CN112177943A - Integrated pipeline pump supported by wheel rim - Google Patents
Integrated pipeline pump supported by wheel rim Download PDFInfo
- Publication number
- CN112177943A CN112177943A CN202011105155.3A CN202011105155A CN112177943A CN 112177943 A CN112177943 A CN 112177943A CN 202011105155 A CN202011105155 A CN 202011105155A CN 112177943 A CN112177943 A CN 112177943A
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- Prior art keywords
- pump
- rim
- pump impeller
- gap
- annular groove
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/548—Specially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/648—Mounting; Assembling; Disassembling of axial pumps especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The embodiment of the invention provides a rim supported integrated pipeline pump, which comprises: the pump casing is internally provided with a hub which is coaxially arranged with the pump casing; the pump impeller is rotatably arranged on the hub; the rotary support is arranged at the upstream of the pump impeller, the fixed end of the rotary support is connected with the inner side wall of the pump shell, and the rotary end of the rotary support is connected with the rim of the pump impeller; the invention bears larger axial thrust on the pump impeller through the rotary support, provides reliable rotary support function for the pump impeller, ensures the running stability of the pump impeller, and can be applied to the application environment of high-load hydraulic design.
Description
Technical Field
The invention relates to the technical field of pipeline pumps, in particular to an integrated pipeline pump supported by a wheel rim.
Background
An axial flow pump is a pump that generates a driving force for a liquid by rotating blades of an impeller and transports the liquid in an axial direction. Traditional axial-flow pump includes the pump casing, pump impeller and the export guide vane body of coaxial arrangement, and pump impeller arranges along the rivers direction in the pump casing with the export guide vane body in proper order, and pump impeller connects in same root pivot, drives pump impeller's rotation by the pivot to reach the purpose to rivers pump sending with this. Due to the arrangement limitation of the rotating shaft, the water outlet side of the pump housing must be designed into a bent pipe structure, so that the flow of the inlet and the outlet of the axial flow pump is distributed in different directions. Therefore, in practical application, the axial flow pump is complex in structure, the overall structural design is not compact enough, and pumping operation cannot be performed in a straight-in and straight-out mode.
At present, based on the integration design theory of functional structure, the improved integrated pipeline pump is provided, the integrated design of a motor and a pump impeller is realized, the integrated pipeline pump has very compact characteristics, and is similar to the traditional axial-flow pump in hydraulic characteristics. The existing pipeline pump is provided with a liquid lubrication bearing for rotatably supporting a pump impeller at the hub side, and due to the compact characteristic of the pipeline pump, conventional lubricating oil is difficult to be introduced into the liquid lubrication bearing, but the liquid lubrication bearing is lubricated and supported by conveying working medium. When the conveyed working medium is water and other working media with viscosity far smaller than that of lubricating oil, the supporting capacity of the liquid lubricating bearing is greatly weakened, if a hydraulic design scheme of the pipeline pump adopts a high-load scheme, the pipeline pump can generate larger axial thrust to a pump impeller when running, and the bearing capacity of the liquid lubricating bearing is considered to be directly related to the area of the liquid lubricating bearing and limited by the narrow space of a wheel hub, so that the proper liquid lubricating bearing is difficult to be configured on the wheel hub to provide sufficient supporting capacity for the pump impeller.
Disclosure of Invention
The embodiment of the invention provides a rim-supported integrated pipeline pump, which is used for at least solving the problems that a liquid lubrication bearing arranged on the side of a hub on the existing pipeline pump is difficult to bear larger axial thrust of a pump impeller and cannot provide reliable rotary support for the pump impeller.
The embodiment of the invention provides a rim supported integrated pipeline pump, which comprises: the pump shell is internally provided with a hub which is coaxially arranged with the pump shell; the pump impeller is rotatably arranged on the hub; the rotary support is arranged on the upstream of the pump impeller, the fixed end of the rotary support is connected with the inner side wall of the pump shell, and the rotary end of the rotary support is connected with the rim of the pump impeller.
According to the rim-supported integrated pipeline pump provided by the embodiment of the invention, the inner side wall of the pump shell is provided with a first annular groove, the rim of the pump impeller extends into the first annular groove, and the fixed end of the rotary support is arranged on the upstream groove wall of the first annular groove.
According to the rim-supported integrated pipeline pump provided by the embodiment of the invention, the rotary support comprises a thrust bearing, and the disc surface of a thrust disc on the thrust bearing is at a preset inclination angle relative to the central axis of the pipeline pump.
According to the rim-supported integrated pipeline pump of one embodiment of the invention, the thrust bearing is a tilting pad thrust bearing.
According to the rim-supported integrated pipeline pump provided by the embodiment of the invention, the preset inclination angle is 60-85 degrees.
The rim supported integrated tubing pump according to one embodiment of the present invention further comprises: the driving motor comprises a motor stator and a motor rotor, the motor stator is installed at the bottom of the first annular groove, and the motor rotor is installed on the rim of the pump impeller and is arranged opposite to the motor stator.
According to the rim-supported integrated pipeline pump provided by the embodiment of the invention, a first gap is formed between the motor rotor and the motor stator, a second gap is formed between the downstream end of the motor rotor and the downstream groove wall of the first annular groove, a third gap is formed between the upstream end of the motor rotor and the upstream groove wall of the first annular groove, the second gap, the first gap and the third gap are sequentially communicated, and the rotary support is arranged in the third gap.
The rim supported integrated tubing pump according to one embodiment of the present invention further comprises: the guide vane body is located at the downstream of the pump impeller, and the hub is connected with the pump shell through the guide vane body.
The rim supported integrated tubing pump according to one embodiment of the present invention further comprises: the supporting shaft sleeve is rotatably arranged on the hub, and the pump impeller is arranged on the supporting shaft sleeve.
According to the integrated pipeline pump supported by the wheel rim, a second annular groove is formed on the outer side wall of the wheel hub, and the supporting shaft sleeve is sleeved in the second annular groove.
According to the rim-supported integrated pipeline pump provided by the embodiment of the invention, the rotary support positioned at the upstream of the pump impeller is arranged in the pump shell, the fixed end of the rotary support is connected with the inner side wall of the pump shell, and the rotary end of the rotary support is connected with the rim of the pump impeller.
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 described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a rim supported integrated tubing pump according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial enlarged structure at K in FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a thrust pad structure of a tilting pad thrust bearing according to an embodiment of the present invention.
In the figure, 1, a pump housing; 2. a hub; 3. a pump impeller; 4. a guide blade body; 5. a first annular groove; 6. rotating and supporting; 7. a motor stator; 8. a motor rotor; 9. a first gap; 10. a second gap; 11. a third gap; 12. a support sleeve; 13. and a thrust pad.
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 any inventive step, are within the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides a rim supported integrated tubing pump comprising: the pump casing 1 is characterized in that a first annular groove 5 is formed in the inner side wall of the pump casing 1, and a hub 2 which is coaxially arranged with the pump casing 1 is arranged in the pump casing 1; the pump impeller 3 is rotationally arranged on the hub 2, and the rim of the pump impeller 3 extends into the first annular groove 5; the rotary support 6 is arranged at the upstream of the pump impeller 3, the fixed end of the rotary support 6 is arranged on the upstream groove wall of the first annular groove 5, and the rotary end of the rotary support 6 is connected with the rim of the pump impeller 3.
Specifically, the pipe pump shown in this embodiment, by providing the first annular groove 5 on the inner side wall of the pump housing 1, and by providing the rotary support 6 between the upstream groove wall of the first annular groove 5 and the rim of the pump impeller 3, because the rotary support 6 is disposed on the rim side of the pump impeller 3 with a larger radius, a larger installation space is provided, which helps to weaken the average pressure that the rotary support can bear, and can effectively bear a larger axial thrust on the pump impeller 3, and provide a reliable rotary support function for the pump impeller 3, thereby ensuring the stability of the operation of the pump impeller 3, and being applicable to the application environment of high-load hydraulic design.
It should be noted here that by inserting the rim of the pump impeller 3 into the first annular groove 5 and providing the rotary support 6 between the upstream groove wall of the first annular groove 5 and the rim of the pump impeller 3, on the one hand, the compactness of the overall structure of the pipe pump can be ensured, a space for mounting and positioning the rotary support 6 is provided, and on the other hand, the rotary support 6 is prevented from being exposed to the outside of the first annular groove 5 to affect the flow of the main flow fluid in the pump housing 1, and in addition, since there is a gap between the rim of the pump impeller 3 and the first annular groove 5 to form a liquid cooling flow passage, the rotary support 6 can be cooled and lubricated.
In one preferred embodiment, the rotary support 6 shown in this embodiment comprises a thrust bearing, which may be a fixed pad thrust bearing or a tilting pad thrust bearing known in the art, or a ball thrust bearing or other types of thrust bearings known in the art may be used if the overall design load is appropriate and the physical and chemical properties of the delivered working medium are good.
As shown in fig. 2, the bearing seat of the thrust bearing shown in this embodiment is fixedly installed on the upstream groove wall of the first annular groove 5, the thrust disc of the thrust bearing is installed on the rim of the pump impeller 3, the disc surface of the thrust disc forms a preset inclination angle with respect to the central axis of the pipeline pump, and the preset inclination angle is 60-85 °.
Based on the mounting structure of the thrust disc and the rim of the pump impeller 3, the acting force generated by the thrust disc on the rim of the pump impeller 3 comprises an axial direction and a radial direction, wherein the axial direction is towards the downstream direction of the pump impeller 3, and the radial direction is towards the center of the pipeline pump, so that in a working state, the thrust bearing can simultaneously balance the axial thrust towards the upstream direction of the pump impeller 3 by fluid, the gravity of the pump impeller 3 and other weak unbalanced forces, and the rotation stability of the pump impeller 3 is greatly ensured.
In a further preferred embodiment, the thrust bearing in this embodiment is preferably a tilting pad thrust bearing. Fig. 3 is a schematic structural diagram of a thrust pad 13 of the tilting pad thrust bearing, wherein four thrust pads 13 are arranged at preset intervals to form a circumferential structure. Because a small gap exists between the thrust disc and the thrust shoe 13, when fluid in the pipeline pump is introduced into the gap, a liquid film can be formed at a certain rotating speed, a large liquid film supporting effect is generated on the thrust disc, and the thrust disc provides corresponding rotating support for the rim of the pump impeller 3 so as to balance the axial thrust of the fluid on the pump impeller 3, the gravity of the pump impeller 3 and other weak unbalanced forces.
As shown in fig. 1, based on the improvement of the above embodiment, the pipe pump of this embodiment is further provided with a driving motor, the driving motor includes a motor stator 7 and a motor rotor 8, the motor stator 7 is installed at the bottom of the first annular groove 5, and the motor rotor 8 is installed at the rim of the pump impeller 3 and is arranged opposite to the motor stator 7.
Specifically, in the embodiment, the motor rotor 8 is integrated on the rim of the pump impeller 3, and the motor stator 7 and the motor rotor 8 which are arranged oppositely form the driving motor, so that the pump impeller 3 can be driven to synchronously rotate along with the motor rotor 8 based on the electromagnetic action between the motor stator 7 and the motor rotor 8, and the integrated design of the pipeline pump structure is realized, the structure is compact, and the pipeline pump has the characteristics of straight-in and straight-out when fluid is pumped.
As shown in fig. 2, in the present embodiment, a first gap 9 is formed between the motor rotor 8 and the motor stator 7, a second gap 10 is formed between the downstream end of the motor rotor 8 and the downstream groove wall of the first annular groove 5, a third gap 11 is formed between the upstream end of the motor rotor 8 and the upstream groove wall of the first annular groove 5, the second gap 10, the first gap 9, and the third gap 11 are sequentially communicated, and the rotation support 6 is installed in the third gap 11.
Specifically, in actual operation, the first gap 9 formed between the motor rotor 8 and the motor stator 7 can prevent friction and collision between the rotating motor rotor 8 and the stationary motor stator 7, and the second gap 10, the first gap 9 and the third gap 11 are sequentially communicated with each other to form a cooling channel for naturally cooling the motor stator 7 and the motor rotor 8. When the pipeline pump pumps fluid, the pressure of the fluid at the downstream is greater than that of the fluid at the upstream, and under the action of the pressure difference, a part of the water flow in the main flow enters from the inlet of the second gap 10, flows through the first gap 9 between the motor stator 7 and the motor rotor 8, naturally cools the motor stator 7 and the motor rotor 8, and flows out from the outlet of the third gap 11 after passing through the rotary support 6 in the third gap 11.
It should be noted here that when the rotating support 6 is preferably a tilting pad thrust bearing, it is provided with cooling lubrication and liquid film support by the fluid flowing through the tilting pad thrust bearing.
As shown in fig. 1, the pipe pump of the present embodiment is further provided with a vane guide 4, the vane guide 4 is located downstream of the pump impeller 3, and the hub 2 is connected to the pump housing 1 through the vane guide 4.
Specifically, the vane guide body 4 shown in this embodiment is fixed and located at the outlet side of the pump housing 1, and since the vane guide body 4 is fixedly connected to the hub 2 and the pump housing 1, the vane guide body 4 serves as a support member on one hand to support the hub 2 and distribute the hub 2 in the central axial direction of the pump housing 1, and on the other hand, the circumferential velocity of the pump impeller 3 to the main flow is recovered, so as to improve the efficiency of the pipe pump.
As shown in fig. 1, the pipeline pump of this embodiment is further provided with a supporting shaft sleeve 12, the supporting shaft sleeve 12 is rotatably mounted on the hub 2, and the pump impeller 3 is mounted on the supporting shaft sleeve 12.
Specifically, the outer side wall of the hub 2 shown in this embodiment is formed with a second annular groove, and the support sleeve 12 is fitted in the second annular groove. Here, by rotatably mounting the support sleeve 12 in the second annular recess, on the one hand the support sleeve 12 can be positioned by the second annular recess, and on the other hand the support sleeve 12 can also be prevented from being directly exposed outside the hub 2, resulting in an influence on the flow and pumping of the fluid in the pump housing 1.
According to the embodiment, when the pipeline pump is in a non-working state, the pump impeller 3 does not rotate, the thrust bearing cannot form a liquid film supporting effect at the moment, the pump impeller 3 sinks towards the gravity direction due to the self-weight effect, the supporting shaft sleeve 12 is in direct contact with the hub 2, and the gravity on the pump impeller 3 is transmitted to the hub 2 through the contact surface of the supporting shaft sleeve 12 and the hub 2 and is sequentially transmitted to the guide vane body 4 and the pump shell 1.
When the pipeline pump is in a working state, the pump impeller 3 is driven by the driving motor to rotate along the hub 2, the rotating support 6 forms a liquid film supporting effect at the moment, the axial thrust of fluid to the pump impeller 3, the gravity of the pump impeller 3 and other weak unbalanced forces can be balanced, the acting force is correspondingly transmitted to the pump shell 1 through the rotating support 6 at the moment, a certain tiny gap is kept between the support shaft sleeve 12 and the hub 2 and is naturally filled by the fluid, the support shaft sleeve 12 is ensured not to be in direct contact with the hub 2, and the pump impeller 3 is enabled to stably and efficiently rotate so as to efficiently pump the fluid.
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 (10)
1. A rim supported integrated tubing pump, comprising:
the pump shell is internally provided with a hub which is coaxially arranged with the pump shell;
the pump impeller is rotatably arranged on the hub;
the rotary support is arranged on the upstream of the pump impeller, the fixed end of the rotary support is connected with the inner side wall of the pump shell, and the rotary end of the rotary support is connected with the rim of the pump impeller.
2. A rim supported integrated piping pump according to claim 1, wherein a first annular groove is formed on an inner side wall of said pump housing, into which a rim of said pump impeller projects, and a fixed end of said rotary support is mounted to an upstream groove wall of said first annular groove.
3. A rim supported integrated channel pump as claimed in claim 2, wherein the rotational support comprises a thrust bearing with a thrust disc having a disc face at a predetermined inclination with respect to a central axis of the channel pump.
4. Rim supported integrated channel pump according to claim 3, characterized in that the thrust bearing is a tilting pad thrust bearing.
5. Rim supported integrated channel pump according to claim 3, characterized in that said preset inclination angle is of the order of 60 ° -85 °.
6. A rim supported integrated tubing pump according to any one of claims 2 to 5, further comprising: the driving motor comprises a motor stator and a motor rotor, the motor stator is installed at the bottom of the first annular groove, and the motor rotor is installed on the rim of the pump impeller and is arranged opposite to the motor stator.
7. A rim supported integrated pipe pump according to claim 6, wherein a first gap is formed between the motor rotor and the motor stator, a second gap is formed between the downstream end of the motor rotor and the downstream groove wall of the first annular groove, a third gap is formed between the upstream end of the motor rotor and the upstream groove wall of the first annular groove, the second gap, the first gap and the third gap are communicated in sequence, and the rotary support is mounted in the third gap.
8. A rim supported integrated tubing pump according to any one of claims 1 to 5, further comprising: the guide vane body is located at the downstream of the pump impeller, and the hub is connected with the pump shell through the guide vane body.
9. A rim supported integrated tubing pump according to any one of claims 1 to 5, further comprising: the supporting shaft sleeve is rotatably arranged on the hub, and the pump impeller is arranged on the supporting shaft sleeve.
10. A rim supported integrated channel pump as claimed in claim 9, wherein the hub has a second annular groove formed in an outer side wall thereof, and the support boss is fitted in the second annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011105155.3A CN112177943A (en) | 2020-10-15 | 2020-10-15 | Integrated pipeline pump supported by wheel rim |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011105155.3A CN112177943A (en) | 2020-10-15 | 2020-10-15 | Integrated pipeline pump supported by wheel rim |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112177943A true CN112177943A (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011105155.3A Pending CN112177943A (en) | 2020-10-15 | 2020-10-15 | Integrated pipeline pump supported by wheel rim |
Country Status (1)
| Country | Link |
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| CN (1) | CN112177943A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623245A (en) * | 2021-08-02 | 2021-11-09 | 鑫磊压缩机股份有限公司 | Magnetic suspension axial flow fan with impeller as thrust disc |
| CN114056529A (en) * | 2021-10-28 | 2022-02-18 | 西安理工大学 | Rim driving propeller with dummy shaft structure |
-
2020
- 2020-10-15 CN CN202011105155.3A patent/CN112177943A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623245A (en) * | 2021-08-02 | 2021-11-09 | 鑫磊压缩机股份有限公司 | Magnetic suspension axial flow fan with impeller as thrust disc |
| CN114056529A (en) * | 2021-10-28 | 2022-02-18 | 西安理工大学 | Rim driving propeller with dummy shaft structure |
| CN114056529B (en) * | 2021-10-28 | 2022-09-23 | 西安理工大学 | Rim driving propeller with dummy shaft structure |
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