JP2008194596A - Filter cartridge and water purifier equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter cartridge capable of being densely filled with activated carbon and extended in its life, and a water purifier equipped with it. <P>SOLUTION: At the time of filling of activated carbon, the opening end part of an outer cylinder 29 is directed upward and one end part of an inner cylinder 26 is closed by a cap 27. The outer cylinder 29 is filled with the activated carbon 40 so as to cover one end part of the inner cylinder 26. At this time, the activated carbon 40 may be charged in the inner cylinder 26 while applying vibration to the inner cylinder 26 using an oscillator or the like. Succeedingly, a closure member 30 is pushed in the outer cylinder 29 from its opening end part. By this constitution, the whole of the charged activated carbon 40 is pressed to turn denser. The upper end part of the outer cylinder 29 is bent inward at the edge part of the closure member 30 to be pressed to the upper surface of the closure member 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filtration cartridge mainly for purifying tap water and a water purifier provided with the same.

  In recent years, water purifiers for purifying tap water and the like have been widely used in restaurants and general households. As a water purifier, a water purifier having a replaceable filtration cartridge is generally used. The filtration cartridge is filled with activated carbon for adsorbing and removing impurities, for example.

  In the filtration cartridge described in Patent Document 1, a tubular first water passage member is accommodated in a tubular cartridge case, and the first water passage member includes an inner portion of the first water passage member. A cylindrical second water passage member is disposed so as to be separated from the peripheral surface. A first holding plate is provided at one end of the first and second water flow members, and one end of the first and second water flow members is held by the first holding plate.

A second holding plate having a hollow portion at the center is provided at the other ends of the first and second water passage members. The other end portions of the first and second water passage members are held by the second holding plate. The cylindrical space between the first water passage member and the second water passage member is filled with granular activated carbon or cylindrical activated carbon (molded activated carbon), and an activated carbon layer is provided. It has been.
JP 2005-199219 A

  The activated carbon filled in the filtration cartridge is preferably granular rather than shaped. This is because the molded activated carbon contains a certain amount of binder, so that the amount of adsorption per unit volume is smaller than that of granular activated carbon.

  By the way, in the filtration cartridge of the above-mentioned patent document 1, activated carbon is filled in a fixed volume space formed by the first water passage member, the second water passage member, the first holding plate and the second holding plate. The It is difficult to close-pack the granular activated carbon in such a constant volume space, and voids such as cracks are usually easily formed. In this case, the water flow resistance around the gap is reduced, and water flows unevenly in that portion. Thereby, the performance of the activated carbon around the gap is intensively reduced, and the life of the filtration cartridge is shortened.

  An object of the present invention is to provide a filtration cartridge capable of being closely packed with activated carbon and realizing a long life, and a water purifier including the same.

  (1) A filtration cartridge according to a first aspect of the present invention includes a liquid-permeable outer cylinder, a liquid-permeable inner cylinder inserted into the outer cylinder, and one end of the outer cylinder from one end of the inner cylinder. A first holding member that holds the other end of the outer cylinder and the other end of the inner cylinder so as to protrude in the axial direction and has a communication hole at the opening of the other end of the inner cylinder, and one end of the inner cylinder A first closing member that closes the opening of the part, and a second closing member that is fitted inside the outer cylinder so as to close the opening of the one end part of the outer cylinder with a space between the one end part of the inner cylinder The inner space surrounded by the inner peripheral surface of the outer cylinder, the outer peripheral surface of the inner cylinder, the first closing member and the second closing member is filled with activated carbon.

  In this filtration cartridge, the inner cylinder is inserted into the outer cylinder, and the other end of the outer cylinder and the other end of the inner cylinder are arranged such that one end of the outer cylinder protrudes in the axial direction from one end of the inner cylinder. It is held by the first holding member. The opening at one end of the inner cylinder is closed by the first closing member. In addition, the second closing member is fitted inside the outer cylinder so as to close the opening at the one end of the outer cylinder with a space between the one end of the inner cylinder. The inner space surrounded by the inner peripheral surface of the outer cylinder, the outer peripheral surface of the inner cylinder, the first closing member, and the second closing member is filled with activated carbon.

  At the time of assembly, activated carbon is filled in the inner peripheral surface of the outer cylinder, the outer peripheral surface of the inner cylinder, and the inner space surrounded by the first closing member and the second closing member, and then the second closing member is fitted inside the outer cylinder. . At this time, the activated carbon can be pressed by the second closing member. Thereby, the packing density of activated carbon can be increased, and formation of voids such as cracks can be prevented.

  The liquid supplied from the outside enters the space filled with activated carbon through the outer cylinder. Then, impurities contained in the liquid are adsorbed and removed by the activated carbon. The liquid from which the impurities have been removed is guided to the space inside the inner cylinder through the inner cylinder, and is discharged from the communication hole of the first holding member.

  In this case, since the activated carbon is packed at a high density, the liquid that has entered the space filled with the activated carbon is prevented from flowing in a part of the activated carbon. Thereby, since the area | region of the used activated carbon disperse | distributes uniformly, the fall of the local performance of activated carbon can be suppressed. As a result, the lifetime of the filtration cartridge can be extended.

  Moreover, since the one end part of an outer cylinder protrudes in an axial direction rather than the one end part of an inner cylinder, activated carbon is filled also into the inside of the one end part which the outer cylinder protruded. As a result, the liquid can flow from the projecting one end of the outer cylinder to the inside of the inner cylinder through the region near the one end of the inner cylinder. For this reason, there is no region in which the liquid hardly passes in the vicinity of one end of the inner cylinder. As a result, the filled activated carbon can be used effectively.

  (2) One end portion of the inner cylinder is disposed at a central portion in the radial direction of the outer cylinder, and the interval between the one end portion of the inner cylinder and the second closing member is in the radial direction between the inner cylinder and the outer cylinder. It may be 0.5 to 1 times the interval.

  In this case, the liquid protruded from the outer cylinder because the distance between the one end portion of the inner cylinder and the second closing member is 0.5 times or more the radial distance between the inner cylinder and the outer cylinder. It can flow from one end to the inside of the inner cylinder through a region near one end of the inner cylinder. For this reason, there is no region in which the liquid hardly passes in the vicinity of one end of the inner cylinder. As a result, the filled activated carbon can be used effectively.

  In addition, since the distance between the one end portion of the inner cylinder and the second closing member is equal to or less than one time the radial distance between the inner cylinder and the outer cylinder, the liquid is generated in the protruding one end portion of the outer cylinder. The amount of activated carbon that is not effectively used without passing through is suppressed. Therefore, it becomes possible to purify more liquid while suppressing an increase in cost.

  (3) The filtration cartridge may further include a second holding member that holds one end of the inner cylinder at a central position in the radial direction of the outer cylinder.

  In this case, by holding the one end portion of the inner cylinder at the center position in the radial direction of the outer cylinder by the second holding member, the charged region of activated carbon is ensured uniformly in the circumferential direction. Thereby, the liquid can be purified efficiently.

  (4) The filtration cartridge further includes a first housing member having a first housing space through which liquid discharged from the communication hole of the first holding member is guided, and a hollow fiber membrane housed in the first housing member. May be.

  In this case, particles such as bacteria and iron rust contained in the liquid discharged from the communication hole of the first holding member can be removed by the hollow fiber membrane in the first housing space of the first housing member.

  (5) The filtration cartridge further includes a second storage member having a second storage space through which the liquid discharged from the communication hole of the first holding member is guided, and an ion exchange material stored in the second storage member. May be.

  In this case, in the second housing space of the second housing member, metal ions such as lead ions contained in the liquid discharged from the communication hole of the first holding member can be removed by the ion exchange material.

  (6) The first holding member and the second housing member may be integrally formed. In this case, the assembly of the filtration cartridge is facilitated as compared with the case where the first holding member and the second housing member are provided separately. Further, the filter cartridge can be downsized.

  (7) The inner cylinder may be made of a nonwoven fabric. In this case, the activated carbon can be reliably prevented from passing through the inner cylinder, and the liquid can easily pass through the inner cylinder. In addition, since the thermoformed nonwoven fabric has shape retention, assembly work is facilitated and reliability is improved.

  (8) The outer cylinder may be made of a nonwoven fabric. In this case, the activated carbon can be reliably prevented from passing through the outer cylinder, and the liquid can easily pass through the outer cylinder. In addition, since the thermoformed nonwoven fabric has shape retention, assembly work is facilitated and reliability is improved.

  (9) One end portion of the outer cylinder may be bent inward. In this case, it is possible to reliably prevent the second closing member from dropping or shifting. Thereby, the activated carbon is maintained in a high density state.

  (10) A water purifier according to a second aspect of the present invention includes a filtration cartridge according to the first aspect of the present invention, a storage case that has a liquid inlet and a liquid outlet, and stores the filtration cartridge. A first flow path for guiding the liquid supplied from the liquid inlet to the outer peripheral region of the outer cylinder, and a second flow path for guiding the liquid discharged from the communication hole of the first holding member of the filtration cartridge to the liquid outlet. Formed, and the first flow path and the second flow path are separated.

  In this water purifier, the liquid before purification is supplied from the liquid inlet of the housing case, and is guided to the outer peripheral region of the outer cylinder of the filtration cartridge through the first flow path. The liquid purified by the filtration cartridge is discharged from the communication hole of the first holding member and guided to the liquid outlet through the second flow path.

  In the filtration cartridge, the inner cylinder is inserted into the outer cylinder, and the other end of the outer cylinder and the other end of the inner cylinder are arranged so that one end of the outer cylinder protrudes in the axial direction from one end of the inner cylinder. 1 is held by a holding member. The opening at one end of the inner cylinder is closed by the first closing member. In addition, the second closing member is fitted inside the outer cylinder so as to close the opening at the one end of the outer cylinder with a space between the one end of the inner cylinder. The inner space surrounded by the inner peripheral surface of the outer cylinder, the outer peripheral surface of the inner cylinder, the first closing member, and the second closing member is filled with activated carbon.

  At the time of assembly, activated carbon is filled in the inner peripheral surface of the outer cylinder, the outer peripheral surface of the inner cylinder, and the inner space surrounded by the first closing member and the second closing member, and then the second closing member is fitted inside the outer cylinder. . At this time, the activated carbon can be pressed by the second closing member. Thereby, the packing density of activated carbon can be increased, and formation of voids such as cracks can be prevented.

  The liquid supplied from the outside enters the space filled with activated carbon through the outer cylinder. Then, impurities contained in the liquid are adsorbed and removed by the activated carbon. The liquid from which the impurities have been removed is guided to the space inside the inner cylinder through the inner cylinder, and is discharged from the communication hole of the first holding member.

  In this case, since the activated carbon is packed at a high density, the liquid that has entered the space filled with the activated carbon is prevented from flowing in a part of the activated carbon. Thereby, since the area | region of the used activated carbon disperse | distributes uniformly, the fall of the local performance of activated carbon can be suppressed. As a result, the lifetime of the filtration cartridge can be extended.

  Moreover, since the one end part of an outer cylinder protrudes in an axial direction rather than the one end part of an inner cylinder, activated carbon is filled also into the inside of the one end part which the outer cylinder protruded. As a result, the liquid can flow from the projecting one end of the outer cylinder to the inside of the inner cylinder through the region near the one end of the inner cylinder. For this reason, there is no region in which the liquid hardly passes in the vicinity of one end of the inner cylinder. As a result, the filled activated carbon can be used effectively.

  According to the present invention, the packing density of activated carbon can be increased, and formation of voids such as cracks can be prevented. Thereby, the liquid that has entered the space filled with activated carbon is prevented from flowing in a part of the activated carbon. Therefore, since the area | region of the used activated carbon disperse | distributes uniformly, the fall of the local performance of activated carbon can be suppressed. As a result, the lifetime of the filtration cartridge can be extended.

  Hereinafter, the filtration cartridge concerning one embodiment of the present invention and a water purifier provided with the same are explained, referring to drawings.

(1) Attachment state of water purifier FIG. 1 and FIG. 2 are external views of a water purifier according to an embodiment of the present invention. FIG. 1 is a front view of a water purifier attached to a sink, and FIG. 2 is a side view of the water purifier of FIG.

  As shown in FIGS. 1 and 2, the sink 100 is provided with a top plate 101 extending horizontally. The water purifier 1 is attached so as to penetrate the top plate 101 and extend vertically. The water purifier 1 contains a filtration cartridge 10 (FIG. 2). The water purifier 1 is fixed to the top plate 101 by fastening a nut 102 on the lower surface side of the top plate 101. A substantially cylindrical operation unit 2 is provided on the side surface of the water purifier 1, and an operation switch (not shown) for operating a later-described electromagnetic valve 121 is disposed on the operation unit 2.

  In the vicinity of the water purifier 1, a cleaning unit 110 for receiving and discharging tap water is provided. The cleaning unit 110 is formed by bending the top plate 101 into a concave shape by pressing or the like. A drain port (not shown) is formed on the bottom surface of the cleaning unit 110. On the upper portion of the water purifier 1, a water discharge pipe 3 that is curved and extends above the cleaning unit 110 is attached so as to be turnable to the left and right. At the tip of the water discharge pipe 3, a water discharge port 3a for discharging tap water downward is provided. A connecting pipe 4 is attached to the lower end of the water purifier 1, and one end of a water supply pipe 103 made of, for example, a bendable resin material is connected to the connecting pipe 4.

  Below the water purifier 1, an electromagnetic valve housing part 120 in which the electromagnetic valve 121 and its control board (not shown) are housed is disposed. Connection pipes 122 and 123 are attached to the electromagnetic valve 121. The other end of the water supply pipe 103 is connected to the connection pipe 122. The operation unit 2 and the electromagnetic valve housing unit 120 are connected via a wiring (not shown), and the opening and closing of the electromagnetic valve 121 can be switched by switching on and off the operation switch on the operation unit 2. In addition, you may provide the other operation means which can adjust the opening degree of the solenoid valve 121 instead of an operation switch.

  A water stop cock 126 is provided below the top plate 101. A water pipe (not shown) is connected to the upstream side of the stop cock 126. A branch connection 127 for branching tap water supplied from the water pipe in two directions is attached to the downstream side of the stop cock 126. One end of a water supply pipe 129 is connected to one outlet of the branch connection portion 127 via a branch stop cock 128. The other end of the water supply pipe 129 is connected to the connection pipe 123. One end of the water supply pipe 130 is connected to the other outlet of the branch connection portion 127. The other end of the water supply pipe 130 is connected to, for example, a raw water faucet (not shown) for discharging tap water as raw water.

  Opening and closing the stop cock 126 switches between a state in which tap water is supplied from the water pipe (not shown) to the sink 100 and a state in which the supply of tap water to the sink 100 is stopped. Moreover, the state in which tap water is supplied to the water purifier 1 and the state in which the supply of tap water to the water purifier 1 is stopped are switched by opening and closing the branch stop cock 128.

(2) Configuration of Filtration Cartridge Next, the configuration of the filtration cartridge 10 built in the water purifier 1 will be described. FIG. 3 is an exploded perspective view of the filtration cartridge 10 built in the water purifier 1, and FIG. 4 is a cross-sectional view of the filtration cartridge 10.

  As shown in FIG. 3, the filtration cartridge 10 includes an O-ring 21, a hollow fiber case 22, an ion removing member 23, an O-ring 24, a connecting case 25, an inner cylinder 26, a cap 27, a positioning plate 28, an outer cylinder 29, and A closing member 30 is included. Each of these members is disposed along a common axis J.

  The hollow fiber case 22 has a substantially cylindrical shape, and a ring mounting groove 221 is formed along the circumferential direction on the outer peripheral surface in the vicinity of the upper end portion thereof. An O-ring 21 is attached to the ring attachment groove 221. In the vicinity of the lower end portion of the hollow fiber case 22, a pair of cutout portions 222 extending in a predetermined length along the circumferential direction are formed symmetrically with respect to the axis J. In FIG. 3, only one cutout 222 is shown. A locking portion 223 is formed near one end of each cutout portion 222 so as to protrude downward from the upper edge portion. A sliding groove 224 is formed so as to extend downward from the vicinity of the other end of each cutout portion 222 along the inner peripheral surface of the hollow fiber case 22.

  The ion removing member 23 is made of fibrous activated carbon and ion exchange fibers, and these mixed materials are formed into a sheet shape and further wound into a cylindrical shape. The connection case 25 has a substantially cylindrical shape with a diameter smaller than that of the hollow fiber case 22 and accommodates the ion removing member 23.

  A ring mounting groove 251 is formed along the circumferential direction on the outer peripheral surface near the upper end of the connection case 25. An O-ring 24 is attached to the ring attachment groove 251. A protrusion 252 is formed along the circumferential direction below the ring mounting groove 251. In addition, a pair of convex portions 253 projecting outward are formed symmetrically with respect to the axis J on the ridge portion 252. In FIG. 3, only one convex portion 253 is shown. The connection case 25 is connected to the lower end portion of the hollow fiber case 22.

  The inner cylinder 26 and the outer cylinder 29 are made of a material having liquid permeability and capable of preventing the passage of granular activated carbon. In the present embodiment, a nonwoven fabric is used as the material for the inner cylinder 26 and the outer cylinder 29. The inner diameter of the outer cylinder 29 is larger than the outer diameter of the inner cylinder 26, and the longitudinal length of the outer cylinder 29 is larger than the longitudinal length of the inner cylinder 26. With the inner cylinder 26 accommodated in the outer cylinder 29, the upper ends of the inner cylinder 26 and the outer cylinder 29 are attached to the lower end of the connection case 25. As will be described later, granular activated carbon is filled between the inner cylinder 26 and the outer cylinder 29.

  The cap 27 includes a cylindrical inner cylinder fitting portion 271, a disk-like protruding portion 272, and a tapered plate fixing portion 273. The outer diameter of the inner cylinder fitting portion 271 is substantially equal to the inner diameter of the inner cylinder 26, and the outer diameter of the protruding portion 272 is larger than the outer diameter of the inner cylinder 26. The positioning plate 28 has a substantially disk shape, and its outer diameter is substantially equal to the inner diameter of the outer cylinder 29. A fitting hole 281 is formed at the center of the positioning plate 28, and a plurality (four in this example) of communication holes 282 are formed symmetrically with respect to the axis J so as to surround the fitting hole 281. Yes. The cap 27 and the positioning plate 28 are attached to the lower end portion of the inner cylinder 26. The closing member 30 has a substantially annular shape having a bottom surface, and is attached to the lower end portion of the outer cylinder 29.

  Next, the internal structure of each member described above and the assembly method thereof will be described. As shown in FIG. 4, a hollow fiber membrane housing space 226 that opens upward is formed in the hollow fiber case 22. In the hollow fiber membrane accommodating space 226, a plurality of hollow fiber membranes 50 are accommodated in a U shape. A plurality of communication holes 228 are formed symmetrically with respect to the axis J at the bottom of the hollow fiber case 22. A concave fitting portion 227 is formed at the lower end portion of the hollow fiber case 22, and the upper end portion of the connection case 25 is fitted into the fitting portion 227.

  During actual assembly, first, the convex portion 253 (FIG. 3) of the connection case 25 is fitted into the cutout portion 222 through the sliding groove 224 (FIG. 3) of the hollow fiber case 22, whereby the upper end portion of the connection case 25 is hollow. The yarn case 22 is fitted into the fitting portion 227 (FIG. 4). Further, the connection case 25 and the hollow fiber case 22 are rotated relative to each other around the axis J, so that the convex portion 253 of the connection case 25 is circumferential in the cutout portion 222 (FIG. 3) of the hollow fiber case 22. Move to. Thereby, the convex part 253 is latched by the latching | locking part 223 (FIG. 3), and the connection case 25 and the hollow fiber case 22 are mutually fixed. In a state where the connection case 25 and the hollow fiber case 22 are connected, the lower end surface of the hollow fiber case 22 and the lower surface of the protrusion 252 of the connection case 25 are located on the same plane.

  A removal member accommodation space 255 that opens upward is formed in the connection case 25. The ion removing member 23 is accommodated in the removing member accommodating space 255. The removal member accommodation space 255 communicates with the hollow fiber membrane accommodation space 226 through the communication hole 228.

  A communication hole 257 is formed at the center of the bottom portion 256 of the connection case 25. An annular inner cylinder holding groove 258 is formed on the lower surface of the bottom portion 256 so as to surround the communication port 257, and an annular outer cylinder holding groove 259 is formed so as to surround the inner cylinder holding groove 258. ing. The upper end of the inner cylinder 26 is fitted into the inner cylinder holding groove 258, and the upper end of the outer cylinder 29 is fitted into the outer cylinder holding groove 259. The removal member accommodation space 255 communicates with the inner cylinder 26 through the communication port 257.

  The inner cylinder fitting portion 271 of the cap 27 is fitted to the lower end portion of the inner cylinder 26. Further, a plate 28 is attached to the plate fixing portion 273 of the cap 27 so as to be positioned perpendicular to the axis J. The positioning plate 28 holds the lower end portion of the inner cylinder at a central position in the radial direction of the outer cylinder 29. The lower end portion of the outer cylinder 29 is closed by the closing member 30.

  During actual assembly, first, the plate fixing portion 273 of the cap 27 is fitted into the fitting hole 281 (FIG. 3) of the positioning plate 28, whereby the positioning plate 28 is fixed to the cap 27. Subsequently, the inner cylinder fitting portion 271 of the cap 27 is fitted to the lower end portion of the inner cylinder 26. Then, the inner cylinder 26 is inserted into the outer cylinder 29. In this state, the upper ends of the inner cylinder 26 and the outer cylinder 29 are attached to the inner cylinder holding groove 258 and the outer cylinder holding groove 259 of the connection case 15.

  An activated carbon filling space 39 is formed between the inner cylinder 26 and the outer cylinder 29. The activated carbon filling space 39 is filled with a predetermined amount of granular activated carbon 40.

  Here, the filling method of activated carbon is demonstrated in detail using FIG. FIG. 5 is a process diagram for explaining a filling method of the activated carbon 40. As shown in FIG. 5A, the open end (the lower end in FIG. 4) of the outer cylinder 29 is directed upward in a state where the closing member 30 of FIG. 4 is not attached to the outer cylinder 29. One end portion (the lower end portion in FIG. 4) of the inner cylinder 26 is closed by a cap 27. As shown in FIG. 5B, the outer cylinder 29 is filled with activated carbon 40 so as to cover one end of the inner cylinder 26. At this time, the activated carbon 40 may be filled while applying vibration using a vibrator or the like.

  Subsequently, as shown in FIG. 5C, the closing member 30 is pushed in from the opening end portion of the outer cylinder 29. Thereby, the whole activated carbon 40 with which it filled is pressed, and it will be in a denser state. Then, as shown in FIG. 5D, the upper end portion of the outer cylinder 29 is bent inward at the edge of the closing member 30 by an iron or the like and pressed against the upper surface of the closing member 30. As a result, the occlusion member 30 is prevented from dropping off and shifting, and the activated carbon 40 is maintained in a dense state.

  In the case where a nonwoven fabric is used as the material of the outer cylinder 29, the outer diameter of the closing member 30 may be set slightly larger than the inner diameter of the outer cylinder 29. In this case, the closing member 30 is more reliably fixed by the elasticity of the nonwoven fabric.

(3) Effect | action by water purifier FIG. 6: is sectional drawing of the water purifier 1 of the state in which the filtration cartridge 10 was incorporated. In addition, in FIG. 6, the water purifier 1 is divided | segmented up and down, and each part is shown to Fig.6 (a) and FIG.6 (b).

  First, the internal structure of the water purifier 1 will be described. As shown in FIGS. 6A and 6B, the filtration cartridge 10 is accommodated in a substantially cylindrical cartridge case 1a. The cartridge case 1 a includes a detachable cover 51, an upper cover 52, an inner wall member 53, a lower cover 54, an inner cover 55 and a bottom member 57.

  The inner wall member 53 is fitted in the upper cover 52. A detachable cover 51 is connected to upper ends of the upper cover 52 and the inner wall member 53 by screws or the like. When replacing the filtration cartridge 10, the detachable cover 51 is removed from the upper cover 52 and the inner wall member 53. The water discharge pipe 3 shown in FIG. 1 is inserted along the axis J at the upper end of the detachable cover 51.

  The lower end portion of the upper cover 52 is in contact with the upper surface of the top plate 101. The inner wall member 53 penetrates the top plate 101 and protrudes downward. A nut 102 is fastened to the inner wall member 53 on the lower surface side of the top plate 101. A cylindrical inner cover 55 is attached to the lower end portion of the inner wall member 53. The connecting pipe 4 shown in FIGS. 1 and 2 is connected to the lower end portion of the inner cover 55. A lower cover 54 is attached in the vicinity of the lower end portion of the outer peripheral surface of the inner wall member 53 so as to surround the inner cover 55. A bottom member 57 is attached to the lower end portion of the lower cover 53. The connecting pipe 4 extends downward through the bottom member 57.

  The outer peripheral surface of the hollow fiber case 22 of the filtration cartridge 10 is in contact with the inner peripheral surfaces of the attachment / detachment cover 51 and the inner wall member 53. The outer peripheral surface of the connection case 25 is in contact with the inner peripheral surface of the inner wall member 53. These abutting portions are maintained in a watertight state. A flow path P <b> 4 is formed in the upper cover 52 along the upper end portion of the hollow fiber case 22.

  A step portion 53 a is formed on the inner peripheral surface of the inner wall member 53. The filtration cartridge 10 is supported by the lower end surface of the hollow fiber case 22 and the lower surface of the protruding portion 252 of the connection case 25 coming into contact with the stepped portion 53a.

  The outer cylinder 29 is located inside the inner cover 55. A slight gap P <b> 1 is formed between the outer cylinder 29 and the inner cover 55. The gap P <b> 1 communicates with the internal flow path P <b> 2 of the connecting pipe 4 below the outer cylinder 29.

  Next, the effect | action by the water purifier 1 is demonstrated, referring FIG. In the following description, tap water before being purified by the water purifier 1 is referred to as raw water. When the solenoid valve 121 is opened by operating the operation lever 2 shown in FIG. 1, raw water is supplied to the internal flow path P2 of the connection pipe 4 through the water supply pipe 103 (FIG. 1). The raw water is guided into the inner cover 55 and fills the gap P <b> 1 between the outer cylinder 29 and the inner cover 55. As the water pressure in the gap P <b> 1 increases, the raw water enters the activated carbon filling space 39 through the outer cylinder 29. In the activated carbon filling space 39, residual chlorine contained in the raw water, organic matter that causes a strange odor, and the like are adsorbed and removed by the activated carbon 40.

  The raw water filtered by the activated carbon 40 (hereinafter referred to as first purified water) is guided through the inner cylinder 26 to the flow path P3 in the inner cylinder 26. The first purified water flows into the removal member accommodation space 255 in the connection case 22 through the communication hole 257. In the removal member accommodation space 255, the first purified water passes through the ion removal member 23, thereby removing metal ions such as lead ions contained in the first purified water.

  Water that has passed through the ion removing member 23 (hereinafter referred to as second purified water) is guided to the hollow fiber membrane housing space 226 of the hollow fiber case 22 through the communication port 228. In the hollow fiber membrane accommodating space 226, particles such as bacteria and iron rust contained in the second purified water are removed by the hollow fiber membrane 50. The second purified water that has passed through the hollow fiber membrane 50 is guided into the water discharge pipe 3 from the upper opening of the hollow fiber case 22 through the flow path P4, and the sink 100 is washed from the water discharge port 3a (FIG. 1) at the tip of the water discharge pipe 3. Water is discharged toward the unit 110 (FIG. 1).

(4) Charging amount of activated carbon Next, the filling amount of the activated carbon 40 in the activated carbon filling space 39 will be described in detail. FIG. 7 is a schematic diagram for explaining the filling amount of the activated carbon 40. As shown in FIG. 7A, in the present embodiment, the distance L1 between the lower end portion of the inner cylinder 26 and the closing member 30 in the state where the activated carbon 40 is pressed by the closing member 30 is set to be equal to the inner cylinder 26. The amount of the activated carbon 40 is adjusted to be 0.5 to 1 times the radial distance L2 between the outer cylinder 29 and the outer cylinder 29. In this case, it becomes possible to filter more raw water while suppressing an increase in cost. The reason will be described below. 7B shows a case where the distance L1 between the lower end portion of the inner cylinder 26 and the closing member 30 is substantially zero.

  In the water purifier 1, the raw water supplied into the inner cover 55 (FIG. 6) enters the activated carbon filling space 39 obliquely upward by the supply pressure. Therefore, as shown in FIG. 7B, when the distance L1 is short, the activated carbon 40 around the lower end of the inner cylinder 26 is not used effectively (see the dotted line area E1 in FIG. 7B).

  On the other hand, as shown in FIG. 7A, when the distance L1 is set to the above range, the raw water passes through the region between the positioning plate 28 and the closing member 30 and is It also penetrates into the area around the lower end of 26. Therefore, more activated carbon 40 is used more effectively than in the case shown in FIG. Thereby, more raw water can be filtered. If the distance L1 is too long, the amount of the activated carbon 40 that is not used effectively in the region between the positioning plate 28 and the closing member 30 increases. Therefore, useless cost arises.

  Thus, by setting the distance L1 within the above range, more activated carbon 40 can be used efficiently and effectively. Thereby, more raw water can be filtered while suppressing an increase in cost.

  As shown in FIG. 7C, by forming the upper surface of the closing member 30 in a tapered shape, more raw water can be filtered as in the case shown in FIG. 7A. It is also considered. However, in the vicinity of the tapered portion of the closing member 30, it becomes difficult to fill the activated carbon 40 in the most dense manner. Therefore, in this case, the purification capacity of the filtration cartridge 10 is reduced as compared with the case shown in FIG.

(4-a) Example The filling amount of the activated carbon 40 was set to various values, and a residual chlorine filtering ability test based on JIS S 3201 was performed. FIG. 8 is a diagram showing the results of a residual chlorine filtering ability test. In FIG. 8, the horizontal axis indicates the distance L1, and the vertical axis indicates the amount of filtered water by the filtration cartridge 10. Here, the distance L2 in the radial direction between the inner cylinder 26 and the outer cylinder 29 was set to 10 mm. In addition, as above-mentioned, the filling amount of the activated carbon 40 is so large that the distance L1 is large.

  As shown in FIG. 8, the amount of filtered water by the filtration cartridge 10 increased by setting the distance L1 in the range of 5 mm to 10 mm. If the distance L1 exceeds 10 mm, the amount of activated carbon 40 that is not effectively used in the region between the closing member 30 and the inner cylinder 26 increases, resulting in useless costs. Therefore, it was found that it is preferable to set the distance L1 to 5 mm to 10 mm, that is, to adjust the filling amount of the activated carbon 40 so that the distance L1 is 0.5 to 1 times the distance L2.

(5) Effects of the present embodiment In the present embodiment, one end of the inner cylinder 26 is closed by the cap 27 and the activated carbon 40 is filled so as to cover the one end of the inner cylinder 26. Then, the activated carbon filling space 39 is closed while pressing the entire activated carbon 40 by the closing member 30. Thereby, since the whole activated carbon 40 is maintained in a dense state, it is prevented that raw water of tap water flows in a part of the activated carbon 40. Therefore, the area | region of the activated carbon 40 used is disperse | distributed uniformly, and the fall of the local performance of the activated carbon 40 is suppressed. As a result, the life of the filtration cartridge 10 is extended.

  In the present embodiment, the distance L1 between the lower end portion of the inner cylinder 26 and the closing member 30 is 0.5 to 1 times the radial distance L2 between the inner cylinder 26 and the outer cylinder 29. The amount of activated carbon 40 is adjusted so that Thereby, when raw water of tap water passes through the activated carbon filling space 39, more activated carbon 40 is used efficiently and effectively. Therefore, it becomes possible to filter more raw water while suppressing an increase in cost.

(6) Other Embodiments In the above embodiment, a nonwoven fabric is used as the material of the inner cylinder 26 and the outer cylinder 29. Other materials that can be used may be used. For example, a wire mesh sintered filter obtained by stacking and sintering many metal meshes made of stainless steel, a powder sintered filter obtained by sintering stainless steel powder, a resin sintered filter, or the like may be used.

  In the above embodiment, metal ions such as lead ions contained in the raw water are removed by the ion removing member 23 housed in the connection case 25, but the metal ions may be removed by other configurations. For example, it is good also as a structure which removes a metal ion by filling the activated carbon filling space 39 with what cut | disconnected the ion exchange fiber finely with granular activated carbon. Moreover, you may use the ceramic for ion exchange etc. instead of an ion exchange fiber.

  Moreover, in the said embodiment, although the edge part of the outer cylinder 29 is bent inward until it contacts the upper surface of the closure member 30, it is not limited to this, For example, as shown in FIG. You may shape | mold the edge part of the outer cylinder 29 in a taper shape using a casting_mold | template etc.

  In the above embodiment, the hollow fiber case 22 and the connection case 25 are separate members, but the hollow fiber case 22 and the connection case 25 may be integrally formed and used as a common member.

  Moreover, in the said embodiment, although the inner cylinder 26 and the outer cylinder 29 are hold | maintained by the connection case 25, you may provide the other member for hold | maintaining the inner cylinder 26 and the outer cylinder 29 separately.

  Moreover, although the case where this invention was applied to the undersink type water purifier was shown in the said embodiment, it is not limited to this, For example, you may apply this invention to a faucet direct connection type water purifier.

  Moreover, in the said embodiment, although the water purifier 1 is used in order to purify a tap water, it is not limited to this, For example, you may use the water purifier 1 in order to purify a drained liquid etc.

(7) Correspondence between each constituent element of claims and each element of the embodiment Hereinafter, an example of correspondence between each constituent element of the claims and each element of the embodiment will be described. It is not limited to.

  In the said embodiment, the connection case 25 is an example of a 1st holding member and a 2nd accommodating member, the cap 27 is an example of a 1st closure member, the closure member 30 is an example of a 2nd closure member, However, the plate 28 is an example of the second holding member, the hollow fiber membrane housing space 226 is an example of the first housing space, the hollow fiber case 22 is an example of the first housing member, and the removal member housing space 255 is the first housing space. 2 is an example of a storage space, the ion removal member 23 is an example of an ion exchange material, the cartridge case 1a is an example of a storage case, the gap P1 is an example of a first flow path, and the flow path P4 is a second flow path. It is an example of a flow path.

  As each constituent element in the claims, various other elements having configurations or functions described in the claims can be used.

  The present invention can be used to purify tap water, drainage liquid, or the like in restaurants or general households.

It is an external view of the water purifier which concerns on one embodiment of this invention. It is an external view of the water purifier which concerns on one embodiment of this invention. It is a disassembled perspective view of the filtration cartridge incorporated in a water purifier. It is sectional drawing of a filtration cartridge. It is process drawing for demonstrating the filling method of activated carbon. It is sectional drawing of the water purifier in the state where the filtration cartridge was incorporated. It is a schematic diagram for demonstrating the filling amount of activated carbon. It is a figure which shows the result of the filtration capability test of residual chlorine. It is a figure for demonstrating other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water purifier 1a Cartridge case 10 Filtration cartridge 22 Hollow fiber case 23 Ion removal member 25 Connection case 26 Inner cylinder 27 Cap 28 Positioning plate 29 Outer cylinder 30 Closure member 39 Activated carbon filling space 40 Activated carbon 50 Hollow fiber membrane 100 Sink 226 Hollow fiber Membrane accommodation space 255 Removal member accommodation space

Claims (10)

An outer cylinder having liquid permeability;
An inner cylinder having liquid permeability inserted into the outer cylinder;
The other end of the outer cylinder and the other end of the inner cylinder are held so that one end of the outer cylinder protrudes in the axial direction from the one end of the inner cylinder, and the other end of the inner cylinder A first holding member having a communication hole at the position of the opening;
A first closing member for closing the opening at the one end of the inner cylinder;
A second closing member fitted inside the outer cylinder so as to close the opening of the one end of the outer cylinder with a gap between the one end of the inner cylinder,
A filtration cartridge, wherein activated carbon is filled in an inner space surrounded by an inner peripheral surface of the outer cylinder, an outer peripheral surface of the inner cylinder, the first closing member, and the second closing member. The one end portion of the inner cylinder is disposed at a central portion in the radial direction of the outer cylinder,
The distance between the one end portion of the inner cylinder and the second closing member is 0.5 to 1 times the distance in the radial direction between the inner cylinder and the outer cylinder. The filtration cartridge according to 1. The filtration cartridge according to claim 1, further comprising a second holding member that holds the one end portion of the inner cylinder at a central position in a radial direction of the outer cylinder. A first housing member having a first housing space through which liquid discharged from the communication hole of the first holding member is guided;
The filtration cartridge according to any one of claims 1 to 3, further comprising a hollow fiber membrane housed in the first housing member. A second housing member having a second housing space through which liquid discharged from the communication hole of the first holding member is guided;
The filtration cartridge according to any one of claims 1 to 4, further comprising an ion exchange material accommodated in the second accommodation member. The filtration cartridge according to claim 1, wherein the first holding member and the second housing member are integrally formed. The filtration cartridge according to claim 1, wherein the inner cylinder is made of a nonwoven fabric. The filtration cartridge according to claim 1, wherein the outer cylinder is made of a nonwoven fabric. The filtration cartridge according to any one of claims 1 to 8, wherein the one end portion of the outer cylinder is bent inward. The filtration cartridge according to any one of claims 1 to 9,
A storage case that has a liquid inlet and a liquid outlet, and stores the filtration cartridge;
In the storage case, a liquid that is supplied from the liquid inlet of the storage case to the outer peripheral area of the outer cylinder, and a liquid that is discharged from a communication hole of the first holding member of the filtration cartridge The water purifier is characterized in that the second flow path leading to the liquid outlet is formed, and the first flow path and the second flow path are separated.

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