CN202822993U - Vacuum static oil filter - Google Patents
Vacuum static oil filter Download PDFInfo
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- CN202822993U CN202822993U CN2012205329100U CN201220532910U CN202822993U CN 202822993 U CN202822993 U CN 202822993U CN 2012205329100 U CN2012205329100 U CN 2012205329100U CN 201220532910 U CN201220532910 U CN 201220532910U CN 202822993 U CN202822993 U CN 202822993U
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Abstract
The utility model discloses a vacuum static oil filter. The vacuum static oil filter is characterized by comprising a pretreatment mechanism, a vacuum oil filtering mechanism and a static oil filtering mechanism, wherein the static oil filtering mechanism comprises an oil pump motor group, a pre-filter, a charging mixer, a collector, a high-voltage charging power supply and an electrical control box which are sequentially arranged along an oil inlet; the high-voltage charging power supply is electrically connected with the charging mixer; the electrical control box is respectively and electrically connected with the high-voltage charging power supply and the oil pump motor group; and drain valves are arranged on the bottoms of the pre-filter, the charging mixer and the collector. The vacuum static oil filter has the benefits that the sensitiveness of a static part to water is lowered, and thus the vacuum static oil filter still can normally work when the water content is more than a certain value; a vacuum part and the static part can simultaneously work, so that the work efficiency is improved; oil sludge inside the filter can be timely and efficiently removed, the cleanliness can reach the level-3 in NAS (National Aircraft Standards), and the operation reliability and stability of the filter are improved; and the water content in an oil product can be kept below 50ppm.
Description
Technical field
The utility model relates to a kind of oil filter, is specifically related to a kind of vacuum static electricity oil filter.
Background technology
Contain the pollutants such as impurity, moisture content in the oil products such as turbine oil, hydraulic oil, fire resistant oil, especially operating steam turbine oil inevitably will contact with moisture content, and water and oil product reaction form acid, colloid and greasy filth, also can separate out simultaneously the additive in the oil.Water can not only reduce the wearing and tearing of oily greasy property, corroding metal, acceleration Hydraulic Elements, and it can also cause the bonding of control valve, and is very harmful to equipment.Mechanical admixture and greasy filth can destroy wearing and tearing, obstruction spool and the filter of oil film, acceleration equipment, cause operating equipment fault.Therefore, remove moisture content and mechanical admixture in the oil, allow oil product keep very clean state always, not only can reduce the fault rate of equipment, and can reduce the replacing number of times of oil product.
The vacuum oil filtering equipment that generally uses at present mainly contains two kinds: a kind ofly be vacuum oil-filter, another kind is the vacuum static electricity oil filter.Yet there is certain defective in design in vacuum oil-filter: without moisture transducer, automaticity is low, filtering accuracy is not high, filter core service life short, mechanical filter can't be removed the particle below the 3 μ m.So the scope of application of vacuum oil-filter is subject to certain restrictions.Oil machine between the filter of existing vacuum static electricity since its static part to moisture-sensitive, water content surpasses certain numerical value just can't work, so inefficiency and flow little (maximum 30L/min).
The utility model content
Be to solve the deficiencies in the prior art, the purpose of this utility model is to provide a kind of, high efficiency insensitive to moisture, vacuum static electricity oil filter that flow is large, and this vacuum static electricity oil filter can remove the following particle of 3 μ m, and filtering accuracy is high.
In order to realize above-mentioned target, the utility model adopts following technical scheme:
A kind of vacuum static electricity oil filter is characterized in that, comprising:
The preliminary treatment mechanism that is communicated with oil-in,
The vacuum oil filtering mechanism and the static oil strain mechanism that are communicated with aforementioned preliminary treatment mechanism two outlets respectively;
The outlet of aforementioned vacuum oil filtering mechanism is communicated with the import of static oil strain mechanism;
Aforementioned preliminary treatment mechanism comprises: the moisture transducer, coarse filter, the constant temperature electric heater that set gradually along oil-in;
Aforementioned vacuum oil filtering mechanism comprises: the vacuum oil filtering chamber, with the condenser that upper end, aforementioned vacuum oil filtering chamber is communicated with, the vavuum pump that is communicated with aforementioned condenser;
Aforementioned static oil strain mechanism comprises: the Oil pump electrical machinery group, prefilter, charging flow mixing device, the collector that set gradually along oil-in, and the high voltage charging power supply that is electrically connected with aforementioned charging flow mixing device, the electric control box that is electrically connected with aforementioned high voltage charging power supply and Oil pump electrical machinery group respectively.
Aforesaid vacuum static electricity oil filter is characterized in that, between aforementioned Oil pump electrical machinery group and the prefilter, be respectively arranged with pressure switch between charging flow mixing device and the collector, the aforementioned pressure switch is electrically connected with electric control box.
Aforesaid vacuum static electricity oil filter is characterized in that, indoor atomizer, filler, the liquid-level switch of being disposed with from top to bottom of aforementioned vacuum oil filtering.
Aforesaid vacuum static electricity oil filter is characterized in that, also comprises the vacuum pressure regulating system that is communicated with aforementioned vacuum oil filtering chamber, and aforementioned vacuum pressure regulating system comprises successively: vacuum switch, magnetic valve, air flow rate adjustment valve, air dryer.
Aforesaid vacuum static electricity oil filter is characterized in that, aforementioned charging flow mixing device comprises: shell, be arranged at positive electrode, negative electrode in the aforementioned shell, and aforementioned positive electrode, negative electrode are connected with high voltage charging power supply by high-tension bus-bar.
Aforesaid vacuum static electricity oil filter is characterized in that, also is provided with oil water separator between aforementioned condenser and the vavuum pump, and aforementioned oil water separator bottom is connected with water tank.
Aforesaid vacuum static electricity oil filter is characterized in that, also is disposed with between aforementioned preliminary treatment mechanism and the vacuum oil filtering mechanism: magnetic valve, flow control valve, check valve.
Aforesaid vacuum static electricity oil filter is characterized in that, the bottom of aforementioned prefilter, charging flow mixing device, collector is provided with blowoff valve.
Usefulness of the present utility model is: positive and negative electrode is outside equipped with insulation crust in the charging flow mixing device, and the insulating properties between two electrodes is fine, and is insensitive to moisture, and water content surpasses certain numerical value and still can work; Vacuum section and static part can be worked simultaneously, have improved operating efficiency, have increased flow; Can remove the submicron particles thing, cleannes can reach the NAS3 level, can in time, effectively remove intrasystem pollutant, and can suppress the regeneration of elasticity oxide, greasy filth, have improved equipment reliability of operation and stability; Water content can remain on below the 50ppm in the oil product.
Description of drawings
Fig. 1 is the structural representation of a specific embodiment of the utility model vacuum static electricity oil filter;
The implication of Reference numeral among the figure: 1-oil-in, 2-moisture transducer, 3-coarse filter, the 4-constant temperature electric heater, 5-magnetic valve, 6-magnetic valve, the 7-flow control valve, 8-check valve, 9-vacuum oil filtering chamber, the 91-atomizer, 92-filler, 93(94,95)-liquid-level switch, the 10-magnetic valve, 11-vacuum meter, 12-vacuum switch, the 13-condenser, 14-oil water separator, 15-vavuum pump, the 16-water tank, 17-vacuum switch, 18-magnetic valve, the 19-air flow rate adjustment valve, 20-air dryer, 21-magnetic valve, the 22-magnetic valve, 23-Oil pump electrical machinery group, 24-pressure switch, 25-Pressure gauge, the 26-prefilter, 261-prefilter filter core, 262-prefilter blowoff valve, the 27-flow mixing device that charges, the 270-shell, 271-negative electrode insulation crust, 272-positive electrode insulation crust, 273-negative electrode, the 274-positive electrode, the 275-high-tension bus-bar, 276-charging flow mixing device blowoff valve, 28-pressure switch, the 29-Pressure gauge, the 30-collector, 301-collector filter core, 302-collector blowoff valve, the fuel-displaced valve of 31-, the 32-electric control box, 33-high voltage charging power supply, 34-oil-out.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done concrete introduction.
With reference to Fig. 1, vacuum static electricity oil filter of the present utility model comprises: preliminary treatment mechanism, vacuum oil filtering mechanism and static oil strain mechanism.Preliminary treatment mechanism is communicated with oil-in 1, comprising: along moisture transducer 2, coarse filter 3, constant temperature electric heater 4 that oil-in 1 sets gradually, this preliminary treatment mechanism also has two outlets; Vacuum oil filtering mechanism is communicated with an outlet of preliminary treatment mechanism, comprising: vacuum oil filtering chamber 9, the condenser 13 that is communicated with 9 upper ends, vacuum oil filtering chamber, the vavuum pump 15 that is communicated with condenser 13; Static oil strain mechanism is communicated with another outlet of preliminary treatment mechanism, comprise: the Oil pump electrical machinery group 23 that sets gradually along oil-in, prefilter 26, charging flow mixing device 27, collector 30, and the high voltage charging power supply 33 that is electrically connected with charging flow mixing device 27, the electric control box 32 that is electrically connected with high voltage charging power supply 33 and Oil pump electrical machinery group 23 respectively.The higher oil product of moisture at first enters vacuum oil filtering mechanism and dewaters, and then enters static oil strain mechanism and carry out removal of impurities, so the outlet of vacuum oil filtering mechanism is communicated with the import of static oil strain mechanism.
The below introduces the vacuum oil filtering part in detail.Vacuum oil filtering chamber 9 is used for removing the more moisture of oil product, mainly realize by transpiring moisture, concrete, be disposed with from top to bottom atomizer 91, filler 92, liquid- level switch 93,94,95 in the vacuum oil filtering chamber 9, liquid- level switch 93,94,95 successively decreases successively apart from the distance of 9 bottom surfaces, vacuum oil filtering chamber.After the evaporation of moisture in the oil product after the atomizing, lead to condenser 13 from the upper end of vacuum oil filtering chamber 9, as a kind of preferred, be disposed with between vacuum oil filtering chamber 9 and the condenser 13: magnetic valve 10, vacuum meter 11, vacuum switch 12.
Most of steam all can be condensed into water and flow out under the effect of condenser 13, be not condensed but still have a small amount of steam, so as a kind of preferred, also be provided with oil water separator 14 between condenser 13 and the vavuum pump 15, oil water separator 14 bottoms are connected with water tank 16.By Re-isolation, discharge from vavuum pump 15 by last clean gas through oil water separator 14 time for a small amount of steam that is not condensed.
As a kind of preferred scheme, the utility model also comprises the vacuum pressure regulating system, and this vacuum pressure regulating system is communicated with vacuum oil filtering chamber 9, comprises successively: vacuum switch 17, magnetic valve 18, air flow rate adjustment valve 19, air dryer 20.This vacuum pressure regulating system be used for to be regulated the amount that air enters vacuum oil filtering chamber 9, guarantees that the vacuum of vacuum oil filtering chamber 9 remains on about 0.08MPa always, thus guarantee vacuum oil filtering in order, stable carrying out.
As a kind of preferred scheme, also be disposed with between preliminary treatment mechanism and the vacuum oil filtering mechanism: magnetic valve 6, flow control valve 7, check valve 8.Therefore, the oil product that enters in the vacuum oil filtering chamber 9 is an amount of, unidirectional, can guarantee that vacuum oil filtering is orderly, stablize and carry out.
The higher oil product of moisture has been removed most of moisture after the processing of above-mentioned vacuum oil filtering mechanism, next will enter static oil strain mechanism and carry out removal of impurities, and the below introduces static oil strain mechanism in detail.
The entrance of static oil strain mechanism is communicated with the outlet of vacuum oil filtering mechanism, by magnetic valve 21 controls.Under the drive of Oil pump electrical machinery group 23, oil product carries out removal of impurities through prefilter 26, charging flow mixing device 27, collector 30 successively.Wherein, prefilter 26 inside are provided with prefilter filter core 261, are used for oil product is carried out removal of impurities, can remove most of particle, and as a kind of preferred scheme, the bottom of prefilter 26 is provided with prefilter blowoff valve 262.
Charging flow mixing device 27 comprises: shell 270 is arranged at positive electrode 274, negative electrode 273 in the shell 270.Positive electrode 274, negative electrode 273 are connected with high voltage charging power supply 33 by high-tension bus-bar 275, and high voltage charging power supply 33 is electrically connected with electric control box 32.Wherein, positive electrode 274, negative electrode 273 outsides are respectively arranged with positive electrode insulation crust 272, negative electrode insulation crust 271, in order to positive and negative two electrodes that insulate.
As a kind of preferred scheme, the bottom of charging flow mixing device 27 is provided with charging flow mixing device blowoff valve 276.
As a kind of preferred scheme, between Oil pump electrical machinery group 23 and the prefilter 26, be respectively arranged with pressure switch 24,28 between charging flow mixing device 27 and the collector 30, pressure switch 24,28 is electrically connected with electric control box 32 respectively.For the convenient pressure of observing, between pressure switch 24 and the prefilter 26 Pressure gauge 25 is installed, between pressure switch 28 and the collector 30 Pressure gauge 29 is installed.
For the qualified oil product of moisture, need not the water treatment that removes through vacuum oil filtering mechanism, can directly enter static oil strain mechanism and carry out removal of impurities, concrete, between the entrance of the outlet of preliminary treatment mechanism and static oil strain mechanism, oil pipeline is set, and at pipeline magnetic valve 22 is set and controls.
With reference to Fig. 1, the below introduces the course of work of vacuum static electricity oil filter of the present utility model in detail, and it has two kinds of duties:
Duty when one, moisture is higher in the oil product
After vacuum oil-filter starts, vavuum pump 15 is started working, when vacuum greater than 0.06MPa, pending oil product is under the effect of vavuum pump 15, after out process moisture transducer 2 carries out the moisture content test from fuel tank, the oil product that water content is high, filter by coarse filter 3, the filtering large granular impurity enters constant temperature electric heater 4 again and heats, and stream of hot oil is crossed magnetic valve 5, magnetic valve 6, flow control valve 7, check valve 8 enters vacuum oil filtering chamber 9, by atomizer 91 ejections, moisture is start vaporizer, and mist of oil drops on the filler 92, in the vacuum oil filtering chamber 9 interior form three-dimensional, multifaceted Steaming structure.The steam of evaporation is by magnetic valve 10, flow to condenser 13, most of water vapor is condensed into water and deposits water tank 16 in again, outside water tank 16 discharge machines, by Re-isolation, discharge from vavuum pump 15 by last clean gas through oil water separator 14 time for a small amount of steam that is not condensed.Flow out from filler 92 through dehydration, degassed oil product, flow to the bottom of vacuum oil filtering chamber 9, when the oil product liquid level is higher than liquid-level switch 93, magnetic valve 6 is failure to actuate, enter vacuum oil filtering chamber 9 without oil product, simultaneously Oil pump electrical machinery group 23 is outwards pumped from 9 bottoms, vacuum oil filtering chamber, and when the oil product liquid level arrived liquid-level switch 94, magnetic valve 6 was opened; When the oil product liquid level was lower than liquid-level switch 95, Oil pump electrical machinery group 23 stopped oil pumping; When the oil product liquid level arrived liquid-level switch 94, Oil pump electrical machinery group 23 started again, and like this, the oil product liquid level in the vacuum oil filtering chamber 9 maintains between liquid- level switch 93 and 95 always.Enter prefilter 26 through dehydration, degassed oil product through pressure switch 24, Pressure gauge 25 under 23 effects of Oil pump electrical machinery group, filter through prefilter filter core 261, most of pollutant is stayed on the prefilter filter core 261; High voltage charging power supply 33 just, negative pole by high-tension bus-bar 275 respectively with the charging flow mixing device 27 positive electrode 274, negative electrode 273 connects, after the oil product that further filters enters charging flow mixing device 27, positive electrode 274, negative electrode 273 is given respectively their fluid of the flowing through lotus that becomes positively charged separately, negative electrical charge, the particle of these oppositely chargeds attracts each other in conjunction with generating slightly large particle, through pressure switch 28, Pressure gauge 29, enter collector 30, last slightly large particle is all filtered out by collector filter core 301, filter clean oil product and turned back in the fuel tank by oil-out 34 through fuel-displaced valve 31, can reach the NAS3 level through repeatedly circulating.
When vacuum during greater than 0.085MPa, vacuum switch 12 actions that are connected with vavuum pump 15, magnetic valve 18 is opened, the drying of air by air dryer 20, filter after, enter vacuum oil filtering chamber 9 through air flow rate adjustment valve 19, magnetic valve 18, vacuum switch 17 again, can control the amount that air enters vacuum oil filtering chamber 9 by regulating air flow rate adjustment valve 19, its vacuum one is really remained on about 0.08MPa.
Duty when two, moisture is low in the oil product
After the vacuum static electricity oil filter starts, vavuum pump 15 is started working, when vacuum greater than 0.06MPa, pending oil product is under the effect of vavuum pump 15, pass through moisture transducer 2 by behind the moisture measurement from fuel tank, moisture is qualified, vavuum pump 15 quits work, magnetic valve 6 cuts out, and oil product filters the filtering large granular impurity by coarse filter 3 under the effect of Oil pump electrical machinery group 23, entering heater 4 heats again, stream of hot oil is crossed magnetic valve 5, magnetic valve 22, pressure switch 24 and Pressure gauge 25 enter prefilter 26, filter through prefilter filter core 261, and most of pollutant is stayed on the prefilter filter core 261; High voltage charging power supply 33 just, negative pole by high-tension bus-bar 275 respectively with the charging flow mixing device 27 positive electrode 274, negative electrode 273 connects, after the oil product that further filters enters charging flow mixing device 27, positive electrode 274, negative electrode 273 is given respectively their fluid of the flowing through lotus that becomes positively charged separately, negative electrical charge, the particle of these oppositely chargeds attracts each other in conjunction with generating slightly large particle, through pressure switch 28, Pressure gauge 29, enter collector 30, last slightly large particle is all filtered out by collector filter core 301, filter clean oil product and turned back in the fuel tank by oil-out 34 through fuel-displaced valve 31, can reach the NAS3 level through repeatedly circulating.
Need to prove that above-described embodiment does not limit the utility model in any form, all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in the protection domain of the present utility model.
Claims (8)
1. the vacuum static electricity oil filter is characterized in that, comprising:
The preliminary treatment mechanism that is communicated with oil-in;
The vacuum oil filtering mechanism and the static oil strain mechanism that are communicated with above-mentioned preliminary treatment mechanism outlet respectively;
The outlet of above-mentioned vacuum oil filtering mechanism is communicated with the import of static oil strain mechanism;
Above-mentioned preliminary treatment mechanism comprises: the moisture transducer, coarse filter, the constant temperature electric heater that set gradually along oil-in;
Above-mentioned vacuum oil filtering mechanism comprises: the vacuum oil filtering chamber, with the condenser that upper end, above-mentioned vacuum oil filtering chamber is communicated with, the vavuum pump that is communicated with above-mentioned condenser;
Above-mentioned static oil strain mechanism comprises: the Oil pump electrical machinery group, prefilter, charging flow mixing device, the collector that set gradually along oil-in, and the high voltage charging power supply that is electrically connected with above-mentioned charging flow mixing device, the electric control box that is electrically connected with above-mentioned high voltage charging power supply and Oil pump electrical machinery group respectively.
2. vacuum static electricity oil filter according to claim 1 is characterized in that, between above-mentioned Oil pump electrical machinery group and the prefilter, be respectively arranged with pressure switch between charging flow mixing device and the collector, above-mentioned pressure switch is electrically connected with electric control box.
3. vacuum static electricity oil filter according to claim 1 is characterized in that, indoor atomizer, filler, the liquid-level switch of being disposed with from top to bottom of above-mentioned vacuum oil filtering.
4. vacuum static electricity oil filter according to claim 3, it is characterized in that, also comprise the vacuum pressure regulating system that is communicated with above-mentioned vacuum oil filtering chamber, above-mentioned vacuum pressure regulating system comprises successively: vacuum switch, magnetic valve, air flow rate adjustment valve, air dryer.
5. vacuum static electricity oil filter according to claim 1 is characterized in that, above-mentioned charging flow mixing device comprises: shell, be arranged at positive electrode, negative electrode in the above-mentioned shell, and above-mentioned positive electrode, negative electrode are electrically connected with high voltage charging power supply by high-tension bus-bar.
6. vacuum static electricity oil filter according to claim 1 is characterized in that, also is provided with oil water separator between above-mentioned condenser and the vavuum pump, and above-mentioned oil water separator bottom is connected with water tank.
7. vacuum static electricity oil filter according to claim 1 is characterized in that, also is disposed with between above-mentioned preliminary treatment mechanism and the vacuum oil filtering mechanism: magnetic valve, flow control valve, check valve.
8. according to claim 1 to the described vacuum static electricity oil filter of 7 any one claims, it is characterized in that the bottom of above-mentioned prefilter, charging flow mixing device, collector is provided with blowoff valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205329100U CN202822993U (en) | 2012-10-18 | 2012-10-18 | Vacuum static oil filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205329100U CN202822993U (en) | 2012-10-18 | 2012-10-18 | Vacuum static oil filter |
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| CN202822993U true CN202822993U (en) | 2013-03-27 |
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| CN2012205329100U Expired - Fee Related CN202822993U (en) | 2012-10-18 | 2012-10-18 | Vacuum static oil filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847371A (en) * | 2012-10-18 | 2013-01-02 | 昆山威胜达环保设备有限公司 | Vacuum electrostatic oil filter |
| CN103285657A (en) * | 2013-07-01 | 2013-09-11 | 昆山威胜达环保设备有限公司 | Electric-charge-type vacuum oil filter |
| CN103575538A (en) * | 2013-10-12 | 2014-02-12 | 广西玉柴机器股份有限公司 | Method for purifying old engine oil for delivery test of engine |
| CN105920879A (en) * | 2016-06-20 | 2016-09-07 | 常州威肯过滤分离环保技术有限公司 | Variable-frequency oil-water separation equipment |
| CN105920880A (en) * | 2016-06-20 | 2016-09-07 | 常州威肯过滤分离环保技术有限公司 | Inverse suction prevention and balanced air distribution type oil-water separation vacuum tank |
| CN109337711A (en) * | 2018-12-03 | 2019-02-15 | 河北科技师范学院 | A kind of hydraulic oil circulation purifier |
-
2012
- 2012-10-18 CN CN2012205329100U patent/CN202822993U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847371A (en) * | 2012-10-18 | 2013-01-02 | 昆山威胜达环保设备有限公司 | Vacuum electrostatic oil filter |
| CN102847371B (en) * | 2012-10-18 | 2015-02-18 | 昆山威胜达环保设备有限公司 | Vacuum electrostatic oil filter |
| CN103285657A (en) * | 2013-07-01 | 2013-09-11 | 昆山威胜达环保设备有限公司 | Electric-charge-type vacuum oil filter |
| CN103575538A (en) * | 2013-10-12 | 2014-02-12 | 广西玉柴机器股份有限公司 | Method for purifying old engine oil for delivery test of engine |
| CN105920879A (en) * | 2016-06-20 | 2016-09-07 | 常州威肯过滤分离环保技术有限公司 | Variable-frequency oil-water separation equipment |
| CN105920880A (en) * | 2016-06-20 | 2016-09-07 | 常州威肯过滤分离环保技术有限公司 | Inverse suction prevention and balanced air distribution type oil-water separation vacuum tank |
| CN105920880B (en) * | 2016-06-20 | 2018-05-15 | 常州威肯过滤分离环保技术有限公司 | Anti-suck type equilibrium gas distribution formula water-oil separating vacuum tank |
| CN105920879B (en) * | 2016-06-20 | 2018-05-15 | 常州威肯过滤分离环保技术有限公司 | Frequency conversion type oily water separating equipment |
| CN109337711A (en) * | 2018-12-03 | 2019-02-15 | 河北科技师范学院 | A kind of hydraulic oil circulation purifier |
| CN109337711B (en) * | 2018-12-03 | 2020-11-06 | 河北科技师范学院 | Hydraulic oil circulation clarification plant |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20181018 |
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| CF01 | Termination of patent right due to non-payment of annual fee |