CN111502950A - Efficient high-precision bidirectional flow distribution method for linear hydraulic pump - Google Patents
Efficient high-precision bidirectional flow distribution method for linear hydraulic pump Download PDFInfo
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- CN111502950A CN111502950A CN202010343998.0A CN202010343998A CN111502950A CN 111502950 A CN111502950 A CN 111502950A CN 202010343998 A CN202010343998 A CN 202010343998A CN 111502950 A CN111502950 A CN 111502950A
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- hydraulic pump
- linear actuator
- electromagnetic linear
- flow
- motion
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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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
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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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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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
- F04B51/00—Testing 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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetic Pumps, Or The Like (AREA)
Abstract
The invention relates to a high-efficiency and high-precision bidirectional flow distribution method for a linear hydraulic pump, which comprises an electromagnetic linear actuator, a displacement sensor, a hydraulic pump, an active check valve group and a controller, and is characterized in that: an electromagnetic linear actuator is adopted to directly drive a hydraulic pump, so that the volume of a working cavity of the hydraulic pump is changed; the controller controls the motion of the electromagnetic linear actuator in real time according to the displacement signal of the electromagnetic linear actuator acquired by the displacement sensor, and controls the active one-way valve group to be opened and closed at the same time, wherein a liquid inlet valve in the valve group is opened in the process of increasing the volume of the working cavity, and a liquid outlet valve is opened in the process of reducing the volume of the working cavity; the invention changes the arrangement of a liquid inlet valve and a liquid outlet valve in the active one-way valve group to change the output flow direction, adjusts the opening/closing phase of the active one-way valve to improve the efficiency, controls the motion curve of the electromagnetic linear actuator in real time to inhibit flow fluctuation, and controls the motion amplitude and the stroke of the electromagnetic linear actuator to realize the accurate control of the output flow of the hydraulic pump.
Description
Technical Field
The invention relates to the technical field of linear hydraulic pumps, in particular to a flow distribution method of a linear hydraulic pump.
Background
The plunger pump has the advantages of high rated pressure, compact structure, large driving power, long service life, variable flow and the like, and is widely applied to the fields of engineering machinery, aerospace and the like. At present, the most commonly used plunger pump is generally a swash plate type plunger pump, and has the defects of complex structure, more friction pairs, low power density, poorer heat dissipation condition and insufficient dynamic response performance, thereby limiting the further expansion of the application field of the plunger pump.
With the development of a linear direct drive technology and a sensor technology, a linear motor is adopted to directly drive a piston of the plunger pump, so that a mechanical motion conversion mechanism is eliminated, and electromagnetic direct drive becomes an important trend of efficient oil pumping of the plunger pump. However, the hydraulic cylinder of the hydraulic pump driven by the linear motor completes the pumping work of the pump under the reciprocating action of the linear motor, so as to realize the unidirectional transmission of fluid, and how to realize the bidirectional fluid transmission of the linear driving hydraulic pump becomes a technical difficulty. In addition, the passive one-way valve is widely applied to the hydraulic pump and is mature in technology, but the working efficiency of the hydraulic pump is further improved due to the delay of opening and closing of the passive one-way valve.
The invention relates to a high-efficiency high-precision bidirectional flow distribution method for a linear hydraulic pump, which is characterized in that an electromagnetic linear actuator is adopted to directly drive the hydraulic pump, a controller controls the motion of the electromagnetic linear actuator in real time according to a displacement signal of the electromagnetic linear actuator acquired by a displacement sensor, and simultaneously controls an active one-way valve group to be opened and closed, so that bidirectional flow distribution is realized; the efficiency is improved by adjusting the opening/closing phase of the active one-way valve, the movement curve of the electromagnetic linear actuator is controlled to inhibit flow fluctuation, and the movement amplitude and the stroke of the electromagnetic linear actuator are controlled in real time to realize the accurate control of the output flow of the hydraulic pump.
Disclosure of Invention
A high-efficiency and high-precision bidirectional flow distribution method for a linear hydraulic pump is designed, an electromagnetic linear actuator is adopted to directly drive the hydraulic pump, a controller controls the motion of the electromagnetic linear actuator in real time according to a displacement signal of the electromagnetic linear actuator acquired by a displacement sensor, and an active one-way valve group is controlled to be opened and closed at the same time, so that bidirectional flow distribution is realized; the efficiency is improved by adjusting the opening/closing phase of the active one-way valve, the movement curve of the electromagnetic linear actuator is controlled to inhibit flow fluctuation, and the movement amplitude and the stroke of the electromagnetic linear actuator are controlled in real time to realize the accurate control of the output flow of the hydraulic pump.
The utility model provides a two-way flow distribution method of high-efficient high accuracy straight line hydraulic pump, includes initiative check valve group (1), hydraulic pump working chamber (2), electromagnetism linear actuator (3), displacement sensor (4) and controller (5), its characterized in that includes: the electromagnetic linear actuator (3) directly drives the hydraulic pump to change the volume of a working cavity (2) of the hydraulic pump; the controller (5) controls the motion of the electromagnetic linear actuator (3) in real time according to the displacement signal of the electromagnetic linear actuator (3) acquired by the displacement sensor (4), and controls the opening and closing of the active one-way valve group (1) at the same time; the active one-way valve group (1) comprises a liquid inlet valve and a liquid outlet valve, wherein the liquid inlet valve is opened in the process of increasing the volume of the hydraulic pump working cavity (2), and the liquid outlet valve is opened in the process of reducing the volume of the hydraulic pump working cavity (2); the motion process curve of the electromagnetic linear actuator (3) is controlled by the controller (5) in real time to inhibit the flow fluctuation of the hydraulic pump, and the motion amplitude and frequency of the electromagnetic linear actuator (3) are controlled in real time to accurately adjust the output flow of the hydraulic pump; the liquid outlet valve and the liquid inlet valve in the active one-way valve group (1) are arranged in a mutual exchange manner, so that the output flow direction of the linear hydraulic pump is changed; the motion phase of the liquid outlet valve and the liquid inlet valve is adjusted to improve the output efficiency of the hydraulic pump.
The electromagnetic linear actuator (3) adopts a Halbach permanent magnet array to improve the air gap flux density, and a rotor of the electromagnetic linear actuator (3) is of a moving coil type or a moving magnet type.
The active one-way valve group (1) comprises normally closed one-way valves of a liquid inlet valve and a liquid outlet valve, and the number of the liquid inlet valve and the number of the liquid outlet valves are equal to or not less than 1.
The accurate regulation of the output flow of the hydraulic pump comprises the following steps: the output flow of the hydraulic pump is rapidly adjusted due to the adjustment of the movement frequency of the electromagnetic linear actuator (3) and the output flow of the hydraulic pump is slightly adjusted due to the adjustment of the movement amplitude of the electromagnetic linear actuator (3).
The relation between the motion curve of the electromagnetic linear actuator (3) and flow fluctuation, the relation between the motion amplitude and frequency of the electromagnetic linear actuator (3) and flow, and the relation between the motion phase and flow of the active check valve group (1) need to be obtained off line.
The flow distribution method comprises the following specific flow distribution steps:
s1: setting valves in the active one-way valve group (1) as a liquid outlet valve and a liquid inlet valve respectively according to the flow direction in the flow instruction;
s2: setting a motion curve, an amplitude and a frequency of the electromagnetic linear actuator (3) according to the flow instruction, and initializing a motion phase of the active check valve group (1);
s3: the volume of a working cavity (2) of the lower hydraulic pump is driven to change by the electromagnetic linear actuator (3), and the active check valve group (1) operates according to set parameters;
s4: if the flow rate does not reach the command target value, adjusting the motion frequency of the actuator;
s5: if the flow does not reach the command target value after the actuator movement frequency is adjusted, adjusting the actuator movement frequency amplitude;
s6: if the flow command changes, repeating S1 to S5, otherwise continuing until the end.
The invention relates to a high-efficiency high-precision bidirectional flow distribution method for a linear hydraulic pump, which is characterized in that an electromagnetic linear actuator is adopted to directly drive the hydraulic pump, a controller controls the motion of the electromagnetic linear actuator in real time according to a displacement signal of the electromagnetic linear actuator acquired by a displacement sensor, and simultaneously controls an active one-way valve group to be opened and closed, so that bidirectional flow distribution is realized; the efficiency is improved by adjusting the opening/closing phase of the active one-way valve, the movement curve of the electromagnetic linear actuator is controlled to inhibit flow fluctuation, and the movement amplitude and the stroke of the electromagnetic linear actuator are controlled in real time to realize the accurate control of the output flow of the hydraulic pump.
According to the efficient and high-precision bidirectional flow distribution method for the linear hydraulic pump, the electromagnetic linear actuator is used as the driving unit, a motion conversion mechanism from rotation to linear is cancelled, the actuator outputs driving force to directly act and compress, volume servo control is achieved, the power transmission path is short, and high efficiency and energy conservation are achieved; the linear motor adopting the Halbach permanent magnet array effectively enhances the strength of a radial magnetic field in an air gap, improves the driving force and the response speed of the electromagnetic linear actuator, and is beneficial to improving the dynamic response performance of a hydraulic pump.
According to the efficient and high-precision bidirectional flow distribution method for the linear hydraulic pump, the controller controls the exciting current in the linear motor coil, and the adjustment of the motion amplitude and the frequency of the electromagnetic linear actuator is realized through the current control, so that the accurate control of the output flow and the pressure of the hydraulic pump is realized.
According to the efficient and high-precision bidirectional flow distribution method for the linear hydraulic pump, the arrangement of the liquid outlet valve and the liquid inlet valve in the active one-way valve group is changed, so that the output flow direction of the linear hydraulic pump is changed, and the bidirectional flow distribution of the linear hydraulic pump is realized; when the hydraulic pump actuates at a high speed, the active one-way valve group is controlled by the controller, the response is fast, and the motion phases of the liquid outlet valve and the liquid inlet valve are adjustable so as to improve the output efficiency of the hydraulic pump.
The efficient and high-precision bidirectional flow distribution method for the linear hydraulic pump has the advantages of compact structure, high working efficiency, quick response, high control precision and the like, and brings huge economic benefits after being put into industrial application.
Drawings
FIG. 1 is a schematic diagram of a system required by the bidirectional flow distribution method of the high-efficiency and high-precision linear hydraulic pump.
Fig. 2 shows the implementation steps of the bidirectional flow distribution method of the high-efficiency and high-precision linear hydraulic pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 2, a high-efficiency and high-precision bidirectional flow distribution method for a linear hydraulic pump includes an active check valve set (1), a hydraulic pump working chamber (2), an electromagnetic linear actuator (3), a displacement sensor (4) and a controller (5), and is characterized by including: the electromagnetic linear actuator (3) directly drives the hydraulic pump to change the volume of the working cavity (2) of the hydraulic pump; the controller (5) controls the motion of the electromagnetic linear actuator (3) in real time according to the displacement signal of the electromagnetic linear actuator (3) acquired by the displacement sensor (4), and controls the opening and closing of the active one-way valve group (1) at the same time; the active one-way valve group (1) comprises a liquid inlet valve and a liquid outlet valve, wherein the liquid inlet valve is opened in the process of increasing the volume of the hydraulic pump working cavity (2), and the liquid outlet valve is opened in the process of reducing the volume of the hydraulic pump working cavity (2); the motion process curve of the electromagnetic linear actuator (3) is controlled by the controller (5) in real time to inhibit the flow fluctuation of the hydraulic pump, and the motion amplitude and frequency of the electromagnetic linear actuator (3) are controlled in real time to accurately adjust the output flow of the hydraulic pump; the liquid outlet valve and the liquid inlet valve in the active one-way valve group (1) are arranged in a mutual exchange manner, so that the output flow direction of the linear hydraulic pump is changed; the motion phase of the liquid outlet valve and the liquid inlet valve is adjusted to improve the output efficiency of the hydraulic pump.
The electromagnetic linear actuator (3) adopts a Halbach permanent magnet array to improve the air gap flux density, and a rotor of the electromagnetic linear actuator (3) is of a moving coil type or a moving magnet type.
The active one-way valve group (1) comprises normally closed one-way valves of a liquid inlet valve and a liquid outlet valve, and the number of the liquid inlet valve and the number of the liquid outlet valves are equal to or not less than 1.
The accurate regulation of the output flow of the hydraulic pump comprises the following steps: the output flow of the hydraulic pump is rapidly adjusted due to the adjustment of the movement frequency of the electromagnetic linear actuator (3) and the output flow of the hydraulic pump is slightly adjusted due to the adjustment of the movement amplitude of the electromagnetic linear actuator (3).
The relation between the motion curve of the electromagnetic linear actuator (3) and flow fluctuation, the relation between the motion amplitude and frequency of the electromagnetic linear actuator (3) and flow, and the relation between the motion phase and flow of the active check valve group (1) need to be obtained off line.
The flow distribution method comprises the following specific flow distribution steps:
s1: setting valves in the active one-way valve group (1) as a liquid outlet valve and a liquid inlet valve respectively according to the flow direction in the flow instruction;
s2: setting a motion curve, an amplitude and a frequency of the electromagnetic linear actuator (3) according to the flow instruction, and initializing a motion phase of the active check valve group (1);
s3: the volume of a working cavity (2) of the lower hydraulic pump is driven to change by the electromagnetic linear actuator (3), and the active check valve group (1) operates according to set parameters;
s4: if the flow rate does not reach the command target value, adjusting the motion frequency of the actuator;
s5: if the flow does not reach the command target value after the actuator movement frequency is adjusted, adjusting the actuator movement frequency amplitude;
s6: if the flow command changes, repeating S1 to S5, otherwise continuing until the end.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a two-way flow distribution method of high-efficient high accuracy straight line hydraulic pump, includes initiative check valve group (1), hydraulic pump working chamber (2), electromagnetism linear actuator (3), displacement sensor (4) and controller (5), its characterized in that includes: the electromagnetic linear actuator (3) directly drives the hydraulic pump to change the volume of the working cavity (2) of the hydraulic pump; the controller (5) controls the motion of the electromagnetic linear actuator (3) in real time according to the displacement signal of the electromagnetic linear actuator (3) acquired by the displacement sensor (4), and controls the opening and closing of the active one-way valve group (1) at the same time; the active one-way valve group (1) comprises a liquid inlet valve and a liquid outlet valve, wherein the liquid inlet valve is opened in the process of increasing the volume of the hydraulic pump working cavity (2), and the liquid outlet valve is opened in the process of reducing the volume of the hydraulic pump working cavity (2); the motion process curve of the electromagnetic linear actuator (3) is controlled by the controller (5) in real time to inhibit the flow fluctuation of the hydraulic pump, and the motion amplitude and frequency of the electromagnetic linear actuator (3) are controlled in real time to accurately adjust the output flow of the hydraulic pump; the liquid outlet valve and the liquid inlet valve in the active one-way valve group (1) are arranged in a mutual exchange manner, so that the output flow direction of the linear hydraulic pump is changed; the motion phase of the liquid outlet valve and the liquid inlet valve is adjusted to improve the output efficiency of the hydraulic pump.
2. The efficient and high-precision bidirectional flow distribution method of the linear hydraulic pump according to claim 1, characterized in that the electromagnetic linear actuator (3) adopts a Halbach permanent magnet array to improve the air gap flux density, and a rotor of the electromagnetic linear actuator (3) is of a moving coil type or a moving magnet type.
3. The method for bidirectional flow distribution of a high-efficiency and high-precision linear hydraulic pump according to claim 1, characterized in that the active check valve set (1) comprises normally closed check valves having the same number of inlet valves and outlet valves not less than 1.
4. The bidirectional flow distribution method of the high-efficiency high-precision linear hydraulic pump according to claim 1, characterized in that the precise regulation of the output flow of the hydraulic pump comprises: the output flow of the hydraulic pump is rapidly adjusted due to the adjustment of the movement frequency of the electromagnetic linear actuator (3) and the output flow of the hydraulic pump is slightly adjusted due to the adjustment of the movement amplitude of the electromagnetic linear actuator (3).
5. The bidirectional flow distribution method of the linear hydraulic pump with high efficiency and high precision according to claim 1, characterized in that the relationship between the motion curve of the electromagnetic linear actuator (3) and the flow fluctuation, the relationship between the motion amplitude and the frequency of the electromagnetic linear actuator (3) and the flow, and the relationship between the motion phase and the flow of the active check valve group (1) need to be obtained off-line.
6. The bidirectional flow distribution method of the high-efficiency and high-precision linear hydraulic pump according to claim 1, characterized by comprising the following specific flow distribution steps:
s1: setting valves in the active one-way valve group (1) as a liquid outlet valve and a liquid inlet valve respectively according to the flow direction in the flow instruction;
s2: setting a motion curve, an amplitude and a frequency of the electromagnetic linear actuator (3) according to the flow instruction, and initializing a motion phase of the active check valve group (1);
s3: the volume of a working cavity (2) of the lower hydraulic pump is driven to change by the electromagnetic linear actuator (3), and the active check valve group (1) operates according to set parameters;
s4: if the flow rate does not reach the command target value, adjusting the motion frequency of the actuator;
s5: if the flow does not reach the command target value after the actuator movement frequency is adjusted, adjusting the actuator movement frequency amplitude;
s6: if the flow command changes, repeating S1 to S5, otherwise continuing until the end.
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| CN202010343998.0A CN111502950B (en) | 2020-04-27 | 2020-04-27 | Efficient and high-precision bidirectional flow distribution method for linear hydraulic pump |
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| CN202010343998.0A CN111502950B (en) | 2020-04-27 | 2020-04-27 | Efficient and high-precision bidirectional flow distribution method for linear hydraulic pump |
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| CN111502950B CN111502950B (en) | 2023-06-23 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08177745A (en) * | 1994-12-21 | 1996-07-12 | Hitachi Constr Mach Co Ltd | Hydraulic pump flow rate control device |
| CN101136576A (en) * | 2006-08-15 | 2008-03-05 | 张玉宝 | Magnetic resistance type linear oscillating motor and integrated application device and multi-core mover |
| CN202182003U (en) * | 2011-08-02 | 2012-04-04 | 天津蹊径动力技术有限公司 | Forced vibration linear motor driving plunger pump |
| CN203404031U (en) * | 2013-08-12 | 2014-01-22 | 东台市明峰机械制造有限公司 | Single-cylinder double-acting slurry delivery pump |
| CN203463248U (en) * | 2013-08-29 | 2014-03-05 | 宝鸡石油机械有限责任公司 | Double-acting multi-cylinder mud pump directly driven by linear motors |
| CN105508330A (en) * | 2016-01-12 | 2016-04-20 | 浙江大学 | Electromagnet-driven digital hydraulic servo actuator |
| CN108757374A (en) * | 2018-06-05 | 2018-11-06 | 华中科技大学 | Two-sided permanent magnet straight line motor drive type plunger pump |
-
2020
- 2020-04-27 CN CN202010343998.0A patent/CN111502950B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08177745A (en) * | 1994-12-21 | 1996-07-12 | Hitachi Constr Mach Co Ltd | Hydraulic pump flow rate control device |
| CN101136576A (en) * | 2006-08-15 | 2008-03-05 | 张玉宝 | Magnetic resistance type linear oscillating motor and integrated application device and multi-core mover |
| CN202182003U (en) * | 2011-08-02 | 2012-04-04 | 天津蹊径动力技术有限公司 | Forced vibration linear motor driving plunger pump |
| CN203404031U (en) * | 2013-08-12 | 2014-01-22 | 东台市明峰机械制造有限公司 | Single-cylinder double-acting slurry delivery pump |
| CN203463248U (en) * | 2013-08-29 | 2014-03-05 | 宝鸡石油机械有限责任公司 | Double-acting multi-cylinder mud pump directly driven by linear motors |
| CN105508330A (en) * | 2016-01-12 | 2016-04-20 | 浙江大学 | Electromagnet-driven digital hydraulic servo actuator |
| CN108757374A (en) * | 2018-06-05 | 2018-11-06 | 华中科技大学 | Two-sided permanent magnet straight line motor drive type plunger pump |
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| CN111502950B (en) | 2023-06-23 |
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