JP3939618B2 - Low water level underwater mixer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a low water level driven under a low water level suitable for use in sludge prevention, destruction of floating scum, prevention of stagnation of ponds and lake water, drainage equipment in the food industry, etc. It relates to a mixer.
[0002]
[Prior art]
Conventionally, as an underwater mixer for stirring, as shown in FIGS. 6 and 7, a propeller 2 is provided at one end of an underwater motor 1 so as to be rotatable about a horizontal axis, and a jet generated by the rotation of the propeller 2 is used. A guide ring 3 that surrounds the outer periphery of the propeller 2 and guides the jet flow is attached and fixed to the motor housing 1a of the submersible motor 1 via a support bracket 4 and the like in order to prevent dispersion outside the diameter.
[0003]
The other end of the submersible motor 1 is provided with a slide bracket 7 that is slidably fitted along an elevating guide column 6 made up of an upright square pipe or the like.
[0004]
Further, in the low water level submersible mixer 1 used at a low water level, as shown in FIGS. 6 to 8, the upper portion of the guide ring 3 and the motor are used for the purpose of preventing air inhalation when a jet is generated by the rotation of the propeller 2. The upper part of the housing 1a is covered and a current plate 9 is provided.
[0005]
The rectifying plate 9 is composed of an upper top plate portion 9a and side plate portions 9b extending downward from the both sides of the top plate portion 9a and extending downward, and is configured to surround the upper portion of the guide ring 3 and the upper portion of the motor housing 1a. Has been.
[0006]
The rectifying plate 9 is detachably mounted and fixed by fastening bolts 11 to both sides of the mounting seat 1b provided on the upper portion of the motor housing 1a and the mounting stay 10 provided on the support bracket 4, respectively. Has been.
[0007]
In the figure, 12 is a coupling tool for suspending chain connection, arrow P indicates the water flow when the propeller 2 rotates, and the size of arrow P represents the outline of the flow rate.
[0008]
In addition, there is a structure in which the guide ring 3 is integrally provided with the rectifying plate 9 that prevents such air suction. For example, as disclosed in JP 2000-237564 A and JP 2000-240599 A.
[0009]
[Problems to be solved by the invention]
However, according to the low water level submerged mixer provided with the rectifying plate 9 detachably, the cross section of the rectifying plate 9 covers the guide ring 3 and extends over the motor housing 1a along the axial direction of the propeller 2. When the propeller 2 rotates, a substantially equal flow rate is sucked and guided into the guide ring 3 from the periphery of the motor housing 1a.
[0010]
Accordingly, the flow rate of the water flowing through the gap between the upper surface side of the motor housing 1a and the rectifying plate 9 is relatively large. In order to effectively prevent the suction of air, the rectifying plate 9 is disposed on the upstream side in the water flow direction. It was necessary to make the structure extended long, and the enlargement of the baffle plate 9 was invited.
[0011]
Further, due to the increase in size of the rectifying plate 9, strength for supporting the mounting is also required, and in this conventional structure, there is a drawback in that the structure is complicated and the structure is complicated. It was.
[0012]
Furthermore, according to the low water level underwater mixer having a structure integrally provided with a so-called rectifying plate in which the guide ring is extended to the rear part of the submersible motor as disclosed in the above-mentioned conventional publication, the structure of the guide ring itself is complicated. At the same time, there is a drawback that the guide ring itself is increased in size.
[0013]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a low-water level underwater mixer that simplifies the structure by reducing the size of the rectifying plate and improves the air suction prevention performance.
[0014]
[Means for Solving the Problems]
The technical means for achieving the above object includes a propeller that is rotatable around a horizontal axis at one end of a submersible motor, and a guide ring that surrounds the outer periphery of the propeller. A rectifying plate is provided to cover the upper portion of the housing, and the rectifying plate is composed of an upper top plate portion and side plate portions that are gradually spaced apart from both sides of the top plate portion and extend downward. In the low water level submerged mixer jetted from the motor housing through the guide ring, the upstream side in the liquid flow direction of the top plate portion of the rectifying plate is formed narrow and the downstream side is formed wide.
[0015]
Moreover, it is good also as a structure where the said current plate downstream end part in the liquid flow direction and the liquid flow direction upstream end part in the said guide ring were overlapped, and the current plate was attached and fixed.
[0016]
Further, the rectifying plate may be attached and fixed to the motor housing by a single bolt body.
[0017]
In addition, a guide tube through which the bolt body is inserted is provided in the rectifying plate, and a lower slope of the flat plate portion projecting on both sides and a downwardly inclined shape extending from both side edges in the width direction of the flat plate portion at the lower end of the guide tube A spring plate comprising an inclined plate portion extending to the plate, and the length of the flat plate portion in the width direction is shorter than the lateral width of the mounting seat of the motor housing to which the bolt body is screwed and fastened. The length in the width direction of the entire plate may be longer than the lateral width of the mounting seat, and the rectifying plate may be mounted and fixed through elastic deformation of the spring plate by screwing the bolt body to the mounting seat.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3, the low water level submersible mixer 20 is rotated at one end of a submersible motor 21 around a horizontal axis as described above. And a guide ring 23 that surrounds the outer periphery of the propeller 22 and guides the jet in order to prevent the jet generated by the rotation of the propeller 22 from being dispersed radially outward. The motor 21 is fixedly attached to the motor housing 21a.
[0019]
Further, the other end of the submersible motor 21 is provided with a slide bracket 27 that is slidably fitted along the lifting guide column 26, and covers the upper part of the guide ring 23 and the upper part of the motor housing 21a so as to cover the current plate 29. The structure is equipped with.
[0020]
The rectifying plate 29 is also composed of an upper top plate portion 29a and a pair of side plate portions 29b extending downwardly from the both sides of the top plate portion 29a and extending downward, particularly in the present embodiment. The plate portion 29a is formed in a trapezoidal shape in plan view in which the lateral width on the upstream side in the liquid flow direction located on the upper side of the motor housing 21a is narrow and the lateral width on the downstream side in the liquid flow direction located on the upper side of the guide ring 23 is formed wide. It is said that the structure. At this time, the lateral width of the wide side top plate portion 29a located on the upper side of the guide ring 23 is configured substantially the same as the lateral width of the conventional top plate portion 9a.
[0021]
The rectifying plate 29 is configured such that the downstream end portion in the liquid flow direction and the upstream end portion in the liquid flow direction in the guide ring 23 are overlapped, and the motor housing 21a is screwed and fastened with a fastening bolt 31 as a bolt body. It is fixedly attached to a mounting seat 21b provided on the top of the. The mounting seat 21b has a structure provided at one end of a ridge extending along the axial direction on the upper surface of the motor housing 21a.
[0022]
Corresponding to the fastening bolt 31 insertion position of the top plate portion 29a in the rectifying plate 29, as shown in FIGS. 4 and 5, a guide cylinder 32 of an appropriate length through which the fastening bolt 31 is inserted is welded or the like. The rectifying plate 29 is provided, and at the lower end of the guide tube 32, a flat plate portion 33a protruding on both sides and an inclined plate portion 33b extending in a descending inclined shape gradually expanding from both side edges in the width direction of the flat plate portion 33a. The width of the flat plate portion 33a in the width direction is shorter than the lateral width of the mounting seat 21b of the motor housing 21a to which the fastening bolt 31 is screwed and fastened. Is longer than the lateral width of the mounting seat 21b.
[0023]
In the state where the fastening bolt 31 is screwed and fastened to the mounting seat 21b, as shown in FIG. 5, the rectifying plate 29 is attached and fixed while the spring plate 33 is elastically deformed.
[0024]
In this mounted and fixed state, the guide cylinder 32 has a spacer function for ensuring a proper gap between the peripheral surface of the motor housing 21a and the inner surface of the rectifying plate 29.
[0025]
In addition, in the figure, 34 is a coupling tool for suspending chain connection, arrow P shows the water flow at the time of propeller 22 rotation like the above-mentioned, and the magnitude | size of the arrow P represents the outline of the flow volume.
[0026]
The present embodiment is configured as described above, and the upstream side in the liquid flow direction of the top plate portion 29a of the rectifying plate 29 is formed narrower than the top plate portion 9a of the conventional structure. The flow path at the upper end on the upstream side in the liquid flow direction becomes narrower, the flow rate when the propeller 22 rotates is reduced, air can be effectively prevented from being sucked in here, the air sucking prevention performance is improved, and the reliability is improved. I can plan. At this time, since the flow rate near the rectifying plate 29 decreases, the lower flow rate separated from the rectifying plate 29 increases accordingly.
[0027]
Moreover, since the air suction prevention performance can be improved by adopting a structure in which the upstream side in the liquid flow direction of the top plate portion 29a in the rectifying plate 29 is formed narrow, the size of the rectifying plate 29 can be effectively reduced. Therefore, the current plate 29 can be reduced in weight and easy to handle, and the current plate 29 can be easily attached by the single fastening bolt 31, and the mounting stay 10 as in the conventional structure is not required, and the mounting structure is simplified. There is also an advantage that can be achieved.
[0028]
Further, the downstream end portion in the liquid flow direction of the rectifying plate 29 and the upstream end portion in the liquid flow direction of the guide ring 23 are overlapped, and the rectifying plate 29 is attached and fixed. From this point, the current plate 29 can be effectively downsized.
[0029]
Further, in the mounting structure of the rectifying plate 29, the spring plate 33 provided at the lower end of the guide tube 32 is configured to be attached to the mounting seat 21b through elastic deformation, so that the mounting state of the rectifying plate 29 is The rectifying plate 29 is supported by the mounting seat 21b at the three positions of the lower surface of the flat plate portion 33a and the two inclined plate portions 33b, and the contact portion between the both inclined plate portions 33b and the mounting seat 21b is the rectifying plate 29. The fastening bolt 31 exhibits an anti-rotation function around the axis, and even if it is a fixed structure with a single fastening bolt 31, inadvertent loosening of the fastening bolt 31 due to vibration or the like can be effectively prevented. Reliability can be improved.
[0030]
In the above-described embodiment, the top plate portion 29a of the rectifying plate 29 is configured to extend over the motor housing 21a along the axial direction of the propeller 22, but the length of the guide tube 32 in the axial direction is further increased. The length of the rectifying plate 29 may be extended in a downwardly inclined shape in which the distance between the peripheral surface of the motor housing 21a and the inner surface of the rectifying plate 29 becomes narrower.
[0031]
In this case, the flow path between the motor housing 21a and the upper end on the upstream side in the liquid flow direction of the rectifying plate 29 becomes narrower, the flow rate during rotation of the propeller 22 is further reduced, and the depth from the water surface becomes deeper. Here, air can be more reliably prevented from being sucked in, the air sucking-in preventing performance is more reliable, and the reliability is further improved.
[0032]
Moreover, in the said embodiment, although the structure which attaches and fixes the baffle plate 29 with the single fastening bolt 31 is shown, another attachment structure may be sufficient.
[0033]
【The invention's effect】
As described above, according to the low water level submerged mixer of the present invention, the upstream side in the liquid flow direction of the top plate portion of the rectifying plate is narrowly formed and the downstream side is widely formed. In addition to simplifying the structure, the flow path on the upstream side in the liquid flow direction of the rectifying plate that easily sucks air becomes narrower and the flow rate decreases, so that air suction prevention performance can be improved and the product is reliable. There is an advantage that improvement can be achieved.
[0034]
Moreover, the size of the rectifying plate is also required by adopting a structure in which the downstream end portion in the liquid flow direction of the rectifying plate and the upstream end portion in the liquid flow direction of the guide ring are overlapped so that the rectifying plate is attached and fixed. In this respect, there is an advantage that the current plate can be effectively downsized.
[0035]
Furthermore, if the rectifying plate has a structure in which the rectifying plate is fixedly attached to the motor housing by a single bolt body, there is an advantage that the rectifying plate can be easily fixed and fixed, and the mounting structure can be simplified.
[0036]
In addition, a guide cylinder through which the bolt body is inserted is provided in the current plate, and the lower end of the guide cylinder extends in a downwardly inclined shape so as to expand from both side edges in the width direction of the flat plate portion and the flat plate portion. Provided with an inclined plate portion, the length in the width direction of the flat plate portion is shorter than the lateral width of the mounting seat of the motor housing to which the bolt body is screwed and fastened, and the width direction of the entire spring plate If the structure is such that the length of the mounting plate is longer than the width of the mounting seat, and the rectifying plate is mounted and fixed via elastic deformation of the spring plate by screwing and fastening the bolt body to the mounting seat, then a single bolt body Even with the fixing structure, inadvertent loosening of the bolt body can be effectively prevented, and there is an advantage that the reliability of the product can be improved from this point.
[Brief description of the drawings]
FIG. 1 is an overall schematic side view according to an embodiment of the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a schematic perspective view of the current plate.
FIG. 4 is an explanatory diagram of a portion for mounting and fixing a current plate.
FIG. 5 is an explanatory diagram of a portion for mounting and fixing a current plate.
FIG. 6 is an overall schematic side view showing a conventional example.
FIG. 7 is a plan view of the same.
FIG. 8 is a schematic perspective view of the current plate.
[Explanation of symbols]
20 Low water level underwater mixer 21 Submersible motor 21a Motor housing 21b Mounting seat 22 Propeller 23 Guide ring 29 Current plate 29a Top plate portion 29b Side plate portion 31 Fastening bolt 32 Guide tube 33 Spring plate 33a Flat plate portion 33b Inclined plate portion

Claims (4)

A propeller that is rotatable around the horizontal axis is provided at one end of the submersible motor, a guide ring is provided around the outer periphery of the propeller, a rectifying plate is provided to cover the upper part of the guide ring and the upper part of the motor housing, The baffle plate is composed of an upper top plate portion and a side plate portion extending downwardly from the both sides of the top plate portion, and the liquid is jetted from the motor housing side through the guide ring by the rotation of the propeller. In a low water level submersible mixer,
A low water level submerged mixer, wherein an upstream side in the liquid flow direction of the top plate portion of the current plate is narrowly formed and a wide downstream side is formed. 2. The rectifying plate is attached and fixed so that the downstream end portion in the liquid flow direction of the rectifying plate overlaps with the upstream end portion in the liquid flow direction of the guide ring. Low water level underwater mixer. The low-water level submersible mixer according to claim 1 or 2, wherein the current plate is attached and fixed to the motor housing by a single bolt body. The rectifying plate is provided with a guide tube through which the bolt body is inserted, and extends at a lower end of the guide tube in a downwardly inclined shape that expands from both side edges of the flat plate portion and the width direction of the flat plate portion. A spring plate comprising an inclined plate portion provided, and the length in the width direction of the flat plate portion is shorter than the lateral width of the mounting seat of the motor housing to which the bolt body is screwed and fastened, and the entire spring plate The length in the width direction is longer than the lateral width of the mounting seat, and the rectifying plate is mounted and fixed through elastic deformation of the spring plate by screwing and fastening the bolt body to the mounting seat. 4. A low water level submersible mixer according to 3.

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