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Adjustable self-circulation air injection stability expanding structure and centrifugal compressor with stability expanding structure

A centrifugal compressor and self-circulation technology, which is applied to mechanical equipment, non-variable pumps, machines/engines, etc., can solve problems such as blockage and stall at the same time, and achieve universal applicability, easy processing, and simple structure Effect

Active Publication Date: 2021-02-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the active active control method requires an external jet structure, and cannot take into account both clogging and stalling directions at the same time

Method used

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  • Adjustable self-circulation air injection stability expanding structure and centrifugal compressor with stability expanding structure
  • Adjustable self-circulation air injection stability expanding structure and centrifugal compressor with stability expanding structure
  • Adjustable self-circulation air injection stability expanding structure and centrifugal compressor with stability expanding structure

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] The invention provides an adjustable self-circulation air jet expansion stabilization structure used for the vane diffuser of a centrifugal compressor. In this scheme, a cavity is provided outside the rim of the vane diffuser, and an air injection hole connecting the cavity and the flow channel of the vane diffuser is provided. The three air injection holes form a group. The jet holes are partially connected, so that the flow of the vane diffuser in the flow channel flows into the cavity through one jet hole and then flows back to the vane diffuser through the other jet hole, thereby producing the effect of applying jet flow to the flow field. Since the self-circulation flow of the airflow can be realized in the provided cavity, the present invention refers to it as a self-circulation cavity. It can be seen that this method does not require an exte...

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PUM

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Abstract

The invention discloses an adjustable self-circulation air injection stability expanding structure for a blade diffuser of a centrifugal compressor. The adjustable self-circulation air injection stability expanding structure comprises a self-circulation cavity arranged on the outer side of the rim of the blade diffuser, wherein the self-circulation cavity communicates with a flow channel of the blade diffuser through air injection holes H1, H2 and H3. An adjustable shielding component is arranged in the self-circulation cavity; under the blocking working condition, the shielding component is controlled to enable the air injection hole H1 and the air injection hole H2 to be opened and enable the air injection hole H3 to be blocked; and under the stall working condition, the adjustable shielding component is controlled to enable the air injection hole H1 and the air injection hole H3 to be opened and enable the air injection hole H2 to be blocked. The invention further provides the centrifugal compressor with the stability expanding structure. By means of the adjustable self-circulation air injection stability expanding structure and the centrifugal compressor with the stability expanding structure, flow blocking and flow separation in a flow field of the blade diffuser can be changed, the flow condition in the diffuser is improved, the stable working range of the centrifugal compressor is widened, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of centrifugal compressors, in particular to an adjustable self-circulation air jet expansion structure for a centrifugal compressor vane diffuser and a centrifugal compressor with the expansion structure. Background technique [0002] Diffusers used in centrifugal compressors are mainly divided into vane diffusers and vaneless diffusers. figure 1 It is the internal structure of a centrifugal compressor with a vane diffuser. The centrifugal compressor includes an impeller, a vane diffuser and a volute (not shown), the outlet of the impeller is connected to the vane diffuser, and the vane diffuser is provided with blades ( figure 1 blades in the middle and outer rings). The present invention is aimed at the flow control and expansion stability design of this blade diffuser. [0003] When the centrifugal compressor works, the impeller first acts on the gas to increase the speed and pressure of the gas; then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44F04D29/66F04D29/68
CPCF04D29/444F04D29/667F04D29/684
Inventor 符丽胡晨星杨策耿开贺张成
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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