in kitchen sinks.

[0009] As a preferred embodiment, the wastewater outlet of the ultrafiltration membrane water purifier is equipped with a wastewater control valve, and a wastewater tee is provided on the outside of the wastewater control valve. The wastewater tee is connected with a union to form a wastewater channel. The wastewater outlet of the pre-filter is equipped with a wastewater control valve. The wastewater control valve is connected to the wastewater tee with a wastewater hose to form a common wastewater channel. The wastewater channel is connected to frequently used water sinks, mop sinks, toilets, and other equipment that do not have high requirements for water quality.

[0010] Preferably, the purification water cavities of two or more ultrafiltration membrane water purifiers are interconnected. By closing or opening the inlet control valve and outlet control valve of the corresponding ultrafiltration membrane water purifier, the purified water generated by one ultrafiltration membrane water purifier is used to backwash the filter element of another ultrafiltration membrane water purifier. The backwashing of the filter element of the ultrafiltration membrane water purifier is carried out alternately between the two ultrafiltration membrane water purifiers.

[0011] Preferably, the ultrafiltration membrane water purifier is either an internal pressure ultrafiltration membrane water purifier or an external pressure ultrafiltration membrane water purifier.

[0012] The beneficial effects of this utility model are:

[0013] 1. This water purification device uses two or more ultrafiltration membrane water purifiers to operate in parallel. Increasing the number of water purifiers can increase the purified water flow rate and meet the needs of large flow water purification in different environments. At the same time, the mutual backwashing function between ultrafiltration membrane water purifiers can be realized by switching the inlet water control valve and the wastewater discharge control valve.

[0014] 2. This device uses the purified water generated by one of the water purifiers to backwash the filter cartridge of the other water purifier. By combining backwashing with the function of automatically cleaning the filter cartridge by draining sewage at any time, the water purifier filter cartridge operates in a clean state for a long time. If properly maintained, the service life of the water purifier filter cartridge is at least ten years.

[0015] 3. The purified water outlet, inlet, and outlet all use T-junctions for connection and modular assembly is achieved through unions (quick connectors), which facilitates maintenance and replacement and is especially suitable for mass production in small-scale enterprises;

[0016] 4. Enables high-flow-rate purified water supply. The parallel design and installation of multiple water purifiers supports high-flow-rate purified water demand, suitable for home, commercial, canteen, office, mountainous, and rural well drilling needs.

[0017] 5. Reuse of wastewater: Wastewater pipes are connected to frequently used water devices such as vegetable washing sinks, mop flushing sinks, and toilets, which do not have high requirements for water quality. This maintains the automatic cleaning of the water purifier filter while reducing water waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a first embodiment of the high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions of this utility model;

[0019] Figure 2 This is a front view of Embodiment 1 of the present utility model;

[0020] Figure 3 This is a top view of an embodiment of the present utility model;

[0021] Figure 4 This is a front view of Embodiment 2 of the present invention;

[0022] Figure 5 This is a top view of Embodiment 2 of the present invention;

[0023] Figure 6 This is a front view of Embodiment 3 of the present invention;

[0024] Figure 7 This is a left view of Embodiment 3 of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] Explanation of the main symbols in Embodiment 1 of this utility model:

[0027] See details Figure 2 , Figure 3

[0028] 1. Internal pressure ultrafiltration membrane water purifier; 101. Ultrafiltration membrane water purifier inlet; 102. Inlet control valve; 103. Inlet tee; 104. Union; 105. Tap water inlet channel; 121. Purified water outlet; 122. Purified water tee; 123. Plug; 124. Purified water channel; 125. Union; 131. Wastewater outlet; 132. Wastewater control valve; 133. Wastewater tee; 2. Internal pressure ultrafiltration membrane water purifier; 201. Water purifier inlet; 202. Inlet control valve; 203. Inlet tee; 204. Union; 205. Plug; 221. Purified water outlet; 222. Purified water tee; 223. Purified water control valve; 224. Purified water output channel; 231. Wastewater outlet 232. Wastewater control valve; 233. Wastewater tee; 234. Union four; 235. Wastewater pipe; 301. Inlet cavity of ultrafiltration membrane water purifiers 1 and 2; 302. Epoxy resin seal of filter element of ultrafiltration membrane water purifiers 1 and 2; 303. Filter element of internal pressure ultrafiltration membrane water purifiers 1 and 2; 304. Purified water cavity of water purifiers 1 and 2; 305. Outer shell of ultrafiltration membrane water purifiers 1 and 2; 306. Wastewater cavity of ultrafiltration membrane water purifiers 1 and 2; 4. Pre-filter; 401. Pre-filter outlet; 402. Pre-filter inlet; 403. Tap water pipe; 404. Pre-filter inlet cavity; 405. Stainless steel filter screen; 406. Wastewater outlet of pre-filter; 407. Wastewater control valve; 408. Wastewater hose.

[0029] Explanation of the main symbols in Embodiment 2 of this utility model:

[0030] See details Figure 4 , Figure 5

[0031] 1. External pressure ultrafiltration membrane water purifier; 101. Ultrafiltration membrane water purifier inlet; 102. Inlet control valve; 103. Inlet tee; 104. Union; 105. Inlet channel; 106. Union; 121. Purified water outlet; 122. Purified water tee; 123. Plug; 124. Purified water channel; 125. Union; 131. Water purifier wastewater outlet; 132. Wastewater discharge control valve; 133. Wastewater discharge tee; 2. External pressure ultrafiltration membrane water purifier; 201. Water purifier inlet; 202. Inlet control valve; 203. Inlet tee; 204. Plug; 221. Water purifier purified water outlet; 222. Purified water tee; 223. Purified water control valve; 224. Purified water output channel; 231. Water purifier wastewater outlet; 232. Wastewater discharge... 1. Water control valve; 2. Sewage tee; 2. Union; 2. Sewage pipe; 3. Inlet cavity of ultrafiltration membrane water purifiers 1 and 2; 3. Epoxy resin seal of filter element of ultrafiltration membrane water purifiers 1 and 2; 3. Filter element of external pressure ultrafiltration membrane water purifiers 1 and 2; 3. Purified water cavity of ultrafiltration membrane water purifiers 1 and 2; 3. Outer shell of ultrafiltration membrane water purifiers 1 and 2; 3. Sewage cavity of ultrafiltration membrane water purifiers 1 and 2; 4. Pre-filter; 4. Pre-filter outlet; 4. Pre-filter inlet; 4. Tap water pipe; 4. Inlet cavity of pre-filter; 4. Stainless steel filter screen of pre-filter; 4. Sewage outlet of pre-filter; 4. Sewage control valve; 4. Hose.

[0032] Explanation of the main symbols in Embodiment 3 of this utility model:

[0033] See details Figure 6 , Figure 7

[0034] 1. External pressure ultrafiltration membrane water purifier; 101. Pre-filter; 102. Tap water inlet pipe; 103. Inlet tee; 104. Inlet control valve; 105. Pre-filter inlet; 106. Pre-filter wastewater outlet; 107. Wastewater outlet control valve; 108. Wastewater outlet tee; 109. Wastewater outlet hose; 110. Wastewater outlet tee; 111. Wastewater outlet control valve; 112. Wastewater outlet of the membrane water purifier; 113. Plug; 114. Ultrafiltration membrane water purifier... 1. Water outlet of membrane water purifier; 115. Purified water tee; 116. Purified water channel; 117. Union; 118. Union; 119. Inlet channel; 120. Wastewater discharge channel of pre-filter; 121. Union; 122. Union; 123. Wastewater discharge channel of ultrafiltration membrane water purifier; 2. External pressure ultrafiltration membrane water purifier; 201. Pre-filter; 202. Plug; 203. Inlet tee of pre-filter; 204. Inlet control valve; 205. Pre-filter... Filter inlet; 206, Pre-filter wastewater outlet; 207, Wastewater discharge control valve; 208, Wastewater discharge tee; 209, Plug; 210, Wastewater discharge tee; 211, Wastewater discharge control valve; 212, Ultrafiltration membrane water purifier wastewater outlet; 213, Purified water control valve; 214, Purified water outlet; 215, Purified water tee; 216, Purified water supply pipe; 217, Wastewater discharge pipe; 301, Purified water cavity of ultrafiltration membrane water purifiers 1 and 2; 302. Epoxy resin seal of filter elements in ultrafiltration membrane water purifiers 1 and 2; 303. Filter elements of ultrafiltration membrane water purifiers 1 and 2; 304. Water inlet cavity of ultrafiltration membrane water purifiers 1 and 2; 305. Water inlet of ultrafiltration membrane water purifiers 1 and 2; 306. Union; 307. Wastewater cavity of ultrafiltration membrane water purifiers 1 and 2; 308. Water outlet of pre-filter; 309. Water inlet cavity of pre-filters 101 and 201; 310. Stainless steel filter screen of pre-filters 101 and 201. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Embodiment 1 of this utility model:

[0037] Please see Figures 2-3A high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions includes an ultrafiltration membrane water purifier 1, an ultrafiltration membrane water purifier 2, and a pre-filter 4. Both ultrafiltration membrane water purifiers 1 and 2 are internal pressure ultrafiltration membrane water purifiers. The upper part of each ultrafiltration membrane water purifier has a tap water inlet, the middle part has a purified water outlet, and the end of each ultrafiltration membrane water purifier has a wastewater outlet. Ultrafiltration membrane water purifiers 1 and 2 are connected in parallel. The inlets of ultrafiltration membrane water purifiers 1 and 2 are respectively equipped with… Water inlet control valves 102 and 202 are provided with water inlet tees 103 and 203 on their outer sides, respectively. Water inlet tees 103 and 203 are connected by a union 204 to form a tap water inlet channel 105. The outlet 401 of the pre-filter 4 is connected to the water inlet tees 103 by the union 104 to form a tap water inlet channel. The inlet channel is located at the top of the water purifier. The tee at the end of the tap water inlet channel 105 is sealed with a threaded plug 205.

[0038] The purified water outlets of ultrafiltration membrane water purifiers 1 and 2 are respectively equipped with purified water tees 122 and 222. The purified water tees 122 and 222 are connected by a union 125 to form a purified water channel 124. The water inlet cavities 301 of the ultrafiltration membrane water purifiers are interconnected. The purified water outlet channel is located in the middle of the water purifier. One end of the purified water channel 124 is equipped with a purified water control valve 223. A purified water output pipe 224 is located outside the purified water control valve 223. The other side of the purified water tees 122 is sealed with a plug 123. The purified water output pipe is connected to water dispensers, purified water faucets in kitchen sinks, smart dishwashers, smart water heaters, smart washing machines, smart toilets and other equipment with high requirements for water quality.

[0039] The ultrafiltration membrane water purifiers 1 and 2 have sewage discharge control valves 132 and 232 at their sewage discharge outlets 131 and 231, respectively. Sewage discharge tees 133 and 233 are respectively provided on the outside of the sewage discharge control valves 132 and 232. The sewage discharge tees 133 and 233 are connected by a union 234 to form a sewage discharge pipe 235. The sewage discharge channel is located at the lower end of the water purifier. The sewage discharge control valve 407 of the pre-filter 4 is connected to the sewage discharge tees 133 by a sewage discharge hose 408 to form a common sewage discharge pipe 235.

[0040] The mechanism of the tap water purification process of this device is as follows: Open the inlet control valves 102 and 202 of the ultrafiltration membrane water purifiers 1 and 2, open the wastewater discharge valves 132 and 232 of the ultrafiltration membrane water purifiers 1 and 2, open the purified water control valve 223, and open the wastewater discharge control valve 407 of the pre-filter 4 to the 1 / 5-1 / 4 position to achieve a balanced wastewater discharge between the pre-filter and the ultrafiltration membrane water purifier. Tap water enters the pre-filter inlet cavity 404 of the pre-filter 4 through the inlet 402. Under pressure, the tap water passes through a stainless steel filter screen 405 with a precision of 40μm, filtering out large particles of impurities such as silt and rust with a diameter greater than 40μm. The tap water after primary filtration passes through the outlet 401 of the pre-filter 4, the inlet tee 103, and enters the tap water inlet pipe 105 of the water purification device. It then continues to pass through the inlet control valves 102 and 202, respectively, and enters the inlet cavities 301 of the ultrafiltration membrane water purifiers 1 and 2. Under water pressure, the tap water after primary filtration passes through a stainless steel filter screen 405 with a precision of 40μm. The 0.01μm internal pressure ultrafiltration membrane water purifier filter element 303 filters out all impurities such as bacteria, colloids, and suspended solids with a particle diameter greater than 0.01μm. The purified water is collected in the water purification cavity 304 of the water purifier and enters the water purification channel 124 through the water purification tee 122 and 222. The outside of the water purification channel 124 is equipped with a water purification control valve 223, and the outside of the water purification control valve 223 is the water purification output channel 224. The water purification output channel 224 is connected to water dispensers, water purification faucets in kitchen sinks, smart dishwashers, smart water heaters, smart washing machines, smart toilets and other equipment with high requirements for water quality.

[0041] Wastewater containing bacteria, colloids, suspended solids, heavy metals, and other impurities with a particle diameter greater than 0.01μm accumulates in the wastewater cavity 306 and enters the wastewater discharge pipe 235 through the wastewater discharge control valves 132 and 232. Wastewater containing large particles such as mud, sand, and rust with a particle diameter greater than 40μm, filtered out by the pre-filter 4, enters the wastewater discharge pipe 235 through the wastewater discharge control valve 407 and the wastewater discharge hose 408. The wastewater discharge pipe 235 connects to frequently used equipment such as vegetable washing sinks, mop sinks, and toilets where water quality requirements are not high, so that wastewater can be discharged at any time, keeping the ultrafiltration membrane filter element clean at all times and extending the service life of the ultrafiltration membrane water purifier filter element.

[0042] The aforementioned vegetable washing sink should be equipped with two faucets: one for purified water and one for wastewater. The wastewater pipe connects to frequently used water facilities such as the vegetable washing sink, mop sink, and toilet, where water quality requirements are not high. While using water for daily meals, it also removes impurities from the wastewater. The impurity content in the wastewater is much higher than that of tap water, but it fully meets the standards for general domestic use.

[0043] The backwashing mechanism of the water purification device is as follows: Open the valves of frequently used water appliances such as the kitchen sink, mop sink, and toilet connected to the wastewater pipe; open the inlet control valve 102 of the ultrafiltration membrane water purifier 1; close the purification water control valve 223 of the purification water channel 124; open the wastewater discharge control valve 232 of the ultrafiltration membrane water purifier 2; close the pre-filter wastewater outlet control valve 407 of the pre-filter 4; close the wastewater discharge control valve 132 of the ultrafiltration membrane water purifier 1; and close the inlet control valve 202 of the water purifier 2. The ultrafiltration membrane water purifier 2 is in a water-off state, while the ultrafiltration membrane water purifier 1 is in a purification water state. The purified water produced by the ultrafiltration membrane water purifier 1 is reversed through the purification water pipe 106. The purified water enters the purified water cavity 304 of the ultrafiltration membrane water purifier 2. Under the action of water pressure, the purified water enters the inner cavity of the filter element 303 from the outer cavity. Under the action of the reverse water flow, the viscous impurities accumulated on the inner wall of the filter element and the impurities clogging the micropores of the filter element membrane are flushed away. The flushed impurities flow along the inner cavity of the filter element to the wastewater cavity 306 of the water purifier. The wastewater containing impurities is discharged into the wastewater pipe 235 through the wastewater discharge control valve 232. During this process, the wastewater discharge control valve 232 needs to be closed and opened two or three times. The backwashing time lasts about 3-5 minutes to complete the backwashing of the filter element of the internal pressure ultrafiltration membrane water purifier 2.

[0044] Backwashing of filter element 1 of ultrafiltration membrane water purifier is performed by referring to the backwashing procedure for filter element 2 of ultrafiltration membrane water purifier. Simply close or open the corresponding inlet control valve and wastewater control valve to complete the backwashing of filter element 1. For water purification devices with multiple ultrafiltration membrane water purifiers connected in parallel, the same procedure applies. By closing or opening the corresponding inlet control valve and wastewater control valve, backwashing of all ultrafiltration membrane water purifier filter elements can be completed one by one.

[0045] The technology of using purified water generated by one ultrafiltration membrane water purifier to backwash the filter element of another ultrafiltration membrane water purifier, combined with the technology of continuous sewage discharge, ensures that the 0.01μm capillary micropores on the membrane wall of the ultrafiltration membrane element are always in a clear and clean state. This greatly extends the service life of the ultrafiltration membrane filter element. Even in environments with poor water quality, if the system is properly maintained, the service life of the ultrafiltration membrane water purifier filter element can reach at least ten years.

[0046] The cleaning mechanism of the pre-filter: After closing the wastewater discharge valves 132 and 232 of the ultrafiltration membrane water purifiers 1 and 2, the wastewater discharge control valve 407 of the pre-filter 4 changes from being open 1 / 4 to being fully open. The tap water entering the purified water cavity 404 of the pre-filter 4 flows quickly over the surface of the stainless steel filter screen 405 of the pre-filter 4. The resulting vortex water flow quickly carries away the viscous impurities adhering to the surface of the stainless steel filter screen, which are then quickly discharged into the wastewater discharge channel through the fully open wastewater discharge control valve 407. The cleaning of the pre-filter takes about 2 minutes to clean the stainless steel filter screen. After cleaning, the wastewater discharge control valve 407 of the pre-filter 4 is switched back to the normal purified water position of being open 1 / 4.

[0047] Embodiment 2 of this utility model:

[0048] Please see Figures 4-5 A high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions includes an ultrafiltration membrane water purifier 1, an ultrafiltration membrane water purifier 2, and a pre-filter 4. Ultrafiltration membrane water purifiers 1 and 2 are external pressure type ultrafiltration membrane water purifiers. The stainless steel casing of the external pressure ultrafiltration membrane water purifiers has a one-button clamp-type detachable structure. The upper part of the ultrafiltration membrane water purifier is the purified water outlet, the middle part is the water inlet, and the end is the wastewater outlet. Ultrafiltration membrane water purifiers 1 and 2 are connected in parallel. The ultrafiltration membrane water purifiers 1 and 2 are equipped with inlet control valves 102 and 202 respectively. Inlet tees 103 and 203 are respectively provided on the outside of the inlet control valves 102 and 202. The inlet tees 103 and 203 are connected by a union 106 to form an inlet channel 105. The inlet channel 105 is located in the middle of the water purifier. The outlet 401 of the pre-filter 4 is connected to the inlet tees 103 by a union 104 to form a tap water inlet channel. The other side of the inlet tees 203 is sealed with a plug 204.

[0049] The external pressure ultrafiltration membrane water purifiers 1 and 2 have sewage discharge control valves 132 and 232 at their sewage discharge outlets 131 and 231, respectively. Sewage discharge tees 133 and 233 are respectively provided on the outside of the sewage discharge control valves 132 and 232. The sewage discharge tees 133 and 233 are connected by a union 234 to form a sewage discharge pipe 235. The sewage discharge pipe 235 is located at the bottom of the water purifier. The pre-filter sewage discharge control valve 407 of the pre-filter 4 is connected to the sewage discharge tees 133 by a sewage discharge hose 408 to form a common sewage discharge pipe 235.

[0050] The mechanism of the tap water purification process of this device is as follows: Open the inlet control valves 102 and 202 of the ultrafiltration membrane water purifiers 1 and 2, open the wastewater discharge valves 132 and 232 of the ultrafiltration membrane water purifiers 1 and 2, open the purified water control valve 223, and open the wastewater discharge control valve 407 of the pre-filter 4 to the 1 / 5-1 / 4 position to achieve a balanced wastewater discharge between the pre-filter and the ultrafiltration membrane water purifier. Tap water enters the outer cavity 404 of the pre-filter 4 through the inlet 402. Under pressure, the tap water passes through a stainless steel filter screen 405 with a precision of 40μm, filtering out impurities with a particle diameter greater than 40μm. The tap water then enters the inlet pipe 105 through the outlet 401 of the pre-filter, and continues to enter the inlet cavity 301 of the ultrafiltration membrane water purifiers 1 and 2 through inlet control valves 102 and 202 respectively. Under water pressure, the tap water that has undergone primary filtration passes through an internal pressure ultrafiltration membrane with a precision of 0.01μm again. The filter elements 303 of water purifiers 1 and 2 filter out all impurities with a particle diameter greater than 0.01μm. The purified water is collected in the purified water cavity 301 and then enters the purified water pipe 105 through the purified water outlets 121 and 221. A purified water control valve 223 is provided on the outside of the purified water pipe 105. The purified water output pipe 224 is located on the outside of the purified water control valve 223. The purified water output pipe 224 is connected to water dispensers, purified water faucets in kitchen sinks, smart dishwashers, smart water heaters, smart washing machines, smart toilets and other equipment with high requirements for water quality.

[0051] Wastewater containing colloids, suspended solids, bacteria, algae, and other impurities with a particle diameter greater than 0.01μm accumulates in the wastewater cavity 306 and enters the wastewater discharge pipe 235 through wastewater discharge control valves 132 and 232. Wastewater containing impurities greater than 40μm filtered out by the stainless steel filter screen 405 of the pre-filter enters the wastewater discharge pipe 235 through the wastewater discharge control valve 407 and the wastewater discharge hose 408. The wastewater discharge pipe 235 is connected to frequently used equipment such as vegetable washing sinks, mop sinks, and toilets where water quality requirements are not high, so that wastewater can be discharged at any time, keeping the ultrafiltration membrane filter element clean at all times and extending the service life of the ultrafiltration membrane water purifier filter element.

[0052] The backwashing mechanism of the ultrafiltration membrane water purifier is as follows: Open the valves of frequently used water appliances such as the vegetable sink and mop sink connected to the wastewater discharge pipe 235; open the inlet control valve 102 of the ultrafiltration membrane water purifier 1; close the purification water control valve 223 of the purification water channel 124; open the wastewater discharge control valve 232 of the ultrafiltration membrane water purifier 2; close the pre-filter wastewater outlet control valve 407 of the pre-filter 4; close the wastewater discharge control valve 132 of the ultrafiltration membrane water purifier 1; and close the inlet control valve 202 of the water purifier 2. The ultrafiltration membrane water purifier 2 is in a water-off state, while the ultrafiltration membrane water purifier 1 is in a purification water state. The purified water produced by the ultrafiltration membrane water purifier 1 enters the purification water cavity 30 of the ultrafiltration membrane water purifier 2 through the purification water pipe 124. Inside filter 303, purified water flows out from the inner cavity to the outer cavity under water pressure. The reverse water flow washes away the viscous impurities accumulated on the outer wall of the filter element and the impurities clogging the micropores of the filter membrane. The washed-away impurities flow into the wastewater cavity 306 of the water purifier and accumulate. The wastewater containing impurities is discharged into the wastewater pipe 235 through the wastewater discharge control valve 232. During this process, the wastewater discharge control valve 232 is repeatedly closed and opened two or three times, causing changes in the pressure difference between the inner and outer cavities of filter 303, further thoroughly washing away the impurities clogging the micropores of the filter membrane. The backwashing time lasts about 3-5 minutes, which completes the entire backwashing process of filter element 2 of the ultrafiltration membrane water purifier.

[0053] Backwashing of filter element 1 of ultrafiltration membrane water purifier is performed by referring to the backwashing procedure for filter element 2 of ultrafiltration membrane water purifier. Simply close or open the corresponding inlet control valve and wastewater control valve to complete the backwashing of filter element 1. For water purification devices with multiple ultrafiltration membrane water purifiers connected in parallel, the same procedure applies. By closing or opening the corresponding inlet control valve and wastewater control valve, backwashing of all ultrafiltration membrane water purifier filter elements can be completed one by one.

[0054] The cleaning mechanism of the pre-filter: When the sewage discharge valves 132 and 232 of the ultrafiltration membrane water purifiers 1 and 2 are closed, the sewage discharge control valve 407 of the pre-filter 4 changes from being open 1 / 4 to being fully open. The tap water entering the purified water cavity 404 of the pre-filter 4 flows quickly over the surface of the stainless steel filter screen 405 of the pre-filter 4. The resulting vortex water flow carries away the viscous impurities adhering to the surface of the stainless steel filter screen and is quickly discharged into the sewage discharge channel through the fully open sewage discharge control valve 407.

[0055] Embodiment 3 of this utility model:

[0056] Please see Figures 6-7A high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions is composed of two or more pre-filters and two or more ultrafiltration membrane water purifiers. It includes a pre-filter 101, a pre-filter 201, an ultrafiltration membrane water purifier 1, and an ultrafiltration membrane water purifier 2. Ultrafiltration membrane water purifiers 1 and 2 are external pressure type ultrafiltration membrane water purifiers. The stainless steel casing of the external pressure type ultrafiltration membrane water purifier has a one-button clamp-type detachable structure. The upper part of the ultrafiltration membrane water purifier is the purified water outlet, the middle part is the water inlet, and the end is the wastewater outlet. Ultrafiltration membrane water purifiers 1 and 2 are connected in parallel. In this configuration, inlet control valves 104 and 204 are respectively installed on the outside of the inlet ports of pre-filters 101 and 201. Inlet tees 103 and 203 are installed on the outside of the inlet control valves 104 and 204. Inlet tees 103 and 203 are connected by a union 118 to form an inlet channel 119. One side of the inlet tee 103 is connected to the tap water inlet pipe 102 to form a tap water inlet channel. The other side of the inlet channel, tee 203, is sealed with a plug 202. The outlets 308 of pre-filters 101 and 201 are respectively connected to the inlet ports 305 of ultrafiltration membrane water purifiers 1 and 2 through unions 306 to form an inlet channel.

[0057] Sewage control valves 111 and 211 are respectively provided on the outside of the sewage outlets 112 and 212 of the ultrafiltration membrane water purifiers 1 and 2. Sewage tees 110 and 210 are respectively provided on the outside of the sewage control valves 111 and 211. The sewage tees 110 and 210 are connected by a union 112 to form a sewage channel 123 of the water purifier. The sewage channel 123 is located at the bottom of the water purifier. Sewage control valves 107 and 207 are provided on the outside of the sewage outlets 106 and 206 of the pre-filters 101 and 201. Sewage tees 108 and 208 are provided on the outside of the sewage control valves 107 and 207. The sewage tees 108 and 208 are connected by a union 121 to form a sewage channel 120 of the pre-filters 101 and 201. The sewage channels 120 and 123 are connected by a sewage hose 109 to form a common sewage pipe 217.

[0058] The mechanism of the tap water purification process in this device is as follows: Tap water enters the tap water channel 119 through the tap water pipe 102, and then enters the inlet cavity 309 of the pre-filters 101 and 201 through the inlet tees 103 and 203, the inlet control valves 104 and 204, and the inlet 105. Under pressure, the tap water passes through the stainless steel filter screen 310 of the pre-filters 101 and 201 with a precision of 40μm, filtering out impurities with a particle diameter greater than 40μm. The water then enters the inlet cavity 304 of the ultrafiltration membrane water purifiers 1 and 2 through the outlet 308 of the pre-filters 101 and 201 and the inlet 305 of the ultrafiltration membrane water purifier. Under the pressure of tap water, the water passes through the filter element 303 of the ultrafiltration membrane water purifiers 1 and 2 with a precision of 0.01μm, filtering out all impurities with a particle diameter greater than 0.01μm. The purified water then enters the ultrafiltration membrane water purification cavity 301 and accumulates. It then enters the purified water pipe 116 through the purified water tee 115 and 215. The purified water pipe 116 is equipped with a purified water control valve 213. The outside of the purified water control valve 213 is the purified water output pipe 216. The purified water output pipe 216 is connected to water dispensers, purified water faucets for kitchen sinks, smart dishwashers, smart water heaters, smart washing machines, smart toilets, and other devices with high requirements for water quality.

[0059] Wastewater containing impurities larger than 40μm filtered by the stainless steel filter screen 310 of pre-filters 101 and 201 is discharged through the wastewater discharge control valves 107 and 207 of the pre-filters and enters the wastewater discharge pipe 120. Wastewater containing impurities with a particle diameter larger than 0.01μm filtered by the ultrafiltration membrane water purifier accumulates in the wastewater cavity 307 of the ultrafiltration membrane water purifier and is discharged into the wastewater discharge pipe 123 through the wastewater discharge control valves 111 and 211. The wastewater is then collected into the common wastewater discharge pipe 217 through the wastewater discharge hose. The common wastewater discharge pipe 217 is connected to frequently used equipment such as vegetable washing sinks, mop sinks, and toilets where water quality requirements are not high, so that wastewater can be discharged at any time, keeping the ultrafiltration membrane filter element clean at all times and extending the service life of the ultrafiltration membrane water purifier filter element.

[0060] The backwashing mechanism of the ultrafiltration membrane water purifier is as follows: First, the filter element of the ultrafiltration membrane water purifier 2 is backwashed. Then, the valves of frequently used water-using equipment such as the vegetable sink and mop sink connected to the wastewater discharge pipe 217 are opened. The purification water control valve 213 of the purification water channel is closed, as are the wastewater discharge control valves 107 and 207 of the pre-filter 101, the ultrafiltration membrane water purifier 1's wastewater discharge control valve 111, and the pre-filter 201's inlet control valve 204. The ultrafiltration membrane water purifier 2's wastewater discharge control valve 211 and the pre-filter 101's inlet control valve 104 are then opened. The ultrafiltration membrane water purifier 1 is in the water-inlet state, while the ultrafiltration membrane water purifier 2 is in the water-off state. The purified water generated by the ultrafiltration membrane water purifier 1 is backwashed through the purification water pipe 116. The purified water enters the purification chamber 301 of the ultrafiltration membrane water purifier 2. Under water pressure, the purified water flows backward from the inner cavity of the filter element 303 to the outer cavity of the filter element. This reverse flow washes away the viscous impurities accumulated on the outer wall of the filter element and the impurities clogging the micropores of the filter membrane fibers. The wastewater containing impurities collects in the wastewater chamber 307 of the ultrafiltration membrane water purifier 2 and is discharged into the wastewater pipe 123 through the wastewater control valve 211. During this process, the wastewater control valve 211 is repeatedly closed and opened two or three times, causing pressure differences between the inner and outer cavities of the filter element 303. This further thoroughly washes away the impurities clogging the micropores of the filter membrane fibers. The backwashing time is approximately 3-5 minutes, thus completing the backwashing process of the filter element of the ultrafiltration membrane water purifier 2. The backwashing procedure for the filter element of the ultrafiltration membrane water purifier 1 is the same as that for the filter element of the ultrafiltration membrane water purifier 2, and will not be described in detail here.

[0061] For backwashing of water purification devices with multiple parallel ultrafiltration membrane water purifiers 1, 2, 3, 4, the backwashing operation procedure of ultrafiltration membrane water purifiers 1 and 2 is the same. By closing or opening the corresponding inlet control valve and the wastewater control valve, the backwashing of all ultrafiltration membrane water purifier filter elements can be completed one by one.

[0062] The cleaning mechanism of stainless steel filter screen 310 of pre-filter 201 is as follows: Open the inlet control valves 104 and 204 of the pre-filter, close the drain valves 111 and 211 of the ultrafiltration membrane water purifiers 1 and 2, close the drain control valve 111 of pre-filter 101, open the drain control valve 211 of pre-filter 201, and the tap water entering the inlet cavity 309 of pre-filter 2 flows quickly over the surface of stainless steel filter screen 310 of pre-filter 201. The resulting vortex water flow carries away the viscous impurities adhering to the surface of the stainless steel filter screen and quickly enters the drain channel through the fully opened drain control valve 211. The rinsing process needs to be maintained for about 2 minutes to complete the cleaning procedure of stainless steel filter screen 310 of pre-filter 201. The cleaning procedure of stainless steel filter screen 301 of pre-filter 101 is the same as that of pre-filter 201, and will not be described in detail here.

[0063] After each ultrafiltration membrane water purifier has completed backwashing, open the inlet control valves 104 and 204 of the pre-filters 101 and 201, open the wastewater control valves 111 and 211 of the ultrafiltration membrane water purifiers 1 and 2, and open the wastewater control valves 107 and 207 of the pre-filters 101 and 201 to 1 / 4 open, and the water purifier enters the normal water purification state.

[0064] The backwashing cycle is determined by the quality of tap water and the amount of purified water. Typically, the backwashing cycle for household water purifiers is one to two months. For commercial, office, and hotel establishments, the backwashing cycle is determined based on changes in the amount of purified water. Backwashing should be performed promptly when a significant decrease in the amount of purified water is observed.

[0065] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions, characterized in that: It includes a pre-filter and two or more ultrafiltration membrane water purifiers connected in parallel. The inlet of each ultrafiltration membrane water purifier is equipped with an inlet control valve. The outside of each inlet control valve is equipped with an inlet tee. The inlet tees are connected by a union to form an inlet channel. The outlet of the pre-filter is connected to the inlet tee of the water purifier by a union to form a complete tap water inlet channel.

2. The high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions according to claim 1, characterized in that: Two or more ultrafiltration membrane water purifiers connected in parallel each have a purified water outlet tee. The purified water outlet tees are connected by a union to form a purified water channel, and the purified water cavities of the two ultrafiltration membrane water purifiers are interconnected. A purified water control valve is provided on the outside of the purified water channel.

3. The high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions according to claim 2, characterized in that: The ultrafiltration membrane water purifier is equipped with a wastewater discharge control valve at its wastewater discharge outlet. A wastewater discharge tee is installed on the outside of each wastewater discharge control valve. The wastewater discharge tees are connected by a union to form a wastewater discharge channel. The wastewater discharge outlet of the pre-filter is equipped with a wastewater discharge control valve. The wastewater discharge control valve is connected to the wastewater discharge tee by a hose to form a common wastewater discharge channel. The wastewater discharge channel is connected to the frequently used sinks for washing vegetables, washing mops, and toilet facilities.

4. The high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions according to claim 3, characterized in that: The purification water cavities of two or more ultrafiltration membrane water purifiers are interconnected. By closing or opening the corresponding inlet control valve and outlet control valve of the ultrafiltration membrane water purifier, the purified water generated by one ultrafiltration membrane water purifier is used to backwash the filter element of another ultrafiltration membrane water purifier. The backwashing of the filter element of the ultrafiltration membrane water purifier is carried out alternately between two or more ultrafiltration membrane water purifiers.

5. The high-flow-rate ultrafiltration membrane water purification device with self-cleaning and backwashing functions according to claim 4, characterized in that: Ultrafiltration membrane water purifiers can be either internal pressure ultrafiltration membrane water purifiers or external pressure ultrafiltration membrane water purifiers.

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