JP2522023Y2 - Underwater stirrer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater stirrer used for stirring and mixing stored water in fish ponds, sewage treatment tanks, and reservoirs of chemical plants.

[0002]

2. Description of the Related Art In a conventional underwater stirrer, a draft ring surrounding the impeller is provided on an impeller that generates a water flow, and stored water sucked into the draft ring by the impeller is:
An effective stirring / mixing process was performed by being pushed forward as a strong jet swirling flow.

[0003]

[Problem to be solved by the invention] However, the stirring and mixing action by the impeller and the draft ring is effectively performed in a deep reservoir, for example, near a water surface of a deep reservoir or in a shallow pond. When the underwater stirrer is operated, the flow velocity of the water surface increases due to the suction action of the impeller, and a suction vortex is generated to attract air on the water surface.

[0004] Vibration occurs due to the suction vortex, and the respective tightening bolts are dislodged or the mechanical seal is damaged, so that not only the repair cost is increased but also the equipment reliability is reduced due to frequent interruption of operation. There was a problem.

[0005] In view of such conventional circumstances, an object of the present invention is to provide a submersible stirrer that does not generate a suction vortex even when operated in a shallow water reservoir or the like.

[0006]

The underwater stirrer of the present invention is provided with a submersible motor having an impeller and a draft ring surrounding the impeller at a tip end thereof, which can be moved up and down in water by a guide member. A deflector for preventing the generation of a suction vortex is attached to the underwater motor, and the deflector is provided with a deflecting length from the underwater motor to the front of the impeller and the draft ring, and a submersible motor along the deflecting length. Is formed to have a size that can cover an upper part of a deflecting width that extends to both right and left sides of the sheet.

[0007]

In the above construction, when the stored water is sucked into the impeller by the drive of the underwater motor, the stored water on the water surface located immediately above the impeller is moved along the deflector plate on both sides of the impeller. By diverting to the direction, the flow velocity of the stored water on the water surface portion is reduced, so that no suction vortex is generated on the water surface portion.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

The underwater stirrer 1 shown in FIGS. 1 and 2 is used for stirring and mixing the stored water W stored in a shallow reservoir P having a depth D, and includes a bed 2, a guide member 3, a submersible motor 4, The impeller 5, the draft ring 6, and the deflector 7 are configured as main parts.

The guide member 3 has a main body 3b erected on a substrate 3a. The substrate 3a is provided on one end of the bed 2 fixed to the pond bottom B, and a bracket is provided on the outer periphery of the main body 3b. 8 is fitted so as to be able to move up and down. Body 3
The sectional shape of b is rectangular or circular.

The underwater motor 4 can be raised and lowered in the stored water W by connecting the base end to the bracket 8, and the impeller 5 is attached to the output shaft 4a protruding from the front end. For the casing of the underwater motor 4, etc.
A draft ring 6 surrounding the impeller 5 is attached.

Further, a deflector 7 for preventing the generation of a suction vortex is attached to the underwater motor 4. The baffle plate 7 covers the upper part of the deflecting length X from the underwater motor 4 to the front of the impeller 5 and the draft ring, and the deflecting width Y extending to the left and right sides of the underwater motor 4 along the deflecting length X. For example, the cross-sectional shape is formed in an inverted dish shape having inclined plate portions 7b on both left and right sides of the flat plate portion 7a.

The draft ring 6 is for sending the stored water W sucked by the impeller 5 forward as a powerful jet swirling flow, and is formed in a cylindrical shape at least equal to the width of the impeller 5. .

A base end of a cable (not shown) such as a wire or a chain is hooked to the bracket 8, and the distal end of the cable is raised or returned by a manual operation or a mechanical operation. Thus, the underwater motor 4, the impeller 5, the draft ring 6 and the deflector 7 can be moved up and down together with the bracket 8 in water. A power supply cable (not shown) is connected to the underwater motor 4.

Next, the operation of the above embodiment will be described. When the underwater motor 4 is started, the stored water W around the underwater motor 4 is sucked into the inside of the draft ring 6 by the impeller 5 and is pushed out as a strong jet swirling flow while being stirred.

At this time, the stored water W on the water surface located immediately above the impeller 5 bypasses to both sides of the impeller 5 along the deflector 7, and is directed toward the suction side of the impeller 5. Will follow.

Since the stored water W of the pond bottom B is simultaneously joined to this suction path, the flow rate of the stored water W sucked at the water surface decreases, and the flow velocity also decreases. Therefore, no suction vortex for sucking air on the water surface is generated at the water surface portion.

[0018]

The underwater stirrer of the present invention has a submersible motor having an impeller and a draft ring surrounding the impeller at the tip end thereof, which can be moved up and down in water by a guide member. Deflectors are installed to prevent the generation of suction vortices.The deflectors are provided on the left and right sides of the submersible motor along the length of the deflector from the underwater motor to the front of the impeller and the draft ring. Since it is formed in a size that can cover the upper part of the expanding divergence width, even when operating in a reservoir with a shallow water depth, the generation of suction vortex is prevented beforehand by the deflector plate, eliminating vibration due to air suction Therefore, the durability of the equipment is improved. In addition, since an operation stop due to a failure or the like is eliminated, there is an excellent advantage that the reliability of the equipment is significantly improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an installed state of an underwater stirrer.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underwater agitator 3 Guide member 4 Underwater motor 5 Impeller 6 Draft ring 7 Deflector X Deflection length Y Deflection width

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References: JP-A-63-160932 (JP, U) Jiko 36-22662 (JP, Y1) Jiko 32-15101 (JP, Y1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A submersible motor having an impeller and a draft ring surrounding the impeller at a tip end thereof is arranged so as to be able to ascend and descend underwater by a guide member, and prevents generation of a suction vortex in the underwater motor. The deflector is mounted above the deflecting length from the submersible motor to the front of the impeller and the draft ring, and the deflecting width extending to the left and right sides of the submersible motor along the deflecting length. An underwater stirrer formed in a size that can be covered.