CN205383390U - Can eliminate installing the system of incrustation scale in pipeline - Google Patents

Can eliminate installing the system of incrustation scale in pipeline Download PDF

Info

Publication number
CN205383390U
CN205383390U CN201620075414.5U CN201620075414U CN205383390U CN 205383390 U CN205383390 U CN 205383390U CN 201620075414 U CN201620075414 U CN 201620075414U CN 205383390 U CN205383390 U CN 205383390U
Authority
CN
China
Prior art keywords
pipeline
water
wall
outlet pipe
incrustation scale
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201620075414.5U
Other languages
Chinese (zh)
Inventor
吴宁
齐冬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Zhonglian Tianheng Technology Co Ltd
Original Assignee
Sichuan Zhonglian Tianheng Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Zhonglian Tianheng Technology Co Ltd filed Critical Sichuan Zhonglian Tianheng Technology Co Ltd
Priority to CN201620075414.5U priority Critical patent/CN205383390U/en
Application granted granted Critical
Publication of CN205383390U publication Critical patent/CN205383390U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The utility model discloses a can eliminate installing the system of incrustation scale in pipeline, the owner advances water piping connection has water holding tank, water holding tank is connected with outlet pipe no. 1 and outlet pipe no. 2, outlet pipe no. 1 is connected with the elevated flume, the elevated flume is connected with the pipe of registering one's residence, be provided with water pump no. 1 on the outlet pipe no. 1, outlet pipe no. 2 is connected with the pond, be provided with warm water pot stove between water holding tank and pond, warm water cooling generator and refrigerator, be provided with water pump no. 2 on the outlet pipe no. 2, the refrigerator is connected with the cooling tower, be provided with cooling tube and recovery tube between refrigerator and the cooling tower, the pond below is provided with the circulating pipe, be provided with the filter screen in the circulating pipe, outer wall at main inlet tube, the outer wall of outlet pipe no. 1, the outer wall of outlet pipe no. 2, the outer wall of cooling tube and the outer wall of circulating pipe have all registrated the scale removal device. This system's utilization magnetization principle can be eliminated the incrustation scale in the pipeline for the pipeline can keep the noncongestion, and the activity of water has been improved moreover to water delivery efficient, uses also safelyr.

Description

A kind of can eliminate the installation system of incrustation scale in pipeline
Technical field
This utility model relates to a kind of system, especially relates to a kind of to eliminate the installation system of incrustation scale in pipeline.
Background technology
Water containing mineral such as calcium and magnesium salts is called " hard water ".River, lake water, well water and spring water are all hard water.Tap water is that river, lake water or well water pass through sedimentation, removes silt, obtains, be also hard water after disinfection.Sleet under just, without mineral in water, is " soft water ".After water is boiled, a part of water evaporates, and the calcium sulfate precipitation of good dissolving did not get off originally.The calcium bicarbonate originally dissolved and magnesium bicarbonate, decompose in the water of boiling, release carbon dioxide, become insoluble calcium carbonate and magnesium hydroxide also precipitates, sometimes also can generate MgCO3.Material is thus formed incrustation scale.Hard scale is generally cemented in container or pipe surface.First, hard scale heat conductivity is very poor, can cause that heating surface heat transfer situation worsens, thus wasting fuel or electric power.Secondly, if hard scale is cemented in water heater or boiler inner wall, also can owing to expanding with heat and contract with cold and unbalance stress, the danger that increase water heater and boiler explosion are even exploded greatly.Secondly, when hard scale is cementing, also usually can adhere to plurality of heavy metal ion, if this container is used for containing drinking water, have heavy metal ion and be too much dissolved in the risk of drinking-water.Therefore, the harm of hard scale is apparent from.Incrustation scale fragment enters in stomach can discharge calcium ions and magnesium ions and carbon dioxide with hydrochloric acid reaction, and the former is lithogenous necessary material, but incrustation scale and calculus are not directly dependent upon.The latter then can make people's flatulence, feel bad, and gastric ulcer patient is it may also happen that the danger of gastric perforation.
Utility model content
The purpose of this utility model can condense incrustation scale after being in that to overcome in above-mentioned existing aqueduct long-time use, cause line clogging, the problem affecting the emptying effectiveness of pipeline, devise and a kind of can eliminate the installation system of incrustation scale in pipeline, this system utilizes magnetization principle, incrustation scale in pipeline can be eliminated, make pipeline can keep unimpeded, the efficiency of water delivery is high, and improve the activity of water, use also safer, solve in existing aqueduct long-time use after can condense incrustation scale, cause line clogging, the problem affecting the emptying effectiveness of pipeline.
nullThe purpose of this utility model is achieved through the following technical solutions: a kind of can eliminate the installation system of incrustation scale in pipeline,Including main water inlet tube,Described main water inlet tube is connected to Storage water tank,Storage water tank is connected to outlet pipe one and outlet pipe two,Outlet pipe one is connected to elevated flume away from one end of Storage water tank,Elevated flume is connected to pipe of registering one's residence,Register one's residence and pipe is connected to some branching pipes,Outlet pipe one is provided with water pump one,And water pump one is arranged between Storage water tank and elevated flume,Outlet pipe two is connected to pond away from one end of Storage water tank,Lukewarm water boiler it is provided with between Storage water tank and pond、Warm water cooling generator and fridge,And Lukewarm water boiler、Warm water cooling generator、Fridge is arranged between Storage water tank and pond,Lukewarm water boiler is arranged between Storage water tank and warm water cooling generator,Warm water cooling generator is arranged between Lukewarm water boiler and fridge,Fridge is arranged between warm water cooling generator and pond,Lukewarm water boiler、Warm water cooling generator and fridge all connect with outlet pipe two,Outlet pipe two is provided with water pump two,Water pump two is arranged between Storage water tank and Lukewarm water boiler,Fridge is connected to cooling tower,Cooling tube and recovery tube it is provided with between fridge and cooling tower,And the two ends of cooling tube are connected with fridge and cooling tower respectively,The two ends of recovery tube are connected with fridge and cooling tower respectively,Pond is arranged below circulation pipe,Circulation pipe is provided with drainage screen,And drainage screen is completely covered the cross section of circulation pipe,The two ends of circulation pipe are all connected with pond,Outer wall at main water inlet tube、The outer wall of outlet pipe one、The outer wall of outlet pipe two、The outer wall of cooling tube and the outer wall of circulation pipe are all sheathed with apparatus for eliminating sludge.
Described apparatus for eliminating sludge includes some groups of group of magnets, often the distance between group group of magnets is equal, group of magnets is structure in the form of a ring, and internal diameter size is equivalently-sized with the outer diameter tube needing elimination incrustation scale, often group group of magnets is constituted by a shielding strip and some blocks of Magnet, often the Magnet in group group of magnets is each along needing the centrage eliminating the pipeline of incrustation scale to be uniformly fixed on the outer wall of pipeline, Magnet is arranged between shielding strip and pipeline, corresponding shielding strip is fixed in this group group of magnets on all Magnet, and every shielding strip joins end to end structure in the form of a ring.
Magnet quantity in described often group group of magnets is six pieces, and six blocks of Magnet are along needing the centrage eliminating the pipeline of incrustation scale to be uniformly fixed on the outer wall of pipeline.
The outer wall of the described pipeline needing elimination incrustation scale is sheathed with installing tache, group of magnets is arranged between installing tache, and the outer wall of installing tache is provided with mounting bar, and mounting bar is vertically fixed on the outer wall of installing tache, and installing tache and mounting bar are overall structure, mounting bar is provided with waist-shaped hole.
Being provided with intake gauge on described main water inlet tube, the apparatus for eliminating sludge being arranged on main water inlet tube outer wall is arranged between intake gauge and Storage water tank.
In sum, the beneficial effects of the utility model are: this system utilizes magnetization principle, incrustation scale in pipeline can be eliminated, making pipeline can keep unimpeded, the efficiency of water delivery is high, and improves the activity of water, use also safer, solve in existing aqueduct and can condense incrustation scale after long-time use, cause line clogging, the problem affecting the emptying effectiveness of pipeline.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of apparatus for eliminating sludge.
Labelling and corresponding parts title in accompanying drawing: 1 intake gauge;2 apparatus for eliminating sludge;3 water pumps one;4 outlet pipes one;5 elevated flumes;6 register one's residence pipe;7 branching pipes;8 Lukewarm water boilers;9 warm water cooling generators;10 fridges;11 cooling tubes;12 cooling towers;13 outlet pipes two;14 ponds;15 circulation pipes;16 drainage screens;17 recovery tubes;18 water pumps two;19 Storage water tanks;20 main water inlet tubes;21 installing taches;22 shielding strips;23 pipelines;24 Magnet;25 waist-shaped holes 25;26 mounting bars.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited only to this.
Embodiment:
nullSuch as Fig. 1、Shown in Fig. 2,A kind of can eliminate the installation system of incrustation scale in pipeline,Including main water inlet tube 20,Described main water inlet tube 20 is connected to Storage water tank 19,Storage water tank 19 is connected to outlet pipe 1 and outlet pipe 2 13,Outlet pipe 1 is connected to elevated flume 5 away from one end of Storage water tank 19,Elevated flume 5 is connected to pipe 6 of registering one's residence,Register one's residence and pipe 6 is connected to some branching pipes 7,Outlet pipe 1 is provided with water pump 1,And water pump 1 is arranged between Storage water tank 19 and elevated flume 5,Outlet pipe 2 13 is connected to pond 14 away from one end of Storage water tank 19,Lukewarm water boiler 8 it is provided with between Storage water tank 19 and pond 14、Warm water cooling generator 9 and fridge 10,And Lukewarm water boiler 8、Warm water cooling generator 9、Fridge 10 is arranged between Storage water tank 19 and pond 14,Lukewarm water boiler 8 is arranged between Storage water tank 19 and warm water cooling generator 9,Warm water cooling generator 9 is arranged between Lukewarm water boiler 8 and fridge 10,Fridge 10 is arranged between warm water cooling generator 9 and pond 14,Lukewarm water boiler 8、Warm water cooling generator 9 and fridge 10 all connect with outlet pipe 2 13,Outlet pipe 2 13 is provided with water pump 2 18,Water pump 2 18 is arranged between Storage water tank 19 and Lukewarm water boiler 8,Fridge 10 is connected to cooling tower 12,Cooling tube 11 and recovery tube 17 it is provided with between fridge 10 and cooling tower 12,And the two ends of cooling tube 11 are connected with fridge 10 and cooling tower 12 respectively,The two ends of recovery tube 17 are connected with fridge 10 and cooling tower 12 respectively,Pond 14 is arranged below circulation pipe 15,Circulation pipe 15 is provided with drainage screen 16,And drainage screen 16 is completely covered the cross section of circulation pipe 15,The two ends of circulation pipe 15 are all connected with pond 14,Outer wall at main water inlet tube 20、The outer wall of outlet pipe 1、The outer wall of outlet pipe 2 13、The outer wall of cooling tube 11 and the outer wall of circulation pipe 15 are all sheathed with apparatus for eliminating sludge 2;Described apparatus for eliminating sludge 2 includes some groups of group of magnets, often the distance between group group of magnets is equal, group of magnets is structure in the form of a ring, and internal diameter size is identical with needing pipeline 23 outside dimension eliminating incrustation scale, often group group of magnets is constituted by a shielding strip 22 and some blocks of Magnet 24, often the Magnet 24 in group group of magnets is each along needing the centrage eliminating the pipeline 23 of incrustation scale to be uniformly fixed on the outer wall of pipeline 23, Magnet 24 is arranged between shielding strip 22 and pipeline 23, corresponding shielding strip 22 is fixed in this group group of magnets on all Magnet 24, and every shielding strip 22 joins end to end structure in the form of a ring;Magnet 24 quantity in described often group group of magnets is six pieces, and six blocks of Magnet 24 are along needing the centrage eliminating the pipeline 23 of incrustation scale to be uniformly fixed on the outer wall of pipeline 23;The outer wall of the described pipeline 23 needing elimination incrustation scale is sheathed with installing tache 21, group of magnets is arranged between installing tache 21, the outer wall of installing tache 21 is provided with mounting bar 26, mounting bar 26 is vertically fixed on the outer wall of installing tache 21, and installing tache 21 is overall structure with mounting bar 26, mounting bar 26 is provided with waist-shaped hole 25;Being provided with intake gauge 1 on described main water inlet tube 20, the apparatus for eliminating sludge 2 being arranged on main water inlet tube 20 outer wall is arranged between intake gauge 1 and Storage water tank 19.Native system mainly removes the incrustation scale in pipeline, water is passed at main water inlet tube 20, water is entered in Storage water tank 19 as storing, then pass through water pump water delivery to the position needed, outlet pipe 1 is to deliver water in building, then deliver to respectively in resident family, outlet pipe 2 13 is the heating that water passes through Lukewarm water boiler 8, the cooling of warm water cooling generator 9 and the cooling of fridge 10, it is controlled in conjunction with being specifically actually needed water temperature, fridge 10 plays heat exchange action, cooling tower 12 realizes circulation, drainage screen 16 is to be filtered by the water in pond 14, prevent impurity blocking pipeline.Natural water inherently has clean, infiltration, dissolves, purifies 4 kinds of abilities, but, due to the vicious cycle that water quality deterioration-drug treating-self-purification capacity reduces, cause that the vigor that water has originally is substantially reduced.Through water delivery of being everlasting in the water pipe of daily water delivery, As time goes on, water pipe starts attachment accumulation incrustation scale, thus can cause the breeding of Chishui, antibacterial.Domestic water and industrial water are general all with negative charge, have after be combineding with each other to be formed in the feature, particularly hot water supply system of block, be dissolved in the calcium carbonate in water heated after dehydration, it is attached to inner-walls of duct and is connected into core bulk, accelerate the generation process of incrustation scale.After apparatus for eliminating sludge is installed by this programme, by in hot water supply system, utilize the magnetic of Magnet 24, the electric charge making water is changed to positive by negative, just create the process contrary with forming incrustation scale, namely the water of crystallization of the crystallization of calcium carbonate increases, and crystallization is dissolved in the water gradually, the H that additionally it can regulate easily and metal reacts+And OHBalance, it is suppressed that the corrosion of metal tube, moreover it is possible to the algae of slag particle will be formed and antibacterial removes so that pipeline can keep unimpeded, and the efficiency of water delivery is high, and improves the activity of water, uses also safer.Shielding strip 22 is to be shielded towards the magnetic of one end of pipeline external by Magnet 24, it is to avoid cause neighbouring changes of magnetic field, and the magnetic of parts or biology near impact, by magnetic control in the scope needed.
Installing tache 21 is to be fixed as by pipeline 23 and other positions, after pipeline 23 adds apparatus for eliminating sludge 2, himself gravity increases, center of gravity also produces change, it is thus desirable to increase installing tache 21 and mounting bar 26 are fixed, bolt realizes fixing through waist-shaped hole 25, so that install more firm.
It is installed on the supply pipe of fuel, due to the effect of magnetic force, it is possible to reduce the meaningless discharge of these block aggregations, reach better combustion efficiency.The oxygen contained in air is very sensitive to magnetic field, in general, oxygen is diatomic structure in its natural state, be in steady statue, install apparatus for eliminating sludge 2 on air intake duct, then oxygen decomposes, come to life, efficiency of combustion improves more, thus while improving the performance of combustion furnace and electromotor, raising combustion rate, additionally it is possible to reduce the meaningless discharge of carbon monoxide and unburned fuel.Also having for the value of magnetic flux and specify to greatest extent, the density maxima of magnetic flux must not exceed 2000 Gausses, and it uses temperature to control below 100 DEG C, as long as water or fuel can flow in the duct, just can play a role after installing this device.
The above; it it is only preferred embodiment of the present utility model; not this utility model is done any pro forma restriction, every substantially above example is made according to technology of the present utility model, method any simple modification, equivalent variations, each fall within protection domain of the present utility model.

Claims (5)

  1. null1. one kind can eliminate the installation system of incrustation scale in pipeline,It is characterized in that: include main water inlet tube (20),Described main water inlet tube (20) is connected to Storage water tank (19),Storage water tank (19) is connected to outlet pipe one (4) and outlet pipe two (13),Outlet pipe one (4) is connected to elevated flume (5) away from one end of Storage water tank (19),Elevated flume (5) is connected to pipe (6) of registering one's residence,Register one's residence and pipe (6) is connected to some branching pipes (7),Outlet pipe one (4) is provided with water pump one (3),And water pump one (3) is arranged between Storage water tank (19) and elevated flume (5),Outlet pipe two (13) is connected to pond (14) away from one end of Storage water tank (19),Lukewarm water boiler (8) it is provided with between Storage water tank (19) and pond (14)、Warm water cooling generator (9) and fridge (10),And Lukewarm water boiler (8)、Warm water cooling generator (9)、Fridge (10) is arranged between Storage water tank (19) and pond (14),Lukewarm water boiler (8) is arranged between Storage water tank (19) and warm water cooling generator (9),Warm water cooling generator (9) is arranged between Lukewarm water boiler (8) and fridge (10),Fridge (10) is arranged between warm water cooling generator (9) and pond (14),Lukewarm water boiler (8)、Warm water cooling generator (9) and fridge (10) all connect with outlet pipe two (13),Outlet pipe two (13) is provided with water pump two (18),Water pump two (18) is arranged between Storage water tank (19) and Lukewarm water boiler (8),Fridge (10) is connected to cooling tower (12),Cooling tube (11) and recovery tube (17) it is provided with between fridge (10) and cooling tower (12),And the two ends of cooling tube (11) are connected with fridge (10) and cooling tower (12) respectively,The two ends of recovery tube (17) are connected with fridge (10) and cooling tower (12) respectively,Pond (14) is arranged below circulation pipe (15),Circulation pipe (15) is provided with drainage screen (16),And drainage screen (16) is completely covered the cross section of circulation pipe (15),The two ends of circulation pipe (15) are all connected with pond (14),Outer wall in main water inlet tube (20)、The outer wall of outlet pipe one (4)、The outer wall of outlet pipe two (13)、The outer wall of cooling tube (11) and the outer wall of circulation pipe (15) are all sheathed with apparatus for eliminating sludge (2).
  2. 2. according to claim 1 a kind of can eliminate the installation system of incrustation scale in pipeline, it is characterized in that: described apparatus for eliminating sludge (2) includes some groups of group of magnets, often the distance between group group of magnets is equal, group of magnets is structure in the form of a ring, and internal diameter size is identical with needing pipeline (23) outside dimension eliminating incrustation scale, often group group of magnets is constituted by a shielding strip (22) and some pieces of Magnet (24), often the Magnet (24) in group group of magnets is each along needing the centrage eliminating the pipeline (23) of incrustation scale to be uniformly fixed on the outer wall of pipeline (23), Magnet (24) is arranged between shielding strip (22) and pipeline (23), corresponding shielding strip (22) is fixed in this group group of magnets on all Magnet (24), and every shielding strip (22) joins end to end structure in the form of a ring.
  3. 3. according to claim 2 a kind of can eliminate the installation system of incrustation scale in pipeline, it is characterized in that: Magnet (24) quantity in described often group group of magnets is six pieces, six pieces of Magnet (24) are along needing the centrage eliminating the pipeline (23) of incrustation scale to be uniformly fixed on the outer wall of pipeline (23).
  4. 4. according to claim 2 a kind of can eliminate the installation system of incrustation scale in pipeline, it is characterized in that: the outer wall of the described pipeline (23) needing elimination incrustation scale is sheathed with installing tache (21), group of magnets is arranged between installing tache (21), the outer wall of installing tache (21) is provided with mounting bar (26), mounting bar (26) is vertically fixed on the outer wall of installing tache (21), and installing tache (21) and mounting bar (26) are in overall structure, and mounting bar (26) is provided with waist-shaped hole (25).
  5. 5. according to claim 1 a kind of can eliminate the installation system of incrustation scale in pipeline, it is characterized in that: be provided with intake gauge (1) on described main water inlet tube (20), the apparatus for eliminating sludge (2) being arranged on main water inlet tube (20) outer wall is arranged between intake gauge (1) and Storage water tank (19).
CN201620075414.5U 2016-01-27 2016-01-27 Can eliminate installing the system of incrustation scale in pipeline Expired - Fee Related CN205383390U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620075414.5U CN205383390U (en) 2016-01-27 2016-01-27 Can eliminate installing the system of incrustation scale in pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620075414.5U CN205383390U (en) 2016-01-27 2016-01-27 Can eliminate installing the system of incrustation scale in pipeline

Publications (1)

Publication Number Publication Date
CN205383390U true CN205383390U (en) 2016-07-13

Family

ID=56348015

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620075414.5U Expired - Fee Related CN205383390U (en) 2016-01-27 2016-01-27 Can eliminate installing the system of incrustation scale in pipeline

Country Status (1)

Country Link
CN (1) CN205383390U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108626515A (en) * 2017-03-23 2018-10-09 何巨堂 A kind of pressurization of material containing solid-liquid reciprocating pump charging anti-solid depositing system of concetrated pipe
CN116336399A (en) * 2023-05-29 2023-06-27 益通天然气股份有限公司 Safety warning device for unloading liquefied natural gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108626515A (en) * 2017-03-23 2018-10-09 何巨堂 A kind of pressurization of material containing solid-liquid reciprocating pump charging anti-solid depositing system of concetrated pipe
CN116336399A (en) * 2023-05-29 2023-06-27 益通天然气股份有限公司 Safety warning device for unloading liquefied natural gas

Similar Documents

Publication Publication Date Title
Dobersek et al. An experimentally evaluated magnetic device's efficiency for water-scale reduction on electric heaters
CN205383390U (en) Can eliminate installing the system of incrustation scale in pipeline
CN104406303A (en) Gas water heater descaling device and descaling method thereof
CN107367057B (en) Water heater
CN201381240Y (en) Built-in magnetic water processor
CN202625937U (en) Composite quantum energy scale-borer
CN201764841U (en) Scale preventing and removing structure of closed cooling tower
CN202161850U (en) Circulating water bypass filtering system
CN202643386U (en) Strong magnetized circulating water processing apparatus
CN104724774A (en) Water purifier
CN204854373U (en) Cotton smelting pot waste heat reutilization system of glass
CN106641566A (en) Installing part based on clearing away limescale in deep-buried pipelines of furniture factory
CN201387158Y (en) Electric variable frequency antiscale solar energy water heater
CN108253663A (en) A kind of coastal waters sandy beach applied to sea water source heat pump is percolated water fetching device
CN107416996A (en) Waste water reclaiming device with automatic cleaning function
CN206583334U (en) A kind of heat exchanger reclaimed for breading sea cucumber seedlings waste water residual heat and its system
CN207347288U (en) One kind softening water treatment facilities
CN207766822U (en) Device is transformed to a kind of agricultural salt alkali
CN202885248U (en) Air source heat pump heating pressure water tank with magnetization magnesium rod
CN2928828Y (en) Magnetic anti-scale descaling device
CN202304586U (en) Cleaning system of surface air cooler of air conditioner in cigarette production environment
CN205376503U (en) Water -cooling circulating device
CN206113707U (en) Multistage waste water recovery system
CN206970319U (en) A kind of temporary hardness boiler feed water corrosion-mitigation scale-inhibition water treatment system
CN205278671U (en) Rust -resistant scale control ware of heating installation pipeline

Legal Events

Date Code Title Description
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: 20160713

Termination date: 20200127

CF01 Termination of patent right due to non-payment of annual fee