CN216044606U - Compressor impeller for fuel cell air compressor - Google Patents
Compressor impeller for fuel cell air compressor Download PDFInfo
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- CN216044606U CN216044606U CN202122571677.9U CN202122571677U CN216044606U CN 216044606 U CN216044606 U CN 216044606U CN 202122571677 U CN202122571677 U CN 202122571677U CN 216044606 U CN216044606 U CN 216044606U
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Abstract
The utility model discloses a compressor impeller for a fuel cell air compressor, which is of an integrated structure and comprises compressor blades and a hub, wherein the compressor blades are uniformly distributed on the hub by taking the axis of the hub as the center. The utility model discloses a compressor impeller for a fuel cell air compressor, which adopts long blades without matching with other small blades, can effectively reduce the vortex and backflow of air at a hub and the root of the blades, and improves the efficiency of the compressor. The overall performance of the impeller can be obviously improved by improving the blades, the highest efficiency of the compressor is more than 75% in a calibration state after the impeller is matched with the motor, the power consumption of the electric pile can be effectively reduced by improving the efficiency of the impeller of the compressor, and the net power output of the fuel cell can be effectively improved.
Description
Technical Field
The utility model relates to the field of air compressors for fuel cells, in particular to an air compressor impeller for a fuel cell air compressor.
Background
The compressor wheel is one of the main components of a gas turbine engine and functions to increase the pressure of the flowing gas stream by applying work thereto with low flow resistance loss. At present, most of the existing compressor impellers are assembled by an air guide wheel and a compressor wheel. During installation, blades of the inducer and the compressor wheel need to be strictly aligned, and therefore machining precision of the inducer and the compressor wheel needs to be high. And because the structures of the air guide wheel and the air compressor wheel are complex, the processing precision is difficult to ensure, and the air guide wheel and the air compressor wheel are difficult to align when being installed, so that a certain gap and a certain dislocation are always generated at the joint part, the eddy current is easy to generate at the joint part to increase the air flow resistance, and the efficiency of the air compressor is reduced. In addition, when the compressor is combined with the fuel cell when the efficiency is low, the electric pile of the fuel cell is consumed, and the output net power of the fuel cell is reduced.
Disclosure of Invention
The utility model provides a compressor impeller for a fuel cell air compressor, which improves the efficiency of the compressor and the output net power of the fuel cell.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the compressor impeller is of an integrated structure and comprises compressor blades and a hub, wherein the compressor blades are evenly distributed on the hub by taking the axis of the hub as the center.
Further, the ratio of the root radius to the tip radius of the compressor blade is 0.4-0.6.
Further, the axial length of the compressor blade is 21-23mm, and the blade height of the outlet of the compressor blade is 5-6 mm.
Further, the outer diameter of the hub is 7-15 mm.
Further, the outlet mounting angle between the compressor blade and the hub is 60-65 degrees.
Further, the compressor impeller is a backward-bent impeller.
The utility model discloses a compressor impeller for a fuel cell air compressor, which adopts long blades without matching with other small blades, can effectively reduce the vortex and backflow of air at a hub and the root of the blades, and improves the efficiency of the compressor. The overall performance of the impeller can be obviously improved by improving the blades, the highest efficiency of the compressor is more than 75% in a calibration state after the impeller is matched with the motor, the power consumption of the electric pile can be effectively reduced by improving the efficiency of the impeller of the compressor, and the net power output of the fuel cell can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a compressor structure for a fuel cell air compressor according to the present invention;
FIG. 2 is a meridian plane structure diagram of a compressor impeller of a fuel cell;
FIG. 3 is a schematic diagram of a three-dimensional structure of a fuel cell compressor impeller;
FIG. 4 is a schematic view of a fuel cell compressor impeller exit mount angle;
FIG. 5 is a schematic view of compressor blade angle distribution;
FIG. 6 is a schematic view of a compressor blade thickness distribution.
In the figure, 1, a compressor impeller, 2, a vaneless diffuser, 3, a back plate, 4, a volute, 11, a hub, 12, an inner meridian plane of the compressor impeller, 13, an outer meridian plane of the compressor impeller, 14, compressor blades, 15 and an outlet mounting angle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-6, the compressor wheel 1 for the fuel cell air compressor is an integrated structure, and includes compressor blades 14 and a hub 11, and the compressor blades 14 are evenly distributed on the hub 11 with an axis of the hub 11 as a center. In this embodiment, the compressor impeller 1 is not provided with splitter blades, but only adopts a main flow blade structure, and preferably, the number of the compressor blades 14 is 11.
Further, the compressor blade 14 has a root radius to tip radius ratio of 0.4 to 0.6. In this embodiment, preferably, the radius of the hub 11 is 8mm, and on this basis, the root radius and the tip radius of the compressor blade are adjusted, and preferably, when the ratio of the root radius to the tip radius is 0.4, the air outlet efficiency of the compressor impeller is the highest, and the highest efficiency of the compressor is greater than 75% in a calibration state after being matched with a motor. For the adjustment of the blade thickness, from the pneumatic simulation perspective, the smaller the blade thickness is, the better the performance of the centrifugal compressor is. There is a minimum in blade thickness for a combined consideration of structural strength and processing feasibility. In the embodiment, the blade tip thickness of the compressor blade is designed to be 0.3-0.5mm, and the blade root thickness of the compressor blade in the axial direction is 1-2mm, so that the requirement of the structural strength of the blade is met.
Further, the axial length of the compressor blade 14 is 21-23mm, and the blade height of the outlet of the compressor blade 14 is 5-6 mm.
Further, the outer diameter of the hub is 7-15 mm.
Further, the outlet mounting angle between the compressor blades 14 and the hub 11 is 60-65 °.
Further, the compressor impeller 1 is a backward-bent impeller. In the present embodiment, the compressor blades 14 are uniformly arranged on the hub 11, and the compressor blades 14 are not provided with splitter blades, and preferably, eleven long blades 14 are provided. As shown in fig. 2, the outer diameter G of the compressor impeller is 60-63mm, the outer diameter F of the inlet is 40-45mm, and the outer diameters of the inlet hub D and the inlet hub E are 7-15 mm; the axial length B from the inlet to the outlet of the blade is 21-23mm, the blade height A at the outlet of the blade is 5-6mm, and the integral axial length C of the compressor impeller is 23-25 mm. The compressor impeller is a backward-bent impeller, and the installation angle 15 of the blade outlet is about 60-65 degrees.
As shown in fig. 3, the inner meridian plane 12 and the outer meridian plane 13 of the compressor wheel are optimized by a bezier curve, and the maximum curvature value is controlled to ensure that the airflow smoothly transitions from the axial direction to the radial direction. When the inner meridian plane and the outer meridian plane of the compressor impeller are designed, the molded line between the casing of the compressor and the hub 11 of the compressor impeller is adjusted, and the curvature radius position of the casing of the compressor is adjusted, so that the inner meridian plane and the outer meridian plane of the compressor impeller with the highest compressor efficiency are found.
As shown in fig. 1, in this embodiment, when the compressor wheel for the fuel cell air compressor works, the compressor wheel 1 for increasing the air pressure by applying work to the entering air through high-speed rotation, the vaneless diffuser 2 for further increasing the pressure of the air with a certain rotation speed and direction, the back plate 3 for sealing, and the volute 4 for further increasing the air pressure with a certain flow path shape are provided.
Air enters the compressor impeller 1 through the air inlet system, the compressor impeller 1 rotates at a high speed under the driving of the motor to promote the kinetic energy of the air, the air accelerated along with the direction of the blades leaves the compressor impeller and enters the vaneless diffuser 2 at a high speed and in a certain direction, the vaneless diffuser does not have the throat area, the structure is simple and convenient to process, the kinetic energy of the air can be recovered at a high efficiency under the non-designed working condition, the air is diffused, the high-speed air is guided to enter the volute 4 for further pressurization, and the pressurized high-speed air enters the secondary compressor stage with the similar same structure through the connecting pipeline and then further promotes the pressure to achieve the air inlet pressure required by the fuel cell stack.
When air flows in the compressor impeller, the local flow direction is different from the main flow direction, vortexes and backflow are generated, flow obstruction is caused, the compressor stage efficiency is influenced, the efficiency of the fuel cell air compressor is further influenced, and the rationality of the design of the compressor impeller is of great importance.
Fig. 5 and 6 show schematic diagrams of blade angle and thickness distribution of a compressor wheel, both modeled by Bezier (Bezier) curves, where M is an inner meridian plane and N is an outer meridian plane. As can be seen from fig. 5, the blade angle variation at the inlet and outlet of the outer meridian plane is relatively small, and the blade angle variation is mainly concentrated in the main flow passage. The blade angle change of the inner meridian plane is adjusted according to the load condition at the blade root and the throat area of the blade until the optimal load distribution condition is achieved under the condition that the throat area is not changed. The angle distribution of the blades is continuously adjusted, so that the load of the cross section of each blade is reasonably distributed.
As can be seen from FIG. 6, the thickness distribution of the inner and outer meridian planes shows a rule that the two ends are small and the middle is large. This is because under the ideal circumstances, the mainstream district blade bears more load, needs to guarantee certain thickness and satisfies the strength requirement, avoids the blade atress fracture. Through continuous optimization design, the thickness of the impeller disclosed by the utility model can meet the requirements of strength and processing technology, can also meet the requirements of working conditions, and provides air with specified pressure requirements for a fuel cell; the overall performance of the impeller can be obviously improved by improving the blades, the highest efficiency of the compressor is more than 75% in a calibration state after the impeller is matched with the motor, the power consumption of the electric pile can be effectively reduced by improving the efficiency of the impeller of the compressor, and the net power output of the fuel cell can be effectively improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The compressor impeller for the fuel cell air compressor is characterized in that the compressor impeller (1) is of an integrated structure and comprises compressor blades (14) and a hub (11), wherein the compressor blades (14) are evenly distributed on the hub (11) by taking the axis of the hub (11) as the center.
2. The compressor wheel for a fuel cell air compressor as claimed in claim 1, characterized in that the compressor blade (14) has a ratio of the root radius to the tip radius of 0.4 to 0.6.
3. The compressor wheel for a fuel cell air compressor as claimed in claim 1, characterized in that the axial length of the compressor blades (14) is 21-23mm and the blade height of the outlet of the compressor blades (14) is 5-6 mm.
4. The compressor wheel for a fuel cell air compressor of claim 1, wherein the hub has an outer diameter of 7-15 mm.
5. Compressor wheel for a fuel cell air compressor according to claim 1, characterised in that the outlet mounting angle (15) between the compressor blade (14) and the hub (11) is 60 ° -65 °.
6. A compressor wheel for a fuel cell air compressor according to claim 1, characterized in that the compressor wheel (1) is a backward-curved impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122571677.9U CN216044606U (en) | 2021-10-25 | 2021-10-25 | Compressor impeller for fuel cell air compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122571677.9U CN216044606U (en) | 2021-10-25 | 2021-10-25 | Compressor impeller for fuel cell air compressor |
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| Publication Number | Publication Date |
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| CN216044606U true CN216044606U (en) | 2022-03-15 |
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| CN202122571677.9U Active CN216044606U (en) | 2021-10-25 | 2021-10-25 | Compressor impeller for fuel cell air compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001050A (en) * | 2021-10-25 | 2022-02-01 | 中车大连机车研究所有限公司 | Compressor impeller for fuel cell air compressor |
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- 2021-10-25 CN CN202122571677.9U patent/CN216044606U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001050A (en) * | 2021-10-25 | 2022-02-01 | 中车大连机车研究所有限公司 | Compressor impeller for fuel cell air compressor |
| CN114001050B (en) * | 2021-10-25 | 2024-06-04 | 中车大连机车研究所有限公司 | Compressor impeller for fuel cell air compressor |
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