JP5710243B2 - Backwash type filtration device - Google Patents

Description

  The present invention relates to a backwashing type filtration apparatus capable of washing raw water with a filtration element and washing the filtration element by flowing the filtered water back.

  This type of backwashing type filtration apparatus includes a pressure vessel and a plurality of cylindrical filtration elements arranged in the pressure vessel.

  During the filtration operation of the backwash type filtration device, the raw water is allowed to flow inside the filtration element and pass through the filtration channel formed in the filtration element, while the filtration element is appropriately selected from a plurality of filtration elements On the other hand, continuous filtration is enabled by reversing the filtered water to remove microorganisms or suspended solids clogged in the filtration flow path and washing the filtration element sequentially (for example, Patent Document 1, Patent Document 2).

  And as a filtration element, what wound wires, such as a notch wire, is known (for example, patent documents 3).

  However, a filtration element configured by winding a wire has a problem in strength because it has a small wire diameter and is easily deformed against a hydraulic pressure.

  Therefore, in order to solve such problems, a filter element in which a disk-type filter medium is laminated has been proposed (for example, Patent Document 4). Since the disk-type filter medium can sufficiently secure a width in the radial direction, a sufficient strength can be ensured.

Utility Model Registration No. 3137987 JP 2001-170416 A JP 2000-1117013 A JP 2001-300216 A

  However, a filter element with a disc-shaped filter medium laminated increases the length of the filter flow path between the filter mediums to the extent that a sufficient radial width can be secured. There was a problem that the amount of processing was reduced. Moreover, there has been a problem that microorganisms and the like clogged in the filter element cannot be sufficiently removed during backwashing.

  In view of the above problems, the present invention provides a backwash type filtration device that is excellent in raw water treatment capacity and can effectively remove microorganisms and the like clogged in the filtration element during backwashing. .

The backwash type filtration apparatus according to claim 1 is:
A pressure vessel, and a cylindrical filtration element disposed in the pressure vessel, the raw water is filtered from the inside to the outside of the filtration element and filtered, and the filtered water is allowed to flow backward to filter the filtration element. A backwash type filtration device for cleaning,
The filtration element is configured by laminating a disk-type filter medium in which a filtration channel forming groove is formed in a radial direction, and forming a filtration channel between the upper and lower filter media, and the inside of the pressure vessel A plurality of circumferences are arranged,
The flow path height of the filtration flow path is configured such that the downstream side is higher than the upstream side,
Furthermore, it is configured such that at least one of the filtration elements is connected to a backwash tube for washing the filtration element by flowing the filtered water back to the filtration element.
By rotating the backwash tube and switching the connection with the plurality of filtration elements arranged circumferentially , the filtration element is washed in the filtration element to which the backwash tube is connected, and the backwashing is performed. It is characterized by being configured to filter raw water in a filtration element to which no pipe is connected.

The backwash type filtration apparatus according to claim 2 is:
The filtration flow path includes an upstream portion, a midstream portion, and a downstream portion from the inside of the filtration element, and the upstream portion is formed at the same flow path height over the entire length, and the midstream portion is a flow path toward the downstream side. The height is increased, and the downstream portion is configured so that the flow path height does not become smaller than that of the midstream portion .

The backwash type filtration device according to claim 3 is:
The inclination angle of the bottom surface of the filtration flow path forming groove corresponding to the midstream portion is 0.5 to 5 degrees.

The backwash type filtration device according to claim 4 is:
The channel height of the upstream part is 10 to 100 μm, and the channel length of the upstream part is 5 to 30% or less with respect to the total length of the filtration channel.

The backwash type filtration apparatus according to claim 5 is:
The downstream portion is formed to have the same flow path height over the entire length.

  According to the present invention, it is possible to provide a backwashing type filtration apparatus that is excellent in raw water treatment capacity and can effectively remove microorganisms and the like clogged in the filtration element during backwashing.

It is sectional drawing which shows the structure of the backwashing type | mold filtration apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing of the AA line shown in FIG. It is a perspective view which shows the filtration element of the backwashing type | mold filtration apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the filter material of the filtration element of the backwashing type | mold filtration apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which expanded a part of filtration element of the backwashing type | mold filtration apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view which shows a part of filtration element of the backwashing type filtration apparatus which concerns on the 2nd Embodiment of this invention.

  Hereinafter, the present invention will be described based on embodiments.

(First embodiment)
1. 1 is a cross-sectional view showing a configuration of a backwashing filtration apparatus according to the present embodiment. 2 is a cross-sectional view taken along line AA shown in FIG.

  As shown in FIGS. 1 and 2, the backwashing type filtration apparatus 1 includes a pressure vessel 2 and a plurality of cylindrical filtration elements 6 arranged in the pressure vessel 2. The raw water is passed through to the outside and filtered, while the filtered water is made to flow backward to wash microorganisms and the like clogged in the filter element 6. In FIG. 1, 3 is an inlet for raw water, 4 is an outlet for filtered water, 5 is a partition plate, 8 is backwashing means, and 9 is a motor.

  The interior of the pressure vessel 2 is partitioned into a raw water chamber 11 having an inflow port 3 and a filtered water chamber 12 having an outflow port 4 by a partition plate 5 having a plurality of openings 10.

  The plurality of filtration elements 6 are disposed on the filtered water chamber 12 side, and the bottom opening 14 of the filtration element 6 is attached to the plurality of openings 10 of the partition plate 5.

  Then, the raw water is pumped by a non-illustrated pump and is filtered after flowing from the inlet 3 through the raw water chamber 11 into the filter element 6 through the opening 10 as shown by the solid line arrow in FIG. And flows out into the filtered water chamber 12 as filtered water. On the other hand, the backwashing means 8 is used to backwash the filtration element 6 during the filtration operation.

2. Backwashing means As shown in FIG. 1, the backwashing means 8 includes a backwashing pipe 21 having one end opened to atmospheric pressure, the other end of the backwashing pipe 21 branches, and each branch pipe 21a, 21b. Are provided with backwash nozzles 20a and 20b. The backwash tube 21 is connected to the motor 9 by a rotating shaft 22.

  Then, during the filtration operation, the backwash tube 21 is rotated to connect the backwash nozzles 20a, 20b to the opening 10 of the partition plate 5 in order, so that the filtered water is filtered inside the filtration element 6 by utilizing the pressure difference. Then, the liquid flows backward through the backwash pipe 21 as shown by the broken line arrow and is discharged from one end of the backwash pipe 21 to the outside. Thereby, microorganisms and the like clogged in the filter element 6 are removed.

3. FIG. 3 is a perspective view showing a filtration element of the backwashing type filtration apparatus according to the present embodiment, and FIG. 4 is a perspective view showing a filtering material of the filtration element of the backwashing type filtration apparatus according to the present embodiment. FIG. 5 is an enlarged cross-sectional view of a part of the filtration element of the backwash type filtration apparatus according to the present embodiment.

  As shown in FIGS. 3 to 5, the filtration element 6 includes a laminated body in which a filter medium 7 having a disk shape and a filtration channel forming groove 15 formed on the upper surface is laminated, and the upper filter medium 7 is flat. The lower flow path 16 is formed by the lower surface and the filtration flow path forming groove 15 of the lower filter medium 7, and the upper opening of the uppermost filter medium 7 is closed by the top plate 13.

  As shown in FIG. 3, the fixing means for the filtration element 6 includes a rod bolt 17 and a positioning rod 19 erected on the partition plate 5 (see FIG. 1). The fixed grooves 7a (see FIG. 4) are formed, these fixed grooves 7a are fitted to the positioning rods 19, the upper ends of the rod bolts 17 and the positioning rods 19 are inserted into the mounting holes 13a of the top plate 13, A nut 18 is fitted to the upper end of the rod bolt 17. Thereby, the laminated body of the filter medium 7 is fixed by pressing the laminated body of the filter medium 7 with the nut 18 through the top plate 13. In addition, a screw part may be provided in the positioning rod 19 and a nut may be fitted to this screw part. In such a structure, the rod bolt 17 can be omitted.

  As shown in FIG. 4, a plurality of fixing grooves 7a of the filter medium 7 are provided at unequal intervals in the circumferential direction. Thereby, when the filter media 7 are stacked in an inverted state, the fixing grooves 7a of the upper and lower filter media 7 do not coincide with each other, and the positioning rod 19 cannot be fitted. Work mistakes can be prevented.

  As shown in FIGS. 4 and 5, a plurality of filtration flow path forming grooves 15 of the filter medium 7 are formed at predetermined intervals in the circumferential direction of the filter medium 7.

  The filtration flow path forming groove 15 includes an upstream groove e, a middle flow groove f, and a downstream groove g. The upstream groove e is formed at the same depth over the entire length, and the middle flow groove f has an inclination angle of 0.5 to 5 degrees. The downstream groove g is formed at the same depth over the entire length. Specifically, the length of the upstream groove e is set to 2 mm, the length of the midstream groove f (horizontal direction) is set to 2.5 mm, and the length of the downstream groove g is set to 2.5 mm. The channel width is set to about 1 mm. The width dimension which is the difference between the outer radius and the inner radius of the filter medium 7 is 7 mm, and the thickness d of the filter medium 7 is formed to be 0.2 to 0.4 mm. Such a filter medium 7 is formed by pressing or the like.

  As shown in FIG. 5, the filtration flow path 16 includes an upstream portion E, a middle flow portion F, and a downstream portion G corresponding to the upstream groove e, the middle flow groove f, and the downstream groove g of the filtration flow path forming groove 15. The upstream portion E and the downstream portion G are formed with the same flow path height over the entire length, and the midstream portion F is formed so that the flow path height increases toward the downstream side. Moreover, the corner | angular part of the filter material which forms the inflow port of raw | natural water is not a round but a sharp shape.

(Second Embodiment)
Similar to the first embodiment, the backwashing type filtration apparatus 1 of the present embodiment includes a pressure vessel and a plurality of cylindrical filtration elements, and the shape of the filter medium constituting the filtration element is the same as that of the first embodiment. It is different from the first embodiment, and other constituent elements are the same as those of the first embodiment.

  FIG. 6 is a cross-sectional view showing a part of the filtration element of the backwashing type filtration apparatus according to the second embodiment. As shown in FIG. 6, the filter medium 7 is formed so that the outer thickness is thinner than the inner thickness over the entire circumference. The upper surface of the filter medium 7 is inclined so as to become lower toward the downstream side at a predetermined inclination angle, and a cylindrical spacer 7b that can be easily manufactured and has a large aperture ratio is uniformly formed on the upper surface. A large number are formed at predetermined intervals. Moreover, the lower surface of the filter medium 7 is formed in a smooth horizontal plane.

  Then, by laminating the filter media 7, a filter channel 16 is formed in which the channel height increases toward the downstream side due to the presence of the spacer 7 b of the lower filter media 7.

4). Advantages of the present invention (1) In the present invention, the flow path height outside the inside of the filtration element 6 is configured to be high, so that microorganisms and the like are efficiently captured during filtration to filter raw water. Can be backwashed efficiently during backwashing.

(2) Moreover, the upstream part E is formed in the same small flow path height over the full length among the filtration flow paths 16 of the filtration element 6, and the middle flow part F is such that the flow path height increases toward the downstream side. Since the downstream side is formed so that the flow path height does not become smaller than that of the midstream side, at the time of filtration, microorganisms and the like are captured at the inlet of the upstream portion E having a small flow path height, and raw water is filtered. The pressure loss can be reduced by the presence of the downstream portion G. Then, due to the presence of the midstream portion F, the pressure loss can be gradually and smoothly reduced. For this reason, the throughput of raw | natural water can be improved, performing sufficient filtration smoothly.

(3) At the time of backwashing, the filtered water flowing into the filtration flow path 16 from the outside of the filter element 6 is accelerated in the upstream portion E, and therefore hits microorganisms etc. clogged at the inlet of the upstream portion E. A large impact force can be given to microorganisms and the like. For this reason, microorganisms and the like clogged at the inlet of the upstream portion E can be efficiently removed.

(4) In addition, the inclination angle of the bottom surface of the filtration flow path forming groove 15 corresponding to the midstream portion F needs to be an appropriate angle in order to suppress a loss that is disadvantageous in improving the throughput. In the present invention, since the inclination angle of the bottom surface of the filtration flow path forming groove 15 is 0.5 to 5 degrees which is an appropriate angle, it is possible to suppress a loss that is disadvantageous in improving the throughput. In addition, it is more preferable that the inclination angle of the bottom surface of the filtration flow path forming groove 15 is 0.5 to 2 degrees.

(5) Since the flow path height of the upstream portion E captures microorganisms and the like at the inlet of the upstream portion E, it cannot be made larger than a certain height. In the present invention, the flow path height of the upstream portion E is set to 100 μm or less, so that microorganisms and the like can be captured appropriately. On the other hand, since it is set to 10 μm or more, the inflow of raw water to the upstream portion E is not excessively restricted.

(6) Moreover, since the flow path length of the upstream part E is set to 30% or less with respect to the full length of the filtration flow path, the upstream part E whose flow path height is low compared with the middle flow part F and the downstream part G. Can be sufficiently suppressed. Moreover, since the flow path length of the upstream part E is set to 5% or more with respect to the full length of the filtration flow path 16, there is no trouble in the production of the filtration flow path forming groove 15 and the like.

(7) Since the corner of the filter medium forming the raw water inlet is not a large round but a sharp shape, microorganisms and the like are hardly clogged at the inlet.

  In the above embodiment, for ease of manufacturing, the downstream portion G is formed with the same flow path height over the entire length, but in order to further reduce the loss, the flow path height increases toward the downstream side. You may form so that may become large.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Backwash type filtration apparatus 2 Pressure vessel 3 Raw water inflow port 4 Filtrated water outflow port 5 Partition plate 6 Filtration element 7 Filter material 7a Fixing groove 7b Spacer 8 Backwashing means 9 Motor 10 Opening part 11 Raw water chamber 12 Filtration water chamber 13 Top plate 13a Mounting hole 14 Bottom opening 15 Filtration channel forming groove 16 Filtration channel 17 Rod bolt 18 Nut 19 Positioning rod 20a, 20b Backwash nozzle 21 Backwash tube 21a, 21b Branch tube 22 Rotating shaft E Rotating shaft E Upstream F Middle stream part G Downstream part d Filter material thickness e Upstream groove f Middle stream groove g Downstream groove

Claims (5)

A pressure vessel, and a cylindrical filtration element disposed in the pressure vessel, the raw water is filtered from the inside to the outside of the filtration element and filtered, and the filtered water is allowed to flow backward to filter the filtration element. A backwash type filtration device for cleaning,
The filtration element is configured by laminating a disk-type filter medium in which a filtration channel forming groove is formed in a radial direction, and forming a filtration channel between the upper and lower filter media, and the inside of the pressure vessel A plurality of circumferences are arranged,
The flow path height of the filtration flow path is configured such that the downstream side is higher than the upstream side,
Furthermore, it is configured such that at least one of the filtration elements is connected to a backwash tube for washing the filtration element by flowing the filtered water back to the filtration element.
By rotating the backwash tube and switching the connection with the plurality of filtration elements arranged circumferentially , the filtration element is washed in the filtration element to which the backwash tube is connected, and the backwashing is performed. A back-washing type filtration apparatus configured to filter raw water in a filtration element to which a pipe is not connected.
The filtration flow path includes an upstream portion, a midstream portion, and a downstream portion from the inside of the filtration element, and the upstream portion is formed at the same flow path height over the entire length, and the midstream portion is a flow path toward the downstream side. 2. The backwashing type filtration apparatus according to claim 1, wherein the height is increased and the downstream portion is configured such that the flow path height does not become smaller than that of the midstream portion .
  The backwashing filtration apparatus according to claim 2, wherein an inclination angle of a bottom surface of the filtration flow path forming groove corresponding to the midstream portion is 0.5 to 5 degrees.   The flow path height of the upstream part is 10 to 100 µm, and the flow path length of the upstream part is 5 to 30% or less with respect to the total length of the filtration flow path. Item 4. The backwash type filtration device according to item 3.   The backwashing type filtration apparatus according to any one of claims 2 to 4, wherein the downstream portion is formed at the same flow path height over the entire length.

Images