Low-pressure water purification device based on ultrafiltration membrane technology

Abstract

The utility model provides a low-pressure water purification device based on an ultrafiltration membrane technology. A water purification cavity is formed in a shell; the filtering assembly comprises a barrel and a filtering piece arranged on the barrel, the barrel comprises a first fixing part, a connecting part and a second fixing part which are sequentially arranged, one end of the filtering piece is arranged on the connecting part, the other end of the filtering piece extends outwards, and the two opposite ends of the filtering piece abut against the first fixing part and the second fixing part respectively; the water inlet pipe is arranged on the side wall of the shell and partially extends into the water purification cavity, and the water inlet pipe directly faces the filtering piece; the length direction of the water purifying device is defined as a first direction, and the filtering piece is annularly arranged on the circumferential face of the connecting part in the first direction. According to the water purifying device, through the design that the water inlet pipe is arranged on the side wall of the shell and directly faces the filtering piece, the water inlet flow can enter in the direction perpendicular to the filtering piece, and the phenomenon that local water flow is too fast or too slow can be avoided when the water flow flows through the filtering membrane, so that more filtering surfaces are provided, and the filtering capacity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification, in particular to a low-pressure water purification device based on ultrafiltration membrane technology. BACKGROUND

[0002] With the enhancement of environmental protection consciousness and the technological progress in the field of water treatment, filtration technology has become an indispensable part in the industry. Filters remove impurities, pollutants, suspended solids, etc. in the fluid to ensure the quality of the fluid and the stable operation of the equipment. Traditional filter cartridges are widely used in various equipment, such as air purifiers, drinking water treatment, oil filtration, etc. They mainly filter through physical, chemical or charge effects. Filter cartridge materials usually include paper, activated carbon, fiber mesh, metal mesh, etc. The design of these filter cartridges is diverse, and the pore size and number of layers determine their filtration precision and flow rate.

[0003] Currently, the common filter design on the market adopts a wrapped structure, which wraps the membrane module in a surrounding way in a column or cylindrical shell. The water flow usually flows parallel to the membrane surface. When passing through the filter membrane, suspended solids, bacteria, heavy metals, etc. in the water are intercepted by the micropores of the membrane, thereby achieving the effect of water purification. Through the design of wrapping the column, the filter can increase the membrane surface area in a certain space, thereby improving its processing capacity.

[0004] However, the design of the wrapped filter cartridge usually has water flowing along the membrane surface. This flow pattern leads to uneven water distribution. During the filtration process, the water flow rate in some areas may be too fast, while in other areas it may be slower. In areas where the water flow is too fast, the membrane may quickly accumulate pollutants due to overload, resulting in a decrease in filtration capacity in local areas. Due to uneven water distribution, some areas of the wrapped filter cartridge membrane may bear a heavy pollution load, causing pollution blocking on the membrane surface and a significant decrease in filtration effect. Therefore, a water purification device with better filtration effect is needed to solve the above problems. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a water purification device with better filtration effect to solve the above problems.

[0006] Embodiments of the present application provide a low-pressure water purification device based on ultrafiltration membrane technology, comprising:

[0007] a housing having a water purification cavity;

[0008] a filter assembly comprising a cylinder and a filter element arranged on the cylinder, the cylinder comprising a first fixed part, a connecting part and a second fixed part arranged in sequence, one end of the filter element being arranged at the connecting part and the other end extending outward, the opposite ends of the filter element abutting against the first fixed part and the second fixed part, respectively;

[0009] A water inlet pipe is arranged on the side wall of the shell and partially extends into the water purification cavity, and the water inlet pipe is opposite to the filter element;

[0010] The length direction of the water purification device is defined as a first direction, and the filter element is annularly arranged on the peripheral surface of the connecting portion along the first direction.

[0011] In at least one embodiment of the present application, the water purification device further comprises a sealing cover;

[0012] The sealing cover is sleeved on the filter assembly and is provided with a water inlet hole, the water inlet pipe partially extends into the water inlet hole, and the outer peripheral surface of the first fixing portion, the second fixing portion and the filter element abuts against the inner wall of the sealing cover.

[0013] In at least one embodiment of the present application, the cylinder further comprises a stop portion arranged on the connecting portion along the first direction, one end of the stop portion away from the connecting portion abuts against the sealing cover, and the opposite ends of the stop portion are fixedly connected with the first fixing portion and the second fixing portion, respectively;

[0014] The filter element comprises a water inlet end and a water outlet end, the water inlet end and the water outlet end are arranged on the opposite sides of the stop portion, and the water inlet hole is arranged on the water inlet end.

[0015] In at least one embodiment of the present application, the filter assembly further comprises a partition plate fixedly connected with the connecting portion, and the partition plate separates the filter element to form a first filter portion and a second filter portion;

[0016] The partition plate is provided with a through slot, the through slot communicates the first filter portion and the second filter portion, and is located at the water outlet end.

[0017] In at least one embodiment of the present application, the filter element comprises a plurality of filter membranes, the plurality of filter membranes are annularly arranged on the connecting portion, and a filter cavity is formed between adjacent two filter membranes and the sealing cover.

[0018] In at least one embodiment of the present application, the first filter portion is provided with first micropores, the second filter portion is provided with second micropores, the pore diameter of the first micropores is defined as A, the pore diameter of the second micropores is defined as B, and A>B is satisfied.

[0019] In at least one embodiment of the present application, the plurality of filter membranes are equidistantly arranged.

[0020] In at least one embodiment of the present application, the shell comprises a main body and a cover portion, and the main body and the cover portion are mutually covered to form the water purification cavity.

[0021] In at least one embodiment of this application, a sealing groove is formed at the contact end between the cover portion and the body portion in an annular shape;

[0022] The water purification device also includes a sealing element, which is disposed in the sealing groove. The side of the sealing element away from the cover abuts against the side wall of the main body to prevent external impurities from entering the water purification chamber.

[0023] In at least one embodiment of this application, the water purification device further includes a water outlet pipe disposed at the bottom of the housing, and the second filter part has a water outlet at one end opposite to the first filter part. The water outlet is located on the side of the stop part opposite to the through groove and is connected to the water outlet pipe.

[0024] The aforementioned low-pressure water purification device based on ultrafiltration membrane technology features an inlet pipe positioned on the side wall of the housing, directly opposite the filter element. This design allows water to flow in perpendicular to the filter element, preventing localized excessively fast or slow flow as the water passes through the membrane. This ensures uniform water distribution across the entire membrane surface. The annular arrangement increases the filter element's area, providing more filtration surface and enhancing filtration capacity. Water flows more effectively through the entire filtration system, thereby improving the water purification device's throughput and filtration capacity. Attached Figure Description

[0025] Figure 1 This is a perspective view of a low-pressure water purification device based on ultrafiltration membrane technology according to an embodiment of this application.

[0026] Figure 2 for Figure 1 A cross-sectional view of a low-pressure water purification device based on ultrafiltration membrane technology.

[0027] Figure 3 for Figure 1 An exploded perspective view of a low-pressure water purification device based on ultrafiltration membrane technology.

[0028] Figure 4 for Figure 1 An enlarged view of the filter element of a low-pressure water purification device based on ultrafiltration membrane technology.

[0029] Figure 5 for Figure 1 A partially enlarged cross-section of the casing of a low-pressure water purification device based on ultrafiltration membrane technology.

[0030] Figure 6 for Figure 1 A top cross-sectional view of a low-pressure water purification device based on ultrafiltration membrane technology.

[0031] Explanation of main component symbols

[0032] 100. A low-pressure water purifying device based on ultrafiltration membrane technology, comprising: 10, a shell; 11, a water purifying cavity; 12, a main body; 13, a cover part; 131, a sealing groove; 20, a filter assembly; 21, a cylinder; 211, a first fixing part; 212, a connecting part; 213, a second fixing part; 214, a stop part; 22, a filter element; 221, a water inlet end; 222, a water outlet end; 223, a filter membrane; 23, a partition plate; 231, a through groove; 24, a first filtering part; 25, a second filtering part; 251, a water outlet; 30, a water inlet pipe; 40, a sealing cover; 41, a water inlet hole; 50, a sealing element; and 60, a water outlet pipe. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0034] It should be noted that when one component is considered to be "connected" to another component, it can be directly connected to the other component or can exist simultaneously with a middle component. When one component is considered to be "provided on" another component, it can be directly provided on the other component or can exist simultaneously with a middle component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0035] The embodiments of the present application provide a low-pressure water purifying device based on ultrafiltration membrane technology, comprising:

[0036] The shell is provided with a water purifying cavity;

[0037] The filter assembly comprises a cylinder and a filter element provided on the cylinder, the cylinder comprises a first fixing part, a connecting part and a second fixing part arranged in sequence, one end of the filter element is provided on the connecting part, the other end of the filter element extends outward, and the opposite ends of the filter element abut against the first fixing part and the second fixing part, respectively;

[0038] The water inlet pipe is provided on the side wall of the shell and partially extends into the water purifying cavity, and the water inlet pipe is opposite to the filter element;

[0039] The length direction of the water purifying device is defined as a first direction, and the filter element is annularly provided on the peripheral surface of the connecting part along the first direction.

[0040] The low-pressure water purifying device based on the ultrafiltration membrane technology has the water inlet pipe arranged on the side wall of the shell, directly opposite the filter element, so that the water flow can directly enter the filter element, the water flow can avoid the phenomenon of too fast or too slow local water flow when flowing through the filter membrane, thereby ensuring that the water flow is uniformly distributed on the entire membrane surface, the annular arrangement can increase the area of the filter element, thereby providing more filter surface and increasing the filtering capacity. The water flow can pass through the entire filtering system more effectively. Therefore, the flux and filtering capacity of the water purifying device are improved.

[0041] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0042] Please refer to Figures 1-6 The embodiment of the present application provides a low-pressure water purifying device 100 based on an ultrafiltration membrane technology, which comprises a shell 10 and a filter assembly 20; the shell 10 is provided with a water purifying cavity 11;

[0043] The filter assembly 20 comprises a cylinder body 21 and a filter element 22 arranged on the cylinder body 21; the cylinder body 21 comprises a first fixing part 211, a connecting part 212 and a second fixing part 213 arranged in sequence; one end of the filter element 22 is arranged on the connecting part 212, and the other end extends outward; the opposite ends of the filter element 22 abut against the first fixing part 211 and the second fixing part 213, respectively.

[0044] The water inlet pipe 30 is arranged on the side wall of the shell 10 and partially extends into the water purifying cavity 11; the water inlet pipe 30 is directly opposite the filter element 22.

[0045] The length direction of the water purifying device is defined as a first direction; the filter element 22 is annularly arranged on the peripheral surface of the connecting part 212 along the first direction.

[0046] Specifically, the main function of the shell 10 is to accommodate all components of the water purifying device and ensure stable flow of the water flow in the device. The filter assembly 20 is the core part of the water purifying device, which is responsible for filtering impurities and pollutants in the water. The cylinder body 21 is the supporting structure of the filter assembly 20, the first fixing part 211 and the second fixing part 213 are respectively located at the two ends of the filter element 22, and the connecting part 212 is located at the center. Through the sequential arrangement of the three parts, the stable fixation of the filter element 22 is ensured, and the filter element 22 is arranged on the connecting part 212, so that it is not easy to move or fall off during the filtering process.

[0047] Further, the design of the water inlet pipe 30 ensures the guidance of water flow, so that the water flow directly flows to the filter 22, avoiding uneven distribution of water flow. The water inlet pipe 30 is arranged on the side wall of the shell 10, and the filter 22 is arranged along the length direction of the shell 10, so that the liquid flowing into the water inlet port contacts the filter 22 in a direction perpendicular to the filter 22. The annular arrangement of the filter 22 is arranged in the first direction (length direction), which can increase the surface area of the filter 22 and improve the filtering efficiency. Through the annular arrangement, the water flow can pass through more membrane surfaces when passing through the filter 22, and more complete filtration can be achieved.

[0048] Further, the water flow is uniformly distributed on the entire membrane surface, and the annular arrangement can increase the filtering area of the filter 22, thereby providing more filtering surfaces and increasing the filtering capacity. The water flow can pass through the entire filtering system more effectively. Under the same water pressure, the water resistance brought by the filter 22 is smaller, thereby improving the flux of the water purification device.

[0049] In an embodiment, the water purification device further comprises a sealing cover 40.

[0050] The sealing cover 40 is sleeved on the filter assembly 20 and is provided with a water inlet hole 41. The water inlet pipe 30 partially extends into the water inlet hole 41. The first fixing part 211, the second fixing part 213, and the outer circumferential surface of the filter 22 all abut against the inner wall of the sealing cover 40.

[0051] Specifically, the sealing cover 40, as an important component of the water purification device, has multiple functions. Its main function is to ensure the sealing of the filter assembly 20 and prevent water flow from leaking when passing through the filter assembly 20. At the same time, it can also effectively control the water flow path and ensure that the water flow passes through the filter membrane 223.

[0052] The sealing cover 40 is sleeved on the filter assembly 20 and covers the filter 22 and its fixing parts, thereby playing a sealing and protection role. Through the close contact between the inner wall of the sealing cover 40 and the outer circumferential surface of the filter 22, the water flow is prevented from flowing from other areas that should not pass through, thereby ensuring that the water flow completely passes through the filter 22. The water inlet pipe 30 extends into the water inlet hole 41 of the sealing cover 40, which can ensure that the water flow is accurately introduced into the filter 22, avoid deviation of the water flow, and ensure that the water flow uniformly and effectively passes through the filter membrane 223 for filtration.

[0053] In an embodiment, the cylinder 21 further comprises a stop part 214 arranged on the connecting part 212 in the first direction. The end of the stop part 214 away from the connecting part 212 abuts and adheres to the sealing cover 40. The opposite ends of the stop part 214 are fixedly connected with the first fixing part 211 and the second fixing part 213, respectively.

[0054] The filter 22 comprises a water inlet end 221 and a water outlet end 222, which are respectively arranged on opposite sides of the stop portion 214, and the water inlet hole 41 is arranged on the water inlet end 221.

[0055] Specifically, the stop portion 214 divides the filter 22 into two parts, ensuring that the water flow can only flow in a predetermined direction, i.e., annularly flows through the filter 22 from the water inlet end 221 to the water outlet end 222. This design prevents the possibility of backflow of water flow, ensuring the stability and reliability of the filtration process. By effectively limiting the flow direction of the water flow, the stop portion 214 is connected to the first and second fixing portions 213 at both ends, preventing the water flow from entering the water outlet end 222 from the connection of the stop portion 214.

[0056] Further, the water flows from the water inlet pipe 30 into the water purification cavity 11, and then enters the filter assembly 20 through the water inlet hole 41. Under the action of the stop portion 214, the water flow uniformly flows along the outer periphery of the filter 22 and penetrates the filter membrane 223 layer by layer. The water flow enters the outer layer of the filter membrane 223 from the water inlet end 221, and then enters the water outlet end 222 after being filtered by the filter 22. In this process, the stop portion 214 ensures that the water flow can only flow in a set direction and does not backflow, ensuring the smoothness and effectiveness of the water flow through the filter 22.

[0057] In a specific embodiment, the filter assembly 20 further comprises a partition plate 23 fixedly connected to the connecting portion 212, and the partition plate 23 divides the filter 22 into a first filter portion 24 and a second filter portion 25.

[0058] The partition plate 23 is provided with a through groove 231, which connects the first filter portion 24 and the second filter portion 25 and is located at the water outlet end 222.

[0059] Specifically, being divided into two filter portions means that the water flow will undergo two different filtration stages during the filtration process. The first filter portion mainly removes larger impurities such as silt, suspended matter, etc., and the second filter portion further removes finer particles or tiny pollutants (such as bacteria, viruses, chemicals, etc.), thereby achieving step-by-step purification. Optimize the filtration process: by separating the two parts for different degrees of filtration, the burden on the single filter membrane 223 is reduced, making the filtration effect of each part more balanced and stable, and avoiding the situation of premature clogging or excessive load.

[0060] Further, through the design of the partition plate 23, the water flow from the first filter part to the second filter part is orderly guided, which can ensure that the water flow is smoother, avoiding problems such as uneven water flow and uneven distribution. The through groove 231 connects the two filter parts, and the water flow after being treated in the first filter part enters the second filter part through the through groove 231. This design ensures that the water flow can seamlessly enter the second filter part 25 and continue to be filtered. The transition of the water flow from the first part to the second part is smooth, and the filtering effect is effectively continued.

[0061] In a specific embodiment, the filter part 22 comprises a plurality of filter membranes 223, and the plurality of filter membranes 223 are arranged in an annular array on the connecting part 212, and an adjacent two filter membranes 223 and the sealing cover 40 form a filter cavity.

[0062] Specifically, a plurality of filter membranes 223 are arranged in an annular array on the peripheral surface of the connecting part 212. Such a design can make each filter membrane 223 undertake a more uniform filtering task in the entire filtering system, and maximize the utilization area of the filter membrane 223. The annular array design makes the effective contact area of each filter membrane 223 larger, thereby improving the contact efficiency of the water flow and the filter membrane 223, which helps to improve the filtering precision and effect. The plurality of filter membranes 223 are arranged side by side, and the water flow can be uniformly distributed when passing through each filter membrane 223, avoiding that a single filter membrane 223 bears too much pressure, resulting in blockage or damage, thereby prolonging the service life of the filter membrane 223.

[0063] Further, the design of the filter cavity helps to concentrate the water flow, ensures that the water flow has enough time and space to contact the filter membrane 223, and improves the filtering effect. The closed nature of the filter cavity prevents water flow leakage or bypass, ensuring that the water flow passes through the filter membrane 223 according to the predetermined path. The filter cavity formed by surrounding can optimize the water flow path, ensure that the water flow uniformly passes through each filter membrane 223 in the cavity, thereby improving the efficiency and thoroughness of the filtering. The sealing design between the sealing cover 40 and the filter membrane 223 ensures that the water flow cannot leak from around the filter membrane 223, but can only be filtered through the surface of the filter membrane 223, further improving the overall filtering performance of the device.

[0064] In a specific embodiment, the first filter part 24 is provided with first micropores, and the second filter part 25 is provided with second micropores, the pore size of the first micropores is defined as A, and the pore size of the second micropores is defined as B, and A > B is satisfied.

[0065] Specifically, by setting different micro-pore diameters, the water flow first passes through larger pores to filter larger impurities, and then enters the second filtering part 25 to further remove smaller pollutants through smaller pores. Such graded filtration can ensure that the water flow is purified more meticulously at different stages, achieving higher water quality requirements. The design of micro-pores with different diameters can improve the overall filtration efficiency, especially through step-by-step filtration, avoiding the problem of single-pore filter membrane 223 being easily clogged by larger particles, while ensuring that the water flow does not experience excessive resistance at a certain stage. By first removing larger particles with large-diameter micro-pores, the burden on small-diameter micro-pores is reduced, avoiding rapid clogging of the filter membrane 223, thereby effectively prolonging the service life of the entire water purification device

[0066] In a specific embodiment, a plurality of filter membranes 223 are arranged in an equidistant array.

[0067] Specifically, the equidistant array ensures uniform fluid distribution between the filter membranes 223, avoiding local overloading. Especially during the filtration process, the water flow can be dispersed among multiple filter membranes 223, rather than concentrated on a certain part of the filter membranes 223, thereby avoiding local clogging and ensuring sustained filtration effect. By evenly distributing the filter membranes 223, it is ensured that each layer of filter membranes 223 participates in the filtration process, allowing each layer of filter membranes 223 to be utilized to the maximum extent, thereby improving overall filtration efficiency and effectiveness.

[0068] In a specific embodiment, the housing 10 includes a main body 12 and a cover part 13, and the main body 12 and the cover part 13 are covered with each other to form the water purification cavity 11.

[0069] Specifically, the housing 10 is composed of a main body 12 and a cover part 13, which are covered with each other to form a sealed water purification cavity 11. The main body 12 part is usually used to support and accommodate the core components of the water purification device, while the cover part 13 plays a sealing and protection role, ensuring the structural stability of the entire device and the normal filtration of the water flow. The cover part 13 and the main body 12 part are covered, which not only helps to protect the internal filtration assembly 20 and the water flow channel, but also ensures the correct path of the water flow during filtration, avoiding water leakage or loss and improving filtration effect.

[0070] Further, the cover part 13 can usually be detached or opened, facilitating equipment maintenance, cleaning and replacement of the filtration assembly 20. Such a design makes the water purification device more easy to maintain and use, increasing the convenience of the product.

[0071] In a specific embodiment, a sealing groove 131 is annularly arranged at the contact end of the cover part 13 and the main body 12;

[0072] The water purifying device further comprises a sealing member 50 arranged in the sealing groove 131, and the side of the sealing member 50 away from the cover body 13 abuts against the sidewall of the main body 12, so as to prevent external impurities from entering the water purifying cavity 11.

[0073] Specifically, the water purifying cavity 11 can maintain a good sealing state by arranging the sealing groove 131 at the contact end of the cover body 13 and the main body 12 and tightly arranging the sealing member 50. This prevents the pollutants in the external environment from entering the water purifying cavity 11, ensures the cleanliness of the water, and avoids the water flow in the water purifying device from being polluted by the impurities in the external air.

[0074] In an embodiment, the water purifying device further comprises a water outlet pipe 60 arranged at the bottom of the shell 10, and the second filtering part 25 is provided with a water outlet 251 at the end away from the first filtering part 24, the water outlet 251 is located at the side of the stop part 214 away from the through groove 231, and the water outlet 251 is connected to the water outlet pipe 60.

[0075] Specifically, the water outlet pipe 60 is arranged at the bottom of the shell 10 and connected to the filtering device, and mainly responsible for guiding the purified water after multiple filtering out. The pipe is the output end of the filtering device, which ensures that the water purifying device can deliver clean water to the position required by the user.

[0076] Further, the water outlet 251 is located at the end of the second filtering part 25 away from the first filtering part 24, and is related to the layout of the stop part 214. The design of the water outlet 251 ensures that the water flow can finally flow out after passing through the two filtering processes in the device. The core purpose of this design strategy is to ensure that all the water flowing out has passed through the predetermined filtering path, so as to ensure that the water quality meets the standard. The water outlet pipe 60 is arranged at the bottom of the shell 10, which can better receive the water after filtering, and the water outlet pipe 60 can be connected to an external water tank to store or directly output the water after filtering.

[0077] The above only describes the embodiments of the present application, and it should be noted that those skilled in the art can make improvements without departing from the creative concept of the present application, and these improvements are within the protection scope of the present application.

Claims

1. A low pressure water purification device based on ultrafiltration membrane technology, characterized in that, The utility model relates to a water purifying device, including: a shell with a water purifying cavity; a filter assembly including a cylinder and a filter element arranged on the cylinder, the cylinder including a first fixed part, a connecting part and a second fixed part arranged in sequence, one end of the filter element being arranged on the connecting part and the other end extending outward, the opposite ends of the filter element abutting the first fixed part and the second fixed part respectively; a water inlet pipe arranged on the side wall of the shell and partially extending into the water purifying cavity, the water inlet pipe facing the filter element; wherein the length direction of the water purifying device is defined as the first direction, and the filter element is annularly arranged on the peripheral surface of the connecting part along the first direction.

2. The low-pressure water purifier based on ultrafiltration membrane technology according to claim 1, characterized in that, The water purifying device further includes a sealing cover; the sealing cover is sleeved on the filter assembly and is provided with a water inlet hole, the water inlet pipe partially extends into the water inlet hole, and the outer peripheral surfaces of the first fixed part, the second fixed part and the filter element all abut the inner wall of the sealing cover.

3. The low-pressure water purifier based on ultrafiltration membrane technology according to claim 2, characterized in that, The cylinder further includes a stop part arranged on the connecting part along the first direction, one end of the stop part away from the connecting part abutting the sealing cover, and the opposite ends of the stop part are fixedly connected with the first fixed part and the second fixed part respectively; the filter element includes a water inlet end and a water outlet end, the water inlet end and the water outlet end are arranged on the opposite sides of the stop part respectively, and the water inlet hole is arranged on the water inlet end.

4. The low-pressure water purifier based on ultrafiltration membrane technology according to claim 3, characterized in that, The filter assembly further includes a partition plate fixedly connected with the connecting part, and the partition plate separates the filter element to form a first filter part and a second filter part; the partition plate is provided with a through slot, the through slot communicates the first filter part and the second filter part, and is located at the water outlet end.

5. The low pressure water purification device based on ultrafiltration membrane technology according to claim 4, characterized in that, The filter element includes a plurality of filter membranes, and the plurality of filter membranes are annularly arranged on the connecting part, and a filter cavity is formed between adjacent two filter membranes and the sealing cover.

6. The low-pressure water purifier based on ultrafiltration membrane technology according to claim 5, characterized in that, The first filter part is provided with first micropores, the second filter part is provided with second micropores, the pore diameter of the first micropores is defined as A, the pore diameter of the second micropores is defined as B, and A > B is satisfied.

7. The low pressure water purification device based on ultrafiltration membrane technology according to claim 5, characterized in that, The plurality of filter membranes are equidistantly arranged.

8. The low-pressure water purifier based on ultrafiltration membrane technology as claimed in claim 1, wherein, The shell includes a main body and a cover part, the main body and the cover part are mutually covered to form the water purifying cavity.

9. The low pressure water purification device based on ultrafiltration membrane technology according to claim 8, characterized in that, The contact end of the cover part and the main body is annularly provided with a sealing groove; the water purifying device further includes a sealing element arranged in the sealing groove, one side of the sealing element away from the cover part abutting the side wall of the main body, for preventing external impurities from entering the water purifying cavity.

10. The low-pressure water purifier based on ultrafiltration membrane technology as claimed in claim 4, wherein, The water purifying device further includes a water outlet pipe arranged on the bottom of the shell, one end of the second filter part away from the first filter part is provided with a water outlet, the water outlet is located on the side of the stop part away from the through slot and communicates with the water outlet pipe.

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