CN113607402A - Device, method and system for testing oil film of plunger pair of plunger pump - Google Patents
Device, method and system for testing oil film of plunger pair of plunger pump Download PDFInfo
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- CN113607402A CN113607402A CN202110930072.6A CN202110930072A CN113607402A CN 113607402 A CN113607402 A CN 113607402A CN 202110930072 A CN202110930072 A CN 202110930072A CN 113607402 A CN113607402 A CN 113607402A
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- plunger
- sensor
- oil film
- sleeve
- area
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/28—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring areas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a device, a method and a system for testing an oil film of a plunger pair of a plunger pump. The device comprises three rotating mechanisms, three sensors and a plunger sleeve; the plunger sleeve is sleeved on the plunger, one end of each sensor is connected with the plunger sleeve, and the other end of each sensor is connected with each rotating mechanism; the rotating mechanism drives the sensor to move radially in the plunger sleeve. The invention can electrically control the position of the sensor, accurately determine the form of the plunger, realize the stable positioning of the sensor installation, calibrate the installation error of the sensor and reduce the measurement error.
Description
Technical Field
The invention relates to the technical field of hydraulic testing, in particular to a device, a method and a system for testing an oil film of a plunger pair of a plunger pump.
Background
The plunger pair, the flow distribution pair and the sliding shoe pair are three important friction pairs in the plunger pump, are key components for realizing the energy transmission function of the plunger pump and improving the energy efficiency of the hydraulic pump, and are weak links for causing the failure of the hydraulic pump. The plunger pair is used as the most critical friction pair, the oil film forming condition is extremely bad, and due to the action of external force, the plunger is in an eccentric state in the cylinder body, and the condition of point contact is easy to occur, so that the development theory and experimental research of the oil film characteristic of the plunger pair are extremely necessary at present, and the oil film test of the plunger cavity of the hydraulic pump is usually measured by using an eddy current displacement sensor. And determining the oil film form in the plunger cavity by measuring the oil film thickness data of four points. The test scheme has obvious defects, for example, the specific form of an oil film cannot be accurately determined due to the fact that the installation accuracy of the eddy current sensor cannot be guaranteed; the oil film shape of one surface is determined by using data of only two points, and the accuracy is not enough.
Disclosure of Invention
In order to overcome the problems, the invention provides a device, a method and a system for testing an oil film of a plunger pair of a plunger pump, which adopt a scheme of positioning one surface by three sensors and can accurately determine the form of a plunger.
In order to achieve the purpose, the invention provides the following scheme:
a plunger pump plunger pair oil film testing device comprises three rotating mechanisms, three sensors and a plunger sleeve; the plunger sleeve is sleeved on the plunger, one end of each sensor is connected with the plunger sleeve, and the other end of each sensor is connected with each rotating mechanism; the rotating mechanism drives the sensor to move radially in the plunger sleeve.
Optionally, the rotating mechanism comprises a conveyor belt, a transmission shaft, a coupling and a low-speed motor; the low-speed motor passes through the shaft coupling with the transmission shaft links to each other, the transmission shaft passes through the conveyer belt drives the sensor is rotatory.
The invention also provides a plunger pump plunger pair oil film testing method, which is applied to the plunger pump plunger pair oil film testing device; the method comprises the following steps:
collecting displacement data of each sensor;
calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles respectively close to the centers of the three auxiliary circles according to the displacement data and the radius of the plunger;
calculating the area of the intersection surface according to the coordinates of the three points;
and controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
Alternatively, the calculation formula of the coordinates of the three points is as follows:
(a1+R-x2)2+b1 2＝R2
(x1-R-a2)2+b2 2＝R2
a2 2+[b2-(R-x3)]2＝R2
(x1-R-a3)2+b3 2＝R2
(R-x2-a3)2+b3 2＝R2
a1 2+b1 2＜R2
a2 2+b2 2＜R2
a3 2+b3 2＜R2
wherein (a)1,b1)、(a2,b2)、(a3,b3) Coordinates of three points, subscripts 1, 2, 3 indicating the number of auxiliary circles, x1，x2，x3Indicating the displacement data of the sensor, the subscripts 1, 2, 3 indicating the serial number of the sensor, and R indicating the radius of the plunger.
Optionally, the calculation formula of the area S of the intersecting surface is as follows:
where x represents the distance from a point at the center of the plunger sleeve in the motor direction of the horizontal axis.
The invention also provides a system for testing the oil film of the plunger pair of the plunger pump, which comprises the following components:
the acquisition module is used for acquiring displacement data of each sensor;
the coordinate calculation module is used for calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles, which are close to the centers of the three auxiliary circles respectively, according to the displacement data and the radius of the plunger;
the area calculation module is used for calculating the area of the intersection surface according to the coordinates of the three points;
and the control module is used for controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
(1) the invention adopts the rotating mechanism, and the position of the sensor can be electrically controlled;
(2) the invention adopts the scheme that three sensors are used for positioning one surface, so that the shape of the plunger can be more accurately determined;
(3) according to the invention, the three sensors are used for measuring data, so that the positioning stability of sensor installation can be realized, and the installation error of the sensors is calibrated, thereby reducing the measurement error.
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 schematic structural diagram of a plunger pair oil film testing device of a plunger pump according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an auxiliary circle according to 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 device, a method and a system for testing an oil film of a plunger pair of a plunger pump, which solve the problem that the specific form of the oil film cannot be accurately determined due to the fact that the installation accuracy of an eddy current sensor cannot be ensured in the prior art; and the problems that the oil film form of one surface is determined only by using data of two points, the accuracy is not enough and the like are solved.
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.
As shown in fig. 1, the oil film testing device for the plunger pair of the plunger pump provided by the invention comprises three rotating mechanisms, three sensors 1 and a plunger sleeve 6; the plunger sleeve 6 is sleeved on the plunger, one end of each sensor 1 is connected with the plunger sleeve 6, and the other end of each sensor 1 is connected with each rotating mechanism respectively; the rotating mechanism drives the sensor 1 to move radially in the plunger sleeve 6.
The rotating mechanism comprises a conveyor belt 2, a transmission shaft 3, a coupler 4 and a low-speed motor 5; the low-speed motor 5 is connected with the transmission shaft 3 through the coupler 4, one end of the transmission shaft 3 is connected with the conveyor belt 2, so that the shaft transmission is changed into a belt transmission mode, the other end of the conveyor belt 2 is connected with the sensor 1,
the low-speed motor 5 is connected with the transmission shaft 3 through the coupler 4, and the transmission shaft 3 is driven by the conveyor belt 2 to rotate the sensor 1.
The invention adopts the rotating mechanism, and the position of the sensor can be electrically controlled; the form of the plunger can be determined more accurately by adopting the scheme of positioning one surface by three sensors; by adopting the three sensors to measure data, the influence of the measurement error of the sensors caused by the measurement of the two sensors can be reduced.
Based on the device, the invention also provides a method for testing the oil film of the plunger pair of the plunger pump, which comprises the following steps:
step 101: and collecting displacement data of each sensor.
Step 102: and calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles respectively close to the centers of the three auxiliary circles according to the displacement data and the radius of the plunger.
Step 103: and calculating the area of the intersection surface according to the coordinates of the three points.
Step 104: and controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
The principle of the method is described in detail below:
as shown in fig. 2, displacement data x measured for three sensors1，x2，x3The positions of the centers of the three auxiliary circles can be determined. If a Cartesian coordinate system is established by taking the central position of the plunger sleeve 6 as the center of a circle and the radius of the plunger is R, the centers of three auxiliary circles for positioning the central plunger position are respectively (x)1-R,0)、(R-x2,0)、(0,R-x3)。
Because the installation position of the sensor cannot be accurately positioned, the situation that three auxiliary circles have only one common intersection point under an ideal state is difficult to realize, an intersection plane is often formed, and the central point of the plunger is located in the intersection plane. Let us mark three points where the intersection surface formed by the intersection of the three auxiliary circles is close to the centers of the three auxiliary circles as (a)1,b1)、(a2,b2)、(a3,b3)。(a1,b1)、(a2,b2)、(a3,b3) Satisfies the following conditions:
and (a)1,b1)、(a2,b2)、(a3,b3) Satisfies the following conditions:
simultaneous formulas (1) and (2), according to the measured x1，x2，x3Obtaining (a)1,b1)、(a2,b2)、(a3,b3) The numerical value of (c). Wherein (a)1,b1)、(a2,b2)、(a3,b3) Coordinates of three points, subscripts 1, 2, 3 indicating the number of auxiliary circles, x1，x2，x3Indicating the displacement data of the sensor, the subscripts 1, 2, 3 indicating the serial number of the sensor, and R indicating the radius of the plunger.
The auxiliary circular cross surface area S satisfies the following condition:
in formula (3) f1(x)、f2(x)、f3(x) The centers of three auxiliary circles are respectively (x)1-R,0)、(R-x2,0)、(0,R-x3) Equation of a curve of (a), and
x represents the distance between the points of the plunger sleeve center in the motor direction of the transverse shaft and the distance of the points of the plunger sleeve center in the simultaneous (3) and (4) formulas to obtain the intersection surface areaDisplacement data x measured by sensor1，x2，x3The motor 5 is used for regulating and controlling the position of the sensor 1 in the plunger sleeve 6 in real time, so that the intersecting surface area S is as small as possible, the central position of the plunger is accurately positioned, and the purpose of reducing errors is achieved.
The invention also provides a system for testing the oil film of the plunger pair of the plunger pump, which comprises the following components:
the acquisition module is used for acquiring displacement data of each sensor;
the coordinate calculation module is used for calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles, which are close to the centers of the three auxiliary circles respectively, according to the displacement data and the radius of the plunger;
the area calculation module is used for calculating the area of the intersection surface according to the coordinates of the three points;
and the control module is used for controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
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 (6)
1. A plunger pump plunger pair oil film testing device is characterized by comprising three rotating mechanisms, three sensors and a plunger sleeve; the plunger sleeve is sleeved on the plunger, one end of each sensor is connected with the plunger sleeve, and the other end of each sensor is connected with each rotating mechanism; the rotating mechanism drives the sensor to move radially in the plunger sleeve.
2. The plunger pair oil film testing device of the plunger pump according to claim 1, wherein the rotating mechanism comprises a conveyor belt, a transmission shaft, a coupler and a low-speed motor; the low-speed motor passes through the shaft coupling with the transmission shaft links to each other, the transmission shaft passes through the conveyer belt drives the sensor is rotatory.
3. A plunger pump plunger pair oil film testing method is characterized in that the method is applied to the plunger pump plunger pair oil film testing device of any one of claims 1-2; the method comprises the following steps:
collecting displacement data of each sensor;
calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles respectively close to the centers of the three auxiliary circles according to the displacement data and the radius of the plunger;
calculating the area of the intersection surface according to the coordinates of the three points;
and controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
4. The method for testing the oil film of the plunger pair of the plunger pump according to claim 3, wherein the calculation formula of the coordinates of three points is as follows:
(a1+R-x2)2+b1 2＝R2
(x1-R-a2)2+b2 2＝R2
a2 2+[b2-(R-x3)]2＝R2
(x1-R-a3)2+b3 2＝R2
(R-x2-a3)2+b3 2＝R2
a1 2+b1 2＜R2
a2 2+b2 2＜R2
a3 2+b3 2＜R2
wherein (a)1，b1)、(a2，b2)、(a3,b3) Coordinates of three points, subscripts 1, 2, 3 indicating the number of auxiliary circles, x1，x2，x3Indicating the displacement data of the sensor, the subscripts 1, 2, 3 indicating the serial number of the sensor, and R indicating the radius of the plunger.
5. The method for testing the oil film of the plunger pair of the plunger pump according to claim 4, wherein the area S of the intersecting surfaces is calculated according to the following formula:
where x represents the distance from a point at the center of the plunger sleeve in the motor direction of the horizontal axis.
6. The utility model provides a plunger pump plunger pair oil film test system which characterized in that includes:
the acquisition module is used for acquiring displacement data of each sensor;
the coordinate calculation module is used for calculating three point coordinates of an intersection surface formed by intersecting the auxiliary circles, which are close to the centers of the three auxiliary circles respectively, according to the displacement data and the radius of the plunger;
the area calculation module is used for calculating the area of the intersection surface according to the coordinates of the three points;
and the control module is used for controlling the position of the sensor in the plunger sleeve according to the area of the intersecting surface.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776575A (en) * | 2022-05-26 | 2022-07-22 | 厦门大学 | Axial plunger pump flow distribution pair oil film thickness indirect measurement method |
| CN115949653A (en) * | 2023-03-08 | 2023-04-11 | 浙江大学 | Friction pair test bed for plunger assembly of inner curve hydraulic motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776575A (en) * | 2022-05-26 | 2022-07-22 | 厦门大学 | Axial plunger pump flow distribution pair oil film thickness indirect measurement method |
| CN114776575B (en) * | 2022-05-26 | 2023-08-18 | 厦门大学 | Indirect measurement method for oil film thickness of flow distribution pair of axial plunger pump |
| CN115949653A (en) * | 2023-03-08 | 2023-04-11 | 浙江大学 | Friction pair test bed for plunger assembly of inner curve hydraulic motor |
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| CN113607402B (en) | 2023-08-25 |
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