JP2013133588A - Solid separation device and solid separation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid separation device for reducing solid matter coating weight to a screen by using the deviation phenomenon of pressure distribution.SOLUTION: A solid separation device for separating a solid matter contained in liquid includes a separation tank having an inflow chamber 2 and an outflow chamber 3. The inflow chamber is shaped having a square plane cross section, and a supply part 9 is formed at the upper or lower part of the front side part in the inflow chamber. A first guide part 10 having a guide surface 11 at a rear side part 6 is disposed so as to be faced to the supply part, and a second guide part 12 having a guide surface 15 is disposed so as to be movable in a vertical direction, so that a liquid flow in the inflow chamber forms a vertical revolving flow by the guide surfaces of the first guide part and the second guide part. Planar screens 16 are formed so as to be faced to each other in parallel at a right side part 7 and a left side part 8 which are orthogonal to the outer peripheral face of the revolving flow formed in the inflow chamber. The outflow chamber 3 is formed such that its internal surface surrounds the outside of the inflow chamber, and a discharge part 26 is formed at the outflow chamber 3.

Description

  The present invention relates to a solid separation device and a solid separation method for separating solids (hereinafter also referred to as solids) contained in a liquid such as a sewer pipe.

  A part of drainage such as rainwater flowing into sewers laid in urban areas is stored or discharged in the ground by rainwater storage and penetration facilities, and the rest is discharged into rivers. The rainwater flowing through the sewer is contaminated with solids such as earth and sand, various garbage, papers, and fallen leaves. There is a disadvantage in terms of cost. In rainwater storage facilities for inundation countermeasures, rainwater temporarily stored underground without removing solids will be pumped up and discharged into rivers in fine weather. Cause pollution problems.

  On the other hand, wastewater flowing into wastewater treatment facilities such as factories often contains fine cutting powder, wood chips, solids such as garbage generated in the manufacturing process, and the same problems as sewerage. Arise. Therefore, as a means for avoiding such water pollution and environmental pollution, a separation device for separating solids in advance is provided on the upstream side of the sewer pipe, the waste water pipe or the processing equipment.

  Patent Document 1 discloses a solid material separation device provided in a pipeline such as a sewer. The separation device of Patent Document 1 is formed in a separation tank, a partition plate that partitions the inside of the separation tank into an inflow chamber and an outflow chamber, a screen provided in the partition plate, an inflow portion formed in the inflow chamber, and an outflow chamber. And a discharge section. The inflow chamber is provided with guide portions at the top and bottom of the inflow chamber for reversing the liquid flowing from the inflow portion to form a vertical swirling flow in the inflow chamber.

  In the separation device of Patent Document 1, the liquid flow supplied by the guide portion provided in the inflow chamber is changed into a vertical swirl flow, and both sides in a direction orthogonal to the outer peripheral surface of the swirl flow formed (both sides of the swirl flow). Two screens are arranged in parallel to face each other. The liquid in the inflow chamber is separated into solids by the screen and flows out to the outflow chamber side, and the liquid that has flowed out to the outflow chamber is discharged to the outside of the separation device from the discharge portion provided there.

  When two screens are arranged in parallel with each other on both sides in the direction orthogonal to the outer peripheral surface of the swirling flow in the vertical direction in this way, the screens are positioned orthogonal to the centrifugal force generated by the swirling flow. The force with which the solids are pressed against the screen by the centrifugal force of the swirling flow is low, and the solids can be easily separated from the screen surface by the swirling flow, and the cleaning interval of the screen can be increased. However, it has been found that further improvements are required in order to maintain the solid peelability in a high state for a longer period of time on the whole or most of the screen surface.

Japanese Patent No. 4395190

  In the above-described separation apparatus, according to experiments, the amount of solid matter adhered to the central area of the screen surface is maintained at a very low level even after long-term operation. Solid matter adhesion was confirmed. In other words, the pressure distribution of the swirling flow in the inflow chamber is uneven, which is the main cause of the solid matter adhesion amount in the peripheral region of the screen surface gradually increasing after long-time operation.

  When a vertical swirl flow is formed in the inflow chamber, the pressure in the region near the central axis of the swirl flow is lower than the region near the outer peripheral surface of the swirl flow. The phenomenon in which the pressure in the central region of the swirling flow is lower than that in the peripheral region is called a linkin vortex in terms of fluid dynamics. For example, the phenomenon in which the central portion of the vortex of the washing machine is dented corresponds to this phenomenon.

  Thus, in the region where the pressure is low, the force for pressing the solid matter against the screen surface is further reduced, and thereby the separation performance by the swirl flow is further improved. It is thought that the result is that the adhesion amount is extremely low.

  The present invention makes use of this pressure distribution bias phenomenon to significantly reduce the amount of solid matter adhering not only to the central area of the screen but also to the peripheral area. An apparatus for producing a low region of the temperature is provided.

  A first solid separation device of the present invention is a solid separation device that separates solids contained in a liquid, and includes a separation tank having an inflow chamber and an outflow chamber, and the inflow chamber is located above the bottom and the bottom. A supply portion for supplying a horizontal liquid flow into the inflow chamber is formed above or below the front side portion and has a rectangular shape with four sides on the front, rear, left and right sides. A first guide part having a guide surface that changes the direction of the liquid in a direction along the inner surface of the rear side part is provided on the rear side part so as to face the supply part, and the liquid flow whose direction has changed is directed in the horizontal direction toward the front side part. A second guiding portion having a guiding surface for changing the direction of the liquid flow is further provided on the rear side portion, and the guiding surface of the second guiding portion is movable in the vertical direction along the rear side portion. The liquid flow in the inflow chamber is moved in the vertical direction by the guide surfaces of the guide part and the second guide part. In order to allow the liquid in the inflow chamber to flow out to the outflow chamber side, the right and left sides of the inflow chamber orthogonal to the outer peripheral surface of the swirl flow formed in the inflow chamber are planar. The screens are formed in parallel with each other, the outflow chamber is formed so that the inner surface surrounds the outside of the four side portions of the inflow chamber, and the liquid discharge portion is formed in the outflow chamber. It is characterized by this.

  A second solid separation device of the present invention is a solid separation device for separating solids contained in a liquid, and includes a separation tank having an inflow chamber and an outflow chamber, and the inflow chamber extends upward from the bottom portion. And a supply portion for supplying a horizontal liquid flow into the inflow chamber is formed above or below the front side portion, and the horizontal liquid flow A first guide portion having a guide surface that changes the direction of the liquid in a direction along the inner surface of the rear side portion is provided on the rear side portion so as to face the supply portion, and the liquid flow changed in direction is changed to a liquid flow toward the front side portion. A second guiding portion having a guiding surface for changing the direction is provided in an intermediate portion of the rear side portion, and the guiding surface of the second guiding portion can change in the vertical angle with the fixed position of the rear side portion as a turning center. And thereby the liquid flow from the second guiding part toward the front side part The direction change angle can be changed in the vertical direction, and the liquid flow in the inflow chamber is configured to form a swirl flow in the vertical direction by the guide surfaces of the first guide portion and the second guide portion. In order to allow the liquid to flow out to the outflow chamber side, planar screens are formed on the right side and the left side of the inflow chamber orthogonal to the outer peripheral surface of the swirl flow formed in the inflow chamber so as to face each other in parallel. The outflow chamber is formed so that its inner surface surrounds the outside of the four side portions of the inflow chamber, and a liquid discharge portion is formed in the outflow chamber.

  A third solid separation device of the present invention is the solid separation device according to any one of the above, wherein the outflow chamber has a square cross section similar to the inflow chamber, or a circular cross section, an elliptical shape, a square shape, or an oval shape. It is either one.

  The solid separation method of the present invention is a solid separation method for separating solids contained in a liquid, using any one of the above-described solid separation devices, and flowing the liquid from the supply portion of the inflow chamber in the separation device. A swirl flow in the direction, and the solids are separated by the screen, and the liquid that has passed through the screen and has flowed into the outflow chamber is discharged from the discharge portion to the outside of the separation tank. The flow rate of the liquid supplied from the supply unit is set so that a negative pressure state is generated therein.

  In the first solid separation device of the present invention, the guide surface of the second guide part is movable in the vertical direction along the rear side part. The central axis of the swirling flow in the vertical direction is basically formed in an intermediate region in the vertical direction between the first guiding portion and the second guiding portion. For example, in the state where the liquid supply unit is formed above the front side portion and the position of the guide surface of the first guide portion is fixed to the upper portion of the rear side portion of the inflow chamber, the guide surface of the second guide portion is When set at the lowermost part of the rear side, the central axis of the swirling flow in the vertical direction is formed in the substantially central region in the vertical direction of the inflow chamber, and the pressure in that region is the lowest, and the solids peelability of the screen in this region Is the highest.

  In the above, when the guiding surface of the second guiding part is moved upward from the lowermost part, the central axis of the vertical swirling flow is also moved upward according to the movement, and a part of the swirling flow is The branching into the inflow chamber below the two guide portions forms a swirling flow in the vertical direction opposite to the upper side.

  When the guiding surface of the second guiding part is moved further upward from the center position in the vertical direction of the rear side part in the inflow chamber, the main part of the swirling flow is gradually increased from the upper side to the lower side of the second guiding part accordingly. Move. As described above, the center axis position of the vertical swirling flow moves in the vertical direction in accordance with the movement of the guiding surface of the second guiding portion, and the dividing ratio of the swirling flow also changes. And the area | region where the pressure of the center axis | shaft of two swirl | vortex flows moves to a wide range, and the solid substance peelability of the screen in this area | region is improved.

  That is, by periodically moving the position of the guide surface of the second guide part periodically or from time to time, each region of the screen surface can be sequentially changed to a region having a high solid material peelability, thereby adhering to the screen. The amount of solid matter is made more uniform over the entire screen surface. As a result, the total amount of solid matter adhering to the screen surface is also reduced, and the maintenance interval for screen cleaning can be made longer than in the prior art. In the state where the liquid supply part is formed below the front side part and the position of the guide surface of the first guide part is fixed to the lower part of the rear side part of the inflow chamber so as to face it, the direction of the swirl flow in the vertical direction The effect is the same as described above, except that is reversed.

  In the second solid state separation device of the present invention, the guide surface of the second guide portion can change in the vertical direction with the inner surface of the rear side portion as the turning center. For example, the liquid supply part is formed above the front side part, and the position of the guide surface of the first guide part is fixed to the upper part of the rear side part of the inflow chamber so as to face the liquid supply part. If the angle is set so as to be the most downward, the liquid flow that has been turned downward by the first guide portion is turned downward by the guide surface of the second guide portion, that is, the direction toward the bottom of the inflow chamber. As a result, the vertical swirl flow having the central axis in the central region in the vertical direction in the inflow chamber is 1 as in the case where the guide surface of the second guide portion is set at the lowest position in the inflow chamber in the first invention. Formed.

  When the angle of the guide surface of the second guide portion is sequentially changed from the lower direction to the horizontal direction as described above, the guide surface of the second guide portion is sequentially moved above the inflow chamber in the first invention. The central axis of the swirling flow in the vertical direction also moves upward according to the change in the angle, and at the same time, a part of the swirling flow branches into the inflow chamber on the lower side of the second guiding portion and moves up and down in the direction opposite to the upper side. A swirling flow in the direction is formed.

  When the guiding surface of the second guiding part is moved further upward from the horizontal direction, the main part of the swirling flow is also moved to the lower side of the second guiding part accordingly. As described above, the center axis position of the vertical swirling flow moves in the vertical direction in accordance with the change in the angle of the second guiding portion, and the dividing ratio of the swirling flow also changes. And the area | region where the pressure of the central axis of two swirl | vortex flows is also moved to a wide range, and the solid substance peelability of the screen in this area | region is improved. In the state where the liquid supply part is formed below the front side part and the position of the guide surface of the first guide part is fixed to the lower part of the rear side part of the inflow chamber so as to face it, the direction of the swirl flow in the vertical direction The effect is the same as described above, except that is reversed.

  A third solid separation device of the present invention is the solid separation device according to any one of the above, wherein the outflow chamber has a square cross section similar to the inflow chamber, or a circular cross section, an elliptical shape, a square shape, or an oval shape. It is either, The solid-state separator characterized by the above-mentioned. The feature of the present invention lies in the shape of the inflow chamber and the second guiding portion, and the shape of the outflow chamber is not particularly limited, and since the degree of freedom of the shape is high, a shape suitable for installation conditions can be adopted.

  The solid separation method of the present invention is a separation method using any one of the above-described solid separation devices, in which a liquid flows in from the supply portion of the inflow chamber in the device, forms a swirling flow in the vertical direction in the inflow chamber, The solids are separated by the two screens, and the liquid that has passed through the screens and has flowed into the outflow chamber is discharged from the discharge unit to the outside of the separation tank. The flow rate of the liquid supplied from the supply unit is set so that a negative pressure state occurs.

  The pressure in the vicinity of the rotation center axis of the swirling flow in the vertical direction decreases in inverse proportion to the increase in the flow velocity of the liquid supplied to the inflow chamber, and as the flow velocity of the liquid is gradually increased, the swirling flow in the vertical direction The pressure in the liquid in the vicinity of the rotation center axis changes from a positive pressure state to a negative pressure state. In a negative pressure state, a part of the liquid that has passed through the screen and has flowed out to the outflow chamber side is attracted to the negative pressure, and reversely passes through the screen and returns to the outflow chamber side.

  Therefore, in the separation method of the present invention, the screen in the vicinity of the rotation center axis of the swirling flow in the vertical direction is always back-washed by the action of the liquid flowing back from the outflow chamber side, and the solids releasability in this region is further enhanced Become. By moving the position of the rotation center axis of the swirling flow in the vertical direction as described above, the reverse cleaning region can be moved over a wide range.

It is a figure showing a 1st embodiment of a solid separation device of the present invention. It is the figure which showed typically the principal part of the inflow chamber 2 shown in FIG.1 (b). It is a figure which shows 2nd Embodiment of the solid-state separator of this invention. It is a figure which shows 3rd Embodiment of the solid-separation apparatus of this invention. It is a figure which shows typically what changed the plane cross-sectional shape (square shape) of the outflow chamber in the example of FIG.

  Next, the best embodiment of the present invention will be described with reference to the drawings. 1A and 1B show a first embodiment of a separation apparatus according to the present invention. FIG. 1A is a plan sectional view taken along the line BB in FIG. 1B, and FIG. 1B is a view taken along the line AA in FIG. FIG.

  The separation device 1 includes an inflow chamber 2 and an outflow chamber 3 provided so as to surround the outer peripheral surface from the outside. The inflow chamber 2 includes a bottom portion 4 having a flat upper surface and four side surfaces extending from the bottom portion 4 in the front, rear, left and right directions, ie, flat side portions, that is, a flat front side portion 5, a rear side portion 6, and a right side portion, respectively. (Right side as viewed from the front side portion) 7 and left side portion (left side as viewed from the front side portion) 8, each side portion extends vertically upward from the bottom portion 4, as shown in FIG. The figure is a square consisting of a long side and a short side. In the apparatus shown in the figure, the upper end of the inflow chamber 2 is opened and the liquid can overflow from the inflow chamber 2 to the outflow chamber 3, but a lid may be detachably fixed to the inflow chamber 2. When the liquid to be pressurized is a pressurized liquid, it is preferable that the inflow chamber 2 be sealed with a lid so that the liquid does not leak from the upper portion of the inflow chamber 2.

  A liquid supply portion 9 is formed above the front side portion 5 of the inflow chamber 2. The supply unit 9 is configured by a pipe that horizontally penetrates the outflow chamber 3 and the front side portion 5 of the inflow chamber 2, and jets the liquid to be processed into the inflow chamber 2 from above toward the rear side portion 6. It has become.

  A position above the rear side portion 6 of the inflow chamber 2 and facing the supply portion 9 (specifically, a position where the liquid flow ejected horizontally from the supply portion 9 strikes when moved horizontally as it is). One guide portion 10 is provided. The first guide portion 10 is formed of a flat plate and is fixed to the rear side portion 6 in an inclined state from the rear side portion 6 toward the front side portion 5, and the flat lower surface of the first guide portion 10 in the inclined state forms the guide surface 11. To do.

  A second guiding portion 12 that is movable in the vertical direction is provided on the rear side portion 6 below the first guiding portion 10. The second guide part 12 has an inclined part 13 slidably mounted along the rear side part 6 and a flat plate-like horizontal part 14 extending horizontally from the inclined part 13, and the flat upper surface of the inclined part 13 and the horizontal part 14. The guide surface 15 of the second guide portion 12 is formed by the flat upper surface. In addition, the inclination angle in the guide surface of the 1st guide part 10 and the 2nd guide part 12 is suitably set by experiment etc. so that the formation efficiency of a vertical swirl flow may become the optimal.

  In order to slidably mount the second guide portion 12 on the rear side portion 6, for example, a vertical and linear concave cross-section slide guide is fixed to the inner surface of the rear side portion 6, and the inclined portion of the second guide portion 12 is fixed. An engaging portion having a vertical protrusion is provided at 13, and a rod-shaped operation portion is extended upward from the upper end of the protrusion. Then, when the operation rod is moved up and down from above the inflow chamber 2 with the projections fitted in the recesses of the slide guide, the second guide portion 12 can move up and down along the rear side portion 6. .

  A flat rectangular screen 16 is mounted on the right side portion 7 and the left side portion 8 of the inflow chamber 2 so as to be parallel to each other. The screen 16 allows the liquid in the inflow chamber 2 to pass therethrough and blocks the passage of solid substances contained in the liquid, and adopts a rigid punch metal type screen or wedge wire type screen used in this field. can do. When a wedge wire type screen is employed, it is desirable to mount the wedge wire so that the axis of the wedge wire is in the vertical direction.

  As a method for mounting the wedge wire type screen, for example, a rectangular opening is formed in each of the right side portion 7 and the left side portion 8, slide guides are formed on both sides perpendicular to the opening portion, and a flat rectangular wedge is formed. A wire type screen is slid onto the slide guide from above. The screen 16 is appropriately selected to have a hole diameter or a gap corresponding to the particle size of the solid to be separated.

  The outflow chamber 3 includes a bottom portion 20 having a flat upper surface and four front and rear, left and right side portions extending upward from the bottom portion 20, that is, a front side portion 21, a rear side portion 22, a right side portion 23, and a left side portion, each having a flat plate shape. 24 and each side extends vertically upward from the bottom 20. The outflow chamber 3 of the present embodiment has a rectangular shape with a long cross section and a short side, and is similar to the flat cross section of the inflow chamber 2, and a lid 25 is detachable at the upper end portion. It is installed. In the present embodiment, the bottom 20 of the outflow chamber 3 is shared with the bottom 4 of the inflow chamber 2, but the inflow chamber 2 and the outflow chamber 3 may have independent bottoms.

  As shown in FIG. 1, the four side portions of the outflow chamber 3 are disposed so as to surround the four side portions of the inflow chamber 2, and are formed so as to be compact as a whole. A liquid discharge portion 26 formed of a tubular body is formed above the rear side portion 22 of the outflow chamber 3.

  Next, the operation of the solid separation device will be described. First, when the second guiding portion 12 is set at the lowermost portion of the inflow chamber 2 as shown in FIG. 1, when the liquid to be processed is supplied from the supply portion 9 to the upper portion of the inflow chamber 2 in the horizontal direction, the liquid flow is first. The direction is changed downward by the guide surface 11 of the guide unit 10.

  The liquid flow changed in the downward direction is changed into a horizontal liquid flow toward the front side portion 5 by the guide surface 15 of the second guide portion 12, and then the liquid flow rises along the front side portion 5 and is newly supplied from the supply portion 9. The liquid flow that is jetted into the first flow is merged to become a horizontal liquid flow toward the first guiding portion 10 again. In this way, as shown by a dotted line in FIG. 1B, a vertical swirling flow having a rotation center axis S (clockwise as viewed from the front of the drawing) is continuously formed in the inflow chamber 2. The liquid flow descending from the upper side to the second guiding portion 12 is first changed in the horizontal direction by the guiding surface 15 of the inclined portion 13, and in the horizontal direction by the guiding surface 15 of the horizontal portion 14 extending in the horizontal direction. The moving force is stabilized.

  A part of the swirling liquid passes through the two screens 16 as shown by arrows in FIG. 1A and flows out to the outflow chamber 3 side, and then flows from the discharge part 26 of the outflow chamber 3 to the outside of the separation device. Discharged. On the other hand, solids contained in the liquid are blocked by each screen 16. Most of the solid matter blocked by each screen 16 swirls in the outflow chamber 2 by swirling flow, but part of the solid matter adheres to the surface of the screen 16 (surface on the inflow chamber 2 side).

  Most of the solid matter adhering to the surface of the screen 16 is peeled off the screen 16 by the swirling action of the swirling flow and returns to the swirling flow, but the peeling performance at that time is proportional to the swirling flow velocity of the swirling flow in the vertical direction. For example, it is proportional to the flow rate of the liquid supplied from the supply unit 9. However, a part of the solid matter may remain adhered to the surface of the screen 16 and remain, and when it gradually accumulates, the separation process is temporarily interrupted to perform screen cleaning (maintenance work). There is a need.

  The amount of solids remaining on the screen surface tends to be proportional to the liquid pressure pressing the screen surface, and this tendency is relatively low in the rotating shaft region of the swirling flow where the pressing force in the swirling flow in the vertical direction is low. It is relatively high in the peripheral region where is high. As described above, the solid separation apparatus of the present invention is configured to be able to appropriately move the rotation center axis of the swirling flow in the vertical direction, thereby reducing the solid matter remaining problem on the screen surface.

  The flow velocity of the swirling flow on the surface of the screen 16 is proportional to the flow velocity of the liquid supplied from the supply unit 9, and from the central region of the swirling flow (rotational center axis region of swirling) to the outer peripheral region (outer peripheral surface region of the swirling flow) ) The greater the flow velocity. When the flow velocity of the swirl flow is gradually increased, the pressure toward the screen 16 in the outer peripheral region of the swirl flow (liquid pressure that presses the surface of the screen 16) increases accordingly, but the pressure on the screen 16 in the central region is increased. The pressure (liquid pressure that presses the surface of the screen 16) decreases conversely, and finally turns to a negative pressure state.

  For example, as a result of an experiment using a separation device in which two rectangular screens 16 having a length of 1000 mm and a width of 450 mm are mounted on both sides of a cubic inflow chamber in parallel and spaced from each other by 500 mm, It was found that when the flow velocity of the swirling flow flowing in the vicinity of both ends in the horizontal direction (direction of 450 mm) reached about 1 m / s, the pressure in the central region of the swirling flow turned to the negative pressure region. At that time, the liquid flows out from the inflow chamber 2 to the outflow chamber 3 at a flow velocity of about 1 m / s near both ends of the short side of the screen 16, but conversely, in the central region of the screen 16, the liquid flows out of the outflow chamber 3. 2 flows in at a flow rate of about 0.3 m / s.

  This negative pressure region, when viewed at a right angle from the surface of the screen 16, has a substantially circular or elliptical shape (an ellipse with a somewhat longer vertical direction of the screen) centered on the central region of the swirling flow. Further, it was confirmed that as the flow velocity of the swirl flow was further increased, the size of the negative pressure region (the negative pressure area of the surface parallel to the screen 16) also increased in proportion thereto.

  When the central region of the swirl flow is in a negative pressure state, the liquid flow in that region becomes a flow (back flow) from the outflow chamber side to the inflow chamber side. In such a region where the liquid flows backward, the solid matter adhering to the screen 16 is reversely pressed from the back surface, so that the solid matter peeling effect on the screen 16 is remarkably increased, and the solid matter is peeled off more efficiently. be able to.

  FIG. 2 is a diagram schematically showing the main part of the inflow chamber 2 shown in FIG. 1B. FIG. 2A is a diagram in which the position of the second guiding part 12 is raised somewhat from the lowermost part of the rear side part 6. The figure which shows the mode of the liquid flow in the inflow chamber 2 at the time, (b) is the inside of the inflow chamber 2 in the inflow chamber 2 when the position of the 2nd guide part 12 is raised to the center part of the rear side part 6. The figure which shows the mode of the liquid flow of (c) is a figure which shows the mode of the liquid flow in the inflow chamber 2 when the position of the 2nd guide part 12 is raised to the upper part of the rear side part 6. FIG.

  In the case of FIG. 2 (a), it is above the guiding surface of the second guiding portion 12 and slightly above the central portion in the inflow chamber 2, in the vertical direction substantially close to the size shown in FIG. 1 (b). A flow (clockwise as viewed from the front of the figure) is formed, and a small swirl flow in the vertical direction is formed at the lower side of the second guide portion 12. The swirl direction of this small swirl flow is a swirl flow in the vertical direction in the opposite direction (counterclockwise when viewed from the front) to the large swirl flow formed above the second guiding portion 12.

  This phenomenon is caused by the fact that the guiding surface of the second guiding portion 12 rises slightly from the bottom of the inflow chamber 2 to create a space area below the small space, and a liquid flow as shown in the drawing is directed to the space area near the front side portion 5. It was proved from the experiment and the analysis that it swirled in and then swirled, and this formed such a small vertical swirl flow. Although the improvement in the separation performance of the solid matter remaining on the surface of the screen 16 due to this small swirl flow cannot be expected, the rotation center axis region of the large swirl flow formed on the upper side of the second guiding portion 12 is larger than that in the case of FIG. Since the low pressure region moves upward due to the movement inside, the wide range peeling performance improvement effect intended by the present invention can be sufficiently exerted.

  In the case of FIG. 2B, the upper and lower sides of the second guiding portion 12 are substantially the same size and opposite to each other with the central portion in the vertical direction of the inflow chamber 2 as the boundary (the upper side is clockwise when viewed from the front, A swirling flow in the vertical direction is formed with the lower side counterclockwise as viewed from the front. That is, the guide surface 15 of the second guide portion 12 rises from the bottom of the inflow chamber 2, and a space area having the same size as the upper side is formed below the inflow chamber 2. The phenomenon of swirling by flowing from the vicinity of the part 5 occurs, whereby two swirling flows of the same magnitude in opposite directions are formed. In such a case, the regions of the two swirling flow centers of the rotational axes are separated from each other and are separated from each other in the vertical direction from the state of FIG. 1B, so that the solids releasability in these regions can be improved. . Note that the lower surface of the guide surface 15 of the second guide portion 12 is formed as a flat surface, and there is no effect on the lowering of the flow velocity of the lower swirling flow.

  In the case of FIG. 2C, the size of the vertical swirling flow in the inflow chamber 2 on the upper side of the second guiding portion 12 is smaller than that in the case of FIG. The swirling flow in the vertical direction in the inflow chamber 2 on the lower side is large. This is because the space area on the upper side of the second guiding portion 12 is reduced and the space area on the lower side is increased. Although the improvement in the separation performance of the solid matter remaining on the surface of the screen 16 due to the small swirl flow is reduced, the rotation center axis region of the large swirl flow formed below the second guide portion 12 is larger than that in the case of FIG. Since the low pressure region is moved downward due to the downward movement of the inside, the wide range peeling performance improvement effect intended by the present invention can be sufficiently exhibited.

  3A and 3B show a second embodiment of the solid separation device of the present invention, in which FIG. 3A is a plan sectional view taken along the line CC of FIG. 3B, and FIG. 3B is a DD arrow of FIG. FIG. 1 is different from the example of FIG. 1 only in the position of the supply section 9 in the inflow chamber 2 and the positions of the first guide section 10 and the second guide section 12, and the rest is configured similarly. For this reason, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3 (b), in the present embodiment, the supply section 9 is formed below the front side section 5 of the inflow chamber 2, and the liquid is ejected therefrom in the horizontal direction. The first guiding part 10 is provided below the rear side part 6 so as to face the supply part 9, and the second guiding part 12 is provided above the rear side part 6, and the second guiding part 12 is shown in FIG. Like the example, it can be moved in the vertical direction.

  Next, the operation of this embodiment will be described. First, as shown in FIG. 3B, when the second guiding portion 12 is set at the uppermost portion of the inflow chamber 2, when the liquid to be processed is supplied from the supply portion 9 to the lower portion of the inflow chamber 2 in the horizontal direction, The flow changes its direction upward by the guide surface 11 of the first guide part 10.

  The liquid flow changed in the upward direction is changed to a horizontal liquid flow toward the front side portion 5 by the guide surface 15 of the second guide portion 12, and then the liquid flow is lowered along the front side portion 5 and newly supplied from the supply portion 9. The liquid flows in the horizontal direction toward the first guiding portion 10 again while merging with the liquid flow ejected in the first direction. In this way, as shown by a dotted line in FIG. 3B, a vertical swirling flow having a rotation center axis S (counterclockwise when viewed from the front in the figure) is continuously formed in the inflow chamber 2. .

  A part of the swirling liquid passes through the two screens 16 as shown by arrows in FIG. 3A and flows out to the outflow chamber 3 side, and then is discharged to the outside of the separation device through the discharge unit 26. . The movement of the rotation center axis region of the swirling flow due to the vertical movement of the second guiding portion 12 and the effect thereof are the same as those in the example of FIG.

  4A and 4B show a third embodiment of the present invention, in which FIG. 3A is a plan sectional view taken along line FF in FIG. 3B, and FIG. 4B is a view taken along line E-E in FIG. It is a sectional side view. The difference of the present embodiment from the example of FIG. 1 is only the structure of the second guiding portion and its operation, and the rest is configured similarly. For this reason, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The second guide portion 12 of the present embodiment is fixed to the middle portion (or center portion) of the rear side portion 6 in the vertical direction, and the vertical angle of the guide surface 15 can be changed. The second guide part 12 has a fixed part 12a fixed to the rear side part 6 and a flat and rectangular extension part 12b rotatably connected to the fixed part 12a. A guide surface 15 is provided on the upper surface of the extension part 12b. Is formed.

  In order to connect the extension portion 12b to the fixing portion 12a in a rotatable manner, for example, a rotation shaft having a horizontal axis is provided on the fixing portion 12a, the rear end portion of the extension portion 12b is fixed to the rotation shaft, and a circular shape is provided. The gear portion is connected, and a rod-like rack extending vertically to the upper portion of the inflow chamber 2 is screwed into the gear portion. Then, by operating the rack up and down from above the inflow chamber 2, the angle in the vertical direction of the guide surface 15 of the second guide portion 12 is changed.

  As described above, the second guide portion 12 is fixed to the middle portion (or center portion) of the rear side portion 6 in the vertical direction, and the fixing position thereof is when the second guide portion 12 is rotated downward to the maximum. In addition, the front end of the inflow chamber 2 is not in contact with the bottom 4 or above the position. In addition, when the length of the 2nd guide part 12 is quite small compared with the length of the up-down direction of the rear side part 6, there is no dimensional restriction | limiting of a fixed position.

  As shown in FIG. 4B, when the liquid to be processed is supplied from the supply unit 9 to the upper part of the inflow chamber 2 in the horizontal direction with the guide surface 15 of the second guide unit 12 set to the lowest angle. The liquid flow changes its direction downward by the guide surface 11 of the first guide part 10.

  The liquid flow changed in the downward direction is changed into a horizontal liquid flow toward the front side portion 5 by the guide surface 15 of the second guide portion 12, and then the liquid flow rises along the front side portion 5 and is newly supplied from the supply portion 9. The liquid flows in the horizontal direction toward the first guiding portion 10 again while merging with the liquid flow ejected in the first direction. In this manner, a vertical swirling flow (clockwise as viewed from the front of the figure) having a rotation center axis S as shown by a dotted line in FIG. 1B is continuously formed in the inflow chamber 2.

  A part of the swirling liquid passes through the two screens 16 and flows out to the outflow chamber 3 side as shown by arrows in FIG. 4A, and then is discharged to the outside of the separation device through the discharge unit 26. The On the other hand, solids contained in the liquid are blocked by the screen 16. The solid matter blocked by the screen 16 swirls in the outflow chamber 2 in a swirling flow, and part of the solid matter adheres to the surface of the screen 16 (the surface on the inflow chamber 2 side).

  Next, when the angle of the extension portion 12b is changed so that the guide surface 15 of the second guide portion 12 is in the horizontal direction, two vertical swirl flows having the same size similar to the case of FIG. The two swirl flows are in opposite directions (the swirl flow on the upper side of the guide surface 15 is clockwise when viewed from the front of the figure and the lower side of the guide surface 15 is counterclockwise when viewed from the front of the figure). When the angle of the guiding surface 15 of the second guiding portion 12 is further changed upward, two vertical swirling flows similar to the case of FIG. 2C are formed. That is, the upper side of the guide surface 15 is a small swirl flow, and the lower side is a large swirl flow. These functions and effects are also the same as in the cases of FIGS.

  FIG. 5 is a schematic view of the outflow chamber 3 in the example shown in FIG. 1 with the flat cross-sectional shape (rectangular shape) changed, and the inflow chamber 2 and its peripheral portion are the same as in the example of FIG. (A) in FIG. 5 has the side part with the circular cross section of the outflow chamber 3, and it may have an elliptical side part as a thing similar to this. FIG. 5 (b) shows that the outflow chamber 3 has an oval side section, and FIG. 5 (c) shows that the outflow chamber 3 has a square side section. In any shape, there is almost no influence on the formation of a swirling flow in the vertical direction in the inflow chamber 2, and the feature of the present invention is that the outflow chamber 3 has a high shape freedom.

  The solid separation device and the solid separation method of the present invention can be used to separate solids contained in a liquid such as a sewer.

DESCRIPTION OF SYMBOLS 1 Separator 2 Inflow chamber 3 Outflow chamber 4, 20 Bottom part 5, 21 Front side part 6, 22 Rear side part 7, 23 Right side part 8, 24 Left side part 9 Supply part 10 First guide part 11 Guide surface 12 Second guide part 13 Inclination part 14 Horizontal part 15 Guide surface 16 Screen 25 Cover 26 Discharge part

Claims (4)

In a solid separation device for separating solids contained in a liquid, a separation tank having an inflow chamber and an outflow chamber is provided,
The inflow chamber has a bottom portion and four side portions on the front, rear, left and right extending upward from the bottom portion and has a rectangular shape in cross section, and a supply portion for supplying a horizontal liquid flow into the inflow chamber is located above the front side portion or A first guide part formed below and having a guide surface that changes the liquid flow in the horizontal direction in a direction along the inner surface of the rear side part is provided on the rear side part facing the supply part, and the direction change A second guiding portion having a guiding surface for changing the direction of the liquid flow into a horizontal liquid flow toward the front side portion is further provided on the rear side portion, and the guiding surface of the second guiding portion extends along the rear side portion. It is configured to be movable in the vertical direction, and the liquid flow in the inflow chamber is configured to form a vertical swirl flow by the guide surfaces of the first guide part and the second guide part,
In order to allow the liquid in the inflow chamber to flow out to the outflow chamber, planar screens are formed in parallel to each other on the right and left sides of the inflow chamber perpendicular to the outer peripheral surface of the swirl flow formed in the inflow chamber. Has been
The outflow chamber is formed so that its inner surface surrounds the outside of the four side portions of the inflow chamber, and the liquid discharge portion is formed in the outflow chamber. In a solid separation device for separating solids contained in a liquid, a separation tank having an inflow chamber and an outflow chamber is provided,
The inflow chamber has a bottom portion and four side portions on the front, rear, left and right extending upward from the bottom portion and has a rectangular cross section, and a supply portion for supplying a horizontal liquid flow into the inflow chamber is located above the front side portion or A first guide part formed below and having a guide surface that changes the liquid flow in the horizontal direction in a direction along the inner surface of the rear side part is provided on the rear side part facing the supply part, and the direction change A second guide portion having a guide surface for changing the direction of the liquid flow to the liquid flow toward the front side portion is provided in an intermediate portion of the rear side portion, and the guide surface of the second guide portion has a fixed position of the rear side portion. It is possible to change the angle in the vertical direction around the turning center, thereby changing the direction change angle of the liquid flow from the second guiding part to the front side part in the vertical direction. 2 The liquid flow in the inflow chamber is swung up and down by the guide surface of the guide section. It is configured to form a flow,
In order to allow the liquid in the inflow chamber to flow out to the outflow chamber, planar screens are formed in parallel to each other on the right and left sides of the inflow chamber perpendicular to the outer peripheral surface of the swirl flow formed in the inflow chamber. Has been
The outflow chamber is formed so that its inner surface surrounds the outside of the four side portions of the inflow chamber, and the liquid discharge portion is formed in the outflow chamber.   3. The solid separation according to claim 1, wherein the outflow chamber has a square shape with a plane section similar to the inflow chamber, or a plane section with a circular shape, an elliptical shape, a square shape, or an oval shape. apparatus.   In a solid separation method for separating a solid contained in a liquid, the liquid separation device according to any one of claims 1 to 3 is used, and a liquid is introduced from the supply unit to generate a vertical swirling flow. Form and separate the solids with the screen, and the liquid that has passed through the screen and flowed out into the outflow chamber is discharged from the discharge section to the outside of the separation tank, and the negative pressure state in the liquid near the rotation center axis of the vertical swirl flow The solid separation method is characterized in that the flow rate of the liquid supplied from the supply unit is set so as to be generated.