JP2010142764A - Water-purifier filter cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-purifier filter cartridge consisting of a ceramic filter body and a filter case, wherein a problem of passage blocking is solved without depending on a means that a gap W between a ring packing for holding the periphery of the upper end part of the filter body and the filter case is widened. <P>SOLUTION: The water-purifier filter cartridge consists of the filter body 1, which forms a plurality of penetrated holes 9, having the inner peripheral surface as a filtration surface, in the axial direction of the cylindrical porous ceramic body, has the lower end surface of the porous ceramic body as a raw-water inflow part and the upper end surface of it as a water discharge prevention part, and forms a purified-water discharge part in the side surface part; and the filter case 2 for receiving the filter body 1. The filter body 1 is engaged inside the filter case 2 in the state that the periphery of a lower end part and the periphery of the upper end part are held by the ring packing 5. A packing-shape holding part 5a is projected in a predetermined pitch circumferentially on the outer peripheral surface of the ring packing 5 of the upper part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water purifier filter cartridge which is incorporated in a water purifier mainly used at home and filters tap water or the like with a ceramic filter.

  As a ceramic filter for the water purifier as described above, as shown in FIG. 1, in the axial direction of the cylindrical porous ceramic body S, a large number of upper end sealing holes having an inner peripheral surface as a filtration surface are formed. A structure in which tap water L is injected and filtered from the lower end X1 and is taken out as purified water J from the other end X2 has been common. In addition, the filter main body which consists of porous ceramic bodies S is inserted in the inside of a filter case in the state hold | maintained at the lower end part periphery and upper end part periphery at the ring-shaped packing, and comprises the water purifier filter cartridge.

  However, in the structure shown in FIG. 1, the gas (air) that exists as bubbles in the tap water L to be purified or the gas (air) that exists inside the water purifier moves the filter body with the use for a certain period. There is a problem that the amount of purification is reduced as the effective filtration area of the filter is reduced by accumulating inside the upper end sealing hole of the porous ceramics constituting the integrated gas A. In addition, even after stopping the inflow of tap water, there is a problem that a small amount of purified water flows out of the water purifier due to the pressure of the accumulated gas A, resulting in deterioration of water drainage.

  Therefore, the present applicant has developed a filter cartridge (Patent Document 1) using a filter body having a structure shown in FIG. 2 in which a through-hole is formed in the porous ceramic body instead of the upper end sealing hole. This filter body has a structure in which tap water L to be purified is supplied from the lower end surface Y1, purified by passing through the filtration surface of the inner wall of the through hole, and taken out as purified water J from the side surface of the filter body. The portion other than the through-hole on the upper end surface of the porous ceramic body is sealed so that the tap water L and the purified water J to be purified do not mix.

  This filter cartridge includes a filter case 2 for housing the filter main body 1 therein, and is fitted into the filter case with the lower edge and the upper edge held by the ring-shaped packing 5 as in FIG. It is. Further, a lid portion 3 that covers the upper end portion Y2 and prevents the free running of tap water L is disposed above the upper end portion Y2 of the filter body 1. With this structure, the tap water L supplied from the lower end Y1 of the filter body 1 is dead-end filtered, and the purified water J is taken out from the side surface S side of the filter body 1. The lid 3 is provided with a gas selective permeable membrane 4 made of a material having nano-sized pores, and the gas accumulated in the space R formed by the lid 3 and the upper end Y2 of the filter body 1 is The gas can be discharged to the outside through the gas selective permeable membrane 4.

However, since this structure is a structure in which the purified water J is taken out from the side surface S side of the filter body 1, if the gap W between the ring-shaped packing 5 that holds the periphery of the upper end of the filter body 1 and the filter case 2 is small, When the pressure of the purified water flowing out from the side surface S side rises, the end of the ring-shaped packing 5 is turned up by the water flow as shown in FIG. There was a problem of doing. In addition, the water purification amount of the water purifier is proportional to the size of the ceramic filter, and the water purifier for general household use is required to have a structure that can be installed in a compact manner while securing the water purification amount. For this reason, it is necessary to keep the gap W as small as possible. In addition, the size of the filter case is required to be the same as that of the conventional type in order to be compatible with the size of the water purifier already installed in the home. Therefore, there is a problem that the method of solving the problem of the channel blockage by expanding the gap W by reducing the size of the filter body 1 and increasing the size of the filter case 2 is impractical and cannot be employed.
JP 2006-272112 A

  An object of the present invention is to solve the above-described conventional problems, and in a water purifier filter cartridge comprising a ceramic filter body and a filter case, a gap W between the ring-shaped packing that holds the periphery of the upper end of the filter body and the filter case. It is to provide a technology capable of solving the problem of the blockage of the purified water flow without using the means of spreading the water.

  The water purifier filter cartridge of the present invention, which has been made to solve the above problems, has a plurality of through-holes whose inner peripheral surface is a filtration surface in the axial direction of a cylindrical porous ceramic body, and the porous ceramic A water purifier filter cartridge comprising a filter main body in which a lower end surface of the body is a raw water inflow portion, an upper end surface is a water outflow prevention portion, and a water purification discharge portion is formed on a side surface portion, and a filter case that houses the filter main body, The filter body is fitted inside the filter case with the lower edge and the upper edge held by the ring packing, and the packing holding portion is arranged in the circumferential direction on the outer circumferential surface of the upper ring packing. It is characterized by projecting at a predetermined pitch.

  The invention according to claim 2 is characterized in that these packing-shaped holding portions have an arc-shaped or triangular horizontal cross-section in line contact with the filter case.

  Furthermore, the invention according to claim 3 is characterized in that, in the water purifier filter cartridge according to claim 1, a lid member having a gas permselective membrane is disposed in close contact with the upper portion of the filter body. The invention described in No. 4 is characterized in that the lid member has a dome shape and a gas selective permeable membrane is provided at the center thereof.

  Since the water purifier filter cartridge of the present invention has a structure in which packing shape holding portions protrude from the outer peripheral surface of the upper ring-shaped packing at a predetermined pitch in the circumferential direction, the purified water flowing out from the side surface S side of the filter main body. Even when the water pressure rises, the water flow can flow through the flow path formed between the packing-shaped holding portions, the end of the ring-shaped packing is turned up by the water flow, and the purified water that has flowed out from the side surface S side. The problem of blocking the flow path can be solved without using a means of widening the gap W between the ring packing that holds the periphery of the upper end of the filter body and the filter case.

  In addition, the work of fitting the ring-shaped packing into the gap between the filter and the filter case is performed manually. In the present invention, however, a packing-shaped holding portion is protruded from the outer circumferential surface of the ring-shaped packing at a predetermined pitch in the circumferential direction. As a result, compared to the case where the ring-shaped packing is a surface contact type, the fitting operation is facilitated and the working efficiency can be improved.

  According to the second aspect of the present invention, the tip end portion of the packing-shaped holding portion is easily deformed during fitting, and the fitting operation into the filter case is facilitated.

  According to the third aspect of the present invention, no gas is accumulated in the upper part of the filter main body, and when the purified water is taken out from the water purifier, the drainage of the purified water deteriorates or the effective area of the filter means decreases. Accordingly, it is possible to effectively avoid the problem that the amount of purification decreases. According to the invention of claim 4, the lid member is formed in a dome shape and the gas selective permeable membrane is provided in the central portion thereof, so that the gas can be collected in the central portion and reliably eliminated.

Preferred embodiments of the present invention are shown below.
4 is an overall configuration diagram of a ceramic filter cartridge for water purifier in the present embodiment, FIG. 5 is a schematic cross-sectional explanatory view of the ceramic filter cartridge for water purifier in the present embodiment, and FIG. 6 is a BB direction of FIG. FIG. 7 is an explanatory view of the structure of the filter body 1 used in the present invention, FIG. 7 (a) is a plan view, and FIG. 7 (b) is a side view.

  4 and 5, 1 is a filter body, 2 is a filter case, 3 is a lid member, 4 is a gas selective permeable membrane, 5 is a ring-shaped packing made of an elastic material, and 5a is projected on the outer periphery of the ring-shaped packing 5. The packing shape holding | maintenance part provided is shown. Also, 7 shown in FIG. 4 is an outer lid, and 10 is an activated carbon filling part.

  The ceramic filter cartridge for a water purifier of the present invention has a structure in which a filter body 1 is fitted inside a filter case 2 and fixed by an outer lid 7 screwed onto the upper part of the filter case 2. The filter case 2 is preferably a filter case made of a synthetic resin such as PP, ABS, PVDF, etc., which is easy to mold and easy to collect and recycle after use.

  As shown in FIG. 7, the filter main body 1 is made of a cylindrical porous ceramic body and has a monolith structure in which a large number of through holes 9 having an inner peripheral surface as a filtration surface are formed in the axial direction. The porous ceramic body is made of alumina, for example, and its lower end surface is a raw water inflow portion. Raw water such as tap water supplied from the raw water inlet 11 at the lower end of the filter case 2 is removed from the lower surface of the filter body 1 after removing odor components and chromaticity components when passing through the lower activated carbon filling portion 10. It flows into the through hole 9 and is filtered on the inner peripheral surface of the through hole 9. In addition, all the parts other than the through-hole 9 among the upper end surfaces of the filter main body 1 are sealed water outflow prevention portions. Since the upper part of the filter body 1 is sealed by the lid member 3, the raw water cannot flow out to the outside and is dead-end filtered. The purified water which is filtered water passes through the inside of the porous filter body 1 and is discharged from the purified water discharge part S formed on the side surface to the outer peripheral part. In order to facilitate the flow of purified water through the inside of the filter body 1, a plurality of portions with no through holes 9 are formed in the filter body 1 with a predetermined width as shown in FIG. Yes.

  As shown in FIG. 4, the lid member 3 is preferably a dome shape in which gas easily collects in the central portion, and a gas selective permeable membrane 4 is provided in the central portion. The gas permselective membrane 4 is welded to the back surface of the disk 6 having a plurality of holes, and the rib 8 protruding from the back surface of the outer lid 7 screwed to the upper end of the filter case 2 is used to form the lid member 3. It is pressed against the top surface. The lid member 3 is disposed so as to cover the entire upper end surface Z2 of the filter body 1. The type of the gas selective permeable membrane 4 is not particularly limited as long as it can effectively permeate only gas (air) for a long period of time without allowing water to pass therethrough. For example, the gas selective permeable membrane 4 is composed of a membrane having a pore diameter of 5 to 20 nm. What was done can be mentioned as a suitable example. As a specific example of such a membrane having nano-sized pores, for example, trade name: Monotran film manufactured by NAC Co., Ltd. can be mentioned. This is made of polypropylene (PP) or polyethylene terephthalate (PET), and a communication hole having a pore diameter of 5 to 20 nm is formed on a film having a thickness of 25 to 200 μm. With this configuration, it is possible to prevent gas from accumulating inside the filter cartridge, improve water drainage, and prevent a reduction in filtration area.

  The filter main body 1 as described above is fitted inside the filter case 2 with the lower end periphery and the upper end periphery held by the ring-shaped packing, and is pressed downward by the outer lid 7 and the lid member 3. . The lower ring-shaped packing has a normal shape, but a packing-shaped holding portion that makes line contact or point contact with the filter case is provided on the outer peripheral surface of the upper ring-shaped packing 5 at a predetermined pitch in the circumferential direction. . As shown in FIG. 6, the packing shape holding portion 5 a preferably has a horizontal cross-sectional shape that makes line contact or point contact with the inner peripheral surface of the filter case 2. In addition, as shown in FIG. 8, the vertical cross-sectional shape of the packing shape holding portion 5a is any one of a square shape (FIG. 8A), a triangle shape (FIG. 8B), a semicircular shape (FIG. 8C), etc. The shape may also be By making the shape of the packing shape holding portion into such a horizontal cross-sectional shape, the tip of the packing shape holding portion 5a is deformed compared to the case where the horizontal cross-sectional shape is a surface contact shape (for example, a rectangular cross section). It becomes easy to carry out, and the pushing operation | work to the clearance gap between the filter main body 1 and the filter case 2 can be performed easily. In addition, the gap W between the ring-shaped packing that holds the periphery of the upper end of the filter body and the filter case is about 0.5 to 1.5 mm in the case of a domestic water purifier.

  It is preferable that 10 to 60 packing-shaped holding portions 5 a are uniformly arranged on the outer peripheral surface of the ring-shaped packing 5. If the number is less than 10, the interval between them becomes large and the end of the ring-shaped packing is easily turned up by the water flow. Conversely, if the number exceeds 60, the cross-sectional area of the purified water is insufficient and the purified water flows. This is because it becomes difficult.

  In Table 1 below, when twelve packing-shaped holding portions 5a are provided at a pitch of 24 mm on the outer periphery of a filter housed in a filter case having an inner diameter of 94.5 mm (Example 1), the outer periphery of the filter is spaced at a pitch of 12 mm. When 24 packing shape holding parts 5a are provided (Example 2), when 36 packing shape holding parts 5a are provided on the outer periphery of the filter at an 8 mm pitch (Example 3), and packing shape holding parts 5a The results of conducting a water flow test under a water pressure of 0.5 to 5 MPa are shown for the case where no water is provided (Comparative Example 1). The gap W between the ring-shaped packing 5 that holds the peripheral edge of the upper end of the filter body 1 and the filter case 2 was all 1 mm.

  As shown in Table 1, when the line contact is not provided (Comparative Example 1), the end of the ring-shaped packing is at the stage where the water pressure of the purified water that has flowed out from the side surface S side rises to 3.0 MPa or more. The phenomenon that the water flowed up and blocked the flow path of the purified water that flowed out from the side surface portion S side, and no water flow occurred. On the other hand, according to the present invention, when the line contact is provided at an interval that makes the outer peripheral portion of the packing ring equally 12 or more (Examples 1 to 3), the water pressure of the purified water flowing out from the side surface portion S side is reduced. Even when the pressure rose to 3.0 MPa or more, the flow path blockage was prevented. In particular, when line contact is provided at intervals that equally divide the outer periphery of the packing ring into 36 parts (Example 3), even if the pressure of the purified water flowing out from the side surface S side is 5.0 MPa, the ring shape Since the end portion of the packing is not turned up and the packing shape is completely maintained, high water treatment capacity can be stably realized.

  In addition, although the operation | work which fits the ring-shaped packing 5 in the clearance gap between the filter main body 1 and the filter case 2 is performed by hand, in this invention, since the packing shape holding | maintenance part has been arrange | positioned on the outer periphery of the ring-shaped packing 5, surface contact is carried out. As compared with the case, the fitting operation becomes easier, and the working efficiency can be improved. Table 2 below shows a comparison of fitting work time by the same operator for each of the case where the shape of the packing shape holding portion 5a is a semicircular shape in line contact with the filter case 2 and the case where the shape is a square shape. The results are shown. The gap W between the ring-shaped packing 5 that holds the peripheral edge of the upper end of the filter body 1 and the filter case 2 was all 1 mm.

  As described above, according to the water purifier filter cartridge of the present invention, the problem of the flow path blockage can be obtained without using the means of widening the gap W between the ring-shaped packing that holds the periphery of the upper end of the filter body and the filter case. Can be resolved. Further, by incorporating the gas selective permeable membrane, the drainage of the purified water is improved, and the reduction of the purification amount accompanying the reduction of the filter effective area can be prevented. As a result, the purified water flow rate can be increased without changing the size of the filter cartridge.

It is vertical section explanatory drawing of the conventional ceramic filter cartridge for water purifiers. It is vertical section explanatory drawing of the conventional ceramic filter cartridge for water purifiers. It is vertical section explanatory drawing of the conventional ceramic filter cartridge for water purifiers. It is a whole block diagram of the ceramic filter cartridge for water purifiers in this embodiment. It is vertical section explanatory drawing of the ceramic filter cartridge for water purifiers of this invention. It is a BB direction arrow sectional view of Drawing 4. It is structure explanatory drawing of a filter main body. It is explanatory drawing of the vertical cross-sectional shape of a packing shape holding | maintenance part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter main body 2 Filter case 3 Cover member 4 Gas selective permeable membrane 5 Ring-shaped packing 5a Packing shape holding | maintenance part 6 Disc 7 Outer lid 8 Rib 9 Through-hole 10 Activated carbon filling part 11 Raw water inlet

Claims (4)

In the axial direction of the cylindrical porous ceramic body, a large number of through holes having an inner peripheral surface as a filtration surface are formed, the lower end surface of the porous ceramic body is a raw water inflow portion, and the upper end surface is a water outflow prevention portion, A water purifier filter cartridge comprising a filter main body formed with a purified water discharge portion on a side surface, and a filter case for housing the filter main body,
The filter body is fitted inside the filter case with the lower edge and the upper edge held by the ring packing,
A water purifier filter cartridge, characterized in that packing shape holding portions that are in line contact or point contact with the filter case are provided on the outer peripheral surface of the upper ring packing so as to protrude at a predetermined pitch in the circumferential direction.   2. The water purifier filter cartridge according to claim 1, wherein the packing shape holding portion has an arcuate or triangular horizontal section in line contact with the filter case.   2. The water purifier filter cartridge according to claim 1, wherein a lid member having a gas permselective membrane is disposed in close contact with an upper portion of the filter body.   The water purifier filter cartridge according to claim 3, wherein the lid member is a dome shape, and a gas selective permeable membrane is provided at a central portion thereof.

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