CN109236595B - A Multi-row Multi-acting Internal Curve Rotor Driven Digital Variable Radial Piston Pump - Google Patents

Abstract

The invention discloses a digital variable radial piston pump driven by a multi-row and multi-acting inner curvilinear rotor. Based on a rotating inner curvilinear rotor and an inner curvilinear guide rail provided on a return pressure plate, a plunger roller assembly is driven to perform reciprocating motion. The closed plunger cavity formed by the plunger hole in the casing, the volume of which increases and decreases periodically with the reciprocating movement of the plunger, and is embedded in the channel communicating with each plunger cavity in the casing. Oil suction check valve, oil discharge check valve and high-speed digital switch valve are installed to realize the pump's oil suction and discharge function, and by actively controlling the opening and closing state and opening and closing sequence of the high-speed digital switch valve, the pump can be discharged from the maximum discharge. The variable displacement control and adjustment are smoothly carried out with an approximate linear change law from the displacement to zero displacement. The invention is suitable for low-speed working conditions, and through the design of multi-action inner curve guide rails and multi-row inner curve rotors, it is easy to achieve large displacement, and solves the problem that the current hydraulic pump is difficult to achieve low-speed large displacement and variable displacement adjustment conditions.

Description

A Multi-row Multi-acting Internal Curve Rotor Driven Digital Variable Radial Piston Pump

technical field

The invention relates to the technical field of hydraulic components, in particular to a multi-row multi-acting internal curve rotor-driven digital variable radial piston pump.

Background technique

With the large-scale use of fossil fuels, the reduction of fossil fuels has begun to restrict the development of human economy and society. The emissions of fossil fuels are increasingly damaging to the environment, prompting humans to look for renewable and environmentally friendly energy sources. Wind energy is a kind of safe, clean and renewable green energy, which belongs to the most mature technology and the most promising energy for large-scale development among the renewable energy sources. Traditional wind turbines generally use AC excitation double-fed generators (DFIG) driven by speed-increasing gearboxes and multi-stage permanent magnet synchronous generators (PMSG) directly driven without gearboxes. The environment and working conditions of wind power generation are generally harsh, so the maintenance cost of DFIG with gearbox is the highest, and the high incidence period of gearbox failure occurs in 5 to 8 years after it is put into operation, which is similar to the design life of wind turbine 15 to 20 years There are obvious gaps; for PMSG without gearbox structure, it has the disadvantages of too many pole pairs, huge volume, too heavy total, and high cost of permanent magnet direct drive motor. In order to overcome the above problems, wind turbines using hydraulic technology came into being.

In order to achieve the goal of non-fossil energy accounting for 15% of the total energy demand in 2020, the development and equipment of new wind turbines will gradually become the main direction and commanding height of the development of the wind power industry, as well as a new growth point of the wind power industry. In order to achieve this goal, it is of great significance to develop a high-pressure, low-speed, large-displacement hydraulic pump for wind power: the hydraulic pump used in the hydraulic wind turbine is the core component of the wind turbine. To meet the requirements of high power generation, the hydraulic pump must be a high-pressure pump with the characteristics of low speed and large displacement.

It is unrealistic to realize the large displacement of the pump under low speed conditions by using the conventional hydraulic pump form, which often makes the volume of the pump very large. High pressure, low speed, large displacement, and variable displacement control function. At present, hydraulic pumps with this technical feature are rarely reported. The main reasons are: ① To achieve large displacement of the pump, one of the main ways is to increase the speed of the pump to accomplish. However, as the speed increases, the wear and inertia force of the components in the hydraulic pump will increase, thus affecting the service life of the pump; ② The prime mover that provides direct power to the hydraulic pump is generally a motor or an engine, and these prime movers achieve high efficiency The working speed of operation often exceeds 1000r/min. When the pump is running at low speed, the gearbox needs to be connected in the middle. Therefore, when the hydraulic pump works at low speed, on the one hand, it is difficult to find an ideal matching power source. Based on the traditional market demand and the immature technology of low-speed and large-displacement hydraulic pumps, the development of low-speed and large-displacement hydraulic pumps has been restricted. With the rise and vigorous development of emerging strategic industries such as wind power generation and ocean energy power generation, it is foreseeable that the application prospects of low-speed and large-displacement hydraulic pumps will be very broad.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a digital variable radial piston pump driven by a multi-row multi-acting inner curve rotor. When the rotor rotates once, a single plunger can complete multiple times of oil suction and discharge. It is to realize the low-speed and large-displacement quantification of hydraulic pumps and the variable displacement control of radial piston pumps, and to solve the problem that conventional hydraulic pumps are difficult to achieve large-displacement quantification under low-speed conditions.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A multi-row multi-acting internal curve rotor drive digital variable radial piston pump is characterized in that: it comprises a casing, a transmission shaft controlled by the prime mover is installed in the middle of the casing, and the casing and the transmission shaft are rotatably installed. An annular cavity is formed; the annular cavity is provided with an inner curved rotor that is fixedly sleeved on the transmission shaft, the casing is provided with a plurality of plunger holes arranged radially at intervals, and the annular outer wall of the inner curved rotor is provided with There is an annular groove corresponding to the position of the plunger hole, and the bottom of the annular groove is connected with an annular guide rail cavity.

A plunger is installed in each plunger hole, the bottom of the plunger is inserted into the guide rail cavity after passing through the annular groove, and the insertion end of the plunger is provided with a transverse hole, and a roller is rotatably installed in the transverse hole. The ends are respectively fixed with rollers. When the inner curve rotor rotates with the transmission shaft, each roller rolls periodically along the inner curve return rail with constant acceleration and constant deceleration in the guide rail cavity. Reciprocating up and down movement in the plunger hole.

The casing is provided with an annular oil suction cavity on one side of the plunger hole, and an annular oil discharge cavity on the other side of the plunger hole. An oil discharge port connected with the cavity; an oil suction channel is respectively connected with the oil suction cavity and each plunger hole, and an oil discharge channel is respectively connected with the oil discharge cavity and each plunger hole; each oil suction channel is installed in There is an oil suction check valve, and each oil discharge channel is equipped with an oil discharge check valve; a cross-shaped channel is formed between the corresponding oil suction channel, oil discharge channel and the plunger hole, and the top part of each cross-shaped channel is installed There are high-speed digital switch valves; the middle part of each cross-shaped channel is enclosed by the corresponding oil suction check valve, oil discharge check valve, plunger and high-speed digital switch valve to form a closed plunger cavity; each high-speed digital switch valve One end of the valve port is communicated with the corresponding plunger cavity, and the other end is communicated with the corresponding oil suction cavity.

The multi-row multi-acting internal curve rotor-driven digital variable radial piston pump is characterized in that: the casing includes a front and a rear casing that are respectively rotatably mounted on the transmission shaft, and the front and rear casings are The butt joint is fixed and connected as a whole; the outer side of the front casing is fixedly connected with a front end cover sleeved on the transmission shaft, and the outer side of the rear casing is fixedly connected with a rear end cover sleeved on the transmission shaft; a shaft is installed between the front end cover and the transmission shaft seal up.

The multi-row and multi-acting inner-curve rotor drive digital variable radial piston pump is characterized in that: the inner-curve rotor is installed on the transmission shaft by spline rotation; The first annular step of the mouth, the outer side of the inner curve rotor is fixed with an annular return pressure plate sleeved on the transmission shaft, the part of the return pressure plate corresponding to the annular step groove is provided with an annular step 2, the annular step 2 and the inner curve rotor The annular step 1 The two sides of the bottom of the annular groove are respectively provided with annular steps to form an annular guide rail cavity. The constant acceleration and constant deceleration inner curve guide rail is located on the inner curve rotor, and the constant acceleration and constant deceleration inner curve return guide rail is located on the return path. platen.

The multi-row multi-acting inner curve rotor drive digital variable radial piston pump is characterized in that: an oil absorption and distribution fluid is fixed on the outer side of the outer casing, and an annular groove cavity is provided on the oil absorption and distribution fluid. An oil suction chamber is formed between it and the outer casing.

The multi-row multi-acting internal curve rotor drive digital variable radial piston pump is characterized in that: between the front end cover and the front casing, between the rear end cover and the rear casing, and between the oil suction flow part and the front casing. O-rings are installed between the casings on the upper and lower sides of the oil suction chamber, and between the front casing and the rear casing on the upper and lower sides of the oil discharge chamber.

The multi-row and multi-acting inner curve rotor drive digital variable radial piston pump is characterized in that: the inner curve section of the inner curve guide rail is a constant acceleration and constant deceleration inner curve, a cosine acceleration motion law inner curve, and a sine acceleration motion. The inner curve of the law, the inner curve of the trapezoidal acceleration movement law or the inner curve of the parabolic acceleration movement law.

The shaft seal is installed between the transmission shaft and the front end cover, the transmission shaft is driven by the prime mover through splines, and at the same time is connected with the inner curve rotor through the splines, and the front end cover is fixedly installed on the front housing by screws, At the same time, an O-ring is installed between the front end cover and the front housing. The front housing is supported and mounted on the transmission shaft by the front bearing, and is fixedly connected with the rear housing by screws. Shoulder, front end cover, gasket and circlip are axially limited, the rear casing is connected with the front casing by screws, and is supported on the transmission shaft by a rear bearing, and the inner ring of the rear bearing is installed on the transmission shaft On the upper side, the axial position is limited by the shoulder of the rear casing, the rear end cover, the gasket and the circlip on the transmission shaft, and the rear end cover is fixedly connected to the rear casing by screws, and is connected to An O-ring is installed between the housings.

The inner curve rotor is installed on the transmission shaft through spline connection, the inner curve guide rail is provided with constant acceleration and constant deceleration, and the roller is installed on the circular hole at the bottom of the plunger through the clearance fit of the shaft hole. The roller is fixedly installed on the roller, the roller and the roller are supported by the inner curve guide rail with constant acceleration and constant deceleration on the inner curve rotor, and roll back and forth periodically on the inner curve guide rail, and the bottom end of the plunger is connected by the roller and the roller. Roller support, the plunger head is installed in the plunger hole opened in the front housing through the shaft hole clearance fit, with the rotation of the transmission shaft, the plunger head continuously performs reciprocating motion in the plunger hole, the return stroke The pressure plate is supported by the transmission shaft, and is fixedly connected with the inner curve rotor through screws. The axial direction is limited by the shaft sleeve and the circlip. The oil suction check valve is embedded and installed in the plunger formed by the plunger and the plunger hole. In the oil suction channel communicated with the cavity, the oil discharge check valve is embedded and installed in the oil discharge channel communicated with the plunger cavity, and the high-speed digital switch valve is installed in the outer channel communicated with the plunger cavity. middle.

The oil suction check valve opens positively when the volume of the plunger cavity increases, and the low-pressure oil flows into the plunger cavity from the oil suction cavity. The oil suction hole at the tail of the valve is formed. The oil suction distribution fluid is fixedly connected with the front housing through screws. The annular groove opened in the oil suction distribution fluid is provided with O-rings on both sides of the oil suction chamber. The oil discharge check valve acts as a column. When the volume of the plug cavity decreases, the hydraulic oil is opened positively when the extrusion pressure increases to the opening pressure, and the high pressure oil is discharged from the plunger cavity through the oil discharge check valve pressure into the oil discharge cavity, and the oil discharge cavity is discharged from the rear casing. The annular oil discharge chamber and the oil discharge hole at the tail of the oil discharge check valve are composed of the annular oil discharge chamber. O-rings are installed on both sides of the oil discharge chamber of the annular groove. The oil suction chamber and the oil discharge chamber are respectively connected with the oil suction port of the pump. The high-speed digital switch valve is connected to the oil discharge port, and the high-speed digital switch valve is installed in the hole connected with the plunger cavity on the front casing. An O-ring is installed on the outer edge of the hole, one end of the valve port of the high-speed digital switch valve is connected with the plunger cavity, and the other end of the valve port is connected with the oil suction chamber. The on-off of the plunger cavity can realize the variable displacement control and adjustment of the pump based on a certain control strategy.

The number of the oil suction check valve, the oil discharge check valve and the high-speed digital switch valve corresponds to the number of plungers. The plungers are evenly distributed in the front housing in a radial manner. Both are supported and driven by the inner curve guide rail on the inner curve rotor, and at the same time, under the action of the inner curve return guide rail on the return pressure plate, the same plunger can achieve multiple oil suction and discharge reciprocation for each rotation of the inner curve rotor. The same structural principle can be adapted to multiple inner curve rotors. If multiple inner curve rotors are sequentially installed on the same transmission shaft through spline connections, the plunger, oil suction check valve, and oil discharge check valve The high-speed digital switch valve can be copied and transplanted on other inner curve rotors with similar structure principle to form a multi-row and multi-acting inner curve rotor drive digital variable radial piston pump.

Compared with the prior art, the advantages of the present invention are:

The multi-row and multi-acting inner-curve rotor-driven digital variable radial piston pump provided by the present invention has its dynamic characteristics especially suitable for low-speed and large-displacement conditions. In the low-speed driving condition, as a low-speed and large-displacement variable-control piston pump in the pump motor transmission device, it will have a very good application prospect, which solves the problem that the current conventional hydraulic pump is difficult to achieve low-speed, large-displacement and variable-displacement adjustment. Condition problems.

Description of drawings

FIG. 1 is an axial cross-sectional view of the present invention.

Fig. 2 is the overall outline drawing of the present invention and the schematic diagram of the oil suction port.

Fig. 3 is the overall outline drawing of the present invention and the schematic diagram of the oil discharge port.

FIG. 4 is a cross-sectional view of a constant acceleration and constant deceleration inner curved guide rail.

The labels in Figure 1-4 are: shaft seal 1, transmission shaft 2, O-ring 3, front end cover 4, front bearing 5, front housing 6, O-ring 7, oil suction chamber 8, oil suction check valve 9, O Ring 10, oil suction and distribution fluid 11, high-speed digital switch valve 12, O-ring 13, oil discharge check valve 14, O-ring 15, oil discharge chamber 16, rear casing 17, screw 18, return pressure plate 19, rear End cover 20, O-ring 21, circlip 22, washer 23, circlip 24, screw 25, rear bearing 26, bushing 27, oil outlet 28, plunger 29, roller 30, roller 31, inner curve Rotor 32 , gasket 33 , retaining spring 34 , oil suction port 35 , constant acceleration and constant deceleration inner curve guide 36 , constant acceleration and constant deceleration inner curve return guide 37 , plunger cavity 38 .

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings.

As shown in Figures 1, 2, 3, and 4, a multi-row multi-acting internal curve rotor drive digital variable radial piston pump includes a shaft seal 1, a transmission shaft 2, an O-ring 3, a front end cover 4, and a front bearing 5. Front housing 6, O-ring 7, oil suction chamber 8, oil suction check valve 9, O-ring 10, oil suction distribution fluid 11, high-speed digital switch valve 12, O-ring 13, oil discharge check valve 14, O-ring 15, oil discharge chamber 16, rear housing 17, screw 18, return pressure plate 19, rear end cover 20, O-ring 21, circlip 22, washer 23, circlip 24, screw 25, rear bearing 26 , bushing 27, oil outlet 28, plunger 29, roller 30, roller 31, inner curve rotor 32, gasket 33, circlip 34, oil suction port 35, constant acceleration and constant deceleration inner curve guide rail 36, constant acceleration, etc. Deceleration inner curve return guide 37.

The shaft seal 1 is installed between the transmission shaft 2 and the front end cover 4. The transmission shaft 2 is driven by the prime mover through splines, and is connected to the inner curve rotor 32 through the splines. The front end cover 4 is fixed on the front housing 6 by screws. At the same time, an O-ring 3 is installed between the front end cover 4 and the front housing 6 . The front housing 6 is supported and installed on the transmission shaft 2 by the front bearing 5, and is fixedly connected with the rear housing 17 through the screws 18. The shoulder of the casing 6, the front end cover 4, the gasket 33 and the retaining spring 34 are axially limited. The rear casing 17 is connected with the front casing 6 by the screws 18, and is supported on the transmission shaft 2 by the rear bearing 26. , the inner ring of the rear bearing 26 is installed on the transmission shaft 2, and is axially limited by the shoulder of the rear housing 17, the rear end cover 20, the gasket 23 and the circlip 22 on the transmission shaft 2, and the rear end cover 20 is limited by screws 25 is fixedly connected to the rear casing 17 , and an O-ring 21 is installed between the rear end cover 20 and the rear casing 17 .

The inner curve rotor 32 is installed on the transmission shaft 2 through spline connection, the inner curve rotor 32 is provided with an inner curve guide rail 36 with constant acceleration and constant deceleration, and the roller 30 is installed on the circular hole at the bottom of the plunger 29 through the clearance fit of the shaft hole, The roller 31 is fixedly installed on the roller 30. The roller 30 and the roller 31 are supported by the inner curve guide rail 36 with constant acceleration and constant deceleration on the inner curve rotor 32, and roll back and forth periodically on the inner curve guide rail 36. The bottom end of the plunger 29 Supported by the roller 30 and the roller 31, the head of the plunger 29 is installed in the plunger hole opened in the front housing 6 through the shaft hole clearance fit. With the rotation of the transmission shaft 2, the head of the plunger 29 is in the plunger hole. The return pressure plate 19 is supported by the transmission shaft 2, and is fixedly connected with the inner curve rotor 32 by screws. The axial direction is limited by the shaft sleeve 27 and the circlip 24. The oil suction check valve 9 is embedded and installed in the In the oil suction channel connected with the plunger cavity 38 formed by the plunger 29 and the plunger hole, the oil discharge check valve 14 is embedded and installed in the oil discharge channel communicated with the plunger cavity 38, and the high-speed digital switch valve 12 is installed. In the outer channel that communicates with the plunger cavity 38 .

The oil suction check valve 9 opens positively when the volume of the plunger cavity 38 increases, the low pressure oil flows into the plunger cavity 38 from the oil suction cavity 8, and the oil suction cavity 8 is connected by the annular groove cavity in the oil suction distribution fluid 11 and the front housing 6 The oil suction hole at the tail of the oil suction check valve 9 is formed. The oil suction distribution fluid 11 is fixedly connected with the front housing 6 through screws. The annular groove opened in the oil suction distribution fluid 11 is installed on both sides of the oil suction chamber with O-rings 7 and O-rings. 10. The oil discharge check valve 14 opens positively when the volume of the plunger cavity 38 decreases and the hydraulic oil is increased to the opening pressure by the extrusion pressure, and the high pressure oil is discharged from the plunger cavity 38 through the oil discharge check valve 14 to the discharge pressure. In the oil cavity 16, the oil discharge cavity 16 is composed of the annular oil discharge cavity opened in the rear housing 17 and the oil discharge hole at the tail of the oil discharge check valve 14. O-rings are installed on both sides of the oil discharge cavity of the annular groove. 13 and O-ring 15, the oil suction cavity 8 and the oil discharge cavity 16 communicate with the oil suction port 35 and the oil discharge port 28 of the pump respectively, and the high-speed digital switch valve 12 is installed on the front housing 6 and communicated with the plunger cavity 38. In the hole, the front housing 6 is provided with a hole that communicates the valve port of the high-speed digital switch valve 12 and the oil suction chamber 8, an O-ring is installed on the outer edge of the hole, and one end of the valve port of the high-speed digital switch valve 12 is connected to the plunger cavity 38. The other end of the valve port is connected with the oil suction chamber 8. By actively controlling the opening and closing of the valve port of the high-speed digital switch valve 12, the on-off of the oil suction chamber 8 and the plunger chamber 38 can be realized. Based on a certain control strategy, the pump can be realized Variable displacement control adjustment.

There are many oil suction check valves 9, oil discharge check valves 14 and high-speed digital switching valves 12, which correspond to the number of 29 plungers. The plungers 29 are evenly distributed in the front housing 6 in a radial direction, as shown in FIG. 1 . Only one inner curve rotor 32 is shown, and the plungers 29 are all supported and driven by the inner curve guide rail 36 on this inner curve rotor 32, and at the same time, under the action of the inner curve return guide rail 37 on the return pressure plate 19, so that Each time the inner curve rotor 32 rotates, the same plunger 29 can realize multiple reciprocating movements of oil suction and discharge. The same structural principle can be adapted to multiple inner curve rotors 32. For example, if multiple inner curve rotors 32 are installed in sequence through spline connection On the same transmission shaft 2 , the plunger 29 , the oil suction check valve 9 , the oil discharge check valve 14 and the high-speed digital switch valve 12 can be copied and transplanted on other inner curve rotors 32 with a similar structure principle to form a multi-row Multi-acting inner curve rotor driven digital variable radial piston pump.

The working process of the present invention is as follows:

Driven by wind power or other prime movers, under the support of the front and rear bearings 5 and 26, the transmission shaft 2 rotates. Since the inner curve rotor 32 and the transmission shaft 2 are connected together by splines, the inner curve rotor 32 will follow. Along with the transmission shaft 2, a rotational movement occurs together, and the inner curved guide rail 36 with constant acceleration and constant deceleration is opened on the outer edge side of the inner curved rotor 32. Due to the rotating motion of the inner curved guide rail 36 with constant acceleration and constant deceleration, the inner curved guide rail 36 is driven to be installed together with the plunger. The rollers 30 and the rollers 31 roll on the inner curved guide rail 36 with constant acceleration and constant deceleration, so that the plunger 29 performs periodic reciprocating motion in the plunger hole of the front housing 6, and the inner curved guide rail with constant acceleration and constant deceleration The force of 36 drives the lower plunger 29 to perform the forward stroke working stroke. At this time, the volume of the plunger cavity 38 is reduced. Under the forcible return of the inner curve return rail with constant acceleration and constant deceleration opened on the inner edge of the return pressure plate 19, the forward stroke working stroke is completed. The plunger 29 then performs the return movement, and the volume of the plunger cavity 38 increases at this time.

When the volume of the plunger cavity 38 increases, 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 the pressure difference between the external atmospheric pressure and the negative pressure inside the plunger cavity 38, and the low pressure The 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 decreases, the hydraulic oil inside the plunger cavity 38 is squeezed and the pressure rises. When the pressure of the hydraulic oil inside the plunger cavity 38 rises to the sum of the load pressure at the pump outlet and the opening pressure of the oil discharge check valve 14, the oil is discharged. The valve port of the one-way valve 14 is opened, and the high-pressure oil is then pumped from the plunger chamber 38 to the load circuit through the oil discharge chamber 16 and the oil discharge port 28 of the pump. Each time the inner curve rotor 32 rotates, the plunger 29 can complete multiple reciprocating motions to achieve multiple oil suction and discharge. The plurality of plungers 29 in the front housing 6 will continuously perform reciprocating motion to suck and discharge oil, so as to realize the functions of sucking low-pressure oil and discharging high-pressure oil of the pump.

When the high-speed digital switch valve 12 is powered off and does not work, the oil suction and discharge function of the pump is completed by the oil suction check valve 9 and the oil discharge check valve 14. At this time, the pump is used as a quantitative pump and works at the maximum displacement condition. When the pump needs variable displacement adjustment, before the volume reduction of the plunger cavity 38 starts, by energizing the high-speed digital switch valve 12 corresponding to the plunger cavity 38, the valve port of the high-speed digital switch valve 12 is driven to open, and the plunger The volume of the cavity 38 is reduced. During the forward stroke of the plunger 29, the hydraulic oil in the plunger cavity 38 will be returned to the oil suction cavity 8 of the pump through the valve port of the open high-speed digital switch valve 12, which is externally represented as the plunger cavity. 38 The function of pressing and discharging high-pressure oil fails, and the high-pressure oil flow output by the oil discharge port 28 of the pump is reduced, that is, the displacement of the pump is adjusted to a smaller level. The power-on and power-off state and power-on and power-off sequence of each high-speed digital switch valve 12 can realize the smooth change and regulation of the pump displacement from the maximum displacement to the zero displacement approximately linearly.

The content described in the embodiments of the present specification is only an enumeration of the realization forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present invention also covers those skilled in the art Equivalent technical means conceivable according to the inventive concept.

Claims (6)

1. a multi-row multi-acting inner curve rotor drive digital variable radial piston pump is characterized in that: comprise a casing, the middle of the casing is rotatably installed with a transmission shaft controlled by a prime mover, and the casing and the transmission shaft An annular cavity is formed between them; the annular cavity is provided with an inner curved rotor that is fixedly sleeved on the transmission shaft through spline connection, and the casing is provided with a number of radially spaced radially spaced plunger holes. The annular outer wall of the rotor is provided with an annular groove corresponding to the position of the plunger hole, and the bottom of the annular groove is connected with an annular guide rail cavity. Inner curve return rail; A plunger is installed in each plunger hole, the bottom of the plunger is inserted into the guide rail cavity after passing through the annular groove, and the insertion end of the plunger is provided with a transverse hole, and a roller is rotatably installed in the transverse hole. The ends are respectively fixed with rollers. When the inner curve rotor rotates with the transmission shaft, each roller reciprocates and periodically rolls along the inner curve guide rail with constant acceleration and constant deceleration in the guide rail cavity. Reciprocating up and down movement in the plug hole; The casing is provided with an annular oil suction cavity on one side of the plunger hole, and an annular oil discharge cavity on the other side of the plunger hole. An oil discharge port connected with the cavity; an oil suction channel is respectively connected with the oil suction cavity and each plunger hole, and an oil discharge channel is respectively connected with the oil discharge cavity and each plunger hole; each oil suction channel is installed in There is an oil suction check valve, and each oil discharge channel is equipped with an oil discharge check valve; a cross-shaped channel is formed between the corresponding oil suction channel, oil discharge channel and the plunger hole, and the top part of each cross-shaped channel is installed There are high-speed digital switch valves; the middle part of each cross-shaped channel is enclosed by the corresponding oil suction check valve, oil discharge check valve, plunger and high-speed digital switch valve to form a closed plunger cavity; each high-speed digital switch valve One end of the valve port is communicated with the corresponding plunger cavity, and the other end is communicated with the corresponding oil suction cavity. 2. The multi-row and multi-acting inner-curve rotor-driven digital variable radial piston pump according to claim 1, wherein the casing comprises a front casing and a rear casing respectively rotatably mounted on the transmission shaft, The front and rear casings are butted and fixedly connected as a whole; the outer side of the front casing is fixedly connected with a front end cover sleeved on the transmission shaft, and the outer side of the rear casing is fixedly connected with a rear end cover sleeved on the transmission shaft; the front end cover and the transmission shaft are fixedly connected A shaft seal is installed between them. 3. A kind of multi-row and multi-acting inner curve rotor drive digital variable radial piston pump according to claim 2, it is characterized in that: the inner curve rotor is installed on the transmission shaft by spline rotation, and the inner curve rotor annular outer wall is The outer edge part is provided with an open annular step 1, the outer side of the inner curve rotor is fixed with an annular return pressure plate sleeved on the transmission shaft, and the part of the return pressure plate corresponding to the annular step 1 is provided with an annular step 2, and the annular step 2 and the inner The annular steps of the curved rotor form an annular groove; the two sides of the bottom of the annular groove are respectively provided with annular steps to form an annular guide rail cavity. The inner curve return guide is located on the return platen. 4. A multi-row and multi-acting inner-curve rotor-driven digital variable radial piston pump according to claim 2, characterized in that: an oil-absorbing and distributing fluid is fixed on the outside of the front casing, and an annular groove is provided on the oil-absorbing and distributing fluid. An oil suction cavity is formed between the annular groove cavity and the front housing. 5. A multi-row multi-acting inner-curve rotor-driven digital variable radial piston pump according to claim 4, characterized in that: between the front end cover and the front casing, between the rear end cover and the rear casing, and O-rings are installed on the upper and lower sides of the oil suction chamber between the oil suction flow fitting and the front casing, and on the upper and lower sides of the oil discharge chamber between the front casing and the rear casing. 6. a kind of multi-row multi-action inner curve rotor drive digital variable radial piston pump according to claim 1, it is characterized in that: the inner curve section of inner curve return guide rail is equal acceleration and equal deceleration inner curve, cosine acceleration motion The inner curve of the law, the inner curve of the sine acceleration movement law, the inner curve of the trapezoidal acceleration movement law or the inner curve of the parabolic acceleration movement law.

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