JPH0118764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter element, and more particularly to a filter element for a capsule filter that has an increased filtration area and improved pressure resistance.

For example, capsule-type filters have conventionally been employed to remove impurities from molten polymers to produce fibers and the like. As shown in FIG. 1, this capsule type filter has a cylindrical housing 6 closed by an upper lid 2 and a lower lid 4, and a polymer introduction tube 8 disposed in the center thereof. A large number of filter elements 12 are stacked around the periphery. In this case, the filter element 12 itself has punched metals 16, 16 disposed on the upper and lower surfaces of the stainless steel reinforcing wire mesh 14, and the punched metals 16, 1
6 and filter media 18, 18 made of sintered bodies are laminated (see FIG. 2). Note that a large number of holes 20 are formed in the punching metals 16, 16. Therefore, under such a structure, the molten polymer containing impurities is transferred to the tube body 8.
It is introduced into the interior from below and discharged into the housing 6 from its upper end via the guide member 10. The polymer, which is introduced under a predetermined pressure and has high viscosity, passes through the filter medium 18, the holes 20 of the punching metal 16, the reinforcing wire mesh 14, and the holes 20 of the punching metal 16, which constitute the filter element 12.
- Passing through the filter medium 18, impurities are mainly removed by the filter medium 18, and finally discharged to the outside from the polymer outlet 22 formed at the lower end of the housing 6.

However, in the above configuration, the reinforcing wire mesh 14 cannot be extended to the circumferential end of the disk-shaped filter element 12 because the peripheral edge of the filter element 12 needs to be welded. That is, the filter medium 18 and the punched metal 16 are forced to curve in the thickness direction at their peripheral edges and terminate, and as a result, during such curving process, or after curving process and productization, inside the filter. When a highly viscous polymer is introduced into the container under pressure, there are drawbacks such as cracks occurring in the curved shoulder. Furthermore, the holes 20 of the punching metal 16 are not formed in the curved peripheral edge of the filter element 12, and therefore no filtration action is achieved, resulting in problems such as a small filtration area. .

Therefore, as a result of intensive research and repeated trial production, the inventor of the present invention interposed a ring member made of the same sintered metal at the peripheral edge of the punching metal constituting the filter element, and connected the ring member and the punching metal. It has been found that if the filter element is welded together with the filter material, a filter element that is easy to process and has high pressure resistance can be obtained, and the above-mentioned disadvantages can be eliminated. Furthermore, it has been found that since the ring member is composed of a sintered member, the filtration action is carried out to the peripheral edge of the filter element, and therefore the filtration area is also significantly increased.

Therefore, an object of the present invention is to provide a filter element that is easy to process, has high pressure resistance, and can increase the filtration area, thereby improving the filtration efficiency.

In order to achieve the above object, the present invention provides the first
A filter element comprising a filter medium and a second filter medium, and an intervening member is provided between the first filter medium and the second filter medium to separate these filter mediums at a predetermined interval, the first filter medium and the second filter medium A first member and a second member made of a sintered body and having through holes for reinforcement are disposed between the two filter media, and an intervening member of a predetermined thickness made of a sintered body is placed between the two filter media. It is characterized by being provided in direct or indirect contact with the filter medium.

Next, preferred embodiments of the filter element according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 3, reference numeral 30 indicates a reinforcing wire mesh as a first perforated member stretched vertically and horizontally and alternately, and a plurality of holes 32 are arranged in the upper and lower surfaces of this wire mesh 30. Punching metals 34, 34 are provided as second through-hole members. The wire mesh 30 and the punched metals 34, 34 are both circular in shape, and the diameter of the wire mesh 30 is selected to be smaller than the diameter of the punched metals 34, 34. Therefore, a ring body 38 having a rounded peripheral edge is fitted into a space 36 defined by the punched metals 34, 34 extending radially outward from the wire mesh 30.
Next, a plate-shaped filter medium 40 made of a sintered body is laminated on the outer surface of each of the punched metals 34, 34. In this case, it is preferable that the filter medium 40 is made of a sintered body based on stainless steel powder, and that the punching metals 34, 34 and the wire mesh 30 are both made of the same stainless steel material. Filter media 40, 40 and punching metals 34, 3 configured in this way
4 and the peripheral end portions of the ring body 38, that is, the portions indicated by broken lines, are welded together. In this case, the ring body 38 may be composed of a stainless steel plate made of the same material as the punching metal 34;
If it is made of a sintered body of the same quality as the sintered body, it is more effective in that it can be more solidly integrated during welding, and the filtration area can be expanded. In addition, a locking hole 42 is defined in the center of the wire mesh 30, the punching metals 34, 34, and the filter media 40, 40.
Holding members 44, 44 each having a U-shaped cross section are fitted into the inner peripheral edges defining the holes 0 and 40, respectively.

The filter element according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

When the filter element 54 according to the present invention is installed in the casing 52 of the capsule filter 50, which has a configuration substantially similar to that of the prior art, one lid member 56 that closes the casing 52 is opened; A large number of filter elements 54 are stacked and attached to the tube body 58 through the holes 42 thereof. In this case, if the diameter of the filter element 54 is set to be approximately the same as the inner diameter of the space of the housing 52, the peripheral edge of the filter element 54 will come into contact with the inner wall of the housing 52. Therefore, the molten polymer is prevented from being led out of the housing 52 without passing through the filter element 54. When stacking the filter elements 54, it is preferable to interpose a ring-shaped spacer 59 in the tube body 58 so that the filter elements 54 can be spaced apart at equal intervals. Finally, the housing 52 is closed again with the lid member 56,
Screw in the bolts 60, 60 and tighten.

Therefore, the highly viscous molten polymer is introduced into the tube body 58 through the hole 62 formed in the lid member 56 . The polymer that has passed through the tube body 58 is introduced from the top of the tube body 58 into the interior of the housing 52 via the guide member 64 under a predetermined pressure. That is, since the guide member 64 extends close to the inner wall of the housing 52, the highly viscous polymer flows into the filter element 54 and permeates therein. Therefore, the polymer passes through the laminated filter medium 40 - punching metal 34 - wire mesh 30 - punching metal 34 - filter medium 40 in this order, and impurities contained in the polymer are removed during this time. that time,
The impurities contained in the polymer that has reached the peripheral edge of the filter element 54 are removed during the process of passing through the filter medium 40 and the ring body 38 made of a sintered body. Incidentally, even if the highly viscous polymer passes through under a predetermined pressure, the interposition of the ring body 38 ensures sufficient strength of the peripheral edge of the filter element 54, so accidents such as breakage will not occur. Furthermore, since the ring body 38 is made of a sintered body, the filtration area can be expanded, and impurities can of course be effectively removed.

Of course, the polymer from which impurities have been removed is discharged to the outside through the outlet 66 formed in the lid member 56.

In the present invention, as described above, the filter element is interposed with a ring member made of a sintered body, so the pressure resistance is extremely high, and since the ring member is arranged at the peripheral edge of the filter element, the filtration area is reduced. It can be further expanded. moreover,
Compared to the conventional technology, remarkable effects such as easier manufacturing process can be obtained.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of a capsule-type filter according to the prior art, FIG. 2 is a longitudinal cross-sectional view of a filter element incorporated in the capsule-type filter of FIG. 1, and FIG. 3 is a filter element according to the present invention. FIG. 4 is an explanatory cross-sectional view of a capsule filter equipped with a filter element according to the present invention. 2... Upper lid, 4... Lower lid, 6... Housing, 8...
Pipe body, 10... Guide member, 12... Filter element, 14... Wire mesh, 16... Punching metal, 30... Wire mesh, 32... Hole, 34... Punching metal, 36... Space, 38... ... Ring body, 40 ... Filter medium, 42 ... Hole, 44 ... Holding member, 50 ... Filter, 52 ... Housing, 54 ...
Filter element, 56... Lid member, 58...
Pipe body, 59... Spacer, 60... Bolt, 62
... hole, 64 ... guide member, 66 ... outlet.

Claims (1)

[Scope of Claims] 1. A first filter medium and a second filter medium;
In a filter element in which an intervening member is provided between a filter medium and a second filter medium for separating these filter mediums at a predetermined interval, the first filter medium and the second filter medium are made of sintered bodies, and a reinforcing member is provided between the two filter mediums. A first member and a second member each having a through-hole are provided, and an intervening member of a predetermined thickness made of a sintered body is provided in direct or indirect contact with the two filter media. Characteristic filter element. 2. The filter element according to claim 1, wherein the first through-hole member is made of wire mesh, and the second through-hole member is made of punched metal.