CN111426051A - Gas water heater with current limiting device and control method thereof - Google Patents
Gas water heater with current limiting device and control method thereof Download PDFInfo
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- CN111426051A CN111426051A CN202010217853.6A CN202010217853A CN111426051A CN 111426051 A CN111426051 A CN 111426051A CN 202010217853 A CN202010217853 A CN 202010217853A CN 111426051 A CN111426051 A CN 111426051A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 521
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 148
- 238000001514 detection method Methods 0.000 claims description 27
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 239000002737 fuel gas Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000008399 tap water Substances 0.000 description 16
- 235000020679 tap water Nutrition 0.000 description 16
- 238000003287 bathing Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—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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- 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
-
- 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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- General Engineering & Computer Science (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
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Abstract
The invention discloses a gas water heater with a flow limiting device and a control method thereof, the gas water heater comprises a controller, a heat exchanger, a water inlet pipe and a water outlet pipe, two ends of the heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe, a water mixing pipe is connected between the water inlet pipe and the water outlet pipe, the water inlet pipe is provided with the flow limiting device, the flow limiting device is positioned at the rear end of the connection part of the water mixing pipe and the water inlet pipe, the flow limiting device comprises a flow limiting valve body, two ends of the flow limiting valve body are respectively provided with a flow limiting water inlet and a flow limiting water outlet, a main water path and a bypass water path which are connected in parallel are arranged in the flow limiting valve body, a main path electromagnetic valve is arranged on the flow limiting valve body and is used for conducting or cutting off the main water path, and the water waste is reduced.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a gas water heater with a current limiting device and a control method thereof.
Background
In the related technology, when a user opens a hot water faucet for the first time, tap water flows into the gas water heater, at the moment, a water flow sensing device of a main water channel of the gas water heater monitors that water flows through the water flow sensing device, a gas valve is opened to ventilate and ignite to heat tap water, the opening of the gas valve is controlled according to the difference value of preset temperature and water outlet temperature, so that the water outlet temperature gradually reaches the preset temperature of the gas water heater, and constant-temperature hot water output is realized. The time interval from the monitoring of water flow to the ignition of the gas water heater is at least more than 2 seconds, the time of about 20 seconds is still needed after the ignition is carried out until the water outlet temperature reaches the preset temperature, and in addition, a certain time is needed when hot water flows to a hot water faucet through a hot water pipe, and the time depends on the length of the pipeline and the water flow rate; therefore, after a hot water faucet is opened, a section of cold water flows out firstly and then hot water flows out, the time from opening the hot water faucet to comfortable hot water flowing out is usually more than 30 seconds, and a user needs to wait for the cold water to be completely discharged to use the hot water, so that a large amount of tap water is wasted. Particularly, in winter, as the temperature of tap water is low, the water temperature required by a user is high, the heating time of the gas water heater is prolonged, and the time for the user to wait for hot water is correspondingly prolonged, so that the user is easy to catch cold and get cold, and more tap water is wasted.
In addition, when the water is shut off during bathing of a user, the heat exchange fins still transmit waste heat to the stored water in the heat exchanger after the gas water heater is flamed out, and a section of high-temperature water is formed. Generally, the larger the firepower before flameout is, the higher the temperature rise of stored water is, and in severe cases, the stored water temperature is as high as more than 60 ℃, which is very easy to cause high-temperature scald accidents. When the common gas water heater is used, water is shut off halfway and restarted, after the hot water faucet finishes the original hot stored water in the hot water pipe section, the hot stored water flows out of the heat exchanger, then the high-temperature stored water flows out of the heat exchanger, and then a section of low-temperature tap water which is not heated so as to cause the phenomenon of sudden rising and falling of water temperature.
It can be seen that the common gas water heater has the following defects: the first startup is slow in hot water discharge, and excessive cold water needs to be discharged; the water is shut off halfway and restarted, the water-stopping temperature is raised too high, and the water is suddenly heated and quenched, so that the bathing safety is influenced, and the water resource is wasted.
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 the invention provides a gas water heater with a flow limiting device, which can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and reduce the water waste.
The above purpose is realized by the following technical scheme:
a gas water heater with a flow limiting device comprises a controller, a heat exchanger, a water inlet pipe and a water outlet pipe, wherein two ends of the heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe, a water mixing pipe is connected between the water inlet pipe and the water outlet pipe, the water inlet pipe is provided with the flow limiting device, the flow limiting device is positioned at the rear end of the joint of the water mixing pipe and the water inlet pipe, the flow limiting device comprises a flow limiting valve body, two ends of the flow limiting valve body are respectively provided with a flow limiting water inlet and a flow limiting water outlet, a main water path and a bypass water path which are connected in parallel are arranged in the flow limiting valve body, two ends of the main water path are respectively communicated with the flow limiting water inlet and the flow limiting water outlet, two ends of the bypass water path are respectively communicated with the flow limiting water inlet, the main circuit electromagnetic valve is electrically connected with the controller.
In some embodiments, the main waterway is restricted by a greater amount than the bypass waterway.
In some embodiments, a flow stabilizing valve core is arranged in the bypass waterway, and the flow limiting value of the flow stabilizing valve core is larger than the starting water flow of the gas water heater.
In some embodiments, the pipe diameter of the water mixing pipe is 3 to 5mm, and the pipe diameter of the water inlet pipe is 10 to 16 mm.
In some embodiments, a water flow detection device is arranged on the water inlet pipe, the water flow detection device is arranged at the front end of the joint of the water mixing pipe and the water inlet pipe, a water outlet temperature detection device is arranged on the water outlet pipe, the water outlet temperature detection device is arranged at the rear end of the joint of the water mixing pipe and the water outlet pipe, and the controller is electrically connected with the water flow detection device and the water outlet temperature detection device respectively.
In some embodiments, the gas control device further comprises a combustor, a gas control valve and an operation display, wherein the gas control valve is communicated with an air inlet end of the combustor, and the controller is electrically connected with the gas control valve and the operation display respectively.
In some embodiments, the controller controls the gas control valve to work so that the outlet water temperature of the gas water heater reaches a preset temperature, wherein the temperature control time for the controller to control the gas control valve to work is calculated according to the following formula:
t＝(tmax-tmin)×(Tpreset of-TPreset min)/(TPreset max-TPreset min)+tmin；
Wherein, tmaxFor maximum programmed temperature control time, tminFor a minimum programmed temperature control time, TPreset ofPresetting the temperature, T, for the userPreset maxFor the programmed maximum preset temperature, TPreset minThe programmed minimum preset temperature.
In addition, the invention provides a control method of the gas water heater with the flow limiting device, which can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and improve the bathing comfort.
The above purpose is realized by the following technical scheme:
a control method of a gas water heater with a current limiting device, which is applied to the gas water heater, and comprises the following steps:
judging whether the actually measured water flow is larger than the starting-up water flow or not;
if the actually measured water flow is larger than the starting-up water flow, controlling the starting-up ignition of the gas water heater to enter a shower working mode;
the main path electromagnetic valve is controlled to cut off the main water path, and the opening degree of the gas control valve is adjusted to control the outlet water temperature;
after the first program temperature control time is reached, judging whether the outlet water temperature is greater than the preset temperature or not;
if the outlet water temperature is higher than the preset temperature, the main path electromagnetic valve is controlled to conduct the main water path, and the opening degree of the fuel gas control valve is adjusted to control the outlet water temperature.
In some embodiments, the method further comprises the steps of:
after the temperature control time of the second program is reached, judging whether the temperature of the outlet water is less than the preset temperature or not;
if the water outlet temperature is lower than the preset temperature, controlling a main path electromagnetic valve to cut off a main water path, and adjusting the opening of a gas control valve to control the water outlet temperature;
if the water outlet temperature is higher than the preset temperature, whether the measured water flow is smaller than the shutdown water flow or not is judged, if the measured water flow is larger than the shutdown water flow, the opening degree of the gas control valve is continued to control the water outlet temperature, and if the measured water flow is smaller than the shutdown water flow, the gas water heater is controlled to shut down and shut down to exit the shower working mode, and the main-path electromagnetic valve is controlled to cut off the main water path.
In some embodiments, the step of determining whether the temperature of the outlet water is greater than the preset temperature after the first program temperature control time is reached includes:
if the water outlet temperature is lower than the preset temperature, whether the measured water flow is lower than the shutdown water flow or not is judged, if the measured water flow is higher than the shutdown water flow, the opening of the gas control valve is continued to control the water outlet temperature, if the measured water flow is lower than the shutdown water flow, the gas water heater is controlled to shut down and shut down, the shower operating mode is quitted, and the main-path electromagnetic valve is controlled to cut off the main water path.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the gas water heater with the current limiting device can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and reduce the water waste;
2. the control method of the gas water heater with the flow limiting device can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and improve the bathing comfort.
Drawings
FIG. 1 is a schematic structural diagram of a gas water heater in a small water shift state in an embodiment;
FIG. 2 is a schematic structural diagram of a gas water heater in a large water gear state in the embodiment;
FIG. 3 is a schematic view showing the structure of a current limiting device according to an embodiment;
FIG. 4 is a flowchart illustrating a control method according to an embodiment;
FIG. 5 is a graph of water flow rate variation during startup of the gas water heater in the embodiment;
FIG. 6 is a graph showing the variation of the outlet water temperature at the first start-up of the gas water heater in the embodiment;
FIG. 7 is a graph of the temperature change of the water during the water-off restart of the gas water heater in the embodiment;
FIG. 8 is a graph of programmed temperature control time versus preset temperature for a gas water heater in accordance with an embodiment.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.
The first embodiment is as follows: as shown in fig. 1 to 8, the present embodiment provides a gas water heater with a current limiting device, including a controller 1, a heat exchanger 2, a water inlet pipe 3, a water outlet pipe 4, a burner 9, a gas control valve 10 and an operation display 11, wherein two ends of the heat exchanger 2 are respectively connected to the water inlet pipe 3 and the water outlet pipe 4, a water inlet joint is arranged at a water inlet end of the water inlet pipe 3, a water outlet joint is arranged at a water outlet end of the water outlet pipe 4, the heat exchanger 2 is used for absorbing high-temperature flue gas heat and heating tap water, the gas control valve 10 is communicated with a gas inlet end of the burner 9, specifically, the gas control valve 10 is installed on a gas supply passage inside the gas water heater and can control on-off and gas opening degree to meet the requirement of constant temperature of hot water, the operation display 11 is provided with a temperature setting key for setting a preset temperature, a water, the water mixing pipe 5 and the main water path flowing through the inside of the heat exchanger 2 form a parallel water path, a flow limiting device 6 is arranged on the water inlet pipe 3 for controlling the water flow of the water inlet pipe 3, the flow limiting device 6 is arranged at the rear end of the connection part of the water mixing pipe 5 and the water inlet pipe 3, the flow limiting device 6 comprises a flow limiting valve body 601, a flow limiting water inlet 602 and a flow limiting water outlet 603 are respectively arranged at the two ends of the flow limiting valve body 601, a main water path 604 and a bypass water path 605 which are connected in parallel are arranged in the flow limiting valve body 601, the flow limiting amount of the main water path 604 is larger than that of the bypass water path 605, the two ends of the main water path 604 are respectively communicated with the flow limiting water inlet 602 and the flow limiting water outlet 603, a main electromagnetic valve 606 for conducting or mainly cutting off the water path 604 is arranged on the flow limiting valve body 601, the main electromagnetic valve 606 is electrically connected with the controller, when the main solenoid valve 606 is closed, the tap water flows through the bypass water path 605 to reduce the flow rate of the water flowing through the flow restricting device 6. Be provided with rivers detection device 7 on inlet tube 3, rivers detection device 7 is located the junction front end of mixing water pipe 5 and inlet tube 3, rivers detection device 7 can real-time supervision through gas heater's the water flow, be provided with leaving water temperature detection device 8 on outlet pipe 4, leaving water temperature detection device 8 is located the junction rear end of mixing water pipe 5 and outlet pipe 4, controller 1 respectively with rivers detection device 7, it is last water temperature detection device 8, gas control valve 10 and operation display 11 electric connection.
The gas water heater with the current limiting device can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and reduce the water waste.
Specifically, the gas water heater of the embodiment can overcome the defects of the prior art, automatically limits the water flow after the gas water heater is started, accelerates the temperature rise of hot water, shortens the waiting time of the hot water, effectively inhibits the sudden rise and drop of the water temperature after the water is shut off halfway and restarted, improves the bathing comfort, reduces the water waste, and is suitable for household hot water supply gas instantaneous water heaters and dual-purpose furnaces.
In the embodiment, a flow stabilizing valve core 607 is arranged in the bypass water passage 605, and the flow limiting value of the flow stabilizing valve core 607 is greater than the starting water flow of the gas water heater, the water flow passing through the bypass water passage 605 can be more stable by the arranged flow stabilizing valve core 607, the phenomenon that the water flow is suddenly reduced is reduced, when the main electromagnetic valve 606 is closed, the water flow of the flow limiting device 6 is reduced by the tap water passing through the flow stabilizing valve core 607 of the bypass water passage 605, the flow limiting value of the flow stabilizing valve core 607 of the embodiment is generally 3-6L/min, which is higher than the starting water flow of the gas water heater, and the starting water flow of the gas water heater is generally 2.5L/min.
Preferably, the pipe diameter of the water mixing pipe 5 is 3 to 5mm, and the pipe diameter of the water inlet pipe 3 is 10 to 16mm, so that when the gas water heater is started, the flow dividing proportion of the water mixing pipe 5 reaches a proper proportion, and preferably, the flow dividing proportion is less than 15%.
As shown in fig. 1 and fig. 2, in the present embodiment, switching between the large and small water gears can be achieved by controlling the switch of the main solenoid valve 606 of the flow limiting device 6, as shown in fig. 1, when the gas water heater of the present embodiment is in the small water gear, the main solenoid valve 606 of the flow limiting device 6 is closed, after the hot water faucet is opened, the tap water enters the gas water heater, flows through the water flow detection device 7, flows through the water inlet pipe 3 and the water mixing pipe 5, then flows through the water outlet temperature detection device 8 and the water outlet joint again, and finally flows to the hot water faucet, when the tap water flow of the water inlet pipe 3 is limited by the tap water stabilizing valve plug 607 of the bypass water path 605 of the flow limiting device 6, the maximum water flow of the small water gear of the gas water heater of the present embodiment is the sum of the flow limiting value of the tap water stabilizing valve plug 607 and the flow of the water mixing pipe 5, which is generally 5 to main path 8L/min, as shown in fig. 2, when the gas water heater of the present embodiment is in the large water gear, the maximum water flow of the gas water heater is 16L.
As shown in fig. 4, the gas water heater of the present embodiment has the following control principle:
(1) when the gas water heater is in a shower standby mode, the main path electromagnetic valve 606 of the flow limiting device 6 is closed, and the gas water heater is in a small water gear position, at the moment, a hot water faucet is opened, tap water enters the gas water heater and flows through the water flow detection device 7 and then flows through the water inlet pipe 3 and the water mixing pipe 5, the water flow of the water inlet pipe 3 is limited by the flow limiting device 6, when the water flow detected by the water flow detection device 7 is larger than the program starting flow, the program starting flow is generally 2.5L/min, the controller 1 opens the gas control valve 10, the gas water heater is started to ignite, and the shower operation mode is switched to.
(2) After the gas water heater is started and ignited, the controller 1 automatically adjusts the gas opening of the gas control valve 10 according to the difference value between the outlet water temperature monitored by the outlet water temperature detection device 8 in real time and the preset temperature of the operation display 11, and changes the combustion firepower to enable the outlet water temperature of the gas water heater to be close to the preset temperature. Because the gas water heater is in a small water gear at the starting-up stage, the water flow is small, and the hot water heating speed of the gas water heater is high.
(3) When the gas water heater is in a startup temperature rise stage, the controller 1 adjusts the opening degree of the gas control valve 10 to control the temperature, and after the programmed temperature control time is reached, if the outlet water temperature detected by the outlet water temperature detection device 8 is still lower than the preset temperature of the operation display 11, the working state of the small water gear is maintained, and the main path electromagnetic valve 606 is still not opened. The temperature control time is a fixed value or is set by a parameter setting mode of the controller 1, and the value of the temperature control time is generally 5-15 s in this embodiment.
(4) The gas water heater is in a starting temperature rise stage, the controller 1 adjusts the opening degree of the gas control valve 10 to control the temperature, after the program temperature control time is reached, when the outlet water temperature detected by the outlet water temperature detection device 8 reaches the preset temperature of the operation display 11, the controller 1 opens the main path electromagnetic valve 606 of the flow limiting device 6, the water is switched to a high water gear, the hot water flow is increased, the opening degree and the combustion firepower of the gas control valve 10 are synchronously adjusted, the outlet water temperature is controlled according to the preset temperature, the high flow water circulation is recovered, and the rapid constant temperature is realized.
(5) The gas water heater is in a shower working mode of a large water gear, the controller 1 adjusts the opening degree of the gas control valve 10 to control the temperature, after the program temperature control time is reached, if the outlet water temperature is still lower than the preset temperature of the operation display 11, and at the moment, the water temperature is too low, the main path electromagnetic valve 606 of the flow limiting device 6 is closed, the water is switched to a small water gear, and the outlet water temperature is increased.
(6) The gas water heater is in a shower working mode of a small water gear, the controller 1 adjusts the opening degree of the gas control valve 10 to control the temperature, after the program temperature control time is reached, if the outlet water temperature is still higher than the preset temperature of the operation display 11, and the water temperature is too high at the moment, the main path electromagnetic valve 606 of the flow limiting device 6 is opened, the water is switched to a large water gear, and the outlet water temperature is reduced.
(7) When the gas water heater is in the shower working mode, and when the water flow detected by the water flow detection device 7 is smaller than the programmed shut-off flow, and the programmed shut-off flow of the gas hot water is generally 2.0L/min, the controller 1 closes the gas control valve 10, switches to the shower standby mode after flameout and shut-off, and closes the main solenoid valve 606 of the flow limiting device 6 to return to the low water level.
As shown in fig. 5 and 6, the gas water heater of the present embodiment is in the low water level position at the startup temperature rise stage, the water flow rate is small, the hot water temperature rise speed is high, and the hot water waiting time is shortened. The hot water can be quickly discharged by limiting the water flow when the gas water heater is started, and excessive cold water is prevented from being discharged.
As shown in fig. 7, when the gas water heater of this embodiment is in the shower operating mode, water is turned off halfway, the gas water heater is turned off, the main path electromagnetic valve 606 of the flow limiting device 6 is turned off, and the water level is switched to the low water level. After the gas water heater is switched off, the heat exchanger 2 still transfers the residual heat to the stored water in the water inlet pipe 3, thereby forming a section of high-temperature water. After the user opened hot water tap again, the running water got into gas heater reposition of redundant personnel and passes through inlet tube 3 and muddy water pipe 5, and the high temperature of inlet tube 3 is deposited water and is mixed 5 cold water of water pipe and flow from water connectors after assembling, and the cold water that mixes 5 supplements of water pipe reduces out the water temperature, effectively restraines the temperature rise of cutting off the water supply. The gas water heater of this embodiment is in little water gear at the start-up stage, and the water flow that leads to of inlet tube 3 is restricted by current limiting device 6, and high temperature deposits water flow and reduces, then mixes 5 cold water shunting proportion increase, and the leaving water temperature after the neutralization is mixed is lower, further reduces the temperature rise of cutting off the water supply. In the starting-up stage of the gas water heater of the embodiment, when water is shut down halfway and the gas water heater is restarted, the water flow of the water inlet pipe 3 is reduced, the temperature rising speed of cold water flowing into the water inlet pipe 3 is higher, and the temperature drop of hot water at the rear section of water outlet can be inhibited. As shown in fig. 7, the gas water heater of the embodiment can effectively suppress the problem of sudden rising and falling of water temperature caused by water shutdown and restart in midway through startup flow limiting and bypass water mixing, reduce water temperature fluctuation and improve hot water bathing experience.
As shown in fig. 4, when the gas water heater of this embodiment switches the water gears between the high water gear and the low water gear in the startup temperature raising stage and the shower operating mode, the fault of switching the water gears between the high water gear and the low water gear caused by abnormal water temperature can be avoided by setting the programmed temperature control time.
As shown in fig. 8, the programmed temperature control time T of the gas water heater of the present embodiment and the preset temperature T of the operation display 11Preset ofHaving a proportional linear relationship, a specific predetermined temperature TPreset ofThe higher the temperature is, the longer the program temperature control time follows, and the temperature control time is suitable for different bath water temperature requirements. E.g. a predetermined temperature TPreset ofHigher, the heat exchanger 2 stores more heat when the water is shut off midway, the time for flowing out the front-section high-temperature water after restarting is longer, and the high-temperature water after the secondary startup is slightly higher than the preset temperature TPreset ofThe determination of the program of the controller 1 is affected, so that a longer program temperature control time needs to be matched.
Programmed minimum preset temperature TPreset minTypically 35 ℃ corresponding to a minimum programmed temperature control time tminTypically 5s, programmed maximum preset temperature TPreset maxTypically 60 ℃ corresponding to a maximum programmed temperature control time tmaxTypically 15 s; programmed minimum preheating temperature TPreset minProgram maximum preset temperature TPreset maxMinimum programmed temperature control time tminAnd maximum programmed temperature control time tmaxAre fixed values or can be set by the way the parameters of the controller 1 are set.
Specifically, the controller 1 controls the gas control valve 10 to work so that the outlet water temperature of the gas water heater reaches a preset temperature, wherein the temperature control time for the controller 1 to control the gas control valve 10 to work is calculated according to the following formula:
t＝(tmax-tmin)×(Tpreset of-TPreset min)/(TPreset max-TPreset min)+tmin；
Wherein, tmaxFor maximum programmed temperature control time, tminFor a minimum programmed temperature control time, TPreset ofPresetting the temperature, T, for the userPreset maxFor the programmed maximum preset temperature, TPreset minThe programmed minimum preset temperature.
Example two: as shown in fig. 1 to 8, the present embodiment provides a control method of a gas water heater with a current limiting device, which is applied to the gas water heater according to the first embodiment, and the control method includes the following steps:
judging whether the actually measured water flow is larger than the starting-up water flow or not;
if the actually measured water flow is larger than the starting-up water flow, controlling the starting-up ignition of the gas water heater to enter a shower working mode, and specifically controlling the gas control valve 10 to be opened so as to enable the starting-up ignition of the gas water heater to enter the shower working mode;
the main path electromagnetic valve 606 is controlled to cut off the main water path 604 to enable the gas water heater to be in a small water gear, and the opening degree of the gas control valve 10 is adjusted to control the outlet water temperature;
after the first program temperature control time is reached, judging whether the outlet water temperature is greater than the preset temperature or not;
if the outlet water temperature is higher than the preset temperature, the main path electromagnetic valve 606 is controlled to conduct the main water path 604 to switch the gas water heater to a large water gear, and the opening degree of the gas control valve 10 is adjusted to control the outlet water temperature.
The control method of the embodiment can accelerate the temperature rise of hot water, shorten the waiting time of the hot water and improve the bathing comfort.
Further, the method also comprises the following steps:
after the temperature control time of the second program is reached, judging whether the temperature of the outlet water is less than the preset temperature or not;
if the water outlet temperature is lower than the preset temperature, the main path electromagnetic valve 606 is controlled to cut off the main water path 604 to enable the gas water heater to be switched to a small water gear, and the opening degree of the gas control valve is adjusted to control the water outlet temperature;
if the outlet water temperature is higher than the preset temperature, whether the measured water flow is lower than the shutdown water flow is judged, if the measured water flow is higher than the shutdown water flow, the opening degree of the gas control valve is continued to control the outlet water temperature, if the measured water flow is lower than the shutdown water flow, the gas water heater is controlled to shut down and flameout to exit from the shower working mode, namely, the gas control valve 10 is closed to enable the gas water heater to shut down and flameout to exit from the shower working mode, and the main path electromagnetic valve 606 is controlled to cut off the main water path 604 to. At the moment, the gas water heater is in a small water gear, and the flow of tap water is limited by the flow limiting device 6.
Further, after the temperature control time reaches the first program, the step of judging whether the outlet water temperature is greater than the preset temperature comprises the following steps:
if the water outlet temperature is lower than the preset temperature, whether the measured water flow is lower than the shutdown water flow is judged, if the measured water flow is higher than the shutdown water flow, the opening of the gas control valve 10 is continued to control the water outlet temperature, if the measured water flow is lower than the shutdown water flow, the gas water heater is controlled to shut down and flameout to exit from the shower working mode, namely, the gas control valve 10 is closed to enable the gas water heater to shut down and flameout to exit from the shower working mode, and the main-path electromagnetic valve 606 is controlled to cut off the main water path 604 to enable the. At the moment, the gas water heater is in a small water gear, and the flow of tap water is limited by the flow limiting device 6.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A gas water heater with a flow limiting device comprises a controller (1), a heat exchanger (2), a water inlet pipe (3) and a water outlet pipe (4), wherein two ends of the heat exchanger (2) are respectively connected with the water inlet pipe (3) and the water outlet pipe (4), the gas water heater is characterized in that a water mixing pipe (5) is connected between the water inlet pipe (3) and the water outlet pipe (4), the water inlet pipe (3) is provided with a flow limiting device (6), the flow limiting device (6) is positioned at the rear end of the joint of the water mixing pipe (5) and the water inlet pipe (3), the flow limiting device (6) comprises a flow limiting valve body (601), two ends of the flow limiting valve body (601) are respectively provided with a flow limiting water inlet (602) and a flow limiting water outlet (603), and a main water channel (604) and a bypass water channel (605) which are connected in parallel, the two ends of the main water path (604) are respectively communicated with the flow-limiting water inlet (602) and the flow-limiting water outlet (603), the two ends of the bypass water path (605) are respectively communicated with the flow-limiting water inlet (602) and the flow-limiting water outlet (603), a main path electromagnetic valve (606) is arranged on the flow-limiting valve body (601) and used for conducting or cutting off the main water path (604), and the main path electromagnetic valve (606) is electrically connected with the controller (1).
2. A gas water heater with a flow restriction device according to claim 1, characterized in that the flow restriction of the main water circuit (604) is larger than the flow restriction of the bypass water circuit (605).
3. The gas water heater with the flow limiting device according to claim 2, characterized in that a flow stabilizing valve core (607) is arranged in the bypass waterway (605), and the flow limiting value of the flow stabilizing valve core (607) is larger than the starting water flow of the gas water heater.
4. A gas water heater with a flow-limiting device according to claim 1, characterized in that the pipe diameter of the water mixing pipe (5) is 3 to 5mm, and the pipe diameter of the water inlet pipe (3) is 10 to 16 mm.
5. The gas water heater with the current limiting device according to claim 1, 2, 3 or 4, wherein a water flow detection device (7) is disposed on the water inlet pipe (3), the water flow detection device (7) is located at the front end of the joint of the water mixing pipe (5) and the water inlet pipe (3), a water outlet temperature detection device (8) is disposed on the water outlet pipe (4), the water outlet temperature detection device (8) is located at the rear end of the joint of the water mixing pipe (5) and the water outlet pipe (4), and the controller (1) is electrically connected with the water flow detection device (7) and the water outlet temperature detection device (8) respectively.
6. The gas water heater with the flow limiting device according to claim 1, 2, 3 or 4, further comprising a burner (9), a gas control valve (10) and an operation display (11), wherein the gas control valve (10) is communicated with an air inlet end of the burner (9), and the controller (1) is electrically connected with the gas control valve (10) and the operation display (11) respectively.
7. The gas water heater with the flow limiting device according to claim 6, wherein the controller (1) controls the gas control valve (10) to work so that the outlet water temperature of the gas water heater reaches a preset temperature, and the temperature control time for the controller (1) to control the gas control valve (10) to work is calculated according to the following formula:
t＝(tmax-tmin)×(Tpreset of-TPreset min)/(TPreset max-TPreset min)+tmin；
Wherein, tmaxFor maximum programmed temperature control time, tminFor a minimum programmed temperature control time, TPreset ofPresetting the temperature, T, for the userPreset maxFor the programmed maximum preset temperature, TPreset minThe programmed minimum preset temperature.
8. A control method of a gas water heater with a flow limiting device, applied to the gas water heater according to any one of claims 1 to 7, comprising the steps of:
judging whether the actually measured water flow is larger than the starting-up water flow or not;
if the actually measured water flow is larger than the starting-up water flow, controlling the starting-up ignition of the gas water heater to enter a shower working mode;
the main path electromagnetic valve is controlled to cut off the main water path, and the opening degree of the gas control valve is adjusted to control the outlet water temperature;
after the first program temperature control time is reached, judging whether the outlet water temperature is greater than the preset temperature or not;
if the outlet water temperature is higher than the preset temperature, the main path electromagnetic valve is controlled to conduct the main water path, and the opening degree of the fuel gas control valve is adjusted to control the outlet water temperature.
9. The method of controlling a gas water heater having a flow limiting device of claim 8, further comprising the steps of:
after the temperature control time of the second program is reached, judging whether the temperature of the outlet water is less than the preset temperature or not;
if the water outlet temperature is lower than the preset temperature, controlling a main path electromagnetic valve to cut off a main water path, and adjusting the opening of a gas control valve to control the water outlet temperature;
if the water outlet temperature is higher than the preset temperature, whether the measured water flow is smaller than the shutdown water flow or not is judged, if the measured water flow is larger than the shutdown water flow, the opening degree of the gas control valve is continued to control the water outlet temperature, and if the measured water flow is smaller than the shutdown water flow, the gas water heater is controlled to shut down and shut down to exit the shower working mode, and the main-path electromagnetic valve is controlled to cut off the main water path.
10. The method of claim 8, wherein the step of determining whether the outlet water temperature is greater than the predetermined temperature after the first programmed temperature control time is reached comprises:
if the water outlet temperature is lower than the preset temperature, whether the measured water flow is lower than the shutdown water flow or not is judged, if the measured water flow is higher than the shutdown water flow, the opening of the gas control valve is continued to control the water outlet temperature, if the measured water flow is lower than the shutdown water flow, the gas water heater is controlled to shut down and shut down, the shower operating mode is quitted, and the main-path electromagnetic valve is controlled to cut off the main water path.
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Cited By (1)
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| CN115247898A (en) * | 2022-06-30 | 2022-10-28 | 宁波方太厨具有限公司 | Constant temperature control method for water re-outlet of water heater |
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