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CN-114962324-B - Centrifugal impeller and centrifugal compressor

CN114962324BCN 114962324 BCN114962324 BCN 114962324BCN-114962324-B

Abstract

The invention provides a centrifugal impeller and a centrifugal compressor. The centrifugal impeller comprises a wheel disc, a plurality of blades, a flap and a flap, wherein the blades are arranged on the wheel disc and distributed along the circumferential direction of the wheel disc, two adjacent blades are arranged at intervals, the flap is arranged at the rear edge of each blade, and the flap extends along the circumferential direction of the wheel disc. According to the invention, the flap extending towards the circumferential direction of the wheel disc is arranged at the rear edge of the blade, so that the increase of the energy from the inlet to the outlet of the blade during the rotation of the impeller can be facilitated without changing the integral structural parameters of the original blade and the molded line of the blade, and the flow direction of the fluid is not influenced, so that the air flow is disturbed, the fluid condition of the fluid at the outlet of the blade can be effectively changed, the performance of the impeller is improved, and the manufacturing cost is greatly reduced.

Inventors

  • YANG GUOMANG
  • WANG YUE
  • XIAO YONG

Assignees

  • 珠海格力电器股份有限公司
  • 珠海格力电器股份有限公司

Dates

Publication Date
20260421
Application Date
20220609
Priority Date
20220609

Claims (6)

  1. 1. A centrifugal impeller, comprising: a wheel disc; The blades are arranged on the wheel disc, distributed along the circumferential direction of the wheel disc and arranged at intervals between two adjacent blades; a flap provided at a trailing edge of each of the blades, the flap extending along a circumferential direction of the wheel disc; The flap inclines towards the pressure surface side of the blade, and the inclination angle gamma of the flap is an included angle between the flap and the axle center of the wheel disc, wherein the inclination angle gamma is more than or equal to 18 degrees and less than or equal to 30 degrees; The front section and the rear section of the blade are inclined and are in a curved shape, the front section is connected with the rear section through a middle section, the rear section is curved towards the suction surface side of the blade, the front section and the rear section of the blade are inclined towards the pressure surface side of the blade, the joint of the rear section of the blade and the flap is a first position, the tangent line of the rear section at the first position is a first tangent line, the tangent line of the flap at the first position is a second tangent line, and an included angle between the first tangent line and the second tangent line is equal to the inclination angle gamma of the flap; the thickness delta of the flap is the extension distance of the flap in the radial direction of the wheel disc, wherein the ratio of the thickness delta to the thickness of the trailing edge of the blade in the circumferential direction of the wheel disc is more than or equal to 40% and less than or equal to 100%; The width h of the flap is the extension distance of the flap in the axial direction of the wheel disc, wherein the ratio of the width h to the length of the trailing edge of the blade in the axial direction of the wheel disc is more than or equal to 50% and less than or equal to 100%.
  2. 2. The centrifugal impeller according to claim 1, wherein, The flap extends from a trailing edge of the blade toward the suction side.
  3. 3. The centrifugal impeller according to claim 1, wherein, The flap extends from a trailing edge of the blade toward a pressure face side.
  4. 4. A centrifugal impeller according to any one of claims 1-3, wherein, An included angle theta formed between a connecting line from the top of the flap to the axle center of the wheel disc and a connecting line from the bottom of the flap to the axle center of the wheel disc is larger than 0 degrees and smaller than or equal to 2 degrees, wherein the top of the flap is a free end of the flap, and the bottom of the flap is an edge connected with the trailing edge of the blade.
  5. 5. A centrifugal impeller according to any one of claims 1-3, wherein, The blades comprise a plurality of main blades and a plurality of splitter blades which are arranged along the circumferential direction of the wheel disc, wherein the main blades and the splitter blades are arranged in a staggered mode, and the trailing edge of each main blade and/or the trailing edge of each splitter blade is provided with a flap which extends along the circumferential direction of the wheel disc.
  6. 6. A centrifugal compressor, comprising: a centrifugal impeller according to any one of claims 1 to 5.

Description

Centrifugal impeller and centrifugal compressor Technical Field The invention belongs to the technical field of compressors, and particularly relates to a centrifugal impeller and a centrifugal compressor. Background With the gradual enhancement of energy conservation and environmental protection requirements and the vigorous development of hydrogen fuel cell technology, the development and research work of the vehicle fuel cell system has made great progress. Centrifugal compressors are also a hot spot of current research as "hearts" in automotive fuel cell systems. The performance of the centrifugal compressor directly determines the power generation efficiency and the choice of the demander. Centrifugal impellers are a core component of centrifugal compressors that rotate at high speeds to move a fluid (e.g., gas) from an inlet to an outlet of blades. Wherein the blade structure, profile directly affects the fluid conditions flowing through the blade outlet. In the related art, improvement of the impeller performance is expected by changing the overall structure of the blades, but the effect is not ideal and the cost is high. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a centrifugal impeller and a centrifugal compressor. The invention provides a centrifugal impeller which comprises a wheel disc, a plurality of blades, a flap and a flap, wherein the blades are arranged on the wheel disc and distributed along the circumferential direction of the wheel disc, two adjacent blades are arranged at intervals, the flap is arranged on the rear edge of each blade, and the flap extends along the circumferential direction of the wheel disc. In some embodiments, the flap extends from a trailing edge of the blade toward the suction side. In some embodiments, the flap extends from a trailing edge of the blade toward a pressure face side. In some embodiments, the flap has a height θ that is an angle formed between a line connecting the flap top to the disk center and a line connecting the flap bottom to the disk center, wherein the height θ is greater than 0 ° and less than or equal to 2 °. In some embodiments, the height θ is 0.5 °. In some embodiments, a thickness δ of the flap is an extension distance of the flap in a radial direction of the disk, wherein a thickness ratio of the thickness δ to the blade trailing edge in a circumferential direction of the disk is 40% or more and 100% or less. In some embodiments, the flap extends a distance in the disk axial direction, wherein a ratio of the width h to a length of the blade trailing edge in the disk axial direction is greater than or equal to 50% and less than or equal to 100%. In some embodiments, the flap is inclined towards the pressure face side of the blade, and the inclination angle gamma of the flap is an angle between the flap and the axle center of the wheel disc, wherein the inclination angle gamma is greater than or equal to 18 ° and less than or equal to 25 °. In some embodiments, the front section and the rear section of the blade are inclined, the front section is connected with the rear section through a middle section, wherein the rear section is bent towards the suction surface side of the blade, the front section and the rear section of the blade are both inclined towards the pressure surface side of the blade, the connection of the rear section and the flap is at a first position, the tangent line of the rear section at the first position is a first tangent line, the tangent line of the flap at the first position is a second tangent line, and an included angle between the first tangent line and the second tangent line is equal to the inclination angle gamma of the flap, wherein the middle section is connected between the front section and the rear section. In some embodiments, the blades comprise a plurality of main blades and a plurality of splitter blades arranged along the circumference of the disk, the main blades and the splitter blades being staggered, wherein the flap is arranged at the trailing edge of each main blade and/or the trailing edge of each splitter blade to extend along the circumference of the disk. A second aspect of the present disclosure also provides a centrifugal compressor comprising a centrifugal impeller as described in any one of the embodiments above. After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects: Through set up the wing flap that extends towards rim plate circumference at the blade trailing edge, need not to change on the basis of original blade overall structure parameter and blade molded lines, can be favorable to making the increase of blade import to export fluid energy when impeller rotates, and can not influence the flow direction of fluid, cause the air current disorder to can effectually change the fluid condition of fluid in blade exit, promote impeller performance, manufacturing cost al