Ultrafiltration composite filter element and water purification equipment

Abstract

The present invention relates to the technical field of composite filter elements, and specifically to an ultrafiltration composite filter element and water purification equipment. The ultrafiltration composite filter element provided by the present invention divides the internal space of the outer shell into a first filter element chamber and a second filter element chamber by setting an inner shell, the first filter element is set in the first filter element chamber, and the second filter element is set in the second filter element chamber, so as to realize the parallel composite setting of the two filter elements, and effectively reduce the overall volume of the ultrafiltration composite filter element; at the same time, the first filter element and the second filter element are respectively provided with water inlets, and the first filter element and the second filter element are shared or respectively provided with purified water outlets, so as to realize the ultrafiltration composite filter element switching between the three states of water making state, first filter element backwashing second filter element state and second filter element backwashing first filter element state according to the conduction state of the water inlet and the water outlet, and the switching of the ultrafiltration composite filter element between the three states can be realized by only changing the conduction state of the water inlet and the water outlet, with a simple structure, convenient operation and good cleaning effect.

Description

Technical Field

[0001] The present invention relates to the technical field of composite filter elements, and in particular to an ultrafiltration composite filter element and water purification equipment. Background Art

[0002] With the improvement of people's quality of life, the use of water purifiers has become increasingly popular. The application of ultrafiltration membranes in water purification systems can be used as both pre-treatment filter elements and post-treatment filter elements. The ultrafiltration membranes in the filter elements have a long lifespan and can be replaced for three years after cleaning. They have broad application prospects. Therefore, it is necessary to study ultrafiltration membrane cleaning technology. In the existing technology, ultrafiltration membranes can be cleaned by manual disassembly and automatic cleaning. Among them, the manual disassembly and cleaning method is cumbersome and causes many inconveniences to users. Existing automatic ultrafiltration membrane cleaning technology has many drawbacks. Among them, the method of forward and reverse flushing with raw water can cause increasing clogging in areas with poor water quality. The method of backwashing the filter element with clean water from the water storage tank and the method of using parallel independent ultrafiltration with multiple electric ball valves both have the problems of many parts, large size, and high cost, which bring inconvenience to the cleaning of ultrafiltration filter elements. Therefore, it is urgent to develop a highly integrated, compact, and effective ultrafiltration filter element to remove pollutants intercepted on the filter element surface, extend the filter element lifespan, ensure the performance of the water purifier, and improve the user experience. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art ultrafiltration filter element that is large in size and inconvenient to clean, thereby providing an ultrafiltration composite filter element that is small in size and easy to clean.

[0004] Another technical problem to be solved by the present invention is to overcome the defects of the prior art water purification equipment that is large in size and inconvenient to clean, thereby providing a water purification equipment that is small in size and easy to clean.

[0005] In order to solve the above technical problems, the present invention provides an ultrafiltration composite filter element, comprising:

[0006] shell;

[0007] An inner shell is nested in the outer shell, and the inner shell is suitable for dividing the inner space of the outer shell into a first filter element chamber and a second filter element chamber;

[0008] a first filter element, disposed in the first filter element chamber;

[0009] a second filter element, disposed in the second filter element chamber;

[0010] The first filter element and the second filter element are each independently provided with a water inlet suitable for raw water to enter, and the first filter element and the second filter element share or are each provided with a clean water outlet suitable for clean water to discharge; the first filter element and the second filter element are arranged in parallel.

[0011] Optionally, the first filter element is provided with a first ultrafiltration membrane, and is provided with a first water inlet and a first purified water outlet, the first water inlet is communicated with the inner side or the outer side of the first ultrafiltration membrane, and the first purified water outlet is communicated with the outer side or the inner side of the first ultrafiltration membrane;

[0012] The second filter element is provided with a second ultrafiltration membrane and is provided with a second water inlet and a second purified water outlet. The second water inlet is connected to the inner side or outer side of the second ultrafiltration membrane, and the second purified water outlet is connected to the outer side or inner side of the second ultrafiltration membrane.

[0013] Optionally, when the ultrafiltration composite filter element is in the water production state, the first water inlet and the second water inlet are water inlets, the first clean water outlet and the second clean water outlet are water outlets, the first water inlet is connected to the first filter element chamber, and is connected to the first clean water outlet after passing through the first ultrafiltration membrane; the second water inlet is connected to the second filter element chamber, and is connected to the second clean water outlet after passing through the second ultrafiltration membrane.

[0014] Optionally, when the ultrafiltration composite filter element is in a state where the first filter element backflushes the second filter element, the first water inlet and the second clean water outlet are water inlets, the first clean water outlet and the second water inlet are water outlets, the first water inlet is connected to the first filter element chamber, and is connected to the first clean water outlet and the second clean water outlet in sequence after passing through the first ultrafiltration membrane, and is then connected to the second water inlet after passing through the second ultrafiltration membrane.

[0015] Optionally, when the ultrafiltration composite filter element is in the state of the second filter element backflushing the first filter element, the first clean water outlet and the second water inlet are water inlets, the first water inlet and the second clean water outlet are water outlets, the second water inlet is connected to the second filter element chamber, and is connected to the second clean water outlet and the first clean water outlet in sequence after passing through the second ultrafiltration membrane, and then is connected to the first water inlet after passing through the first ultrafiltration membrane.

[0016] Optionally, the ultrafiltration composite filter element further comprises: a filter element seat body, which is suitable for sealingly fitting with the open end of the ultrafiltration composite filter element and is provided with channels equal to the total number of water inlets and purified water outlets.

[0017] Optionally, the first purified water outlet and the second purified water outlet are two independent outlets, which are respectively connected to external pipelines.

[0018] Optionally, the filter element seat body includes: a first annular channel, connected to the first water inlet, the first annular channel is provided with a first annular channel opening, suitable for connecting the first water inlet with an external pipeline;

[0019] a second ring channel, connected to the first purified water outlet, wherein the second ring channel is provided with a second ring channel opening, adapted to connect the first purified water outlet with an external pipeline;

[0020] a third ring channel, connected to the second water inlet, wherein the third ring channel is provided with a third ring channel opening, suitable for connecting the second water inlet with an external pipeline;

[0021] a central circular channel, connected to the second purified water outlet, the central circular channel being provided with a central circular channel opening, suitable for connecting the second purified water outlet with an external pipeline, and the central circular channel opening being connected to the second annular channel opening;

[0022] The main purified water outlet is connected to the central circular opening and the second annular opening, and is suitable for connecting the first purified water outlet and the second purified water outlet to an external pipeline.

[0023] Optionally, the first purified water outlet and the second purified water outlet are connected inside the ultrafiltration composite filter element and merge into a confluence outlet, and the confluence outlet is connected to an external pipeline.

[0024] Optionally, the filter element seat body includes: a first annular channel, connected to the first water inlet, the first annular channel is provided with a first annular channel opening, suitable for connecting the first water inlet with an external pipeline;

[0025] a third ring channel, connected to the second water inlet, wherein the third ring channel is provided with a third ring channel opening, suitable for connecting the second water inlet with an external pipeline;

[0026] A central circular channel is connected to the confluence outlet, and the central circular channel is provided with a central circular channel opening, suitable for connecting the confluence outlet with an external pipeline;

[0027] The main purified water outlet is connected to the central circular channel through the central circular channel opening, and is suitable for connecting the confluence outlet with an external pipeline.

[0028] Optionally, the first filter element and the second filter element are arranged in an upper and lower arrangement or in an inner and outer layer arrangement.

[0029] The present invention provides a water purification device, comprising: the ultrafiltration composite filter element as described above.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The ultrafiltration composite filter element provided by the present invention divides the internal space of the outer shell into a first filter element chamber and a second filter element chamber by arranging the inner shell, wherein the first filter element is arranged in the first filter element chamber and the second filter element is arranged in the second filter element chamber, so that the two filter elements are arranged in parallel and compositely, and the overall volume of the ultrafiltration composite filter element is effectively reduced; at the same time, the first filter element and the second filter element are respectively provided with a water inlet suitable for raw water to enter, and the first filter element and the second filter element are shared or respectively provided with a clean water outlet suitable for clean water to discharge, so that the ultrafiltration composite filter element can switch between the water making state, the first filter element backwashing the second filter element state and the second filter element backwashing the first filter element state according to the conduction state of the water inlet and the clean water outlet, and the switching of the ultrafiltration composite filter element between the three states can be achieved by simply changing the conduction state of the water inlet and the water outlet, with a simple structure, easy operation, good cleaning effect, and conducive to improving user satisfaction.

[0032] 2. The ultrafiltration composite filter element provided by the present invention is provided with a filter element seat body having channels equal to the total number of water inlets and purified water outlets, each loop corresponds to a water inlet or a water outlet, and each of the loops is provided with an opening connected to an external pipeline, so that the water inlet and the water outlet are connected to the external pipeline respectively, which is convenient for controlling the conduction state of the water inlet and the water outlet, thereby facilitating the switching of the ultrafiltration composite filter element between the three states of water production state, the first filter element backwashing the second filter element state, and the second filter element backwashing the first filter element state.

[0033] 3. The ultrafiltration composite filter element provided by the present invention includes a total clean water outlet by setting the filter element seat body, and the total clean water outlet is connected with the water outlet, which is suitable for conducting the clean water discharged from the first clean water outlet and the second clean water outlet to an external pipeline when the ultrafiltration composite filter element is in a water production state; when the ultrafiltration composite filter element is in a state where the first filter element backwashes the second filter element or the second filter element backwashes the first filter element, the total clean water outlet is closed, and the clean water produced by the filter element cannot be discharged to an external pipeline, so that the clean water flows through the flow path connected by the first clean water outlet and the second clean water outlet, realizing one filter element backwashing another filter element.

[0034] 4. The ultrafiltration composite filter element provided by the present invention can achieve a compact structure of the ultrafiltration composite filter element by arranging the first filter element and the second filter element in an upper and lower arrangement or an inner and outer layer arrangement, which is beneficial to reducing the overall volume. The two methods can be freely selected according to actual conditions, which increases selectivity and is conducive to promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic structural diagram of an ultrafiltration composite filter element with filter elements arranged above and below the present invention;

[0037] Figure 2 This is a schematic diagram of the water production state of the ultrafiltration composite filter element with filter elements arranged above and below the present invention;

[0038] Figure 3 Schematic diagram of the first filter element of the ultrafiltration composite filter element with filter elements arranged upper and lower according to the present invention, with the second filter element being backwashed;

[0039] Figure 4 Schematic diagram of the second filter element of the ultrafiltration composite filter element with filter elements arranged above and below the first filter element of the present invention;

[0040] Figure 5 Schematic diagram of the cooperation between the ultrafiltration composite filter element and the filter element seat body with filter elements arranged above and below the present invention;

[0041] Figure 6 This is a schematic structural diagram of an ultrafiltration composite filter element with filter elements arranged in the inner and outer layers of the present invention;

[0042] Figure 7 A top view of the filter element seat of the present invention;

[0043] Figure 8 for Figure 7 Cross-sectional view in the AA direction.

[0044] Description of reference numerals:

[0045] a11, first ultrafiltration membrane; a12, second ultrafiltration membrane; a2, outer shell; a3, inner shell; a41, first water inlet; a42, second water inlet; a51, first purified water outlet; a52, second purified water outlet; a6, filter element seat; a61, first ring channel; a611, first ring channel opening; a62, second ring channel; a621, second ring channel opening; a63, third ring channel; a631, third ring channel opening; a64, central circular channel; a641, central circular channel opening; a65, total purified water outlet. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] Combine Figures 1-8 As shown, the ultrafiltration composite filter element provided in this embodiment includes:

[0052] Shell a2;

[0053] The inner shell a3 is nested in the outer shell a2, and the inner shell a3 is suitable for dividing the inner space of the outer shell a2 into a first filter element chamber and a second filter element chamber;

[0054] a first filter element, disposed in the first filter element chamber;

[0055] a second filter element, disposed in the second filter element chamber;

[0056] The first filter element and the second filter element are each independently provided with a water inlet suitable for raw water to enter, and the first filter element and the second filter element share or are each provided with a clean water outlet suitable for clean water to discharge; the first filter element and the second filter element are arranged in parallel.

[0057] Optionally, the opening ends of the first filter element chamber and the second filter element chamber are respectively connected to external pipelines.

[0058] Optionally, the ultrafiltration composite filter element is suitable for switching between three states: water production state, first filter element backwashing second filter element state, and second filter element backwashing first filter element state according to the conduction state between the water inlet and the purified water outlet.

[0059] It should be noted that one end of the ultrafiltration composite filter element is open and connected to an external pipeline, and the external pipeline refers to a pipeline for supplying water or draining water to the ultrafiltration composite filter element; the water production state refers to the working state in which the first filter element and the second filter element are both in the state of introducing raw water from the water inlet, and the raw water is filtered by the ultrafiltration membrane and discharged from the water outlet as clean water; the state in which the first filter element backwashes the second filter element refers to the working state in which only the first filter element produces clean water, and the clean water produced is used to flush the ultrafiltration membrane of the second filter element; the state in which the second filter element backwashes the first filter element refers to the working state in which only the second filter element produces clean water, and the clean water produced is used to flush the ultrafiltration membrane of the first filter element; the outer side of the ultrafiltration membrane refers to the side of the ultrafiltration membrane close to the outer shell, and the inner side refers to the side of the ultrafiltration membrane opposite to the outer side.

[0060] The ultrafiltration composite filter element provided in this embodiment divides the internal space of the outer shell a2 into a first filter element chamber and a second filter element chamber by arranging the inner shell a3. The first filter element is arranged in the first filter element chamber, and the second filter element is arranged in the second filter element chamber, so as to realize the parallel composite arrangement of the two filter elements, and effectively reduce the overall volume of the ultrafiltration composite filter element; at the same time, the first filter element and the second filter element are respectively provided with a water inlet suitable for the entry of raw water, and the first filter element and the second filter element are shared or respectively provided with a clean water outlet suitable for the discharge of clean water, so that the ultrafiltration composite filter element can switch between the water making state, the first filter element backwashing the second filter element state and the second filter element backwashing the first filter element state according to the conduction state of the water inlet and the water outlet, and the switching of the ultrafiltration composite filter element between the three states can be realized by simply changing the conduction state of the water inlet and the water outlet. It has a simple structure, is easy to operate, and has a good cleaning effect, which is conducive to improving user satisfaction.

[0061] Specifically, the first filter element is provided with a first ultrafiltration membrane a11, and is provided with a first water inlet a41 and a first purified water outlet a51, the first water inlet a41 is communicated with the inner side or the outer side of the first ultrafiltration membrane a11, and the first purified water outlet a51 is communicated with the outer side or the inner side of the first ultrafiltration membrane a11;

[0062] The second filter element is provided with a second ultrafiltration membrane a12, and is provided with a second water inlet a42 and a second purified water outlet a52. The second water inlet a42 is connected to the inner side or outer side of the second ultrafiltration membrane a12, and the second purified water outlet a52 is connected to the outer side or inner side of the second ultrafiltration membrane a12.

[0063] Optionally, the first purified water outlet a51 and the second purified water outlet a52 are independently arranged on the outer shell a2, or the first purified water outlet a51 and the second purified water outlet a52 are merged into one purified water outlet inside the ultrafiltration composite filter element, and the outer shell a2 is provided with a purified water outlet after the merge.

[0064] Optionally, a first protective layer is provided on the outer side of the first ultrafiltration membrane a11, and a plurality of through holes are provided on the first protective layer, and the through holes are suitable for connecting the first ultrafiltration membrane a11 and the first filter element chamber.

[0065] Optionally, a second protective layer is provided on the outer side of the second ultrafiltration membrane a12, a spacer layer is formed between the second protective layer and the inner shell a3, and the first filter element is connected to the first purified water outlet a51 through the spacer layer.

[0066] Optionally, the water production mode of the first ultrafiltration membrane a11 and the second ultrafiltration membrane a12 is external pressure.

[0067] Optionally, a positional arrangement implementation of the first water inlet a41, the first purified water outlet a51, the second water inlet a42, and the second purified water outlet a52 is to arrange them sequentially from the outside to the inside.

[0068] Optionally, the ultrafiltration composite filter element includes at least two filter elements.

[0069] Specifically, when the ultrafiltration composite filter element is in the water production state, the first water inlet a41 and the second water inlet a42 are water inlets, the first purified water outlet a51 and the second purified water outlet a52 are water outlets, the first water inlet a41 is connected to the first filter element chamber, and is connected to the first purified water outlet a51 after passing through the first ultrafiltration membrane a11; the second water inlet a42 is connected to the second filter element chamber, and is connected to the second purified water outlet a52 after passing through the second ultrafiltration membrane a12.

[0070] When the ultrafiltration composite filter element is in the water-making state, raw water enters the first filter element chamber through the first water inlet a41, is filtered through the first ultrafiltration membrane a11 to produce clean water, and the produced clean water flows through the spacer layer between the second ultrafiltration membrane and the inner shell a3 to reach the first clean water outlet a51, and is discharged to the external pipeline through the first clean water outlet a51; at the same time, the raw water in the parallel flow path enters the second filter element chamber through the second water inlet a42, is filtered through the second ultrafiltration membrane a12 to produce clean water, and the produced clean water is discharged to the external pipeline through the second clean water outlet a52.

[0071] Specifically, when the ultrafiltration composite filter element is in the state of the first filter element backflushing the second filter element, the first water inlet a41 and the second clean water outlet a52 are water inlets, the first clean water outlet a51 and the second water inlet a42 are water outlets, the first water inlet a41 is connected to the first filter element chamber, and after passing through the first ultrafiltration membrane a11, it is connected to the first clean water outlet a51 and the second clean water outlet a52 in sequence, and then passes through the second ultrafiltration membrane a12 and is connected to the second water inlet a42.

[0072] When the ultrafiltration composite filter element is in the state of the first filter element backwashing the second filter element, only the first filter element is used to produce clean water. The raw water enters the first filter element chamber from the first water inlet a41, and is produced after passing through the first ultrafiltration membrane a11 to obtain clean water. The produced clean water flows out from the first clean water outlet a51 and then enters the second filter element from the second clean water outlet a52, flows through the second ultrafiltration membrane a12, and is used to clean the second ultrafiltration membrane a12. The waste water after cleaning is discharged from the second water inlet a42.

[0073] Specifically, when the ultrafiltration composite filter element is in the state of the second filter element backflushing the first filter element, the first clean water outlet a51 and the second water inlet a42 are water inlets, the first water inlet a41 and the second clean water outlet a52 are water outlets, the second water inlet a42 is connected to the second filter element chamber, and after passing through the second ultrafiltration membrane a12, it is connected to the second clean water outlet a52 and the first clean water outlet a51 in sequence, and then through the first ultrafiltration membrane a11 and connected to the first water inlet a41.

[0074] When the ultrafiltration composite filter element is in the state of the second filter element backwashing the first filter element, only the second filter element is used to produce clean water. The raw water enters the second filter element chamber from the second water inlet a42, and is produced after passing through the second ultrafiltration membrane a12 to obtain clean water. The produced clean water flows out from the second clean water outlet a52 and then enters the first filter element chamber from the first clean water outlet a51, flows through the first ultrafiltration membrane a11, and is used to clean the first ultrafiltration membrane a11. The waste water after cleaning is discharged from the first water inlet a41.

[0075] Specifically, the ultrafiltration composite filter element further includes: a filter element seat a6, which is suitable for sealing and fitting with the open end of the ultrafiltration composite filter element and is provided with channels equal to the total number of water inlets and purified water outlets.

[0076] Specifically, the first purified water outlet a51 and the second purified water outlet a52 are two independent outlets, which are respectively connected to external pipelines.

[0077] Specifically, the filter element seat body a6 includes: a first annular channel a61, which is connected to the first water inlet a41; the first annular channel a61 is provided with a first annular channel opening a611, which is suitable for connecting the first water inlet a41 with an external pipeline;

[0078] The second ring channel a62 is connected to the first purified water outlet a51. The second ring channel a62 is provided with a second ring channel opening a621, which is suitable for connecting the first purified water outlet a51 with an external pipeline;

[0079] The third ring channel a63 is connected to the second water inlet a42. The third ring channel a63 is provided with a third ring channel opening a631, which is suitable for connecting the second water inlet a42 with an external pipeline;

[0080] The central circular channel a64 is connected to the second purified water outlet a52. The central circular channel a64 is provided with a central circular channel opening a641, which is suitable for connecting the second purified water outlet a52 with an external pipeline, and the central circular channel opening a641 is connected to the second annular channel opening a621;

[0081] The total purified water outlet a65 is connected to the central circular opening a641 and the second annular opening a621, and is suitable for connecting the first purified water outlet a51 and the second purified water outlet a52 to an external pipeline.

[0082] It should be noted that when the first purified water outlet a51 and the second purified water outlet a52 are two independent outlets, the total number of the water inlet and purified water outlet is 4. At this time, the filter element seat body a6 is provided with 4 channels, namely the first ring channel a61, the second ring channel a62, the third ring channel a63, and the central circle channel a64.

[0083] It should be noted that the central circle opening a641 is connected to the second ring channel opening a621, so that the first clean water outlet a51 and the second clean water outlet a52 are connected. When the ultrafiltration composite filter element is in the state of the first filter element backwashing the second filter element or the second filter element backwashing the first filter element, the total clean water outlet a65 is closed. At this time, the clean water produced by the filter element cannot be discharged into the external pipeline. Therefore, the clean water produced by one filter element can flow into another filter element through the passage between the first clean water outlet a51 and the second clean water outlet a52 for flushing the ultrafiltration membrane.

[0084] Optionally, the ultrafiltration composite filter element includes at least two filter elements. When the number of the filter elements is 3, the filter element seat body a6 includes 5 annular channels and one central circular channel, for a total of 6 channels.

[0085] Specifically, the first purified water outlet a51 and the second purified water outlet a52 are connected inside the ultrafiltration composite filter element and merge into a confluence outlet, and the confluence outlet is connected to an external pipeline.

[0086] Specifically, the filter element seat body a6 includes: a first annular channel a61, which is connected to the first water inlet a41; the first annular channel a61 is provided with a first annular channel opening a611, which is suitable for connecting the first water inlet a41 with an external pipeline;

[0087] The third ring channel a63 is connected to the second water inlet a42. The third ring channel a63 is provided with a third ring channel opening a631, which is suitable for connecting the second water inlet a42 with an external pipeline;

[0088] The central circular channel a64 is connected to the confluence outlet. The central circular channel a64 is provided with a central circular channel opening a641 suitable for connecting the confluence outlet with an external pipeline;

[0089] The total purified water outlet a65 is connected to the central circular channel a64 through the central circular channel opening a641, and is suitable for connecting the confluence outlet with an external pipeline.

[0090] It should be noted that when the first purified water outlet a51 and the second purified water outlet a52 are connected and converged to a confluence outlet inside the ultrafiltration composite filter element, the total number of water inlets and purified water outlets is 3. At this time, the filter element seat body a6 is provided with 3 channels, namely the first ring channel a61, the third ring channel a63, and the central circle channel a64.

[0091] Optionally, when the number of the filter elements is 3, the filter element seat body a6 includes 3 annular channels and one central circular channel, a total of 4 channels.

[0092] Optionally, the annular channel and the central circular channel of the filter element seat body a6 are sealed with the water inlet and the water outlet through a sealing ring.

[0093] It should be noted that, when the ultrafiltration composite filter element is in the state of the first filter element backwashing the second filter element or the state of the second filter element backwashing the first filter element, the total clean water outlet a65 is closed. At this time, the clean water produced by the filter element cannot be discharged into the external pipeline, and the first clean water outlet a51 and the second clean water outlet a52 are connected inside the ultrafiltration composite filter element and converge into a confluence outlet, that is, the first clean water outlet a51 and the second clean water outlet a52 are in a conductive state, so the clean water produced by one filter element can flow into another filter element through the passage between the first clean water outlet a51 and the second clean water outlet a52 for flushing the ultrafiltration membrane.

[0094] The ultrafiltration composite filter element provided in this embodiment is provided with a filter element seat body a6 having channels equal to the total number of water inlets and purified water outlets, each loop corresponds to a water inlet or a water outlet, and each of the loops is provided with an opening connected to an external pipeline, so that the water inlet and the water outlet are connected to the external pipeline respectively, which facilitates the control of the conduction state of the water inlet and the water outlet, thereby facilitating the switching of the ultrafiltration composite filter element between the three states of water production state, the first filter element backwashing the second filter element state, and the second filter element backwashing the first filter element state.

[0095] The ultrafiltration composite filter element provided in this embodiment includes a total clean water port a65 by setting the filter element seat body a6, and the total clean water port a65 is connected to the water outlet, which is suitable for conducting the clean water discharged from the first clean water outlet a51 and the second clean water outlet a52 to an external pipeline when the ultrafiltration composite filter element is in a water production state; when the ultrafiltration composite filter element is in a state where the first filter element backwashes the second filter element or the second filter element backwashes the first filter element, the total clean water port a65 is closed, and the clean water produced by the filter element cannot be discharged to an external pipeline, so that the clean water flows through the flow path connected by the first clean water outlet a51 and the second clean water outlet a52, thereby realizing one filter element backwashing another filter element.

[0096] Specifically, the first filter element and the second filter element are arranged in an up-down arrangement or an inner-outer layer arrangement.

[0097] The ultrafiltration composite filter element provided in this embodiment can achieve a compact structure of the ultrafiltration composite filter element by arranging the first filter element and the second filter element in an upper and lower arrangement or an inner and outer layer arrangement, which is beneficial to reducing the overall volume. The two methods can be freely selected according to actual conditions, which increases selectivity and is conducive to promotion and use.

[0098] Example 2

[0099] This embodiment provides a water purification device, including: the ultrafiltration composite filter element described above.

[0100] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An ultrafiltration composite filter element, characterized in that: include: Shell (a2); An inner shell (a3) ​​is nested in the outer shell (a2), and the inner shell (a3) ​​is suitable for dividing the inner space of the outer shell (a2) into a first filter element chamber and a second filter element chamber; a first filter element, disposed in the first filter element chamber; a second filter element, disposed in the second filter element chamber; The first filter element and the second filter element are each independently provided with a water inlet suitable for raw water to enter, and the first filter element and the second filter element are shared or separately provided with a purified water outlet suitable for purified water to discharge; the first filter element and the second filter element are arranged in parallel; The ultrafiltration composite filter element is switched among three states: water production state, first filter element backwashing second filter element state, and second filter element backwashing first filter element state according to the conduction state between the water inlet and the purified water outlet; The first filter element is provided with a first ultrafiltration membrane (a11), and is provided with a first water inlet (a41) and a first purified water outlet (a51), the first water inlet (a41) is communicated with the inner side or the outer side of the first ultrafiltration membrane (a11), and the first purified water outlet (a51) is communicated with the outer side or the inner side of the first ultrafiltration membrane (a11); The second filter element is provided with a second ultrafiltration membrane (a12), and is provided with a second water inlet (a42) and a second purified water outlet (a52), the second water inlet (a42) is communicated with the inner side or the outer side of the second ultrafiltration membrane (a12), and the second purified water outlet (a52) is communicated with the outer side or the inner side of the second ultrafiltration membrane (a12); When the ultrafiltration composite filter element is in a water production state, the first water inlet (a41) and the second water inlet (a42) are water inlets, the first purified water outlet (a51) and the second purified water outlet (a52) are water outlets, the first water inlet (a41) is communicated with the first filter element chamber, and is communicated with the first purified water outlet (a51) after passing through the first ultrafiltration membrane (a11); the second water inlet (a42) is communicated with the second filter element chamber, and is communicated with the second purified water outlet (a52) after passing through the second ultrafiltration membrane (a12); When the ultrafiltration composite filter element is in a state where the first filter element backwashes the second filter element, the first water inlet (a41) and the second purified water outlet (a52) are water inlets, the first purified water outlet (a51) and the second water inlet (a42) are water outlets, the first water inlet (a41) is connected to the first filter element chamber, and is connected to the first purified water outlet (a51) and the second purified water outlet (a52) in sequence after passing through the first ultrafiltration membrane (a11), and is then connected to the second water inlet (a42) after passing through the second ultrafiltration membrane (a12); When the ultrafiltration composite filter element is in a state where the second filter element backwashes the first filter element, the first clean water outlet (a51) and the second water inlet (a42) are water inlets, the first water inlet (a41) and the second clean water outlet (a52) are water outlets, the second water inlet (a42) is communicated with the second filter element chamber, and is communicated with the second clean water outlet (a52) and the first clean water outlet (a51) in sequence after passing through the second ultrafiltration membrane (a12), and is then communicated with the first water inlet (a41) after passing through the first ultrafiltration membrane (a11); The ultrafiltration composite filter element further comprises: a filter element seat body (a6), which is suitable for sealingly fitting with the open end of the ultrafiltration composite filter element and is provided with channels equal to the total number of water inlets and purified water outlets.

2. The ultrafiltration composite filter element according to claim 1, characterized in that: The first purified water outlet (a51) and the second purified water outlet (a52) are two independent outlets, each of which is connected to an external pipeline.

3. The ultrafiltration composite filter element according to claim 2, characterized in that: The filter element seat (a6) includes: a first annular channel (a61) connected to the first water inlet (a41); the first annular channel (a61) is provided with a first annular channel opening (a611) suitable for connecting the first water inlet (a41) with an external pipeline; a second annular channel (a62) connected to the first purified water outlet (a51); the second annular channel (a62) is provided with a second annular channel opening (a621) suitable for connecting the first purified water outlet (a51) with an external pipeline; a third annular channel (a63) connected to the second water inlet (a42); the third annular channel (a63) is provided with a third annular channel opening (a631) suitable for connecting the second water inlet (a42) with an external pipeline; a central circular channel (a64) connected to the second purified water outlet (a52); the central circular channel (a64) is provided with a central circular channel opening (a641) suitable for connecting the second purified water outlet (a52) with an external pipeline, and the central circular channel opening (a641) is connected to the second annular channel opening (a621); The total purified water outlet (a65) is connected to the central circular opening (a641) and the second annular opening (a621), and is suitable for connecting the first purified water outlet (a51) and the second purified water outlet (a52) to an external pipeline.

4. The ultrafiltration composite filter element according to claim 1, characterized in that: The first purified water outlet (a51) and the second purified water outlet (a52) are connected inside the ultrafiltration composite filter element and converge into a confluence outlet, and the confluence outlet is connected to an external pipeline.

5. The ultrafiltration composite filter element according to claim 4, characterized in that: The filter element seat (a6) includes: a first annular channel (a61) connected to the first water inlet (a41); the first annular channel (a61) is provided with a first annular channel opening (a611) suitable for connecting the first water inlet (a41) with an external pipeline; a third annular channel (a63) connected to the second water inlet (a42); the third annular channel (a63) is provided with a third annular channel opening (a631) suitable for connecting the second water inlet (a42) with an external pipeline; A central circular channel (a64) is connected to the confluence outlet, and the central circular channel (a64) is provided with a central circular channel opening (a641) suitable for connecting the confluence outlet with an external pipeline; The total purified water outlet (a65) is connected to the central circular channel (a64) through the central circular channel opening (a641), and is suitable for connecting the confluence outlet with an external pipeline.

6. The ultrafiltration composite filter element according to any one of claims 1 to 5, characterized in that: The first filter element and the second filter element are arranged in an up-down arrangement or an inner-outer layer arrangement.

7. A water purification device, characterized in that: include: The ultrafiltration composite filter element according to any one of claims 1 to 6.

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