JP2003038945A - Underwater mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air from being mixed up from the vicinity of the upper edge of a flow straightening plate 20 arranged in the upper part of a horizontal underwater mixer 16 without hindering the original water current generating function of the mixer 16 even when the mixer 16 is used at a low water level. SOLUTION: A baffle plate 21 inclined backward and directed downward is arranged in the rear end of the plate 20 of the mixer 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laterally arranged submersible mixer used for agitating stored water or the like stored in a water tank such as a sewage treatment plant or a water storage plant, and particularly for use at a low water level. Belongs to the technical field of water flow stabilization.

[0002]

2. Description of the Related Art Generally, an underwater mixer provided with a propeller for stirring stored water is known for the purpose of purifying stored water stored in, for example, a sewage treatment plant or a water storage plant.
As shown in FIG. 6, for example, this underwater mixer includes a closed cylindrical casing 17, and a motor (not shown) is housed inside the casing 17. On the front side of the casing 17, there is provided a propeller 18 which is attached to an output shaft (not shown) of the motor and is rotationally driven by the motor to generate a forward water flow.
Further, in order to effectively maintain the stirring energy up to a long distance, an annular guide plate 19 having a smaller diameter toward the front is arranged around the propeller 18 so as to be fixed to the outer circumference of the casing. It is used to stir the stored water by generating a swirling flow in the stored water by rotation.

By the way, when such a horizontally placed underwater mixer is used in a state close to the water surface of the stored water (for example, a low water level state), air from the water surface W is entrained in the suction flow A generated by the rotation of the propeller. As a result, due to the entrainment of air, a sufficient stirring effect of the stored water cannot be obtained, and in addition, vibrations due to the generation of vortices may cause a failure.

Therefore, such a suction flow is prevented,
In order to prevent the entrapment of air, conventionally, as shown in FIG. 7, the front side of the casing 17 is continuous with the upper side of the guide plate 19 on the upper side of the casing 17, and the rear side of the casing 17 is covered so as to cover the upper side of the casing 17. It has been proposed to provide a straightening vane 20 having a substantially arcuate cross section.

[0005]

However, in this proposal, since the straightening plate 20 is provided in the horizontally placed underwater mixer, the suction flow from the vicinity of the propeller 18 can be prevented, but when the water surface further approaches. A suction flow A is generated from the vicinity of the upper edge of the rear end of the straightening vane 20. Therefore, the entrainment of air when the horizontally placed submersible mixer is used at a low water level or the like cannot be overcome yet.

The present invention has been made in view of the above points, and an object of the present invention is to provide an original water flow of an underwater mixer even when the horizontally placed underwater mixer is used in a low water level state or the like. It is intended to prevent the entrainment of air from the vicinity of the upper edge of the current plate above the underwater mixer without impairing the generating function.

[0007]

In order to achieve the above-mentioned object, in the present invention, a member for changing the water flow is provided at the rear end of the straightening vane so that air is entrained from the vicinity of the upper edge of the straightening vane. I tried to prevent.

[0008] Specifically, in the invention of claim 1, a propeller for generating a water flow directed forward by rotation is provided on the front side of the casing, and an annular guide plate is arranged around the propeller, and the casing is provided. On the upper side of, the front end is continuous with the upper part of the guide plate, and as a horizontally arranged submersible mixer provided with a straight plate having a substantially arcuate cross section that extends to the rear part of the casing so as to cover the upper part of the casing, A baffle plate that is inclined downward toward the rear is provided at the end.

According to the above construction, at the rear end of the straightening plate,
By providing a baffle plate that slopes downward toward the rear, even when the water level is low, suction flow from near the upper edge of the rear end of the straightening vane is blocked, and from the rear of the casing to the front. The water stream can be smoothly divided vertically. Then, since the water flow divided upward flows above the straightening vane covering the upper part of the casing, it is possible to effectively prevent the entrainment of air from the vicinity of the upper edge portion of the straightening vane.

According to the second aspect of the invention, the rear end of the baffle plate is arranged to be close to the outer peripheral surface of the rear end of the casing.

According to the above construction, the gap between the outer peripheral surface of the casing rear end and the baffle plate can be minimized, the water flow entering these gaps can be reduced, and the upper edge portion of the current plate at the low water level can be reduced. It is possible to more effectively prevent the inclusion of air from the vicinity.

According to the third aspect of the invention, the guide plate has a smaller diameter toward the front.

According to the above structure, the water flow flowing in the guide plate has a higher flow velocity as it goes forward, so that the stirring energy with respect to the stored water can be maintained for a long distance.

According to the invention of claim 4, both lower end portions of the current plate are inclined downward toward the front.

According to the above structure, it is possible to widen the region where the stored water can be sucked in while keeping the range where the air can be prevented from being entrained from the side, and prevent the entrainment of air without hindering the stirring action. can do.

[0016]

FIG. 4 shows an embodiment of the present invention,
P is a water tank, and is composed of, for example, a sewage treatment plant, a reservoir for various factories, pond lake water, a trench, a fish farm, and the like. On the side wall P1 of the water tank P, the guide bar 1 is a bottom surface P that is located in the water tank P underwater.
It is erected so as to extend from near 2 to near the floor P3 around the water tank P which is located above the water surface W, and the upper end of the guide bar 1 is an upper bracket 8 as a support bracket.
And the lower end is rotatably supported by the lower base 12.

That is, the guide bar 1 is in the shape of a hollow rectangular tube, and supporting portions 2 and 3 are provided at the center portions in the width direction on the rear side surfaces of the upper and lower ends thereof, and these supporting portions 2 and 3 are provided.
Cylindrical upper and lower shaft portions 4 and 5 extending in parallel with the guide bar 1 and concentrically with each other are integrally fixed to the front end (rear end) of the.

The upper bracket 8 is located above the water surface W on the side wall P1 of the water tank P.
A plate-shaped mounting portion 9 mounted and fixed via B, ..., And a connecting portion (not shown) extending horizontally on the surface of the mounting portion 9.
And a cylindrical bearing portion 10 having a vertical axis, and the lower half portion of the bearing portion 10 projects below the connecting portion. The upper shaft portion 4 of the guide bar 1 is rotatably supported by the portion in an externally fitted state.

On the other hand, the lower base 12 is a plate-shaped mounting portion 13 mounted and fixed on the bottom surface P2, which is located underwater in the water tank P, via anchor bolts B, B ,. The upper bracket 8 is provided with a cylindrical bearing portion 14 that is disposed so as to be positioned immediately below the bearing portion 10 and protrudes, and that has a vertical axis line. The bearing portion 14 is provided with the guide bar 1 from above. The lower shaft portion 5 is rotatably fitted and supported.

When the water tank P is a pond lake water, a moat, or a fish farm, and the side wall P1 and the bottom surface P2 thereof are soil, for example, after the side wall P1 and the bottom surface P2 are hardened with concrete or the like,
The anchor bolts B, B, ... May be embedded.

With such a support structure of the guide bar 1, the guide bar 1 is supported by the upper and lower shaft portions 4 and 5 so as to be rotatable around the vertical axis, whereby the underwater mixer 16 to be described later is provided. The guide bar 1 can be swung in a horizontal plane to change its orientation in the horizontal plane.
Reference numeral 6 denotes a handle which is detachably provided on the upper end portion of the guide bar 1 and is integrally rotatable, and is for adjusting the direction of the underwater mixer 16.

A horizontally placed submersible mixer 16 according to an embodiment of the present invention is supported on the guide bar 1 so as to be vertically movable. FIG. 1 shows this underwater mixer 16.
The underwater mixer 16 includes a closed cylindrical casing 17,
A motor is housed inside the casing 17.
Further, on the front side of the casing 17, there is provided a propeller 18 which is attached to the output shaft of the motor and is rotationally driven by the motor to generate a forward water flow. Further, in order to effectively maintain the stirring energy up to a long distance, an annular guide plate 19 having a smaller diameter toward the front is provided around the propeller 18.

That is, as shown in FIG. 2, rod-shaped support members 19b, 19b, ... Are fixed to a ring-shaped support member 19a provided on the outer periphery of the casing 17, and guide plates are attached to these rod-shaped support members 19b, 19b ,. 19 are fastened with bolts and the like, and the guide plate 19 is supported concentrically with the casing 17. In order to maintain the stirring energy with respect to the stored water farther, as shown in FIG. 1, the portion of the guide plate 19 on the front side of the propeller 18 is not tapered but has a cylindrical shape with a constant diameter. Is desirable.

Further, on the upper side of the casing 17, the front end is continuous with the upper portion of the guide plate 19 and the casing 17 is provided.
A straightening plate 20 having a substantially arcuate cross section is provided so as to cover the upper part of the casing 17 and extend to the rear part of the casing 17. This straightening plate 2
In the case of 0, both lower end portions are inclined downward toward the front so that air is not trapped from the side.

Specifically, the current plate 20 is fastened and supported by rod-like support members 19b, 19b, ... Of the guide plate 19 by bolts or the like. Further, the rectifying plate 20 has a larger area covering the periphery of the casing 17 as it goes forward, and the front end is continuous with the guide plate 19.

Further, as a feature of the present invention, a baffle plate 21 which is inclined rearward and downward is provided at the rear end of the straightening vane 20 in order to smoothly divert the forward water flow vertically. Has been. The rear end of the baffle plate 21 is close to the outer peripheral surface of the rear end of the casing 17.

That is, the baffle plate 21 is
The rectifying plate 20 is formed to such an extent that the angle with respect to the water surface does not become too large so as not to hinder the water flow from the rear to the front.
It is inclined from the rear end toward the casing 17. The rear end of the baffle plate 21 extends to the vicinity of the outer peripheral surface of the casing 17.

Further, as shown in FIGS. 2 and 3, the center of the rear end portion of the baffle plate 21 is cut out for the purpose of preventing interference with the power cable 24 and the like which will be described later, so that the baffle plate 21 and the casing 17 are separated from each other. The gap is kept to a minimum.

Underwater mixer 16 having such characteristics
Is a U-shaped support portion 22 at the rear end of the casing 17.
Is fixedly provided, and the support portion 22 has a pair of support plates 22a, 22a extending rearward in a state of facing each other,
The guide bar 1 is sandwiched between the support plates 22a, 22a and fastened and fixed by bolts or the like.

Further, a port (not shown) for communicating the inside and outside of the casing 17 is integrally formed in the vicinity of the support portion 22 at the rear end of the casing 17, and the port is connected to the internal motor. A power cable 24 having an electric wire (not shown) for supplying electric power and an electric wire (not shown) for controlling the motor therein is connected. In order to prevent water from entering the inside of the casing 17, the communication port of this port is hermetically sealed.

A support plate 25 extending upward (upper side in FIG. 4) is fixed to the outer peripheral surface of the flow regulating plate 20. Through holes 25a, 2 of the support plate 25
The lower end of the chain 26 is connected to any one of the chains 5a, while the upper end of the chain 26 is held by the upper bracket 8 so that the underwater mixer 16 is supported in a suspended state.

Next, the operation of the horizontally placed submersible mixer 16 according to this embodiment will be described. Power is supplied to the motor via the power cable 24 provided along the chain 26, and the propeller 18 rotates, so that the propeller 18 is rotated.
A swirling flow is generated in the stored water by causing the water in the rear to flow forward. At this time, the guide plate 19 has a smaller diameter toward the front, and the flow rate of the water flow flowing in the guide plate increases toward the front, so that the stirring energy for the stored water can be continued to a far distance. The swirling flow stirs the stored water in the water tank P to promote purification.

When such a horizontally placed underwater mixer is used in a low water level state (a state where the depth from the water surface is shallow), as shown in FIG. 5, the water flow from the rear side to the front side of the casing 17 is increased. Is smoothly divided vertically by the baffle plate 21 that is inclined downward toward the rear of the casing 17, and the upwardly divided water flow (shown by C in FIG. 5) flows above the straightening plate 20. For this reason,
The suction flow from the vicinity of the upper edge of the flow straightening plate 20 can be blocked, and the air can be prevented from being trapped.

Further, since the rear end of the baffle plate 21 is close to the outer peripheral surface of the rear end of the casing 17, the outer peripheral surface of the rear end of the casing 17 and the baffle plate 2 are arranged.
1 can be minimized, the water flow entering these gaps can be reduced, and the entrainment of air from the vicinity of the upper edge of the current plate during low water level can be effectively prevented.

Further, the straightening vane 20 has a shape in which both lower end portions are inclined downward toward the front so as to widen the region where the stored water can be sucked in while keeping the range in which the entrainment of air from the side can be prevented. Therefore, the stored water can be effectively sucked and stirred from below without causing air to be entrained from above.

In the above embodiment, the baffle plate 21 is arranged so that the rear end thereof is close to the outer peripheral surface of the casing 17, but it is not always necessary to extend the baffle plate 21 to the outer peripheral surface. However, in order to effectively prevent the entrainment of air, it is desirable that the baffle plate 21 be close to the outer peripheral surface.

Further, in the above-mentioned embodiment, the guide plate 19 has a shape in which the diameter decreases toward the front, but it is not always necessary to reduce the diameter toward the front. For example, the guide plate 1
The diameters of 9 and the current plate 20 may be uniform throughout. However, in order to maintain the stirring energy with respect to the stored water for a long distance, it is desirable that the vicinity of the propeller 18 has a small diameter toward the front.

Further, in the above embodiment, the current plate 20 is
Although both lower end portions are inclined downward toward the front, they do not necessarily have to be inclined downward toward the front and may be horizontal. However, in order to prevent the entrainment of air without hindering the stirring action, it is desirable to incline downward toward the front.

[0039]

As described above, according to the first aspect of the invention, in the horizontally arranged submersible mixer, the baffle plate which is inclined rearward and downward is provided at the rear end of the current plate. Therefore, even when the water level is low, the suction flow from the vicinity of the upper edge of the rear end of the straightening vane is blocked, and the water flow divided upward flows over the straightening vane that covers the upper part of the casing. It is possible to effectively prevent the entrainment of air from the vicinity of the upper edge portion.

According to the second aspect of the invention, since the rear end of the baffle plate is located close to the outer peripheral surface of the rear end of the casing,
By reducing the water flow entering the gap between the outer peripheral surface of the casing rear end and the baffle plate, it is possible to more effectively prevent air from being entrained from the vicinity of the upper edge portion of the current plate at a low water level.

According to the third aspect of the invention, since the guide plate has a diameter that decreases toward the front, the stirring energy with respect to the stored water can be maintained for a long distance.

According to the fourth aspect of the invention, since both lower ends of the straightening vane are inclined downward toward the front, it is possible to prevent the entrainment of air without hindering the stirring action.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of an underwater mixer according to an embodiment of the present invention.

FIG. 2 is a side view of a guide plate, a current plate, and a baffle plate as viewed from the rear.

FIG. 3 is a plan view of a guide plate, a current plate, and a baffle plate viewed from above.

FIG. 4 is a perspective view showing an underwater mixer installed in a water tank.

FIG. 5 is a diagram showing a water flow in the vicinity of a baffle plate.

FIG. 6 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 7 is a view corresponding to FIG. 1 showing another conventional example.

[Explanation of symbols]

16 underwater mixer 17 casing 18 propellers 19 Information board 20 Current plate 21 baffle plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiyuki Horie             14 Sakudai, Ono City, Hyogo Prefecture Shinmeiwa Industry Co., Ltd.             Industrial Machinery Systems Division (72) Inventor Takehisa Watanabe             14 Sakudai, Ono City, Hyogo Prefecture Shinmeiwa Industry Co., Ltd.             Industrial Machinery Systems Division F-term (reference) 4G078 AA13 AB20 BA01 DA19 EA20

Claims (4)

[Claims] 1. A front side of the casing has a propeller for generating a water flow directed forward by rotation, an annular guide plate is disposed around the propeller, and a front end of the guide plate is provided above the casing. A laterally arranged underwater mixer provided with a straightening plate having a substantially arcuate cross section which is continuous to the upper part and extends to the rear part of the casing so as to cover the upper part of the casing. An underwater mixer characterized in that a baffle plate that is inclined so as to face is provided. 2. The underwater mixer according to claim 1, wherein the rear end of the baffle plate is close to the outer peripheral surface of the rear end of the casing. 3. The underwater mixer according to claim 1 or 2, wherein the guide plate has a smaller diameter toward the front. 4. The underwater mixer according to any one of claims 1 to 3, wherein both lower end portions of the current plate are inclined downward toward the front.