CN114320810A - Control method for restraining flow pulsation of axial plunger pump - Google Patents
Control method for restraining flow pulsation of axial plunger pump Download PDFInfo
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- CN114320810A CN114320810A CN202111360574.6A CN202111360574A CN114320810A CN 114320810 A CN114320810 A CN 114320810A CN 202111360574 A CN202111360574 A CN 202111360574A CN 114320810 A CN114320810 A CN 114320810A
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- 230000010349 pulsation Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000000452 restraining effect Effects 0.000 title description 2
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 5
- 230000002829 reductive effect Effects 0.000 description 9
- 238000001595 flow curve Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention discloses a control method for inhibiting flow pulsation of an axial plunger pump, which comprises the following steps: acquiring an initial rotor phase angle and an initial swash plate inclination angle of the axial plunger pump; taking the initial rotor phase angle as the current rotor phase angle; taking the initial inclined angle of the swash plate as the current inclined angle of the swash plate; determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate; when the absolute value of the difference value between the current flow and the flow threshold value is larger than the difference threshold value, determining the target rotating speed of a swash plate in the axial plunger pump according to the current rotor phase angle and the current swash plate inclination angle; the rotational speed of the swash plate is used to control the rate of change of the inclination angle of the swash plate; the swash plate angle is used to control the flow rate of the axial piston pump. The invention reduces the flow pulsation by adjusting the inclination angle of the swash plate, thereby reducing the damage to the axial plunger pump.
Description
Technical Field
The invention relates to the technical field of electro-hydraulic control, in particular to a control method for inhibiting flow pulsation of an axial plunger pump.
Background
The axial plunger pump is a swash plate type axial plunger pump which adopts an oil distribution disc to distribute oil, a cylinder body rotates and depends on variable head variables. The pump has the advantages of simple structure, small volume, low noise, high efficiency, long service life, self-absorption capacity and the like, and is widely applied to machines such as machine tool forging, metallurgy, engineering, mines, ships and the like and other hydraulic transmission systems. However, the existing axial plunger pump has large flow pulsation when in use, and the system vibration is caused by the vibration caused by the flow pulsation, so that the environmental noise is increased, and the working reliability of the system is reduced. In order to improve the operational reliability of the system and to improve the man-machine friendly environment of the device, it is necessary to reduce the flow pulsation of the plunger pump from the source.
Disclosure of Invention
The invention aims to provide a control method for inhibiting flow pulsation of an axial plunger pump, which reduces the flow pulsation by adjusting the inclination angle of a swash plate so as to reduce damage to the axial plunger pump.
In order to achieve the purpose, the invention provides the following scheme:
a control method of damping axial ram pump flow pulsations comprising:
acquiring an initial rotor phase angle and an initial swash plate inclination angle of the axial plunger pump;
taking the initial rotor phase angle as a current rotor phase angle; taking the initial swash plate inclination angle as a current swash plate inclination angle;
determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate;
when the absolute value of the difference value between the current flow and the flow threshold value is larger than the difference threshold value, determining the target rotating speed of a swash plate in the axial plunger pump according to the current rotor phase angle and the current swash plate inclination angle; the rotating speed of the swash plate is used for controlling the change rate of the inclination angle of the swash plate; the swash plate inclination angle is used to control the flow rate of the axial piston pump.
Optionally, after determining the target rotating speed of the swash plate in the axial piston pump, the method further includes:
adjusting the rotating speed of a swash plate in the axial piston pump to the target rotating speed; and taking the rotor phase angle of the plunger pump at the next moment as the current rotor phase angle, taking the inclined angle of the swash plate of the plunger pump at the next moment as the current inclined angle of the swash plate, and returning to the step of determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate.
Optionally, the determination formula of the current flow rate of the axial plunger pump is as follows:
wherein Q isGeneral assemblyThe current flow of the axial plunger pump is shown, A is the area of the plunger cavity, R is the rotation radius of the plunger,
the current rotor phase angle is in the value range of
Theta is the current swash plate angle and t is time.
Optionally, the determination formula of the rotation speed of the swash plate is as follows:
where Δ v is a target rotational speed of the swash plate, J is a first amplification factor, and H is a constant; g is a second amplification factor.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a control method for inhibiting flow pulsation of an axial plunger pump, which comprises the following steps: acquiring an initial rotor phase angle and an initial swash plate inclination angle of the axial plunger pump; taking the initial rotor phase angle as the current rotor phase angle; taking the initial inclined angle of the swash plate as the current inclined angle of the swash plate; determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate; when the absolute value of the difference value between the current flow and the flow threshold value is larger than the difference threshold value, determining the target rotating speed of a swash plate in the axial plunger pump according to the current rotor phase angle and the current swash plate inclination angle; the rotational speed of the swash plate is used to control the rate of change of the inclination angle of the swash plate; the swash plate angle is used to control the flow rate of the axial piston pump. The invention reduces the flow pulsation by adjusting the inclination angle of the swash plate, thereby reducing the damage to the axial plunger pump.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of a control method for suppressing flow pulsation of an axial plunger pump according to an embodiment of the present invention;
FIG. 2 is a graph of the inclination angle of the swash plate in the embodiment of the present invention;
FIG. 3 is a flow chart of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a control method for inhibiting flow pulsation of an axial plunger pump, which reduces the flow pulsation by adjusting the inclination angle of a swash plate so as to reduce damage to the axial plunger pump.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a control method for suppressing flow pulsation of an axial plunger pump according to an embodiment of the present invention, and as shown in fig. 1, the present invention provides a control method for suppressing flow pulsation of an axial plunger pump, including:
step 101: acquiring an initial rotor phase angle and an initial swash plate inclination angle of the axial plunger pump;
step 102: taking the initial rotor phase angle as the current rotor phase angle; taking the initial inclined angle of the swash plate as the current inclined angle of the swash plate;
step 103: determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate;
step 104: when the absolute value of the difference value between the current flow and the flow threshold value is larger than the difference threshold value, determining the target rotating speed of a swash plate in the axial plunger pump according to the current rotor phase angle and the current swash plate inclination angle; the rotational speed of the swash plate is used to control the rate of change of the inclination angle of the swash plate; the swash plate angle is used to control the flow rate of the axial piston pump.
After step 104, further comprising:
adjusting the rotating speed of a swash plate in the axial plunger pump to a target rotating speed; and taking the rotor phase angle of the plunger pump at the next moment as the current rotor phase angle, taking the inclination angle of the swash plate of the plunger pump at the next moment as the current inclination angle of the swash plate, and returning to step 103.
The current flow rate of the axial plunger pump is determined by the formula:
wherein Q isGeneral assemblyThe current flow of the axial plunger pump is shown, A is the area of the plunger cavity, R is the rotation radius of the plunger,
the current rotor phase angle is in the value range of
The flow pulsation period of the six-plunger axial plunger pump is
Theta is the current swash plate angle and t is time.
The rotational speed of the swash plate is determined by the formula:
where Δ v is a target rotational speed of the swash plate, J is a first amplification factor, and H is a constant; g is a second amplification factor.
Specifically, in the invention, after the structure of the plunger pump is determined, a functional relationship exists between the flow pulsation rate and the inclination angle of the swash plate, and in the working process, the angle of the swash plate is dynamically adjusted according to a certain functional relationship, so that the purpose of reducing flow pulsation can be realized. When the rotor of the plunger pump starts to work, oil enters the plunger cavity, and because the motion of the plunger is a sine curve, the flow is regulated to be stable by changing the inclination angle of the swash plate under the condition of unchanged rotating speed. The inclination angle curve chart of the front and the rear swash plates added with the swash plate angle adjusting device is shown in figure 2; the front and rear flow curve diagrams of the swash plate angle adjusting device are shown in FIG. 3; in fig. 2, the abscissa is time, and the ordinate is the inclination angle of the swash plate; the straight line is the inclination angle of the swash plate before the swash plate angle adjusting device is added, the curve is the inclination angle of the swash plate after the swash plate angle adjusting device is added, and in fig. 3, the abscissa is time and the ordinate is flow; the curve is the inclination angle of the swash plate before the swash plate angle adjusting device is added, and the straight line is the inclination angle of the swash plate after the swash plate angle adjusting device is added, as can be seen from fig. 2-3, the inclination angle of the swash plate before the swash plate angle adjusting device is added is not adjustable, the flow pulse is large, the inclination angle of the swash plate after the controller is added is adjustable, and the flow pulse tends to be stable.
Plunger displacement curve:
plunger velocity profile:
single plunger flow curve:
plunger flow curve:
wherein Q isGeneral assemblyThe current flow of the axial plunger pump is shown, A is the area of the plunger cavity, R is the rotation radius of the plunger,
is the current rotor phase angle, θ is the current swash plate angle, and t is time.
The existing axial plunger pump is usually used under a high-pressure working condition, and further influences pressure pulsation under the condition of flow pulsation, so that elements are easily damaged, and finally the safety of a system is influenced. The present invention utilizes the change in the angle of inclination of the swash plate to reduce flow pulsations. In the design, the flow is idealized, so that the pulsation amplitude of the element flow can be reduced, the vibration of the element can be effectively reduced, the energy consumption can be reduced, and the service life of the element can be prolonged. The influence of flow pulsation on elements and systems is effectively reduced.
In summary, the invention has the following advantages:
1. when the plunger pump starts to operate, the current phase is measured, and then the purpose of flow stabilization is achieved by feedback control of the swash plate.
2. The speed of the swash plate is controlled after the controller amplifies the signal, and the swash plate angle is not directly controlled, so that the flow pulsation is more effectively reduced.
In addition, the invention adopts closed-loop control, thus improving the stability of elements and systems; the controller and the phase sensor are integrated together to realize modular design; after the inclination angle of the swash plate is reduced, the load of the motor is reduced, and the energy-saving loop for energy recovery by adopting the servo motor and the energy accumulator recovers the self-gravitational potential energy, so that the energy is saved and the emission is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A control method for damping axial plunger pump flow pulsations, characterized in that the method comprises:
acquiring an initial rotor phase angle and an initial swash plate inclination angle of the axial plunger pump;
taking the initial rotor phase angle as a current rotor phase angle; taking the initial swash plate inclination angle as a current swash plate inclination angle;
determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate;
when the absolute value of the difference value between the current flow and the flow threshold value is larger than the difference threshold value, determining the target rotating speed of a swash plate in the axial plunger pump according to the current rotor phase angle and the current swash plate inclination angle; the rotating speed of the swash plate is used for controlling the change rate of the inclination angle of the swash plate; the swash plate inclination angle is used to control the flow rate of the axial piston pump.
2. The control method for suppressing flow pulsation of an axial plunger pump according to claim 1, further comprising, after the determining the target rotational speed of the swash plate in the axial plunger pump:
adjusting the rotating speed of a swash plate in the axial piston pump to the target rotating speed; and taking the rotor phase angle of the plunger pump at the next moment as the current rotor phase angle, taking the inclined angle of the swash plate of the plunger pump at the next moment as the current inclined angle of the swash plate, and returning to the step of determining the current flow of the axial plunger pump according to the current rotor phase angle and the current inclined angle of the swash plate.
3. The control method for suppressing flow pulsation of an axial plunger pump according to claim 2, wherein the current flow of the axial plunger pump is determined by the formula:
wherein Q isGeneral assemblyThe current flow of the axial plunger pump is shown, A is the area of the plunger cavity, R is the rotation radius of the plunger,
the current rotor phase angle is in the value range of
Theta is the current swash plate angle and t is time.
4. The control method for suppressing flow pulsation of an axial plunger pump according to claim 3, wherein the rotational speed of the swash plate is determined by the formula:
where Δ v is a target rotational speed of the swash plate, J is a first amplification factor, and H is a constant; g is a second amplification factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111360574.6A CN114320810A (en) | 2021-11-17 | 2021-11-17 | Control method for restraining flow pulsation of axial plunger pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111360574.6A CN114320810A (en) | 2021-11-17 | 2021-11-17 | Control method for restraining flow pulsation of axial plunger pump |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007104257A1 (en) * | 2006-03-14 | 2007-09-20 | Zhu Raphael | An axial plunger pump or motor |
| CN101240794A (en) * | 2008-03-14 | 2008-08-13 | 贵州大学 | Method and device for reducing axial plunger pump geometric flow pulsation |
| CN101487458A (en) * | 2008-07-14 | 2009-07-22 | 张全根 | Axial variable displacement plunger pump of swash plate |
| CN203452989U (en) * | 2013-08-06 | 2014-02-26 | 吉林大学 | Single-swash-plate staggered phase bidirectional plunger pump |
| CN105587481A (en) * | 2016-03-04 | 2016-05-18 | 沈阳化工大学 | High-speed variable-displacement axial plunger pump |
| CN107084107A (en) * | 2017-06-22 | 2017-08-22 | 杭州力龙液压有限公司 | A kind of electronic sensor control plate variable plunger pump, hydraulic planger pump |
| CN112906315A (en) * | 2021-02-01 | 2021-06-04 | 北京航空航天大学 | Method and device for constructing performance model of swash plate type axial plunger pump and electronic equipment |
| CN113482873A (en) * | 2021-08-09 | 2021-10-08 | 上海理工大学 | Valve control type variable plunger pump |
-
2021
- 2021-11-17 CN CN202111360574.6A patent/CN114320810A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007104257A1 (en) * | 2006-03-14 | 2007-09-20 | Zhu Raphael | An axial plunger pump or motor |
| CN101240794A (en) * | 2008-03-14 | 2008-08-13 | 贵州大学 | Method and device for reducing axial plunger pump geometric flow pulsation |
| CN101487458A (en) * | 2008-07-14 | 2009-07-22 | 张全根 | Axial variable displacement plunger pump of swash plate |
| CN203452989U (en) * | 2013-08-06 | 2014-02-26 | 吉林大学 | Single-swash-plate staggered phase bidirectional plunger pump |
| CN105587481A (en) * | 2016-03-04 | 2016-05-18 | 沈阳化工大学 | High-speed variable-displacement axial plunger pump |
| CN107084107A (en) * | 2017-06-22 | 2017-08-22 | 杭州力龙液压有限公司 | A kind of electronic sensor control plate variable plunger pump, hydraulic planger pump |
| CN112906315A (en) * | 2021-02-01 | 2021-06-04 | 北京航空航天大学 | Method and device for constructing performance model of swash plate type axial plunger pump and electronic equipment |
| CN113482873A (en) * | 2021-08-09 | 2021-10-08 | 上海理工大学 | Valve control type variable plunger pump |
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