CN113607402B - Plunger pump plunger pair oil film testing device, method and system - Google Patents
Plunger pump plunger pair oil film testing device, method and system Download PDFInfo
- Publication number
- CN113607402B CN113607402B CN202110930072.6A CN202110930072A CN113607402B CN 113607402 B CN113607402 B CN 113607402B CN 202110930072 A CN202110930072 A CN 202110930072A CN 113607402 B CN113607402 B CN 113607402B
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- Prior art keywords
- plunger
- eddy current
- displacement sensor
- current displacement
- oil film
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Classifications
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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
-
- 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
-
- 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 a plunger auxiliary oil film 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 respectively; 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 and calibrate the error of the sensor installation, thereby reducing 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 a plunger auxiliary oil film 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, the plunger is in an eccentric state in the cylinder body due to the action of external force, and the condition of point contact is easy to occur, so that the development theory and experimental research of the oil film characteristics of the plunger pair are extremely necessary, and the oil film test of the plunger cavity of the hydraulic pump is usually measured by using an eddy current displacement sensor. The oil film morphology in the plunger cavity was determined by measuring oil film thickness data at four points. The test scheme has obvious defects, for example, the specific form of an oil film cannot be accurately determined because the installation precision of the eddy current sensor cannot be ensured; the oil film morphology of one surface is determined using only the data of two points, the accuracy is not enough, and the like.
Disclosure of Invention
In order to overcome the problems, the invention provides a device, a method and a system for testing an auxiliary oil film of a plunger pump plunger, which adopt a scheme of positioning one surface by three sensors and can accurately determine the shape of the plunger.
In order to achieve the above object, the present invention provides the following solutions:
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 respectively; 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 is connected with the transmission shaft through the coupler, and the transmission shaft drives the sensor to rotate through the conveyor belt.
The invention also provides a plunger pump plunger auxiliary oil film testing method, which is applied to the plunger pump plunger auxiliary oil film testing device; the method comprises the following steps:
collecting displacement data of each sensor;
calculating three point coordinates of an intersecting surface formed by intersecting the auxiliary circles according to the displacement data and the plunger radius, wherein the three point coordinates are respectively close to the circle centers of the three auxiliary circles;
calculating the area of the intersection according to the three point coordinates;
the position of the sensor in the plunger sleeve is controlled according to the area of the intersection.
Alternatively, the calculation formula of the three point coordinates is as follows:
(a 1 +R-x 2 ) 2 +b 1 2 ＝R 2
(x 1 -R-a 2 ) 2 +b 2 2 ＝R 2
a 2 2 +[b 2 -(R-x 3 )] 2 ＝R 2
(x 1 -R-a 3 ) 2 +b 3 2 ＝R 2
(R-x 2 -a 3 ) 2 +b 3 2 ＝R 2
a 1 2 +b 1 2 ＜R 2
a 2 2 +b 2 2 ＜R 2
a 3 2 +b 3 2 ＜R 2
wherein (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The coordinates of three points are represented, subscripts 1, 2, 3 represent the serial numbers of the auxiliary circles, x 1 ，x 2 ，x 3 The displacement data of the sensor are represented, subscripts 1, 2, 3 represent the serial numbers of the sensors, and R represents the radius of the plunger.
Alternatively, the area S of intersection is calculated as follows:
where x represents the distance from the point in the transverse axis motor direction at the center of the plunger sleeve.
The invention also provides a plunger pump plunger pair oil film testing system, which comprises:
the acquisition module is used for acquiring displacement data of each sensor;
the coordinate calculation module is used for calculating three point coordinates, which are respectively close to the circle centers of the three auxiliary circles, of an intersecting surface formed by intersecting the auxiliary circles according to the displacement data and the plunger radius;
the area calculation module is used for calculating the area of the intersection according to the three point coordinates;
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, so that the position of the sensor can be electrically controlled;
(2) The invention adopts a scheme of positioning one surface by three sensors, so that the form of the plunger can be accurately determined;
(3) The invention adopts three sensors to measure data, can realize the stable positioning of the sensor installation, and calibrate the error of the sensor installation, thereby reducing the measurement error.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a plunger pump plunger pair oil film testing device 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 following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a device, a method and a system for testing a plunger pair oil film of a plunger pump, which solve the problem that the installation precision of an eddy current sensor cannot be ensured in the prior art, so that the specific form of an oil film cannot be accurately determined; and the problems of insufficient accuracy and the like of determining the oil film form of one surface by using data of only two points are solved.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the plunger pump plunger pair oil film testing device 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 respectively connected with each rotating mechanism; 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 coupling 4, one end of the transmission shaft 3 is connected with the transmission belt 2, thereby realizing the purpose of transmitting the shaft into a belt transmission mode, the other end of the transmission 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 drives the sensor 1 to rotate through the conveyor belt 2.
The invention adopts the rotating mechanism, so that the position of the sensor can be electrically controlled; the three sensors are adopted to position one surface, so that the form of the plunger can be accurately determined; by adopting the three-sensor measurement data, the influence of measurement errors of the sensors caused by measurement of two sensors can be reduced.
Based on the device, the invention also provides a method for testing the auxiliary oil film of the plunger pump plunger, which comprises the following steps:
step 101: and acquiring displacement data of each sensor.
Step 102: and calculating three point coordinates of an intersecting surface formed by intersecting the auxiliary circles and respectively approaching the circle centers of the three auxiliary circles according to the displacement data and the plunger radius.
Step 103: the area of intersection is calculated from the three point coordinates.
Step 104: the position of the sensor in the plunger sleeve is controlled according to the area of the intersection.
The principle of the method is described in detail below:
as shown in fig. 2, displacement data x measured for three sensors 1 ，x 2 ，x 3 The center positions of the three auxiliary circles can be determined. If a Cartesian coordinate system is established with the center position of the plunger sleeve 6 as the center of the circle, and the radius of the plunger is R, the center of the three auxiliary circles for positioning the center plunger is (x 1 -R,0)、(R-x 2 ,0)、(0,R-x 3 )。
Because the installation position of the sensor cannot be accurately positioned, the situation that three auxiliary circles have only one common intersection point in an ideal state is difficult to realize, an intersection surface is often formed, and the center point of the plunger is located in the intersection surface. The three points of intersection surface formed by intersecting the three auxiliary circles are respectively close to the centers of the three auxiliary circles and marked as (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 )。(a 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The method meets the following conditions:
and (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The method meets the following conditions:
simultaneous (1), (2) formulas, based on the measured x 1 ，x 2 ，x 3 Can obtain (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) Is a numerical value of (2). Wherein (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The coordinates of three points are represented, subscripts 1, 2, 3 represent the serial numbers of the auxiliary circles, x 1 ，x 2 ，x 3 The displacement data of the sensor are represented, subscripts 1, 2, 3 represent the serial numbers of the sensors, and R represents the radius of the plunger.
The auxiliary circular intersection area S satisfies the following conditions:
f in (3) 1 (x)、f 2 (x)、f 3 (x) The centers of the three auxiliary circles are (x) 1 -R,0)、(R-x 2 ,0)、(0,R-x 3 ) And (2) curve equation of
x represents the intersection area obtained by combining the distances (3) and (4) of points from the center of the plunger sleeve in the transverse axis motor direction, and the displacement data x is measured according to the displacement sensor 1 ，x 2 ，x 3 The 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 area S is as small as possible, and therefore the central position of the plunger is accurately positioned, and the purpose of reducing errors is achieved.
The invention also provides a plunger pump plunger pair oil film testing system, which comprises:
the acquisition module is used for acquiring displacement data of each sensor;
the coordinate calculation module is used for calculating three point coordinates, which are respectively close to the circle centers of the three auxiliary circles, of an intersecting surface formed by intersecting the auxiliary circles according to the displacement data and the plunger radius;
the area calculation module is used for calculating the area of the intersection according to the three point coordinates;
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.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (3)
1. The method is characterized by being applied to a plunger pump plunger auxiliary oil film testing device; the plunger pump plunger pair oil film testing device comprises three rotating mechanisms, three eddy current displacement sensors and a plunger sleeve; the plunger sleeve is sleeved on the plunger, one end of each eddy current displacement sensor is connected with the plunger sleeve, and the other end of each eddy current displacement sensor is connected with each rotating mechanism respectively; the rotating mechanism drives the eddy current displacement sensor to move radially in the plunger sleeve;
the method comprises the following steps:
collecting displacement data of each eddy current displacement sensor;
calculating three point coordinates of an intersecting surface formed by intersecting the auxiliary circles according to the displacement data and the plunger radius, wherein the three point coordinates are respectively close to the circle centers of the three auxiliary circles;
calculating the area of the intersection according to the three point coordinates;
controlling the position of the eddy current displacement sensor in the plunger sleeve according to the area of the intersecting surface;
the calculation formula of the three point coordinates is as follows:
a 1 2 +[b 1 -(R-x 3 )] 2 ＝R 2
a 2 2 +[b 2 -(R-x 3 )] 2 ＝R 2
a 1 2 +b 1 2 ＜R 2
a 2 2 +b 2 2 ＜R 2
a 3 2 +b 3 2 ＜R 2
wherein (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The coordinates of three points are represented, subscripts 1, 2, 3 represent the serial numbers of the auxiliary circles, x 1 ，x 2 ，x 3 The displacement data of the eddy current displacement sensor are represented, subscripts 1, 2 and 3 represent the serial numbers of the eddy current displacement sensor, and R represents the radius of the plunger;
the area S of intersection is calculated as follows:
where x represents the distance from the point in the transverse axis motor direction at the center of the plunger sleeve.
2. The method for testing the oil film of the plunger pair 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 is connected with the transmission shaft through the coupler, and the transmission shaft drives the eddy current displacement sensor to rotate through the transmission belt.
3. A plunger pump plunger pair oil film testing system, characterized in that the system is applied to the plunger pump plunger pair oil film testing method according to any one of claims 1-2, the system comprising:
the acquisition module is used for acquiring displacement data of each eddy current displacement sensor;
the coordinate calculation module is used for calculating three point coordinates, which are respectively close to the circle centers of the three auxiliary circles, of an intersecting surface formed by intersecting the auxiliary circles according to the displacement data and the plunger radius;
the area calculation module is used for calculating the area of the intersection according to the three point coordinates;
the control module is used for controlling the position of the eddy current displacement sensor in the plunger sleeve according to the area of the intersecting surface;
the calculation formula of the three point coordinates is as follows:
a 1 2 +[b 1 -(R-x 3 )] 2 ＝R 2
a 2 2 +[b 2 -(R-x 3 )] 2 ＝R 2
a 1 2 +b 1 2 ＜R 2
a 2 2 +b 2 2 ＜R 2
a 3 2 +b 3 2 ＜R 2
wherein (a) 1 ,b 1 )、(a 2 ,b 2 )、(a 3 ,b 3 ) The coordinates of three points are represented, subscripts 1, 2, 3 represent the serial numbers of the auxiliary circles, x 1 ，x 2 ，x 3 The displacement data of the eddy current displacement sensor are represented, subscripts 1, 2 and 3 represent the serial numbers of the eddy current displacement sensor, and R represents the radius of the plunger;
the area S of intersection is calculated as follows:
where x represents the distance from the point in the transverse axis motor direction at the center of the plunger sleeve.
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| CN202110930072.6A CN113607402B (en) | 2021-08-13 | 2021-08-13 | Plunger pump plunger pair oil film testing device, method and system |
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| CN202110930072.6A CN113607402B (en) | 2021-08-13 | 2021-08-13 | Plunger pump plunger pair oil film testing device, method and system |
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| CN113607402B true CN113607402B (en) | 2023-08-25 |
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| 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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