JP4255813B2 - Fine air supply device - Google Patents

Description

  The present invention relates to a fine air supply device used to purify water by supplying fine air (oxygen) to water such as rivers, dams, ponds or swamps where water pollution is advanced.

  For example, in water, such as rivers, dams, ponds or swamps, where water pollution has advanced, for example, bad odor due to hydrogen sulfide is generated, and corrosion of reinforced concrete pipes becomes a problem. It has been. Here, air (or oxygen) is injected (aerated) into water to supply oxygen, and the amount of dissolved oxygen in water is increased to aerobic conditions to suppress the activity of sulfate-reducing bacteria, such as hydrogen sulfide. It is known that the occurrence of can be prevented.

  FIG. 5 shows an example of a conventional fine air supply apparatus in which air is injected (aerated) into this type of water to increase dissolved oxygen in the water. This fine air supply apparatus has a pump 10 installed on land, a suction pipe 12 connected to the suction side of the pump 10, and a discharge pipe 14 connected to the discharge side. For example, the pipe 12 and the discharge pipe 14 are arranged with their lower ends submerged in water flowing in a river or the like. An air suction port 16 is provided slightly upstream of the pump 10 of the suction pipe 12, and a fine air generator 18 made of, for example, a nozzle or an orifice is interposed inside the discharge pipe 14.

  According to this fine air supply device, as the pump 10 is operated, water in a river or the like is sucked into the pump 10 through the suction pipe 12, and at this time, air is sucked by the negative pressure generated on the suction side of the pump 10. Air is sucked from the mouth 16 and air is mixed into the water sucked into the pump 10. Then, for example, the water mixed with air is pressurized by the fine air generator 18 composed of a pump, and the air (or oxygen) is dissolved in the water by the pressure. Air is generated, and the water in which the fine air is generated is returned (supplied) into the water flowing through the river or the like, so that the water of the river or the like is aerated.

  However, in the above conventional example, a pump is installed at a place where the water level fluctuates and the height between the air inlet and the water surface, that is, the suction water level H (see FIG. 5) fluctuates, such as a river or a dam. When aeration is performed, for example, when the water level drops, the negative pressure on the suction side of the pump increases and the amount of air (or oxygen) sucked increases, resulting in failure to satisfy the specified performance of the pump. Water may fall and become unable to send water. On the other hand, when the water level rises, the negative pressure on the suction side of the pump becomes small, the amount of air sucked is reduced, and the target supply air amount is reduced.

  The present invention has been made in view of the above circumstances, and even when installed in a place where the water level fluctuates, such as a river or a dam, and aeration is performed, it is possible to stably supply water in which a desired amount of air is taken in. An object of the present invention is to provide a fine air supply device.

The invention according to claim 1 includes a pump, a suction pipe having an air suction port for sucking air therein, connected to the suction side of the pump, and a fine air generator, and a discharge side of the pump. In a fine air supply device having a discharge pipe connected to a water level meter, a water level meter for detecting the suction water level of a pump is provided, and the amount of air sucked into the suction pipe from the air suction port by a signal from the water level meter A fine air supply apparatus having an air intake amount control unit for controlling.

  Thus, for example, when the water level drops and the negative pressure on the suction side of the pump increases, the amount of air to be sucked is limited, while the water level rises and the negative pressure on the suction side of the pump decreases. Sometimes, by controlling the air intake amount so that the amount of air to be sucked in increases, the negative pressure on the suction side of the pump increases, the intake air amount becomes too large, or the negative pressure on the suction side of the pump It is possible to prevent the amount of air to be sucked from becoming too small.

According to a second aspect of the present invention, a plurality of the air suction ports are provided in the suction pipe, and the air suction amount control unit is provided in the air suction pipe connected to the air suction port and the air suction pipe. a fine air supply device according to claim 1, characterized in that it has a plurality of air intake section having a switching valve for opening and closing a signal from the water level gauge.
Thus, for example, when the water level drops and the negative pressure on the suction side of the pump increases, the amount of air sucked is restricted by sucking air from a small number (for example, one) of air suction portions, water level up, when the negative pressure of the suction side of the pump becomes smaller, Ru can increase the amount of intake air by sucking air from the air intake section of the number (e.g., two).

The invention according to claim 3, wherein the air inlet is in the fine air supply device according to claim 2, wherein the provided Turkey to height different positions along the vertical direction of the suction pipe is there.
Thereby, for example, when the water level drops and the negative pressure on the suction side of the pump increases, the air intake amount is limited by sucking air from the air suction portion with a lower negative pressure located below, On the other hand, when the water level rises and the negative pressure on the suction side of the pump decreases, the amount of air sucked can be increased by sucking air from the air suction portion with a higher negative pressure located above.

According to a fourth aspect of the present invention, the air intake amount control unit controls an opening degree of an air intake pipe connected to the air intake port and a signal from the water level gauge provided in the air intake pipe. a fine air supply device according to claim 1, characterized in that it has an air inlet section and an adjustment valve.
Thus, for example, when the water level drops and the negative pressure on the suction side of the pump increases, the opening of the opening adjustment valve is reduced or the number of open / closed valves is changed to change the number of open / closed valves. If the air intake volume is limited, and when the water level rises and the negative pressure on the suction side of the pump decreases, the opening of the opening adjustment valve can be increased, or the number of open / closed valves can be changed. The amount of air sucked from the air suction section can be increased.

The invention described in 請 Motomeko 5, the load on the motor that drives the pump, by detecting the variation of the pump discharge pressure or discharge flow rate, to control the rotational speed of opening or motor of the opening regulating valve Thus, it is possible to automatically adjust the air intake amount and discharge the air remaining in the pump.

  According to the present invention, a desired amount of air (generally the maximum amount of air that does not cause a problem such as falling water) is taken in even when aeration is performed by installing in a place where the water level fluctuates, such as a river or a dam. Stable water can be supplied stably, whereby stable aeration can be continuously performed.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4 and FIG. 6. 5 that are the same as or equivalent to those in the conventional example shown in FIG.
FIG. 1 shows a fine air supply apparatus according to an embodiment of the present invention. This fine air supply device is provided in a horizontal portion of a water level meter 20 for detecting a water level sucked up by a pump 10 such as a river, that is, a suction water level H, and a suction pipe 12 connected to the suction side of the pump 10. Further, an air intake amount control unit 24 having a plurality (two in this example) of air intake units 22 is provided. Each air suction part 22 is configured by connecting an air suction pipe 28 provided with a switching valve 26 to a plurality (two in the figure) of air suction ports 16 a formed in the horizontal part of the suction pipe 12. . Then, the signal from the water level gauge 20 is input to the setter 30, and each switching valve 26 opens and closes by the signal from the setter 30 to shut off or open the air suction pipe 28. The suction pipe 28 is opened at the same time, or one is opened.

  According to this example, when the pump 10 is operated, water such as a river is sucked into the pump 10, and at this time, both the two air suction portions 22 or the two air suction portions 22 are generated by the negative pressure generated on the suction side of the pump 10. Air is sucked into the pump 10 from one side, and the air is mixed into the water sucked into the pump 10. Then, for example, the water mixed with air is pressurized by the fine air generator 18 composed of a pump, and the air (or oxygen) is dissolved in the water by the pressure. Air is generated, and the water in which the fine air is generated is returned (supplied) into the water flowing through the river or the like, so that the water of the river or the like is aerated.

  At this time, for example, when the water level gauge 20 detects that the water level has fallen below a predetermined reference, this signal is input to the setting device 30, and only one of the switching valves 26 is opened by the output signal from the setting device 30. Thus, air is sucked into the pump 10 from only one of the air suction portions 22. As a result, the resistance of air passing through only one of the air suction portions 22 and flowing into the pump 10 is increased, thereby limiting the amount of air sucked. On the other hand, when the water level gauge 20 detects that the water level has risen above a predetermined reference, this signal is input to the setter 30, and both switching valves 26 are opened by the output signal from the setter 30 to Air is sucked into the pump 10 from both of the air suction portions 22. As a result, the resistance of air passing through both of the air suction portions 22 and flowing into the pump 10 is reduced, and the amount of air sucked is increased.

  Thereby, as the suction water level H changes, the negative pressure on the suction side of the pump 10 increases and the amount of air sucked increases, or the negative pressure on the suction side of the pump 10 decreases and the amount of air sucked. , And a stable supply of water that has taken in a desired amount of air (generally the maximum amount of air that does not cause problems such as falling water) to maintain stable aeration. It can be carried out.

In this example, two air suction units 22 are provided, but it is needless to say that more than three air suction units may be provided to perform finer control. . Further, instead of the air suction pipe 28, a throttle valve or an orifice may be used, and an open / close valve may be provided to form an air suction portion.
Furthermore, as shown in FIG. 6, for example, a thin pipe 40 with an on-off valve 42 inside and a thick pipe 44 with an on-off valve 46 inside are arranged in parallel, and one pipe 40 or 44 is selected. The air injection amount may be controlled by changing the flow rate of the air to be sucked by inhaling air. Although not shown, the air injection amount may be controlled by changing the flow rate of the sucked air through a throttle.

  FIG. 2 shows a fine air supply apparatus according to another embodiment of the present invention. This example differs from the example shown in FIG. 1 in that an air suction part 22a configured by connecting an air suction pipe 28a provided with an opening adjustment valve 32 to an air suction port 16b formed in the horizontal part of the suction pipe 12. It is the point provided with the air intake amount control part 24a which has. Other configurations are the same as those shown in FIG.

  According to this example, for example, when the water level gauge 20 detects that the water level has dropped, this signal is input to the setting device 30, and the opening degree of the opening adjustment valve 32 is throttled by the output signal from the setting device 30. Then, air is sucked into the pump 10 from the air suction portion 22a. As a result, the resistance of air passing through the air suction portion 22a and flowing into the pump 10 is increased to limit the amount of air sucked. On the other hand, when the water level gauge 20 detects that the water level has risen, this signal is input to the setting device 30, and the opening of the opening adjustment valve 32 is expanded by the output signal from the setting device 30, so that the air intake section Air is sucked into the pump 10 from 22a. As a result, the resistance of the air passing through the air suction portion 22a and flowing into the pump 10 is reduced and the amount of air sucked is increased.

  FIG. 3 shows a fine air supply apparatus according to still another embodiment of the present invention. This example differs from the example shown in FIG. 1 in that an air suction pipe provided with a switching valve 26a in a plurality (three in the figure) of air suction ports 16c formed at different height positions of the vertical portion of the suction pipe 12. This is the point that an air intake amount control unit 24b having an air intake unit 22b configured by connecting 28b is provided.

  According to this example, for example, when the water level gauge 20 detects that the water level has fallen below a predetermined position, this signal is input to the setting device 30, and the output signal from the setting device 30 is, for example, the lowest position. Only the switching valve 26a of the air suction portion 22b to be opened is opened and the other switching valves are closed, and air is sucked into the pump 10 only from the lowest air suction portion 22b. As a result, the amount of air sucked is limited by allowing air to flow into the pump 10 from the air suction portion 22b having the smallest negative pressure. On the other hand, when the water level gauge 20 detects that the water level has risen above a predetermined position, this signal is input to the setting device 30, and the output signal from the setting device 30, for example, the air suction portion 22 b located at the uppermost position. Only the switching valve 26a is opened, the other switching valves are closed, and air is sucked into the pump 10 only from the air suction portion 22b located at the uppermost position. Thus, the amount of air sucked is increased by allowing air to flow into the pump 10 from the air suction portion 22b having the greatest negative pressure.

FIG. 4 shows another fine air supply device. The fine air supply apparatus of this example is sucked into the pump 10 through the air suction part 22c provided in the horizontal part of the suction pipe 12 connected to the suction side of the pump 10 and the air suction part 22c. An air intake amount control unit 24c having an air intake amount measuring device 34 for measuring the air amount is provided. Each air suction part 22c is configured by connecting an air suction pipe 28c having an opening degree adjusting valve 32a to an air suction port 16d formed in the horizontal part of the suction pipe 12, and the opening degree of the air suction pipe 28c. An air intake amount measuring device 34 is installed on the downstream side of the regulating valve 32a. A signal from the air intake amount measuring device 34 is input to the setting device 30, and the opening of the opening adjusting valve 32 a is feedback-controlled by the signal from the setting device 30.

  According to this example, when the air intake amount measuring device 34 detects that the air intake amount to the pump 10 is large, the air intake amount of the pump is decreased by narrowing the opening degree of the opening adjustment valve 32a. When the air intake amount measuring device 34 detects that the air intake amount to 10 is small, the air intake amount of the pump is increased by increasing the opening degree of the opening adjustment valve 32a. As a result, it is possible to prevent the amount of air to be sucked too much or the amount of air to be sucked from becoming too small.

  In addition, you may make it prevent a water fall with a control apparatus. In other words, it detects signs of air lock from the current value of the pump or the pressure gauge, and (1) closes the air inlet, (2) operates the vacuum pump, etc. for a certain time or the current value of the pump Stop the air injection until the pressure gauge or pressure gauge reaches a normal value (or eliminate the air in the pump with a vacuum pump), and send only water to control the air in the pump. Also good.

It is a schematic diagram which shows the fine air supply apparatus in embodiment of this invention. It is a schematic diagram which shows the fine air supply apparatus in other embodiment of this invention. It is a schematic diagram which shows the fine air supply apparatus in other embodiment of this invention. It is a schematic diagram which shows another fine air supply apparatus. It is a schematic diagram of the conventional fine air apparatus. It is a figure which shows the other example of an air suction part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump 12 Intake pipe 14 Discharge pipe 16, 16a, 16b, 16c, 16d Air inlet 18 Fine air generator 20 Water level gauge 22, 22a, 22b, 22c Air inlet part 24, 24a, 24b, 24c Air intake amount control Part 26, 26a switching valve 28, 28a, 28b, 28c air intake pipe 30 setting device 32, 32a opening adjustment valve 34 air intake amount measuring device

Claims (5)

A pump,
A suction pipe having an air suction port for sucking air therein and connected to the suction side of the pump;
In a fine air supply device having a fine air generator and a discharge pipe connected to the discharge side of the pump ,
Fine air , comprising a water level meter for detecting the suction water level of the pump, and having an air suction amount control unit for controlling the amount of air sucked into the suction pipe from the air suction port by a signal from the water level meter Feeding device. A plurality of the air suction ports are provided in the suction pipe, and the air suction amount control unit is provided with an air suction pipe connected to the air suction port and a switching provided in the air suction pipe to be opened and closed by a signal from the water level gauge. fine air supply device according to claim 1, characterized in that it has a plurality of air suction unit that includes a valve. The air inlet, the suction tube micro air supply device according to claim 2, wherein the provided Turkey to height different positions along the vertical direction. The air intake quantity control unit, the air suction pipe connected to the air inlet and said air air suction portion having a opening regulating valve for controlling the opening in provided in the suction pipe signal from the water gauge The fine air supply device according to claim 1, comprising: 5. The fine air according to claim 4 , wherein the opening of the opening adjusting valve or the rotational speed of the motor is controlled by detecting a load, a pump discharge pressure or a discharge flow rate of the motor driving the pump. Feeding device.

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