JP6856222B2 - strainer - Google Patents

Description

The present invention relates to a strainer attached to a pipeline of clean water or the like and provided with a mechanism for removing foreign matter adhering to a filtration member.

Foreign substances in pipelines that flow water such as clean water, agricultural water, and industrial water are dead leaves, dead branches, small fish, shellfish, algae, vinyl bags, earth and sand, depending on the type of water, the type of piping, the form of the inflow port, etc. , Rust, etc. These foreign substances cause clogging of the pipeline and hinder stable water supply such as a decrease in water supply capacity and a failure of piping equipment. For this reason, a strainer is installed in the middle of this type of pipeline.
This strainer needs to remove foreign matter adhering to the filtration member on a regular basis or depending on the state of clogging of the filtration member in order to prevent troubles due to clogging of the filtration member. However, in order to remove the filtration member from the strainer and clean it, the pipeline is cut off and disassembled, and the work is very troublesome, and the fluid cannot flow to the downstream side of the strainer during the work. Therefore, there is a strainer having a self-cleaning function for removing foreign substances that have been captured and accumulated.

In a strainer having a self-cleaning function and provided with a cylindrical filtration member in a casing, the strainer extends in the axial direction in a state of being close to or in sliding contact with an inner surface or an outer surface of the filtration member with a rotating shaft arranged concentrically with the filtration member. Some have a scraper attached. By rotating the rotating shaft by a motor or human power, foreign matter adhering to the filtration member is scraped off by a scraper without removing the filtration member, and the foreign matter is dropped and deposited in the storage portion under the casing. This scraper opens a valve attached to a foreign matter discharge port of a casing so that foreign matter that has been scraped off and accumulated can be discharged to the outside together with running water (see Patent Document 1, FIG. 1 and the like).

Japanese Unexamined Patent Publication No. 2016-079986 Jitsufuku No. 03-26890

In a strainer having a self-cleaning function having the above scraper, if the foreign matter discharge (valve opening) work is not performed for a long period of time, the foreign matter becomes compacted due to the accumulation weight of the foreign matter, and even if the discharge valve is opened, the compacted foreign matter is discharged. It may not be possible to discharge due to clogging in the reduced part of the route. In this case, it is necessary to cut off the water in the pipeline and decompose it to remove the accumulated foreign matter.

An object of the present invention is to make it possible to smoothly discharge the compacted foreign matter from the discharge valve as the water flows.

In order to achieve the above object, the present invention agitates the consolidated foreign matter to form a water supply (mizumichi) so that the water supply is allowed to flow to the discharge valve, and the water is agitated along with the discharged water. Therefore, the deposited foreign matter with weakened consolidation strength was discharged.

Specifically, first, it is a strainer that filters the foreign matter from running water containing foreign matter such as dead leaves, dead branches, small fish, shellfish, algae, vinyl bags, earth and sand, and rust. This type of foreign matter is relatively large and often has a size of several millimeters or more, and water containing this foreign matter is unsuitable for clean water, agricultural water, industrial water, and the like.
Next, a casing having an inflow port and an outflow port, and a vertically placed cylindrical filter provided in the casing so as to filter the flowing water from the inflow port to the outflow port across the space between the inflow port and the outflow port. A member, a rotating shaft arranged inside the filtration member with its upper end protruding from the casing, and a scraper integrally provided on the rotating shaft and facing the inner surface of the filtration member. The lower part of the casing is funnel-shaped, and the funnel-shaped portion forms a storage portion for the filtered foreign matter. The storage portion is provided with a discharge valve for discharging the foreign matter at the lower end, and is described above. A foreign matter agitator is provided, and the agitator adopts a structure of a strainer that can be rotated by a rotation axis different from the rotation axis of the scraper.
The reason why the scraper and the stirrer can be rotated separately is that the frequency of removing foreign matter trapped in the filtration member by the scraper and the frequency of discharging foreign matter accumulated in the storage part are extremely high in the former, and they operate when necessary. This is because there is a lot of waste of power to operate together.

The rotating shaft of the stirring body may be located at any position in the casing as long as the stirring body can be rotated. For example, the rotating shaft of the stirring body can rotate around the axis of the rotating shaft of the scraper. A penetrating configuration can be adopted. With this configuration, the rotation axes have the same axis, the configuration is simple, and it is advantageous in terms of space.
Further, the agitator may have any configuration as long as it can agitate the deposited foreign matter, and for example, a configuration consisting of a stirring rods radially protruding around the rotation axis can be adopted. The structure of this stirring rod is the simplest and cheapest.

In Patent Document 2, in a filtration concentrator, a cylindrical filter is provided in a tubular container (casing), and the filtered material on the peripheral surface of the filter is scraped off by a scraper and dropped into a storage chamber under the casing. , A technique for stirring the dropped filtrate is disclosed.
Since this technique involves a concentrator, the stir bar of this technique is attached to the rotating shaft of the scraper and rotates with the scraper to crush the fragmented cake and make the concentration of the suspension uniform. Therefore, the consolidation sediment is not agitated to form a water supply, and the consolidation sediment is not discharged with running water.

According to the present invention, the deposited foreign matter is agitated to form a water supply, and the water is allowed to flow to the discharge valve, and the deposited foreign matter is discharged along with the discharged flowing water. Therefore, the foreign matter discharge work is not performed for a long period of time, and even if a large amount of foreign matter accumulates and becomes a compacted state, the deposited foreign matter can be smoothly discharged. As a result, the chances of disassembling and cleaning the strainer are greatly reduced, which leads to a reduction in the labor of the operator.

An embodiment of a strainer according to the present invention is shown, (a) is a schematic front sectional view, and (b) is a perspective view of the stirrer. Schematic front sectional view of the operation explanation of the same embodiment Schematic front sectional view of the operation explanation of the same embodiment Schematic front sectional view of the operation explanation of the same embodiment Schematic front sectional view of the operation explanation of the same embodiment

The outline of one embodiment of the strainer according to the present invention is shown in FIG. 1, and the operation thereof is shown in FIGS. 2 to 5. The strainer 10 of this embodiment is interposed in a pipeline P for flowing water such as tap water, agricultural water, and industrial water, and dead leaves, dead branches, small fish, shellfish, and algae are provided in the running water a of the pipeline P. , Vinyl bags, earth and sand, rust, and other various foreign substances b are mixed.

As shown in FIG. 1, the strainer 10 is provided from a casing 11 interposed in the middle of the pipeline P, a cylindrical net cage 12 which is a filtration member vertically placed in the casing 11, and a casing 11. A hollow first rotating shaft 13 passed through the center of the net cage 12 with the upper end protruding, and two circles vertically attached to the outer periphery of the lower end side of the rotating shaft 13 with a plurality of spokes 14. It has an annular scraper 15a and 15b, a second rotating shaft 16 rotatably inserted into the rotating shaft 13, and a stirring body 17 provided below the rotating shaft 16.
The first rotating shaft 13 has a handle 18 at its upper end, and by turning the handle 18, the scrapers 15a and 15b are rotated via the rotating shaft 13.

The casing 11 has an inflow port 11a formed on one end side (left side in FIG. 1) and an outflow port 11b formed on the other end side (right side in FIG. 1). Further, the lower part of the casing 11 is a funnel-shaped foreign matter storage portion 20, and a discharge valve 21 is provided at the lower end of the foreign matter storage portion 20. As the discharge valve 21, a ball valve is used in this embodiment, but various valves having other configurations such as a butterfly valve may be adopted as long as there is no problem.
The funnel shape of the foreign matter storage portion 20 is not limited to the truncated cone shape, and may be any shape as long as the cross section is gradually reduced in the shape of a truncated cone such as a quadrangular pyramid.

An annular partition piece 11e is formed on the inner surface of the central portion of the casing 11 so as to project so as to be in close contact with the outer periphery of the upper end side opening of the net cage 12, whereby the space inside the casing 11 is formed on the upstream side and the downstream side. It is partitioned on the side. Therefore, the water a that has flowed into the casing 11 from the inflow port 11a enters the net cage 12, is filtered by the net cage 12, and then flows out from the outlet 11b. Due to the filtration, foreign matter b adheres to the inner surface of the net cage 12 or falls downward (see FIGS. 2 to 5).

The net cage 12 is arranged in the central portion of the casing 11 in a posture in which the upper end edge thereof is formed obliquely with respect to the axial direction and one end side of the casing 11 is lowered, and the inlet 11a to the outlet 11b of the casing 11 are arranged. Located in the middle, the water a flows while being filtered. The lower end edge of the net cage 12 is fixed to the inner surface of the casing 11 via an annular mesh cage mounting member 12a.

The surface of both scrapers 15a and 15b facing the inner surface of the net cage 12 is a cleaning surface made of a brush such as rubber or resin. Of the two annular scrapers 15a and 15b, the lower scraper 15b is located concentrically with the net cage 12 (and the rotating shaft 13), and the upper scraper 15a is slanted at the upper and lower edges of the mesh cage 12. It is located so as to reach. Therefore, the upper scraper 15a rotates as shown in the solid line → chain line → solid line in FIG. 1, and the cleaning surface on the periphery thereof slides over the entire inner peripheral surface of the net cage 12, and foreign matter adhered to the inner surface. b is stripped (scraped), and the stripped foreign matter b falls into the storage unit 20 and accumulates.

The stirring body 17 is composed of stirring rods 17a protruding radially in four steps in the vertical direction below the second rotating shaft 16. The number of stages and the number of the stirring rods 17a are arbitrary, and the configuration is arbitrary as long as the following deposited foreign matter b can be agitated to form a water supply (mizumichi).
The upper end of the second rotating shaft 16 having the stirring body 17 has a prismatic shape, and a rod-shaped tool having an engaging hole for fitting the prismatic columnar portion 16a can be fitted into the prismatic columnar portion 16a. Therefore, by fitting the tool into the prismatic portion 16a and rotating the second rotating shaft 16, the stirring body 17 rotates as shown by the arrow in FIG. 1 (b).

The strainer 10 has the above configuration, and during normal operation, as shown by the arrow in FIG. 2, the fluid (water a) flowing from the upstream side of the pipeline P to the inflow port 11a of the casing 11 is the fluid (water a) of the casing 11. When entering the inside of the net cage 12 at the center and passing through the net cage 12 from the inside to the outside, the foreign matter b is removed, and the foreign matter b is removed from the outside of the net cage 12 through the outlet 11b of the casing 11 and downstream of the pipeline P. It flows to the side. At this time, the foreign matter b trapped in the net cage 12 naturally falls into the storage portion 20, or is stripped from the inner surface of the net cage 12 to the storage portion 20 by moving the scrapers 15a and 15b.
When a large amount of foreign matter b is accumulated in the storage portion 20, the discharge valve 21 is appropriately opened, and the foreign matter b is discharged along with the flowing water a'due to the opening.

However, when the amount of foreign matter b in the storage portion 20 increases without performing the discharge action, the deposited layer becomes compacted due to its own weight or the like, and the foreign matter b becomes the reduced diameter discharge port 20a of the storage portion 20. It will be clogged in the vicinity. Therefore, even if the discharge valve 21 is opened (even if it is opened), it may not be discharged through the discharge valve 21. This can be known from the fact that the foreign matter b is not discharged even if the discharge valve 21 is opened.

In this case, as shown in FIG. 4, when the second rotating shaft 16 is rotated to rotate the stirring body 17, water supply (mizumichi) c is formed in the layer of the foreign matter b that has been consolidated and deposited. When the water supply c is formed, it is drained through the water supply c by water pressure as shown in FIG. Then, the foreign matter b is also discharged along with the drainage a', and the accumulation of the foreign matter b in the storage unit 20 is eliminated, and the state shown in FIG. 1 is obtained. In this state, the discharge valve 21 is closed and the normal operation is restored.
After that, the foreign matter b is appropriately discharged in the same manner.

In the strainer 10 of the above embodiment, both rotating shafts 13 and 16 are manually rotated, but both rotating shafts 13 and 16 may be rotated by an electric motor. At this time, one of the rotating shafts 13 or 16 may be manually operated. When the electric rotation shafts 13 and 16 are used, they can be rotated at regular intervals or arbitrarily by a timer. Further, when the discharge valve 21 is opened, the sensor detects whether or not the foreign matter b is discharged, and the second rotating shaft 16 can be rotated for a certain period of time by the detection signal that is not discharged.
Further, in this embodiment, the backwash function of various net cages 12 as described in Patent Document 1 can be added.

In the above-described embodiment, the annular scrapers 15a and 15b attached vertically to the first rotating shaft 13 with the spokes 14 are used, but the scraper is a disk-shaped scraper attached directly to the rotating shaft 13. , A discharge flow path may be formed inside the discharge flow path.
Further, as the net cage 12 as the filtration member, a general one having both both end edges orthogonal to the axial direction can be used instead of the one of the embodiment in which the upper end edge is formed obliquely with respect to the axial direction. In that case, the scraper is made to slide over the entire inner surface of the net cage 12 as an object over the entire axial length of the tubular net cage 12.

Thus, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

10 Strainer 11 Casing 11a Inflow port 11b Outlet 12 Net cage (filtration member)
13 First rotation axis (scraper rotation axis)
14 Scraper spokes 15a, 15b Scraper 16 Second rotation axis (rotation axis of agitator)
17 Stirrer 17a Stirrer rod 20 Foreign matter storage 21 Discharge valve P Pipeline a Running water a'Discharge running water b Foreign matter c Water supply (Mizumichi)

Claims (2)

A strainer (10) that filters the foreign matter (b) from running water containing the foreign matter (b) such as dead leaves, dead branches, small fish, shellfish, algae, vinyl bags, earth and sand, and rust.
A casing (11) having an inflow port (11a) and an outflow port (11b), and a flow from the inflow port (11a) across the space between the inflow port (11a) and the outflow port (11b) in the casing (11). A vertically placed cylindrical filtration member (12) provided to filter the flowing water (a) toward the outlet (11b), and a filtration member (12) with the upper end protruding from the casing (11). A rotating shaft (13) arranged inside and scrapers (15a, 15b) integrally provided on the rotating shaft (13) and facing the inner surface of the filtration member (12) are provided.
The lower part of the casing (11) has a funnel shape, and a storage portion (20) for the filtered foreign matter (b) is formed in the funnel-shaped portion, and the storage portion (20) has the foreign matter at the lower end. with (b) the discharge valve for discharging (21) is attached, stirrer (17) is provided in the foreign substance (b), the agitator (17), the rotation axis of the front Symbol scraper ( the 13) is rotatable by another rotation shaft (16), consisting of a stirring rod which projects radially around its axis of rotation (16) (17a) strainer. The strainer according to claim 1, wherein the rotating shaft (16) of the stirring body (17) rotatably penetrates the axis of the rotating shaft (13) of the scraper.

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