CN116046622A - Oil magnetic particle monitoring unit, intelligent maintenance system and control method - Google Patents

Oil magnetic particle monitoring unit, intelligent maintenance system and control method Download PDF

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CN116046622A
CN116046622A CN202310141000.2A CN202310141000A CN116046622A CN 116046622 A CN116046622 A CN 116046622A CN 202310141000 A CN202310141000 A CN 202310141000A CN 116046622 A CN116046622 A CN 116046622A
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oil
magnetic
liquid
monitoring
magnetic particles
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CN116046622B (en
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尹建华
谭新君
石文彬
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Shandong Ipre Detection Technology Co ltd
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Shandong Ipre Detection Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N21/00—Conduits; Junctions; Fittings for lubrication apertures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2888—Lubricating oil characteristics, e.g. deterioration

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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The invention discloses an oil magnetic particle monitoring unit, an intelligent maintenance system and a control method. The oil magnetic particle monitoring unit comprises a non-magnetic oil monitoring flow passage, wherein the oil monitoring flow passage is provided with an oil accelerating area and an oil buffering area, a first flowmeter is arranged at an oil inlet of the oil accelerating area, and a second flowmeter is arranged at an oil outlet of the oil buffering area; the electromagnetic type oil liquid acceleration device is characterized in that an electrically conductive slip ring is arranged at the ring center of the oil liquid acceleration region, a central fixed ring is fixedly connected to a rotor of the electrically conductive slip ring, a rotating arm is arranged on the periphery of the central fixed ring along the radial direction, a magnetic core is arranged at the tail end of the rotating arm, an electromagnetic coil is wound on the magnetic core, and the electromagnetic coil is connected with the electrically conductive slip ring through a wire. The invention can judge the content of the magnetic particles in the oil by measuring the change of the oil flow velocity through the standard flowmeter, does not need high-precision acquisition, has simple circuit design and good stability, is not limited by the oil flow velocity and viscosity, and has wide application range.

Description

Oil magnetic particle monitoring unit, intelligent maintenance system and control method
Technical Field
The invention belongs to the technical field of equipment lubrication, and particularly relates to an oil magnetic particle monitoring unit, an oil monitoring intelligent maintenance system and a control method.
Background
In the equipment lubrication system and the hydraulic system, the oil liquid is better than the blood of a human body, and once the blood has a problem, the human body can be ill or even die. Once contaminated, hydraulic oil is affected not only by the oil itself, which can jeopardize the safe operation of the hydraulic components of the machine and of the whole plant, even causing a production stoppage of the whole production line. Research statistics show that about 70-85% of hydraulic system faults are caused by particle pollutants, and the particle pollutants of oil are the most main sources of hydraulic system failures.
In order to avoid irreversible damage to equipment caused by abnormal abrasion generated by production equipment due to external reasons and the reduction of lubricating performance of equipment oil products, in order to ensure that the actual running condition of the equipment is fed back under the condition of no disassembly, an oil liquid state on-line monitoring device is arranged in an oil way of the equipment in parallel to monitor various parameters in the equipment oil products in real time on line, and an upper computer software carrying oil liquid monitoring is used for realizing remote monitoring and alarming, so that the most effective and truest maintenance basis is provided for equipment and maintenance personnel, the daily maintenance scheme is perfected, and maintenance measures are established according to the actual condition of the equipment running, thereby timely finding and solving the initial problem generated in the daily running of the equipment, effectively avoiding the occurrence of equipment faults and providing favorable guarantee for the stable running of the equipment.
At present, the oil on-line monitoring technology mainly comprises an electrical measurement method, an optical measurement method and a magnetic plug method. The principle of the electrical measurement method is that the difference of dielectric constants when pollutants pass through the monitoring capacitance sensor is utilized, but oil liquid can generate flow pressure change after passing through the filter, so that the dielectric constants of the oil liquid collected by the sensor can be influenced, and the monitoring result is inaccurate. The optical measurement method is used for monitoring solid particles in oil liquid by measuring the change of luminous intensity, but the method is only suitable for the working condition of low flow velocity and can only monitor oil samples with proper viscosity. The magnetic plug method is to install a magnetic plug in an oil system and adsorb particles in the oil onto the magnetic plug. The magnetic plug method is convenient to install and simple in structure, and the fault property of the system can be judged by judging the type, shape, granularity and color of particles by using the magnetic plug method, but the magnetic plug method has the defects that high-precision acquisition of particles in oil liquid is needed, a pcb circuit is needed to be built, the stability is poor, the magnetic plug method can only be used for detecting ferromagnetic metal particles, and the magnetic plug method is ineffective for non-magnetic metal particles.
In addition, the national patent CN202121070929.3 owned by the applicant discloses a lubricating oil monitoring and purifying intelligent maintenance integrated machine which comprises a transition oil tank, an oil discharge pipeline and an oil discharge pump, wherein an oil outlet of the oil discharge pump is connected with a reversing valve, the reversing valve is provided with a first oil outlet and a second oil outlet, the first oil outlet is connected with an adsorption dehydration branch, and an adsorption dehydration filter is arranged on the adsorption dehydration branch; the second oil outlet is connected with an oil discharge working branch, and the adsorption dehydration branch is connected with the oil discharge working branch in parallel and then connected to a lubricating oil tank through an oil supply pipeline; the bottom of the lubricating oil tank is connected with the transition oil tank through an oil return pipeline, a moisture content sensor, a dielectric constant sensor and a centrifugal rotor filter are arranged on the oil return pipeline, and the device can monitor pollution of lubricating oil of the device in real time and timely adopt bypass purification treatment according to requirements. But this device has the following drawbacks: the power and efficiency of the oil pump cannot be adjusted and controlled in real time according to the content change of metal particles in the oil, the expected control effect is not ideal, and further improvement is necessary.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide the oil magnetic particle monitoring unit which has wide application range, is not limited by the oil flow rate and viscosity, and can obtain the amount of pollutants in oil without high-precision acquisition.
In order to solve the technical problems, the technical scheme of the invention is as follows: the oil magnetic particle monitoring unit comprises a non-magnetic oil monitoring flow passage, wherein the oil monitoring flow passage is provided with an oil accelerating area and an oil buffering area, a first flowmeter is arranged at an oil inlet of the oil accelerating area, and a second flowmeter is arranged at an oil outlet of the oil buffering area;
the oil accelerating area is annular, an electrically conductive slip ring is arranged at the annular center of the oil accelerating area, a central fixing ring is fixedly connected to a rotor of the electrically conductive slip ring, a rotating arm is radially arranged on the periphery of the central fixing ring, a magnetic core closely attached to the pipe wall of the oil accelerating area is arranged at the tail end of the rotating arm, an electromagnetic coil is wound on the magnetic core, and the electromagnetic coil is connected with the electrically conductive slip ring through a wire.
As an optimal technical scheme, the oil liquid monitoring flow passage is a rubber hose or a plastic hose.
As the preferable technical scheme, the number of the rotating arms is 6-10, and the rotating arms are uniformly distributed along the circumference of the central fixing ring.
The second technical problem to be solved by the invention is to provide an oil monitoring intelligent maintenance system which can monitor lubricating oil on line and adjust and control the rotation speed of an oil pump in real time according to the content change of magnetic particles in the oil.
In order to solve the technical problems, the technical scheme of the invention is as follows: the oil monitoring intelligent maintenance system comprises an oil pump and an oil conveying pipeline; the centrifugal filter is arranged on the oil conveying pipeline and positioned at the downstream of the oil pump, the oil magnetic particle monitoring unit is arranged on the oil conveying pipeline and positioned at the downstream of the centrifugal filter, the signal output end of the oil magnetic particle monitoring unit is connected with the controller, and the controller is in control connection with the oil pump.
As an optimal technical scheme, the oil liquid conveying pipeline is provided with a dielectric constant sensor, and a signal output end of the dielectric constant sensor is also connected with the controller.
The invention also provides an intelligent maintenance control method for oil monitoring, which comprises the following steps:
s1, a nonmagnetic oil liquid monitoring flow passage is arranged in an oil liquid conveying pipeline, the oil liquid monitoring flow passage is provided with an oil liquid accelerating area and an oil liquid buffer area, and the oil liquid accelerating area is annularly arranged; a first flowmeter is arranged at an oil inlet of the oil accelerating region, and a first oil flow rate is obtained through the first flowmeter
Figure SMS_1
；
S2, a conductive slip ring is arranged at the ring center of the oil accelerating area, a rotor of the conductive slip ring is fixedly connected with a central fixing ring, a rotating arm is arranged on the periphery of the central fixing ring along the radial direction, a magnetic core closely attached to the pipe wall of the oil accelerating area is arranged at the tail end of the rotating arm, an electromagnetic coil is wound on the magnetic core, and the electromagnetic coil is connected with the conductive slip ring through a wire; after the oil containing magnetic particles flows into the oil accelerating area, the magnetic particles in the oil are accelerated by the magnetic field generated by the rotating electromagnetic coil, and the magnetic particles are accelerated until the magnetic particles reach the rotation linear speed of the electromagnetic coil
Figure SMS_2
The same, under the action of the accelerated magnetic particles, the flow velocity of the liquid in the oil liquid can be correspondingly improved;
s3, a second flowmeter is arranged at an oil outlet of the oil buffer zone, the magnetic field effect disappears after the accelerated oil containing magnetic particles flows into the oil buffer zone, and when the flow velocity of the liquid in the oil and the flow velocity of the magnetic particles tend to be balanced, the second flowmeter is used for obtaining the second flow velocity of the oil
Figure SMS_3
；
S4, according to the first flow rate
Figure SMS_4
And a second flow rate->
Figure SMS_5
Obtaining the content of magnetic particles in the oil liquid through an algorithm;
and S5, an oil pump and a centrifugal filter are arranged on the oil conveying pipeline, and the controller adjusts the rotating speed of the oil pump according to the measured value of magnetic particles in the oil, so that the oil pressure of an oil way and the inlet oil of the centrifugal filter are controlled, the optimal configuration of power and efficiency is achieved, and meanwhile, the monitoring of the oil is realized.
In step S4, the algorithm is as follows:
setting the total mass of the oil liquid containing the magnetic particles passing through the oil liquid monitoring flow channel in unit time as follows
Figure SMS_6
The mass of the magnetic particles is->
Figure SMS_7
Then: />
The liquid kinetic energy at the oil inlet of the oil accelerating region is
Figure SMS_8
，
The liquid kinetic energy at the oil outlet of the oil buffer zone is
Figure SMS_9
，
The kinetic energy of the magnetic particles in the oil accelerating region is that
Figure SMS_10
（ />
Figure SMS_11
-/>
Figure SMS_12
），
According to the law of conservation of energy, then:
Figure SMS_13
= />
Figure SMS_14
+/>
Figure SMS_15
（ />
Figure SMS_16
- />
Figure SMS_17
）。
due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) The non-magnetic oil liquid monitoring flow passage is arranged in the oil liquid conveying pipeline, and is provided with an oil liquid accelerating area and an oil liquid buffer area, wherein the oil liquid accelerating area is annularly arranged; the rotary arm is arranged at the periphery of the central fixed ring along the radial direction, a magnetic core closely attached to the pipe wall of the oil accelerating area is arranged at the tail end of the rotary arm, an electromagnetic coil is wound on the magnetic core, and the electromagnetic coil is connected with the conductive slip ring through a wire; a first flowmeter is arranged at an oil inlet of the oil accelerating region, and a first oil flow rate is obtained through the first flowmeter
Figure SMS_18
A second flowmeter is arranged at the oil outlet of the oil buffer zone, and the second flow rate of the oil is obtained through the second flowmeter>
Figure SMS_19
Therefore, the content of magnetic particles in the oil can be judged by measuring the change of the oil flow velocity through the standard flowmeter, high-precision acquisition is not needed, the circuit design is simple, a pcb circuit is not required to be built, the stability is good, the limitation of the oil flow velocity and the viscosity is avoided, and the application range is wide.
(2) The contaminated oil is pressurized by the oil pump and enters the centrifugal filter to remove impurities, wherein the rotor speed of the centrifugal filter is higher when the oil pressure is higher. The oil liquid from the centrifugal filter passes through the dielectric constant sensor to obtain the content of all conductive media in the oil liquid, and then passes through the oil liquid magnetic particle monitoring unit to obtain the content of magnetic particles. The whole process is connected with the controller through 485 communication protocol, and the controller adjusts the rotation speed of the oil pump according to the measured value so as to control the oil pressure of the oil way and the inlet oil of the centrifugal filter, thereby achieving the optimal configuration of the power and efficiency of the centrifugal oil purifier, and simultaneously realizing the monitoring of the oil, thereby achieving the expected control effect.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic diagram showing a front view of an oil-liquid magnetic particle monitoring unit according to an embodiment of the present invention;
FIG. 2 is a schematic top view of an oil-liquid magnetic particle monitoring unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a system for intelligent maintenance of oil monitoring in an embodiment of the present invention;
fig. 4 is a control schematic diagram of an intelligent maintenance system for monitoring oil liquid in an embodiment of the invention.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
As shown in fig. 1 and 2, the oil magnetic particle monitoring unit comprises a non-magnetic oil monitoring flow channel 1, wherein the oil monitoring flow channel 1 can adopt a rubber hose or a plastic hose, and the diameter of the oil monitoring flow channel can be expanded or contracted; the oil monitoring flow channel 1 is provided with an oil accelerating area 11 and an oil buffering area 12, a first flowmeter 2 is arranged at an oil inlet of the oil accelerating area 11, and a second flowmeter 3 is arranged at an oil outlet of the oil buffering area 12;
the oil accelerating area 11 is in an annular arrangement, the conductive slip ring 4 is installed at the annular center of the oil accelerating area 11, the central fixing ring 5 is fixedly connected to the rotor of the conductive slip ring 4, the rotating arm 6 is arranged on the periphery of the central fixing ring 5 along the radial direction, the magnetic core 7 tightly attached to the pipe wall of the oil accelerating area 11 is installed at the tail end of the rotating arm 6, and the magnetic core 7 can synchronously rotate along with the rotating arm 6. The magnetic core 7 is last to be wound and to be equipped with solenoid 8, solenoid 8 passes through the wire and is connected with electrically conductive sliding ring 4, and electrically conductive sliding ring 4 is connected with driving motor 9, in this embodiment, swinging boom 6 and solenoid 8 are provided with 8 groups, and follow the circumference equipartition of center solid fixed ring 5.
The working principle of the oil magnetic particle monitoring unit is as follows: the driving motor 9 drives the conductive slip ring 4 to rotate, when the conductive slip ring 4 rotates, the central fixing ring 5 is driven to rotate, the central fixing ring 5 drives the rotating arm 6 to rotate, the electromagnetic coil 8 synchronously rotates along with the rotating arm, and the electromagnetic coil 8 is continuously supplied with power through a lead. After the oil containing magnetic particles flows into the oil accelerating area 11, when the 8 groups of electromagnetic coils rotate and the rotating speed is larger than the oil flow speed, the magnetic particles in the oil are accelerated by utilizing the magnetic field generated by the rotating electromagnetic coils 8, and finally the magnetic particles in the oil are the same as the rotating linear speed of the electromagnetic coils 8. Because the oil is generally viscous, the resistance to the magnetic particles is obvious, and the flow velocity of the liquid in the oil can be correspondingly improved under the action of the accelerated magnetic particles. After the accelerated oil containing magnetic particles flows into the oil buffer zone 12, the magnetic field effect disappears, and the liquid flow rate inside the oil and the magnetic particle flow rate tend to be balanced. The first velocity of flow of fluid of entrance is obtained through first flowmeter 2 like this, obtains the fluid second velocity of flow of exit through second flowmeter 3, measures the content that the fluid velocity of flow changes can judge the interior magnetic particle of fluid through standard flowmeter, does not need the collection of high accuracy, and circuit design is simple, need not build pcb circuit by oneself, and stability is good, does not receive fluid velocity of flow and viscosity restriction, and application scope is wide.
Referring to fig. 3 and 4, the oil monitoring intelligent maintenance system comprises an oil pump 10 and an oil conveying pipeline 13; the centrifugal filter 14 and the dielectric constant sensor 15 are installed on the oil conveying pipeline 13 and located at the downstream of the oil pump 10, the oil magnetic particle monitoring unit is arranged on the oil conveying pipeline 13 and located at the downstream of the centrifugal filter 14, signal output ends of the first flowmeter 2, the second flowmeter 3 and the dielectric constant sensor 15 in the oil magnetic particle monitoring unit are respectively connected with the controller 16, and the controller 16 is in control connection with the oil pump 10. The system can adjust and control the rotation speed of the oil pump in real time according to the content change of magnetic particles in the oil, so that the optimal configuration of the power and efficiency of the centrifugal oil purifier is achieved, and meanwhile, the on-line monitoring of the oil is realized.
The control method of the oil monitoring intelligent maintenance system comprises the following steps:
s1, enabling contaminated oil to enter a centrifugal filter to remove impurities through pressurization of an oil pump, wherein the higher the oil pressure is, the faster the rotating speed of a rotor of the centrifugal filter is; the oil from the centrifugal filter passes through the dielectric constant sensor to obtain the content of all conductive media in the oil, and then enters the magnetic particle monitoring unit to obtain the first flow rate of the oil through the first flowmeter 2
Figure SMS_20
；
S2, after the oil containing the magnetic particles flows into the oil accelerating region 11, the magnetic particles in the oil are accelerated by the magnetic field generated by the rotating electromagnetic coil 8 until the magnetic particles are accelerated to the rotation linear velocity of the electromagnetic coil 8
Figure SMS_21
The same, under the action of the accelerated magnetic particles, the flow velocity of the liquid in the oil liquid can be correspondingly improved; the rotational linear speed of the electromagnetic coil 8>
Figure SMS_22
Can be easily obtained from the rotation speed and the rotation radius;
s3, a second flowmeter 3 is arranged at the oil outlet of the oil buffer zone 12, after the accelerated oil containing magnetic particles flows into the oil buffer zone 12, the magnetic field effect disappears, the flow velocity of the liquid in the oil and the flow velocity of the magnetic particles tend to be balanced, and at the moment, the second flow velocity of the oil is obtained through the second flowmeter 3
Figure SMS_23
；
S4, according to the first streamQuick speed
Figure SMS_24
And a second flow rate->
Figure SMS_25
Obtaining the content of magnetic particles in the oil liquid through an algorithm;
and S5, the controller 16 adjusts the rotating speed of the oil pump 10 according to the measured values of the dielectric constant sensor and the magnetic particle monitoring unit, so that the oil pressure of an oil way and the inlet oil of the centrifugal filter are controlled, the optimal configuration of power and efficiency is achieved, and meanwhile, the monitoring of the oil is realized.
In step S4, the algorithm is as follows:
setting the total mass of the oil liquid containing the magnetic particles passing through the oil liquid monitoring flow channel in unit time as follows
Figure SMS_26
The mass of the magnetic particles is->
Figure SMS_27
Then:
the liquid kinetic energy at the oil inlet of the oil accelerating region is
Figure SMS_28
，
The liquid kinetic energy at the oil outlet of the oil buffer zone is
Figure SMS_29
，
The kinetic energy of the magnetic particles in the oil accelerating region is that
Figure SMS_30
（ />
Figure SMS_31
-/>
Figure SMS_32
），
According to the law of conservation of energy, then:
Figure SMS_33
= />
Figure SMS_34
+/>
Figure SMS_35
（/>
Figure SMS_36
-/>
Figure SMS_37
）。
the mass of the magnetic particles can be obtained by the formula
Figure SMS_38
And the content thereof.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.

Claims (7)

1. Fluid magnetic particle monitoring unit, its characterized in that: the device comprises a non-magnetic oil monitoring flow passage, wherein the oil monitoring flow passage is provided with an oil accelerating area and an oil buffering area, a first flowmeter is arranged at an oil inlet of the oil accelerating area, and a second flowmeter is arranged at an oil outlet of the oil buffering area;
the oil accelerating area is annular, an electrically conductive slip ring is arranged at the annular center of the oil accelerating area, a central fixing ring is fixedly connected to a rotor of the electrically conductive slip ring, a rotating arm is radially arranged on the periphery of the central fixing ring, a magnetic core closely attached to the pipe wall of the oil accelerating area is arranged at the tail end of the rotating arm, an electromagnetic coil is wound on the magnetic core, and the electromagnetic coil is connected with the electrically conductive slip ring through a wire.
2. The oil magnetic particle monitoring unit of claim 1, wherein: the oil liquid monitoring flow passage is a rubber hose or a plastic hose.
3. The oil magnetic particle monitoring unit of claim 1, wherein: the number of the rotating arms is 6-10, and the rotating arms are uniformly distributed along the circumference of the central fixing ring.
4. The oil monitoring intelligent maintenance system comprises an oil pump and an oil conveying pipeline; the method is characterized in that: the centrifugal filter is arranged on the oil conveying pipeline and positioned at the downstream of the oil pump, the oil magnetic particle monitoring unit according to claim 1 is arranged on the oil conveying pipeline and positioned at the downstream of the centrifugal filter, and the signal output end of the oil magnetic particle monitoring unit is connected with the controller which is in control connection with the oil pump.
5. The oil monitoring intelligent maintenance system of claim 4, wherein: the oil liquid conveying pipeline is provided with a dielectric constant sensor, and the signal output end of the dielectric constant sensor is also connected with the controller.
6. The intelligent maintenance control method for oil monitoring is characterized by comprising the following steps:
s1, a nonmagnetic oil liquid monitoring flow passage is arranged in an oil liquid conveying pipeline, the oil liquid monitoring flow passage is provided with an oil liquid accelerating area and an oil liquid buffer area, and the oil liquid accelerating area is annularly arranged; a first flowmeter is arranged at an oil inlet of the oil accelerating region, and a first oil flow rate is obtained through the first flowmeter
Figure QLYQS_1
；
S2, a conductive slip ring is arranged at the ring center of the oil accelerating area, a rotor of the conductive slip ring is fixedly connected with a central fixing ring, the periphery of the central fixing ring is radially provided with a rotating arm, the tail end of the rotating arm is provided with a magnetic core closely attached to the pipe wall of the oil accelerating area, an electromagnetic coil is wound on the magnetic core, and the magnetic core is provided with a magnetic coreThe electromagnetic coil is connected with the conductive slip ring through a wire; after the oil containing magnetic particles flows into the oil accelerating area, the magnetic particles in the oil are accelerated by the magnetic field generated by the rotating electromagnetic coil, and the magnetic particles are accelerated until the magnetic particles reach the rotation linear speed of the electromagnetic coil
Figure QLYQS_2
The same, under the action of the accelerated magnetic particles, the flow velocity of the liquid in the oil liquid can be correspondingly improved;
s3, a second flowmeter is arranged at an oil outlet of the oil buffer zone, the magnetic field effect disappears after the accelerated oil containing magnetic particles flows into the oil buffer zone, and when the flow velocity of the liquid in the oil and the flow velocity of the magnetic particles tend to be balanced, the second flowmeter is used for obtaining the second flow velocity of the oil
Figure QLYQS_3
；
S4, according to the first flow rate
Figure QLYQS_4
And a second flow rate->
Figure QLYQS_5
Obtaining the content of magnetic particles in the oil liquid through an algorithm;
and S5, an oil pump and a centrifugal filter are arranged on the oil conveying pipeline, and the controller adjusts the rotating speed of the oil pump according to the measured value of magnetic particles in the oil, so that the oil pressure of an oil way and the inlet oil of the centrifugal filter are controlled, the optimal configuration of power and efficiency is achieved, and meanwhile, the monitoring of the oil is realized.
7. The intelligent maintenance control method for oil monitoring as claimed in claim 6, wherein: in step S4, the algorithm is as follows:
setting the total mass of the oil liquid containing the magnetic particles passing through the oil liquid monitoring flow channel in unit time as follows
Figure QLYQS_6
Magnetic particlesThe grain quality is->
Figure QLYQS_7
Then:
the liquid kinetic energy at the oil inlet of the oil accelerating region is
Figure QLYQS_8
，
The liquid kinetic energy at the oil outlet of the oil buffer zone is
Figure QLYQS_9
，
The kinetic energy of the magnetic particles in the oil accelerating region is that
Figure QLYQS_10
（/>
Figure QLYQS_11
-/>
Figure QLYQS_12
）；
According to the law of conservation of energy, then:
Figure QLYQS_13
=/>
Figure QLYQS_14
+/>
Figure QLYQS_15
（/>
Figure QLYQS_16
-/>
Figure QLYQS_17
）。/>
CN202310141000.2A 2023-02-21 2023-02-21 Oil magnetic particle monitoring unit, intelligent maintenance system and control method Active CN116046622B (en)

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