CN115591310B - System and method for filtering ferromagnetic particles in gradient magnetic field electric oil - Google Patents
System and method for filtering ferromagnetic particles in gradient magnetic field electric oil Download PDFInfo
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- CN115591310B CN115591310B CN202211591161.3A CN202211591161A CN115591310B CN 115591310 B CN115591310 B CN 115591310B CN 202211591161 A CN202211591161 A CN 202211591161A CN 115591310 B CN115591310 B CN 115591310B
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 118
- 238000001914 filtration Methods 0.000 title claims abstract description 116
- 239000002245 particle Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 23
- 239000013618 particulate matter Substances 0.000 claims abstract description 65
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 210000002268 wool Anatomy 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 abstract description 27
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 37
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/06—Filters making use of electricity or magnetism
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
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Abstract
The invention belongs to the technical field of separation of particles in liquid, and discloses a system and a method for filtering ferromagnetic particles in electric oil with a gradient magnetic field, wherein the system comprises a precise filter element, a controller, a front-end particle pollution degree sensor, a gradient magnetic field filter, a rear-end particle pollution degree sensor, a front-end electric valve and a rear-end electric valve which are arranged on an oil way, one path of an outlet of the front-end electric valve is connected with one inlet of the rear-end electric valve, and the other path of the outlet of the front-end electric valve is connected with the other inlet of the rear-end electric valve through the precise filter element; the front-end particle pollution degree sensor, the gradient magnetic field filter, the rear-end particle pollution degree sensor, the front-end electric valve and the rear-end electric valve are connected with the controller. The invention can realize the automatic flushing function of the magnetic medium accumulation without stopping the machine or flushing the parts such as a pump and the like by adjusting the connection of the outlet of the front end electric valve and the rear end electric valve or the connection of the outlet of the front end electric valve and the rear end electric valve through a precise filter element without arranging a special back flushing pipeline and parts.
Description
Technical Field
The invention belongs to the technical field of separation of particles in liquid, and relates to a system and a method for filtering ferromagnetic particles in electric oil with a gradient magnetic field.
Background
The electric oil plays roles of lubrication, heat dissipation and the like in the operation process of the electric equipment and is vital to the normal work of the electric equipment. The electric equipment inevitably generates friction wear after long-term operation, the wear particles are more ferromagnetic or weakly magnetic particles, and the long-term existence of the magnetic particles in the lubricating oil can accelerate the equipment wear and the oil product aging, thereby causing the safety influence to the equipment which is not ignored.
Normally, the filter element used for the electric oil can filter out particles in oil, but because the particles in the oil are small, the required filter element has higher filtering precision, and therefore, the required operation flow and pressure cannot be too high in the use process, which causes lower filtering efficiency; meanwhile, the oil consumption of the power equipment is usually large, once the particles exceed the standard, the number of used filter elements is large, and the filter elements with high filtering precision are expensive.
The magnetic separator can well remove ferromagnetic particles in water or powder, but along with the continuous operation of the magnetic separator, the more the particles adsorbed by the magnetic gathering medium are, the filtering efficiency of the magnetic separator is rapidly reduced. Thus. The magnetic separator needs to regularly and frequently wash particles on the magnetic gathering medium in the using process so as to achieve higher filtering efficiency. Generally, the flushing is completed through a set of special back flushing pipeline, a flushing pump and other components, the normal operation of the system is stopped in the flushing process, and the system operates again after the flushing is completed. The back-flushing pipeline at least comprises a flushing inlet valve, an outlet valve and a back-flushing medium, and the pipeline is complicated.
Electrical equipment, in particular power generation equipment, usually operates throughout the year after commissioning and cannot be shut down; meanwhile, when the oil for electric power is filtered, the number of filter elements using 1um or even higher filtering precision is large, and the cost is high.
Disclosure of Invention
In order to solve the problems of high filter element precision, high cost and complex pipeline in the prior art, the invention aims to provide the system and the method for filtering ferromagnetic particles in the electric oil with the gradient magnetic field, which have simple structures and do not need back flushing of the pipeline.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a ferromagnetic particulate matter filtering system in gradient magnetic field electric power oil comprises a precise filter element, a controller, a front end particle pollution degree sensor, a gradient magnetic field filter, a rear end particle pollution degree sensor, a front end electric valve and a rear end electric valve, wherein the front end particle pollution degree sensor, the gradient magnetic field filter, the rear end particle pollution degree sensor, the front end electric valve and the rear end electric valve are arranged on an oil circuit; the front-end particle pollution degree sensor, the gradient magnetic field filter, the rear-end particle pollution degree sensor, the front-end electric valve and the rear-end electric valve are connected with the controller.
Furthermore, the device also comprises a contactor connected with the gradient magnetic field filter, and the contactor is connected with the controller.
Furthermore, the precise filter element is arranged in a precise filter container, and a differential pressure sensor is arranged on the precise filter container and is connected with the controller.
Further, the controller is a PLC controller or an industrial personal computer.
Furthermore, the gradient magnetic field filter adopts an electromagnetic magnetic separator which takes a magnetic gathering medium as magnetic steel wool.
Furthermore, the front end electric valve and the rear end electric valve adopt two-position three-way type electric valves.
Furthermore, the filtering precision of the precise filter element is 5 to 20um.
The method for filtering the ferromagnetic particles in the electric oil of the system for filtering the ferromagnetic particles in the electric oil based on the gradient magnetic field comprises the following steps of:
1) Setting a pressure difference threshold value; starting the gradient magnetic field filter, establishing a gradient magnetic field, and connecting the front end electric valve with the rear end electric valve at the moment;
2) When the gradient magnetic field filter enters a steady state, calculating real-time filtering efficiency according to the front-end particle number acquired by the front-end particle pollution degree sensor and the rear-end particle number acquired by the rear-end particle pollution degree sensor in real time, and calculating initial filtering efficiency within a set time period after the gradient magnetic field filter enters the steady state;
3) If the real-time filtration efficiency is less than or equal to 95% of the initial filtration efficiency, closing the gradient magnetic field filter, starting timing, and connecting the front end electric valve with the rear end electric valve through the precision filter element;
4) Judging whether the real-time differential pressure value acquired by the differential pressure sensor exceeds 50% of the differential pressure threshold value, if so, executing the step 5), otherwise, executing the step 6);
5) Judging whether the real-time differential pressure value exceeds 80% of the differential pressure threshold value, if not, executing the step 6), otherwise, stopping;
6) Judging whether the time in the step 3) reaches the set time, if not, executing the step 4), otherwise, executing the step 1).
Further, the real-time filtration efficiency is calculated by the following formula:
in the formula (I), the compound is shown in the specification,
in order to achieve a real-time filtering efficiency,
the number of rear-end particles collected by the rear-end particle pollution degree sensor,
the front-end particle count collected for the front-end particle contamination level sensor.
Further, the initial filtration efficiency is determined by the following procedure: within 10 minutes after the gradient magnetic field filter enters a steady state, acquiring a real-time filtering efficiency every other one minute, and calculating the initial filtering efficiency according to the acquired real-time filtering efficiency by the following formula:
in the formula (I), the compound is shown in the specification,
is the initial filtration efficiency.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize the flushing function of the magnetic gathering medium by arranging the precise filter element, the controller, the front end electric valve and the rear end electric valve without arranging a back flushing special pipeline and parts and adjusting the outlet of the front end electric valve to be connected with the rear end electric valve or the outlet of the front end electric valve to be connected with the rear end electric valve through the precise filter element without stopping, flushing a pump and other parts, has simple structure and solves the problem of complex structure caused by the fact that the magnetic gathering medium needs to be flushed through the back flushing special pipeline and parts in the prior art.
Furthermore, the precision filter core is adopted, so that the filtering precision is low, and the system operation cost is low.
According to the invention, by calculating the real-time filtering efficiency of the gradient magnetic field filter, when the real-time filtering efficiency is lower than 95% of the initial filtering efficiency, the washing is automatically carried out, so that the high-efficiency operation of a filtering system is ensured; in the flushing process, the particles during flushing are intercepted by the precise filter element, so that the particles are prevented from entering an oil system and influencing the oil system; according to the invention, the service life early warning of the fine filter element can be realized according to the real-time pressure difference value acquired by the pressure difference sensor during flushing, meanwhile, after the flushing is quitted, the fine filter element can be replaced, the filter element can be replaced without stopping equipment, the flushing and filtering operation can be realized directly through the quick switching of the front end electric valve and the rear end electric valve, and the flushing pump is not required to be started.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of a method of the present invention;
in the figure, 1 is a front-end particle pollution degree sensor; 2 is a gradient magnetic field filter; 3 is a rear-end particle pollution degree sensor; 4 is a front end electric valve; 5 is a rear end electric valve; 6 is a precise filter element; 7 is a differential pressure sensor; 8 is a controller; and 9 is a contactor.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the system for filtering ferromagnetic particles in electric oil of the present invention includes a controller 8, a front end particle contamination degree sensor 1, a gradient magnetic field filter 2, a rear end particle contamination degree sensor 3, a front end electric valve 4, a rear end electric valve 5, a precision filter element 6, a differential pressure sensor 7, and a contactor 9. The front end electro-active valve 4 comprises an inlet, a first outlet and a second outlet. The rear end electric valve 5 includes a first inlet, a second inlet, and an outlet.
Wherein, oil system sample connection links to each other with the oil system oil return opening through the oil circuit, it is preceding end particle pollution degree sensor 1 to have set gradually on the oil circuit, gradient magnetic field filter 2 and rear end particle pollution degree sensor 3, the oil circuit export links to each other with front end electric valve 4 entry, the first export of front end electric valve 4 links to each other with the first entry of rear end electric valve 5, the second export of front end electric valve 4 links to each other through the second entry of accurate filter core 6 with rear end electric valve 5, the exit linkage oil system oil return opening of rear end electric valve 5.
The precise filter element 6 is arranged in the fine filter container, the differential pressure sensor 7 is arranged on the fine filter container, and the differential pressure sensor 7 is used for measuring the pressure difference value of an inlet and an outlet of the fine filter container (preferably a fine filter tank); the gradient magnetic field filter 2 is connected to a contactor 9.
The front-end particle pollution degree sensor 1, the contactor 9, the rear-end particle pollution degree sensor 3, the front-end electric valve 4, the rear-end electric valve 5 and the differential pressure sensor 7 are all connected with the controller 8.
The controller 8 is an industrial controller, such as a PLC controller or an industrial personal computer, having a logic control function, a digital value, an analog value, and a communication function.
The front-end particle pollution degree sensor 1 and the rear-end particle pollution degree sensor 3 can be selected from particle pollutant sensors of OPCom II or CS1000 type, the particle pollutant sensors are powered by DC24V or DC12V, and the communication mode is RS485 communication.
The gradient magnetic field filter 2 adopts an electromagnetic magnetic separator which takes a magnetic gathering medium as magnetic conduction steel wool, the diameter of the magnetic conduction steel wool is 0.1mm-2mm, and the working voltage of the electromagnetic magnetic separator is 380V.
The front end electric valve 4 and the rear end electric valve 5 adopt two-position three-way type electric valves, the power supply voltage is DC12V, DC V or AC220V, and the communication mode is RS485 communication.
The filtering precision of the precise filter element 6 is 5 to 20um, the precise filter element 6 is powered by DC24V or DC12V, and the communication mode is RS485 communication.
The operating voltage of the control coil of the contactor 9 is DC24V, and the main contact current is not less than 10A.
According to the filtering system for ferromagnetic particles in oil for electric power, provided by the invention, the filtering element with lower filtering precision can be used for realizing higher filtering effect and filtering efficiency, a magnetic gathering medium can be washed without a back washing special pipeline, the particles can be intercepted when the washing is not stopped, the particles are prevented from entering the oil system and influencing the oil system, and the service life early warning of the precise filtering element can be realized.
Referring to fig. 2, another object of the present invention is to provide a method for filtering ferromagnetic particles in electric oil based on gradient magnetic field of the filtering system, comprising the following steps:
1) Starting a system, and setting a differential pressure threshold value p0;
2) The front-end particle pollution degree sensor 1 and the rear-end particle pollution degree sensor 3 are used for collecting the particle number n at the front end in real time 1 And the number of back-end particles n 2 And recording the front-end particle number n collected by the front-end particle pollution degree sensor 1 1 The unit is: the number n of rear-end particles collected by the rear-end particle pollution degree sensor 3 is recorded 2 The unit is: per mL;
3) Opening the gradient magnetic field filter 2, and adjusting the front end electric valve 4 and the rear end electric valve 5 to a main position, namely, an oil path sequentially passes through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4 and the rear end electric valve 5, and then enters a stage of purifying particles by the gradient magnetic field filter 2;
4) After the gradient magnetic field filter 2 is started for 30 minutes, the gradient magnetic field filter 2 enters a steady state, and the real-time filtration efficiency in the steady state is calculated
And calculating the initial filtering efficiency of the gradient magnetic field filter 2 within 10 minutes after the gradient magnetic field filter enters the steady stateRate of change
；
5) If real-time filtration efficiency
Greater than the initial filtration efficiency
95%, then step 4) is performed;
6) If real-time filtration efficiency
Less than or equal to the initial filtration efficiency
When the current time is 95 percent, the gradient magnetic field filter 2 is closed, the front end electric valve 4 and the rear end electric valve 5 are adjusted to bypass positions, namely, an oil path sequentially passes through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4, the precision filter element 6 and the rear end electric valve 5, enters a flushing link of the gradient magnetic field filter 2 at the moment, and starts to time for 15 minutes;
7) Acquiring real-time pressure difference p of the pressure difference sensor 7 in real time, judging whether the real-time pressure difference p exceeds 50% of a pressure difference threshold value p0 (determined according to actual needs, such as 0.2 MPa), if so, prompting the filter element replacement by the controller 8, and executing the step 8), otherwise, executing the step 9);
8) Judging whether the real-time differential pressure value p exceeds 80% of a differential pressure threshold value p0, if not, executing a step 9), otherwise, stopping the system;
9) Judging whether the 15 minutes of the time counting in the step 6) is reached, if not, executing the step 7), otherwise, executing the step 3);
example 1
The PLC with 8 digital input, 8 digital output and RS485 communication is used as the controller 8, and the front-end particle pollution degree sensor 1, the rear-end particle pollution degree sensor 3, the front-end electric valve 4, the rear-end electric valve 5 and the differential pressure sensor 7 are connected through the RS485 to obtain the front-end particle pollution degree sensorNumber of terminal particles n 1 Number of rear particles n 2 A value corresponding to the real-time pressure difference p; the digital output is sent to a control coil of a contactor 9, and a main contact of the contactor 9 is connected with the gradient magnetic field filter 2;
the front-end particle pollution degree sensor 1 and the rear-end particle pollution degree sensor 3 are powered by DC24V, and the communication method is RS485 communication.
The gradient magnetic field filter 2 adopts an electromagnetic magnetic separator which takes a magnetic gathering medium as magnetic conductive steel wool, the diameter of the magnetic conductive steel wool is 0.1mm, and the working voltage is 380V;
the front end electric valve 4 and the rear end electric valve 5 adopt two-position three-way type electric valves, the power supply voltage is DC24V, and the communication method is RS485 communication.
The filtering precision of the precise filter element 6 is 5um.
The differential pressure sensor 7 is powered by DC24V, and the communication method is RS485 communication.
The operating voltage of the control coil of the contactor 9 is DC24V and the main contact current is 10A.
A method for filtering ferromagnetic particles in gradient magnetic field electric oil comprises the following steps:
1) After the system is started, setting a pressure difference threshold value p0=0.2Mpa; real-time acquisition of front-end particle number n 1 1253 particles/mL, number of back-end particles n 2 1253 pieces/mL;
2) The PLC controller controls the contactor 9 to be opened, then the gradient magnetic field filter 2 is opened, a gradient magnetic field is established, the PLC controller adjusts the front end electric valve 4 and the rear end electric valve 5 to a main position through RS485, at the moment, an oil way sequentially passes through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4 and the rear end electric valve 5, and enters a stage of purifying particulate matters by the gradient magnetic field filter 2;
3) When the gradient magnetic field filter enters a steady state after being started for 30 minutes, the front-end particle pollution degree value is 1253/mL, the rear-end particle pollution degree value is 14/mL, and the real-time filtration efficiency is calculated
Entering a steady state in the gradient magnetic field filterReal-time filtration efficiency every minute for the next 10 minutes
Respectively 0.988 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 31 minutes), 0.987 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 32 minutes), 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 33 minutes), 0.991 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 34 minutes), 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 35 minutes), 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 36 minutes), 0.988 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 37 minutes), 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 38 minutes), 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 39 minutes) and 0.989 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 40 minutes), and the average value thereof is the initial filtration efficiency
；
4) The number of particles collected at the front end is 267/mL, the number of particles collected at the rear end is 17/mL, and the real-time filtration efficiency
0.936 less than or equal to the initial filtration efficiency
When the speed of the oil path is 95%, namely 0.989 x 95% =0.94, the PLC controller controls the contactor 9 to be closed, and then the gradient magnetic field filter 2 is closed, meanwhile, the PLC controller adjusts the front end electric valve 4 and the rear end electric valve 5 to bypass positions, the oil path is changed to enter a gradient magnetic field filter flushing link after sequentially passing through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4, the precision filter element 6 and the rear end electric valve 5, and the time is timed for 15 minutes;
5) The real-time pressure difference p of the real-time acquisition pressure difference sensor 7 is 0.06 Mpa, namely 0.2 x 50% =0.1Mpa, which does not exceed 50% of the pressure difference threshold value p0;
6) Step 2) is executed when 15 minutes have elapsed while the gradient magnetic field filter 2 was switched off.
After filtration using the filtration system of the present invention, the particulate matter changes as follows:
TABLE 1 particulate matter Change
| Initial front end particle number/mL | Initial back end particle count/mL | Number of front particles/mL after a period of time | Number of particles/mL at rear end after a period of time |
| 1253 | 14 | 267 | 17 |
As can be seen from table 1, the initial filtration efficiency is 1-14/1253=0.991, and as the system continues to operate, after a period of operation, the real-time filtration efficiency is 1-14/267=0.936, which is lower than the initial filtration efficiency, and satisfies 0.936 but 0.991 x 95%, so that the system is capable of gradient magnetic field filter flushing.
Example 2
A PLC with 14 digital input, 10 digital output and RS485 communication is used as a controller 8, and the front-end particle pollution degree sensor 1, the rear-end particle pollution degree sensor 3, the front-end electric valve 4, the rear-end electric valve 5 and the differential pressure sensor 7 are connected through the RS485 to obtain the number n of front-end particles 1 Number of rear particles n 2 A value corresponding to the real-time pressure difference p; the digital output is sent to a control coil of a contactor 9, and a main contact of the contactor 9 is connected with the gradient magnetic field filter 2;
the front-end particle pollution degree sensor 1 and the rear-end particle pollution degree sensor 3 are powered by DC12V, and the communication method is RS485 communication.
The gradient magnetic field filter 2 adopts an electromagnetic magnetic separator which takes a magnetic gathering medium as magnetic conductive steel wool, the diameter of the magnetic conductive steel wool is 1mm, and the working voltage is 380V.
The front end electric valve 4 and the rear end electric valve 5 adopt two-position three-way type electric valves, the power supply voltage is DC12V, and the communication method is RS485 communication.
The filtering precision of the precise filter element 6 is 20um.
The differential pressure sensor 7 is powered by DC12V, and the communication method is RS485 communication.
The working voltage of a control coil of the contactor 9 is DC12V, and the current of a main contact is 20A;
a method for filtering ferromagnetic particles in gradient magnetic field electric oil comprises the following steps:
1) After the system is started, setting a pressure difference threshold value p0=0.20Mpa; collecting a front-end particle pollution degree value of 1546/mL and a rear-end particle pollution degree value of 1546/mL in real time;
2) The PLC controller controls the contactor 9 to be opened, then the gradient magnetic field filter 2 is opened, a gradient magnetic field is established, the PLC controller adjusts the front end electric valve 4 and the rear end electric valve 5 to a main position through the RS485, an oil path sequentially passes through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4 and the rear end electric valve 5, and enters a stage of purifying particulate matters by the gradient magnetic field filter;
3) When the gradient magnetic field filter 2 enters a steady state 30 minutes after being started, the number of front-end particles is 1546/mL, the number of rear-end particles is 22/mL, and the real-time filtering efficiency is calculated
Real-time filtration efficiency at intervals of one minute within 10 minutes after the gradient magnetic field filter 2 enters the steady state
Respectively 0.986 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 31 minutes), 0.984 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 32 minutes), 0.986 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 33 minutes), 0.986 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 34 minutes), 0.984 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 35 minutes), 0.986 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 36 minutes), 0.985 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 37 minutes), 0.984 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 38 minutes), 0.985 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 39 minutes) and 0.985 (namely the real-time filtration efficiency when the gradient magnetic field filter is started for 40 minutes), and the average value thereof is the initial filtration efficiency
；
4) The number of front-end particles is 351/mL, the number of rear-end particles is 24/mL, and the real-time filtration efficiency is high
0.932, less than or equal to the initial filtration efficiency
When the speed of the oil path is 95%, namely 0.985 × 95% =0.936, the PLC controller controls the contactor 9 to be closed, and then the gradient magnetic field filter 2 is closed, and meanwhile, the PLC controller adjusts the front end electric valve 4 and the rear end electric valve 5 to bypass positions, the oil path is changed to enter a gradient magnetic field filter flushing link after sequentially passing through the front end particle pollution degree sensor 1, the gradient magnetic field filter 2, the rear end particle pollution degree sensor 3, the front end electric valve 4, the precision filter element 6 and the rear end electric valve 5, and the time is timed for 15 minutes;
5) The real-time pressure difference value p of the pressure difference sensor 7 is acquired in real time and is 0.12 Mpa, namely 0.2 x 50% =0.1Mpa, and exceeds 50% of the pressure difference threshold value p0, and the controller 8 prompts the replacement of a filter element;
6) The real-time pressure difference p of the real-time acquisition pressure difference sensor 7 is 0.12 Mpa, namely 0.2 x 80% =0.16Mpa, and does not exceed 80% of the pressure difference threshold value p0;
7) When the gradient magnetic field filter is closed for a time of 15 minutes, step 2) is executed.
Using the present invention, the particulate matter changes as follows in Table 2:
table 2 particulate matter Change
| Initial front end particle number/mL | Initial back end particle count/mL | Number of particles/mL at front end after a period of time | Number of particles/mL at rear end after a period of time |
| 1546 | 11 | 351 | 24 |
As can be seen from table 2, the initial filtration efficiency was 1-22/1546=0.986, and as the system was continuously operated, the real-time filtration efficiency after a certain period of operation was 1-24/351=0.932, which was lower than the initial filtration efficiency, and satisfied 0.932-straw 0.986 × 95%, so that the system was capable of gradient magnetic field filter flushing.
Claims (7)
1. A method for filtering ferromagnetic particles in electric oil of a ferromagnetic particle filtering system in the electric oil of a gradient magnetic field is characterized in that the filtering method adopts the ferromagnetic particle filtering system in the electric oil of the gradient magnetic field, and the filtering system comprises a precise filter element (6), a controller (8), a front-end particle pollution degree sensor (1), a gradient magnetic field filter (2), a rear-end particle pollution degree sensor (3), a front-end electric valve (4) and a rear-end electric valve (5) which are arranged on an oil circuit, wherein the front-end particle pollution degree sensor (1) is connected with the gradient magnetic field filter (2), the gradient magnetic field filter (2) is connected with the rear-end particle pollution degree sensor (3), the rear-end particle pollution degree sensor (3) is connected with an inlet of the front-end electric valve (4), an outlet of the front-end electric valve (4) is divided into two paths, one path is connected with one inlet of the rear-end electric valve (5), and the other path is connected with the other inlet of the rear-end electric valve (5) through the precise filter element (6); the front-end particle pollution degree sensor (1), the gradient magnetic field filter (2), the rear-end particle pollution degree sensor (3), the front-end electric valve (4) and the rear-end electric valve (5) are connected with a controller (8);
the precise filter element (6) is arranged in the precise filter container, a differential pressure sensor (7) is arranged on the precise filter container, and the differential pressure sensor (7) is connected with the controller (8);
the filtration method comprises the following steps:
1) Setting a pressure difference threshold value; starting the gradient magnetic field filter (2), establishing a gradient magnetic field, and connecting the front end electric valve (4) with the rear end electric valve (5) at the moment;
2) When the gradient magnetic field filter (2) enters a steady state, calculating real-time filtering efficiency according to the front-end particle number acquired by the front-end particle pollution degree sensor (1) and the rear-end particle number acquired by the rear-end particle pollution degree sensor (3) in real time, and calculating initial filtering efficiency within a set time period after the gradient magnetic field filter (2) enters the steady state;
3) If the real-time filtration efficiency is less than or equal to 95% of the initial filtration efficiency, closing the gradient magnetic field filter (2), starting timing, and connecting the front end electric valve (4) with the rear end electric valve (5) through the precision filter element (6); if real-time filtration efficiency
Greater than the initial filtration efficiency
95%, then step 2) is performed; the initial filtration efficiency is determined by the following procedure: within 10 minutes after the gradient magnetic field filter enters the steady state, acquiring a real-time filtering efficiency every other one minute, and calculating the initial filtering efficiency according to the acquired real-time filtering efficiency by the following formula:
in the formula (I), the compound is shown in the specification,
in order to provide an initial filtering efficiency,
real-time filtration efficiency;
4) Judging whether the real-time differential pressure value acquired by the differential pressure sensor (7) exceeds 50% of a differential pressure threshold value, if so, executing the step 5), otherwise, executing the step 6);
5) Judging whether the real-time differential pressure value exceeds 80% of the differential pressure threshold value, if not, executing the step 6), otherwise, stopping;
6) Judging whether the time in the step 3) reaches the set time, if not, executing the step 4), otherwise, executing the step 1).
2. The method of claim 1, wherein the real-time filtration efficiency is calculated by the following equation:
in the formula (I), the compound is shown in the specification,
for real-time filtering efficiency，
The number of rear-end particles collected by the rear-end particle pollution degree sensor,
the front-end particle count collected for the front-end particle contamination level sensor.
3. The method for filtering ferromagnetic particles in electric oil according to claim 1, further comprising a contactor (9) connected to the gradient magnetic field filter (2), wherein the contactor (9) is connected to the controller (8).
4. The method for filtering ferromagnetic particles in electric oil according to claim 1, wherein the controller (8) is a PLC controller or an industrial personal computer.
5. The method for filtering the ferromagnetic particles in the electric oil according to claim 1, wherein the gradient magnetic field filter (2) is an electromagnetic magnetic separator using a magnetic gathering medium as magnetic steel wool.
6. The method for filtering the ferromagnetic particles in the electric oil according to claim 1, wherein the front end electric valve (4) and the rear end electric valve (5) are two-position three-way type electric valves.
7. The method for filtering the ferromagnetic particles in the electric oil according to claim 1, wherein the precision filter element (6) has a filtering precision of 5 to 20 μm.
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