CN111912119A - Control method for pressurization function of gas water heater and gas water heater - Google Patents

Control method for pressurization function of gas water heater and gas water heater Download PDF

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Publication number
CN111912119A
CN111912119A CN202010797845.3A CN202010797845A CN111912119A CN 111912119 A CN111912119 A CN 111912119A CN 202010797845 A CN202010797845 A CN 202010797845A CN 111912119 A CN111912119 A CN 111912119A
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pump
water
heating
shut
temperature
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郭灵华
张松涛
郑来松
邓飞忠
仇明贵
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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Priority to CN202010797845.3A priority Critical patent/CN111912119A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)

Abstract

The invention discloses a control method of a pressurization function of a gas water heater and the gas water heater, wherein the control method comprises the following steps: s1: starting a pressurization function; s2: judging whether the water flow detected by the water flow sensor is larger than or equal to the starting-up water flow, if so, igniting to start up and starting the water pump; if not, returning to the step S1; s3: judging whether the water flow is smaller than shutdown water flow according to the water flow detected by the water flow sensor in real time, if so, shutting down and extinguishing the water pump, and turning off the water pump; if not, the flow proceeds to step S4: s4: detecting the water inlet temperature in real time according to the temperature probe, and judging whether the water inlet temperature rise is greater than the pump-closing temperature difference delta T in unit timeShut off the pumpIf not, the operation of the supercharging function is maintained and the step S3 is returned to; if yes, the water pump is turned off and the process goes to step S5; s5: judging whether the water flow is smaller than shutdown water flow according to the water flow detected by the water flow sensor, if so, shutting down and extinguishingFire; if not, the water pump is restarted.

Description

Control method for pressurization function of gas water heater and gas water heater
Technical Field
The invention relates to the technical field of pressurization control of gas water heaters, in particular to a control method for a pressurization function of a gas water heater and the gas water heater.
Background
At present, the zero-cold-water gas water heater becomes a trend of the water heater industry because the zero-cold-water gas water heater can realize that hot water can be used immediately after being started, but most zero-cold-water gas water heaters on the market do not have a water quantity pressurization function, and the specific reasons are as follows:
the control logic of the pressurization function of the conventional pressurization type gas water heater on the market is as follows, and the pump starting condition is as follows: after the pressurization function is started, when the water flow measured by a water flow sensor of the water heater is larger than the pump-on water flow (about 2.5L/min), the water pump is started for pressurization. And (3) pump-off conditions: in the boost mode of operation, when the measured water flow rate is less than the pump off water flow rate (about 2.0L/min), the water pump is turned off and shut down.
The zero-cold water heater needs to be provided with an external water return pipeline, and when the preheating function is started, the built-in circulating pump operates to drive the stored water of the hot water pipe and the water return pipe to circularly flow and realize preheating.
Under the condition of having a backwater circulation pipeline, the pressure boosting function is started, and under the pumping action of the built-in circulation pump, part of hot water flows back to the water inlet end of the water heater through the backwater pipe. When a user closes the hot water faucet, the stored water in the pipeline circularly flows under the action of the water pump, the phenomenon that the circulating flow (generally 3.5-5L/min) is higher than the shutdown water flow of the water heater can exist, the stored water is continuously heated, the pump is shut down until the outlet water temperature reaches the high-temperature protection temperature (about 75 ℃), and a large amount of gas and electric power are wasted; when the user reopens the hot water faucet, the temperature of the discharged water is too hot, which is very easy to cause scalding accidents. .
Disclosure of Invention
The invention aims to solve at least one of the problems in the prior related art to a certain extent, and therefore provides a control method for the pressurization function of a gas water heater and the gas water heater.
A control method for the pressurization function of a gas water heater comprises a controller, a temperature probe arranged at the water inlet end of a main water channel of the gas water heater, and a water pump and a water flow sensor which are respectively arranged on the main water channel of the gas water heater, and comprises the following steps:
s1: starting a pressurization function;
s2: judging whether the water flow detected by the water flow sensor is larger than or equal to the starting-up water flow, if so, igniting to start up and starting the water pump; if not, returning to the step S1;
s3: judging whether the water flow is smaller than shutdown water flow according to the water flow detected by the water flow sensor in real time, if so, shutting down and extinguishing the water pump, and turning off the water pump; if not, the flow proceeds to step S4:
s4: detecting the water inlet temperature in real time according to the temperature probe, and judging whether the water inlet temperature rise is greater than the pump-closing temperature difference delta T in unit timeShut off the pumpIf not, the operation of the supercharging function is maintained and the step S3 is returned to; if yes, the water pump is turned off and the process goes to step S5;
s5: judging whether the water flow detected by the water flow sensor is smaller than shutdown water flow, if so, shutting down and extinguishing; if not, the water pump is restarted, the pressurization function is maintained to operate, and the step S3 is returned.
Further, in step S4, the temperature rise of the water inlet per unit time is T according to the formulaInto-T′IntoTo determine, in the formula, TIntoIs the water inlet temperature, T 'measured by the temperature probe in real time'IntoIs the inlet water temperature measured before the unit time.
Further, the pump-off temperature difference Delta TShut off the pumpDelta T temperature difference from heatingHeating ofHaving a direct proportional linear relationship, said heating temperature difference Δ THeating ofAccording to the formula Δ THeating ═ heatingTIs provided with-TIntoTo determine, in the formula, TIs provided withTo set the temperature, TIntoAnd the water inlet temperature is measured by the temperature probe in real time.
Further, the pump-off temperature difference Delta TShut off the pumpDetermined according to the following formula:
when Δ THeating of＜△THeating for minTime, delta TShut off the pump＝△TShut off pump min；
When Δ THeating for min≤△THeating of≤△THeating maxTime, delta TShut off the pump＝(△TShut off pump max-△TShut off pump min)*(△THeating of-△THeating for min)/(△THeating max-△THeating for min)+△TShut off pump min；
When Δ THeating of＞△THeating maxTime, delta TShut off the pump＝△TShut off pump max；
In the formula, Delta THeating for minSetting a minimum heating temperature differential, Δ T, for a programHeating maxSetting the maximum heating temperature difference, Delta T, for the programShut off pump minFor minimum temperature difference of pump shut-in, Delta TShut off pump maxFor maximum pump-off temperature difference, Delta THeating for minCorresponding delta TShut off pump min，△THeating maxCorresponding delta TShut off pump max。
Further, the program sets a minimum heating temperature difference Δ THeating for minThe program sets the maximum heating temperature difference DeltaTHeating maxMinimum pump-off temperature difference delta TShut off pump minAnd maximum pump-off temperature difference delta TShut off pump maxAre all fixed values or are set according to the parameter setting mode of the controller.
Further, the pump-off temperature difference Delta TShut off the pumpIs a fixed value or is set according to the parameter setting mode of the controller.
The utility model provides a gas water heater, is in including gas water heater body, setting the temperature probe, the setting of the end of intaking in the main water route of gas water heater body are in operation display on the gas water heater body, set up respectively water pump and rivers sensor and setting on the main water route of gas water heater body are in this internal controller that is equipped with of gas water heater, the controller respectively with temperature probe, operation display, water pump and rivers sensor electricity are connected, the controller has as above at least gas water heater pressure boost function's control method at least.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. in a pressurization mode with a return water circulation pipeline, the pump is quickly turned off by monitoring return water temperature rise after water is turned off, the fuel gas power consumption is saved, and the water temperature is prevented from being excessively hot when water is used again.
2. The pump-off temperature difference is self-adaptive according to the difference between the set temperature and the inlet water temperature, intelligent identification is realized, and the requirements of different water temperatures in four seasons are met.
Drawings
FIG. 1 is a flow chart of a method of controlling the pressurization function of a gas water heater according to the present invention;
FIG. 2 is a schematic diagram showing the relationship between the temperature difference between the pump and the heating temperature difference in the control method for the pressurization function of the gas water heater according to the present invention;
fig. 3 is a schematic diagram of the structure of a gas water heater and its external connecting pipeline according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the claims of the present invention.
As shown in fig. 1-2, a method for controlling a pressurization function of a gas water heater includes a controller, a temperature probe disposed at a water inlet end of a main water path of the gas water heater, and a water pump and a water flow sensor respectively disposed on the main water path of the gas water heater, wherein a water return pipe is disposed between an external hot water pipe and a cold water pipe of the gas water heater to realize water circulation preheating in a pipeline of the gas water heater, and a check valve is disposed on the water return pipe to prevent water in the external cold water pipe from flowing into the external hot water pipe, and the method includes the following steps:
s1: starting a pressurization function;
s2: judging whether the water flow detected by the water flow sensor is larger than or equal to the starting-up water flow, if so, igniting to start up and starting the water pump; if not, returning to the step S1;
s3: judging whether the water flow is smaller than shutdown water flow according to the water flow detected by the water flow sensor in real time, if so, shutting down and extinguishing the water pump, and turning off the water pump; if not, the flow proceeds to step S4:
s4: detecting the water inlet temperature in real time according to the temperature probe, and judging whether the water inlet temperature rise is greater than the pump-closing temperature difference delta T in unit timeShut off the pumpIf not, the operation of the supercharging function is maintained and the step S3 is returned to; if yes, the water pump is turned off and the process goes to step S5;
s5: judging whether the water flow detected by the water flow sensor is smaller than shutdown water flow, if so, shutting down and extinguishing; if not, the water pump is restarted, the pressurization function is maintained to operate, and the step S3 is returned.
When the water pump is used, a user sets temperature and starts a pressurization mode, whether the water flow reaches the starting water flow is judged according to the water flow detected by the water flow sensor in real time, if yes, the water pump is started to ignite and started, in the using process, the water flow sensor keeps detecting the water flow in real time, and when the water flow is smaller than the stopping water flow, the water pump is stopped and shut down; when the water flow is not less than the shutdown water flow, judging whether the water inlet temperature rise is greater than the pump shutdown temperature difference Delta T in unit timeShut off the pumpIf not, the operation of the pressurization function is maintained; if so, turning off the water pump and detecting whether the water flow is smaller than the shutdown water flow, if so, turning off and extinguishing; if not, the water pump is restarted and the operation of the pressurization function is maintained, and in the pressurization mode with the return water circulation pipeline, the quick pump shutdown action is realized by monitoring the temperature rise of the return water after the water is shut down, the power consumption of fuel gas is saved, and the water temperature is prevented from being excessively hot when water is reused; the pump-off temperature difference is self-adaptive according to the difference between the set temperature and the inlet water temperature, intelligent identification is realized, and the requirements of different water temperatures in four seasons are met.
In step S4, the temperature rise of the water inlet per unit time is TInto-T′IntoTo determine, in the formula, TIntoIs the water inlet temperature, T 'measured by the temperature probe in real time'IntoThe water inlet temperature is measured before the unit time, and the unit time is generally 20 s-60 s.
The temperature difference delta T of the pump closingShut off the pumpDelta T temperature difference from heatingHeating ofHas a direct proportional linear relation, a heating temperature difference Delta THeating ofThe higher the pump is, the pump-off temperature difference Delta TShut off the pumpThe water temperature is increased along with the increase of the water temperature, so that the water temperature is suitable for different bath water temperatures all the year round. In summer, the ambient temperature and the inlet water temperature are higher, the bathing temperature set by the user is lower, and the heating temperature difference delta THeating ofSmaller and smaller matched pump-off temperature difference Delta TShut off the pumpThe pump can be stopped quickly after water is shut down, and meanwhile, the phenomenon that the pump is shut down mistakenly due to high water inlet temperature can be avoided; in winter, the ambient temperature and the water inlet temperature are lower, the bathing temperature set by a user is higher, and the heating temperature difference delta THeating ofLarger and matched larger pump-off temperature difference delta TShut off the pumpThe pump is quickly stopped after water is shut down, unnecessary gas and electricity consumption is reduced, and user misunderstanding is also reduced, wherein the heating temperature difference delta THeating ofAccording to the formula Δ THeating ═ heatingTIs provided with-TIntoTo determine, in the formula, TIs provided withTo set the temperature, TIntoAnd the water inlet temperature is measured by the temperature probe in real time.
The temperature difference delta T of the pump closingShut off the pumpDetermined according to the following formula:
when Δ THeating of＜△THeating for minTime, delta TShut off the pump＝△TShut off pump min；
When Δ THeating for min≤△THeating of≤△THeating maxTime, delta TShut off the pump＝(△TShut off pump max-△TShut off pump min)*(△THeating of-△THeating for min)/(△THeating max-△THeating for min)+△TShut off pump min；
When Δ THeating of＞△THeating maxTime, delta TShut off the pump＝△TShut off pump max；
In the formula, Delta THeating for minSet up for the programMinimum heating temperature difference, Δ THeating maxSetting the maximum heating temperature difference, Delta T, for the programShut off pump minFor minimum temperature difference of pump shut-in, Delta TShut off pump maxFor maximum pump-off temperature difference, Delta THeating for minCorresponding delta TShut off pump min，△THeating maxCorresponding delta TShut off pump max。
The procedure set minimum heating temperature difference DeltaTHeating for minThe program sets the maximum heating temperature difference DeltaTHeating maxMinimum pump-off temperature difference delta TShut off pump minAnd maximum pump-off temperature difference delta TShut off pump maxAre all fixed values or are set according to the parameter setting mode of the controller.
The temperature difference delta T of the pump closingShut off the pumpThe pump-off temperature difference Delta T is set for a fixed value or according to the parameter setting mode of the controllerShut off the pumpThe value is generally a fixed value of 5 ℃ to 10 ℃.
As shown in fig. 3, a gas water heater includes a gas water heater body 1, a temperature probe 2 disposed at a water inlet end of a main water path of the gas water heater body 1, an operation display 3 disposed on the gas water heater body 1, a water pump 4 and a water flow sensor 5 disposed on the main water path of the gas water heater body 1, and a controller 6 disposed in the gas water heater body 1, wherein the controller 6 is electrically connected to the temperature probe 2, the operation display 3, the water pump 4 and the water flow sensor 5, the operation display 3 is provided with a temperature-setting temperature-raising key and a temperature-lowering key, a preheating key for opening a preheating circulation function, and a pressure-increasing key for opening a pressure-increasing function, and a pipeline of the preheating circulation function of the gas water heater body 1 includes: the gas water heater comprises a gas water heater body 1, a water return pipe 7 arranged between an external hot water pipe and an external cold water pipe of the gas water heater body 1, wherein a water path of the gas water heater body 1 can form a circulation loop through the arrangement of the water return pipe 7, so that circulation preheating is realized through a water pump 4, a check valve 8 for preventing the external cold water pipe from flowing back to the external hot water pipe is arranged on the water return pipe 7, and the controller 6 at least has the control method for the pressurization function of the gas water heater.
The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only the most preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims (7)

1. A control method for the pressurization function of a gas water heater comprises a controller, a temperature probe arranged at the water inlet end of a main water channel of the gas water heater, and a water pump and a water flow sensor which are respectively arranged on the main water channel of the gas water heater, and is characterized by comprising the following steps:
s1: starting a pressurization function;
s2: judging whether the water flow detected by the water flow sensor is larger than or equal to the starting-up water flow, if so, igniting to start up and starting the water pump; if not, returning to the step S1;
s3: judging whether the water flow is smaller than shutdown water flow according to the water flow detected by the water flow sensor in real time, if so, shutting down and extinguishing the water pump, and turning off the water pump; if not, the flow proceeds to step S4:
s4: detecting the water inlet temperature in real time according to the temperature probe, and judging whether the water inlet temperature rise is greater than the pump-closing temperature difference delta T in unit timeShut off the pumpIf not, the operation of the supercharging function is maintained and the step S3 is returned to; if yes, the water pump is turned off and the process goes to step S5;
s5: judging whether the water flow detected by the water flow sensor is smaller than shutdown water flow, if so, shutting down and extinguishing; if not, the water pump is restarted, the pressurization function is maintained to operate, and the step S3 is returned.
2. The method of claim 1, wherein in step S4, the temperature rise of the water inlet per unit time is TInto-T′IntoTo determine, in the formula, TIntoIs the water inlet temperature, T 'measured by the temperature probe in real time'IntoIs a unit ofAnd measuring the temperature of the inlet water before the time.
3. Method for controlling the pressurization function of a gas water heater according to claim 1 or 2, characterized in that said pump-off temperature difference Δ TShut off the pumpDelta T temperature difference from heatingHeating ofHaving a direct proportional linear relationship, said heating temperature difference Δ THeating ofAccording to the formula Δ THeating ═ heatingTIs provided with-TIntoTo determine, in the formula, TIs provided withTo set the temperature, TIntoAnd the water inlet temperature is measured by the temperature probe in real time.
4. Method for controlling the pressurization function of a gas water heater according to claim 3, characterized in that said pump-off temperature difference Δ TShut off the pumpDetermined according to the following formula:
when Δ THeating of＜△THeating for minTime, delta TShut off the pump＝△TShut off pump min；
When Δ THeating for min≤△THeating of≤△THeating maxTime, delta TShut off the pump＝(△TShut off pump max-△TShut off pump min)*(△THeating of-△THeating for min)/(△THeating max-△THeating for min)+△TShut off pump min；
When Δ THeating of＞△THeating maxTime, delta TShut off the pump＝△TShut off pump max；
In the formula, Delta THeating for minSetting a minimum heating temperature differential, Δ T, for a programHeating maxSetting the maximum heating temperature difference, Delta T, for the programShut off pump minFor minimum temperature difference of pump shut-in, Delta TShut off pump maxFor maximum pump-off temperature difference, Delta THeating for minCorresponding delta TShut off pump min，△THeating maxCorresponding delta TShut off pump max。
5. Method for controlling the pressurization function of a gas water heater according to claim 4, characterized in that said program sets a minimum heating temperature difference Δ THeating for minThe program sets the maximum heating temperature difference△THeating maxMinimum pump-off temperature difference delta TShut off pump minAnd maximum pump-off temperature difference delta TShut off pump maxAre all fixed values or are set according to the parameter setting mode of the controller.
6. Method for controlling the pressurization function of a gas water heater according to claim 1, characterized in that said pump-off temperature difference Δ TShut off the pumpIs a fixed value or is set according to the parameter setting mode of the controller.
7. A gas water heater comprises a gas water heater body (1), a temperature probe (2) arranged at the water inlet end of a main water path of the gas water heater body (1), an operation display (3) arranged on the gas water heater body (1), a water pump (4) and a water flow sensor (5) which are respectively arranged on the main water path of the gas water heater body (1), and a controller (6) arranged in the gas water heater body (1), wherein the controller (6) is respectively electrically connected with the temperature probe (2), the operation display (3), the water pump (4) and the water flow sensor (5), and the gas water heater is characterized in that the controller (6) at least comprises the control method for the pressurization function of the gas water heater according to any one of claims 1 to 6.
CN202010797845.3A 2020-08-10 2020-08-10 Control method for pressurization function of gas water heater and gas water heater Pending CN111912119A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112443983A (en) * 2020-11-25 2021-03-05 宁波方太厨具有限公司 Circulation control method and system of water heater
CN112963968A (en) * 2021-03-22 2021-06-15 华帝股份有限公司 Control method for zero cold water pressurization of gas water heater
CN113154690A (en) * 2021-04-27 2021-07-23 华帝股份有限公司 Control method of water heater and water heater
CN113865111A (en) * 2021-10-27 2021-12-31 华帝股份有限公司 Control method for pressurization function of gas water heater
CN114234453A (en) * 2021-09-26 2022-03-25 华帝股份有限公司 Fluctuating temperature control method of gas water heater and gas water heater

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112443983A (en) * 2020-11-25 2021-03-05 宁波方太厨具有限公司 Circulation control method and system of water heater
CN112443983B (en) * 2020-11-25 2022-05-03 宁波方太厨具有限公司 Circulation control method and system of water heater
CN112963968A (en) * 2021-03-22 2021-06-15 华帝股份有限公司 Control method for zero cold water pressurization of gas water heater
CN113154690A (en) * 2021-04-27 2021-07-23 华帝股份有限公司 Control method of water heater and water heater
CN114234453A (en) * 2021-09-26 2022-03-25 华帝股份有限公司 Fluctuating temperature control method of gas water heater and gas water heater
CN114234453B (en) * 2021-09-26 2023-03-07 华帝股份有限公司 Fluctuating temperature control method of gas water heater and gas water heater
CN113865111A (en) * 2021-10-27 2021-12-31 华帝股份有限公司 Control method for pressurization function of gas water heater

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