JP2012206036A - Cellular cartridge filter - Google Patents

Abstract

[PROBLEMS] To prevent a gap between the gaskets at the connecting portion of the cell type cartridge filter from being displaced and to prevent a compression force between the gaskets from being reduced by a stress acting at right angles to the axis of the multi-layered laminate, and a product before filtration. Provided is a cell type cartridge filter capable of preventing contamination of a product after filtration.
[Structure] In a multi-layered cell type cartridge filter, the upper end plate and the lower end plate of the cell type cartridge filter are connected to each other as they are or through a member for connecting and connecting them. Clearance prevention and gap formation against the decrease in compressive force between gaskets were completely prevented.
[Selection] Figure 1

Description

  The present invention relates to a cell type cartridge filter connected in a plurality of stages, and more particularly to a cell type cartridge filter having improved sealing performance at a connecting portion between the cell type cartridge filters.

  A cell-type cartridge filter is formed by sandwiching a rib-shaped spacer with a disk-shaped filter medium made of filter paper or a baked filter medium, and sealing the outer periphery with a ring to form a cell-type filter. It is widely used in the food industry, the chemical industry, the pharmaceutical industry, and the like due to the feature that the filtration area of the filter is larger than the capacity. Particularly in applications where large volumes of liquid are filtered in the food industry, etc., multiple layers of cell-type cartridge filters are stacked and pressurized using the center shaft screw installed in the filter housing to make it liquid-tight. Connected and used.

  However, when the filter medium used in the cell type cartridge filter is filter paper, the cell type cartridge filter contracts because the elastic force of the filter medium is reduced due to the influence of the filtration treatment liquid and heat. For this reason, in order to pressurize the center shaft with a screw, a metal coil spring is installed to maintain the compressive force between the gaskets so as not to damage the seal even if the filter medium contracts.

Cell type cartridge filters are affected by the effects of product heat, changes in pressure on the primary side, and back pressure generated from the piping on the secondary side when filtering the product (filtered liquid) in a given process. As a result, part of the filter medium was destroyed, and the product before filtration was mixed into the product after filtration (hereinafter referred to as “leak”). For this reason, Patent Document 1 proposes a cartridge filter that prevents deformation of the filter medium due to heat. In Patent Document 2 and Patent Document 3, a proposal to improve the fracture resistance of the filter medium against the reverse pressure generated from the secondary side pipe is made, and in Patent Document 4, a test method for the reverse pressure resistance is proposed.
Japanese Patent No. 04065762 Japanese Patent No. 3371366 Japanese Patent No. 3187786 Patent No. 03402592

However, there have been no examples of evaluation and examination so far regarding leakage at the connection between cell type cartridge filters when the cell type cartridge filters are used in a plurality of layers. This is because even if leaks occur intermittently between the connections, there is no significant change in the filtration plant control values such as filtration flow rate and cartridge filter differential pressure, and it is difficult to detect during filtration operation, Moreover, it is because it was difficult to determine a leak location even if abnormalities, such as a leak, were confirmed by inspecting the product after filtration.

  However, as a result of diligent research by the present inventors, when cell-type cartridge filters are used in multiple layers, the product before filtration leaks at the gasket contact surface at the connection between the cell-type cartridge filters, and after filtration For the first time, it has been found that it may be mixed into other products. Leakage at the contact surface of the gasket is not at a level that can be detected by the differential pressure of the cartridge filter (the operating pressure difference between the primary side and the secondary side). This is a very important issue because the presence or absence of a leak is judged by observing and confirming the presence or absence of a leak, and even if a leak is confirmed, it is not possible to immediately take measures against the filtered product. Is the discovery.

  The present invention has been made on the basis of the above knowledge, and prevents the displacement between the gaskets of the connection part of the cell type cartridge filter and the reduction of the compressive force between the gaskets against the stress acting at right angles to the axis of the multi-layer stack. It is an object of the present invention to provide a cell type cartridge filter that can prevent the formation of a gap with respect to the product and prevent the product before filtration from mixing into the product after filtration.

  According to the configuration of the present invention that meets the above-described object, in the cell type cartridge filter laminated in a plurality of stages, the upper end plate and the lower end plate of the cell type cartridge filter are fitted as they are or via a member that fits and connects them. It is characterized by being connected together.

  It is only necessary that one opening of the cylindrical body is fitted to one end plate, the other opening is fitted to the other end plate, and both are fitted and connected.

  One end plate may be formed in a large diameter that can be fitted to the other end plate, and both may be fitted and connected.

  An upper end plate and a lower end plate may be externally fitted to a cylindrical body or a cylindrical body having a fluid flow path, and both may be fitted and connected.

  Since the cell type cartridge filter of the present invention can completely prevent gaps between gaskets and the gap between the gaskets from decreasing in compressive force, it can completely prevent the product before filtration from being mixed into the product after filtration. Has a great effect.

It is a schematic sectional drawing which shows the example which laminated | stacked the conventional cell type cartridge filter in 3 steps | paragraphs. It is a schematic sectional drawing which shows the example which laminated | stacked the cell type cartridge filter of this invention in 3 steps | paragraphs. It is a schematic sectional drawing which shows the effect of the connection ring of this invention. It is sectional drawing which shows the cell type cartridge filter of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a conventional cell type cartridge filter in which cell type cartridge filters are laminated in three stages and are built in a filter housing. The cell type filter is compressed by a load jig tool through a coil spring so as not to impair the sealing by the gasket of the connecting portion. A center shaft is inserted into the core through which the filtrate flows, and a fin-type guide inserted through the center shaft is positioned in the vicinity of the connection portion between the cell type cartridge filters for the purpose of preventing displacement.

  FIG. 2 shows a cell type cartridge filter in which the cell type cartridge filters of the present invention are stacked in three stages. The upper end plate of one cell type cartridge filter and the other cell type are formed by a cylindrical ring (connection ring). The cartridge filter is coupled to the lower end plate of the cartridge filter. The rest of the configuration is the same as in FIG. In this case, the fin type guide is not particularly required.

  As shown in FIG. 3, the conventional filter shown in FIG. 1 is normally connected as shown in FIG. 3 (a). However, the stress shown in FIG. Thus, a leak occurs due to the occurrence of deviation or the formation of a gap with respect to a decrease in compressive force between gaskets.

  On the other hand, the filter of the present invention shown in FIG. 2 is displaced or inclined with respect to stress acting at right angles to the axis as shown in FIG. To prevent. Even if a very large force is applied and tilted as shown in FIG. 3D, the ring functions as a sealant and prevents leakage.

  In the present invention, the upper end plate and the lower end plate of the cell type cartridge filter are fitted and connected as they are or via a member for fitting and connecting them.

  The embodiment shown in FIG. 2 is an example in which one opening of the cylindrical body is fitted to the upper end plate, and the other opening is fitted to the lower end plate, and both are fitted and connected.

  An upper end plate and a lower end plate may be externally fitted to a cylindrical body or a cylinder having a fluid flow path, and both may be fitted and connected. For example, in FIG. 1, a through-hole through which a fluid passes may be formed in the fin-shaped guide, and this may be fitted to the core of the connection portion, and both may be fitted and connected.

  FIG. 4 shows another embodiment of the present invention, in which a large-diameter connecting ring that can be externally fitted to the lower end plate is added to the upper end plate of the cell type cartridge filter by integral molding, and both are fitted and connected. An example of what can be done is shown.

The end plate is made of synthetic resin, but it is preferable that the connecting member (connecting ring) is also made of synthetic resin.
(Investigation of leak traces between gaskets)
The gasket surface was visually observed during the replacement work after the life of the cartridge filter, and it was determined that there was a leak by confirming the presence or absence of a trace of the leak.
(1) The clearance was 2 mm even when dimensional tolerances were taken into consideration with a fin-type guide φ48 mm and a core inner diameter φ51 mm. Since the gasket contact width was 12 mm and the width of the most compressed portion was 2 mm, it was determined that the cause of the leak was not mounting displacement.

(2) Compressive stress of the gasket The compressive stress at the time of setting is determined by the compression length of the coil spring and is 3.8kg / cm ² ± 0.5 taking into account the dimensional tolerance of the cell type cartridge filter. The shrinkage at that time was 10 mm ± 5 mm per step, and the compressive stress after shrinkage was a minimum of 2.1 kg / cm ^2. Therefore, it was judged that the seal holding force was sufficient.

  From the results of the above (1) and (2), it was determined that a leak occurred from the connecting portion connected via the gasket, although the cell type cartridge filter itself was normal.

The cell type cartridge filter of the present invention can completely prevent the product before filtration from being mixed into the product after filtration, but the conventional cell type cartridge filter has a great advantage because it cannot completely prevent it. Therefore, it is expected to spread widely.

Claims (4)

In a multi-layered cell type cartridge filter, the upper end plate and the lower end plate of the cell type cartridge filter are connected as they are or through a member for connecting and connecting them. Cell type cartridge filter layered on. The cell type cartridge filter according to claim 1, wherein one opening of the cylindrical body is fitted to one end plate, the other opening is fitted to the other end plate, and both are fitted and connected. The cell type cartridge filter according to claim 1 or 2, wherein one end plate is formed in a large diameter that can be fitted to the other end plate, and both are fitted and connected. The cell type cartridge filter according to any one of claims 1 to 3, wherein an upper end plate and a lower end plate are externally fitted to a cylindrical body or a cylindrical body having a fluid flow path, and both are fitted and connected. .

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