CN111059766A - Gas water heater and control method thereof - Google Patents
Gas water heater and control method thereof Download PDFInfo
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- CN111059766A CN111059766A CN201911198578.1A CN201911198578A CN111059766A CN 111059766 A CN111059766 A CN 111059766A CN 201911198578 A CN201911198578 A CN 201911198578A CN 111059766 A CN111059766 A CN 111059766A
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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 invention discloses a gas water heater, which comprises a heat exchanger, wherein the heat exchanger is respectively connected with a water inlet pipe and a water outlet pipe to form a water path; and the water mixing waterway is connected with the heat exchanger in parallel, a control valve for controlling the opening and closing of the waterway is arranged on the water mixing waterway, and a pump for adjusting the water inflow speed is arranged on the water inlet pipe. When the required heat load of the gas water heater is less than the minimum set value of the heat load, the water inlet of the heat exchanger of the gas water heater is shunted or the flow rate is increased, and the gas water heater is controlled to operate at the value which is more than the minimum set value of the heat load. By the control method, the gas water heater can adjust the outlet water temperature after combustion heat exchange by utilizing the increased water flow velocity, so that the gas water heater is suitable for the working condition with low heat load demand, and the application range of the gas water heater is widened.
Description
Technical Field
The invention relates to a gas water heater in the field of water heaters, in particular to a gas water heater applicable to low heat load requirements, and particularly relates to a control method applied to the gas water heater.
Background
Along with the requirement of a user on bathing water experience is improved, more and more users want to use lower temperature for bathing in summer, however, the inlet water temperature in summer is higher, and the water flow in some users is smaller, so that the problem that the water temperature is too high can still be generated even if the gas water heater works under the working conditions of lowest power and minimum heat load, and the outlet water temperature of a common gas water heater can exceed more than 40 degrees, so that the user experience can be seriously influenced.
In order to reduce the water outlet temperature of the gas water heater, the common practice in the industry at present is to increase the number of fire row sections of the gas water heater and adopt fewer fire rows for combustion as much as possible so as to reduce the combustion load and the heat load. However, the gas water heater adopting the above technical solution for increasing the number of fire rows divided has the following technical disadvantages:
1. in order to increase the number of fire row segments (for example, a three-segment is changed into a four-segment or a five-segment), the electromagnetic valve of the gas proportional valve needs to be increased, so that the universality of the proportional valve is poor, and the production cost is increased;
2. the excessive reduction of the fire row burning of the gas water heater is easy to generate condensed water in a combustion chamber, and the corrosion is generated on parts such as a heat exchanger, a burner and even a display, so that the reliability of the product is reduced;
3. as the number of the segments of the burner increases and the number of the fire rows burning in the minimum state decreases, the possibility of fire transmission failure is increased, the smoke exceeds the standard, and danger is generated;
4. when the water flow of a user is low, the load is large in the ignition process, so that the instantaneous water outlet temperature is high, and scalding danger is easily caused.
In view of the above, the present invention is particularly proposed. .
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a gas water heater to realize the controllable adjustment of the water inflow speed of the gas water heater, thereby achieving the purposes of improving the application range of the gas water heater and improving the heating efficiency.
In order to achieve the purpose of the invention, the basic concept of the technical scheme adopted by the invention is as follows:
a gas water heater comprises a heat exchanger, wherein the heat exchanger is respectively connected with a water inlet pipe and a water outlet pipe to form a water path; and the water mixing waterway is connected with the heat exchanger in parallel, a control valve for controlling the opening and closing of the waterway is arranged on the water mixing waterway, and a pump for adjusting the water inflow speed is arranged on the water inlet pipe.
Furthermore, two ends of the water mixing waterway are respectively connected with the water inlet pipe and the water outlet pipe; preferably, the mixed water channel is provided with a mixed water flow sensor for detecting the flow of water flowing through and a one-way valve for controlling the water flow in the mixed water channel to flow in a single direction.
Furthermore, a water inlet flow sensor for detecting the water inlet flow and a water inlet temperature sensor for detecting the water inlet temperature are arranged on the water inlet pipe; preferably, the inflow flow sensor and the inflow temperature sensor are both arranged at the upstream of the connection part of the water mixing waterway and the water inlet pipe.
Further, an outlet water temperature sensor for detecting the outlet water temperature is arranged on the outlet water pipe; preferably, the water outlet pipe is provided with a water outlet temperature sensor and a water mixing temperature sensor, the water outlet temperature sensor is arranged at the upstream of the connection part of the water mixing water path and the water outlet pipe, and the water mixing temperature sensor is arranged at the downstream of the connection part of the water mixing water path and the water outlet pipe.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the purpose of adjusting the controllable increase of the inflow speed of the gas water heater is achieved by additionally arranging the water pump on the water inlet pipe on the gas water heater, and then the controllable adjustment of the heat load required by the gas water heater is realized, so that the gas water heater does not need to work at the lowest load and can also obtain the effect of lower temperature of the outlet water.
The invention also provides a control method of the gas water heater, so as to achieve the purpose that the gas water heater can be suitable for low heat load requirements.
In order to achieve the purpose of the invention, the basic concept of the technical scheme adopted by the invention is as follows:
when the required heat load of the gas water heater is less than the minimum set value of the heat load, the water inlet of a heat exchanger of the gas water heater is shunted or the flow rate is increased, and the gas water heater is controlled to operate at the value which is more than the minimum set value of the heat load.
Further, the control method of the gas water heater is applied to the gas water heater.
Further, when the required heat load of the gas water heater is smaller than the minimum set value of the heat load, the inflow water flow rate of the gas water heater is detected; when the detection value is larger than the maximum set flow rate Vmax, part of the inlet water directly flows to a water outlet pipe of the gas water heater without being heated, and other inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater; when the detection value is less than the minimum set flow velocity Vmin, the water pump on the water inlet pipe is started, and the water inlet flow velocity of the gas water heater is increased.
Further, when the set outlet water temperature value of the gas water heater is lower than the first set value and the inlet water temperature is higher than the second set value, the gas water heater is in a state that the required heat load is smaller than the minimum set value of the heat load.
Further, the control method of the gas water heater specifically comprises the following steps,
step S1, starting the gas water heater;
step S2, detecting whether the outlet water set temperature of the gas water heater is lower than a first set value; if yes, go to step S3; otherwise, go to step S7;
step S3, detecting whether the water inlet temperature of the gas water heater is greater than a second set value; if yes, go to step S4; otherwise, go to step S7;
step S4, detecting the water inlet flow rate of the gas water heater;
when the inlet water flow rate detection value is larger than the maximum set flow rate Vmax, executing the step S5;
the inlet water flow rate detection value is smaller than the maximum set flow rate Vmax and larger than the minimum set flow rate Vmin, and step S7 is executed;
when the inlet water flow rate detection value is smaller than the minimum set flow rate Vmin, executing step S6;
step S5, opening a control valve arranged on a water mixing water path of the gas water heater and closing a water pump arranged on a water inlet pipe, wherein part of inlet water directly flows to a water outlet pipe through the water mixing water path, and the other part of inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater, so that the opening degree of a proportional valve of the gas water heater is controlled, and the gas water heater is controlled to operate in a state of being larger than the minimum set value of heat load;
step S6, closing a control valve arranged on a water mixing water path of the gas water heater, opening a water pump arranged on a water inlet pipe, increasing the water inlet flow rate of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load;
and S7, closing a control valve arranged on a water mixing water path of the gas water heater and a water pump arranged on a water inlet pipe, wherein all inlet water flows to a water outlet pipe after being heated by a heat exchanger of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load.
Further, detecting the gas water heater to obtain an inlet water temperature Tinlet and an inlet water flow rate Qinlet, and obtaining an outlet water set temperature Toutlet according to user selection or automatic generation of the water heater; the following formula is reused: and (4) obtaining the real-time heat load demand (water outlet set temperature Tout-water inlet temperature Tout) and water inlet flow rate Qin.
Further, the gas water heater adjusts a water pump arranged on the water inlet pipe, and controls the gas water heater to feed water at a corresponding flow rate; preferably, the water pump is provided with a plurality of different working gears, and the gas water heater respectively feeds water at corresponding flow speed when the water pump executes each working gear; preferably, all the working gears of the water pump are sequentially sequenced from bottom to top, and the water inlet flow rate of the gas water heater corresponding to the low working gear is lower than that of the gas water heater corresponding to the high working gear.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
by the control method, the gas water heater can adjust the outlet water temperature after combustion heat exchange by utilizing the increased water flow velocity, so that the gas water heater is suitable for the working condition with low heat load demand, and the application range of the gas water heater is widened. Particularly, the mode of improving the water inflow of the gas water heater is adopted, so that the gas water heater does not need to work at the lowest load, and a lower outlet water temperature can be obtained. Meanwhile, by the control method and the control device, the gas water heater can increase the heating efficiency and reduce the heating energy consumption by adopting a shunting mode when the inflow velocity is larger, so that the effect of reducing the power consumption of the gas water heater is achieved.
Meanwhile, the invention has simple structure, simple method and obvious effect and is suitable for popularization and use.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a gas water heater in an embodiment of the invention;
FIG. 2 is a schematic flow chart of a gas water heater control method according to embodiment 2 of the present invention;
FIG. 3 is a flow chart showing a control method of a gas water heater according to embodiment 3 of the present invention;
fig. 4 is a flow chart illustrating a method for controlling a gas water heater according to embodiment 4 of the present invention.
Description of main elements: the system comprises a water inlet pipe, a water outlet pipe, a heat exchanger, a water inlet flow sensor, a water inlet temperature sensor, a water outlet temperature sensor, a water pump, a water mixing waterway, a water mixing flow sensor, a water mixing control valve, a water mixing check valve and a water mixing temperature sensor, wherein the water inlet pipe, the water outlet pipe, the heat exchanger, the water inlet flow sensor, the water inlet temperature sensor, the water outlet temperature sensor, the water pump, the water mixing waterway, the water mixing flow sensor.
Detailed Description
Example 1
As shown in fig. 1, in the embodiment, a gas water heater is described, which includes a body, a heat exchanger 3 is installed in the body, two ends of the heat exchanger 3 are respectively connected to a water inlet pipe 1 and a water outlet pipe 2, and a water pump 7 for adjusting the flow rate of inlet water is installed on the water inlet pipe 1.
In this embodiment, the inlet pipe 1 of the gas water heater is provided with an inlet water temperature sensor 5 for detecting the inlet water temperature, the inlet pipe 1 is provided with an inlet water flow sensor 4 for detecting the inlet water flow rate, and the outlet pipe 2 is provided with an outlet water temperature sensor 6 for detecting the outlet water temperature. Preferably, for promoting the suitability, set gradually water pump 7, inflow flow sensor 4 and temperature sensor 5 of intaking along the rivers direction on inlet tube 1 to make only need install water pump 7 additional at the end of intaking of current ordinary gas heater's inlet tube 1, just can accord with the operation requirement on hardware.
Meanwhile, in the embodiment, the gas water heater is provided with the water mixing water path 8 connected with the heat exchanger 3 in parallel, and the water mixing control valve 10 for controlling the opening and closing of the water path is arranged on the water mixing water path 8, so that the water is divided by the water mixing water path when the flow rate of the water inflow water is too high, the water flow flowing through the heat exchanger is reduced, and the heating efficiency of the gas water heater is improved.
In this embodiment, two ends of the mixed water path 8 are respectively connected with the water inlet pipe 1 and the water outlet pipe 2; the mixed water channel 8 is provided with a mixed water flow sensor 9 for detecting the flow of water flowing through, a mixed water one-way valve 11 for controlling the water flow in the mixed water channel 8 to flow in one direction, and a mixed water control valve 10 for controlling the on-off of the mixed water channel 8. Preferably, a mixed water flow sensor 9, a water mixing one-way valve 11 and a water mixing control valve 10 are sequentially arranged on the mixed water path 8 along the water flow direction.
In this embodiment, the water inlet pipe 1 is provided with a water inlet flow sensor 4 for detecting water inlet flow and a water inlet temperature sensor 5 for detecting water inlet temperature; the water inlet flow sensor 4 and the water inlet temperature sensor 5 are both arranged at the upstream of the connection part of the water mixing waterway 8 and the water inlet pipe 1.
In this embodiment, the outlet pipe 2 is provided with an outlet temperature sensor 6 for detecting the outlet temperature; the water outlet pipe 2 is provided with a water outlet temperature sensor 6 and a mixed water temperature sensor 12, the water outlet temperature sensor 6 is arranged at the upstream of the connection part of the mixed water path 10 and the water outlet pipe 2, and the mixed water temperature sensor 12 is arranged at the downstream of the connection part of the mixed water path 10 and the water outlet pipe 2.
The purpose of adjusting the controllable increase of the inflow speed of the gas water heater is achieved by additionally arranging the water pump on the water inlet pipe on the gas water heater, and then the controllable adjustment of the heat load required by the gas water heater is realized, so that the gas water heater does not need to work at the lowest load and can also obtain the effect of lower temperature of the outlet water.
Example 2
As shown in fig. 2, in this embodiment, there is described a control method applied to the gas water heater described in embodiment 1, when the required heat load of the gas water heater is less than the minimum heat load setting value, the water inlet to the heat exchanger of the gas water heater is branched or the flow rate is increased, and the gas water heater is controlled to operate at a temperature greater than the minimum heat load setting value.
By the control method, the gas water heater can adjust the outlet water temperature after combustion heat exchange by utilizing the increased water flow velocity, so that the gas water heater is suitable for the working condition with low heat load demand, and the application range of the gas water heater is widened. Particularly, the mode of improving the water inflow of the gas water heater is adopted, so that the gas water heater does not need to work at the lowest load, and a lower outlet water temperature can be obtained. Meanwhile, by the control method and the control device, the gas water heater can increase the heating efficiency and reduce the heating energy consumption by adopting a shunting mode when the inflow velocity is larger, so that the effect of reducing the power consumption of the gas water heater is achieved.
In this embodiment, when the required heat load of the gas water heater is less than the minimum set value of the heat load, the inflow water flow rate of the gas water heater is detected; when the detection value is larger than the maximum set flow rate Vmax, part of the inlet water directly flows to a water outlet pipe of the gas water heater without being heated, and other inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater; when the detection value is less than the minimum set flow velocity Vmin, the water pump on the water inlet pipe is started, and the water inlet flow velocity of the gas water heater is increased.
In this embodiment, when the set outlet water temperature value of the gas water heater is lower than the first set value and the inlet water temperature is higher than the second set value, the gas water heater is in a state where the required heat load is smaller than the minimum set value of the heat load.
As shown in fig. 2, in this embodiment, the control method of the gas water heater specifically includes the following steps,
step S1, starting the gas water heater;
step S2, detecting whether the outlet water set temperature of the gas water heater is lower than a first set value; if yes, go to step S3; otherwise, go to step S7;
step S3, detecting whether the water inlet temperature of the gas water heater is greater than a second set value; if yes, go to step S4; otherwise, go to step S7;
step S4, detecting the water inlet flow rate of the gas water heater;
when the inlet water flow rate detection value is larger than the maximum set flow rate Vmax, executing the step S5;
the inlet water flow rate detection value is smaller than the maximum set flow rate Vmax and larger than the minimum set flow rate Vmin, and step S7 is executed;
when the inlet water flow rate detection value is smaller than the minimum set flow rate Vmin, executing step S6;
step S5, opening a control valve arranged on a water mixing water path of the gas water heater and closing a water pump arranged on a water inlet pipe, wherein part of inlet water directly flows to a water outlet pipe through the water mixing water path, and the other part of inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater, so that the opening degree of a proportional valve of the gas water heater is controlled, and the gas water heater is controlled to operate in a state of being larger than the minimum set value of heat load;
step S6, closing a control valve arranged on a water mixing water path of the gas water heater, opening a water pump arranged on a water inlet pipe, increasing the water inlet flow rate of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load;
and S7, closing a control valve arranged on a water mixing water path of the gas water heater and a water pump arranged on a water inlet pipe, wherein all inlet water flows to a water outlet pipe after being heated by a heat exchanger of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load.
Example 3
In this embodiment, a control method based on the gas water heater described in embodiment 2 is described, and the method further has the following distinguishing technical feature that when the required heat load of the gas water heater is smaller than the minimum heat load setting, the inflow rate of the gas water heater is increased.
By the control method, the gas water heater can adjust the outlet water temperature after combustion heat exchange by utilizing the increased water flow velocity, so that the gas water heater is suitable for the working condition with low heat load demand, and the application range of the gas water heater is widened. Meanwhile, by the control method and the control device, the gas water heater can obtain a lower outlet water temperature without working at the lowest load in a mode of improving the water inflow.
In this embodiment, the inlet water temperature T is obtained by detecting the gas water heaterIntoAnd inflow velocity QIntoAnd obtaining the set outlet water temperature T according to the selection of a user or the automatic generation of the water heaterGo out(ii) a The following formula is reused: required heat load (outlet water set temperature T)Go outInlet water temperature TInto) Water inflow rate QIntoAnd obtaining the real-time heat load required. Thereby, the water inlet temperature T of the gas water heater can be utilizedIntoFlow rate of inflow QIntoA set temperature T of water outletGo outThe real-time required heat load can be accurately obtained.
In this embodiment, gas heater adjusts the water pump of installing on the inlet tube to the operating parameter of control water pump adjusts the velocity of flow of intaking of gas heater, and then controls gas heater and intakes with the velocity of flow that corresponds, has realized carrying out the purpose of controllable adjustment to gas heater velocity of flow of intaking.
In this embodiment, the water pump of installing on gas heater inlet tube has a plurality of different work gears, and gas heater is intake with corresponding velocity of flow respectively when each work gear is carried out to the water pump. In the embodiment of the invention, all the working gears of the water pump are sequentially sequenced from bottom to top, and the water inlet flow rate of the gas water heater corresponding to the low working gear is lower than that of the gas water heater corresponding to the high working gear. That is, for convenience of description, the water pump has a first operating position, a second operating position … to an nth operating position (n is a positive integer greater than or equal to 2), and the water inlet flow rate V1 of the gas water heater corresponding to the first operating position is smaller than the water inlet flow rate V2 … of the gas water heater corresponding to the first operating position and is smaller than the water inlet flow rate Vn of the gas water heater corresponding to the nth operating position.
In this embodiment, after the required heat load of the gas water heater is smaller than the minimum set value of the heat load, the water pump is turned on to increase the inflow flow rate of the gas water heater until the adjusted required heat load is larger than the minimum set value of the heat load. Preferably, on the premise of ensuring that the adjusted required heat load is greater than the minimum set value of the heat load, the power consumption of the water pump needs to be reduced as much as possible, and the working gear of the water pump of the gas water heater is adjusted to be a proper corresponding value, so that the adjusted required heat load is just greater than the minimum set value of the heat load.
As shown in fig. 3, in the embodiment of the present invention, in order to achieve the purpose of reducing the power consumption of the water pump as much as possible, the operation process of the gas water heater specifically includes the following steps,
step S1, after the water pump is started, controlling the water pump to operate at the lowest working gear;
step S2, inflow rate Q of water to the gas water heaterIntoTemperature T of inlet waterIntoRespectively detecting to obtain the set water outlet temperature TGo outTo obtain the adjusted required heat load (set outlet water temperature T)Go outInlet water temperature TInto) Water inflow rate QInto；
Step S3, judging whether the adjusted demand heat load is larger than the minimum set value of the heat load; if not, go to step S4; if yes, go to step S5;
step S4, the working position of the water pump is raised to the first gear, and step S2 is executed again;
and step S5, keeping the water pump working continuously at the current gear.
In this embodiment, before the step S3 is executed, the water inlet flow rate Q of the gas water heater is requiredIntoTemperature T of inlet waterIntoRespectively detecting and setting the outlet water temperature TGo outTo obtain the adjusted required heat load (outlet water temperature T)Go outInlet water temperature TInto) Water inflow rate QIntoAnd comparing the calculated required heat load with a preset minimum heat load value to determine whether the next step is executedStep S3 or step S4.
Example 4
The present embodiment is based on the above embodiment 3, and has the following distinguishing technical features: the gas water heater is additionally provided with a self-learning program, after the gas water heater is installed, the water pump is started, the gas water heater runs at different working gears respectively, the water inlet flow speed of the gas water heater during running at each working gear is correspondingly detected, the water inlet flow speed of the gas water heater corresponding to each working gear of the water pump is obtained, and the water inlet flow speed detection values and the corresponding water pump gears are stored in a one-to-one correspondence mode. Therefore, the gas water heater can obtain the actual water inflow speed corresponding to different working gears of the water pump after being installed, the purpose of self-learning memory of different water inflow speeds of the gas water heater is further achieved, and the corresponding water inflow speed can be directly called after the working gear of the water pump is selected.
Preferably, in this embodiment, after the gas water heater is installed, the water pump is not started, and the inflow water velocity of the gas water heater is correspondingly detected to obtain the neutral inflow water velocity, so as to accurately obtain the inflow water velocity of the gas water heater when the water pump is not started.
As shown in fig. 4, in this embodiment, in order to achieve the purpose of reducing the power consumption of the water pump as much as possible, the operation process of the gas water heater specifically includes the following steps,
step S0, after the gas water heater is installed, executing a pre-learning program, and storing the inflow water flow rate corresponding to each working gear of the water pump in a one-to-one correspondence manner;
step S1, after the water pump is started, the water pump is controlled to operate at the lowest working gear;
step S2, calling the water inflow flow rate corresponding to the working gear of the water pump, and taking the called water inflow flow rate as QThen, carrying out the following steps;
step S3, temperature T of inlet water to the gas water heaterIntoDetecting to obtain the set outlet water temperature TGo outTo obtain the adjusted required heat load (set outlet water temperature T)Go outInlet water temperature TInto) Water inflow rate QInto；
Step S4, judging whether the adjusted demand heat load is larger than the minimum set value of the heat load; if not, go to step S5; if yes, go to step S6;
step S5, the working position of the water pump is raised to the first gear, and step S2 is executed again;
and step S6, keeping the water pump working continuously at the current gear.
In this embodiment, before the step S4 is executed, after the water pump operates at the corresponding gear, the corresponding inflow water flow rate stored in the pre-learning program in the system is automatically called, and the called inflow water flow rate is used as QIntoThen substituting the temperature into the formula and combining the detected water inlet temperature TIntoAnd setting the outlet water temperature TGo outAnd obtaining the adjusted required heat load.
Example 5
The present embodiment is based on the above embodiment 3 or 4, and further has the following technical features: the gas water heater is provided with a manual selection mode, so that a user can manually select the working gear of the water pump of the gas water heater.
In this embodiment, after the required heat load of the gas water heater is smaller than the minimum set value of the heat load, the water pump is turned on, and the user manually selects the operating gear of the water pump to control the water pump to operate according to the selected operating gear.
Preferably, in this embodiment, after the heat load required by the gas water heater is less than the minimum set value of the heat load, the gas water heater can only call part of the operating gears for the user to select, and the called operating gears need to satisfy the following conditions: the corresponding demand thermal load is greater than the thermal load minimum set point.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the spirit and scope of the present invention, and those skilled in the art can make various changes and modifications to the technical solution of the present invention without departing from the design concept of the present invention.
Claims (10)
1. A gas water heater comprises a heat exchanger, wherein the heat exchanger is respectively connected with a water inlet pipe and a water outlet pipe to form a water path; the method is characterized in that: and the water mixing waterway is connected with the heat exchanger in parallel, a control valve for controlling the opening and closing of the waterway is arranged on the water mixing waterway, and a pump for adjusting the water inflow speed is arranged on the water inlet pipe.
2. A gas water heater as defined in claim 1, wherein: two ends of the water mixing waterway are respectively connected with the water inlet pipe and the water outlet pipe; the mixed water channel is provided with a mixed water flow sensor for detecting the flow of water flowing through and a one-way valve for controlling the water flow in the mixed water channel to flow in a single direction.
3. A gas water heater according to claim 1 or 2, wherein: the water inlet pipe is provided with a water inlet flow sensor for detecting the water inlet flow and a water inlet temperature sensor for detecting the water inlet temperature; the water inlet flow sensor and the water inlet temperature sensor are both arranged at the upstream of the joint of the water mixing waterway and the water inlet pipe.
4. A gas water heater according to any one of claims 1 to 3, wherein: the water outlet pipe is provided with a water outlet temperature sensor for detecting the water outlet temperature; the water outlet pipe is provided with a water outlet temperature sensor and a mixed water temperature sensor, the water outlet temperature sensor is arranged at the upstream of the connection part of the mixed water path and the water outlet pipe, and the mixed water temperature sensor is arranged at the downstream of the connection part of the mixed water path and the water outlet pipe.
5. A control method applied to the gas water heater of any one of the above claims 1 to 4, characterized in that: when the required heat load of the gas water heater is smaller than the minimum set value of the heat load, the water inlet of the heat exchanger of the gas water heater is shunted or the flow rate is increased, and the gas water heater is controlled to operate at the value larger than the minimum set value of the heat load.
6. A gas water heater as defined in claim 5, wherein: when the required heat load of the gas water heater is smaller than the minimum set value of the heat load, detecting the inflow flow rate of the gas water heater;
when the detection value is larger than the maximum set flow rate Vmax, part of the inlet water directly flows to a water outlet pipe of the gas water heater without being heated, and other inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater;
when the detection value is less than the minimum set flow velocity Vmin, the water pump on the water inlet pipe is started, and the water inlet flow velocity of the gas water heater is increased.
7. A gas water heater as defined in claim 6, wherein: when the set outlet water temperature value of the gas water heater is lower than the first set value and the inlet water temperature is higher than the second set value, the gas water heater is in a state that the required heat load is smaller than the minimum set value of the heat load.
8. A gas water heater as defined in claim 7, wherein: the method specifically comprises the following steps of,
step S1, starting the gas water heater;
step S2, detecting whether the outlet water set temperature of the gas water heater is lower than a first set value; if yes, go to step S3; otherwise, go to step S7;
step S3, detecting whether the water inlet temperature of the gas water heater is greater than a second set value; if yes, go to step S4; otherwise, go to step S7;
step S4, detecting the water inlet flow rate of the gas water heater;
when the inlet water flow rate detection value is larger than the maximum set flow rate Vmax, executing the step S5;
the inlet water flow rate detection value is smaller than the maximum set flow rate Vmax and larger than the minimum set flow rate Vmin, and step S7 is executed;
when the inlet water flow rate detection value is smaller than the minimum set flow rate Vmin, executing step S6;
step S5, opening a control valve arranged on a water mixing water path of the gas water heater and closing a water pump arranged on a water inlet pipe, wherein part of inlet water directly flows to a water outlet pipe through the water mixing water path, and the other part of inlet water flows to the water outlet pipe after being heated by a heat exchanger of the gas water heater, so that the opening degree of a proportional valve of the gas water heater is controlled, and the gas water heater is controlled to operate in a state of being larger than the minimum set value of heat load;
step S6, closing a control valve arranged on a water mixing water path of the gas water heater, opening a water pump arranged on a water inlet pipe, increasing the water inlet flow rate of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load;
and S7, closing a control valve arranged on a water mixing water path of the gas water heater and a water pump arranged on a water inlet pipe, wherein all inlet water flows to a water outlet pipe after being heated by a heat exchanger of the gas water heater, controlling the opening degree of a proportional valve of the gas water heater, and controlling the gas water heater to operate in a state of being larger than the minimum set value of the heat load.
9. A gas water heater according to any one of claims 5 to 8, wherein: detecting a gas water heater to obtain an inlet water temperature T inlet and an inlet water flow rate Q inlet, and obtaining an outlet water set temperature T outlet according to user selection or automatic generation of the water heater; the following formula is reused: and (4) obtaining the real-time heat load demand (water outlet set temperature Tout-water inlet temperature Tout) and water inlet flow rate Qin.
10. The control method of a gas water heater according to any one of claims 5 to 9, characterized in that: the gas water heater adjusts a water pump arranged on the water inlet pipe and controls the gas water heater to feed water at a corresponding flow rate;
preferably, the water pump is provided with a plurality of different working gears, and the gas water heater respectively feeds water at corresponding flow speed when the water pump executes each working gear;
preferably, all the working gears of the water pump are sequentially sequenced from bottom to top, and the water inlet flow rate of the gas water heater corresponding to the low working gear is lower than that of the gas water heater corresponding to the high working gear.
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| CN201911198578.1A CN111059766A (en) | 2019-11-29 | 2019-11-29 | Gas water heater and control method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780426A (en) * | 2020-07-02 | 2020-10-16 | 广东万家乐燃气具有限公司 | Water flow control system and control method of gas water heater |
| CN112128987A (en) * | 2020-08-31 | 2020-12-25 | 华帝股份有限公司 | Method for controlling stable combustion of water heater and water heater |
| CN112524814A (en) * | 2020-12-03 | 2021-03-19 | 芜湖美的厨卫电器制造有限公司 | Temperature control device and method for gas water heater and gas water heater |
| CN112856810A (en) * | 2021-01-08 | 2021-05-28 | 宁波方太厨具有限公司 | Control system of heat exchanger, heating stove and outlet water temperature control method of heating stove |
| CN112963967A (en) * | 2021-03-05 | 2021-06-15 | 华帝股份有限公司 | Control method of water heater |
| CN114151976A (en) * | 2021-11-29 | 2022-03-08 | 广东万和新电气股份有限公司 | Gas water heater and blockage protection method and device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780426A (en) * | 2020-07-02 | 2020-10-16 | 广东万家乐燃气具有限公司 | Water flow control system and control method of gas water heater |
| CN112128987A (en) * | 2020-08-31 | 2020-12-25 | 华帝股份有限公司 | Method for controlling stable combustion of water heater and water heater |
| CN112524814A (en) * | 2020-12-03 | 2021-03-19 | 芜湖美的厨卫电器制造有限公司 | Temperature control device and method for gas water heater and gas water heater |
| CN112856810A (en) * | 2021-01-08 | 2021-05-28 | 宁波方太厨具有限公司 | Control system of heat exchanger, heating stove and outlet water temperature control method of heating stove |
| CN112963967A (en) * | 2021-03-05 | 2021-06-15 | 华帝股份有限公司 | Control method of water heater |
| CN114151976A (en) * | 2021-11-29 | 2022-03-08 | 广东万和新电气股份有限公司 | Gas water heater and blockage protection method and device thereof |
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