TWI775966B - filter device - Google Patents

Abstract

The filter device of the present invention is a filter device 1 including a filter case 10 having a filter head 13 and a cup cover 11 that can be attached to and detached from the filter head 13 , and a filter case 10 that is accommodated and arranged in the filter case 10 . A filter cartridge 20 having a filter portion inside, and the filter device is formed by allowing the liquid flowing in from the inflow port 14 of the filter head 13 to pass through the filter portion of the filter cartridge 20 and to flow out from the outflow port 15 of the filter head 13. The liquid is filtered; and the cup cover 11 of the filter housing 10 includes a cylindrical side portion 11a, an opening portion 11b located on one end side of the side portion 11a and mounted with the filter head 13, and a portion of the side portion 11a. The other end side is constituted by the closed bottom 11c, and the side 11a has a tapered portion 16 that becomes thinner and thinner from the opening 11b side toward the bottom 11c side, and is formed in the middle of the axial direction of the tapered portion 16. There is a joining surface 18 which protrudes over the entire circumference from the outer surface of the tapered portion 16 to the outer peripheral side and/or from the inner surface of the tapered portion 16 to the inner peripheral side toward the side of the above-mentioned opening portion 11b, so that the transverse area increases.

Description

filter device

The present invention relates to a filter device having a filter housing and an exchangeable filter cartridge accommodated and disposed in the filter housing to allow liquid to pass through the filter portion of the filter cartridge for filtering, and particularly proposes that the filter housing can be Technology corresponding to various sizes of filter cartridges.

Such a filter device usually includes the following: a filter housing, which has a filter head provided with an inflow port and an outflow port through which the liquid flows in or out, and a bottomed cylindrical filter head that is detachably connected to the filter head. A cup cover; and a filter cartridge, which is installed on the filter head in the filter housing for storage and configuration; for example, in the filtration process for filtering pure water, chemical liquid, etc. used in the manufacture of semiconductors, electronic parts, and other various used in.

In addition, here, if the filter device is used for a certain period of time, since the pollutants contained in the filtered sewage adhere to the filter part of the filter cartridge, the capturing performance of the pollutants is lowered, so the filter cartridge It is usually exchanged with a new cartridge after an established period of use. As a technique related to such a filter device, there are techniques described in Patent Documents 1 to 3, and the like. [Prior Art Document] [Patent Document]

[Patent Document 1] Japanese Patent No. 4664596 [Patent Document 2] Japanese Patent Laid-Open No. 2016-2522 [Patent Document 3] International Publication No. 2016/174777

[Problems to be Solved by Invention]

However, there are various sizes of filter cartridges with different lengths in the axial direction of the housing. It is assumed that a filter cartridge with a sufficiently short length in the axial direction of the housing relative to the inner space of the filter housing is placed in the filter housing. In the case of using it inside, from the viewpoint of space constraints for arranging the filter device in the above-mentioned filtration process, there is a case where the length of the casing in the axial direction of the cup cover is shortened after the filter casing is manufactured. The subsequent shortening of the cup length as described above can be performed by the following operations: cutting and removing the middle section of the predetermined length in the axial direction of the shell of the cup, and cutting the bottom side area of the cup after cutting. The segment and the opening portion side segment to which the filter head is mounted are joined to each other by their cut end faces.

However, in the filter case in which the cup cover has a tapered portion that becomes thinner and thinner from the opening side toward the bottom side, for example, for reasons of releasability by injection molding, the cup cover after cutting as described above is The cut end surfaces of the bottom-side segment and the opening-portion-side segment are displaced from each other in the radial direction due to the drop-off of the tapered intermediate segment. In this case, the area required for joining the end surfaces of the bottom side section and the opening side section of the cup cannot be sufficiently secured, and there is a problem that they cannot be firmly joined.

The subject of the present invention is to solve the above-mentioned problems of the prior art, and its object is to provide a filter device that can respond to filter cartridges of various sizes and effectively change the length of the cup cover of the filter housing. [means to solve the problem]

The filter device of the present invention includes: a filter case having a filter head and a cup cover that can be attached to and detached from the filter head; The liquid flowing in from the inflow port of the filter head passes through the filter portion of the filter cartridge and flows out from the outflow port of the filter head to filter the liquid; and the cup cover of the filter housing includes a cylindrical side portion , is located at one end side of the side portion and is provided with an opening portion to which the filter head is mounted, and a bottom portion that seals the other end side of the side portion, and the side portion has a tapering from the opening portion side toward the bottom side. The tapered portion of the tapered portion is formed in the middle of the axial direction of the tapered portion with a surface for joining, which faces the opening portion side, from the outer surface of the tapered portion to the outer peripheral side and/or from the inner surface of the tapered portion. On the peripheral side, it protrudes over the entire circumference, increasing the cross-sectional area.

Here, it is preferable that the cup cover has an outer flange protruding annularly from the outer surface of the tapered portion to the outer peripheral side in the middle of the axial direction of the tapered portion, and the outer flange is directed toward the opening portion. The surface of the side is set as the above-mentioned surface for joining protruding from the outer surface of the tapered portion to the outer peripheral side. In this case, it is preferable to set the diameter of the outer edge of the outer flange most protruding from the outer peripheral side to be smaller than the maximum outer diameter of the tapered portion.

In addition, it is preferable that the cup cover has an inner step in the middle of the axial direction of the tapered portion, the inner step is provided with a protruding corner portion over the entire circumference of the inner surface of the tapered portion, and the direction of the inner step is oriented The surface on the side of the opening portion is set as the surface for joining protruding from the inner surface of the tapered portion toward the inner peripheral side.

In the filter device of the present invention, the cup has an opening-side section divided by the position of the joining surface along the axial direction of the cup, and a bottom-side section including the joining surface, There is a case where the opening portion side segment and the bottom side segment are joined to each other by welding or welding on the joining surface. In this filter apparatus, it is preferable that the whole end surface of the said bottom-side segment side of an opening part side segment is fixed to the end surface of the bottom-side segment containing the said surface for joining.

Moreover, in the filter apparatus of this invention, there exists a case where the said cup is integrally formed. [Effect of invention]

According to the filter device of the present invention, the tapered portion of the side portion of the cup cover included in the filter housing is formed with the above-mentioned surface for joining to increase the cross-sectional area in the middle of the axial direction. The tapered portion of the cup whose length should be shortened is cut and removed from the middle section of the cup that is closer to the opening side than the joining surface, and the remainder of the cup after removal of the middle section is the bottom side section and the opening. Each cut end face of the side section is offset toward the inner and outer peripheries due to the tapered shape. Even so, the joint surface on the bottom side section side and the end face of the opening side section can be firmly joined by a sufficient area. . Therefore, in the filter device, the length of the cup cover of the filter housing can be effectively changed, and the filter cartridges of various sizes can be matched.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The filter apparatus 1 illustrated by the longitudinal cross-sectional view in FIG. 1 is provided with the filter case 10 formed in the container shape with a cover, and the cylindrical filter cartridge 20 accommodated and arrange|positioned in the filter case 10.

Here, in the illustrated embodiment, the filter case 10 is constituted by including the cup cover 11 , one end side in the axial direction of the case of the cylindrical side portion 11 a of the cylinder and the other cylindrical shape (in FIG. 1 ). The left side) is opened by the opening portion 11b, and the other end side (the right side in FIG. 1 ) of the side portion 11a in the axial direction of the casing is sealed by the bottom portion 11c; It is liquid-tightly connected to the opening 11b on the one end side in the axial direction of the casing of the cup cover 11 in a detachable manner.

Among them, the filter head 13 is, for example, in the cross-section shown in the figure, and has a cylindrical inflow port 14 and an outflow port 15 extending opposite to each other across the casing axis AD. The inflow port 14 and the outflow port 15 15 can respectively flow liquid into the filter housing 10 and liquid can flow out of the filter housing 10 . In addition, the casing axis direction referred to here means the extending direction of the casing axis AD passing through the center position of the cross section of the bottomed cylindrical cup 11 .

In addition, here, in the embodiment shown in the figure, the filter cartridge 20 substantially has a cylindrical body portion 20a, an opening portion 20b provided on one end side of the body portion 20a in the axial direction of the casing, and a The bottom portion 20c on the other end side of the main body portion 20a on the same side as the bottom portion 11c of the cup cover 11. In addition, here, most of the filter cartridge 20 is located inside the filter housing 10 in the cup cover 11, and at the end on the side of the opening 20b protruding from the opening 11b of the cup cover 11 to the filter head 13 side , connected with the filter head 13 .

In addition, the filter cartridge 20 is provided with a filter arrangement space 21 in the main body portion 20a, and in the filter arrangement space 21, an unillustrated filter portion through which the liquid flowing into the filter case 10 passes is arranged. . In addition, a plurality of openings through which liquid can pass are provided in the cylindrical portion constituting the main body portion 20a.

Such a filter device 1 is provided to those who filter liquids such as ultrapure water, chemical solutions, etc., which are used in the manufacture of semiconductors, microelectronics, and the like. In order to filter the liquid using the filter device 1, for example, the liquid is made to flow into the filter head 13 from the inflow port 14 of the filter head 13, and from the end of the filter cartridge 20 on the side of the opening 20b to the filter cartridge 20 in the cup cover 11 flow inside. Then, the liquid passes through the main body 20a from the inner side of the filter cartridge 20 to the outer side while removing the contaminants in the liquid in the filter portion of the filter arrangement space 21 inside the liquid. Then, the liquid passes through the inside of the cup cover 11 and the filter head 13 in sequence, and flows out of the filter housing 10 through the outflow port 15 . However, the filtering method using the filtering device 1 is described as an example, and the present invention is not limited to this filtering method.

In addition, the cup cover 11 of the filter housing 10 has a cylindrical side portion 11a, an opening portion 11b located on one end side in the housing axis direction of the side portion 11a, and a side portion 11b as shown in a perspective view in FIG. 2 . The bottom part 11c of the other end side of the casing axial direction of the part 11a may be formed by injection molding, for example, in the case of resin.

In this case, in consideration of demolding from the injection mold after curing in the injection mold, such a bottomed cylindrical cup 11 is understood as shown in FIG. 3, and most of the side portion 11a is In the tapered portion 16, the inner and outer diameters of the tapered portion 16 gradually decrease linearly and become thinner in a longitudinal section from the side of the opening portion 11b toward the side of the bottom portion 11c, for example. In this embodiment, the tapered portion 16 is formed from the attachment flange 17 used when attaching the filter head 13 by the coupling ring 12 to the portion where the inner and outer surfaces on the bottom 11c side become curved surfaces. The taper angle of the taper portion 16 relative to the housing axis AD is measured on the outer surface of the taper portion 16 , and can be set to, for example, 0.5°˜3°. The portion from the surface of the mounting flange 17 toward the bottom portion 11c side to the opening portion 11b in the housing axis direction is not tapered, and is not included in the tapered portion 16 described above. However, although the illustration is omitted, the tapered portion is also included in the vertical cross-section, and the tapered portion becomes thinner and thinner in a curvilinear or other linear shape. Regardless of the shape, at least the outer diameter gradually decreases toward the bottom portion 11c side. can be.

Among them, in this embodiment, in the middle of the casing axis direction of the tapered portion 16 as described above, from the outer surface of the tapered portion 16 to the outer peripheral side and/or from the inner surface of the tapered portion 16 to the inner peripheral side , which protrudes over the entire circumference, and forms a joining surface 18 facing the opening portion 11b side. By forming the joining surface 18, when viewed along a cross-section cut along a plane perpendicular to the housing axis direction and including the joining surface 18, at the forming position of the joining surface 18, The cross-sectional area of the tapered portion 16 is increased.

Taking this embodiment as an example, the advantages of forming the joining surface 18 in the middle of the tapered portion 16 will be described in detail as follows. The previously described filter cartridge 20 also has a short length in the axial direction of the casing according to its use or performance and other conditions. In the case of using the above-mentioned short filter cartridge 20, compared with the cup cover 11 whose length in the axial direction of the casing is too long, the inside of the filter housing 10, especially on the bottom 11c side of the cup cover 11, forms no filter. The excess space of the cartridge 20, on the other hand, may not be sufficient to arrange the cup cover 11 that is too long outside the filter housing 10 depending on the installation location of the filter device 1. In such a situation, after the cup cover 11 is manufactured, the length in the axial direction of the casing of the cup cover 11 must be shortened afterwards.

This can be dealt with by the following method: for example, cutting at the cutting positions CL1 and CL2 of the two parts indicated by the dotted lines in FIG. 3 , and removing the middle section Sm ( That is, the portion sandwiched between the two broken lines of the cutting positions CL1 and CL2, which are located in the middle region of the tapered portion 16 and isolated from each other in the axial direction of the casing), as shown in FIG. 4, the remaining bottom The side segment Sb and the opening part side segment Sa are joined to each other with their cut end surfaces.

Here, in this embodiment, by forming the joining surface 18 which increases the cross-sectional area in the middle of the casing axis direction of the tapered portion 16 of the cup cover 11, the cutting position CL1 of the two parts is . The cutting position CL2 on the side of the bottom 11c in CL2 coincides with the forming position of the bonding surface 18, whereby the main part CA is enlarged as shown in FIG. The cut end face of the bottom-side segment Sb including the joining surface 18 having a large area is joined. Thereby, the joining area of the cut end surfaces of the opening part side segment Sa and the bottom side segment Sb can be ensured, and the cut end surfaces of the same can be firmly joined.

On the other hand, if the cup cover 81 of the filter housing of the filter device of the reference example shown in FIG. 6 is cut at the cutting positions CL1 and CL2 in the same manner to remove the intermediate section Sm, the cone 7 and 8, the cut end face of the bottom side segment Sb is shifted to the inner peripheral side than the cut end face of the opening side segment Sa. And positioning. Furthermore, if the cut end surfaces of the bottom-side segment Sb and the opening-side segment Sa are to be joined to each other, since the joining surface 18 does not exist, as shown in the figure, there is a problem that the cut end surfaces of the same are The joint area between each other becomes small, and a firm joint cannot be realized, or even a part of the cut end faces that can be joined to each other disappears, and the joint cannot be joined.

The joint of the cut end surfaces of the opening portion side segment Sa and the bottom side segment Sb can be performed by welding when it is formed of a resin material, or by welding when it is formed of a metal material. Although other joining methods such as the use of an adhesive may be employed, welding or welding is advantageous from the viewpoints of material cost, workability, and the like. However, depending on the material of the resin such as vinyl chloride and other conditions, there are cases where the bonding becomes favorable.

In order to realize the firm joining of the cut end surfaces as described above, the joining surface 18 needs to be formed over the entire circumference of the tapered portion 16 of the side portion 11a in the circumferential direction. The reason for this is that the cut end surfaces of the bottom-side segment Sb and the opening-portion-side segment Sa can be joined over the entire circumference with a sufficiently large area. In addition, although the engaging surface 18 may have a radial length that varies in the circumferential direction, it is generally a substantially circular annular shape having a fixed radial length throughout the entire circumference. It is also easy to manufacture the cup cover 11 by making the joint surface 18 fixed in the direction.

At the junction of the cut end surfaces, the entire end surface on the bottom side segment Sb side of the opening portion side segment Sa is preferably fixed to the bottom side segment Sb when viewed from both the circumferential direction and the radial direction. Including the end face of the joining surface 18 .

In addition, in the example shown in the figure, the joining surface 18 is formed substantially parallel to a plane orthogonal to the axial direction of the casing, and the outer edge of the joining surface 18 may be set so that the outer edge of the joining surface 18 faces the opening 11b or the bottom 11c. Either side of the side is inclined, and is inclined at 0° to 60° with respect to the plane orthogonal to the axis direction of the casing. If the inclination angle of the joining surface 18 is too large, the cutting end face of the opening portion side segment Sa is joined to the inclined joining surface 18 of the bottom side segment Sb, and there is a possibility that the joining strength of the cutting end faces is slightly lowered. .

In addition, it is preferable that the formation position of the surface 18 for joining in the axial direction of the casing is a position separated by 10 mm or more from the outermost end Eb of the bottom portion 11c to the opening portion 11b side, and a position facing from the end face of the opening portion 11b. The bottom 11c side is separated by more than 20mm. If the joining surface 18 is too close to the end face of the opening 11b, the amount of grip (grip) for holding the opening side segment Sa during welding or welding will be lost, and welding or welding will become difficult. On the other hand, if the bonding surface 18 is too close to the outermost end Eb of the bottom portion 11c, there is a concern that the bottom portion 11c will be deformed by heat during welding and welding. The above-mentioned formation position of the joint surface 18 in the axial direction of the casing is based on the contact point between the joint surface 18 and the outer surface of the tapered portion 16 .

In addition, although the illustration is omitted, a plurality of joining surfaces 18 may be formed at different positions in the axial direction of the housing.

As shown in FIG. 3 , the joining surface 18 may not only protrude from the outer surface of the tapered portion 16 to the outer peripheral side, as shown in FIGS. 4 and 5 , but not only from the outer surface of the tapered portion 16 to the outer peripheral side Protruding and protruding from the inner surface of the tapered portion 16 toward the inner peripheral side. The engaging surface 18 of the cup cover 31 shown in FIGS. 4 and 5 not only has a surface portion that protrudes from the outer surface of the tapered portion 16 to the outer peripheral side, but also has a surface portion that protrudes from the inner surface of the tapered portion 16 to the inner peripheral side. the surface part. Further, although this is an extreme example, the cutting position CL1 on the side of the opening 11b among the cutting positions CL1 and CL2 of the two positions shown in FIG. 3 may be the highest of the tapered portion 16 At the position on the side of the opening 11b (ie, the position of the surface on the side of the bottom 11c of the mounting flange 17), as shown in FIG. In this case, the surface 18 for joining becomes the thing which protrudes only from the inner surface of the tapered part 16 toward the inner peripheral side.

That is, the present invention also includes the filter apparatus 1 of FIG. 10 having the cup cover 31 shown in FIG. 4 and the filter apparatus 1 of FIG. 11 having the cup cover 41 shown in FIG. 9 . 10 and 11 has substantially the same structure as that shown in FIG. 1 except for the above-mentioned cups 31 and 41 and the length of the housing axis direction of the filter cartridge 20 is different. With regard to the cups 31 and 41 shown in FIGS. 4 and 9 , the opening portion side section Sa and the bottom side section Sb including the joining surface 18 are joined to each other by welding, welding or the like, and the cups 31 and 41 are joined to each other by welding or welding. In the axial direction of the casing, it is divided into the opening part side segment Sa and the bottom side segment Sb by the position of the surface 18 for engagement. On the other hand, the cup cover 11 shown in FIG. 3 is integrally formed.

The cup 11 shown in FIG. 3 has an outer flange 18a annularly protruding from the outer surface of the tapered portion 16 to the outer peripheral side in the middle of the casing axis direction of the tapered portion 16. The outer flange The surface facing the opening part 11b side of 18a is set as the surface 18 for engagement which protrudes to the outer peripheral side from the outer surface of a tapered part.

In the cup cover 11 having such an outer flange 18a, it is preferable that the diameter Df of the outer flange 18a protruding most from the outer edge of the outer peripheral side is smaller than the maximum outer diameter Dt of the tapered portion 16. Thereby, when the filter head 13 is mounted on the cup cover 11, the outer flange 18a does not interfere when the connecting ring 12 is moved from the bottom 11c side of the cup cover 11 to the mounting flange 17 on the opening 11b side. This movement of the connection ring 12 facilitates the arrangement of the connection ring 12 . However, if the diameter Df of the outer edge of the outer flange 18a is too small, the joining surface 18 on the outer flange 18a is also reduced, and there is a concern that a firm joining of the cut end faces cannot be achieved. In addition, the maximum outer diameter Dt of the tapered portion 16 is at the position of the boundary of the portion where the outer diameter of the tapered portion 16 is fixed regardless of the mounting flange 17 on the side closest to the opening portion 11b (that is, the tapered portion 16 and the position of the boundary of the base of the mounting flange 17).

In addition, the outer flange 18a can also be used as a separate member from the tapered portion 16 of the cup cover 11, and is subsequently fixed to the tapered portion 16 of the cup cover 11 after manufacturing by welding or welding. In this case, the subsequent mounting of the outer flange 18a may be performed at any time before or after cutting the cup 11 at the position where the joining surface 18 is formed. However, since the installation of the outer flange 18a after the manufacture of the cup cover 11 increases the man-hours, the outer flange 18a is preferably formed integrally with the tapered portion 16 of the cup cover 11 . When the cup cover 11 is manufactured by injection molding, it is preferable that the outer flange 18a is also integrally formed at this time.

On the other hand, the cup 41 shown in FIG. 9 has an inner step 18c in the middle of the casing axis direction of the tapered portion 16, and has a protruding corner portion 18b over the entire circumference of the inner surface of the tapered portion 16 , the surface of the inner step 18c facing the opening portion 11b side is set as the joint surface 18 protruding from the inner surface of the tapered portion 16 to the inner peripheral side. The size and shape of the inner step 18c can be appropriately set in such a way that the cut end faces can be firmly joined to each other without hindering the arrangement of the filter cartridge 20 inside the cup cover 41 and the smooth circulation of the liquid in the cup cover 41 .

The cup 31 shown in FIG. 4 has both the above-mentioned outer flange 18a and the inner step 18c at the same position in the axial direction of the casing, whereby the engaging surface 18 of the cup 31 extends from the tapered portion 16 The outer surface protrudes to both sides of the outer peripheral side and from the inner surface to the inner peripheral side.

In order to assemble the filter device 1 of the above-described embodiment, the end of the filter cartridge 20 on the side of the opening 20b is fixed to a predetermined position inside the filter head 13 with screws or the like, and then the filter cartridge is 20 Insert the cup cover 11, 31 or 41, cover the opening 11b of the cup cover 11, 31 or 41 with the filter head 13, and pass from the bottom 11c side of the cup cover 11, 31 or 41 toward the opening 11b The connecting ring 12 is arranged on the inner surface of the connecting ring 12 and the filter head 17 in the state where the mounting flange 17 of the cup cover 11, 31 or 41 is sandwiched between the inward flange of the connecting ring 12 and the filter head 13, respectively. The screws on the outer surface of the head 13 are screwed together. At these connection parts, O-rings and other sealing members for preventing liquid leakage may be provided as required.

In addition, at the bottoms 11c of the cups 11, 31, and 41, a discharge port 11d for discharging the liquid to the outside of the apparatus when the liquid is discharged from the filter device 1 can be provided, and in addition, the liquid can be discharged from the discharge port 11d when the liquid is discharged. The ventilation port 13a, which can allow the air inside and outside the filter device 1 to circulate, is arranged on the top of the filter head 13. In addition, in the normal use of the filter apparatus 1, the discharge port 11d and the ventilation port 13a are sealed by attaching a cap not shown.

Among the components of the filter device 1, the filter head 13, the cup cover 11, 31, 41, the connecting ring 12, and the material of the main body portion 20a of the filter cartridge 20 are only required to be resistant to the liquid to be filtered. : Plastic (preferably polyethylene including ultra-high molecular weight polyethylene, polypropylene, PTFE (polytetrafluoroethylene, polytetrafluoroethylene), PFA (polyfluoroalkoxy, soluble polytetrafluoroethylene), PVDF (polyvinylidene fluoride, polyvinylidene fluoride) ) and other aromatic polyether ketones such as fluorine resins, polycarbonates, polysilicon, polyether silt, polyvinyl chloride, PEEK (polyether ether ketone, polyether ether ketone), PAI (polyamide-imide, polyamide imine) and other polyamides, polyphenylene sulfide, liquid crystal polymers, cycloolefin polymers (COP), etc.). As for the filter head 13 or the cup cover 11, 31, 41, in addition to the above-mentioned materials, glass or metals such as stainless steel, aluminum, copper, nickel, chromium, titanium, or alloys or mixtures thereof, etc. can be selected according to the application. Choose the best.

In addition, the material of the filter portion of the filter cartridge 20 can be made of paper, cellulose-based materials, glass fibers and fabrics, metals such as stainless steel, nickel, chromium and their alloys, as well as mixtures, ceramics, and plastics. Among them, in the case of plastic, it is preferable to use polyethylene such as ultra-high molecular weight polyethylene, polypropylene, PVDF, PTFE, PFA and other fluororesins, PCV (polychlorovinyl, polyvinyl chloride), nylon, polyvinyl chloride, etc. Thermoplastic materials such as amide, polyamide, polyimide, polycarbonate, PET (polyethylene terephthalate, polyethylene terephthalate) can use various materials that can be used in ordinary filtration.

1‧‧‧Filter device 10‧‧‧Filter housing 11, 31, 41‧‧‧Cup cover 11a‧‧‧Side part 11b‧‧‧Opening part 11c‧‧‧Bottom 11d‧‧‧Drain port 12‧‧ ‧Connecting ring 13‧‧‧Filter head 13a‧‧‧Vent hole 14‧‧‧Inlet 15‧‧‧Outlet 16‧‧‧Tapered portion 17‧‧‧Installation flange 18‧‧‧Joining surface 18a‧ ‧‧Outer flange 18b‧‧‧Corner 18c‧‧‧Inner step 20‧‧‧Filter cartridge 20a‧‧‧Main body 20b‧‧‧Opening 20c‧‧‧Bottom 21‧‧‧Filter arrangement space CL1, CL2‧‧‧Cutting position Sm‧‧‧Middle segment Sa‧‧‧Opening side segment Sb‧‧‧Bottom side segment Df‧‧diameter of outer edge of outer flange Dt‧‧‧Tapered The maximum outer diameter of the part Eb‧‧‧the outermost end AD‧‧‧ of the bottom 11c of the casing axis CA‧‧‧main part

FIG. 1 is a longitudinal sectional view of a filter device according to an embodiment of the present invention, taken along the axial direction of the casing. FIG. 2 is a perspective view showing a cup cover included in the filter housing of the filter device of FIG. 1 . FIG. 3 is a longitudinal sectional view of the cup cover of FIG. 2 . Fig. 4 is a longitudinal sectional view of the cup shown in Fig. 2 by cutting and removing the middle section, and joining the bottom side section and the opening side section. FIG. 5 is an enlarged partial cross-sectional view showing the main part of the cup of FIG. 4 . FIG. 6 is a longitudinal sectional view showing a cup cover of a reference example. Fig. 7 is a longitudinal sectional view of the cup shown in Fig. 6, which is obtained by cutting and removing the middle section, and joining the bottom side section and the opening side section. FIG. 8 is a partial cross-sectional view showing an enlarged main part of the cup of FIG. 7 . Fig. 9 is a longitudinal sectional view of the cup shown in Fig. 2, which is obtained by cutting and removing the middle section, and joining the bottom side section and the opening side section. Fig. 10 is a longitudinal sectional view showing a filter device having another embodiment of the cup shown in Fig. 4 . Fig. 11 is a longitudinal cross-sectional view showing a filter device of another embodiment having the cup cover of Fig. 9 .

1‧‧‧Filtering device

10‧‧‧Filter housing

11‧‧‧Cup Cover

11a‧‧‧Side

11b‧‧‧Opening

11c‧‧‧Bottom

11d‧‧‧Drain port

12‧‧‧Connecting Ring

13‧‧‧Filter

13a‧‧‧vent

14‧‧‧Inlet

15‧‧‧Outlet

18‧‧‧Joint surface

18a‧‧‧Outside flange

20‧‧‧Filter Cartridge

20a‧‧‧Main body

20b‧‧‧Opening

20c‧‧‧Bottom

21‧‧‧Filter configuration space

Claims (7)

A filter device comprising: a filter housing having a filter head and a cup cover that can be attached to and detached from the filter head, and a filter cartridge accommodated and arranged in the filter housing and having a filter portion, The liquid flowing in from the inflow port of the filter head passes through the filter part of the filter cartridge and flows out from the outflow port of the filter head to filter the liquid; the cup cover of the filter housing includes a cylindrical side part, The opening is located on one end side of the side part and has a filter head mounted thereon, and the bottom part seals the other end side of the side part, and the side part has a tapered shape from the opening part side toward the bottom part side. the tapered portion; and a joining surface is formed in the middle of the axial direction of the tapered portion, which faces the side of the opening, from the outer surface of the tapered portion to the outer peripheral side and/or from the inner surface of the tapered portion inward. On the peripheral side, it protrudes over the entire circumference, increasing the cross-sectional area. The filter device according to claim 1, wherein the cup cover is located in the middle of the axial direction of the tapered portion, and has an outer flange protruding annularly from the outer surface of the tapered portion to the outer peripheral side, and the outer flange is attached to the outer flange. The surface facing the side of the opening portion is the surface for joining protruding from the outer surface of the tapered portion to the outer peripheral side. The filter device according to claim 2, wherein the diameter of the outer edge of the outer flange most protruding from the outer peripheral side is set to be smaller than the maximum outer diameter of the tapered portion. The filter device according to any one of claims 1 to 3, wherein the cup cover has an inner step in the middle of the axial direction of the tapered portion, and the inner step extends over the entire circumference of the inner surface of the tapered portion and has In the protruding corner portion, the surface of the inner step facing the opening portion side is set as the joining surface protruding from the inner surface of the tapered portion toward the inner peripheral side. The filter device according to any one of claims 1 to 3, wherein the cup cover has: opening-portion side sections divided from each other by the position of the engagement surface in the axial direction of the cup cover; The bottom-side section of the surface for joining, and the opening-portion-side section and the bottom-side section are tied to the above-mentioned joining surface and joined by welding or welding. The filter device according to claim 5, wherein the entirety of the end surface on the side of the bottom side segment of the opening portion side segment is fixed to the end surface of the bottom side segment including the surface for joining. The filter device according to claim 2 or 3, wherein the cup cover is integrally formed.

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