JP2017006903A - Filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross-flow filter type filtering device which effectively filters a fluid.SOLUTION: A filtering device comprises a housing 1 and a double cylindrical filter arranged in the housing 1. The double cylindrical filter comprises: a cylindrical outer cylinder filter 2; and a cylindrical inner filter 3 arranged at the inner side of the outer cylinder filter 2, and a filtration passage 5 is formed between the filters 2, 3. The filtering device further includes: a supply chamber 10 for introducing a fluid into the filtration passage 5; a first discharge chamber 11 for discharging the fluid flowing out from the filtration passage 5 to the outside of the housing 1; a second discharge chamber 12 for discharging the fluid, which is filtered by the outer cylinder filter 2 when flowing through the filtration passage 5, to the outside of the housing 1; and a third discharge chamber 13 for discharging the fluid, which is filtered by the inner cylinder filter 3 when flowing in the filtration passage 5, to the outside of the housing 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cross-flow filtration device provided with a double cylindrical filter.

  The filtration method includes a total amount filtration method for filtering all the fluid to be filtered through a filter, and a cross flow filtration method for filtering the fluid by flowing along the surface of the filter (see, for example, Patent Documents 1 and 2). There is.

  The crossflow filtration type filtration device includes, for example, one cylindrical filter, and allows a fluid to flow into the inside from one end of the filter. A part of the fluid is filtered by the peripheral side surface of the filter and discharged from the peripheral side surface to the outside, and the fluid not filtered is discharged from the other end of the filter to the outside. Thus, in the cross flow filtration method, a cylindrical filter is generally used.

  The cross-flow filtration method has a problem that the filtration efficiency is poor, although filtration can be performed while suppressing the accumulation of solid matter on the surface of the filter.

Japanese Patent Laid-Open No. 01-065281 Japanese Patent Laid-Open No. 08-52305

  Then, an object of this invention is to provide the filtration apparatus of the crossflow filtration system which can filter a fluid efficiently.

The present invention is a cross-flow filtration type filtration device,
A housing;
A double cylindrical filter disposed in the housing, the double cylindrical filter comprising: a cylindrical outer cylinder filter; and a cylindrical inner cylinder filter disposed inside the outer cylinder filter; A filtration flow path is formed between the outer cylinder filter and the inner cylinder filter,
A supply chamber for introducing a fluid into the filtration channel, formed in the housing to communicate with one end of the filtration channel;
A first discharge chamber formed in the housing so as to communicate with the other end of the filtration channel, and for discharging the fluid flowing out of the filtration channel to the outside of the housing;
A second discharge chamber formed between the housing and the outer cylinder filter, for discharging the fluid filtered by the outer cylinder filter when flowing through the filtration channel, to the outside of the housing;
A third discharge chamber formed by a tube connected to the inner cylinder filter, for discharging the fluid filtered by the inner cylinder filter when flowing through the filtration channel, to the outside of the housing; It is characterized by that.

  Preferably, each of the outer cylinder filter and the inner cylinder filter is a wedge wire filter having a wire having a wedge-shaped cross section wound spirally at a predetermined pitch.

Preferably, the supply chamber has a cylindrical side wall,
A supply pipe is connected to the supply chamber such that fluid is introduced from the outside of the housing into the supply chamber in a tangential direction of the side wall;
Each of the outer cylinder filter and the inner cylinder filter is a wedge wire filter having a plurality of wires each having a wedge-shaped cross-section extending in the longitudinal direction of the filtration channel and arranged side by side on the circumference. .

  ADVANTAGE OF THE INVENTION According to this invention, by providing the said structure, the crossflow type filtration apparatus which can filter a fluid efficiently can be provided.

It is a schematic longitudinal cross-sectional view of the filtration apparatus which concerns on one Example of this invention. It is an enlarged view of the area | region A of FIG. 1, and shows the longitudinal cross-sectional view of an outer cylinder filter and an inner cylinder filter. It is a figure explaining the filtration apparatus which concerns on another Example, FIG. 3A is a cross-sectional view of the supply chamber of a housing, FIG. 3B is a cross-sectional view of an outer cylinder filter and an inner cylinder filter.

  Hereinafter, an embodiment of a cross-flow filtration device according to the present invention will be described with reference to the drawings.

  The filtration device includes a cylindrical housing 1. The housing 1 is supported by a support base (not shown) so that the longitudinal direction thereof is the vertical direction. Furthermore, the filtration device includes a double cylindrical filter disposed in the housing 1. The double cylindrical filter is disposed in the housing 1 so that the longitudinal direction thereof is the vertical direction. The double cylindrical filter includes a cylindrical outer cylinder filter 2 and a cylindrical inner cylinder filter 3 disposed inside the outer cylinder filter 2.

  The outer cylinder filter 2 is configured such that its inner peripheral surface becomes a primary side surface (unfiltered side surface) and its outer peripheral surface becomes a secondary side surface (prefiltered side surface). The inner cylinder filter 3 is configured such that an outer peripheral surface thereof is a primary side surface and an inner peripheral surface thereof is a secondary side surface.

  FIG. 2 is an enlarged view of region A in FIG. In this embodiment, the outer tube filter 2 and the inner tube filter 3 are wedge wire filters each having a wedge-shaped wire 20 and 30 wound spirally at a predetermined pitch. Filtration slits S2 and S3 (FIG. 2) are formed by the gap. The outer cylinder filter 2 has a plurality of support rods 21 that support the wire 20 wound in a spiral shape from the outside. The inner cylinder filter 3 includes a plurality of support rods 31 that support the spirally wound wire 30 from the inside.

  An annular mounting body 40 is provided at both ends of the outer tube filter 2. The attachment body 40 is attached to an annular attachment body 41 provided in the housing 1, whereby the outer cylinder filter 2 is supported and positioned with respect to the housing 1. An O ring 42 is provided between the mounting bodies 40 and 41 and seals between them.

  The inner cylinder filter 3 is connected to a cylindrical tube body 43 at the upper end (one end), and the tube body 43 extends so as to penetrate the upper end surface of the housing 1 in an airtight manner. A closing body 44 is provided at the lower end (the other end) of the inner cylinder filter 3, and the lower end is closed. Further, a support body 45 is provided in the housing 1, and the convex portion of the closing body 44 is fitted in the concave portion of the support body 45. Thereby, the inner cylinder filter 3 is supported and positioned with respect to the housing 1.

  The outer cylinder filter 2 and the inner cylinder filter 3 are positioned concentrically by being positioned as described above. A predetermined gap is provided between the inner peripheral surface of the outer cylindrical filter 2 and the outer peripheral surface of the inner cylindrical filter 3, whereby the filtration flow path 5 is provided between the outer cylindrical filter 2 and the inner cylindrical filter 3. It is formed. The filtration channel 5 extends in the vertical direction and has an annular shape.

  A supply chamber 10 is formed in the upper part of the housing 1 and communicates with the upper end of the filtration channel 5. The supply chamber 10 is for introducing a fluid that is symmetrical to the filtration into the filtration channel 5. A supply pipe 60 is connected to the supply chamber 10, and fluid is introduced from the outside of the housing 1 into the supply chamber 10 through the supply pipe 60.

  A first discharge chamber 11 is formed in the lower part of the housing 1 and communicates with the lower end of the filtration channel 5. The first discharge chamber 11 is for discharging the fluid flowing out from the lower end of the filtration channel 5 to the outside of the housing 1. A first discharge pipe 61 is connected to the first discharge chamber 11, and fluid flows out of the housing 1 through the first discharge pipe 61 from the first discharge chamber 11.

  A second discharge chamber 12 is formed between the housing 1 and the outer cylinder filter 2. The second discharge chamber 12 is for discharging the fluid filtered by the outer cylinder filter 2 to the outside of the housing 1 when flowing through the filtration flow path 5. A second discharge pipe 62 is connected to the upper part of the second discharge chamber 12, and fluid flows out of the housing 1 through the second discharge pipe 62 from the second discharge chamber 12. The upper mounting bodies 40 and 41 partition the supply chamber 10 and the second discharge chamber 12, and the lower mounting bodies 40 and 41 define the first discharge chamber 11 and the second discharge chamber 12. The space is partitioned.

  The third discharge chamber 13 is formed by the tube body 43 connected to the inner cylinder filter 3 and communicates with the inner side of the inner cylinder filter 3. The third discharge chamber 13 is for discharging the fluid filtered by the inner cylindrical filter 3 to the outside of the housing 1 when flowing through the filtration flow path 5. The third discharge pipe 63 is connected to the upper part of the third discharge chamber 13 so that fluid flows out of the housing 1 from the third discharge chamber 13 through the third discharge pipe 63.

  A supply means (not shown) for supplying fluid to the supply chamber 10 through the supply pipe 60 is provided. The filtration device can be used as a concentration device for concentrating a solid-liquid mixture composed of a solid and a liquid, such as a slurry, as a fluid symmetrical to filtration. At this time, the supply means is a pump that is provided upstream of the supply pipe 60 and press-fits the solid-liquid mixture 1 into the supply chamber 10.

  Moreover, a filtration apparatus can be utilized as a dust collector which makes the solid-gas mixture which consists of solid and gas the fluid of filtration symmetry. At this time, the supply means includes a suction blower that is provided downstream of the second discharge pipe 62 and downstream of the third discharge pipe 63 and generates a negative pressure in the housing 1.

  Next, operation | movement of a filtration apparatus is demonstrated. Below, the case where a filtration apparatus is utilized as a concentration apparatus is demonstrated to an example.

  The slurry is press-fitted into the supply chamber 10 by the supply means through the supply pipe 60 and flows into the filtration channel 5 from its upper end. When the slurry flows through the filtration channel 5, a part of the slurry is filtered by the outer cylinder filter 2, and the liquid component flows out to the outside (second discharge chamber 12) of the outer cylinder filter 2 through the slit S 2. Alternatively, a part of the slurry is filtered by the inner cylinder filter 3, and the liquid component flows out to the inside of the inner cylinder filter 3 through the slit S3.

  Then, the liquid component filtered by the outer cylinder filter 2 is discharged out of the housing 1 through the second discharge chamber 12 and the second discharge pipe 62. The liquid component filtered by the inner cylinder filter 3 is discharged out of the housing 1 through the third discharge chamber 13 and the third discharge pipe 63.

  By removing the liquid component in this way, the slurry flowing through the filtration flow path 5 is concentrated. Accordingly, the slurry flows out from the lower end of the filtration channel 5 to the first discharge chamber 11 in a concentrated state. Then, the concentrated slurry is discharged out of the housing 1 through the first discharge chamber 11 and the first discharge pipe 61.

  Thus, the filtration device filters and concentrates the slurry by a cross flow filtration method.

  The case where the filtration device is used as a dust collector will also be briefly described. A solid-gas mixture consisting of solid (dust) and gas is introduced from the upper end into the filtration channel through the supply pipe 60 and the supply chamber 10 by the supply means. And when a solid-gas mixture passes the filtration flow path 5, a part is filtered by the outer cylinder filter 2 or the inner cylinder filter 3, and only gas is outside the outer cylinder filter 2 or the inner cylinder filter 3. Flows out. Then, the filtered gas is discharged out of the housing 1 through the second discharge chamber 12 or the third discharge chamber 13.

  Thereby, the density of the solid in the filtration flow path 5 is increased, and the solid is collected from the lower end of the filtration flow path 5 to the first discharge chamber 11 together with the gas and flows out of the housing 1 through the discharge pipe 61. To be discharged.

  Thus, the filtration device collects dust by filtering the solid-gas mixture by a cross flow filtration method.

  As described above, the filtration device according to the embodiment includes the outer cylinder filter 2 and the inner cylinder filter 3, and the filtration flow path 5 is formed between the filters 2 and 3. Accordingly, the fluid flows along both the inner peripheral surface of the outer cylindrical filter 2 and the outer peripheral surface of the inner cylindrical filter 3, and is filtered by both the filters 2 and 3. That is, since a sufficiently large filtration area is ensured as compared with the conventional technique in which filtration is performed by a cross flow filtration method using only one cylindrical filter, it is possible to effectively filter the fluid.

  There are also the following modifications. As shown in the cross-sectional view of FIG. 3A, the supply chamber 10 has a cylindrical side wall 10a. The supply pipe 60 is connected to the supply chamber 10 so that the fluid is introduced in the tangential direction of the side wall 10a. Thereby, when the fluid is introduced into the supply chamber 10, a swirling flow is generated in the supply chamber 10.

  The outer cylinder filter 2 and the inner cylinder filter 3 are arranged side by side at intervals on the circumference, as shown in the cross section of FIG. 3B, instead of the configuration of FIG. This is a wedge wire filter having a plurality of wires 20 and 30 having a wedge-shaped cross section extending in the longitudinal direction. That is, the slits S2 and S3 for filtration extending in the longitudinal direction of the filtration channel 5 are formed by the gap between the adjacent wires 20 and 30.

  When the fluid is introduced into the supply chamber 10 and a swirling flow is generated, the fluid spirally flows from the upper end to the lower end of the annular filtration channel 5. Therefore, the fluid flows across the plurality of slits S2 and S3 extending in the vertical direction. Thereby, the fluid is more effectively filtered by the outer cylinder filter 2 and the inner cylinder filter 3.

  In the above embodiment, the housing 1, the outer cylinder filter 2, and the inner cylinder filter 3 are arranged so that their longitudinal directions are in the vertical direction, but these are horizontal in their longitudinal direction. May be arranged as follows.

  Further, the outer cylinder filter 2 and the inner cylinder filter 3 may be other filters instead of the wedge wire filter.

DESCRIPTION OF SYMBOLS 1 Housing 10 Supply chamber 10a Side wall 11 1st discharge chamber 12 2nd discharge chamber 13 3rd discharge chamber 2 Outer cylinder filter 20 Wire 3 Inner cylinder filter 30 Wire 43 Tube 5 Filtration flow path 60 Supply pipe S2 Slit S3 Slit

Claims (3)

A cross-flow filtration device,
A housing;
A double cylindrical filter disposed in the housing, the double cylindrical filter comprising: a cylindrical outer cylinder filter; and a cylindrical inner cylinder filter disposed inside the outer cylinder filter; A filtration flow path is formed between the outer cylinder filter and the inner cylinder filter,
A supply chamber for introducing a fluid into the filtration channel, formed in the housing to communicate with one end of the filtration channel;
A first discharge chamber formed in the housing so as to communicate with the other end of the filtration channel, and for discharging the fluid flowing out of the filtration channel to the outside of the housing;
A second discharge chamber formed between the housing and the outer cylinder filter, for discharging the fluid filtered by the outer cylinder filter when flowing through the filtration channel, to the outside of the housing;
A third discharge chamber formed by a tube connected to the inner cylinder filter, for discharging the fluid filtered by the inner cylinder filter when flowing through the filtration channel, to the outside of the housing;
A filtration device characterized by that.   2. The filtration device according to claim 1, wherein each of the outer cylinder filter and the inner cylinder filter is a wedge wire filter having a wedge-shaped cross-section wound spirally at a predetermined pitch. . The supply chamber has a cylindrical side wall,
A supply pipe is connected to the supply chamber such that fluid is introduced from the outside of the housing into the supply chamber in a tangential direction of the side wall;
Each of the outer cylinder filter and the inner cylinder filter is a wedge wire filter having a plurality of wires each having a wedge-shaped cross-section extending in the longitudinal direction of the filtration channel and arranged side by side on the circumference. The filtration device according to claim 1, wherein:

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