CN213711980U - Temperature control valve and energy-saving water heater hot water circulation system comprising same - Google Patents
Temperature control valve and energy-saving water heater hot water circulation system comprising same Download PDFInfo
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- CN213711980U CN213711980U CN202021795943.5U CN202021795943U CN213711980U CN 213711980 U CN213711980 U CN 213711980U CN 202021795943 U CN202021795943 U CN 202021795943U CN 213711980 U CN213711980 U CN 213711980U
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- control valve
- temperature control
- water
- valve
- temperature
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 213
- 238000007789 sealing Methods 0.000 claims description 15
- 210000004722 stifle Anatomy 0.000 claims 3
- 238000003287 bathing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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Abstract
A temp-control valve and the hot water circulating system of energy-saving water heater are disclosed. The temperature control valve is provided with a hot water cavity, a cold water cavity, a temperature control valve temperature sensing bag cavity and a mixed water cavity, water flow forms a circulating channel from the hot water cavity → the temperature control valve temperature sensing bag cavity → the cold water cavity, the temperature control valve temperature sensing bag cavity detects water temperature to control the connection or the blockage of the hot water cavity and the cold water cavity, and when the blockage occurs, the circulating pump is controlled to stop through the water flow switch and give an alarm to prompt a user. The system can replace the original bathing water mixing valve with the circulation stop temperature control valve without damaging the original bathroom cold and hot water preset pipelines, realizes point-to-point local hot water pipeline preheating circulation from a water point to a water heater, does not need to carry out hot water whole-circle or half-circle preheating circulation, does not have a preheating blind area due to branching, saves energy and water, and is applied to a two-pipe structure without a return pipe.
Description
Technical Field
The utility model discloses valve and water heater technical field, concretely relates to temperature-sensing valve and contain energy-conserving water-saving water heater hot water circulating system of this temperature-sensing valve.
Background
In the prior art, for a hot water circulation system of a cold-hot two-pipe water heater without a hot water return pipe, a one-way property functional valve is generally installed at a water consumption point which is farthest away from the water heater, so that a hot water pipeline is communicated with a cold water pipeline. Water flows from the hot water pipe to the cold water pipe, and temperature signals are sampled on the circulating pipeline, so that hot water full-circle preheating circulation from a hot water outlet of the water heater to a cold water inlet of the water heater or hot water half-circle preheating circulation from a hot water outlet of the water heater to a farthest water using point is realized. However, when a user takes hot water from a water taking point closer to the water heater, the hot water is wasted wastefully because the hot water needs to be preheated for a whole circle, and in addition, the branch pipeline has a preheating blind area, so more energy is wasted after the hot water is accumulated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a temperature-sensing valve and contain energy-conserving water-saving water heater hot water circulation system of this temperature-sensing valve realizes between water heater and the water consumption hot water line local preheating circulation, needn't carry out hot water whole circle or half a circle preheating circulation when getting hot water near the water consumption point of water heater to can not have the preheating blind area because of the branch.
At least one embodiment of the present disclosure provides a thermostatic valve including:
a hot water chamber;
a cold water chamber;
a mixed water chamber;
the temperature sensing bag cavity of the temperature control valve is communicated with the mixed water cavity;
the temperature control valve core is provided with a through hole consistent with the axis direction of the temperature control valve core, the hot water cavity is communicated with the temperature control valve temperature sensing bag cavity through a first gap between an annular sealing line at the lower end of the temperature control valve core and an annular sealing surface at the lower end of the valve seat, and the temperature control valve temperature sensing bag cavity is communicated with the cold water cavity through a second gap between the through hole and an annular sealing line at the upper end of the temperature control valve core and an annular sealing surface at the upper end of the valve seat;
the adjusting mechanism is used for adjusting the sizes of the first gap and the second gap by controlling the position of the valve core of the temperature control valve, the adjusting mechanism comprises a rotating sleeve, a first spring, a sliding block, a second spring with the elastic modulus smaller than that of the first spring, a temperature control valve temperature sensing bag, a blank cap, a top pin and a temperature control valve hand wheel, the temperature control valve hand wheel is fixedly connected with the rotating sleeve, the rotating sleeve is in threaded connection with the sliding block to form a screw rod nut mechanism, the sliding block is arranged in the rotating sleeve, the blank cap and the first spring are arranged in a cavity of the sliding block, the temperature control valve temperature sensing bag is positioned in the temperature control valve temperature sensing bag cavity, the temperature control valve temperature sensing bag and the valve core of the temperature control valve are connected into a whole, the upper end of the temperature control valve temperature sensing bag is tightly attached to the top pin, the top pin supports the blank cap, one end of the second spring is supported on the inner step of the temperature control valve temperature sensing bag cavity, the other end of the second spring abuts against the valve core of the temperature control valve, a clamp spring for preventing the first spring from ejecting the blank cap is arranged on the sliding block, a bushing is arranged between the valve core of the temperature control valve and the blank cap, and the ejector pin is located in the bushing.
In some examples, the first and second gaps are opened when the temperature of water in the thermostatic bulb chamber is below a threshold and the thermostatic handwheel is rotated to a first position.
In some examples, the first gap and the second gap are greater than 0.25 mm.
In some examples, the first gap is closed when the temperature of water in the thermostatic bulb reaches a threshold value and the thermostatic handwheel is in the first position.
In some examples, the temperature of water within the thermostatic bulb chamber reaches a threshold value, and rotation of the thermostatic handwheel to a second position opens the first gap and closes the second gap.
In some examples, the inlet of the hot water chamber has a hot water quick-open valve, the inlet of the cold water chamber has a cold water quick-open valve, and the outlet of the mixed water chamber has a mixed water quick-open valve.
At least one embodiment of the present disclosure provides a hot water circulation system of a water heater, comprising the thermostat valve disposed at a water consumption point.
In some examples, an alarm system is included that emits an alarm message when the first gap is closed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below.
Fig. 1 is a partial sectional view of a front view of a temperature control valve according to one embodiment of the present disclosure.
Fig. 2 is a sectional view in the direction a-a of the temperature control valve shown in fig. 1.
Fig. 3 is a sectional view in the direction B-B of the temperature control valve shown in fig. 1.
FIG. 4 is a schematic view of a hot water circulation system of an energy and water saving water heater according to one embodiment of the present disclosure.
Fig. 5 is a circuit diagram of an alarm system according to one embodiment of the present disclosure.
Description of reference numerals: 100-water heater, 101-circulating water pump, 102-hot water triangular valve, 103-circulating water mixing valve, 104-single temperature control stop valve group, 105-cold water triangular valve, 106-cold water pipeline, 107-hot water pipeline, 108-filter, 109-temperature control valve, 110-water flow switch, 300-power supply, 301-contactor KM normally open contact KM _1, 302-intermediate relay KA normally open contact, 303-time delay disconnection contact of time relay KT, 304-water flow switch contact, 305-contactor KM normally closed contact KM _2, 306-circulating water pump motor, 307-time relay KT coil, 308-contactor KM coil, 309-intermediate relay KA coil, 310-buzzer BU, 1-hot water joint, 2-valve body spherical joint, 3-valve body, 4-sealing ring, 5-through hole, 6-hot water inlet, 7-hot water inlet filter screen, 8-hot water quick-opening valve, 9-hot water quick-opening valve outlet, 10-hot water cavity, 11-cold water cavity, 12-cold water quick-opening valve, 13-cold water quick-opening valve outlet, 14-cold water inlet filter screen, 15-cold water inlet, 16-cold water joint, 17-rotary sleeve, 18-large rigid spring, 19-sliding block, 20-temperature control valve core, 21-small rigid spring, 22-temperature control valve temperature sensing bag, 23-blank cap, 24-knock pin, 25-bushing, 26-mixed water cavity, 27-mixed water cavity quick-opening valve, 28-mixed water cavity quick-opening valve inlet, 29-mixed water outlet, 30-mixed water outlet joint, 31-temperature control valve temperature sensing bag cavity, 32-temperature control valve hand wheel, 33-temperature control bathing position (second position), 34-hot water quick opening valve inlet, 35-preheating circulating position (first position), 36-reference point (fixed mark on valve), 37-annular sealing line at lower end of valve core of temperature control valve, 38-annular sealing surface at lower end of valve seat, 39-cold water quick opening valve inlet, 40-annular sealing line at upper end of valve core of temperature control valve, 41-second gap, 42-annular sealing surface at upper end of valve seat, 43-first gap.
Detailed Description
As shown in fig. 1 and 2, a thermo-valve spool 20 of the thermo-valve 109 and a seal ring 4 thereof partition a straight-through chamber formed in a valve body 3 into a hot water chamber 10 and a cold water chamber 11. In addition, a temperature-sensing valve bag chamber 31 and a mixed water chamber 26 for mixing hot water and cold water are provided in the valve body 3, and the temperature-sensing valve bag chamber 31 is communicated with the mixed water chamber 26. The hot water inlet 6 of the hot water chamber 10 is provided with a hot water quick-opening valve 8 for controlling the flow rate, the cold water inlet 15 of the cold water chamber 11 is provided with a cold water quick-opening valve 12 for controlling the flow rate, and the mixed water outlet 29 of the mixed water chamber 26 is provided with a mixed water quick-opening valve 27 for controlling the flow rate of the mixed water. Furthermore, the hot water inlet 6, the cold water inlet 15, and the mixed water outlet 29 have fittings 1, 16, 30, respectively, connected to the respective water pipes. The hot water chamber 10 and the cold water chamber 11 can also be provided with filter screens 7 and 14 for filtering water entering the temperature control valve 109.
The thermo valve 109 includes a first spring (large rigidity spring) 18, a slider 19, a second spring (small rigidity spring) 21, a thermo-bulb 22, a blank cap 23, a knock pin 24, and the like. The thermostatic valve bulb 22 is located in the thermostatic valve bulb cavity 31. The temperature-sensing bulb 22 of the temperature-sensing valve is connected with the valve core 20 of the temperature-sensing valve into a whole, and the two can be connected through screw threads. The free end (upper end) of the temperature-sensing bulb 22 of the temperature-sensing valve is tightly attached to the ejector pin 24, the ejector pin 24 abuts against the blank cap 23, and the blank cap 23 and the first spring 18 are arranged in the cavity of the slide block 19. Furthermore, a snap spring 44 is arranged on the slide block 19 for preventing the large rigid spring 18 from ejecting the blank cap 23. One end of the small rigid spring 21 is propped against the inner step of the temperature sensing bag cavity 31 of the temperature control valve, and the other end is propped against the valve core 20 of the temperature control valve, so that the valve core 20 of the temperature control valve is pushed upwards. The large rigid spring 18 can play a role of buffering when the temperature control valve bulb 22 is heated and expanded, and can overcome the upward acting force of the small rigid spring 21 to push the temperature control valve core 20 and the temperature control valve bulb 22 to move downwards.
The thermostatic valve 109 also comprises a thermostatic valve hand wheel 32 and a rotary sleeve 17 which are fixedly connected into a whole. The rotary sleeve 17 and the slide block 19 form a screw nut mechanism, wherein the rotary sleeve 17 is provided with internal threads, and the slide block 19 sleeved in the rotary sleeve 17 is provided with external threads. When the temperature control valve hand wheel 32 is rotated, the slide block 19 can linearly move up and down, namely, the position of the temperature control valve hand wheel 32 is changed, so that the position of the temperature control valve core 20 can be adjusted.
Referring to fig. 3, a first gap 43 communicating the hot water chamber 10 and the thermo-valve temperature sensing bag chamber 31 is formed between an annular seal line 37 at the lower end of the thermo-valve spool 20 and an annular seal surface 38 at the lower end of the valve seat. A second gap 41 is provided between an annular sealing line 40 at the upper end of the thermostatic valve spool 20 and an annular sealing surface 42 at the upper end of the valve seat. The valve core 20 of the temperature control valve is provided with a plurality of through holes 5 consistent with the axial direction of the valve core, and the through holes 5 can be distributed in a ring shape. The temperature-sensing bag cavity 31 of the temperature-sensing valve is communicated with the cold water cavity 11 through the through hole 5 and the second gap 41. The sizes of the first gap 43 and the second gap 41 are controlled by the temperature control valve hand wheel 32 and the temperature of the hot water flowing into the temperature control valve temperature sensing bag cavity 31.
When the temperature of the water in the temperature sensing bag cavity 31 of the thermostatic valve is lower than the threshold value (about 33 ℃) and the hand wheel 32 of the thermostatic valve rotates to the first position 35, the first gap 43 and the second gap 41 are always kept in an open state, and in a possible embodiment, both the first gap 43 and the second gap 41 are larger than 0.25 mm. In order to ensure that the water temperature in the temperature sensing valve bag cavity 31 is lower than a threshold value (about 33 ℃) and the temperature sensing valve hand wheel 32 rotates to a first position 35, the first gap 43 and the second gap 41 are opened, the bushing 25 is arranged between the temperature sensing valve core 20 and the blank cap 23, the lower end face of the bushing 25 is tightly attached to the temperature sensing valve core 20, a gap is formed between the upper end face of the bushing 25 and the blank cap 23, the sliding block 19 moves downwards (in the direction of the temperature sensing valve core 20) in the process that the temperature sensing valve hand wheel 32 rotates to the first position 35, the axial gap between the upper end face of the bushing 25 and the blank cap 23 is eliminated, the blank cap 23 pushes the temperature sensing valve core 20 downwards while extruding the bushing 25, the small rigid spring 21 pushes the temperature sensing valve core 20 upwards, and finally the first gap 43 and the second gap 41 are opened when the water temperature in the temperature sensing valve bag cavity 31 is lower than the threshold value, and the hot water pipeline and the. Because of the function of the bush 25, the paraffin in the temperature sensing bulb 22 is not shrunk due to the lower water temperature in the temperature sensing bulb cavity 31 of the temperature control valve, the top pin 24 moves downwards, the small rigid spring 21 pushes the valve core 20 of the temperature control valve upwards to reduce or even close the second gap 41, and the circulating channel is not influenced.
When the temperature of water in the temperature sensing bag cavity 31 of the temperature control valve rises, paraffin in the temperature sensing bag 22 of the temperature control valve expands due to heating, the upper end of the temperature sensing bag 22 of the temperature control valve applies an acting force to the ejector pin 24, the force is transmitted to the large rigid spring 18 through the blank cap 23, and the elastic modulus of the large rigid spring 18 is far larger than that of the small rigid spring 21, so that the valve core 20 of the temperature control valve and the temperature sensing bag 22 of the temperature control valve move downwards under the counterforce applied by the large rigid spring 18. When the temperature of the water in the temperature sensing bag cavity 31 of the temperature control valve exceeds a threshold value (about 33 ℃), the valve core 20 of the temperature control valve moves downwards to a position where the first gap 43 is closed, and the passage between the hot water cavity 10 and the cold water cavity 11 is blocked.
When the temperature of the water in the temperature sensing bag cavity 31 of the temperature control valve reaches a threshold value (about 33 ℃), the hand wheel 32 of the temperature control valve is rotated to the second position 33, so that the first gap 43 is opened, and the second gap 41 is closed. Because the slide block 19 moves upwards (away from the direction of the valve core 20 of the temperature control valve) in the process of rotating the hand wheel 32 of the temperature control valve to the second position 33, the valve core 20 of the temperature control valve is pushed upwards by the small rigid spring 21, so that the first gap 43 is opened, and the second gap 41 is closed, at the moment, because a gap is formed between the upper end surface of the bush 25 and the blank cap 23, the temperature sensing bag cavity 31 of the temperature control valve expands with heat and contracts with cold, and the up-and-down movement of the valve core 20 of the temperature control valve cannot.
As shown in fig. 4, the temperature control valve 109 of the present disclosure is installed at a raining point, and only a local pipeline from a water heater to the raining point needs to be preheated, so that the problems that the existing hot water circulation system of the water heater needs to preheat a whole circle of pipeline from a hot water outlet of the water heater to a cold water inlet of the water heater, or needs to preheat a half circle of pipeline from the hot water outlet of the water heater to a farthest water using point, and a branch pipeline has a preheating blind area are solved. In addition, after the hot water inlet 6 and the cold water inlet 15 of the temperature control valve 109 of the present disclosure are changed into the style of the mixing valve of the prior art, the circulating mixing valve 103 and the single-phase temperature control stop valve set 104 can be replaced by other water points besides the raining point.
In addition, the hot water circulation system of the water heater also comprises an alarm system for reminding a user of completing preheating. Fig. 5 shows a circuit diagram of an alarm system, which includes a contactor KM, a time relay KT, an intermediate relay KA, and a buzzer 310, wherein a coil 307 of the time relay KT and a coil 309 of the intermediate relay KA are respectively connected to two ends of a power supply 300, a series circuit formed by a coil 308 of the contactor KM and a contact 304 of a water flow switch 110 is connected to two ends of the power supply 300, a series circuit formed by a motor 306 of a circulating water pump 101 and a normally open contact KM _ 1301 of the contactor KM is connected to two ends of the power supply 300, a series circuit formed by a time-delay disconnection contact 303 of the time relay KT and a normally open contact 302 of the intermediate relay KA is connected in parallel with the normally open contact KM _ 1301 of the contactor KM, and the buzzer 310 is connected to two ends of the power supply 300 after being connected in series. The power supply 300 may use a remote control power supply.
When hot water is needed to be taken, namely when the temperature of water in the temperature control valve temperature sensing bag cavity 31 is lower than a threshold value, the temperature control valve hand wheel 32 is rotated to the first position 35 to preheat, the power supply 300 is turned on, the motor 306 of the circulating water pump 101 runs, the contact 304 of the water flow switch 110 is conducted, the coil 308 of the contactor KM is electrified, and hot water circulates through a hot water inlet 6 → a hot water inlet 6 filter screen 7 → a hot water quick-opening valve 8 → a hot water cavity 10 → the temperature control valve temperature sensing bag cavity 31 → a cold water cavity 11 → a cold water inlet 15 filter screen 14 → a cold water quick-opening valve 12 → a cold water inlet 15'; when the temperature of water in the temperature sensing bag cavity 31 of the temperature control valve reaches a threshold value, the first gap 43 is closed to block the preheating circulation channel, the contact 304 of the water flow switch 110 is disconnected, the coil 308 of the contactor KM is powered off, the motor 306 stops running, and the buzzer BU310 is powered on to alarm to prompt a user to send hot water to a water consumption point; then, the power supply 300 is turned off, the temperature control valve hand wheel 32 is rotated to the second position 33, so that the first gap 43 is opened, hot water flows out when the mixed water quick-opening valve 27 which opens the mixed water outlet 29, and the temperature of the water flowing out of the mixed water outlet 29 can be adjusted by rotating the temperature control valve hand wheel 32 within the range of the second position 33.
When cold water is needed, the hot water quick-opening valve 8 is closed, and the temperature control valve hand wheel 32 is rotated to the first position 35.
The temperature control valve disclosed by the invention is compact in structure and convenient to install, and can replace the original bathing water mixing valve under the condition that the arrangement of the cold and hot water pipelines of the original bathroom is not changed. The local preheating circulation from the water heater to the water using point of the hot water pipeline is realized, the whole or half-circle preheating circulation of hot water is not needed, the energy is saved, and no blind area exists in the preheating process.
Claims (8)
1. A thermostatted valve, comprising:
a hot water chamber (10);
a cold water chamber (11);
a mixing water chamber (26);
the temperature sensing bag cavity (31) of the temperature control valve is communicated with the mixed water cavity (26);
the temperature control valve core (20) is provided with a through hole (5) consistent with the axial direction of the temperature control valve core, the hot water cavity (10) is communicated with the temperature control valve temperature sensing bag cavity (31) through a first gap (43) between an annular sealing line (37) at the lower end of the temperature control valve core (20) and an annular sealing surface (38) at the lower end of a valve seat, and the temperature control valve temperature sensing bag cavity (31) is communicated with the cold water cavity (11) through the through hole (5) and a second gap (41) between an annular sealing line (40) at the upper end of the temperature control valve core (20) and an annular sealing surface (42) at the upper end of; the adjusting mechanism is used for adjusting the size of a first gap (43) and a second gap (41) by controlling the position of a temperature control valve core (20), and comprises a rotating sleeve (17), a first spring (18), a sliding block (19), a second spring (21) with the elastic modulus smaller than that of the first spring (18), a temperature control valve temperature sensing bag (22), a blank cap (23), a top pin (24) and a temperature control valve hand wheel (32), wherein the temperature control valve hand wheel (32) is fixedly connected with the rotating sleeve (17), the rotating sleeve (17) and the sliding block (19) are in threaded connection to form a screw rod nut mechanism, the sliding block (19) is arranged in the rotating sleeve (17), the blank cap (23) and the first spring (18) are arranged in a cavity of the sliding block (19), the temperature control valve temperature sensing bag (22) is arranged in a temperature control valve temperature sensing bag cavity (31), the temperature control valve temperature sensing bag (22) and the temperature control valve core (20) are connected into a whole, and the temperature control valve temperature sensing bag (22) is tightly attached to the top end of the top pin (, the stifle (23) is withstood by the knock pin (24), one end of the second spring (21) is withstood on the inner step of the temperature sensing bag cavity (31) of the temperature control valve, and the other end of the second spring (21) is withstood on the valve core (20) of the temperature control valve, and the temperature sensing bag is characterized in that a snap spring (44) for preventing the stifle (23) from being jacked by the first spring (18) is arranged on the sliding block (19), a bush (25) is arranged between the valve core (20) of the temperature control valve and the stifle (23), and the knock pin (24) is positioned in the bush (.
2. The thermostat valve according to claim 1, wherein the first gap (43) and the second gap (41) are opened when the temperature of water in the thermostat valve temperature sensing bulb cavity (31) is lower than a threshold value and the thermostat valve hand wheel (32) rotates to the first position.
3. Thermostatted valve as claimed in claim 2, characterized in that the first gap (43) and the second gap (41) are greater than 0.25 mm.
4. The thermostat valve as claimed in claim 1, characterized in that the first gap (43) is closed when the temperature of the water in the thermostat valve temperature-sensing bulb (31) reaches a threshold value and the thermostat valve hand wheel (32) is in the first position.
5. The thermostatic valve according to claim 3, wherein the temperature of the water in the thermostatic valve temperature sensing bulb (31) reaches a threshold value and the first gap (43) opens and the second gap (41) closes when the thermostatic valve hand wheel (32) is rotated to the second position.
6. The thermostat valve as claimed in claim 1, characterized in that the inlet of the hot water chamber (10) has a hot water quick-opening valve (8), the inlet of the cold water chamber (11) has a cold water quick-opening valve (12), and the outlet of the mixed water chamber (26) has a mixed water quick-opening valve (27).
7. A hot water circulation system of a water heater, characterized by comprising the temperature control valve of any one of claims 1 to 6 arranged at a water using point.
8. A hot water circulation system for a water heater according to claim 7, characterized by comprising an alarm system for giving an alarm when the first gap (43) is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021795943.5U CN213711980U (en) | 2020-08-25 | 2020-08-25 | Temperature control valve and energy-saving water heater hot water circulation system comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021795943.5U CN213711980U (en) | 2020-08-25 | 2020-08-25 | Temperature control valve and energy-saving water heater hot water circulation system comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213711980U true CN213711980U (en) | 2021-07-16 |
Family
ID=76791479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021795943.5U Expired - Fee Related CN213711980U (en) | 2020-08-25 | 2020-08-25 | Temperature control valve and energy-saving water heater hot water circulation system comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213711980U (en) |
-
2020
- 2020-08-25 CN CN202021795943.5U patent/CN213711980U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20210716 |