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Multistage centrifugal compressor

A technology of centrifugal compressors and diffusers, which is applied to mechanical equipment, non-variable pumps, non-displacement pumps, etc., and can solve the problems of increased friction loss, increased average speed, and reduced efficiency of diffusers

Active Publication Date: 2014-02-05
SHENYANG SITE MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the diffuser's flow path height decreases, its average velocity increases, and friction losses in the diffuser increase, making it less efficient
In this way, although the efficiency of the vaneless diffuser is low, it has better adaptability to the working conditions. Moreover, when the absolute speed of the impeller outlet reaches supersonic speed, as long as the radial partial velocity is less than the speed of sound, the vaneless diffuser There is still no shock wave in the device, at this time it can reduce the supersonic airflow to subsonic airflow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 Multistage centrifugal compressor with backward curved blades

[0033] This embodiment is a three-stage centrifugal compressor, the impeller adopts an open impeller, and its blades adopt a backward curved structure, and the blades of the front and rear impellers are deflected by 5 degrees; The device is configured on the side of the high-voltage stage. The rest of the inlet port with adjustable guide vane angle, the inlet and outlet volute with ribs on both sides of the outlet partition, the inlet and outlet volute with ribs on both sides of the outlet partition, the structure of the gas seal and the oil seal group are all the same as before mentioned, no further explanation is required.

Embodiment 2

[0034] Embodiment 2 Multistage centrifugal compressor with backward curved blades

[0035] This embodiment is a five-stage centrifugal compressor. The impeller adopts a semi-open impeller, and its blades adopt a backward curved structure. The blades of the front and rear impellers are deflected by 15 degrees; After the vane diffuser, a vane diffuser is arranged. The rest of the inlet port with adjustable guide vane angle, the inlet and outlet volute with ribs on both sides of the outlet partition, the inlet and outlet volute with ribs on both sides of the outlet partition, the structure of the gas seal and the oil seal group are all the same as before mentioned, no further explanation is required.

Embodiment 3

[0036] Embodiment 3 Multistage centrifugal compressor with backward curved blades

[0037] This embodiment is a four-stage centrifugal compressor, the impeller adopts a closed impeller, and its blades adopt a backward curved structure, and the blades of the front and rear impellers are deflected by 10 degrees; After the diffuser, a vane diffuser is arranged. The rest of the inlet port with adjustable guide vane angle, the inlet and outlet volute with ribs on both sides of the outlet partition, the inlet and outlet volute with ribs on both sides of the outlet partition, the structure of the gas seal and the oil seal group are all the same as before mentioned, no further explanation is required.

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Abstract

A multistage centrifugal compressor comprises a spindle, impellers, a spacer bush, a thrust disc, a balance disc, a diaphragm coupling, a curve, a backflow device, a diffuser, an inlet and outlet volute chamber and a seal and is characterized in that the compressor is provided with multiple cascade-stage impellers, vanes of the rear impeller of every two adjacent impellers deflects for certain angles relative to vanes of the front impeller of every two adjacent impellers; the diffuser adopts combination of a vaneless diffuser and a vane diffuser, the vaneless diffuser is in front of the vane diffuser; an air inlet way composed of an inner ring, an outer ring, a side plate and adjustable guide vanes is adopted; the inlet and outlet volute chamber provided with reinforcing ribs on two sides of a partition plate is adopted; an air seal body is sealed in a split mode and assembled integrally; an oil seal group structure provided with a certain-taper oblique plane on the inner wall of a seal ring is adopted. The multistage centrifugal compressor can stably work in a wide working range, can be well suitable for various different working environments and working media and wins consistent high praise from customers.

Description

technical field [0001] The invention belongs to the technical field of radial flow compressors, and in particular relates to a multistage gas compressor with the same axis. Background technique [0002] In a centrifugal compressor, the main components are the working wheel (impeller) and the diffuser that matches it. The air has a lot of kinetic energy after flowing out of the impeller. In order to effectively use this part of energy, a diffuser is installed behind the impeller. device. Diffusers can generally be divided into vaneless diffusers and vaned diffusers according to their structure, which play a great role in improving the performance of compressors. [0003] Centrifugal compressors with vane diffusers have high efficiency, but their operating range is narrow because of the phenomenon of "spinning shedding" on the final stage side. Once a spinning stall occurs (that is, a rotating stall), it will cause severe vibration of the compressor shaft, making it difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/12F04D29/44F04D29/08F04D29/28
Inventor 石雪松
Owner SHENYANG SITE MACHINERY MFG