JP2020133434A - Pump facility - Google Patents

Abstract

To provide a pump facility capable of operating a pump even in a case of being submerged.SOLUTION: A pump facility 10 is configured to comprise: a pump main body 11 comprising a suction pipe 12 and a bend pipe 13; a motor holding table 30 comprising a cylindrical part 31 disposed so as to cover the bend pipe 13 and having a ventilation hole 33 and an opening 32 through which the bend pipe 13 passes on a side surface, and a pedestal part 34; a water intrusion prevention housing 22 disposed in a watertight state on the pedestal part 34; a partition member 23 fixed to the pedestal part 34, disposed inside the water intrusion prevention housing 22, having a vent hole 26 below the pedestal part 34, and having a cylindrical shape with an upper end 24 and a lower end 25 opened; and a motor 21 disposed inside the partition member 23 on the motor holding base 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to pump equipment.

In the pump equipment, if the pump and motor are submerged due to heavy rain or tsunami, continuous pump operation becomes impossible. Therefore, it is known to use a water resistant motor.

Patent Document 1 discloses a method of preventing water ingress of a motor by forming a watertight structure around the motor. However, when the pump is operated, the motor continuously generates heat, so it is necessary to cool it. However, this method does not consider the cooling of the motor, and it is actually difficult to operate the pump properly when submerged. Is.

JP 2001-304163

An object of the present invention is to enable the operation of a pump when the pump equipment is submerged.

In order to solve the above problems, the pump equipment of the present invention is a cylinder provided with a suction pipe and a bend pipe so as to cover the bend pipe and having a ventilation hole and an opening through which the bend pipe passes on a side surface. A motor holding base including a shape portion and a pedestal portion, a water intrusion prevention housing disposed on the pedestal portion in a watertight state, and fixed to the pedestal portion and inside the water intrusion prevention housing. A tubular partition member having ventilation holes below the pedestal portion and having open upper and lower ends, and inside the partition member on the motor holding table. It is equipped with a motor.

According to the pump equipment having the above configuration, the connection portion between the motor holding base and the water intrusion prevention housing has a watertight structure, and the pedestal portion of the motor holding base has a communicating portion. As a result, even if the entire pump is submerged, air can be retained above the ventilation holes of the water intrusion prevention housing and the motor holding base or the opening through which the bend pipe passes, and even if water pressure is applied. The air in the motor holding base is compressed in the direction of the water intrusion prevention housing, and the air opposes the water pressure so that water does not enter and the motor can be prevented from inundating.

Further, a partition member is provided inside the motor holding base and the water intrusion prevention housing. Since the partition member has ventilation holes on the side surface, an air path used for cooling the motor when the pump is submerged is secured. This enables continuous operation of the pump even when submerged.

Further, the maximum length of the pedestal portion is longer than the width of the water intrusion prevention housing.

According to this aspect, since a large amount of air is held inside the motor holding base, this air opposes the water pressure and prevents the ingress of water. This makes it possible to prevent the motor from being flooded.

Further, the partition member forms a medium space in which the cooling medium is enclosed.

According to this aspect, since the air used for cooling the motor is cooled, the motor can be cooled more efficiently than the natural heat dissipation.

Further, a heat exchanger provided in either the suction pipe or the bend pipe to cool the cooling medium in the medium space is further provided.

According to this aspect, since the cooling medium is cooled, the air used for cooling the motor can be cooled.

Further, a water level gauge arranged inside the motor holding table and a compressor for supplying gas to the inside of the motor holding table are further provided.

According to this aspect, the rise in the water level can be suppressed by measuring the rise in the water level inside the motor holding base and supplying gas from the compressor to the inside of the motor holding base according to the water level.

The suction pipe extends in the vertical direction, and the pump body has a spindle extending in the vertical direction in the suction pipe, an output shaft connected to the spindle, and an impeller fixed to the spindle at the lower part of the suction pipe. The motor rotates the main shaft.

According to this aspect, since the motor can be installed at an upper position, it is possible to prevent water from entering the motor.

According to the pump equipment of the present invention, the pump can be operated even when the pump equipment is submerged.

The schematic cross-sectional view which shows the normal time of the pump equipment of this invention. The schematic right side view of the pump equipment of FIG. The plan view of the motor holding table of the pump equipment of FIG. FIG. 6 is a schematic cross-sectional view showing when the pump equipment of FIG. 1 is submerged. The schematic cross-sectional view which shows the bend pipe of the pump equipment of FIG. The schematic cross-sectional view which shows the bend pipe of the pump equipment of FIG. The schematic diagram which shows the pump equipment. The schematic diagram which shows the pump equipment. FIG. 6 is a schematic cross-sectional view showing when the pump equipment of FIG. 1 is submerged.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows the pump equipment 10 of the present invention. With reference to the figure, the pump equipment 10 includes a pump main body 11, a motor 21 for driving the pump main body 11, a motor holding base 30 for mounting the motor 21, a water intrusion prevention housing 22, and a partition member 23. .. Regarding the positional relationship between them, the motor holding base 30 is arranged so as to cover the pump main body 11, the water intrusion prevention housing 22 is provided above the motor holding base 30, and the partition member 23 is provided inside the water intrusion prevention housing 22. A motor 21 is provided inside the partition member 23.

The pump main body 11 is, for example, a vertical shaft pump arranged in a drainage pump station, and includes a suction pipe 12 and a bend pipe 13 piped in the vertical direction, and a spindle 17 extending in the vertical direction in the suction pipe 12 and a spindle 17 The output shaft 18 connected to the main shaft 17, the impeller 14 fixed to the lower part of the main shaft 17, and the motor 21 for rotating the main shaft 17 are provided. By rotating the impeller 14 via the spindle 17, the motor 21 draws water from the suction pipe 12 and drains it through the bend pipe 13.

The motor holding base 30 has a tubular portion 31 and a pedestal portion 34, and the pedestal portion 34 is attached to the upper end of the open tubular portion 31. With reference to FIG. 2, the tubular portion 31 is provided with an opening 32 through which the bend pipe 13 passes and a ventilation hole 33 located facing the opening 32. The opening 32 has an arch shape, and in the present embodiment, the upper end thereof is located above the ventilation hole 33. The upper end of the opening 32 may be located below the ventilation hole 33.

With reference to FIG. 3, the pedestal portion 34 has a disk shape, has a shaft hole 35 penetrating in the thickness direction at the center, and the inner peripheral edge 36 and the outer peripheral edge 37 are arranged at intervals in the radial direction. , The inner peripheral edge 36 and the outer peripheral edge 37 are connected by connecting portions 38 at a plurality of locations. A plurality of communication portions 39 penetrating in the thickness direction are formed between the inner peripheral edge 36 and the outer peripheral edge 37, and the inside of the motor holding base 30 and the inside of the water intrusion prevention housing 22 pass through these communication portions 39. Can move air to each other. A motor 21 is attached to the upper part of the inner peripheral edge 36.

Further, the diameter of the pedestal portion 34 is set to be longer than the diameter of the water intrusion prevention housing 22. The effect of this will be described later.

The partition member 23 is a tubular body in which the upper end 24 and the lower end 25 are open, the upper end 24 is located at a space downward from the upper end of the water intrusion prevention housing 22, and the lower end 25 is the cylinder of the motor holding base 30. It is provided at a position lower than the ventilation hole 33 and the opening 32 of the shape portion 31.

Further, the partition member 23 is connected orthogonally to the center in the length direction of each connecting portion 38. The partition member 23 has a ventilation hole 26 below the pedestal portion 34.

The water intrusion prevention housing 22 includes a tubular portion 22a having an opening 22b at the lower end and a lid portion 22c. The partition member 23 is arranged on the outside at a distance from the partition member 23, and the upper end 24 of the partition member 23 is located below the lid portion 22c to secure a ventilation path. The water intrusion prevention housing 22 is arranged above the pedestal portion 34, and the connection surface with the pedestal portion 34 has a watertight structure.

Next, the flow of air that cools the motor 21 when the pump is not submerged will be described.

Generally, the motor generates heat while the pump is in use. Therefore, when the pump is continuously operated, it is necessary to cool the motor to prevent overheating of the motor.

With reference to the arrows shown in FIG. 1, the hot air generated by the motor 21 is forcibly sent downward by the fan of the motor 21. At that time, the hot air passes along the inside of the partition member 23 and also passes through the communication portion 39, and is discharged to the outside from the opening 32 and the ventilation hole 33 formed in the motor holding base 30.

At the same time, outside cold air is sucked from the opening 32 and the ventilation hole 33, and passes along the outside of the partition member 23 and also through the communication portion 39, and the tubular portion 22a of the water intrusion prevention housing 22 and the partition member 23. Air is supplied to the motor 21 through the space between the motor 21 and the motor 21.

Therefore, since cold air is always supplied to the motor 21, the motor 21 can be cooled. Further, since the lower end 25 of the partition member 23 is located below the upper end of the opening 32 and the ventilation hole 33 of the motor holding base 30, hot air can be efficiently guided to the opening 32 and the ventilation hole 33.

Subsequently, a state in which the pump is submerged will be described with reference to FIG.

When the pump equipment 10 reaches the water level at the time of submersion shown in FIG. 4, water enters the motor holding base 30 through the opening 32 and the ventilation hole 33, but the lower end of the water intrusion prevention housing 22 and the motor holding base 30 Since the connection portion with the motor has a watertight structure, it is possible to hold an amount of air sufficient to remove water between the space 40 above the opening 32 of the motor holding base 30 and the inside of the water intrusion prevention housing 22.

Further, since the communication portion 39 of the pedestal portion 34 has a structure of ventilating, when water pressure is applied, the air in the space 40 is compressed in the direction of the water intrusion prevention housing 22. By countering the water pressure, this air can prevent the ingress of water and prevent the motor 21 from being submerged.

Here, referring to FIGS. 5 and 6, the diameter of the pedestal portion 34 (diameter B in FIG. 5) is set to be longer than the diameter of the water intrusion prevention housing 22 (diameter A in FIGS. 5 and 6). Has been done. For example, when the diameter of the pedestal portion 34 is the same as the diameter of the water intrusion prevention housing 22 and is A, the water level rises in proportion to the water pressure, but when the diameter of the pedestal portion 34 is B, the diameter is A. Since the volume of air that can be retained increases compared to the case, the amount of increase in the water level when submerged decreases. Therefore, air can be reliably left in the water intrusion prevention housing 22, and the motor 21 can be prevented from being submerged.

Next, the flow of air in a state where the pump is submerged will be described.

The hot air generated by the motor 21 is forcibly sent downward by the motor 21 through the inside of the partition member 23. Air passes through the ventilation holes 26 provided in the partition member 23, passes between the outside of the partition member 23 and the tubular portion 22a of the water intrusion prevention housing 22, and is supplied to the motor 21 again. The air circulates in the closed space due to the rise in the water level due to submersion, but when the hot air from the motor 21 passes through the ventilation hole 26, it comes into contact with the water that has entered the motor holding base 30 and is dissipated. The heat of the motor 21 can be exhausted by being sent to the motor 21 again.

Further, the partition member 23 is formed with a medium space for enclosing the cooling medium inside, and the air can be cooled more efficiently by coming into contact with the cooling medium. The cooling medium that has exchanged heat with the hot air is cooled by the heat exchanger 19 provided in the bend pipe 13, and is sent back to the inside of the partition member 23 by operating the circulation cooling pump 20 installed outside the pump. Be done. As a result, the air generated by the motor 21 can be efficiently cooled. The heat exchanger 19 may be provided in any of the suction pipe 12, the discharge pipe (not shown), the flange portion 15 of the bend pipe 13, or the shaft sealing portion 16.

FIG. 7 shows a diagram in which the cooling pipe 41 is arranged inside the bend pipe 13. By arranging the cooling pipe 41 inside the bend pipe 13, the water flowing in the bend pipe 13 has a high flow velocity, so that heat exchange can be performed efficiently.

Further, as shown in FIG. 8, since it is also cooled by the water around the bend pipe 13, the cooling pipe 41 may be arranged so as to wind around the outside of the bend pipe 13. In this case, since the flow velocity of the water around the bend pipe 13 is small, the amount of heat exchange per unit area is smaller than that when the cooling pipe 41 is arranged inside. Therefore, it is preferable to secure a large area for heat exchange such as increasing the number of turns of the cooling pipe 41.

However, when the pump is operated for a long period of time when submerged in water in this way, the air held in the motor holding base 30 and the water intrusion prevention housing 22 may dissolve in water, the water level may rise, and the motor 21 may be submerged. is there.

With reference to FIG. 9, the pump equipment 10 further includes a water level gauge 45, a compressor 42, a control valve 43, and a control unit 44. Further, the compressor 42 includes an air tank (not shown) and is connected to the inside of the water intrusion prevention housing 22.

The water level gauge 45 measures the water level in the motor holding base 30, and when the water level exceeds a predetermined level, the control unit 44 receives a signal from the water level gauge 45, then transmits a signal to the compressor 42, and the compressor 42 receives an air tank. The compressed air of the above is replenished into the water intrusion prevention housing 22. Since the control valve 43 is attached between the compressor 42 and the water intrusion prevention housing 22, the compressed air can be replenished in an arbitrary volume.

Since the water that has entered the motor holding base 30 can be removed by the pressure of the compressed air, it is possible to prevent the motor 21 from being flooded. The compressor 42 can be connected to a plurality of pumps, controlled at the same time, and used in common. Further, although air is automatically replenished in the present embodiment, the control valve 43 may be visually confirmed and the compressor 42 and the control valve 43 may be manually operated.

Since the present invention has a structure for preventing water from entering the motor, the motor used in the pump equipment 10 can be not only a waterproof motor but also a normal motor.

10 ... Pump equipment 11 ... Pump body 12 ... Suction pipe 13 ... Bend pipe 14 ... Impeller 15 ... Flange part 16 ... Shaft sealing part 17 ... Main shaft 18 ...・ Output shaft 19 ・ ・ ・ Heat exchanger 20 ・ ・ ・ Pump 21 ・ ・ ・ Motor 22 ・ ・ ・ Water intrusion prevention housing 22a ・ ・ ・ Cylindrical part 22b ・ ・ ・ Opening 22c ・ ・ ・ Lid part 23 ・ ・・ Partition member 24 ・ ・ ・ Upper end 25 ・ ・ ・ Lower end 26 ・ ・ ・ Ventilation hole 30 ・ ・ ・ Motor holding base 31 ・ ・ ・ Cylindrical part 32 ・ ・ ・ Opening 33 ・ ・ ・ Ventilation hole 34 ・ ・ ・ Pedestal part 35 ... Shaft hole 36 ... Inner peripheral edge 37 ... Outer peripheral edge 38 ... Connecting part 39 ... Communication part 40 ... Space 41 ... Cooling pipe 42 ... Compressor 43 ... Control valve 44 ・ ・ ・ Control unit 45 ・ ・ ・ Water level gauge

Claims (6)

A pump body with a suction pipe and a bend pipe,
A motor holding base provided with a tubular portion arranged so as to cover the bend pipe and having a ventilation hole and an opening through which the bend pipe passes on a side surface, and a pedestal portion.
A water intrusion prevention housing arranged on the pedestal in a watertight state,
A cylindrical partition member that is fixed to the pedestal portion, is arranged inside the water intrusion prevention housing, has ventilation holes below the pedestal portion, and has open upper and lower ends.
A pump facility including a motor arranged inside the partition member on the motor holding table. The pump equipment according to claim 1, wherein the maximum length of the pedestal portion is longer than the width of the water intrusion prevention housing. The pump equipment according to claim 1 or 2, wherein the partition member forms a medium space in which a cooling medium is enclosed. The pump equipment according to claim 3, further comprising a heat exchanger provided in either the suction pipe or the bend pipe and cooling the cooling medium in the medium space. A water level gauge, which is arranged inside the motor holding table and reads the water level in the motor holding table,
A control unit that receives a signal from the water level gauge when the water level exceeds a predetermined level,
The pump equipment according to any one of claims 1 to 4, further comprising a compressor controlled by the control unit and replenishing air in the water intrusion prevention housing. The suction pipe extends in the vertical direction and extends in the vertical direction.
The pump body has a spindle extending in the vertical direction in the suction pipe and
The output shaft connected to the main shaft and
An impeller fixed to the spindle at the lower part of the suction pipe is provided.
The pump equipment according to any one of claims 1 to 5, wherein the motor rotates the main shaft.

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