CN112833005A - Internal gearing variable gear pump - Google Patents
Internal gearing variable gear pump Download PDFInfo
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- CN112833005A CN112833005A CN202110070411.8A CN202110070411A CN112833005A CN 112833005 A CN112833005 A CN 112833005A CN 202110070411 A CN202110070411 A CN 202110070411A CN 112833005 A CN112833005 A CN 112833005A
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- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 37
- 238000004891 communication Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
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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
- 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
- F04C2/102—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 the two members rotating simultaneously around their respective axes
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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
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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
- F04C14/10—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention belongs to the technical field of pump equipment. In order to realize the variable discharge capacity of the variable gear pump of the internal gearing, the invention discloses a variable gear pump of the internal gearing, comprising a pump body, a driving gear, a driven gear, an inner gear ring and a variable shaft; an oil inlet and an oil outlet are formed in the pump body; the driving gear, the driven gear and the inner gear ring are positioned in the pump body, the driving gear and the driven gear are meshed with the inner gear ring at the same time, and an oil suction cavity and an oil discharge cavity are formed at the meshing position of the driving gear and the inner gear ring and the meshing position of the driven gear and the inner gear ring respectively; the oil suction cavity is communicated with the oil inlet, and the oil discharge cavity is selectively communicated with the oil outlet and the oil inlet; the variable shaft is rotatably connected with the pump body and is positioned among the oil discharge cavity, the oil outlet and the oil inlet so as to control the on-off among the oil discharge cavity, the oil outlet and the oil inlet. The internal meshing variable gear pump can adjust the displacement, meets the use of more working conditions, and has higher use efficiency.
Description
Technical Field
The invention belongs to the technical field of pumps, and particularly relates to an internal meshing variable gear pump.
Background
In the hydraulic field, an internal gear pump has: the internal meshing variable gear pump has the advantages of simple structure, small volume, light weight, few parts, good manufacturability, easy manufacture, convenient maintenance, low price, good self-absorption performance, insensitivity to pollution of oil, difficult seizure or blockage in work engineering, capability of conveying high-viscosity oil and fluid with large consistency and the like, and is widely applied to various hydraulic systems in the industries of aviation machinery, ship machinery, walking transport machinery, construction machinery, engineering machinery, mining machinery, machine tools and the like.
At present, the research on gear pumps at home and abroad has achieved remarkable achievements, for example, the gear pumps are developed in various aspects such as optimization of gear parameters and pump body structures, clearance compensation, oil trapping impact and unloading, noise control and the like, a set of relatively mature solutions is provided, and a substantial solution is not found until the variable problem of the gear pumps is stopped, so that the gear pumps are limited to be widely applied.
Disclosure of Invention
In order to realize the variable discharge capacity of the internal-meshing variable gear pump, the invention provides an internal-meshing variable gear pump. The variable gear pump with internal gearing comprises a pump body, a driving gear, a driven gear, an inner gear ring and a variable shaft; an oil inlet and an oil outlet are formed in the pump body; the driving gear, the driven gear and the inner gear ring are positioned in the pump body, the driving gear and the driven gear are simultaneously in meshed connection with the inner gear ring, and a corresponding oil suction cavity and an oil discharge cavity are respectively formed at the meshing position of the driving gear and the inner gear ring and the meshing position of the driven gear and the inner gear ring; the oil suction cavity is communicated with the oil inlet, and the oil discharge cavity is selectively communicated with the oil outlet and the oil inlet; the variable shaft is rotatably connected with the pump body and is positioned among the oil discharge cavity, the oil outlet and the oil inlet, and the on-off relation among the oil discharge cavity, the oil outlet and the oil inlet is controlled in the reciprocating rotation process of the variable shaft relative to the pump body.
Preferably, the variable shaft is of a cylindrical structure, the oil outlet is located inside the variable shaft, the oil inlet and the oil discharge cavity are located outside the variable shaft, and a connecting hole penetrating through the wall thickness of the variable shaft is formed in the variable shaft; the connecting hole is selectively communicated with the oil outlet, the oil inlet and the oil discharge cavity along with the rotation of the variable shaft.
Further preferably, the outer surface of the variable shaft is provided with a connecting groove, and the connecting groove is arranged along the circumferential direction of the variable shaft and is connected with the connecting hole; the oil discharge cavity, the oil inlet and the oil outlet extend to the plane where the connecting groove is located, and the length of the connecting groove in the circumferential direction of the variable shaft is not less than the length of the connecting groove in the circumferential direction of the variable shaft between the oil discharge cavity corresponding to the driving gear and the oil discharge cavity corresponding to the driven gear.
Preferably, the variable gear pump is provided with a plurality of driven gears; the plurality of driven gears are sequentially in meshing transmission connection with the inner gear ring along the circumferential direction of the inner gear ring, and form a plurality of oil suction cavities and a plurality of oil discharge cavities; the oil outlet is communicated with the oil inlet, and the oil outlet is communicated with the oil inlet.
Preferably, the internal meshing variable gear pump is also provided with a variable driver; the variable driver is connected with the variable shaft to drive the variable shaft to rotate in a reciprocating mode relative to the pump body.
Further preferably, the variable driver is provided with a variable motor; the body of the variable motor is fixedly connected with the pump body, and the output shaft of the variable motor is connected with the variable shaft so as to drive the variable shaft to rotate in a reciprocating manner relative to the pump body.
Further preferably, the outer circumferential surface of the variable shaft is provided with transmission teeth, and the transmission teeth are in tooth meshing transmission connection with the output shaft of the variable motor through gears.
Preferably, the driving gear is in a gear shaft structure.
Preferably, the variable shaft and the pump body are detachably connected.
Preferably, the driving gear, the driven gear and the inner gear ring are detachably connected with the pump body.
Compared with the conventional crescent gear pump, the crescent variable gear pump has the following beneficial technical effects:
1. in the internal meshing variable gear pump, the variable shaft capable of rotating in a reciprocating mode relative to the pump body is arranged, and the variable shaft controls the on-off relation between the main oil discharge cavity and the auxiliary oil discharge cavity and the oil outlet and the oil inlet respectively, so that in the process of outputting high-pressure media when the internal meshing variable gear pump normally works, the flow areas between the main oil discharge cavity and the auxiliary oil discharge cavity and the oil outlet and the oil inlet respectively can be adjusted by means of the reciprocating rotation of the variable shaft relative to the pump body, the flow directions of the high-pressure media in the main oil discharge cavity and the auxiliary oil discharge cavity are changed, the displacement is adjusted, and the variable displacement control effect on the internal meshing variable gear pump is obtained.
2. In the internal-meshing variable gear pump, a plurality of driven gears are arranged to be in meshing transmission connection with an inner gear ring, a driving gear is formed to drive the inner gear ring and the driven gears to be in meshing transmission connection simultaneously, a variable shaft is provided with a connecting groove and a connecting hole, and the connecting groove and the connecting hole are driven to be respectively communicated and changed with different oil discharge cavities, oil outlets and oil inlets in the reciprocating rotation process of the variable shaft relative to a pump body, so that the communication relation between each oil discharge cavity and the oil inlets and the oil outlets is controlled. Therefore, by controlling the reciprocating rotation amount of the variable shaft relative to the pump body, the communication relation between different oil discharge cavities and the oil inlet and the oil outlet can be controlled, so that the displacement of the internally meshed variable gear pump is divided into multiple gears, the multi-gear control effect of different displacements of the internally meshed variable gear pump is realized, and the precision and the range of variable control of the internally meshed variable gear pump are improved.
Drawings
FIG. 1 is a schematic cross-sectional structural diagram of an inside engaged variable gear pump in the present embodiment under a maximum displacement condition;
FIG. 2 is a schematic cross-sectional view of the crescent variable gear pump of the present embodiment at maximum displacement, taken along the direction M-M in FIG. 1;
FIG. 3 is a schematic cross-sectional view of the crescent variable gear pump of the present embodiment at maximum displacement, taken along the direction N-N in FIG. 1;
FIG. 4 is a schematic cross-sectional view of the crescent variable gear pump of the present embodiment at driven gear displacement, taken along the direction N-N in FIG. 1;
FIG. 5 is a schematic cross-sectional view of the crescent variable gear pump of the present embodiment taken along the direction N-N in FIG. 1 at the driving gear displacement;
fig. 6 is a schematic cross-sectional view of the crescent variable gear pump of the embodiment along the direction of N-N in fig. 1 at zero displacement.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to 3, the variable gear pump with internal gear of the present embodiment includes a pump body 1, a drive gear 2, a driven gear 3, an internal gear 4, and a variable shaft 5.
An oil inlet 11 connected with an external low-pressure pipeline and an oil outlet 12 connected with an external high-pressure pipeline are arranged on the pump body 1. The driving gear 2, the driven gear 3 and the inner gear ring 4 are located in the same plane inside the pump body 1, and the driving gear 2 and the driven gear 3 are simultaneously in meshing transmission connection with the inner gear ring 4. At this time, a main oil suction chamber 21 and a main oil discharge chamber 22 are respectively formed with the pump body 1 at both sides where the driving gear 2 and the ring gear 4 form the engagement position, a sub oil suction chamber 31 and a sub oil discharge chamber 32 are respectively formed with the pump body 1 at both sides where the driven gear 3 and the ring gear 4 form the engagement position, and the main oil suction chamber 21 and the sub oil suction chamber 31 are simultaneously kept communicated with the oil inlet 11, and the main oil discharge chamber 22 and the sub oil discharge chamber 32 are respectively formed in selective communication with the oil inlet 11 and the oil outlet 12. The variable shaft 5 is connected with the pump body 1 in a relative rotation mode and is located among the main oil drainage cavity 22, the auxiliary oil drainage cavity 32, the oil inlet 11 and the oil outlet 12 so as to respectively control the oil path on-off relation among the main oil drainage cavity 22, the auxiliary oil drainage cavity 32, the oil inlet 11 and the oil outlet 12.
At the moment, when the driving gear is driven to rotate, the driven gear can be driven to synchronously rotate through the inner gear ring, so that low-pressure media in the main oil suction cavity and the auxiliary oil suction cavity are compressed and boosted under the rotating action of the driving gear, the driven gear and the inner gear ring respectively and are brought into the corresponding main oil discharge cavity and the corresponding auxiliary oil discharge cavity, and then flow to the oil outlet, and the output of high-pressure media is realized. In the process, the variable shaft is controlled to rotate relative to the pump body, so that the communication relation between the main oil drainage cavity and the auxiliary oil drainage cavity and between the oil inlet and the oil outlet can be changed, the flow direction of media in the main oil drainage cavity and the auxiliary oil drainage cavity is changed, the quantity of the media flowing to the oil outlet is adjusted, and the displacement adjustment of the internal meshing variable gear pump is achieved.
When the variable shaft rotates relative to the pump body to the main oil discharge cavity and the auxiliary oil discharge cavity and is communicated with the oil outlet, high-pressure media in the main oil discharge cavity and the auxiliary oil discharge cavity are all converged to the oil outlet to be output, so that the internal meshing variable gear pump is kept in a maximum displacement operation state; when the variable shaft rotates relative to the pump body until the main oil discharge cavity is communicated with the oil inlet, the main oil suction cavity is directly communicated with the main oil discharge cavity, so that the driving gear idles and loses output of high-pressure media; when the variable shaft rotates relative to the pump body until the secondary oil discharge cavity is communicated with the oil inlet, the secondary oil suction cavity is directly communicated with the secondary oil discharge cavity, so that the driven gear forms idle rotation and loses output of high-pressure media; when the variable shaft rotates relative to the pump body to the main oil discharge cavity and the auxiliary oil discharge cavity and is communicated with the oil inlet, the main oil suction cavity is directly communicated with the main oil discharge cavity and the auxiliary oil suction cavity is directly communicated with the auxiliary oil discharge cavity, so that the driving gear and the driven gear simultaneously enter idle rotation, the whole internal meshing variable gear pump stops outputting high-pressure media, and the displacement adjustment of the internal meshing variable gear pump is realized.
As shown in fig. 3, in the present embodiment, the variable shaft 5 has a cylindrical structure, and the oil outlet 12 is located on the pump body 1 inside the variable shaft 5, the oil inlet 11, the main oil drain chamber 22, and the auxiliary oil drain chamber 32 are located on the pump body 1 outside the variable shaft 5, while the variable shaft 5 is provided with the first connection hole 51, and the first connection hole 51 penetrates through the wall thickness of the variable shaft 5.
At the moment, the communication relation between the oil outlet and the main oil discharge cavity and between the auxiliary oil discharge cavity and the oil inlet through the first connecting hole is changed by controlling the reciprocating rotation of the variable shaft relative to the pump body. When the first connecting hole rotates along with the variable shaft to a position for communicating the main oil discharge cavity with the oil outlet, the internal meshing variable gear pump outputs high-pressure medium according to the discharge capacity of the driving gear; when the first connecting hole rotates along with the variable shaft to a position where the oil discharge cavity is communicated with the oil outlet, the internal meshing variable gear pump outputs high-pressure medium according to the displacement of the driven gear; when the first connecting hole rotates to a position for communicating the oil inlet with the oil outlet along with the variable shaft, the internal meshing variable gear pump stops outputting the high-pressure medium.
In the present embodiment, as shown in fig. 3, the main oil drainage chamber 22, the slave oil drainage chamber 32 and the oil inlet 11 are respectively guided to the same cross-sectional position in the pump body 1 by the auxiliary oil passages, and the main oil drainage chamber 22 and the slave oil drainage chamber 32 are arranged at an angle of 180 degrees in the direction of rotation of the variable shaft 5, and at this time, a second connection hole 52 and a connection groove 53 are further provided in the variable shaft 5. Wherein a connecting groove 53 is provided on the outer circumferential surface of the variable shaft 5 in the direction in which the variable shaft 5 rotates, the distance of the connecting groove 53 in the direction in which the variable shaft 5 rotates is equal to the distance of the main drain chamber 22 and the slave drain chamber 32 in the direction in which the variable shaft 5 rotates, the connecting groove 53 is kept in communication with the second connecting hole 52, and when the connecting groove 53 rotates with the variable shaft 5 to communicate the main drain chamber 22 and the slave drain chamber 32, the second connecting hole 52 is brought into communicating relation with the oil outlet 12.
At the moment, along with the rotation of the variable shaft relative to the pump body, when the connecting groove rotates to connect the main oil discharge cavity and the auxiliary oil discharge cavity, the second connecting hole is simultaneously communicated with the oil outlet, so that high-pressure media in the main oil discharge cavity and the auxiliary oil discharge cavity can simultaneously flow into the oil outlet, and the operation of the internal meshing variable gear pump under the maximum displacement working condition of the sum of the displacement of the driving gear, the displacement of the inner gear ring and the displacement of the driven gear is realized.
Similarly, in other embodiments, the number of the driven gears can be adjusted, and according to the distribution positions among the plurality of oil discharge cavities and the position relationship among the plurality of oil discharge cavities and the oil inlet, the position relationship between the connecting groove and the second connecting hole is adjusted, so that the condition that high-pressure media in the plurality of oil discharge cavities are simultaneously drained to the oil outlet is met, and the internal gear pump is enabled to operate under the maximum discharge capacity working condition of the sum of the discharge capacity of the driving gear and the plurality of driven gears.
In addition, in other embodiments, according to the structural form and size of the pump body, the main oil drainage cavity, the auxiliary oil drainage cavity and the oil inlet can be drained to different cross-section positions in the pump body by means of the auxiliary oil path, so that the communication relation among the main oil drainage cavity, the auxiliary oil drainage cavity and the oil inlet and the communication relation among the main oil drainage cavity, the auxiliary oil drainage cavity, the oil inlet and the oil outlet are controlled by respectively arranging connecting grooves with different communication relations among the different cross-section positions of the variable shaft.
As shown in fig. 1, the variable gear pump of the present embodiment further includes a variable motor 61 and a gear 62, and the variable shaft 5 has transmission teeth on its outer circumferential surface. Wherein, the body of the variable motor 61 is fixedly connected with the pump body 1, and the gear 62 is fixed on the output shaft of the variable motor 61 and forms tooth meshing transmission connection with the transmission gear on the variable shaft 5. Therefore, the variable drive consisting of the variable motor and the gear can drive the variable shaft to rotate in a reciprocating way relative to the pump body, so that the displacement adjustment of the internal meshing variable gear pump is controlled.
In other embodiments, the variable shaft may be driven to rotate back and forth by the reciprocating motion of the electric pole driving rack in the linear direction, by the rack instead of the gear, according to the design and installation space. Even, a variable motor, such as a stepping motor, can be directly selected for driving and controlling the reciprocating rotation of the variable shaft, so as to drive the variable shaft to perform precise reciprocating rotation relative to the pump body.
Referring to fig. 1 and 2, in the present embodiment, the driving gear 2, the driven gear 3 and the ring gear 4 are detachably connected to the pump body 1 by means of a movable assembly, and are positioned by means of the cover plate 13 and the fixing plate 14. Meanwhile, the cover plate 13 and the fixing plate 14 form an oil discharge cavity and an oil suction cavity together with the pump body 1, and the cover plate 13 and the fixing plate 14 are detachably and fixedly connected with the pump body 1 in a bolt connection mode.
At the moment, the effect of quickly dismounting and replacing the driving gear, the driven gear and the inner gear ring can be achieved by dismounting and mounting the cover plate and the fixing plate. Like this, not only can be according to the requirement of different operating modes, quick replacement driving gear, driven gear and ring gear to reach different high-pressure medium output effects, improve the availability factor of this gear pump, but also can carry out quick replacement to wearing and tearing inefficacy driving gear, driven gear or ring gear in the use, thereby guarantee whole crescent variable gear pump continuous operation, improve this crescent variable gear pump's operational reliability.
As shown in fig. 1, in the present embodiment, the variable shaft 5 is also detachably and fixedly connected to the pump body 1, that is, the variable shaft 5 is fixedly positioned by the detachable connecting plate 15 after being inserted into the pump body 1. Like this, just can the variable axle that different spread grooves and connecting hole were equipped with by quick replacement to reach different variable control effects, improve this crescent variable gear pump's variable control variety.
Referring to fig. 1, in the present embodiment, the driving gear 2 is a gear shaft, that is, the driving gear 2 is directly provided with a driving shaft for connecting an external driving device, so that the number of transmission components can be reduced, and the mechanical transmission efficiency can be improved. Similarly, in other embodiments, the external driving device and the driving gear may be driven and connected in a structural form of an independent driving shaft according to the use and design requirements, and the driving shaft and the driving gear may be detachably and fixedly connected. Like this, just can be according to the drive shaft that different use operating mode quick replacement has different structural style, spline shaft or flat key axle for example to satisfy and be connected with the external drive arrangement of different structural style, guarantee this internal engagement variable gear pump's normal use.
Referring to fig. 1 to 6, when the internal gear pump of this embodiment outputs a high-pressure medium, first, an external low-pressure pipeline is connected to an oil inlet 11, and an external high-pressure pipeline is connected to an oil outlet 12, and then an external driving device is started to drive a driving gear 2 to rotate, so that a driven gear 3 is driven to rotate synchronously via an inner gear ring 4, a negative pressure is formed between a main oil suction cavity 21 and a secondary oil suction cavity 31, and the low-pressure medium at the oil inlet 11 is introduced, and further, the low-pressure medium is compressed and worked under the rotation action of the driving gear 2, the driven gear 3 and the inner gear ring 4, and is brought into a corresponding main oil discharge cavity 22 and a corresponding secondary oil discharge cavity 32, and then flows to the oil outlet 12, so as to output the high.
During the operation of the internal-meshing variable gear pump, the variable motor 61 is started to drive the variable shaft 5 to rotate relative to the pump body 1 when the displacement is adjusted, so that the communication relationship between the main oil discharge cavity and the auxiliary oil discharge cavity and the oil inlet and the oil outlet is changed.
When the variable displacement shaft 5 is rotated to the position shown in fig. 3, the connection groove 53 communicates the main oil discharge chamber 22 and the sub oil discharge chamber 32, and the second connection hole 52 communicates with the oil outlet 12, while the first connection hole 51 is in the short-circuited position, i.e., the first connection hole 51 does not communicate with both the oil inlet 11 and the oil outlet 12. Thus, the high-pressure medium in the main oil discharge chamber 22 and the high-pressure medium in the oil discharge chamber 32 all flow to the oil outlet 12 through the connecting groove 53 and the second connecting hole 52, so that the variable gear pump with internal meshing is kept in operation under the maximum displacement working condition of the sum of the displacement of the driving gear, the displacement of the driven gear and the displacement of the internal gear ring section between the driving gear and the driven gear.
When the variable displacement shaft 5 is rotated to the position shown in fig. 4, the connecting groove 53 communicates the main oil discharge chamber 22 with the oil inlet 11, the second connecting hole 52 is in the short-circuited position, i.e., the second connecting hole 52 is not communicated with the oil outlet 12, and the first connecting hole 51 is turned to a position to communicate the slave oil discharge chamber 32 with the oil outlet 12. Thus, the main oil discharge chamber 22 communicates with the oil inlet 11 to bring the driving gear 2 into an idling state, and at this time, the high-pressure medium flowing into the main oil discharge chamber 22 through the driving gear 2 and flowing into the main oil discharge chamber 22 through the inner ring section 42 between the oil suction chamber 31 and the driving gear 2 all flows back into the oil inlet 11 through the connecting groove 53, and the high-pressure medium flowing into the oil discharge chamber 32 through the driven gear 3 and flowing into the oil discharge chamber 32 through the main oil suction chamber 21 and the inner ring section 41 between the driven gear 3 all flows to the oil outlet 12 through the first connecting hole 51, so that the variable internal gear pump is switched to operate under a displacement condition of the sum of the displacement of the driven gear and the displacement of the inner ring section between the driving gear.
When the variable displacement shaft 5 is rotated to the position shown in fig. 5, the connecting groove 53 will communicate from the oil discharge chamber 32 and the oil inlet 11, the second connecting hole 52 is in the short-circuited position, i.e., the second connecting hole 52 is not communicated with the oil outlet 12, and the first connecting hole 51 is turned to the position communicating the main oil discharge chamber 22 and the oil outlet 12. Thus, the driven gear 3 is brought into an idling state by communicating the oil inlet 11 with the oil discharge chamber 32, at which time the high-pressure medium flowing into the oil discharge chamber 32 through the driven gear 3 and flowing into the oil discharge chamber 32 through the main oil suction chamber 21 and the ring gear section 41 between the main oil suction chamber 21 and the driven gear 3 all flows back into the oil inlet 11 through the connecting groove 53, and the high-pressure medium flowing into the main oil discharge chamber 22 through the main oil suction chamber 21 and flowing into the main oil discharge chamber 22 through the ring gear section 42 between the oil suction chamber 31 and the driving gear 3 all flows to the oil outlet 12 through the first connecting hole 51, so that the internal variable gear pump is switched to operate in a displacement condition of the sum of the driving gear displacement and the ring gear section displacement between the driven.
When the variable displacement shaft 5 is rotated to the position shown in fig. 6, the connection groove 53 simultaneously communicates the main oil drain chamber 22, the slave oil drain chamber 32, and the oil inlet 11, and the first connection hole 51 and the second connection hole 52 are simultaneously in the short-circuited position, i.e., the first connection hole 51 and the second connection hole 52 are simultaneously not communicated with the oil outlet 12. Thus, the high-pressure medium flowing into the main oil discharge chamber 22 and the high-pressure medium flowing from the oil discharge chamber 32 all flow to the oil inlet 11 through the connecting groove 53, so that the driving gear 2 and the driven gear 3 simultaneously enter an idling state, the internal meshing variable gear pump enters a zero-displacement working condition, and the output of the high-pressure medium is stopped.
In the adjusting process, the rotating position of the variable shaft is accurately controlled, namely the rotating angle of the variable shaft is controlled, so that the flow areas of the connecting groove, the main oil drainage cavity, the slave oil drainage cavity and the oil inlet, the flow areas of the first connecting hole, the oil inlet and the oil outlet and the flow areas of the second connecting hole and the oil outlet can be accurately and finely adjusted, and the displacement fine-tuning effect of the internal gearing variable gear pump is achieved.
Claims (10)
1. An internal-meshing variable gear pump is characterized by comprising a pump body, a driving gear, a driven gear, an inner gear ring and a variable shaft; an oil inlet and an oil outlet are formed in the pump body; the driving gear, the driven gear and the inner gear ring are positioned in the pump body, the driving gear and the driven gear are simultaneously in meshed connection with the inner gear ring, and a corresponding oil suction cavity and an oil discharge cavity are respectively formed at the meshing position of the driving gear and the inner gear ring and the meshing position of the driven gear and the inner gear ring; the oil suction cavity is communicated with the oil inlet, and the oil discharge cavity is selectively communicated with the oil outlet and the oil inlet; the variable shaft is rotatably connected with the pump body and is positioned among the oil discharge cavity, the oil outlet and the oil inlet, and the on-off relation among the oil discharge cavity, the oil outlet and the oil inlet is controlled in the reciprocating rotation process of the variable shaft relative to the pump body.
2. An inside engaged variable gear pump according to claim 1, wherein said variable shaft is of a tubular structure, said oil outlet is located inside said variable shaft, said oil inlet and said oil discharge chamber are located outside said variable shaft, and said variable shaft is provided with a connecting hole penetrating the wall thickness thereof; the connecting hole is selectively communicated with the oil outlet, the oil inlet and the oil discharge cavity along with the rotation of the variable shaft.
3. An inside engaged variable gear pump according to claim 2, wherein an outer surface of the variable shaft is provided with a connecting groove which is opened in a circumferential direction of the variable shaft and is kept connected with the connecting hole; the oil discharge cavity, the oil inlet and the oil outlet extend to the plane where the connecting groove is located, and the length of the connecting groove in the circumferential direction of the variable shaft is not less than the length of the connecting groove in the circumferential direction of the variable shaft between the oil discharge cavity corresponding to the driving gear and the oil discharge cavity corresponding to the driven gear.
4. A crescent variable gear pump according to any of claims 1-3, wherein the variable gear pump is provided with a plurality of driven gears; the plurality of driven gears are sequentially in meshing transmission connection with the inner gear ring along the circumferential direction of the inner gear ring, and form a plurality of oil suction cavities and a plurality of oil discharge cavities; the oil outlet is communicated with the oil inlet, and the oil outlet is communicated with the oil inlet.
5. A crescent variable gear pump according to any of claims 1-3, wherein the crescent variable gear pump is further provided with a variable drive; the variable driver is connected with the variable shaft to drive the variable shaft to rotate in a reciprocating mode relative to the pump body.
6. An inside engaged variable gear pump according to claim 5, wherein said variable drive is provided with a variable motor; the body of the variable motor is fixedly connected with the pump body, and the output shaft of the variable motor is connected with the variable shaft so as to drive the variable shaft to rotate in a reciprocating manner relative to the pump body.
7. An internal gear pump according to claim 6, wherein the variable shaft is provided with drive teeth on its outer circumferential surface and is in toothed gearing connection with the output shaft of the variable electric motor via a gear.
8. An internal gear pump according to any of claims 1 to 3, wherein said drive gear is in the form of a gear shaft arrangement.
9. An internal gear pump according to any of claims 1 to 3, wherein said variable shaft is detachably connected to said pump body.
10. An internal gear pump according to any of claims 1 to 3, wherein the drive gear, the driven gear and the internal gear ring are detachably connected to the pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110070411.8A CN112833005A (en) | 2021-01-19 | 2021-01-19 | Internal gearing variable gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110070411.8A CN112833005A (en) | 2021-01-19 | 2021-01-19 | Internal gearing variable gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112833005A true CN112833005A (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110070411.8A Pending CN112833005A (en) | 2021-01-19 | 2021-01-19 | Internal gearing variable gear pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN112833005A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201176930Y (en) * | 2007-05-26 | 2009-01-07 | 吴涛慧 | Gear ring pump |
| JP2009127457A (en) * | 2007-11-21 | 2009-06-11 | Hitachi Ltd | Variable displacement pump |
| JP2011149499A (en) * | 2010-01-21 | 2011-08-04 | Honda Motor Co Ltd | Hydraulic control valve |
| CN208718928U (en) * | 2018-08-13 | 2019-04-09 | 珠海凌达压缩机有限公司 | Compressor and refrigerating system |
| CN111271237A (en) * | 2020-03-06 | 2020-06-12 | 邵玉刚 | Water pump |
-
2021
- 2021-01-19 CN CN202110070411.8A patent/CN112833005A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201176930Y (en) * | 2007-05-26 | 2009-01-07 | 吴涛慧 | Gear ring pump |
| JP2009127457A (en) * | 2007-11-21 | 2009-06-11 | Hitachi Ltd | Variable displacement pump |
| JP2011149499A (en) * | 2010-01-21 | 2011-08-04 | Honda Motor Co Ltd | Hydraulic control valve |
| CN208718928U (en) * | 2018-08-13 | 2019-04-09 | 珠海凌达压缩机有限公司 | Compressor and refrigerating system |
| CN111271237A (en) * | 2020-03-06 | 2020-06-12 | 邵玉刚 | Water pump |
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