JP2692722B2 - Submersible pump with drill cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump with an excavating cutter device capable of effectively preventing a motor burnout accident.

[0002]

2. Description of the Related Art Conventionally, a submersible pump has been effectively used for discharging bentonite as a stabilizing solution in, for example, an underground continuous wall construction method.

Here, the underground continuous wall construction method is a method in which a stable liquid is used to excavate the ground with a horizontal multi-axis rotary cutter type excavator while preventing the ground from collapsing, and a rebar cage is inserted to stabilize the ground. It is to build a continuous wall in the ground while exchanging liquid and concrete.

In such a construction method, the excavated earth and sand is sent to the earth and sand separation plant together with the stabilizing liquid by the pumping pump incorporated in the excavator and separated into the earth and the stabilizing liquid, and the high-quality stabilizing liquid is reused.

A submersible pump is effectively used as a pump for pumping mud.

[0006]

However, the submersible pump used for such an application still has the following problems to be solved.

That is, the above-mentioned submersible pump usually has an impeller casing having a suction opening on the lower surface and a discharge opening on the periphery, an impeller arranged in the impeller casing, and an integrally connected upper portion of the impeller casing. The output shaft is connected to the impeller.

On the other hand, in the field where the underground wall construction method is used, the submersible pump is used, for example, at a depth of 90 m, so that the concentration of mud is high and the fluidity is low, so that the cooling of the motor becomes insufficient, The motor temperature rises abnormally,
Eventually, a motor burnout accident occurred. Furthermore, excavated soil tends to adhere to the cutter device below the submersible pump,
In order to remove this, a jet fountain is applied to the cutter from the ground with a high-pressure hose, which has a drawback that the device becomes large-scale.

An object of the present invention is to provide a submersible pump with an excavating cutter device that can solve the above-mentioned problems.

[0010]

According to the present invention, there is provided an impeller casing having a suction opening on a lower surface and a discharge opening on a peripheral edge thereof, and an excavating cutter device arranged below the impeller casing.
In an underwater pump including an impeller arranged in the impeller casing and a motor integrally connected to an upper portion of the impeller casing and having an output shaft connected to the impeller,
The outer circumference of the motor is covered with a cooling jacket, the water inlet of the cooling jacket is connected to the other end of a cooling water inlet pipe having a cooling water inlet at one end, and the water outlet of the cooling jacket is connected to the post-cooling water outlet pipe. While connecting one end,
The present invention relates to a submersible pump with an excavating cutter device in which the other end of the post-cooling water outflow pipe is connected to a suction opening of an impeller casing, and the outflow pipe is also connected to a jet nozzle.

In particular, the post-cooling water outflow pipe is connected to an ejection nozzle provided in the lower part of the impeller casing, and the ejection nozzle is directed toward the cutter of the excavating cutter device arranged below the submersible pump. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Only the submersible pump A from which the part of the excavating cutter device B is omitted will be specifically described below based on the structure shown in the accompanying drawings (FIGS. 1 and 2).

As shown in the figure, the submersible pump A basically has an impeller casing 12 having a suction opening 10 at the center of the lower surface and a discharge opening 11 at the periphery, and an impeller 13 arranged in the impeller casing 12. , Is integrally connected to the upper part of the impeller casing 12 to connect the output shaft 14 to the impeller.
It consists of a motor 15 connected to 13.

Further, one end of a discharge pipe 16 is connected to the discharge opening 11, and the other end of the discharge pipe 16 is led to the outside.

Then, the impeller is driven by driving the motor 15.
When 13 is rotated, muddy water flows into the impeller casing 12 through the suction opening 10 and is then discharged to the outside through the discharge opening 11 and the discharge pipe 16.

However, since the above-mentioned muddy water has a high concentration and a small fluidity, it hardly performs the motor cooling action and the motor 15
When driving in such a state, the temperature of the motor 15 will be abnormally increased.

Therefore, in the submersible pump A which constitutes a part of the embodiment of the present invention, as shown in FIG. 1 and FIG.
The outer circumference of 15 is covered with a cooling jacket 17 consisting of a pair of semi-circular dividing plates 17a, 17b, and the rotational force of the motor 15 is used to forcefully inject mud water with low concentration and high fluidity. However, the motor 15 is effectively cooled.

That is, the cooling jacket 17 has one end of a cooling water inflow pipe 20 connected to a water inflow port 18 provided at the upper portion thereof, and the other end of the cooling water inflow pipe 20 serves as a cooling water inflow port 21 above the submersible pump A. It is open to mud water with low concentration and high fluidity located at (Fig. 3).

The cooling jacket 17 has one end of the after-cooling water outflow pipe 23 connected to the water outlet 22 provided at the lower portion thereof, and the other end of the after-cooling water outflow pipe 23 is connected to the suction opening 11 of the impeller casing 12. Is in communication with.

With this structure, when the motor 15 is driven, the high-concentration muddy water around the submersible pump A can be discharged to the outside through the impeller casing 12 and the discharge pipe 15 as described above, and the suction opening of the impeller casing 12 can be discharged. Utilizing suction negative pressure generated in 10, submersible pump A
It is possible to effectively cool the motor 15 by heat exchange by flowing a low-concentration muddy water having a high fluidity located above the inside of the cooling jacket 17 into the cooling jacket 17. By such cooling, the motor
It is possible to reliably prevent a burnout accident or the like due to the temperature rise of 15.

After that, the muddy water after cooling is cooled by the water outflow pipe.
It flows into the suction opening 11 of the impeller casing 12 through 23, is mixed in high-concentration mud water with low fluidity, and is discharged to the outside through the impeller casing 12 and the discharge pipe 16 integrally.

However, since the mud water flowing into the impeller casing 12 from the water outflow pipe 23 after cooling is a low-concentration mud water having high fluidity, the above-mentioned high-concentration operation of the submersible pump A and the submersible pump A are When it is operated in a state of being buried in, the concentration can be adjusted and the motor 15 of the submersible pump A can be prevented from being burned.

Since the post-cooling water outflow pipe 23 is piped along the discharge opening 11 formed of a large-diameter pipe in this embodiment, it is possible to effectively prevent a damage accident during transportation and installation of the submersible pump A. It can be prevented.

In the figure, 30 is an opening / closing valve attached to the lower end of the cooling water inflow pipe 20, 31 is an inspection window attached to the side of the cooling jacket 17 so as to be openable and closable, 32 is a power supply cable to the motor 15, and 33 is The support legs are attached to the peripheral edge of the bottom of the impeller casing 13.

Further, another embodiment of only the submersible pump A according to the present invention is shown in FIG.

The submersible pump A shown in FIG. 4 is a cooling water inflow pipe.
The cooling water inlet 21 forming the upper end of the cooling water inlet 21 is provided with a cooling water pumping device 40 including a small submersible pump.

When the negative pressure generated in the impeller casing 13 is not sufficient, the cooling water is forcibly flown into the cooling jacket 17 by the cooling water pump 40.
Can be cooled.

The submersible pump with the excavating cutter device of the present invention has the same construction as the submersible pump A described above, and has the excavating cutter device B.
As shown in FIG. 5, the submersible pump A described above is attached to the suspension frame 50 arranged in the excavation hole H, and the excavation cutter device B is provided below the submersible pump A.
Attached, and after cooling the submersible pump A, the water outflow pipe (23)
The midway of the jet was connected to the jet nozzle (51) provided at the bottom of the impeller casing (12), and the jet nozzle (51) was directed toward the cutter (52) of the excavating cutter device (B) below the submersible pump. It is characterized by

With this structure, after the motor 15 of the submersible pump A is cooled, part of the water can be sucked into the impeller casing 15, and the rest of the cooled water is radially mounted below the submersible pump A. It is supplied to the jet nozzle 51, and the cutter of the excavating cutter device B is supplied from the jet nozzle 51.
By ejecting toward the cutter 52, it is possible to prevent clods from adhering to the cutter 52 and maintain a good excavation capability.

The embodiment shown in FIG. 6 is a cooling water pressure-feeding device 60.
Is composed of a land pump installed on the ground F.

Also in this case, muddy water having a low concentration and a high fluidity is sucked into the cooling water pumping device 60 through the suction pipe 61, and then the cooling jacket 17 is passed through the cooling water inflow pipe 20.
To cool the motor 15. And,
As in the embodiment of FIG. 5, the cooled water is pressure-fed to the impeller casing 15 and the jet nozzle 51, and the cooled water is jetted from the jet nozzle 51 toward the cutter 52 of the excavating cutter device B, whereby the cutter A good excavation capacity can be maintained by preventing clods from adhering to 52.

In some cases, the cooling jacket 17
It is also possible to release the communication connection with the impeller casing 15 and supply all the cooled water after being fed from the cooling water pressure-feeding device 60 to the cooling jacket 17 to prevent clogging of the cutter 52 with clods.

[0033]

According to the present invention, an impeller casing having a suction opening on the lower surface and a discharge opening on the peripheral edge,
Excavation cutter device including an excavation cutter device arranged below the impeller casing, an impeller arranged in the impeller casing, and a motor integrally connected to the upper part of the impeller casing and having an output shaft connected to the impeller. In the attached submersible pump, the outer circumference of the motor is covered with a cooling jacket, and the water inlet of the cooling jacket is connected to the other end of the cooling water inflow pipe provided with the cooling water inlet at one end and to the water outlet of the cooling jacket. Connect one end of the after-cooling water outflow pipe, connect the other end of the after-cooling water outflow pipe to the suction opening of the impeller casing, and connect the middle of the after-cooling water outflow pipe to the jet nozzle provided in the lower part of the impeller casing. Excavation characterized by being connected in communication and directing the jet nozzle to the cutter of the excavating cutter device arranged below the submersible pump On the submersible pump with a Potter apparatus.

With this configuration, when the motor is driven, the high-concentration muddy water around the submersible pump can be discharged to the outside through the impeller casing and the discharge pipe, and the suction negative pressure generated at the suction opening of the impeller casing can be used. As a result, mud having a high fluidity and a low concentration located above the submersible pump can flow into the cooling jacket to effectively cool the motor by heat exchange. By such cooling, it is possible to reliably prevent a burnout accident or the like due to the temperature rise of the motor.

Further, since the mud water flowing into the impeller casing from the water outflow pipe after cooling is a low concentration mud water having high fluidity, the submersible pump is operated at a high concentration and the submersible pump is operated in a state of being buried in the earth and sand. In this case, the concentration can be adjusted and the motor of the submersible pump can be prevented from being burned. Further, by utilizing the suction negative pressure generated at the suction opening of the impeller casing, water is jetted after cooling from the jet nozzle to the cutter of the excavating cutter device to remove adhesion of clods and the like to the cutter and improve excavating ability. Thus, there is an effect that the cooling of the motor and the removal of the clod to the cutter can be achieved with a simple structure by using the suction negative pressure generated in the suction opening of the impeller casing. .

[Brief description of the drawings]

FIG. 1 is a front view of only a submersible pump without an excavation cutter device in a submersible pump with an excavation cutter device according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged cutaway view of the relevant part.

FIG. 4 is a front view showing another structure of the submersible pump excluding the excavation cutter device.

FIG. 5 is a front view of a submersible pump with an excavating cutter device according to the present invention.

FIG. 6 is a front view of a submersible pump with an excavating cutter device according to another embodiment of the present invention.

[Explanation of symbols]

 A Submersible pump 10 Suction opening 11 Discharge opening 12 Impeller casing 13 Impeller 14 Output shaft 15 Motor 17 Cooling jacket 18 Water inlet 20 Cooling water inlet pipe 21 Cooling water inlet 22 Water outlet 23 Water outlet after cooling

Claims (1)

(57) [Claims] 1. An impeller casing (12) having a suction opening (10) on the lower surface and a discharge opening (11) on the periphery, and an excavating cutter device (B) arranged below the impeller casing (12). A motor (1) integrally connected to the impeller (13) arranged in the impeller casing (12) and an upper part of the impeller casing (12), and connecting the output shaft (14) to the impeller (13).
In a submersible pump with an excavating cutter equipped with 5), the outer circumference of the motor (15) is covered with a cooling jacket (17), and a cooling water flow is provided at one end at the water inlet (18) of the cooling jacket (17). The other end of the cooling water inflow pipe (20) provided with the inlet (21) is connected, the water outlet (22) of the cooling jacket (17) is connected to one end of the water outflow pipe (23) after cooling, and the same cooling is performed. Connect the other end of the after-water outlet pipe (23) to the suction opening (10) of the impeller casing (12).
The water outlet pipe (23) after cooling is connected to the jet nozzle (51) provided at the lower part of the impeller casing (12) so that the jet nozzle (51) is located below the submersible pump. A submersible pump with a drilling cutter device, characterized by being oriented to the cutter (52) of the drilling cutter device (B).