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Semi-open type centrifugal compressor axial thrust balancing method

A centrifugal compressor and axial thrust technology, which is applied in mechanical equipment, non-variable pumps, machines/engines, etc., can solve the problems of unbalanced axial force of the impeller, short service life, large space occupation, etc. The effect of high reliability, accurate numerical value and small space occupation

Inactive Publication Date: 2020-09-29
辽宁福鞍燃气轮机有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional calculation method of the axial force of the compressor only focuses on the calculation of the axial force of the closed impeller, and directly brings the calculation method into the semi-open impeller. For the centrifugal compressor, due to the different structure of the impeller, the impeller boost Finally, there will be a large pressure difference between the front and back of the impeller disc, which will also generate a large axial thrust. Therefore, the traditional calculation method has a large error. The axial forces in the two directions of the impeller cannot be balanced, and the thrust will Applying one side will cause too much axial force on one side of the impeller; in order to balance the axial thrust, three methods are currently used to install thrust bearings, balance drums or balance discs, all of which have high costs. , Take up a lot of space and short service life

Method used

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  • Semi-open type centrifugal compressor axial thrust balancing method
  • Semi-open type centrifugal compressor axial thrust balancing method
  • Semi-open type centrifugal compressor axial thrust balancing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The specific implementation steps are as follows: (a) According to F inlet , F imp , F disk Calculate the axial thrust of the impeller with the given formula method; (b) calculate and determine the average static pressure or pressure distribution of the cavity structure on the back of the impeller; (c) calculate the relative installation radius R of the sealing plate 4 according to the formula x (d) determine the number of sealing teeth; (e) determine the sealing gap.

[0025] Formula 1: F inlet =P 0 ×πR 1 2 ;

[0026] Formula two:

[0027] Formula three: and its simplified formula F disk = π(R 4 2 -R 3 2 )×P 2 , at this time, F disk = π(R 4 2 -R x 2 )×P 2+ f disk = π(R x 2 -R 3 2 )×P 3 ;

[0028] Formula 4: F=F inlet +F imp +F disk , F is equal to 0.

Embodiment 2

[0030] A case of axial thrust balance of a compressor impeller is provided. The sealing sheet 4 can be composed of three copper sealing sheets. The copper sealing sheet 4 controls the air pressure distribution in the cavity at the back of the impeller, so as to realize back thrust control, and then realize the overall Axial thrust control. In theory, the axial force thrust can be completely offset.

Embodiment 3

[0032] combine image 3 As shown, the present invention recommends that the gap between the top of the tooth of the sealing plate 4 and the back plate of the impeller be controlled at about 0.3 mm. After calculation, the gap between the top of the tooth of the sealing plate 4 and the back plate of the impeller is controlled at 0.2 to 0.9 mm. Sealing requirements, the number of sealing sheets 4 can be multiple, the number of sealing sheets 4 is recommended to be no less than 3, and the number of sealing sheets 4 is suggested but not limited to 3 to 6 pieces. combine Figure 4 As shown, the present invention recommends that the thickness D of the sealing sheet 4 be 1.5-3.5 mm, and the tooth height H is determined by the height of the cavity at the back of the impeller, so as to ensure that the tooth tip clearance of the sealing sheet 4 is about 0.3 mm. The tooth profile angle α of the sealing sheet 4 should be between 15° and 25°, and the tooth top width L of the sealing sheet ...

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Abstract

The invention belongs to the technical field of turbine machinery and specifically relates to a semi-open type centrifugal compressor axial thrust balancing method. A semi-open type centrifugal compressor comprises an impeller inlet end, a reinforced section and a wheel disk. A sealing sheet is arranged on the wheel disk. The outer diameter Rx of the sealing sheet is located on the wheel disk. Thedirection of the impeller inlet end Finlet and the direction of the axial force of the reinforced section Fimp are the same. The direction of the wheel disk Fdisk is opposite to the direction of theimpeller inlet end Finlet and the direction of the axial force of the reinforced section Fimp. The wheel disk Fdisk, the impeller inlet end Finlet and the axial force of the reinforced section Fimp are added in sequence to generate axial thrust resultant force. F represents the axial thrust resultant force. When F is equal to zero, the axial force is balanced. According to the semi-open type centrifugal impeller axial thrust calculation method, based on iteration of pressure distribution integrals and momentum change conversion, the accurate axial thrust of a centrifugal impeller is calculated, and the accuracy degree of the calculated axial thrust is high; and the axial force can be obtained through calculation of the axial thrust and determination of the position Rx of the sealing sheet,the axial force is balanced through F=0, and the applicability is very high.

Description

technical field [0001] The invention belongs to the technical field of turbo machinery and relates to a semi-open centrifugal compressor, in particular to a method for balancing the axial thrust of a semi-open centrifugal compressor. Background technique [0002] Centrifugal compressors are widely used in the industrial field. During the operation of centrifugal compressors, the balance of axial thrust is a very important issue. The traditional calculation method of the axial force of the compressor only focuses on the calculation of the axial force of the closed impeller, and directly brings the calculation method into the semi-open impeller. For the centrifugal compressor, due to the different structure of the impeller, the impeller boost Finally, there will be a large pressure difference between the front and back of the impeller disc, which will also generate a large axial thrust. Therefore, the traditional calculation method has a large error. The axial forces in the tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/051
CPCF04D29/051
Inventor 房骏翌鲍丛张影代琳汪洋徐玮莹
Owner 辽宁福鞍燃气轮机有限公司