JP3464984B2 - Aeration device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration device for improving the water quality of dam reservoirs, lakes, reservoirs, rivers and the like.

[0002]

2. Description of the Related Art Conventionally, in order to improve the quality of water in dam reservoirs, etc., air is blown from a diffusing pipe placed in the water to raise it, thereby causing a vertical circulation flow in the pond water to cause the surface layer of the reservoir to rise. Aerators that form a clear and high-temperature circulating mixed layer are known in the art.The aeration pipe is connected to a buoyant body above the water surface with a wire, and is also connected to a fixed member such as a weight and pulley installed on the lake bottom. Then, it is configured to stop at an arbitrary depth position. And (1) an aeration device that can raise the air diffuser to a buoyant body above the water to improve work efficiency during maintenance (Japanese Utility Model Publication No. 62-10100), and (2) occurs above the air diffuser. In order to prevent the accumulated water flow from staying under the buoyancy body, the lower part of the buoyancy body above the diffuser tube has a front inverted cone shape, and it functions as a guide for guiding the water flow from the central part of the buoyancy body to the outer peripheral direction. (Japanese Utility Model Laid-Open No. 62-114698) has been proposed.

[0003]

[Problems to be Solved by the Invention]
According to the aeration device of (1), a space that communicates with the water surface must be provided in the buoyancy body in order to raise the air diffusing pipe above the water surface. It is difficult to have a conical shape). on the other hand,
According to the aeration device of the above (2), since the lower part of the buoyancy body, which is above the diffuser tube, has to function as a guide for preventing the retention of the water flow, a space that allows the buoyancy body to lift the diffuser tube. Cannot be provided, and it is difficult to construct the diffusing pipe so that it can be pulled up above the water. Further, according to these aeration devices (1) and (2), since the fixing member is installed on the bottom of the lake to hold the diffuser pipe at an arbitrary water depth position, the fixing member maintenance work must be performed underwater. I have to.

The present invention has been made to solve the above-mentioned problems, and it is possible to prevent the water flow from staying below the buoyancy body and improve the workability of maintenance. The purpose is to provide.

[0005]

In order to achieve the above object, the present invention is provided with a diffusing pipe which is configured to be submerged in water, and an elevating means for elevating and lowering the diffusing pipe, and from a hole communicating with the water surface. In an aerator having a buoyant body capable of pulling up an air diffuser above the water, the buoyant body has a shape that widens from a lower portion toward an upper portion in a side view, and a portion above the air diffuser is a buoyant body main body. Separate
It is a water flow guide that can be pulled up above the water from the hole together with the air diffuser by the elevating means. For example, the shape of the buoyant body is an inverted conical shape in a side view including the water flow guide.

According to this structure, the buoyant body is shaped so as to spread from the lower part to the upper part in a side view, whereby the water flow under the buoyant body can be guided in the outer peripheral direction of the buoyant body. Moreover, since the water flow guide located above the air diffuser can be pulled up above the water from the hole together with the air diffuser, maintenance of the air diffuser can be performed on the water.
Furthermore, since the air diffuser itself is submerged in water, it is possible to stop the air diffuser at an arbitrary water depth position without installing a fixing member on the water bottom.

Further, the water flow guide has an opening at the lower end and a locking portion at the side, and the locking portion engages with the protrusion provided at the lower end of the hole. When stopped, the buoyancy body is moored, and when the air diffusing tube is raised by the elevating means, the lower part of the water flow guide fits into the air diffusing tube, and the water flow guide moves as the diffusing tube rises. It may be configured to rise.

According to this structure, when the air diffuser is moved up and down by the elevating means, the water flow guide can be moved up and down accordingly. Particularly, when the water flow guide is raised, the load on the lifting means is reduced because water in the water flow guide escapes from the opening at the lower end of the water flow guide. Also, when the water flow guide descends, pond water enters the water flow guide through the opening at the lower end of the water flow guide, so even if the water flow guide is made of a light material, it can be submerged easily and the water flow guide can be locked. Part and the projection of the lower end of the hole are locked,
The water flow guide can be moored to the lower end of the buoyancy body, and the air diffuser can be separated from the water flow guide and lowered to a deeper water depth position.

Further, the water temperature detecting means which is provided in the air diffuser and sequentially detects the water temperature each time the air diffuser descends by a constant water depth, and the water temperature at the present water depth detected by the water temperature detecting means are previously detected. When the water temperature detected by the water temperature detecting means changes significantly compared with the water temperature at the water depth, the operation control of the elevating means is performed so that the diffusing pipe descends to a water depth at which the water temperature is substantially equal to the water temperature detected last time. It may be configured to include control means for performing.

According to this structure, the thermocline where the water temperature suddenly changes is automatically sensed, and the diffusing tube is lowered to the bottom of the thermocline to ensure the thermoclic layer affecting the ecosystem by the diffusing tube. Can be stirred.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An aeration apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of an aeration device according to the present invention, and FIG. 2 is a top view of the aeration device. The aeration device 1 is installed in a dam reservoir or the like, and has a buoyant body 2 floated on the water surface and the buoyant body 2
The air diffuser 4 is suspended by the wire 3 and the compressor 6 that supplies air to the air diffuser 4 from the air supply pipe 5. Further, in order to stop the buoyancy body 2 at a predetermined position on the water surface, the buoyancy body 2 is supported by a wire 7 on the pond bottom or the like, and a display buoy 8 is attached to the wire 7.

The buoyancy body 2 has an inverted conical shape in a side view, guides the rising water flow generated by the air discharge from the air diffuser 4 toward the outer circumference of the buoyancy body 2, and does not allow the water flow to stay below the buoyancy body 2. It is like this. Further, the buoyancy body 2 is configured such that the upper surface portion 21 is exposed above the water.
A winch 10 for winding up the wire 3 connected to the air diffusing tube 4 and pulling up the air diffusing tube 4 above the water is provided in the. A hole 22 that communicates with the water surface is provided in the substantially central portion of the buoyancy body 2, and the buoyancy body 2 has a substantially donut shape in plan view.

The lower part of the buoyant body 2 and the upper part of the air diffuser 4 is used as a water flow guide 24 which can be raised and lowered. The water flow guide 24 forms a part of the buoyant body 2 having an inverted conical shape, and the diffuser pipe 4 is provided at a substantially central portion of the water flow guide 24.
The wire 3 connected to is passed through (however, the wire 3 and the water flow guide 24 are not locked). When the wire 3 is wound up and the air diffuser 4 is pulled up, the water flow guide 24 is pushed upward by the air diffuser 4, separated from the buoyancy body 25, and is pulled up above the water together with the air diffuser 4 through the hole 22. Therefore, it is possible to raise the air diffuser 4 above the water and perform maintenance work on the upper surface portion 21. The upper surface portion 21 is provided with a fence 23 for work safety on the upper surface portion 21.

The water flow guide 24 is shaped like a mortar and has a hollow interior without an upper surface, and has a vertically movable cap portion 24b at its lower end. Air diffuser 4
And when pulling up the water flow guide 24, the cap portion 24b
When a part of the air diffuser 4 is pushed up and is pushed up, an opening is made at the lower end of the water flow guide 24, and the water in the water flow guide 24 is discharged from here. This reduces the load on the winch 10 when pulling up the air diffuser 4 and the water flow guide 24. When the water flow guide 24 is lowered into the water, water easily enters the water flow guide 24 through the opening and sinks therein. In addition, the water flow guide 24 is anchored to the lower portion of the buoyant body 25 by the locking portion 24a provided at the side end being locked to the protrusion 22a provided in the hole 22, and as shown in FIG. As shown, it becomes a part of the buoyancy body 2 and has a function of guiding the rising water flow generated by the air diffuser 4 to the outer peripheral side of the buoyancy body 2.

The diffuser pipe 4 is a ring-shaped pipe provided with a large number of air outlets in plan view, and is supported by a support base 41. The engaging portion 4 having a shape corresponding to the lower shape of the water flow guide 24 is provided at the substantially central portion of the support base 41.
3, and a protrusion 44 that pushes up the cap portion 24b of the water flow guide 24 is provided. In addition, a weight 45 is attached to the support base 41 for submerging the air diffuser 4 in water. Therefore, the diffusing pipe 4 can be stopped at an arbitrary water depth position by the sinking force of the weight 45 and the suspension by the wire 5, and in order to stop the diffusing pipe 4 at an arbitrary water depth position on the pond bottom. Has a structure that does not require a fixing member.

The lifting of the air diffuser 4 and the water flow guide 24 above the water by the winch 10 will be described. Figure 3
FIG. 4 is a diagram showing a state in which the air diffusing pipe 4 has risen to just below the water flow guide 24, and FIG. 4 is a diagram showing a state in which the air diffusing pipe 4 is united with the water flow guide 24 and pulled up above the water. Winch 10
The air diffusing pipe 4 is pulled up by winding the wire 3 by this, but since the wire 3 is not locked to the water flow guide 24, when the wire 3 is wound up, only the diffusing pipe 4 is on the water surface as shown in FIG. Rise towards. Then, when the air diffuser 4 further rises, the lower end of the water flow guide 24 is fitted into the engaging portion 43 of the support base 41, whereby the air diffuser 4
And the water flow guide 24 is integrated. At this time, the support base 41
The protrusion 44 pushes the cap portion 24b of the water flow guide 24 upward. When the wire 3 is further wound up, the wire 3 is pushed up by the air diffuser 4 and the water flow guide 24 also rises together with the air diffuser 4. At this time, since the cap portion 24b is pushed up by the protrusion 44, an opening is formed at the lower end portion of the water flow guide 24, so that the water accumulated in the water flow guide 24 is discharged from here. The winch 10 is stopped when the air diffuser 4 and the water flow guide 24 are lifted above the water (see FIG. 4).

When the wire 3 is unwound by the winch 10 and the diffusing pipe 4 and the water flow guide 24 are lowered into the water, the water flow guide 24 is opened from the opening at the lower end of the water flow guide 24.
The water flow guide 24 easily sinks due to the entry of water. When the water flow guide 24 is lowered to the lower end of the buoyancy body 25, the locking portion 24a is locked to the protrusion 22a of the hole 22 and the water flow guide 24 is moored to the buoyancy body 25. Will stop. on the other hand,
The air diffuser 4 separates from the water flow guide 24 and further descends.
The winch 10 is stopped when the air diffuser 4 descends to the desired water depth.

Next, the raising / lowering control of the air diffuser 4 according to the water temperature will be described. FIG. 5 is a flowchart at the time of raising / lowering control of the air diffuser 4 according to the water temperature. A water temperature sensor (not shown) is attached to the air diffuser 4 to detect the water temperature,
Based on the water temperature detected by the water temperature sensor, a control device (not shown) detects the water thermocline, and the diffusing pipe 4 is automatically lowered below the water thermocline to efficiently stir the pond water. There is.

When the winch 10 is driven and the diffusing pipe 4 is started to descend (S1), the water temperature is detected by the temperature detecting sensor at a predetermined water depth (constant time) as the diffusing pipe 4 descends (S2). , The detected water temperature is sequentially stored (S
3). Then, the second and subsequent water temperature detections are compared with the previously detected temperature each time the water temperature is detected as the diffusing pipe 4 descends (S4, S5). When the difference between the previously detected water temperature and the newly detected water temperature is equal to or greater than the predetermined value (YES in S5), the process proceeds to S6 and subsequent steps, and the previously detected water temperature and the newly detected water temperature are If the difference is less than the predetermined value (NO in S5), the processes of S1 to S5 are repeated until the difference between the previously detected water temperature and the newly detected water temperature becomes the predetermined value or more. Here, the predetermined value refers to a temperature difference to the extent that it can be considered that both water temperatures have not changed in the comparison of the water temperatures of the respective water depths, and is appropriately changed depending on the water temperature condition of the pond where the aeration apparatus 1 is installed. It

When the difference between the previously detected water temperature in S5 and the newly detected water temperature is greater than or equal to a predetermined value, the diffusing pipe 4 is further lowered and the water temperature is detected every predetermined water depth. The comparison with the detected temperature is continued (S6 to S9), and when the difference between the previously detected water temperature and the newly detected water temperature becomes equal to or less than the predetermined value (YES in S9), the drive of the winch 10 is stopped. , The descent of the air diffuser 4 is stopped (S1
0).

In this way, the water temperature is detected every time the air diffuser 4 descends by a predetermined water depth, and if the descent of the air diffuser 4 is stopped when the detected water temperature stabilizes, the water temperature changes rapidly. Air is discharged from the diffusing tube 4 under the existing thermocline to stir the thermocline, and the cold and heavy water near the lower part of the pond is mixed with the light and warm water on the surface of the pond to remove the dissolved acid. A large amount of water is supplied to the surface layer of the pond, and the dissolved oxygen amount in the shallow layer is increased to effectively prevent the generation of water-blooms.

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. For example, in the above-mentioned embodiment, the weight 45 is attached in order to sink the air diffuser 4 into the water, but the air diffuser 4 and the support base 41 may be made of a material having a large specific gravity to be submerged in water. Good. Further, in the above embodiment, the shape of the buoyancy body 2 is an inverted conical shape in a side view, but the shape is not limited to this, and the shape is such that the buoyancy body 2 spreads from the lower part to the upper part in the side view. Other shapes may be used as long as they can guide the water flow to the outer circumference of the buoyancy body 2. For example, it may be a hemisphere, a pyramid, or the like. Further, in the above embodiment, the buoyancy body 2 and the air diffuser pipe 4 are stopped at a desired position in the dam reservoir by connecting the buoyancy body 2 to the pond bottom or the like with the wire 7. The buoyancy body 2 and the air diffusing tube 4 may be stopped at a desired position by lowering the anchor on the bottom of the pond.

[0023]

As described above, according to the present invention, the water flow under the buoyancy body can be guided in the outer circumferential direction of the buoyancy body to prevent the water flow from staying under the buoyancy body, and the air diffuser can be provided. Since it can be pulled up above the water together with the water flow guide, the workability of maintenance of the air diffuser is improved. Furthermore, since the air diffuser can be stopped at an arbitrary water depth position without the need to install a fixing member at the bottom of the pond, maintenance work underwater is not required.

In addition, an opening is provided at the lower end of the water flow guide, and a locking portion is provided at the side, and the locking portion is locked to a protrusion provided at the lower end of the hole, so that the buoyancy body is formed. When moored to the main body and when the diffusing pipe is lifted by the elevating means, if the lower part of the water flow guide fits into the diffusing pipe and is pulled up onto the water together with the diffusing pipe, the water flow guide is moved up and down with a simple structure. As a result, the manufacturing cost can be reduced, and the load on the elevating means during elevating the water flow guide can be reduced.

If the water temperature detecting means is provided in the air diffuser and the water temperature detected by the water temperature detecting means fluctuates greatly when the air diffuser moves up and down, the air diffuser descends to a stable water depth. It is possible to automatically detect the thermocline where the water temperature changes suddenly and lower the diffusing tube to the bottom of the thermocline, and reliably stir the thermoclic layer affecting the ecosystem.

[Brief description of drawings]

FIG. 1 is a side sectional view of an aeration device according to the present invention.

FIG. 2 is a top view of the aeration device.

FIG. 3 is a view showing a state in which an air diffusing tube is lifted up to just below a water flow guide.

FIG. 4 is a view showing a state in which an air diffusing tube is combined with a water flow guide and pulled up above water.

FIG. 5 is a flowchart at the time of raising / lowering control of the air diffuser according to the water temperature.

[Explanation of symbols]

1 Aeration device 2 buoyancy body 4 Air diffuser 10 winches 22 holes 22a protrusion 24 Water Flow Guide 24a locking part 25 Buoyant body 45 weights

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Claims (4)

(57) [Claims] 1. An air diffuser configured to be submerged in water, and a buoyant body provided with an elevating means for elevating and lowering the air diffuser and capable of pulling the air diffuser above water through a hole communicating with the water surface. In the aerator, the buoyant body is shaped so as to expand from a lower portion to an upper portion in a side view, and a portion above the diffusing tube is separated from the buoyant body main body, and is lifted together with the diffusing tube to form the hole portion. An aerator characterized by being used as a water flow guide that can be pulled up from above to the water. 2. The buoyant body includes the water flow guide and has an inverted conical shape in a side view.
The aeration device according to. 3. The water flow guide has an opening at the lower end and an engaging portion at the side, and the engaging portion engages with a protrusion provided at the lower end of the hole. When stopped, the buoyancy body is moored, and when the air diffusing tube is raised by the elevating means, the lower part of the water flow guide fits into the air diffusing tube, and the water flow guide moves as the diffusing tube rises. The aeration device according to claim 1 or 2, wherein the aeration device is configured to rise. 4. A water temperature detecting means which is provided in the air diffuser and sequentially detects the water temperature each time the air diffuser descends by a constant water depth, and the water temperature of the current water depth detected by the water temperature detecting means is previously detected. When the water temperature detected by the water temperature detecting means changes significantly compared with the water temperature at the water depth, the operation control of the elevating means is performed so that the diffusing pipe descends to a water depth at which the water temperature is substantially equal to the water temperature detected last time. The aeration apparatus according to any one of claims 1 to 3, further comprising a control means for performing the above.