CN117759543A - Double-end oil supply pump without communication pipeline - Google Patents
Double-end oil supply pump without communication pipeline Download PDFInfo
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- CN117759543A CN117759543A CN202311791088.9A CN202311791088A CN117759543A CN 117759543 A CN117759543 A CN 117759543A CN 202311791088 A CN202311791088 A CN 202311791088A CN 117759543 A CN117759543 A CN 117759543A
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- 238000004891 communication Methods 0.000 title claims description 28
- 239000000446 fuel Substances 0.000 claims abstract description 101
- 239000000411 inducer Substances 0.000 claims abstract description 35
- 230000008676 import Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 61
- 238000007789 sealing Methods 0.000 claims description 33
- 239000000295 fuel oil Substances 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 16
- 230000004323 axial length Effects 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 1
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 1
- 241001330002 Bambuseae Species 0.000 abstract 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 1
- 239000011425 bamboo Substances 0.000 abstract 1
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The application provides a no double-end fuel feed pump of intercommunication pipeline, including handle 1, lower stator casing 2, sealed section of thick bamboo 3, lower impeller 4, motor 5, integrated casing 6, go up stator casing 7, main impeller 8, integral type inlet pipe 9, inducer 10 and upper end import valve 11, wherein: the integrated shell 6 is used for a double-end pump structure and comprises a double-end oil supply pump mounting flange, a lower guide vane shell mounting flange, an overflow cavity, a flow around cavity, an upper end inlet valve mounting flange, a volute and the like; the overflow cavity is positioned outside the motor, and the overflow area formed in the middle of the overflow cavity is 1.5-2 times of the area of the fuel inlet of the lower pump; the flow-around cavity is positioned outside the volute chamber and at the initial position of the volute spiral structure, the lower end of the flow-around cavity is connected with the flow-through cavity, the upper end of the flow-around cavity is connected with the outlet of the inducer 10, the cross section of the flow-around cavity is in a flat annular band shape, and the flow-through area at the minimum position of the flow-around cavity is 1-1.2 times of the area of the fuel inlet of the pump at the lower end.
Description
Technical Field
The invention belongs to the aviation application technology, and relates to a double-end oil supply pump without a communicating pipeline.
Background
With the development of aviation science and technology, aircraft have increasingly higher technical requirements on finished products on board. For aviation fuel pumps, particularly fuel feed pumps, not only can the functional performance indexes proposed by an aircraft be met and double-end fuel supply be carried out to meet different flight attitudes, but also the characteristics of small size, light weight, good maintainability and the like are required, and higher requirements are provided for the development of the aviation fuel pumps.
The common aviation fuel feed pump is generally provided with an upper volute and a lower volute, the upper end and the lower end can work independently, and fuel oil at the upper end and the lower end is converged through a communicating pipe and then is delivered to an aircraft fuel feed pipeline. Although the traditional structural form can meet the functional performance requirement, the double-volute structure and the pipeline structure connecting the upper end and the lower end have the characteristics of large size, heavier weight and deviation of the gravity center from the rotation center shaft, so that the miniaturization, the light weight design and the rotational inertia design of the product are affected, and the installation and the stress of the product are not facilitated.
Disclosure of Invention
The purpose of the invention is that: the utility model provides a do not have bi-polar fuel feed pump of intercommunication pipeline, it realizes bi-polar pump upper and lower extreme intercommunication through multi-functional integrated form casing, reaches the purpose that reduces product volume size, lightens product weight and optimize structural performance.
The technical solution of the invention is as follows: the utility model provides a no double-end fuel feed pump of intercommunication pipeline, includes handle 1, lower stator casing 2, seal cylinder 3, lower impeller 4, motor 5, integrated casing 6, goes up stator casing 7, main impeller 8, integral type inlet pipe 9, inducer 10 and upper end import valve 11, wherein:
the integrated shell 6 is used for a double-end pump structure and comprises a double-end oil supply pump mounting flange, a lower guide vane shell mounting flange, an overflow cavity, a flow around cavity, an upper end inlet valve mounting flange and a volute chamber; the overcurrent cavity is positioned outside the motor, the inner diameter of the overcurrent cavity is larger than the outer diameter of the motor shell, and the overcurrent area formed in the middle of the overcurrent cavity is 1.5-2 times of the area of the fuel inlet of the lower pump; the flow-around cavity is positioned outside the volute chamber and at the initial position of the volute spiral structure, the lower end of the flow-around cavity is connected with the flow-through cavity, the upper end of the flow-around cavity is connected with the outlet of the inducer 10, the cross section of the flow-around cavity is in a flat annular strip shape, and the flow-through area at the minimum position of the flow-around cavity is 1-1.2 times of the area of the fuel inlet of the pump at the lower end; the bypass cavity protrudes out of the surface of the bypass cavity shell and the volute, but cannot exceed the bottom product mounting flange;
the lower guide vane shell 2, the sealing cylinder 3, the lower guide vane impeller 4, the motor 5, the integrated shell 6, the upper guide vane shell 7, the main impeller 8, the integrated inlet pipe 9 and the inducer 10 are arranged in the integrated shell 6, the upper end of the integrated shell 6 is connected with the upper end inlet valve 11, the sealing cylinder 3 is arranged in the inner cavity of the lower end of the integrated shell 6, and the handle 1 is positioned at the bottom end surface of a product;
the two ends of the motor 5 extend out of the rotating shafts, the upper end shaft is sequentially connected with an inducer 10 and a main impeller 8, and the lower end shaft is connected with a lower guide impeller 4; the outer parts of impellers at two ends of the motor are respectively connected with an upper guide vane shell 7 and a lower guide vane shell 2, and the upper guide vane shell 7 is connected with an integrated inlet pipe 9.
Furthermore, the integrated housing 6 is used for a double-end oil feed pump device, only one volute is adopted, the flow distribution ratio of the upper end and the lower end is 1/4-4, the volute is positioned at one end with larger flow, and the flow-around cavity is positioned outside the volute and is also positioned at one end with larger flow.
Furthermore, the inner cavity of the integrated shell 6 is of a stepped annular cavity structure, and is respectively connected with the sealing ring 3, the lower guide vane shell 2, the motor 5 supporting ribs, the upper guide vane shell 7, the integrated inlet pipe 9 and the upper inlet valve 11 from the lower end to the upper end, wherein the coaxiality of each stepped annular surface is not less than phi 0.02mm.
Further, a sealing area is arranged between the integrated shell 6 and the lower guide vane shell 2 and the integrated inlet pipe 9, so that pressurized fuel in the inner cavity is isolated from the fuel inlets at the upper end and the lower end respectively; a sealing rubber ring with a 0-shaped circular section is adopted, and the compression amount of the rubber ring is 8% -20%.
Further, the annular surface of the shell of the motor 5 is provided with 3-6 supporting ribs, the width of each supporting rib is 8-15 mm, the axial length is recommended to be not less than 20mm, the outer edge of each supporting rib is an arc surface, and the supporting ribs are matched with the inner cavity of the integrated shell 6.
Furthermore, the integral inlet pipe 9 is an integrated structure of an upper inlet pipe, a confluence cavity and an oil pump port of the double-end oil supply pump without a communication pipeline, and an inducer 10 is arranged in the inlet pipe to provide an oil inlet channel for the upper pump; the oil pump port is connected with the main impeller 8, and the profile of the outlet edge of the oil pump port is consistent with the profile of the main impeller 8 axial projection drawing cover plate, so that the gap between the oil pump port and the main impeller cover plate profile is kept uniform, and the gap range is 0.2-0.4 mm; a converging cavity is arranged between the inlet pipe and the oil pump port and is an upper end and lower end fuel converging area, a fuel circulating window is formed in the wall surface of the converging cavity area, the fuel circulating window adopts a circular structure, a square window is adopted when a larger circulating area is needed, and the area of the formed window is not lower than the minimum area of the bypass cavity; the area of the fuel oil circulation window is 1-2 times of the area of the fuel oil inlet of the lower end pump.
Furthermore, the lower impeller 4 is an integrated body of an inducer and a mixed flow impeller, the inducer is arranged at the inlet, the mixed flow impeller is arranged at the outlet, and the outer diameter of the outlet of the lower impeller is smaller than the diameter of the inlet.
Further, the lower guide vane shell 2 is provided with guide vanes outside the lower guide vane impeller 4, the bending direction of the guide vanes is opposite to that of the lower guide vane impeller, the number of the guide vanes is generally 4-9, and the number of the guide vane vanes and the number of the guide vane impeller blades are prime numbers.
Furthermore, the sealing cylinder 3 is annular, the outer diameter is matched with the corresponding installation inner diameter of the integrated shell 6, the middle section is provided with a hole, the fuel at the lower end flows into the double-end fuel supply pump without a communication pipeline through the hole at the middle section, the axial length of the hole at the middle section is determined according to the working flow of the pump at the lower end, and the area of the hole is not smaller than 2 times of the area of the fuel inlet at the lower end; the perforated ring surface is sunken relative to the outer diameter of the sealing cylinder 3, a band-shaped filter screen is arranged in the sunken area, and the sunken depth dimension is larger than the thickness of the filter screen.
The invention has the beneficial effects that: the present invention is applicable to a variety of double ended pump devices. The conventional double-ended pump device is provided with upper and lower fuel communication pipes on one side of a motor mounting case, which are connected to inlets or outlets of upper and lower fuel pumps, due to functional requirements. The double-end pump device is not a regular revolving body structure of the installation shell, the installation space and the weight of the device are increased by the external communicating pipe, and the gravity center of the device deviates from the rotation central axis of the motor installation shell, so that the installation and the structural performance of the device are not facilitated. The double-end pump structure without the communicating pipe adopts a multifunctional integrated mounting shell structure, so that the double-end pump does not need to be provided with an external communicating pipe, the mounting size space of the device is saved, the structural composition of the device is reduced, and the weight of the device is lightened. Because no external communication pipeline exists, the gravity center of the device is still positioned on the rotation central axis of the motor installation shell, no deviation occurs, the installation and the structural performance of the device are facilitated, and the technical direction of miniaturization and light weight of the fuel pump is met.
Meanwhile, the motor is used as the maximum heating source of the device, and special design measures are needed to be adopted for heat dissipation of the motor. Because the upper end and the lower end of the double-end pump device are connected by adopting the overcurrent cavity structure and are positioned outside the motor shell, when the double-end pump works, the flowing fuel can well take away the heat generated by the motor during the work, the working environment of the motor is improved, and the working reliability and the service life of the motor are improved; when the motor is designed, heat dissipation design measures are not needed, and the design of the product is simplified.
Description of the drawings:
fig. 1 is a schematic diagram of the external structure of a double-ended feed pump without a communication pipe according to the present invention.
Fig. 2 is a sectional view showing the construction of a double-ended fuel feed pump without a communication pipe according to the present invention.
Fig. 3 is a cross-sectional view of a double-ended oil supply pump flow chamber structure without a communication pipeline according to the present invention.
Fig. 4 is a cross-sectional view of a double-ended feed pump bypass chamber structure without a communication line according to the present invention.
Fig. 5 is a block diagram of an integral inlet pipe of a double-ended feed pump without a communication line according to the present invention.
Fig. 6 is a sectional view showing the structure of an integral inlet pipe of a double-end oil feed pump without a communicating pipe and the cooperation of the integral inlet pipe.
FIG. 7 is a block diagram of a double ended feed pump lower inducer without a connecting conduit according to the present invention.
FIG. 8 is a cross-sectional view of a double ended feed pump lower vane housing guide vane structure without a communication conduit in accordance with the present invention.
Wherein: 1-handle, 2-lower guide vane shell, 3-seal cylinder, 4-lower guide vane impeller, 5-motor, 6-integrated shell, 7-upper guide vane shell, 8-main impeller, 9-integrated inlet pipe, 10-inducer and 11-upper inlet valve.
Detailed Description
The utility model provides a no connecting tube's bi-polar fuel feed pump can effectively solve above-mentioned problem, optimizes the structural property and the installation performance of product, lightens the weight of product, improves the maintenance performance of product. 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.
Example 1
The invention provides a double-end oil feed pump without a communication pipeline, which comprises a handle 1, a lower guide vane shell 2, a sealing cylinder 3, a lower guide vane 4, a motor 5, an integrated shell 6, an upper guide vane shell 7, a main impeller 8, an integrated inlet pipe 9, an inducer 10 and an upper end inlet valve 11, wherein:
the integrated shell 6 is used for a double-end pump structure and comprises a double-end oil supply pump mounting flange, a lower guide vane shell mounting flange, an overflow cavity, a flow around cavity, an upper end inlet valve mounting flange and a volute chamber; the overcurrent cavity is positioned outside the motor, the inner diameter of the overcurrent cavity is larger than the outer diameter of the motor shell, and the overcurrent area formed in the middle of the overcurrent cavity is 1.5-2 times of the area of the fuel inlet of the lower pump; the flow-around cavity is positioned outside the volute chamber and at the initial position of the volute spiral structure, the lower end of the flow-around cavity is connected with the flow-through cavity, the upper end of the flow-around cavity is connected with the outlet of the inducer 10, the cross section of the flow-around cavity is in a flat annular strip shape, and the flow-through area at the minimum position of the flow-around cavity is 1-1.2 times of the area of the fuel inlet of the pump at the lower end; the bypass cavity protrudes out of the surface of the bypass cavity shell and the volute, but cannot exceed the bottom product mounting flange;
the lower guide vane shell 2, the sealing cylinder 3, the lower guide vane impeller 4, the motor 5, the integrated shell 6, the upper guide vane shell 7, the main impeller 8, the integrated inlet pipe 9 and the inducer 10 are arranged in the integrated shell 6, the upper end of the integrated shell 6 is connected with the upper end inlet valve 11, the sealing cylinder 3 is arranged in the inner cavity of the lower end of the integrated shell 6, and the handle 1 is positioned at the bottom end surface of a product;
the two ends of the motor 5 extend out of the rotating shafts, the upper end shaft is sequentially connected with an inducer 10 and a main impeller 8, and the lower end shaft is connected with a lower guide impeller 4; the outer parts of impellers at two ends of the motor are respectively connected with an upper guide vane shell 7 and a lower guide vane shell 2, and the upper guide vane shell 7 is connected with an integrated inlet pipe 9.
It should be noted that, the double-end oil supply pump adopts the multifunctional integrated shell 6, not only provides a mounting platform for other components, but also provides a specific flow passage for the fuel oil working medium around the volute area, thereby avoiding the structure of connecting the upper end and the lower end of the double-end pump with a pipeline, and saving the size, the volume and the weight of the product.
Specifically, the integrated housing 6 is used for a double-end oil feed pump device, only one volute is adopted, the flow distribution ratio of the upper end and the lower end is 1/4-4, the volute is positioned at one end with larger flow, the flow-around cavity is positioned outside the volute, and the flow-around cavity is also positioned at one end with larger flow.
Specifically, the inner cavity of the integrated shell 6 is of a stepped annular cavity structure, and is respectively connected with the sealing ring 3, the lower guide vane shell 2, the motor 5 supporting ribs, the upper guide vane shell 7, the integrated inlet pipe 9 and the upper inlet valve 11 from the lower end to the upper end, wherein the coaxiality of each stepped annular surface is not less than phi 0.02mm.
In practical application, the coaxiality of each stepped ring surface is not less than phi 0.05mm at worst.
Specifically, the integrated housing 6 is provided with a sealing area between the integrated housing and the lower guide vane housing 2 and the integrated inlet pipe 9, so that pressurized fuel in the inner cavity is isolated from the fuel inlets at the upper end and the lower end respectively. A sealing rubber ring with a 0-shaped circular section is adopted, and the compression amount of the rubber ring is 8% -20%.
Specifically, the integrated housing 6 is formed by casting.
In practical application, the integrated housing 6 is made of cast aluminum alloy, and cast steel is not recommended to be adopted in the field of aviation fuel pumps. With the innovation of the machining method, the integrated housing 6 can also be molded using additive manufacturing.
Specifically, the annular surface of the shell of the motor 5 is provided with 3-6 supporting ribs, the width of each supporting rib is 8-15 mm, the axial length is recommended to be not less than 20mm, the outer edge of each supporting rib is an arc surface, and the supporting ribs are matched with the inner cavity of the integrated shell 6.
Specifically, the integral inlet pipe 9 is an integrated structure of an upper inlet pipe, a confluence cavity and an oil pump port of the double-end oil supply pump without a communication pipeline, and an inducer 10 is arranged in the inlet pipe to provide an oil inlet channel for the upper pump; the oil pump port is connected with the main impeller 8, and the profile of the outlet edge of the oil pump port is consistent with the profile of the main impeller 8 axial projection drawing cover plate, so that the gap between the oil pump port and the main impeller cover plate profile is kept uniform, and the gap range is 0.2-0.4 mm; a converging cavity is arranged between the inlet pipe and the oil pump port and is an upper end and lower end fuel converging area, a fuel circulating window is formed in the wall surface of the converging cavity area, the fuel circulating window adopts a circular structure, a square window is adopted when a larger circulating area is needed, and the area of the formed window is not lower than the minimum area of the bypass cavity; the area of the fuel oil circulation window is 1-2 times of the area of the fuel oil inlet of the lower end pump.
Specifically, the lower impeller 4 is an integrated body of an inducer and a mixed flow impeller, the inducer is formed at the inlet, the mixed flow impeller is formed at the outlet, and the outer diameter of the outlet of the lower impeller is smaller than the diameter of the inlet.
Specifically, the lower guide vane shell 2 is provided with guide vanes outside the lower guide vane impeller 4, the bending direction of the guide vanes is opposite to that of the lower guide vane impeller, the number of the guide vanes is generally 4-9, and the number of the guide vane vanes and the number of the guide vane impeller blades are prime numbers.
Specifically, the sealing cylinder 3 is in a ring shape, the outer diameter of the sealing cylinder is matched with the corresponding installation inner diameter of the integrated shell 6, the middle section is provided with a hole, the fuel at the lower end flows into the double-end fuel supply pump without a communication pipeline through the hole at the middle section, the axial length of the hole at the middle section is determined according to the working flow of the pump at the lower end, and the area of the hole is not smaller than 2 times of the area of the fuel inlet at the lower end; the perforated ring surface is sunken relative to the outer diameter of the sealing cylinder 3, a band-shaped filter screen is arranged in the sunken area, and the sunken depth dimension is larger than the thickness of the filter screen.
Working principle: in order to meet the requirements of forward flight, reverse flight and other postures of the fighter plane, the aircraft fuel feed pump is generally shaped like a double-end pump. The double-end pump is vertically arranged and comprises an upper end pump and a lower end pump, wherein an oil inlet is respectively formed in the upper end and the lower end of the oil supply pump, and fuel oil can be sucked from the upper end and the lower end of the aircraft oil tank. Each end pump can work independently, so that the oil supply pump can still meet the requirements of different flight attitudes of the aircraft under the condition that the oil tank is not full of oil. According to the double-end fuel supply pump without the communicating pipe, the lower end pump sucks fuel from the lower part of the fuel tank through the opening in the middle of the sealing cylinder 3, the rotation of the motor drives the flow guide impeller 4 to rotate to do work, the fuel sucked by the lower end pump does work, and the fuel sucked from the lower end has certain speed and pressure. The fuel sucked from the lower end is acted by the lower guide vane wheel 4, and the flow direction of the fuel is from being parallel to the rotation axis of the fuel supply pump to being perpendicular to the rotation axis, and the fuel is guided by the guide vanes in the lower guide vane shell 2, so that the fuel can smoothly flow into the annular flow passage cavity. The flow-around cavity outside the volute of the upper pump is connected with the flow-through cavity, and fuel entering from the lower end flows to the converging cavity in the integrated inlet pipe 9 of the upper pump after passing through the flow-through cavity and the flow-around cavity. The upper pump sucks fuel from the upper part of the fuel tank through the upper inlet valve 11, the motor rotates to drive the inducer 10 to rotate, and the fuel sucked from the upper end is acted on, so that the fuel sucked from the upper end has a certain speed and pressure, and the fuel sucked from the upper end flows into the converging cavity, is mixed with the fuel sucked from the lower end in the converging cavity, and then flows into the main impeller 8 together. The main impeller 8 is a main acting component of the fuel supply pump, after the fuel flowing into the main impeller is pressurized and accelerated, the fuel flows into a volute in the upper pump, the inner cavity of the volute is a spiral cavity with continuously increased sectional area, and the fuel flowing into the spiral cavity can be converted into energy and converted into pressure energy, so that the fuel meeting the pressure requirement of an airplane is obtained at the outlet of the fuel supply pump. When the fuel in the aircraft fuel tank is insufficient and only one end of the fuel supply pump absorbs the fuel, other working principles are unchanged except that the fuel at only one end in the converging cavity flows in. Because the lower guide vane wheel 4, the inducer 10 and the main vane wheel 8 rotate synchronously, when the oil supply pump only has one end for absorbing oil, one end exposed out of the fuel oil does work due to the rotation of the rotating wheel, the fuel oil absorbed from one end immersed in the fuel oil can be blocked from passing, and the condition of leakage from one end exposed out of the fuel oil can not be caused.
Example two
Referring to fig. 1, a double-ended fuel feed pump without a communication pipe is provided with an upper inlet, a lower inlet, an outlet and a multifunctional integrated housing, and without an upper and lower fuel communication pipe structure of a conventional double-ended pump device. The conventional double-end pump device is provided with upper and lower fuel communication pipes on one side of a motor mounting housing due to functional requirements, and is connected to an inlet or an outlet of the upper and lower fuel pumps so that fuel at one end can reach an inlet or an outlet at the other end through the communication pipes, and then flows through an impeller together with fuel at the other end to continue to be pressurized or flows out of the device together. In the invention, the multifunctional integrated shell is adopted, the shell not only provides an installation platform for other parts in the device, but also forms upper and lower end fuel oil connecting channels in the shell, an external communicating pipeline structure is omitted on the premise of complete functions of the device, and the size space of the device is saved.
Referring to fig. 2, a double-end oil feed pump without a communication pipeline comprises a handle 1, a lower guide vane housing 2, a sealing cylinder 3, a lower guide vane 4, a motor 5, an integrated housing 6, an upper guide vane housing 7, a main impeller 8, an integrated inlet pipe 9, an inducer 10 and an upper inlet valve 11. The two ends of the motor 5 extend out of the rotating shaft, the upper end shaft is sequentially connected with an inducer 10 and a main impeller 8, the lower end shaft is connected with a lower guide impeller 4, and the impellers can rotate along with the rotating shaft of the motor through key connection. The outer parts of impellers at two ends of the motor are respectively connected with an upper guide vane shell 7 and a lower guide vane shell 2, and the upper guide vane shell 7 is connected with an integrated inlet pipe 9. All the components are arranged in the integrated shell 6, the upper end of the integrated shell 6 is connected with an upper end inlet valve 11, a sealing cylinder 3 is arranged in an inner cavity of the lower end, and the handle 1 is positioned on the bottom end surface of a product. The double-end oil supply pump adopts the multifunctional integrated shell 6, not only provides a mounting platform for other components, but also provides a specific flow passage for a fuel oil working medium to bypass a volute area, thereby avoiding a connecting pipeline structure of the upper end and the lower end of the double-end pump and saving the size, the volume and the weight of a product.
The integrated shell 6 is used for a double-end pump structure and comprises a product mounting flange, a lower guide vane shell mounting flange, an overflow cavity, a flow around cavity, an upper end inlet valve mounting flange, a volute and the like. A mounting structure for a flange connection device on an aircraft. The lower vane housing mounting flange is connected with the lower vane housing 2. The overcurrent cavity is positioned outside the motor and is an annular space structure formed by the inner cavity surface of the integrated shell 6 and the outer shape surface of the motor shell, as shown in figure 3, the inner diameter of the overcurrent cavity is larger than the outer diameter of the motor shell, and because the structures such as motor supporting ribs, mounting lugs and the like are arranged in the overcurrent cavity, in order to reduce the flow resistance of fuel in the overcurrent cavity, the overcurrent area (cross-sectional area) of the overcurrent cavity is recommended to be (1.5-2) times of the fuel inlet area of the lower pump; the bypass chamber must bypass the volute structure in order to communicate with the upper pump. A flow-around chamber structure is thus provided outside the volute. Because the scroll structure is larger than the size of the through-flow chamber, in order to reduce the overall size of the integrated housing 6, the flow-around chamber structure must be located at the minimum of the scroll structure, i.e., at the beginning of the spiral structure, see fig. 4. The lower end of the flow-around cavity is connected with the flow-through cavity, the upper end is connected with the outlet of the inducer 10, and the fuel oil at the upper end and the lower end is converged at the outlet of the inducer 10. The cross section of the flow-around cavity is in a flat annular band shape, the flow-around area of the flow-around cavity is gradually reduced according to the structural characteristics of the volute, the minimum flow-around area is reached at the middle section of the volute, and then the flow-around area is gradually enlarged. In order not to affect the overall flow resistance of the product, the minimum area of the bypass cavity is recommended to be (1-1.2) times the area of the fuel inlet of the lower end pump. The area of the part is overlarge, the size of the flow surrounding cavity is enlarged, and the outline size of the integrated shell is increased; the area of the part is too small, so that the flow resistance of the fuel at the lower end can be increased, and the working performance of the product is reduced. The bypass cavity protrudes out of the housing and the surface of the volute, but must not exceed the bottom product mounting flange, otherwise, the double-ended pump may interfere with other products in the oil tank due to the large size space at the location when installed on the machine.
The integrated shell 6 is used for a double-end oil supply pump device, only one volute is adopted in the device, the flow distribution ratio of the upper end and the lower end of the device is generally 1/4-4 according to the oil supply requirement of an airplane, the volute is positioned at one end with larger flow, most of fuel can flow out of the device through a shorter channel, less fuel flows through a longer distance, and the working efficiency of the device is improved. Because the bypass chamber is located outside the volute, the bypass chamber is also located at the end of the device where the flow is greater.
The inner cavity of the integrated shell 6 is of a stepped annular cavity structure, and is respectively connected with the sealing ring 3, the lower guide vane shell 2, the motor 5 supporting ribs, the upper guide vane shell 7, the integrated inlet pipe 9 and the upper end inlet valve 11 from the lower end to the upper end, so that the coaxiality of each stepped annular surface is recommended to be not lower than phi 0.02mm and worst not lower than phi 0.05mm for the convenience of installation.
The integrated shell 6 is provided with a sealing area between the integrated shell and the lower guide vane shell 2 and the integrated inlet pipe 9, so that pressurized fuel in the inner cavity is isolated from the fuel inlets at the upper end and the lower end respectively. The 0-type circular section sealing rubber ring is adopted, and the oil pressure of the fuel system is relatively low, so that the compression amount of the rubber ring is recommended to be 8% -20%.
The integrated shell 6 is formed by casting, the material is recommended to cast aluminum alloy, and cast steel is not recommended to be used for manufacturing in the field of aviation fuel pumps. With the innovation of the machining method, the integrated housing 6 can also be molded using additive manufacturing.
Because the weight of the motor occupies a relatively large area in the double-ended pump device, for the stability of the structure and the reliability of the operation of the device, a support rib is arranged on the annular surface of the shell of the motor 5, and the motor can swing sideways when receiving the lateral force through the support rib support device. The number of the supporting ribs is recommended to be (3-6), the width of the supporting ribs is generally (8-15) mm, the axial length is recommended to be not less than 20mm, the outer edges of the supporting ribs are cambered surfaces, and the supporting ribs are matched with the inner cavity of the integrated shell 6.
Referring to fig. 5 and 6, the integral inlet pipe 9 is an integrated structure of an inlet pipe, a confluence cavity and an oil pump port on a product. An inducer 10 is arranged in the inlet pipe to provide an oil inlet passage for the upper pump; the oil pump port is connected with the main impeller 8, and the profile of the outlet edge profile of the oil pump port is consistent with the profile of the main impeller 8 axial projection drawing cover plate, so that the gap between the oil pump port and the main impeller cover plate profile is kept uniform, the consistency of the output pressure of the product is ensured, and the axial installation size of the product is saved. The gap is recommended to be (0.2-0.4) mm. A confluence cavity is arranged between the inlet pipe and the oil pump port and is an upper end and lower end fuel confluence area, and a fuel circulation window is arranged on the wall surface of the confluence cavity area, and the window is recommended to be of a circular structure because the circular window is better in stress, and a square window can be adopted when a larger circulation area is needed; the number of the windows is (4-12), the circumferences of the windows are uniformly distributed, the area of the windows is not lower than the minimum area of the bypass cavity in order not to increase the flow resistance of the fuel, and the area of the windows is recommended to be (1-2) times of the area of the fuel inlet of the lower pump.
Referring to fig. 7, the lower inducer 4 is an integrated body of inducer and mixed flow impeller, and the inlet is in inducer form, so that cavitation at the inlet of the lower pump can be prevented; the outlet is in a mixed flow impeller shape, so that the flow direction of the fuel is turned to the periphery, and the flow guide of the guide vane and the flow direction of the fuel are convenient to flow to the converging cavity. Because the fuel flowing through the lower pump can do work through the repressurization of the main impeller 8, the lower guide vane 4 does not need very high pressurizing capacity, and therefore, the outer diameter of the outlet of the lower guide vane 4 is smaller than the diameter of the inlet, the blade outlet and the lower guide vane shell 2 do not need to form a fit, and the design and the processing of the device are simplified.
Referring to fig. 8, in order to reduce the flow resistance, the fuel flowing through the lower pump is guided to converge into the converging cavity, the lower guide vane housing 2 is provided with guide vanes outside the lower guide vane impeller 4, the bending direction of the guide vanes is opposite to that of the lower guide vane impeller, the guide vanes are generally (4-9) sheets, the number of the guide vanes and the number of the guide vane impeller blades are prime numbers, and resonance is prevented.
The sealing cylinder 3 is circular, the outer diameter is matched with the corresponding installation inner diameter of the integrated shell 6, the middle section is provided with a hole, the fuel at the lower end flows into the product through the hole at the middle section, the axial length of the hole at the middle section is determined according to the working flow of the pump at the lower end, and the area of the hole at the middle section is not smaller than 2 times of the area of the fuel inlet at the lower end. The perforated ring surface is sunken relative to the outer diameter of the sealing cylinder 3, a band-shaped filter screen is arranged in the sunken area, and the sunken depth dimension is larger than the thickness of the filter screen, so that the filter screen cannot protrude out of the outer diameter of the sealing cylinder 3, and the installation is convenient.
Claims (9)
1. The utility model provides a no double-end fuel feed pump of intercommunication pipeline, its characterized in that, including handle (1), lower stator casing (2), seal cartridge (3), lower impeller (4), motor (5), integrated casing (6), go up stator casing (7), main impeller (8), integral type import pipe (9), inducer (10) and upper end import valve (11), wherein:
the integrated shell (6) is used for a double-end pump structure and comprises a double-end oil supply pump mounting flange, a lower guide vane shell mounting flange, an overflow cavity, a bypass cavity, an upper end inlet valve mounting flange and a volute; the overcurrent cavity is positioned outside the motor, the inner diameter of the overcurrent cavity is larger than the outer diameter of the motor shell, and the overcurrent area formed in the middle of the overcurrent cavity is 1.5-2 times of the area of the fuel inlet of the lower pump; the flow-around cavity is positioned outside the volute chamber and at the initial position of the volute spiral structure, the lower end of the flow-around cavity is connected with the flow-through cavity, the upper end of the flow-around cavity is connected with the outlet of the inducer (10), the cross section of the flow-around cavity is in a flat annular shape, and the flow-through area at the minimum position of the flow-around cavity is 1-1.2 times of the area of the fuel inlet of the lower pump; the bypass cavity protrudes out of the surface of the bypass cavity shell and the volute, but cannot exceed the bottom product mounting flange;
the lower guide vane shell (2), the sealing cylinder (3), the lower guide vane impeller (4), the motor (5), the upper guide vane shell (7), the main impeller (8), the integrated inlet pipe (9) and the inducer (10) are arranged in the integrated shell (6), the upper end of the integrated shell (6) is connected with the upper end inlet valve (11), the sealing cylinder (3) is arranged in the inner cavity of the lower end of the integrated shell (6), and the handle (1) is positioned on the bottom end surface of a product;
both ends of the motor (5) extend out of the rotating shafts, an inducer (10) and a main impeller (8) are sequentially connected to the upper end shaft, and a lower guide impeller (4) is connected to the lower end shaft; the outer parts of impellers at two ends of the motor are respectively connected with an upper guide vane shell (7) and a lower guide vane shell (2), and the upper guide vane shell (7) is connected with an integrated inlet pipe (9).
2. The double-end oil supply pump without communication pipeline according to claim 1, wherein the integrated housing (6) is used for the double-end oil supply pump device, only one volute is adopted, the flow distribution ratio of the upper end and the lower end is 1/4-4, the volute is positioned at one end with larger flow, and the bypass cavity is positioned outside the volute and also positioned at one end with larger flow.
3. The double-end oil supply pump without communicating pipelines according to claim 1, wherein the inner cavity of the integrated shell (6) is of a stepped annular cavity structure, and is respectively connected with the sealing ring (3), the lower guide vane shell (2), the motor (5) supporting rib, the upper guide vane shell (7), the integrated inlet pipe (9) and the upper inlet valve (11) from the lower end to the upper end, and the coaxiality of each stepped annular surface is not lower than phi 0.02mm.
4. The double-ended fuel feed pump without communication line according to claim 1, wherein the integrated housing (6) is provided with a sealing area between the integrated inlet pipe (9) and the lower guide vane housing (2), so that pressurized fuel in the inner cavity is isolated from the upper and lower end fuel inlets respectively; a sealing rubber ring with a 0-shaped circular section is adopted, and the compression amount of the rubber ring is 8% -20%.
5. The double-end oil supply pump without the communication pipeline according to claim 1, wherein the annular surface of the shell of the motor (5) is provided with 3-6 supporting ribs, the width of each supporting rib is 8-15 mm, the axial length is recommended to be not less than 20mm, and the outer edge of each supporting rib is an arc surface and is matched with the inner cavity of the integrated shell (6).
6. The double-end oil supply pump without the communication pipeline according to claim 1, wherein the integrated inlet pipe (9) is an integrated structure of an upper inlet pipe, a confluence cavity and an oil pump port of the double-end oil supply pump without the communication pipeline, and an inducer (10) is arranged in the inlet pipe to provide an oil inlet channel for the upper pump; the oil pump port is connected with the main impeller (8), the profile of the outlet edge of the oil pump port is consistent with the profile of the cover plate of the projection drawing of the axial surface of the main impeller (8), so that the gap between the oil pump port and the profile of the cover plate of the main impeller is kept uniform, and the gap range is 0.2-0.4 mm; a converging cavity is arranged between the inlet pipe and the oil pump port and is an upper end and lower end fuel converging area, a fuel circulating window is formed in the wall surface of the converging cavity area, the fuel circulating window adopts a circular structure, a square window is adopted when a larger circulating area is needed, and the area of the formed window is not lower than the minimum area of the bypass cavity; the area of the fuel oil circulation window is 1-2 times of the area of the fuel oil inlet of the lower end pump.
7. The double-end oil feed pump without communicating pipelines according to claim 1, wherein the lower guide impeller (4) is an integrated body of an inducer and a mixed flow impeller, the inlet is in the inducer form, the outlet is in the mixed flow impeller form, and the outer diameter of the outlet of the lower guide impeller (4) is smaller than the diameter of the inlet.
8. The double-end oil feed pump without communication pipelines according to claim 1, wherein the lower guide vane shell (2) is provided with guide vanes outside the lower guide vane wheel (4), the bending direction of the guide vanes is opposite to that of the lower guide vane wheel, the guide vanes are generally 4-9 pieces, and the number of the guide vanes and the number of the guide vane wheel blades are prime numbers.
9. The double-end oil supply pump without the communication pipeline according to claim 1, wherein the sealing cylinder (3) is annular, the outer diameter of the sealing cylinder is matched with the corresponding installation inner diameter of the integrated shell (6), the middle section is provided with a hole, the fuel at the lower end flows into the double-end oil supply pump without the communication pipeline through the hole at the middle section, the axial length of the hole at the middle section is determined according to the working flow of the pump at the lower end, and the area of the hole is not smaller than 2 times of the area of the fuel inlet at the lower end; the perforated ring surface is sunken relative to the outer diameter of the sealing cylinder (3), a band-shaped filter screen is arranged in the sunken area, and the sunken depth dimension is larger than the thickness of the filter screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791088.9A CN117759543A (en) | 2023-12-25 | 2023-12-25 | Double-end oil supply pump without communication pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791088.9A CN117759543A (en) | 2023-12-25 | 2023-12-25 | Double-end oil supply pump without communication pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117759543A true CN117759543A (en) | 2024-03-26 |
Family
ID=90321709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311791088.9A Pending CN117759543A (en) | 2023-12-25 | 2023-12-25 | Double-end oil supply pump without communication pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117759543A (en) |
-
2023
- 2023-12-25 CN CN202311791088.9A patent/CN117759543A/en active Pending
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