CN111854175B - Gas water heater and control method of circulating water pump thereof - Google Patents
Gas water heater and control method of circulating water pump thereof Download PDFInfo
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- CN111854175B CN111854175B CN202010711955.3A CN202010711955A CN111854175B CN 111854175 B CN111854175 B CN 111854175B CN 202010711955 A CN202010711955 A CN 202010711955A CN 111854175 B CN111854175 B CN 111854175B
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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 and a control method of a circulating water pump thereof, wherein the control method comprises the following steps: calculating the required lift of the circulating water pump according to the obtained length of the circulating pipeline; obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump; calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater; judging whether the longest time is less than the preset shortest time for circulating heating of the circulating pipeline; if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow; when the gas water heater is preheated, the circulating water pump is controlled to work according to the determined working flow rate. The invention can effectively solve the problem that the normal preheating of the water heater is influenced by the speed regulation method of the water pump of the existing water heater.
Description
Technical Field
The invention relates to the technical field of water heaters, and particularly relates to a gas water heater and a control method of a circulating water pump thereof.
Background
At present, zero cold water gas water heaters are becoming the trend of the water heater industry because they can realize that hot water can be used immediately after being started, and are more and more favored by consumers. When the zero-cold water gas water heater starts the preheating function, a circulating pump arranged in the zero-cold water gas water heater operates to drive the stored water of the hot water pipe and the water return pipe to circularly flow and realize preheating. The existing room in the market is transformed and installed with a zero-cold water gas water heater, and because the resistance of a circulating pipeline is too large, a plurality of faults that the room cannot be started for heating after a preheating pump is started appear, and the room cannot be normally preheated. In order to overcome the problem, most of zero-cold-water gas water heaters generally adopt the maximum working condition of a water pump, namely the maximum rotating speed, when in a preheating working mode, and ensure that the circulating flow can reach the starting flow of the whole machine.
However, when the circulating pump operates under the maximum working condition, the maximum rotating speed can reach more than 6000r/min, high-frequency oscillation noise is generated, and user experience is influenced. Part zero cold water gas heater in market has a plurality of fixed circulating pump rotational speed gears, through progressively adjusting down circulating pump rotational speed gear, reduces the rotational speed, can show the noise reduction. However, when the resistance of the pipeline is large, the rotating speed gear of the circulating pump is directly switched to a lower rotating speed gear, so that sufficient circulating flow is possibly not generated, the water in the whole circulating pipe stops flowing, and the circulating heating is stopped at the moment, so that the normal preheating cannot be realized.
Disclosure of Invention
The embodiment of the invention provides a gas water heater and a control method of a circulating water pump thereof, which can effectively solve the problem that the normal preheating of the water heater is influenced by the speed regulation method of the water pump of the existing water heater.
An embodiment of the present invention provides a gas water heater, including:
one end of the circulating pipeline is communicated with a water inlet of the gas water heater, and the other end of the circulating pipeline is communicated with a water outlet of the gas water heater;
the circulating water pump is arranged in the circulating pipeline; and a process for the preparation of a coating,
a controller connected to the circulating water pump and configured to:
calculating the required lift of the circulating water pump according to the obtained length of the circulating pipeline;
obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump;
calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater;
judging whether the longest time is less than the preset shortest time for circulating heating of the circulating pipeline;
if the maximum time is longer than the minimum time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump;
if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow;
and when the gas water heater is preheated, controlling the circulating water pump to work according to the determined working flow rate.
As an improvement of the above solution, the controller is specifically configured to:
if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
if the maximum time is larger than the time threshold, calculating the working flow rate of the circulating water pump according to the difference value between the maximum water pump flow and the minimum starting flow;
if the maximum time is less than the time threshold, taking a preset working flow rate as the working flow rate of the circulating water pump; the preset working flow speed is less than the maximum water pump flow.
As an improvement of the above, if the maximum time is greater than the time threshold, the controller calculates the operating flow rate v by the following formulaPump and method of operating the same：
vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerIs the minimum startup flow.
As an improvement of the above scheme, the controller calculates the required lift of the circulating water pump by:
and dividing the obtained length of the circulating pipeline by a value of 10 to obtain the required lift of the circulating water pump.
As an improvement of the above scheme, when the preheating function of the gas water heater is started for the first time, the preset preheating water pump rotating speed v is adoptedPreparation ofControlling the circulating water pump to work and recording the time T when the preheating is startedStarting point；
When the temperature of the water in the circulating pipeline is heated to a preset target temperature, stopping preheating, and recording the time T at the momentFinal (a Chinese character of 'gan')；
Calculating the first preheat cycle duration TGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
According to the duration T of the first preheating cycleGeneral assemblyCalculating to obtain the volume V of water in the circulating pipelineGeneral assembly＝vPump and method of operating the same*TGeneral assembly；
According to the volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Wherein R is the pipe inside radius of the circulation pipe.
Another embodiment of the present invention correspondingly provides a method for controlling a circulating water pump of a gas water heater, including:
calculating the required lift of the circulating water pump according to the obtained length of the circulating pipeline;
obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump;
calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater;
judging whether the longest time is less than the preset shortest time for circulating heating of the circulating pipeline;
if the maximum time is longer than the minimum time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump;
if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow;
and when the gas water heater is preheated, controlling the circulating water pump to work according to the determined working flow rate.
As an improvement of the above-mentioned scheme, if the longest time is shorter than the shortest time, the setting of the working flow rate of the circulating water pump to be smaller than the maximum water pump flow rate includes:
if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
if the maximum time is larger than the time threshold, calculating the working flow rate of the circulating water pump according to the difference value between the maximum water pump flow and the minimum starting flow;
if the maximum time is less than the time threshold, taking a preset working flow rate as the working flow rate of the circulating water pump; the preset working flow speed is less than the maximum water pump flow.
As an improvement of the above solution, if said maximum time is greater than said time threshold, said working flow rate v is calculated by the following formulaPump and method of operating the same：
vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerIs the minimum startup flow.
As an improvement of the above solution, the calculating a required lift of the circulating water pump according to the obtained length of the circulating pipeline includes:
and dividing the obtained length of the circulating pipeline by a value of 10 to obtain the required lift of the circulating water pump.
As an improvement of the above solution, before the calculating the required head of the circulating water pump according to the obtained length of the circulating pipeline, the method further includes:
when the preheating function of the gas water heater is started for the first time, the rotating speed v of a preset preheating water pump is usedPreparation ofControlling the circulating water pump to work and recording the time T when the preheating is startedStarting point；
When the temperature of the water in the circulating pipeline is heated to a preset target temperature, stopping preheating, and recording the time T at the momentFinal (a Chinese character of 'gan')；
Calculating the first preheat cycle duration TGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
According to the duration T of the first preheating cycleGeneral assemblyCalculating to obtain the volume V of water in the circulating pipelineGeneral assembly＝vPreparation of*TGeneral assembly；
According to the volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Wherein R is the pipe inside radius of the circulation pipe.
Compared with the prior art, the gas water heater and the control method of the circulating water pump thereof disclosed by the embodiment of the invention have the advantages that the total length of the circulating pipeline in a user house is firstly confirmed, then the theoretical rotating speed and the longest heating time of the circulating water pump which can reach the length are found out, and finally the proper rotating speed of the water pump is determined by reversely comparing the shortest heating time and the longest heating time, so that the reasonable circulating water flow and the reasonable heating speed are ensured, the running noise of the water pump is reduced, the running of the circulating water pump at the highest rotating speed is also avoided, and the service life of the circulating water pump is prolonged. In addition, when the noise is reduced, because the circulating flow rate of the water pump is reduced, the combustion load of the water heater can be reduced synchronously, and the purpose of saving the gas for users is also achieved.
Drawings
FIG. 1 is a schematic structural diagram of a zero-cold-water heater according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a control method of a circulating water pump of a gas water heater according to an embodiment of the present invention;
fig. 3 is a graph showing a preset relationship between the head of the circulating water pump and the maximum pump flow of the circulating water pump according to an embodiment of the present invention.
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.
An embodiment of the present invention provides a gas water heater, including: a circulating pipeline 10, a circulating water pump 11 and a controller;
one end of the circulating pipeline 10 is used for being communicated with a water inlet of the gas water heater, and the other end of the circulating pipeline is used for being communicated with a water outlet of the gas water heater;
the circulating water pump 11 is arranged in the circulating pipeline;
the controller is connected with the circulating water pump and is used for:
calculating the required lift of the circulating water pump 11 according to the obtained length of the circulating pipeline 10;
obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump 11 and the maximum water pump flow of the circulating water pump;
calculating the maximum time of the circulating heating of the circulating pipeline 10 according to the obtained water quantity in the circulating pipeline 10 and the minimum starting flow of the gas water heater;
judging whether the longest time is less than the preset shortest time for the circulating heating of the circulating pipeline 10;
if the maximum time is longer than the minimum time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump 11;
if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump 11 to be less than the maximum water pump flow;
and when the gas water heater is preheated, controlling the circulating water pump 11 to work according to the determined working flow rate.
In the embodiment of the invention, the gas water heater starts to perform circulating heating after being started, the circulating water pump 11 operates to suck water in the circulating pipeline 10 into the gas water heater through the water inlet joint, and water flow flows out from the water inlet through the heat exchanger and the water outlet. When the gas water heater senses water flow, gas enters the combustor through the gas inlet through the gas proportional valve to be ignited, and the fan rotates to provide necessary oxygen for combustion. The gas generated by burning the gas in the burner passes through the heat exchanger, and the heat is absorbed by the water flowing through the heat exchanger, so that the cold water is changed into hot water and flows out of the gas water heater, and the gas is discharged out of the water heater. In the cyclic heating process, the working flow rate of the circulating water pump 11 of the gas water heater is always controlled by the controller, and the setting of the working flow rate can be adjusted in the cyclic heating process of the first operation of the gas water heater.
In the specific adjustment and calibration process of the working flow rate, the required lift of the circulating water pump 11 needs to be calculated according to the length of the circulating pipeline 10, and then the maximum water pump flow of the circulating water pump under the lift is obtained according to the preset relation between the lift of the circulating water pump 11 and the maximum water pump flow of the circulating water pump. In one example, the length 10 of the circulation line may be a value to be input, and the length of the circulation line 10 is input into the gas water heater so as to allow the gas water heater to obtain the working environment information. In another example, the length 10 of the circulation line may be calculated by a controller of the gas water heater during the first preheating process of the gas water heater, and the specific calculation manner can be referred to the related contents below.
After the length of the circulating pipeline is obtained, the maximum water pump flow of the circulating water pump under the lift is obtained according to the preset relationship between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump as shown in fig. 3. The maximum pump flow represents the maximum speed that the pump can achieve for a certain pipe length. If the user uses this rotational speed, noise is generated. In fact, for the centrifugal water pump, when the model of the water pump is determined, the consumed power is in direct proportion to the actual flow of the water pump. The flow of the water pump is reduced along with the increase of the lift, and the power of the motor is reduced due to the fact that the lift of the water pump is too high, so that the higher the lift is, the smaller the flow is, and the smaller the power consumption is. Conversely, the lower the head, the greater the flow, and the greater the power consumed.
Then, according to the obtained water quantity in the circulation pipeline 10 and the minimum starting flow of the gas water heater, the maximum time of the circulation heating of the circulation pipeline 10 is calculated. The calculated maximum time of the cyclic heating is used for determining the interval of the working flow rate by combining the minimum time of the cyclic heating, and the flow rate interval of the working flow rate is 2: one is the interval in which the longest time is longer than the shortest time, and the other isThe longest time is less than the interval under the condition of the shortest time; the calculated maximum water pump flow is a specific critical value of the interval for confirming the working flow rate. For example, the total amount of water V in the circulation lineGeneral assemblyHas been calculated. The minimum starting flow of the water heater is 2.5L/min, and the minimum time of the cyclic heating is 20min, so that the maximum heating time t is VGeneral assembly/2.5。
As an example, if t>20, the working flow rate vPump and method of operating the sameSetting the water outlet quantity to be the same as the maximum water outlet quantity of the gas water heater; in this example, the maximum water yield of the gas water heater is set to 16L/min, so vPump and method of operating the same＝16L/min；
If t is<20, the working flow rate vPump and method of operating the sameIs set to a value less than the maximum pump flow. Can order vPump and method of operating the same＝5L/min。
In addition, it is understood that the controller may be a main control board having a control function for the gas water heater device, or may be a plurality of control units distributed on different circuit boards, and the like, and is not limited specifically herein.
Compared with the prior art, the gas water heater and the control method of the circulating water pump 11 thereof disclosed by the embodiment of the invention firstly confirm the total length of the circulating pipeline 10 in a user's home, then find out the theoretical rotating speed and the longest heating time of the circulating water pump 11 which can be reached under the length, and finally determine the proper rotating speed of the water pump by reversely comparing the shortest heating time and the longest heating time, so that the reasonable circulating water flow and the reasonable heating speed are ensured, the noise of the operation of the water pump is reduced, and the operation of the circulating water pump 11 under the highest rotating speed is also avoided, thereby prolonging the service life of the circulating water pump 11. In addition, when the noise is reduced, because the circulating flow rate of the water pump is reduced, the combustion load of the water heater can be reduced synchronously, and the purpose of saving the gas for users is also achieved.
Illustratively, the controller is specifically configured to:
if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
if the maximum time is greater than the time threshold, calculating the working flow rate of the circulating water pump 11 according to the difference value between the maximum water pump flow and the minimum starting flow;
if the maximum time is less than the time threshold, taking a preset working flow rate as the working flow rate of the circulating water pump 11; the preset working flow speed is less than the maximum water pump flow.
In an embodiment of the invention, the known longest time t is smaller than the said shortest time, i.e. t<20, the working flow rate vPump and method of operating the sameIs set to a value less than the maximum pump flow. The value can be obtained by additionally introducing a time threshold value T0And comparing the time with the shortest time and then accurately calculating.
For example setting T0The minimum starting flow of the water heater is 2.5L/min, the minimum time of the cyclic heating is 20min, and the preset working flow rate is 5L/min. Maximum heating time t ═ VGeneral assembly2.5, and t<20。
If T is0<t, can order vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerFor the minimum start-up flow, in this embodiment, the minimum start-up flow of the water heater is 2.5L/min, so vPump and method of operating the same＝(v1-2.5)/2。
If t is<T0Can order vPump and method of operating the sameAt 5L/min, where 5L/min is the preset operating flow rate at which the gas water heater first preheater start-up would be performed by default.
Illustratively, the controller calculates the required head of the circulating water pump 11 by:
dividing the obtained length of the circulation pipeline 10 by a value 10 to obtain the required lift of the circulation water pump 11.
Illustratively, the controller is further configured to:
when the preheating function of the gas water heater is started for the first time, the rotating speed v of a preset preheating water pump is usedPreparation ofThe operation of the circulating water pump 11 is controlled,and records the time T when preheating is startedStarting point；
When the temperature of the water in the circulation pipeline 10 is heated to a preset target temperature, the preheating is stopped, and the time T at the moment is recordedFinal (a Chinese character of 'gan')；
Calculating the first preheat cycle duration TGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
According to the duration T of the first preheating cycleGeneral assemblyThe volume V of water in the circulation line 10 is calculatedGeneral assembly＝vPreparation of*TGeneral assembly；
According to the volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Where R is the pipe inside radius of the circulation pipe 10.
After a user installs the gas burner, the preheating circulation is operated for the first time, the circulating water pump 11 is operated at the rotating speed of 5L/min, and the preset rotating speed of the preheating water pump is VPreparation ofIndicating the time T at which the system records the start of a cycleStarting pointThe inlet temperature sensor records the inlet temperature at the beginning of the cycle T1 and the end of the cycle T2 is set to above 44 ℃ (up to a temperature of 44 ℃ depending on the system logic cycle). The system starts to circulate, and the water inlet temperature sensor can record the temperature of the water heated by the gas water heater at any time. When the return water temperature reaches 44 ℃, the circulation stops, and the system records the time T at the momentFinal (a Chinese character of 'gan')At this time, the volume V of water in the whole circulation lineGeneral assembly＝(TFinal (a Chinese character of 'gan')-TStarting point)*VPreparation of. The inner radius of the circulation line 10 is denoted by R, and the total length L of the circulation line 10 is equal to VGeneral assembly/(3.14*R2). For example, R1.8 cm 18mm, TStarting pointIs 3 hours and 0 minutes, TFinal (a Chinese character of 'gan')3 hours and 25 minutes, then VGeneral assembly＝(25)*VPreparation of＝75L＝75000cm3. The total length L of the circulation line 10 is then VGeneral assembly/(3.14*R2)＝7372.02cm。
Compared with the prior art, the gas water heater disclosed by the embodiment of the invention has the advantages that the total length of a circulation pipeline in a user house is firstly confirmed during installation, then the theoretical rotating speed and the longest heating time of the circulation water pump which can reach the length are found out, and finally the proper rotating speed of the water pump is determined by reversely comparing the shortest heating time and the longest heating time. From the above analysis, the embodiment of the invention can effectively match the adaptive water pump rotating speed for the circulating pipeline of the user home without reducing the water pump rotating speed for many times, and avoids the problem that the normal preheating cannot be realized because the sufficient circulating flow cannot be generated due to the direct reduction of the water pump rotating speed. The running noise of the water pump is reduced while the reasonable circulating water flow and the heating speed are ensured. Because the water pump does not operate at the highest rotating speed, the service life of the water pump is prolonged. Finally, the problems caused by after-sale and manual adjustment by a user are also saved.
Referring to fig. 2, it is a schematic flow chart of a control method of a circulating water pump of a gas water heater according to an embodiment of the present invention, including:
s20, calculating the lift required by the circulating water pump according to the obtained length of the circulating pipeline;
s21, obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump;
s22, calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater;
s23, judging whether the longest time is less than the preset shortest time for the circulating heating of the circulating pipeline;
s24, if the longest time is longer than the shortest time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump;
s25, if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow;
and S26, when the gas water heater is preheated, controlling the circulating water pump to work according to the determined working flow rate.
The length of the circulating pipeline is a numerical value to be input, and the length of the circulating pipeline is input into the gas water heater so that the gas water heater can obtain working environment information.
And after the length of the circulating pipeline is obtained, obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump. The maximum pump flow represents the maximum speed that the pump can achieve for a certain pipe length. If the user uses this rotational speed, noise is generated. In fact, for the centrifugal water pump, when the model of the water pump is determined, the consumed power is in direct proportion to the actual flow of the water pump. The flow of the water pump can be increased along with the increase of the lift, and the power of the motor can be reduced due to the fact that the lift of the water pump is too high, so that the higher the lift is, the smaller the flow is, and the smaller the consumed power is. Conversely, the lower the head, the greater the flow, and the greater the power consumed.
And calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater. And finally, determining the proper working flow rate by comparing the maximum time and the minimum time of the cyclic heating.
Compared with the prior art, the control method of the circulating water pump of the gas water heater disclosed by the embodiment of the invention has the advantages that the total length of the circulating pipeline in a user's home is firstly confirmed, then the theoretical rotating speed and the longest heating time of the circulating water pump which can reach the length are found out, and finally the proper rotating speed of the water pump is determined by reversely comparing the shortest heating time and the longest heating time. From the above analysis, the embodiment of the invention can effectively match the adaptive water pump rotating speed for the circulating pipeline of the user home without reducing the water pump rotating speed for many times, and avoids the problem that the normal preheating cannot be realized because the sufficient circulating flow cannot be generated due to the direct reduction of the water pump rotating speed. When the noise is reduced, because the circulating flow rate of the water pump is reduced, the combustion load of the water heater can be reduced synchronously, and the purpose of saving the gas for users is also achieved.
As an improvement of the above scheme, before the step S20, the method specifically includes:
a10, when the preheating function of the gas water heater is started for the first time, the rotating speed v of the preheating water pump is presetPreparation ofControl ofThe circulating water pump works and records the moment T when the preheating is startedStarting point；
A11, when the temperature of the water in the circulating pipeline is heated to a preset target temperature, stopping preheating, and recording the time T at the momentFinal (a Chinese character of 'gan')；
A12, calculating the duration T of the first preheating circulationGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
A13, according to the duration T of the first preheating cycleGeneral assemblyCalculating to obtain the volume V of water in the circulating pipelineGeneral assembly＝vPreparation of*TGeneral assembly；
A14, according to said volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Wherein R is the pipe inside radius of the circulation pipe.
After a user installs the gas burner, the preheating circulation is operated for the first time, the circulating water pump operates at the rotating speed of 5L/min, and the preset rotating speed of the preheating water pump is VPreparation ofIndicating the time T at which the system records the start of a cycleStarting pointThe inlet temperature sensor records the inlet temperature at the beginning of the cycle T1 and the end of the cycle T2 is set to above 44 ℃ (up to a temperature of 44 ℃ depending on the system logic cycle). The system starts to circulate, and the water inlet temperature sensor can record the temperature of the water heated by the gas water heater at any time. When the return water temperature reaches 44 ℃, the circulation stops, and the system records the time T at the momentFinal (a Chinese character of 'gan')At this time, the volume V of water in the whole circulation lineGeneral assembly＝(TFinal (a Chinese character of 'gan')-TStarting point)*VPreparation of. The inner radius of the circulation line 10 is denoted by R, and the total length L of the circulation line 10 is equal to VGeneral assembly/(3.14*R2). For example, R1.8 cm 18mm, TStarting pointIs 3 hours and 0 minutes, TFinal (a Chinese character of 'gan')3 hours and 25 minutes, then VGeneral assembly＝(25)*VPreparation of＝75L＝75000cm3. The total length L of the circulation line is then VGeneral assembly/(3.14*R2)＝7372.02cm。
The method for calculating the length of the circulating pipeline can be built in a water heater controller chip and used as a default method for calculating the length of the circulating pipeline. When hot water is started, the calculation method is called by default, and after calculation is finished, the result is delivered to the controller for subsequent processing. By the method, a user does not need to manually measure the length and input information into the water heater, so that more problems caused by manual adjustment of the user are avoided.
As an improvement of the above scheme, the step S20 specifically includes: and dividing the obtained length of the circulating pipeline by a value of 10 to obtain the required lift of the circulating water pump.
As an improvement of the above scheme, the step S24 specifically includes: if the maximum time is greater than the time threshold, calculating the operating flow rate v by the following formulaPump and method of operating the same：
vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerIs the minimum startup flow.
As an improvement of the above scheme, the step S25 specifically includes:
s250, if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
s251, if the maximum time is greater than the time threshold, calculating the working flow rate of the circulating water pump according to the difference value between the maximum water pump flow and the minimum starting flow;
s252, if the maximum time is less than the time threshold, using a preset working flow rate as the working flow rate of the circulating water pump; the preset working flow speed is less than the maximum water pump flow.
For example, the total water volume Vatal in the circulation line has been calculated. The minimum starting flow of the water heater is 2.5L/min, and the minimum time of the cyclic heating is 20min, so that the maximum heating time t is VGeneral assembly/2.5。
If t is>20, setting the working flow velocity vpump to be the same as the maximum water yield of the gas water heater; in this example, the maximum water yield of the gas water heater is set to 16L/min, so vPump and method of operating the same＝16L/min；
If t is<20, the working flow velocity vpump is set to be smaller than the maximum pump flowNumerical values. Can order vPump and method of operating the same＝5L/min。
The known longest time t is smaller than the said shortest time, i.e. t<20, the working flow rate vPump and method of operating the sameIs set to a value less than the maximum pump flow. The value can be obtained by additionally introducing a time threshold value T0And comparing the time with the shortest time and then accurately calculating.
For example setting T0The minimum starting flow of the water heater is 2.5L/min, the minimum time of the cyclic heating is 20min, and the preset working flow rate is 5L/min. Maximum heating time t ═ VGeneral assembly2.5, and t<20。
If T is0<t, can order vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerFor the minimum start-up flow, in this embodiment, the minimum start-up flow of the water heater is 2.5L/min, so vPump and method of operating the same＝(v1-2.5)/2。
If t is<T0Can order vPump and method of operating the sameAt 5L/min, where 5L/min is the preset operating flow rate at which the gas water heater first preheater start-up would be performed by default.
Compared with the prior art, the control method of the circulating water pump of the gas water heater disclosed by the embodiment of the invention has the advantages that the total length of the circulating pipeline in a user's home is firstly confirmed, then the theoretical rotating speed and the longest heating time of the circulating water pump which can reach the length are found out, and finally the proper rotating speed of the water pump is determined by reversely comparing the shortest heating time and the longest heating time. From the above analysis, the embodiment of the invention can effectively match the adaptive water pump rotating speed for the circulating pipeline of the user home without reducing the water pump rotating speed for many times, and avoids the problem that the normal preheating cannot be realized because the sufficient circulating flow cannot be generated due to the direct reduction of the water pump rotating speed. When the noise is reduced, because the circulating flow rate of the water pump is reduced, the combustion load of the water heater can be reduced synchronously, and the purpose of saving the gas for users is also achieved. It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A gas water heater, comprising:
one end of the circulating pipeline is communicated with a water inlet of the gas water heater, and the other end of the circulating pipeline is communicated with a water outlet of the gas water heater;
the circulating water pump is arranged in the circulating pipeline; and a process for the preparation of a coating,
a controller connected to the circulating water pump and configured to:
calculating the required lift of the circulating water pump according to the obtained length of the circulating pipeline;
obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump;
calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater;
judging whether the longest time is less than the preset shortest time for circulating heating of the circulating pipeline;
if the maximum time is longer than the minimum time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump;
if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow;
when the gas water heater is preheated, controlling the circulating water pump to work according to the determined working flow rate;
the controller is specifically configured to:
if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
if the maximum time is larger than the time threshold, calculating the working flow rate of the circulating water pump according to the difference value between the maximum water pump flow and the minimum starting flow;
if the maximum time is less than the time threshold, taking a preset working flow rate as the working flow rate of the circulating water pump; the preset working flow speed is less than the maximum water pump flow.
2. Gas water heater according to claim 1, wherein if said maximum time is greater than said time threshold, said controller calculates said operating flow rate v, in particular by the following formulaPump and method of operating the same：
vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerIs the minimum startup flow.
3. The gas water heater of claim 1, wherein the controller calculates the required head of the circulating water pump by:
and dividing the obtained length of the circulating pipeline by a value of 10 to obtain the required lift of the circulating water pump.
4. The gas water heater of claim 1, wherein the controller is further configured to:
when the preheating function of the gas water heater is started for the first time, the rotating speed v of a preset preheating water pump is usedPreparation ofControlling the circulating water pump to work and recording the time T when the preheating is startedStarting point；
When the temperature of the water in the circulating pipeline is heated to a preset target temperature, stopping preheating, and recording the time T at the momentFinal (a Chinese character of 'gan')；
Calculating the first preheat cycle duration TGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
According to the duration T of the first preheating cycleGeneral assemblyCalculating to obtain the volume V of water in the circulating pipelineGeneral assembly＝vPreparation of*TGeneral assembly；
According to the volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Wherein R is the pipe inside radius of the circulation pipe.
5. A control method of a circulating water pump of a gas water heater is characterized by comprising the following steps:
calculating the required lift of the circulating water pump according to the obtained length of the circulating pipeline;
obtaining the maximum water pump flow of the circulating water pump under the lift according to the preset relation between the lift of the circulating water pump and the maximum water pump flow of the circulating water pump;
calculating the maximum time of the circulating heating of the circulating pipeline according to the obtained water quantity in the circulating pipeline and the minimum starting flow of the gas water heater;
judging whether the longest time is less than the preset shortest time for circulating heating of the circulating pipeline;
if the maximum time is longer than the minimum time, taking the preset maximum water yield of the gas water heater as the working flow rate of the circulating water pump;
if the longest time is less than the shortest time, setting the working flow speed of the circulating water pump to be less than the maximum water pump flow;
when the gas water heater is preheated, controlling the circulating water pump to work according to the determined working flow rate;
if the maximum time is less than the minimum time, setting the working flow rate of the circulating water pump to be less than the maximum water pump flow, including:
if the longest time is less than the shortest time, judging whether the longest time is greater than a preset time threshold value; the time threshold is less than the minimum time;
if the maximum time is larger than the time threshold, calculating the working flow rate of the circulating water pump according to the difference value between the maximum water pump flow and the minimum starting flow;
if the maximum time is less than the time threshold, taking a preset working flow rate as the working flow rate of the circulating water pump; the preset working flow speed is less than the maximum water pump flow.
6. Method for controlling a circulating water pump of a gas water heater according to claim 5, characterized in that if said maximum time is greater than said time threshold value, said operating flow rate v is calculated by the following formulaPump and method of operating the same：
vPump and method of operating the same＝(v1-vOpener) 2; wherein v is1Is the maximum water pump flow, vOpenerIs the minimum startup flow.
7. The method for controlling a circulating water pump of a gas water heater according to claim 5, wherein the calculating a required head of the circulating water pump based on the obtained length of the circulating pipeline comprises:
and dividing the obtained length of the circulating pipeline by a value of 10 to obtain the required lift of the circulating water pump.
8. The method for controlling a circulating water pump of a gas water heater as claimed in claim 5, wherein before said calculating a required lift of said circulating water pump based on the obtained length of said circulating line, said method further comprises:
when the preheating function of the gas water heater is started for the first time, the rotating speed v of a preset preheating water pump is usedPreparation ofControlling the circulating water pump to work and recording the time T when the preheating is startedStarting point；
When the temperature of the water in the circulating pipeline is heated to a preset target temperature, stopping preheating, and recording the time T at the momentFinal (a Chinese character of 'gan')；
Calculating the first preheat cycle duration TGeneral assembly＝TFinal (a Chinese character of 'gan')-TStarting point；
According to the duration T of the first preheating cycleGeneral assemblyCalculating to obtain the volume V of water in the circulating pipelineGeneral assembly＝vPreparation of*TGeneral assembly(ii) a According to the volume VGeneral assemblyCalculating the length L of the circulating pipeline as VGeneral assembly/(3.14*R2) (ii) a Wherein R is the pipe inside radius of the circulation pipe.
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| CN113357822A (en) * | 2021-06-04 | 2021-09-07 | 海信(广东)厨卫系统股份有限公司 | Control method and control device of water heater |
| CN114264075B (en) * | 2021-08-24 | 2023-01-20 | 佛山市顺德区美的饮水机制造有限公司 | Instantaneous heating device, control method and control device thereof, water treatment device and medium |
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| JP2014025634A (en) * | 2012-07-26 | 2014-02-06 | Noritz Corp | Heat source |
| CN104482655B (en) * | 2014-11-19 | 2018-11-06 | 珠海格力电器股份有限公司 | The control method and device of water heater |
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