CN113983682A - Gas water heater and control method and device thereof - Google Patents
Gas water heater and control method and device thereof Download PDFInfo
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- CN113983682A CN113983682A CN202111431728.6A CN202111431728A CN113983682A CN 113983682 A CN113983682 A CN 113983682A CN 202111431728 A CN202111431728 A CN 202111431728A CN 113983682 A CN113983682 A CN 113983682A
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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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel
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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
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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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
Abstract
The application relates to a gas water heater and a control method and device thereof. The bypass pipe is arranged between the water outlet pipe and the water inlet pipe of the gas water heater, the bypass pipe is provided with a water proportional valve and a water switch valve, the water switch valve is used for controlling the on-off of the bypass pipe, the water proportional valve is used for adjusting the water flow of the bypass pipe, and the control method of the gas water heater comprises the following steps: if the water switch valve is closed, the water proportional valve is in the maximum opening degree and the water use temperature rises, controlling the water switch valve to open and adjusting the opening degree of the water proportional valve according to the target bypass water flow rate so as to enable the water outlet temperature of the gas water heater to be the same as the set temperature and judging whether the water use condition is finished; and after the water temperature rise condition is finished, controlling the water switch valve to be closed and adjusting the water proportional valve to be in the maximum opening degree. The control method of the gas water heater can prevent scalding risks and discomfort caused by water temperature rise to users, and greatly improves the use experience and the use safety of the gas water heater.
Description
Technical Field
The application relates to the technical field of gas water heaters, in particular to a gas water heater and a control method and device thereof.
Background
The gas water heater takes gas as fuel, transfers heat into the heat exchanger in a combustion heating mode, and realizes heat exchange with cold water in the heat exchanger so as to achieve the purpose of preparing hot water. The gas water heater has been developed for many years, has the advantages of convenient installation, good use safety and the like, and is widely applied to occasions needing hot water, such as bathrooms, kitchens and the like.
The problem that the outlet water temperature is far higher than the set temperature can occur in the situations that the gas water heater in the traditional technology continues to use hot water after the water pressure fluctuates and pauses, and the like, so that the situation that a user is scalded is caused.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a control method for a gas water heater, which can eliminate the water temperature rise of the gas water heater and prevent the user from being scalded.
The second technical problem to be solved by the present invention is to provide a gas water heater, which can eliminate the water temperature rise of the gas water heater, and prevent the user from being scalded.
The third technical problem to be solved by the present invention is to provide a control device for a gas water heater, which can eliminate the water temperature rise of the gas water heater and prevent the user from being scalded.
The first technical problem is solved by the following technical scheme:
a control method of a gas water heater is characterized in that a bypass pipe is arranged between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a water proportional valve and a water switch valve, the water switch valve is used for controlling the opening and closing of the bypass pipe, the water proportional valve is used for adjusting the water flow of the bypass pipe, and the control method of the gas water heater comprises the following steps: if the water switch valve is closed, the water proportional valve is in the maximum opening degree and the water use temperature rises, controlling the water switch valve to open and adjusting the opening degree of the water proportional valve according to the target bypass water flow rate so as to enable the water outlet temperature of the gas water heater to be the same as the set temperature and judging whether the water use condition is finished; and after the water temperature rise condition is finished, controlling the water switch valve to be closed and adjusting the water proportional valve to be in the maximum opening degree.
Based on the control method of the gas water heater in the embodiment, the bypass pipe of the gas water heater is simultaneously provided with the water switch valve and the water proportional valve, and the switch of the bypass pipe is controlled by the water switch valve, so that the water proportional valve can be adjusted to a proper opening degree from the maximum opening degree, the bypass pipe is ensured to neutralize hot water with the maximum water flow and the overhigh temperature when the water temperature rise condition is just started, the delay problem when the temperature rise is reduced is favorably prevented, and the water proportional valve can be in a proper opening degree to avoid the obvious water temperature fluctuation caused by overlarge flow. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
In one embodiment, the target bypass water flow is determined by: determining a load to be neutralized according to the outlet water temperature and the set temperature of a heat exchanger of the gas water heater and the inlet water flow of the gas water heater; and determining the target bypass water flow according to the load to be neutralized, the inlet water temperature of the gas water heater and the set temperature.
In one embodiment, if the water switch valve is closed, the water proportional valve is at the maximum opening degree, and the water temperature rises, the step of controlling the water switch valve to open and adjusting the opening degree of the water proportional valve according to the target bypass water flow rate so as to enable the outlet water temperature of the gas water heater to be the same as the set temperature comprises the following steps: and if the outlet water temperature of the heat exchanger of the gas water heater is higher than the first preset temperature, judging that the water temperature rise condition occurs.
In one embodiment, the water use temperature rise condition comprises a water flow sudden temperature rise condition; if the water switch valve is closed, the water proportional valve is in the maximum opening degree and the water temperature rise condition occurs, the water switch valve is controlled to be opened, and the opening degree of the water proportional valve is adjusted according to the target bypass water flow, so that the outlet water temperature of the gas water heater is the same as the set temperature, and the method comprises the following steps: and if the reduction of the water inlet flow of the gas water heater in the first preset time is greater than a preset threshold value and the water outlet temperature rise of the gas water heater is greater than a preset temperature rise, judging that the water flow sudden change temperature rise condition occurs.
The outlet water temperature of the gas water heater is monitored through the sensor, and because the high-temperature water is generated and can be monitored, a user still can be scalded, and whether the gas water heater needs to be started or not is judged according to the outlet water temperature of the heat exchanger of the gas water heater. And the water temperature rise is calculated to judge in the embodiment, so that the time for waiting for the temperature to be detected or waiting for the temperature rise is saved, and the response efficiency is greatly improved.
In one embodiment, the step of determining whether the water usage condition is over includes: and if the outlet water temperature of the heat exchanger of the gas water heater is lower than the second preset temperature, judging that the water temperature rise condition is finished.
In one embodiment, the duration of controlling the opening of the water switch valve and adjusting the opening of the water proportional valve according to the target bypass water flow is longer than a second preset time.
The lower limit value of the opening time is set for the opening of the bypass pipe, and the problem that the water switch valve is opened and closed frequently is avoided.
In one embodiment, after the water temperature rise condition is over, controlling the water switch valve to close and adjusting the water proportional valve to the maximum opening further comprises: and after the water temperature rise condition is finished, controlling the water switch valve to be closed, adjusting the water proportional valve to be in the maximum opening degree, and controlling the temperature of hot water according to the outlet water temperature and the set temperature of the gas water heater.
The switching of the temperature sensors is carried out after the water temperature rise condition is finished, the hot water temperature control is carried out again according to the water outlet temperature and the set temperature of the gas water heater, and the set position of the water outlet temperature sensor is closer to the water end of a user than the set position of the temperature rise sensor, so that the temperature control carried out according to the water outlet temperature fed back by the water outlet temperature sensor is more accurate.
The second technical problem is solved by the following technical solutions:
a gas water heater comprising: a water inlet pipe and a water outlet pipe; the bypass pipe is arranged between the water inlet pipe and the water outlet pipe; the water switch valve is arranged on the bypass pipe and used for controlling the on-off of the bypass pipe; the water proportional valve is arranged on the bypass pipe and used for adjusting the water flow of the bypass pipe; and the controller is connected with the water switch valve and the water proportional valve and comprises a memory and a processor, the memory stores a computer program, and the processor realizes the steps of the control method of the gas water heater when executing the computer program.
Based on gas heater in this embodiment, water switch valve and water proportional valve have been set up simultaneously at gas heater's bypass pipe, switch through water switch valve control bypass pipe for water proportional valve can begin to adjust to suitable aperture by maximum aperture, guarantee that the bypass pipe just with the hot water of maximum discharge and high temperature when the water temperature rise condition just begins, help preventing the time delay problem when the temperature rise reduces, can make this water proportional valve be in comparatively suitable aperture again so that the flow is too big to cause the temperature to fluctuate obviously. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
In one embodiment, the gas water heater further comprises: the water inlet flow sensor is arranged on the water inlet pipe and used for acquiring the water inlet flow of the gas water heater; the inlet water temperature sensor is arranged on the inlet water pipe and used for acquiring the inlet water temperature of the gas water heater; the water outlet temperature sensor is arranged on the water outlet pipe and used for acquiring the water outlet temperature of the gas water heater; and the temperature rise sensor is arranged at the water outlet of the heat exchanger of the gas water heater and used for acquiring the water outlet temperature of the heat exchanger of the gas water heater.
The third technical problem is solved by the following technical scheme: the utility model provides a controlling means of gas heater, is provided with the bypass pipe between gas heater's outlet pipe and the inlet tube, and the bypass pipe is provided with water proportional valve and water switch valve, and the water switch valve is used for controlling the switch of bypass pipe, and the water proportional valve is used for adjusting the discharge of bypass pipe, and gas heater's controlling means includes: the first control module is used for controlling the water switch valve to open and regulating the opening of the water proportional valve according to the target bypass water flow if the water switch valve is closed, the water proportional valve is in the maximum opening and the water temperature rise occurs, so that the water outlet temperature of the gas water heater is the same as the set temperature; and the second control module is used for controlling the water switch valve to be closed and adjusting the water proportional valve to be in the maximum opening degree after the water temperature rise condition is finished.
Based on the controlling means of gas heater in this embodiment, set up water switch valve and water proportional valve simultaneously at gas heater's bypass pipe, switch through water switch valve control bypass pipe for water proportional valve can begin to adjust to suitable aperture by the maximum aperture, guarantee that the bypass pipe just with the hot water of maximum discharge and high temperature when the water temperature rise condition just begins, help preventing the time delay problem when the temperature rise reduces, can make this water proportional valve be in comparatively suitable aperture again so that the too big temperature fluctuation that causes of flow is obvious. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a gas water heater in one embodiment;
FIG. 2 is a schematic flow chart diagram of a control method for a gas water heater in one embodiment;
FIG. 3 is a schematic flow chart illustrating the process of obtaining a target bypass water amount according to one embodiment;
FIG. 4 is a schematic flow chart of a control method of a gas water heater in another embodiment;
FIG. 5 is a schematic flow chart diagram illustrating a method of controlling a gas water heater in accordance with still another embodiment;
FIG. 6 is a schematic structural diagram of a gas water heater in yet another embodiment;
FIG. 7 is a block diagram showing the structure of a control device of the gas water heater in one embodiment;
description of reference numerals: 10-a controller, 20-a water outlet pipe, 30-a water inlet pipe, 40-a bypass pipe, 41-a water proportional valve, 43-a water switch valve, 50-a combustor, 60-a heat exchanger, 71-a water inlet flow sensor, 73-a water inlet temperature sensor, 75-a water outlet temperature sensor, 77-a temperature rise sensor, 79-a bypass water flow sensor, 80-a one-way valve, 110-a first control module and 130-a second control module.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Just as the background art, the gas heater in the prior art has the condition of water temperature rise, and the inventor finds that the common conditions of water temperature rise include the condition of water cut-off temperature rise and the condition of water flow sudden change temperature rise. The condition of water cut-off and temperature rise refers to the condition that a user stops using water during the water use process and then continues using water, because the gas water heater generates hot water by heating the heat exchanger through the combustion of gas and the heat generated by the combustion of the gas, when the user stops using the water heater, the temperature of the heat exchanger is still higher, the residual temperature of the heat exchanger can continuously heat the water remained in the heat exchanger to enable the water to continue to rise, and the residual temperature exceeds the set temperature, so that the water cut-off and temperature rise is generated. When the water heater is used again without the reduction of the water cut-off temperature rise, high-temperature hot water flows out successively, so that the water outlet temperature of the gas water heater is greatly increased compared with the set temperature of a user. The sudden water flow temperature rise condition refers to that when the water supply pressure of the gas water heater is suddenly reduced, a certain time is required for the heat load change of the gas water heater, so that relatively less water flow is heated by a larger heat load, and the water outlet temperature of the gas water heater is greatly increased compared with the set temperature of a user.
For the above reasons, the present invention provides a control method of a gas water heater, which can be applied to the controller 10 of the gas water heater shown in fig. 1. The burner 50 of the gas water heater obtains gas through the gas inlet, and the gas is combusted in the burner 50 to heat the water flow in the heat exchanger 60, so as to generate hot water. A bypass pipe 40 is arranged between the water outlet pipe 20 and the water inlet pipe 30 of the gas water heater. The bypass pipe 40 is provided with a water proportional valve 41 and a water switching valve 43. The water switching valve 43 is used to control the opening and closing of the bypass pipe 40. The water proportional valve 41 is used for adjusting the water flow of the bypass pipe 40, and the opening degree of the water proportional valve 41 influences the water flow of the bypass pipe 40. When the water switching valve 43 is opened, the bypass pipe 40 is closed by the water proportional valve 41 being at the minimum opening degree, and the bypass pipe 40 is fully conducted by the water proportional valve 41 being at the maximum opening degree. As shown in fig. 2, the control method of the gas water heater includes steps S202 and S204.
S202, if the water switch valve 43 is closed, the water proportional valve 41 is in the maximum opening degree, and the water use temperature rises, the water switch valve 43 is controlled to be opened, the opening degree of the water proportional valve 41 is adjusted according to the target bypass water flow, so that the outlet water temperature of the gas water heater is the same as the set temperature, and whether the water use condition is finished or not is judged.
It can be understood that when the gas water heater is in the water temperature rise condition, the cold water introduced through the bypass pipe 40 is mixed with the superheated water flowing out of the heat exchanger 60 of the gas water heater to reduce the water temperature, and the water temperature rise condition is dealt with. However, since it takes a certain time to adjust the opening of the water proportional valve 41, the bypass pipe 40 needs to be adjusted from the minimum opening only by controlling the bypass pipe 40 by means of the water proportional valve 41, which results in a small amount of water that can be output by the bypass pipe 40 upon the occurrence of a water temperature rise, a weak neutralizing capability for hot water with an excessively high temperature, and possibly hot water with an excessively high temperature to be output to a user. Therefore, in the embodiment, the water switch valve 43 is additionally arranged, when the bypass pipe 40 is not needed, the bypass pipe 40 is closed by the water switch valve 43, and the water proportional valve 41 is in the maximum opening degree, so that based on the structure, when the water temperature rise occurs, the bypass pipe 40 can neutralize the hot water with the highest temperature by the maximum water flow rate through the water switch valve 43, and the situation that the water temperature is overheated due to the insufficient neutralizing capacity of the hot water in the opening degree adjusting process of the water proportional valve 41 is avoided. In an idle period in which the bypass pipe 40 of the gas water heater is not used, if the water switch valve 43 is not at the maximum opening degree, the opening degree of the water switch valve 43 is adjusted to the maximum opening degree. For example, in the case where the user suspends the use of hot water, the opening degree of the water switch valve 43 is detected, and if the opening degree of the water switch valve 43 is not at the maximum opening degree, the opening degree of the water switch valve 43 is automatically adjusted to the maximum opening degree.
The target bypass water flow rate refers to the water flow rate of the bypass pipe 40 when matching the outlet water temperature of the gas water heater with the set temperature. After the opening degree of the water proportional valve 41 is adjusted according to the target bypass water flow, hot water with higher temperature output by heat exchange of the gas water heater and cold water with the target bypass water flow are mixed, so that the outlet water temperature of the gas water heater is the set temperature. At this time, whether the water temperature rise is completed or not is monitored, and if the water temperature rise is not completed, the cold water of the target bypass water flow rate is kept to be output through the bypass pipe 40. If the water temperature rise is completed, the process proceeds to step S204.
And S204, after the water temperature rise condition is finished, controlling the water switch valve 43 to be closed and adjusting the water proportional valve 41 to be at the maximum opening.
It can be understood that after the water temperature rise condition is over, the bypass pipe 40 is not needed to output cold water to neutralize hot water output by the heat exchanger 60, and the gas water heater can output hot water with set temperature by controlling heat load. In order to ensure the ability of the subsequent gas water heater to cope with the water temperature rise, the bypass pipe 40 is closed by controlling the water switch valve 43, and the water proportional valve 41 needs to be adjusted to the maximum opening, so that the opening of the water proportional valve 41 can be adjusted from the maximum opening when the water temperature rise occurs next time.
Based on the control method of the gas water heater in the embodiment, the bypass pipe 40 of the gas water heater is simultaneously provided with the water switch valve 43 and the water proportional valve 41, and the water switch valve 43 controls the on-off of the bypass pipe 40, so that the water proportional valve 41 can be adjusted to a proper opening degree from the maximum opening degree, the bypass pipe 40 is ensured to neutralize hot water with the maximum water flow and the overhigh temperature when the water temperature rise condition begins, the delay problem when the temperature rise is reduced is prevented, and the water proportional valve 41 can be in a proper opening degree to avoid the obvious water temperature fluctuation caused by overlarge flow. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
In one embodiment, as shown in FIG. 3, the target bypass water flow is determined by step S302 and step S304.
And S302, determining the load to be neutralized according to the outlet water temperature and the set temperature of the heat exchanger 60 of the gas water heater and the inlet water flow of the gas water heater.
It will be appreciated that the load required to change water from one temperature to another is positively correlated to the difference between the two temperatures and the weight of the water, as can be seen from the formula for specific heat capacity. The water weight and the water flow are positively correlated, and the water flow output by the heat exchanger 60 of the gas water heater is the same as the water inlet flow of the gas water heater. Therefore, the to-be-neutralized load required to reduce the hot water with higher temperature output by the heat exchanger 60 of the gas water heater to the set temperature can be determined according to the outlet water temperature of the heat exchanger 60 of the gas water heater, the set temperature and the inlet water flow rate of the gas water heater. The temperature of the outlet water of the heat exchanger 60 of the gas water heater can be obtained by a temperature rise sensor arranged at the hot water output end of the heat exchanger 60 of the gas water heater, and the inlet water flow of the gas water heater can be obtained by an inlet water flow sensor arranged at the inlet pipe 30.
And S304, determining the target bypass water flow according to the load to be neutralized, the inlet water temperature of the gas water heater and the set temperature.
The temperature of the cold water output by the bypass pipe 40 is the same as the inlet water temperature of the gas water heater, and the load to be neutralized can raise the inlet water temperature of the target bypass water flow to the set temperature. Similar to the principle in step S302, the target bypass water flow rate can be determined according to the load to be neutralized, the inlet water temperature of the gas water heater, and the set temperature, so that the temperature of the water output by the gas water heater after the final neutralization is the set temperature. The temperature of the inlet water of the gas water heater can be obtained by an inlet water temperature sensor provided at the inlet pipe 30.
In one embodiment, the steps in FIG. 3 may be performed by:
in the formula, LPIs the target bypass water flow, ThighIs the outlet water temperature, T, of the heat exchanger 60 of a gas water heatersetTo set the temperature, LinIs the water inlet flow rate of the gas water heater, TinThe temperature of the inlet water of the gas water heater. (T)high-Tset)×LinI.e. the load to be neutralized.
In one embodiment, as shown in fig. 4, the control method of the gas water heater includes steps S402 to S406.
S402, if the water outlet temperature of the heat exchanger 60 of the gas water heater is higher than a first preset temperature, determining that the water temperature rise condition occurs.
It is understood that the first preset temperature can be set according to actual needs. The water temperature rise condition comprises a water cut-off temperature rise condition and a water flow sudden change temperature rise condition. For the water cut off temperature rise case, in a preferred embodiment, the first preset temperature is determined by: obtaining an expected water cut-off temperature according to the set temperature, and setting a first preset temperature according to the expected water cut-off temperature; the first preset temperature is higher than the expected water cut-off temperature and lower than the set temperature. The expected water cut-off temperature refers to a temperature reached by water at a set temperature in the gas water heater under the condition that the water is naturally cooled without being heated by the residual heat of the heat exchanger 60 after the user suspends the water use, and the expected water cut-off temperature corresponding to each set temperature can be measured through experiments, and the expected water cut-off temperature corresponding to each set temperature can also be calculated by calculating the cooling speed of the water according to the room temperature. If the outlet water temperature of the heat exchanger 60 of the gas water heater is more than the expected cut-off water temperature, it is considered that a cut-off water temperature rise condition will occur, and therefore the first preset temperature is set to a value higher than the expected cut-off water temperature. Since a certain time is required for heating the water by the waste heat of the heat exchanger 60 and adjusting the opening degree of the water proportional valve 41, the first preset temperature is set to be a value lower than the set temperature, it is ensured that the control of the bypass pipe 40 is started before the water temperature is heated to exceed the set temperature, and the reaction speed to the temperature rise of the water is accelerated. For the water cut off temperature rise case, in one particular embodiment, the first preset temperature is a value that is less than 5 ℃ of the set temperature. In one embodiment, for the case of sudden temperature rise of the water flow, if the determination is made in step S402, since the sudden drop of the water flow rate and the load is not due to reduction, heating less water with a higher load will cause the outlet water temperature of the heat exchanger to be higher than the set temperature, and therefore, in this case, the first preset temperature should be higher than the set temperature.
S404, if the water switch valve 43 is closed, the water proportional valve 41 is in the maximum opening degree and the water use temperature rises, controlling the water switch valve 43 to be opened, adjusting the opening degree of the water proportional valve 41 according to the target bypass water flow rate so as to enable the outlet water temperature of the gas water heater to be the same as the set temperature, and judging whether the water use condition is finished.
Step S404 is the same as step S202, and the above can be referred to.
And S406, after the water temperature rise condition is finished, controlling the water switch valve 43 to be closed and adjusting the water proportional valve 41 to be at the maximum opening.
Step S406 is the same as step S204, and the above can be referred to.
In one embodiment, the water temperature rise condition includes a water flow sudden temperature rise condition, and as shown in fig. 5, the control method of the gas water heater includes steps S502 to S506.
S502, if the reduction of the water inlet flow of the gas water heater in the first preset time is larger than a preset threshold value and the water outlet temperature rise of the gas water heater is larger than a preset temperature rise, the situation that the water flow suddenly changes temperature rise is judged.
It can be understood that the inflow of water of the gas water heater is monitored in real time according to the sudden temperature rise condition of water flow, and the outflow of water of the gas water heater can be overhigh when the inflow of water of the gas water heater is suddenly reduced. In order to further determine whether the temperature rise problem occurs, the temperature rise of the outlet water of the gas water heater can be calculated according to the difference between the current load of the gas water heater and the load before the first preset time and the water inlet flow of the gas water heater, and whether the bypass pipe 40 needs to be opened or not is determined according to the comparison result of the temperature rise of the outlet water and the preset temperature rise. The outlet water temperature of the gas water heater is monitored through the sensor, and since the high-temperature water is generated and can be monitored, a user may still be scalded, and whether the gas water heater needs to be started or not is judged by the mode in the step S402, and a certain hysteresis exists. And the water temperature rise is calculated to judge in the embodiment, so that the time for waiting for the temperature to be detected or waiting for the temperature rise is saved, and the response efficiency is greatly improved.
S504, if the water switch valve 43 is closed, the water proportional valve 41 is in the maximum opening degree, and the water flow sudden-change temperature rise condition occurs, the water switch valve 43 is controlled to be opened, the opening degree of the water proportional valve 41 is adjusted according to the target bypass water flow, so that the outlet water temperature of the gas water heater is the same as the set temperature, and whether the water use condition is finished or not is judged.
Step S504 is similar to step S202, and reference is made to the above.
And S506, after the water flow sudden change temperature rise condition is finished, controlling the water switch valve 43 to be closed and adjusting the water proportional valve 41 to be in the maximum opening degree.
Step S506 is similar to step S204, and reference is made to the above.
In one embodiment, the calculated water temperature rise may be performed by the following equation:
in the formula, delta T is the water outlet temperature rise and Load1Load of gas water heater before first preset time2Is the current load of the gas water heater, LinThe water inlet flow of the gas water heater.
In one embodiment, the first predetermined time is 3 seconds and the predetermined threshold is 1L/min. The preset temperature rise is 3 ℃.
In one embodiment, the step of determining whether the water usage condition is over includes: and if the water outlet temperature of the heat exchanger 60 of the gas water heater is lower than the second preset temperature, judging that the water temperature rise condition is over. It will be appreciated that the outlet water temperature of the heat exchanger 60 of the gas water heater being less than the second predetermined temperature means that the waste heat of the heat exchanger 60 has been consumed or the water flow fluctuations have disappeared and the heat exchanger 60 will not overheat the water flow. In a specific embodiment, the second preset temperature is a value 2 ℃ higher than the set temperature.
In one embodiment, the duration of the opening of the water proportional valve 41 is controlled to be opened and adjusted according to the target bypass water flow rate by controlling the water switch valve 43 to be opened is greater than the second preset time. It can be understood that, in order to ensure the sensitivity of starting the bypass pipe 40, a situation may occur in which the first preset temperature is set to be lower than the second preset temperature, which will cause the controller 10 to determine that the water temperature rise condition occurs, and immediately determine that the water temperature rise condition is over when the water temperature rises to an excessively high value, so that the water switch valve 43 is opened and closed frequently, so the present embodiment sets the opening time lower limit value for opening the bypass pipe 40, so as to avoid the above problem. In one embodiment, the second predetermined time is 5 seconds.
In one embodiment, after the water temperature increasing condition is over, controlling the water switch valve 43 to close and adjusting the water proportional valve 41 to the maximum opening further comprises: and after the water temperature rise condition is finished, controlling the water switch valve 43 to be closed, adjusting the water proportional valve 41 to be in the maximum opening degree, and controlling the temperature of the hot water according to the outlet water temperature and the set temperature of the gas water heater. It can be understood that, because the constant temperature control procedure of the hot water temperature of some gas water heaters is performed according to the outlet water temperature fed back by the outlet water temperature sensor of the gas water heater, when dealing with the water temperature rise situation, the constant temperature control of the gas water heater is performed according to the outlet water temperature of the heat exchanger 60 of the gas water heater fed back by the temperature rise sensor. Therefore, after the water temperature rise condition is finished, the temperature sensor is switched, and the hot water temperature is controlled again according to the outlet water temperature and the set temperature of the gas water heater. In addition, the setting position of the water outlet temperature sensor is closer to the water using end of a user than the setting position of the temperature rise sensor, so that the temperature control according to the water outlet temperature fed back by the water outlet temperature sensor is more accurate.
It should be understood that although the various steps in the flowcharts of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
Referring to fig. 1, a gas water heater is further provided in an embodiment of the present invention. The gas water heater includes a water inlet pipe 30, a water outlet pipe 20, a bypass pipe 40, a water proportional valve 41, a water switch valve 43, and a controller 10. A bypass pipe 40 is provided between the inlet pipe 30 and the outlet pipe 20. A water switching valve 43 is provided in the bypass pipe 40 for controlling the opening and closing of the bypass pipe 40. A water proportional valve 41 is provided in the bypass pipe 40 for adjusting the flow rate of water of the bypass pipe 40. The controller 10 is connected with the water switch valve 43 and the water proportional valve 41, and comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the following steps when executing the computer program:
if the water switch valve 43 is closed, the water proportional valve 41 is in the maximum opening degree and the water use temperature rises, controlling the water switch valve 43 to be opened and adjusting the opening degree of the water proportional valve 41 according to the target bypass water flow so as to enable the water outlet temperature of the gas water heater to be the same as the set temperature and judge whether the water use condition is finished; after the water temperature rise is finished, the water switch valve 43 is controlled to be closed and the water proportional valve 41 is adjusted to be at the maximum opening degree.
In some embodiments, the processor, when executing the computer program, performs the steps of any of the above-described embodiments of the method for controlling a gas water heater.
Based on the gas water heater in this embodiment, the bypass pipe 40 of the gas water heater is simultaneously provided with the water switch valve 43 and the water proportional valve 41, and the switch of the bypass pipe 40 is controlled by the water switch valve 43, so that the water proportional valve 41 can be adjusted to a proper opening degree from the maximum opening degree, the bypass pipe 40 is ensured to neutralize hot water with the maximum water flow and the overhigh temperature when the water temperature rise condition is just started, the delay problem when the temperature rise is reduced is favorably prevented, and the water proportional valve 41 can be in a proper opening degree to prevent the water temperature fluctuation from being obvious due to overlarge flow. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
In one embodiment, referring to fig. 6, the gas water heater further includes an inlet water flow sensor 71, an inlet water temperature sensor 73, an outlet water temperature sensor 75, and a temperature rise sensor 77. The inlet water flow sensor 71 is disposed on the inlet pipe 30 for obtaining the inlet water flow of the gas water heater. The inlet water temperature sensor 73 is arranged on the inlet pipe 30 and is used for acquiring the inlet water temperature of the gas water heater. The outlet water temperature sensor 75 is arranged on the outlet pipe 20 and is used for acquiring the outlet water temperature of the gas water heater. The temperature rise sensor 77 is arranged at the water outlet of the heat exchanger 60 of the gas water heater and is used for acquiring the water outlet temperature of the heat exchanger 60 of the gas water heater. In some embodiments, the gas water heater may further include a check valve 80 between the water switch valve 43 and the water inlet pipe 30, and a bypass water flow sensor 79 on the bypass pipe 40.
Referring to fig. 7, an embodiment of the present invention further provides a control device for a gas water heater, where the control device is applied to the gas water heater shown in fig. 1. The method may be applied to the controller 10 of the gas water heater shown in fig. 1. The burner 50 of the gas water heater obtains gas through the gas inlet, and the gas is combusted in the burner 50 to heat the water flow in the heat exchanger 60, so as to generate hot water. A bypass pipe 40 is arranged between the water outlet pipe 20 and the water inlet pipe 30 of the gas water heater. The bypass pipe 40 is provided with a water proportional valve 41 and a water switching valve 43. The water switching valve 43 is used to control the opening and closing of the bypass pipe 40. The water proportional valve 41 is used for adjusting the water flow of the bypass pipe 40, and the opening degree of the water proportional valve 41 influences the water flow of the bypass pipe 40. When the water switching valve 43 is opened, the bypass pipe 40 is closed by the water proportional valve 41 being at the minimum opening degree, and the bypass pipe 40 is fully conducted by the water proportional valve 41 being at the maximum opening degree. The control device of the gas water heater includes a first control module 110 and a second control module 130. The first control module is used for controlling the water switch valve 43 to be opened and adjusting the opening of the water proportional valve 41 according to the target bypass water flow if the water switch valve 43 is closed, the water proportional valve 41 is in the maximum opening and the water temperature rise occurs, so that the outlet water temperature of the gas water heater is the same as the set temperature. The second control module is used for controlling the water switch valve 43 to be closed and adjusting the water proportional valve 41 to be in the maximum opening degree after the water temperature rise condition is finished.
Based on the control device of the gas water heater in the embodiment, the bypass pipe 40 of the gas water heater is simultaneously provided with the water switch valve 43 and the water proportional valve 41, and the water switch valve 43 controls the on-off of the bypass pipe 40, so that the water proportional valve 41 can be adjusted to a proper opening degree from the maximum opening degree, the bypass pipe 40 is ensured to neutralize hot water with the maximum water flow and the overhigh temperature when the water temperature rise condition is just started, the delay problem when the temperature rise is reduced is favorably prevented, and the water proportional valve 41 can be in a proper opening degree to avoid the obvious water temperature fluctuation caused by overlarge flow. Furthermore, the invention can quickly and accurately reduce the temperature rise of the water, so that the water outlet temperature of the gas water heater is the same as the set temperature, the scalding risk and the use discomfort caused by the temperature rise of the water are prevented, and the use experience and the use safety of the gas water heater are greatly improved.
In one embodiment, the control apparatus of the gas water heater further comprises a target bypass water flow determination module. The target bypass water flow determination module is used for determining a load to be neutralized according to the outlet water temperature and the set temperature of the heat exchanger 60 of the gas water heater and the inlet water flow of the gas water heater, and determining the target bypass water flow according to the load to be neutralized, the inlet water temperature of the gas water heater and the set temperature.
In one embodiment, the control device of the gas water heater further comprises a water use condition occurrence judging module. The water consumption condition occurrence judging module is used for judging that the water consumption temperature rise condition occurs if the water outlet temperature of the heat exchanger 60 of the gas water heater is greater than a first preset temperature.
In one embodiment, the water use temperature increase event comprises a water flow sudden temperature increase event. The water consumption condition occurrence judging module is further used for judging that the water flow sudden change temperature rise condition occurs if the reduction of the water inlet flow of the gas water heater in the first preset time is larger than a preset threshold and the water outlet temperature rise of the gas water heater is larger than a preset temperature rise.
In one embodiment, the control device of the gas water heater further comprises a water use condition end judgment module. The water consumption condition ending judging module is used for judging that the water consumption temperature rise condition is ended if the water outlet temperature of the heat exchanger 60 of the gas water heater is lower than a second preset temperature.
In one embodiment, the first control module is further configured to control the water switch valve 43 to open and adjust the duration of the opening of the water proportional valve 41 according to the target bypass water flow rate to be greater than a second preset time.
In one embodiment, the first control module is further configured to control the water switch valve 43 to close, adjust the water proportional valve 41 to the maximum opening degree, and perform hot water temperature control according to the outlet water temperature and the set temperature of the gas water heater after the water temperature rise condition is over.
For specific limitations of the control device of the gas water heater, reference may be made to the above limitations of the control method of the gas water heater, which are not described herein again. The modules in the control device of the gas water heater can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A control method of a gas water heater is characterized in that a bypass pipe is arranged between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a water proportional valve and a water switch valve, the water switch valve is used for controlling the on-off of the bypass pipe, the water proportional valve is used for regulating the water flow of the bypass pipe, and the control method of the gas water heater comprises the following steps:
if the water switch valve is closed, the water proportional valve is in the maximum opening degree and the water use temperature rises, controlling the water switch valve to open and adjusting the opening degree of the water proportional valve according to the target bypass water flow so as to enable the water outlet temperature of the gas water heater to be the same as the set temperature and judging whether the water use condition is finished or not;
and after the water temperature rise condition is finished, controlling the water switch valve to be closed and adjusting the water proportional valve to be in the maximum opening degree.
2. The control method of a gas water heater according to claim 1, wherein the target bypass water flow rate is determined by the steps of:
determining a load to be neutralized according to the outlet water temperature of the heat exchanger of the gas water heater, the set temperature and the inlet water flow of the gas water heater;
and determining the target bypass water flow according to the load to be neutralized, the inlet water temperature of the gas water heater and the set temperature.
3. The method for controlling a gas water heater according to claim 1, wherein the step of controlling the opening of the water switch valve and adjusting the opening of the water proportional valve according to the target bypass water flow rate so as to make the outlet water temperature of the gas water heater the same as the set temperature comprises the steps of, if the water switch valve is closed, the water proportional valve is at the maximum opening degree and the water temperature rise occurs:
and if the water outlet temperature of the heat exchanger of the gas water heater is higher than a first preset temperature, judging that the water temperature rise condition occurs.
4. The control method of a gas water heater according to claim 1, wherein said water use temperature rise condition comprises a water flow sudden temperature rise condition; if the water switch valve is closed, the water proportional valve is in the maximum opening degree and the water temperature rise occurs, the step of controlling the water switch valve to be opened and adjusting the opening degree of the water proportional valve according to the target bypass water flow so as to enable the outlet water temperature of the gas water heater to be the same as the set temperature comprises the following steps:
and if the reduction of the water inlet flow of the gas water heater in the first preset time is greater than a preset threshold value and the water outlet temperature rise of the gas water heater is greater than a preset temperature rise, judging that the water flow sudden change temperature rise condition occurs.
5. The method of claim 1, wherein the step of determining whether the water usage condition is over includes:
and if the water outlet temperature of the heat exchanger of the gas water heater is lower than a second preset temperature, judging that the water temperature rise condition is finished.
6. The control method of the gas water heater according to claim 1, wherein the duration of controlling the water switch valve to open and adjusting the opening of the water proportional valve according to the target bypass water flow is longer than a second preset time.
7. The control method of the gas water heater according to claim 1, wherein the controlling the water switch valve to be closed and the water proportional valve to be at the maximum opening after the water temperature rise condition is over further comprises:
and after the water temperature rise condition is finished, controlling the water switch valve to be closed, adjusting the water proportional valve to be in the maximum opening degree, and controlling the hot water temperature according to the outlet water temperature of the gas water heater and the set temperature.
8. A gas water heater, comprising:
a water inlet pipe and a water outlet pipe;
the bypass pipe is arranged between the water inlet pipe and the water outlet pipe;
the water switch valve is arranged on the bypass pipe and used for controlling the on-off of the bypass pipe;
the water proportional valve is arranged on the bypass pipe and used for adjusting the water flow of the bypass pipe;
a controller connected to the water switch valve and the water proportional valve, comprising a memory storing a computer program and a processor implementing the steps of the method of controlling a gas water heater according to any one of claims 1 to 7 when the processor executes the computer program.
9. The gas water heater of claim 8, further comprising:
the water inlet flow sensor is arranged on the water inlet pipe and used for acquiring the water inlet flow of the gas water heater;
the water inlet temperature sensor is arranged on the water inlet pipe and used for acquiring the water inlet temperature of the gas water heater;
the water outlet temperature sensor is arranged on the water outlet pipe and used for acquiring the water outlet temperature of the gas water heater;
and the temperature rise sensor is arranged at the water outlet of the heat exchanger of the gas water heater and used for acquiring the water outlet temperature of the heat exchanger of the gas water heater.
10. A control device of a gas water heater, wherein a bypass pipe is arranged between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a water proportional valve and a water switch valve, the water switch valve is used for controlling the on-off of the bypass pipe, the water proportional valve is used for adjusting the water flow of the bypass pipe, and the control device of the gas water heater comprises:
the first control module is used for controlling the water switch valve to be opened and adjusting the opening of the water proportional valve according to target bypass water flow if the water switch valve is closed, the water proportional valve is in the maximum opening and the water temperature rise occurs, so that the water outlet temperature of the gas water heater is the same as the set temperature;
and the second control module is used for controlling the water switch valve to be closed and adjusting the water proportional valve to be in the maximum opening degree after the water temperature rise condition is finished.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116123318A (en) * | 2023-02-16 | 2023-05-16 | 江门市碧源五金制造有限公司 | Faucet water outlet control method, control system and storage medium |
| CN116123318B (en) * | 2023-02-16 | 2024-05-14 | 江门市碧源五金制造有限公司 | Faucet water outlet control method, control system and storage medium |
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| CN113983682B (en) | 2023-07-04 |
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