JPH0312392Y2 - - Google Patents

Description

[Detailed explanation of the idea] (1) Purpose of the invention The present invention relates to an underwater aeration device.

Conventionally, for aeration into water, as shown in FIG. 3, the pump spout 6' is constricted into a nozzle shape, and a ventilation conduit 8 is routed from the peripheral wall of the gas-liquid mixing cylinder 11' to the outer periphery of the pump spout 6'. Due to the structure in which the terminal end of the pump is opened for introduction, when the impeller 3' in the pump vortex chamber 5' is rotated to send pressurized water from the pump spout 6' into the gas-liquid mixing cylinder 11', its jet action is As a result, the pressure is reduced around the outer circumference of the pump spout 6', and air in the atmosphere is sucked from the intake conduit 8' to the surrounding surface of the jet water column, causing a mixing action in the gas-liquid mixing tube 11' and discharging the air into the jet nozzle 13. A method was adopted in which a gas-liquid mixture was released from '.

It is desirable that such an aeration device sufficiently mixes gas and liquid at a constant ratio. However, in the conventional simple injection action from the nozzle-shaped constricted pump outlet 6', gas-liquid contact occurs only on the outer peripheral surface of the injected water column, and there is no effect on the center of the injected water column. Therefore, the air suction action and mixing effect are poor, and the air mixing ratio cannot be kept constant due to changes in water pressure, etc.

The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks and provide an aeration device that has excellent air suction and mixing effects and can maintain a constant air mixing ratio regardless of changes in water pressure, etc. It's about doing.

(2) Structure of the invention In the underwater aeration system of the invention, a propeller is fitted onto the output shaft of the submersible motor and housed in a liquid passage chamber, and a suction port is opened on one side of the liquid passage chamber, and the propeller and A water spout concentric with the flow straightener is opened forward, the flow straightener is led out from the center of the propeller, penetrates the center of the water spout, and an annular surrounding chamber is provided around the outer periphery of the water spout, and the outer wall thereof is The connection port of the ventilation conduit is opened, and an annular groove along the edge of the water spout is provided on the inner periphery of the surrounding chamber to form an annular nozzle that communicates with the inside of the gas-liquid mixing cylinder described below. has a structure in which a gas-liquid mixing cylinder is attached which communicates with the liquid passage chamber, and the tip of the gas-liquid mixing cylinder is opened into the water as an injection port for the gas-liquid mixture.

To explain the embodiments in FIGS. 1 and 2, 1 is a submersible motor submerged in water with a predetermined installation structure, 2 is a lead-out shaft of the submersible motor 1, and 3 is fitted to the lead-out shaft 2. It is a propeller and is housed in a liquid passage chamber 5 having a suction port 4 on one side. A water spout 6 is opened in the front of the liquid passage chamber 5, and the water spout 6 is concentric with the propeller 3 and the rectifying tube 14 described later.
An annular surrounding chamber 7 is provided around the outer periphery of the container. By opening the connection port 9 of the ventilation conduit 8 on the outer wall of the surrounding chamber 7 and providing an annular groove 10 along the edge of the spout 6 on the inner periphery of the surrounding chamber 7, gas-liquid mixing as described below can be achieved. An annular nozzle 12 is formed leading into the tube 11 . A gas-liquid mixing cylinder 11 is attached to the front of the annular nozzle 12 and communicates with the liquid passage chamber 5, and the tip thereof is opened into the water as an injection port 13. Reference numeral 14 denotes a rectifier tube led out from the center of the propeller 3, and the existence of the rectifier tube 14 causes the water outlet 6 to be formed in an annular shape.

When the propeller 3 in the liquid passage chamber 5 rotates due to the drive of the submersible motor 1, water sucked into the liquid passage chamber 5 from the suction port 4 passes through the water spout 6 and flows into the gas-liquid mixing cylinder 11.
However, when the pressurized water is sent from the spout 6 into the gas-liquid mixing cylinder 11, atmospheric air sucked into the annular surrounding chamber 7 from the intake conduit 8 passes through the annular groove gap 10. The annular nozzle 12 passes through the gas-liquid mixing cylinder 1.
Flows into 1. The pressurized water sent out from the water spout 6 becomes twisted by the swirling action of the propeller 3, and is sent out in a hollow shape along the rectifier cylinder 14,
Furthermore, since the air sucked into the surrounding chamber 7 tends to flow in the axial direction of the gas-liquid mixing cylinder 11 through the annular nozzle 12, the gas-liquid contact effect reaches the center of the pressure water, and the gas-liquid After sufficient mixing in the mixing cylinder 11, the gas-liquid mixture is discharged from the injection port 13.

(3) Effects of the invention In the conventional simple injection action from the nozzle-shaped constricted pump discharge port 6', gas-liquid contact occurs only on the outer peripheral surface of the injected water column, and the center of the injected water column Since it has no effect on the air, it has poor air suction and mixing effects, and it also becomes impossible to maintain a constant air mixing ratio due to changes in water pressure, etc.

In contrast, the pressurized water from the water spout 6 in the device of the present invention becomes twisted due to the swirling action of the propeller 3 and is sent out in a hollow shape along the straightening tube 14, and is also sucked into the atmosphere through the ventilation conduit 8. Since the air tends to flow in the axial direction of the gas-liquid mixing cylinder 11 through the annular surrounding chamber 7 and through the annular nozzle 12, the gas-liquid contact effect reaches the center of the pressure water, and the gas-liquid mixing cylinder The gas-liquid mixture is sufficiently mixed within 11 and discharged from the injection port 13.

As described above, the device of the present invention has the advantage that it has excellent air suction and mixing effects, and that the air mixing ratio can be kept constant regardless of changes in water pressure.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of the main parts of the underwater aeration system of the present invention, Figure 2 is an enlarged vertical side view of the spout and annular nozzle in the underwater aeration system of the present invention, and Figure 3 is the main parts of the conventional underwater aeration system. FIG. DESCRIPTION OF SYMBOLS 1... Submersible motor, 2... Output shaft, 3... Propeller, 4... Suction port, 5... Liquid passage chamber, 6... Water outlet, 7... Annular surrounding chamber, 8... Ventilation conduit, 9
... Connection port, 10 ... Annular groove gap, 11 ... Gas-liquid mixing cylinder, 12 ... Annular nozzle, 13 ... Injection port,
14... Rectifier tube.

Claims (1)

[Scope of utility model registration request] A propeller 3 is fitted onto the output shaft 2 of the submersible motor 1 and housed in a liquid passage chamber 5, and a suction port 4 is provided on one side of the liquid passage chamber 5, and the propeller 3 is arranged concentrically with the propeller 3 and a rectifying cylinder 14 described later. The discharge port 6 is opened forward, the straightening tube 14 is led out from the center of the propeller 3 and penetrates the center of the water spout 6, and an annular surrounding chamber 7 is provided around the outer periphery of the water spout 6. A connection port 9 of the ventilation conduit 8 is opened in the outer wall, and an annular groove 10 is provided on the inner periphery of the surrounding chamber 7 along the edge of the water spout 6 to form an annular nozzle 12 that communicates with the inside of the gas-liquid mixing cylinder 11 described later. None, the annular nozzle 12 is characterized in that a gas-liquid mixing cylinder 11 communicating with the liquid passage chamber 5 is attached in front of the annular nozzle 12, and the tip of the gas-liquid mixing cylinder 11 is opened into the water as an injection port 13. Underwater aeration equipment.