Filtering device

Abstract

The application discloses a filtering device, comprising a center tube, a plurality of filter membranes arranged along the circumference of the center tube and rolled on the center tube, each filter membrane is surrounded by a membrane sheet to form a purified water flow channel, two adjacent filter membranes are surrounded by a liquid supply channel, and the flow directions of concentrated water in the liquid supply channel and direct drinking water in the purified water flow channel are opposite; wherein: when the water production rate requirement needs to be met, the desalination rate of the membrane sheet corresponding to the liquid supply channel is increased from the starting end to the end of the liquid supply channel; when the ion concentration requirement of direct drinking water needs to be met, the desalination rate of the membrane sheet corresponding to the liquid supply channel is decreased from the starting end to the end of the liquid supply channel.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and more particularly to a filtration device. Background Technology

[0002] Filter devices (or filter membranes) are the core components of household water purification systems. Filter devices are used to filter raw water (such as tap water) into drinking water and concentrated water, and drinking water can be consumed directly.

[0003] A filtration device typically includes a central tube and a filter membrane wound around the central tube. The filter membrane consists of two membrane sheets forming a water purification channel, with a liquid supply channel formed between two adjacent filter membranes.

[0004] To mitigate the polarization phenomenon, Chinese patents with patent numbers 2021105829232 and 2021105828850 both disclose a filtration device. This filtration device extends the supply channel (concentrated water channel) and the purified water channel (drinking water channel) radially, and the fluids in the two channels flow in opposite directions, thereby creating convection between the fluids in the two channels. This effectively mitigates the polarization phenomenon, improves filtration efficiency to a certain extent, and ensures operational stability.

[0005] However, both the existing filtration devices and the filtration devices provided by the aforementioned patents have the following problems:

[0006] When a filtration device with a high production rate is selected to meet the requirement of a high water production rate, the drinking water filtered by the device has a high ion concentration, poor taste, and may even pose a drinking water safety hazard.

[0007] When a filtration device with a high ion interception capacity is selected to meet the requirement of producing high-purity drinking water, the ion generation rate of the filtration device is extremely low, and sometimes it cannot meet the needs of immediate drinking. Summary of the Invention

[0008] In view of the above-mentioned technical problems existing in the prior art, embodiments of the present invention provide a filtering device.

[0009] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of the present invention is as follows:

[0010] A filtration device, comprising:

[0011] Central tube;

[0012] The filter membrane comprises multiple membranes arranged circumferentially along a central tube and wound onto the central tube. Each membrane forms a purified water channel, and adjacent membranes form a liquid supply channel, with the concentrated water in the liquid supply channel flowing in the opposite direction to the drinking water in the purified water channel; wherein:

[0013] When it is necessary to meet the water production rate requirement, the desalination rate of the membrane corresponding to the liquid supply channel is increased from the beginning end to the end end of the liquid supply channel.

[0014] When it is necessary to meet the ion concentration requirements of direct drinking water, the desalination rate of the membrane corresponding to the liquid supply channel is reduced from the beginning to the end of the liquid supply channel.

[0015] Preferably, the membrane has multiple filtration zones with different desalination rates, and the desalination rate of the same filtration zone is the same; wherein:

[0016] When the water production rate requirement needs to be met, the multiple filtration zones are arranged in a manner that increases the desalination rate from the beginning to the end of the liquid supply channel.

[0017] When it is necessary to meet the ion concentration requirements of direct drinking water, multiple filtration zones are arranged from the beginning to the end of the liquid supply channel in a manner that reduces the desalination rate.

[0018] Preferably, the membrane consists of a base layer and multiple desalination layers with different desalination rates disposed on the base layer, wherein each of the multiple desalination layers corresponds to a multiple of the filtration zones.

[0019] Preferably, the membrane sheet includes multiple membrane units, each membrane unit including a base layer and a desalination layer disposed on the base layer; the multiple membrane units correspond one-to-one with the multiple filtration areas; wherein: adjacent membrane units are connected by side bonding.

[0020] Preferably, the cross-section of the purified water channel is increased in the direction of water flow for direct drinking.

[0021] Preferably, the concentrated water in the liquid supply channel flows radially inward, and the drinking water in the purified water channel flows radially outward.

[0022] Preferably, the concentrated water in the liquid supply channel flows radially outward, and the drinking water in the purified water channel flows radially inward.

[0023] Preferably, a support grid is provided in both the liquid supply channel and the purified water channel.

[0024] Compared with the prior art, the beneficial effects of the filtration device disclosed in this invention are:

[0025] By increasing the desalination rate of the filter membrane along the flow direction of the concentrated water in the supply channel, the ion concentration of drinking water can be kept from being too high while meeting the requirements for water production rate; by decreasing the desalination rate of the filter membrane along the flow direction of the concentrated water in the supply channel, the water production efficiency of drinking water can be kept from being too low while meeting the requirements for producing drinking water with low ion concentration.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the invention.

[0027] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0028] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0029] Figure 1 A schematic diagram of the filter membrane structure in the filtration device provided in the embodiment of the present invention (the concentrated water in the liquid supply channel flows radially inward).

[0030] Figure 2 This is a schematic diagram of the filter membrane structure in the filtration device provided in an embodiment of the present invention (the concentrated water in the liquid supply channel flows radially outward).

[0031] Figure 3 A schematic diagram of the structure of the filtration device provided in the embodiment of the present invention (the concentrated water in the liquid supply channel flows radially inward).

[0032] Figure 4 A schematic diagram of the filtration device provided in an embodiment of the present invention (the concentrated water in the liquid supply channel flows radially outward).

[0033] Figure 5 This is a schematic diagram of the structure of the membrane in a filtration device provided according to an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the structure of the membrane in a filtration device provided in another embodiment of the present invention.

[0035] Figure label:

[0036] 10-Filter membrane; 11-Membrane sheet; 111-Membrane unit; 112-Desalination layer; 113-Base layer; 21-Clean water channel; 22-Liquid supply channel; 221-Starting end; 222-Ending end; 23-Support grid; 30-Central tube. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0040] like Figures 1 to 6 As shown, an embodiment of the present invention discloses a filtration device, which includes a central tube 30, a filter membrane 10, and a housing (not shown in the figures).

[0041] like Figure 3 and Figure 4 As shown, the filter membrane 10 includes multiple membranes, which are arranged circumferentially along the central tube 30 and rolled up on the central tube 30 (the attached figure only shows a view of the filter membrane 10 in an unfolded state; in fact, in the filtration device, the filter membrane 10 should be in the rolled-up state shown in the filtration devices provided by Chinese patents with patent numbers 2021105829232 and 2021105828850). Each filter membrane 10 is surrounded by a membrane sheet 11 to form a purified water flow channel 21, and two adjacent filter membranes 10 are surrounded by a liquid supply flow channel 22, such that the concentrated water in the liquid supply flow channel 22 flows in the opposite direction to the drinking water in the purified water flow channel 21; a housing is disposed around the filter membrane 10.

[0042] It should be noted that:

[0043] The filtration device provided by the present invention is identical to the filtration device provided by Chinese patents with patent numbers 2021105829232 and 2021105828850 in terms of the winding of the filter membrane 10 and the flow direction of the purified water channel 21 and the liquid supply channel 22.

[0044] For example, such as Figure 1 and Figure 3 As shown, the flow directions of the liquid supply channel 22 and the purified water channel 21 in the filtration device disclosed in this invention are the same as those of the liquid supply channel and the purified water channel in the filtration device provided by Chinese Patent No. 2021105829232. That is, the concentrated water in the liquid supply channel 22 flows in the opposite direction to the drinking water in the purified water channel 21, and the concentrated water in the liquid supply channel 22 flows radially inward, while the drinking water in the purified water channel 21 flows radially outward.

[0045] For example, such as Figure 2 and Figure 4 As shown, the flow directions of the liquid supply channel 22 and the purified water channel 21 in the filtration device disclosed in this invention are the same as those of the liquid supply channel and the purified water channel in the filtration device provided by Chinese Patent No. 2021105828850. That is, the concentrated water in the liquid supply channel 22 flows in the opposite direction to the drinking water in the purified water channel 21, and the concentrated water in the liquid supply channel 22 flows radially outward, while the drinking water in the purified water channel 21 flows radially inward.

[0046] However, the filtration device provided by the present invention differs from the filtration devices provided in the aforementioned patents and the prior art in that:

[0047] In the direction of concentrated water flow in the supply channel 22, that is, in the direction from the starting end 221 to the ending end 222, the desalination rate of the filter membrane 10 increases or decreases, and these two trends in the desalination rate of the filter membrane 10 need to be based on the requirements of the filtration device's output rate and the ion concentration of the drinking water.

[0048] It should be noted that, under the same conditions such as concentrated water pressure and ionized concentrated water, the higher the desalination rate, the stronger the ion interception ability of the membrane 11 in the filter membrane 10, and the lower the ion concentration of the obtained drinking water; the lower the desalination rate, the weaker the ion interception ability of the membrane 11 in the filter membrane 10, and the higher the ion concentration of the obtained drinking water.

[0049] Based on the requirements for water production rate and low ion concentration in drinking water, two models of filtration devices can be provided using the technical solutions of Chinese patents with patent numbers 2021105829232 and 2021105828850.

[0050] The first type: The filter membrane is made by using a membrane with a low desalination rate and is rolled up. The desalination rate is the same in any area of ​​the membrane. This makes the desalination rate of the membrane the same in the direction of the concentrated water flow in the liquid supply channel. This type of filter device can meet the requirements of high throughput and high water production rate because of the low desalination rate of the filter membrane inside.

[0051] The second type uses a membrane with a high desalination rate to make a filter membrane and roll it up. The desalination rate is the same in any area of ​​the membrane. This makes the desalination rate the same in the direction of concentrated water flow in the liquid supply channel. This type of filter device can meet the requirements of obtaining low ion concentration drinking water because of its high desalination rate.

[0052] However, the applicant discovered through testing and practical application that the two types of filter devices mentioned above in the prior art have the following defects:

[0053] Although the first type of filtration device can meet the requirement of high water production rate, the ion concentration of the produced drinking water is very high, resulting in poor taste and potential safety hazards.

[0054] Although the second type of filtration device can meet the requirements for drinking water with low ion concentration, the water production rate is very low and the water production efficiency is very low.

[0055] In the filtration device provided by the present invention, the desalination rate of the filter membrane 10 varies in the direction of the flow of concentrated water in the liquid supply channel 22, and the variation in the desalination rate can solve the above-mentioned problems in the prior art.

[0056] Based on the requirements for generation rate and low ion concentration, the present invention also provides two models of filtration devices.

[0057] The first type: In this type, the desalination rate of the membrane 11 increases from the starting end 221 to the ending end 222 of the liquid supply channel 22, and the desalination rate of the membrane 11 corresponding to the starting end 221 of the liquid supply channel 22 is approximately equal to the desalination rate of the membrane 11 in the first type of filter device in the prior art. Obviously, the desalination rate of the membrane 11 corresponding to the ending end 222 of the liquid supply channel 22 is higher than the desalination rate of the membrane 11 in the first type of filter device in the prior art.

[0058] The second type: In this type, the desalination rate of the membrane 11 decreases from the starting end 221 to the ending end 222 of the liquid supply channel 22, and the desalination rate of the membrane 11 corresponding to the starting end 221 of the liquid supply channel 22 is approximately equal to the desalination rate of the membrane 11 of the second type of filter device in the prior art. However, it is obvious that the desalination rate of the membrane 11 corresponding to the ending end 222 of the liquid supply channel 22 is lower than the desalination rate of the second type of filter device in the prior art in this region.

[0059] Furthermore, it is obvious that the desalination rate of any region of the filter membrane 10 of the first type of filter device is much lower than that of any region of the filter membrane 10 of the second type of filter device.

[0060] The applicant has discovered the following advantages when applying the two types of filtration devices provided by the technical solution of this invention to meet the requirements for water production rate and low ion concentration:

[0061] The first model is applied to water purification systems that meet the requirements of high flow rate and high water production rate. Its advantage is that the water production rate of this model of filter device is not significantly reduced compared to the water production rate of the first model of filter device in the prior art. However, the ion concentration of the produced drinking water is reduced to a greater extent, thus enabling the drinking water to meet drinking requirements.

[0062] The reason why the first type of filtration device provided by the present invention has the above-mentioned advantages is as follows:

[0063] Although the desalination rate of membrane 11 increases in the direction of concentrated water flow within the supply channel 22, the average desalination rate of membrane 11 remains relatively low across the entire flow path. This prevents a significant reduction in the water production rate of the filtration device. However, since the ion concentration of the concentrated water inevitably increases along its flow direction, setting membrane 11 with an increased desalination rate significantly reduces the concentration of the produced drinking water. Furthermore, by setting membrane 11 with an increased desalination rate, the difference in ion concentration between the starting and ending points of the purified water channel 21 is reduced, resulting in more uniform ion concentration in the purified drinking water. This leads to smaller fluctuations in the ion concentration of the purified drinking water, potentially eliminating the need for subsequent mixing processes and equipment.

[0064] The second model is applied to water purification systems that meet the requirements of low ion concentration. Its advantage is that the ion concentration of the drinking water produced by this model of filter device is not significantly higher than that of the drinking water produced by the second model of filter device in the prior art. However, the water production rate of this model of filter device is significantly improved, so that the water production rate of the filter device can basically meet the requirements of water production efficiency.

[0065] The reason why the second type of filtration device provided by the present invention has the above-mentioned advantages is as follows:

[0066] Although the desalination rate of membrane 11 decreases in the direction of concentrated water flow within the supply channel 22, the average desalination rate of membrane 11 remains at a high level throughout the entire flow channel. This results in no significant increase in the ion concentration of the drinking water produced by the filtration device. However, since the ion concentration of concentrated water tends to increase along the flow direction of concentrated water, by setting membrane 11 with a lower desalination rate along the flow direction, it is beneficial to improve the water production rate near the end of the supply channel 22. This improvement is significant under the premise of a reasonable arrangement of the desalination rate.

[0067] It should be noted that:

[0068] The first type of filtration device provided by the present invention requires continuous practical testing to adjust the specific parameters of the desalination rate in order to meet the requirements of high water production rate and drinking standards, so as to avoid unreasonable adjustment that would seriously affect the water production rate.

[0069] The second type of filtration device provided by the present invention, in order to meet the requirements of low ion concentration drinking water and take into account the water production rate, also needs to adjust the specific parameters of the desalination rate through continuous actual tests, so as to avoid unreasonable adjustment that would seriously increase the ion concentration of the drinking water.

[0070] The advantages of the filtration device provided by this invention are as follows:

[0071] By increasing the desalination rate of the filter membrane 10 along the flow direction of the concentrated water in the supply channel 22, the ion concentration of drinking water can be kept too high while meeting the requirements for water production rate; by decreasing the desalination rate of the filter membrane 10 along the flow direction of the concentrated water in the supply channel 22, the water production efficiency of drinking water can be kept too low while meeting the requirements for producing drinking water with low ion concentration.

[0072] In a preferred embodiment, the cross-sections of the water purification channel 21 of the first type of filtration device and the water purification channel 21 of the second type of filtration device provided by the present invention are both increased along the flow direction of drinking water, which is conducive to the discharge of drinking water and thus improves the water production rate.

[0073] In a preferred embodiment, the diaphragm 11 is constructed as follows:

[0074] like Figure 5 As shown, the membrane 11 is composed of a base layer 113 and multiple desalination layers 112 laid on the base layer 113 (the desalination rate of the membrane 11 is determined by the desalination layer 112). The desalination rates of different desalination layers 112 are different, and the desalination rates of the same desalination layer 112 are the same, so that the different desalination layers 112 are arranged in order of desalination rate.

[0075] like Figure 6As shown, in another preferred embodiment, the diaphragm 11 is constructed as follows:

[0076] The membrane 11 includes multiple membrane units 111, each of which includes a base layer 113 and a desalination layer 112 laid on the base layer 113; different membrane units 111 have different desalination rates; wherein, two adjacent membrane units 111 are connected by side-mounted bonding.

[0077] Wherein: the base layer 113 is formed of polyester nonwoven fabric and polysulfone ultrafiltration layer; the desalination layer 112 is formed of polyamide layer.

[0078] In some preferred embodiments, a support grid 23 is provided in both the liquid supply channel 22 and the clean water channel 21 to ensure sufficient clearance within them.

[0079] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0080] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art when reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiments. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being able to be combined with each other in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0081] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A filtration device, characterized in that, include: Central tube; The filter membrane comprises multiple membranes arranged circumferentially along a central tube and wound onto the central tube. Each membrane forms a purified water channel, and adjacent membranes form a liquid supply channel, with the concentrated water in the liquid supply channel flowing in the opposite direction to the drinking water in the purified water channel; wherein: When it is necessary to meet the water production rate requirement, the desalination rate of the membrane corresponding to the liquid supply channel is increased from the beginning end to the end end of the liquid supply channel. When it is necessary to meet the ion concentration requirements of direct drinking water, the desalination rate of the membrane corresponding to the liquid supply channel is reduced from the beginning to the end of the liquid supply channel.

2. The filtration device according to claim 1, characterized in that, The membrane has multiple filtration zones with different desalination rates, and the desalination rate is the same in the same filtration zone; wherein: When the water production rate requirement needs to be met, the multiple filtration zones are arranged in a manner that increases the desalination rate from the beginning to the end of the liquid supply channel. When it is necessary to meet the ion concentration requirements of direct drinking water, multiple filtration zones are arranged from the beginning to the end of the liquid supply channel in a manner that reduces the desalination rate.

3. The filtration device according to claim 2, characterized in that, The membrane consists of a base layer and multiple desalination layers with different desalination rates disposed on the base layer, with each of the multiple desalination layers corresponding to a multiple of the multiple filtration zones.

4. The filtration device according to claim 2, characterized in that, The membrane sheet includes multiple membrane units, each of which includes a base layer and a desalination layer disposed on the base layer; the multiple membrane units correspond one-to-one with the multiple filtration areas; wherein, adjacent membrane units are connected by side bonding.

5. The filtration device according to claim 1, characterized in that, The cross-section of the purified water channel increases in the direction of water flow for direct drinking.

6. The filtration device according to claim 1, characterized in that, The concentrated water in the liquid supply channel flows radially inward, and the drinking water in the purified water channel flows radially outward.

7. The filtration device according to claim 1, characterized in that, The concentrated water in the liquid supply channel flows radially outward, while the drinking water in the purified water channel flows radially inward.

8. The filtration device according to claim 1, characterized in that, Support grids are provided in both the liquid supply channel and the purified water channel.

Images