JP2019025424A - Filter device and cleaning method thereof - Google Patents

Abstract

To provide a filter device and a cleaning method thereof that, in residue removal, allow the residue to be removed quickly and certainly from a coil body.SOLUTION: A filter device 1 to filter a raw liquid through gap parts s formed between neighboring ring parts 10a of a coil body 10 comprises stretching means (a stretching device 40) to cause stretching vibration of the coil body 10 toward the axial direction of the coil body 10. Preferably, the period of the stretching vibration by the stretching means is regular or irregular.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter device and a cleaning method thereof.

  For example, a filtration device using a spring-type filter is known as a device for filtering solid foreign matters. In this filtration apparatus, a filter aid is adhered between adjacent rings of a spring, and a stock solution is passed through the adjacent rings, whereby foreign matters are separated by a spring or a filter aid.

  In such a type of filtration device, the filtration is performed while alternately repeating filtration and washing so that the device can be operated efficiently and continuously. As the cleaning, for example, a technique has been proposed in which a liquid is caused to flow backward when washing a spring or a filter aid, and the filter aid containing foreign matters is removed by the falling force of the liquid that flows backward (for example, , See Patent Document 1).

  According to the technique as described above, since it is not necessary to disassemble the filtration device at the time of cleaning, it is expected that the filter aid and the foreign matter are removed from the coil spring in a relatively short time.

Japanese Patent Laid-Open No. 2001-232111

  However, in the conventional technology as described above, it is not possible to easily remove the filter aid or the filter material depending on the type of foreign matter, and as a result, it takes time for cleaning or causes clogging failure of the filter device. There is.

  The present invention has been made based on the circumstances as described above, and an object of the present invention is to provide a filter device capable of quickly and surely removing the above-mentioned filtered material from the coil body when removing the filtered material, and its It is to provide a cleaning method.

The present invention
(1) A filter device that separates a stock solution contained through a gap formed between adjacent ring portions of a coil body,
A filter device comprising expansion and contraction means for expanding and contracting the coil body in the axial direction of the coil body;
(2) The filter device according to (1), wherein a period of stretching vibration by the stretching means is regular or irregular.
(3) The filter device according to (1) or (2), which includes a particulate filter aid, and the filter aid adheres to the gap, and (4) adjacent ring portions of the coil body. A method for cleaning a filter device for separating a stock solution through a gap formed between
The present invention relates to a cleaning method, characterized in that when removing a filter from the coil body, the coil body is subjected to stretching vibration in an axial direction of the coil body.

  In the present specification, “foreign matter” means an object to be filtered, “raw solution” means a suspension containing foreign matter before filtration, and “filtered matter” is separated by filtration. It means the residue left on the coil body (or on the coil body and the filter aid) later.

  The present invention can provide a filter device and a cleaning method for the filter device that can quickly and reliably remove the filtrate from the coil body when removing the filtrate.

It is a schematic sectional drawing which shows one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the usage method of FIG. 1, Comprising: The state before a precoat is shown. It is a schematic sectional drawing for demonstrating the usage method of FIG. 1, Comprising: The state at the time of a precoat is shown. It is a schematic sectional drawing for demonstrating the usage method of FIG. 1, Comprising: The state after filtration separation and before backwashing is shown. It is a schematic sectional drawing for demonstrating the usage method of FIG. 1, Comprising: The state at the time of backwashing is shown. It is a schematic sectional drawing which shows other embodiment of this invention.

<Filter device>
The filter device of the present invention is a filter device that separates the stock solution through a gap formed between adjacent ring portions of the coil body, and expands and contracts the coil body in the axial direction of the coil body. It is characterized by having expansion and contraction means for vibrating.

  Hereinafter, although one embodiment of the present invention is described with reference to drawings, the present invention is not limited only to the embodiment described in the drawings.

  FIG. 1 is a schematic sectional view showing an embodiment of the present invention. As shown in FIG. 1, the filter device 1 is roughly composed of a coil body 10, a filter aid 20, a rod 30, an expansion / contraction device 40, a case body 50, and a hydraulic pressure gauge 60. Yes.

  The coil body 10 separates the foreign matters by passing a stock solution containing solid foreign matters, for example, through a gap s formed between adjacent ring portions 10a. For example, as shown in FIG. 1, the coil body 10 has a predetermined gap dimension (distance between adjacent ring portions) between adjacent ring portions 10 a due to a protruding spacer 10 b provided on each ring portion 10 a. What was formed so that it may have can be adopted.

  The dimension of the predetermined gap is 0.1 μm to 500 μm, preferably 1 μm to 200 μm in the case of industrial wastewater, and 1 μm to 100 μm in the case where the foreign matter is bacteria such as bacteria.

  The material constituting the coil body 10 is not particularly limited as long as expansion and contraction vibration can be performed, but preferably has elasticity from the viewpoint of sure expansion and contraction. In addition, the material preferably has corrosion resistance from the viewpoint of suppressing corrosion. As such a material, stainless steel is preferable, and SUS316 is more preferable. The above-mentioned “having elasticity” means that the coil body 10 is restored to its original shape by its own elastic force after being stretched or contracted.

  The coil body 10 has an upper end connected to the seal member 11 and a lower end connected to the receiving member 12. The seal member 11 holds the upper end portion of the coil body 10 and fixes it to the case body 50. The receiving member 12 holds the lower end portion of the coil body 10 and fixes it to the rod 30. By the seal member 11, the receiving member 12, and the coil body 10, the inside of the case body 50 includes a space where the undiluted solution before filtration exists (hereinafter also referred to as “space A”) and a filtrate after filtration. It is partitioned into spaces (hereinafter also referred to as “space B”).

  The filter aid 20 is a particulate powder adhering to the gap s. The filter device 1 preferably includes the filter aid 20. The filter aid 20 adheres (deposits) so as to fill the space between the adjacent ring portions 10a in the coil body 10, thereby preventing the passage of foreign matters while allowing the filtrate to pass through the gap portion s. And filter.

  The particle size of the filter aid 20 is usually 1 μm to 1 mm, although it depends on the size of the gap and the shape of the foreign matter, and when the foreign matter is bacteria such as bacteria, it is 1 μm to 200 μm. Is preferred. Further, it is desirable that the particle diameters are not uniform and vary. Note that when the filter aid 20 is used, the size of the gap need not be smaller than the diameter of the foreign matter.

  The material constituting the filter aid 20 is not particularly limited as long as it can filter out foreign substances, but is preferably diatomaceous earth, cellulose, or pearlite from the viewpoint of ease of regeneration and reduction of material costs.

  As described above, the filter device 1 includes the filter aid 20, so that foreign substances can be more reliably separated by filtration, and when the filtrate is removed, the filtrate and the filter aid 20 are removed. It can be easily removed from the coil body 10.

  The rod 30 connects the receiving member 12 and a telescopic device 40 described later. Specifically, the rod 30 penetrates the inside of the coil body 10, the lower end is fixed to the receiving member 12, and the upper end is connected to a telescopic device 40 described later.

  The expansion device 40 is for expanding and contracting the coil body 10 in the axial direction of the coil body 10 and is used as expansion and contraction means. Specifically, the lower end portion of the expansion / contraction device 40 and the upper end portion of the rod 30 are connected, and when the expansion / contraction device 40 is operated, the rod 30 vibrates in the axial direction and the coil body 10 expands / contracts in the vertical direction. . As the expansion / contraction device 40, for example, an expansion / contraction mechanism such as a cam structure (not shown) can be employed.

  Here, the period of the stretching vibration of the coil body 10 by the above-described stretching device 40 can be either regular or irregular. As a regular thing, the period of 0.5 Hz-50 Hz etc. are employ | adopted, for example. Thereby, when removing the filter cake, the filter cake can be removed from the coil body 10 quickly and reliably. The regular or irregular stretching vibration includes a single vibration of only one period.

  The case body 50 houses the coil body 10 therein, and holds the coil body 10 via the seal member 11. The case body 50 includes an opening 51 that communicates with the space A and receives the stock solution from the outside, an opening 53 that communicates with the space A and discharges the filter aid 20 and the like to the outside, and communicates with the space B and filtrates outside. Are provided. The upper end portion of the rod 30 described above is led out to the outside through the opening 52 of the case body 50.

  The hydraulic pressure gauge 60 measures the pressure of the stock solution in the space A. The pressure of the stock solution measured by the hydraulic pressure gauge 60 is used for determining whether or not the filter device 1 is to be cleaned, for example. As the hydraulic pressure gauge 60, for example, a known one such as an analog output gauge pressure gauge can be adopted.

  Next, an example of how to use the filter device 1 will be described. In the said filter apparatus 1, after performing [1]-[3] shown below sequentially, it repeats from [1] again, and performs continuous filtration.

[1] A filter aid 20 is attached to the outer periphery of the coil body 10 before filtration (see FIG. 2A) (hereinafter also referred to as “precoat”). Specifically, as shown in FIG. 2B, the filter aid 20 (hatched circle in FIG. 2B) covers at least the gap s formed between the adjacent ring portions 10a of the coil body 10. Adhere to.

[2] After the filter aid 20 is attached to the coil body 10 in [1] above, a stock solution (for example, polluted water) is pumped into the space A of the case body 50 through the opening 51 and filtered. Do another. At this time, the undiluted solution passes through the gap s and is guided to the space B inside the coil body 10, and as shown in FIG. 2C, foreign substances (black circles in FIG. 2C) are present during the passage. By being trapped in the filter aid 20 and / or the gap s, only the filtrate flows into the space B, and the filtrate is sent out of the case body 50 through the opening 52.

[3] After the separation in [2] above, air is pumped into the space B of the case body 50 through the opening 52 while the coil body 10 is stretched and oscillated using the stretching device 40. As shown in 2D, the filter device 1 is cleaned (also referred to as “backwashing”). The backwashing of the filter device 1 will be described in detail in the section <Filter device cleaning method> below.

  Here, the time of transition from [2] to [3] is not particularly limited. For example, when the pressure measured by the hydrometer 60 exceeds a predetermined value, the transparency of the filtrate is lower than the predetermined value. A time point, a time point when the flow rate of the filtrate becomes lower than a predetermined value, or the like can be adopted.

  As described above, since the filter device 1 has the above-described configuration, the coil body 10 can be expanded and contracted by the expansion and contraction device 40 when removing the filter material, and the filter can quickly and reliably coil the filter material. It can be removed from the body 10.

<Cleaning method for filter device>
The cleaning method of the present invention is a method of cleaning a filter device that filters a stock solution through a gap formed between adjacent ring portions of a coil body, and removes the filtered material from the coil body (back washing). In this case, the coil body is stretched and contracted in the axial direction of the coil body. Hereinafter, an embodiment of the cleaning method will be described with an example of cleaning using the filter device 1 described above.

  In the cleaning method for the filter device 1 (backwashing in the above [3]), [3-1] to [3-3] shown below are sequentially executed.

[3-1] A valve (not shown) outside the case body 50 that communicates with the opening 52 of the filter device 1 is switched to a state in which air can be introduced into the space B through the opening 52, and the opening A valve (not shown) outside the case body 50 that communicates with 53 is opened and a valve (not shown) outside the case body 50 that communicates with the opening 51 is closed.

[3-2] Using the expansion / contraction device 40, air is pumped into the space B of the case body 50 through the opening 52 while the coil body 10 is expanded and contracted in the axial direction of the coil body 10. At this time, the filtrate remaining in the space B due to the pressure of air is pushed out to the space A through the gap portion s of the coil body 10, and as shown in FIG. 2D, the filtrate adheres due to the force of the pushed out filtrate. The filter aid 20 is detached from the coil body 10 and discharged to the outside of the case body 50 through the opening 53. Note that the pressure and flow rate of air can be determined as appropriate. Moreover, a well-known technique can be used for the pumping of air.

[3-3] After the filter aid 20 to which the filtrate is attached is removed from the coil body 10, the valve is switched so that the filtrate can be sent from the space B to the outside of the case body 50 through the opening 52. At the same time, the opening 53 is closed and the opening 51 is opened. By executing [3-3], the backwashing of [3] is completed.

  As described above, since the cleaning method for the filter device 1 has the above-described configuration, the filter material can be quickly and reliably removed from the coil body 10 when the filter material is removed.

  In addition, this invention is not limited to the structure of embodiment mentioned above, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included. Is done.

  For example, in the above-described embodiment, the filter device 1 in which the filter aid 20 is attached to the gap s of the coil body 10 has been described. However, the filter device 2 that does not use the filter aid 20 as shown in FIG. Within the intended scope of the invention. In the filter device 2 shown in FIG. 3, the separation is performed by the adjacent ring portions 10 a of the coil body 10 capturing foreign matter.

  In the above-described embodiment, the filter device 1 that maintains the gap portion s at a predetermined gap size by the protruding spacer 10b provided on each ring portion 10a of the coil body 10 has been described. It may be a filter device (not shown) using a spacer, or a filter device (not shown) that maintains a gap without providing a spacer.

DESCRIPTION OF SYMBOLS 1, 2 Filter apparatus 10 Coil body 10a Ring part 20 Filtration aid 30 Rod 40 Expansion / contraction apparatus 50 Case body s Gap part

Claims (4)

A filter device for separating a stock solution through a gap formed between adjacent ring portions of a coil body,
A filter device comprising: expansion and contraction means for expanding and contracting the coil body in the axial direction of the coil body.   The filter device according to claim 1, wherein a period of stretching vibration by the stretching means is regular or irregular.   The filter device according to claim 1, further comprising a particulate filter aid, wherein the filter aid is attached to the gap portion. A cleaning method for a filter device for separating a stock solution through a gap formed between adjacent ring portions of a coil body,
A cleaning method, wherein when removing a filter from the coil body, the coil body is caused to expand and contract in an axial direction of the coil body.

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