Patent Publication Number: US-2022220018-A1

Title: Filter module for water dispensing device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2021-0004519, filed in Korea on Jan. 13, 2021, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     1. Field 
     The present specification relates to a filter module for a water dispensing device having an electrostatic adsorption function. 
     2. Background 
     In general, water dispensing devices such as water purifiers and refrigerators refer to devices for purifying raw water such as tap water or groundwater. In other words, the water dispensing device refers to a device for converting raw water into drinking water through various purification methods and providing the drinking water. In order to generate purified water, processes such as precipitation, filtration, and sterilization may be performed, and harmful substances are generally removed through these processes, or the like. 
     In general, various filters may be provided in a water dispensing device to purify raw water. These filters may be classified into a sediment filter, an activated carbon filter, an ultrafiltration (UF) hollow fiber membrane filter, a reverse osmosis (RO) membrane filter, and the like, according to their functions. The sediment filter may refer to as a filter for precipitating contaminants or suspended matter having large particles in raw water, and the activated carbon filter may refer to as a filter for adsorbing and removing contaminants with small particles, residual chlorine, volatile organic compounds, or odor generation factors. 
     In addition, two activated carbon filters may generally be provided. In other words, two activated carbon filters may include a pre-activated carbon filter provided on the raw water side and a post-activated carbon filter provided on the purified water side. The post activated carbon filter may be provided to improve the taste of water by removing odor-causing substances that mainly affect the taste of purified water. In addition, the UF hollow fiber membrane filter and the RO membrane filter are generally used selectively. 
     Recently, the demand for a water purifier or a refrigerator having a water purifying function has increased significantly. Therefore, there is a problem that various requirements are generated and it is difficult to satisfy the various requirements at the same time. 
     As an example, it is possible to remove heavy metals by applying the RO membrane filter, but there is a problem in that it is difficult to secure the purified water flow rate. In other words, there is a problem in that it takes a lot of time to obtain a desired amount of purified water. On the other hand, in the case of the UF hollow fiber membrane filter, it is possible to secure a high flow rate, but since it is difficult to remove heavy metals in water, there is a problem in that it is difficult to use groundwater or tap water from a contaminated area as raw water. 
     Therefore, removal of heavy metals and securing high flow rates were inevitably recognized as contradictory problems. This is because, when using an RO membrane filter to remove heavy metals, it is difficult to secure high flow rate, and when using a UF hollow fiber membrane filter to secure high flow rate, it becomes difficult to remove heavy metals. 
     In addition, in the conventional case, when a carbon block is used as a single filter, it is difficult to remove viruses and bacteria, and when several filters are individually provided, there was a problem in that the volume of the filter increases. In addition, since the UF filter (ultrafiltration filter) or the electrostatic adsorption filter is a chemical product, when the UF filter or the electrostatic adsorption filter is applied last, an issue occurs in that the taste of water changes. 
     In addition, virus removal performance may be affected by the quality of the raw water. In the case of overseas areas, the quality of raw water is often worse than that of domestic water. Therefore, if the filter does not properly remove the virus in the water, there is also a problem that the filter performance is reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements, and wherein: 
         FIG. 1  is a water pipe diagram illustrating a water dispensing device to which a filter module according to the present disclosure is applied; 
         FIG. 2  is a perspective view illustrating a filter module for a water dispensing device according to an embodiment of the present disclosure; 
         FIG. 3  is a cross-sectional view illustrating a filter module for a water dispensing device according to an embodiment of the present disclosure; 
         FIG. 4  is a view in which the flow direction of water is indicated by arrows in  FIG. 3 ; 
         FIG. 5  is a perspective view illustrating a state where an electrostatic adsorption nonwoven fabric and a second carbon block, which are some components of the present disclosure, are coupled; and 
         FIG. 6  is a table illustrating the components to be removed by each material constituting the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings. However, the idea of the present disclosure is not limited to the embodiments presented below, and those skilled in the art who understand the idea of the present disclosure will be able to easily implement other embodiments included within the scope of the same idea by adding, changing, deleting, and adding components, but this will also be said to be included within the scope of the present disclosure. 
     The drawings accompanying the following embodiments are embodiments of the same inventive idea, but within the scope that the inventive idea is not damaged, in order to be easily understood, the expression of minute parts may be expressed differently for each drawing, and, according to the drawing, a specific part may not be displayed or may be exaggerated according to the drawing. 
       FIG. 1  is a water pipe diagram illustrating a water dispensing device to which a filter module according to the present disclosure is applied. The water dispensing device according to the present disclosure is for directly taking out purified water after purifying water supplied from an external water supply source, cooling the water or heating the water to take the water out, and may refer to, for example, a direct water type purifier. Here, the direct water type purifier refers to a type of water purifier in which water passes through a filter in real time and purified water is ejected when a user requests for ejection of purified water without a storage tank in which purified water is stored. 
     In addition, the water dispensing device according to the present disclosure may refer to a refrigerator having a water purification function. In other words, while being a refrigerator, the water dispensing device may refer to a water purifier refrigerator including a filter for purifying raw water and a water ejection nozzle through which purified water is ejected. In addition, the water dispensing device according to the present disclosure may refer to an under sink type water purifier in which the main body is installed under the sink and the water ejection nozzle is installed outside the sink. In addition, the water dispensing device according to the present disclosure may refer to various types of known devices that receive water from a water supply source, pass the water through a filter to perform water purification treatment, and then supply the purified water to the outside. 
     Referring to  FIG. 1 , in the water dispensing device according to an embodiment of the present disclosure, a water supply line L is formed from a water supply source to a water ejection port, and various valves and parts can be connected to the water supply line L. More specifically, the water supply line L is connected to the water supply source, for example, a domestic faucet, or the like, and a filter module  17  is disposed at a certain point of the water supply line L and thus foreign substances contained in drinking water which is supplied from the water supply source are filtered. 
     In addition, the water supply valve  61  and the flow rate sensor  70  may be sequentially disposed in the water supply line L connected to the discharge port end of the filter module  17 . Accordingly, when the supply amount sensed by the flow rate sensor  70  reaches a set flow rate, the water supply valve  61  may be controlled to be closed. In addition, at any point of the water supply line L extending from the discharge port end of the flow sensor  70 , a water supply line for hot water supply L 1 , a water supply line for cold water supply L 3 , and a water supply line for cooling water supply L 2  may be branched. 
     In addition, a purified water ejection valve  66  may be mounted at the end portion of the water supply line L extending from the discharge port end of the flow sensor  70 , and a hot water ejection valve  64  may be mounted at the end portion of the water supply line for hot water supply L 1 . In addition, a cold water ejection valve  65  may be mounted at an end portion of the water supply line for cold water supply L 3 , and a cooling water valve  63  may be mounted at any point of the water supply line for cooling water supply L 2 . The cooling water valve  63  may adjust the amount of cooling water supplied to the cooling water generation part  20 . 
     In addition, the water supply line extending from the discharge port ends of the hot water ejection valve  64 , the cold water ejection valve  65 , and the purified water ejection valve  66  are all connected to the water ejection port. In addition, as illustrated, the purified water, cold water, and hot water may be configured to be connected to a single take-out port or may be configured to be respectively connected to independent take-out ports in some cases. 
     Hereinafter, a supply process of water purification will be described with reference to  FIG. 1 . In the case of purified water, when the purified water ejection valve  66  is opened by pressing the purified water selection button on the manipulation display part, purified water that has passed through the filter module  17  may be taken out through the water ejection port. 
     Hereinafter, a cold water and hot water supply process will be described with reference to  FIG. 1 . First, in the case of cold water, when the cooling water valve  63  is opened and cooling water is supplied to the cold water generation part  20 , while the water in the water supply line for cold water supply L 3  passing through the cold water generation part  20  is cooled by the cooling water, cold water is produced. In this case, the water supply line for cooling water supply L 2  may include a refrigerant cycle for cooling the cooling water. The refrigerant cycle may include a compressor, a condenser, an expansion valve, an evaporator, and the like. Thereafter, when the cold water ejection valve  65  is opened by pressing the cold water selection button of the manipulation display part, cold water may be taken out through the water ejection port. 
     Meanwhile, in the case of hot water, hot water is generated while the water flowing along the water supply line for hot water supply L 1  is heated by the hot water heater  30 , and when the hot water ejection valve  64  is opened by pressing the hot water selection button of the manipulation display part, hot water may be taken out through the water ejection port. 
     The filter module  17  of the water dispensing device according to an embodiment of the present disclosure having the above configuration includes at least one filter to generate purified water from raw water. Hereinafter, a filter module for a water dispensing device according to an embodiment of the present disclosure will be described. 
       FIG. 2  is a perspective view illustrating a filter module for a water dispensing device according to an embodiment of the present disclosure,  FIG. 3  is a cross-sectional view illustrating a filter module for a water dispensing device according to an embodiment of the present disclosure, and  FIG. 4  is a view in which the flow direction of water is indicated by arrows in  FIG. 3 . Referring to  FIGS. 2 to 4 , the filter module for a water dispensing device according to an embodiment of the present disclosure includes a plurality of filters. 
     The filter module  17  for the water dispensing device may be detachably coupled to a filter socket (not illustrated) installed on the water supply flow path L. For example, the filter socket may form three filter connection parts so that a total of three filters  100 ,  200 , and  300  are mounted. 
     The filter module  17  may have one side (the left side of  FIG. 3 ) connected to the raw water flow path Lr in which raw water flows, and the other side (the right side of  FIG. 3 ) connected with the purified water flow path Lp through which the purified water is discharged. The raw water flow path Lr may be connected to a water supply source, and the water supply line for hot water supply L 1  and the water supply line for cold water supply L 3  may branch from the purified water flow path Lp. 
     Referring to  FIGS. 2 to 4 , the filter module  17  for the water dispensing device may include a pre-filter  100 . In addition, the filter module  17  for the water dispensing device may include a hollow fiber membrane filter  200 . In addition, the filter module  17  for the water dispensing device includes a composite filter  300 . 
     In addition, the filter module  17  for the water dispensing device may include a plurality of filters selected from the pre-filter  100 , the hollow fiber membrane filter  200 , and the composite filter  300 . For example, the filter module  17  for the water dispensing device may include all of the pre-filter  100 , the hollow fiber membrane filter  200 , and the composite filter  300 . In addition, the pre-filter  100 , the hollow fiber membrane filter  200 , and the composite filter  300  may be sequentially disposed along the flow direction of water. 
     Each of the filters  100 ,  200 , and  300  may include a filter housing  110 ,  210 ,  310  having an inflow port and a discharge port, and a filtration member provided in the filter housing  110 ,  210 ,  310  to purify the water flowing therein through the inflow port. Discharge ports  112 ,  212 ,  312  through which water is discharged are formed in the upper center of the filter housings  110 ,  210 , and  310 , and inflow ports  111 ,  211 ,  311  in which water flows are formed on the outside of the discharge ports  112 ,  212 , and  312 . 
     The water flowing into the filter housings  110 ,  210 , and  310  through the inflow ports  111 ,  211 , and  311  is purified while passing through the filtration member, and then, through the discharge ports  112 ,  212 ,  312 , can be discharged out of the filter housings  110 ,  210 ,  310 . In addition, the water flowing into the inflow ports  111 ,  211 ,  311  flows from the upper side to the lower side along the inflow path defined by the inner surface of the filter housing  110 ,  210 ,  310  and then passes through the filtration member, and the water passing through the filtration member flows from the lower side to the upper side along the discharge flow path located on the central side of the inflow path, and then exits to the outside of the filter housings  110 ,  210 ,  310  through the discharge ports  112 ,  212 , and  312 . 
     The pre-filter  100  has an inflow port  111  and a discharge port  112  formed therein and may include a first filter housing  110  having a space  113  therein and a filtration member accommodated in the first filter housing  110 . The filtration member of the pre-filter  100  may be provided as a first carbon block  120  having a hollow shape. Accordingly, the raw water flowing into the filter module  17  may be filtered firstly while passing through the first carbon block  120 . 
     Referring to  FIG. 4 , the raw water flowing into the pre-filter  100  through the inflow port  111  flows therein from the upper side to the lower side through a space between the first filter housing  110  and the outer surface of the first carbon block  120  and then is filtered while passing through the first carbon block  120 . In addition, the water passing through the first carbon block  120  flows from the lower side to the upper side through the hollow  121  of the first carbon block  120  and, through the discharge port  112  communicating with the hollow  121 , is discharged to the outside of the pre-filter  100 . 
     Then, the water flowing out of the pre-filter  100  flows to the hollow fiber membrane filter  200 . The filtration member of the hollow fiber membrane filter  200  may be provided with a plurality of hollow fiber membranes  220  (UF Membrane). Accordingly, the water flowing into the hollow fiber membrane filter  200  may be filtered secondly while passing through the hollow fiber membrane  220 . 
     Referring to  FIG. 4 , a hollow inner cover  240  is disposed in the space  213  inside the second filter housing  210 , and a hollow fiber membrane  220  is disposed inside the inner cover  240 . Then, the water flowing into the hollow fiber membrane filter  200  through the inflow port  211  flows from the upper side to the lower side along the flow path defined by a space between the second filter housing  210  and the hollow inner cover  240 . 
     Thereafter, the water flows into the inner side of the inner cover  240  through a space between the lower end of the inner cover  240  and the second filter housing ( 210 ). A hollow fiber membrane  220  is disposed on the inner side of the inner cover  240 , and the water flowing into the inner cover  240  is filtered secondly while passing through the hollow fiber membrane  220  and then is discharged to the outside of the second filter housing  210  through the discharge port  212 . 
     In addition, in the inner cover  240 , an intermediate hole  241  communicating the outer space and the inner space of the inner cover  240  is formed, and the water flowing into the second filter housing  210  may flow from the upper side to the lower side along the inner surface of the second filter housing  210  and the outer surface of the inner cover  240  and may flow into the inner space of the inner cover  240  through the intermediate hole  241 . 
     Then, the water flowing into the inner cover  240  is secondly filtered while passing through the hollow fiber membrane  220 , and then discharged to the outside of the second filter housing  210  through the discharge port  212 . Then, the water that exits through the hollow fiber membrane filter  200  flows to the composite filter  300 . 
     Composite filter  300  may include an electrostatic adsorption member through which water passing through the hollow fiber membrane filter  200  thirdly passes, and a second carbon block  322  through which water passing through the electrostatic adsorption member passes fourthly. The electrostatic adsorption member may mean, for example, the electrostatic adsorption nonwoven fabric (or electrostatic adsorption filter)  321 . In the following description, the electrostatic adsorption member will be described as the electrostatic adsorption nonwoven fabric  321 , but the scope of the present disclosure is not limited thereto, and the electrostatic adsorption member may be made of various materials having an electrostatic adsorption function in addition to the electrostatic adsorption nonwoven fabric  321 . 
     Meanwhile, in the above case, the filtration member of the composite filter  300  may include an electrostatic adsorption nonwoven fabric  321  and a second carbon block  322 . Therefore, the water flowing into the composite filter  300  is thirdly filtered while passing through the electrostatic adsorption non-woven fabric  321 , is fourthly filtered while passing through the second carbon block  322 , and finally may be discharged to the outside of the composite filter  300 . 
     Referring to  FIG. 4 , an electrostatic adsorption nonwoven fabric  321  and a second carbon block  322  are disposed in the inner space of the third filter housing  310 . Then, the water flowing into the composite filter  300  through the inflow port  311  flows from the upper side to the lower side along the inner surface of the third filter housing  310 , is filtered while passing through the electrostatic adsorption nonwoven fabric  321  and the second carbon block  322 , and flows from the lower side to the upper side through the hollow  323  of the second carbon block  322 . Thereafter, the water exits the third filter housing  310  through the discharge port  312  communicating with the hollow  323  of the second carbon block  322 . 
       FIG. 5  is a perspective view illustrating a state where an electrostatic adsorption nonwoven fabric and a second carbon block, which are some components of the present disclosure, are coupled. Referring to  FIGS. 3 to 5 , the electrostatic adsorption nonwoven fabric  321  may form a hollow part. 
     The electrostatic adsorption nonwoven fabric  321  may have a hollow pipe shape as a whole. In addition, the electrostatic adsorption nonwoven fabric  321  may include powdered activated carbon particles. 
     In addition, the electrostatic adsorption nonwoven fabric  321  may form a closed curve by crimping a rectangular nonwoven fabric and thermally fuse in a state where both end portions of the nonwoven fabric are in contact. The electrostatic adsorption nonwoven fabric  321  includes a plurality of convex parts (or convex surfaces)  321   a  formed to be convex outward and concave part (concave surfaces)  321   b  provided between the convex parts  321   a , so that wrinkles can be formed along the circumferential direction. In the present disclosure, a case where wrinkles are formed in the electrostatic adsorption nonwoven fabric  321  will be described as an example, but the scope of the present disclosure is not limited thereto, and the electrostatic adsorption nonwoven fabric  321  may be smoothly formed without wrinkles. 
     In addition, the electrostatic adsorption nonwoven fabric  321  may be formed in a rolling type like a rolled toilet paper. In addition, the electrostatic adsorption nonwoven fabric  321  may be formed as a single layer. In addition, the electrostatic adsorption nonwoven fabric  321  may be formed in multiple layers. 
     Meanwhile, as described above, when the electrostatic adsorption nonwoven fabric  321  is formed to be wrinkled, the surface area of the electrostatic adsorption nonwoven fabric  321  increases, and heavy metals in water can be more reliably removed. In addition, when the electrostatic adsorption nonwoven fabric  321  is formed in multiple layers, heavy metals in water can be more reliably removed. 
     The electrostatic adsorption nonwoven fabric  321  may be disposed to surround the outer surface of the second carbon block  322 . In this embodiment, the electrostatic adsorption nonwoven fabric  321  and the second carbon block  322  may be accommodated in one filter housing  310  to constitute the composite filter  300 . Then, while flowing from the lower side to the upper side, the water flowing into the filter housing  310  passes through the electrostatic adsorption nonwoven fabric  321  and the second carbon block  322  in order. 
     As described above, when the water flowing into the filter housing  310  passes through the electrostatic adsorption nonwoven fabric  321 , the virus in the water may be removed. In addition, when the water flowing into the filter housing  310  passes through the electrostatic adsorption nonwoven fabric  321 , heavy metals such as chromium (Cr) and selenium (Se) in the water may be removed. 
     For example, in the present disclosure, the electrostatic adsorption nonwoven fabric  321  may be implemented by applying a polyamine-based polymer positively charged functional group to a cellulose support body. For reference, the virus is negatively charged in tap water state (neutral pH), and when passing through a filter including the electrostatic adsorption nonwoven fabric  321 , the virus is removed while being electrostatically adsorbed by a positively charged functional group. Accordingly, when the water flowing into the filter housing  310  passes through the electrostatic adsorption nonwoven fabric  321 , the virus and fine particles in the water may be adsorbed and removed through positive charge adsorption. 
     The electrostatic adsorption nonwoven fabric  321  may also be referred to as a ‘positive charge adsorption nonwoven fabric’ from a functional point of view. Here, the electrostatic adsorption nonwoven fabric  321  is a material different from the ‘anion nonwoven fabric’. 
       FIG. 6  is a table illustrating the components to be removed by each material constituting the present disclosure. Referring to  FIG. 6 , when water passes through a plurality of carbon blocks, it can be confirmed that residual chlorine, chloroform, particulate matter, and heavy metals in the water are removed, and taste, odor, and the like are reduced. 
     In addition, when water passes through the hollow fiber membrane, it can be confirmed that particulate matter and bacteria in the water are removed. In addition, when water passes through the electrostatic adsorption nonwoven fabric, it can be confirmed that particulate matter, bacteria, and viruses are removed. 
     Therefore, as in the present disclosure, when the water flowing into the filter module  17  passes through the plurality of carbon blocks  120  and  322 , the hollow fiber membrane  220 , and the electrostatic adsorption nonwoven fabric  321 , residual chlorine, chloroform, particulate matter, heavy metals, bacteria, and viruses in water can be removed. 
     In addition, since the water flowing into the composite filter  300  finally passes through the second carbon block  322 , the smell of water is removed and the taste of water is improved. Meanwhile, as described above, when the electrostatic adsorption nonwoven fabric  321  and the second carbon block  322  are disposed in one filter housing  310 , the filtration efficiency can increase and the purified water flow rate can be maintained. 
     In addition, there is no need to expand the filter installation space formed in the water purifier, refrigerator, or the like and it can be applied immediately by simply replacing the existing filter. In addition, space utilization can increase by reducing the volume of the filter, and furthermore, slimming of a water purifier, a refrigerator, and the like can be realized. 
     At least one of the carbon blocks  120  and  322  may be formed by processing a mixture containing activated carbon and a binder. The activated carbon may be included in the form of granular or powder. As described above, when the carbon blocks  120  and  322  include activated carbon, the carbon blocks  120  and  322  can effectively remove heavy metals in water and also residual chlorine components in water. Accordingly, the taste of water may also be improved. In addition, chloroform (CHCL 3 ) in water can be also effectively removed by the activated carbon. 
     In addition, the carbon blocks  120  and  322  include a binder. The binder connects the activated carbon and the selectively mixed functional material to each other and is mixed to impart rigidity. 
     With the configuration of the binder, the activated carbon and the functional material may be processed in the form of a block having rigidity. For example, the functional material may include titanium oxide (for example, Na 4 TiO 4 ) and Ferric Hydroxide. In other words, the carbon blocks  120  and  322  may be prepared by mixing activated carbon and a binder and may be prepared by further including titanium oxide (for example, Na 4 TiO 4 ) and Ferric Hydroxide. 
     For reference, the carbon blocks  120  and  322  may be formed by uniformly mixing a plurality of materials, including activated carbon and a binder, and then putting it in a mold and heating it. A binder (for example, polyethylene, PE) is melted by heating in the mold, and materials such as activated carbon are coupled. Accordingly, the carbon blocks  120  and  322  in the form of blocks having overall rigidity can be formed. 
     Hereinafter, additional configurations of each filter will be described. The pre-filter  100  may further include a filter bracket  130  accommodated inside the filter housing  110  and coupled to the upper side and/or lower side of the first carbon block  120 . 
     The filter housings  110 ,  210 , and  310  may form upper surfaces  115 ,  215 , and  315  of which at least a portion is flat. In addition, discharge ports  112 ,  212 , and  312  may be formed at the center of the upper surfaces  115 ,  215 , and  315 . In addition, inflow ports  111 ,  211 , and  311  may be formed outside the discharge ports  112 ,  212  and  312  of the upper surfaces  115 ,  215 , and  315 . 
     In addition, on the upper surfaces  115 ,  215 ,  315  of the filter housings  110 ,  210 ,  310 , hollow discharge pipes  117 ,  217 ,  317  extending upward from the discharge ports  112 ,  212 ,  312 , and hollow inflow pipes  116 ,  216 ,  316  extending upward from the inflow ports  111 ,  211 ,  311  can be formed. The inflow pipes  116 ,  216 ,  316  and the discharge pipes  117 ,  217  and  317  may be formed to protrude upward from the upper surfaces  115 ,  215  and  315  of the filter housings  110 ,  210  and  310 . 
     Referring to  FIGS. 3 to 4 , the inflow pipe  116  and the discharge pipe  117  are formed on the upper surface  115  of the filter housing  110  of the pre-filter  100 . In addition, the inflow pipe  116  is connected to the raw water flow path Lr connected to the water supply source. Accordingly, the raw water flowing into the raw water flow path Lr flows into the filter housing  110  through the inflow pipe  116  and the inflow port  111 , and passes through the first carbon block  120 . While passing through the first carbon block  120 , the water which firstly purified is discharged to the outside of the filter housing  110  through the discharge port  112  and the discharge pipe  117 . 
     For example, the end portion of the inflow pipe  116  may be inserted into and connected to the end portion of the raw water flow path Lr and may be connected through a separate connecting member. In addition, the discharge pipe  117  of the pre-filter  100  is connected to the inflow pipe  216  of the hollow fiber membrane filter  200 . 
     The discharge pipe  117  of the pre-filter  100  and the inflow pipe  216  of the hollow fiber membrane filter  200  may be connected through a separate connection pipe Lc. The end portion of the discharge pipe  117  of the pre-filter  100  and the inflow pipe  216  of the hollow fiber membrane filter  200  may be connected by being inserted into the end portion of the connecting pipe Lc and may be connected through a separate connecting member. 
     The connecting pipe Lc may be provided as a hose having elasticity. Accordingly, the water flowing into the connection pipe Lc, which is firstly purified, flows into the filter housing  210  through the inflow pipe  216  and the inflow port  211  and passes through the hollow fiber membrane  220 . The water which is secondly purified while passing through the hollow fiber membrane  220  is discharged to the outside of the filter housing  210  through the discharge port  212  and the discharge pipe  217 . 
     In addition, the discharge pipe  217  of the hollow fiber membrane filter  200  is connected to the inflow pipe  316  of the composite filter  300 . The discharge pipe  217  of the hollow fiber membrane filter  200  and the inflow pipe  316  of the composite filter  300  may also be connected through a separate connection pipe Lc. The end portions of the discharge pipe  217  of the hollow fiber membrane filter  200  and the inflow pipe  316  of the composite filter  300  may be connected by being inserted into the end of the connecting pipe Lc and may be connected through a separate connecting member. 
     Accordingly, the water flowing into the connecting pipe Lc, which is secondly purified flows into the filter housing  310  through the inflow pipe  316  and the inflow port  311  and passes through the electrostatic adsorption nonwoven fabric  321  and the second carbon block  322 . The water which is thirdly purified while passing through the electrostatic adsorption nonwoven fabric  321  and is fourthly purified while passing through the second carbon block  322  is discharged to the outside of the filter housing  310  through the discharge port  312  and the discharge pipe  317 . 
     In addition, the water discharged to the outside of the filter housing  310  may be connected to the purified water flow path Lp. For example, the end portion of the discharge pipe  317  may be inserted into and connected to the end portion of the purified water flow path Lp and may be connected through a separate connecting member. 
     Again, referring to  FIGS. 3 to 4 , filter brackets  130 ,  230 , and  330  are coupled to the upper end of the filtration member, and hollow parts  131 ,  231 ,  331  communicating with the discharge ports  112 ,  212 , and  312  may be formed in the filter brackets  130 ,  230 ,  330 . The hollow part  131  of the filter bracket  130  may also communicate with the hollow  121  of the first carbon block  120 . Accordingly, water in the hollow  121  of the first carbon block  120  may flow to the discharge port  112  and the discharge pipe  117  through the hollow part  131  of the filter bracket  130 . 
     In addition, the hollow part  231  of the filter bracket  230  may communicate with the chamber  260  formed at the outlet end of the hollow fiber membrane  220 . The filter bracket  230  may be connected to the upper side of the inner cover  240 , and the chamber  260  may be defined by the lower end of the filter bracket  230  and the upper end of the inner cover  240 . Accordingly, water flowing into the chamber  260  after passing through the hollow fiber membrane  220  may flow to the discharge port  212  and the discharge pipe  217  through the hollow part  231  of the filter bracket  230 . 
     Also, the hollow part  331  of the filter bracket  330  may communicate with the hollow  323  of the second carbon block  322 . Accordingly, water in the hollow  323  of the second carbon block  322  may flow to the discharge port  312  and the discharge pipe  317  through the hollow part  331  of the filter bracket  330 . 
     In addition, the filter brackets  130 ,  230 , and  330  may include cover parts (or covers)  132 ,  232 ,  332  for covering the upper surface of the filtration member, and extension parts (or extensions)  133 ,  233 ,  333  extending upward from the center of the upper end of the cover part  132 ,  232 ,  332 . In addition, the filter housings  110 ,  210 , and  310  are formed with hollow insertion parts (or insertion openings)  118 ,  218 , and  318  extending downward from the inner upper end, and the extension parts  133 ,  233 ,  333  may be inserted into the insertion parts  118 ,  218 , and  318 . Further, sealing members  150 ,  250 , and  350  may be inserted between the extension parts  133 ,  233 ,  333  and the insertion parts  118 ,  218 ,  318 . 
     Hereinafter, the manufacturing process of the carbon blocks  120  and  322 , which are some components of the present disclosure, will be briefly described. First, each material constituting the carbon blocks  120  and  322  is mixed in a proportion to create a carbon block mixture. 
     Then, the evenly mixed carbon block mixture is filled in the mold. Then, the evenly mixed carbon block mixture goes through a compression process and is put into an electric furnace. Then, a heating process is performed. In the heating process, the binder, for example, polyethylene (PE) is melted, the activated carbon and the binder are integrally coupled, and the carbon blocks  120  and  322  in the form of a hollow tube having overall rigidity may be molded. 
     In addition, after heating, cooling proceeds, and when cooling is completed, the mold is separated. In addition, the hollow tube-shaped carbon block separated from the mold may be cut to a unit length. In addition, the cut carbon blocks  120  and  322  may be cleaned by spraying compressed air. After that, the dimensions and the weight are checked, and if there are no abnormalities, packaging is performed. 
     According to the present disclosure as described above, there is an aspect that the water flowing into the filter housing passes through the electrostatic adsorption filter and then flows out to the outside of the filter housing, so that viruses, bacteria, particulate matter, or the like can be reliably removed, and the filtration power can be improved. 
     According to the present disclosure, there is an aspect that a flow path can be secured so that water flowing into the filter housing passes through the electrostatic adsorption filter and the carbon block in turn, and then exits to the outside of the filter housing. According to the present disclosure, there is also an aspect that the specific surface area of the electrostatic adsorption nonwoven fabric increases, and thus the filter life can be prolonged. 
     According to the present disclosure, there is an aspect of more reliably removing particulate matter, bacteria, and viruses contained in water. According to the present disclosure, there is an aspect of preventing the taste of water finally supplied to the user from being changed. 
     According to the present disclosure, there is an aspect that the water purification process is performed several times by a plurality of filters, and thus the removal of various foreign substances including heavy metals can be performed more reliably. According to the present disclosure, since only the material of the filter is changed and the shape or disposition structure of a filter applied to a water purifier, a refrigerator, or the like is not changed, there is an aspect that the present disclosure can be directly applied to an existing refrigerator, a water purifier, or the like. 
     According to the present disclosure, there is an aspect that space utilization can be increased by deposing heterogeneous filters in one filter housing in the transverse direction to reduce the volume of the filter, and furthermore, the slimming of refrigerators and water purifiers can be realized. 
     The present disclosure provides a filter module for a water dispensing device which can more reliably remove viruses, bacteria, particulate matter, or the like by allowing the water flowing into the filter housing to pass through the electrostatic adsorption filter and then to exit to the outside of the filter housing. The present disclosure provides a filter module for a water dispensing device that secures a flow path so that water flowing into a filter housing passes through an electrostatic adsorption filter and a carbon block in turn, and then exits to the outside of the filter housing. 
     The present disclosure provides a filter module for a water dispensing device capable of more reliably removing particulate matter, bacteria, and viruses contained in water. The present disclosure proposes a filter module for a water dispensing device that prevents the taste of water finally supplied to a user from being changed. 
     The present disclosure provides a filter module for a water dispensing device that can be directly applied to an existing water purifier, refrigerator, or the like without changing the shape or disposition structure of the filter applied to the water purifier, refrigerator, or the like. The present disclosure provides a filter module for a water dispensing device that can increase space utilization by disposing heterogeneous filters in one filter housing in the transverse direction to reduce the volume of the filter. 
     A filter module for a water dispensing device according to the present disclosure includes a filter housing which has an inflow port and a discharge port, and a filtration member provided in the filter housing to purify water flowing therein through the inflow port and to supply purified water to the discharge port. In addition, the filter module may include a pre-filter through which raw water passes firstly and in which a first carbon block having a hollow shape is built-in, and a hollow fiber membrane (UF membrane) filter through which water passes through the pre-filter passes secondly. 
     In addition, the filter module may include an electrostatic adsorption nonwoven fabric through which water passing through the hollow fiber membrane filter passes thirdly, and a second carbon block through which water passing through the electrostatic adsorption nonwoven fabric passes fourthly. In addition, the electrostatic adsorption nonwoven fabric may have a hollow shape and may be disposed to surround an outer surface of the second carbon block. 
     In addition, the second carbon block and the electrostatic adsorption nonwoven fabric may be disposed inside a third filter housing to constitute a composite filter. In addition, the electrostatic adsorption nonwoven fabric may include a plurality of convex parts convex outwardly and a concave part provided between the convex parts and may be wrinkled along a circumferential direction thereof. 
     The electrostatic adsorption nonwoven fabric may be formed in multiple layers. The carbon block may be formed by processing a mixture containing activated carbon and a binder. 
     In addition, the water flowing into the filter housing may pass through the filtration member after flowing from the upper side to the lower side along the inner surface of the filter housing and exit to the outside of the filter housing while flowing from the lower side to the upper side. In addition, a hollow inner cover for accommodating the filtration member may be disposed in the filter housing. 
     In addition, the water flowing into the filter housing may flow from the upper side to the lower side along the inner surface of the filter housing and the outer surface of the inner cover and thus flow into the inner cover through a space between the lower end of the inner cover and the filter housing to pass through the filtration member. In addition, an intermediate hole communicating the outer space and the inner space of the inner cover may be formed in the inner cover, and the water flowing into the filter housing may flow from the upper side to the lower side along the inner surface of the filter housing and the outer surface of the inner cover and then flow into the inner space of the inner cover through the intermediate hole. 
     In addition, the filter housing may form an upper surface at least a part of which is made of a flat surface, the discharge port may be formed on the central side of the upper surface, and the inflow port may be formed outside the discharge port of the upper surface. In addition, a hollow discharge pipe extending upward from the discharge port, and a hollow inflow pipe extending upward from the inflow port may be formed on the upper surface of the filter housing. 
     In addition, a filter bracket may be coupled to the upper end of the filtration member, and the filter bracket may have a hollow part communicating with the discharge port. In addition, the filter bracket may include a cover part covering the upper surface of the filtration member, and an extension part extending upwardly from the center of the upper end of the cover part. In addition, the filter housing may be formed with a hollow insert part extending downward from the upper end of the inner side, the extension part may be inserted into the insertion part, and a sealing member may be inserted between the extension part and the insertion part. 
     It will be understood that when an element or layer is referred to as being “on” another element or layer, the element or layer can be directly on another element or layer or intervening elements or layers. In contrast, when an element is referred to as being “directly on” another element or layer, there are no intervening elements or layers present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. 
     Spatially relative terms, such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Embodiments are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.