JP3314892B2 - Aeration type water flow generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffused water flow that suppresses abnormal growth of phytoplankton caused by eutrophication by artificially manipulating the state of temperature stratification in a water area such as a dam lake. It relates to a generator.

[0002]

2. Description of the Related Art Generally, in a water area such as a dam lake, the water temperature becomes relatively high in a relatively shallow portion due to the effects of solar heat and the outside air temperature.
When the temperature falls below, the temperature change does not affect the temperature, and the temperature is kept at a relatively low temperature and is kept in a constant state without seasonal change.

In many phytoplankton, photosynthetic activity is actively performed in the so-called luminous layer where the surface rays are high (temperature stratification) and the sunlight reaches, and the phytoplankton takes in nutrients in water and proliferates. Techniques for suppressing the abnormal growth of phytoplankton caused by eutrophication by manipulating the temperature stratification state artificially are known as fountains and intermittent air pumping.

[0004] The fountain device has a function as a stratification circulation device, in which heat exchange is performed by pumping low-temperature low-temperature water and spraying it into the air, and has a function of promoting the adjustment of the water temperature of the stratification and the lowering of the thermocline. is there. In addition, by making the water absorption point of the pump shallow, the plankton in the water is sucked in, and the pressurization by the pump has the effect of damaging the plankton and suppressing the proliferation ability.

[0005] However, the fountain device requires a large amount of power to damage the plankton due to pressurization and to spray water into the air, so that the pump power is relatively large. Therefore, the energy used for circulation in the stratification is relatively large.

[0006] Since the intermittent pumping cylinder is connected to an anchor provided on the bottom of the water, it has poor mobility in the vertical direction with respect to a change in the water surface, and is not suitable for dam lakes or the like having large water level fluctuations. In addition, there is a possibility that the thermocline is destroyed due to generation of large convection.

[0007] In addition, since convection is generated intermittently by bubble bombs, there is a problem that the time interval between the generation of convection becomes longer because a small amount of air is supplied, so that the interval at which bubble bombs are emitted becomes longer.

The pump-type water flow generator has many advantages because it is easy to supply the deep water to the surface layer for lowering the steep layer and to control the amount of water for convection, but it has many advantages. Not. As the jet flow velocity injected from the pump nozzle becomes farther from the nozzle, the axial flow velocity becomes slower, so that the entraining force becomes weaker.

On the other hand, the generation of the water flow by the bubbles utilizes the force of the bubbles expanding and rising when the bubbles rise, and therefore has the characteristic that the entrainment force becomes stronger as the bubbles rise.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a diffused submerged water flow generation apparatus which can efficiently generate a circulating flow in a stratification and can suppress the phytoplankton growth activity which can cope with a dam lake having a large water level fluctuation. It is intended to provide.

[0011]

According to the present invention, there is provided an aeration-type underwater water flow generating apparatus having a floating body for supporting the whole apparatus on the water surface, comprising a bubble generating apparatus suspended by a cable adjustable from the floating body. , And a water temperature sensor for controlling the generation state of bubbles.

Further, according to the present invention, in an aeration-type underwater water flow generator having a floating body that supports the entire apparatus on the water surface, a second bubble that generates a convection suspended by a cable adjustable from the floating body is provided. A generating device, a first bubble generating device for generating an upward flow due to a steep layer lowering, a switching means for adjusting or switching an operation state of the first and second bubble generating devices based on a signal from the temperature sensor, and a temperature sensor. It is configured.

[0013]

[Explanation of the function and effect] In the diffuser-type underwater water flow generator configured as described above, the diffuser tube is initially installed at a deep position to efficiently generate a water flow with a strong entrainment force, and a predetermined jump is performed by a temperature sensor. When it is detected that the lowering of the stratum has been achieved, the air diffuser is moved upward, and is operated near a predetermined steep stratum to continuously generate convection in the surface layer.

Further, a first air diffuser and a second air diffuser are provided, and the second air diffuser is installed in the vicinity of a predetermined cliff. And the water level determined from the above. Then, when a predetermined drop in the stratum is detected by the temperature sensor, convection in the surface layer may be generated by switching from the first air diffuser to the second air diffuser.

[0015] By such an operation, it is possible to prevent an unnecessarily lowering of the stratum layer, and it is possible to continuously and efficiently generate convection in the surface layer.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an air diffuser 4 is suspended from one end of a suspension wire 5 from a floating body 1 having a plurality of supporting floats 1a, and the other end of the wire 5 is connected to a winch 7 on the floating body 1.

A plurality (three in the illustrated example) of temperature sensors 2 are provided between the air diffuser 4 and the floating body 1 at predetermined water depths.

The air pipe 3 is connected to the air diffuser 4 from the air compressor 6 installed on land via water.

The operation will be described below.

Initially, the air diffuser 4 is suspended by the winch 7 to a water depth C which is deeper than the target water depth A for the steepest descent. Then, the air compressor 6 is operated to supply air to the air diffuser 4. Since the water depth is sufficiently deep, the bubbles exert a sufficient entraining ability to generate a strong updraft.

When the temperature sensor 2 at a predetermined water depth reaches a predetermined value,
Winch 7 when it is determined that the target water depth A has been reached
If the air diffuser 4 is raised and fixed just above the water depth A and switched to the operation for circulation in the surface layer, convection in the surface layer above the target steep layer is continued and the growth of phytoplankton is prevented. Is done.

FIG. 2 shows a second embodiment of the present invention, in which a floating body 11 supported by a plurality of supporting floats 11a is suspended by a winch 17 to a predetermined depth and suspended by a hanging wire 5 to a first diffuser tube. 14 and the second diffuser 1 suspended at the target water depth
5 are installed.

A plurality (four in the illustrated example) of temperature sensors 12 are provided between the air diffuser and the floating body 11, and the air diffuser 14 is switched by an air pipe 13a and the diffuser 15 is switched by an air pipe 13b. It is connected to the air compressor 6 via a valve 8.

Hereinafter, the operation will be described.

Initially, air is supplied from the air compressor 6 to the first air diffuser 14 via the switching valve 8 to generate air bubbles from a deep water position as in the first embodiment. When the temperature sensor 12 detects that the peak has reached a predetermined depth, the second air diffuser 15
The switching valve 8 is switched so as to supply air.

Since the second air diffuser 15 is installed at the target water depth of the steep layer, if the operation is continued as it is, convection is generated on the surface without increasing the steep layer.

[0028]

Since the present invention is configured as described above, in order to lower the steep layer to the target water depth, the bubble generator is installed at a deep water depth to effectively utilize the entrainment function, When the crest reaches the target water depth, the bubble generator can be operated at that depth to continuously generate stratified convection, thereby preventing the growth of phytoplankton without breaking the crest.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a diffused air bubble generation device showing one embodiment of the present invention.

FIG. 2 is a configuration diagram of a bubble generation device showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 ... Floating body 2, 12 ... Temperature sensor 3, 13 ... Air tube 4 ... Air diffuser 5 ... Hanging wire 6 ... Air compressor 7 ... Winch 8 ... Switching valve 14 ... First air diffuser 15 ... Second Diffuser

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-245889 (JP, A) JP-A-2-258095 (JP, A) JP-A-58-153574 (JP, A) 34915 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 7/00 C02F 3/20

Claims (2)

(57) [Claims] An aeration-type underwater water flow generator having a floating body that supports the whole apparatus on the water surface, wherein the air bubble generator is suspended by a cable adjustable from the floating body, and a bubble generating apparatus for controlling a bubble generation state. A diffused underwater water flow generator, comprising: a water temperature sensor. 2. A diffuser-type underwater water flow generator having a floating body that supports the whole apparatus on the water surface, wherein a second bubble generator that generates convection suspended by a cable adjustable from the floating body and a steep drop. Therefore, a first bubble generator that generates an upward flow, switching means for adjusting or switching the operation state of the first and second bubble generators based on a signal from the temperature sensor, and a temperature sensor are provided. A diffused underwater water flow generator.