JP4623653B2 - Sand settling equipment - Google Patents

Description

  The present invention relates to a sand settling facility that separates and sinks sand in raw water flowing through a water treatment facility and guides it to a storage hopper.

In a water treatment facility such as a sewage treatment plant, a water treatment plant, or various factory wastewater treatment plants, as described in Patent Document 1, a sand basin that settles and separates sand mixed in raw water is separated by this sand basin. A sand pumping device that pumps the collected sand together with the raw water, a large-capacity separating device that separates the sand from the raw water pumped by the sand lifting device, a screw conveyor device that transports the separated sand to a storage hopper, And the above-mentioned storage hopper.
Japanese Patent Laid-Open No. 3-146147

  As described above, in the conventional water treatment facility, the sand in the raw water from the sand lifting device is separated by a large-capacity separating device, and the separated sand is conveyed to the storage hopper using a screw conveyor device. A large space is required from the sand lifting device to the storage hopper. Therefore, for example, it is very difficult to arrange the separation device and the screw conveyor device in a limited space such as underground.

  The object of the present invention has been made in consideration of the above-mentioned circumstances, and is intended to make the equipment compact by combining the equipment that separates, settles and accumulates the sand in the raw water and leads it to the storage hopper. The object is to provide a sedimentation facility that can realize space.

The invention according to claim 1 is a separation device that separates sand in raw water supplied from a raw water transport pipe , and a sand settling device that sinks and accumulates the sand separated by the separation device and guides it to a storage hopper. bets are placed together, respectively top and bottom, the separating device is connected to the raw water transport pipe, with the deceleration channel and the deceleration channel Ru slow down the flow rate of raw water supplied from the raw water transport pipe It is set, by flowing the raw water is decelerated at the deceleration channel spirally and separation flow path comprises a helical flow path of the helical structure which separates the sand from the raw water by the action of gravity and centrifugal force, the separation flow A slit that is provided on the bottom surface of the path and that separates the sand separated when the raw water flows through the separation flow path into the sand settling device, and the raw water from which the sand has been separated in the separation flow path, Sand sediment accumulation formed in the central part of Allowed to flow from the discharge port to open to the location, anda drain passage leading to drainage by overflow in the grit integrated device, the settling integrated device is provided below the separator, the The sand that has fallen from the slit and the discharge port is deposited on the bottom surface, and a sand settling chamber in which a sand discharge port is formed at the center of the bottom surface, and the sand settling chamber rotates in a horizontal plane in the sand settling chamber. A scraping device for accumulating sand deposited on the sand discharge port of the sand settling chamber, a drain valve in the sand settling chamber of the sand settling device, and a sand discharge valve downstream of the sand discharge port in the sand settling chamber. These valves are installed and opened when the supply of raw water to the separator is stopped, and the raw water in the separator and the sand settling device is drained through the drain valve, and the sand in the sand settling chamber is drained. The storage port passes through the sand port and the sand discharge valve. It is characterized in that is configured to be introduced into the path.

According to a second aspect of the present invention, in the first aspect of the present invention, the slit of the separation channel of the separation device is a bottom surface of the separation channel along the outer peripheral wall in the centrifugal force acting direction in the separation channel. In addition, the bottom surface of the separation channel is configured as an inclined bottom surface that is inclined obliquely downward toward the slit.

According to a third aspect of the present invention, in the first aspect of the present invention, of the separation device and the sand settling device that are integrally disposed, storage is performed vertically below the sand discharge port in the sand discharge chamber of the sand settling device. A hopper is connected.

According to the first aspect of the present invention, since the flow rate of the raw water is reduced in the separation channel of the separation device, the sand in the raw water is subjected to gravity acting on the sand in the raw water flowing in the separation channel. Can be separated satisfactorily, so that the height of the separation device can be reduced to achieve compactness. In addition, since the scraping device that accumulates the sand accumulated in the sand settling chamber of the sand settling device rotates in the horizontal plane in the sand settling chamber, the height of the sand settling device is reduced to achieve compactness. it can. For these reasons, it is possible to reduce the size of the sand-sediment separation facility in which the separator and the sand-sediment accumulation device are integrated, thereby realizing space saving.

In addition, since the separation flow path of the separation device has a spiral structure, gravity can act on the sand in the raw water flowing in the separation flow path, and centrifugal force can be applied. It can be separated from raw water even better.

According to the second aspect of the present invention, the slit of the separation channel of the separation device is formed in a spiral shape on the bottom surface of the separation channel along the outer peripheral wall of the separation channel in the centrifugal force acting direction. Thus, the separated sand can be dispersed and settled and deposited in the sand settling chamber of the sand settling device through this spiral slit.

  Further, since the bottom surface of the separation channel is configured as an inclined bottom surface that is inclined obliquely downward toward the slit, the sand separated in the separation channel can be concentrated and guided to the slit.

According to the third aspect of the present invention, since the storage hopper is connected vertically below the sand discharge port in the sand discharge chamber of the sand settling device, the sand accumulated in the sand settling chamber can be stored smoothly. Can be introduced into the hopper.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a sand sedimentation facility according to the present invention together with a storage hopper. FIG. 2 is a longitudinal cross-sectional view showing the sand sedimentation equipment of FIG.

  As shown in FIG. 1 and FIG. 2, the sand-sediment separation facility 10 is a united structure in which a separation device 11 is integrally disposed at the upper portion and a sand sediment collecting device 12 is integrally disposed at the lower portion. The separation device 11 separates the sand P mixed in the raw water, and the sand settling device 12 sinks and accumulates the sand P separated by the separation device 11 and guides it to the storage hopper 13. It is. The storage hopper 13 stores the sand P introduced from the sand settling device 12, and a sand discharge pipe to be described later below the sand discharge port 31 (both described later) in the sand settling chamber 25 of the sand settling device 12. 32 is connected.

  The separation device 11 separates the sand P from the separation flow path 15 that separates the sand P mixed in the raw water while the raw water supplied from the raw water transport pipe 14 flows at a low speed in the horizontal plane. It has a drainage flow path 17 for guiding the raw water by overflowing it toward the main drain pipe 16. As shown in FIG. 3, the separation flow path 15 is connected to the raw water transport pipe 14, and is connected to the deceleration flow path 18 for decelerating the raw water from the raw water transport pipe 14 and the deceleration flow path 18. And a spiral channel 19 configured in a spiral structure.

The decelerating channel 18 has a channel cross-sectional area larger than that of the raw water transport pipe 14 and decelerates the flow rate of the raw water flowing from the raw water transport pipe 14. Further, the spiral flow path 19 is formed in a spiral shape toward the center of the separation device 11, and a discharge port 20 that opens to the sand settling device 12 is formed in this central portion. The raw water decelerated in the deceleration channel 18 is introduced into the spiral channel 19 and gently flows in a spiral shape, flows into the sand settling device 12 through the discharge port 20 and a slit 21 described later, and overflows. the drain passage 17 is drained through the through Increment in the drain pipe 16.

  The slit 21 is formed in a spiral shape on the bottom plate 24 of the spiral flow path 19 along the peripheral wall 22 on the outer side in the centrifugal force acting direction in the spiral flow path 19 and is also continuous with the bottom plate 23 of the deceleration flow path 18. To form a straight line. Further, the bottom plate 23 of the deceleration channel 18 and the bottom plate 24 of the spiral channel 19 are configured as inclined bottom plates that are inclined obliquely downward toward the slit 21 as shown in FIG. A partition wall 38 is provided below the bottom plate 23 of the deceleration flow path 18 and the bottom plate 24 of the spiral flow path 19 to separate the separation device 11 and the sand settling device 12.

  Here, the symbols A and B in FIG. 2 indicate the flow direction of the raw water in the spiral flow path 19, the symbol A indicates that the raw water flows from the back side to the near side of the paper surface, and the symbol B is Indicates that raw water flows from the near side of the page toward the far side. 3, the flow direction of the raw water in the separation channel 15 is indicated by an arrow C.

  While the raw water flows loosely and spirally in the spiral flow path 19 as described above, the solid content (sand P) heavier than the fluid settles under the action of gravity, and the sand P is further spiraled under the action of centrifugal force. It is pushed out of the channel 19. The sand P in the raw water is separated from the raw water by the action of gravity and centrifugal force. The separated sand P is moved into the slit 21 along the peripheral wall 22 on the outer side in the centrifugal force acting direction of the spiral channel 19 by the action of the centrifugal force and the slope of the inclined bottom plate 24 in the spiral channel 19 and the action of gravity. Concentrate and fall from the slit 21 into the sand settling chamber 25 of the sand settling device 12. The dropping of the sand P from the slit 21 into the sand settling chamber 25 is carried out in a distributed manner along the spiral shape of the slit 21.

  The sand P in the raw water that could not fall from the slit 21 falls from the outlet 20 in the central portion into the sand settling chamber 25 of the sand settling device 12 because the bottom plate 24 disappears in the central portion of the spiral flow path 19.

  On the other hand, the sand settling device 12 sinks the sand P that has fallen from the slit 21 and the discharge port 20 of the separation device 21 and deposits it on the bottom surface 30, and a plurality of sheets disposed in the sand settling chamber 25. And a scraping device 39 provided with the blade 26. As shown in FIG. 4, a sand discharge port 31 is formed at the center of the bottom surface 30 of the sand settling chamber 25, and a sand discharge pipe 32 (FIG. 2) is connected to the sand discharge port 31.

The sand discharge pipe 32 is connected to the storage hopper 13 via a sand discharge valve (for example, a butterfly valve) 33 that can be opened and closed. Therefore, the sand discharge valve 33 is installed on the downstream side of the sand discharge port 31 of the sand settling chamber 25. Further, the sand discharge pipe 32 is connected to the main drain pipe 16 via the sub drain pipe 34 on the upstream side of the sand discharge valve 33, and a drain valve 35 that can be opened and closed is disposed on the sub drain pipe 34. . The sand discharge valve 33 enables the sand P in the sand settling chamber 25 to be introduced into the storage hopper 13 through the sand discharge port 31, the sand discharge pipe 32 and the sand discharge valve 33 during the opening operation. In addition, the drain valve 35 drains raw water stored in the separation device 11 and the sand settling device 12 to the main drain pipe 16 through the sub drain pipe 34 and the drain valve 35 during the opening operation.

  As shown in FIG. 4, the scraping device 39 includes a plurality of rotating arms 28 extending radially from the drive shaft 27, and one or a plurality of blades 26 are attached to the rotating arms 28. Is done. As shown in FIG. 2, the drive shaft 27 is installed through the separation device 11 and the sand settling device 12 at a central position of the separation device 11 and the sand settling device 12, and is connected to a drive motor 29. . Accordingly, when the drive motor 29 is activated, the rotary arm 28 rotates in a horizontal plane via the drive shaft 27, and one or more blades 26 attached to each rotary arm 28 are set in the horizontal plane in the sand settling chamber 25. Rotate. An arrow α in FIG. 4 indicates the rotation direction of the blade 26 in the horizontal plane. The blade 26 rotating in the horizontal plane scrapes the sand P accumulated on the bottom surface 30 of the sand settling chamber 25 toward the sand discharge port 31.

  2 and 4, reference numeral 36 is a bearing that supports the drive shaft 27, and reference numeral 37 is a stay that supports the bearing 36.

  When the drive motor 29 is stopped, the sand discharge valve 33 and the drain valve 35 are closed. In this state, raw water is supplied into the sedimentation facility 10, and the sand P in the raw water is separated by the function of the spiral flow path 19 of the separation device 11, and this sand P settles in the sand sedimentation chamber 25 of the sand collection device 12. Then, they are distributed and deposited on the bottom surface 30 thereof.

  After the supply of raw water to the sedimentation facility 10 is stopped, the drain valve 35 is first opened to store the raw water stored in the separation device 11 and the sedimentation accumulation device 12 and separated from the sand P into the sub drainage pipe 34. To the main drain 16 and drain. Next, the sand discharge valve 33 is opened, and the sand P stored in the sand discharge pipe 32 on the upstream side of the sand discharge valve 33 is dropped into the storage hopper 13. Thereafter, the drive motor 29 is activated to rotate the blade 26 of the scraping device 39 in a horizontal plane in the sand settling chamber 25, and the sand P accumulated on the bottom surface 30 of the sand settling chamber 25 is passed to the sand outlet 31 of the bottom surface 30. Accumulated, introduced into the storage hopper 13 via the sand discharge pipe 32, and stored in the storage hopper 13.

With the configuration as described above, the following effects (1) to ( 6 ) are achieved according to the above embodiment.
(1) Since the flow rate of the raw water is reduced in the separation channel 15 (the deceleration channel 18 and the spiral channel 19) of the separation device 11 and the spiral channel 19 is configured in a spiral structure, the separation channel Since the sand P in the raw water can be satisfactorily separated by the gravity and centrifugal force acting on the sand P in the raw water flowing in 15, the height H1 of the separation device 11 can be reduced to achieve compactness. Further, since the blade 26 of the scraping device 39 that accumulates the sand P accumulated in the sand settling chamber 25 of the sand settling device 12 in the sand discharge port 31 rotates in a horizontal plane in the sand settling chamber 25, Compared with the case where a screw conveyor or the like is provided, the height H2 of the sand settling device 12 can be reduced to achieve compactness. For these reasons, it is possible to reduce the size of the sand-sediment separation facility 10 in which the separation device 11 and the sand-sediment accumulation device 12 are integrated, thereby realizing space saving.

  (2) Furthermore, the height H1 of the separation device 11 and the height H2 of the sand settling device 12 are both reduced, so that it can be installed in an existing storage hopper, and related equipment such as a belt conveyor can be removed. Therefore, the degree of freedom of the layout structure including the sedimentation facility 10 and the storage hopper can be increased.

  (3) In the sand settling chamber 25 of the sand settling device 12, the sand P accumulated on the bottom surface 30 in the sand settling chamber 25 is moved by using the blade 26 of the scraping device 39 that rotates in a horizontal plane. The sand P can be efficiently moved to the sand discharge port 31 even in a state where the amount of accumulated sand in the sand settling chamber 25 is small compared to the case where the sand P is moved by, for example.

  (4) The slit 21 in the separation channel 15 (deceleration channel 18, spiral channel 19) of the separation device 11 is along the peripheral wall 22 on the outer side in the centrifugal force acting direction in the spiral channel 19. 24, and further formed continuously on the bottom plate 23 of the deceleration channel 18, the separated sand P is dispersed into the sand settling chamber 25 of the sand settling device through the spiral slit 21. Thus, the amount of sand P deposited in the sand settling chamber 25 can be increased.

  (5) Since the bottom plate 23 of the deceleration channel 18 and the bottom plate 24 of the spiral channel 19 are configured as an inclined bottom plate inclined obliquely downward toward the slit 21, the separation channel 15 (the deceleration channel 18, The sand P separated in the spiral channel 19) can be concentrated and guided to the slit 21.

  (6) Since the storage hopper 13 is connected via the sand discharge pipe 32 vertically below the sand discharge port 31 of the sand settling chamber 25 in the sand settling device 12, the sand P accumulated in the sand settling chamber 25 is retained. It can be smoothly introduced into the storage hopper 13 without any problems.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this. For example, in the above-described embodiment, the storage hopper 13 is described as being connected via the sand discharge pipe 32 to the vertically lower side of the sand discharge port 31 in the sand settling device 12 of the sand settling facility 10. 13 may be disposed below the sand discharge port 31 using an elbow pipe or a bend pipe.

  In the above embodiment, the scraping device may be a known scraping device other than the illustrated scraping device 39. For example, as shown in FIG. 5, instead of the rotary arm 28 and the blade 26 of the scraping device 39, two scraping members 41 curved in an S shape as a whole are directly attached to the drive shaft 27, The scraping device 40 that scrapes the sand P deposited on the bottom surface 30 of the sand settling chamber 25 by the clinging member 41 may be used.

It is a perspective view which shows one Embodiment of the sand-sediment separation equipment which concerns on this invention with the storage hopper. It is a longitudinal cross-sectional view which shows the sand sedimentation equipment of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing corresponding to FIG. 4 which shows the scratching apparatus different from the scratching apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sand settling equipment 11 Separation device 12 Sand settling device 13 Storage hopper 15 Separation flow path 16 Main drain pipe 17 Drain flow path 18 Deceleration flow path 19 Spiral flow path 20 Discharge port 21 Slit 25 Sand settling chamber 26 Blade 28 Rotating arm 31 Sand discharge Mouth 33 Sand discharge valve 35 Drain valve 39 Scratching device P Sand

Claims (3)

A separation device that separates the sand in the raw water supplied from the raw water transport pipe, and a sand settling device that sinks and accumulates the sand separated by this separation device and leads to the storage hopper are integrated in the upper and lower parts respectively. Arranged,
The separating device is connected into the water conveying pipe, is provided continuously to the deceleration flow path and the deceleration channel Ru slow down the flow rate of raw water supplied from the raw water transport pipe, raw water is decelerated at the deceleration channel Is provided on the bottom surface of the separation channel, the separation channel having a spiral channel having a spiral structure that separates sand from the raw water by the action of gravity and centrifugal force. A slit for dropping the sand separated when the raw water flows into the sand settling device, and the raw water from which the sand has been separated in the separation flow channel is formed in the central portion of the spiral flow channel with respect to the sand settling device. A drainage flow path that is caused to flow in from a discharge opening that is opened and overflows the inside of the sand settling device and leads to a drainage path ,
The sand settling device is provided below the separating device and deposits the sand dropped from the slit and the discharge port on the bottom surface, and has a sand discharge port formed at the center of the bottom surface. And a scraping device that rotates in a horizontal plane in the sand settling chamber and accumulates sand accumulated in the sand settling chamber at a sand discharge port of the sand settling chamber ,
A drain valve is installed in the sand settling chamber of the sand settling device, and a sand discharge valve is installed downstream of the sand settling port of the sand settling chamber,
These valves are opened when the supply of raw water to the separator is stopped, the raw water in the separator and the sand settling device is drained through the drain valve, and the sand in the sand settling chamber is drained and the sand outlet A sand settling facility characterized in that it can be introduced into a storage hopper via a sand discharge valve . The slit of the separation channel of the separation device is formed in a spiral shape on the bottom surface of the separation channel along the outer peripheral wall in the centrifugal force acting direction in the separation channel,
The sedimentation separation apparatus according to claim 1 , wherein the bottom surface of the separation channel is configured as an inclined bottom surface that is inclined obliquely downward toward the slit. The sand sediment separation according to claim 1 , wherein a storage hopper is connected vertically below the sand discharge port in the sand settling chamber of the sand settling device among the separation device and the sand settling device arranged integrally. Facility.

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