JP2013086056A - Deep aeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deep aeration device, which exhausts surplus air efficiently, without causing such a problem that a hose is exposed to water surface, without being entwined with the hose of an exhauster, in simple construction.SOLUTION: This deep aeration device is equipped with a device body, which is immersed in water, and can stand by itself, and an exhaust pipe, which is provided in this device body to discharge air within the device body. It is equipped with one or more passages which connect the upper part of the device body with outside of the device body, and one end of this passage faces an air layer in the upper part of the device body, and the other end is provided in a position which is lower than the reversed water surface in usual use.

Description

  The present invention relates to a deep aeration apparatus used for improving the water quality of a water layer in a water source reservoir such as a lake or a dam or a harbor.

  FIG. 8 is a conceptual diagram showing a conventional deep aeration apparatus 1 (see, for example, Patent Document 1). The deep aeration apparatus 1 is an apparatus that is moored in a lake 2 such as a dam lake and circulates deep water near the lake by aeration (see arrow a).

  The deep aeration apparatus 1 includes an apparatus body 4 that is held upright by the buoyancy of the float 3 while being anchored to the lake bottom 1 by a sinker 16. As shown in FIG. 8, in the deep aeration apparatus 1, the compressed air sent from the compressor through the air supply hose 5 becomes fine bubbles via the air diffuser 6 provided at the bottom of the apparatus body 4, and the apparatus inner cylinder 7 To rise. As the bubbles rise, the water in the deep layer also rises (arrow b). At this time, oxygen in the bubbles is dissolved in the deep water. The deep water in which oxygen is dissolved descends the device outer cylinder 8 and returns to the deep layer portion from the outlet 9 provided between the inner cylinder 7 and the outer cylinder 8 (arrow c). By repeating this operation, the anaerobic deep water can be aerobic, promoting the growth of benthic organisms (benthos), reducing the activity of reducing bacteria in the deep water, and suppressing the generation of hydrogen sulfide. .

  On the other hand, surplus air that is not dissolved out of the supplied air is accumulated in the air reservoir 10 at the upper part of the apparatus main body 4. This surplus air is discharged by the exhaust device 11 provided on the upper part of the device body 4. In the exhaust device 11, an exhaust hose 13 is connected to an exhaust float 12 that floats on the water surface. Also, the exhaust hose 13 needs to limit the amount of exhaust and keep the water surface in the upper part of the device. Is provided.

  A reversing water surface L2 is set in the air reservoir chamber 10 in the apparatus body 4. If the reversal water surface L2 is too low, the water with the increased dissolved oxygen amount cannot be reversed, and there is a possibility that it cannot be drained into the deep layer. On the other hand, if the reversal water surface L2 is too high, the water having an increased dissolved oxygen amount may be drained from the exhaust hose 12 to the water surface L1 through the exhaust valve 14. The reverse water surface L2 is set by adjusting the pressure of the compressed air and the exhaust valve 14.

  However, if the exhaust valve 14 is clogged with foreign matter, the exhaust hose 12 is entangled, or is kinked and cannot be exhausted, excess air cannot be discharged, and excess air accumulates in the apparatus body 4. As a result, the device body 4 suddenly rises.

  In order to solve these problems, an emergency exhaust hose 15 is provided as shown in FIG. The emergency exhaust hose 15 does not operate in a normal state. When surplus air in the apparatus 1 is accumulated to a certain level or more, it is exhausted through the emergency exhaust hose 15. The emergency exhaust hose 15 exposes the outlet end to the air surface, and joins the other end to the upper part of the device 1 so that the main body of the device 1 is submerged below the water surface. For this reason, there is a problem that the emergency device 11 becomes large and the exhaust hose 13 and the emergency exhaust hose 15 of the exhaust device 11 are entangled and difficult to exhaust. Moreover, when the amount of stored water decreases, the hose is exposed to the water surface or floats. In this case, there is a problem that the emergency exhaust hose 15 is damaged by floating foreign matters on the water surface.

  In addition, the present inventors have developed a shallow air diffuser in order to effectively use surplus air (see, for example, Patent Document 2). However, even in this case, the emergency exhaust hose has the same problem as described above.

JP 9-314173 A JP 2007-229662 A

  Therefore, the present invention provides a simple configuration, when there is a problem with the exhaust device for surplus air, without being entangled with the hose of the exhaust device, without causing the problem that the hose floats and is exposed on the surface of the water. An object of the present invention is to provide a deep layer aeration apparatus capable of exhausting excess air with certainty.

  As a result of earnestly examining the above problems, the inventors of the present invention have a deep aeration apparatus including an apparatus main body that can be immersed in water and can stand on its own, and an exhaust pipe that discharges air in the apparatus main body provided in the apparatus main body. And having one or more flow paths communicating between the upper part of the apparatus main body and the outside of the apparatus main body, one end of the flow path facing the air layer on the upper part of the apparatus main body, and the other end being normally used. The present invention was completed by finding that a deep aeration apparatus in which the forced exhaust hose is not exposed to the water surface can be obtained without being entangled with the exhaust apparatus hose with a simple configuration of being provided at a position lower than the reversing water surface at the time. .

  The flow path may be attached to the apparatus main body, or may be a part of the apparatus main body.

  The flow path may be provided inside the apparatus main body, may be provided outside the apparatus main body, or may be provided from inside the apparatus main body to outside the apparatus main body.

  The flow path may be connected via a chamber box.

  The deep aeration apparatus according to the present invention includes one or more flow paths that communicate between the upper part of the apparatus main body and the outside of the apparatus main body. One end of this flow path faces the air layer above the apparatus main body, and the other end is provided at a position lower than the reversal water surface during normal use. Thus, the configuration of the exhaust path of the present invention is simple. Further, with this configuration, when the excess air increases to a position lower than the outlet of the exhaust passage in the apparatus, the excess air can be efficiently discharged. Moreover, since it is not necessary to provide the outlet of the hose up to the surface of the water, there is no problem of being entangled with the hose of the exhaust device.

  Further, in the deep aeration apparatus of the present invention having a structure having an exhaust hose that communicates with the water surface, the air discharged during emergency exhaust rises into the water as water bubbles. For this reason, if the water surface is observed and water bubbles are observed, it can be easily grasped that a large amount of excess air is generated in the deep aeration apparatus. Thereby, it can be understood that some abnormality has occurred in the apparatus. That is, in the deep layer aeration apparatus of the present invention, it is possible to detect that a large amount of surplus air is generated in the apparatus without providing any detection means.

FIG. 1 is a cross-sectional view of an essential part showing an example of a deep layer aeration apparatus of the present invention in which a flow path is provided. FIG. 2 is a diagram for explaining the function of the flow path of the present invention. FIG. 3 is a diagram showing an example of a flow path in the deep aeration apparatus of the present invention. FIG. 4 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. FIG. 5 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. FIG. 6 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. FIG. 7 is a diagram showing an example in which the outer cylinder of the apparatus constitutes a flow path in the deep aeration apparatus of the present invention. FIG. 8 is a conceptual diagram showing a conventional deep layer aeration apparatus 1.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing an example of a deep layer aeration apparatus 21 of the present invention in which a flow path is provided. In the example of this figure, the apparatus main body 24 that can be self-supported by being immersed in water is connected to the exhaust pipe 23 for discharging the air in the apparatus main body, and the upper part of the apparatus main body 24 and the outside of the apparatus main body 24 are communicated. The flow path 25 is provided. Other configurations are the same as those shown in FIG. In the present invention, this channel is used to perform emergency exhaust when an exhaust failure occurs in the exhaust pipe.

  One end 26 of the flow path 24 faces the air layer 30 above the apparatus main body 24, and the other end 27 is provided at a position lower than the reversal water surface L2 during normal use. In the deep aeration apparatus 22 having a multi-tube structure, the water introduced into the central tube or the peripheral part of the apparatus moves while being reversed from the inner cylinder 28 to the outer cylinder 29 or from the outer cylinder 29 to the inner cylinder 28. In the example of this figure, the water introduced into the central tube of the apparatus moves while being reversed from the inner cylinder 27 to the outer cylinder 28.

  Moreover, in order to mix water and air efficiently, compressed air is introduced from the lower part of the apparatus. In order to invert the mixed water efficiently, an air layer 30 is formed on the upper part of the apparatus main body 24. One end 26 of the flow path 25 faces the air layer 30 above the apparatus main body 24. A reverse water surface L2 is formed at the boundary between the air layer 24 and the water layer. The other end 27 of the flow path 25 is provided at a position lower than the reverse water surface L2 during normal use. The position of the reversal water surface L2 is adjusted by adjusting the pressure of the air exhausted by adjusting the valve 22 provided at the tip of the exhaust pipe 23 for discharging the air in the apparatus main body 24 and the pressure of the compressed air to be supplied. Determine the appropriate position within 24. For example, when the position of the reverse water level L2 is high, water is discharged from the exhaust pipe 23. In this case, the supply amount of air is increased and the position of the reverse water level L2 is lowered. On the other hand, when the position of the reverse water level L2 is low, air is discharged from the flow path 25. When discharging air, observe that water bubbles are generated from the water surface. In this case, the amount of air supply is reduced and the position of the inversion water level L2 is increased. The position of the inverted water level L2 is controlled by a control valve 22 provided in the exhaust device.

  In the present invention, unless the air flows out from the other end 27 of the flow path 25 of the present invention, the water level of the reversal water surface L2 inside the apparatus and the water level of the water that has entered the flow path 25 from the other end 27 of the flow path 25 are substantially the same. Is used. FIG. 2 is a diagram for explaining the function of the flow path of the present invention. Fig.2 (a) is a figure which shows the state at the time of normal operation in the deep layer aeration apparatus which provides a flow path. In the example of this figure, the water level L2 of the reverse water surface L2 during normal operation and the water level L3 of water that has entered the flow channel 25 from the other end 27 of the flow channel 25 are substantially the same. FIG. 2B is a diagram illustrating a state in which the exhaust path has started to cause exhaust failure due to kinking or the like. As shown in FIG. 2B, the air layer 30 in the apparatus main body 24 is increased, the water level of the reversal water surface L2 is lowered, and the water level L3 that has entered the flow path 25 from the other end 27 of the flow path is also lowered. In the example of this figure, the water levels of L2 and L3 are lower than in the case of FIG. As shown in FIG. 2 (c), when the exhaust failure further progresses, and surplus air in the apparatus further increases and the water level of the reversal water surface L2 falls below the opening of the other end 27 of the flow path, Excess air is discharged from the other end 27. Excess air from the other end 27 of the flow path is discharged until the water level of the reversal water surface L2 rises to at least the opening of the other end 27 of the flow path. Thereafter, when the discharge failure is resolved and normal operation is started, the water level L3 of the reverse water surface L2 and the water level L3 that has entered the flow path 25 from the other end 27 of the flow path return to the state of FIG.

  In the present invention, one end 26 of the flow path 25 is provided on the upper surface or the upper side of the apparatus main body 24. One end 26 of the flow path 25 opens at a site where excess air exists during initial setting or normal operation. The other end 27 of the flow path 25 is a portion below the position below the reversal water surface L2 at the time of initial setting or normal operation, where excess air accumulates excessively in the air layer 10 and the deep aeration apparatus 22 does not rise. Is open. Therefore, the other end 27 of the flow path 25 is provided at a position lower than the position where the one end 26 of the flow path 25 is provided in the apparatus main body 24. The positions where the one end 26 and the other end 27 of the flow path 25 are provided are arbitrarily set according to the size (volume, height of the entire apparatus, height of the inner cylinder, inner diameter, etc.) of the aeration apparatus and the processing amount. Can do.

  In the present invention, the shape, structure, number, etc. of the flow channel are not particularly limited as long as the flow channel 25 has the above function. The flow path 25 may be provided outside or inside the apparatus main body 24, and a part of the apparatus main body 24 may constitute the flow path 25.

  The flow path may be provided with a tubular object such as a hose shape, a pipe shape, or a duct shape in the apparatus main body. FIG. 3 is a diagram showing an example of a flow path in the deep aeration apparatus of the present invention. In the example of this figure, tubular objects such as a hose shape, a pipe shape, and a duct shape are provided outside the apparatus main body. As shown to Fig.3 (a), when providing a flexible tubular thing like a hose shape, it is good also as fixing to the wall surface of an apparatus main body. In addition to the example of this figure, a hole may be formed in the upper part or upper part of the apparatus main body, and a pipe or the like may be fixed in this hole.

  FIG. 4 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. In the example of this figure, tubular objects such as a hose shape, a pipe shape, and a duct shape are provided inside the apparatus main body. As shown in the example of FIG. 4A, a configuration may be adopted in which a hole is formed in the upper portion of the apparatus main body 24 and a bent tubular object is attached. Moreover, as shown in the example of FIG. 4B, a plurality of holes may be formed in the upper portion of the apparatus main body 24, and a tubular object having a branch pipe may be connected between the holes. In this case, the branch pipe opens into the air layer.

  FIG. 5 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. In the example of FIG. 5, the channel has a tubular structure formed by fixing a member to a wall surface. In the example of FIG. 5, a semi-cylindrical member is fixed to the inner wall of the apparatus to form a flow path. As a member to be fixed to the wall surface, for example, a half tube such as a half cylinder, a half prism (V shape, U shape, etc.), a U shape column, or the like is used.

  FIG. 6 is a diagram showing another example of the flow path in the deep aeration apparatus of the present invention. The flow path may not be a continuous annular object or a half tube. For example, as shown in FIG. 6, a plurality of tubular objects or half tubes may be connected by a chamber box 31 such as a connector.

  FIG. 7 is a diagram illustrating an example in which the outer cylinder of the apparatus forms a flow path. In the example of this figure, the outer cylinder 28 of the apparatus main body 24 is formed by an upper portion 28a and other members 28b. The inner diameter of the upper portion 28a of the outer cylinder 28 is larger than the outer diameter of the other members 28b, and the upper portion 28a of the outer cylinder 28 and the other members 28b are fitted. For example, when fitting both the upper part 28a of the outer cylinder 28 and the other member 28b, one or more flow paths can be obtained so that the inner surface of the upper part 28a of the outer cylinder 28 or the other member 28b can be obtained. A groove is formed on the outer surface. The joining method may be a known method as long as it provides a strength that can be used safely when installed on the water bottom. The flow path according to this example is formed in a space between the upper part of the apparatus main body and other members.

  In the present invention, the flow path 25 that communicates the upper portion of the apparatus main body 24 and the outside of the apparatus main body may be provided by one or more as long as it can effectively discharge excess air. When the flow path 25 has a tubular structure, the flow path 25 may be composed of a plurality. When there are a plurality of flow paths, excess air can be discharged even if one flow path is blocked for some reason. Further, by arranging a plurality of flow paths uniformly around the apparatus main body, excess air can be discharged in a well-balanced manner.

  In the present invention, the deep aeration apparatus provided with the flow path is not limited to the example shown in FIG. 1, and can be widely applied to an apparatus in which an air layer is formed on the upper part of the apparatus main body. For example, the flow path concerning this invention can also be provided in the hole after removing the emergency exhaust hose of the deep layer aeration apparatus provided with the well-known emergency exhaust hose. Moreover, the flow path concerning this invention can also be provided in a well-known deep layer aeration apparatus. For example, a flow path according to the present invention may be further provided in the shallow aeration apparatus described in Japanese Patent Application Laid-Open No. 2007-229662 and Japanese Patent Application Laid-Open No. 2011-98265. The present invention is not limited to the double pipe structure, and can be applied regardless of the structure as long as it is a deep layer aeration apparatus having a structure in which excess air accumulates in the upper part of the apparatus main body. For example, the single tube structure described in Japanese Patent Application Laid-Open No. 2003-220396 may be used, and the apparatus may have a multiple tube structure. That is, the deep aeration apparatus provided with the flow path according to the present invention can be applied to all types of deep aeration apparatuses as long as the air layer is formed in the apparatus.

  If the deep layer aeration apparatus of the present invention is used, excess air can be efficiently discharged with a simple configuration. Moreover, even if there is no channel provided outside, it is extremely short. As a result. As in the case of using a conventional emergency exhaust hose, there is no problem that the emergency exhaust hose stops functioning due to sticking or the like. Also, even if the water level in the lake or the like falls, no adjustment is necessary.

DESCRIPTION OF SYMBOLS 1 Deep layer aeration apparatus 2 Lake bottom 3 Float 4 Apparatus main body 5 Air supply hose 6 Air diffuser tube 7 Inner cylinder 8 Outer cylinder 9 Outlet 10 Air reservoir chamber 11 Exhaust device 12 Exhaust float 13 Exhaust hose 14 Exhaust valve 15 Emergency exhaust hose 16 Sinker 21 Deep layer Aeration device 23 Exhaust pipe 24 Device body 25 Flow path 26 One end 27 The other end 28 Inner tube 29 Outer tube 30 Air layer 31 Chamber box

Claims (4)

A deep aeration apparatus comprising a device main body that can be immersed and self-supported in water, and an exhaust pipe that discharges air in the device main body provided in the device main body,
One or more flow paths communicating the upper part of the apparatus main body and the outside of the apparatus main body, one end of the flow path facing the air layer on the upper part of the apparatus main body, and the other end of the reverse water surface during normal use A deep aeration device provided at a lower position. The deep aeration apparatus according to claim 1, wherein the flow path is attached to the apparatus main body or is a part of the apparatus main body. The deep aeration apparatus according to claim 1 or 2, wherein the flow path is provided in the apparatus main body, provided outside the apparatus main body, or provided from the apparatus main body to the outside of the apparatus main body. The deep channel aeration apparatus according to claim 1, wherein the flow path is connected via a chamber box.

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