Low-temperature in-tank pump without balance mechanism

Abstract

The invention relates to a low-temperature in-tank pump without a balance mechanism. The low-temperature in-tank pump without the balance mechanism comprises a spiral flow guide body, a rotating shaft and an inducer, wherein the spiral flow guide body is of a columnar structure; a cavity is arranged in the spiral flow guide body and is configured to accommodate a first-stage impeller and a secondary impeller; blades of the first-stage impeller and blades of the secondary impeller are arranged back to back; a first through hole and a plurality of overflow channels are further formed in the spiral flow guide body; the cavity is in fluid communication connection with the overflow channels; the rotating shaft penetrates through the first through hole; the first-stage impeller and the secondary impeller are annularly arranged on the rotating shaft in a sleeving mode; the first end of the rotating shaft is fixedly connected with a motor; the second end of the rotating shaft is a free end; and the inducer is annularly arranged at the second end of the rotating shaft in a sleeving mode and is configured to induce fluid to enter the spiral flow guide body. According to the low-temperature in-tank pump without the balance mechanism provided by the invention, the device is free of the balance mechanism, has the advantages of few friction pairs, simple bearing positioning and the like, is more suitable for conveying low-temperature easy-to-gasify media, and can be beneficial to greatly reducing the clamping stagnation risk of a pump rotor.

Description

Technical field[0001]The present invention relates to a low temperature tank of a balanced mechanism, belonging to a low temperature pump technology.Background technique[0002]There is a balance mechanism in the low temperature tank currently used, and the balancing mechanism uses a balance drum or a balanced disk, or the combination of the two. The principle of the balance mechanism is to balance the impeller axial force by using the pressure difference between the hydraulic pressure and the effect area.[0003]The establishment of the axial force balance is based on the direction of centrifugal pump, but the row of the center of the center changes with the flow rate, when the working point changes, the balanced position needs to be re-established, the balance mechanism gap will change, that is, the pump rotor will produce Make up. When the working condition changes quickly or starts and stops, the balance mechanism will inevitably produce grinding from the stationary parts due to ine...

AI Technical Summary

Problems solved by technology

The increase of dynamic and static friction pairs in the rotor system will bring the risk of rotor sticking and locking

[0005] In addition, the medium conveyed by the pump in the low-temperature tank is a low-temperature and easy-to-gasify medium. When the pump is operating under abnormal conditions and part of the medium is gasified, it will cause pressure drop changes and make the balance mechanism unbalanced, resulting in dynamic and static contact of the balance parts, prompting shutdown and failure of the pump. damage

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