CN110131898A - Water heater and freeze-proof heating device thereof - Google Patents
Water heater and freeze-proof heating device thereof Download PDFInfo
- Publication number
- CN110131898A CN110131898A CN201910276855.XA CN201910276855A CN110131898A CN 110131898 A CN110131898 A CN 110131898A CN 201910276855 A CN201910276855 A CN 201910276855A CN 110131898 A CN110131898 A CN 110131898A
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- calandria
- water heater
- temperature
- temperature controller
- region
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000010438 heat treatment Methods 0.000 title claims abstract description 65
- 230000002528 anti-freeze Effects 0.000 claims description 35
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000007710 freezing Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000008014 freezing Effects 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention discloses an anti-freezing heating device of a water heater, which comprises: a power supply module; the heating bodies are mutually connected in parallel and then electrically connected with the power supply module; the branch circuits where the heating bodies are located are respectively connected with a temperature controller in series, and the temperature controllers respectively detect the temperature of the areas where the corresponding heating bodies are located so as to control the connection or disconnection of the corresponding branch circuits, thereby enabling the corresponding heating bodies to start or stop working. The invention also discloses a water heater, and the anti-freezing heating device of the water heater is arranged in the water heater. Through establishing ties every heating member and an solitary temperature controller mutually, the operating condition that the temperature controller can control corresponding the heating member according to the temperature that corresponds the heating member place region, and freeze-proof heating device can only heat water heater inside in the region of needs heating, realizes accurate heating, has reduced the waste of the energy.
Description
Technical field
The invention belongs to technical field of water heaters, specifically, being related to a kind of antifreeze heating device of water heater, further relate to
A kind of water heater equipped with the antifreeze heating device.
Background technique
Gas heater or burnt gas wall hanging furnace are most of all using antifreeze heating device at present, for preventing because temperature is too low
Product is caused freezing, antifreeze heating device mainly based on the antifreeze adding thermal resistance of cement, is aided with single temperature controller to control
The conducting or shutdown of calandria, when temperature controller detects that temperature controller will control antifreeze add when needing antifreeze heating in complete machine
Thermal resistance electrified regulation.But since gas heater or fuel wall hanging furnace volume are larger, the installation site of antifreeze adding thermal resistance with
It is larger that the installation site temperature of temperature controller is possible to gap, and when temperature controller closure, entire antifreeze adding thermal resistance is all in heating
State, for the place for not needing heating, the work of antifreeze adding thermal resistance has resulted in biggish energy waste.
In view of this present invention is specifically proposed.
Summary of the invention
The technical problem to be solved in the present invention is that overcoming the deficiencies of the prior art and provide a kind of antifreeze heating dress of water heater
It sets, to realize the purpose of pinpoint heating.
In order to solve the above technical problems, the present invention is using the basic conception of technical solution:
A kind of antifreeze heating device of water heater, comprising:
Power supply module；
Multiple calandrias are electrically connected after parallel with one another, with power supply module；
One temperature controller of series connection, each temperature controller detect corresponding calandria location respectively respectively for branch road where each calandria
The temperature in domain, to control the connection or disconnection of corresponding branch, so that corresponding calandria starts or stops work.
Further, calandria is arranged at the different location in water heater, and each temperature controller detects where corresponding calandria
When the temperature in region is lower than the first setting value, temperature controller controls corresponding branch connection, and corresponding calandria is started to work, to location
It is heated in domain.
Further, when each temperature controller detects that the temperature of corresponding calandria region is higher than the second setting value, temperature controller
It controls corresponding branch to disconnect, corresponding calandria stops working, stops heating to region.
Further, each temperature controller is close to corresponding calandria setting, with the accurate temperature for detecting corresponding calandria periphery.
Further, calandria and corresponding temperature controller are arranged at water inlet, water outlet and the water heater of water heater
Inside.
Further, the heating power of calandria can be different according to different setting positions, at water heater entery and delivery port
The heating power of calandria is greater than the heating power of the calandria inside water heater.
Further, when any temperature controller detects the temperature of corresponding calandria region lower than the first setting value
When, temperature controller control water heater sounds an alarm, until the temperature of corresponding calandria region is not less than the first setting value.
Further, when any temperature controller detects that the temperature of corresponding calandria region is higher than the second setting value
When, temperature controller control water heater sounds an alarm, until the temperature of corresponding calandria region is not higher than the second setting value.
Another object of the present invention is to provide a kind of water heater, which is provided with a kind of as above any heat
The antifreeze heating device of hydrophone.
Further, which is equipped with display device, when any temperature controller detects corresponding calandria location
The temperature in domain lower than the first setting value and/or or when being higher than the second setting value, which issues alarm signal, and display device connects
Receive the alarm signal, and the region that displays temperature is abnormal.
After adopting the above technical scheme, the present invention has the advantages that compared with prior art.
1, by the way that each calandria and an individual temperature controller are connected in series, temperature controller can be according to where corresponding calandria
The temperature in region controls the working condition of corresponding calandria, antifreeze heating device can only need heating region in water heater
Portion is heated, and is realized precisely heating, is reduced the waste of the energy.
2, temperature controller can real-time detection correspond to the regional temperature where calandria, determine the temperature of corresponding calandria region
Whether whether lower than the first setting value and higher than the second setting value, the temperature in corresponding calandria region is set degree lower than first
When definite value, corresponding branch connection is controlled, to enable calandria to heat region, avoids region because temperature is too low
And lead to bursting by freezing；Meanwhile temperature controller can also be when the temperature of corresponding calandria region be higher than the second setting value, control pair
It answers branch to disconnect, to enable calandria stop heating to region, avoids region temperature excessively high, the energy is caused to damage
Consumption.
3, since the volume of gas heater or burnt gas wall hanging furnace complete machine is generally large, intake-outlet and it is exposed outside
Surface location, under same environmental conditions, temperature reduces very fast；And whole interior is that enclosure space and each machine use
Afterwards, waste heat distributes relatively slow, and temperature reduction is slower, therefore it is larger to produce the complete machine different location temperature difference.An and independent temperature controller
The state that complete machine all areas cannot be monitored completely needs heating temperature when the temperature of temperature controller detection general machine area is reduced to
When, the temperature in other regions is probably also very high, does not need when the antifreeze heating body running of temperature controller control series connection will result in
The antifreeze calandria in region also works at the same time, and causes unnecessary energy waste.
4, by making temperature controller control water heater hair after the temperature for detecting corresponding calandria region is abnormal
Alarm out can prompt in time user corresponding region to be abnormal, and temperature controller can normally be controlled later in the temperature of region
Heat water producer stopping sounds an alarm, and user can understand the working condition of calandria in time, and finds the exception of calandria in time, together
When can accurately confirm the position of the calandria being abnormal, facilitate maintenance personal to repair it.
A specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing is as a part of the invention, and for providing further understanding of the invention, of the invention is schematic
Examples and descriptions thereof are used to explain the present invention, but does not constitute an undue limitation on the present invention.Obviously, the accompanying drawings in the following description
Only some embodiments to those skilled in the art without creative efforts, can be with
Other accompanying drawings can also be obtained according to these attached drawings.In the accompanying drawings:
Fig. 1 is the operation principle schematic diagram of the antifreeze heating device of water heater in the embodiment of the present invention.
In figure: 1, power supply module；2, calandria；3, temperature controller；4- water heater.
It should be noted that these attached drawings and verbal description are not intended to the design model limiting the invention in any way
It encloses, but illustrates idea of the invention by referring to specific embodiments for those skilled in the art.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in embodiment is clearly and completely described, the following examples are intended to illustrate the invention, but
It is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment one
As shown in Figure 1, describing a kind of antifreeze heating device of water heater in the present embodiment, which exists
In water heater 4, water heater 4 can be internally heated when water heater internal temperature is reduced to certain value, to prevent in the winter
Its especially northern winter causes water heater that cannot use because ponding freezes and bursting by freezing inside water heater.
In the present embodiment, the antifreeze heating device of the water heater includes power supply module and multiple calandrias.Multiple 2 phases of calandria
Be electrically connected after mutually in parallel with power supply module 1, since each calandria 2 is parallel with one another, each calandria 2 can work independently, it is mutual not
It influences.One temperature controller 3 of series connection, each temperature controller 3 can detect corresponding 2 institute of calandria respectively respectively for each 2 place branch road of calandria
Temperature in region, to control the connection or disconnection of corresponding branch, so that corresponding calandria 2 starts or stops work.It is logical
Cross and each calandria and an individual temperature controller be connected in series, temperature controller can according to the temperature of corresponding calandria region come
The working condition of corresponding calandria is controlled, antifreeze heating device only can need heating region to be internally heated water heater,
Reduce the waste of the energy.
In the present embodiment, calandria 2 is arranged at the different location inside water heater, to the different positions inside water heater
It sets and is respectively heated, be used to detect the temperature of corresponding 2 region of calandria with the temperature controller 3 that each calandria 2 is connected in series, when
When temperature controller 3 detects the temperature of corresponding 2 region of calandria lower than the first setting value, temperature controller 3 controls corresponding branch and connects
Logical, corresponding calandria 2 is electrically connected with power supply module 1, and corresponding calandria 2 is started to work, heated to region.
In the present embodiment, in switch internal physical deformation can occur for temperature controller 3 according to the temperature change of working environment, from
Certain special effects are not generated, generate the movement that is turned on or off.Kick type temperature controller can be used in temperature controller 3, liquid rises formula temperature controller,
Compression-type temperature controller.Such as: the liquid formula temperature controller that rises is the object made in temperature controller temperature-sensitive portion when the temperature change of control target
Matter (usually liquid) generates the physical phenomenon (volume change) expanded with heat and contract with cold accordingly, and the production of bellows together is connected to temperature-sensitive portion
Raw expansion or shrinkage.With lever principle, switch on and off movement is driven.
In the present embodiment, calandria can be adding thermal resistance.
In the present embodiment, when each temperature controller 3 detects that the temperature of corresponding 2 region of calandria is higher than the second setting value,
Temperature controller 3 controls corresponding branch and disconnects, and corresponding calandria 2 is disconnected with power supply module 1, and corresponding calandria 2 stops working, is right
Region stops heating.Second setting value is higher than the first setting value.
In the present embodiment, temperature controller 3 can real-time detection correspond to the regional temperature where calandria 2, determine corresponding calandria 2
Whether the temperature of region is lower than the first setting value and whether is higher than the second setting value, in corresponding 2 region of calandria
When temperature is lower than the first setting value, corresponding branch connection is controlled, to enable calandria 2 to heat region, where avoiding
Region leads to bursting by freezing because temperature is too low；Meanwhile temperature controller 3 can also be higher than in the temperature of corresponding 2 region of calandria
When the second setting value, controls corresponding branch and disconnect, to enable calandria 2 stop heating to region, avoid region
Temperature is excessively high, causes energy loss.
In the present embodiment, each temperature controller 3 is arranged close to corresponding calandria 2, with the accurate temperature for detecting corresponding 2 periphery of calandria
Degree, avoids since distance is excessive between temperature controller and calandria, temperature detected by temperature controller and practical calandria periphery
Temperature there are certain temperature difference, cause calandria region cannot be heated in time and/or or calandria to place
Region is excessively heated, so as to cause energy loss or even equipment damage is caused.
In the present embodiment, calandria 2 is arranged at the interior of the water inlet of water heater 4, water outlet and water heater 4
At least water heater 4 is arranged in close to corresponding calandria 2 in portion, the exposed position in outer surface of water heater 4, accordingly, temperature controller 3
Water inlet, the inside of water outlet and water heater 4, the exposed position in outer surface of water heater 4.This is because gas heater
Or the volume of burnt gas wall hanging furnace complete machine is generally large, intake-outlet and exposed in outer surface position, in same environmental conditions
Under, temperature reduces very fast；And after whole interior is enclosure space and each machine use, waste heat distributes relatively slow, and temperature reduces
It is relatively slow, therefore it is larger to produce the complete machine different location temperature difference.And an independent temperature controller cannot monitor all areas of complete machine completely
The state in domain, when the temperature of temperature controller detection general machine area, which is reduced to, needs heating temperature, the temperature in other regions has very much can
Can be also very high, the antifreeze calandria in region yet work simultaneously is not needed when the antifreeze heating body running of temperature controller control series connection will result in
Make, causes unnecessary energy waste.
In the present embodiment, the heating power of calandria 2 can be different according to different setting positions, for example, due to hot water
4 water inlet of device, water outlet temperature compared with the temperature inside water heater 4,4 water inlet of water heater, water outlet temperature drop
It is low very fast, therefore, 4 water inlet of water heater, water outlet the heating power of calandria be greater than the calandria inside water heater 4
Heating power.
Embodiment two
As shown in Figure 1, in the present embodiment, the temperature in the region where any temperature controller 3 detects corresponding calandria 2
When degree is abnormal, the controllable heat water producer 4 of temperature controller 3 is sounded an alarm, and prompts user corresponding region temperature anomaly.By making temperature controller exist
Detect that control water heater sounds an alarm after the temperature of corresponding calandria region is abnormal, and can prompt user corresponding in time
Region is abnormal, and temperature controller can normally control later water heater stopping in the temperature of region and sound an alarm, user
The working condition of calandria can be understood in time, and finds the exception of calandria in time, while can accurately confirm that is be abnormal adds
The position of hot body, facilitates maintenance personal to repair it.
In the present embodiment, when any temperature controller 3 detects that the temperature of corresponding calandria region is set lower than first
When definite value, temperature controller 3 controls water heater 4 and sounds an alarm, until the temperature of 2 region of calandria is not less than the first setting value.
In the present embodiment, when any temperature controller 3 detects that the temperature of corresponding 2 region of calandria is set lower than first
When definite value, temperature controller 3 controls corresponding branch connection, and corresponding calandria 2 is electrically connected with power supply module 1, and calandria 2 starts work
Make, region is heated；Meanwhile temperature controller 3 controls water heater 4 and sounds an alarm, and prompts user 2 location of calandria
The temperature in domain is lower than the first setting value, until the temperature heated object 2 of region is heated to not less than the first setting value, temperature control
Device 3 controls the stopping of water heater 4 and sounds an alarm, and prompts user's water heater 4 normal.
In the present embodiment, when any temperature controller 3 detects that the temperature of corresponding calandria region is higher than second and sets
When definite value, temperature controller 3 controls water heater 4 and sounds an alarm, until the temperature of 2 region of calandria is not higher than the second setting value.
In the present embodiment, when any temperature controller 3 detects that the temperature of corresponding 2 region of calandria is higher than second and sets
When definite value, temperature controller 3 controls corresponding branch and disconnects, and corresponding calandria 2 is electrically connected with the disconnection of power supply module 1, and calandria 2 stops work
Make, region is stopped heating；Meanwhile temperature controller 3 controls water heater 4 and sounds an alarm, and prompts user 2 location of calandria
The temperature in domain is higher than the second setting value, until the temperature of region is reduced to not higher than the second setting value, temperature controller 3 controls heat
The stopping of hydrophone 4 sounds an alarm, and prompts user's water heater 4 normal.
Embodiment three
As shown in Figure 1, describing a kind of water heater 4 in the present embodiment, which is provided with embodiment one and two as above
In a kind of any antifreeze heating device of water heater.The antifreeze heating device of the water heater includes power supply module and multiple heating
Body.It is electrically connected after multiple calandrias 2 are parallel with one another with power supply module 1, since each calandria 2 is parallel with one another, each calandria 2
It can work independently, be independent of each other.One temperature controller 3 of series connection, each temperature controller 3 can be examined respectively respectively for each 2 place branch road of calandria
The temperature of corresponding 2 region of calandria is surveyed, to control the connection or disconnection of corresponding branch, so that corresponding calandria 2 is opened
Begin or stops working.
In the present embodiment, which includes shell, and inside housings, shell is equipped with aobvious for antifreeze heating device setting
Showing device, when any temperature controller 3 detects the temperature of corresponding 2 region of calandria lower than the first setting value, He Huohuo
When higher than the second setting value, which issues alarm signal, and display device receives the alarm signal, and displays temperature occurs
Abnormal region；When temperature controller 3 detects that the temperature of corresponding 2 region of calandria is in normal value, which is issued
Signal, display device receives the signal, and displays temperature is normal.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this patent
Member without departing from the scope of the present invention, when the technology contents using above-mentioned prompt make it is a little change or be modified to
The equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above embodiments, in the range of still falling within the present invention program.
Claims (10)
1. a kind of antifreeze heating device of water heater characterized by comprising
Power supply module；
Multiple calandrias are electrically connected after parallel with one another, with power supply module；
One temperature controller of series connection, each temperature controller detect corresponding calandria region respectively respectively for branch road where each calandria
Temperature, to control the connection or disconnection of corresponding branch, so that corresponding calandria starts or stops work.
2. the antifreeze heating device of a kind of water heater according to claim 1, which is characterized in that calandria is arranged in water heater
At interior different location, when each temperature controller detects the temperature of corresponding calandria region lower than the first setting value, temperature controller
Corresponding branch connection is controlled, corresponding calandria is started to work, heated to region.
3. the antifreeze heating device of a kind of water heater according to claim 2, which is characterized in that each temperature controller detects correspondence
When the temperature of calandria region is higher than the second setting value, temperature controller controls corresponding branch and disconnects, and corresponding calandria stops work
Make, region is stopped heating.
4. the antifreeze heating device of a kind of water heater according to claim 2 or 3, which is characterized in that each temperature controller is close to right
Calandria is answered to be arranged, with the accurate temperature for detecting corresponding calandria periphery.
5. the antifreeze heating device of a kind of water heater according to any one of claims 1 to 4, which is characterized in that calandria and right
Temperature controller is answered to be arranged at the inside of the water inlet of water heater, water outlet and water heater.
6. the antifreeze heating device of a kind of water heater according to claim 5, which is characterized in that the heating power of calandria can
Different according to different setting positions, the heating power of the calandria at water heater entery and delivery port is greater than inside water heater
The heating power of calandria.
7. the antifreeze heating device of a kind of water heater according to any one of claims 2 to 6, which is characterized in that when any one
When temperature controller detects the temperature of corresponding calandria region lower than the first setting value, temperature controller controls water heater and issues police
Report, until the temperature of corresponding calandria region is not less than the first setting value.
8. according to a kind of any antifreeze heating device of water heater of claim 3 to 7, which is characterized in that when any one
When temperature controller detects that the temperature of corresponding calandria region is higher than the second setting value, temperature controller controls water heater and issues police
Report, until the temperature of corresponding calandria region is not higher than the second setting value.
9. a kind of water heater, which is characterized in that the water heater is provided with a kind of any hot water of claim 1 to 8 as above
The antifreeze heating device of device.
10. a kind of water heater according to claim 9, which is characterized in that the water heater is equipped with display device, when any
One temperature controller detects the temperature of corresponding calandria region lower than the first setting value and/or or higher than the second setting value
When, which issues alarm signal, and display device receives the alarm signal, and the region that displays temperature is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276855.XA CN110131898A (en) | 2019-04-08 | 2019-04-08 | Water heater and freeze-proof heating device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276855.XA CN110131898A (en) | 2019-04-08 | 2019-04-08 | Water heater and freeze-proof heating device thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN110131898A true CN110131898A (en) | 2019-08-16 |
Family
ID=67569574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910276855.XA Pending CN110131898A (en) | 2019-04-08 | 2019-04-08 | Water heater and freeze-proof heating device thereof |
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| Country | Link |
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| CN (1) | CN110131898A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110895043A (en) * | 2019-11-25 | 2020-03-20 | 华帝股份有限公司 | Smoke collecting hood with heating device and gas water heater using same |
| CN111405255A (en) * | 2020-05-15 | 2020-07-10 | 广西南宁导思电子科技有限公司 | Thawing apparatus for closed circuit television monitoring based on water freezing expansion principle |
| CN114838506A (en) * | 2022-05-06 | 2022-08-02 | 珠海格力电器股份有限公司 | Anti-freezing and anti-dry-burning device, water heater and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110895043A (en) * | 2019-11-25 | 2020-03-20 | 华帝股份有限公司 | Smoke collecting hood with heating device and gas water heater using same |
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| CN114838506A (en) * | 2022-05-06 | 2022-08-02 | 珠海格力电器股份有限公司 | Anti-freezing and anti-dry-burning device, water heater and control method thereof |
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Application publication date: 20190816 |