CN112628137B - Cycloidal gear pump with high volumetric efficiency and method for improving volumetric efficiency - Google Patents
Cycloidal gear pump with high volumetric efficiency and method for improving volumetric efficiency Download PDFInfo
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- CN112628137B CN112628137B CN202011309666.7A CN202011309666A CN112628137B CN 112628137 B CN112628137 B CN 112628137B CN 202011309666 A CN202011309666 A CN 202011309666A CN 112628137 B CN112628137 B CN 112628137B
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- Prior art keywords
- gear pump
- area
- volumetric efficiency
- cycloid gear
- oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Pumps (AREA)
Abstract
The invention belongs to the technical field of helicopter reducers, and discloses a cycloidal gear pump with high volumetric efficiency and a method for improving the volumetric efficiency. The left molded line and the right molded line of the interstage shell of the cycloid gear pump are asymmetric, so that the oil inlet area is larger than the oil discharge area, the area corresponding to the left molded line is the oil inlet area, and the area corresponding to the right molded line is the oil discharge area. The volumetric efficiency of the cycloidal gear pump is effectively improved, and the working capacity of the cycloidal gear pump is improved.
Description
Technical Field
The invention belongs to the technical field of helicopter reducers, and particularly relates to a cycloidal gear pump with high volumetric efficiency and a method for improving the volumetric efficiency.
Background
The cycloidal gear pump has compact structure, small weight, stable flow, good self-absorption and long service life, so that the cycloidal gear pump is widely applied to the field of domestic aviation. The structural design of the existing cycloidal gear pump is usually to ensure the maximum rotor engagement area, in theory, the rotor engagement area is the maximum as shown in fig. 1, and if the sealing volume can be effectively filled at this time, the volumetric efficiency is the highest. However, in the actual working process of the pump, the time of the oil pumping process is shorter due to the higher rotating speed, the oil inlet cavity is rotated out of the oil inlet area after insufficient oil suction, and the volumetric efficiency of the pump is lower due to insufficient oil suction in the oil inlet cavity. The volumetric efficiency of the pump is less than 30% under specific working conditions, so that the volumetric efficiency of the cycloidal gear pump is effectively improved, which is a current urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a novel cycloidal gear pump structure, which effectively improves the volumetric efficiency of the cycloidal gear pump and the working capacity of the cycloidal gear pump.
In order to solve the technical problems, the invention adopts the following technical scheme:
the technical scheme is as follows:
the utility model provides a high volumetric efficiency cycloid gear pump, the left and right sides molded lines of cycloid gear pump's interstage casing are asymmetric to advance oil zone and be greater than the oil extraction district, and the region that left side molded lines corresponds is advance oil zone, and the region that right side molded lines corresponds is the oil extraction district.
The first technical scheme of the invention is characterized in that:
(1) The meshing area of the inner rotor and the outer rotor of the cycloid gear pump is the largest, and the cycloid gear pump is in an oil inlet state.
(2) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloidal gear pump is smaller than the maximum meshing area of the inner rotor and the outer rotor of the cycloidal gear pump.
(3) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is not less than 70% of the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump.
(4) The positions of left and right molded lines of the interstage shell of the cycloid gear pump determine the positions and the sizes of sealed volume cavities of an inner rotor and an outer rotor of the cycloid gear pump.
The second technical scheme is as follows:
a method for improving volumetric efficiency of a gerotor gear pump, the method being applied to the gerotor gear pump of claim one, the method comprising:
s1, determining left and right molded lines of the asymmetric interstage casings of the cycloid gear pump; the asymmetrical left and right molded lines of the interstage casings enable the oil inlet area to be larger than the oil discharge area,
s2, determining the area of a sealed volume cavity of the cycloid gear pump;
and S3, pumping the lubricating oil from an oil inlet area to an oil discharge area by the cycloidal gear pump.
The second technical proposal of the invention has the characteristics and further improvement that:
(1) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloidal gear pump is smaller than the maximum meshing area of the inner rotor and the outer rotor of the cycloidal gear pump.
(2) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is not less than 70% of the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump.
According to the technical scheme, the effective closed engagement area and the inner rotor and outer rotor engagement time point are determined through a reasonable inter-stage shell molded line structure. The oil suction time of the pump is properly increased, and the proper inner and outer rotor engagement positions and the proper deflection angle of the rotor engagement areas are found, so that the angular position of the molded line of the interstage casing is determined and the molded line of the interstage casing is designed. At the moment, the cycloid gear pump can absorb oil more fully through the effective oil absorption time, and the volumetric efficiency is effectively improved.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a modified front gerotor gear pump;
fig. 2 is a schematic diagram of the internal structure of the improved cycloidal gear pump.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and the specific embodiments.
The embodiment of the invention provides a cycloid gear pump with high volumetric efficiency, as shown in fig. 2, left and right molded lines (the left molded line is shown as a in the figure, the right molded line is shown as b in the figure) of an interstage casing of the cycloid gear pump are asymmetric, so that an oil inlet area is larger than an oil outlet area, an area corresponding to the left molded line is the oil inlet area, and an area corresponding to the right molded line is the oil outlet area.
The further improvement is as follows:
(1) The meshing area of the inner rotor and the outer rotor of the cycloid gear pump is the largest, and the cycloid gear pump is in an oil inlet state.
(2) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloidal gear pump is smaller than the maximum meshing area of the inner rotor and the outer rotor of the cycloidal gear pump.
(3) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is not less than 70% of the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump.
(4) The positions of left and right molded lines of the interstage shell of the cycloid gear pump determine the positions and the sizes of sealed volume cavities of an inner rotor and an outer rotor of the cycloid gear pump.
The embodiment of the invention also provides a method for improving the volumetric efficiency of the cycloidal gear pump, which is applied to the cycloidal gear pump, and comprises the following steps:
s1, determining left and right molded lines of the asymmetric interstage casings of the cycloid gear pump; the left molded line and the right molded line of the interstage casing are asymmetrical, so that the oil inlet area is larger than the oil discharge area;
s2, determining the area of a sealed volume cavity of the cycloid gear pump;
and S3, pumping the lubricating oil from an oil inlet area to an oil discharge area by the cycloidal gear pump.
Further:
(1) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloidal gear pump is smaller than the maximum meshing area of the inner rotor and the outer rotor of the cycloidal gear pump.
(2) The area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is not less than 70% of the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump.
According to the technical scheme, the effective closed engagement area and the inner rotor and outer rotor engagement time point are determined through a reasonable inter-stage shell molded line structure. The oil suction time of the pump is properly increased, and the proper inner and outer rotor engagement positions and the proper deflection angle of the rotor engagement areas are found, so that the angular position of the molded line of the interstage casing is determined and the molded line of the interstage casing is designed. At the moment, the cycloid gear pump can absorb oil more fully through the effective oil absorption time, and the volumetric efficiency is effectively improved.
With the internal structure of the cycloidal gear pump before improvement shown in fig. 1, there is a main problem in that when the cycloidal gear pump is at a higher rotation speed, the oil absorption time is insufficient, and when the oil inlet area cannot be effectively filled, the rotor is already rotated to the oil outlet area to start to drain the lubricating oil. At this time, the volumetric efficiency of the cycloidal gear pump is relatively low, and when the pump rotation speed is 10000r/min, the volumetric efficiency is only 30%.
For the improved cycloidal gear pump structure shown in fig. 2, the main advantages are that: the effective volume of the oil inlet area is increased, the time for sucking the lubricating oil by the cycloidal gear pump is effectively prolonged, the meshing volume is effectively filled, and the pumping oil is more sufficient. At the moment, the lubricating oil can be more sufficiently filled, the volumetric efficiency of the cycloidal gear pump is effectively improved, and when the rotation speed of the pump is 10000r/min, the volumetric efficiency can reach 50%, and the volumetric efficiency of 20% is effectively improved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The cycloid gear pump with high volumetric efficiency is characterized in that left and right molded lines of an interstage shell of the cycloid gear pump are asymmetric, so that an oil inlet area is larger than an oil discharge area, an area corresponding to the left molded line is the oil inlet area, and an area corresponding to the right molded line is the oil discharge area;
the meshing area of the inner rotor and the outer rotor of the cycloid gear pump is in an oil inlet state when the meshing area is maximum;
the area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is smaller than the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump;
the area of the sealed volume cavity of the inner rotor and the outer rotor of the cycloid gear pump is not less than 70% of the maximum meshing area of the inner rotor and the outer rotor of the cycloid gear pump;
the positions of left and right molded lines of the interstage shell of the cycloid gear pump determine the positions and the sizes of sealed volume cavities of an inner rotor and an outer rotor of the cycloid gear pump;
the method for improving the volumetric efficiency of the cycloidal gear pump based on the cycloidal gear pump comprises the following steps:
s1, determining left and right molded lines of the asymmetric interstage casings of the cycloid gear pump; the left molded line and the right molded line of the interstage casing are asymmetrical, so that the oil inlet area is larger than the oil discharge area;
s2, determining the area of a sealed volume cavity of the cycloid gear pump;
and S3, pumping the lubricating oil from an oil inlet area to an oil discharge area by the cycloidal gear pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309666.7A CN112628137B (en) | 2020-11-20 | 2020-11-20 | Cycloidal gear pump with high volumetric efficiency and method for improving volumetric efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309666.7A CN112628137B (en) | 2020-11-20 | 2020-11-20 | Cycloidal gear pump with high volumetric efficiency and method for improving volumetric efficiency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112628137A CN112628137A (en) | 2021-04-09 |
| CN112628137B true CN112628137B (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011309666.7A Active CN112628137B (en) | 2020-11-20 | 2020-11-20 | Cycloidal gear pump with high volumetric efficiency and method for improving volumetric efficiency |
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| CN (1) | CN112628137B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007008265A1 (en) * | 2007-02-20 | 2008-08-21 | Siemens Ag | gerotor |
| EP2567069A4 (en) * | 2010-05-05 | 2014-04-16 | Ener G Rotors Inc | Fluid energy transfer device |
| CN107208627B (en) * | 2015-01-30 | 2019-06-28 | 爱信机工株式会社 | Gear pump and its manufacturing method |
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- 2020-11-20 CN CN202011309666.7A patent/CN112628137B/en active Active
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| CN112628137A (en) | 2021-04-09 |
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