CN114278619B - Device for improving cavitation resistance of fuel pump - Google Patents
Device for improving cavitation resistance of fuel pump Download PDFInfo
- Publication number
- CN114278619B CN114278619B CN202111624157.8A CN202111624157A CN114278619B CN 114278619 B CN114278619 B CN 114278619B CN 202111624157 A CN202111624157 A CN 202111624157A CN 114278619 B CN114278619 B CN 114278619B
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- CN
- China
- Prior art keywords
- impeller
- fuel pump
- inlet pipe
- inlet
- cavitation resistance
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- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 22
- 239000000411 inducer Substances 0.000 abstract description 7
- 230000010349 pulsation Effects 0.000 abstract description 3
- 230000004323 axial length Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of aviation application, in particular to a device for improving cavitation resistance of a fuel pump. The inlet pipe comprises two vertical rectangular separation discs, the separation discs are vertical to the inlet surface, a section of the inlet pipe, which is close to the top of the impeller, is provided with a plurality of orifices, and the center line of each orifice is flush with the top of each impeller blade; the impeller is a semi-open spiral impeller, and the impeller hub and the rim are inclined straight lines; according to the design structure, on one hand, the separating disc and the throttling hole are designed on the inlet pipe, so that the pre-rotation strength of the inlet can be effectively reduced, the backflow is led away, the backflow is prevented from being opposite to the incoming flow, the backflow is restrained, the cavitation performance of the pump is improved, the pressure pulsation is reduced, and the like. The design solves the matching design problem of the inducer and the main impeller in the traditional design, improves the reliability of the structure, avoids the problems of backflow and mismatching of attack angles generated at the joint of the inducer and the impeller, and reduces the axial length dimension of the pump.
Description
Technical Field
The invention relates to the technical field of aviation application, in particular to a device for improving cavitation resistance of a fuel pump.
Background
The aviation fuel centrifugal pump is widely applied to fuel supply and transportation of an aircraft fuel system. Under the high-altitude flight condition, the pressure of the suction inlet of the fuel pump is reduced, cavitation is easy to generate, and the performance, the service life and the reliability of the fuel pump are adversely affected. The fuel pump is required to have high cavitation resistance due to the high altitude cavitation caused by the flying height of the aircraft. The inducer and impeller are used as main moving hydraulic components of the fuel pump, and the structure and the design of inlet flow conditions of the inducer and impeller are crucial to the cavitation performance influence of the whole fuel pump.
Disclosure of Invention
The purpose of the invention is that: the device for improving the cavitation resistance of the fuel pump is capable of improving the hydraulic efficiency of the fuel pump, improving the inlet flow condition of the fuel pump, reducing pressure pulsation and further improving the operation stability of the fuel pump.
The technical scheme of the invention is as follows:
a device for improving cavitation resistance of a fuel pump comprises an inlet pipe, an impeller and a mounting seat; the inlet pipe is connected with the mounting seat, and the mounting seat is close to the inlet end and sequentially provided with the sealing ring and the impeller. The inlet pipe comprises two vertical rectangular separation discs, the separation discs are vertical to the inlet surface, a section of the inlet pipe, which is close to the top of the impeller, is provided with a plurality of throttle holes, and the center line of each throttle hole is flush with the top of each impeller blade; the impeller is a semi-open spiral impeller, and the impeller hub and the rim are inclined straight lines;
the impeller further comprises the sealing ring, and the sealing ring is arranged between the mounting seat and the impeller.
The impeller should have both axial flow and centrifugal characteristic of the rotating wheel, the hub and the rim are straight lines, the included angle between the hub and the axis is 30-60 degrees, and the included angle between the rim and the axis is 20-50 degrees. The structure of the hub and the rim can effectively enable the impeller to transition from axial flow characteristics to centrifugal characteristics, solve the problem of mismatching of an attack angle between an inducer and the impeller in the traditional design, improve the flow field and the pressure field inside the impeller, effectively prevent laminar flow from generating, and increase the correction coefficient of limited blades, thereby improving the performance of the pump and improving the flow velocity distribution and cavitation performance of the pump.
Further, the separation disc is a plurality of pieces. Preferably 2 to 4 tablets. More preferably 2 tablets.
Further, the separating disc is a rectangular separating disc. It is preferably 0.6 to 1.0 times the inlet diameter in length. More preferably 0.8, inlet diameter.
Further, the thickness of the separation disc is 1.5-2.5 m, preferably 2.0mm.
Furthermore, the connection position of the separation disc and the inlet pipe is designed with a round angle, and the round angle is R1 mm-R3 mm, preferably R1.
Further, the plurality of orifices of the inlet pipe are symmetrically distributed, and the number of the orifices is 6-12.
Further, the direction of the throttle hole is opposite to the rotation direction of the vane of the impeller, and the center line of the throttle hole is internally tangent with each side of the N-sided shape, wherein N is the number of throttle holes.
Further, the diameter of the throttle hole is 3-6 mm.
Further, the clearance between the impeller and the oil pump port is 0.1-0.5 mm, preferably 0.2mm.
Further, the blade inlet of the impeller is a plane, preferably 2-4 blades. More preferably 3 tablets.
Further, the impeller comprises an axle, the axle is a hollow axle, and a kidney-shaped hole is formed in the hollow axle and connected with a motor shaft, so that torque is transmitted to the rotating wheel to drive the rotating wheel to operate.
Further, the sealing ring is arranged on the support, and at least one sealing ring groove is formed in the sealing ring. The sealing ring groove consists of a plurality of grooves distributed along the axial direction.
Further, the mounting seat is of a mounting connection structure, the support seats comprise support blocks uniformly distributed along the circumference, the thickness of the support blocks is 2-3 mm, and the number of the support blocks is 3-4.
The invention has the beneficial effects that:
the invention designs a design structure for improving cavitation performance of a fuel pump. According to the design structure, on one hand, the separating disc and the throttling hole are designed on the inlet pipe, so that the strength of inlet pre-rotation can be effectively reduced, backflow is led away, the backflow is prevented from being opposite to incoming flow, the backflow is restrained, on the other hand, the efficiency of the rotating wheel is improved, the cavitation performance of the pump is improved, the pressure pulsation is reduced, and the like. Meanwhile, the design solves the problem of matching design of the inducer and the main impeller in the traditional design, improves the reliability of the structure, effectively avoids the problems of backflow, mismatching attack angle and the like at the joint of the inducer and the impeller, and reduces the axial length dimension of the pump.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic illustration of an inlet tube of the present invention;
FIG. 3 is a cross-sectional view of an orifice location;
FIG. 4 is a schematic view of an impeller;
FIG. 5 is a schematic view of the bottom of the impeller;
FIG. 6 is a schematic view of a seal ring.
FIG. 7 is a cross-sectional view of the mounting bracket taken along the support block.
Wherein: 1-inlet pipe, 1 a-separation disc, 1 b-orifice, 2-impeller, 2 a-waist-shaped hole, 3-sealing ring, 3 a-sealing ring groove and 4-installation seat.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples for more clearly understood objects, technical solutions and advantages of the present invention.
Embodiment 1, referring to fig. 1, a design structure for improving cavitation performance of a fuel pump is provided, which comprises an inlet pipe 1, an impeller 2, a sealing ring 2 and a mounting seat 4; the inlet pipe comprises two vertical rectangular separation discs 1a, the separation discs are vertical to the inlet surface, the inlet pipe is provided with a plurality of orifices 1b, and the center line of the orifices is flush with the tops of the impeller blades; the impeller is a semi-open impeller and has both axial flow and centrifugal characteristics, the impeller is connected with the shaft through a waist-shaped hole 2a, and the impeller hub and the rim are inclined straight lines; the sealing ring comprises a sealing type sealing ring groove 3a;
the separation disc 1a is a plurality of pieces. Preferably 2 to 4 tablets. More preferably 2 tablets. The pre-selected strength of the pump inlet can be effectively reduced, and the generation of backflow can be inhibited.
The separation discs 1a are rectangular separation discs. It is preferably 0.6 to 1.0 times the inlet diameter in length. More preferably 0.8, inlet diameter.
The thickness of the separation disc 1a is 1.5-2.5 m, preferably 2.0mm.
The connection position of the separation disc 1a and the inlet pipe 1 is designed with a round angle, and the round angle is R1-R3, preferably R1.
The inlet pipe 1 is provided with a plurality of orifices 1b, the central line height of the orifices 1b is flush with the tops of the blades of the impeller 2, and the number of the orifices 1b is 6-12.
The orifices 1b are uniformly distributed along the circumferential direction, the direction of the orifices 1b is opposite to the rotation direction of the blades, and the center line of the orifices 1b is internally tangent with each side of an N-sided shape, wherein N is the number of the orifices. The throttle hole 1b can effectively guide back flow when the inlet of the impeller 2 forms back flow, so that the throttle hole is not opposite to the inflow, the cavitation resistance of the pump is improved, and the running stability is improved.
The diameter of the throttle hole 1b is 3-6 mm.
The clearance between the impeller 2 and the oil pump opening is 0.1-0.5 mm, the excessive clearance can increase hydraulic loss, the efficiency and performance of the pump are affected, the clearance is too small, the manufacturing difficulty is high, the possibility of scraping and rubbing exists, and the preferable range is 0.2mm.
The blade inlet of the impeller 2 is a plane, preferably 2 to 4 blades. More preferably 3 tablets.
The impeller 2 comprises a hollow shaft with a waist-shaped hole 2a connected with a motor shaft, so as to transmit torque to the rotating wheel and drive the rotating wheel to operate. The kidney-shaped hole 2a can replace the traditional key transmission, and has higher reliability compared with the key transmission.
The sealing ring 3 is arranged on the support, and a sealing ring groove 3a is formed in the sealing ring 3. The sealing ring groove 3a is composed of a plurality of grooves distributed along the axial direction. The structure is a labyrinth seal structure and is mainly used for reducing leakage between the rotating wheel and the shell.
The mounting support 4 is of a mounting connection structure, and comprises support blocks uniformly distributed along the circumference, wherein the thickness of the support blocks is 2-3 mm, and the number of the support blocks is 3-4.
Claims (8)
1. The device for improving the cavitation resistance of the fuel pump is characterized by comprising an inlet pipe (1), an impeller (2) and a mounting seat (4); the inlet pipe (1) is connected with the mounting seat (4), and the mounting seat (4) is close to the inlet end and is sequentially provided with the sealing ring (3) and the impeller (2); the inlet pipe (1) comprises two perpendicular rectangular separation discs, the separation discs are perpendicular to the inlet surface, a section of the inlet pipe (1) close to the top of the impeller (2) is provided with a plurality of orifices, and the center line of each orifice is level with the top of each impeller blade; the impeller (2) is a semi-open spiral impeller, the hub and the rim of the impeller (2) are inclined straight lines, the orifice direction is opposite to the rotation direction of blades of the impeller (2), and the center line of the orifice is internally tangent with each side of the N-sided shape.
2. The device for improving cavitation resistance of a fuel pump of claim 1, wherein the impeller has both axial flow and centrifugal characteristics, the hub and rim are straight, the hub is angled from the axis by 30 ° to 60 °, and the rim is angled from the axis by 20 ° to 50 °.
3. The apparatus for improving cavitation resistance of a fuel pump of claim 1 wherein said separator disc is a plurality of pieces; the separating disc is a rectangular separating disc; the length is 0.6 to 1.0 times of the diameter of the inlet; the thickness of the separation disc is 1.5-2.5 mm, a round angle is designed at the connection position of the separation disc and the inlet pipe, and the round angle is R1-R3 mm.
4. The device for improving cavitation resistance of the fuel pump according to claim 1, wherein a plurality of orifices of the inlet pipe (1) are symmetrically distributed, and the number of the orifices is 6-12.
5. The apparatus for improving cavitation resistance of a fuel pump of claim 1, wherein N is the number of orifices; the diameter of the throttle hole is 3-6 mm.
6. The device for improving cavitation resistance of the fuel pump according to claim 1, wherein the clearance between the impeller (2) and the oil pump port is 0.1-0.5 mm; the blade inlet of the impeller (2) is a plane, and the number of the blades is specifically 2-4; the impeller (2) comprises an axle, the axle is a hollow axle, and a kidney-shaped hole is formed in the hollow axle and connected with a motor shaft.
7. The device for improving cavitation resistance of the fuel pump according to claim 1, wherein the sealing ring (3) is mounted on a support, and at least one sealing ring groove is formed in the sealing ring (3); the sealing ring groove consists of a plurality of grooves distributed along the axial direction.
8. The device for improving cavitation resistance of the fuel pump according to claim 1, wherein the mounting base (4) is a mounting connection structure, and the support comprises support blocks uniformly distributed along the circumference, wherein the thickness of the support blocks is 2-3 mm, and the number of the support blocks is 3-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111624157.8A CN114278619B (en) | 2021-12-28 | 2021-12-28 | Device for improving cavitation resistance of fuel pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111624157.8A CN114278619B (en) | 2021-12-28 | 2021-12-28 | Device for improving cavitation resistance of fuel pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114278619A CN114278619A (en) | 2022-04-05 |
| CN114278619B true CN114278619B (en) | 2023-12-08 |
Family
ID=80877181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111624157.8A Active CN114278619B (en) | 2021-12-28 | 2021-12-28 | Device for improving cavitation resistance of fuel pump |
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| Country | Link |
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| CN (1) | CN114278619B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2342564C1 (en) * | 2007-06-05 | 2008-12-27 | Владимир Николаевич Кудеяров | Mixed-flow screw-type pump with automatic unit for rotor relief from axial force |
| JP2010014077A (en) * | 2008-07-07 | 2010-01-21 | Nikkiso Co Ltd | Reverse flow prevention device in centrifugal pump suction pipe |
| CN102425565A (en) * | 2011-12-07 | 2012-04-25 | 江苏振华泵业制造有限公司 | Centrifugal pump structural design with inducer with long and short vanes |
| CN204402971U (en) * | 2015-01-08 | 2015-06-17 | 张爱习 | A kind of channel-style helico-centrifugal pump |
| CN109915418A (en) * | 2019-03-18 | 2019-06-21 | 江苏大学 | A kind of blade extension type vertical centrifugal pump airflow fence and the centrifugal pump using the airflow fence |
| CN111706553A (en) * | 2020-06-23 | 2020-09-25 | 西安航空学院 | Fastening nut capable of preventing entrance low-pressure cavitation |
-
2021
- 2021-12-28 CN CN202111624157.8A patent/CN114278619B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2342564C1 (en) * | 2007-06-05 | 2008-12-27 | Владимир Николаевич Кудеяров | Mixed-flow screw-type pump with automatic unit for rotor relief from axial force |
| JP2010014077A (en) * | 2008-07-07 | 2010-01-21 | Nikkiso Co Ltd | Reverse flow prevention device in centrifugal pump suction pipe |
| CN102425565A (en) * | 2011-12-07 | 2012-04-25 | 江苏振华泵业制造有限公司 | Centrifugal pump structural design with inducer with long and short vanes |
| CN204402971U (en) * | 2015-01-08 | 2015-06-17 | 张爱习 | A kind of channel-style helico-centrifugal pump |
| CN109915418A (en) * | 2019-03-18 | 2019-06-21 | 江苏大学 | A kind of blade extension type vertical centrifugal pump airflow fence and the centrifugal pump using the airflow fence |
| CN111706553A (en) * | 2020-06-23 | 2020-09-25 | 西安航空学院 | Fastening nut capable of preventing entrance low-pressure cavitation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114278619A (en) | 2022-04-05 |
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