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Enclosed impeller of centrifugal compressor

A centrifugal compressor, closed impeller technology, applied in mechanical equipment, non-variable capacity pumps, machines/engines, etc., can solve the problems of inability to guarantee the distribution of the outlet angle, difficult blade load adjustment, etc., to improve performance indicators, reduce Effect of Eddy Current Loss

Inactive Publication Date: 2014-05-21
SHENYANG SITE MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They usually use arcs or ellipses to construct the arc shape of the blades, which makes it difficult to adjust the blade load along the flow direction; and cannot ensure a reasonable distribution of the air outlet angle along the radial direction of the air outlet edge of the impeller.

Method used

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  • Enclosed impeller of centrifugal compressor
  • Enclosed impeller of centrifugal compressor
  • Enclosed impeller of centrifugal compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Using 15Cr2Mo1 pearlitic low-alloy heat-resistant steel forgings as blanks, the hub is first processed by a CNC lathe with an outer diameter of 600 mm, and then a blade is processed by a CNC milling machine. The average thickness of the blade is 4 mm; The lathe is used to process the roulette. The size of the roulette is 450 mm. The welding groove is milled out by a milling machine at the position of the roulette corresponding to the end of the blade. When welding, the blade is inserted into the corresponding groove, and then the welding robot is used for argon arc welding. The hub of the blade is welded to the wheel as a whole.

Embodiment 2

[0060] Using FV520B high-strength and high-toughness maraging steel forgings as blanks, first use CNC lathe to process the hub with an outer diameter of 800 mm, and then use CNC milling machine to process the blades. The average thickness of the blade is 8 mm; CNC lathe processes the roulette. The size of the roulette is 570 mm. Use a milling machine to mill out the welding groove at the position of the roulette corresponding to the end of the blade. When welding, insert the blade into the corresponding groove first, and then use the welding robot to argon arc welding. The hub with blades is welded to the wheel as a whole.

Embodiment 3

[0062] Using 15Cr2Mo1 pearlitic low-alloy heat-resistant steel forgings as blanks, the hub is first machined with a CNC lathe, the outer diameter of which is 700 mm, and then the blades are machined with a CNC milling machine. The average thickness of the blades is 6 mm; The lathe is used to process the roulette. The size of the roulette is 498 mm. The welding groove is milled out by a milling machine at the position of the roulette corresponding to the end of the blade. When welding, the blade is inserted into the corresponding groove, and then the welding robot is used for argon arc welding. The hub of the blade is welded to the wheel as a whole.

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Abstract

The invention discloses an enclosed impeller of a centrifugal compressor. The enclosed impeller of the centrifugal compressor comprises blades, hubs and a wheel disc. The enclosed impeller of the centrifugal compressor is characterized in that the blades are of a backward-bending type constant strength structure; the blades and the hubs are integrated, and the blades and the hubs are connected with the wheel disc through a welding structure. The blades are of the constant strength structure, and circumferential thicknesses of the blades are increased gradually from blade tips to blade roots; the hubs and the wheel disc are connected through the welding structure, and the welding structure is completed by adopting the robot automatic control argon arc welding process. In the process of designing the multi-stage compressor, deflection angles between blade faces of the corresponding blades of a front impeller and a back impeller range from minus 5 degrees to minus 15 degrees. The invention further provides an optimum design method for the enclosed impeller of the centrifugal compressor. According to the method, the manufacturing process of the impeller can be automatically completed and controlled through a computer. According to the enclosed impeller, the high pressure ratio and the high efficiency of airflow inside the compressor can be achieved, the eddy loss inside a channel is reduced, and performance indexes of the centrifugal compressor are obviously improved.

Description

Technical field [0001] The invention belongs to the technical field of centrifugal compressor components, and specifically relates to a new type of closed impeller of a centrifugal compressor. Background technique [0002] The impeller is a main component of the centrifugal compressor, which has a decisive influence on the efficiency of the compressor. According to the structure of the impeller, it can be divided into three types: open, semi-open and closed; according to the air intake mode, it can be divided into: single-sided air intake and double-sided air intake; and according to the form of curved blades Divided into: forward bending, radial and backward bending. [0003] Chinese patent CN90224589.9 discloses a "centrifugal ternary impeller". The impeller has ternary twisted blades with short axial span. The blade profile is determined by a specific load distribution law to determine its wheel cover profile and disc profile. , And then formed by smooth connection of straight...

Claims

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Application Information

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IPC IPC(8): F04D29/28F04D29/30G06F17/50
Inventor 石雪松
Owner SHENYANG SITE MACHINERY MFG
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