JP5084664B2 - Horizontal submersible electric mixer - Google Patents

Description

  The present invention relates to a horizontal submersible electric mixer used for stirring, mixing and convection of treated water such as a sewage treatment tank and a reservoir.

In a conventional horizontal submerged stirrer, the outer periphery of a propeller-shaped impeller fitted to the shaft outlet end of a horizontal submersible motor is surrounded by a draft ring, and from the upper part of the draft ring to the rear end of the submersible motor. It is configured to prevent the suction of air from the water surface by shielding the suction vortex during low water level operation by horizontally extending a shielding baffle with a predetermined width in the shape of a cape to cover the upper part of the submersible motor. A liftable underwater stirrer (see, for example, Patent Document 1) is known.
Japanese Utility Model Publication No. 4-102630 (Fig. 1-2)

  However, in the up-and-down horizontal submerged stirrer of Patent Document 1, in order to prevent air suction from the side and the rear of the shielding baffle, it is wide and axially covering the upper part of the submersible motor. A large boulder-shaped shielding baffle with a long surface area must be separately stretched horizontally, and in the case of a propeller-shaped impeller with a large amount of water to be transferred, of course, the above-mentioned large-surface area boulder-shaped shielding baffle Since a large force acts on the baffle plate, the baffle plate must be formed of a thick plate material having a high rigidity to secure a strong rigidity. Inevitably, the weight of the underwater stirrer is heavy and the size of the agitator is increased, which increases the cost and the handling workability of the equipment. Furthermore, when the submerged stirrer is lowered and installed in the tank by the lifting mechanism for maintenance, etc., an air pocket is generated inside the horizontal stagnation-shaped baffle plate, and the air in the air pool is sucked in at the start-up. Therefore, there is a risk that abnormal vibrations due to large load fluctuations, cavitation, etc. may occur, causing damage to the impeller, shaft, baffle plate and draft ring, and accidents such as abnormal wear. Furthermore, since the sides and the lower side of the motor are in an open state, the flow velocity on the water contact surface of the motor is not increased, so that it is difficult to obtain a good motor cooling action.

  The present invention solves the above-mentioned problems, and does not entrain air even when the water level is low, and guides even if the horizontal submersible electric mixer is lowered into the stirring tank by a lifting mechanism for maintenance or the like. There is no air trapping in the ring, sufficient jet stirring effect is obtained, vibration is not generated, there is no risk of damage to the propeller, shaft, guide ring, etc. and abnormal wear, etc., and water absorption An object of the present invention is to provide a horizontal submersible electric mixer excellent in the cooling effect of a small and light motor that is sufficient for securing the amount, inexpensive, and easy to handle.

In the present invention, a propeller is fitted to the shaft outlet end of the horizontal submersible motor, the front end is a circular water outlet, and the upper edge opening end of the rear end suction port is directed to the suction side from the back of the propeller to the farthest position. the cylindrical guide ring inclined attached to a descending slope surrounds the outer periphery of the propeller, the rear end of the guide ring only upper portion is cast guide to near the rear portion of the horizontal submersible motor, the lower edge of the horizontal submersible motor Long hole suction that extends from the lower part of the front end of the horizontal submersible motor to the rear part by forming a lower inclined edge by cutting from the lower part of the front end obliquely upward and backward to form a lower inclined edge. The most important feature is the opening of the mouth.

  According to the horizontal submersible electric mixer according to the present invention, the front end is a circular spout, and only the upper edge of the rear end is inclined downward toward the suction side that is led to substantially the rear part of the horizontal submersible motor. The opening end of the upper edge suction port of the lower inclined position from the opening end of the upper edge spouting port is cut by a cylindrical guide ring which is cut from the lower part of the front end to the rear of the upper oblique direction to form the lower inclined edge. By configuring the farthest position from the back side of the propeller, even when the inside of the agitation tank is in a low water level state, air is not entrained, and it is formed in the shape of a long hole in the lower inclined edge of the low pressure part on the back side of the propeller The horizontal submersible electric mixer is agitated by a lifting mechanism for maintenance, etc., by a cylindrical guide ring inclined upward toward the discharge port without depositing, because suction is performed from below the mouth edge. Set down in the tank There is no air pool in the guide ring, sufficient jet stirring effect is obtained and vibration is not generated, and there is no possibility of causing accidents such as damage to the propeller, shaft and guide ring and abnormal wear, In addition, it is possible to secure the amount of water absorption, and since the guide ring is formed in a cylindrical shape, it is possible to obtain sufficient rigidity even with a thin plate material, so that there is an advantage that it is small and lightweight and easy to handle. .

  Further, since the motor is enclosed in a cylindrical guide ring, an annular gap between the inner periphery of the guide ring and the outer periphery of the underwater motor forms a water absorption path, and the flow velocity on the wetted surface of the outer periphery of the underwater motor increases. Therefore, it has an effect of being excellent in cooling effect.

  An embodiment of a horizontal submersible electric mixer according to the present invention will be described in detail with reference to FIGS. 1 to 3 of the accompanying drawings based on examples.

1 to 3, 1 is a horizontal submersible motor, 2 is a propeller fitted to the shaft outlet end of the horizontal submersible motor 1, and 3 is a top end of the suction port 4 </ b> B with a circular outlet spout 4 </ b> A. the edge open end a cylindrical guide ring inclined attached to a descending slope towards the suction side farthest position from the rear propeller 2, forced fixing to the outside of the horizontal submersible motor 1 by stays or the like, in front of the cylindrical Is surrounded by the outer periphery of the propeller 2, and only the upper edge of the rear end is extended to the substantially rear part of the horizontal submersible motor 1, and the lower edge is obliquely upward and rearward from the vicinity of the lower part of the front end of the horizontal submersible motor 1. By cutting away and forming the downward inclined edge 5, the long hole-shaped suction inlet 4B which makes this inclined edge 5 an opening edge is opened. The suction port 4B is formed in a vertically long elliptical shape that extends from the vicinity of the lower part of the front end of the horizontal submersible motor 1 to the substantially rear part. 5A is an elevating guide rail for moving the horizontal submersible electric mixer up and down, 5B is an elevating guide arm, 6 is a hanging metal fitting for hanging the hanging chain, and 7 is an attachment hole for the hanging metal fitting 6.

  And if the propeller 2 rotates by driving the horizontal submersible motor 1 in the stirring tank, the water in the tank is sucked into the guide ring 3 from the suction port 4B, and the flow velocity on the liquid contact surface of the horizontal submersible motor 1 is increased. At the same time, it moves forward with a cooling action and is ejected as a stirring flow from the water outlet 4A. The suction port 4B is formed in the shape of a long hole with the inclined edge 5 as the rim, and the suction effective diameter is substantially increased, so that a sufficient suction amount is obtained, and the lower portion of the suction port 4B is the horizontal submersible motor 1 The front end of the propeller 2 is opened and suction is performed from below the low-pressure part on the back side of the propeller 2, so that no sediment is deposited. On the other hand, the upper part of the back side low-pressure part of the propeller 2 is shielded by a cylindrical guide ring 3 that extends backward and is inclined downward, so that it does not approach the water surface directly even at low water levels. In addition, the cylindrical guide ring 3 that is inclined upward toward the discharge port 4 </ b> A causes air to remain in the guide ring 3 even when the horizontal submersible electric mixer is lowered into the stirring tank for maintenance or the like. There is also no risk of occurrence.

It is a side view of the horizontal submersible electric mixer concerning the present invention. It is a rear view of the guide ring in the horizontal submersible electric mixer of the present invention. It is a bottom view of a guide ring in the horizontal submersible electric mixer of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal submersible motor 2 Propeller 3 Guide ring 4A Circular water outlet 4B Long hole suction port 5 Downward inclined edge

Claims (1)

A propeller is fitted to the shaft lead-out end of the horizontal submersible motor, the front end is a circular water outlet, and the upper edge opening end of the rear end suction port is inclined farther down from the back of the propeller toward the suction side in a downward slope. The attached cylindrical guide ring is surrounded by the outer periphery of the propeller, and only the upper edge of the rear end of the guide ring is extended almost to the rear of the horizontal submersible motor, and the lower edge is near the lower part of the front end of the horizontal submersible motor. The slanted edge is cut from the top to the rear to form a slanted lower edge, with the slanted edge as the lip that opens a long hole-like suction port that extends from the lower part of the front end of the horizontal submersible motor to the rear part. A horizontal submersible electric mixer.

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