JP3371366B2 - Cell type filter cartridge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell-type filter cartridge in which the back pressure strength of a filter cell is kept strong and the filter life is extended.

[0002]

2. Description of the Related Art Cell-type filter cartridges, in which a disk-shaped filter material made of filter paper or a calcined filter material is sealed with a ring and laminated in multiple stages, are widely used in the food industry, chemical industry, pharmaceutical / pharmaceutical industry, etc. It is used.

In the above cell type filter cartridge, a spacer (circuit material) is sandwiched between filter paper and a calcined filter material, and the outer peripheral portion is injection-molded or friction-molded to form a ring-sealed filter cell. It is a cartridge type structure in which multiple layers are stacked using a sealing material.

Conventionally, since the integrity test method for this depth type filter cartridge has not been known, there has been a problem that an accurate replacement standard cannot be grasped.

Therefore, the present applicants developed a completeness test method for a depth type filter cartridge and applied for a patent first.

By applying the above-described integrity test method, the cell type filter cartridge sometimes fails. As a result of diligent research into this cause, when this filter cartridge is used for filtering liquid or gas containing liquid, the strength of the paper decreases when the filter paper gets wet with liquid, and a sudden pressure change due to a water hammer etc. that occurs in the filtration process. It was confirmed that the back pressure caused by swells the filter paper constituting the filter cell by the internal pressure, and the filter material bursts.

[0007]

When the filter medium bursts as described above, not only cannot proper filtration be performed, but also an accurate increase in differential pressure due to poor filtration and purification or clogging cannot be confirmed. There is a problem that it is difficult to understand the replacement guideline.

The cause of the back pressure is the opening and closing of water hammers and valves installed before and after the filtration housing due to the start and stop of the pump at the start and end of filtration, but these are inevitable.

The present invention has been made in view of the above circumstances, and is a cell type in which the filter material is not ruptured or is difficult to rupture due to the back pressure caused by a rapid pressure change caused by a water hammer or the like generated in the filtration step. It is intended to provide a filter cartridge.

[0010]

Means for Solving the Problems The structure of the present invention in accordance with the above object is a cell type filter cartridge in which filter cells made of filter paper or calcined filter material are laminated in multiple stages, and a plate for sandwiching the filter cells at the upper end and the lower end.
, A large number of ribs are radially formed on the outer circumference of the ring-shaped plate.
It is characterized in that it is constituted by the above-mentioned composition to enhance the back pressure strength of the filter medium.

In summary, the present invention has found that the filter cell filter medium expands and bursts by back pressure,
The gist of the invention is to improve the reverse pressure durability and increase the burst strength by suppressing such expansion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described.

As the cell type filter cartridge used in the present invention, as shown in FIG. 1, a disk-shaped filter medium outer peripheral portion sandwiching a spacer (circuit material) for securing a circuit through which a fluid flows by a filter medium is sealed with a ring. The stacked filter cells 1 are stacked in multiple stages, and the filter cells 1 are fitted to a supporting tube via a ring-shaped sealing material on the inner peripheral portion. Plates 2 and 2 are attached to both ends of the supporting tube. It is preferable to use the cell type filter cartridge 3 in which the upper and lower filter cells 1 are sandwiched.

As the filter material, it is preferable to use a filter paper, preferably a calcined filter material containing diatomaceous earth and pulp. The thickness of the filter material used in the present invention is preferably 1 to 5 mm. If it is too thin, the strength of the filter material cannot be maintained, and if it is too thick, the shape of the disk cannot be maintained during injection molding of the outer peripheral portion. The disk used in the present invention has an outer diameter of 100 to 600 mm and an inner diameter of 2
It is preferably 0 to 100 mm.

FIG. 2 shows an embodiment of the plate 2 of the present invention, in which a large number (16) of ribs 4 are provided on the outer periphery of the plate.
The following shows an example of radially arranging. By connecting the ribs 4 in this way, it is possible to suppress the bulging of the disk-shaped filter medium due to the back pressure and to increase the back pressure strength of the filter medium.

The number of ribs 4 is 8 to 16, preferably 12 to 16. If the amount is too small, the effect of preventing the swelling of the filtering material becomes insufficient, and if the amount is too large, the filtering function is hindered.

It is preferable that the tips of the ribs 4 have a radius that reaches the center of the filter medium. If the length is equal to or less than the center of the filter medium, the most swelling portion due to the back pressure is the center portion, so that the filter member may swell in the center portion and the rib may pierce the filter medium. Needless to say, the ribs may have a shape in which the tips of the ribs are connected by a ring, but this is not preferable because the filtering function is reduced and the cost is increased.

The length of the rib 4 depends on the size of the disc, but in the case of a disc having an outer diameter of 200 mm, the outer diameter is 10
The length is preferably 5 mm or more.

As shown in FIG. 4, the rib 4 is fixed to the back surface of the ring-shaped plate 2 so that the plate and the front surface are flush with each other. When the ribs 4 are simply provided on the outer periphery of the plate 2, the filter material may swell to break the ribs 4 from the connecting portion. However, if formed in this way, the ribs 4 can be effectively prevented from breaking. .

The distance between the tip of the rib 4 and the surface of the filter medium is 1 to
It is preferably 5 mm. If this interval is too narrow, a sufficient filtration channel cannot be obtained, and if the interval is too wide, it is not possible to suppress the swelling of the filter medium during back pressure.

In the above embodiment, the plate 2 suppresses the bulges of the filter cells at the upper and lower ends and enhances the back pressure strength. However, other means can be used as long as the bulges of the filter cells can be suppressed. Is also good.

The ribbed plates shown in FIGS. 2 and 3 are
It can be made from a suitable synthetic resin such as polyolefin or polyamide.

In the filter cells other than the uppermost portion and the lowermost portion of the cell type filter cartridge, the swelling of the filtering material occurs when the back pressure is applied, but the adjacent filter cells suppress the swelling of each other and swell. It works to prevent

FIG. 5 shows an example in which the cell type filter cartridges shown in FIG. 1 are stacked in four stages. Similarly, if the lengths of the upper end filter cell 1 and the upper holding plate 5, the lower end filter cell 1 and the bottom baffle plate 6, and the connecting portion 7 between the cell type filter cartridges are shortened so as to prevent the filter cell from expanding. The burst strength of the filter cell can be increased. The upper holding plate 5 and the bottom baffle plate 6 are used when they are set in the housing.

The lengths of the upper filter cell 1 and the upper holding plate 5, and the lower filter cell 1 and the bottom baffle plate 6 can be controlled by the height of the plate, but the lengths of 1 to 11 can be controlled.
It is better to adjust the plate height so that it becomes mm. If the interval is too narrow, a sufficient filtration channel cannot be obtained, and if the interval is too wide, the swelling of the filter material under back pressure cannot be suppressed and the filter material bursts.

For the same reason, the length of the connecting portion 7 between the cell type filter cartridges is preferably controlled by the height of the plate so that the distance between the filter cells is 1 to 11 mm.

[0027]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Example 1 A filter paper for a depth filter having a thickness of about 4 mm, which comprises a pulp and a diatomaceous earth as a filter material, is injection-molded into a disk cell having a diameter of 284 mm, and the filter cell is combined with an inner ring to form 16 multi-stages. Were stacked on top of each other and connected together to form a set of cell type filter cartridges (FIG. 1).

Then, as shown in FIG. 5, the above four cell-type filter cartridges were set in a filter housing in a four-stage stack, and water was passed by backflow in the backpressure test line shown in FIG.

Then, the flow rate was adjusted to 2 to 6 t / h,
The burst pressure of the filter medium was measured by applying water pressure (reverse pressure). With respect to the cell type filter cartridge of 16 plate ribs type of the present invention, the same operation as above was carried out to measure the burst pressure of the filter medium. The results are shown in Table 1 below.

[0031]

[Table 1] From the above results, it can be seen that when the ribbed plate of the present invention is used, the burst strength is remarkably increased as compared with the case where the conventional plate is used, and the breakage of the filter medium is significantly suppressed.

[0032]Reference example 1 Then change the plate height without using the ribbed plate.
The same operation as in Example 1 except that the
Measure the burst strength ratio when the height of the chair is 10.5 mm
did. The results are shown in Table 2 below.

[0033]

[Table 2] From the above results, if the plate height is 6 mm or less,
The distance between the uppermost filter material and the holding plate can be set to 11 mm or less, and as in the case of using the ribbed plate of the present invention, the burst strength is increased to about 4 times and the damage of the filter material is remarkable. You can see that it is suppressed to.

Experiments have confirmed that the rupture phenomenon first discovered by performing the integrity test is due to the expansion of the filter medium due to the back pressure in view of the rupture state.

It has also been confirmed by experiments that this rupture phenomenon occurs between the filter materials at the top and bottom or between cell filter cartridges when cell filter cartridges are stacked in multiple stages.

By providing a means for suppressing the expansion of the filtering material at these portions, it is possible to obtain a cell type cartridge excellent in back pressure durability without changing the paper strength, the filtration line and the like.

As shown in FIGS. 2 and 3, as means for suppressing the expansion of the filter medium, the plate is provided with ribs, or the distance between the plate and the upper holding plate or the bottom baffle plate and the cell One example is to shorten the space between mold filter cartridges. By using the ribbed plate and reducing the distance, the durability against back pressure is significantly improved.

[0038]

As described above, according to the present invention, since the integrity test has not been conducted in the past, it is possible to effectively suppress the rupture of the filter medium due to the back pressure, which has never been noticed in the past, and to perform the proper test. Not only is it possible to perform filtration, but it is also possible to confirm an accurate rise in differential pressure due to clogging, so it is easy to understand the replacement criteria for the filter cartridge. It has a term effect.

[Brief description of drawings]

FIG. 1 is a side view of a conventional cell-type filter cartridge.

FIG. 2 is a front view of a ribbed plate of the present invention.

FIG. 3 is a surface view showing another example of the ribbed plate of the present invention.

FIG. 4 is a perspective view of a ribbed plate of the present invention.

FIG. 5 is a side view showing a state where cell filter cartridges are stacked in four stages.

FIG. 6 is a block diagram showing a back pressure test line of the present invention.

[Explanation of symbols]

1 ... Filter cell 2 ... Plate 3 ... Cell type filter cartridge 4 ... rib 5 ......... Top pressing plate 6 ... Bottom baffle plate 7 ... Connection between cell-type filter cartridges

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Wataru Nomura Wataru Nomura 6-20-12 Minamioi, Shinagawa-ku, Tokyo Loki Techno Co., Ltd. (72) Inventor Masa Yoshino 6-20-12 Minamioi, Shinagawa-ku, Tokyo Stock Association Company Loki Techno (72) Inventor Tomoya Igarashi 6-20-12 Minamioi, Shinagawa-ku, Tokyo Stock Company Loki Techno (72) Inventor Hitoshi Kinoshita 6-20-12 Minamioi, Shinagawa-ku, Tokyo House Roki Techno ( 56) References JP-A-3-106408 (JP, A) Actual development 3-38133 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 29/39 B01D 29/66

Claims (5)

(57) [Claims] 1. A cell type filter cartridge in which filter cells made of filter paper or calcined filter material are stacked in multiple stages, and a pre-holding filter cell at the upper end and the lower end.
And a large number of ribs radially around the ring-shaped plate.
A cell-type filter cartridge, characterized in that the filter material is formed by forming the filter material to enhance the back pressure strength of the filter material. 2. The filter cartridge according to claim 1, wherein the filter cell is a filter cell in which an outer peripheral portion of a disk-shaped filter material is sealed with a ring. Wherein said ring-shaped plate back surface, filter cartridge according to claim 1 or 2 formed of a fixed end portion of the rib. 4. The length of the rib is defined as the radius length.
A contract in which the tip has a length that reaches the center of the filter medium
The filter cartridge according to any one of claims 1 to 3.
J. 5. The distance between the rib tips and the surface of the filter medium is
It is 1-5 mm, and the fi lie according to any one of claims 1 to 4.
Luther cartridge.