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Multi-stage pump flow-induced vibration suppression device

A technology of vibration suppression and pump flow, which is applied to the components, pumps, and pump components of the pumping device for elastic fluids, which can solve the problems of affecting the impeller pulsation frequency, etc., to facilitate processing, reduce high-frequency pressure pulsation, increase The effect of stability

Pending Publication Date: 2019-12-03
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure water chamber of segmental multistage pump is generally guide vane type, and the radial force of guide vane type pressure water chamber is small in theory, but due to the existence of the water outlet section, a certain radial force will be generated; while the multistage The fluid in the final stage of the pump has a high energy head, and the high-frequency pulsation at the outlet of the guide vane in the final stage directly affects the pulsation frequency of the entire impeller

Method used

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  • Multi-stage pump flow-induced vibration suppression device
  • Multi-stage pump flow-induced vibration suppression device
  • Multi-stage pump flow-induced vibration suppression device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] like figure 1 , 2 As shown, a multi-stage pump flow-induced vibration suppression device of the present invention includes a multi-stage centrifugal pump, mainly composed of an impeller group, a guide vane group, a guide vane outlet gland group, and a shaft; the impeller group and the shaft are fixed, and the shaft rotation;

[0025] A guide vane outlet gland group is installed at the outlet of the guide vane group, and the diameter of the impeller group is close to the inner diameter of the guide vane outlet gland group;

[0026] The impeller group includes a primary impeller 1, a secondary impeller 2, and a final impeller 10, and the primary impeller 1, secondary impeller 2, and final impeller 10 are sequentially fixed together;

[0027] The guide vane group includes primary guide vanes, secondary guide vanes 3, and final guide vanes 4;

[0028] An outlet gland 6 is installed at the outlet of the last-stage guide vane 4 of the multistage centrifugal pump, and an an...

Embodiment 2

[0039] Project source: P101B pump of methyl ethyl ketone plant in a petrochemical company additive factory in Lanzhou, the design medium is butene; use Jitai portable TV200 vibrometer to measure the amplitude range;

[0040] like Figure 1-5 As shown, a multi-stage pump flow-induced vibration suppression device of the present invention, such as embodiment 1,

[0041] The inlet placement angle of the final guide vane 4: 15°; the outlet placement angle: 11°; the number of final guide vane blades: 10;

[0042] The cylindrical channel n 3 is the number of cylindrical channels, n 3 =24.

[0043] The gap b between the outlet gland 6 and the diameter of the outlet base circle of the final stage guide 4 1 1mm.

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Abstract

The invention discloses a multi-stage pump flow-induced vibration suppression device. According to the structure of the multistage pump flow-induced vibration suppression device, an annular flow channel is formed in the inner wall of an outlet gland. According to the structure, the middle section of the pump shell and the last-stage guide vane are fixed on the pump shell through bolts to bear partof impact force of high-pressure fluid on the pump shell; an annular flow channel is formed in the inner wall of the outlet gland and used for redistributing the pressure of liquid flowing out of thehigh-pressure end, radial force is further balanced, high-frequency vibration of high-energy fluid is converted into low-frequency vibration, energy is concentrated on the outlet gland fixed to the pump shell, and therefore vibration of the multistage pump rotor is reduced, and the operation stability of the multistage pump is improved.

Description

technical field [0001] The invention belongs to the technical field of centrifugal pumps, in particular to a double-casing multistage centrifugal pump under high temperature and high pressure working conditions, in particular to a flow-induced vibration suppression device for multistage pumps. Background technique [0002] Segmental multistage pumps are widely used in petrochemical, agricultural, mining and other fields due to their compact structure and the same shape and size of each middle section (and guide vanes) for easy casting. The pressurized water chamber of the segmental multistage pump is generally of the guide vane type. The guide vane type pressurized water chamber has a small radial force in theory, but due to the existence of the water outlet section, a certain radial force will be generated; The fluid in the final stage of the pump has a high energy head, and the high-frequency pulsation at the outlet of the final guide vane directly affects the pulsation fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D1/06F04D29/44F04D29/42F04D29/22F04D29/66
CPCF04D1/06F04D29/445F04D29/426F04D29/22F04D29/669
Inventor 杨从新钱晨王书涛陈红蕾
Owner LANZHOU UNIVERSITY OF TECHNOLOGY