CN109236595B - Multi-row multi-action inner curve rotor driving digital variable radial plunger pump - Google Patents
Multi-row multi-action inner curve rotor driving digital variable radial plunger pump Download PDFInfo
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- CN109236595B CN109236595B CN201811106463.0A CN201811106463A CN109236595B CN 109236595 B CN109236595 B CN 109236595B CN 201811106463 A CN201811106463 A CN 201811106463A CN 109236595 B CN109236595 B CN 109236595B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/047—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders
- F04B1/0474—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with two or more serially arranged radial piston-cylinder units
- F04B1/0476—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with two or more serially arranged radial piston-cylinder units located side-by-side
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention discloses a multi-row multi-action inner curve rotor driven digital variable radial plunger pump, which is characterized in that a plunger roller assembly is driven to perform reciprocating motion based on a rotating inner curve rotor and an inner curve guide rail arranged on a return pressure plate, a closed plunger cavity is formed by a plunger and a plunger hole in a shell, the volume of the closed plunger cavity is periodically increased and reduced along with the reciprocating motion of the plunger, an oil suction one-way valve, an oil discharge one-way valve and a high-speed digital switch valve are respectively embedded and installed in a channel communicated with each plunger cavity in the shell, so that the oil suction and discharge functions of the pump are realized, and the variable displacement control and regulation of the pump from the maximum displacement to the zero displacement working condition by an approximate linear change rule is realized by actively controlling the opening and closing state and the opening and closing sequence of a valve port of the high-. The invention is suitable for low-speed working conditions, and the design of the multi-action inner curve guide rail and the multi-row inner curve rotors is easy to achieve large displacement, thereby solving the problem that the current hydraulic pump is difficult to realize the working condition of low-speed large-displacement and variable-displacement regulation.
Description
Technical Field
The invention relates to the technical field of hydraulic elements, in particular to a multi-row multi-action inner curve rotor driving digital variable radial plunger pump.
Background
With the use of a large amount of fossil fuels, the reduction of the fossil fuels starts to restrict the development of the human economic society, and the emission generated after the combustion of the fossil fuels damages the environment day by day, so that the human is promoted to search renewable environment-friendly energy sources. Wind energy is a safe, clean and renewable green energy, and belongs to the most mature and large-scale development prospect of renewable energy. The traditional wind generating set generally adopts an alternating current excitation doubly-fed generator (DFIG) taking a speed-increasing gear box as main drive and a multi-stage Permanent Magnet Synchronous Generator (PMSG) directly driven by a gearless box. The environment and the working condition of wind power generation are generally severe, so the maintenance cost of the DFIG with the gear box is the highest, and the high-occurrence period of the fault of the gear box occurs between 5 and 8 years after the DFIG is put into operation, which has a significant difference from the design life of a wind turbine of 15 to 20 years; for the PMSG without a gearbox structure, the PMSG has the defects of excessive pole pair number, large volume, heavy total amount, high cost and the like of a permanent magnet direct drive motor. In order to overcome the problems, wind generating sets applying hydraulic technology are produced.
In order to achieve the aim that non-fossil energy accounts for 15% of the total energy demand in 2020, the development and equipment of a novel wind generating set gradually become the main direction and the highest point of the development of the wind power industry and are also the new growth point of the wind power industry. In order to realize the aim, the research and development of the high-pressure low-speed large-displacement hydraulic pump applied to the wind power field have important significance: the hydraulic pump adopted in the hydraulic wind turbine generator set is a core element of the wind turbine generator set, and in order to adapt to the harsh environment of a wind farm and the requirement of high power of wind power generation, the hydraulic pump must be a high-pressure pump and has the characteristics of low rotating speed and large discharge capacity.
The technical characteristics of the conventional hydraulic pump are that ① realizes the large displacement of the pump, one of main ways is realized by improving the rotating speed of the pump, but along with the increase of the rotating speed, the abrasion and inertia force of components in the hydraulic pump can be increased, so the service life of the pump is influenced, ② a prime mover for providing direct power for the hydraulic pump is generally a motor or an engine, the working rotating speed of the prime mover for realizing high-efficiency operation can exceed 1000r/min, and when the pump operates at low speed, a gearbox is required to be connected in the middle, so when the hydraulic pump operates at the low-speed working condition, on one hand, an ideal matching power source is difficult to find, on the other hand, the prime mover contradicts with the large displacement trend of the pump, namely, the advantage of large power displacement ratio of the hydraulic pump cannot be embodied, the technical development prospect of the hydraulic pump with the large power generation and the development prospect of ocean power generation is expected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a multi-row multi-action inner curve rotor driving digital variable radial plunger pump, when a rotor rotates for one circle, a single plunger can finish multiple times of oil suction and discharge, the purpose is to realize low-speed large-discharge control of a hydraulic pump and variable-discharge control of a radial plunger pump, and the problem that a conventional hydraulic pump is difficult to realize large-discharge control under a low-speed working condition is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: the transmission shaft is rotatably arranged in the middle of the shell and is controlled to rotate by a prime mover, and an annular cavity is formed between the shell and the transmission shaft; the inner curve rotor fixedly sleeved on the transmission shaft is arranged in the annular cavity, a plurality of plunger holes radially arranged at intervals are formed in the shell, an annular groove corresponding to the positions of the plunger holes is formed in the annular outer wall of the inner curve rotor, the bottom of the annular groove is communicated with an annular guide rail cavity, the bottom surface of the guide rail cavity is an equal-acceleration equal-deceleration inner curve guide rail, and the top surface of the guide rail cavity is an equal-acceleration equal-deceleration inner curve return guide rail.
And when the inner curve rotor rotates along with the transmission shaft, each roller wheel performs reciprocating periodic rolling along an equal-acceleration equal-deceleration inner curve return guide rail in the guide rail cavity, and meanwhile, the head of the plunger piston respectively performs reciprocating up-and-down motion in the corresponding plunger piston hole.
An annular oil suction cavity is arranged on one side of the plunger hole in the shell, an annular oil discharge cavity is arranged on the other side of the plunger hole, and an oil suction port communicated with the oil suction cavity and an oil discharge port communicated with the oil discharge cavity are formed in the shell; an oil suction passage is respectively communicated between the oil suction cavity and each plunger hole, and an oil discharge passage is respectively communicated between the oil discharge cavity and each plunger hole; an oil suction one-way valve is installed in each oil suction channel, and an oil discharge one-way valve is installed in each oil discharge channel; cross-shaped channels are formed among the corresponding oil absorption channels, the corresponding oil discharge channels and the corresponding plunger holes, and the top part of each cross-shaped channel is provided with a high-speed digital switch valve; the middle part of each cross-shaped channel is enclosed into a closed plunger cavity by the corresponding oil absorption one-way valve, oil discharge one-way valve, plunger and high-speed digital switch valve; one end of the valve port of each high-speed digital switch valve is communicated with the corresponding plunger cavity, and the other end of the valve port of each high-speed digital switch valve is communicated with the corresponding oil suction cavity.
The multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: the shell comprises a front shell and a rear shell which are respectively and rotatably arranged on the transmission shaft, and the front shell and the rear shell are fixedly connected into a whole in an involutory mode; the outer side of the front shell is fixedly connected with a front end cover sleeved on the transmission shaft, and the outer side of the rear shell is fixedly connected with a rear end cover sleeved on the transmission shaft; and a shaft seal is arranged between the front end cover and the transmission shaft.
The multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: the inner curve rotor is rotatably arranged on the transmission shaft through a spline, an open annular step I is arranged at the outer side edge of the annular outer wall of the inner curve rotor, an annular return pressure plate sleeved on the transmission shaft is fixed on the outer side surface of the inner curve rotor, an annular step II is arranged at the position, corresponding to the annular step groove, on the return pressure plate, and an annular groove is formed between the annular step II and the annular step I of the inner curve rotor in an involutive mode; two sides of the bottom of the annular groove are respectively provided with an annular guide rail cavity with three annular steps, the equal-acceleration equal-deceleration inner curve guide rail is positioned on the inner curve rotor, and the equal-acceleration equal-deceleration inner curve return guide rail is positioned on the return pressure plate.
The multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: an oil absorption distribution fluid is fixed on the outer side of the outer shell, an annular groove containing cavity is arranged on the oil absorption distribution fluid, and an oil absorption cavity is formed between the annular groove containing cavity and the outer shell.
The multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: o-shaped rings are arranged between the front end cover and the front shell, between the rear end cover and the rear shell, between the oil suction flow ligand and the front shell and on the upper side and the lower side of the oil suction cavity, and between the front shell and the rear shell and on the upper side and the lower side of the oil discharge cavity.
The multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: the section of the inner curve guide rail is an equal acceleration equal deceleration inner curve, a cosine acceleration motion law inner curve, a sine acceleration motion law inner curve, a trapezoid acceleration motion law inner curve or a parabola acceleration motion law inner curve.
The shaft seal is installed between the transmission shaft and the front end cover, the transmission shaft is driven by a prime motor through a spline and is connected with the inner curve rotor through the spline, the front end cover is fixedly installed on the front shell through a screw, and an O-shaped ring is installed between the front end cover and the front shell. The procapsid is supported by the fore bearing and is installed on the transmission shaft to through screw and hou mian fixed connection, the fore bearing inner circle is installed on the transmission shaft, and is spacing by the shoulder, the front end housing and the gasket and the jump ring axial of epaxial shaft shoulder, procapsid, the back casing passes through the screw and links together with the procapsid to support on the transmission shaft by the rear bearing, the rear bearing inner circle is installed on the transmission shaft, and is spacing by the epaxial gasket of shoulder, rear end housing and transmission of back casing and jump ring axial, the rear end housing passes through screw fixed connection on the casing of back, installs O type circle simultaneously between rear end housing and back casing.
The inner curve rotor is connected and installed on the transmission shaft through a spline, the inner curve rotor is provided with an equal-acceleration equal-deceleration inner curve guide rail, the roller is installed on a round hole at the bottom of the plunger through a shaft hole in a clearance fit manner, the roller is fixedly installed on the roller, the roller and the roller are supported by the equal-acceleration equal-deceleration inner curve guide rail on the inner curve rotor and roll on the inner curve guide rail in a reciprocating periodic manner, the bottom end of the plunger is supported by the roller and the roller, the head part of the plunger is installed in a plunger hole formed in the front shell through the shaft hole in a clearance fit manner, the head part of the plunger continuously performs reciprocating motion in the plunger hole along with the rotation of the transmission shaft, the return pressure plate is supported by the transmission shaft and is fixedly connected with the inner curve rotor through a screw and is limited by a shaft sleeve and a snap spring in the axial direction, the, the oil discharge one-way valve is embedded in an oil discharge channel communicated with the plunger cavity, and the high-speed digital switch valve is installed in an outer channel communicated with the plunger cavity.
The oil suction one-way valve is positively opened when the volume of the plunger cavity is increased, low-pressure oil flows into the plunger cavity from the oil suction cavity, the oil suction cavity is formed by an annular groove containing cavity in oil suction distribution fluid and an oil suction pore channel at the tail part of the oil suction one-way valve in the front shell, the oil suction distribution fluid is fixedly connected with the front shell through screws, O-shaped rings are arranged on two sides of the annular groove oil suction containing cavity formed in the oil suction distribution fluid, the oil discharge one-way valve is positively opened when the volume of the plunger cavity is reduced and hydraulic oil is increased to opening pressure by extrusion pressure, high-pressure oil is discharged into the oil discharge cavity from the plunger cavity through the oil discharge one-way valve, the oil discharge cavity is formed by an annular oil discharge containing cavity formed in the rear shell and an oil discharge pore channel at the tail part of the oil discharge one-way valve, the O-shaped rings are arranged on two sides of the annular groove oil discharge containing cavity, the oil suction cavity and the oil discharge, the front shell is internally provided with a pore passage for communicating the valve port of the high-speed digital switch valve with the oil suction cavity, the outer edge of the pore passage is provided with an O-shaped ring, one end of the valve port of the high-speed digital switch valve is communicated with the plunger cavity, the other end of the valve port is communicated with the oil suction cavity, the on-off of the oil suction cavity and the plunger cavity is realized by actively controlling the opening and closing of the valve port of the high-speed digital switch valve, and the variable displacement control and regulation of the pump can.
The number of the oil suction one-way valves, the oil discharge one-way valves and the high-speed digital switch valves is multiple and corresponds to the number of the plungers, the plungers are uniformly distributed in the front shell in a radial shape, are supported and driven by the inner curve guide rail on the inner curve rotor, and simultaneously, under the action of an inner curve return guide rail on a return pressure plate, the same plunger can finish multiple times of oil suction and discharge reciprocating motion after each rotation of the inner curve rotor, the same structural principle can be applied to a plurality of inner curve rotors, if the plurality of inner curve rotors are sequentially arranged on the same transmission shaft through spline connection, the plunger, the oil suction one-way valve, the oil discharge one-way valve, the high-speed digital switch valve and the like can be copied and transplanted on other inner curve rotors according to the similar structure principle to form a multi-row multi-action inner curve rotor driving digital variable radial plunger pump.
Compared with the prior art, the invention has the advantages that:
the dynamic characteristic of the multi-row multi-action inner curve rotor driving digital variable radial plunger pump is particularly suitable for low-speed large-displacement working conditions, and the multi-row multi-action inner curve rotor driving digital variable radial plunger pump has a very good application prospect when being used as a low-speed large-displacement control plunger pump in a pump motor transmission device in such random low-rotation-speed driving working conditions as a hydraulic wind generating set, a wind power driving device and the like, and solves the problem that the conventional hydraulic pump is difficult to realize low-speed large-displacement and variable-displacement regulation working conditions.
Drawings
FIG. 1 is an axial cross-sectional view of the present invention.
Fig. 2 is an overall outline view and a schematic view of an oil suction port of the present invention.
FIG. 3 is an overall view of the present invention and a schematic view of the oil drain port.
Fig. 4 is a sectional view of the inner curve guide rail with equal acceleration and equal deceleration.
Reference numerals in fig. 1-4 are: the oil-gas mixing device comprises a shaft seal 1, a transmission shaft 2, an O-shaped ring 3, a front end cover 4, a front bearing 5, a front shell 6, an O-shaped ring 7, an oil suction cavity 8, an oil suction one-way valve 9, an O-shaped ring 10, an oil suction fluid distribution body 11, a high-speed digital switch valve 12, an O-shaped ring 13, an oil discharge one-way valve 14, an O-shaped ring 15, an oil discharge cavity 16, a rear shell 17, a screw 18, a return pressure plate 19, a rear end cover 20, an O-shaped ring 21, a clamp spring 22, a gasket 23, a clamp spring 24, a screw 25, a rear bearing 26, a shaft sleeve 27, an oil discharge port 28, a plunger 29, a roller 30, a roller 31, an inner curve rotor 32, a gasket 33, a clamp spring 34, an oil suction.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in fig. 1, 2, 3 and 4, the multi-row multi-acting inner curve rotor driving digital variable radial plunger pump comprises a shaft seal 1, a transmission shaft 2, an O-ring 3, a front end cover 4, a front bearing 5, a front shell 6, an O-ring 7, an oil suction cavity 8, an oil suction check valve 9, an O-ring 10, an oil suction distribution fluid 11, a high-speed digital switch valve 12, an O-ring 13, an oil discharge check valve 14, an O-ring 15, an oil discharge cavity 16, a rear shell 17, a screw 18, a return pressure plate 19, a rear end cover 20, an O-ring 21, a snap spring 22, a gasket 23, a snap spring 24, a screw 25, a rear bearing 26, a shaft sleeve 27, an oil discharge port 28, a plunger 29, a roller 30, a roller 31, an inner curve rotor 32, a gasket 33, a snap spring 34, an oil suction port 35, an acceleration-like deceleration inner curve guide.
The shaft seal 1 is installed between the transmission shaft 2 and the front end cover 4, the transmission shaft 2 is driven by a prime mover through a spline and is connected with the inner curve rotor 32 through the spline, the front end cover 4 is fixedly installed on the front housing 6 through a screw, and the O-shaped ring 3 is installed between the front end cover 4 and the front housing 6. The front shell 6 is supported and mounted on the transmission shaft 2 by a front bearing 5 and is fixedly connected with the rear shell 17 through a screw 18, the inner ring of the front bearing 5 is mounted on the transmission shaft 2 and is axially limited by a shoulder on the transmission shaft 2, a shoulder on the front shell 6, the front end cover 4, a gasket 33 and a clamp spring 34, the rear shell 17 is connected with the front shell 6 through the screw 18 and is supported on the transmission shaft 2 by a rear bearing 26, the inner ring of the rear bearing 26 is mounted on the transmission shaft 2 and is axially limited by the shoulder on the rear shell 17, the rear end cover 20, the gasket 23 on the transmission shaft 2 and the clamp spring 22, the rear end cover 20 is fixedly connected on the rear shell 17 through a screw 25, and an O-shaped ring 21 is mounted between.
An inner curve rotor 32 is connected and installed on a transmission shaft 2 through a spline, an inner curve guide rail 36 with equal acceleration and equal deceleration is arranged on the inner curve rotor 32, a roller 30 is installed on a round hole at the bottom of a plunger 29 through a shaft hole in a clearance fit manner, a roller 31 is fixedly installed on the roller 30, the roller 30 and the roller 31 are supported by the inner curve rotor 32 through the inner curve guide rail 36 with equal acceleration and equal deceleration and roll on the inner curve guide rail 36 in a reciprocating periodic manner, the bottom end of the plunger 29 is supported by the roller 30 and the roller 31, the head of the plunger 29 is installed in a plunger hole formed in a front shell body 6 through the shaft hole in a clearance fit manner, the head of the plunger 29 continuously performs reciprocating movement in the plunger hole along with the rotation of the transmission shaft 2, a return pressure plate 19 is supported by the transmission shaft 2 and is fixedly connected with the inner curve rotor 32 through a screw, the axial direction is limited by a shaft sleeve 27 and a clamp spring 24, the oil discharge one-way valve 14 is embedded and installed in an oil discharge channel communicated with the plunger cavity 38, and the high-speed digital switch valve 12 is installed in an outer pore channel communicated with the plunger cavity 38.
The oil suction one-way valve 9 is opened in the positive direction when the volume of the plunger cavity 38 is increased, low-pressure oil flows into the plunger cavity 38 from the oil suction cavity 8, the oil suction cavity 8 is composed of an annular groove containing cavity in the oil suction distribution fluid 11 and an oil suction pore channel at the tail part of the oil suction one-way valve 9 in the front shell 6, the oil suction distribution fluid 11 is fixedly connected with the front shell 6 through screws, the O-shaped rings 7 and the O-shaped rings 10 are installed at two sides of the annular groove oil suction cavity formed in the oil suction distribution fluid 11, the oil discharge one-way valve 14 is opened in the positive direction when the volume of the plunger cavity 38 is reduced and hydraulic oil is increased to opening pressure by extrusion pressure, high-pressure oil is discharged into the oil discharge cavity 16 from the plunger cavity 38 through the oil discharge one-way valve 14, the oil discharge cavity 16 is composed of an annular oil discharge cavity formed in the rear shell 17 and an oil discharge pore channel at the tail part of the oil discharge one-way valve 14, the O-shaped rings, the high-speed digital switch valve 12 is arranged in a pore channel communicated with the plunger cavity 38 on the front shell 6, a pore channel communicating a valve port of the high-speed digital switch valve 12 with the oil suction cavity 8 is arranged in the front shell 6, an O-shaped ring is arranged on the outer edge of the pore channel, one end of the valve port of the high-speed digital switch valve 12 is communicated with the plunger cavity 38, the other end of the valve port is communicated with the oil suction cavity 8, the on-off of the oil suction cavity 8 and the plunger cavity 38 is realized by actively controlling the on-off of the valve port of the high-speed digital switch valve 12, and the variable displacement control and.
The number of the oil suction one-way valves 9, the oil discharge one-way valves 14 and the high-speed digital switch valves 12 is a plurality, the number of the oil suction one-way valves 9, the oil discharge one-way valves 14 and the high-speed digital switch valves 12 corresponds to the number of the plungers 29, the plungers 29 are radially and uniformly distributed in the front shell 6, only one inner curve rotor 32 is shown in figure 1, the plungers 29 are supported and driven by an inner curve guide rail 36 on the inner curve rotor 32, and simultaneously, under the action of an inner curve return guide rail 37 on the return pressure plate 19, the same plunger 29 can complete a plurality of times of oil suction and discharge reciprocating motions every time the inner curve rotor 32 rotates for one rotation, the same plunger 29 can be adapted to the plurality of inner curve rotors 32, if the plurality of inner curve rotors 32 are sequentially installed on the same transmission shaft 2 through spline connection, the plungers 29, the oil suction one-way valves 9, the oil discharge one-way valves 14, the, form a multi-row multi-action inner curve rotor driving digital variable radial plunger pump.
The working process of the invention is as follows:
driven by wind power or other prime movers, the transmission shaft 2 rotates under the supporting action of the front bearing 5 and the rear bearing 26, the inner curve rotor 32 is connected with the transmission shaft 2 through a spline, therefore, the inner curve rotor 32 rotates along with the transmission shaft 2, the side surface of the outer edge of the inner curve rotor 32 is provided with an inner curve guide rail 36 with equal acceleration and equal deceleration, the roller 30 and the roller 31 which are installed together with the plunger are driven to roll on the inner curve guide rail 36 with equal acceleration and equal deceleration due to the rotating action of the inner curve guide rail 36 with equal acceleration and equal deceleration, so that the plunger 29 executes periodic reciprocating motion in the plunger hole of the front shell 6, the plunger 29 executes a forward stroke under the driving of the inner curve guide rail 36 with equal acceleration and equal deceleration, the volume of the plunger cavity 38 is reduced, and under the forced return stroke action of the inner curve return guide rail with equal acceleration and equal deceleration, which is arranged at the inner curve return pressure plate 19, the plunger 29 which has completed the forward stroke then executes a return stroke, in which case the volume of the plunger chamber 38 increases.
When the volume of the plunger cavity 38 is increased, a local negative pressure is formed inside the plunger cavity 38, at this time, the valve port of the oil suction check valve 9 is opened under the action of a pressure difference between the external atmospheric pressure and the negative pressure inside the plunger cavity 38, low-pressure oil is sucked into the plunger cavity 38 through the oil suction check valve 9 through the oil suction port 35 and the oil suction cavity 8 of the pump, when the volume of the plunger cavity 38 is reduced, hydraulic oil inside the plunger cavity 38 is pressurized and increased in pressure by the squeezing action, so that the valve port of the oil suction check valve 9 is closed, when the pressure of the hydraulic oil inside the plunger cavity 38 is increased to be more than or equal to the sum of the load pressure of the pump outlet and the valve port opening pressure of the oil discharge check valve 14, the valve port of the oil discharge check valve 14 is opened, and high-pressure oil is then pressure-discharged from the plunger cavity 38. When the inner curve rotor 32 rotates once, the plunger 29 can complete a plurality of reciprocating motions to realize a plurality of oil suction and discharge, and the plurality of plungers 29 radially and radially arranged in the front shell 6 continuously perform reciprocating motions to suck and discharge oil under the continuous driving rotation action of the transmission shaft 2 along with the inner curve rotor 32, so that the functions of sucking low-pressure oil and discharging high-pressure oil of the pump are realized.
When the high-speed digital switch valve 12 is powered off and does not work, the oil suction and discharge functions of the pump are completed by the oil suction check valve 9 and the oil discharge check valve 14, at this time, the pump is used as a constant displacement pump and works in the maximum displacement working condition, when the pump needs to be adjusted in a variable displacement manner, before the volume reduction of the plunger cavity 38 begins, the high-speed digital switch valve 12 corresponding to the plunger cavity 38 is powered on, the valve port of the high-speed digital switch valve 12 is driven to be opened, in the forward stroke of the plunger cavity 38 with the volume reduced plunger 29, hydraulic oil in the plunger cavity 38 is returned to the oil suction cavity 8 of the pump through the opened valve port of the high-speed digital switch valve 12, the external expression shows that the function of the plunger cavity 38 for discharging high-pressure oil is failed, the high-pressure oil flow output by the oil discharge port 28 of the pump is reduced, namely, the displacement of the pump is adjusted to a smaller level, and the power-off state and the power-on sequence, the displacement of the pump can be adjusted in a manner of approximately linear and smooth change from the maximum displacement to the zero displacement.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but encompasses equivalent technical means as would be appreciated by those skilled in the art based on the inventive concept.
Claims (6)
1. A multi-row multi-action inner curve rotor driving digital variable radial plunger pump is characterized in that: the transmission shaft is rotatably arranged in the middle of the shell and is controlled to rotate by a prime mover, and an annular cavity is formed between the shell and the transmission shaft; the inner curve rotor fixedly sleeved on the transmission shaft through spline connection is arranged in the annular cavity, a plurality of plunger holes radially arranged at intervals are arranged in the shell, an annular groove corresponding to the plunger holes is formed in the annular outer wall of the inner curve rotor, the bottom of the annular groove is communicated with an annular guide rail cavity, the bottom surface of the guide rail cavity is an equal-acceleration equal-deceleration inner curve guide rail, and the top surface of the guide rail cavity is an equal-acceleration equal-deceleration inner curve return guide rail;
a plunger is arranged in each plunger hole, the bottom of the plunger penetrates through the annular groove and then is inserted into the guide rail cavity, a transverse hole is formed in the insertion end of the plunger, a roller is rotatably arranged in the transverse hole, rollers are fixedly sleeved at two ends of the roller respectively, when the inner curve rotor rotates along with the transmission shaft, each roller performs reciprocating periodic rolling in the guide rail cavity along the equal-acceleration equal-deceleration inner curve guide rail, and meanwhile, the head of the plunger respectively performs reciprocating up-and-down motion in the corresponding plunger hole;
an annular oil suction cavity is arranged on one side of the plunger hole in the shell, an annular oil discharge cavity is arranged on the other side of the plunger hole, and an oil suction port communicated with the oil suction cavity and an oil discharge port communicated with the oil discharge cavity are formed in the shell; an oil suction passage is respectively communicated between the oil suction cavity and each plunger hole, and an oil discharge passage is respectively communicated between the oil discharge cavity and each plunger hole; an oil suction one-way valve is installed in each oil suction channel, and an oil discharge one-way valve is installed in each oil discharge channel; cross-shaped channels are formed among the corresponding oil absorption channels, the corresponding oil discharge channels and the corresponding plunger holes, and the top part of each cross-shaped channel is provided with a high-speed digital switch valve; the middle part of each cross-shaped channel is enclosed into a closed plunger cavity by the corresponding oil absorption one-way valve, oil discharge one-way valve, plunger and high-speed digital switch valve; one end of the valve port of each high-speed digital switch valve is communicated with the corresponding plunger cavity, and the other end of the valve port of each high-speed digital switch valve is communicated with the corresponding oil suction cavity.
2. The multi-row, multi-acting, inner curve rotor driven digital variable radial piston pump of claim 1, wherein: the shell comprises a front shell and a rear shell which are respectively rotatably arranged on the transmission shaft, and the front shell and the rear shell are fixedly connected into a whole in an involutory mode; the outer side of the front shell is fixedly connected with a front end cover sleeved on the transmission shaft, and the outer side of the rear shell is fixedly connected with a rear end cover sleeved on the transmission shaft; and a shaft seal is arranged between the front end cover and the transmission shaft.
3. The multi-row, multi-acting, inner curve rotor driven digital variable radial piston pump of claim 2, wherein: the inner curve rotor is rotatably arranged on the transmission shaft through a spline, an open annular step I is arranged at the outer side edge of the annular outer wall of the inner curve rotor, an annular return pressure plate sleeved on the transmission shaft is fixed on the outer side surface of the inner curve rotor, an annular step II is arranged at the position, corresponding to the annular step I, on the return pressure plate, and an annular groove is formed between the annular step II and the annular step I of the inner curve rotor in an involutive mode; two sides of the bottom of the annular groove are respectively provided with an annular guide rail cavity with three annular steps, the equal-acceleration equal-deceleration inner curve guide rail is positioned on the inner curve rotor, and the equal-acceleration equal-deceleration inner curve return guide rail is positioned on the return pressure plate.
4. The multi-row, multi-acting, inner curve rotor driven digital variable radial piston pump of claim 2, wherein: an oil absorption distribution fluid is fixed on the outer side of the front shell, an annular groove containing cavity is arranged on the oil absorption distribution fluid, and an oil absorption cavity is formed between the annular groove containing cavity and the front shell.
5. The multi-row, multi-acting, inner curve rotor driven digital variable radial piston pump of claim 4, wherein: o-shaped rings are arranged between the front end cover and the front shell, between the rear end cover and the rear shell, between the oil suction flow ligand and the front shell and on the upper side and the lower side of the oil suction cavity, and between the front shell and the rear shell and on the upper side and the lower side of the oil discharge cavity.
6. The multi-row, multi-acting, inner curve rotor driven digital variable radial piston pump of claim 1, wherein: the inner curve section of the inner curve return guide rail is an equal acceleration equal deceleration inner curve, a cosine acceleration motion law inner curve, a sine acceleration motion law inner curve, a trapezoid acceleration motion law inner curve or a parabola acceleration motion law inner curve.
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| CN201811106463.0A CN109236595B (en) | 2018-09-21 | 2018-09-21 | Multi-row multi-action inner curve rotor driving digital variable radial plunger pump |
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| CN201811106463.0A CN109236595B (en) | 2018-09-21 | 2018-09-21 | Multi-row multi-action inner curve rotor driving digital variable radial plunger pump |
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| CN109236595B true CN109236595B (en) | 2020-02-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110848126B (en) * | 2019-11-28 | 2020-12-25 | 兰州理工大学 | Plunger type digital pump |
| CN113339222B (en) * | 2021-07-20 | 2024-07-23 | 安徽理工大学 | Double-row axial plunger pump based on digital variable |
| CN114198277B (en) * | 2021-12-14 | 2023-03-31 | 浙江工业大学 | Gear drive reciprocating piston pump |
| CN114962200B (en) * | 2022-05-11 | 2023-05-23 | 哈尔滨工业大学（深圳） | Multiple frequency cam digital pump |
| CN115899022B (en) * | 2023-02-27 | 2023-09-26 | 太原科技大学 | Internally curved motor stator guide rail-plunger assembly impact load testing device |
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