KR102526834B1 - Screen device - Google Patents

Abstract

Disclosed is a screen device (1) comprising: two cylindrical punched metals (2A, 2B) having a plurality of holes (h); two coil springs (3A, 3B) in which wire (6) is spirally wound up on the external side of each of the two punching metals (2A, 2B); two external cases (4A, 4B); two driving units (5A, 5B); and a control unit (20) controlling the two driving units (5A, 5B). The liquid to be treated (W1) is supplied to one of the two punching metals (2A, 2B) and the other one thereof is connected to the downstream of the liquid to be treated (W1) in the flow direction and has a smaller inner diameter than the one thereof. The control device (20) controls the two driving units (5A, 5B) when the wire (6) is clogged such that impurities in each of the two coil springs (3A, 3B) can be cut out.

Description

Screen device {SCREEN DEVICE}

The present invention relates to a screen device for separating a permeate from sludge (liquid to be treated) such as excreta and concentrating the liquid to be treated.

For example, in sludge treatment in a sewage treatment plant, a screen device using a coil spring as a screen is used in order to separate impurities contained in a liquid to be treated. For example, Patent Literature 1 discloses a screen device that, when a gap between coil springs is clogged with impurities, removes the clogging by controlling the ends of acute-angled coil springs to come into contact with each other to cut the impurities. .

Further, Patent Literature 2 discloses a cross-flow filtration device in which a rotating shaft provided with a large number of concave pieces is disposed inside a filter body as a screen device for eliminating clogging. In the screen device disclosed in Patent Literature 2, when the liquid to be treated rotates the rotary drive blade, the rotary shaft rotates, and the concavity in contact with the filtering element eliminates clogging. In addition to this, according to Patent Literature 2, since the rotary shaft equipped with a large number of indentations is disposed inside the filter element, the cross-sectional area of the filter element through which the liquid to be treated passes is reduced, and the blood contacting the filter element is reduced. Since the flow rate of the treatment liquid is increased, it is said that the filtration efficiency is improved.

Japanese Patent Publication No. 6458962 Japanese Unexamined Patent Publication No. 10-272309

By the way, the screen device disclosed in Patent Literature 1 has a simple and inexpensive structure, but basically assumes a vertical arrangement, so when installed horizontally, the cylinder formed by the coil spring bends into a half-moon shape. The width (eye width) of (gap of the coil spring, which is a filter element) is not uniform, which may cause a problem with the function of the screen. In addition, in the screen device disclosed in Patent Literature 1, when installed horizontally, when the permeate flows out from the eyes, the flow rate near the coil spring is slowed. The liquid to be treated flowing through the liquid passes through without contacting the filtering element, and the filtration efficiency (or the efficiency of concentration of the liquid to be treated) may decrease. Therefore, it is conceivable to adopt the technique of Known Document 2 capable of increasing the flow rate of the liquid to be treated in contact with the filtering element, but the structure of a rotating shaft equipped with a large number of indentations is complicated and expensive.

Accordingly, an object of the present invention is to provide a screen device that has a uniform opening width even when installed horizontally, increases the flow rate of the liquid to be treated in contact with the filtering element, and can be manufactured at low cost.

The screen device of the present invention comprises: a cylindrical first punching metal having a plurality of holes and through which a liquid to be treated is supplied; a first coil spring in which wire is spirally wound around the outside of the first punching metal; A first outer cylinder covering the first coil spring from the outside at a distance from the coil spring, connected to a downstream side of the flow direction of the liquid to be treated from the first punching metal, a plurality of holes are formed, and the first A cylindrical second punching metal having a smaller inner diameter than the punching metal, a second coil spring in which a wire rod is spirally wound outside the second punching metal, and a second coil spring spaced apart from the second coil spring from the outside A second outer cylinder for covering, a first drive device for extending and contracting the first coil spring, a second drive device for extending and contracting the second coil spring, and a control device for controlling the first drive device and the second drive device. have The first coil spring and the second coil spring include a first surface that is the spiral cylindrical surface and a second surface that is a spiral inclined surface having an acute angle with the first surface, and the control device, When an impurity is clogged between the wire rods, the first coil spring is controlled by the ridge of the wire rod forming the edge shape of the first surface and the second surface by controlling the first driving device and the second driving device. and in each of the second coil spring, the impurity is cut.

According to the present invention, even when installed horizontally, it is possible to provide a screen device that has a uniform opening width, increases the flow rate of the liquid to be treated in contact with the filtering element, and can be manufactured at low cost.

1 is a partial sectional side view of a screen device according to an embodiment.
FIG. 2 is an enlarged view of a portion X of FIG. 1 , in which (a) is a diagram for explaining a state in which the coil spring is extended, and (b) is a diagram for explaining a state in which the coil spring is compressed.
Fig. 3 is a cross-sectional view seen in the direction of arrows YY in Fig. 1;
Fig. 4 is a partial cross-sectional perspective view of a punching metal and a coil spring included in a screen device of a modified example.
Fig. 5 is a partial cross-sectional perspective view of a punching metal and a coil spring included in a screen device of another modified example.

Hereinafter, a screen device according to an embodiment will be described with reference to the drawings. The configurations and the like shown below are merely examples, and there is no intention to exclude the application of various modifications or techniques that are not specified. The configurations and the like shown below can be variously modified and implemented without departing from the essential configuration requirements and the meaning of the present invention.

[One. composition]

1 is a diagram for explaining a screen device 1 as an embodiment. The screening device 1 is a device that can be installed horizontally, and sludge, excreta, or a mixture thereof (hereinafter, collectively referred to as “liquid to be treated W1”) is separated from permeate PW and impurities. It is separated into a concentrate (W2) containing (T).

The term &quot;horizontal arrangement&quot; herein includes not only a direction in which the axis L of the screen device 1 (described later) coincides with the horizontal direction, but also an inclined direction. For example, in view of the flow of the liquid W1 to be treated, the angle α of the axis L with respect to the horizontal direction is set within the range of 0°≤α<75° so that the upstream is higher than the downstream. In , it is called "horizontal layout". In addition, "the angle β of the axis L with respect to the horizontal direction is set within the range of 75° ≤ β ≤ 90°" is referred to herein as "vertical arrangement".

The screen device 1 may be installed in a "vertical arrangement" or a "horizontal arrangement", and is a device capable of appropriately performing solid-liquid separation or concentration.

The screen device 1 removes the permeated liquid PW and contaminants from the liquid to be treated W1 flowing inside a cylindrical screen (filter body) formed of a punching metal 2 and a coil spring 3 described later. It is separated into a concentrate (W2) containing (T). By controlling the eye size (eye width) of the coil spring 3, solid-liquid separation and classification according to the purpose can be performed.

In addition, the screen device 1 has a function of cutting the impurity T and eliminating the clogging by controlling the size (eye width) of the eye of the coil spring 3 to become small when the screen is clogged.

Hereinafter, the configuration of the screen device 1 will be described in detail.

The screen device 1 includes a cylindrical punching metal 2 in which a plurality of holes h are formed, concentric with the punching metal 2 and disposed outside the punching metal 2 in the radial direction, and the punching metal 2 ) A unit provided with a coil spring 3 covering the portion where the hole h is formed, an outer cylinder 4 covering the coil spring 3 from the outside, and a driving device 5 that expands and contracts the coil spring 3 (10) has at least two. As shown in FIG. 3 described later, one unit has three drive devices 5, but in FIG. 1, only one drive device 5 is shown for one unit for the sake of drawing simplification.

In this embodiment, the horizontally arranged screen device 1 provided with three units 10 is exemplified, but the number of units 10 may be two or four or more. In addition, the screen device 1 has a control device 20 that controls the drive device 5 of each unit 10 .

The outer diameter of the punching metal 2 included in one unit 10 and the inner diameter of the coil spring 3 are substantially the same, but the inner diameter of the coil spring 3 is slightly larger than the outer diameter of the punching metal 2. .

The three units 10 are arranged in series along the flow direction of the liquid W1 to be treated. Hereinafter, when distinguishing the three units 10, they are called a 1st unit 10A, a 2nd unit 10B, and a 3rd unit 10C in order from the upstream side of a flow direction. In addition, when distinguishing the punching metal 2, coil spring 3, outer cylinder 4, and driving device 5 included in each of the three units 10, each element 2 to 5 are provided According to the unit 10 that does (in order from the upstream side), "1st" to "3rd" are appended to the beginning of the element name, and A to C are added to the end of the code.

All three punching metals 2 included in each of the three units 10 have a cylindrical shape, but have different inner diameters. The three punching metals 2 are arranged in series, but the inner diameter of the punching metal 2 arranged upstream is larger than the inner diameter of the punching metal 2 arranged downstream when viewed from the flow of the liquid to be treated. do. In other words, the inner diameter of the punching metal 2 arranged downstream is smaller than the inner diameter of the punching metal 2 arranged upstream in terms of the flow of the liquid to be treated.

The three punching metals 2 are arranged coaxially and in series so that all central axes coincide with the axis L and are in a straight line. The target liquid W1 is supplied inside the first punching metal 2A located at the most upstream side.

Adjacent punching metals 2 are connected to each other by a truncated cone-shaped connecting pipe 12A or 12B whose inner diameter decreases from upstream to downstream when viewed from the flow of the liquid to be treated.

Specifically, the downstream end of the first punching metal 2A and the upstream end of the second punching metal 2B are connected by the first connecting pipe 12A, and the downstream end of the second punching metal 2B and the third punching The upstream end of the metal 2C is connected by a second connecting pipe 12B.

Further, the upstream end of the first punching metal 2A is fixed to the inlet pipe 11 through which the target liquid W1 is introduced into the screen device 1, and the downstream end of the third punching metal 2C is It is fixed to the outlet pipe 13 through which the concentrated liquid W2 separated from the liquid W1 to be treated is discharged. The inlet pipe 11, the first connecting pipe 12A, the second connecting pipe 12B, and the outlet pipe 13 all have a cylindrical shape through which the liquid W1 to be treated can flow, and the punching metal 2 It is disposed approximately concentric with the axis (L) of.

In addition, on the outer surface on the upstream side of the first connecting pipe 12A, the second connecting pipe 12B, and the outlet pipe 13, a flange portion projecting radially from the outer surface and having a circular shape around the axis L ( 17) is placed and also fixed.

As will be described later, the controller 20 can expand and contract the coil spring 3, but the inlet pipe 11, the first punching metal 2A, the first connection pipe 12A, and the second punching metal 2B ), the second connection pipe 12B, the third punching metal 2C, and the outlet pipe 13 are all of a constant length, so regardless of the expansion and contraction state of the coil spring 3, the inlet pipe The length from 11 to the outlet pipe 13 does not change.

As shown in Fig. 2 (a), the diameters of the plurality of holes h formed in each punching metal 2 are set larger than the eye of the coil spring 3 disposed outside each punching metal 2 do. The size of the eye of the coil spring 3 is set to a size that basically does not allow the impurity T to pass through.

Therefore, the screen device 1 transmits the permeated liquid from the inside to the outside of the cylindrical punched metal 2 and the coil spring 3 in the radial direction from the liquid to be treated W1 flowing through the inside of the punched metal 2. (PW) is separated, and the permeated liquid (PW) is removed and concentrated from the liquid to be treated (W1), and the concentrated liquid (W2) containing impurities (T) is discharged in the direction of the axis (L).

As described above, the three punching metals 2 are set to have smaller inner diameters as they are located downstream. That is, as shown in Fig. 1, the inner diameter D2 of the second punching metal 2B is set smaller than the inner diameter D1 of the first punching metal 2A, and the inner diameter D3 of the third punching metal 2C ) is set smaller than the inner diameter D2 of the second punching metal 2B. That is, there is a relationship of D1 > D2 > D3.

The target liquid W1 introduced from the inlet pipe 11 is supplied to the inside of the first punching metal 2A. Thereafter, the liquid to be processed W1 passes through the first punching metal 2A, the first connecting pipe 12A, the second punching metal 2B, the second connecting pipe 12B, and the third punching metal 2C. The permeated liquid PW is separated in each unit 10 while sequentially flowing through the inside of the , and discharged from the outlet pipe 13 as concentrated liquid W2. 1 and 2, the permeate PW is indicated by an empty arrow.

The coil springs 3 included in each of the three units 10 are all constituted by a wire 6 wound in a spiral shape so as to be substantially concentric with the axis line L. The inner diameter of the coil spring 3 included in one unit is substantially the same as the outer diameter of the punching metal 2 disposed inside the coil spring 3 and is slightly larger than the outer diameter.

In addition, the thickness, cross-sectional shape, etc. of the wire rod 6 constituting the coil spring 3 of each unit 10 are not necessarily the same in all the units 10.

As shown in FIG. 2, each coil spring 3 formed by winding a wire rod 6 has a first surface 61, which is a spiral-shaped cylindrical surface, and an angle θ formed with the first surface 61 is an acute angle. and a second surface 62 which is a spiral-shaped inclined surface.

Here, as shown in FIGS. 2(a) and (b), a triangular cross section is formed by a first surface 61 facing radially inward and a pair of second surfaces 62 facing radially outward. The wire rod 6 having is exemplified. The angle θ formed by the first surface 61 and the second surface 62 is preferably 30° to 70°, but is not limited to this as long as it is an acute angle.

The first surfaces 61 of the wire rods 6 adjacent to each other in the direction of the axis L (the flow direction of the liquid W1 to be treated) are formed to be the inner walls of cylinders having the same inner diameter as each other. The second surfaces 62 are formed to be spaced apart from each other as the respective second surfaces 62 of the wire rods 6 adjacent in the axial line L direction face outward in the radial direction.

Adjacent wire rods 6 come close to each other or are separated from each other according to the expansion and contraction of the coil spring 3 in the direction of the axis line L. 2(a) is a cross-sectional view of the wire 6 when the coil spring 3 is extended by the control device 20, and FIG. 2(b) is a cross-sectional view of the coil spring 3 by the control device 20 ) is a cross-sectional view of the wire rod 6 when compressed.

As shown in Fig. 2(a), when the coil spring 3 is extended, the wire rods 6 adjacent to each other in the direction of the axis line L are separated from each other, and a gap G is formed therebetween. The impurity T contained in the liquid W1 to be treated is basically designed so that it cannot pass through the gap G of the coil spring 3, but the permeated liquid PW containing no impurity T, or , the permeate PW containing only small impurities T passing through the gap G flows outward from the gap G between the wire rods 6 in the radial direction of the coil spring 3 .

On the other hand, when some large impurities T are caught in the gap G of the coil spring 3 and cause clogging, as shown in FIG. 2(b), the coil spring ( 3) is compressed, and the ridge line R between the first surface 61 and the second surface 62 makes line contact with the adjacent wire rods 6. As a result, the impurity T, which is the cause of the clogging, is cut by the two ridge lines R in line contact with each other, and the clogging is eliminated.

As shown in Fig. 1, the upstream end of the first coil spring 3A is fixed to the inlet pipe 11, the upstream end of the second coil spring 3B is fixed to the first connection pipe 12A, The upstream end of the three-coil spring 3C is fixed to the second connecting pipe 12B.

The downstream end of each coil spring 3 is positioned substantially concentric with the axis line L and is fixed to the inner cylinder 7 sliding on the punching metal 2 in the direction of the axis line L.

The inner cylinder 7 includes a cylindrical portion 71 and a plate portion protruding outward in the radial direction from a portion of the outer circumferential surface of the cylindrical portion 71 (the portion on the downstream side of the fixed point of the coil spring 3). (72) is provided. In other words, the plate portion 72 is fixed to the outer circumferential surface of the cylindrical portion 71 .

The cylindrical portion 71 has an inner diameter equal to or slightly larger than the outer diameter of the punching metal 2 disposed inside each coil spring 3, and a pipe to which the downstream end of the punching metal 2 is fixed. It has an outer diameter equal to or smaller than the inner diameter of the upstream end of (the first connecting pipe 12A, the second connecting pipe 12B or the outlet pipe 13).

The downstream end of the cylindrical portion 71 is slidably inserted into the gap between the punching metal 2 and the pipe. The plate part 72 is a part connected to the rod of the driving device 5, and as shown in FIG. 3, for example, when viewed from the direction of the axis line L, it forms a triangular shape with rounded corners. To each corner of the plate portion 72, a rod of the driving device 5 (possible to be pushed and retracted) is fixed.

The outer cylinder 4 includes a main cylindrical portion 41 arranged substantially concentrically with the axis L at a distance from the coil spring 3 outward in the radial direction, and an annular ring attached to an opening on the upstream side of the main cylindrical portion 41. and an annular downstream end face portion 43 attached to the opening on the downstream side of the main cylindrical portion 41.

The upstream side end face 42 of the outer cylinder 4 of each unit 10 has an annular inner circumferential end face fixed to a pipe that fixes the upstream end of each coil spring 3 . Specifically, the upstream end face 42 of the first outer cylinder 4A is fixed to the inlet pipe 11, and the upstream end face 42 of the second outer cylinder 4B is connected to the first connecting pipe 12A. and the upstream end face 42 of the third outer cylinder 4C is fixed to the second connecting pipe 12B. Further, the downstream end face 43 of the outer cylinder 4 has an annular inner end face that abuts against the outer circumferential surface of the inner cylinder 7 via a sealing member such as an oil seal, for example. Thus, the outer cylinder 4 covers the coil spring 3 from the outside, and a space (permeate side space) is formed between the coil spring 3 and the outer cylinder 4.

A permeate discharge pipe 14 for discharging the permeate PW is connected to the lower outer surface of the main cylindrical portion 41 of the outer cylinder 4 . The permeate discharge pipe 14 includes a plurality of branch pipes 14a connected to at least one of the main cylindrical portions 41 of the outer cylinder 4 of each unit 10 from the upstream side and the lower side, and each branch pipe A confluence pipe (14b) connecting one end of the downstream side of (14a) to each other is provided.

An opening is formed in the main cylindrical portion 41 of each outer cylinder 4, and at the position of this opening, the other end of each branch pipe 14a is formed in a continuous, open state. The permeate PW passes through the branch pipe 14a from the space between the coil spring 3 and the outer cylinder 4 and joins at the confluence pipe 14b to, for example, a permeate storage tank (not shown). are sent

In addition, an opening for introducing the cleaning liquid CW into the screen device 1 is formed on the outer surface of the upper side of the main cylindrical portion 41 of the outer cylinder 4, and at the position of this opening, the cleaning liquid introduction pipe 15 One end is formed in a continuous through state. The other end of the washing liquid inlet pipe 15 connected to the main cylindrical portion 41 of each outer cylinder 4 is connected to the washing liquid supply device 30 .

The washer fluid supply device 30 is controlled by the control device 20, and when clogging of the coil spring 3 occurs, between the coil spring 3 and the outer cylinder 4 via the washer fluid inlet pipe 15. Backwashing is performed by supplying the cleaning liquid (CW) to the space of . As the washing liquid (CW) introduced from the washing liquid introduction pipe 15, for example, the permeate (PW) stored in the permeate storage tank described above can be used.

When another liquid is used as the washing liquid CW instead of the permeate PW stored in the permeate storage tank, the washing liquid CW of each unit 10 is prevented from entering the permeate storage tank. ) is joined to the confluence pipe 14b but before flowing into the permeate storage tank, the washing liquid CW used for backwashing is preferably discharged out of the system by a three-way valve (not shown) disposed in the pipe.

Further, in each unit 10, the opening to which the permeate discharge pipe 14 is connected is formed near the upstream end of the main cylindrical portion 41, and the opening to which the washing liquid inlet pipe 15 is connected is formed in the main cylindrical portion 41 Although it is formed near the downstream end of , the position of the opening to which the permeated liquid discharge pipe 14 and the washing liquid inlet pipe 15 are connected is not limited to this.

As shown in FIGS. 1 and 3 , the downstream side end face 43 of the outer cylinder 4 has an extension portion 43a that extends radially outward from the outer peripheral surface of the main cylindrical portion 41 . A driving device 5 is fixed to the downstream-facing surface of the extended portion 43a. In addition, the extension part 43a is a pipe fixing the downstream end of the punching metal 2 of one unit 10 (the first connecting pipe 12A, the second connecting pipe 12B or the outlet pipe 13) ) is fixed to the flange portion 17 formed in the through the stay portion 73. In other words, one end of the rod-shaped stay portion 73 is fixed to the extension portion 43a, and the other end of the stay portion 73 is fixed to the flange portion 17. In this way, the extension and contraction distance of the rod of the driving device 5 can be stably controlled.

As the driving device 5, a device such as an air cylinder having a cylinder having a piston inside and a rod integrally installed with the piston can be employed. The tip of the rod is fixed to the plate portion 72 . Therefore, the driving device 5 slides to push or pull the inner cylinder 7 in the axial line L direction (flow direction of the liquid W1 to be treated) by pushing or pulling the rod with the cylinder. can make it That is, under control by the control device 20, the driving device 5 can expand or contract the coil spring 3 fixed to the inner cylinder 7.

Here, as shown in FIG. 3 , three drive devices 5 are formed for each unit 10, but the number of drive devices 5 is not limited to this, and depending on the design, each unit ( 10), one or more driving devices 5 may be provided.

The permeate discharge pipe 14 is provided with a flow meter 23 that measures the flow rate of the permeate PW passing through the permeate discharge pipe 14 and transmits it to the controller 20 . In the screen device 1 shown in FIG. 1 , the entire permeate PW discharged from the three units 10 among the confluence pipes 14b of the permeate discharge pipes 14 connected to the three outer cylinders 4 is A flow meter (23) is installed at the point of confluence and distribution.

In addition, the screen device 1 includes a first pressure sensor 21A disposed inside the first punching metal 2A and detecting the pressure of the liquid to be treated and transmitting the pressure to the first pressure gauge 21; of the first pressure gauge 21 that calculates the pressure information received from the pressure sensor 21A and transmits the first pressure value P1 (measured value) to the controller 20 and the first coil spring 3A A second pressure sensor 22A disposed outside and inside the first outer cylinder 4A to detect the pressure of the permeate and transmit the pressure to the second pressure gauge 22, and the pressure received from the second pressure sensor 22A A second pressure gauge 22 is provided that calculates the information of and transmits the second pressure value P2 (measured value) to the control device 20.

Control device 20, during normal operation in which clogging of punching metal 2 and coil spring 3 does not occur, the eye width (gap G) of coil spring 3 of each unit 10 Each driving device 5 is controlled so that this becomes constant. In this way, in the screen device 1, treatment (solid-liquid separation or concentration) of the target liquid W1 according to the purpose is performed.

In addition, the control device 20 determines whether the flow rate measured by the flow meter 23 is less than the first threshold value Q or the first pressure value P1 measured by the first pressure gauge 21, which is measured by the second pressure gauge. When the differential pressure (ΔP) (= P1-P2) obtained by subtracting the second pressure value (P2) measured by (22) is equal to or greater than the second threshold value (P), it is judged that the clogging of the coil spring (3) has increased, A cutting operation of the impurity (T) is performed.

That is, when the flow rate of the permeate PW is less than the first threshold value Q, or when the pressure inside the first punching metal 2A is the outside of the first coil spring 3A and the first outer cylinder ( When the pressure on the inside of 4A) is higher than the second threshold value P, the impurity T caught between the wires 6 of the coil spring 3 is cut off.

Specifically, the control device 20 controls the drive device 5 to draw in the rod, and compresses the coil spring 3 by sliding the inner cylinder 7 upstream of the liquid W1 to be treated. More specifically, the control device 20 controls each of the first drive device 5A, the second drive device 5B, and the third drive device 5C, so that the first coil spring 3A, the second Each of the coil spring 3B and the third coil spring 3C is compressed. Thus, the first coil spring 3A, the second coil spring 3B and the third coil spring 3A, the second coil spring 3B and the third In each of the coil springs 3C, the impurity T is cut. In addition, the control device 20 may perform the cutting operation of the impurity T by repeatedly extending and contracting the coil spring 3 .

The control device 20 returns the coil spring 3 to the state before cutting after the end of the cutting operation of the impurity T. That is, each driving device 5 is controlled to push the rod, and the coil spring 3 is stretched so that the eye width of the coil spring 3 of each unit 10 becomes constant.

Further, the control device 20 may perform a backwashing operation of supplying the cleaning liquid CW from the cleaning liquid supply device 30 after the operation of cutting the impurities T.

The control device 20 may perform backwashing when only one of the determination using the measured values of the flowmeter 23 and the determination using the measured values of the two pressure gauges 21 and 22 indicates clogging, Backwashing may be performed when both judgments indicate clogging. In the former case, the flowmeter 23 or the pressure gauges 21 and 22 not used for determination can be omitted.

In addition, here, in the first unit 10A located most upstream, two pressure sensors (the first pressure sensor 21A and the second pressure sensor 22A) and corresponding pressure gauges (the first pressure gauge 21, A second pressure gauge (22) was disposed to control expansion and contraction of coil springs (3) of all units (10) connected in series. However, by disposing the same two pressure sensors and corresponding pressure gauges in plural or all units 10, respectively, the control device 20 controls the coil springs 3 of the units 10 in which the pressure sensors and pressure gauges are installed. The expansion and contraction of may be individually controlled according to the measured pressure value.

[2. action and effect]

According to the screening device (1), when the impurities (T) are clogged between the wire rods (6) of the coil spring (3), the wire rod (6) forming the edge shape of the first surface (61) and the second surface (62) ), the clogging of the coil spring 3 can be effectively eliminated.

Also, even when the screen device 1 is installed horizontally, since the punching metal 2 is formed inside the coil spring 3, the punching metal 2 serves as a mandrel, and the coil spring 3 does not bend For this reason, the eye width of the coil spring 3 can be controlled constant. Even when the axis L of the screen device 1 is inclined at an angle α with respect to the horizontal direction, the same effect is obtained.

Further, in the screen device 1, since the punching metal 2 having a large inner diameter and the punching metal 2 having a small inner diameter are sequentially connected from upstream to downstream of the liquid to be treated W1, the liquid to be treated ( The cross-sectional area of the punching metal 2 through which W1) passes (the area of the cross-section orthogonal to the axis L) gradually decreases in the flow direction. Thereby, in the upstream unit 10 (e.g., the first unit 10A), the liquid W1 to be treated flowing through the vicinity of the axis L passed without contacting the wall surface of the punching metal 2 , making it easier to contact the wall surface of the punching metal 2 on the downstream side, which has a smaller cross-sectional area than the punching metal 2 on the upstream side. Therefore, the filtration efficiency can be improved.

In addition, in the screen device 1, since the above effect is realized without forming a rotating shaft with a large number of yaws, as in the prior art, it can be manufactured at low cost.

Therefore, according to the screen device 1, even when installed horizontally, the opening width is uniform, and the flow rate of the liquid W1 to be treated contacting the wall surface of the punching metal 2, which is a filter, can be increased. Together, the device can be manufactured inexpensively.

The control device 20 determines whether the flow rate measured by the flowmeter 23 is less than the first threshold value Q, or the differential pressure ΔP obtained by subtracting the second pressure value P2 from the first pressure value P1. When it is equal to or greater than 2 threshold values P, each driving unit 5 is controlled to cut the clogged impurities T. In this way, by determining the degree of clogging of the coil spring 3 using the flow meter 23 or the pressure gauges 21 and 22, the clogging of the coil spring 3 can be eliminated inexpensively and reliably.

[3. modified example]

The above-mentioned screen device 1 is an example, and its structure is not limited to the above-mentioned one.

Fig. 4 is a partial cross-sectional perspective view of the punching metal 2 and coil spring 3 included in the screen device 1' of a modified example. This screen device 1' is a rotary device for increasing the flow rate of the liquid to be treated W1 contacting the punching metal 2 in at least one of the units 10 relative to the screen device 1 described above. (8) is different in that it is formed, and other configurations are the same.

As shown in FIG. 4 , the rotating device 8 may be disposed inside the punching metal 2 of any one unit 10 or inside the punching metal 2 of all units 10. . The rotating device 8 includes a rotating shaft 81 concentric with the axis L, and a balloon-shaped rotating body 82 that is formed to collapse toward the upstream side and has a rounded downstream end.

The rotating shaft 81 is coaxially disposed with the axis L of the punching metal 2, and is rotatably supported by, for example, a support member (not shown) fixed inside the punching metal 2. The supporting member may have a function of sliding the rotating shaft 81 along the axis L direction. To the downstream end of the rotating shaft 81, the upstream end of the rotary body 82 (the distal end 83 to be described later) is fixed. Further, a motor (electric motor) 87 may be provided on the upstream side of the rotating shaft 81 .

The rotating body 82 has an intermediate portion 85 formed in a substantially cylindrical shape and an end that gradually expands in the radial direction from upstream to downstream of the liquid to be treated W1 on the upstream side of the intermediate portion 85. A distal end 83 constituting a spreading shape and a distal end 84 constituting a shape gradually constricting from the upstream to the downstream of the target liquid W1 on the downstream side of the intermediate portion 85 (the radial dimension decreases) is largely distinguished by The outer diameter of the intermediate portion 85 is smaller than the inner diameter of the punching metal 2 .

The liquid to be treated (W1) flows from the front end (83) of the rotating body (82) to the middle section (85), enters the narrow passage between the middle section (85) and the punching metal (2), and ) to efficiently contact the wall of the For this reason, the filtration efficiency of the punching metal 2 and the coil spring 3 as filter elements is improved.

On the outer circumferential surface of the intermediate portion 85, four spiral-shaped rectifying blades 86 extending throughout the flow direction of the liquid to be treated W1 are fixed.

The target liquid W1 supplied to the screen device 1' flows through the space between the intermediate portion 85 and the punching metal 2. At this time, a force that rotates around the axis L acts on the commutation blade 86, thereby causing the rotating device 8 to rotate. That is, the rotating device 8 rotates around the axis L without power by the flow of the liquid W1 to be processed.

By rotating the rotating device 8, the liquid to be treated is agitated, so that the liquid to be treated can be effectively brought into contact with the wall surface of the punching metal 2. Further, the liquid to be treated flowing around the rectifying blades 86 is pushed out toward the outer space in the radial direction through the holes h of the punching metal 2 by the rectifying blades 86 . Thereby, the separation of the liquid W1 to be treated by the coil spring 3 is promoted, and the filtration efficiency is further improved.

The rotation speed may be adjusted by applying a regenerative brake to the motor 87 provided upstream of the rotation shaft 81 . Thereby, separation of the liquid W1 to be treated can be performed more appropriately. By using the electric power generated by the regenerative brake as power for lighting formed outside the screen device 1', it is possible to contribute to power saving of equipment in which the screen device 1' is installed. The rotating device 8 may have a function of adjusting the filtration efficiency by sliding the rotating shaft 81 along the axis line L.

A plurality of irregularities may be formed on the outer circumferential surface of the distal end portion 83 to make the liquid to be treated turbulent. Because the concave-convex shape can prevent the liquid to be treated flowing near the axis L from passing through without contacting the punching metal 2, the filtration efficiency can be further improved.

According to the screen device 1' of the modified example, by the rotation device 8 of a simple configuration by the rotation body 82 having the punching metal 2, the rotation shaft 81 concentric, and the commutation blades 86, The flow rate of the liquid to be treated W1 contacting the wall surface of the punching metal 2 can be increased. That is, since the flow rate of the liquid to be treated W1 in contact with the wall surface of the punching metal 2 can be increased without employing a complicated configuration in which a large number of indentations are formed on the rotary shaft as in Patent Document 2, it is inexpensive. It is possible to provide a screen device 1' that can be manufactured in a reasonable way.

Further, since the rotating device 8 rotates around the axis L without power by the flow of the liquid W1 to be treated without the motor 87, a device for rotating the rotating device 8 is provided. There is no need to do so, and the process of arranging the device can be omitted. Also by this, it is possible to provide a screen device 1' that can be manufactured at low cost.

Fig. 5 is a partial cross-sectional perspective view of the punching metal 2 and coil spring 3 included in the screen device 1'' of another modified example. This screen device 1" differs from the screen device 1' in FIG. 4 only in the shape of the rotating body 82 of the rotating device 8. Other configurations of the screen device 1” are the same as those of the screen device 1', so descriptions are omitted.

As shown in FIG. 5, the rotating device 8' includes a rotating shaft 81' identical to the rotating shaft 81 included in the rotating device 8 of FIG. A bullet-shaped rotary body 82' having an intermediate portion 85 provided therewith is provided. The rotating body 82' does not have a portion corresponding to the distal end 84 in the rotating body 82. Also in the rotating device 8' of this shape, the same effects as those of the rotating device 8 described above can be obtained.

1, 1', 1” : Screen device
2 : punching metal
2A: 1st punching metal
2B: 2nd punching metal
2C: 3rd punching metal
3 : coil spring
3A: 1st coil spring
3B: 2nd coil spring
3C: 3rd Coil Spring
4: outer cylinder
4A: 1st outer cylinder
4B: 2nd outer cylinder
4C: 3rd external cylinder
5: driving device
5A: 1st driving device
5B: 2nd driving device
5C: 3rd driving device
6: wire rod
7: inner tube
8, 8' : rotation device
10 : unit
10A: 1st unit
10B: second unit
10C: 3rd unit
11: inlet piping
12A: first connection pipe
12B: second connection pipe
13: outlet piping
14: permeate discharge pipe
14a: branch pipe
14b: confluence pipe
15: washing liquid inlet pipe
17: flange part
20: control device
21: first pressure gauge
21A: first pressure sensor
22: second pressure gauge
22A: second pressure sensor
23: flow meter
30: cleaning solution supply device
41: Juwon Tongbu
42: upstream cross section
43: downstream cross section
43a: extension
61: first side
62: 2nd side
71: inner tube
72: plate part
73: stay part
81, 81': rotation axis
82, 82': rotating body
83: distal end
84: distal end
85: middle part
86: commutation wing
87: motor
h : hole
D1: Inner diameter of the first punching metal
D2: inner diameter of the second punching metal
D3: Inner diameter of the third punching metal
L: axis
P: second threshold
P1: first pressure value
P2: 2nd pressure value
Q: first threshold
W1: liquid to be treated
W2: concentrate
PW: permeate
CW: cleaning liquid
T: impurity
α, β: Angle of the axis to the horizontal direction
θ: the angle formed by the first surface and the second surface

Claims (5)

A cylindrical first punching metal in which a plurality of holes are formed and a liquid to be treated is supplied;
A first coil spring in which a wire rod is spirally wound on the outside of the first punching metal;
A first outer cylinder covering the first coil spring from the outside at a distance from the first coil spring;
a cylindrical second punching metal connected to a downstream side of the flow direction of the liquid to be treated from the first punching metal, formed with a plurality of holes, and having a smaller inner diameter than the first punching metal;
A second coil spring in which a wire rod is spirally wound on the outside of the second punching metal;
A second outer cylinder covering the second coil spring from the outside at a distance from the second coil spring;
a first driving device that expands and contracts the first coil spring;
a second driving device that expands and contracts the second coil spring;
a control device for controlling the first driving device and the second driving device;
The first coil spring and the second coil spring include a first surface that is the spiral cylindrical surface and a second surface that is a spiral inclined surface having an acute angle with the first surface,
The control device controls the first driving device and the second driving device when an impurity is clogged between the wire rods, and the ridge of the wire rod forming the edge shape of the first surface and the second surface, A screening device that cuts the impurities in each of the first coil spring and the second coil spring. According to claim 1,
a permeate discharge pipe connected to the first outer cylinder and the second outer cylinder and discharging the permeate;
A flow meter installed in the permeate discharge pipe and measuring the flow rate of the permeate discharged from the permeate discharge pipe, or a first pressure gauge for measuring a first pressure value, which is the pressure inside the first punching metal, and the first Further having a second pressure gauge for measuring a second pressure value that is the pressure outside the coil spring and inside the first outer cylinder,
When the flow rate measured by the flow meter is less than the first threshold value,
or,
When the differential pressure obtained by subtracting the second pressure value from the first pressure value is equal to or greater than the second threshold value,
wherein the control device controls the first driving device and the second driving device to cut the impurity. According to claim 2,
Further comprising a rotating shaft concentric with the first punching metal or the second punching metal, and a rectifying blade receiving the flow of the liquid to be treated, and rotating around the rotating shaft,
The screen device increases the flow rate of the liquid to be treated in contact with the first punching metal or the second punching metal by rotating the rotating device. According to claim 3,
The front end of the rotating device has a shape that gradually widens in the radial direction from upstream to downstream of the liquid to be treated, with a spreading tip;
The front end is fixed to the rotating shaft,
The screen device in which the rotating device rotates without power when the rectifying vane receives the liquid to be treated. According to claim 4,
A screen device having a concavo-convex shape that makes the liquid to be treated a turbulent flow at the tip.

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