JP6777573B2 - Pump device - Google Patents

Description

The present invention relates to a pump device for pumping a liquid from a water tank, and more particularly to a pump device including a bearing cooling system.

The pump device is widely used for transferring a liquid such as water stored in a water tank to another place. This type of pumping device includes a pump installed on land and a suction pipe connected to the pump. The liquid inlet of the suction pipe is located in the water tank. The pump includes an impeller fixed to the rotating shaft and bearings that support the rotating shaft. The rotating shaft is connected to a drive source such as an electric motor or an engine. When the drive source rotates the rotating shaft while the inside of the pump is filled with liquid, the impeller of the pump rotates, and the pump can pump the liquid in the water tank.

During the operation of the pump, the bearing supports the rotating shaft, so that the temperature of the bearing rises. Therefore, in order to cool the bearing, the pump device is provided with a bearing cooling system. In this bearing cooling system, as the cooling liquid for cooling the bearing, fresh water supplied from a fresh water supply source other than the water tank (for example, a pressurized water utility) is generally used.

If the supply of fresh water from the fresh water supply source is interrupted for some reason, the bearing is not cooled, the temperature of the bearing rises, and unfavorable results such as seizure of the bearing occur. Therefore, in preparation for such an emergency, the pump device generally includes a backup cooling system that uses the liquid in the water tank to cool the bearings. This backup cooling system can cool the bearing by supplying the liquid from the water tank to the bearing when the supply of fresh water from the fresh water supply source is cut off.

Japanese Unexamined Patent Publication No. 10-205490 Japanese Unexamined Patent Publication No. 2003-120568 Jikkenhei 05-36090

However, since the emergency backup cooling system operates infrequently, impurities such as mud and sand may accumulate near the suction port of the backup cooling system. When such impurities are sucked into the backup cooling system, the piping of the backup cooling system may be blocked by the impurities, and as a result, the bearings of the pump may not be cooled.

Therefore, an object of the present invention is to provide a pump device provided with a backup cooling system capable of preventing clogging of pipes by impurities.

In order to achieve the above-mentioned object, one aspect of the present invention is a pump device for pumping a liquid from a water tank, which is a suction pipe connected to a main pump and a suction side of the main pump and having a first suction port. A communication pipe that is connected to the bearing of the main pump and has a second suction port, a coolant pump attached to the backup cooling line, and a communication pipe extending between the backup cooling line and the suction pipe. It is characterized by having and.

The communication pipe is characterized in that at least two on-off valves are attached to the communication pipe.
The communication pipe is provided with a check valve for preventing the backflow of liquid from the suction pipe to the backup cooling line.
The backup cooling line includes a suction line connected to the suction side of the coolant pump and a transfer line connected to the discharge side of the coolant pump, and the communication pipe is connected to the suction line. It is characterized by being.
The second suction port is characterized in that it is composed of a foot valve.
A strainer is attached to the backup cooling line.
A bearing cooling system for supplying fresh water to the bearing to cool the bearing is further provided.

When the main pump is operated, the liquid in the water tank is pumped up through the suction pipe, and the liquid in the water tank is sucked into the main pump from the second suction port through the communication pipe due to the negative pressure generated accordingly. The contaminants accumulated near the second suction port of the backup cooling line are sucked into the main pump together with the liquid, and as a result, the contaminants can be removed from the periphery of the second suction port. When the bearings are cooled using the backup cooling system, the liquid in the water tank can be supplied to the bearings through the backup cooling line by driving the coolant pump. Since the contaminants have already been removed from the vicinity of the second suction port of the backup cooling line, it is possible to prevent the backup cooling line from being blocked by the contaminants.

It is a schematic diagram which shows one Embodiment of a pump device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of a pump device. This pump device is a device for pumping liquid (for example, water drawn from a river or a lake) in the water tank 1. As shown in FIG. 1, the pump device includes a main pump 5 for pumping liquid, a suction pipe 6 connected to the suction side of the main pump 5, and a discharge pipe 9 connected to the discharge side of the main pump 5. Is equipped with. The suction pipe 6 has a first suction port 7, and the first suction port 7 is located in the water tank 1. The discharge pipe 9 is provided with a check valve 12 and a discharge valve 14.

The main pump 5 and the discharge pipe 9 are installed outside the water tank 1. The main pump 5 includes a pump casing 15, a rotating shaft 18, an impeller 20 fixed to the rotating shaft 18, and a bearing 21 that supports the rotating shaft 18. In this embodiment, the rotating shaft 18 is supported by at least two bearings 21. The impeller 20 is arranged in the pump casing 15. The rotating shaft 18 is connected to a drive source (not shown) such as an electric motor or an engine, and the impeller 20 and the rotating shaft 18 are configured to be integrally rotated by the drive source.

A vacuum pump 22 is connected to the upper part of the pump casing 15. When the vacuum pump 22 is operated with the discharge valve 14 closed, a negative pressure is formed in the pump casing 15, and the liquid in the water tank 1 is sucked into the pump casing 15 through the suction pipe 6 by this negative pressure. The inside of the pump casing 15 is filled with a liquid. When the drive source rotates the rotating shaft 18 and the impeller 20 while the inside of the pump casing 15 is filled with the liquid, the main pump 5 can pump the liquid in the water tank 1 through the suction pipe 6. The discharge valve 14 is opened at the same time as or immediately after the impeller 20 starts rotating. The liquid pumped by the main pump 5 is transferred to another place through the discharge pipe 9.

The pump device includes a bearing cooling system 30 that supplies fresh water as a cooling liquid to the bearing 21 of the main pump 5. In the bearing cooling system 30, fresh water supplied from a fresh water supply source 35 (for example, a pressurized water utility or the like) other than the water tank 1 is used as a cooling liquid for cooling the bearing 21. The fresh water may be pure water. The bearing cooling system 30 includes a coolant supply line 31 for supplying fresh water to the bearing 21, and a coolant discharge line 32 for discharging the fresh water supplied to the bearing 21. One end of the coolant supply line 31 is connected to the fresh water supply source 35, and the other end of the coolant supply line 31 is connected to the bearing 21. One end of the coolant discharge line 32 is connected to the bearing 21, and the other end of the coolant discharge line 32 is located in the water tank 1 or above the water tank 1.

A check valve 36 is attached to the coolant supply line 31 in order to prevent backflow of fresh water to the fresh water supply source 35. The fresh water as the coolant is supplied to the bearing 21 through the coolant supply line 31 and cools the bearing 21 by directly or indirectly contacting the bearing 21. The fresh water supplied to the bearing 21 is discharged into the water tank 1 through the coolant discharge line 32. During the operation of the main pump 5, fresh water is always supplied to the bearing 21 to cool the bearing 21.

The pump device further includes a backup cooling system 40 that cools the bearing 21 in place of the bearing cooling system 30 when the bearing cooling system 30 described above does not function properly. The backup cooling system 40 includes a backup cooling line 44 having a second suction port 42, a coolant pump 47 provided in the backup cooling line 44, and a communication pipe 50 extending between the backup cooling line 44 and the suction pipe 6. And have.

The second suction port 42 is located in the water tank 1. In the present embodiment, the first suction port 7 and the second suction port 42 are located at substantially the same height, but in one embodiment, the second suction port 42 has a height different from that of the first suction port 7. It may be located. In the present embodiment, the second suction port 42 is composed of a foot valve. The foot valve is a check valve capable of preventing the backflow of the liquid flowing into the backup cooling line 44. That is, the liquid once flowing into the backup cooling line 44 is held by the foot valve.

The backup cooling line 44 includes a suction line 44a connected to the suction side of the coolant pump 47 and a transfer line 44b connected to the discharge side of the coolant pump 47. The communication pipe 50 is connected to the suction line 44a. The suction line 44a of the backup cooling line 44 communicates with the suction pipe 6 through the communication pipe 50. The transfer line 44b extends from the coolant pump 47 to the bearing 21 of the main pump 5. In the present embodiment, a part of the transfer line 44b constitutes a part of the coolant supply line 31. In one embodiment, the transfer line 44b may be completely separated from the coolant supply line 31.

A check valve 61 and a strainer 62 are attached to the transfer line 44b. The check valve 61 can prevent the backflow of liquid from the bearing 21 to the coolant pump 47. The strainer 62 is a filter for removing solid matter contained in the liquid. In this embodiment, the strainer 62 is arranged downstream of the check valve 61.

When the main pump 5 is operated, the liquid in the water tank 1 is sucked from the first suction port 7, passes through the suction pipe 6 and the main pump 5, and is discharged to the discharge pipe 9. At this time, a negative pressure is formed in the communication pipe 50 by the liquid flowing through the suction pipe 6. Therefore, the liquid in the water tank 1 is sucked from the second suction port 42, passes through the suction line 44a, the communication pipe 50, and the main pump 5, and is discharged to the discharge pipe 9.

In this way, as the main pump 5 operates, the liquid in the water tank 1 is sucked from the second suction port 42. Dirt such as mud and sand accumulated around the second suction port 42 is sucked together with the liquid from the second suction port 42 into the suction line 44a of the backup cooling line 44, and further passes through the communication pipe 50 and the main pump 5. Is discharged to the discharge pipe 9. As a result, impurities can be removed from the vicinity of the second suction port 42 of the backup cooling line 44. Further, since the second suction port 42 composed of the foot valve opens with the inflow of the liquid, it is possible to prevent the foot valve from sticking due to long-term closure.

When the bearing 21 is cooled by using the backup cooling system 40, the liquid in the water tank 1 can be supplied to the bearing 21 through the backup cooling line 44 by driving the coolant pump 47. Since no contaminants are present in the vicinity of the second suction port 42 of the backup cooling line 44, it is possible to prevent the backup cooling line 44 from being blocked by the contaminants.

A check valve 70 is attached to the communication pipe 50 to prevent the backflow of liquid from the suction pipe 6 to the backup cooling line 44. The check valve 70 can prevent impurities in the liquid sucked through the suction pipe 6 from being sent to the backup cooling line 44. Further, two on-off valves 71 are attached to the communication pipe 50. More than two on-off valves 71 may be attached to the communication pipe 50. In the present embodiment, the two on-off valves 71 are arranged in the vicinity of both ends of the communication pipe 50, respectively. These on-off valves 71 are normally open. If the communication pipe 50 is damaged or damaged, neither the main pump 5 nor the coolant pump 47 can operate normally. Therefore, when the communication pipe 50 is damaged or damaged, the operation of the main pump 5 and the coolant pump 47 can be continued by closing the on-off valve 71.

The above-described embodiment is described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally performed by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is construed in the broadest range according to the technical idea defined by the claims.

1 Water tank 5 Main pump 6 Suction pipe 7 1st suction port 9 Discharge pipe 12 Check valve 14 Discharge valve 15 Pump casing 18 Rotating shaft 20 Impeller 21 Bearing 22 Vacuum pump 30 Bearing cooling system 31 Coolant supply line 32 Coolant discharge Line 35 Fresh water supply source 36 Check valve 40 Check valve 40 Backup cooling system 42 Second suction port 44 Backup cooling line 44a Suction line 44b Transfer line 47 Coolant pump 50 Communication pipe 61 Check valve 62 Strainer 70 Check valve 71 On-off valve

Claims (7)

A pump device for pumping liquid from an aquarium
With the main pump
A suction pipe connected to the suction side of the main pump and having a first suction port,
A backup cooling line connected to the bearing of the main pump and having a second suction port,
A coolant pump attached to the backup cooling line,
A pump device including a communication pipe extending between the backup cooling line and the suction pipe. The pump device according to claim 1, wherein at least two on-off valves are attached to the communication pipe. The pump device according to claim 1 or 2, wherein the communication pipe is provided with a check valve for preventing backflow of liquid from the suction pipe to the backup cooling line. The backup cooling line includes a suction line connected to the suction side of the coolant pump and a transfer line connected to the discharge side of the coolant pump.
The pump device according to any one of claims 1 to 3, wherein the communication pipe is connected to the suction line. The pump device according to any one of claims 1 to 4, wherein the second suction port is composed of a foot valve. The pump device according to any one of claims 1 to 5, wherein a strainer is attached to the backup cooling line. The pump device according to any one of claims 1 to 6, further comprising a bearing cooling system for supplying fresh water to the bearing to cool the bearing.

Images