JP2001304163A - Pump facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump facility with a flooding preventive structure capable of continuously driving the pump and protecting a motor. SOLUTION: This pump facility comprising a pump, a motor for driving this pump part, a rotor such as a shaft coupling for coupling the pump with the motor and a shaft is provided with a watertight structure part covering a gap between a motor casing of the motor and the rotor so that the motor is protected from being flooded even if the surface of the pump is flooded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump facility, and more particularly to a pump facility having a structure for preventing inundation.

[0002]

2. Description of the Related Art Conventionally, pump facilities installed in the atmosphere cannot be operated continuously when a motor is flooded. Therefore, when designing a pump facility, an installation place and an installation height which are not flooded beforehand are examined. are doing.

[0003] Such conventional pump equipment will be described with reference to FIG. In the figure, the pump equipment includes a pump unit 1, a motor unit 2 for driving the pump unit, and a rotating unit 3 such as a shaft coupling or a shaft connecting the motor unit 2 and the motor unit 2.
However, in such a pump equipment, since the gap 4 exists between the motor casing and the rotating body 3, even if the motor has a water-tight structure, the water level of the flooded water is equal to or higher than the height near the motor. In such a case, it is conceivable that water flows in from the gap 4 or water infiltrates from each gap in the motor casing. If water is generated from such a gap, the motor will break down and the pump will not be able to continue operation.

[0004]

As described above, conventional countermeasures against flooding of pump equipment are taken by measures on the environment side such as an installation location, and almost no countermeasures against flooding on the pump equipment side are taken. Was. The present invention (Claims 1 to 1)
0) was made in view of the above situation, and in consideration of the difficulties in preventing inundation in surrounding environmental measures, etc., in pump equipment already installed or planned in the future, Accordingly, an object of the present invention is to provide a pump equipment having a flood prevention structure that enables continuous operation of the pump and protection of the motor by responding to the above.

[0005]

According to a first aspect of the present invention, there is provided a pump unit, a motor unit for driving the pump unit, and a shaft connecting the pump unit and the motor unit. In a pump facility having a rotating body such as a joint or a shaft, a watertight structure is provided to cover a gap between a motor casing of the motor section and the rotating body. According to the first aspect of the present invention, since the water does not enter the motor section, the motor can be operated.

According to a second aspect of the present invention, in the pump equipment according to the first aspect, a drain line for discharging a ground drain is provided in the watertight structure. According to the second aspect of the present invention, the drainage of the fluid in the watertight structure can be performed so that the ground drain generated in the watertight structure does not enter the motor.

According to a third aspect of the present invention, in the pump equipment according to the first aspect, a tank for storing a ground drain generated in the watertight structure is provided. According to the third aspect of the invention, the ground drain generated in the watertight structure is discharged to the tank, so that the motor does not flood.

According to a fourth aspect of the present invention, in the pump equipment according to the third aspect, a drain line is provided at a lower portion of the tank, and an openable valve and a pump section are provided in the drain line.

According to the fourth aspect of the present invention, since the drain line provided at the lower part of the tank has an openable / closable valve, it is possible to prevent a backflow from the drain in an emergency. In addition, by closing the valve with the interlock, it is possible to remotely prevent the fluid from flowing into the pump watertight structure due to the reverse flow from the drainage destination and the motor being flooded.

According to a fifth aspect of the present invention, in the pump equipment according to the fourth aspect, a pump unit for discharging a ground drain is provided with an interlock function for starting and stopping.

According to the fifth aspect of the present invention, by providing the pump with an interlock function, when the ground drain generated in the watertight structure reaches a certain level or when the pressure of the drain line becomes high, the automatic operation is performed. Drainage becomes possible.

According to a sixth aspect of the present invention, in the pump equipment according to the fifth aspect, the vertical pump has a drain line having an MO valve for discharging a normal ground drain to a water tank. The MO valve is closed, separated from the water intake tank, a pump with an interlock function is activated, and drain is discharged.

According to the invention described in claim 6, in the vertical pump, the drain at normal time is drained to the water intake tank, and when the pressure of the water intake tank rises due to a tsunami or the like and the drainage becomes difficult, the drainage to the water intake tank is performed. The MO valve on the drain line is closed, the pump for drain transfer is activated by an interlock, and the drain can be transferred to another drainage destination. As a result, backflow from the water intake tank can be prevented, and the drain can be drained smoothly.

According to a seventh aspect of the present invention, in the pump equipment having a pump section, a motor section for driving the pump section, and a motor base for mounting the motor section, the motor base has a watertight structure. I do. According to the seventh aspect of the present invention, since the ground drain accumulates in the motor base, flooding of the motor can be prevented.

According to an eighth aspect of the present invention, in the pump equipment having a pump section and a motor section for driving the pump section, gas is discharged from the inside of the motor section to the pump rotating body side, or the inside of the motor section is added. Pressing prevents water from entering the inside of the motor section.

According to the eighth aspect of the invention, even when the water level of the flooded water is higher than the motor level, gas can be discharged from the inside of the motor or the inside of the motor can be set at a high pressure to prevent flooding of the motor.

According to a ninth aspect of the present invention, in the pump equipment according to the first or seventh aspect, the watertight structure is submerged and purge water is injected into a gland. According to the ninth aspect of the present invention, it is not necessary to consider a countermeasure for preventing the motor from being flooded by using a system configuration in which the motor is always immersed in water so that the wet motor can be used. At this time, if the pressure of the fluid in the watertight structure is high, there is a possibility that the ground drain from the inside of the pump to the gland is not discharged. Therefore, by supplying purge water to the gland, seizure of the gland is prevented. be able to.

According to a tenth aspect of the present invention, in a pump facility having a pump section, a motor section for driving the pump section, and a shaft coupling connecting the pump section and the motor section, the shaft of the rotating body section is provided. The rotor is provided with a collar so that the fluid does not penetrate into the motor.

According to the tenth aspect of the present invention, when the pressure in the water intake tank increases due to a tsunami or the like and the internal pressure of the pump increases, the amount of drain from the ground drain increases. in this case,
When the drain spouts vigorously, there is a possibility that the drain will hit the axis of the rotating body portion and will be flooded into the motor portion. For this reason, by having a flange on the circumference of the rotating body portion, it is possible to prevent water from entering the motor section.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a pump equipment according to a first embodiment (corresponding to claim 1) of the present invention.

As shown in the drawing, the pump equipment according to the present embodiment includes a pump unit 1, a water-tight motor unit 2 for driving the pump unit 1, and a shaft connecting the pump unit 1 and the motor unit 2. It comprises a rotating body 3 such as a joint or a shaft. Since there is a gap 4 between the motor casing of the motor section 2 and the rotating body 3, the gap 4 is formed so as to prevent water from flowing from the gap 4. A watertight structure 5 having a shape that covers the space is provided.

According to the present embodiment, as shown in the figure, even if the water level to be flooded is higher than the motor section 2, only the hatched portions in the figure are flooded, and the motor section 2 is not flooded. Therefore, the pump can be operated continuously, and the motor unit 2 is protected.

FIG. 2 is a schematic sectional view of a pump equipment according to a second embodiment (corresponding to claims 1 to 3) of the present invention. As shown in the figure, in the present embodiment, a drain line 6 is provided below the watertight structure 5 in FIG. Therefore, even if the ground drain accumulates in the watertight structure 5, the drain is discharged to the tank 7 via the drain line 6, so that there is no possibility that the motor 2 is flooded and the motor breaks down.

FIG. 3 is a schematic sectional view of a pump equipment according to a third embodiment (corresponding to claims 1 to 3) of the present invention. As shown in the drawing, the present embodiment differs from the second embodiment in FIG. 2 in that a vent pipe 8 is provided in a tank 7. According to the present embodiment, when the stop valve of the drain line 6 of the tank 7 is closed, it serves to transfer the ground drain from the watertight structure 5 without any problem.

Even if the surroundings are flooded by a tsunami, heavy rain, or the like, if the vent pipe 8 has a sufficient length, the ground drain can be discharged even in such a situation, so that flooding of the motor can be prevented. Therefore, it is useful for a pump that requires continuous operation, particularly when the pump and the motor are completely flooded by unexpectedly large tsunami or heavy rain.

FIG. 4 is a schematic sectional view of a pump equipment according to a fourth embodiment (corresponding to claims 1 to 3) of the present invention. As shown in the drawing, the present embodiment differs from the third embodiment in FIG. 3 in that an auto vent valve 9 is installed in a vent pipe 8 provided in a tank 7. According to the present embodiment, when the stop valve of the drain line 6 of the tank 7 is closed, or when pressure from the water intake tank is applied due to a tsunami and the pressure in the tank 7 is increased, the auto vent valve 9
Thus, venting becomes possible, and there is an effect that the ground drain is smoothly transferred from the watertight structure 5.

FIG. 5 is a schematic sectional view of a pump equipment according to a fifth embodiment (corresponding to claims 2 to 5) of the present invention. As shown in the drawing, this embodiment is different from the second embodiment shown in FIG.
The drain line 10 is provided with a tank drain stop valve 11 that can be opened and closed. Further, a valve with an interlock can be used instead of the drain line stop valve 11. If this interlocking valve is provided, it is possible to cut off the drainage destination depending on the situation.

FIG. 6 is a schematic sectional view of a pump equipment according to a sixth embodiment of the present invention (corresponding to claims 2 and 6). As shown in the drawing, this embodiment has a drain discharge pump 12 for discharging the ground drain stored in the pump watertight structure 5 instead of the tank 7 of the second embodiment in FIG. An MO valve 13 is provided on a drain line to a water tank. In addition, by providing the drain discharge pump 12 with an interlock function, drainage can be automatically performed when the ground drain generated in the watertight structure 5 reaches a certain level or when the pressure of the drain line increases. Becomes Furthermore, in the case of a vertical pump, the drain during normal operation is drained to the intake tank, and when the pressure of the intake tank rises due to a tsunami and drainage becomes difficult, the MO valve 13 on the drain line to the intake tank is closed, The drain transfer pump 12 is activated by the interlock, and the drain can be transferred to another drainage destination.

FIG. 7 is a schematic sectional view of a pump equipment according to a seventh embodiment (corresponding to claim 7) of the present invention. As shown in the figure, the present embodiment is different from the embodiment of FIG. 1 in that the motor base 14 has a watertight structure instead of the watertight structure 5. In the present embodiment, since the ground drain accumulates in the motor base 14, the motor drain 1
Drain inside 4 is discharged, and it becomes possible to prevent flooding of the motor.

FIG. 8 is a schematic sectional view of a pump equipment according to an eighth embodiment (corresponding to claim 8) of the present invention. As shown in the figure, the present embodiment has a configuration of a pump facility capable of discharging gas from inside the motor unit 2. With such a configuration, the function of preventing water from entering the motor works. In addition, it is possible to discharge gas from the inside of the motor unit 2 by installing an accumulator in the vicinity as a gas supply means or increasing the pressure inside the motor unit 2 using high-pressure air or high-pressure nitrogen gas.

Further, the gas is not discharged from the motor section 2 in the normal state, and the gas is discharged from the motor section 2 by an interlock when the motor may be flooded.

FIG. 9 is a schematic sectional view of a pump equipment according to a ninth embodiment (corresponding to claim 9) of the present invention. As shown in the figure, the present embodiment is configured such that the motor unit 2 is submerged using a wet motor. Thus, it is not necessary to consider a countermeasure against flooding of the motor unit 2. Normally, a vertical pump is configured such that fluid inside the pump slightly flows out to the gland so that seizure does not occur on the gland.

However, as in the present embodiment, when a pump of a wet motor is used to submerge the inside of the watertight structure 5 of FIGS. 1 to 6 or the watertight structure of the motor base 14 of FIGS. 7 and 8. Since the inside of the watertight structure 5 and the inside of the motor stand 14 are filled with the fluid, depending on the pressure of the watertight structure, the pump internal fluid does not flow through the gland to the outside watertight structure, There is a possibility that the gland packing may cause seizure and hinder the pump operation. For this reason, in the present embodiment, by supplying purge water of a higher pressure than the inside to the gland part by the purge line 15 from the outside, seizure of the gland packing part is prevented and continuous operation of the pump is possible. It is assumed that. FIG. 9 shows an example of a pump having the watertight structure 5.

FIG. 10 is a schematic sectional view of a pump equipment according to a tenth embodiment (corresponding to claim 9) of the present invention. As shown in the figure, in the present embodiment, a watertight structure 16 that covers a pump motor is installed at a pump installation location or a pump body. With such a pump facility, the motor is prevented from being flooded by the fluid from above, and even if the water level of the fluid immersed from below becomes near or above the motor, the inside of the structure 16 that covers the motor can be prevented. The motor is not flooded by the atmosphere, and the pump can be continuously operated. Note that there is no problem if the lower part of the structure 16 is not watertight.

When the water level of the fluid submerging the pump such as a tsunami is considerably high, the gas in the structure 16 may be compressed and the water level in the structure 16 may rise. By taking into account gas supply equipment and systems, such as installing an accumulator so that gas can be supplied into the structure 16, flooding of the motor can be prevented even when the water level becomes extremely high.

FIG. 11 is a schematic sectional view of a pump equipment according to an eleventh embodiment (corresponding to claim 10) of the present invention. As shown in the figure, the present embodiment relates to a pump unit having a pump unit 1, a motor unit 2 for driving the pump unit 1, and a rotary unit 3 such as a shaft coupling and a shaft connecting the pump unit 1 to the rotary unit. The collar 17 is provided on the circumference of No. 3.

For example, the pressure in the water intake tank increases due to a tsunami or the like, the pressure applied to the pump gland increases, and the amount of drain from the ground drain increases. In this case, when the drain blows out with considerable force, the drain may travel along the axis of the rotating body portion 3 and flood the motor portion 2.

In this embodiment, since the collar 17 is provided on the circumference of the rotating body 3, the drain running along the axis of the rotating body 3 is interrupted by the collar 17 and does not reach the motor section 2; Water can be prevented from entering the part 2 and the drain can be collected efficiently.

FIG. 2 shows a modification of the present embodiment.
By executing any one of the drain discharge means shown in each embodiment of FIG. 6 to FIG. 6, the drain can be collected more efficiently so as not to be flooded to the motor side.

[0040]

As described above, the present invention (Claim 1)
According to the tenth aspect of the present invention, it is possible to prevent the motor from being flooded when the periphery of the pump is flooded by making the watertight structure or the motor stand watertight.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a pump equipment according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a pump equipment according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a pump equipment according to a third embodiment of the present invention.

FIG. 4 is a schematic sectional view of a pump equipment according to a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of a pump equipment according to a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view of a pump equipment according to a sixth embodiment of the present invention.

FIG. 7 is a schematic sectional view of a pump equipment according to a seventh embodiment of the present invention.

FIG. 8 is a schematic sectional view of a pump equipment according to an eighth embodiment of the present invention.

FIG. 9 is a schematic sectional view of a pump equipment according to a ninth embodiment of the present invention.

FIG. 10 is a schematic sectional view of a pump equipment according to a tenth embodiment of the present invention.

FIG. 11 is a schematic sectional view of a pump equipment according to an eleventh embodiment of the present invention.

FIG. 12 is a schematic sectional view of a conventional pump facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump part, 2 ... Motor part, 3 ... Rotating body part, 4 ... Gap, 5 ... Watertight structure part, 6 ... Drain line, 7 ... Tank,
8 ... vent pipe, 9 ... auto vent, 10 ... tank drain line, 11 ... tank drain stop valve, 12 ... drain transfer pump, 13 ... drain line MO valve, 14 ... motor stand, 15 ... purge line, 16 ... Structure covering the motor,
17 ... Spit.

Claims (10)

[Claims] In a pump facility having a pump section, a motor section for driving the pump section, and a rotating body section such as a shaft joint or a shaft connecting the pump section and the motor section, a motor of the motor section is provided. A pump equipment comprising a watertight structure for covering a gap between a casing and the rotating body. 2. The pump equipment according to claim 1, wherein a drain line for discharging a ground drain is provided in the watertight structure. 3. The pump equipment according to claim 1, further comprising a tank for storing a ground drain generated in the watertight structure. 4. The pump equipment according to claim 3, wherein a drain line is provided at a lower portion of the tank, and an on-off valve and a pump section are installed in the drain line. 5. The pump equipment according to claim 4, wherein the pump part for discharging the ground drain has an interlock function for starting and stopping. 6. The pump system according to claim 5, wherein the vertical pump has a drain line having an MO valve capable of discharging a normal ground drain to a water tank, and the MO valve is interlocked. Pump equipment, wherein the pump equipment is configured to be closed and separated from the water intake tank, start a pump with an interlock function, and discharge drain. 7. Pump equipment comprising a pump unit, a motor unit for driving the pump unit, and a motor base for mounting the motor unit, wherein the motor base has a watertight structure. 8. In a pump facility having a pump section and a motor section for driving the pump section, a gas is discharged from the inside of the motor section to the side of the pump rotating body, or the inside of the motor section is pressurized to thereby increase the motor section. Pump equipment characterized by preventing infiltration into the interior of the pump. 9. The pump equipment according to claim 1, wherein the watertight structure is submerged and purge water is injected into a gland. 10. In pump equipment having a pump unit, a motor unit for driving the pump unit, and a shaft coupling connecting the pump unit and the motor unit, fluid flows along an axis of a rotating body unit and the motor Pump equipment characterized in that the rotating body part is provided with a collar so as to prevent water from entering the part.