CN-121976955-A - Liquid metal pump and rotor axial force balancing method thereof

Abstract

The invention relates to the field of conveying pumps, in particular to a liquid metal pump and a rotor axial force balancing method thereof, wherein the liquid metal pump comprises a pump body, a pump shaft and an impeller, the pump body comprises a pump body, a liquid inlet section and guide vanes which are sequentially connected, the liquid inlet section comprises a plurality of overflow channels, a partition mechanism for partitioning the pump body and the liquid inlet section is arranged above the overflow channels, the partition mechanism comprises a balancing drum and a partition member, the balancing drum is connected with the pump shaft, the partition member is connected with the pump body and is in sealing and rotating connection with the partition member, a high-pressure cavity is formed between the balancing drum and the partition member, the position of the impeller is communicated with the high-pressure cavity, after liquid metal enters the liquid metal pump, part of liquid metal enters the high-pressure cavity, the upper end face of the balancing drum is a high-pressure area, the lower end face of the balancing drum is a low-pressure area, and the balancing drum can generate opposite axial force with the impeller to offset part of the axial force. By adopting the technical scheme, the vortex generated in the cylinder during the operation of the pump is reduced, and the operation load of the thrust bearing is reduced.

Inventors

• HU DONGDONG
• MA WENSHENG
• YU GUANGBIN
• Rulafkov Mikhail

Assignees

• 重庆水泵厂有限责任公司

Dates

Publication Date

20260505

Application Date

20260205

Claims (8)

1. 1. The liquid metal pump is characterized by comprising a pump cylinder body, a pump shaft and an impeller, wherein the pump cylinder body comprises a pump body, a liquid inlet section and guide vanes which are sequentially connected, the liquid inlet section comprises a plurality of overflow flow channels distributed along the radial circumference of the liquid inlet section, the pump shaft is positioned in the pump cylinder body, the impeller is connected with the pump shaft, a partition mechanism for partitioning the pump body and the liquid inlet section is arranged above the overflow flow channels, the partition mechanism comprises a balance drum and a partition member, the balance drum is connected with the pump shaft, the partition member is connected with the pump body, the balance drum is in sealing rotation connection with the partition member, a high-pressure cavity is formed between the balance drum and the partition member, and the position of the impeller is communicated with the high-pressure cavity.
2. 2. The liquid metal pump of claim 1, wherein the liquid inlet section further comprises a rectifying rib, and adjacent overflow channels are separated by the rectifying rib.
3. 3. The liquid metal pump according to claim 2, wherein the rectification rib plate is provided with a built-in pressure guiding hole, and the position of the impeller is communicated with the high-pressure cavity through the built-in pressure guiding hole.
4. 4. The liquid metal pump of claim 3, wherein the flow passage is arcuate.
5. 5. The liquid metal pump of claim 4, wherein the partition member is a seal ring or a guide bearing.
6. 6. The liquid metal pump of claim 5, wherein an annular cavity is formed between the guide vane and the liquid inlet section at the position of the impeller, and the lower end of the built-in pressure guiding hole is bent and communicated with the annular cavity.
7. 7. A method for balancing axial force of a liquid metal pump rotor is characterized in that after liquid metal enters the liquid metal pump according to any one of claims 1-6, part of the liquid metal enters a high-pressure cavity, the upper end face of a balancing drum is a high-pressure area, the lower end face of the balancing drum is a low-pressure area, and the balancing drum can generate axial force opposite to an impeller so as to offset part of the axial force of the impeller.
8. 8. The method of axial force balancing of a liquid metal pump rotor of claim 7, wherein the diameter of the balancing drum is adjustable.

Description

Liquid metal pump and rotor axial force balancing method thereof Technical Field The invention relates to the field of delivery pumps, in particular to a liquid metal pump and a rotor axial force balancing method thereof. Background The liquid metal is a core cooling medium for realizing heat conduction because of excellent high-temperature heat conductivity, neutron compatibility and chemical stability, and the stable conveying of the liquid metal directly determines the service life of a liquid metal pump and the heat exchange efficiency and operation safety of a system acted by the liquid metal. The liquid metal pump is arranged on the top cover of the pool type container, the lower part of the pool type container is liquid metal, the upper part of the pool type container is a gas covering space, the pump cylinder body is arranged in the pool type container through a top cover opening, a hydraulic component of the liquid metal pump is arranged below the free liquid level of the liquid metal, a pump inlet is formed by upper radial suction, the pump outlet is axially discharged from the lower part, the problem of vortex in the cylinder can be generated when the liquid metal pump operates, meanwhile, because the density of the liquid metal is generally higher, a high-density medium can generate higher axial force on a pump rotor after being pressurized by an impeller, the axial force of the impeller is a main component of the axial force of the rotor, for example, the density of the liquid lead bismuth alloy is about 10 times of that of water, and the axial force of the liquid lead bismuth alloy on the pump rotor is about 10 times of that of water under the same pump lift. The high axial forces from the delivery of high density liquid metal can greatly increase the operating load of the pump thrust bearing. Disclosure of Invention The present invention aims to provide a liquid metal pump to reduce the vortexes generated in the barrel when the pump is operated and to reduce the operation load of the thrust bearing. The liquid metal pump comprises a pump body, a pump shaft and an impeller, wherein the pump body comprises a pump body, a liquid inlet section and guide vanes which are sequentially connected, the liquid inlet section comprises a plurality of overflow channels distributed along the radial circumference of the liquid inlet section, the pump shaft is positioned in the pump body, the impeller is connected with the pump shaft, a partition mechanism for partitioning the pump body and the liquid inlet section is arranged above the overflow channels, the partition mechanism comprises a balance drum and a partition member, the balance drum is connected with the pump shaft, the partition member is connected with the pump body, the balance drum is in sealing rotation connection with the partition member, a high-pressure cavity is formed between the balance drum and the partition member, and the position of the impeller is communicated with the high-pressure cavity. The hydraulic pump has the advantages that through the arrangement design of hydraulic components such as the water inlet section, the impeller, the guide vanes and the like, the hydraulic pump is compact in structure and convenient to arrange, fluid can be evenly and smoothly sucked from the upper water inlet section sideways and is axially discharged through the guide vanes after being pressurized by the impeller, the arrangement requirement of an inlet and outlet interface of a use scene is met, meanwhile, an overflow flow passage, namely a pump inlet, is arranged at the lower half section of a pump cylinder body and close to the position of an outlet of the pump, is far away from a free liquid level, the risk of suction surge of the pump caused by the falling of the free liquid level to the pump inlet is avoided, in addition, the in-cylinder vortex generated during operation of the pump is effectively prevented by the arrangement of a partition mechanism, in addition, the position of the impeller is communicated with a high-pressure cavity, high-pressure medium at the outlet of the impeller is led to the upper end face of a balance drum, and the axial forces generated by two opposite high pressures are mutually offset or subtracted, so that the axial forces at the impeller part or most are offset, the purpose of the axial forces of the impeller is achieved, the purposes of reducing the axial forces of a rotor are further, the operation load of a thrust bearing is reduced, and the service life of the thrust bearing is prolonged. Further, the liquid inlet section further comprises a rectifying rib plate, and adjacent overcurrent channels are separated by the rectifying rib plate. The pump has the beneficial effects that the pump is beneficial to preventing the generation of the external vortex of the cylinder when in operation, the damage caused by cavitation is avoided firstly by overcoming the external vortex of the cylinder, the service life