CN2802377Y - Quickly hot-water discharging device of solar water heater - Google Patents

Quickly hot-water discharging device of solar water heater Download PDF

Info

Publication number
CN2802377Y
CN2802377Y CNU2005200731569U CN200520073156U CN2802377Y CN 2802377 Y CN2802377 Y CN 2802377Y CN U2005200731569 U CNU2005200731569 U CN U2005200731569U CN 200520073156 U CN200520073156 U CN 200520073156U CN 2802377 Y CN2802377 Y CN 2802377Y
Authority
CN
China
Prior art keywords
water
valve
water inlet
outlet
pipe
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
CNU2005200731569U
Other languages
Chinese (zh)
Inventor
马新贵
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to CNU2005200731569U priority Critical patent/CN2802377Y/en
Application granted granted Critical
Publication of CN2802377Y publication Critical patent/CN2802377Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

The utility model relates to a rapid hot-water discharge device of a solar water heater, which belongs to a water supply device of the solar water heater. The utility model is characterized in that a water inlet branch pipe and a water outlet branch pipe are respectively arranged on a water in-and-out common pipe arranged on the bottom of a water tank; water inlet electromagnetic fast valve and a water outlet electromagnetic fast valve which are composed of water in-and-out traction magnets, water in-and-out valves, chains, chain wheels and return springs are respectively arranged on the water inlet branch pipe and the water outlet branch pipe; one end of a water inlet valve is provided with a main water inlet pipe; the upper end of the main water inlet pipe is provided with an automatic water inlet machine which is composed of a water tank, a float, a holding rod, an upper contact point rod and a lower contact point rod; the other end of the water outlet valve is provided with a vertical water outlet pipe with an exhaust pipe; the water in-and-out fast valves take corresponding actions along with the closure and cutting off of a power supply to enable the running water to automatically enter and automatically being closed, thereby, the running water does not have the trouble of flowing and overflowing. Along with air exhaust of the exhaust pipe, the utility model realizes that no cold water is discharged in the water outlet pipe and hot water can be obtained in few seconds. The utility model has the advantages of safe use, convenient operation and water resource saving.

Description

Solar water-heater quick whole-exhausting water-heating apparatus
Technical field
The utility model belongs to solar thermal collector, especially relates to a kind of water supply installation of solar water heater.
Background technology
Existing solar water heater, shared one of inlet tube and outlet tube, during last water, after water is full of water tank, down drop down by overflow pipe, when the user sees that water drops down out, just close water inlet switch, forgotten about closing water inlet switch in case the people gos out, running water will drop down from overflow pipe in large quantities, not only wasted water in vain, even can overflow indoor by water; In addition, prior solar water heater, especially to winter, hot water comes slowly, when you want hot water, to bleed off the cold water that stockpiles in the water inlet pipe earlier, stay in the user of skyscraper bottom, must emit the cold water that accumulates in several meters to the tens meters long pipes, just can use hot water, bleed off a large amount of cold water, the water of waste is more, also loses time.
Summary of the invention
The purpose of this utility model provides a kind of solar water-heater quick whole-exhausting water-heating apparatus, when being full of, water in water tank can close water inlet pipe automatically, running water does not have the worry of spill waste, when using hot water, need not emit the cold water in the water pipe, not waste cold water, use hot water again at once, easy to use, the conserve water resource.
The purpose of this utility model is achieved like this: a kind of solar water-heater quick whole-exhausting water-heating apparatus, form by water tank, it is characterized in that advancing of communicating with water tank cavity being installed in the bottom opening of water tank, the shared pipe of water outlet, the water inlet arm that communicates is with it installed in hypomere perforate at this shared pipe, end at this shared pipe is installed the exit branch that communicates with it, on the water inlet arm, be installed into the fast valve of water power magnetic, the fast valve of this water inlet electromagnetism is by water intaking valve, the water inlet drawing magnetism, chain, sprocket wheel, return spring and location suspension bracket are formed, water intaking valve is connected in series with the water inlet arm, the fast valve of water outlet electromagnetism is installed on exit branch, the fast valve of this water outlet electromagnetism is by outlet valve, the water outlet drawing magnetism, chain, sprocket wheel, return spring and location suspension bracket are formed, outlet valve is connected in series with exit branch, on the output shaft of the valve core of water intaking valve and outlet valve, sprocket wheel is installed all, the other end at the water intaking valve of water inlet electromagnetism fast valve is connected and installed vertical main water inlet tube, water inlet switch and be connected in the hypomere installation room of this main water inlet tube with the tap water supply pipe, the epimere of this main water inlet tube and outdoor automatic loading water device are connected, this outdoor automatic loading water device is packed on the support of water tank, outdoor automatic loading water device is by water pot, float, pressure pin, upper contact bar and lower contact bar are formed, water pot is packed on the support of water tank, the bottom opening and the main water inlet tube of water pot are connected, float is arranged in the inner chamber of water pot and with the height of the water level of water pot and lifting, the lower contact bar that the top of float is provided with pressure pin and is hinged with pressure pin, periphery at water pot is installed contact bar with clip, lower contact on upper contact on the upper contact bar and the lower contact bar disconnects along with the lifting of float or contacts; In addition, the other end at the outlet valve of the fast valve of water outlet electromagnetism is connected and installed vertical outlet pipe, vertical outlet pipe leads to indoor, its indoor lower end section is installed effluent switch and is used hot water for the user, the uniform installation athwartship leg of perforate on vertical outlet pipe, the other end of each athwartship leg is connected and installed a vertical blast pipe, and the opening of the upper end section of this vertical blast pipe is higher than the water level in the water tank, and hot water can be not excessive during exhaust; In addition, be positioned at the top of water intaking valve and outlet valve, respectively with corresponding water inlet drawing magnetism and the water outlet drawing magnetism installed of fixed support plate, the T shape armature of this water inlet drawing magnetism and water outlet drawing magnetism can oscilaltion, armature is connected with the location suspension bracket with yoke, freely come off so as not to armature, return spring is installed to connect chain in the bottom of yoke one side, chain respectively with water intaking valve, the corresponding engagement of sprocket wheel on the valve core output shaft of outlet valve, then, the other end of chain is connected the bottom of armature again, the water inlet drawing magnetism is along with on the outdoor automatic loading water device, the contact of lower contact or disconnection, switch on or off power supply, during power connection, the work of water inlet drawing magnetism, armature is risen by the yoke adhesive, conduction chain drives the sprocket wheel rotation, water intaking valve is opened, water flows in the water inlet arm, when dump, the water inlet drawing magnetism is not worked, armature descends, under the effect of return spring, chain drives the sprocket wheel counter-rotating and resets and cut out water intaking valve, water inlet automatic cut out, and the fast valve of water outlet electromagnetism switching on or off along with power supply equally, outlet valve is opened or closed, realize the supply or the cutout of hot water, feed the fast valve of water power magnetic respectively and the fast valve of water outlet electromagnetism has been installed corresponding circuit for this reason, the fast valve of water inlet electromagnetism and on, be installed into the water power source switch on the corresponding circuit that connects between the lower contact, on the circuit of the fast valve of water outlet electromagnetism, be connected and installed the water outlet power switch, and water inlet fast valve of electromagnetism and the shared zero line of the fast valve of water outlet electromagnetism; In giving the water tank of solar water heater during water-filling, the indoor water inlet power switch as long as close, open indoor running water water inlet switch, on this moment, lower contact is in the state of closing that touches, the fast valve of water inlet electromagnetism is connected power supply and is worked, water intaking valve is opened, running water charges into from main water inlet tube in the water tank continuously, and when the water level in water tank rose, running water also rose and enters the epimere of main water inlet tube, when the water in the water tank puts in place, running water enters the water pot from the epimere of main water inlet tube, holds up float, and float holds in the palm again and rises pressure pin, make lower contact bar deflection displacement, upper contact and lower contact separate, dump, and the fast valve of water inlet electromagnetism has cut out main water inlet tube automatically, just realize the worry of the automatic loading water and the no running water trickling spill of cold water, reached the purpose of not wasting water; When needs are used hot water, the indoor water outlet power switch as long as close, close into water power switch, open indoor hot water effluent's switch, the fast valve of water outlet electromagnetism is connected power supply and is worked, open outlet valve, and this moment, water intaking valve was in closed condition, outlet valve is open-minded, hot water in the water tank is descending through vertical outlet pipe, when hot water is descending, air in the vertical outlet pipe pushed from athwartship leg in the vertical blast pipe efflux, there is not air-resistance phenomenon in the vertical outlet pipe, hot water can very promptly flow out from indoor hot water effluent's switch, when stopping using hot water, as long as turn off the water outlet power switch earlier, after cutting off the electricity supply, the fast valve of water outlet electromagnetism is not worked, same under the effect of return spring, outlet valve is closed automatically, and a small amount of hot water flows to end from effluent switch in the vertical outlet pipe, turns off effluent switch again, has only air in the vertical outlet pipe, in vertical outlet pipe do not have cooled water discharge when using hot water next time, and one connects power supply, just can obtain hot water in several seconds, realize that acquisition hot water rapidly and the purpose of not wasting water.
The solar water-heater quick whole-exhausting water-heating apparatus that the utility model proposed is rational in infrastructure, and is safe and reliable, and conserve water resource, indoor nothing are dropped down the casual worry of slime flux, can also very promptly obtain hot water.
Now the solar water-heater quick whole-exhausting water-heating apparatus of in conjunction with the accompanying drawings and embodiments the utility model being carried is further described.
Description of drawings
Fig. 1 is that the master of the solar water-heater quick whole-exhausting water-heating apparatus that proposes of the utility model looks schematic diagram.
Fig. 2 is the enlarged diagram of part 19,21 among Fig. 1.
Among Fig. 1: 1, vertical outlet pipe 2, athwartship leg 3, vertical blast pipe 4, exit branch 5, outlet valve 6, water outlet drawing magnetism 7, main water inlet tube 8, clip 9, support 10, water pot 11, float 12, upper contact bar 13, upper contact 14, lower contact 15, lower contact bar 16, pressure pin 17, water tank 18, shared pipe 19, water inlet drawing magnetism 20, water inlet arm 21, water intaking valve 22, water inlet switch 23, effluent switch 29, water inlet power switch 30, water outlet power switch 31, zero line
Among Fig. 2: 24, armature 25, yoke 26, return spring 27, sprocket wheel 28, chain 32, fixed support plate
The specific embodiment
From Fig. 1, among Fig. 2 as can be seen: a kind of solar water-heater quick whole-exhausting water-heating apparatus, form by water tank 17, it is characterized in that installing and advancing that water tank 17 inner chambers communicate in the bottom opening of water tank 17, the shared pipe 18 of water outlet, the water inlet arm 20 that communicates is with it installed in hypomere perforate at this shared pipe 18, end at this shared pipe 18 is installed the exit branch 4 that communicates with it, on water inlet arm 20, be installed into the fast valve of water power magnetic, the fast valve of this water inlet electromagnetism is by water intaking valve 21, water inlet drawing magnetism 19, chain 28, sprocket wheel 27, return spring 26 and location suspension bracket are formed, water intaking valve 21 and water inlet arm 20 serial connections, the fast valve of water outlet electromagnetism is installed on exit branch 4, the fast valve of this water outlet electromagnetism is by outlet valve 5, water outlet drawing magnetism 6, chain 28, sprocket wheel 27, return spring 26 and location suspension bracket are formed, outlet valve 5 and exit branch 4 serial connections, on the output shaft of the valve core of water intaking valve 21 and outlet valve 5, sprocket wheel 27 is installed respectively, right-hand member at water intaking valve 21 is connected and installed vertical main water inlet tube 7, water inlet switch 22 and be connected in the hypomere installation room of this main water inlet tube 7 with the tap water supply pipe, the epimere of this main water inlet tube 7 and outdoor automatic loading water device are connected, this outdoor automatic loading water device is packed on the support 9 of water tank 17, outdoor automatic loading water device is by water pot 10, float 11, pressure pin 16, upper contact bar 12 and lower contact bar 15 are formed, water pot 10 is packed on the support 9 of water tank 17, the bottom opening of water pot 10 and main water inlet tube 7 are connected, float 11 is arranged in the inner chamber of water pot 10 and with the height of the water level of water pot 10 and lifting, the lower contact bar 15 that the top of float 11 is provided with pressure pin 16 and is hinged with pressure pin 16, periphery at water pot 10 is installed contact bar 12 with clip 8, the lower contact of installing on the upper contact of installing on the upper contact bar 12 13 and the lower contact bar 15 14 disconnects along with the lifting of float 11 or contacts; In addition, right-hand member at outlet valve 5 is connected and installed vertical outlet pipe 1, vertical outlet pipe 1 leads to indoor, its indoor lower end section is installed effluent switch 23 and is used hot water for the user, the uniform installation athwartship leg 2 of perforate on vertical outlet pipe 1, the right-hand member of each athwartship leg 2 is connected and installed a vertical blast pipe 3, and the opening of the upper end section of this vertical blast pipe 3 is higher than the water level in the water tank 17, and hot water can be not excessive during exhaust; In addition, be positioned at the top of water intaking valve 21 and outlet valve 5, to using fixed support plate 32 water inlet drawing magnetism 19 and water outlet drawing magnetism 6 are installed respectively, the armature 24 of this water inlet drawing magnetism 19 and water outlet drawing magnetism 6 can more than, following lifting, connect with location suspension bracket (not drawing among the figure) between armature 24 and the yoke 25, freely come off so as not to armature 24, return spring 26 all is installed to connect chain 28 in the bottom in yoke 25 left sides, chain 28 respectively with water intaking valve 21, sprocket wheel 27 corresponding engagements on the valve core output shaft of outlet valve 5, then, the right-hand member of chain 28 is connected the bottom of armature 24 again, water inlet drawing magnetism 19 is along with on the outdoor automatic loading water device, lower contact 13,14 contact or disconnection, switch on or off power supply, during power connection, 19 work of water inlet drawing magnetism, armature 24 rises after by yoke 25 adhesives, conduction chain 28 drives sprocket wheel 27 rotations, water intaking valve 21 is opened, water flows in water inlet arm 20, when dump, water inlet drawing magnetism 19 is not worked, armature 24 descends, under the effect of return spring 26,27 counter-rotatings of chain 28 drive sprocket wheels reset and close water intaking valve 21, the water inlet automatic cut out, and the fast valve of water outlet electromagnetism switching on or off along with power supply equally, outlet valve 5 is opened or closed, realize the supply or the cutout of hot water, feed the fast valve of water power magnetic respectively and the fast valve of water outlet electromagnetism has been installed corresponding circuit for this reason, water inlet electromagnetism fast valve and on, lower contact 13, be installed into water power source switch 29 on the corresponding circuit that connects between 14, on the circuit of the fast valve of water outlet electromagnetism, be connected and installed water outlet power switch 30, and water inlet fast valve of electromagnetism and the shared zero line 31 of the fast valve of water outlet electromagnetism; In giving the water tank 17 of solar water heater during water-filling, the indoor water inlet power switch 29 as long as close, open indoor running water water inlet switch 22, on this moment, lower contact 13,14 are in the state of closing that touches, the fast valve of water inlet electromagnetism is connected power supply and is worked, water intaking valve 21 is opened, running water charges in the water tank 17 from main water inlet tube 7 continuously, when the water level in water tank 17 rises, running water also rises and enters the epimere of main water inlet tube 7, when the water in the water tank 17 puts in place, running water enters the water pot 10 from the epimere of main water inlet tube 7, holds up float 11, and float 11 holds in the palm again and rises pressure pin 16, make lower contact bar 15 deflections displacement, upper contact 13 and lower contact 14 separate, dump, and the fast valve of water inlet electromagnetism has cut out main water inlet tube 7 automatically, just realize the worry of the automatic loading water and the no running water trickling spill of cold water, reached the purpose of not wasting water; When needs are used hot water, the indoor water outlet power switch 30 as long as close, close into water power switch 29, open indoor hot water effluent's switch 23, the fast valve of water outlet electromagnetism is connected power supply and is worked, open outlet valve 5, and this moment, water intaking valve 21 was in closed condition, outlet valve 5 is open-minded, hot water in the water tank 17 is descending through vertical outlet pipe 1, when hot water is descending, air in the vertical outlet pipe 1 pushed from athwartship leg 2 in the vertical blast pipe 3 efflux, there is not air-resistance phenomenon in the vertical outlet pipe 1, hot water can very promptly flow out from indoor hot water effluent's switch 23, when stopping using hot water, as long as turn off water outlet power switch 30 earlier, after cutting off the electricity supply, the fast valve of water outlet electromagnetism is not worked, same under the effect of return spring 26, outlet valve 5 is closed automatically, and a small amount of hot water flows to end from effluent switch 23 in the vertical outlet pipe 1, turns off effluent switch 23 again, has only air in the vertical outlet pipe 1, in vertical outlet pipe 1 do not have cooled water discharge when using hot water next time, and one connects power supply, just can obtain hot water in several seconds, realize that acquisition hot water rapidly and the purpose of not wasting water.

Claims (1)

1, a kind of solar water-heater quick whole-exhausting water-heating apparatus is made up of water tank (17), it is characterized in that:
A, bottom opening at water tank (17) is installed and advancing that water tank (17) inner chamber communicates, the shared pipe (18) of water outlet, the water inlet arm (20) that communicates is with it installed in hypomere perforate at this shared pipe (18), end at this shared pipe (18) is installed the exit branch (4) that communicates with it, on water inlet arm (20), be installed into the fast valve of water power magnetic, the fast valve of this water inlet electromagnetism is by water intaking valve (21), water inlet drawing magnetism (19), chain (28), sprocket wheel (27), return spring (26) and location suspension bracket are formed, water intaking valve (21) and water inlet arm (20) serial connection, go up the fast valve of installation water outlet electromagnetism at exit branch (4), the fast valve of this water outlet electromagnetism is by outlet valve (5), water outlet drawing magnetism (6), chain (28), sprocket wheel (27), return spring (26) and location suspension bracket are formed; Outlet valve (5) and exit branch (4) serial connection is installed sprocket wheel (27) respectively on the output shaft of the valve core of water intaking valve (21) and outlet valve (5);
B, right-hand member at water intaking valve (21) is connected and installed vertical main water inlet tube (7), water inlet switch (22) in the hypomere installation room of this main water inlet tube (7), epimere of this main water inlet tube (7) and outdoor automatic loading water device are connected, this outdoor automatic loading water device is packed on the support (9) of water tank (17), outdoor automatic loading water device is by water pot (10), float (11), pressure pin (16), upper contact bar (12) and lower contact bar (15) are formed, water pot (10) is packed on the support (9) of water tank (17), the bottom opening of water pot (10) and main water inlet tube (7) are connected, float (11) is arranged in the inner chamber of water pot (10), the lower contact bar (15) that the top of float (11) is provided with pressure pin (16) and is hinged with pressure pin (16), periphery at water pot (10) is installed contact bar (12) with clip (8), install contact (13) on the upper contact bar (12), lower contact bar (15) is gone up lower contact (14) is installed;
C, be connected and installed vertical outlet pipe (1) at the right-hand member of outlet valve (5), its indoor lower end section is installed effluent switch (23), go up the uniform installation athwartship leg of perforate (2) at vertical outlet pipe (1), the right-hand member of each athwartship leg (2) is connected and installed a vertical blast pipe (3), and the opening of the upper end section of this vertical blast pipe (3) is higher than the water level in the water tank (17);
D, be positioned at the top of water intaking valve (21) and outlet valve (5), to using fixed support plate (32) water inlet drawing magnetism (19) and water outlet drawing magnetism (6) are installed respectively, connect with the location suspension bracket between the armature (24) of this water inlet drawing magnetism (19) and water outlet drawing magnetism (6) and the yoke (25), return spring (26) all is installed to connect chain (28) in the bottom in yoke (25) left side, chain (28) respectively with water intaking valve (21), the corresponding engagement of sprocket wheel (27) on the valve core output shaft of outlet valve (5), the right-hand member of chain (28) is connected the bottom of armature (24) again.
CNU2005200731569U 2005-06-30 2005-06-30 Quickly hot-water discharging device of solar water heater Expired - Fee Related CN2802377Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2005200731569U CN2802377Y (en) 2005-06-30 2005-06-30 Quickly hot-water discharging device of solar water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2005200731569U CN2802377Y (en) 2005-06-30 2005-06-30 Quickly hot-water discharging device of solar water heater

Publications (1)

Publication Number Publication Date
CN2802377Y true CN2802377Y (en) 2006-08-02

Family

ID=36847087

Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2005200731569U Expired - Fee Related CN2802377Y (en) 2005-06-30 2005-06-30 Quickly hot-water discharging device of solar water heater

Country Status (1)

Country Link
CN (1) CN2802377Y (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245003A (en) * 2013-04-25 2013-08-14 苏州市伦琴工业设计有限公司 Hot water saving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245003A (en) * 2013-04-25 2013-08-14 苏州市伦琴工业设计有限公司 Hot water saving system

Similar Documents

Publication Publication Date Title
CN202195617U (en) Water-saving device of solar water heater
CN2847171Y (en) Intelligent inner circulation emptying anti-freezing device for solar energy heat collector and pipeline fall difference
CN2802377Y (en) Quickly hot-water discharging device of solar water heater
CN1892148A (en) Solar water-heater quick whole-exhausting water-heating apparatus
CN201836512U (en) Self-closing water feeding valve of solar water heater
CN2886438Y (en) Water supply and drain device without seeper, cold drainage and frost in water pipe for solar water heater
CN203405006U (en) Solar water heater drainage anti-freezing device
CN102620431A (en) Water saving device applicable to various water heaters
CN2624125Y (en) Efficient constant temperature solar water heater
CN201819442U (en) Energy-saving water return device of solar hot water system capable of improving solar energy utilization rate
CN203100257U (en) Automatic control device for water feeding and draining of solar water heater
CN2527896Y (en) High property drainage valve for solar water heater
CN202630488U (en) Emptying valve for in-built siphon-type pipeline of solar water heater
CN201599950U (en) Electric auxiliary heating system of solar water heater
CN209569915U (en) Automatic loading water formula solar water heater
CN102679598A (en) Internal siphon pipeline evacuation valve of solar water heater
CN2533358Y (en) Hydraulic drain valve for solar water heater
CN201740277U (en) Energy-saving lever solenoid valve solar water-saving device
CN202220883U (en) Water mixing valve device
CN202648219U (en) Novel split type lifting emptying antifreezing non-return device with built-in pipe nozzle
CN203550205U (en) Integral air source heat pump hot water unit
CN201983501U (en) Heat pump water tank with water return device
CN2903615Y (en) Mechanical water-level controller
CN201311110Y (en) Water-saving solar water heater
CN207095058U (en) A kind of hot water supply system of multi-energy complementation structure

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