CN110848988B - Anti-freezing control method and gas water heater - Google Patents
Anti-freezing control method and gas water heater Download PDFInfo
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- CN110848988B CN110848988B CN201910979676.2A CN201910979676A CN110848988B CN 110848988 B CN110848988 B CN 110848988B CN 201910979676 A CN201910979676 A CN 201910979676A CN 110848988 B CN110848988 B CN 110848988B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 296
- 238000007710 freezing Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 24
- 230000002528 anti-freeze Effects 0.000 claims description 13
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 5
- 108010053481 Antifreeze Proteins Proteins 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 208000001034 Frostbite Diseases 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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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Abstract
The invention discloses an anti-freezing control method, which comprises the following steps: s1: continuously detecting a real-time water flow value Qi of the gas water heater; s2: judging whether the real-time water flow Qi is smaller than a first water flow threshold Qs1, if so, entering step S3, otherwise, entering a standby or normal working mode; s3: detecting the real-time water flow temperature Ti of the gas water heater; s4: and judging whether the real-time water flow temperature Ti is less than or equal to a preset temperature Tw, if so, entering an anti-freezing working mode, and otherwise, entering a standby working mode. According to the anti-freezing control method, the working mode of the gas water heater is preliminarily determined according to the relation between the real-time water flow value and the first water flow threshold, and whether the anti-freezing working mode is timely started or not is determined according to the relation between the real-time water flow temperature and the preset temperature, so that related parts of a water path system cannot be frozen and cracked in a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to an anti-freezing control method and a gas water heater.
Background
At present, gas water heaters sold in the market are mainly classified into two categories: an anti-freezing control method and a conventional gas water heater. The anti-freezing control method mainly comprises the steps that an anti-freezing heater assembly is added on the basis of a conventional machine type, the anti-freezing heater is connected in parallel with a system circuit, when the temperature of detected water flow is lower than about 7 ℃, the anti-freezing heater circuit is started to heat a water path, and when the temperature in the water path reaches about 15 ℃, the circuit is disconnected, so that the anti-freezing purpose is achieved.
A conventional gas water heater is not provided with any anti-freezing heating device, and a water path cannot be heated under the conditions that the ambient temperature is low and a user does not use the gas water heater. When the environmental temperature reaches about 0 ℃, the water in the closed pipeline freezes to generate great expansion force, the pipeline or parts can be burst to cause water leakage of the machine, if the water inlet valve is not closed by a user, the water leakage is caused, the water resource is wasted, and great loss can be caused to the property of the user or others.
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 an anti-freezing control method which is simple and strong in self-adaptive capacity and can effectively solve the problem that a water way or parts of a gas water heater are frozen and cracked in a low-temperature environment.
The invention also provides a gas water heater.
According to the anti-freezing control method provided by the above, the anti-freezing control method is realized by the following technical scheme:
an anti-freezing control method comprises the following steps:
s1: continuously detecting a real-time water flow value Qi of the gas water heater through a water flow detection device;
s2: judging whether the real-time water flow value Qi is smaller than a first water flow threshold value Qs1, if so, entering a step S3, otherwise, entering a standby or normal working mode of the gas water heater;
s3: detecting the real-time water flow temperature Ti of the gas water heater through a temperature detection device;
s4: and judging whether the real-time water flow temperature Ti is less than or equal to a preset temperature Tw, if so, entering an anti-freezing working mode of the gas water heater, and otherwise, entering a standby working mode of the gas water heater.
In the first embodiment, after the gas water heater enters the anti-freezing operation mode in step S4, the method further includes the following steps:
s401: starting a gas water heater to heat the internal water flow and starting timing t;
s402: and continuously judging whether the heating time t reaches the preset time ts, if so, stopping heating and controlling the gas water heater to stop working.
In a second embodiment, after the gas water heater enters the anti-freezing operation mode, the method further comprises the following steps:
s401': starting the gas water heater to heat the internal water flow;
s402': acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
s403': and judging whether the temperature rise value delta Ti is less than or equal to a preset temperature threshold value Ts, if so, stopping heating and controlling the gas water heater to stop working, otherwise, returning to the step S402'.
In a third embodiment, after the gas water heater enters the anti-freezing operation mode, the method further comprises the following steps:
s41: starting a gas water heater to heat the internal water flow and starting timing t;
s42: acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
s43: and continuously judging whether the heating time t reaches the preset time Ts, simultaneously judging whether the temperature rise value delta Ti is less than or equal to the preset temperature threshold Ts, and if t is Ts and delta Ti is less than or equal to Ts, stopping heating and controlling the gas water heater to stop working.
Further, the preset temperature threshold Ts is Δ Ts + ζ, where Δ Ts is a programmed preset temperature rise value, and ζ is a sensitivity range of the temperature detection device.
Further, in step S2, when the real-time water flow Qi is greater than or equal to the first water flow threshold Qs1, the relationship between the real-time water flow Qi and the second water flow threshold Qs2 is further compared, and if Qi is less than Qs2, the gas water heater enters a standby mode; if Qi is more than or equal to Qs2, the gas water heater enters a normal working mode.
Further, the first water flow rate threshold Qs1 is a water flow leakage value of the gas water heater.
Further, the second water flow threshold Qs2 is the minimum starting water flow value for the ignition operation of the gas water heater.
According to the gas heater who provides above-mentioned, it realizes through following technical scheme:
a gas water heater applying the anti-freezing control method comprises a water heater body, a water path system with a water inlet pipe and a water outlet pipe, and a gas control valve, wherein the gas water heater further comprises: the water flow detection device is arranged on the water inlet pipe or the water outlet pipe and is used for detecting the real-time water flow Qi of the water inlet pipe or the water outlet pipe; the temperature detection device is arranged on the water outlet pipe or the water outlet pipe and is used for detecting the real-time water flow temperature Ti of the outlet water or the inlet water; and the control module is used for controlling the water heater to enter an anti-freezing working mode when the real-time water flow value Qi is less than a first water flow threshold value Qs1 and the real-time water flow temperature Ti is less than or equal to a preset temperature Tw.
Compared with the prior art, the invention at least comprises the following beneficial effects: the anti-freezing control method preliminarily determines the working mode of the gas water heater according to the relation between the real-time water flow value and the first water flow threshold value, and then determines whether to enter the anti-freezing working mode in time according to the relation between the real-time water flow temperature and the preset temperature so as to ensure that relevant parts of a water path system cannot be frozen and cracked under a low-temperature environment.
Drawings
FIG. 1 is a flowchart of an antifreeze control method in embodiment 1 of the present invention;
FIG. 2 is a flowchart of a first control method in the antifreeze operation mode according to the embodiment 1 of the present invention;
FIG. 3 is a flowchart of a second control method in the antifreeze operation mode according to the embodiment 2 of the present invention;
FIG. 4 is a flowchart of a third control method in the antifreeze operation mode according to the embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of a gas water heater in embodiment 3 of the present invention.
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.
Example 1
As shown in fig. 1, an anti-freeze control method includes the following steps:
s1: continuously detecting a real-time water flow value Qi of the gas water heater through a water flow detection device;
specifically, the water flow detection device is installed in a waterway system of the gas water heater and electrically connected with a control module of the gas water heater, a real-time water flow value Qi in the waterway system is continuously detected by the water flow detection device, and the control module compares the real-time water flow value Qi detected by the water flow detection device with at least one preset value to determine that the water flow in the waterway system meets the water flow value preset in any one working mode of an anti-freezing, standby or normal working mode of the gas water heater.
S2: judging whether the real-time water flow value Qi is smaller than a first water flow threshold value Qs1, if so, entering a step S3, otherwise, entering a standby or normal working mode of the gas water heater;
specifically, the at least one preset value includes a first water flow threshold Qs1, wherein the first water flow threshold Qs1 is a water flow leakage value of the gas water heater. Based on a real-time water flow value Qi detected by the water flow detection device, the control module compares the relation between Qi and Qs1, and when Qi is less than Qs1, the flow of water stored in the water channel system is low, and ice may be condensed, so that the gas water heater needs to enter an anti-freezing or standby working mode; when Qi is more than or equal to Qs1, the flow quantity of stored water in the water path system is large, and ice cannot be condensed, so that the gas water heater can enter a standby or normal working mode.
In this embodiment, the anti-freezing operation mode specifically refers to an operation mode in which the gas water heater achieves combustion heating, anti-freezing and ignition operation in order to prevent related parts in the waterway system from being frozen and cracked; the normal working mode specifically refers to a working mode in which the gas water heater reaches normal ignition operation in order to meet the hot water use requirement of a user.
S3: detecting the real-time water flow temperature Ti of the gas water heater through a temperature detection device;
specifically, the temperature detection device is arranged in a waterway system of the gas water heater and electrically connected with the control module, and is used for detecting the real-time water flow temperature of the waterway system in real time and feeding back a detected water flow temperature signal to the control module. After Qi is less than Qs1, the real-time water flow temperature Ti in the water path system is detected through the temperature detection device, so that the control module further determines that the gas water heater needs to enter a standby or anti-freezing working mode according to the relation between the real-time water flow temperature Ti and the preset temperature Tw.
S4: and judging whether the real-time water flow temperature Ti is less than or equal to a preset temperature Tw, if so, entering an anti-freezing working mode of the gas water heater, and otherwise, entering a standby working mode of the gas water heater. Preferably, the preset temperature Tw in this embodiment is an icing temperature, and when it is determined that the real-time water flow temperature Ti in the water path system is not greater than the icing temperature, the gas water heater is automatically controlled to enter an anti-freezing working mode, so as to ensure that relevant parts of the water path system are not frozen and cracked, and improve the service performance of the gas water heater.
The anti-freezing control method of the embodiment preliminarily determines the working mode of the gas water heater according to the relation between the real-time water flow value Qi and the first water flow threshold value Qs1, and then determines whether to automatically enter the anti-freezing working mode in time according to the relation between the real-time water flow temperature Ti and the preset temperature Tw, so as to ensure that the waterway system cannot be frozen and cracked under the low-temperature environment.
As shown in fig. 2, further, after the gas water heater enters the anti-freezing operation mode in step S4, the method further includes the following steps:
s401: starting a gas water heater to heat the internal water flow and starting timing t;
specifically, after confirming that gas heater gets into frostproofing mode, the automatic start gas heater heats in order to deposit the water in the waterway system, prevents that the deposit of water in the waterway system from crossing the emergence and freezing because of ambient temperature, and then prevents that waterway system from crossing the emergence frost crack when ambient temperature crosses, effectively protects each part of waterway system. And when the gas water heater is automatically started, the timing module of the gas water heater starts to record the running time t of the gas water heater.
S402: and continuously judging whether the heating time t reaches the preset time ts, if so, stopping heating and controlling the gas water heater to stop working. Specifically, the preset time ts is the preset time length for the gas water heater to perform combustion heating anti-freezing in the anti-freezing working mode. And when the control module judges that the heating time t of the gas water heater reaches the preset time ts, automatically controlling the gas water heater to stop working so as to finish the anti-freezing working mode. Therefore, the existing components of the gas water heater are fully utilized, and whether the anti-freezing working mode is finished or not is determined according to the relation between the heating time t for combustion heating anti-freezing and the preset time ts, so that the phenomenon that water stored in the water channel system is frozen due to the excessively low ambient temperature is avoided by optimizing an anti-freezing control method, the water channel system is prevented from being frozen when the ambient temperature is excessively low, and all the components of the water channel system are protected. In addition, an anti-freezing heater assembly is not required to be additionally arranged, the assembling procedures of the gas water heater are reduced, and the manufacturing cost is reduced.
As shown in fig. 1, further, in step S2, when the real-time water flow rate Qi is greater than or equal to the first water flow rate threshold Qs1, the relationship between the real-time water flow rate Qi and the second water flow rate threshold Qs2 is further compared (step S5), and if Qi < Qs2, the gas water heater enters the standby operation mode (step S7); if Qi is not less than Qs2, the gas water heater enters the normal operation mode (step S6). Therefore, the standby or normal working mode of the gas water heater is further determined according to the relation between the real-time water flow value Qi and the second water flow threshold value Qs2, so that the related parts of the water channel system are prevented from being frozen when the ambient temperature is lower than the preset temperature Tw (namely, the freezing temperature), and the self-adaptive capacity of the gas water heater is improved.
Specifically, the at least one preset value further comprises a second water flow threshold Qs2, wherein the second water flow threshold Qs2 is a minimum starting water flow value for ignition operation of the gas water heater. After determining that Qi is larger than or equal to Qs1, the real-time water flow value Qi detected by the water flow detection device is compared with a second water flow threshold value Qs2, and whether the gas water heater enters a standby operation mode or a normal operation mode is determined based on the comparison result.
It can be seen that, in the anti-freezing control method of this embodiment, the working mode of the gas water heater is preliminarily determined by comparing the relationship between the real-time water flow value Qi in the water path system and the [ the first water flow threshold Qs1, the second water flow threshold Qs2], and then whether the gas water heater enters the anti-freezing working mode is determined according to the relationship between the real-time water flow temperature T in the water path system and the preset temperature Tw, so that the self-adaptive capability of the gas water heater is accurately improved, the anti-freezing work of the gas water heater is ensured to be more stable and reliable, and the problem that relevant parts of the water path system cannot be frozen and cracked in a low-temperature environment is solved.
Example 2
As shown in fig. 3, the present embodiment is different from embodiment 1 in the control method for ending the anti-freeze operation mode. Specifically, after the gas water heater enters the anti-freezing working mode, the method further comprises the following steps:
s401': starting the gas water heater to heat the internal water flow;
s402': acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
specifically, a temperature detection device in the waterway system collects the current water flow temperature Ti in the waterway system at intervals of time delta T, and a control module calculates the difference between the current water flow temperature Ti and the last collected water flow temperature T (i-1) to obtain a temperature rise value delta Ti.
S403': and judging whether the temperature rise value delta Ti is less than or equal to a preset temperature threshold value Ts, if so, stopping heating and controlling the gas water heater to stop working, otherwise, returning to the step S402'.
Specifically, the control module compares the calculated temperature rise value delta Ti with a preset temperature threshold Ts, determines whether to end the anti-freezing working mode or not based on the comparison result, and controls the gas water heater to stop working and end the anti-freezing working mode if the temperature rise value delta Ti is less than or equal to the preset temperature threshold Ts; if the increment value delta Ti is larger than the preset temperature threshold value Ts, the step S402' is returned to continuously collect the next temperature increment value delta T (i +1), and the obtained next temperature increment value delta T (i +1) is continuously compared with the preset temperature threshold value Ts.
Therefore, the anti-freezing control method of the embodiment determines whether to end the anti-freezing working mode according to the relationship between the temperature rise value Δ Ti and the preset temperature threshold value Ts, so that the anti-freezing working mode is accurately and reliably automatically controlled, the combustion heating anti-freezing work of the gas water heater is more stable and reliable, the self-adaptive capacity of the gas water heater is improved, and the use failure rate of each component of the water path system is reduced.
In other embodiments, after the gas water heater enters the anti-freeze operation mode, whether to end the anti-freeze operation mode may also be determined by the following control method. As shown in fig. 4, it further includes the following steps:
s41: starting a gas water heater to heat the internal water flow and starting timing t;
s42: acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
s43: and continuously judging whether the heating time t reaches the preset time Ts, simultaneously judging whether the temperature rise value delta Ti is less than or equal to the preset temperature threshold Ts, and if t is Ts and delta Ti is less than or equal to Ts, stopping heating and controlling the gas water heater to stop working. Therefore, the relationship between the heating time t and the preset time Ts and the relationship between the temperature rise value delta Ti and the preset temperature threshold value Ts are simultaneously used as judgment conditions, and the stability and the reliability of the combustion heating anti-freezing work of the gas water heater are further improved.
Preferably, the preset temperature threshold Ts of the present embodiment is Δ Ts + ζ, where Δ Ts is a program preset temperature rise value, and ζ is a sensitivity range of the temperature detection device.
Example 3
As shown in fig. 5, a gas water heater to which the antifreeze control method according to embodiment 1 or 2 is applied in this embodiment includes a water heater body 1, a water path system having a water inlet pipe 2 and a water outlet pipe 3, and a gas control valve 4, and further includes: the water flow detection device 5 is arranged on the water inlet pipe 2 or the water outlet pipe 3 and is used for detecting the real-time water flow Qi value of the water inlet pipe 2 or the water outlet pipe 3; the control module 6, the water flow detection device 5 and the gas control valve 4 are respectively electrically connected with the control module 6, and are used for acquiring and judging the relationship between the real-time water flow value Qi of the water inlet pipe 2 or the water outlet pipe 3 and the first water flow threshold Qs1, and determining the working mode of the gas water heater based on the judgment result. Preferably, the water flow detecting device 5 of the present embodiment is disposed on the water inlet pipe 2.
Further, still include: and the temperature detection device 7 is arranged on the water outlet pipe 3 or the water outlet pipe 3 and is used for detecting the real-time water flow temperature Ti of the outlet water or the inlet water. The control module 6 is electrically connected with the temperature detection device 7, and is configured to obtain and determine a relationship between the real-time water flow temperature Ti of the water outlet pipe 3 or the water outlet pipe 3 and the preset temperature Tw, and determine that the water heater enters the anti-freezing working mode or the standby working mode based on a determination result. Preferably, the temperature detection device 7 of the present embodiment is disposed on the water outlet pipe 3.
It can be seen that the gas heater of this embodiment, it is under the condition that need not additionally to increase the heater subassembly that prevents frostbite, abundant gas heater's current part has realized preventing that waterway system's relevant part from taking place the frost crack when ambient temperature is low excessively, and self-adaptability is strong, makes gas heater's work more stable, reliable, has reduced the assembly process because of need not to increase the heater subassembly that prevents frostbite simultaneously, does benefit to reduction in manufacturing cost.
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 (9)
1. An anti-freezing control method is characterized by comprising the following steps:
s1: continuously detecting a real-time water flow value Qi of the gas water heater through a water flow detection device;
s2: judging whether the real-time water flow value Qi is smaller than a first water flow threshold value Qs1, if so, entering a step S3, otherwise, entering a standby or normal working mode of the gas water heater;
s3: detecting the real-time water flow temperature Ti of the gas water heater through a temperature detection device;
s4: and judging whether the real-time water flow temperature Ti is less than or equal to a preset temperature Tw, if so, entering an anti-freezing working mode of the gas water heater, and otherwise, entering a standby working mode of the gas water heater.
2. The anti-freezing control method as claimed in claim 1, wherein after entering the anti-freezing operation mode in step S4, the method further comprises the following steps:
s401: starting a gas water heater to heat the internal water flow and starting timing t;
s402: and continuously judging whether the heating time t reaches the preset time ts, if so, stopping heating and controlling the gas water heater to stop working.
3. The anti-freezing control method as claimed in claim 1, wherein after entering the anti-freezing operation mode, the method further comprises the following steps:
s401': starting the gas water heater to heat the internal water flow;
s402': acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
s403': and judging whether the temperature rise value delta Ti is less than or equal to a preset temperature threshold value Ts, if so, stopping heating and controlling the gas water heater to stop working, otherwise, returning to the step S402'.
4. The anti-freezing control method as claimed in claim 1, wherein after entering the anti-freezing operation mode, the method further comprises the following steps:
s41: starting a gas water heater to heat the internal water flow and starting timing t;
s42: acquiring a temperature rise value delta Ti of water flow in the gas water heater at intervals of delta t by using a temperature detection device;
s43: and continuously judging whether the heating time t reaches the preset time Ts, simultaneously judging whether the temperature rise value delta Ti is less than or equal to the preset temperature threshold Ts, and if t is Ts and delta Ti is less than or equal to Ts, stopping heating and controlling the gas water heater to stop working.
5. The antifreeze control method according to claim 3 or 4, wherein the preset temperature threshold value Ts is Δ Ts + ζ, where Δ Ts is a programmed preset temperature rise value and ζ is a sensitivity range of the temperature detection device.
6. The antifreeze control method according to claim 1, wherein in step S2, when said real-time water flow value Qi is greater than or equal to the first water flow threshold Qs1, the relationship between the real-time water flow value Qi and the second water flow threshold Qs2 is further compared, and if Qi < Qs2, the gas water heater enters the standby mode; if Qi is more than or equal to Qs2, the gas water heater enters a normal working mode.
7. The antifreeze control method according to claim 1 or 6, wherein said first water flow threshold Qs1 is a water flow leakage value of a gas water heater.
8. The antifreeze control method of claim 6, wherein said second threshold value Qs2 is a minimum starting water flow value for ignition operation of a gas water heater.
9. A gas water heater applying an anti-freezing control method according to any one of claims 1 to 8, comprising a water heater body (1), a water circuit system having an inlet pipe (2) and an outlet pipe (3), and a gas control valve (4), characterized by further comprising: the water flow detection device (5) is arranged on the water inlet pipe (2) or the water outlet pipe (3) and is used for detecting a real-time water flow value Qi of the water inlet pipe (2) or the water outlet pipe (3);
the temperature detection device (7) is arranged on the water outlet pipe (3) or the water inlet pipe (2) and is used for detecting the real-time water flow temperature Ti of the outlet water or the inlet water;
the control device comprises a control module (6), the temperature detection device (7), the water flow detection device (5) and the gas control valve (4) are respectively electrically connected with the control module (6), and the control module (6) is used for controlling the water heater to enter an anti-freezing working mode when the real-time water flow value Qi is less than a first water flow threshold value Qs1 and the real-time water flow temperature Ti is less than or equal to a preset temperature Tw.
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| CN114440469B (en) * | 2022-02-09 | 2023-03-28 | 宁波方太厨具有限公司 | Anti-freezing control method and system for water heater, gas water heater and medium |
| CN115358432B (en) | 2022-10-14 | 2023-02-07 | 成都秦川物联网科技股份有限公司 | Gas meter metering fault determination method for intelligent gas and Internet of things system |
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| CN202973561U (en) * | 2012-11-05 | 2013-06-05 | 中山华帝燃具股份有限公司 | Gas water heater with antifreezing function |
| CN203274049U (en) * | 2013-06-04 | 2013-11-06 | 樱花卫厨（中国）股份有限公司 | Anti-freezing control device of heating system for gas heating/hot water dual-purpose stove |
| EP2853838A1 (en) * | 2013-09-26 | 2015-04-01 | Panasonic Corporation | Hot water generator |
| CN105757997A (en) * | 2016-03-17 | 2016-07-13 | 安庆市鸿裕工业产品设计有限公司 | Anti-freezing fuel gas and water amount detecting device for heating oven |
| CN106322769A (en) * | 2016-08-30 | 2017-01-11 | 宁波方太厨具有限公司 | Water circulation control method of gas water heater, and gas water heater adopting water circulation control method |
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