CN112361609B - Low-pressure working method of gas water heater - Google Patents
Low-pressure working method of gas water heater Download PDFInfo
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- CN112361609B CN112361609B CN202011174976.2A CN202011174976A CN112361609B CN 112361609 B CN112361609 B CN 112361609B CN 202011174976 A CN202011174976 A CN 202011174976A CN 112361609 B CN112361609 B CN 112361609B
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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
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- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
The invention relates to a low-pressure working method of a gas water heater, S1, when the gas water heater works, calculating and obtaining the target load Q of the gas water heater according to the working parameters of the gas water heater; s2, judging whether the gas water heater needs to work in a full-load state according to the calculated target load Q of the gas water heater, and if so, performing S3 to perform low-pressure judgment on the gas water heater; if not, controlling the gas water heater to work normally; s3, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion; s4, calculating and obtaining the actual load Q1 of the gas water heater; and S5, comparing the Q1 with the rated maximum load Q0 of the gas water heater, and further judging whether low-pressure gas occurs or not. According to the low-air-pressure working method of the gas water heater, low-air-pressure judgment is carried out only when the gas water heater needs to work in a full-load state, and the low-air-pressure result obtained at the moment is more accurate and has more control guiding significance.
Description
Technical Field
The invention relates to the technical field of gas water heaters, in particular to a low-pressure judgment method for detecting the water inlet-free temperature of a gas water heater.
Background
In cold seasons, the gas water heater has a high utilization rate, the phenomenon of low primary pressure of the gas entering a house can occur, the rated heat load of the gas water heater can be reduced, the use thermal comfort of the gas water heater is reduced, and the user experience is poor. In the combustion process of the gas water heater, the opening degree of a determined gas proportional valve and the rotating speed of a fan can be set according to a target load, when the primary pressure is lower, the gas quantity can be obviously reduced under the same opening degree of the proportional valve, and if the gas water heater works according to the originally set rotating speed of the fan, the deviation of the air-fuel ratio can be larger, and the heat load is reduced. Therefore, when the gas water heater does not reach the rated maximum load working state, the combustion requirement under the low pressure condition is usually met by means of adjusting the proportional valve.
For example, in the chinese patent application CN111380228A (application No. 202010144344.5) of low pressure identification control method for gas water heater, the disclosed method judges the low pressure according to whether the gas water heater shifts, and adjusts the opening of the gas proportional valve when the pressure is judged to occur, so as to avoid the situation of shifting back and forth.
The invention discloses a control method of a gas water heater, the gas water heater and a computer readable storage medium, which is disclosed in the patent application of China's invention with the publication number of CN111609560A (application number of 202010313954.3). The disclosed method adjusts the opening degree of a gas proportional valve according to the load of the gas water heater, and can ensure the normal operation of the gas water heater without judging the low pressure in the working process.
Therefore, when the gas water heater is used, the low air pressure does not need to be judged under the condition that the gas proportional valve can be adjusted, the influence factors on the normal operation of the gas water heater are more, the accuracy of the low air pressure judged on the basis that the opening degree of the gas proportional valve can be adjusted is not high, and the load caused by other factors can not meet the target load. Under the condition of the rated maximum load working state of the gas water heater, which cannot be adjusted by the gas proportional valve, if a low-pressure condition occurs, the normal work of the gas water heater is greatly influenced, and the effective control on the normal work of the gas water heater can be effectively exerted just by judging the low pressure of the gas proportional valve under the condition, but the problem is not found in the prior art and the solution to the problem is provided.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a low-pressure working method of a gas water heater, which can reduce the number of times of low-pressure judgment of the gas water heater, and can effectively find that the gas water heater cannot meet the low-pressure condition under the normal working condition through the adjustment of a proportional valve, so as to avoid the poor experience of a user due to the stop of the gas water heater.
A second technical problem to be solved by the present invention is to provide a low-pressure operation method of a gas water heater, which can maintain the gas water heater to operate continuously as much as possible under the condition that low pressure occurs in the rated maximum load state of the gas water heater, so as to satisfy the basic hot water requirement that a user can continue to use the gas water heater even if the target temperature is not reached.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a low-pressure working method of a gas water heater is characterized by comprising the following steps: comprises the following steps
S1, when the gas water heater works, calculating and acquiring a target load Q of the gas water heater according to working parameters of the gas water heater;
s2, judging whether the gas water heater needs to work in a full-load state according to the calculated target load Q of the gas water heater, and if so, performing S3 to perform low-pressure judgment on the gas water heater; if not, controlling the gas water heater to work normally;
s3, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion;
s4, calculating and obtaining the actual load Q1 of the gas water heater;
and S5, comparing the Q1 with the rated maximum load Q0 of the gas water heater, and further judging whether low-pressure gas occurs or not.
Simply, in S5, if Q1 is less than kQ0, low air pressure is judged to occur, if Q1 is more than or equal to kQ0, the situation of low air pressure is judged not to occur, and the gas water heater is controlled to work normally;
wherein k is a proportionality coefficient, and k is more than or equal to 70% and less than or equal to 90%.
The technical scheme adopted by the invention for solving the second technical problem is as follows: in S5, when it is judged that the low air pressure is present, S6 is performed;
s6, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion;
s7, calculating the actual load Q2 of the gas water heater in real time;
s8, comparing the calculated Q2 with the rated maximum load Q0 of the gas water heater, judging whether Q2 is less than jQ0, if so, reminding a user that the gas water heater is short of gas supply, and simultaneously controlling a fan in the gas water heater to work according to the current rotating speed V or further reducing the rotating speed of the fan; if not, controlling a fan in the gas water heater to work according to the current rotating speed V;
wherein j is a low-pressure alarm threshold parameter, and j is more than 0 and less than k.
Simply, the calculation method of the target load Q of the gas water heater is as follows: and according to the target outlet water temperature T set by the user, and according to the inlet water temperature T0 and the inlet water flow L obtained from the gas water heater, further calculating the target load Q of the gas water heater.
Preferably, in S2, the method for determining whether the gas water heater needs to operate in the full load state includes comparing the target load Q of the gas water heater with the rated maximum load Q0 of the gas water heater, and if (1-a) Q0 is less than or equal to Q less than or equal to (1+ a) Q0, determining that the gas water heater needs to operate in the rated maximum load state, where a is an error coefficient, and 0 < a < 1.
Preferably, 0 < a < 6%.
Preferably, in S3, the preset gas water heater is capable of maintaining the combustion fan speed V ═ mV0, where V0 is the maximum speed of the fan in the gas water heater, where m is the adjustment coefficient, and 0 < m < 1.
Preferably, 70% < m < 90%.
Compared with the prior art, the invention has the advantages that: according to the low-air-pressure working method of the gas water heater, the low-air-pressure judgment of the gas water heater is only carried out when the target load reaches the full-load working state of the gas water heater, the judgment time is the time capable of directly influencing the normal operation of the gas water heater, the low-air-pressure judgment result obtained based on the time is more accurate, the gas water heater can be better guided to continue to work, the hot water requirement of a user can be basically maintained even if the outlet water temperature cannot meet the requirement of the user due to the low air pressure, the cold water condition caused by the fact that the gas water heater directly stops working is avoided, and the user experience is better.
Drawings
Fig. 1 is a flow chart of a low-pressure operation method of a gas water heater in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the method for operating a gas water heater at low pressure in the present embodiment specifically includes the following steps.
And S1, when the gas water heater works, calculating and acquiring the target load Q of the gas water heater according to the working parameters of the gas water heater. In this embodiment, the method for calculating the target load Q of the gas water heater includes: and according to the target outlet water temperature T set by the user, and according to the inlet water temperature T0 and the inlet water flow L obtained from the gas water heater, further calculating the target load Q of the gas water heater. The inlet water temperature T0 of the gas water heater can be directly detected and obtained by the inlet water temperature sensor for the gas water heater provided with the inlet water temperature sensor, and can be obtained by the method in the prior art for the gas water heater not provided with the inlet water temperature sensor, for example, by calculation and obtaining by the method in the chinese patent application "inlet water temperature calculation method for gas water heater" with the publication number CN111707002A (application number 202010428983.4).
S2, judging whether the gas water heater needs to work in a full-load state according to the calculated target load Q of the gas water heater, and if so, performing S3 to perform low-pressure judgment on the gas water heater; if not, controlling the gas water heater to work normally.
The method for judging whether the gas water heater needs to work in a full-load state comprises the steps of comparing a target load Q of the gas water heater with a rated maximum load Q0 of the gas water heater, and if Q0 is not less than (1-a) and not more than (1+ a) Q0, judging that the gas water heater needs to work in the rated maximum load state, wherein a is an error coefficient, a is more than 0 and less than 1, and the value a is specifically set according to control accuracy. If the value can be selected in the range of 0 < a < 6%, in this embodiment, a is 5%, so as to avoid the influence of other uncertain factors on the judgment.
S3, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion, wherein the V value can be obtained through experiments in a laboratory, the V value is a rotating speed value lower than the maximum rotating speed of the fan in the gas water heater, namely when low-pressure judgment is carried out in a full-load state in advance, in order to avoid the situation that flameout is caused if the rotating speed of the fan is too high under the real low-pressure condition, the rotating speed of the fan can be reduced to a safe rotating speed value in advance, and the situation that flameout does not occur even if the gas water heater is under the low-pressure condition is ensured.
The preset gas water heater in the embodiment can maintain the rotating speed V of a combustion fan to be mV0, wherein V0 is the highest rotating speed of the fan in the gas water heater, m is an adjusting coefficient, 0 < m < 1, and m can be 70% < m < 90%. The range of (c) is selected, and in this example, m is 80%.
S4, calculating and obtaining the actual load Q1 of the gas water heater; the calculation method of Q1 can adopt a common calculation method in the prior art, that is, the calculation is performed according to the actual water inlet temperature, the water outlet temperature and the water inlet flow of the gas water heater.
And S5, comparing the Q1 with the rated maximum load Q0 of the gas water heater, and further judging whether low-pressure gas occurs or not.
Specifically, if Q1 < kQ0, it is judged that low air pressure occurs, S6 is performed.
If Q1 is more than or equal to kQ0, judging that the low air pressure condition does not occur, and controlling the gas water heater to work normally. Wherein k is a proportionality coefficient, k is more than or equal to 70% and less than or equal to 90%, and k is 80% in the embodiment.
In order to ensure the accuracy of judgment, in the actual operation process, the Q1 can be calculated in real time within a preset time span, the condition that Q1 is less than kQ0 is timed, and if the time of the condition that Q1 is less than kQ0 exceeds a set time threshold, the low air pressure is judged to occur.
S6, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion, firstly ensuring that the gas water heater cannot be flamed out, and then carrying out S7.
And S7, calculating the actual load Q2 of the gas water heater in real time. The calculation mode of Q2 also adopts the common calculation method in the prior art, namely, the calculation is carried out according to the actual water inlet temperature, the water outlet temperature and the water inlet flow of the gas water heater.
And S8, comparing the calculated Q2 with the rated maximum load Q0 of the gas water heater, and judging whether Q2 is less than jQ0, wherein j is a low-pressure alarm threshold parameter, j is less than 0 and less than k, and j is 70% in the embodiment.
If the temperature of the water is lower than the preset temperature, the hot water can be discharged, and the hot water using requirement of the user under the condition of low air pressure and the working of the gas water heater under the full load state is met. The judging method of Q2 < jQ0 is also the same as the judging method of the condition of Q1 < kQ0 in S5, namely, in a time period, the time length of Q1 < kQ0 is timed, if the set time threshold value is exceeded, the condition of Q1 < kQ0 is determined, and then the user is reminded of insufficient air supply of the gas water heater.
If not, indicating that the low air pressure condition of the gas water heater is not serious, controlling a fan in the gas water heater to work according to the current rotating speed V.
After the user performs the water flow rate adjustment or the set temperature adjustment, the process may again proceed to S1 to determine whether or not the low air pressure determination is to be performed.
When the gas water heater works by using the low-pressure working method of the gas water heater, the low-pressure judgment of the gas water heater is only carried out when the target load reaches the full opening of the proportional valve of the gas water heater and the gas water heater needs to work in a full-load working state, so that the low-pressure judgment times in the working process of the gas water heater can be reduced, and the control complexity is reduced. In addition, the judgment time is the time when the normal operation of the gas water heater can be directly influenced because the proportional valve in the gas water heater cannot be adjusted, the low-air-pressure judgment result obtained based on the time is more accurate and more meaningful, the low-air-pressure result judged at the time can better guide the gas water heater to continue to work, the hot water requirement of a user can be basically maintained even if the outlet water temperature cannot meet the user requirement due to low air pressure, the condition that cold water is produced because the work is directly stopped is avoided, and the user experience is better.
Claims (7)
1. A low-pressure working method of a gas water heater is characterized by comprising the following steps: comprises the following steps
S1, when the gas water heater works, calculating and acquiring a target load Q of the gas water heater according to working parameters of the gas water heater;
s2, judging whether the gas water heater needs to work in a full-load state according to the calculated target load Q of the gas water heater, and if so, performing S3 to perform low-pressure judgment on the gas water heater; if not, controlling the gas water heater to work normally;
s3, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion;
s4, calculating and obtaining the actual load Q1 of the gas water heater;
s5, comparing the Q1 with the rated maximum load Q0 of the gas water heater, and further judging whether low-pressure gas occurs or not; if Q1 is less than kQ0, judging that low air pressure occurs, and if Q1 is more than or equal to kQ0, judging that the low air pressure does not occur, and controlling the gas water heater to normally work;
wherein k is a proportionality coefficient, and k is more than or equal to 70% and less than or equal to 90%.
2. The low pressure operation method of a gas water heater as claimed in claim 1, wherein: in S5, when it is judged that the low air pressure is present, S6 is performed;
s6, controlling the rotating speed of a fan in the gas water heater to be a preset rotating speed V at which the gas water heater can maintain combustion;
s7, calculating the actual load Q2 of the gas water heater in real time;
s8, comparing the calculated Q2 with the rated maximum load Q0 of the gas water heater, judging whether Q2 is less than jQ0, if so, reminding a user that the gas water heater is short of gas supply, and simultaneously controlling a fan in the gas water heater to work according to the current rotating speed V or further reducing the rotating speed of the fan; if not, controlling a fan in the gas water heater to work according to the current rotating speed V;
wherein j is a low-pressure alarm threshold parameter, and j is more than 0 and less than k.
3. The low pressure operation method of a gas water heater according to claim 1 or 2, wherein: the calculation method of the target load Q of the gas water heater comprises the following steps: and according to the target outlet water temperature T set by the user, and according to the inlet water temperature T0 and the inlet water flow L obtained from the gas water heater, further calculating the target load Q of the gas water heater.
4. The low pressure operation method of a gas water heater according to claim 1 or 2, wherein: in S2, the method for judging whether the gas water heater needs to work in the full load state is to compare the target load Q of the gas water heater with the rated maximum load Q0 of the gas water heater, if Q is more than or equal to (1-a) Q0 and less than or equal to (1+ a) Q0, the method judges that the gas water heater needs to work in the rated maximum load state, wherein a is an error coefficient, and a is more than 0 and less than 1.
5. The low pressure operation method of a gas water heater according to claim 4, wherein: a is more than 0 and less than 6 percent.
6. The low pressure operation method of a gas water heater according to claim 1 or 2, wherein: in S3, the preset gas water heater can maintain the combustion fan speed V ═ mV0, where V0 is the highest speed of the fan in the gas water heater, where m is the adjustment coefficient, and 0 < m < 1.
7. The low pressure operation method of a gas water heater as claimed in claim 6, wherein: m is more than 70 percent and less than 90 percent.
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| CN202011174976.2A CN112361609B (en) | 2020-10-28 | 2020-10-28 | Low-pressure working method of gas water heater |
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| CN113154688B (en) * | 2021-04-21 | 2022-09-13 | 瑞美(中国)热水器有限公司 | Control method of full-premixing condensing type gas positive displacement water heater and water heater |
| CN114136011A (en) * | 2021-12-07 | 2022-03-04 | 上海林内有限公司 | Operation method of gas water heater with function of prompting liquefied petroleum gas to be burnt out |
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| CA2372312C (en) * | 2002-02-18 | 2006-06-06 | Conematic Heating Systems Inc. | Heating system for liquids |
| JP2010203719A (en) * | 2009-03-05 | 2010-09-16 | Yamatake Corp | Method of detecting abnormality and water heater using the same |
| CN104296386B (en) * | 2013-07-18 | 2019-01-08 | 海尔集团公司 | Control method and control system of gas water heater and gas water heater |
| CN111141031B (en) * | 2018-11-05 | 2021-06-15 | 宁波方太厨具有限公司 | Automatic fault detection method for gas water heater |
| CN109915851B (en) * | 2019-01-23 | 2020-07-14 | 广东万和热能科技有限公司 | Low-pressure combustion control method and device for gas appliance, storage medium and gas appliance |
| CN111707002B (en) * | 2020-05-20 | 2021-11-12 | 宁波方太厨具有限公司 | Method for calculating inlet water temperature of gas water heater |
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