CN204200674U - The centrifugal-flow compressor casing bleed recirculation structure of variable geometry - Google Patents

Abstract

The purpose of this utility model is to provide a centrifugal compressor case bleed air recirculation structure with variable geometric size, including a volute, a compressor impeller, the compressor impeller is installed in the volute, and the compressor impeller is along its own circumferential direction. The main blade and the splitter blade are respectively installed. There is an annular gas control groove in the volute, and a return ring is fixed in the gas control groove. The return ring and the inner wall of the volute in the left, right and outer directions of the gas control groove Respectively form a return groove, a suction groove, and a return channel. The return groove, the return channel, and the suction groove are connected in sequence. The suction groove is located between the leading edge of the main blade and the leading edge of the splitter blade. A compressor inlet is formed between the parts, and a sliding sleeve is arranged in the compressor inlet to move along it. The utility model can change the return flow rate of the bleed air recirculation structure, so as to achieve the purpose of optimizing the whole working condition of the air compressor.

Description

Centrifugal Compressor Case Bleed Air Recirculation Structure with Variable Geometry

technical field

The utility model relates to an air compressor, in particular to an air compressor of a turbocharger.

Background technique

Centrifugal compressors use bleed air recirculation devices that are widely used in high-pressure ratio centrifugal compressors in advanced turbochargers at home and abroad. Its main function is to broaden the working range of centrifugal compressors and expand their surge margins. As the speed and pressure ratio of the centrifugal compressor increase, its effective working range narrows sharply. After adopting the bleed air recirculation device, when the flow rate of the centrifugal compressor is close to the surge boundary, part of the gas is pumped through the suction groove, and then from the The return hole flows in, so that the working range of the centrifugal compressor is widened and the surge margin is increased.

The return flow rate of the bleed air recirculation channel during the working process has a decisive impact on the expansion of its working range and the increase of the surge margin. Different extraction return flow rates have different effects on the expansion of the working range of centrifugal compressors at different speeds. Impact. The traditional bleed air recirculation device cannot optimize the working range of the centrifugal compressor under all working conditions.

Contents of the invention

The purpose of the utility model is to provide a centrifugal compressor case bleed air recirculation structure with variable geometric dimensions for changing the return flow rate of the bleed air recirculation structure so as to optimize the whole working condition of the compressor.

The purpose of this utility model is achieved in that:

The utility model is a centrifugal compressor case with variable geometric size entrained air recirculation structure, including a volute, a compressor impeller, and the compressor impeller is installed in the volute, and is characterized in that: the compressor impeller is along its own circumferential direction The main blade and the splitter blade are respectively installed. There is an annular gas control groove in the volute, and a return ring is fixed in the gas control groove. Respectively form a return groove, a suction groove, and a return channel. The return groove, the return channel, and the suction groove are connected in sequence. The suction groove is located between the leading edge of the main blade and the leading edge of the splitter blade. A compressor inlet is formed between the parts, and a sliding sleeve is arranged in the compressor inlet to move along it.

The utility model can also include:

1. The sliding sleeve moves in the air inlet of the compressor to realize the full connection, semi-connection and full closure of the return groove and the air inlet of the compressor.

2. A blade diffuser is arranged outside the trailing edge of the main blade and the splitter blade in the volute.

The advantage of the utility model is that: the utility model installs a sliding sleeve at the outlet of the bleed air recirculation channel, the change of the position of the sliding sleeve can change the flow area of the reflux tank outlet, thereby changing the structure of the bleed air recirculation Return flow, in order to achieve the purpose of optimizing the whole working condition of the compressor.

Description of drawings

Fig. 1 is the structure schematic diagram when the reflux groove of the utility model is semi-communicated with the air inlet of the compressor;

Fig. 2 is a structural schematic diagram of the utility model when the backflow tank and the air inlet of the compressor are fully connected;

Fig. 3 is the structure schematic diagram when the reflux groove of the utility model and the air inlet of the compressor are in a closed state;

Fig. 4 is the perspective view of the impeller and the blade of the utility model;

Fig. 5 is a side view of the impeller and the blade of the utility model.

Detailed ways

The utility model is described in more detail below in conjunction with accompanying drawing example:

1-5, the utility model is a novel centrifugal compressor bleed air recirculation structure with variable geometry, including compressor volute, bleed air recirculation channel, compressor inlet channel and inlet sliding sleeve. Its main feature is that the sliding sleeve 1 at the inlet 2 of the compressor can change the size of the outlet 6 of the bleed air recirculation passage backflow tank to change the air return flow of the bleed air recirculation passage. The suction groove 7 of the bleed air recirculation passage is located between the leading edge 3 of the main blade and the leading edge 11 of the splitter blade, the return groove 5 of the bleed air recirculation passage is located outside the outer edge of the main blade, and the sliding sleeve in the compressor inlet passage 1 Installed in the compressor inlet 2, the change of its position can fully open or completely close or open the outlet 5 of the bleed air recirculation channel of the bleed air recirculation channel at any position, so that the bleed air recirculation channel can be adjusted in all working conditions Control the air return flow inside.

The utility model mainly includes a volute of a centrifugal compressor, an air-bleed recirculation channel and a sliding sleeve for controlling the size of the return port. In the simulation and experimental research of compressor bleed air recirculation, it is found that in order to broaden the stable operating range of the compressor and increase the surge margin, the bleed air recirculation should have a larger return flow under high operating conditions, and a larger return flow should be made under low operating conditions. When there is a small return flow.

When the rotational speed and flow rate of the compressor are small, the position of the sliding sleeve 1 moves toward the inner side of the compressor inlet channel 2, so that the flow area at the outlet of the bleed air recirculation channel reflux groove 5 is reduced, and the return flow is reduced; When the engine speed and flow rate are large, the position of the sliding sleeve 1 moves to the outside of the compressor inlet 2, so that the flow area of the bleed air recirculation channel reflux groove 5 is increased, and the return flow is increased; thus, it can be realized , adjust the return flow of the bleed air recirculation channel under all working conditions, broaden the stable working range of the compressor, and increase its surge margin.

In the accompanying drawings, Fig. 1, Fig. 2 and Fig. 3 respectively represent three states, which are respectively the states of the bleed air recirculation sliding sleeve being half open, fully open and fully closed.

Claims (3)

1. the centrifugal-flow compressor casing bleed recirculation structure of variable geometry, comprise spiral case (8), compressor impeller (12), it is inner that compressor impeller (12) is arranged on spiral case (8), it is characterized in that: compressor impeller (12) is separately installed with primary blades (4) and splitterr vanes (10) along himself circumference, the inner gas control flume having annular of spiral case (8), backflow ring (13) is fixed with in gas control flume, the left side of backflow ring (13) and gas control flume, right side, the spiral case inwall in three directions, outside forms back flash (5) respectively, air-breathing groove (7), return flow line (6), back flash (5), return flow line (6), air-breathing groove is communicated with between (7) successively, air-breathing groove (7) is positioned between primary blades leading edge (3) and splitterr vanes leading edge (11), compressor inlet port (2) is formed between primary blades leading edge (3) and spiral case (8) end, the inner setting of compressor inlet port (2) can along the sliding sleeve of its movement (1).

2. the centrifugal-flow compressor casing bleed recirculation structure of variable geometry according to claim 1, is characterized in that: sliding sleeve (1) is at the inner mobile full-mesh, semi-connected and totally-enclosed realizing back flash (5) and compressor inlet port (2) of compressor inlet port (2).

3. the centrifugal-flow compressor casing bleed recirculation structure of variable geometry according to claim 1 and 2, is characterized in that: the arranged outside vane diffuser (9) of spiral case (8) inner primary blades (4) and splitterr vanes (10) trailing edge.