Impeller for carbon dioxide centrifugal compressor

Abstract

This utility model relates to the field of centrifugal compressor technology, and discloses an impeller for a carbon dioxide centrifugal compressor. The impeller has a hub, a cover, and multiple main blades arranged between the hub and the cover. The roots of the main blades are connected to the hub, and the tops of the main blades are connected to the cover. A flow channel is formed between two adjacent main blades. Along the flow path of the flow channel, a diversion blade is installed at 35% of the length of the flow channel. The geometric angle and thickness distribution of the diversion blade are the same as those of the main blades from their corresponding installation positions. This utility model can effectively suppress outlet airflow separation, increase the impeller's variable operating range, and reduce flow losses.

Description

Technical Field

[0001] This utility model relates to the technical field of centrifugal compressors, specifically to an impeller for a carbon dioxide centrifugal compressor. Background Technology

[0002] In a compressed carbon dioxide energy storage system, carbon dioxide is pressurized and heated by a centrifugal compressor before entering a turbine to expand and do work. It can be seen that the pressurization degree of the centrifugal compressor can directly affect the turbine's work capacity, and thus affect the energy conversion efficiency of the entire energy storage system. However, due to the influence of factors such as rotation, curvature and viscosity, the internal flow of a centrifugal compressor is relatively complex, and phenomena such as secondary flow, backflow and flow separation often occur, resulting in flow losses. Utility Model Content

[0003] The technical objective of this invention is to address the shortcomings of the prior art by providing an impeller for a carbon dioxide centrifugal compressor that helps reduce flow loss.

[0004] The technical solution adopted in this utility model is as follows: An impeller for a carbon dioxide centrifugal compressor, the impeller having a hub, a cover, and a plurality of main blades arranged between the hub and the cover, the root of the main blades being connected to the hub, and the top of the main blades being connected to the cover; A flow channel is formed between two adjacent main flow blades. A flow divider blade is installed at a position 35% of the length of the flow channel along the flow path direction of the flow channel. The geometric angle and thickness distribution of the flow divider blade are the same as those of the main flow blade from the position corresponding to the installation position of the flow divider blade.

[0005] The aforementioned technical measures, by setting a diversion blade between two adjacent main flow blades at 35% of the flow channel length, ensure that only the main flow blades remain at the impeller inlet, thus reducing inlet blockage. The diversion blades divide the flow channel, increasing gas velocity, extending the subsequent deceleration and pressurization path, and softening the pressurization gradient, thereby reducing load, effectively suppressing outlet airflow separation, increasing the impeller's variable operating range, and reducing flow losses. Furthermore, the geometric angles and thickness distribution of the diversion blades are identical to those of the main flow blades from their corresponding installation positions, thus avoiding airflow impact caused by abrupt changes in the flow channel wall during gas flow without altering the original gas flow path.

[0006] Furthermore, the inlet installation angle on the wheel cover side of the main blade is -58.8°, the inlet installation angle on the hub side is -43.5°, the outlet installation angle on the wheel cover side is -40°, and the outlet installation angle on the hub side is -40°. The inlet mounting angle of the splitter blade on the wheel cover side is -56.8°, the inlet mounting angle on the wheel hub side is -32.4°, the outlet mounting angle on the wheel cover side is -40°, and the outlet mounting angle on the wheel hub side is -40°.

[0007] The above-mentioned technical measures, by controlling the inlet and outlet installation angles of the main flow blades and the split flow blades, facilitate smooth gas flow and help avoid airflow impact.

[0008] Furthermore, the outlet side of the main flow blade is inclined, and the angle between the outlet side of the main flow blade and the impeller axis is 13.12°. The outlet side of the flow divider blade has an inclined structure, and the angle between the outlet side of the flow divider blade and the impeller axis is 13.12°.

[0009] The outlet sides of both the main blades and the splitter blades in the above-mentioned technical measures are inclined structures, and the angle between them and the impeller axis is 13.12°. This can increase the effective flow area of ​​the gas at the outlet. At the same time, the inclination angle will change the flow direction of the gas and reduce the gas velocity, thereby reducing the Mach number in the flow channel. By reducing the Mach number, the shock wave intensity can be weakened, thereby improving the compressor's working efficiency and expanding the operating range.

[0010] Furthermore, the impeller has a hub ratio of 0.38.

[0011] The above-mentioned technical measures, by controlling the impeller hub ratio, help to increase the gas flow area, thereby reducing the flow velocity, Mach number, flow loss, and aerodynamic performance.

[0012] Furthermore, the ratio of the inlet root radius of the mainstream blade to the average outlet radius of the impeller is 0.38, the ratio of the inlet top radius of the mainstream blade to the average outlet radius of the impeller is 0.74, and the ratio of the outlet width of the mainstream blade to the average outlet radius of the impeller is 0.166.

[0013] The above-mentioned technical measures can optimize the curvature distribution at the root and tip of the main blade, make the surface curvature transition of the main blade uniform, make the gas flow process smoother, and help reduce flow loss.

[0014] Furthermore, the ratio of the inlet root radius of the diverter blade to the average outlet radius of the impeller is 0.43, the ratio of the inlet top radius of the diverter blade to the average outlet radius of the impeller is 0.75, and the ratio of the outlet width of the diverter blade to the average outlet radius of the impeller is 0.166.

[0015] The above-mentioned technical measures can optimize the curvature distribution at the root and top of the splitter blades, making the surface curvature transition of the splitter blades more uniform, making the gas flow process smoother, and helping to reduce flow losses.

[0016] Furthermore, the main blade has 8 blades, which are evenly distributed between the wheel hub and the wheel cover.

[0017] The above-mentioned technical measures, by uniformly arranging 8 main flow blades, enable the gas to enter each flow channel evenly when entering the impeller, avoiding local high loads caused by uneven distribution of main flow blades, and helping to reduce flow losses.

[0018] Furthermore, the number of the diverting blades is 8, and these diverting blades are evenly arranged between the wheel hub and the wheel cover.

[0019] The above-mentioned technical measures, by uniformly setting 8 flow divider blades, enable the gas to be evenly distributed when flowing in the flow channel, avoiding local high loads caused by uneven distribution of flow divider blades, and thus helping to reduce flow losses.

[0020] Furthermore, along the flow path direction of the flow channel, the hub-side mounting angle of the main flow blade first decreases and then increases.

[0021] Furthermore, along the flow path direction of the flow channel, the mounting angle of the wheel cover side of the main flow blade first increases and then decreases.

[0022] One or more technical solutions provided by this utility model have at least the following technical effects or advantages: This invention incorporates a diversion blade positioned between two adjacent main flow blades at 35% of the flow channel length. This ensures that only the main flow blades remain at the impeller inlet, reducing inlet blockage. The diversion blades divide the flow channel, increasing gas velocity, extending the subsequent deceleration and pressurization path, and softening the pressurization gradient. This reduces load, effectively suppresses outlet airflow separation, increases the impeller's variable operating range, and reduces flow losses. Furthermore, the geometric angles and thickness distribution of the diversion blades are identical to those of the main flow blades from their corresponding installation positions. This design does not alter the original gas flow path and helps avoid airflow impact caused by abrupt changes in the flow channel wall during gas flow. Attached Figure Description

[0023] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof. Figure 1 This is a schematic diagram of the impeller structure in this utility model; Figure 2 This is a top view of the impeller in this utility model (with the impeller cover removed). Figure 3This is a schematic diagram of the impeller structure in this utility model (with the impeller cover removed). Among them, 1-hub; 2-hub cover; 3-mainstream blade; 4-splitter blade. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Reference Figures 1-3 This embodiment provides an impeller for a carbon dioxide centrifugal compressor. The impeller has a hub 1, a cover 2, and multiple main blades 3 arranged between the hub 1 and the cover 2. The root of the main blades 3 is connected to the hub 1, and the top of the main blades 3 is connected to the cover 2. A flow channel is formed between two adjacent main flow blades 3. A flow divider blade 4 is installed at 35% of the length of the flow channel along the flow path direction. The geometric angle and thickness distribution of the flow divider blade 4 are the same as those of the main flow blade 3 from the position corresponding to the installation position of the flow divider blade 4.

[0027] The flow path direction of the channel refers to the direction from the channel inlet to the channel outlet; the channel length refers to the length of the flow path, that is, the total axial distance from the channel inlet to the channel outlet.

[0028] The inlet mounting angle of the main blade 3 on the wheel cover side is approximately -58.8°, the inlet mounting angle on the hub side is approximately -43.5°, the outlet mounting angle on the wheel cover side is approximately -40°, and the outlet mounting angle on the hub side is approximately -40°. The inlet mounting angle of the splitter blade 4 on the wheel cover side is approximately -56.8°, the inlet mounting angle on the wheel hub side is approximately -32.4°, the outlet mounting angle on the wheel cover side is approximately -40°, and the outlet mounting angle on the wheel hub side is approximately -40°.

[0029] The outlet side of the main blade 3 has an inclined structure, and the angle between the outlet side of the main blade 3 and the impeller axis is approximately 13.12°. The outlet side of the splitter blade 4 has an inclined structure, and the angle between the outlet side of the splitter blade 4 and the impeller axis is approximately 13.12°.

[0030] The impeller hub ratio is approximately 0.38.

[0031] The ratio of the inlet root radius of the main blade 3 to the average outlet radius of the impeller is approximately 0.38, the ratio of the inlet top radius of the main blade 3 to the average outlet radius of the impeller is approximately 0.74, and the ratio of the outlet width of the main blade 3 to the average outlet radius of the impeller is approximately 0.166.

[0032] The ratio of the inlet root radius of the splitter blade 4 to the average outlet radius of the impeller is approximately 0.43, the ratio of the inlet top radius of the splitter blade 4 to the average outlet radius of the impeller is approximately 0.75, and the ratio of the outlet width of the splitter blade 4 to the average outlet radius of the impeller is approximately 0.166.

[0033] The impeller outlet average radius refers to the average of the impeller outlet root radius and the impeller outlet top radius.

[0034] The main blade 3 has 8 blades, which are evenly distributed between the hub 1 and the cover 2.

[0035] The number of blades in the splitter blade 4 is 8, and these splitter blades 4 are evenly arranged between the hub 1 and the cover 2.

[0036] Along the flow path of the flow channel, the hub-side mounting angle of the main blade 3 first decreases and then increases.

[0037] Along the flow path of the flow channel, the hub-side mounting angle of the main blade 3 at the inlet of the flow channel is approximately -43.5°, the hub-side mounting angle reaches a minimum of approximately -19.5° between 50% and 60% of the flow channel, and the hub-side mounting angle at the outlet of the flow channel is approximately -40°.

[0038] Along the flow path of the flow channel, the mounting angle of the wheel cover side of the main flow blade 3 first increases and then decreases.

[0039] Along the flow path of the flow channel, the mounting angle of the main blade 3 on the wheel cover side at the inlet of the flow channel is approximately -58.8°, reaching a maximum of approximately -59.3° at the 10% position of the flow channel, and the mounting angle on the wheel cover side at the outlet of the flow channel is approximately -40°.

[0040] Except at the outlet of the flow channel where the mounting angle on the wheel cover side is equal to that on the hub side, the mounting angle on the wheel cover side is greater than that on the hub side at other locations. The difference between them first increases and then decreases, reaching its maximum value between 30% and 50% of the flow channel.

[0041] In this embodiment, the sign of each angle only indicates the direction of the blade profile relative to the impeller rotation direction. For example, the hub side mounting angle of the main blade 3 at the inlet of the flow channel is -43.5°, that is, it is tilted 43.5° in the opposite direction of the impeller rotation direction.

[0042] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0043] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An impeller for a carbon dioxide centrifugal compressor, the impeller having a hub (1), a cover (2) and a plurality of main blades (3) arranged between the hub (1) and the cover (2), the root of the main blades (3) being connected to the hub (1) and the top of the main blades (3) being connected to the cover (2); Its features are: A flow channel is formed between two adjacent main flow blades (3). A diversion blade (4) is installed at a position 35% of the length of the flow channel along the flow path direction of the flow channel. The geometric angle and thickness distribution of the diversion blade (4) are the same as those of the main flow blade (3) from the position corresponding to the installation position of the diversion blade (4).

2. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The inlet installation angle of the main blade (3) on the wheel cover side is -58.8°, the inlet installation angle on the wheel hub side is -43.5°, the outlet installation angle on the wheel cover side is -40°, and the outlet installation angle on the wheel hub side is -40°. The inlet installation angle of the splitter blade (4) on the wheel cover side is -56.8°, the inlet installation angle on the wheel hub side is -32.4°, the outlet installation angle on the wheel cover side is -40°, and the outlet installation angle on the wheel hub side is -40°.

3. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The outlet side of the main blade (3) is an inclined structure, and the angle between the outlet side of the main blade (3) and the impeller axis is 13.12°. The outlet side of the diverter blade (4) is an inclined structure, and the angle between the outlet side of the diverter blade (4) and the impeller axis is 13.12°.

4. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The impeller has a hub ratio of 0.

38.

5. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The ratio of the inlet root radius of the main blade (3) to the average outlet radius of the impeller is 0.38, the ratio of the inlet top radius of the main blade (3) to the average outlet radius of the impeller is 0.74, and the ratio of the outlet width of the main blade (3) to the average outlet radius of the impeller is 0.

166.

6. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The ratio of the inlet root radius of the diverter blade (4) to the average outlet radius of the impeller is 0.43, the ratio of the inlet top radius of the diverter blade (4) to the average outlet radius of the impeller is 0.75, and the ratio of the outlet width of the diverter blade (4) to the average outlet radius of the impeller is 0.

166.

7. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The number of blades of the main blade (3) is 8, and these main blades (3) are evenly arranged between the hub (1) and the wheel cover (2).

8. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: The number of blades of the diverter blade (4) is 8, and these diverter blades (4) are evenly arranged between the hub (1) and the wheel cover (2).

9. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: Along the flow path direction of the flow channel, the hub-side mounting angle of the main blade (3) first decreases and then increases.

10. The impeller for a carbon dioxide centrifugal compressor according to claim 1, characterized in that: Along the flow path direction of the flow channel, the wheel cover side mounting angle of the main flow blade (3) first increases and then decreases.

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