JPH074596B2 - Underwater aeration stirrer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged aeration and agitation device applied to aeration treatment of a reservoir such as a sand basin and a sewage treatment tank.

[0002]

2. Description of the Related Art A water flow generator is usually used as an underwater aerating and stirring device for purifying stored water in a reservoir.
In this water flow generator, for example, a plurality of blades are provided at the tip of a rotary shaft that is directly connected to the motor output shaft, and this rotary shaft has a water intake hole in the middle, and at the base end, A communication hole is provided to suck in air. Further, an air chamber having a cylindrical cross section is formed between the rotary shaft and a generator body surrounding the rotary shaft, and an air supply pipe is opened in the air chamber.

When a jet swirling flow of the stored water occurs around the rotating shaft by the blades rotated by the start of the motor, a part of the stored water is sucked from the water intake hole by the negative pressure generated in the hollow portion of the rotating shaft. At the same time, the air above the water, which is guided to the air chamber through the air supply pipe, is sucked from the communication hole to form an air flow, and this air flow merges with the jet swirl flow to perform effective gas-liquid mixing. ing.

However, the air is supplied from the air supply pipe in the surface layer of the reservoir by the negative pressure generated in the hollow part of the rotary shaft, but in the deep part of the reservoir, the air pressurized by the blower is supplied. ing. This blower has an air suction pipe and a blower body installed on the ground to connect the air discharge pipe to the air supply pipe, and an underwater blower installed near the water flow generator to remove the air suction pipe of this underwater blower. While extending above the water, there is one that connects the air discharge pipe to the air chamber of the generator body. The air discharge pipe is designed to flow out near the blade of the water flow generator.

[0005]

However, when the blower is installed above the ground, not only is it unattractive to the appearance and noise is severe, but it is necessary to secure a site for installation, so the location conditions are good. Where it is not there, layout is difficult and maintenance is not easy. Also, when installing a submersible blower, the submersible blower is located at a deep water position.Therefore, if the water flow generator stops due to a stop operation or a power outage, the stored water will flow from the hollow shaft into the air chamber of the generator body. There is a risk of backflow to the underwater blower via the, and damage to the underwater blower.

Therefore, in order to prevent the stored water from flowing backward to the underwater blower, the air discharge pipe of the underwater blower is raised above the water from the deep layer, and then the air of the generator main body located in the deep layer is re-established. Since it has to be formed in an inverted U shape for connecting to the room, there is a problem that the structure is complicated and maintenance is not easy.

In view of such conventional circumstances, the present invention has a structure in which the air discharge pipe of the underwater blower does not rise above the water.
Moreover, it is an object of the present invention to provide an underwater aeration and agitation device that does not receive the reverse flow action of stored water when stopped.

[0008]

In the underwater aeration and agitation device of the present invention, a guide column is erected in the depth direction of a reservoir, and a support base for supporting a water flow generator and an underwater blower can be moved up and down on the guide column. In the water aeration stirrer provided in the water flow generator, a blade is provided on a rotating shaft connected to a motor output shaft, and a water flow is generated by the rotation of the blade. Moreover, the rotating shaft and the water flow generator are provided. An air chamber whose front and rear are axially sealed is provided between the main body and the air discharge pipe of the submersible blower is always connected to the air chamber along the water flow generator so as to be located in the water. At the same time, the air in the air chamber is discharged near the blades of the water flow generator and is discharged together with the water flow from the water flow generator.The air discharge pipe has an air chamber, a check valve, and a shutoff valve. And backflow prevention consisting of a safety valve, etc. Device is provided. Further, the submerged aeration stirring apparatus of the present invention is a support in which a water flow generator that rotates a blade provided with a rotation shaft to generate a water flow and an underwater blower equipped with an underwater motor can be moved up and down along a guide column. An air supply pipe, which is provided on a stand and is open to the atmosphere, is connected to the suction side of the underwater blower, and the discharge air of the underwater blower flows out to the vicinity of the blade of the water flow generator via a backflow prevention device. It is done like this. Preferably, in the guide pillar, a first guide member having a notch groove reaching the upper end from the vicinity of the lower portion of the hollow member is provided in the vertical direction near the side wall of the sand basin, etc. The second guide member is extended laterally, and the first guide member and the second guide member are connected by a connecting member such as a hollow bent pipe that is divided in half, and at least the upper portion of the air supply pipe can be bent. The first guide member moves up and down through the notch and the upper part moves in the second guide member.

[0009]

In the above structure, when the water flow generator and the underwater blower are stopped due to a stop operation or a power failure,
The stored water that is about to flow back from the air chamber of the water flow generator into the air chamber becomes a pressure equalized state with the water pressure of the stored water by compressing the air remaining in the air chamber etc. by closing the shutoff valve and the check valve. By the way, stop. Further, if the pressure inside the air discharge pipe between the shutoff valve and the submersible blower is abnormally increased, the safety valve is opened and the air is discharged to the air intake pipe of the submersible blower.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In addition, as for the directions in this description, the left side is called the front and the right side is called the rear in FIGS. 1, 5, and 6.

The underwater aeration and agitation apparatus 1 of Embodiment 1 shown in FIGS. 1 to 4 is a water flow generator 2A and an underwater blower 2B.
And a backflow prevention device 23 interposed between the two. The water flow generator 2A and the underwater blower 2B are used in a reservoir P such as a sand basin and a wastewater treatment tank.
The aeration process of the stored water W stored in is carried out at an arbitrary depth from a shallow surface layer portion to a deep water layer portion, and is provided so as to stand up in the depth direction of the reservoir P, The guide pillars 3 are mounted on the side walls P of the reservoir P via the brackets 4.
It is fixed at w. The water flow generator 2A is attached to the guide pillar 3.
Also, a support base 5 for supporting the submersible blower 2B is provided so as to be able to move up and down, and the support base 5 can be adjusted in vertical height by a chain (not shown) coupled to the upper side of the water flow generator 2A.

A stopper 6 is provided so as to project forward from the lower end portion of the guide column 3 so as to regulate the lowered position of the support base 5. The support base 5 includes a mounting plate 7 on which the water flow generator 2A and the underwater blower 2B are mounted and fixed, and a sliding cylinder 8 having a C-shaped cross section which is connected to the rear side of the mounting plate 7 and is raised.
And a reinforcing member 9 joined to the lower side of the mounting plate 7,
A sliding cylinder 8 is fitted on the outer circumference of the guide column 3.

In the water flow generator 2A, between the rotary shaft 11 connected to the motor output shaft 10 and the water flow generator body 12, there is an air chamber 15 whose front and rear are sealed by a sliding ring 13 and a mechanical seal 14. It is provided. 16 is a communication hole,
A plurality of rotary shafts 11 are provided so that the air chamber 15 and the hollow portion 11a of the rotary shaft 11 communicate with each other. Reference numeral 17 is a cross blade body, which is detachably screwed into the tip of the rotary shaft 11, and an end plate 17c is attached to the center of the tip of the cross blade 17b inside the outer cylinder 17a. The air flows out from the outer peripheral portion of the. The hole 17d is an engagement hole of a screwdriver device. 18 is a draft ring,
It is fixed to the support base 5 so as to surround the plurality of blades 19 provided at the front end of the rotary shaft 11.

The submersible blower 2B has a discharge pressure set to, for example, 0.4 kg / cm ² , and an air supply pipe 21.
And an air discharge pipe 22 are provided. Air supply pipe 21
Is projected above the water, and an appropriate strainer or the like is attached to its intake port.

A backflow prevention device 23 is provided at an intermediate portion of the air discharge pipe 22 of the submersible blower 2B connected to the air chamber 15.
Is provided. This backflow prevention device 23 is provided in the air chamber 1
5 toward the submersible blower 2B, the air chamber 24,
The check valve 25, the shutoff valve 26, the safety valve 27, and the like are sequentially arranged and configured.

In the air chamber 24, when the water flow generator 2A is stopped due to a stop operation or a power failure, the stored water W flows backward from the hollow portion 11a of the rotary shaft 11 through the communication hole 16, the air chamber 15 and the air discharge pipe 22. This is to alleviate the impact effect that occurs, and its size is selected to be as large as possible within the installable range.

The check valve 25 is for closing the air inside the air discharge pipe 22 connected to the air chamber 24 when the submersible blower 2B is stopped, for example, when the pressure drops by 0.1 kg / cm ² and is known. Is applied.

The shutoff valve 26 is provided when the water flow generator 2A and the underwater blower 2B are stopped by a stop operation or a power failure.
A well-known solenoid valve or the like is applied for closing the power source in cooperation with the power shutoff.

The safety valve 27 is provided when the pressure of the air inside the air discharge pipe 22 rises to 0.5 kg / cm ² , for example.
This air is released to the air supply pipe 21, and the underwater blower 2
A known check valve is applied to prevent the impact of the backflow air from acting on B. 28a, 28b, 28
c is a power supply cable.

Reference numeral 29 is a clamp, which is a suction hose 21a connected to the air supply pipe 21 and power supply cables 28a, 28.
The upper ends of b and 28c are guided by the clamp 29 to the guide column 3
Supported by.

Next, the operation of the first embodiment will be described. When the blades 19 rotate due to the activation of the water flow generator 2A, the stored water W around the water flow generator 2A is sucked into the draft ring 18 by the blades 19 and agitated by the blades 19 to form a powerful jet swirl flow, which is pushed forward. .

The air sucked into the air supply pipe 21 from above the water by the underwater blower 2B started at the same time as the water flow generator 2A is pressurized to 0.4 kg / cm ² and then passes through the air chamber 24 and the air chamber 15 Sent to. This air chamber 1
The air inside 5 passes through the communication hole 16 and passes through the rotary shaft 11
The air is pushed out to the middle part 11a of the cross blade body 1
The gas is jetted from the outer peripheral portion of the end plate 17c of No. 7 and mixed into the jet swirling flow as an air flow, whereby effective gas-liquid mixing is performed and aeration treatment of the stored water is performed.

If the water flow generator 2A and the submersible blower 2B are stopped due to a stop operation or a power failure, the stored water W flows from the hollow portion 11a of the rotating shaft 11 through the air chamber 15 with a water pressure corresponding to the storage depth. Backflow into the air chamber 24.

At this time, the shut-off valve 26 closes at the same time as the power failure, and when the pressure inside the air discharge pipe 22 in front of the shut-off valve 26 drops to 0.1 kg / cm ² , the check valve 25 closes. Therefore, the stored water W that is about to flow back into the air chamber 15 compresses the air that remains in the air chamber 24 and the air discharge pipe 22 up to the check valve 25, and this air pressure equalizes with the water pressure of the stored water W. The backflow action stops when the state is reached.

On the other hand, the inside of the air discharge pipe 22 between the shutoff valve 26 and the submersible blower 2B is 0.5 kg / cm due to an unexpected cause.
^{When the} pressure rises to ² , the safety valve 27 is opened and discharged to the air supply pipe 21.

The submerged aeration and agitation apparatus 50 of Embodiment 2 shown in FIGS. 5 to 8 comprises a water flow generator 51 and an underwater blower 5.
8 and a non-return valve 63 interposed between the two as main parts.

The water flow generator 51 is a device in which a water flow is generated by the rotation of blades of an axial flow pump or the like which is turned sideways, and the blade 52 is attached to the motor output shaft 51c in the tip recess 51b of the water flow generator main body 51a. The rotary shaft 53 is fixed by a friction link 54 and a bolt 55, and is fixed to a support base 56. The submersible motor 5 is provided above the support base 56.
An underwater blower 58 with 7 is fixed.

The first air supply pipe 59 provided upright on the mounting plate 60 of the support base 56 is watertightly closed at the lower portion by the mounting plate 60, and the upper portion is opened to the atmosphere. 5
Reference numeral 9a is a connecting fitting, which is provided at a side portion of the first air supply pipe 59, and a seal such as an O-ring is fitted in the inner recess.

The suction port 58a of the submersible blower 58 and the connecting fitting 59a of the first air supply pipe 59 are connected by a second air supply pipe 61.

The discharge port 58b of the submersible blower 58 and the check valve 63 attached to the upper part of the first air supply pipe 59 and the first air discharge pipe 62 are communicated with each other, and the water flow generator 51 and the rotary shaft 53 are connected from the check valve 63. The second air discharge pipe 64 is communicated with the air chamber 65 between and. Reference numeral 66 is a fixed clamp provided on the support base 56.

The support base 56 has vertically movable members 67 and 68 vertically slidably fitted to a guide column 69 fixed to a side wall of a reservoir P of a rainwater pumping station, and a chain hoist 70 fixed to an upper portion of an underwater blower 58. It is designed to move up and down.

Reference numeral 71 is a mechanical seal of the motor shaft 51c, and 72 is a sliding ring. The space between the peripheral wall of the tip recess 51b of the pump body 51a and the rotary shaft 53 of the blade 52 serves as the air chamber 65. ing.

The rotary shaft 53 is hollow with its tip open, and the blade member 73 is screwed into the tip. In the blade member 73, a plurality of blades 73a and blades 73b are alternately and integrally provided in a passage communicating from the central portion to the outer periphery. A cylindrical rectifying ring 53b is fixed to the rotary shaft 53 slightly outside the outer circumference of the blade member 73. Rectifying ring 53
Inside the b, a plurality of protrusions 53c are provided,
The air between the rectifying ring 53b and the blade member 73 is easily ejected forward. On the rear side of the rotary shaft 53,
The hollow portion 53 of the rotary shaft 53 is provided with several communication holes 74.
a and the air chamber 65 are in communication with each other.

A draft ring 75 is fixed to the support 56 so as to surround the blades 52 so as to surround the blades 52. The efficiency of the blades 52 at the blade tips is increased, and a strong jet swirling flow JF is provided.
It is designed to serve as a guide for generating.

Reference numeral 76 is a power supply cable for a water flow generator, 77 is a power supply cable for an underwater blower, P is a treatment tank at a rainwater pump station, and 78 is settling sludge.

Next, the operation of the second embodiment will be described. In a reservoir P such as a rainwater pumping station, when the stored water is sucked up and reaches a certain water level, a suction pump located downstream is stopped, and the stored water accumulates and decays if left unattended. Then, when power is supplied to the water flow generator 51 and the underwater blower 58 by the power supply cable 76 of the water flow generator 51 and the power supply cable 77 of the underwater blower 58, the water flow is generated by the rotation of the blades 52 of the water flow generator 51. Further, the submersible blower 58 allows the first air supply pipe 59 and the second air supply pipe 6 to be supplied.
Atmosphere is sucked through 2 and this air is discharged through the first air discharge pipe 62, the check valve 63 is opened, and the air is sent into the air chamber 65 through the second air discharge pipe 64. The air in the air chamber 65 passes through the communication hole 74 and passes through the hollow portion 53 of the rotating shaft 53.
At point a, jetting is performed forward by the blade member and pressure, swirling and stirring are performed in the water flow of the water flow generator 51, and air is mixed into the water as fine particles to prevent the stored water from spoiling.

In the submersible aeration and agitation apparatus 50 of this embodiment, since the submersible blower 58 is located in the water above the water flow generator 51, it does not require a land installation area. The noise of the submersible blower 58 is low because it is used.

At the time of rainfall, when the water level of rainwater rises, the rainwater pump located downstream is activated and new rainwater flows in, resulting in a large velocity flow in the rainwater treatment tank. When there is a risk that the dust thrown into the rainwater collides with the water flow generator 51 and the underwater blower 58 and damages them, the chain hoist 70 is driven to lift the support base 56 above the water surface. Therefore, the water flow generator 51 and the underwater blower 58
Does not cause damage due to the collision of dust that has flowed in.

The underwater aeration and agitation apparatus 100 of Embodiment 3 shown in FIGS. 9 to 15 has a water flow generator 107, an underwater blower 114, and a check valve 127 interposed between the both.
And a main part, and an air supply pipe is housed inside the guide column.

The guide pillar G is composed of a first guide member 101 and a second guide member 104. The first guide member 101 is provided with a notch groove 101a reaching from the lower part of the hollow member to the upper end thereof so that the first guide member 101 is located near the side wall Pa of the sand basin P.
It is mounted rotatably around the vertical axis by means of hinge support fittings 102, 102 fixed to a. 101b is a stopper plate fixed to the lowermost end.

The hinge support fitting 102 is the hinge fitting 10
2a and hinge fitting 102b are rotatably connected by a pin 102c. The hinge fitting 102a is the vertical plate 10
It is fixed to the first guide member 101 by 2d and the horizontal plate 102e, and the horizontal plate 102e reinforces the first guide member 101 from the outer periphery. Further, the hinge fitting 102b is fixed to the side wall Pa by a supporting member 102f and a mounting member 102g. Reference numeral 103 denotes an angle setting unit, in which an angle setting member 103a is fixed so as to reinforce the first guide member 101 from the outer periphery, and an angle setting member 103b is fixed to the side wall Pa. Of the many holes 103c formed in the angle setting member 103a, one of the holes is the cutout groove 102a.
The angle is set to match the holes 103d formed in the angle setting member 103b, and the pins 103e are inserted into both holes to set the angle.

The second guide member 104 extends laterally from the vicinity of the upper portion of the first guide member 101 and the supporting member 10 is provided on the side wall Pa.
It is fixed by 5, 105. Second guide member 104
A blind lid 104b is fixed to the tip of the, and a suction part 104a with a silencer is provided in the upper part near the tip.

The upper end of the first guide member 101 and the end of the second guide member 104 are halved to form a hollow bent pipe connecting member 1.
The tabs 106a on both ends are connected by means of 06 and are fastened with bolts or the like.

The water flow generator 107 is a device for generating a water flow by rotating the blades of an axial flow pump or the like which is turned sideways, and the motor shaft 10 in the tip recess 107b of the water flow generator main body 107a.
7c, the rotary shaft 109 of the blade 108 is attached to the friction link 11
It is fixed by 0 and the bolt 111. Further, the water flow generator 107 is fixed to a support base 112, and an underwater blower 114 having an underwater motor 113 is fixed to the upper part of the support base 112.

A standing air supply pipe 115 is erected on a mounting plate 116 of the support 112. This standing air supply pipe 11
5, the lower part is watertightly closed to the support base 112 by the mounting plate 116, and is closed by fixing a blind plate to the upper end. A connecting fitting 118 having an O-ring 117 is provided on the front side, and the rear side is connected to the guided air supply pipe 120 by a connecting air supply pipe 119 for communication. The guided air supply pipe 120 has a lower portion made of a solid pipe and an upper portion made of a flexible pipe such as a hose.
The upper part moves inside the second guide member 104 while being vertically guided by the inside of the first guide member 104.

Reference numerals 121 and 122 denote upper and lower sliding members, and the upper sliding member 121 is adapted to slide inside the first guide member 101, and the guided air supply pipe 12
It is fixed to the lower end of 0 to close the lower end of the guided air supply pipe 120, and is fixed to the standing air supply pipe 115 and the connected air supply pipe 119 by the reinforcing connecting member 123. On the other hand, the lower sliding member 122 is the connecting member 124.
Is fixed to the support base 112 by the first guide member 1
The inside of 01 is slid up and down.

In front of the standing air supply pipe 115, an intake port 114a of the submersible blower 114 is provided by an air supply pipe 125.
Is in communication with.

Reference numeral 126 denotes an air discharge pipe, and the underwater blower 114.
Of the discharge port 114b. This air discharge pipe 1
26 rises upward along the standing air supply pipe 115 and is connected to the check valve 127 above. Check valve 12
The air discharge pipe 128 descends from 7, and the water flow generator 10
7 communicates with an air chamber 129 between the rotary shaft 109 and the rotary shaft 109. Reference numeral 130 is a fixed clamp provided on the support base 112.

The support member 132 on which the chain hoist 131 is suspended is fixed to the first guide member 101 by a lock fitting 132a. The chain of the chain hoist 131 is connected to the submersible motor 113 of the submersible blower 114 so as to raise and lower the support base 112.

133 is a mechanical seal of the motor output shaft 107c, and 134 is a sliding ring.
The space between the peripheral wall of the tip recess 107b of 7a and the rotating shaft 109 of the blade 108 is the air chamber 129.

The rotary shaft 109 is hollow with its tip open, and the blade member 135 is screwed into the tip. In the blade member 135, a plurality of blades 135a and blades 135b are alternately and integrally provided in a passage communicating from the center to the outer periphery. A cylindrical rectifying ring 109b is fixed to the rotating shaft 109 slightly outside the outer circumference of the blade member 135. A plurality of protrusions 109 are provided inside the rectifying ring 109b.
c is provided, and the rectifying ring 109b and the blade member 135 are provided.
The air between and is easily blown out forward. On the rear side of the rotary shaft 109, several communication holes 136 are provided.
Is opened and the hollow portion 109a of the rotating shaft 109 and the air chamber 1 are opened.
29 is communicated with.

Reference numeral 137 denotes a draft ring which is fixed to the support 112 so as to surround the blade 108.
It is used as a guide for increasing the efficiency at the tip of the blade and generating a strong jet swirl flow JF.

Reference numeral 138 is a power supply cable for the water flow generator 107, and 139 is a power supply cable for the underwater blower 114.

Reference numeral 140 is a chain hoist provided on the ceiling, and when the whole underwater aeration and agitation apparatus 100 is lifted up, the hook 140a is hooked on the support member 132 to lock it.
It is configured to be lifted via 32a.

At the upper end of the guided air supply pipe 120, a partition member 141 for slidably holding the guided air supply pipe 120 is provided. This partition member 141
Indicates that the moist air inside the sand basin P is the guided air supply pipe 120.
The second guide member 104 is fitted into the second guide member 104 as shown in FIG.
Main body 141a fixed to the main body with screws or the like, and the main body 141a
It is composed of a rubber packing 141c which is pressed against a by a pressing plate 141b and fixed by a screw or the like.

Next, the operation of the third embodiment will be described.
In a sedimentation basin such as a pump station, the normal water level is W1 in Fig. 8.
Has become. Since this water level is low, the submersible pump at the downstream pump station has stopped, and rainwater accumulates in the sand basin and decomposes.

Therefore, when power is supplied to the water flow generator 107 and the underwater blower 114 by the power supply cable 138 of the water flow generator 107 and the power supply cable 139 of the underwater blower 114, the water flow is generated by the rotation of the blades 108 of the water flow generator 107. Further, the underwater blower 114 changes the atmosphere into the suction portion 104a, the second guide member 104, the guided air supply pipe 120, the connection air supply pipe 119, and the standing air supply pipe 1.
15. After being sucked through the air supply pipe 125 and discharged to the air discharge pipe 126, the check valve 127 is opened to be sent to the air chamber 129 through the air discharge pipe 128. The air in the air chamber 129 passes through the communication hole 136 and enters the hollow portion 109a of the rotating shaft 109, and the blade member 1
35 and the submersible blower 114 pressurize forward, and swirling and stirring are performed in the water flow of the water flow generator 107, and air is mixed into the water as fine particles to prevent the stored water from spoiling.

When it is raining, the amount of water flowing into the sand basin P increases and water is sent to the water supply channel by operating the pump at the downstream pump station. At this time, the water level in the sand basin P becomes W2, and the water flow becomes faster and large dusts also flow in. Therefore, if the support table 112 with the water flow generator 107, the underwater blower 114, etc. is submerged in the water, the dusts will collide. There is a risk of being damaged. Then, the chain hoist 131 is driven to pull up the support base 112 to the position shown by the chain double-dashed line in FIG. At this time, the guided air supply pipe 120 moves the first guide member 1
01 Guided air supply pipe 1 that moves in the upper direction by being guided
Since the upper portion of 20 is a bendable pipe, the upper portion of the guided air supply pipe 120 is sequentially curved to form the second guide member 104.
Move in.

The guided air supply pipe 120 has the first guide member 1
Since it is guided in 01 to move up and down, dust is not collided and damaged, and is guided in the horizontal direction by the second guide member 104 in the upper part, which does not hinder a crane traveling on land.

When the entire submerged aeration and agitation device 100 is to be lifted to the ground for reinforcement inspection, etc., the earpiece 1 of the connecting member 106 is used.
The bolt of 06a is removed, the connecting member 106 is removed, the guided air supply pipe 120 is pulled out from the second guiding member 104, and the hook 140a of the chain hoist 140 on the ceiling is supported by the supporting member 13.
2, the lock member 132a is loosened, the support member 132 is removed from the first guide member 101, and the chain hoist 140 is driven to lift the entire device together with the support member 132 to the ground for repair and inspection.

The angle setting member 103 of the angle setting unit 103 is used to change the angle between the support base 112 and the side wall Pa.
hole 1 of the angle setting member 103a that engages with hole 103d of b
03c may be changed to engage with the pin 103e.

[0062]

According to the submerged aeration and agitation apparatus of the present invention, the air discharge pipe of the underwater blower is provided along the water flow generator so that it is always located in the water. Since a backflow prevention device consisting of a stop valve, a shutoff valve, a safety valve, etc. is provided, even if the air supply to the air chamber is stopped due to a stop operation or a power failure, etc.
The backflow phenomenon of the stored water is regulated by the buffering action of the air chamber and the closing action of the check valve and the shutoff valve, and the abnormally pressurized air is discharged to the air intake pipe by the opening action of the safety valve. Damage is prevented in advance.

In addition, since the air discharge pipe has a simple structure in which it is placed in water as compared with the conventional one, not only is it extremely easy to install and maintain in a reservoir, but also the surface layer of the reservoir. Since effective gas-liquid mixing can be performed at an arbitrary depth from the bottom to the deep layer, there is an excellent advantage that the application of aeration treatment of stored water is greatly expanded.

In the underwater aeration stirrer according to the second aspect, the water flow generator and the underwater blower equipped with the underwater motor are vertically movable along the guide column and are provided on the support base, and the suction side of the underwater blower is provided. , The air supply pipe that is open to the atmosphere is connected, and the discharge side is connected via a check valve to the air supply part that is open near the blades of the water flow generator. Since it is effectively used, has a low noise level, and can be easily moved up and down, there is no risk of collision with dust that has been washed away even when the water level and flow velocity increase.

In the guide column according to claim 3, a first guide member having a notch groove extending from the vicinity of the lower portion of the hollow member to the upper end is provided vertically near the side wall of the sand basin or the like. A hollow second guide member extending laterally from near the upper portion is extended, and the first guide member and the second guide member are connected by a connecting member such as a hollow bent pipe which is divided in half, and the air supply pipe is At least the upper part is configured to move up and down in the first guide member through the notched groove as the flexible pipe, and the upper part moves in the second guide member, so that dust moving by the water flow collides with the air supply pipe. There is no risk of damage to the land, and the upper part of the air supply pipe moves in the horizontal second guide material, so it does not interfere with land objects such as traveling cranes.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross-section of an underwater aeration and agitation device in Example 1.

FIG. 2 is a front view taken along line II-II of FIG.

FIG. 3 is a plan view showing FIG. 1 in an enlarged manner.

FIG. 4 is a plan view taken along line IV-IV in FIG.

FIG. 5 is a side view of the underwater aeration and agitation device in Example 2.

FIG. 6 is an enlarged side view showing a part of FIG. 5 in section.

FIG. 7 is a front view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a side view showing a partial cross-section of the underwater aeration and agitation device in Example 3.

FIG. 10 is an enlarged side view showing a part of FIG. 9 in section.

FIG. 11 is a front view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a partially enlarged view of FIG.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

1, 50, 100 Underwater aeration stirrer 2A, 51, 107 Water flow generator 2B, 58, 114 Underwater blower 58a Suction port 5, 56, 112 Support stand 113 Underwater motor 10, 51c, 107c Motor output shaft 11, 53, 109 Rotating shaft 12, 51a, 107a Water flow generator main body 19, 52, 135a135b Blade 15, 65, 129 Air chamber 21, 59, 61, 115, 119, 120, 125
Air supply pipe 22, 62, 64, 126, 128 Air discharge pipe 25, 63, 127 Check valve 24 Air chamber 26 Shut-off valve 27 Safety valve 23 Backflow prevention device 3, 69, 101, G Guide column 101 First guide member 101a Notch groove 104 Second guide material P Reservoir, sand basin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinori Kishimoto 1-1, Shinmeiwa-cho, Takarazuka-shi, Hyogo Shinmeiwa Industry Co., Ltd. Industrial Machinery Division (72) Inventor Shin Yamamoto 1-chome, Kamiochiai, Shinjuku-ku, Tokyo No. 18 (72) Inventor Yoichi Yasukawa 4-24-12 Shonan Takatori, Yokosuka City, Kanagawa Prefecture (72) Inventor Noboru Okazaki No. 19-7-108 Kamiishikami, Nerima-ku, Tokyo (72) Inventor Togo Exhibition 5-13-12 Kitashinagawa, Shinagawa-ku, Tokyo

Claims (3)

[Claims] 1. A guide column is erected in the depth direction of the reservoir,
An underwater aeration stirring device in which a support base that supports a water flow generator and an underwater blower is provided to be vertically movable on the guide pillar, and the water flow generator has blades provided on a rotating shaft connected to a motor output shaft. A water flow is generated by the rotation of the lever, and an air chamber whose front and rear are sealed is provided between the rotary shaft and the main body of the water flow generator, and the air discharge pipe of the underwater blower is always It is connected to the air chamber along the water flow generator so that it is located underwater, and the air in the air chamber is discharged near the blades of the water flow generator and is discharged from the water flow generator together with the water flow. The air discharge pipe is provided with a backflow prevention device including an air chamber, a check valve, a shutoff valve, a safety valve, and the like, which is an underwater aeration and agitation device. 2. A water flow generator for rotating a blade provided with a rotary shaft to generate a water flow, and an underwater blower equipped with an underwater motor are provided on a support base that can be moved up and down along a guide column. The suction side of the submersible blower is connected to an air supply pipe open to the atmosphere, and the discharge air of the submersible blower is designed to flow out to the vicinity of the blade of the water flow generator through a backflow prevention device. Characterized underwater aeration stirring device. 3. The guide pillar is provided with a first guide member having a notch groove extending from the vicinity of the lower portion of the hollow member to the upper end in the vertical direction near the side wall of a sand basin or the like, and near the upper portion of the first guide member. A hollow second guide member is laterally extended from the first guide member and the second guide member are connected by a connecting member such as a hollow bent pipe which is divided in half, and the air supply pipe has at least an upper portion. The aeration stirring in water according to claim 2, wherein the agitating device is configured to be bendable so as to move up and down in the first guide member through the cutout groove and move upward in the second guide member. apparatus.