CN2937917Y - Power frequency electromagnet heating boiler - Google Patents
Power frequency electromagnet heating boiler Download PDFInfo
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- CN2937917Y CN2937917Y CN 200620097181 CN200620097181U CN2937917Y CN 2937917 Y CN2937917 Y CN 2937917Y CN 200620097181 CN200620097181 CN 200620097181 CN 200620097181 U CN200620097181 U CN 200620097181U CN 2937917 Y CN2937917 Y CN 2937917Y
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- shaped heating
- boiler
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Abstract
The utility model relates to a water boiler, in particular to an industrial frequency electromagnetic heating water boiler, which is characterized in that one end of a first U- shaped heating water pipe (18) is connected with the outlet pipe of a cooling water tank (22); the middle segment of the first U -shaped heating water pipe (18) passes through a first induction coil (19). The other end of the first U -shaped heating water pipe is connected with a second U- shaped heating water pipe (34) by an elbow, and the middle segment of the second U- shaped heating water pipe (34) passes through the second induction coil (12). The elbow is connected with a third U -shaped heating water pipe (35) at the other end of the second U- shaped heating water pipe (34), and the middle segment of the third U -shaped heating water pipe (35) passes through the third induction coil (15). The other end of the third U -shaped heating water pipe (35) is communicated with a hot water inlet pipe (13); the hot water outlet pipe is communicated with a hot water tank (6). A nozzle made (21) is arranged on the hot water outlet pipe, and the nozzle made (21) is arranged at the outside of a furnace body (9). The utility model is characterized by high heating efficiency and fast water exit.
Description
Technical field
The utility model relates to a kind of boiler, is used for supplying water on constituent parts and the passenger train.
Background technology
The kind of existing boiler is more, and as electrothermal tube heating boiler, the efficiency of heating surface is low, it is slow to go out water speed.
Summary of the invention
The purpose of this utility model is to provide a kind of efficiency of heating surface height, the fireballing power frequency electromagnetism heating of water outlet boiler.
To achieve these goals, the technical solution of the utility model is: power frequency electromagnetism heating boiler, it comprises entering water electromagnetic valve 2, hot water full-water level probe 3, hot water low level probe 4, cold water inlet pipe 5, boiler 6, body of heater 9, second induction coil 12, hot water inlet pipe (being pipe to boil water) 13, the 3rd induction coil 15, first induction coil 19, first U-shaped heating pipe 18, faucet 21, cold water storage cistern 22, cold water low level probe 23, cold water full-water level probe 24, second U-shaped heating pipe 34, the 3rd U-shaped heating pipe 35, control circuit, in the body of heater 9 is cavity, the dividing plate 20 of body of heater 9 is separated into water tank chamber 29 and eddy-current heating chamber 10 with cavity, boiler 6, cold water storage cistern 22 lays respectively in the water tank chamber 29 and with body of heater 9 fixedlys connected, be provided with hot water full-water level probe 3 in the boiler 6, hot water low level probe 4, be provided with cold water low level probe 23 in the cold water storage cistern 22, cold water full-water level probe 24, cold water inlet pipe 5 is connected with cold water storage cistern 22, cold water inlet pipe 5 is provided with entering water electromagnetic valve 2, first U-shaped heating pipe's 18 a end links to each other with the outlet pipe of cold water storage cistern 22, first U-shaped heating pipe 18 interlude passes first induction coil 19, the other end links to each other with second U-shaped heating pipe 34 by elbow, second U-shaped heating pipe's 34 interlude passes second induction coil 12, second U-shaped heating pipe's 34 the other end is linked to each other with the 3rd U-shaped heating pipe 35 by elbow, the 3rd U-shaped heating pipe's 35 interlude passes the 3rd induction coil 15, the 3rd U-shaped heating pipe's 35 the other end is connected with hot water inlet pipe (being pipe to boil water) 13, first induction coil 19, second induction coil 12, the 3rd induction coil 15 links to each other with control circuit respectively, the upper end of hot water inlet pipe (being pipe to boil water) 13 is positioned at boiler 6, the port of the upper end of hot water inlet pipe (being pipe to boil water) 13 is higher than the position of cold water full-water level probe 24, the hot water outlet pipe is connected with boiler 6, the hot water outlet pipe is provided with faucet 21, and faucet 21 is positioned at outside the body of heater 9.
Linked to each other by elbow and loose joint between 3 U-shaped heating pipes and between first U-shaped heating pipe 18 and the cold water storage cistern outlet pipe, hog ring hot water inlet pipe (being pipe to boil water) 13 welds.
Boiler 6 connects a humidification pipe 27, and humidification pipe 27 is provided with humidification air valve 26.
Control circuit comprises main control circuit, three-phase current detection circuit, power electronic switching circuit, and control circuit links to each other with power frequency supply, and three-phase current detection circuit, power electronic switching circuit link to each other with the single-chip microcomputer of main control circuit respectively; Main control circuit comprises frequency generator, button, warning circuit, the anti-deadlock module of single-chip microcomputer, LED display, measurement water level, LED display 1,2,3,4 pin not and single- chip microcomputer 18,16,17,15 pin are connected, 8 pin of frequency generator are connected with 21 pin of single-chip microcomputer, button is connected with 14 pin of single-chip microcomputer, and warning circuit is connected with single-chip microcomputer 22 pin, and anti-deadlock module is connected with single-chip microcomputer 1 pin.
The beneficial effects of the utility model are: adopt first induction coil 19, second induction coil 12, the 3rd induction coil 15 are set respectively on 3 U-shaped heating pipes, water in the U-shaped heating pipe is heated, its adopts power frequency electromagnetic heating technique (adopting the heating of UVW phase induction heater), the safe flames of anger and efficiency of heating surface height (exceeding more than 25% than the electrothermal tube heating), goes out water speed fast (can go out boiling water in a minute).Boiler 6 connects a humidification pipe 27, and the steam during heating is given indoor increase humidity, has humidification function.
Description of drawings
Fig. 1 is an external view of the present utility model
Fig. 2 is a structural representation of the present utility model
Fig. 3 is the left view in eddy-current heating chamber among Fig. 2
Fig. 4 is the vertical view in eddy-current heating chamber among Fig. 2
Fig. 5 is a control circuit block diagram of the present utility model
Fig. 6 is the main control circuit schematic diagram of the utility model control circuit
Fig. 7 is the electronic switching circuit schematic diagram of the utility model control circuit
Fig. 8 is the current detection circuit schematic diagram of the utility model control circuit
Fig. 9 is the structural representation of the utility model UVW phase induction heater
Figure 10 is the utility model electrode level frequency detection circuit schematic diagram
Among the figure: the 1-Y-valve of intaking, 2-entering water electromagnetic valve, 3-hot water full-water level probe, 4-hot water low level probe, 5-cold water inlet pipe, 6-boiler, 7-hot water draining valve, 8-lack of water probe, 9-body of heater, 10-eddy-current heating chamber, 11-second temperature sensor, 12-second induction coil, 13-hot water inlet pipe (being pipe to boil water), 14-blowoff valve, 15-the 3rd induction coil, the 16-three-temperature sensor, 17-first temperature sensor, 19-first induction coil, first U-shaped heating pipe of 18-, 20-dividing plate, 21-faucet, the 22-cold water storage cistern, 23-cold water low level probe, 24-cold water full-water level probe, the 25-gap, 26-humidification air valve, 27-humidification pipe, the 28-control cabinet, 29-water tank chamber, 30-water tank door, 31-water tank door lock, 32-eddy-current heating chamber door, 33-eddy-current heating chamber door lock, second U-shaped heating pipe of 34-, the 3rd U-shaped heating pipe of 35-.
The specific embodiment
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, power frequency electromagnetism heating boiler, it comprises into water Y-valve 1, entering water electromagnetic valve 2, hot water full-water level probe 3, hot water low level probe 4, cold water inlet pipe 5, boiler 6, hot water draining valve 7, lack of water probe 8, body of heater 9, second temperature sensor 11, second induction coil 12, hot water inlet pipe (being pipe to boil water) 13, blowoff valve 14, the 3rd induction coil 15, three-temperature sensor 16, first temperature sensor 17, first induction coil 19, first U-shaped heating pipe 18, faucet 21, cold water storage cistern 22, cold water low level probe 23, cold water full-water level probe 24, humidification air valve 26, humidification pipe 27, control cabinet 28, water tank door 30, eddy-current heating chamber door 32, second U-shaped heating pipe 34, the 3rd U-shaped heating pipe 35, in the body of heater 9 is cavity, the dividing plate 20 of body of heater 9 is separated into water tank chamber 29 and eddy-current heating chamber 10 with cavity, the hinged water tank door 30 in 29 places, water tank chamber of body of heater 9, water tank door 30 is provided with water tank door lock 31, the hinged eddy-current heating chamber door 32 in 10 places, eddy-current heating chamber of body of heater 9, eddy-current heating chamber door 32 is provided with eddy-current heating chamber door lock 33; Boiler 6, cold water storage cistern 22 lay respectively in the water tank chamber 29 and with body of heater 9 fixedly connected (being connected) by screw, be provided with hot water full-water level probe 3 in the boiler 6, hot water low level probe 4, be provided with cold water low level probe 23 in the cold water storage cistern 22, cold water full-water level probe 24, hot water full-water level probe 3, hot water low level probe 4, cold water low level probe 23, the output of cold water full-water level probe 24 respectively with frequency generator (the contact A of the measurement water level of control circuit, B, C, D, E) link to each other, cold water inlet pipe 5 is connected with cold water storage cistern 22, cold water inlet pipe 5 is provided with entering water electromagnetic valve 2, water inlet Y-valve 1 (water inlet Y-valve 1 is positioned at the behind of body of heater 9), entering water electromagnetic valve 2 links to each other with the single-chip microcomputer of control circuit; First U-shaped heating pipe's 18 a end links to each other with the outlet pipe of cold water storage cistern 22, and interlude passes first induction coil 19, and the other end links to each other with second U-shaped heating pipe 34 by elbow; Second U-shaped heating pipe's 34 interlude passes second induction coil 12, and the other end is linked to each other with the 3rd U-shaped heating pipe 35 by elbow; The 3rd U-shaped heating pipe's 35 interlude passes the 3rd induction coil 15, the other end is connected with hot water inlet pipe (being pipe to boil water) 13, first induction coil 19, second induction coil 12, the 3rd induction coil 15 links to each other with the electronic switching circuit of control circuit respectively, three U-shaped heating pipes link to each other by the elbow of boxing on hot water inlet pipe (being pipe to boil water) 13 respectively, first induction coil 19,12 one-tenth 90 ° of layouts of the 3rd induction coil 15 and second induction coil, hot water inlet pipe (being pipe to boil water) 13 is connected with boiler 6, the bottom of hot water inlet pipe (being pipe to boil water) 13 is provided with blowoff valve 14, the upper end of hot water inlet pipe (being pipe to boil water) 13 is provided with lack of water probe 8, frequency generator (the contact F of the measurement water level of lack of water probe 8 and control circuit, E) link to each other; Be respectively equipped with first temperature sensor 17, second temperature sensor 11, three-temperature sensor 16 on three U-shaped heating pipes (18,34,35), the upper end of hot water inlet pipe (being pipe to boil water) 13 is positioned at boiler 6, the port of the upper end of hot water inlet pipe (being pipe to boil water) 13 is higher than the position (hot water outlet pipe is connected with boiler 6) of cold water full-water level probe 24, the hot water outlet pipe is provided with faucet 21, faucet 21 is positioned at outside the body of heater 9, the hot water outlet pipe is provided with hot water draining valve 7, and the gap 25 of cold water storage cistern 22 is connected with overflow pipe.Control cabinet 28 is fixed on the upper end of body of heater 9, and control circuit is positioned at control cabinet 28, and the display location of control circuit is on the casing of control cabinet 28.Hot water full-water level probe 3, hot water low level probe 4, lack of water probe 8, cold water low level probe 23, cold water full-water level probe 24 adopt level sensor respectively.Humidification pipe 27 is connected with boiler 6, and humidification pipe 27 is provided with humidification air valve 26.Whole heater block all adopts fire proofing encapsulation wrapping.
As shown in Figure 5, control circuit comprises main control circuit, three-phase current detection circuit, power electronic switching circuit, and control circuit links to each other with power frequency supply, and three-phase current detection circuit, power electronic switching circuit link to each other with the single-chip microcomputer of main control circuit respectively; Control cabinet adopts stainless steel plug, socket with outside the connection, has prevented the corrosion phenomena that water vapour causes, and has made easy accessibility reliable.
As shown in Figure 6, main control circuit comprises single-chip microcomputer (central processing unit), LED display (LED dot matrix screen), the frequency generator (electrode conversion) of measuring water level, button, warning circuit, anti-deadlock module, LED display 1,2,3,4 pin not and single- chip microcomputer 18,16,17,15 pin are connected, and 8 pin of frequency generator are connected with 21 pin of single-chip microcomputer, and button is connected with 14 pin of single-chip microcomputer, warning circuit is connected with single-chip microcomputer 22 pin, and anti-deadlock module is connected with single-chip microcomputer 1 pin.
As shown in Figure 7, electronic switching circuit comprises isolated drive circuit, contactless electronic beam switch and contact switch, and by the Single-chip Controlling isolated drive circuit, isolated drive circuit is controlled the contactless electronic beam switch circuit again, and electronic switch is connected with contact switch.
As shown in Figure 8, current detection circuit comprises current sensor and current signal treatment circuit, and current sensor is sampled to alternating current, delivers to the current signal treatment circuit then and amplifies processing.
As shown in Figure 9, UVW phase induction heater (being the line-frequency induction heater) is made of the metal tube of former limit induction coil, secondary that (among the figure: first induction coil 19 is former limit, and first U-shaped heating pipe 18 is secondary; Second induction coil 12 is former limit, and second U-shaped heating pipe 34 is secondary; The 3rd induction coil 15 is former limit, and the 3rd U-shaped heating pipe 35 is secondary); The line-frequency induction heating principle: when former limit winding is connected power frequency supply, induction produces Short-Circuit High Current and is heated in the metal tube of secondary, then heat is conducted to liquid; See Japan Patent: JP37536/89.
As shown in figure 10, the electrode level frequency detection circuit comprises oscillating circuit and multidiameter option switch, and oscillating circuit is connected with variable connector.
Normal mode of operation:
1, cold water route via: outer tank, cold water inlet pipe 5, entering water electromagnetic valve 2, cold water storage cistern 22, three U-shaped heating pipes (18,34,35),
2, hot water route via: three U-shaped heating pipes (18,34,35), hot water inlet pipe (being pipe to boil water) 13, boiler 6, outlet pipe, faucet 21.
After the energising, detect earlier the water level of cold water storage cistern 22, if anhydrous, then open entering water electromagnetic valve 2, cold water externally under the hydraulic pressure of water tank, enters cold water storage cistern 22, fills until cold water storage cistern 22.When water level reaches the water level of setting, electronic switch is connected, start heating, after cold water in three U-shaped heating pipes (18,34,35) burns boiling, the pressure of water increases, the water of boiling has been pressed, and seethes boiler 6 by hot water inlet pipe (being pipe to boil water) 13, burns full side up to boiler 6 and stops heating.In the process of heating up water, cold water storage cistern 22 water levels will descend, and when reducing to setting value, entering water electromagnetic valve 2 is opened, and cold water enters cold water storage cistern 22 until last full.When boiler 6 water levels dropped to setting value, heating can start again, so goes round and begins again hot water without interruption.
In the work, display screen will show the duty of drinking water boiler.
Process fault detection:
1, phase shortage and over-current detection: when power electronic switching is connected, carry out current detecting, when three-phase current exceeds normal scope, boiler will quit work, and the alarm fault.
2, solenoid valve failure: in the water inlet process, magnetic valve is detected, if magnetic valve open circuit, short circuit or act on badly, boiler will quit work, and the alarm fault.
3, level electrode fault: when electric pole short circuit, open circuit or act on when bad, boiler will quit work, and the alarm fault.
The novel device that the utility model is developed according to the principle of energy savings and energy recycling: it adopts the power frequency electromagnetic heating technique a., adopt UVW phase induction heater heating (being the line-frequency induction heating), the safe flames of anger and efficiency of heating surface height (exceeding more than 25%) than electrothermal tube heating, go out water speed fast (can go out boiling water in a minute), overload capacity is strong, improve service life, low of heater greatly, the magnetization drinking water with health-care efficacy can be provided electrical equipment, network interferences; Attaching has humidification function.B. having adopted electrode level frequency detecting technology (is frequency generator, exactly the height of water level is converted to the height of frequency), the general electrode type fluviograph electrode of flowing through all is a DC current, the employing analog circuit detects, though it is simple in structure, but level electrode is easy to fouling and has polluted the water source under effect of electric field, influence the electric conductivity of electrode, detect when causing easily to, the time detect fault less than water level; What apply is the low frequency alternating current of μ A level to the utility model to electrode (hot water full-water level probe 3, hot water low level probe 4, lack of water probe 8, cold water low level probe 23, cold water full-water level probe 24), and adopt to be interrupted and give electrifying electrodes, shortened the time of electrifying electrodes; Then water level signal is carried out digitlization conversion, send single-chip microcomputer to handle, eliminated the problem that analog signal is subject to disturb the erroneous judgement that causes with fouling fully, when farthest reducing fouling, also have the characteristics that are easy to overhaul simple and reliable for structure.C. electric control box (control cabinet 28) has Chinese demonstration and major failure prompt facility, very easily safeguards.
The utility model characteristic of property:
1, the steam in the time of can utilizing the power frequency electromagnet heating boiler heating is given indoor increase humidity.
2, this power frequency electromagnet heating boiler is more energy-conservation more than 25% than electric heating pipe type electric water-boiling device.
3, one minute can the output boiling water, consider that the water storage tank cold conditions splits the coolant-temperature gage impact, got final product drinking water in about 3 minutes.
4, the output boiling water is magnetized drinking water, after hydrone is magnetized by high-intensity magnetic field, changed underwater gold belong to calcium, magnesium ion and acid group from Polymerization trend between son has suppressed the adhesive force of suspended particulates on heating surface, greatly reduces the formation of incrustation scale; Simultaneously by Be polar molecule in hydrone, water is after magnetization, and the quantity of unimolecule water increases greatly, and its activity is better than other molecule greatly, Thereby magnetized drinking water has the effect of the treatment such as sterilization, sterilization, treatment calculus chronic diseases, plays medical care effect.
5, scale removal is easy, as long as open its underpart blowoff valve 14 in the eddy-current heating chamber 10, the iron wire introducing can be removed dirt. Boiler 6, cold water storage cistern 22 only need be pulled down 4 screws and just can make things convenient for scale removal to clean.
6, safe, whole heater block all adopts fire proofing encapsulation wrapping, does not produce naked light.
7, control section adopts " Single-chip Controlling+anti-deadlock technology ", the generation of stopping to crash automatically. In the LED dot matrix screen Literary composition shows duty and the fault of boiler. Very comprehensively defencive function is arranged: phase shortage, undercurrent, overcurrent, water intaking valve are opened Road, water intaking valve short circuit, lack of water, electrode open circuit or short circuit, cold water cavity high water level, heating chamber lack of water or low water level, heating chamber Overheated etc.
Because water quality differs bigger, the electrode scale problems of sensed water level is very serious, and electrode is the critical component that ensures the boiler operate as normal, in case electrode failure will make power frequency electromagnetism heating boiler cisco unity malfunction, even has the danger of catching fire.Several water level detecting modes of at present existing boiler are easy to occur the electrode fouling, and the water level control section of this power frequency electromagnetism heating boiler has adopted the frequency detecting technology, can farthest reduce fouling, also have the characteristics that are easy to overhaul simple and reliable for structure simultaneously.Control cabinet can be bad etc. with Chinese character display Name and position with above fault and electrode insulation, and maintenance person is come into plain view.
When long-time no cold water, the magnetic valve discontinuous operation has prolonged the magnetic valve life-span; Heat driven has increased " contactless electronic beam switch+relay " duplicate protection, has eliminated the spark interference, has avoided that the contact is bonding to cause the boiler dry combustion method, has strengthened load circuit trouble free service protectiveness.
8, real hot and cold water is separated by heat-insulation layer, even if entering water electromagnetic valve is not closed completely, cold water can not enter boiler yet, the common fault that has very easily entered boiler when having eliminated at present drinking water boiler cold water full water mostly.Make it to drink real boiling water.
9, control cabinet adopts stainless steel plug, socket with outside the connection, has prevented the corrosion phenomena that water vapour causes, and has made easy accessibility reliable.
Claims (3)
1. the power frequency electromagnetism heats boiler, it is characterized in that: it comprises entering water electromagnetic valve (2), hot water full-water level probe (3), hot water low level probe (4), cold water inlet pipe (5), boiler (6), body of heater (9), second induction coil (12), hot water inlet pipe (13), the 3rd induction coil (15), first induction coil (19), first U-shaped heating pipe (18), faucet (21), cold water storage cistern (22), cold water low level probe (23), cold water full-water level probe (24), second U-shaped heating pipe (34), the 3rd U-shaped heating pipe (35), control circuit, in the body of heater (9) is cavity, the dividing plate (20) of body of heater (9) is separated into water tank chamber (29) and eddy-current heating chamber (10) with cavity, boiler (6), cold water storage cistern (22) lays respectively in the water tank chamber (29) and with body of heater (9) fixedlys connected, be provided with hot water full-water level probe (3) in the boiler (6), hot water low level probe (4), be provided with cold water low level probe (23) in the cold water storage cistern (22), cold water full-water level probe (24), cold water inlet pipe (5) is connected with cold water storage cistern (22), cold water inlet pipe (5) is provided with entering water electromagnetic valve (2), first U-shaped heating pipe's (18) a end links to each other with the outlet pipe of cold water storage cistern (22), first U-shaped heating pipe (18) interlude passes first induction coil (19), the other end links to each other with second U-shaped heating pipe (34) by elbow, second U-shaped heating pipe's (34) interlude passes second induction coil (12), second U-shaped heating pipe's (34) the other end is linked to each other with the 3rd U-shaped heating pipe (35) by elbow, the 3rd U-shaped heating pipe's (35) interlude passes the 3rd induction coil (15), the 3rd U-shaped heating pipe's (35) the other end is connected with hot water inlet pipe (13), first induction coil (19), second induction coil (12), the 3rd induction coil (15) links to each other with control circuit respectively, the upper end of hot water inlet pipe (13) is positioned at boiler (6), the port of the upper end of hot water inlet pipe (13) is higher than the position of cold water full-water level probe (24), the hot water outlet pipe is connected with boiler (6), the hot water outlet pipe is provided with faucet (21), and faucet (21) is positioned at outside the body of heater (9).
2. power frequency electromagnetism heating boiler according to claim 1, it is characterized in that: first induction coil (19), the 3rd induction coil (15) become 90 ° of layouts with second induction coil (12).
3. power frequency electromagnetism heating boiler according to claim 1, it is characterized in that: boiler (6) connects a humidification pipe (27), and humidification pipe (27) is provided with humidification air valve (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620097181 CN2937917Y (en) | 2006-06-13 | 2006-06-13 | Power frequency electromagnet heating boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620097181 CN2937917Y (en) | 2006-06-13 | 2006-06-13 | Power frequency electromagnet heating boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2937917Y true CN2937917Y (en) | 2007-08-22 |
Family
ID=38361946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620097181 Expired - Fee Related CN2937917Y (en) | 2006-06-13 | 2006-06-13 | Power frequency electromagnet heating boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2937917Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538207A (en) * | 2011-09-18 | 2012-07-04 | 牟敦善 | Tandem type electromagnetic heater |
-
2006
- 2006-06-13 CN CN 200620097181 patent/CN2937917Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538207A (en) * | 2011-09-18 | 2012-07-04 | 牟敦善 | Tandem type electromagnetic heater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |