CN112577197A - Gas water heater and control method thereof - Google Patents
Gas water heater and control method thereof Download PDFInfo
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- CN112577197A CN112577197A CN201910944289.5A CN201910944289A CN112577197A CN 112577197 A CN112577197 A CN 112577197A CN 201910944289 A CN201910944289 A CN 201910944289A CN 112577197 A CN112577197 A CN 112577197A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 217
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 14
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 73
- 239000002918 waste heat Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000003440 toxic substance Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Classifications
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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
-
- 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
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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)
Abstract
The invention discloses a gas water heater and a control method thereof. This gas heater includes: the heat exchanger is internally provided with a heat exchanging part, a heat exchanger temperature sensor is installed on the heat exchanger, the heat exchanger is connected with a water inlet pipe and a water outlet pipe, a water inlet temperature sensor is installed on the water inlet pipe, and a water outlet temperature sensor is installed on the water outlet pipe; a catalytic burner, the heat exchanger being located above the catalytic burner; a preheating burner disposed opposite the catalytic burner, the preheating burner for heating the catalytic burner. According to the gas water heater, when the gas water heater stops working, the waste heat of the catalytic combustor is utilized to preheat the heat exchanger, so that the outlet water temperature can be quickly adjusted to be consistent with the preset temperature when the gas water heater is reused. In the process, the heat exchanger makes full use of the waste heat of the catalytic combustor, and is beneficial to making full use of energy.
Description
Technical Field
The invention relates to the field of water heaters, in particular to a gas water heater and a control method thereof.
Background
A gas water heater is an apparatus for heating cold water by burning gas. The main combustion mode adopted by some gas water heaters is flame combustion, and the combustion completeness and temperature are different due to the contact difference between different combustion parts and air in the flame combustion mode. Nitrogen oxide pollutants are easily generated in the high-temperature area; the low temperature zone is easy to generate harmful substances such as carbon monoxide, hydrocarbon, tar and the like. And the other part of the gas water heaters adopt flameless combustion of a catalytic combustor to realize heating, the catalytic combustion is a complete oxidation reaction of fuel on the surface of a catalyst, the occurrence of side reactions of generating toxic and harmful substances is effectively inhibited through the selectivity of the catalyst, and pollutants such as NOx, CO, HC and the like are basically not generated or are rarely generated.
However, when the existing gas water heater is used, the outlet water temperature is often inconsistent with the preset temperature, so that the user experience is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides the gas water heater which can reduce the emission of toxic substances and is beneficial to ensuring that the outlet water temperature is consistent with the preset temperature.
The invention also provides a control method of the gas water heater, which can make the outlet water temperature consistent with the preset temperature.
A gas water heater according to an embodiment of the present invention includes: the heat exchanger is internally provided with a heat exchanging part, a heat exchanger temperature sensor is installed on the heat exchanger, the heat exchanger is connected with a water inlet pipe and a water outlet pipe, a water inlet temperature sensor is installed on the water inlet pipe, and a water outlet temperature sensor is installed on the water outlet pipe; a catalytic burner, the heat exchanger being located above the catalytic burner; a preheating burner disposed opposite the catalytic burner, the preheating burner for heating the catalytic burner.
According to the gas water heater provided by the embodiment of the invention, the emission of toxic substances can be reduced by arranging the catalytic combustor, and the heat exchanger is provided with the heat exchanger temperature sensor, the water inlet pipe is provided with the water inlet temperature sensor, and the water outlet pipe is provided with the water outlet temperature sensor, so that the consistency of the water outlet temperature and the preset temperature can be favorably ensured.
According to some embodiments of the invention, the inlet pipe is fitted with an inlet flow regulating sensor for regulating the flow of water into the heat exchanger and for measuring the flow of water into the heat exchanger.
Further, the gas water heater further includes: and the bypass pipe is connected between the water inlet end of the water inlet flow regulating sensor and the water outlet pipe.
Optionally, a bypass water flow adjustment sensor is mounted on the bypass pipe for adjusting the water flow into the bypass pipe and measuring the water flow into the bypass pipe.
According to some embodiments of the invention, a check valve is mounted on the bypass pipe, and the check valve ensures that water in the bypass pipe only flows from the water inlet pipe to the water outlet pipe.
According to another aspect of the invention, the control method of the gas water heater comprises the following steps:
step 2, judging the preset water quantity Q of the heat exchanger and the water flow measurement value Qa of the inflow water flow regulating sensor, if Q is larger than Qa, entering step 3, otherwise entering step 5;
step 5, judging whether the ignition control is normal or not, if so, entering a step 6, and if not, entering a step 9;
step 6, judging whether the preheating control is normal or not, if so, entering a step 7, and if not, entering a step 9;
step 7, judging whether the catalytic combustion control is normal or not, if so, entering a step 8, and if not, entering a step 9;
step 8, stopping or extinguishing detection, if yes, entering step 9, and if not, entering step 7;
and 9, closing the gas water heater.
Optionally, in the step 3, the ratio Qb/Qa is controlled according to t, the measured values t1 and t2 of the inlet water temperature sensor, wherein Qb/Qa is (t2-t)/(t-t 1).
Optionally, in the step 5, a signal provided by a flame detector is used to determine whether the ignition control at the preheating burner is normal.
Optionally, in the step 6, a signal provided by a thermocouple is used to determine whether the preheating control of the catalytic combustor by the preheating combustor is normal.
Optionally, in the step 7, a signal provided by a thermocouple is used to determine whether the catalytic combustion control of the catalytic combustor is normal.
According to the control method of the gas water heater in another aspect of the invention, when the gas water heater stops working, the heat exchanger can be preheated by using the waste heat of the catalytic combustor, so that the outlet water temperature can be quickly adjusted to be consistent with the preset temperature when the gas water heater is reused. In the process, the heat exchanger makes full use of the waste heat of the catalytic combustor, and is beneficial to making full use of energy.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a gas water heater;
fig. 2 is a flow chart of a control method of the gas water heater.
Reference numerals:
the system comprises a gas water heater 10, a heat exchanger 1, a heat exchanger temperature sensor 11, a catalytic combustor 2, a preheating combustor 3, a water inlet pipe 4, a water inlet temperature sensor 41, a water inlet flow adjusting sensor 42, a water outlet pipe 5, a water outlet temperature sensor 51, a bypass pipe 6, a bypass water flow adjusting sensor 61, a check valve 62, a premixing cavity 71, a fan 72, a gas valve 73, a controller 74, a smoke collecting hood 75 and a gas connecting pipe 76.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
A gas water heater 10 according to an embodiment of the present invention is described in detail below with reference to fig. 1-2.
Referring to fig. 1, a gas water heater 10 according to an embodiment of the present invention may include: a heat exchanger 1, a catalytic burner 2, a preheating burner 3 and a premixing chamber 71.
The preheating burner 3 is arranged opposite the catalytic burner 2, for example in the example of fig. 1, the preheating burner 3 being located below the catalytic burner 2, the preheating burner 3 being used for heating the catalytic burner 2. In some embodiments, not shown, the preheating burner 3 may be located above or to the side of the catalytic burner 2, provided that the catalytic burner 2 is located on the downstream side of the preheating burner 3 in the flow direction of the gas stream.
For convenience of description, the preheating burner 3 is illustrated below the catalytic burner 2, but should not be construed as limiting the relative position of the preheating burner 3 and the catalytic burner 2. When the gas water heater 10 works, the heat radiated by the preheating burner 3 upwards reaches the catalytic burner 2 to heat the catalytic burner 2, so that the temperature of the catalytic burner 2 is increased to a proper working temperature range, the catalytic burner 2 can play the best catalytic combustion role in the working temperature range, and when air and gas mixed gas is combusted in the catalytic burner 2, the combustion is sufficient, so that the amount of harmful gas such as CO, NOx and the like generated due to insufficient combustion is greatly reduced.
The preheating burner 3 may be an open flame burner, and a spacing is set between the preheating burner 3 and the catalytic burner 2, which spacing may avoid a flashback phenomenon of the preheating burner 3, i.e. the spacing serves to prevent a flame of the open flame from flashback.
The heat exchanger 1 is internally provided with a heat exchange part, the heat exchange part is internally provided with a heat exchange medium channel, the heat exchanger 1 is connected with a water inlet pipe 4 and a water outlet pipe 5, cold water enters the heat exchanger 1 through the water inlet pipe 4, water flows in the heat exchange medium channel and becomes hot water after being heated by the catalytic combustor 2, and then the hot water is discharged from the water outlet pipe 5 to be used by a user. In the embodiment of fig. 1, the heat exchanger 1 is located above the catalytic burner 2, which ensures that more heat from the catalytic burner 2 is transferred to the heat exchanger 1.
The heat exchanger 1 can be made of stainless steel or copper, and has good heat exchange effect and strong corrosion resistance.
The premixing chamber 71 is installed below the preheating burner 3, and the premixing chamber 71 is used for mixing air and fuel gas to realize premixing of the air and the fuel gas. Referring to fig. 1, the preheating burner 3 is disposed on the gas outlet side of the premixing chamber 71 so that the air-gas mixture discharged from the gas outlet side is burned at the preheating burner 3. The premixing cavity 71 can improve the mixing uniformity of air and gas, so as to improve the combustibility of the air-gas mixture, and the air-gas mixture can be fully combusted in the combustion stage.
The fan 72 is connected with an air inlet of the premixing cavity 71, the fan 72 blows air into the cavity of the premixing cavity 71 from the air inlet, the gas connecting pipe 76 is connected with a gas inlet of the premixing cavity 71 to blow gas into the cavity of the premixing cavity 71 from the gas inlet, the gas connecting pipe 76 is provided with a gas valve 73, and the gas quantity can be adjusted by adjusting the valve size of the gas valve 73.
The top of the gas water heater 10 is provided with a smoke collecting hood 75, the tail gas of the catalytic burner 2 and the preheating burner 3 is exhausted to the outside of the gas water heater 10 through the smoke collecting hood 75, and a plurality of electrical components of the gas water heater 10 are connected with the controller 74, so as to ensure that the temperature of the water flowing out of the water outlet pipe 5 meets the requirements of users.
As shown in fig. 1, a heat exchanger temperature sensor 11 is installed on the heat exchanger 1, an inlet water temperature sensor 41 is installed on the inlet pipe 4, an outlet water temperature sensor 51 is installed on the outlet pipe 5, and the heat exchanger temperature sensor 11, the inlet water temperature sensor 41 and the outlet water temperature sensor 51 are all connected with a controller 74. For convenience of description, in the present invention, it is specified that the preset temperature of the gas water heater 10 is t, i.e. the temperature that the user wants the gas water heater 10 to reach, the measured value of the inlet water temperature sensor 41 is t1, the measured value of the heat exchanger temperature sensor 11 is t2, and the measured value of the outlet water temperature sensor 51 is t3, i.e. the actual outlet water temperature of the gas water heater 10 is t 3.
If the outlet water temperature t3 is different from the preset temperature t, the controller 74 adjusts the water inlet amount of the water inlet pipe 4 of the gas water heater 10 to gradually reduce the difference between the outlet water temperature t3 and the preset temperature t until t3 is equal to t, so as to meet the user demand.
According to the gas water heater 10 provided by the embodiment of the invention, the catalytic combustor 2 is arranged, so that sufficient combustion can be ensured, and the emission of toxic substances is reduced, and the heat exchanger 1 is provided with the heat exchanger temperature sensor 11, the water inlet pipe 4 is provided with the water inlet temperature sensor 41, and the water outlet pipe 5 is provided with the water outlet temperature sensor 51, so that the adjustment of the water outlet temperature t3 is facilitated, and the water outlet temperature t3 is ensured to be consistent with the preset temperature t.
Referring to fig. 1, the water inlet pipe 4 is provided with an inlet water flow rate adjusting sensor 42, and the inlet water flow rate adjusting sensor 42 is used for adjusting the water flow rate entering the heat exchanger 1 and measuring the water flow rate entering the heat exchanger 1. The measured value of the water flow rate of the feed water flow rate regulation sensor 42 is Qa.
Further, the gas water heater 10 may further include: and the bypass pipe 6 is connected between the water inlet end of the water inlet flow regulating sensor 42 and the water outlet pipe 5, and the bypass pipe 6 is connected between the water inlet end of the water inlet flow regulating sensor 42 and the water outlet pipe 5. The bypass pipe 6 can lead a part of cold water to the water outlet pipe 5, and prevent the water flowing out of the water outlet pipe 5 from being too high in temperature.
Optionally, a bypass water flow rate adjustment sensor 61 is mounted on the bypass pipe 6, and the bypass water flow rate adjustment sensor 61 is used for adjusting the water flow rate entering the bypass pipe 6 and measuring the water flow rate entering the bypass pipe 6. The measured value of the water flow rate by-pass water flow rate adjustment sensor 61 is Qb.
The cold water quantity accessible of inlet tube 4 is intake flow control sensor 42 and is realized independent control, and the cold water quantity accessible bypass flow control sensor 61 of bypass pipe 6 is realized independent control, and the cold water quantity in inlet tube 4 and the bypass pipe 6 does not influence each other promptly, is favorable to accurate control temperature.
The bypass pipe 6 is provided with the one-way valve 62, and the one-way valve 62 ensures that water in the bypass pipe 6 flows only from the water inlet pipe 4 to the water outlet pipe 5, so that the hot water is prevented from flowing back to the water inlet pipe 4 from the water outlet pipe 5 through the bypass pipe 6 to cause energy waste.
Referring to fig. 2, a control method of a gas water heater 10 according to another embodiment of the present invention includes the following steps:
step S1, reading the set temperature t of the gas water heater 10 and the measured value t2 of the heat exchanger temperature sensor 11, judging the values of t and t2, if t is less than or equal to t2, entering step S2, otherwise, entering step S5;
step S2, judging the preset water quantity Q of the heat exchanger 1 and the water flow measurement value Qa of the inlet water flow regulating sensor 42, if Q is more than Qa, entering step S3, otherwise entering step S5;
step S3, controlling the water flow measurement value Qa of the inlet water flow regulating sensor 42 and the water flow measurement value Qb of the bypass water flow regulating sensor 61 according to t and the measurement values t1 and t2 of the inlet water temperature sensor 41, and entering step S4;
step S4, determining whether t3 is equal to t, if yes, re-entering step S2, and if no, re-entering step S3;
step S5, judging whether the ignition control is normal or not, if so, entering step S6, and if not, entering step S9;
step S6, judging whether the preheating control is normal or not, if so, entering step S7, and if not, entering step S9;
step S7, judging whether the catalytic combustion control is normal or not, if so, entering step S8, and if not, entering step S9;
step S8, stopping or extinguishing detection, if yes, entering step S9, if no, entering step S7;
and step S9, closing the program of the gas water heater 10.
Alternatively, in step S3, the ratio of Qb/Qa is controlled according to t, t1, t2, Qb/Qa being (t2-t)/(t-t 1).
Alternatively, in step S5, the signal provided by the flame detector is used to determine whether the ignition control of the preheating burner 3 is normal. Specifically, in some embodiments, the flame detector detects whether there is a flame at the preheating burner 3, and if the flame detector detects a flame at the preheating burner 3, it indicates that the ignition control is normal. In other embodiments, the flame detector detects whether there is a flame at the preheating burner 3 and detects whether the flicker frequency of the flame satisfies a prescribed value. If the flame detector detects that there is a flame at the preheating burner 3 and the flicker frequency of the flame satisfies a predetermined value, it indicates that the ignition control is normal.
Alternatively, in step S6, the signal provided by the thermocouple is used to determine whether the warm-up control of the catalytic combustor 2 by the preheating combustor 3 is normal. When the temperature detected by the thermocouple continues to rise, it indicates that the preheating burner 3 is preheating the catalytic burner 2, and that the preheating control is normal.
Alternatively, in step S7, it is judged whether the catalytic combustion control of the catalytic combustor 2 is normal using a signal provided by the thermocouple. The catalytic combustion temperature of the catalytic combustor 2 is 600-1200 ℃, and when the temperature detected by the thermocouple is in the temperature range of 600-1200 ℃, the catalytic combustion control is normal.
In step S8, it is detected whether the gas water heater 10 is stopped or turned off, and the stop detection is performed by using the water flow measurement signal provided by the inlet water flow adjustment sensor, and when the water flow measurement value Qa of the inlet water flow adjustment sensor 42 is zero (i.e., the water valve is closed), it indicates that the stop is performed. The signal provided by the thermocouple is used for flameout detection, and when the temperature detected by the thermocouple is always lower than a certain temperature value (for example 100 ℃), flameout is indicated.
When the gas water heater 10 is turned off and gas supply is stopped, the catalytic burner 2 reduces the heat released by the room temperature to be Q-cm delta t, and the heat can be utilized by the heat exchanger 1, so that the heat exchanger 1 is heated, and energy waste is avoided.
When the gas water heater 10 is used again, if the temperature t2 of the heat exchanger 1 is higher than or equal to the preset temperature t, i.e. t is less than or equal to t2, the preset water quantity Q and the water flow measurement value Qa of the inlet water flow regulating sensor 42 are detected, if Q > Qa, the inlet water is insufficient, at this time, the water flow of Qa and Qb needs to be regulated to neutralize the water temperature of the heat exchanger 1, and finally the outlet water temperature t3 is equal to the preset temperature t, i.e. t3 equals t. If Q is less than or equal to Qa, the water inlet is sufficient, the temperature t2 of the heat exchanger 1 is quickly lower than the preset temperature t, and then the normal catalytic combustion process needs to be performed, namely the step S5-the step S9 are performed, so that the temperature t2 is prevented from being reduced due to the water inlet in the heat exchanger 1.
When the gas water heater 10 is used again, if the temperature t2 of the heat exchanger 1 is lower than the preset temperature t, namely t > t2, a normal catalytic combustion procedure needs to be entered, so that the catalytic combustor 2 performs flameless combustion, heat is transferred to the heat exchanger 1 again, and the temperature t2 of the heat exchanger 1 is increased.
That is, the control strategy of the gas water heater 10 is: when the set temperature t is less than or equal to the heat exchanger temperature t2 and Q is more than Qa, adjusting Qa and Qb to enable the outlet water temperature t3 to be t; when the set temperature t is less than or equal to the heat exchanger temperature t2 and Q is less than or equal to Qa, or when the set temperature t is greater than the heat exchanger temperature t2, the catalytic burner 2 is used for catalytically heating the heat exchanger 1 to raise the water temperature in the heat exchanger 1, and finally the outlet water temperature t3 is equal to the preset temperature t, namely t3 is equal to t.
Referring to fig. 2, step S1 is preceded by step S01: a pre-treatment process for the gas water heater 10, which may include a user setting a preset temperature for the gas water heater 10.
According to the control method of the gas water heater 10 of the embodiment of the invention, when the gas water heater 10 stops working, the heat exchanger 1 can be preheated by using the residual heat of the catalytic burner 2, so that the outlet water temperature t3 can be quickly adjusted to be consistent with the preset temperature t when the gas water heater 10 is used again. In the process, the heat exchanger 1 makes full use of the waste heat of the catalytic combustor 2, which is beneficial to the full utilization of energy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A gas water heater, comprising:
the heat exchanger is internally provided with a heat exchanging part, a heat exchanger temperature sensor is installed on the heat exchanger, the heat exchanger is connected with a water inlet pipe and a water outlet pipe, a water inlet temperature sensor is installed on the water inlet pipe, and a water outlet temperature sensor is installed on the water outlet pipe;
a catalytic burner, the heat exchanger being located above the catalytic burner;
a preheating burner disposed opposite the catalytic burner, the preheating burner for heating the catalytic burner.
2. The gas water heater of claim 1, wherein the inlet pipe has an inlet flow regulating sensor mounted thereon for regulating the flow of water into the heat exchanger and measuring the flow of water into the heat exchanger.
3. The gas water heater of claim 2, further comprising: and the bypass pipe is connected between the water inlet end of the water inlet flow regulating sensor and the water outlet pipe.
4. The gas fired water heater of claim 3, wherein a bypass water flow adjustment sensor is mounted on the bypass pipe for adjusting the flow of water into the bypass pipe and measuring the flow of water into the bypass pipe.
5. The gas water heater of claim 4, wherein a one-way valve is mounted on said bypass pipe, said one-way valve ensuring that water in said bypass pipe flows only from said inlet pipe to said outlet pipe.
6. A control method of a gas water heater, characterized in that the gas water heater is the gas water heater of claim 4 or 5, and the steps of the control method are as follows:
step 1, reading a set temperature t of the gas water heater and a measured value t2 of the heat exchanger temperature sensor, judging the values of t and t2, entering step 2 if t is less than or equal to t2, and otherwise entering step 5;
step 2, judging the preset water quantity Q of the heat exchanger and the water flow measurement value Qa of the inflow water flow regulating sensor, if Q is larger than Qa, entering step 3, otherwise entering step 5;
step 3, controlling a water flow measurement value Qa of the inlet water flow regulating sensor and a water flow measurement value Qb of the bypass water flow regulating sensor according to t and measurement values t1 and t2 of the inlet water temperature sensor, and entering step 4;
step 4, judging whether t3 is equal to t, if yes, re-entering the step 2, and if not, re-entering the step 3;
step 5, judging whether the ignition control is normal or not, if so, entering a step 6, and if not, entering a step 9;
step 6, judging whether the preheating control is normal or not, if so, entering a step 7, and if not, entering a step 9;
step 7, judging whether the catalytic combustion control is normal or not, if so, entering a step 8, and if not, entering a step 9;
step 8, stopping or extinguishing detection, if yes, entering step 9, and if not, entering step 7;
and 9, closing the gas water heater.
7. The control method according to claim 6, wherein in the step 3, the ratio of Qb/Qa is controlled according to t, t1, t2, Qb/Qa being (t2-t)/(t-t 1).
8. The control method according to claim 6, wherein in the step 5, a signal provided by a flame detector is used to determine whether ignition control at the preheat burner is normal.
9. The control method according to claim 6, characterized in that in the step 6, a signal provided by a thermocouple is used to judge whether the preheating control of the catalytic burner by the preheating burner is normal.
10. The control method according to claim 6, wherein in the step 7, whether the catalytic combustion control of the catalytic combustor is normal is judged using a signal provided from a thermocouple.
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| CN201910944289.5A CN112577197A (en) | 2019-09-30 | 2019-09-30 | Gas water heater and control method thereof |
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| CN201910944289.5A CN112577197A (en) | 2019-09-30 | 2019-09-30 | Gas water heater and control method thereof |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08247549A (en) * | 1995-03-14 | 1996-09-27 | Takagi Ind Co Ltd | Hot water supply device and control method |
| JPH1089770A (en) * | 1996-09-19 | 1998-04-10 | Osaka Gas Co Ltd | Gas hot-water supplier |
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