CN114136007B - Self-cleaning method of zero-cold-water gas water heater - Google Patents
Self-cleaning method of zero-cold-water gas water heater Download PDFInfo
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- CN114136007B CN114136007B CN202111074525.6A CN202111074525A CN114136007B CN 114136007 B CN114136007 B CN 114136007B CN 202111074525 A CN202111074525 A CN 202111074525A CN 114136007 B CN114136007 B CN 114136007B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 460
- 238000004140 cleaning Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 238000009991 scouring Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 4
- 241000894006 Bacteria Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000003287 bathing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000009928 pasteurization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/0042—Cleaning arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a self-cleaning method of a zero-cold water gas water heater, which is characterized in that the heating power of the gas water heater is adjusted to enable heated hot water to circulate in a pipeline, so that the high-temperature hot water which circularly flows can sterilize stored water in the pipeline, meanwhile, the power of a water pump is adjusted to flush the pipeline by changing the internal water pressure change of the pipeline, and then a water using point at the farthest end on a water outlet pipe of the gas water heater is opened to discharge the stored water in the pipeline outwards, thereby realizing the purpose of automatically completing the self-cleaning in the pipeline.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a self-cleaning method of a zero-cold-water gas water heater.
Background
The water heater is characterized in that a zero-cold-water function is started under the condition of no boiled water, a water pump in the gas water heater is started at the moment, after the water heater is started, water in a water outlet pipeline flows out through a water outlet pipe of the water heater, the flowing water flows back to the water heater through a water return pipeline to form a circulation pipeline, after the water heater detects a water flow signal, combustion heating is started, and after 3-5 minutes, all water in the whole circulation pipeline can be heated to a set temperature.
In addition, after the tap water is used for a long time, more harmful bacteria are generated in the pipeline, especially dead water which does not flow for a long time, and a large amount of harmful bacteria exist (the proper temperature for the growth of general microorganisms is 28-37 ℃, and the sterilization effect can be achieved at more than 60 ℃). The bath outlet water temperature of the conventional gas water heater is about 42 ℃, and the flow rate of tap water is high, so that harmful bacteria in the tap water are difficult to kill.
Disclosure of Invention
The invention aims to solve one of the problems in the prior related art at least to a certain extent, and therefore the invention provides a self-cleaning method of a zero-cold-water gas water heater, which is simple and feasible and can effectively sterilize the water stored in a pipeline, thereby further improving the water quality.
The above purpose is realized by the following technical scheme:
a self-cleaning method for a zero-cold water gas water heater, the self-cleaning method comprising the steps of:
starting a water pump of the gas water heater after the gas water heater enters a self-cleaning mode;
collecting water flow in a preset time to obtain a total water flow value;
comparing the total water flow value with a preset water flow value, and controlling the gas water heater to perform ignition work according to a comparison result;
acquiring a current first backwater temperature value and a current water flow value, and calculating a water outlet temperature value when the gas water heater is heated by using the maximum preset power according to the acquired data;
adjusting the heating power of the gas water heater according to the calculated outlet water temperature value, and judging whether the calculated outlet water temperature value is smaller than a preset temperature value or not; if so, controlling the gas burner to heat by using the maximum preset power; if not, calculating the output power of the current gas water heater through a calculation formula, and controlling the gas water heater to heat by using the calculated output power;
if the current outlet water temperature reaches a preset target temperature, acquiring a plurality of return water temperature values until the acquired data meet a preset circulation condition so as to finish the first circle of water circulation work;
recording the total circulating water quantity value in the first circle of water circulation work;
reducing the heating power of the gas water heater to enable the current outlet water temperature value to reach a first preset temperature, and then stopping heating according to a preset time length;
simultaneously collecting the water flow of the current water circulation to obtain a first circulating water quantity value, and stopping the water circulation to finish the second water circulation work until the first circulating water quantity value reaches the total circulating water quantity value;
the action of the water pump is controlled to complete the circulating flushing work.
In some embodiments, the step of comparing the total water flow value with a preset water flow value and controlling the gas water heater to perform an ignition operation according to the comparison result comprises:
judging whether the total water flow value reaches a preset water flow value or not;
if so, opening a gas valve to control the gas water heater to perform ignition work;
if not, an alarm is sent to the user.
In some embodiments, the outlet water temperature value of the gas water heater when heating with the maximum preset power is obtained by the following calculation formula: t out =13 × 25/L + T in, where T out is an outlet water temperature value when the gas water heater is heated using the maximum preset power, 13 is a set value, 25 is a threshold value, L is a current water flow value, and T in is a first return water temperature value.
In some embodiments, the output power of the current gas water heater is obtained by the following calculation formula: p = (T sets-T advances) × L/14, where P is the current output power of the gas water heater, T is set as a preset temperature value, T advances is a first return water temperature value, L is a current water flow value, and 14 is a coefficient.
In some embodiments, the step of obtaining a plurality of return water temperature values when the current outlet water temperature reaches a preset target temperature until the obtained data meets a preset circulation condition to complete a first circle of water circulation work includes:
collecting the current water outlet temperature until the current water outlet temperature reaches a preset target temperature;
collecting a plurality of backwater temperature values at intervals of second preset time within first preset time;
calculating the sum of the collected return water temperature values to obtain initial return water temperature data;
acquiring current backwater temperature values at every second preset time interval continuously, correcting the backwater temperature data acquired last time according to the acquired current backwater temperature values, and after correction is carried out within third preset time or continuously for n times, summing calculation is carried out to obtain corrected backwater temperature data;
acquiring a current second backwater temperature value until the backwater temperature data after the current correction is respectively larger than each group of backwater temperature data obtained by the previous correction;
obtaining a third backwater temperature value again, and judging whether the third backwater temperature value meets a preset circulation condition or not; if yes, finishing the first circle of water circulation work; if not, returning to obtain the current backwater temperature value and comparing the current backwater temperature value with the preset circulating condition again.
In some embodiments, the preset cycle condition is that the third backwater temperature value is greater than a sum of the second backwater temperature value and the coefficient, and the backwater temperature data corrected according to the third backwater temperature value is respectively greater than each set of backwater temperature data obtained by correction before the third backwater temperature value.
In some embodiments, after the step of reducing the heating power of the gas water heater to make the current outlet water temperature value reach the first preset temperature, the step of stopping heating according to a preset time length includes:
reducing the heating power of the gas water heater to control the gas burner to heat by using the minimum preset power;
and stopping heating according to the preset time length until the current outlet water temperature value reaches the first preset temperature.
In some embodiments, the step of performing a cyclic flushing operation by controlling the action of the water pump comprises:
after the second circle of water circulation work is finished;
starting the water pump according to the maximum preset power;
reducing the power of the water pump until the current power of the water pump is increased to the maximum preset power;
increasing the power of the water pump until the current power of the water pump is reduced to the minimum preset power;
and simultaneously collecting the water flow of the current water circulation to obtain a second circulating water quantity value, and stopping the water circulation to finish the circulating flushing work until the second circulating water quantity value is more than three times of the total circulating water quantity value.
In some embodiments, the step of performing the cyclic flushing operation by controlling the operation of the water pump comprises:
after the circulation scouring work is finished;
prompting a user to open a water using point at the farthest end on a water outlet pipe of the gas water heater so as to discharge stored water in a pipeline outwards;
acquiring a current water discharge flow value;
and prompting the user that the water discharge work is finished when the water discharge flow value is larger than the total circulating water quantity value.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the self-cleaning method of the zero-cold-water gas water heater is simple and feasible, and can effectively sterilize the water stored in the pipeline, thereby further improving the water quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of a method for controlling a gas water heater according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a gas water heater with overlapping staged loads in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas water heater according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The components of embodiments of the present invention may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the technical scope of the present invention as claimed.
Example (b):
as shown in fig. 1 and 2, the present embodiment provides a self-cleaning method for a zero-cold water gas water heater, which is implemented by adjusting the heating power of the gas water heater to circulate heated hot water in a pipeline, so as to sterilize stored water in the pipeline by high-temperature hot water flowing in a circulation manner, and meanwhile, by adjusting the power of a water pump to flush the pipeline by changing the internal water pressure change of the water channel, and then opening the water-using point at the farthest end on the water outlet pipe of the gas water heater to discharge the stored water in the pipeline to the outside, thereby automatically completing the purpose of self-cleaning inside the pipeline.
As shown in fig. 3, the gas water heater in this embodiment has a water heater body 1, the water heater body 1 is connected with a water inlet valve 2 and a water outlet valve 3 respectively, the water heater body 1 is communicated with external water supply through the water inlet valve 2 so that the external water supply enters the water heater body 1 through the water inlet valve 2, hot water heated by the water heater body 1 is conveyed outwards through the water outlet valve 3, the water heater body 1 is communicated with a water outlet pipe 4 through the water outlet valve 3, the water heater body 1 is communicated with hot water outlets of a plurality of water consumption points 6 through the water outlet pipe 4, cold water outlets of the plurality of water consumption points 6 are communicated with the external water supply through a water inlet pipe 5 respectively, a first one-way valve 7 is arranged between one end far away from the external water supply and the cold water outlet of the farthest water consumption point 6, a second one-way valve 8 is arranged between the cold water outlet of the farthest water consumption point 6 and the water heater body 1, a water return pipe 9 is arranged between the cold water outlet of the farthest water consumption point 6 and the water outlet pipe 1, the first one-way valve 7 and the second one-way valve 8 are arranged on the water return pipe 9 respectively, so that a water pump 3 and a water pump for circulating scheme is formed in the water heater body 1 and the water outlet pipe 3 is started sequentially. In addition, the gas water heater can also cancel the second one-way valve 8 and the return pipe 9, so that the gas water heater forms a two-pipe scheme, and the gas water heater forms a two-pipe scheme, when the water pump in the water heater body 1 is started, water in the pipeline sequentially passes through the water outlet valve 3, the water outlet pipe 4, the second one-way valve 8, the water heater body 1 and the water outlet valve 3 to perform internal circulation.
In this embodiment, gas heater is under the condition of the boiled water not, open zero cold water function, the inside water pump of water heater can start this moment, after starting, the deposit water in the play water pipe flows, discharge through the water heater outlet pipe, the rivers that flow back to the water heater body on through the return water pipe once more, thereby form circulation pipeline, the water heater detects there is rivers signal after, open the combustor and heat in order can be with the whole heating of water of whole circulation pipeline to the set temperature, during the user's bathing, it has hot water output to open the gondola water faucet promptly, thereby can not flow out cold water earlier in order to realize zero cold water function.
As shown in fig. 2, most of the gas water heaters are constant temperature gas water heaters, and the gas water heaters with different loads have different segmentation modes, such as 2-4-6 segmentation gas water heaters, which means that 2 rows (4 rows or 6 rows) of fire can be used for heating and burning when the gas water heaters are burnt, and different rows of fire are selected for burning according to different loads, but when the gas water heaters leave a factory, 2 rows of maximum fire loads are required to be greater than 4 rows of minimum fire loads, and 4 rows of maximum fire loads are required to be greater than 6 rows of minimum fire loads, so as to ensure the continuity of the loads. FIG. 2 is a schematic diagram of a 2-4-6 sectional water heater with different sectional loads overlapped, the intake pressure is generally 2000pa, PL in the diagram is the minimum load of the minimum opening of the sectional small proportional valve, PH is the maximum load of the maximum opening of the sectional small proportional valve, and the opening of the different sectional PL and PH proportional valve are consistent, and the combustion discharge number is controlled by a solenoid valve. In addition, the 2-4 overlap region was calculated as 2PH-4pl =7-6=1kw, i.e. 23kW is equivalent to 13L/min 25 degrees, 1kW means that when the water flow rate is 1L/min, 14 degrees can be heated; the calculation procedure for the 4-6 overlap region was 4PH-6PL =13-10=3kW.
As shown in fig. 1, the self-cleaning method of the zero-cold-water gas water heater in this embodiment specifically includes the following steps:
and step S101, starting a water pump of the gas water heater after the gas water heater enters a self-cleaning mode.
In this embodiment, a user starts the self-cleaning function through the operation panel to enable the gas water heater to enter the self-cleaning mode, and since high-temperature hot water exists in the pipeline in the self-cleaning mode, the gas water heater prompts the user that bathing water cannot be used in the self-cleaning process after the gas water heater enters the self-cleaning mode.
And S102, collecting water flow in preset time to obtain a total water flow value.
And S103, comparing the total water flow value with a preset water flow value, and controlling the gas water heater to perform ignition work according to the comparison result.
In this embodiment, it is determined whether the total water flow value reaches a preset water flow value;
if so, opening a gas valve to control the gas water heater to perform ignition work;
if not, the water shortage is determined or the valve of the water path is not opened, and the alarm is given to the user.
Specifically, the preset time in this embodiment is preferably set to be 7s, 8s, or 9s, but is not limited to the above time value, and other more suitable time values may be selected according to actual requirements, and the preset time in this embodiment is described by taking 8s as an example, and other details are not described again. In this embodiment, the preset water flow value is preferably set to 2.5L/min, but is not limited to the above value, and other more suitable values may be selected according to actual requirements.
And step S104, acquiring a current first backwater temperature value and a current water flow value, and calculating a water outlet temperature value when the gas water heater is heated by using the maximum preset power according to the acquired data.
In this embodiment, if the maximum power of the gas water heater is 23kw, the outlet water temperature value when the gas water heater is heated by using the maximum preset power is obtained by the following calculation formula: t out =13 × 25/L + T in, where T out is an outlet water temperature value when the gas water heater is heated using the maximum preset power, 13 is a set value, 25 is a threshold value, L is a current water flow value, and T in is a first return water temperature value.
And step S105, adjusting the heating power of the gas water heater according to the calculated outlet water temperature value.
In this embodiment, it is determined whether the calculated effluent temperature value is less than a preset temperature value;
if so, controlling the gas burner to heat by using the maximum preset power;
if not, calculating the output power of the current gas water heater through a calculation formula, and controlling the gas water heater to heat by using the calculated output power.
Specifically, the preset temperature value in this embodiment is preferably set to 70 ℃, but is not limited to the above temperature value, and other more suitable temperature values may be selected according to actual requirements. If the calculated outlet water temperature value is greater than the preset temperature value, namely T is greater than 70 ℃, at this moment, if the gas water heater is controlled to use the maximum power for heating, the gas water heater may be overheated, so that the situation that the internal temperature is too high and the like may occur, therefore, the outlet water temperature value is limited to be not greater than 70 ℃, then when the preset temperature value is set to 70 ℃, the backstepping calculation is carried out through a calculation formula, namely the output power of the current gas water heater is obtained through the following calculation formula: p = (T sets-T advances) × L/14, where P is the output power of the current gas water heater, T is set to a preset temperature value, i.e., T is set to 70 ℃, T advances is a first return water temperature value, L is the current water flow value, and 14 is a coefficient.
And S106, if the current outlet water temperature reaches a preset target temperature, acquiring a plurality of return water temperature values until the acquired data meet preset circulation conditions so as to finish the first circle of water circulation work, and simultaneously recording the total circulation water quantity value in the first circle of water circulation work.
In the embodiment, the current outlet water temperature is collected until the current outlet water temperature reaches a preset target temperature;
collecting a plurality of backwater temperature values at intervals of second preset time within first preset time;
calculating the sum of the collected multiple backwater temperature values to obtain initial backwater temperature data;
acquiring current backwater temperature values at every second preset time interval continuously, correcting the backwater temperature data acquired last time according to the acquired current backwater temperature values, and after correction is carried out within third preset time or continuously for n times, summing calculation is carried out to obtain corrected backwater temperature data;
acquiring a current second backwater temperature value until the backwater temperature data after the current correction is respectively larger than each group of backwater temperature data obtained by the previous correction;
acquiring a third backwater temperature value again, and judging whether the third backwater temperature value meets a preset circulation condition or not; if so, completing the first circle of water circulation work, and simultaneously recording the total circulation water quantity value in the first circle of water circulation work, wherein the total circulation water quantity value is the volume of water stored in the pipeline; if not, returning to obtain the current backwater temperature value and comparing the current backwater temperature value with the preset circulating condition again.
Further, in this embodiment, the preset circulation condition is that the third backwater temperature value is greater than a sum of the second backwater temperature value and the coefficient, and the backwater temperature data corrected according to the third backwater temperature value is respectively greater than each set of backwater temperature data obtained by previous correction.
Specifically, in step S1061, after the current outlet water temperature reaches the preset target temperature, sampling the latest 10 sets of water temperature values a [0], a [1] … a [9], then performing summation calculation to obtain sum [0] = a [0] + a [1] + a [1] + a [2] + a [3] + a [4] + a [5] + a [6] + a [7] + a [8] + a [9], sampling data once every 500ms, and collecting sum [0] after 5S.
In step S1062, the data a [9] value sampled first is discarded, that is: a [9] = a [8], a [8] = a [7], … …, a [1] = a [0], a [0] = current value;
the 10 th s, the temperature summation values of the last 10 groups, sum [1], sum [2], … sum [9], sum [10], can be collected.
In step S1063, sum [ A ] is the Sum of the last 10 sets of data, i.e., sum [ A ] = Sum [1] + Sum [2] … + Sum [9] + Sum [10], sum [ B ] is the Sum of the last 10 sets of data from the first 1 acquisition of 500ms, and Sum [ J ] is the Sum of the last 10 sets of data from the first 8 acquisition of 500 ms.
Step S1064, when Sum [ A ] > Sum [ B ] > Sum [ C ] Sum [ D ] > Sum [ E ] > Sum [ F ] > Sum [ H ] > Sum [ I ] > Sum [ J ], the return water temperature continuously rises, at this time, the circulation is close to completing one circle, the return water temperature value at this time is recorded as Sum [ A ]/10, when the latest return water temperature value T is detected, when T > Sum [ A ]/10 and the latest sampling value still meets Sum [ A ] > Sum [ B ] > Sum [ C ] 8978 zx8978 Sum [ I ] > Sum [ J ], the return water temperature continuously rises by 2 degrees at this time, the water circulation is considered to have completed one circle, namely, the first circle of water circulation work is completed, and intelligent regulation is carried out after the water storage condition of the pipeline is intelligently identified, so that the gas inside the pipeline can be automatically cleaned.
And S107, reducing the heating power of the gas water heater to enable the current outlet water temperature value to reach a first preset temperature, and then stopping heating according to a preset time length.
In the embodiment, the heating power of the gas water heater is reduced to control the gas burner to heat by using the minimum preset power;
and stopping heating according to the preset time length until the current outlet water temperature value reaches the first preset temperature.
And step S108, simultaneously collecting the water flow of the current water circulation to obtain a first circulating water quantity value, and stopping the water circulation to finish the second water circulation work until the first circulating water quantity value reaches the total circulating water quantity value.
In the embodiment, the gas water heater continuously heats, meanwhile, the output power of the gas water heater is gradually reduced to enable the actual outlet water temperature to be close to 70 ℃, when the output power of the water heater is reduced to the minimum load, the minimum load is 3kw, the return water temperature is considered to reach more than 60 ℃, the pipeline is considered to be fully heated, and the management is filled with hot water; gather current actual outlet water temperature value, then can stop heating 30s when the outlet water temperature value of gathering surpasss 75 degrees to guarantee that hydrologic cycle in-process temperature can not lower the temperature by a wide margin, begin to calculate current hydrologic cycle's discharge value simultaneously in order to obtain first circulating water quantity value, when first circulating water quantity value reaches the total water quantity value of circulation, then stop hydrologic cycle in order to accomplish the work of second circle hydrologic cycle, thereby through full water route pasteurization with the most bacterium of clearance pipeline deposit aquatic.
And step S109, completing the circulating flushing work by controlling the action of the water pump, and prompting a user to open a water consumption point at the farthest end on a water outlet pipe of the gas water heater so as to discharge the stored water in the pipeline outwards.
In this embodiment, after the second water circulation is completed;
starting the water pump according to the maximum preset power;
reducing the power of the water pump until the current power of the water pump is increased to the maximum preset power;
increasing the power of the water pump until the current power of the water pump is reduced to the minimum preset power;
and simultaneously collecting the water flow of the current water circulation to obtain a second circulating water quantity value, and stopping the water circulation to finish the circulating flushing work until the second circulating water quantity value reaches three times of the total circulating water quantity value.
Specifically, after the gas water heater stops heating, the action of the water pump is controlled to flush impurities in the pipeline, the water pump is controlled to be started according to the maximum preset power, namely the power of the water pump is slowly increased to start the water pump, then the power of the water pump is slowly decreased to be the minimum preset power, namely the water pump is closed, the power is slowly increased to increase the power of the water pump to be the maximum preset power, namely the water pump is opened again, so that the purpose of adjusting the pressure change in the pipeline is achieved, one period is about 30s, meanwhile, the water flow value of the current water circulation is calculated to obtain a second circulating water flow value, and the circulating flushing work has three stages of high-pressure circulating flushing, low-pressure circulating flushing and high-pressure circulating flushing, so that the water circulation is stopped to finish the circulating flushing work until the second circulating water flow value reaches three times of the total circulating water flow value, and the pipeline flushing effect on the pressure change in the water passage is achieved by controlling the opening and closing of the water pump.
In this embodiment, after the circulation flushing work is completed;
prompting a user to open a water using point at the farthest end on a water outlet pipe of the gas water heater so as to discharge stored water in a pipeline outwards;
acquiring a current water discharge flow value;
and prompting the user that the water discharge work is finished until the water discharge flow value is larger than the total circulating water quantity value.
Specifically, the user is prompted to open the farthest hot water faucet to discharge the stored water in the pipeline, when the water discharge flow value is larger than the total circulating water quantity value, preferably, when the water discharge flow value reaches twice of the total circulating water quantity value, the user is prompted to finish water discharge, the gas water heater automatically exits from the self-cleaning mode after detecting that the farthest hot water faucet is turned off, the gas water heater enters into the common shower mode, namely, the set temperature is kept the same as the set temperature at the last time, and the user can normally discharge hot water by boiling water again.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A self-cleaning method of a zero-cold-water gas water heater is characterized by comprising the following steps:
after the gas water heater enters a self-cleaning mode, starting a water pump of the gas water heater, after the gas water heater is started, enabling stored water in a water outlet pipe to flow and be discharged through a water outlet pipe of the gas water heater, and enabling outflow water to flow back to the gas water heater through a water return pipe again so as to form a circulating pipeline;
collecting water flow in a preset time to obtain a total water flow value;
comparing the total water flow value with a preset water flow value, and controlling the gas water heater to perform ignition work according to a comparison result;
acquiring a current first backwater temperature value and a current water flow value, and calculating a water outlet temperature value when the gas water heater is heated by using the maximum preset power according to the acquired data;
adjusting the heating power of the gas water heater according to the calculated outlet water temperature value, and judging whether the calculated outlet water temperature value is smaller than a preset temperature value or not; if so, controlling the gas burner to heat by using the maximum preset power; if not, calculating the output power of the current gas water heater through a calculation formula, and controlling the gas water heater to heat by using the calculated output power;
if the current outlet water temperature reaches a preset target temperature, acquiring a plurality of return water temperature values until the acquired data meet a preset circulation condition so as to finish the first circle of water circulation work;
recording the total circulating water quantity value in the first circle of water circulation work;
reducing the heating power of the gas water heater to enable the current outlet water temperature value to reach a first preset temperature, and then stopping heating according to a preset time length;
simultaneously collecting the water flow of the current water circulation to obtain a first circulating water quantity value, and stopping the water circulation to finish the second water circulation until the first circulating water quantity value reaches the total circulating water quantity value;
the action of the water pump is controlled to complete the circular flushing work.
2. The self-cleaning method of a zero-cold-water gas water heater as claimed in claim 1, wherein the step of comparing the total water flow value with a preset water flow value and controlling the gas water heater to perform an ignition operation according to the comparison result comprises:
judging whether the total water flow value reaches a preset water flow value or not;
if so, opening a gas valve to control the gas water heater to perform ignition work;
if not, an alarm is sent to the user.
3. The self-cleaning method of a zero-cold water gas water heater as claimed in claim 1, wherein the outlet water temperature value when the gas water heater is heated with the maximum preset power is obtained by the following calculation formula: t out =13 × 25/L + T in, where T out is an outlet water temperature value when the gas water heater is heated using the maximum preset power, 13 is a set value, 25 is a threshold value, L is a current water flow value, and T in is a first return water temperature value.
4. The self-cleaning method of a zero-cold-water gas water heater as claimed in claim 1, wherein the output power of the current gas water heater is obtained by the following calculation formula: p = (T sets-T advances) × L/14, where P is the current output power of the gas water heater, T is set as a preset temperature value, T advances is a first return water temperature value, L is a current water flow value, and 14 is a coefficient.
5. The self-cleaning method of the zero-cold-water gas water heater according to claim 1, wherein the step of obtaining a plurality of backwater temperature values if the current outlet temperature reaches a preset target temperature until the obtained data meets a preset circulation condition to complete a first water circulation operation comprises:
collecting the current outlet water temperature until the current outlet water temperature reaches a preset target temperature;
collecting a plurality of backwater temperature values at intervals of second preset time within first preset time;
calculating the sum of the collected return water temperature values to obtain initial return water temperature data;
acquiring current backwater temperature values at every second preset time interval continuously, correcting the backwater temperature data acquired last time according to the acquired current backwater temperature values, and after correction is carried out within third preset time or continuously for n times, summing calculation is carried out to obtain corrected backwater temperature data;
acquiring a current second backwater temperature value until the backwater temperature data after the current correction is respectively larger than each group of backwater temperature data obtained by the previous correction;
obtaining a third backwater temperature value again, and judging whether the third backwater temperature value meets a preset circulation condition or not; if yes, finishing the first circle of water circulation work; if not, returning to obtain the current backwater temperature value and comparing the current backwater temperature value with the preset circulating condition again.
6. The self-cleaning method of the zero-cold-water gas water heater according to claim 5, wherein the preset circulation condition is that the third backwater temperature value is greater than the sum of the second backwater temperature value and the coefficient, and the backwater temperature data corrected according to the third backwater temperature value is respectively greater than each set of backwater temperature data obtained by previous correction.
7. The self-cleaning method of the zero-cold-water gas water heater according to claim 1, wherein the step of stopping heating according to a preset time length after reducing the heating power of the gas water heater to make the current outlet water temperature value reach a first preset temperature comprises:
reducing the heating power of the gas water heater to control the gas burner to heat by using the minimum preset power;
and stopping heating according to the preset time length until the current effluent temperature value reaches the first preset temperature.
8. A self-cleaning method for a zero-cold water gas water heater as claimed in claim 1, wherein said step of controlling the operation of said water pump to perform a cyclic flushing operation comprises:
after the second circle of water circulation work is finished;
starting the water pump according to the maximum preset power;
reducing the power of the water pump until the current power of the water pump is increased to the maximum preset power;
increasing the power of the water pump until the current power of the water pump is reduced to the minimum preset power;
and simultaneously collecting the water flow of the current water circulation to obtain a second circulating water quantity value, and stopping the water circulation to finish the circulating flushing work until the second circulating water quantity value reaches three times of the total circulating water quantity value.
9. A method of self-cleaning a zero-cold water gas heater as claimed in any one of claims 1 to 8, wherein said step of controlling said water pump to perform a cyclic flushing operation comprises:
after the circulation scouring work is finished;
prompting a user to open a water consumption point at the farthest end on a water outlet pipe of the gas water heater so as to discharge the stored water in the pipeline outwards;
acquiring a current water discharge flow value;
and prompting the user that the water discharge work is finished when the water discharge flow value is larger than the total circulating water quantity value.
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