JPS6343430Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a stirring blade and a partition wall of a submersible sand pump.

Submersible sand pumps are used by being submerged at the bottom of sandy or muddy soil and placed on the bottom of water. However, the weight of the submersible sand pump and the part of the sand and mud layer on which the submersible sand pump is supported.As the submersible sand pump sucks in the sand and mud, the submersible sand pump sinks into the sand and mud, which increases the bearing capacity of the submersible sand pump and the weight of the submersible sand pump. It stops moving when it is balanced. At this time, the area around the suction port is covered with sand, reducing the area of the suction passage through which the liquid is fed. In this state, the pump sucks in the sand and mud along with the liquid. Therefore, the efficiency of the pump decreases due to a decrease in the liquid passage area of the suction passage on the outside of the pump from the suction port, an increase in suction resistance, and the suction of sand and mud.

For this purpose, a stirring blade is provided with a shaft extending downward through a suction port fixed to the end of the pump shaft.
The area around the suction port is covered with a partition wall, and the stirring blades and the partition wall prevent sand and mud from being sucked in, and the cross section of the suction passage is ensured. However, in the conventional partition wall, the partition wall is arranged in a flat plate shape with a space between the partition wall and the pump suction cover, which is a flat plate, slightly above the stirring blade. There are many things that I try to do. When this conventional pump is operated, sand and mud are brought in between the partition wall and the suction cover, and the sand and mud are sucked in, significantly reducing pump performance.

The idea disclosed in Japanese Utility Model Publication No. 49-14201 is to provide an inverted cup-shaped sediment inversion chamber at the center of the lower surface of the above-mentioned flat partition wall, extend the pump shaft, and connect the pump shaft to the inverted cup-shaped sediment inversion chamber. A stirring blade is attached to the protruding end of the stirring blade at a distance from the bottom of the inversion chamber, and an earth and sand inflow hole is provided on the outer periphery of the upper part of the earth and sand inversion chamber above the stirring blade. By doing this, the above-mentioned problems are alleviated, but the soil and sand inflow holes become clogged with soil and stones, and the effect of the stirring blades is lost, resulting in only a loss of power.

This idea solves the problem of the submersible sand pump with a flat plate-shaped bulkhead mentioned above, and seeks the optimal shape and arrangement of the stirring blades and bulkhead to prevent the pump from sucking in sand and mud, and is also disclosed in the above publication. To provide a submersible sand pump which eliminates the problem of a sand and sand inlet being clogged with dirt and stones, which causes the stirring blades to become ineffective and only cause a loss of power, and which is free from blockage of dirt and stones and therefore causes no power loss. The purpose is to

This idea includes an impeller in the pump casing that constitutes a pump chamber with a suction port and a discharge port, and the suction port is arranged in the suction cover of the pump casing on the extension of the pump shaft, and the suction port is fixed to the end of the pump shaft. A pump is equipped with a stirring impeller with a blade at its tip inserted through the mouth at the extended position of the pump shaft, and the pump is supported so that the agitating impeller is spaced apart from the sandy mud bottom, and the outer circumference is approximately the same size as the pump casing. A cylindrical container-shaped bulkhead with a downward-facing opening is fixed to the pump casing side facing the suction cover with a gap between the walls and the bottom of the water, and a stirring blade is placed in the center of the end plate of the bulkhead. A center hole is provided for insertion, so that a stirring blade having a diameter smaller than the diameter of the partition wall can almost fit within the partition wall, so that the liquid flows from below the stirring blade toward the stirring blade and generates a downward swirling flow along the inside of the cylindrical part of the partition wall. This is a submersible sand pump.

Examples of this invention will be described below. 1st
The figure is a side view of the submersible sand pump of this invention. The submersible sand pump of this invention is equipped with an electric motor 1 at the top and a pump section 2 at the bottom like a normal submersible sand pump.The electric motor 1 has an upper cover 4 fixed to the motor frame 3, and the underwater cable 5 is sealed from the upper cover 4. and is guided to electric motor 1.

FIG. 2 is an enlarged vertical sectional view of the pump section of FIG. 1.

A casing cover 8 is fitted into the motor frame 3 via a sealing ring 6 and a packing 7, and bolts 9 are inserted through the bolt holes of the motor frame 3 and screwed into the casing cover 8 to be fixed. The pump casing 11 is fitted, and the bolts 12 are screwed into the pump casing 11 by passing through the bolt holes of the casing cover 8.

A pump shaft 13 coaxial with the electric motor 1 is sealed by a shaft sealing device 14 such as a mechanical seal installed between the motor frame 3 and the casing cover 8, and projects into the pump chamber 15. A key 16 is attached to the pump shaft 13. An impeller 17 is fitted through the impeller 17, and the impeller 17 is integrally formed with a liner ring 18 that fits into the casing cover 8 and an annular water seal portion 19 that fits into the casing cover 8 with a small gap, and is fitted into the inner periphery of the liner ring 18. The lip of the oil seal 21 is in contact with the outer periphery of the boss of the impeller 17.

A stirring blade 23 is attached to the threaded portion 22 at the end of the pump shaft 13.
The end female thread of the shaft portion 23a is screwed in,
The impeller 17 is fastened so as not to move in the axial direction of the pump shaft 13, and the stirring blade 23 is also fixed.

The pump casing 11 has a discharge port 24 communicating with the pump chamber 15, and a suction cover 26 is fitted through a sealing ring 27 so that the suction port 25 is on an extension of the pump shaft 13. A partition wall 31 in the shape of a cylindrical container with an opening 31a facing downward and having a shallow depth and an outer circumference approximately the same size as the pump casing is fixed to the pump casing side facing the suction cover 26 with an interval therebetween. It is placed at a distance from the bottom of the water. For this reason, a distance piece 32 is inserted between the partition wall 31 and the suction cover 26 so that the partition wall 31 is spaced apart from the suction cover 26.
1. The stand 33 is screwed into the pump casing 11 by passing through the bolt holes of the distance piece 32 and the suction cover 26. A flat disk-shaped base 34 with a round edge is in contact with the end of the stand 33,
Insert the bolt 3 through the bolt hole of the flat base 34.
5 is screwed into the stand 33.

The outer periphery between the partition wall 31 and the base 34 is open to the outside, and the stirring blade 23 has its shaft portion 23a.
The vicinity of the root next to is located near the axial position of the center hole 29 through which the stirring blade 34 provided on the end plate 31b of the partition wall 31 is inserted. Therefore, normally the stirring blade 23 is connected to the partition wall 31.
It's contained within. However, when the axial length of the partition wall 31 is short, the stirring blade 23 protrudes slightly below the partition wall 31. The diameter of the stirring blade 23 is much smaller than the diameter of the partition wall 31. This means that the liquid flowing from below the stirring blade 23 toward the stirring root 23 is transferred to the partition wall 3.
This is to generate a downward swirling flow along the inside of the cylindrical portion 31c.

A side view of the stirring blade 32 is shown in FIG. 3, a bottom view of FIG. 3 is shown in FIG. 4, and a perspective view of the stirring blade 23 is shown in FIG. The stirring blade 23 is provided with a blade plate 23-2 on a cylindrical boss 23-1 diagonally from both sides like a roof whose ridge is the diameter of the boss 23-1, and a blade with a rectangular cross section that spans this roof. A blade 23-3 is provided.

When the electric motor 1 is energized, the pump shaft 13 rotates, the impeller 17 rotates via the key 16, and at the same time the stirring blade 23 rotates. FIG. 6 is a diagram showing the state of water flow in this embodiment, and FIG. 7 is a plan view showing the water flow when the partition wall 31 of FIG. 6 is viewed from below. As shown in FIG. 6, due to the action of the stirring blades 23, the water flow containing sand and mud enters from the outer periphery between the partition wall 31 and the base 34 along the base 34 as shown by arrow A. Next, as shown by arrow B, the water flow is directed toward the stirring blade 23 from below the stirring blade 23, and the end plate 31b
Change direction at the bottom of the partition wall 3 and move outward.
Flows according to a vortex flow as shown by arrows Lo-1 and Arrow Lo-2 of downward swirling flow along the inside of the cylindrical portion 31c of No. 1,
Although it is extremely small, there is a flow as shown by arrow C due to the suction force of the impeller 17. At the outer peripheral edge of the partition wall 31, the flow that circulates again according to the vortex flow indicated by arrow R-2 and the partition wall 3
1, flows along the outer periphery of the partition wall 31, and separates into a flow indicated by arrow D, which flows from the outer periphery between the partition wall 31 and the suction cover 26 and is sucked into the pump along the partition wall 31. The pump itself sucks liquid that contains relatively little sand and mud from between the suction cover 26 and the partition wall 31 as shown by the arrow H by the action of the impeller 17, passes through the suction port 25, and is accelerated and pressurized by the impeller 17. It is discharged from the discharge port 24.

As shown in FIG. 7, the flow indicated by the arrow RO-1 also flows in a spiral shape centered on the axis of the stirring blade 23 on the plane.
Therefore, the vortex flows as indicated by the arrows RO, RO-1, and RO-2 in FIG. 6, while rotating along the vortex around the axis of the stirring blade 23.

The above are observations based on experiments. The flow indicated by arrow 2 contains relatively less sand and mud, and the liquid from the flows indicated by arrows 2 and 6, which contains relatively less sand and mud, is eventually sucked into the pump.

As described above, the submersible sand pump of this invention has an impeller in the pump casing that constitutes a pump chamber with a suction port and a discharge port, and the suction port is arranged in the suction cover of the pump casing on the extension of the pump shaft. A pump is equipped with an agitating blade fixed to the end of the pump shaft and having a suction port inserted through it and having a blade at the tip at an extended position of the pump shaft, and the pump is supported so that the agitating blade is spaced apart from the sandy mud bottom, A cylindrical container-shaped bulkhead with an outer circumference approximately the same size as the pump casing and an opening facing downward is fixed to the pump casing side at a distance from the suction cover, and is also arranged at a distance from the bottom of the water. A stirring blade having a diameter smaller than the diameter of the partition wall, with a center hole provided in the center of the end plate for the stirring blade to be inserted through, so that the liquid flows from below the stirring blade toward the stirring blade, producing a downward swirling flow along the inside of the cylindrical part of the partition wall. Because the submersible sand pump is arranged so that the water is almost contained within the bulkhead, the water flow is separated into a water flow containing a large amount of sand and mud and a water flow that is relatively free of sand and mud, and the pump sucks in less sand and mud, which improves pump efficiency. Good. If other conditions are equal, the wear inside the pump is proportional to the amount of sand and mud, so the durability of the pump can be ensured. In addition, the water flow generated by the stirring blades is directed from below the stirring blades toward the stirring blades, and the stirring blades are made smaller than the partition walls so as to generate a downward swirling flow along the inside of the cylindrical part of the partition wall, so there is no blockage between the stirring blades and the partition wall. I never do.

In the above explanation, the flat plate base 34 is necessary for supporting the pump, and includes the stirring blades 23 and the partition wall 3.
It has been found that the effect of No. 1 does not change even if the pump is installed by other means.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is an enlarged vertical sectional view of the lower part of Fig. 1, Fig. 3 is a side view of the stirring blade, Fig. 4 is a bottom view of Fig. 3, and Fig. 4 is a bottom view of Fig. 3. FIG. 5 is a perspective view of the stirring blade, FIG. 6 is a longitudinal sectional view showing the operation of this invention, and FIG. 7 is a plan view of FIG. 6. DESCRIPTION OF SYMBOLS 1...Electric motor, 2...Pump part, 3...Motor frame, 4...Top cover, 5...Underwater cable, 6...Sealing ring, 7...Putskin, 8...Casing cover, 11...Pump casing, 9,
12... Bolt, 13... Pump shaft, 14... Shaft sealing device, 15... Pump chamber, 16... Key, 17
... impeller, 18 ... liner ring, 19 ... water seal section, 21 ... oil seal, 22 ... thread section,
23... Stirring blade, 23a... Shaft portion, 23-1...
...boss, 23-2...blade plate surface, 23-3...blade blade, 24...discharge port, 25...suction port, 26...
... Suction cover, 27 ... Sealing ring, 29 ... Center hole, 31 ... Partition wall, 32 ... Distance piece, 33 ... Stand, 34 ... Base, 35 ...
…bolt.

Claims (1)

[Scope of utility model registration request] An impeller is provided in the pump casing that constitutes a pump chamber with a suction port and a discharge port, and the suction port is placed on the suction cover of the pump casing on the extension of the pump shaft, and is fixed to the end of the pump shaft and the suction port is inserted through it. The pump is equipped with a stirring blade with a blade at the tip at the extended position of the pump shaft, and the pump is supported so that the stirring blade is spaced apart from the sandy mud bottom. A cylindrical container-shaped bulkhead with a downward facing part is fixed to the pump casing side at a distance from the suction cover, and is arranged at a distance from the bottom of the water, and the center of the end plate of the bulkhead is the center of the insertion of the stirring blade. A hole is provided, and the stirring blade is arranged so that the stirring blade has a diameter smaller than the diameter of the partition wall, and is arranged so that the liquid flows from below the stirring blade toward the stirring blade, creating a downward swirling flow along the inside of the cylindrical part of the partition wall. Submersible sand pump.