JPH04103287U - centrifugal pump - Google Patents

Abstract

(57) [Summary] [Purpose] When a centrifugal pump pumps a liquid containing dissolved gas, the vacuum pump for discharging the gas separated from the liquid sucks in solids and breaks down, causing the centrifugal pump to vibrate and become unable to pump water. To prevent such troubles from occurring. [Structure] The centrifugal pump is equipped with an ejector 15 for discharging the gas separated from the liquid, and a blower 17 for supplying ejecting air to the ejector 15 to ensure reliable discharge of the gas and stable operation. I do.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea also relates to a centrifugal pump for pumping liquids containing large amounts of dissolved gas. It is.

0002

[Conventional technology]

When a liquid containing a large amount of dissolved gas is pumped using a centrifugal pump, the gas dissolved in the liquid may The gas separates from the liquid and accumulates at the impeller blade inlet, resulting in pumping action. This is known to cause problems such as vibration of the centrifugal pump and inability to pump water. ing. Therefore, conventionally, a vacuum pump was installed behind the impeller of the centrifugal pump. A remote control device configured to suck in the gas separated from the liquid using a vacuum pump and exhaust it to the outside. A heart pump was used (see JP-A-64-24197).

0003

[Problem that the idea aims to solve]

However, when such a centrifugal pump sucks gas separated from a liquid, it uses a vacuum port. If the pump sucks in not only the gas but also the solids contained in the liquid and malfunctions, the gas cannot be discharged. This may cause the centrifugal pump to vibrate or become unable to pump water. This idea solves this problem with centrifugal pumps that forcefully pump liquids containing dissolved gases. The separated gas can be evacuated without passing through a vacuum pump. , prevents vacuum pump failure and centrifugal pump trouble due to solids in the liquid and stabilizes The purpose of the present invention is to provide a centrifugal pump that can be operated at high speeds.

0004

[Means to solve the problem]

In this design, a centrifugal pump that pumps liquid containing dissolved gas is used to separate gas from the liquid. An ejector for discharging gas and supplying air for ejection to this ejector. A blower is installed. The eject air pressurized from the blower is ejected. When the gas is separated from the liquid by the action of the ejector, it is sent to the centrifugal pump. is discharged to the outside.

[0005]

【Example】

FIG. 1 is a longitudinal sectional view showing the configuration of a centrifugal pump that is an embodiment of this invention. Here, the pump body 1 includes a casing 2, an impeller 3, and the impeller 3 at the front end. It consists of an attached drive shaft 4, a bearing 5 that supports the drive shaft 4, and a shaft seal 6. .

[0006] The impeller 3 includes blades 8 and a back blade 10 that decompresses the rear part 9 of the impeller 3, and an impeller 3. A passage hole 12 communicating between the front part 11 and the rear part 9 of the propeller 3 is provided. K The thing 2 is provided with a gas passage 16 whose one end opens to the rear part 9 of the impeller 3. An ejector 15 is attached to the other end of this gas 16. Also, bearing A blower 17 is provided behind the ejector 1. A blower pipe 24 is connected to 5. The blower impeller 14 of the blower 17 is connected to the drive shaft 4. Fixed. A suction pipe 20 is connected to the suction port 18 of this centrifugal pump from the water tank 19. A discharge pipe 22 is connected to the discharge port 21.

[0007] The rear end of the drive shaft 4 is connected to a motor (not shown), and the rotation of this motor causes the The drive shaft 4 rotates the impeller 3 and the blower impeller 14. Impeller 3 rotates Then, the liquid 23 containing dissolved gas stored in the water tank 19 passes through the suction pipe 20. is sucked in from the suction port 18, pressurized by the impeller 3, and discharged from the discharge port 21 through the discharge pipe 2. 2.

[0008] At this time, the pressure of the liquid 23 decreases from the water tank 19 to the impeller 3. , energy is given by the blades 8 of the impeller 3 and the pressure rises to a predetermined value. Therefore, the gas dissolved in the liquid 23 decreases in pressure until it reaches the blade 8. It separates from the liquid 23 and accumulates in the front part 11 of the impeller 3. The back blade 9 of the impeller 3 is , the accumulated gas is used to depressurize the rear part 9 of the impeller 3 and make it lower than the front part 11. The gas passes through the passage hole 12 and moves to the rear part 11. As mentioned above, at the same time as the impeller 3 rotates, the blower impeller 14 of the blower 17 also rotates. Because of the rotation, from the blower 17, the air for ejecting is boosted by the blower impeller 14. The air is sent to the ejector 15 through the blast pipe 24. Therefore, it is moved to the rear part 11. The moved gas is sucked by the action of the ejector 15 and passes through the gas passage 16 to the outside. is discharged to.

[0009]

[Effect of the idea]

This centrifugal pump uses an ejector to pump gas separated from a liquid into a vacuum pump. Since the liquid is discharged without passing through the liquid, solids in the liquid may cause damage to the vacuum pump or cause damage to the centrifugal pump. It is possible to prevent troubles and ensure stable operation.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a centrifugal pump that is an embodiment of this invention.

[Explanation of symbols]

1 Pump body 2 Casing 3 impeller 4 Drive shaft 5 Bearing 6 Shaft seal part 8 Feathers 10 Back feather 12 Passing hole 14 Blower impeller 15 Ejector 16 Gas passage 17 Blower 19 Water tank 23 Liquid

Claims (1)

[Scope of utility model registration request] 1. A centrifugal pump for pumping a liquid containing dissolved gas, characterized by comprising an ejector for discharging gas separated from the liquid, and a blower for supplying ejecting air to the ejector. centrifugal pump.