CN111238052A - Gas water heater and control method thereof - Google Patents
Gas water heater and control method thereof Download PDFInfo
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- CN111238052A CN111238052A CN202010063232.7A CN202010063232A CN111238052A CN 111238052 A CN111238052 A CN 111238052A CN 202010063232 A CN202010063232 A CN 202010063232A CN 111238052 A CN111238052 A CN 111238052A
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- water heater
- liquid level
- gas water
- gas
- drain pipe
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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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- 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
- F24H9/0005—Details for water heaters
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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
Abstract
The invention discloses a gas water heater and a control method thereof, wherein the gas water heater comprises a combustor with a combustion chamber and a condensed water drain pipe communicated with the combustion chamber; the control method of the gas water heater comprises the following steps: acquiring the liquid level of a condensate water drain pipe; and controlling the gas water heater to stop air intake when the liquid level of the condensed water drain pipe is determined not to be within a first liquid level preset range. The invention is beneficial to improving the use safety of the gas water heater.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a gas water heater and a control method thereof.
Background
In the related art, a gas water heater is operated, generally by controlling a gas flow rate to control a gas combustion heat required for supplying hot water. For the gas water heater with the blower, the rotating speed of the blower is controlled to provide corresponding air volume so as to maintain the gas water heater to perform combustion operation under good conditions. The design parameters of the control board program of the gas water heater are measured and set in advance when each parameter of the gas water heater is in a standard condition, however, once the gas water heater is abnormal, the potential safety hazard is easy to appear.
Disclosure of Invention
The invention mainly aims to provide a gas water heater and a control method thereof, aiming at improving the use safety of the gas water heater.
In order to achieve the above object, the present invention provides a control method of a gas water heater, which is characterized in that the gas water heater comprises a burner with a combustion chamber, and a condensed water drain pipe communicated with the combustion chamber; the control method of the gas water heater comprises the following steps:
acquiring the liquid level of a condensate water drain pipe;
and controlling the gas water heater to stop air intake when the liquid level of the condensed water drain pipe is determined not to be within a first liquid level preset range.
Optionally, the control method of the gas water heater further comprises the following steps:
acquiring ambient wind pressure and generating a wind pressure detection signal;
when the wind blockage is determined to occur according to the wind pressure detection signal, the current water level of the condensed water drain pipe is obtained;
and when the liquid level of the condensed water drain pipe is determined to be lower than the minimum value of the first liquid level preset range, increasing the rotating speed of the fan of the gas water heater until the liquid level of the condensed water drain pipe is within the first liquid level preset range.
Optionally, the control method of the gas water heater further comprises the following steps:
when the environment wind pressure is determined to be in a normal partial pressure interval according to the wind pressure detection signal, the rotating speed of the fan of the gas water heater is reduced, so that the liquid level of the condensed water drain pipe is maintained in the first liquid level preset range.
Optionally, the control method of the gas water heater further comprises the following steps:
when the liquid level fluctuation value of the liquid level of the condensed water drain pipe in a first preset time is determined to be larger than a preset liquid level fluctuation value according to the water level detection signal, acquiring the wind pressure detection signal;
and when the environment air pressure is determined to be normal, reducing the rotating speed of the fan until the liquid level of the condensed water drain pipe is maintained within the first liquid level preset range.
Optionally, the control method of the gas water heater further comprises the following steps:
and acquiring the current rotating speed of the fan of the gas water heater, and controlling the gas water heater to stop air intake when the fan works abnormally according to the air pressure detection signal and the current rotating speed of the fan.
Optionally, the gas water heater includes a wind pressure sensor and a liquid level sensor, and the control method of the gas water heater further includes the following steps:
and controlling the gas water heater to stop air intake when the wind pressure sensor and/or the liquid level sensor is determined to be abnormal according to the water level detection signal and the wind pressure detection signal.
The invention also proposes a gas water heater comprising:
a burner having a combustion chamber;
a condensed water drain pipe in communication with the combustion chamber;
the control device comprises a controller and a control program of the gas water heater, wherein the control program of the gas water heater is stored on a memory and can run on the controller, and the controller realizes the method when executing the control program of the gas water heater.
Optionally, the gas water heater further comprises:
and the liquid level sensor is arranged on the condensed water drainage pipe and is used for detecting the liquid level in the condensed water drainage pipe and generating a liquid level detection signal.
Optionally, the gas water heater further comprises:
the combustor and the condensed water drain pipe are arranged in the shell;
the fan is arranged in the shell, and an air outlet of the fan is communicated with the combustion chamber.
Optionally, the gas water heater further comprises a combustion control module and a fan driving module, and the controller and the combustion control module are respectively connected with the fan driving module; the combustion control module is used for detecting the water outlet temperature and the water flow of the gas water heater and controlling the fan driving module to adjust the rotating speed of the fan according to the water outlet temperature and the water flow of the gas water heater.
According to the control method of the gas water heater, the liquid level of the condensed water drain pipe is obtained, and when the liquid level of the condensed water drain pipe is determined not to be within the first liquid level preset range, the gas water heater is controlled to stop air intake. According to the invention, by increasing the liquid level of the condensed water drain pipe, the detection can be carried out when the water seal has no water or the water column is abnormal, so that the problems that the water seal fails due to sudden pressure increase of the water in the water seal, or the water column does not exist in the water seal due to water leakage in the water seal, and finally the water seal cannot play a sealing role, harmful gas in tail gas is discharged indoors and the safety of users is harmed are solved. The invention can control the gas water heater to stop working when the liquid level of the condensed water drain pipe is abnormal, and is beneficial to improving the use safety of the gas water heater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a control method for a gas water heater according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a control method for a gas water heater according to the present invention;
FIG. 3 is a schematic flow chart diagram illustrating a control method for a gas water heater according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a gas water heater according to an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides a control method of a gas water heater.
The gas water heater can be selected as a full-premix gas water heater, a mixing cavity is formed in the full-premix gas water heater, and the gas water heater comprises a combustor with a combustion chamber and a condensed water drain pipe communicated with the combustion chamber; the gas water heater also comprises a pre-heating exchanger, a heating disc, a fan, a burner, a gas pipeline and other components, when the gas water heater works, the fan and the gas proportional valve respectively convey air and gas into the mixing cavity, the air and the gas are fully and uniformly mixed in the mixing cavity and then enter the burner for combustion, because the pre-heating disc pre-heats a catalyst in the burner, the fuel can be subjected to flameless catalytic combustion once entering the burner, in the catalytic combustion process, the ignition temperature of the fuel can be reduced through the catalyst, the oxidation degree of the fuel can be deepened, organic matters can be subjected to flameless combustion under the condition of lower ignition temperature and are oxidized and decomposed into final combustion products of carbon dioxide and water, a large amount of heat is released, the high-temperature heat enters the water heater and exchanges heat with the water in the water pipe, and the aim of heating the water in the heat exchanger is fulfilled, and finally, discharging the hot water in the heat exchanger out of the gas water heater from a water outlet pipe for users to use. The combustion chamber of the fully premixed gas water heater is closed, and air needs to be sent into the combustion chamber in a blower blowing mode in the combustion process. The fully premixed gas water heater adopts an inverted combustion mode, water vapor and carbon dioxide generated by combustion are discharged to the outside through a flue below the fully premixed gas water heater, the combustion efficiency is high, however, condensed water can be generated due to the fact that the water vapor in tail gas (water + carbon dioxide + carbon monoxide + nitrogen oxide) is lower than 100 ℃, the condensed water needs to be guided and inverted, namely, a water seal is needed, the combustion chambers are connected together, the tail gas generated by combustion is prevented from being discharged to the inside through a pipeline of the water seal, a part of water can be stored in the water seal, and the fact that the tail gas cannot be discharged to the inside through the pressure generated by water is. However, once the gas water heater fails, for example, when the machine explodes, the pressure in the combustion chamber is increased instantly due to rapid expansion of the gas in the combustion chamber, the water seal is connected with the combustion chamber, the pressure of the water inlet of the water seal is the same as the pressure in the combustor, the water column in the water seal is pushed out by the pressure at the moment, the water seal is failed, carbon monoxide leaks into a user room after a long time, and the carbon monoxide poisoning condition is caused, which is very unsafe.
In order to solve the above problem, referring to fig. 1, in an embodiment of the present invention, the control method of the gas water heater includes the following steps:
s100, acquiring the liquid level of a condensate water drain pipe;
it can be understood that, comdenstion water drain pipe one end and combustion chamber intercommunication, the other end is the outlet end, in order to prevent that the flue gas from discharging along the comdenstion water drain pipe, between comdenstion water drain pipe and combustion chamber, perhaps form a water seal structure on the comdenstion water drain pipe, this water seal structure has one can impound in order to form the low hollow portion of water-stop, can be that the diameter is less than one section pipeline of comdenstion water drain pipe diameter, also can be that certain one section of comdenstion water drain pipe forms a circle column structure through the turn-ups, perhaps also can turn-ups and turns round and form a U type column structure, the comdenstion water drain pipe. In this embodiment, a liquid level detection device, such as a liquid level sensor or a liquid level switch, is disposed on the condensed water drain pipe, and the liquid level height in the water seal is detected by detecting the current liquid level condition of the liquid in the drain pipe. This embodiment specifically can adopt capacitanc level sensor to realize, and non-contact level measurement is through providing an induction field at predetermined liquid level point, and the capacitance value of induction field can change when this liquid level point has water, through the continuous charge-discharge to electric capacity, can judge whether there is water at this liquid level point position.
And S200, controlling the gas water heater to stop air intake when the liquid level of the condensed water drain pipe is determined not to be within a first liquid level preset range.
In this embodiment, set up a plurality of liquid level check points at the comdenstion water drain pipe, gas heater is at the in-process of work, and liquid level detection device can be through detecting whether there is water at the corresponding liquid position point in the water seal to this water level that the water seal corresponds is confirmed this moment. Wherein, a plurality of liquid level check points are including the minimum liquid position point and the highest liquid position point that detect the water seal, and the liquid level that minimum liquid position point and highest liquid position point correspond is first liquid level and predetermines scope minimum and maximum, when the liquid level that detects the comdenstion water drain pipe is less than the minimum in the first liquid level predetermines the scope, then does not have the water column in confirming the water seal structure to judge that the water seal is unusual, if gas heater continues to work this moment, then the phenomenon of gas leakage appears because the water seal can not be used in easy. When the liquid level of the condensed water drain pipe is detected to be higher than the maximum value in the first liquid level preset range, the water seal drainage is determined to be abnormal, the whole water seal structure and even the drain pipe are filled with water, and at the moment, if the gas water heater continues to work, the phenomenon of water leakage is easily caused due to untimely drainage. Therefore, when the liquid level of the condensed water drain pipe is detected not to be within the first liquid level preset range, namely to be lower than the minimum value in the first liquid level preset range, or to be higher than the maximum value in the first liquid level preset range, the gas inlet valve of the gas water heater is closed to control the gas water heater to stop gas inlet, so that the gas safety for users is protected, and the use safety of the gas water heater is improved.
According to the control method of the gas water heater, the liquid level of the condensed water drain pipe is obtained, and when the liquid level of the condensed water drain pipe is determined not to be within the first liquid level preset range, the gas water heater is controlled to stop air intake. According to the invention, by increasing the liquid level of the condensed water drain pipe, the detection can be carried out when the water seal has no water or the water column is abnormal, so that the problems that the water seal fails due to sudden pressure increase of the water in the water seal, or the water column does not exist in the water seal due to water leakage in the water seal, and finally the water seal cannot play a sealing role, harmful gas in tail gas is discharged indoors and the safety of users is harmed are solved. The invention can control the gas water heater to stop working when detecting the abnormal liquid level of the condensed water drain pipe, thereby ensuring the use safety of the gas water heater.
Referring to fig. 2, in an embodiment, the control method of the gas water heater further includes the steps of:
s300, acquiring ambient wind pressure and generating a wind pressure detection signal;
s400, when the wind blockage is determined to occur according to the wind pressure detection signal, acquiring the current water level of the condensed water drain pipe;
s500, when the liquid level of the condensed water drain pipe is determined to be lower than the minimum value of the first liquid level preset range, increasing the rotating speed of a fan of the gas water heater until the liquid level of the condensed water drain pipe is within the first liquid level preset range.
It should be noted that, because the external environment is different, the corresponding environment wind pressure in each region of the gas water heater is also different, so that a self-learning starting module can be arranged in the gas water heater to start the self-learning mode of the wind blockage judging parameter after receiving a starting instruction, wherein, in the self-learning mode, the control module records the wind blockage judging parameter of the fan, so that the wind pressure in different regions can be adjusted in time. In practical application, a wind pressure sensor can be arranged on a shell of the gas water heater to detect the ambient wind pressure, or the ambient wind pressure can be indirectly acquired, a wind pressure detection signal is generated according to the acquired ambient wind pressure, and then the wind pressure detection signal is compared with a preset wind blockage judgment parameter. When severe weather such as typhoon, strong wind or hurricane occurs in the external environment, and the wind pressure of the current environment is larger than the wind blockage judgment parameter, the water seal liquid level of the condensate water drain pipe is obtained at the moment, and the water seal liquid level can drop. When the liquid level is lower than the minimum value of the first liquid level preset range, the pressure of the combustion chamber is low. At this time, the wind speed of the fan needs to be increased to resist the external wind pressure. After the wind speed of the fan is increased, the liquid level of the water seal structure 21 can be slowly increased, when the water seal liquid level is recovered and maintained in a first liquid level preset range when the wind speed of the fan is increased, the pressure of the combustion chamber is normal, and the gas in the gas water heater can be normally combusted.
In the above embodiment, the control method of the gas water heater further includes the following steps:
when the environment wind pressure is determined to be in a normal partial pressure interval according to the wind pressure detection signal, the rotating speed of the fan of the gas water heater is reduced, so that the liquid level of the condensed water drain pipe is maintained in the first liquid level preset range.
In this embodiment, the wind blockage may last for a short time, for example, one day or several hours, because the wind speed of the fan at this time is increased to counter the external wind pressure, the fan works in a non-scaled manner, after the external wind pressure is normal, the wind pressure can be detected by the wind pressure sensor to recover to a normal range, or when the fluctuation is small, the rotating speed of the fan can be reduced, so that the fan recovers to the rotating speed in the normal working mode, and the air volume provided by the fan to the combustion chamber can ensure that the pressure of the combustion chamber of the machine burns according to a predetermined value.
Referring to fig. 3, in an embodiment, the control method of the gas water heater further includes the steps of:
s600, when the liquid level fluctuation value of the liquid level of the condensed water drain pipe in a first preset time is determined to be larger than a preset liquid level fluctuation value according to the water level detection signal, acquiring the wind pressure detection signal;
s700, when the environment air pressure is determined to be normal, reducing the rotating speed of the fan until the liquid level of the condensed water drain pipe is maintained within the first liquid level preset range.
It should be noted that, during the use of the gas water heater, the problem of poor smoke discharge may occur. For example, users near seasides or at high residential levels are often affected by inclement weather (e.g., high winds) that can cause gas water heaters to smoke poorly. When the water heater is in a shutdown state due to a flue blockage fault, and a user starts the water heater by boiling water again, the gas valve of the gas water heater can be directly opened and ignited, so that deflagration is easy to occur, or deflagration is easy to occur due to the fact that a gap between the fire grate and the fire grate is too large or the gas heater is influenced by disturbance of forced exhaust airflow and other reasons, and potential safety hazards exist to the user.
Because the comdenstion water drain pipe, water seal structure 21 and combustor are connected, the pressure of comdenstion water drain pipe is the same with the inside pressure of combustor, when gas heater appearance deflagration, because deflagration's transient action, lead to the atmospheric pressure of gas chamber in the twinkling of an eye easily, also resume again after the liquid level increase of water seal to normal or fall lower value, also when gas heater appearance deflagration, combustion chamber pressure changes, then can lead to water column in the water seal to suddenly high and suddenly low continuous reciprocating this moment. Therefore, when the liquid level fluctuation value detected in the first preset time is greater than the preset liquid level fluctuation value, whether the detonation phenomenon or the wind blockage phenomenon occurs at the moment can be judged according to the wind pressure detection signal corresponding to the current environmental wind pressure. Specifically, when the explosion occurs, the fluctuation size of the liquid level in the water seal in unit time and/or the fluctuation frequency are large. When the air blockage occurs, the liquid level in the water seal is continuously reduced due to the reduction of the pressure of the combustion chamber, the height change cannot occur, and the efficiency of the liquid level reduction during the air blockage is smaller than the slope of the liquid level reduction during the deflagration. In addition, under normal conditions, the external environment wind pressure can be maintained in a normal range, so when the combustion water heater knocks, whether the wind blockage occurs or not can be confirmed according to the acquired wind pressure detection signal, and the gas water heater knocks at the moment is further confirmed. At the moment, the wind speed of the fan can be controlled and adjusted, the load is reduced, the pressure generated by combustion is reduced, the pressure of the combustion chamber is normal, and normal combustion is ensured.
In one embodiment, the control method of the gas water heater further comprises the following steps:
and acquiring the current rotating speed of the fan of the gas water heater, and controlling the gas water heater to stop air intake when the fan works abnormally according to the air pressure detection signal and the current rotating speed of the fan.
In this embodiment, fan rotational speed corresponds with external environment wind pressure and burning demand, when carrying out the proportion of ratio air and gas according to the burning demand, then can adjust fan rotational speed according to current environment wind pressure to satisfy the application demand. The current rotating speed according to detecting wind pressure detection signal and fan confirms that can not correspond between the two, for example, it is 50pa to correspond the environmental wind pressure for 500rad/s at the fan rotational speed, the fan rotational speed is 2000rad/s and corresponds in the corresponding relation that the environmental wind pressure is 20pa, if detect this moment the fan rotational speed for 4500rad/s and correspond when the environmental wind pressure is 20pa, then can confirm that the fan breaks down unusually this moment, consequently also can close gas heater admission valve this moment and thereby control gas heater and stop admitting air, protection user's gas safety, be favorable to improving the security that gas heater used.
In one embodiment, the gas water heater comprises a wind pressure sensor and a liquid level sensor, and the control method of the gas water heater further comprises the following steps:
and controlling the gas water heater to stop air intake when the wind pressure sensor and/or the liquid level sensor is determined to be abnormal according to the water level detection signal and the wind pressure detection signal.
In order to ensure that the wind pressure sensor and the liquid level sensor work normally, in the embodiment, the gas water heater performs self-checking when being powered on, and when the wind pressure sensor and the liquid level sensor are performed, the feedback signals of the wind pressure sensor and the liquid level sensor can be acquired, or the signals fed back and the numerical value stored in the gas water heater are analyzed, so as to confirm whether the wind pressure sensor and the liquid level sensor work normally. When detecting that the wind pressure sensor and the water seal liquid level sensor are normal, the gas water heater starts to work after hot water is needed, otherwise, the gas water heater closes the gas inlet valve so as to control the gas water heater to stop gas inlet, thereby protecting the gas safety of users and being beneficial to improving the use safety of the gas water heater.
The invention also provides a gas water heater.
Referring to fig. 4, the gas water heater includes:
a burner 10, said burner 10 having a combustion chamber 12;
a condensate drain pipe 20, the condensate drain pipe 20 communicating with the combustion chamber 12;
a controller 30, and
a controller 30 and a control program of the gas water heater stored on a memory (not shown) and operable on the controller 30, wherein the controller 30 implements the method when executing the control program of the gas water heater.
In this embodiment, the gas water heater is provided with a housing 40, the housing 40 has an air inlet 41 for fuel and an exhaust port 42 for exhaust gas, the burner 10 further has a burner body 11, a premixing cavity housing (not shown) and a preheating plate (not shown), the premixing cavity housing is disposed in the housing 40 of the gas water heater, the premixing cavity housing has a gas inlet, an air inlet and a mixed gas outlet communicated with the mixing cavity, the premixing cavity housing defines the mixing cavity therein, the burner body 11 is disposed below the premixing cavity, the burner body 11 is communicated with the mixing cavity, a catalyst for catalyzing the smokeless catalytic combustion of the burner body 11 is disposed in the burner body 11, a heat exchanger is disposed below the burner 10 and accommodated in the combustion chamber 12, the combustion chamber 12 is connected with the burner body 11 to absorb heat generated by the combustion of the burner body 11, the heat exchanger has a water inlet and a water outlet, the water inlet is switched on with cold water inlet, and the delivery port switches on with the hot water export, and preheating plate links to each other with combustor 10 in advance in order to preheat combustor 10, and preheating plate's heating temperature is adjustable in advance. When the burner 10 works, the fan 70 and the gas proportional valve respectively convey air and gas into the mixing cavity, the air and the gas are fully and uniformly mixed in the mixing cavity and then enter the burner 10 positioned below the mixing cavity for combustion, and water in the heat exchanger can absorb heat generated by the burner 10, so that hot water is formed for a user to use. For example, a large amount of heat generated by the burner 10 may be exchanged with the surface of the heat exchanger to heat the water in the heat exchanger. Or, a plurality of water pipes for water circulation can be arranged in the heat exchanger, a water inlet pipe and a water outlet pipe which are communicated with the water pipes are arranged outside the heat exchanger, cold water can be injected into the water pipes of the heat exchanger through the system through the water inlet pipe (not shown), fuel is combusted in the combustor 10 to generate high-temperature flue gas, the high-temperature flue gas enters the water heater and exchanges heat with the water in the water pipes, the purpose of heating the water in the heat exchanger is achieved, and finally the hot water in the heat exchanger is discharged out of the gas water heater from the water outlet pipe (not shown) to be used by a user.
The controller 30 may be a CPU, an MCU, a single chip, a DSP, an FPGA, or other controller 30, the control center of the gas water heater of the controller 30 is connected to each part of the whole gas water heater by using various interfaces and lines, and executes various functions and processing data of the gas water heater by running or executing software programs and/or modules stored in the memory and calling data stored in the memory, thereby integrally monitoring the gas water heater. Controller 30 may include one or more processing units; preferably, the controller 30 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor.
In an embodiment, a liquid level sensor 50 is disposed on the condensed water drain pipe 20, and the liquid level sensor 50 is configured to detect a liquid level in the condensed water drain pipe 20 and generate a liquid level detection signal; the number of the liquid level sensors 50 is plural, and the plural liquid level sensors 50 are sequentially arranged on the condensed water drain pipe 20;
the condensed water diversion inversion 60 comprises a diversion structure 61 arranged at the lower end of the gas chamber and a condensed water collection part 62 corresponding to the diversion structure 61; wherein the condensed water collecting portion 62 communicates the condensed water outlet with the gas chamber through the condensed water discharging pipe 20. When the water vapor in the combustion chamber 12 meets the side wall of the combustion chamber 12 with the temperature lower than the medium 100 ℃, condensed water can be generated, the condensed water flows into the condensed water collecting part 62 through the flow guide structure 61, the liquid level of the condensed water can gradually rise along with the continuous injection of the condensed water, and the condensed water flows out through the water seal structure 21 and the condensed water drain pipe 20. The plurality of liquid level sensors 50 are disposed on the condensed water drain pipe 20, and detect whether water is present at each liquid level detection point by a non-contact detection method, so as to perform corresponding control according to the detection result.
Referring to fig. 4, in an embodiment, the gas water heater further includes:
a housing 40, on which the burner 10 and the condensed water drain pipe 20 are disposed;
and the fan 70 is arranged in the shell 40, and an air outlet of the fan 70 is communicated with the combustion chamber 12.
In this embodiment, the gas water heater further includes a fan 70 and a gas proportional valve, the fan 70 and the gas proportional valve are respectively connected to the controller 30, the fan 70 is disposed above the mixing chamber and is used for delivering air to the mixing chamber to provide power for the flow of air, and the gas proportional valve is connected to the burner 10 to deliver gas to the mixing chamber to ensure the fuel supply of the gas water heater, thereby ensuring the normal operation of the gas water heater.
Referring to fig. 4, in an embodiment, the gas water heater further includes a combustion control module 80 and a fan driving module 90, and the controller 30 and the combustion control module 80 are respectively connected to the fan driving module 90; the combustion control module 80 is configured to detect the water outlet temperature and the water flow rate of the gas water heater, and control the fan driving module 90 to adjust the rotation speed of the fan 70 according to the water outlet temperature and the water flow rate of the gas water heater.
In this embodiment, the gas water heater further includes a temperature sensor for measuring water temperature and a water flow rate, and the combustion control module 80 controls the fan driving module 90 to adjust the rotation speed of the fan 70 according to the water outlet temperature and the water flow rate, so that tail gas such as carbon monoxide, hydrocarbons, tar and the like generated by combustion meets the national standard.
In practical application, the fan driving module 90 may be implemented by using a dedicated integrated chip, or the fan 70 may be driven by a driving circuit composed of power transistors such as MOS transistors and IGBTs. The controller 30 in the gas water heater controls the fan 70 by controlling the fan drive module 90.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The control method of the gas water heater is characterized in that the gas water heater comprises a combustor with a combustion chamber and a condensed water drain pipe communicated with the combustion chamber; the control method of the gas water heater comprises the following steps:
acquiring the liquid level of a condensate water drain pipe;
and controlling the gas water heater to stop air intake when the liquid level of the condensed water drain pipe is determined not to be within a first liquid level preset range.
2. The control method of a gas water heater as claimed in claim 1, further comprising the steps of:
acquiring ambient wind pressure and generating a wind pressure detection signal;
when the wind blockage is determined to occur according to the wind pressure detection signal, the current water level of the condensed water drain pipe is obtained;
and when the liquid level of the condensed water drain pipe is determined to be lower than the minimum value of the first liquid level preset range, increasing the rotating speed of the fan of the gas water heater until the liquid level of the condensed water drain pipe is within the first liquid level preset range.
3. The control method of a gas water heater as claimed in claim 2, further comprising the steps of:
when the environment wind pressure is determined to be in a normal partial pressure interval according to the wind pressure detection signal, the rotating speed of the fan of the gas water heater is reduced, so that the liquid level of the condensed water drain pipe is maintained in the first liquid level preset range.
4. The control method of a gas water heater as claimed in claim 3, further comprising the steps of:
when the liquid level fluctuation value of the liquid level of the condensed water drain pipe in a first preset time is determined to be larger than a preset liquid level fluctuation value according to the water level detection signal, acquiring the wind pressure detection signal;
and when the environment air pressure is determined to be normal, reducing the rotating speed of the fan until the liquid level of the condensed water drain pipe is maintained within the first liquid level preset range.
5. The control method of a gas water heater as claimed in claim 3, further comprising the steps of:
and acquiring the current rotating speed of the fan of the gas water heater, and controlling the gas water heater to stop air intake when the fan works abnormally according to the air pressure detection signal and the current rotating speed of the fan.
6. The control method of a gas water heater as claimed in claim 3, wherein the gas water heater comprises a wind pressure sensor and a liquid level sensor, the control method of the gas water heater further comprising the steps of:
and controlling the gas water heater to stop air intake when the wind pressure sensor and/or the liquid level sensor is determined to be abnormal according to the water level detection signal and the wind pressure detection signal.
7. A gas water heater, comprising:
a burner having a combustion chamber;
a condensed water drain pipe in communication with the combustion chamber;
a controller and a control program for a gas water heater stored on a memory and operable on the controller, the controller implementing the method of any one of claims 1-6 when executing the control program for the gas water heater.
8. The gas water heater of claim 7, further comprising:
and the liquid level sensor is arranged on the condensed water drainage pipe and is used for detecting the liquid level in the condensed water drainage pipe and generating a liquid level detection signal.
9. The gas water heater of claim 7, further comprising:
the combustor and the condensed water drain pipe are arranged in the shell;
the fan is arranged in the shell, and an air outlet of the fan is communicated with the combustion chamber.
10. The gas water heater of claim 9, further comprising a combustion control module and a fan drive module, said controller and combustion control module being connected to said fan drive module respectively; the combustion control module is used for detecting the water outlet temperature and the water flow of the gas water heater and controlling the fan driving module to adjust the rotating speed of the fan according to the water outlet temperature and the water flow of the gas water heater.
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