CN108194424B

CN108194424B - Vane type casing processing device based on compressor volute asymmetry

Info

Publication number: CN108194424B
Application number: CN201711174694.0A
Authority: CN
Inventors: 何海龙; 佟鼎; 刘欣源; 黄磊; 高鹏浩; 刘畅
Original assignee: China North Engine Research Institute Tianjin
Current assignee: China North Engine Research Institute Tianjin
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2020-05-08
Anticipated expiration: 2037-11-22
Also published as: CN108194424A

Abstract

The invention provides a vane type casing processing device based on asymmetry of a compressor volute, which comprises the compressor volute, a casing guide vane with a curved vane, a casing sleeve and a casing outer wall. The casing guide vane is arranged at the inlet of the compressor volute and fixedly arranged on the inner side of the casing sleeve, and comprises a ring body and a plurality of blades arranged on the outer side surface of the ring body; the outer wall of the casing, the casing sleeve and the compressor volute are connected together in sequence. The invention has the following advantages: the blade type casing treatment using the casing guide vane can control the gas flow in the casing groove channel, realize the optimized adjustment of the characteristics of the gas compressor, better reduce the surge flow of the gas compressor and effectively widen the flow range; meanwhile, the blade distribution of the casing guide blade at the circumferential corresponding position of the throat of the volute is lower than that of other circumferential areas, and the stable working range of the gas compressor is further widened based on the asymmetry of the volute.

Description

Vane type casing processing device based on compressor volute asymmetry

Technical Field

The invention belongs to the technical field of exhaust gas turbocharging, and particularly relates to a vane type casing processing device based on asymmetry of a compressor volute.

Background

The special requirement of continuously increasing the power of the vehicle engine, continuously reducing the discharge capacity and recovering the plateau environment power enables the pressure ratio of the gas compressor of the turbocharger to be continuously increased. After the supercharging pressure ratio is increased, the internal flow of the centrifugal compressor is changed into complex transonic flow, and the stable working range is sharply narrowed. In order to satisfy the requirements of good matching between the supercharger and the vehicle engine and high pressure ratio supercharging in plateau environment, the centrifugal compressor has to have a wider stable working range, especially at high pressure ratio.

For the research of widening the stable working range of the centrifugal compressor, the existing stability expanding method mainly comprises the following steps: under the near-surge working condition, gas close to the wall surface of the casing of the impeller channel is guided into an inlet channel of the gas compressor through the casing processing groove under the action of differential pressure so as to delay the occurrence of surge; under the condition of near-blockage, air at the inlet channel of the compressor is guided into the impeller channel of the compressor through the casing processing groove under the action of pressure difference, so that the purpose of air supplement is achieved.

In the prior art, the research on the optimization control of the gas flow in the casing treatment groove by the casing treatment method for the stability expansion of the compressor is less, the control of the flow in the groove by using the guide vane only focuses on the surge or blockage single direction, and the asymmetry of the volute of the compressor is not considered when the guide vane type casing treatment is used.

Disclosure of Invention

In view of the above, the present invention is directed to a vane type casing processing apparatus based on asymmetry of a compressor volute to optimize performance of a conventional casing processing method and further improve a flow range of a compressor.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a vane type casing processing device based on asymmetry of a compressor volute comprises a centrifugal compressor volute, a casing guide vane with a bent vane, a casing sleeve and a casing outer wall; the casing guide vane is arranged at the inlet of the compressor volute and fixedly arranged on the inner side of the casing sleeve, and comprises a ring body and a plurality of bent vanes arranged on the outer side surface of the ring body; the outer wall of the casing, the casing sleeve and the compressor volute are connected together in sequence.

Furthermore, the casing guide vane is fixedly installed on the inner side of the casing sleeve through a screw, and the casing guide vane and the casing sleeve are coaxial.

Furthermore, the casing sleeve and the casing outer wall are both composed of a cylinder body with openings at two ends and a connecting edge at one end, and a bolt sequentially penetrates through the casing outer wall connecting edge and the casing sleeve connecting edge to be connected with the end part of the compressor volute; the inner diameters of the casing sleeve and the outer wall of the casing are the same and are coaxial; the barrel of the casing sleeve is positioned on the inner side of the compressor volute.

Further, the blades on the casing guide vane are non-uniformly distributed in the circumferential direction, the 1 st blade is arranged at the position where theta is equal to 0 degree, 2 blades are uniformly arranged at an included angle of 30 degrees at intervals in the direction of 0-90-180-270 degrees, then 14 blades are uniformly arranged at an included angle of 20 degrees at intervals, and the total number of the blades on the casing guide vane is 17.

Furthermore, the specified range of the blade included angle α on the casing guide vane is 45-80 degrees, and the specified range of the blade included angle β is 0-30 degrees.

Compared with the prior art, the invention has the following advantages:

(1) compared with the common casing treatment, the blade type casing treatment using the casing guide vane can control the gas flow in the casing groove, realize the optimized adjustment of the characteristics of the gas compressor, better reduce the surge flow of the gas compressor, increase the blocking flow and effectively widen the flow range;

(2) the blade distribution of the casing guide blade at the circumferential corresponding position of the throat of the volute is lower than that of other circumferential areas, the flow characteristics of the impeller of the gas compressor and the flow characteristics in the volute are optimized based on the asymmetry of the volute, and the stable working range of the gas compressor is further widened.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a perspective view of a casing processing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a casing guide vane according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of a casing vane according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a blade arrangement angle of a casing guide vane according to an embodiment of the present invention;

FIG. 5 is a schematic view illustrating the position of a blade θ of the casing guide vane according to the embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a casing sleeve according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an outer wall of a casing according to an embodiment of the present invention.

Description of reference numerals:

1-compressor volute; 2-casing guide vane, 3-casing sleeve, 4-casing outer wall, 5-blade leading edge and 6-blade trailing edge.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A blade type casing processing device based on asymmetry of a compressor volute is shown in figure 1 and comprises a centrifugal compressor volute 1, a casing guide vane 2 with a bent blade, a casing sleeve 3 and a casing outer wall 4, wherein the casing guide vane 2 is arranged at an inlet of the compressor volute 1, the casing guide vane 2 is fixedly installed on the inner side of the casing sleeve 3 through a screw, the casing guide vane and the casing sleeve are coaxial, and the casing outer wall 4, the casing sleeve 3 and the compressor volute 1 are sequentially connected together.

As shown in fig. 2, the casing guide vane 2 comprises a circular ring body and a plurality of curved blades arranged on the outer side surface thereof, as shown in fig. 3, a blade angle α at a blade leading edge 5 of the casing guide vane 2 is 45-80 degrees, a blade angle β at a blade trailing edge 6 is 0-30 degrees, and a blade angle α and a blade angle β respectively refer to included angles between the blade leading edge 5 and the blade trailing edge 6 and the axis of the casing guide vane 2.

In the best embodiment, based on the asymmetry of the volute, the blades on the casing guide vane 2 are non-uniformly distributed in the circumferential direction, as shown in fig. 4, the 1 st blade is arranged at 0 °, 2 blades are uniformly arranged at an included angle of 30 ° at intervals in the direction of 0 ° -90 ° -180 ° -270 ° (the rotation direction of the compressor), and then 14 blades are uniformly arranged at an included angle of 20 ° at intervals, and 17 blades are arranged on the casing guide vane 2. As shown in fig. 5, the position where θ is 0 ° refers to a direction perpendicular to the compressor inlet axis on the compressor inlet side.

As shown in fig. 6 and 7, the casing sleeve 3 and the casing outer wall 4 are both composed of a cylinder body with two open ends and a connecting edge at one end, and in fig. 1, a bolt sequentially penetrates through the connecting edge of the casing outer wall 4 and the connecting edge of the casing sleeve 3 to be connected with the end part of the compressor volute 1; the inner diameters of the casing sleeve 3 and the casing outer wall 4 are the same and are coaxial; the barrel body of the casing sleeve 3 is positioned on the inner side of the compressor volute 1.

When the air compressor works, a structural gap formed by the volute 1 of the air compressor, the guide vane 2 of the casing, the sleeve 3 of the casing and the outer wall 4 of the casing is a bypass channel for treating the casing, the end part of the ring body of the guide vane 2 of the casing and the volute 1 of the air compressor form an oblique seam channel, the outer diameter surface of the ring body of the guide vane 2 of the casing, the sleeve 3 of the casing and the outer wall 4 of the casing form a casing groove channel, and blades of the guide vane 2 of the casing are positioned in the casing groove channel.

Under the condition of near surge, the gas of the compressor impeller channel close to the oblique seam channel enters the compressor inlet channel through the oblique seam channel and the casing groove channel under the action of differential pressure and under the guide action of the casing guide vane 2 blade, so as to delay the generation of surge, at the moment, the gas flow flows from the blade front edge 5 to the blade tail edge 6, the blade angle α at the blade front edge 5 is 45-80 degrees so as to adapt to the incoming flow of the gas containing a large tangential velocity component, the blade angle β at the blade tail edge 6 is 0-30 degrees, the bypass gas flow enters the compressor inlet channel and is mixed with the main gas flow to form a reverse pre-rotation gas flow opposite to the rotation direction of the compressor, so that the surge flow can be further reduced, under the condition of near blockage, the air of the compressor inlet channel flows into the oblique seam channel through the casing groove channel under the reverse guide action of the casing guide vane 2 blade, and is finally guided into the compressor impeller channel, so that the Mach number.

The blades of the casing guide vanes 2 are circumferentially and non-uniformly distributed to adapt to the asymmetry of the compressor volute 1, and the flow characteristics of gas entering the compressor impeller and the volute are optimized by the rectification of the casing guide vanes 2 to the gas in the casing groove channel during working.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A vane type casing processing device based on asymmetry of a compressor volute is characterized in that: the centrifugal type compressor casing guide vane structure comprises a centrifugal compressor volute (1), a casing guide vane (2), a casing sleeve (3) and a casing outer wall (4), wherein the casing outer wall (4) is aligned with one end of the casing sleeve (3) and then sequentially connected with the compressor volute (1) through bolts;

the casing guide vane (2) comprises a ring body and a plurality of bent vanes which are arranged on the outer side face of the ring body in a non-uniform mode, the casing guide vane (2) is arranged at the inlet of the compressor volute (1) and is fixedly installed on the inner side of the casing sleeve (3), a slant seam channel is formed between the end part of one side of the ring body of the casing guide vane (2) and the compressor volute (1), a casing groove channel is formed between the outer diameter surface of the ring body of the casing guide vane (2) and the casing sleeve (3) and the outer wall (4) of the casing, and the vanes of the casing guide vane (2) are located in the casing groove channel.

2. The blade-type casing processing device based on compressor volute asymmetry as claimed in claim 1, wherein: the guide vane (2) of the casing is fixedly installed on the inner side of the casing sleeve (3) through a screw, and the guide vane (2) of the casing and the casing sleeve (3) are coaxial.

3. The blade-type casing processing device based on compressor volute asymmetry as claimed in claim 1, wherein: the casing sleeve (3) and the casing outer wall (4) are both composed of a cylinder body with openings at two ends and a connecting edge at the outer edge of one end of the cylinder body, and bolts sequentially penetrate through the connecting edge of the casing outer wall (4) and the connecting edge of the casing sleeve (3) to be connected with the end part of the compressor volute (1); the inner diameters of the casing sleeve (3) and the casing outer wall (4) are the same and are coaxial; the barrel body of the casing sleeve (3) is positioned on the inner side of the compressor volute (1).

4. The blade-type casing processing device based on compressor volute asymmetry as claimed in claim 1, wherein: the blades on the casing guide vane (2) are non-uniformly distributed in the circumferential direction, the 1 st blade is arranged at the position where theta is 0 degrees, 2 blades are uniformly arranged at an included angle of 30 degrees at intervals in the direction of 0-90-180-270 degrees, then 14 blades are uniformly arranged at an included angle of 20 degrees at intervals, 17 blades are arranged on the casing guide vane (2), wherein the position where theta is 0 degrees refers to the direction perpendicular to the axis of the inlet of the compressor on one side of the inlet of the compressor.

5. The blade type casing processing device based on the asymmetry of the compressor volute casing as claimed in claim 1, wherein a blade included angle α between a blade leading edge (5) of the casing guide vane (2) and an axis of the casing guide vane 2 ranges from 45 ° to 80 °, and a blade included angle β between a blade trailing edge (6) and the axis of the casing guide vane (2) ranges from 0 ° to 30 °.