Integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device

Abstract

The utility model discloses an integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device, which belongs to the technical field of filters and comprises a filtering water tank, the filtering water tank comprises a main water tank and an auxiliary water tank, a plurality of ultrafilters are arranged in the main water tank, the auxiliary water tank and the main water tank are equal in length, and the ultrafilters are arranged in the auxiliary water tank. A water inlet pipe and a water outlet pipe are respectively arranged at two ends along the length direction of the main water tank; the auxiliary water tank is provided with an auxiliary water inlet pipe, a plurality of communicating channels are arranged between the main water tank and the auxiliary water tank in the length direction of the main water tank, and a pressure regulating valve is arranged in each communicating channel; and when the pressure of the main water tank is smaller than that of the auxiliary water tank, the pressure regulating valve is opened. By adopting the double-water-tank arrangement, water can be supplemented from the auxiliary water tank in time when the pressure of the main water tank is reduced, so that the pressure difference between the two sides of the ultrafiltration membrane can be maintained at a relatively high value, and the filtering efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting lamps and lanterns technical field especially, it relates to a kind of integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device. BACKGROUND

[0002] Integrated ultrafiltration membrane direct drinking water technology is a kind of technology using macromolecule ultrafiltration membrane to remove impurities in water, reaches direct drinking water standard, after long-term use, many small impurities are easily attached to the outside of ultrafiltration membrane, affect the filtration efficiency of ultrafiltration membrane, purification and self-cleaning integrated design is particularly important, by integrated design, after using a period of time, self-cleaning of equipment can be automatically completed in idle time at night, so that ultrafiltration membrane can maintain high filtration efficiency for a long time.Ultrafiltration membrane purifier of prior art generally adopts negative pressure suction mode, after cleaning, filtration efficiency is greatly improved, and water supply may be insufficient.

[0003] The existing water tank is generally designed as a single body, and only has a main water tank. When the water in the main water tank decreases, the internal pressure of the water tank decreases, the pressure difference between the two sides of the ultrafiltration membrane decreases, and the filtration efficiency of the ultrafiltration membrane is affected when the pressure is unbalanced. SUMMARY

[0004] In view of the above problems, the utility model aims at solving the above described problems. One object of the utility model is to provide an integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device to solve the above problems.

[0005] The scheme adopted by the embodiment is: an integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device, comprising a filtered water tank, the filtered water tank comprises a main water tank and an auxiliary water tank, a plurality of ultrafiltration filters are arranged in the main water tank, the auxiliary water tank and the main water tank are equal in length, and a water inlet pipe and a water outlet pipe are arranged at two ends along the length direction of the main water tank; the auxiliary water tank is provided with an auxiliary water inlet pipe, a plurality of communication channels are arranged between the main water tank and the auxiliary water tank along the length direction of the main water tank, and a pressure regulating valve is arranged in each communication channel; when the pressure of the main water tank is less than the pressure of the auxiliary water tank, the pressure regulating valve is opened.

[0006] The preferred technical solution is that a backflushing pipe is further included, the backflushing pipe is located in the main water tank, the backflushing pipe is arranged along the vertical direction, the water outlet pipe is connected with the water outlet ends of all the ultrafiltration filters, the backflushing pipe also communicates with the side wall of the water outlet pipe, and a flushing valve is arranged on the backflushing pipe.

[0007] The preferred technical scheme is characterized in that the water outlet end of the water outlet pipe is communicated with the negative pressure water purification tank, a water outlet valve is arranged at the connection position of the negative pressure water purification tank and the water outlet pipe, the water outlet valve is opened when normal water purification is performed, and the water outlet valve is closed when backwashing is performed.

[0008] The preferred technical scheme is characterized in that the high-pressure air tank is connected to the side wall of the water outlet pipe, and an air outlet valve is arranged at the air outlet end of the high-pressure air tank, the air outlet valve is closed when normal water purification is performed, and the air outlet valve is opened when backwashing is performed.

[0009] The preferred technical scheme is characterized in that the ultrafilters are arranged at intervals, a steady flow channel is arranged between two adjacent ultrafilters, the backwashing pipe is arranged in the steady flow channel, and flushing holes are arranged on both sides of the backwashing pipe and face the ultrafilters on both sides.

[0010] The preferred technical scheme is characterized in that a drain pipe is arranged at the bottom side wall of the main water tank, and a drain valve is arranged on the drain pipe.

[0011] The preferred technical scheme is characterized in that the pressure regulating valve comprises a communication pipe, a contraction portion is arranged at one end of the communication pipe in the auxiliary water tank, a water outlet portion is arranged at one end of the communication pipe in the main water tank, and the diameter of the water outlet portion is greater than the diameter of the contraction portion.

[0012] The preferred technical scheme is characterized in that a compression spring and a sealing plug are arranged in the water outlet portion, one end of the compression spring is fixedly connected to the water outlet portion, the other end of the compression spring is fixedly connected to the sealing plug, the sealing plug is slidably connected to the water outlet portion, and the sealing plug blocks the contraction portion in an initial state.

[0013] The preferred technical scheme is characterized in that an end cap is arranged at the end of the water outlet portion, one end of the compression spring is fixedly connected to the end cap, a plurality of long slits are arranged on the side wall of the water outlet portion, and when the pressure of the main water tank is less than the pressure of the auxiliary water tank, the sealing plug moves towards the end cap, and water enters the main water tank from the long slits.

[0014] The preferred technical scheme is characterized in that the height of the auxiliary water tank is greater than that of the main water tank, the pressure regulating valve is arranged at the upper edge of the ultrafilter, and the water level of the auxiliary water tank is higher than that of the main water tank in a normal state.

[0015] Compared with the prior art, the integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device has the following technical effects:

[0016] 1. The integrated ultrafiltration membrane direct drinking water purifying and self-cleaning integrated device of the application, comprising a filtered water tank, the filtered water tank comprising a main water tank and a secondary water tank, a plurality of ultrafilters being arranged in the main water tank, the secondary water tank and the main water tank being equal in length, a water inlet pipe and a water outlet pipe being arranged at both ends of the main water tank along the length direction of the main water tank; the secondary water tank is provided with a secondary water inlet pipe, a plurality of communication channels being arranged between the main water tank and the secondary water tank along the length direction of the main water tank, a pressure regulating valve being arranged in each communication channel; when the pressure of the main water tank is less than the pressure of the secondary water tank, the pressure regulating valve is opened. The double-tank arrangement can timely supplement water from the secondary water tank when the pressure of the main water tank decreases, so that the pressure difference on both sides of the ultrafiltration membrane can be maintained at a high value, and the filtration efficiency is improved.

[0017] The following description of exemplary embodiments will be read in connection with the accompanying drawings, in which other characteristic features and advantages of the application will become clear. DETAILED DESCRIPTION

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings, like reference numerals are used to represent like elements. The accompanying drawings are some embodiments of the application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0019] Figure 1 is a front overall structure schematic diagram of the integrated ultrafiltration membrane direct drinking water purifying and self-cleaning integrated device provided in the specific embodiment of the application;

[0020] Figure 2 is a rear side structure schematic diagram of the integrated ultrafiltration membrane direct drinking water purifying and self-cleaning integrated device provided in the specific embodiment of the application;

[0021] Figure 3 is a filtered water tank internal section structure schematic diagram provided in the specific embodiment of the application;

[0022] Figure 4 is a Figure 3 enlarged structure schematic diagram of part A;

[0023] Figure 5 is a Figure 3 enlarged structure schematic diagram of part B;

[0024] In the drawings:

[0025] 1, filter water tank; 101, main water tank; 102, auxiliary water tank; 2, backwash pipe; 4, pressure regulating valve; 5, ultrafilter; 6, high-pressure air tank; 7, negative pressure water tank; 12, steady flow channel; 13, drain pipe; 131, drain valve; 14, water inlet pipe; 141, water inlet valve; 15, auxiliary water inlet pipe; 151, water supplement valve; 21, flushing valve; 22, flushing hole; 61, exhaust valve; 71, water outlet valve; 72, water outlet pipe; 41, communication pipe; 411, contraction part; 412, water outlet part; 42, compression spring; 43, sealing plug; 44, end cap; 45, long slot. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0027] The integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device will be described in detail below in combination with the drawings and embodiments.

[0028] As Figures 1-5As shown, the utility model provides a kind of integrated ultrafiltration membrane direct drinking water purification and self-cleaning integrated device, it is the equipment of integrated ultrafiltration membrane filtration and automatic cleaning, the water that it produces can reach the standard of direct drinking water, it includes filter water tank 1.Filter water tank 1 includes main water tank 101 and auxiliary water tank 102, main water tank 101 is provided with several ultrafilters 5, auxiliary water tank 102 and main water tank 101 are equal length, along the length direction of main water tank 101, water inlet pipe 14 and outlet pipe 72 are respectively arranged at both ends.Well-known long cuboid shape ultrafiltration membrane filter of large equipment in market is used for ultrafilter 5, several ultrafiltration membrane filter element is integrated into long cuboid shape, and all the water outlet ends of ultrafiltration membrane filter element are connected to outlet pipe 72, and fixed frame and other structures are arranged outside the ultrafiltration membrane filter element.The ultrafilter 5 is prior art, and will not be described here again.Main water tank 101 and auxiliary water tank 102 are equal length design, to make the water of auxiliary water tank 102 can be replenished from multiple positions in the middle to main water tank 101, ensure the stability when replenishing.Water inlet pipe 14 and outlet pipe 72 are arranged along the length direction of main water tank 101, water inlet valve 141 is arranged on water inlet pipe 14, water can be replenished from water inlet pipe 14 into main water tank 101, and after filtration by ultrafilter 5, water flows out from outlet pipe 72, to realize the orderly water flow path, improve filtration efficiency.The principle is to use the flow characteristics of water flow in a specific path, water is stationary in main water tank 101, so that water can be fully contacted with ultrafilter 5, to complete the filtration process.This design ensures the stable flow of water in the device, ensures the consistency of filtration effect, improves the filtration quality and efficiency of the whole water purification device.

[0029] Auxiliary water tank 102 is provided with water replenishing valve 151, water replenishing valve 151 is arranged on water replenishing valve 151, along the length direction of main water tank 101, main water tank 101 and auxiliary water tank 102 are provided with several communication channels, and pressure regulating valve 4 is arranged in each communication channel;when the pressure of main water tank 101 is less than the pressure of auxiliary water tank 102, pressure regulating valve 4 opens.A plurality of communication channels are arranged to provide multiple water exchange channels between main water tank 101 and auxiliary water tank 102, to ensure that water can flow quickly and uniformly between the two tanks during pressure regulation.The role of pressure regulating valve 4 is to control the on-off of water flow according to the pressure difference between main water tank 101 and auxiliary water tank 102.When the pressure of main water tank 101 is less than the pressure of auxiliary water tank 102, pressure regulating valve 4 opens, so that water in auxiliary water tank 102 can enter main water tank 101, to maintain the stability of the pressure and liquid level in main water tank 101.The principle is based on the principle of fluid pressure balance, and the action of pressure regulating valve 4 is triggered by pressure difference.The design can automatically adjust the pressure balance between main water tank 101 and auxiliary water tank 102, to ensure that the device can operate stably under various working conditions, and avoid the problem of reduced filtration efficiency caused by pressure imbalance.

[0030] In order to achieve high efficiency self-cleaning, also includes backwash pipe 2, backwash pipe 2 is located in the main water tank 101, backwash pipe 2 is arranged along the vertical direction, the outlet pipe 72 is connected with the outlet end of all ultrafiltration 5, backwash pipe 2 is also communicated with the side wall of the outlet pipe 72, and the backwash pipe 2 is provided with a washing valve 21. The backwash pipe 2 is vertically arranged in the main water tank 101, and the layout can make the backwash gas flow or water flow more uniformly distributed to each part needing washing under the assistance of gravity. The outlet pipe 72 is connected with the outlet end of all ultrafiltration 5, which is used to collect filtered water. The backwash pipe 2 is communicated with the side wall of the outlet pipe 72, which is convenient for introducing clean water into the backwash pipe 2 during backwashing. The washing valve 21 controls the start and end of the backwashing process. Its principle is to use the backwash pipe 2 to introduce clean water into the ultrafiltration 5 in the opposite direction, and use the water flow to remove the impurities on the surface of the ultrafiltration 5. The beneficial effect is that through the backwashing function, the pollutants on the surface of the ultrafiltration 5 can be effectively removed, the filtering performance of the ultrafiltration 5 is restored, the service life of the ultrafiltration 5 is prolonged, and the maintenance cost of the equipment is reduced.

[0031] In order to facilitate the storage of purified water, a negative pressure water tank 7 is further included, the outlet end of the outlet pipe 72 is communicated with the negative pressure water tank 7, and the negative pressure water tank 7 is provided with an outlet valve 71 at the connection position of the outlet pipe 72. When normal water purification work is performed, the outlet valve 71 is opened, and when backwashing is performed, the outlet valve 71 is closed. The negative pressure water tank 7 is arranged to store filtered clean water, and at the same time, the negative pressure characteristics are used to assist the water flow and the filtering process to a certain extent. The outlet pipe 72 is communicated with the negative pressure water tank 7, so that the filtered water can smoothly enter the negative pressure water tank 7. The outlet valve 71 is used to switch the water flow path in the two states of normal water purification work and backwashing. When normal water purification work is performed, the outlet valve 71 is opened, and water can normally flow into the negative pressure water tank 7; when backwashing is performed, the outlet valve 71 is closed, so as to prevent the backwashing water from entering the negative pressure water tank 7 and causing pollution. Its principle is based on the control of the valve on the water flow channel, and the water flow direction is changed by opening or closing the outlet valve 71. The beneficial effect is that this design can ensure stable storage of filtered water during normal water purification work, avoid pollution to the water tank during backwashing, and improve the operation reliability and water quality safety of the whole device.

[0032] In order to make the cleaning effect better, the bubble flow cleaning technology is introduced in the scheme, and a high-pressure air tank 6 is further included. The air outlet end of the high-pressure air tank 6 is connected to the side wall of the water outlet pipe 72, and the air outlet end of the high-pressure air tank 6 is provided with an exhaust valve 61. When the normal water purification work is performed, the exhaust valve 61 is closed, and when the backwashing is performed, the exhaust valve 61 is opened. The high-pressure air tank 6 provides high-pressure air during backwashing, assists the backwashing process, and enhances the cleaning effect on the ultrafilter 5. The air outlet end is connected to the side wall of the water outlet pipe 72, because the water outlet pipe 72 is the channel of the backwashing water flow, and the high-pressure air is introduced into the water outlet pipe 72, so that it can be fully mixed with the backwashing water, and a gas-water mixed washing effect is formed. It can also realize separate air flow washing and separate water flow washing. The exhaust valve 61 is used to control the discharge of high-pressure air. When the normal water purification work is performed, the exhaust valve 61 is closed to prevent high-pressure air from entering and affecting normal filtration. When backwashing is performed, the exhaust valve 61 is opened to allow high-pressure air to smoothly enter the water outlet pipe 72. The principle is to use the impact force of high-pressure air and the stirring action of bubbles to more effectively remove impurities on the surface of the ultrafilter 5. The beneficial effect is that the introduction of high-pressure air to assist backwashing greatly improves the cleaning effect of backwashing, and can more completely remove stubborn pollutants on the ultrafilter 5, further improving the filtration performance and service life of the ultrafilter 5.

[0033] In order to make the filtration more stable, the ultrafilters 5 are arranged at intervals, and a stable flow channel 12 is arranged between the two adjacent ultrafilters 5. The backwashing pipe 2 is located in the stable flow channel 12, and the backwashing pipe 2 is provided with washing holes 22 on both sides, and the washing holes 22 are arranged towards the ultrafilters 5 on both sides. The ultrafilters 5 are arranged at intervals to form a stable flow channel 12 between the ultrafilters 5. The stable flow channel 12 can make the water flow more stable in the main water tank 101, reduce the turbulence and impact of the water flow, and ensure the stability of the filtration process. The backwashing pipe 2 is located in the stable flow channel 12, which is convenient for uniform washing of the ultrafilters 5 on both sides. The backwashing pipe 2 is provided with washing holes 22 on both sides, and the washing holes 22 are arranged towards the ultrafilters 5 on both sides, so that the backwashing water or bubbles can be directly sprayed to the surface of the ultrafilters 5 during backwashing, and high-efficiency washing is realized. The principle is to make the water flow and backwashing water flow play a role in a stable environment through reasonable layout design, and improve the filtration and backwashing effect. This design optimizes the path of the water flow and the backwashing water flow, improves the filtration and backwashing efficiency, makes the whole device more stable and efficient during operation, and ensures the stable output of water quality.

[0034] The preferred technical scheme is that the bottom side wall of the main water tank 101 is provided with a drain pipe 13, and the drain pipe 13 is provided with a drain valve 131. The main water tank 101 is provided with the drain pipe 13, so that the water in the main water tank 101 can be conveniently drained when needed, for example, during equipment maintenance, replacement of filter elements, or long-term inactivity, and during backwashing cleaning. The drain valve 131 is used to control the opening and closing of the drain pipe 13, and when water needs to be drained, the drain valve 131 is opened; when water does not need to be drained, the drain valve 131 is closed. The principle is to control the drainage channel through the valve to achieve the drainage operation of the water in the main water tank 101. The setting of the drain pipe 13 facilitates the maintenance and management of the equipment, can timely drain the sewage and impurities in the main water tank 101, ensure the cleanliness of the inside of the device, and prepare for the next normal operation, and at the same time prolong the service life of the equipment.

[0035] Regarding a simple scheme of the pressure regulating valve 4, the pressure regulating valve 4 includes a communication pipe 41, the communication pipe 41 is provided with a contraction part 411 at one end of the auxiliary water tank 102, the communication pipe 41 is provided with a water outlet part 412 at one end of the main water tank 101, and the diameter of the water outlet part 412 is larger than that of the contraction part 411. The structure design of the pressure regulating valve 4, the contraction part 411 at one end of the auxiliary water tank 102 can increase the resistance of water flow into the communication pipe 41, and the diameter of the water outlet part 412 at one end of the main water tank 101 is larger than that of the contraction part 411, which can make the water pressure release and stabilize to a certain extent when entering the main water tank 101. The principle is based on the pressure and flow rate variation law of fluid under different pipe diameters, and the water pressure is adjusted by changing the pipe diameter. The beneficial effect is that this design can more accurately control the pressure difference between the main water tank and the auxiliary water tank 102, make the pressure regulation more stable and accurate, avoid the impact on the equipment due to pressure mutation, and improve the stability and reliability of the pressure regulation. Further, the water outlet part 412 is provided with a compression spring 42 and a sealing plug 43, one end of the compression spring 42 is fixedly connected with the water outlet part 412, the other end is fixedly connected with the sealing plug 43, the sealing plug 43 is slidably connected in the water outlet part 412, and the sealing plug 43 blocks the contraction part 411 in the initial state. The combination design of the compression spring 42 and the sealing plug 43 provides the sealing plug 43 with an initial sealing force, so that the sealing plug 43 can tightly block the contraction part 411 in the initial state, preventing water from flowing from the auxiliary water tank 102 into the main water tank 101 when not needed. The sealing plug 43 is slidably connected in the water outlet part 412, and when the pressure changes, the sealing plug 43 can slide in the water outlet part 412, thereby realizing the opening and closing of the pressure regulating valve 4. The principle is to utilize the balance relationship between the elastic force of the compression spring 42 and the water pressure, when the pressure of the main water tank 101 is less than that of the auxiliary water tank 102, the water pressure overcomes the spring force and pushes the sealing plug 43 to move. The beneficial effect is that this mechanical pressure regulating structure is simple and reliable, which can automatically realize pressure regulation without external energy, reduces the complexity and cost of the equipment, and at the same time ensures the timeliness and accuracy of the pressure regulation. Preferably, the end of the water outlet part 412 is provided with an end cap 44, one end of the compression spring 42 is fixedly connected with the end cap 44, and the side wall of the water outlet part 412 is provided with a plurality of long slits 45, when the pressure of the main water tank 101 is less than that of the auxiliary water tank 102, the sealing plug 43 moves towards the end cap 44, and water enters the main water tank 101 from the long slits 45. The end of the water outlet part 412 is provided with the end cap 44, which provides a fixed point for the compression spring 42 and ensures the stable installation of the compression spring 42. The long slits 45 on the side wall of the water outlet part 412 provide a channel for water to enter the main water tank 101 when the sealing plug 43 moves towards the end cap 44. When the pressure of the main water tank 101 is less than that of the auxiliary water tank 102, the sealing plug 43 moves, water flows into the main water tank 101 from the long slits 45, and the opening function of the pressure regulating valve 4 is realized.The principle is to change the water flow passage by moving the sealing plug 43, and to control the water flow and flow direction by using the long slot 45. The beneficial effect is that this design makes the structure of the pressure regulating valve 4 more reasonable, and the setting of the long slot 45 can ensure smooth water flow during pressure regulation, while automatically adjusting the water flow according to the size of the pressure difference, further improving the flexibility and accuracy of pressure regulation, and ensuring stable operation of the device under various working conditions.

[0036] In order to ensure that water can be supplied to the main water tank 101 during self-cleaning, the height of the auxiliary water tank 102 is greater than that of the main water tank 101, and the pressure regulating valve 4 is located at the upper edge of the ultrafiltration device 5. Under normal conditions, the water level of the auxiliary water tank 102 is higher than that of the main water tank 101.

[0037] The height of the auxiliary water tank 102 is greater than that of the main water tank 101, and the hydrostatic pressure generated by the height difference is used to keep the water level of the auxiliary water tank 102 relatively high under normal conditions, providing a certain pressure reserve for the main water tank 101. The pressure regulating valve 4 is located at the upper edge of the ultrafiltration device 5, so that it can respond more timely to the pressure change between the main and auxiliary water tanks 102. When the pressure of the main water tank 101 decreases due to filtration and other factors, the pressure regulating valve 4 can quickly open to supplement the water flow. Under normal conditions, the water level of the auxiliary water tank 102 is higher than that of the main water tank 101, so that there is enough water flowing from the auxiliary water tank 102 to the main water tank 101 when the pressure regulating valve 4 is opened. The principle is based on the principle of fluid statics, and the pressure difference generated by the height difference is used to drive the flow of water. This design makes full use of the natural height difference, reduces the consumption of additional energy, and ensures that the main water tank 101 can obtain stable water flow supplement under various working conditions, improving the stability and reliability of the entire device and reducing the operating cost.

[0038] It should be noted that in this document, relational terms such as first and second and the like can be 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. Moreover, the terms "comprises", "comprising", or any other variations 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0039] The above examples are only used to illustrate the technical solutions of the present application and are not limiting, and the present application has been described in detail only with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. An integrated device for direct drinking water purification and self-cleaning, characterized in that: it comprises a filter water tank, the filter water tank comprises a main water tank and a secondary water tank, a plurality of ultrafiltration filters are arranged in the main water tank, the secondary water tank is equal in length to the main water tank, and a water inlet pipe and a water outlet pipe are arranged at both ends of the main water tank along the length direction of the main water tank; the secondary water tank is provided with a secondary water inlet pipe, a plurality of communication channels are arranged between the main water tank and the secondary water tank along the length direction of the main water tank, and a pressure regulating valve is arranged in each communication channel; when the pressure of the main water tank is less than the pressure of the secondary water tank, the pressure regulating valve is opened.

2. The integrated device for direct drinking water purification and self-cleaning according to claim 1, characterized in that: it further comprises a backwashing pipe, the backwashing pipe is arranged in the main water tank, the backwashing pipe is arranged along the vertical direction, the water outlet pipe is connected with the water outlet ends of all the ultrafiltration filters, the backwashing pipe is in communication with the side wall of the water outlet pipe, and a flushing valve is arranged on the backwashing pipe.

3. The integrated device for direct drinking water purification and self-cleaning according to claim 2, characterized in that: it further comprises a negative pressure water purification tank, the water outlet end of the water outlet pipe is in communication with the negative pressure water purification tank, and a water outlet valve is arranged at the connection position of the negative pressure water purification tank and the water outlet pipe; when normal water purification is performed, the water outlet valve is opened, and when backwashing is performed, the water outlet valve is closed.

4. The integrated device for direct drinking water purification and self-cleaning according to claim 3, characterized in that: it further comprises a high-pressure air tank, the air outlet end of the high-pressure air tank is connected to the side wall of the water outlet pipe, and an air outlet valve is arranged at the air outlet end of the high-pressure air tank; when normal water purification is performed, the air outlet valve is closed, and when backwashing is performed, the air outlet valve is opened.

5. The integrated device for direct drinking water purification and self-cleaning according to claim 2, characterized in that: the ultrafiltration filters are arranged at intervals, a steady flow channel is arranged between two adjacent ultrafiltration filters, the backwashing pipe is arranged in the steady flow channel, flushing holes are arranged on both sides of the backwashing pipe, and the flushing holes are arranged towards the two adjacent ultrafiltration filters.

6. The integrated device for direct drinking water purification and self-cleaning according to claim 1, characterized in that: a drain pipe is arranged on the side wall of the bottom of the main water tank, and a drain valve is arranged on the drain pipe.

7. The integrated device for direct drinking water purification and self-cleaning according to claim 1, characterized in that: the pressure regulating valve comprises a communication pipe, a contraction portion is arranged at one end of the communication pipe in the secondary water tank, a water outlet portion is arranged at one end of the communication pipe in the main water tank, and the diameter of the water outlet portion is greater than the diameter of the contraction portion.

8. The integrated device for direct drinking water purification and self-cleaning according to claim 7, characterized in that: a compression spring and a sealing plug are arranged in the water outlet portion, one end of the compression spring is fixedly connected with the water outlet portion, the other end of the compression spring is fixedly connected with the sealing plug, the sealing plug is slidably connected in the water outlet portion, and in the initial state, the sealing plug blocks the contraction portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ 9. The integrated device of claim 8, wherein the outlet portion is provided with an end cap, one end of the compression spring is fixedly connected with the end cap, and the side wall of the outlet portion is provided with a plurality of long slits, when the pressure of the main water tank is less than the pressure of the auxiliary water tank, the sealing plug moves towards the end cap, and water enters the main water tank from the long slits.

10. The integrated device of claim 1, wherein the height of the auxiliary water tank is greater than that of the main water tank, the pressure regulating valve is located at the upper edge of the ultrafilter, and the water level of the auxiliary water tank is higher than that of the main water tank in normal state. ​ ​

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