JPH0131360Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention mixes wastewater from houses or factories, liquid manure from livestock, etc. containing sludge made of organic substances with oxygen in the air, and ferments and decomposes it. The present invention relates to an aeration device for such purposes, and particularly relates to an aeration device of the type in which an ejector for mixing air is attached to the discharge port of a vertical shaft submersible motor pump.

(Prior Art) As shown in FIG. 6, in a conventional aeration device of this type, an ejector 3 is attached to the discharge port of a vertical shaft submersible motor pump 2 driven by a submersible motor 1. In addition, air is introduced from the outside through a conduit 4. As shown in FIG. 7, the aeration device 5 configured in this manner has two walls 6a, 6a,
It was attached at a position equidistant from 6b and offset to one side 6b of the other side wall.

Therefore, when the pump 2 is operated, air is sucked in from the outside through the conduit 4 by the action of the ejector 3 attached to the pump discharge side, and this sucked air is mixed with the processing liquid sucked in by the pump 2. Then, it is discharged from the discharge section 7 into the aeration tank 6. In this way, the liquid to be treated in the aeration tank is mixed with oxygen in the air and fermented and decomposed.

However, as described above, the conventional aeration device having the structure in which the ejector is attached to the discharge port of a standard vertical shaft submersible motor pump has only one discharge port 7 of the ejector, and therefore has the following drawbacks.

(i) It was unsuitable for large-scale aeration equipment.

(ii) Since the gas-liquid mixture is discharged in only one direction,
The aeration area was narrow, and the device was installed next to a wall, limiting aeration to only one direction.

(iii) Since the discharge port is in only one direction, the reaction force of the discharge force acts on the casing, and therefore it is necessary to strengthen the method of fixing the pump. Furthermore, since this type of device is generally a detachable submersible pump, the attachment and detachment mechanism also requires a strong structure.

(Problems to be solved by the invention) The invention eliminates the drawbacks of the prior art described above,
To be able to aerate a wide range of surrounding areas by installing it in the center of an aeration tank, and to prevent the reaction of the discharge force of the flow discharged from the discharge port from having a large effect on the method of fixing the casing. It is in.

(Means for solving the problem) The present invention arranges a plurality of ejectors at approximately equal intervals around the outer periphery of a casing in which the impeller of a vertical pump is installed in the center, and the intake pipe of each ejector is It is characterized by communicating with outside air, and the aeration device configured in this way can be used by being installed near the bottom center of the aeration tank.

(Function) The present invention is configured as described above, so that
The liquid to be treated in the aeration tank is sucked in from the suction port of the vertical shaft pump installed in the center of the casing, is discharged from the pump impeller outlet, and is guided to the nozzles of multiple ejectors installed on the outer periphery of the casing. When air is injected from the nozzle at a high speed, the ejector action sucks air through the intake conduit, mixes it with the liquid to be treated that is injected from the nozzle, and injects the mixture into the aeration tank.

Since a large number of the above-mentioned nozzles are arranged at approximately equal intervals around the outer periphery of the casing, by installing the aeration device in the center of the aeration tank, it is possible to aerate the entire surrounding area within the aeration tank. I can do it.
Further, since the reactions of the ejection forces from each nozzle act to cancel each other out, the method of attaching the casing is not significantly affected.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of an aeration device with multiple discharge ports and an ejector showing a first embodiment of the present invention, and FIG. 2 is a sectional view of the main part taken along the line - in FIG. 1. In the figure, an impeller 12 of a vertical shaft submersible motor pump driven by a submersible motor 11 is attached to a circular casing 1.
3, and a suction port bell mouth 14 is provided at the lower center of the casing 13,
Further, a plurality of ejectors 15 (eight in the figure) are disposed on the outer circumference at approximately equal intervals and symmetrically with respect to the center, and are attached via conduits 16. A nozzle 15a connected to the conduit 16 is installed inside each of these ejectors 15, and an intake pipe 17 for sucking air around the tapered end of the nozzle is shown in the enlarged view of the main part in FIG. As shown in FIG. 1, each intake pipe 17 is connected in a radial direction to a main air pipe 17a whose one end is attached to the top of the motor 11 and the other end is open to the outside air.
It is connected to the outside air via a. In the figure, 1
Reference numeral 8 indicates a support frame for fixedly supporting the casing 13 on the floor, and reference numeral 19 indicates an attachment for a lifting wire rope 20 provided on the main intake pipe 17a.

The aeration device 10 configured as described above is installed in the fourth
As shown in the figure, when installed at the center of the bottom of the aeration tank 6 and driving the pump impeller 12, the suction port 14
The liquid to be treated such as sludge containing organic substances in the tank 6 is discharged from the impeller outlet into the casing 13, and some of the velocity energy is converted into pressure energy. The pressure fluid discharged into the casing 13 is then injected from the nozzle 15a of the ejector 15 through the conduit 16, and due to the ejector action that occurs at this time, outside air is sucked through the intake pipe 17 and is aerated as a gas-liquid mixture. The liquid to be treated is discharged into the tank 6, and the liquid to be treated is mixed with the oxygen in the sucked air in the tank 6, thereby performing an aeration action that promotes fermentation and decomposition.

According to this embodiment, (i) the aeration device 10 is installed at the center of the bottom of the aeration tank 6, and a gas-liquid mixture is discharged radially from a plurality of ejectors 15 attached to the outer periphery of the casing 13; Therefore, it becomes possible to aerate the entire area around the aeration tank 6, and therefore, it becomes possible to aerate on a large scale and over a wide range.

(ii) Since a plurality of ejectors are arranged at approximately equal intervals on the periphery of the casing in symmetrical positions with respect to the center, the reaction of the ejection force from the nozzle of each ejector is (and the reaction force of the ejection force from the nozzle of the ejector) that cancel each other out. Therefore, the force acting on the casing installation and fixing mechanism is reduced, and in some cases, fixing can be made unnecessary.

(iii) The intake pipe 17 of each ejector 15 is connected to the motor 11
Air is taken in through a single main intake pipe 17a attached to the top of the aeration system, and the main intake pipe can be used as a location for installing a lift when inspecting the aeration system.

FIG. 5 is a side view showing the second embodiment of the present invention, and among the symbols shown in this drawing, the same symbols as those shown in FIGS. 1 and 2 refer to the same or similar parts. shall be indicated. In this embodiment, whereas the first embodiment (FIG. 2) has a floor-standing structure in which the casing 13 is installed and fixed at the bottom of the tank via the support frame 18, this embodiment is simple. It is a removable type. In the figure, 21 is
A support member 21 is formed at the bottom of an appropriate number of at least three ejectors 15, and these support members 21 are placed on each support stand 22 formed at a corresponding position on the bottom of the aeration tank. and the ejector 15
Therefore, in order to prevent the casing 13 from moving relative to the support stand 22, a guide pipe 23 installed in the support stand 22 is provided with a guide pipe 23 so that the end of the arm 24 attached to the casing 13 can slide in the vertical direction. is mated to. In the figure, 17b indicates the main intake hose.

According to this embodiment, the aeration device can be detachably mounted on the bottom support of the aeration tank, which is convenient when moving it within the tank.

In addition, in the first embodiment, the casing containing the pump impeller in the center was described as having a circular shape, but the casing does not necessarily have to be circular, and may be formed in an elliptical shape depending on the shape of the aeration tank. It is also possible to do so.

Regarding the number of ejectors and their arrangement,
The number of ejectors can be selected as appropriate depending on the size of the aeration tank, etc., and their arrangement must also be symmetrical about the center in order to cancel out the reaction force of the discharge force from the nozzle. There is no need to
For example, when three ejectors are used, the reaction force of the ejection force against the casing can be balanced as a whole by arranging each ejector at the apex of an equilateral triangle.

Furthermore, regarding the mounting angle of each ejector on the outer periphery of the casing, in each of the above embodiments, the installation angle of each ejector was explained as being mounted in the radial direction. In order to effectively guide the impeller to the ejector, it is possible to provide a guide plate or the like as appropriate inside the casing, or to provide the ejector at an angle in the direction of rotation of the impeller.

(Effects of the invention) As explained above, according to the invention, a plurality of ejectors are attached to the outer periphery of the casing in which the impeller of the vertical shaft pump is built in the center. It can be installed and used in the center of the bottom, and by using it in this condition, it is possible to aerate the entire area around the aeration tank. Aeration is possible.

In addition, by arranging the ejectors at approximately equal intervals around the outer circumference of the casing, the reaction of the ejection force from the ejectors almost cancels each other out, reducing the force acting on the fixing mechanism of the device, and in some cases Fixation can be made unnecessary.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an ejector type aerator with multiple discharge ports showing the first embodiment of the present invention, Fig. 2 is a sectional view of the main part taken along the - line in Fig. FIG. 4 is an explanatory view showing the above aeration device installed and used in an aeration tank; FIG. 5 is a side view showing a second embodiment of the present invention; FIG. is a cross-sectional view of the main parts of a conventional ejector type aeration device,
FIG. 7 is an explanatory diagram showing the state of use thereof. 11... Submersible motor, 12... Vertical pump impeller, 13... Casing, 15... Ejector, 1
7... Intake pipe, 17a... Main intake pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In an aeration system in which an ejector for mixing air is attached to the discharge port of a vertical shaft submersible motor pump, there are multiple An ejector type aeration device with multiple discharge ports, characterized in that several ejectors are arranged, and the intake pipe of each ejector is communicated with the outside air. 2. The ejector type aeration device with multiple discharge ports according to claim 1, wherein a plurality of ejectors are disposed on the outer periphery of the casing and are arranged radially in symmetrical positions with respect to the center. 3. The ejector type aeration device with multiple discharge ports according to claim 1, wherein one end of the intake pipe of each ejector is attached to the top of the motor and the other end is connected to a main intake pipe open to the outside air.