JPS622312Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to the configuration of a submersible pump equipped with a foreign matter removal device that reliably removes foreign matter such as sand and prevents clogging. .

``Prior Art'' In general, as domestic deep well submersible pumps, vortex pumps (friction pumps) are widely used, which can provide several stages of lift with a single impeller compared to a volute pump.

When a vortex pump is used in a borehole as a submersible pump, the outer diameter of the pump is limited and the gap between the pump casing and impeller is very narrow due to its structure, so sand etc. may flow into the pump. The impeller was clogged with sand and the like, causing sand entrainment, which not only reduced pump performance but also caused excessive current to flow through the motor, eventually causing the motor to burn out.

For this reason, submersible pumps are usually equipped with a strainer and a sand remover to prevent foreign matter such as sand from being sucked in.

However, since conventional sand removers are attached to the outer cylinder of the pump casing, if the holes in the strainer are made extremely small, they will become clogged in a short period of time, making them almost impractical. .

For this reason, it is difficult to prevent the inflow of sand, etc., and there are problems in that use is limited to wells that are free of foreign substances such as sand, and repairs are often required due to sand engraving accidents.

That is, the structure of a conventional submersible pump will be explained with reference to FIG. 4. FIG. 4 is a longitudinal sectional view of the main part of the conventional submersible pump, and a pump body 15 is provided on the upper part of a motor 14. The pump body 15 is composed of a vortex pump.

The pump body 15 includes impellers 16 and 17.
The well water is constructed in two stages, and the well water is sucked in from the impeller 16 on the lower stage and discharged from the impeller 17 on the upper stage.

Furthermore, a suction port 18 is formed on the outer periphery of the pump body 15, and a discharge port 19 is formed in the upper part.

The suction port 18 is equipped with a strainer 20, and the discharge port 19 is configured to be connected to a water pump (not shown).

In such a configuration, when the pump body 15 is operated, water is sucked from the suction port 18. At this time, if there are foreign substances such as sand mixed in the well water, the foreign substances can be removed by the strainer 20. 20
will accumulate on the outer peripheral surface of the

Therefore, the strainer 20 gradually becomes clogged, and eventually comes to exhibit a large resistance to water flow at the suction port 18, which affects water pumping.

Such submersible pumps cannot be used in wells where foreign substances such as sand are mixed, and the problem is that the strainer 20 must be cleaned frequently or the strainer 20 must be prepared for failure. was.

``Problems that the invention attempts to solve'' In light of these circumstances, the purpose of this invention is to provide a submersible pump that can be used safely even in wells containing foreign substances such as sand. There is.

``Means for solving the problem'' This invention provides a suction port on the top surface of the pump casing, a discharge port is attached to this suction port, and this discharge port is extended in the axial direction to form an extended discharge channel. A flange is provided at the upper end of the extended discharge waterway, and a foreign matter removing device for removing sand formed of a net is provided on the outer periphery between the flange and the pump casing with the suction port inside. It solves the problem.

``Function'' By forming an extended discharge channel in the upper part of the pump body and forming a flange at the upper end, it is possible to form a foreign matter removal device with an extremely large net between the pump casing and the flange. , even if the well contains foreign substances such as sand, it will not easily become clogged.

Since a sufficient area can be secured even if the mesh that forms the foreign matter removal device is made fine, there is no possibility of clogging caused by foreign matter in a short period of time, and by forming a long extended discharge channel, foreign matter can be removed at will. Since the removal device can be made larger and its lifespan can be extended, an innovative submersible pump that does not clog can be constructed.

"Embodiment" The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a vertical cross-sectional view of a main part of a submersible pump according to an embodiment of the present invention, and FIG.
FIG. 3 is a longitudinal sectional view showing the main parts thereof, and FIG. 3 is a perspective view for making the structure easier to understand.

In FIGS. 1 to 3, the submersible pump indicated by the symbol P in the figures has a pump body 2 attached to the upper part of the motor part 1.
A suction port 4 is formed in the upper surface of the pump casing 3.

It is configured to suck well water from the suction port 4.

Furthermore, an impeller 6 is attached to the shaft 5 of the pump body 2.
a, 6b are fixed, and the shaft 5 is integral with the motor part 1.

The upper part of the pump casing 3 is an extended discharge waterway 7.
is formed, and the extended discharge channel 7 is formed in a cylindrical shape, and the hollow part inside is formed as the discharge channel 8.
, and a discharge port 9 is formed at the upper end.

Further, the length of the extended discharge waterway 7 is approximately 1 to 2 times the outer diameter of the pump casing 3.

Further, a collar 10 is formed at the upper end of the extended discharge waterway 7, and a sand removing foreign matter removal device surrounds the extended discharge waterway 7 between the outer periphery of the collar 10 and the outer cylindrical portion of the pump casing 3. It is stretched like this.

This foreign matter removing device for removing sand is formed by a strainer 11 made of a fine wire mesh of 60 meshes or more.

In order to tension the strainer 11, the upper and lower parts are fixed with screws 12, and the strainer 11 is constructed so as not to come off due to water pressure from the outside.

The extended discharge waterway 7 is equipped with a ball-shaped check valve 13 to prevent pumped water from flowing backward.

The submersible pump P constructed in this way is suspended in a well casing so that it remains fully submerged even during pumping, and when the motor 1 is driven, the well water is
It is sucked in from the suction port 4 through the mesh of the strainer 11.

If foreign matter such as sand is present, it will be trapped in the mesh of the strainer 11 and will not flow into the pump casing 3.

Furthermore, the well water sucked in from the suction port 4 is made highly pressurized by the impellers 6a and 6b, and flows to the discharge port 9 via the discharge path 8.

When the well water flows in this manner, if foreign matter such as sand is mixed in the well water, the foreign matter is stopped at the foreign matter removal device for sand removal by the strainer 11, and the impeller 6a,
Foreign matter will not reach 6b.

Therefore, the impellers 6a and 6b are protected from the danger of foreign substances, and since foreign substances are not mixed in the pumped water, it can also be used as a private water supply facility and used as drinking water.

In this foreign matter removal device for removing sand, the extended discharge channel 7 can be formed long in the axial direction, so the area of the strainer 11 can be extremely enlarged.
Even if the mesh of the wire mesh constituting the strainer 11 were made extremely fine, it would take an extremely long time for the well to become clogged with foreign matter.

Therefore, considering the actual state of the conventional submersible pump as shown in FIG. 3, it is possible to extend the life of the submersible pump as long as it is virtually free from clogging due to foreign matter.

In addition, when such an axially long strainer 11 is used, since foreign substances are usually present at the bottom of the well and are sucked up by pumping water, the strainer 11 becomes clogged sequentially from the lower part, and the upper flange 10 becomes clogged. It will take quite a long time for all the clogs to reach the vicinity of .

In addition, the strainer 11 with a fine mesh can be constructed, and even the smallest foreign matter can be removed.This effect eliminates restrictions on the wells in which this type of submersible pump can be used, and greatly improves its practicality.

Such a structure of the strainer 11 has the advantage that when the pump casing 3 and the extended discharge waterway 7 are integrated, the structure is strong and simple.

In particular, when the area of the strainer 11 becomes large,
This slows down the flow rate and prevents foreign matter such as sand from floating up from the bottom of the well, resulting in better foreign matter removal effects.

"Effects of the invention" According to the invention, foreign substances such as sand mixed in well water can be reliably removed, and there are no restrictions on the wells that can be used.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the main parts of a submersible pump according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing the main parts, and FIG. FIG. FIG. 4 is a vertical sectional view of the main parts of a conventional submersible pump. P...Submersible pump, 2...Pump body, 3...Pump casing, 4...Suction port, 7...Extended discharge waterway, 8...Discharge waterway, 9...Discharge port, 10...
Tsuba, 11...Strainer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a submersible pump having a pump body above the motor part, a suction port is provided on the top surface of the pump casing, a discharge port is attached to the suction port, and the discharge port is connected in the axial direction. a flange is provided at the upper end of the flange and the pump casing is provided with a flange for removing sand with the suction port inside and a net formed on the outer periphery between the flange and the pump casing. A submersible pump characterized by being equipped with a foreign matter removal device. (2) The submersible pump according to claim 1, wherein the extended discharge waterway is formed integrally with the pump casing.