CN113983682B - 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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- CN113983682B CN113983682B CN202111431728.6A CN202111431728A CN113983682B CN 113983682 B CN113983682 B CN 113983682B CN 202111431728 A CN202111431728 A CN 202111431728A CN 113983682 B CN113983682 B CN 113983682B
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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
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The application relates to a gas water heater and a control method and device thereof. 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 switching valve, the water switching valve is used for controlling the switch 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 at the maximum opening degree and the water temperature rise condition occurs, controlling the water switch valve to be opened, adjusting the opening degree of the water proportional valve according to the target bypass water flow rate so that the water outlet temperature of the gas water heater is the same as the set temperature, and judging whether the water consumption condition is ended; after the water temperature is increased, the water switch valve is controlled to be closed and the water proportional valve is regulated to be at the maximum opening. The control method of the gas water heater prevents scalding risks and use discomfort brought to users by water temperature rise, and greatly improves the use experience and 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 a control device thereof.
Background
The gas water heater takes gas as fuel, and transfers heat to the heat exchanger in a combustion heating mode, and heat exchange with cold water is realized in the heat exchanger, so that the purpose of preparing hot water is achieved. 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 the scenes such as bathrooms, kitchens and the like needing hot water.
The problem that the water outlet temperature is far higher than the set temperature can occur in the conditions of water pressure fluctuation, pause, continuous use of hot water and the like of the gas water heater in the prior art, so that scalding to users is caused.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a control method of the gas water heater, which can eliminate the water temperature rise condition of the gas water heater and prevent users from being scalded.
The second technical problem to be solved by the invention is to provide the gas water heater, which can eliminate the water temperature rise condition of the gas water heater and prevent users from being scalded.
The third technical problem to be solved by the invention is to provide a control device of the gas water heater, which can eliminate the water temperature rise condition of the gas water heater and prevent users from being scalded.
The first technical problem is solved by the following technical scheme:
a control method of a gas water heater, there is a bypass pipe between water outlet pipe and water inlet pipe of the gas water heater, the bypass pipe has water proportional valve and water on-off valve, the water on-off valve is used for controlling the switch of the bypass pipe, the water proportional valve is used for regulating the water flow of the bypass pipe, the control method of the gas water heater includes: if the water switch valve is closed, the water proportional valve is at the maximum opening degree and the water temperature rise condition occurs, controlling the water switch valve to be opened, adjusting the opening degree of the water proportional valve according to the target bypass water flow rate so that the water outlet temperature of the gas water heater is the same as the set temperature, and judging whether the water consumption condition is ended; after the water temperature is increased, the water switch valve is controlled to be closed and the water proportional valve is regulated to be at the maximum opening.
According to the control method of the gas water heater, the water switch valve and the water proportional valve are arranged at the bypass pipe of the gas water heater, and the water switch valve is used for controlling the switch of the bypass pipe, so that the water proportional valve can be adjusted to a proper opening degree from the maximum opening degree, the bypass pipe is enabled to neutralize hot water with overhigh temperature by the maximum water flow rate when the water temperature rise condition is just started, the delay problem when the temperature rise is reduced is avoided, and the water proportional valve is enabled to be in a proper opening degree so as to avoid obvious water temperature fluctuation caused by overhigh flow rate. The invention can rapidly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing scalding risks and use discomfort brought to users by the water temperature rise and greatly improving the use experience and use safety of the gas water heater.
In one embodiment, the target bypass water flow is determined by: determining a load to be neutralized according to the outlet water temperature, the set temperature and the inlet water flow of the heat exchanger of the gas water heater; and determining the target bypass water flow according to the load to be neutralized and the water inlet temperature and the set temperature of the gas water heater.
In one embodiment, if the water switch valve is closed, the water proportional valve is at a maximum opening degree and the water temperature rises, 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 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 temperature rise condition comprises a water flow abrupt temperature rise condition; if the water switch valve is closed, the water proportional valve is at the maximum opening degree and the water temperature rises, the water switch valve is controlled to be opened, and the opening degree of the water proportional valve is regulated 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: if the reduction of the water inflow of the gas water heater in the first preset time is larger than a preset threshold value and the water outflow temperature rise of the gas water heater is larger than a preset temperature rise, judging that the water flow abrupt change temperature rise condition occurs.
The water outlet temperature of the gas water heater is monitored through the sensor, and the water outlet temperature of the heat exchanger of the gas water heater can be monitored only after the high temperature water is generated, so that a user can still have a risk of being scalded, and whether the gas water heater needs to be started or not is judged according to the water outlet temperature of the heat exchanger of the gas water heater, and the gas water heater also has certain hysteresis. In the embodiment, the temperature rise of water is calculated to judge, so that the time for waiting for the temperature to be detected or waiting for the temperature to rise is saved, and the response efficiency is greatly improved.
In one embodiment, the step of determining whether the water use condition is over comprises: if the outlet water temperature of the heat exchanger of the gas water heater is smaller than the second preset temperature, the water temperature rise condition is judged to be ended.
In one embodiment, the water switch valve is controlled to be opened and the duration of the opening of the water proportional valve is adjusted according to the target bypass water flow rate is greater than a second preset time.
The lower limit value of the opening time is set for the opening of the bypass pipe, so that the problem that the water switch valve is frequently opened and closed is avoided.
In one embodiment, after the water temperature rise condition is finished, controlling the water switch valve to close and adjusting the water proportional valve to the maximum opening degree further comprises: after the water temperature is increased, the water switch valve is controlled to be closed, the water proportional valve is regulated to be the maximum opening degree, and the hot water temperature is controlled according to the water outlet temperature and the set temperature of the gas water heater.
After the water temperature rises, the temperature sensor is switched, hot water temperature control is performed 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 performed 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 scheme:
a gas water heater comprising: a water inlet pipe and a water outlet pipe; a bypass pipe 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 switch 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; the controller is connected with the water switch valve and the water proportional valve and comprises a memory and a processor, wherein 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 the gas water heater in this embodiment, water switch valve and water proportional valve have been set up simultaneously at gas water 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, guarantees that the bypass pipe just begins with maximum water flow and the too high hot water of temperature at water temperature rise condition, helps preventing the time delay problem when temperature rise reduces, can make this water proportional valve be in more suitable aperture in order to avoid the too big temperature fluctuation that causes of flow again. The invention can rapidly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing scalding risks and use discomfort brought to users by the water temperature rise and greatly improving the use experience and use safety of the gas water heater.
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 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; the temperature rise sensor is arranged at the water outlet of the heat exchanger of the gas water heater and is 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: a control device of a gas water heater, 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 switching valve, the water switching valve is used for controlling the switch 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 the target bypass water flow if the water switch valve is closed, the water proportional valve is at the maximum opening and the water temperature rises, 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 at 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 of the gas water heater is provided with the water switch valve and the water proportional valve, and the water switch valve is used for controlling the switch of the bypass pipe, 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 just at the beginning of the water temperature rise condition, the delay problem during temperature rise reduction is avoided, and the water proportional valve can be in a proper opening degree to avoid obvious water temperature fluctuation caused by overhigh flow. The invention can rapidly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing scalding risks and use discomfort brought to users by the water temperature rise and greatly improving the use experience and use safety of the gas water heater.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a gas water heater according to one embodiment;
FIG. 2 is a flow chart of a method of controlling a gas water heater according to one embodiment;
FIG. 3 is a schematic flow diagram of obtaining a target bypass water amount in one embodiment;
FIG. 4 is a flow chart of a control method of a gas water heater according to another embodiment;
FIG. 5 is a flow chart of a control method of a gas water heater according to another embodiment;
FIG. 6 is a schematic diagram of a gas water heater according to another embodiment;
FIG. 7 is a block diagram of a control device of a gas water heater according to an embodiment;
reference numerals illustrate: 10-controller, 20-outlet pipe, 30-inlet pipe, 40-bypass pipe, 41-water proportional valve, 43-water switch valve, 50-combustor, 60-heat exchanger, 71-inflow flow sensor, 73-inflow temperature sensor, 75-outflow temperature sensor, 77-temperature rise sensor, 79-bypass water flow sensor, 80-check valve, 110-first control module, 130-second control module.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described 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 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 the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
Spatially relative terms, such as "under", "below", "beneath", "under", "above", "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 and 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 "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (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 should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
As the background technology, the water temperature rise condition of the gas water heater in the prior art exists, and the inventor researches and discovers that the common water temperature rise condition comprises a water cut-off temperature rise condition and a water flow mutation temperature rise condition. The water-stopping temperature rise condition refers to the condition that a user pauses use in the water using process and then continues to use water, and because the gas water heater heats the heat exchanger through gas combustion and utilizes heat generated by the gas combustion to generate hot water, when the user pauses use, the temperature of the heat exchanger is still higher, and the residual temperature of the heat exchanger can continuously heat the water retained in the heat exchanger to enable the water to continue to rise, so that the water-stopping temperature rise is generated beyond the set temperature. When the water cut-off temperature rise is not reduced and the water heater is used again, high-temperature water flows out from the water heater, so that the water outlet temperature of the gas water heater is greatly increased compared with the set temperature of a user. The abrupt water flow temperature rise condition refers to that when the water supply pressure of the gas water heater suddenly decreases, a certain time is needed 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 a gas inlet, and the gas is burned in the burner 50 to heat the water flow in the heat exchanger 60, thereby realizing the generation of hot water. A bypass pipe 40 is provided between the outlet pipe 20 and the 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 switching of the bypass pipe 40. The water proportional valve 41 is used to regulate the water flow of the bypass pipe 40, and the opening of the water proportional valve 41 will affect 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, and the bypass pipe 40 is fully opened by the water proportional valve 41 being at the maximum opening. As shown in fig. 2, the control method of the gas water heater includes step S202 and step S204.
S202, if the water switch valve 43 is closed, the water proportional valve 41 is at the maximum opening degree and the water temperature rise condition occurs, the water switch valve 43 is controlled to be opened, the opening degree of the water proportional valve 41 is regulated according to the target bypass water flow rate, so that the water outlet temperature of the gas water heater is the same as the set temperature, and whether the water consumption condition is ended is judged.
It will be appreciated that when the gas water heater is in a water temperature rise condition, cold water is introduced through the bypass pipe 40 to mix with superheated water flowing out of the gas water heater heat exchanger 60 to reduce the water temperature, in response to the water temperature rise condition. However, since a certain time is required for adjusting the opening degree of the water proportional valve 41, the bypass pipe 40 needs to be adjusted from the minimum opening degree only by controlling the bypass pipe 40 by the water proportional valve 41, which results in that the bypass pipe 40 can output a small water flow when the water temperature rise occurs, and the neutralization capability of the hot water with the too high temperature is weak, and the hot water with the too high temperature may still be output to the user. Therefore, in this embodiment, the water switch valve 43 is additionally provided, 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 at the maximum opening, so that, based on this structure, when the water temperature rise occurs, the bypass pipe 40 of the water switch valve 43 can neutralize the hot water with the excessively high temperature at the maximum water flow rate, so that the situation that the water temperature is overheated due to insufficient neutralizing capability of the hot water in the opening adjustment 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 required to be used, if the water switching valve 43 is not at the maximum opening, the opening of the water switching valve 43 is adjusted to the maximum opening. For example, when the user stops using hot water, the opening degree of the water opening/closing valve 43 is detected, and if the opening degree of the water opening/closing valve 43 is not at the maximum opening degree, the opening degree of the water opening/closing valve 43 is automatically adjusted to the maximum opening degree.
The target bypass water flow refers to the water flow of the bypass pipe 40 when the outlet water temperature of the gas water heater is matched with the set temperature. After the opening of the water proportional valve 41 is adjusted according to the target bypass water flow, hot water with higher temperature and cold water with the target bypass water flow, which are output by heat exchange of the gas water heater, are mixed, so that the outlet water temperature of the gas water heater is set. At this time, whether the water temperature rise is ended is monitored, and if the water temperature rise is not ended, the cold water of the target bypass water flow rate is maintained to be output through the bypass pipe 40. If the water temperature rise is completed, the process proceeds to step S204.
S204, after the water temperature rise is completed, the water opening/closing valve 43 is controlled to close and the water proportional valve 41 is adjusted to the maximum opening.
It can be understood that after the water temperature rise is finished, the hot water output by the heat exchanger 60 is neutralized by the cold water output by the bypass pipe 40, and the gas water heater can output the hot water with the set temperature by controlling the heat load. In order to ensure the capability of the subsequent gas water heater to cope with the water temperature rise, the water proportional valve 41 needs to be adjusted to the maximum opening in addition to the closing of the bypass pipe 40 by controlling the water switching valve 43, so that the water proportional valve 41 can be adjusted from the maximum opening when the next water temperature rise occurs.
Based on the control method of the gas water heater in this embodiment, the bypass pipe 40 of the gas water heater is provided with the water switching valve 43 and the water proportional valve 41 at the same time, and the water switching valve 43 controls the switching of the bypass pipe 40, so that the water proportional valve 41 can be adjusted to a proper opening from the maximum opening, the bypass pipe 40 is ensured to neutralize hot water with the maximum water flow and the excessive temperature just at the beginning of the water temperature rise, the delay problem when the temperature rise is reduced is avoided, and the water proportional valve 41 can be in a proper opening to avoid obvious water temperature fluctuation caused by the excessive flow. The invention can quickly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing the scalding risk and the use discomfort brought by the water temperature rise to the user, and greatly improving the use experience and the use safety of the gas water heater.
In one embodiment, as shown in FIG. 3, the target bypass water flow is determined by step S302 and step S304.
S302, determining the load to be neutralized according to the outlet water temperature, the set temperature and the inlet water flow of the gas water heater of the heat exchanger 60 of the gas water heater.
It will be appreciated that the load required to change water from one temperature to the other is positively correlated to the difference between the two temperatures and the weight of the water, as known from the specific heat capacity equation. Wherein, the weight of water 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 load to be neutralized required to reduce the hot water having a higher temperature outputted from 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 inflow water flow rate of the gas water heater. The outlet water temperature of the heat exchanger 60 of the gas water heater can be obtained by a temperature rise sensor provided at the hot water output end of the heat exchanger 60 of the gas water heater, and the inlet water flow rate of the gas water heater can be obtained by a inlet water flow rate sensor provided at the inlet pipe 30.
S304, determining target bypass water flow according to the load to be neutralized, the water inlet 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 water inlet temperature of the gas water heater, and the cold water with the target bypass water flow rate can be lifted to the set temperature by the load to be neutralized. Similar to the principle in step S302, the target bypass water flow rate can be determined according to the load to be neutralized, the water inlet 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 inlet water temperature of the gas water heater can be obtained by an inlet water temperature sensor provided at the inlet pipe 30.
In one particular embodiment, the steps in FIG. 3 may be performed by the following formula:
wherein L is P For the target bypass water flow, T high Water outlet temperature, T, of heat exchanger 60 of the gas water heater set To set the temperature, L in Is the water inflow flow of the gas water heater, T in Is the water inlet temperature of the gas water heater. (T) high -T set )×L in Namely 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 outlet water temperature of the heat exchanger 60 of the gas water heater is greater than the first preset temperature, the water temperature rise condition is judged to occur.
It is understood that the first preset temperature may be set according to actual needs. The water temperature rise condition comprises a water cut-off temperature rise condition and a water flow mutation temperature rise condition. For the water cut-off temperature rise situation, 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 waste heat of the heat exchanger 60 after the user pauses the water consumption, the expected water cut-off temperature corresponding to each set temperature can be measured through experiments, and the cooling speed of the water can be calculated according to the room temperature to calculate the expected water cut-off temperature corresponding to each set temperature. If the outlet water temperature of the heat exchanger 60 of the gas water heater is higher than the expected water cut-off temperature, it is considered that the water cut-off temperature rise will occur, and thus the first preset temperature is set to a value higher than the expected water cut-off temperature. Since a certain time is required for heating the water by the waste heat of the heat exchanger 60 and adjusting the opening of the water proportional valve 41, the first preset temperature is set to a value lower than the set temperature, so 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 for coping with the water temperature rise is increased. For the water cut-off temperature rise situation, in one specific embodiment, the first preset temperature is a value less than 5 ℃ of the set temperature. In one embodiment, if the determination is made in step S402 for the abrupt water flow temperature increase, the first preset temperature should be higher than the set temperature because the heating of less water at a higher load will result in the water outlet temperature of the heat exchanger being higher than the set temperature because the load is not reduced until the water flow is suddenly reduced.
S404, if the water switch valve 43 is closed, the water proportional valve 41 is at the maximum opening and the water temperature rise occurs, the water switch valve 43 is controlled to be opened, and the opening of the water proportional valve 41 is adjusted according to the target bypass water flow, so that the water outlet temperature of the gas water heater is the same as the set temperature, and whether the water consumption condition is ended is judged.
Step S404 is the same as step S202, and reference is made to the above.
S406, after the water temperature rise is completed, the water opening/closing valve 43 is controlled to close and the water proportional valve 41 is adjusted to the maximum opening.
Step S406 is the same as step S204, and reference is made to the above.
In one embodiment, the water temperature rise condition includes a water flow abrupt 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 inflow of the gas water heater in the first preset time is larger than a preset threshold value and the water outflow temperature rise of the gas water heater is larger than a preset temperature rise, judging that the water flow abrupt change temperature rise condition occurs.
It can be understood that, aiming at the abrupt temperature rise of water flow, the water inflow of the gas water heater is monitored in real time, and when the water inflow of the gas water heater suddenly decreases, the water outflow temperature of the gas water heater may be too high. In order to further determine whether the temperature rise problem occurs, whether the bypass pipe 40 needs to be opened or not may be determined according to the difference between the current load of the gas water heater and the load before the first preset time and the water outlet temperature rise of the gas water heater, and according to the comparison result of the water outlet temperature rise and the preset temperature rise. The temperature of the water discharged from the gas water heater is monitored by the sensor, and the water can be monitored only after the high temperature water is generated, so that the user may still have a risk of being scalded, and whether the starting is required or not is judged by using the mode in the step S402, and the method has certain hysteresis. In the embodiment, the temperature rise of water is calculated to judge, so that the time for waiting for the temperature to be detected or waiting for the temperature to 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 at the maximum opening degree and the water flow abrupt temperature rise 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 rate, so that the water outlet temperature of the gas water heater is the same as the set temperature, and whether the water consumption condition is ended is judged.
Step S504 is similar to step S202, and reference is made to the above.
S506, after the abrupt water flow temperature rise condition is finished, the water switching valve 43 is controlled to be closed, and the water proportional valve 41 is adjusted to be at the maximum opening.
Step S506 is similar to step S204, and reference is made to the above.
In one embodiment, the calculation of the water temperature increase may be performed by the following formula:
wherein DeltaT is the temperature rise of the water outlet and Load 1 Load of the gas water heater before a first preset time 2 For the current load of the gas water heater, L in Is the water inflow of the gas water heater.
In one embodiment, the first preset time is 3 seconds and the preset threshold is 1L/min. The preset temperature was raised to 3 ℃.
In one embodiment, the step of determining whether the water use condition is over comprises: if the outlet water temperature of the heat exchanger 60 of the gas water heater is smaller than the second preset temperature, the water temperature rise condition is judged to be ended. It will be appreciated that the outlet water temperature of the heat exchanger 60 of the gas water heater being less than the second preset temperature means that the waste heat of the heat exchanger 60 has been consumed or that the water flow fluctuation has disappeared, and that the heat exchanger 60 does 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 water switching valve 43 is controlled to be opened and the duration of the opening degree of the water proportional valve 41 is adjusted according to the target bypass water flow rate is greater than the second preset time. It will be appreciated that, in order to ensure the sensitivity of starting the bypass pipe 40, there may occur a case where the first preset temperature is set to be less than the second preset temperature, which will cause the controller 10 to immediately determine that the water temperature rise condition is ended just after determining that the water temperature rise is not equal to an excessively high value, so that the water switching valve 43 is frequently opened and closed, so that the present embodiment sets the opening time lower limit value for the opening of the bypass pipe 40 to avoid the occurrence of the above-described problem. In one embodiment, the second preset time is 5 seconds.
In one embodiment, after the water temperature rise condition is finished, controlling the water switching valve 43 to close and adjust the water proportional valve 41 to the maximum opening degree further includes: after the water temperature rise is completed, the water switching valve 43 is controlled to be closed, the water proportional valve 41 is adjusted to the maximum opening degree, and the hot water temperature is controlled 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 program 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 the water temperature rise condition is dealt with, 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 is increased, 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, because the setting position of the water outlet temperature sensor is closer to the water end of the user than the setting position of the temperature rise sensor, 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 steps in the flowcharts of fig. 2-5 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps of fig. 2-5 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
Referring to fig. 1, the embodiment of the invention further provides a gas water heater. 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 switching valve 43, and a controller 10. A bypass pipe 40 is provided between the water inlet pipe 30 and the water outlet pipe 20. A water switching valve 43 is provided at the bypass pipe 40 for controlling the switching of the bypass pipe 40. A water proportional valve 41 is provided at the bypass pipe 40 for adjusting the water flow rate of the bypass pipe 40. The controller 10 is connected with the water switching 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 at the maximum opening and the water temperature rise condition occurs, the water switch valve 43 is controlled to be opened, the opening of the water proportional valve 41 is regulated according to the target bypass water flow, so that the water outlet temperature of the gas water heater is the same as the set temperature, and whether the water consumption condition is ended is judged; after the water temperature rise is completed, the water opening/closing valve 43 is controlled to close and the water proportional valve 41 is adjusted to the maximum opening.
In some embodiments, the steps of the control method embodiment of any one of the above gas water heaters are implemented when the processor executes the computer program.
Based on the gas water heater in this embodiment, the bypass pipe 40 of the gas water heater is provided with the water switch valve 43 and the water proportional valve 41 at the same time, and the water switch valve 43 controls the switch 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 excessive temperature just at the beginning of the water temperature rise, the delay problem of temperature rise reduction is avoided, and the water proportional valve 41 can be in a proper opening degree to avoid obvious water temperature fluctuation caused by the excessive flow. The invention can quickly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing the scalding risk and the use discomfort brought by the water temperature rise to the user, and greatly improving the use experience and the use safety of the gas water heater.
In one embodiment, referring to fig. 6, the gas water heater further includes a water inlet flow sensor 71, a water inlet temperature sensor 73, a water outlet temperature sensor 75, and a temperature rise sensor 77. The inflow sensor 71 is provided at the water inlet pipe 30 for acquiring inflow of the gas water heater. A water inlet temperature sensor 73 is provided at the water inlet pipe 30 for acquiring the water inlet temperature of the gas water heater. A water outlet temperature sensor 75 is provided at the water outlet pipe 20 for acquiring the water outlet temperature of the gas water heater. The temperature rise sensor 77 is disposed at the water outlet of the heat exchanger 60 of the gas water heater, and is used for acquiring the outlet water temperature of the heat exchanger 60 of the gas water heater. In some embodiments, the gas water heater may also be provided with a one-way 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 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 a gas inlet, and the gas is burned in the burner 50 to heat the water flow in the heat exchanger 60, thereby realizing the generation of hot water. A bypass pipe 40 is provided between the outlet pipe 20 and the 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 switching of the bypass pipe 40. The water proportional valve 41 is used to regulate the water flow of the bypass pipe 40, and the opening of the water proportional valve 41 will affect 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, and the bypass pipe 40 is fully opened by the water proportional valve 41 being at the maximum opening. The control device of the gas water heater comprises a first control module 110 and a second control module 130. The first control module is configured to control the water switch valve 43 to be opened and adjust 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 at 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 at the maximum opening degree after the water temperature rise condition is finished.
Based on the control device of the gas water heater in this embodiment, the bypass pipe 40 of the gas water heater is provided with the water switch valve 43 and the water proportional valve 41, and the water switch valve 43 controls the switch 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 excessive temperature just at the beginning of the water temperature rise, the delay problem when the temperature rise is reduced is avoided, and the water proportional valve 41 can be in a proper opening degree to avoid obvious water temperature fluctuation caused by the excessive flow. The invention can quickly and accurately reduce the water temperature rise so that the water outlet temperature of the gas water heater is the same as the set temperature, thereby preventing the scalding risk and the use discomfort brought by the water temperature rise to the user, and greatly improving the use experience and the use safety of the gas water heater.
In one embodiment, the control device of the gas water heater further comprises a target bypass water flow rate determination module. The target bypass water amount determining module is used for determining a load to be neutralized according to the outlet water temperature, the set temperature and the inlet water flow of the heat exchanger 60 of the gas water heater, and determining the target bypass water amount according to the load to be neutralized, the inlet water temperature and the set temperature of the gas water heater.
In one embodiment, the control device of the gas water heater further comprises a water consumption condition occurrence judging module. The water condition occurrence judging module is used for judging that water temperature rise 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 temperature increase condition includes a water flow abrupt temperature increase condition. The water consumption condition occurrence judging module is further used for judging that the water flow abrupt change temperature rise condition occurs if the reduction of the water inflow 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.
In one embodiment, the control device of the gas water heater further comprises a water consumption condition end judging module. The water condition ending judging module is used for judging that the water temperature rise condition is ended if the water outlet temperature of the heat exchanger 60 of the gas water heater is smaller than the second preset temperature.
In one embodiment, the first control module is further configured to control the water switching 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 the second preset time.
In one embodiment, the first control module is further configured to control the water switching valve 43 to close, adjust the water proportional valve 41 to a 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 finished.
The specific limitation of the control device of the gas water heater can be referred to the limitation of the control method of the gas water heater, and the description thereof is omitted herein. The above-mentioned various modules in the control device of the gas water heater can be implemented by all or part of software, hardware and their combination. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means 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, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (9)
1. The control method of the 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 switching valve, the water switching valve is used for controlling the switching 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 at the maximum opening degree and the water temperature rises, controlling the water switch valve to be opened, 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 consumption is finished;
after the water temperature rise condition is finished, controlling the water switch valve to be closed and regulating the water proportional valve to be the maximum opening; when the water proportional valve is at the maximum opening, the water flow rate of the bypass pipe is maximum;
wherein the water temperature rise condition comprises a water flow mutation temperature rise condition; if the water switch valve is closed, the water proportional valve is at the maximum opening degree and the water temperature rises, 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 inflow of the gas water heater in the first preset time is greater than a preset threshold value and the water outflow temperature rise of the gas water heater is greater than a preset temperature rise, judging that the water flow abrupt change temperature rise condition occurs.
2. The method of controlling a gas water heater according to claim 1, wherein the target bypass water flow rate is determined by:
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 water inlet temperature of the gas water heater and the set temperature.
3. The method according to claim 1, wherein if the water switching valve is closed, the water proportional valve is at a maximum opening degree, and a water temperature rise occurs, the method further comprises the steps of controlling the water switching valve to open and adjusting the opening degree of the water proportional valve according to a target bypass water flow rate so that the outlet water temperature of the gas water heater is the same as the set temperature:
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.
4. The method for controlling a gas water heater according to claim 1, wherein the step of judging whether the water consumption condition is ended comprises:
and if the outlet water temperature of the heat exchanger of the gas water heater is smaller than the second preset temperature, judging that the water temperature rise condition is ended.
5. The control method of a gas water heater according to claim 1, wherein the duration of controlling the water switching valve to be opened and adjusting the opening degree of the water proportional valve according to the target bypass water flow rate is greater than a second preset time.
6. The control method of a gas water heater according to claim 1, wherein after the water temperature rise is finished, controlling the water switching valve to be closed and adjusting the water proportional valve to a maximum opening degree 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 the maximum opening degree, and controlling the temperature of the hot water according to the water outlet temperature and the set temperature of the gas water heater.
7. A gas water heater, comprising:
a water inlet pipe and a water outlet pipe;
a bypass pipe 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 switch 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;
the controller is connected with the water switch valve and the water proportional valve, and comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the control method of the gas water heater according to any one of claims 1 to 6 when executing the computer program.
8. The gas water heater as recited in claim 7, 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;
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.
9. The utility model provides a controlling means of gas heater, its characterized in that is provided with the bypass pipe between outlet pipe and the inlet tube of gas heater, the bypass pipe is provided with water proportional valve and water switch valve, the water switch valve is used for controlling the switch of bypass pipe, the water proportional valve is used for adjusting the discharge of bypass pipe, gas heater's controlling means includes:
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 the target bypass water flow if the water switch valve is closed, the water proportional valve is at the maximum opening and the water temperature rises, so that the water outlet 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 to be closed and adjusting the water proportional valve to be at the maximum opening after the water temperature rise condition is finished; when the water proportional valve is at the maximum opening, the water flow rate of the bypass pipe is maximum;
wherein the water temperature rise condition comprises a water flow mutation temperature rise condition; the apparatus further comprises:
the water consumption condition occurrence judging module is used for judging that the water flow abrupt change temperature rise condition occurs when the reduction of the water inflow 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.
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| JPS61213437A (en) * | 1985-03-19 | 1986-09-22 | Sanyo Electric Co Ltd | Control method for water heater |
| CN1096586C (en) * | 1994-02-07 | 2002-12-18 | 松下电器产业株式会社 | Flow controlling valve and apparatus for supplying hot water |
| CN208108456U (en) * | 2018-04-27 | 2018-11-16 | 芜湖美的厨卫电器制造有限公司 | Gas heater |
| CN210154067U (en) * | 2019-01-02 | 2020-03-17 | 芜湖美的厨卫电器制造有限公司 | Gas water heater |
| CN110017612B (en) * | 2019-03-11 | 2021-02-26 | 华帝股份有限公司 | Constant temperature control method of gas water heater |
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