CN111351227B - Water heater control method with zero cold water circulation function and water heater - Google Patents
Water heater control method with zero cold water circulation function and water heater Download PDFInfo
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- CN111351227B CN111351227B CN202010090450.XA CN202010090450A CN111351227B CN 111351227 B CN111351227 B CN 111351227B CN 202010090450 A CN202010090450 A CN 202010090450A CN 111351227 B CN111351227 B CN 111351227B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 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
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Abstract
The invention belongs to the technical field of water heaters, and discloses a control method of a water heater with a zero cold water circulation function, which comprises the following steps: acquiring a heat loss temperature value at the end of the last zero cold water circulation, wherein the heat loss temperature value is the difference value between the set outlet water temperature and the actual return water temperature during the last zero cold water circulation; setting a backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value; and when the actual backwater temperature value in the current zero-cold-water circulation is not less than the backwater stopping temperature value, stopping the circulation heating. According to the invention, the backwater stopping temperature value is set every time zero cold water circulation is performed, so that the backwater stopping temperature value meets the requirement of the current zero cold water circulation, and when the water outlet temperature reaches the backwater stopping temperature value, the circulation heating is stopped, so that the overhigh water outlet temperature after the zero cold water circulation is effectively avoided, and further, the user is prevented from being scalded.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a water heater control method with a zero cold water circulation function and a water heater.
Background
The zero-cold water technology is widely applied to the production and the manufacture of water heaters, the working principle of the zero-cold water technology is that cold water in a pipeline is circulated to the water heater for preheating, and a water return pipe is required or a cold water supply pipe is used as a water return pipeline. When a user uses the water heater to start circulation preheating, cold water stored in the water heater is heated into hot water, and then the purpose that the outlet water is the hot water is achieved.
At present, in the process of preheating the existing water heater with the function of zero cold water, when the return water temperature reaches the set temperature of a program, a circulating pump is closed to quit preheating. However, in the middle and later stages of the preheating process, the outlet water temperature of the water heater is often higher than the set temperature, if the hot water faucet is opened at the moment, a section of hot water flows out, and scalding accidents can be caused in serious cases to influence the bathing experience of users.
Disclosure of Invention
The invention aims to provide a water heater control method with a zero cold water circulation function and a water heater, which can effectively avoid overhigh outlet water temperature after zero cold water circulation and further avoid scalding a user.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method of a water heater with a zero cold water circulation function comprises the following steps:
acquiring a heat loss temperature value at the end of the last zero cold water circulation, wherein the heat loss temperature value is the difference value between the set outlet water temperature and the actual return water temperature during the last zero cold water circulation;
setting a backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value;
and when the actual backwater temperature value in the current zero-cold-water circulation is not less than the backwater stopping temperature value, stopping the circulation heating.
Preferably, the first preset temperature value satisfies the following formula: the first preset temperature value is set as a water outlet temperature-b heat loss temperature value, wherein b is not less than 1/3 and not more than 2/3.
Preferably, the first preset temperature value is a value stored in a database before leaving a factory, and the first preset temperature value is different corresponding to different seasons.
Preferably, the first preset temperature value is a value manually set by a user before starting the current zero-cold-water cycle.
Preferably, the setting of the water return stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value includes:
comparing the heat loss temperature value with a first heat loss temperature value, wherein the first heat loss temperature value is a temperature value lost after the end of one zero cold water circulation before the last zero cold water circulation;
and when the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is larger than or equal to a set value, resetting the backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value.
Preferably, when the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is smaller than a set value, the backwater stopping temperature value in the last zero-cold-water circulation is used as the backwater stopping temperature value in the current zero-cold-water circulation.
Preferably, the water return stopping temperature value is a difference value between the first preset temperature value and the heat loss temperature value.
Preferably, the heat loss temperature value is obtained at the end of the last zero cold water cycle.
Preferably, the heat loss temperature value is obtained at the beginning of the current zero cold water cycle.
The invention also provides a water heater, and a control method of the water heater with the zero cold water circulation function is adopted.
The invention has the beneficial effects that: through when zero cold water circulation at every turn, all set for stopping the return water temperature value, and then make this stop return water temperature value accord with the zero cold water circulation of current time required, when leaving water temperature reached this and stop the return water temperature value, then stop the circulation heating, effectively avoid the leaving water temperature behind the zero cold water circulation too high, and then avoided the user to be scalded.
Drawings
FIG. 1 is a flow chart of a method for controlling a water heater with zero cold water circulation according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a water heater with a zero cold water circulation function according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
The embodiment provides a control method of a water heater with a zero cold water circulation function, as shown in fig. 1, which includes the following steps:
and S10, acquiring a heat loss temperature value at the end of the last zero cold water cycle.
The heat loss temperature value in this step is the difference between the set outlet water temperature and the actual return water temperature at the last zero cold water circulation. That is to say, when obtaining the heat loss temperature value, it is first necessary to obtain the set outlet water temperature and the actual return water temperature at the last zero cold water circulation, where the set outlet water temperature is a temperature manually set by a user according to different needs, and the actual return water temperature may be obtained by setting a temperature sensor at the return water pipe for detection.
It should be noted that in this step, the heat loss temperature value may be obtained by calculation of the control module after the last zero-cooling-water cycle is finished, and then stored in the control module for use in the current zero-cooling-water cycle. Or when the current zero cold water circulation starts, the control module performs calculation and acquisition, and the storage step is omitted.
And S20, setting a water return stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value.
In this step, the first preset temperature value is set before the current zero-cooling-water cycle is performed. The first preset temperature value may be obtained by the following formula: the first preset temperature value is set as a water outlet temperature-b heat loss temperature value, wherein b is not less than 1/3 and not more than 2/3. Preferably, the first preset temperature value is set as the outlet water temperature-1/2 heat loss temperature value.
The first preset temperature value may also be a value stored in the database before shipment, and when necessary, the first preset temperature value is directly obtained from the database. Preferably, the first preset temperature value can be different when in different seasons, so that the control of the cyclic heating can be better performed according to different seasons.
The first preset temperature value can also be a value manually set by a user before the current zero-cold-water circulation is started, and at the moment, the first preset temperature value can be automatically set according to different tolerance degrees of the user on the temperature.
In this embodiment, the backwater stopping temperature value is a difference between a first preset temperature value and a heat loss temperature value.
And S30, stopping the circular heating when the actual backwater temperature value in the current zero-time cold water circulation is not less than the backwater stopping temperature value.
After the backwater stopping temperature value is obtained in step S20, the current zero cold water circulation is performed, that is, the water in the circulation pipeline is heated circularly, and the water temperature of the backwater pipeline is detected to obtain the actual backwater temperature.
When the actual backwater temperature is larger than or equal to the backwater stopping temperature value, the circular heating is stopped, and at the moment, when a user uses the device, the temperature value (namely the outlet water temperature) of the outlet water is not higher than the set outlet water temperature, so that the user is not scalded.
The following table is an example to illustrate the control method of this embodiment.
In the above table, before improvement, the stop return water temperature value is usually set to be-5 ℃ of the set outlet water temperature, the minimum temperature rise of the heated water in the circulation pipeline is 10 ℃, when the circulation heating is performed, the outlet water temperature value is set to be 42 ℃, the heat loss temperature value is assumed to be 8 ℃, the actual return water temperature value is 34 ℃ at the moment and is less than the stop return water temperature value 37 ℃, therefore, the water in the circulation pipeline can be continuously heated, taking the minimum temperature rise of 10 ℃ as an example, the water in the circulation pipeline can be continuously heated at the moment until the actual return water temperature value reaches 37 ℃, the circulation heating is stopped, the actual maximum outlet water temperature value reaches 47 ℃, the actual maximum outlet water temperature value is higher than the set outlet water temperature value, the outlet water is hot, and the possibility of scalding users exists.
By the control method of the embodiment, after improvement, a backwater stopping temperature value (i.e., 30 ℃) is calculated according to a first preset temperature value (for example, the first preset temperature value is a set outlet water temperature-1/2 heat loss temperature value, at this time, the first preset temperature value is 38 ℃) and a heat loss temperature value (8 ℃), when circulation heating is performed, the outlet water temperature value is set to be 42 ℃, the heat loss temperature value is assumed to be 8 ℃, the actual backwater temperature value is 34 ℃ and is greater than the backwater stopping temperature value (i.e., 30 ℃), at this time, circulation heating is stopped, that is, water in the circulation pipeline is not heated continuously, the actual highest outlet water temperature value in the circulation pipeline does not exceed 42 ℃, and when a user uses water, the highest outlet water temperature value is 42 ℃, and the user cannot be scalded.
According to the control method, through the steps, the return water stopping temperature value can be set every time zero cold water circulation is performed, so that the return water stopping temperature value meets the requirement of the current zero cold water circulation, when the outlet water temperature reaches the return water stopping temperature value, circulation heating is stopped, the outlet water temperature after the zero cold water circulation is effectively prevented from being too high, and the user is prevented from being scalded.
Example two
The difference between the present embodiment and the first embodiment is that the temperature value of the stop return water is set only when a specific condition is satisfied. Specifically, as shown in fig. 2, the control method of the water heater with zero cold water circulation function of the present embodiment includes the following steps:
s100, obtaining a heat loss temperature value at the end of the last zero cold water circulation.
S200, comparing the heat loss temperature value with the first heat loss temperature value, and judging whether the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is larger than or equal to a set value.
In this step, the first heat loss temperature value is a temperature value lost after the end of one zero cold water cycle before the last zero cold water cycle.
And after the first heat loss temperature value is obtained, comparing the heat loss temperature value with the first heat loss temperature value, and determining whether to reset the backwater stopping temperature value according to the comparison result.
S300, when the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is larger than or equal to a set value, resetting the backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value.
When the absolute value of the difference value between the two values is larger than or equal to the set value, the difference between the heat loss in the last zero cold water circulation and the heat loss in the last zero cold water circulation before the last zero cold water circulation is larger, the situation that the environment condition of the last zero cold water circulation is changed greatly is indicated, and the heat loss is suddenly changed, and at the moment, the backwater stopping temperature value needs to be reset, so that the backwater stopping temperature value in the current zero cold water circulation meets the requirement.
S400, when the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is smaller than a set value, the water return stopping temperature value in the previous zero-cold-water circulation is used as the water return stopping temperature value in the current zero-cold-water circulation.
When the absolute value of the difference value between the temperature value and the temperature value is smaller than the set value, the environmental conditions of several times of zero cold water circulation are similar, and at the moment, the water return stopping temperature value in the previous zero cold water circulation can be directly used as the water return stopping temperature value in the current zero cold water circulation without resetting the temperature value.
S500, when the actual backwater temperature value in the current zero-time cold water circulation is not less than the backwater stopping temperature value, stopping circulation heating.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A control method of a water heater with a zero cold water circulation function is characterized by comprising the following steps:
acquiring a heat loss temperature value at the end of the last zero cold water circulation, wherein the heat loss temperature value is the difference value between the set outlet water temperature and the actual return water temperature during the last zero cold water circulation;
setting a backwater stopping temperature value according to the heat loss temperature value and an obtained first preset temperature value, wherein the first preset temperature value meets the following formula: the first preset temperature value = a set water outlet temperature-b-heat loss temperature value, wherein b is not less than 1/3 and not more than 2/3, and the water return stopping temperature value is a difference value between the first preset temperature value and the heat loss temperature value;
and when the actual backwater temperature value in the current zero-cold-water circulation is not less than the backwater stopping temperature value, stopping the circulation heating.
2. The method for controlling the water heater with the zero cold water circulation function according to claim 1, wherein the setting of the backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value comprises:
comparing the heat loss temperature value with a first heat loss temperature value, wherein the first heat loss temperature value is a temperature value lost after the end of one zero cold water circulation before the last zero cold water circulation;
and when the absolute value of the difference value between the heat loss temperature value and the first heat loss temperature value is larger than or equal to a set value, resetting the backwater stopping temperature value according to the heat loss temperature value and the acquired first preset temperature value.
3. The method according to claim 2, wherein when the absolute value of the difference between the heat loss temperature value and the first heat loss temperature value is smaller than a predetermined value, the stop return water temperature value at the last zero-cooling-water cycle is used as the stop return water temperature value at the current zero-cooling-water cycle.
4. The method of claim 1, wherein the heat loss temperature value is obtained at the end of the last zero cold water cycle.
5. The method of claim 1, wherein the heat loss temperature value is obtained at the beginning of the current zero cold water cycle.
6. A water heater characterized by using the control method of the water heater with zero cold water circulation function as claimed in any one of claims 1 to 5.
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| CN112113345B (en) * | 2020-09-09 | 2022-02-22 | 华帝股份有限公司 | Method for judging completion of preheating cycle of gas water heater |
| CN112443985B (en) * | 2020-11-30 | 2022-03-15 | 广东万和新电气股份有限公司 | Circulating preheating control method, device and system for water heater |
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- 2020-02-13 CN CN202010090450.XA patent/CN111351227B/en active Active
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| KR100820650B1 (en) * | 2007-03-15 | 2008-04-08 | 주식회사 경동네트웍 | Method for controlling heating apparatus |
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