JP5597496B2 - Deep aeration equipment - Google Patents

Description

  The present invention relates to a deep aeration apparatus.

  Conventionally, as shown in FIGS. 11 (a) and 11 (b), an exhaust pipe 3 and an emergency pipe are attached to an upper part of an aeration body 2 that is moored on a lake bottom 1 such as a dam lake and circulates deep water near the lake bottom 1 by aeration. An exhaust pipe 4 is provided, and in the normal state, excess air accumulated in the air reservoir chamber 5 in the aeration main body 3 is exhausted to the outside through the exhaust pipe 3, and in an emergency, the air reservoir chamber 5 in the aeration main body 3 is exhausted. There is a deep aeration apparatus A that exhausts the excess air accumulated in the outside through an emergency exhaust pipe 4 (see Patent Document 1).

  In this deep layer aeration apparatus A, the exhaust pipe 3, the emergency exhaust pipe 4 and the return pipe 10 of the aeration body 2 are connected to the floating exhaust body 7 floating on the water surface 6 through flexible hoses 8, 9, and 11, respectively. ing.

  Further, in the deep aeration apparatus B shown in FIGS. 12A and 12B, the exhaust pipe 3 and the return pipe 10 of the aeration main body 2 are connected to the floating exhaust body 7 floating on the water surface 6 via the flexible hoses 8 and 11. Each connected structure is the same as that of the deep aeration apparatus A (see Patent Document 2).

  However, as a configuration different from the deep aeration apparatus A, a valve (corresponding to an emergency exhaust pipe) 12 (A, B) capable of flowing in and out by a differential pressure inside and outside the aeration body 3 is provided on the upper side of the aeration body 3. It is that.

  When there is a pressure difference between the inside and outside of the aeration body 3, the fluid flows into the inside of the aeration body 3 through the valve 12 (A), or the fluid flows from the inside of the aeration body 3 to the valve 12 ( It flows out to the outside via B), and the pressure difference between the inside and outside of the aeration main body 3 is eliminated, and an equilibrium state is obtained.

  Specifically, when the exhaust pipe 3 is clogged or its exhaust capacity is exceeded, an excess amount of air accumulates in the air reservoir chamber 5, and the aeration main body 3 rapidly rises and jumps out of the water surface 6 due to an increase in buoyancy. The air in the atmosphere flows into the aeration body 3 through 12 (A), so that the aeration body 3 is not deformed or broken.

  By the way, since the exhaust pipe 3 and the emergency exhaust pipe 4 of the former deep layer aeration apparatus A are connected to the floating exhaust body 7 on the water surface 6 through flexible hoses 8 and 9 that are bound in parallel, the aeration main body 3 Is installed at a water depth of 10 to 30 m, for example, the flexible hoses 8 and 9 having a length of 10 to 30 m may be simultaneously blocked by twisting or breaking, and thus the reliability of emergency exhaust by the emergency exhaust pipe 4 is lacking. There is a problem.

  In addition, the flexible hose 9 of the emergency exhaust pipe 4 may float on the water surface 6 due to a drop in the water surface 6 such as a dam lake, and there are many troubles such as damage caused by floating materials such as driftwood. There is a problem of lack of certainty of emergency exhaust.

  Furthermore, since the lower end 4a of the emergency exhaust pipe 4 is always in the water, it is exposed to the upward flow from the bottom during the operation of deep aeration, so it may be clogged with dust sucked from the lower layer, There is a problem that the reliability of emergency exhaust by the emergency exhaust pipe 4 is lacking.

  That is, the emergency exhaust valve 4 is opened for emergency exhaust in order to prevent the aeration body 3 from being damaged in an emergency when the exhaust valve 3 has a failure, and such an emergency rarely occurs in reality. It is not a thing. However, if the certainty of emergency exhaust is not guaranteed under any circumstances, the meaning of emergency exhaust is lost.

  And if the valve (equivalent to an emergency exhaust pipe) 12 which can flow in and out by the pressure difference inside and outside the aeration main body 3 like the latter deep layer aeration apparatus B is provided, the former caused by the flexible hose 9 and the like A problem such as the deep aeration apparatus A can be solved temporarily.

  In the latter deep aeration apparatus B, as shown in FIG. 12 (b), the hinge type valve 12 (A) that flows in fluid and the hinge type valve 12 (B) that flows out fluid are aerated by the pressure difference inside and outside. It is provided on the upper side of the main body 3. Further, as shown in FIG. 12C, a ball type valve 12 (C) that flows in fluid and a ball type valve 12 (D) that flows out fluid due to differential pressure inside and outside are provided at the upper end of the aeration body 3. Some are provided.

JP-A-9-314172 Japanese Patent Laid-Open No. 9-314175

  However, the aeration main body 3 of the deep aeration apparatus B is installed at a water depth of 10 to 30 m, for example. Therefore, since it is necessary to open and close the valve 12 (A to D) due to the depth of the water and the pressure difference inside and outside the atmosphere, it is difficult to adjust the opening and closing pressure, and the reliability of emergency exhaust by the valve 12 (A to D) is increased. The problem of lacking has not been solved.

  In addition, since the valve 12 (A to D) has a portion that directly faces the outside of the aeration main body 3, that is, in the dam lake, there is a possibility that floating parts such as dust and sand may be clogged in the operation part, and may not operate. Or since floating substances such as fallen leaves and plastic bags may block the opening of the valve 12 (A to D), the problem of lack of certainty of emergency exhaust by the valve 12 (A to D) has not been solved.

  Further, the hinge type valve 12 (A, B) has a drawback that the sensitivity is changed or becomes dull due to rusting of the hinge part. In the ball type valve 12 (C, D), the rusting of the spring or secular change, There is a drawback that the sensitivity changes or becomes dull due to repeated operation. Such a mechanical opening / closing mechanism has a problem that it easily breaks down because it is used underwater.

  The present invention has been made in order to solve the above-mentioned problems, and is a deep aeration capable of always assuring the certainty of emergency exhaust through the emergency exhaust pipe without any influence of the differential pressure inside and outside of the aeration main body or the suspended matter. The object is to provide an apparatus.

  In order to solve the above problems, the present invention is provided with an exhaust pipe and an emergency exhaust pipe on the upper part of an aeration body which is moored on a lake bottom such as a dam lake and circulates deep water near the lake bottom by aeration. During normal operation, excess air collected in the air reservoir chamber in the aeration body is exhausted to the outside through an exhaust pipe. In an emergency, excess air collected in the air reservoir chamber in the aeration body is exhausted to the outside through an emergency exhaust pipe. The emergency exhaust pipe has a top end faced near the outside of the aeration main body, a lower end opening below the lower end opening of the exhaust pipe, and a normal air reservoir chamber in the aeration main body. A float valve that faces below the water level at the time and moves up and down according to the fluctuation of the water level in the aeration body is faced at the lower end of the emergency exhaust pipe. Buoyancy during normal times higher than the bottom opening Provided is a deep aeration apparatus characterized by closing the bottom end of the emergency exhaust pipe and opening the bottom end of the emergency exhaust pipe in an emergency when the water level is lower than the height of the bottom end of the emergency exhaust pipe To do.

  The float valve can be configured such that the vertical movement is guided by a guide member attached to a baffle plate in the aeration body or the emergency exhaust pipe itself.

  According to a third aspect of the present invention, the upper end port of the emergency exhaust pipe may be curved downward in an inverted U shape.

  According to a fourth aspect of the present invention, the exhaust pipe can serve as an air diffuser that diffuses excess air accumulated in the air reservoir chamber into the water.

  According to the present invention, the emergency exhaust pipe has the upper end facing the vicinity of the outside of the aeration body, and the lower end is exposed below the normal water level of the air reservoir in the aeration body. A float valve that moves up and down in response to fluctuations in the water level in the aeration body faces the lower end.

  And the float valve in the aeration main body is stored in the air reservoir chamber in the aeration main body by closing the lower end opening of the emergency exhaust pipe with buoyancy when the water level is higher than the height of the lower end opening of the emergency exhaust pipe. Air is discharged into the water only from the upper end of the exhaust pipe. When the water level is lower than the height of the bottom end of the emergency exhaust pipe, the float valve also drops according to the water level, and the bottom end of the emergency exhaust pipe is opened to collect in the air reservoir in the aeration body. Excess air is urgently discharged into the water from the upper end.

  Therefore, in an emergency where the exhaust valve has a failure, the excess air in the aeration body is urgently discharged to the outside, so that the aeration body can be prevented from suddenly rising, deformation, or breakage.

  And since the flexible hose like the former deep layer aeration apparatus A of the background art is unnecessary, there is a risk of blockage due to twisting or bending, troubles such as damage due to floating materials such as driftwood, dust sucked in from the lower layer, etc. There is no risk of clogging.

  Moreover, since the structure is such that the float valve in the aeration body is opened and closed by raising and lowering the water level instead of the structure in which the valve is opened and closed by a differential pressure inside and outside like the latter deep layer aeration apparatus B of the background art, adjustment of the opening and closing pressure Is unnecessary, and the reliability of emergency exhaust is improved.

  Unlike the latter deep aeration apparatus B of the background art, this float valve has no place directly facing the outside of the aeration body, that is, inside the dam lake, and is located in the aeration body. Since there is no risk of clogging of the operating portion and floating matter such as fallen leaves or plastic bags blocking the opening of the valve, the reliability of emergency exhaust is also improved in this respect.

  In this way, there is no influence of the differential pressure inside and outside the aeration main body or floating substances, and the reliability of emergency exhaust can always be guaranteed.

  Moreover, since the float valve has a simple configuration that moves up and down by buoyancy according to the water level and opens and closes the lower end port of the emergency exhaust pipe, it does not easily fail even when used underwater for a long period of time.

  According to the second aspect, by guiding the vertical movement of the float valve, the float valve accurately opens and closes the lower end of the emergency exhaust pipe.

  According to the third aspect, since the upper end port of the emergency exhaust pipe is bent downward in an inverted U shape, there is no possibility that dust, sand, etc. floating in the water will enter the aeration body and accumulate.

  According to the fourth aspect, since the exhaust pipe also serves as an air diffuser, if the excess air accumulated in the air reservoir chamber is diffused into the water, the water in the surface layer is effectively agitated. Algae generation can be suppressed, and it will function as a combined deep aeration apparatus.

It is side surface sectional drawing of the composite type deep aeration apparatus of embodiment of this invention. It is the aeration apparatus of FIG. 1, and is a principal part expanded side surface sectional view at the time of valve closing of the float valve of 1st Embodiment. It is the aeration apparatus of FIG. 1, and is a principal part expanded side surface sectional view at the time of valve opening of the float valve of 1st Embodiment. It is a top view of the float valve and guide member of a 1st embodiment. It is a float valve of a 1st embodiment, (a) is a top view, (b) is a side view of (a), (c) is a top view of a modification, and (d) is a side view of (c). . It is the aeration apparatus of FIG. 1, and is a principal part expanded side surface sectional view which shows the guide member of a modification. 1. It is the aeration apparatus of FIG. 1, (a) is a principal part expanded side sectional view which shows the float valve of a modification, (b) is a top view of the float valve and guide member of (a). It is the aeration apparatus of FIG. 1, and is a principal part expanded side surface sectional view at the time of valve closing of the float valve of 2nd Embodiment. It is the aeration apparatus of FIG. 1, and is a principal part expanded side surface sectional view at the time of valve opening of the float valve of 2nd Embodiment. (A) is a top view of the float valve of 2nd Embodiment, (b) is a side view of a float, (c) is a side view of the float of a modification. It is the deep layer aeration apparatus of patent document 1, (a) is side sectional drawing, (b) is a principal part expanded side view. It is a deep layer aeration apparatus of patent document 2, (a) is side sectional drawing, (b) is a principal part expanded side view, (c) is a principal part expanded side view of the modification of a valve.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view of a composite type deep aeration apparatus 15 according to an embodiment of the present invention.

  The aeration apparatus 15 is moored to a lake bottom 16 such as a dam lake and circulates deep water near the lake bottom by aeration (see arrow a).

  The aeration apparatus 15 includes an aeration body 19 that is held upright by the buoyancy of the float 18 while being anchored to the lake bottom 16 by a sinker 17. Then, water c that has absorbed water into the inner cylinder 22 by the upward flow b of the aeration from the first air diffuser 21 due to the compressed air sent from the air supply pipe 20 and has increased the amount of dissolved oxygen is supplied to the upper end of the inner cylinder 22. The baffle plate 23 supported by a plurality of stays 23a (see FIG. 2) is inverted from above to below. Thereafter, draining from the outlet 25 between the outer cylinder 24 to the outside (deep layer) prevents the deep layer from becoming anaerobic.

  The top portion of the outer cylinder 24 is formed in a hemispherical shape, and an air reservoir chamber 26 is formed between the baffle plate 23 at the upper end portion of the inner cylinder 22 to store surplus air d (see dots in FIG. 2). At the top of the outer cylinder 24, an exhaust pipe 30 that also serves as a second air diffuser pipe that penetrates into and out of the water in order to diffuse excess air d in the air reservoir chamber 26 into the water is provided.

  In addition, an emergency exhaust pipe 31 is provided at the top of the outer cylinder 24 to open when the air pressure in the air reservoir chamber 26 is abnormally increased and to urgently exhaust the excess air d into the water.

  The diffuser pipe 30 and the emergency exhaust pipe 31 are reinforced by a trapezoidal support plate 40 at the top of the outer cylinder 24 as shown in FIG. A cylindrical reinforcing cylinder 41 is attached to the inner surface of the top portion of the outer cylinder 24 so as to surround the diffuser pipe 30 and the emergency exhaust pipe 31, and the diffuser pipe 30 and the emergency exhaust pipe 31 are attached by the reinforcing cylinder 41. The top of the outer cylinder 24 is reinforced. A through hole 41 a is formed at the upper end of the reinforcing cylinder 41.

  Returning to FIG. 1, a downwardly conical skirt portion 27 is formed at the lower end portion of the inner cylinder 22 of the aeration body 19.

  Below the skirt portion 27, an upward hollow conical shape (sharpened cone) in which a plurality of air diffusion holes 21 a are formed near the top of the outer surface facing the inner surface of the skirt portion 27 with a certain gap therebetween. ) First air diffuser 21 is disposed.

  The air supply pipe 20 is connected to the lower part of the first air diffusion pipe 21, and the air supplied from the air supply pipe 20 to the first air diffusion pipe 21 is bubbled g to be continuously ejected from each air diffusion hole 21 a.

  The skirt portion 27 of the inner tube 22 and the first air diffuser 21 are substantially circumferentially arranged so that the inner surface of the skirt portion 27 of the inner tube 22 and the outer surface of the first air diffuser tube 21 face each other with a certain gap. They are connected by a bending connector 28 such as a chain at equal angular intervals (120 degrees in this example). Further, the first air diffuser 21 is anchored to the sinker 17 of the water bottom 16 by a mooring tool 29 that bends like a chain at substantially equal angular intervals on the circumference.

  In this case, the aeration body 19 including the inner cylinder 22 is given buoyancy by the float 18. Therefore, the connecting tool 28 such as a chain and the mooring tool 29 are pulled upward, so that the inner surface of the skirt portion 27 of the inner cylinder 22 and the outer surface of the first air diffuser 21 are particularly connected by the connecting tool 28. A certain gap is separated.

  The surplus air d accumulated in the air reservoir chamber 26 is diffused into the water from the exhaust pipe 30 that also serves as the second air diffuser, so that a water flow e due to air diffused is generated on the surface layer of the dam lake or the like (circulation aeration stirring) ) By effectively using the surplus air d, the surface layer near the water surface L1 can be agitated to make the water temperature uniform, and the generation of algae such as sea lions in the surface layer can be suppressed.

  The exhaust pipe 30 is not necessarily required to also serve as the second diffuser pipe, and can be connected to a floating exhaust body floating on the water surface via a flexible hose, as in the case of the deep aeration apparatuses A and B of the background art.

  As shown in detail in FIG. 2, the air reservoir chamber 26 between the top inner surface of the outer cylinder 24 and the upper surface of the baffle plate 23 is normally above the reversing water surface L <b> 2 at approximately half the height. The excess air d is set to accumulate. Further, in an emergency, as shown in FIG. 3, the surplus air d is accumulated up to the vicinity of the upper surface of the baffle plate 23 by pushing down the reverse water surface L <b> 2 ′ with the air pressure of the surplus air d.

  The upper end port 30 a of the exhaust pipe 30 that also serves as the second air diffuser pipe is set to a length that slightly protrudes upward from the top portion of the outer cylinder 24, and the lower end port 30 b is slightly lower than the top portion of the outer cylinder 24. It is set to the length which protrudes and is located above the reversal water surface L2 at the normal time. Note that the exhaust pipe 30 that also serves as the second air diffusion pipe may be a hole formed in the top of the outer cylinder 24.

  And, when the surplus air d accumulated in the air reservoir chamber 26 is diffused into the water from the exhaust pipe 30 which also serves as the second air diffuser, this inverted water surface L2 is maintained.

  Further, the upper end port 31 a of the emergency exhaust pipe 31 protrudes slightly upward from the top of the outer cylinder 24 and is set to have a length that curves downward in an inverted U shape, and the lower end port 31 b is formed on the exhaust pipe 30. The length is set to be lower than the lower end opening 30 b and below the normal reversal water surface L <b> 2 of the air reservoir chamber 26 and to protrude to the front of the baffle plate 23.

  A float valve 33 (A, B) that moves up and down in response to fluctuations in the inversion water surfaces (water levels) L2 and L2 ′ in the aeration body 19 is exposed to the lower end 31b of the emergency exhaust pipe 31.

  The float valve 33 (A, B) has a reverse water surface (water level) L2 that is higher than the height of the lower end port 31b of the emergency exhaust pipe 31 at normal times, as shown in FIG. Is closed, and the reverse water surface (water level) L2 ′ is lower than the height of the lower end 31b of the emergency exhaust pipe 31, as shown in FIG. 3, according to the reverse water surface L2 ′ and the float valve 33 (A , B) due to the involvement of its own weight, the lower end 31b of the emergency exhaust pipe 31 is opened.

  The float valve 33 (A, B) guides the vertical movement by the guide member 34 attached to the baffle plate 23 in the aeration body 19 or the emergency exhaust pipe 31 itself, so that the lower end 31b of the emergency exhaust pipe 31 is accurately Need to open and close.

  Therefore, among the float valve 33 (A) and the guide member 34 of the first embodiment, the float valve 33 (A) is cut at both ends at 45 degrees as shown in FIGS. Each hollow circular tube is connected in a square shape, and a flat valve plate 33a is connected to the upper surface thereof. The hollow circular tube is filled with buoyant air or foam.

  Further, as shown in FIG. 4, the guide member 34 is a member in which a rectangular base plate 34 b in which guide bars 34 a are erected at a plurality of locations (four locations in this example) on the upper surface is fixed to the upper surface of the baffle plate 23.

  Then, by inserting the float valve 33 (A) between the guide rods 34a, the vertical movement of the float valve 33 (A) is guided by the guide rods 34a.

  The float valve 33 (A) does not need to be formed by connecting four hollow circular tubes in a square shape, and the bottom surface of one ring-shaped circular tube is formed as a plate as shown in FIGS. 5 (c) and 5 (d). In addition to closing with 33b, the upper surface may be closed with a valve plate 33a, and the ring-shaped circular tube may be filled with buoyant air or foam.

  7 (a) and 7 (b), a buoyant hollow spherical float valve 33 (A) may be used. In this case, a round base plate 34b is used as the guide member 34. The guide bars 34a may be provided upright at a plurality of locations (three locations in this example) on the upper surface.

  Further, the guide member 34 is not limited to the one fixed to the upper surface of the baffle plate 23, and as shown in FIG. 6, the guide member 34 is provided at a plurality of locations (for example, four locations) at substantially equal angular intervals on the circumference of the emergency exhaust pipe 31. By fixing the upper end of the U-shaped guide rod 34c and inserting the float valve 33 (A) between the guide rods 34c, the float valve 33 (A) is moved up and down by each guide rod 34c. You may make it guide.

  As shown in FIGS. 10 (a) and 10 (b), the float valve 33 (B) of the second embodiment has three cylindrical floats having buoyancy by opening a slight gap in the outer peripheral surface of the emergency exhaust pipe 31. 33e are arranged at substantially equal angular intervals on the circumference (120 degrees in this example). The float 33e may have a spherical shape at the upper and lower ends as shown in FIG.

  Then, the vicinity of the lower end portion of each float 33e is fixed to the arc-shaped three sides 33h of the substantially hexagonal valve plate 33f in plan view, and the vicinity of the upper end portion of each float 33e is connected to three substantially square shapes. Each plate is fixed with 31 g.

  As shown in FIG. 8, the float valve 33 (B) has a buoyancy in which the reversing water surface (water level) L <b> 2 is higher than the lower end 31 b of the emergency exhaust pipe 31. When the valve plate 33f is closed and the emergency water level (water level) L2 ′ is lower than the height of the lower end 31b of the emergency exhaust pipe 31, as shown in FIG. 9, according to the reverse water level (water level) L2 ′, In addition, since the dead weight of the float valve 33 (A, B) is also involved, the lower end port 31b of the emergency exhaust pipe 31 is opened. At this time, the float plate 33 (B) is connected to the emergency exhaust pipe by the connection plate 31 g being held against the downward movement restricting rod 31 f (see FIG. 10B) protruding laterally from the outer peripheral surface of the emergency exhaust pipe 31. It is regulated so as not to fall downward from 31. In the type having the baffle plate 23, the baffle plate 23 restricts the float valve 33 (B) from dropping downward from the emergency exhaust pipe 31, so the downward movement restriction rod 31 f is unnecessary.

  In the float valve 33 (B) of the second embodiment, the emergency exhaust pipe 31 is used as a guide for vertical movement. A guide member 34 such as the float valve 33 (A) of the first embodiment is not necessary.

  In the case of the deep aeration apparatus 15 configured as described above, the emergency exhaust pipe 31 has the upper end 31a facing the vicinity of the outside of the aeration main body 19 and the lower end 31b at the normal time of the air reservoir chamber 26 in the aeration main body 19. Float valve 33 (A, which moves up and down according to the fluctuation of reversal water surfaces (water levels) L2 and L2 'in the aeration body 19 at the lower end 31b of the emergency exhaust pipe 31 B)

  The float valve 33 (A, B) in the aeration body 19 has a reversal water surface (water level) L2 that is higher than the lower end 31b of the emergency exhaust pipe 31 at a normal time. By closing 31 b, excess air accumulated in the air reservoir chamber 26 in the aeration body 19 is discharged into the water only from the upper end port 30 a of the exhaust pipe 30.

  Further, in an emergency when the reversing water surface (water level) L2 ′ is lower than the height of the lower end port 31b of the emergency exhaust pipe 31, the float valve 33 (A, B) is lowered according to the reversing water surface (water level) L2 ′. By opening the lower end port 31b of the exhaust pipe 31, the excess air accumulated in the air reservoir chamber 26 in the aeration body 19 is urgently discharged into the water from the upper end port 31a.

  Therefore, in the event of an emergency when the exhaust valve 30 is faulty, the excess air in the aeration body 19 is urgently discharged to the outside, so that the aeration body 19 can be prevented from suddenly rising, deformation, or breakage.

  And since the flexible hose like the former deep layer aeration apparatus A of the background art is unnecessary, there is a risk of blockage due to twisting or bending, troubles such as damage due to floating materials such as driftwood, dust sucked in from the lower layer, etc. There is no risk of clogging.

  Further, unlike the latter deep layer aeration apparatus B of the background art, the float valve 33 (A, B) in the aeration body 19 is not reversed by a pressure difference between the inside and outside, but the reverse water surface (water level) L2. Since the structure is opened and closed by raising and lowering L2 ′, adjustment of the opening and closing pressure is unnecessary, and the reliability of emergency exhaust through the emergency exhaust pipe 31 is excellent.

  The float valve 33 (A, B) is arranged in the aeration body 19 without any part directly facing the outside of the aeration body, that is, in the dam lake, like the latter deep layer aeration apparatus B of the background art. Therefore, there is no risk that the floating part such as dust or sand will be clogged in the operating part, or the floating part such as fallen leaves or plastic bags will not block the opening part of the valve. Excellent exhaust reliability.

  In this way, there is no influence of the differential pressure inside and outside the aeration main body 19 or floating substances, and the reliability of emergency exhaust through the emergency exhaust pipe 31 can always be guaranteed.

  In addition, the float valve 33 (A, B) has a simple configuration that moves up and down with buoyancy in accordance with the water level and opens and closes the lower end 31b of the emergency exhaust pipe 31, so it can be used for a long time in water. It is hard to break down.

  Further, since the upper end port 31a of the emergency exhaust pipe 31 is curved downward in an inverted U shape, there is no possibility that dust, sand, etc. floating in the water will enter the aeration body 19 and accumulate. Note that it is not particularly necessary to bend into an inverted U-shape where dust or sand cannot enter, and it may be straight.

  Furthermore, by making the exhaust pipe 30 also serve as the first air diffuser, if the surplus air d accumulated in the air reservoir chamber 26 is diffused into the water, the water in the surface layer is effectively agitated. Uniformity and generation of algae can be suppressed, and it will function as a combined deep aeration device.

DESCRIPTION OF SYMBOLS 15 Composite type deep aeration apparatus 16 Lake bottom etc. 19 Aeration main body 22 Inner cylinder 23 Baffle plate 24 Outer cylinder 26 Air storage chamber 30 Exhaust pipe (also serves as 2nd diffuser pipe)
31 Emergency exhaust pipe 31a Upper end port 31b Lower end port 33 (A, B) Float valve 34 Guide member d Excess air L2, L2 'Inverted water surface (water level)

Claims (4)

An exhaust pipe and an emergency exhaust pipe are installed at the top of the aeration body that is moored at the bottom of a lake such as a dam lake and circulates deep water near the bottom of the lake by aeration. A deep aeration apparatus that exhausts the excess air accumulated outside through an exhaust pipe and, in an emergency, exhausts the excess air accumulated in the air reservoir chamber inside the aeration body to the outside through an emergency exhaust pipe,
The emergency exhaust pipe has an upper end facing the outside of the aeration main body, a lower end opening below the lower end of the exhaust pipe, and lower than a normal water level of the air reservoir in the aeration main body. And
A float valve that moves up and down according to the fluctuation of the water level in the aeration body is exposed at the lower end of the emergency exhaust pipe,
In this float valve, when the water level is higher than the height of the lower end opening of the emergency exhaust pipe, the lower end opening of the emergency exhaust pipe is closed by buoyancy, and the water level is lower than the height of the lower end opening of the emergency exhaust pipe. A deep-layer aeration device characterized by opening the lower end of the emergency exhaust pipe in an emergency.   The deep aeration apparatus according to claim 1, wherein the float valve is guided in a vertical motion by a guide member attached to a baffle plate in the aeration main body or an emergency exhaust pipe itself.   The deep aeration apparatus according to claim 1, wherein an upper end port of the emergency exhaust pipe is curved in a downward inverted U shape.   The deep layer aeration apparatus according to any one of claims 1 to 3, wherein the exhaust pipe also serves as an air diffuser that diffuses excess air accumulated in the air reservoir chamber into the water.

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