CN110186195B - Control method and control system of gas water heater - Google Patents
Control method and control system of gas water heater Download PDFInfo
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- CN110186195B CN110186195B CN201810497445.3A CN201810497445A CN110186195B CN 110186195 B CN110186195 B CN 110186195B CN 201810497445 A CN201810497445 A CN 201810497445A CN 110186195 B CN110186195 B CN 110186195B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 237
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000008236 heating water Substances 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims description 2
- 238000003287 bathing Methods 0.000 abstract description 5
- 230000001932 seasonal effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction 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
- F24H9/20—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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a control method of a gas water heater, which comprises the following concrete steps: the water heater determines the maximum heating water flow Lmax of the whole machine according to the preset temperature, the water inlet temperature and the rated load, determines the actual maximum water quantity Lsmax when the variable frequency water pump is started by 100%, then changes the working point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintains the constant-temperature variable frequency water pump to continuously work at the working point; the invention also discloses a control system of the gas water heater; the invention determines the most suitable working condition point of the variable frequency water pump by determining the maximum heating water flow of the whole machine and combining the actual maximum water quantity Lsmax of the water heater, thereby improving the bathing comfort level of a user.
Description
Technical Field
The invention belongs to the technical field of gas water heater control, and particularly relates to a gas water heater control method and a gas water heater control system.
Background
The gas water heater is a gas appliance widely applied in daily life, is also called as a gas water heater, and is used for transferring heat to cold water flowing through a heat exchanger by taking gas as fuel in a combustion heating mode so as to achieve the purpose of preparing hot water.
When user water pressure is low, actual water flow passing through the water heater is close to ignition water flow of the water heater, users cannot normally bath due to the fact that the water amount is small, and in addition, for a secondary water supply district, the water flow is reduced greatly when peak water consumption is reduced relatively to idle water flow due to unreasonable design of a water supply pipeline, and bathing comfort of the users is affected.
Disclosure of Invention
The invention aims to provide a control method of a gas water heater, which finds the most suitable working condition point of a variable frequency water pump by determining the maximum heating water flow of the whole machine and combining the actual maximum water quantity Lsmax of the water heater, thereby improving the bathing comfort level of a user.
Another object of the utility model is to provide a control system of gas heater.
The technical scheme adopted by the invention is as follows:
a control method of a gas water heater specifically comprises the following steps: the water heater determines the maximum heating water flow Lmax of the whole machine according to the preset temperature, the water inlet temperature and the rated load, determines the actual maximum water quantity Lsmax when the variable frequency water pump is started by 100%, then changes the working point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintains the constant-temperature variable frequency water pump to continuously work at the working point.
The invention is also characterized in that:
the water heater determines the maximum heating water flow Lmax of the whole machine according to the preset temperature, the inlet water temperature and the rated load, and the specific method comprises the following steps: lmax = Q/C Δ T, where Q is a thermal load, C is a specific heat capacity of water, and Δ T is a difference between a set temperature and a water inlet temperature.
Determining the actual maximum water quantity Lsmax when the variable frequency water pump is 100% started, and specifically: and determining the maximum water quantity Lsmax of the whole machine at the moment through a flow detection element in the pipeline after the actual water flow is more than or equal to 2L/min and the variable frequency water pump is started by 100%.
Changing the working condition point of the variable-frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the variable-frequency water pump is at a constant temperature, and maintaining the variable-frequency water pump at the constant temperature to continuously work at the working condition point, wherein the method specifically comprises the following steps: after the working condition point of the variable-frequency water pump is reduced, the current actual water quantity Lsmax 'is determined, and a heating water flow threshold value Lmax' is determined according to the maximum heating water flow Lmax:
when the Lsmax ' is less than or equal to the Lmax ', judging whether the effluent is at a constant temperature, if so, maintaining the constant-temperature variable-frequency water pump to continuously work at the working point, otherwise, recalculating the maximum heating water flow Lmax of the whole machine until the effluent is at the constant temperature after determining the rated load according to the temperature difference and the current actual water quantity Lsmax ', and if the whole machine cannot be at the constant temperature, entering a fault state of the whole machine;
and when the Lsmax 'is larger than the Lmax', judging whether the effluent is at constant temperature, if so, maintaining the constant-temperature variable-frequency water pump to continuously work at the working point, and otherwise, continuously reducing the working point of the variable-frequency water pump until the effluent is at constant temperature.
The heating water flow threshold value Lmax' is specifically as follows: lmax' = Lmax-delta L, and delta L is a water flow sacrifice value influenced by the rotating speed of the water pump.
A gas water heater control system comprises an information acquisition module and an adjustment module, wherein the information acquisition module is connected with the adjustment module;
the information acquisition module is used for determining the maximum heating water flow Lmax of the whole machine according to the preset temperature, the inlet water temperature and the rated load of the water heater, and determining the actual maximum water quantity Lsmax when the variable frequency water pump is 100% started;
the adjusting module is used for reducing the working condition point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintaining the constant-temperature variable frequency water pump to continuously work at the working condition point.
The invention is also characterized in that:
the information acquisition module determines the maximum heating water flow Lmax according to Lmax = Q/C delta T, wherein Q is a heat load, C is the specific heat capacity of water, and delta T is the difference between the set temperature and the inlet water temperature.
And the information acquisition module determines the actual maximum water quantity Lsmax according to the water flow detected by the water flow sensor.
The adjusting module adjusts the working condition point of the variable-frequency water pump through the relation between the maximum heating water flow Lmax and the heating water flow threshold Lmax' or recalculates the maximum heating water flow Lmax of the whole machine until the outlet water is constant in temperature.
Compared with the prior art, the invention determines the maximum heating water flow Lmax of the whole machine firstly, determines the actual maximum water flow Lsmax when the variable frequency water pump is started by 100 percent, then the most suitable working condition point of the variable frequency water pump is found according to the size relation between the maximum heating water flow Lmax and the actual maximum water amount Lsmax, the working condition point is maintained to work continuously, when the user changes the preset temperature or the inlet water temperature changes due to seasonal changes, the maximum heating water flow Lmax of the whole machine is determined again according to the preset temperature, the inlet water temperature and the rated load, and the working condition point of the variable frequency water pump is reduced according to the size relation between the variable frequency water pump and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and the variable-frequency water pump at the constant temperature is maintained to continuously work at the working condition point, so that the bathing comfort degree is improved, and the waste of resources caused by the complete opening of the variable-frequency water pump when the water pressure is lower is avoided.
Drawings
Fig. 1 is a flowchart of a control method of a gas water heater according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a control method of a gas water heater according to embodiment 2 of the present invention;
fig. 3 is a system block diagram of a gas water heater control system according to embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
step 101, determining the maximum heating water flow Lmax of the whole water heater according to a preset temperature, a water inlet temperature and a rated load by the water heater;
step 102, determining the actual maximum water quantity Lsmax when the variable frequency water pump is started by 100%;
103, comparing the size relationship between the maximum heating water flow Lmax and the actual maximum water amount Lsmax;
and 104, reducing the working condition point of the variable frequency water pump until the water outlet of the water heater is constant in temperature, and maintaining the constant-temperature variable frequency water pump to continuously work at the working condition point.
step 201, opening a water outlet valve in a standby state;
step 202, detecting the actual water flow in real time until the actual water flow is not less than 2L/min;
step 203, starting the variable frequency water pump by 100%;
step 204, determining the actual maximum water quantity Lsmax;
step 205, determining the maximum heating water flow Lmax of the whole machine according to the preset temperature, the inlet water temperature and the rated load of the water heater;
Lmax=Q/CΔT
wherein Q is the thermal load, C is the specific heat capacity of water, and Δ T is the difference between the set temperature and the inlet water temperature.
Step 206, reducing the working condition point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax;
step 207, determining the current actual water amount Lsmax';
208, when Lsmax 'is less than or equal to Lmax-delta L, judging whether the effluent is constant in temperature, if so, maintaining the variable frequency water pump at the constant temperature to continuously work at the working point, otherwise, recalculating the maximum heating water flow Lmax of the whole machine until the effluent is constant in temperature after determining the rated load according to the temperature difference and the current actual water amount Lsmax';
and when the Lsmax' is larger than the Lmax-0.2, judging whether the effluent is at constant temperature, if so, maintaining the variable frequency water pump at the constant temperature to continuously work at the working condition point, otherwise, continuously reducing the working condition point of the variable frequency water pump until the effluent is at the constant temperature.
In the whole process, the specific method for changing the working condition point of the variable-frequency water pump comprises the following steps: the duty ratio of the variable frequency water pump is changed, so that the rotating speed of the variable frequency water pump is changed, and the purpose of changing the working condition point is achieved; if the operating point does not need to be changed, the duty ratio is kept unchanged.
In addition, in the step 203, the variable frequency water pump is started 100% and lasts for at least 6 seconds, mainly because the variable frequency water pump needs 0.5-1s from starting to stable working, the time for the water flow sensor to realize the stable working is 0.5-1s, and meanwhile, the phenomenon that the water valve is slowly opened in the use process of an actual user is considered to be 1-2s, the starting time of the full opening of the water pump is comprehensively considered to be prolonged, and the maximum water flow Lsmax of the whole machine can be stably and reliably detected.
Lmax' = Lmax-Delta L, wherein Delta L is 0.2, and the rotating speed of the water pump is expected to be reduced slightly under the condition that the water flow is not sacrificed little by mainly considering that the water flow increment is gradually reduced along with the increase of the rotating speed after the water pump is matched with a water heater, and the resonance between the water pump and the whole machine is increased when the water pump is operated at a high rotating speed.
In the above embodiment, when the user changes the preset temperature or the inflow water temperature changes due to seasonal changes, the maximum heating water flow Lmax of the whole machine is determined again according to the preset temperature, the inflow water temperature and the rated load, the operating point of the variable frequency water pump is reduced according to the size relationship between the maximum heating water flow Lmax and the actual maximum water flow Lsmax until the water outlet of the water heater is at a constant temperature, and the variable frequency water pump at the constant temperature is maintained to continuously work at the operating point.
According to the embodiment, the maximum heating water flow Lmax of the whole machine is firstly determined, the actual maximum water quantity Lsmax is determined when the variable-frequency water pump is started by 100%, then the most suitable working condition point of the variable-frequency water pump is found according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax, the working condition point is maintained to work continuously, the bathing comfort degree of a user is improved, and the waste of resources caused by the fact that the variable-frequency water pump is completely started when the water pressure is low is also avoided.
Embodiment 3 of the present invention provides a gas water heater control system, as shown in fig. 3, which includes an information acquisition module 1 and an adjustment module 2, where the information acquisition module 1 is connected to the adjustment module 2;
the information acquisition module 1 is used for determining the maximum heating water flow Lmax of the whole machine according to the preset temperature, the inlet water temperature and the rated load of the water heater, and determining the actual maximum water quantity Lsmax when the variable frequency water pump is 100% started;
the adjusting module 2 is used for reducing the working condition point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintaining the constant-temperature variable frequency water pump to continuously work at the working condition point.
The information acquisition module 1 determines the maximum heating water flow Lmax according to Lmax = Q/C Δ T, wherein Q is a heat load, C is a specific heat capacity of water, and Δ T is a difference between a set temperature and a water inlet temperature.
The information acquisition module 1 determines the actual maximum water amount Lsmax according to the water flow detected by the water flow sensor.
The adjusting module 2 adjusts the working condition point of the variable frequency water pump or recalculates the maximum heating water flow Lmax of the whole machine until the outlet water is constant in temperature through the relation between the maximum heating water flow Lmax and the heating water flow threshold Lmax'.
By adopting the scheme, compared with the prior art, the maximum heating water flow Lmax of the whole machine is determined through the information acquisition module, the actual maximum water quantity Lsmax is determined when the variable-frequency water pump is started by 100%, the working condition point of the variable-frequency water pump is reduced through the adjustment module until the water outlet of the water heater is constant in temperature, the variable-frequency water pump at the constant temperature is maintained to continuously work at the working condition point, the optimal working condition point of the variable-frequency water pump is determined to be quickly found, and the energy is saved while the use requirement of a user is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A control method of a gas water heater is characterized by comprising the following concrete implementation methods: the water heater determines the maximum heating water flow Lmax of the whole machine according to the preset temperature, the water inlet temperature and the rated load, determines the actual maximum water quantity Lsmax when the variable frequency water pump is started by 100%, then changes the working point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintains the constant temperature of the variable frequency water pump to continuously work at the working point, specifically: after the working condition point of the variable-frequency water pump is reduced, the current actual water quantity Lsmax 'is determined, and a heating water flow threshold value Lmax' is determined according to the maximum heating water flow Lmax:
when the Lsmax ' is less than or equal to the Lmax ', judging whether the effluent is at a constant temperature, if so, maintaining the constant-temperature variable-frequency water pump to continuously work at the working point, otherwise, recalculating the maximum heating water flow Lmax of the whole machine until the effluent is at the constant temperature after determining the rated load according to the temperature difference and the current actual water quantity Lsmax ', and if the whole machine cannot be at the constant temperature, entering a fault state of the whole machine;
and when the Lsmax 'is larger than the Lmax', judging whether the effluent is at constant temperature, if so, maintaining the constant-temperature variable-frequency water pump to continuously work at the working point, and otherwise, continuously reducing the working point of the variable-frequency water pump until the effluent is at constant temperature.
2. The control method of the gas water heater according to claim 1, wherein the water heater determines the maximum heating water flow Lmax of the whole gas water heater according to the preset temperature, the inlet water temperature and the rated load, and the specific method is as follows: lmax = Q/C Δ T, where Q is a thermal load, C is a specific heat capacity of water, and Δ T is a difference between a set temperature and a water inlet temperature.
3. The control method of the gas water heater according to claim 2, characterized in that the actual maximum water amount Lsmax is determined when the variable frequency water pump is 100% on, specifically: and determining the maximum water quantity Lsmax of the whole machine at the moment through a flow detection element in the pipeline after the actual water flow is more than or equal to 2L/min and the variable frequency water pump is started by 100%.
4. The control method of a gas water heater according to claim 3, characterized in that said heating water flow threshold value Lmax' is specifically: lmax' = Lmax-delta L, and delta L is a water flow sacrifice value influenced by the rotating speed of the water pump.
5. A gas water heater control system, which adopts the control method of the gas water heater of any one of claims 1 to 4, characterized in that the control system comprises an information acquisition module and an adjustment module, wherein the information acquisition module is connected with the adjustment module;
the information acquisition module is used for determining the maximum heating water flow Lmax of the whole water heater according to the preset temperature, the inlet water temperature and the rated load of the water heater, and determining the actual maximum water quantity Lsmax when the variable frequency water pump is 100% started;
the adjusting module is used for reducing the working condition point of the variable frequency water pump according to the size relation between the maximum heating water flow Lmax and the actual maximum water quantity Lsmax until the water outlet of the water heater is constant in temperature, and maintaining the constant-temperature variable frequency water pump to continuously work at the working condition point.
6. The gas water heater control system of claim 5, wherein the information acquisition module determines a maximum heating water flow Lmax according to Lmax = Q/C Δ T, wherein Q is a heat load, C is a specific heat capacity of water, and Δ T is a difference between a set temperature and an inlet water temperature.
7. The gas water heater control system of claim 6, wherein the information acquisition module determines the actual maximum water flow Lsmax based on the water flow detected by the water flow sensor.
8. The gas water heater control system according to any one of claims 5-7, wherein the adjusting module adjusts the working condition point of the variable frequency water pump or recalculates the maximum heating water flow Lmax of the whole machine until the outlet water is at a constant temperature through the relationship between the maximum heating water flow Lmax and the heating water flow threshold value Lmax'.
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| CN110906563B (en) * | 2019-12-06 | 2021-05-18 | 华帝股份有限公司 | Intelligent pressurization control method for gas water heater |
| CN110940097B (en) * | 2019-12-16 | 2021-10-12 | 华帝股份有限公司 | Control method for self-adaptive starting ignition of gas water heater |
| CN111121302B (en) * | 2019-12-27 | 2021-07-02 | 华帝股份有限公司 | Intelligent pressurization control method for gas water heater |
| CN111623526B (en) * | 2020-04-26 | 2021-08-24 | 青岛海信日立空调系统有限公司 | Flow control method and device of water heater and water heater |
| CN112393432A (en) * | 2020-10-09 | 2021-02-23 | 华帝股份有限公司 | Intelligent automatic pressurization control method for water heater |
| CN114562819A (en) * | 2021-12-09 | 2022-05-31 | 浙江达峰科技有限公司 | Constant temperature control method for water heater |
| CN114234437B (en) * | 2021-12-13 | 2023-05-16 | 华帝股份有限公司 | Water heater and control method thereof |
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| JP3087207B2 (en) * | 1993-05-20 | 2000-09-11 | パロマ工業株式会社 | Circulating bath kettle controller |
| JP2002357358A (en) * | 2001-06-01 | 2002-12-13 | Paloma Ind Ltd | Hot-water pouring device for washing machine |
| CN101109576A (en) * | 2007-05-18 | 2008-01-23 | 海尔集团公司 | Thermostatic control method for instantaneously heated water heater |
| CN203053024U (en) * | 2012-12-17 | 2013-07-10 | 广东长虹数码科技有限公司 | Constant-temperature gas water heater control system with water yield settable |
| CN104236109B (en) * | 2013-06-24 | 2018-01-09 | 海尔集团公司 | The control method and control device of constant temp gas water heater |
| CN104456970A (en) * | 2014-11-21 | 2015-03-25 | 广东众辰科技有限公司 | Method for controlling maximum boiled water flow of rapid-heating water boiler without water tank |
| CN106322737B (en) * | 2015-06-18 | 2022-06-17 | 青岛经济技术开发区海尔热水器有限公司 | Gas water heater and control method thereof |
| CN106766186B (en) * | 2016-12-26 | 2022-06-21 | 广东万家乐燃气具有限公司 | Hot water circulating device with straight-flow pump and control system thereof |
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