CN110388753A - A kind of electric heater is without electric cleaning control system, intelligent shower head and electric heater - Google Patents
A kind of electric heater is without electric cleaning control system, intelligent shower head and electric heater Download PDFInfo
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- CN110388753A CN110388753A CN201910599213.3A CN201910599213A CN110388753A CN 110388753 A CN110388753 A CN 110388753A CN 201910599213 A CN201910599213 A CN 201910599213A CN 110388753 A CN110388753 A CN 110388753A
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- power supply
- electric heater
- master control
- control borad
- leakage
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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
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
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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)
- Bathtubs, Showers, And Their Attachments (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Selective Calling Equipment (AREA)
Abstract
The present invention discloses a kind of electric heater without electric cleaning control system, including intelligent shower head and electric heater, and the electric heater includes that power supply line and the first communication module are protected in electric heater main body, master control borad, leakage；The intelligent shower head includes: shower main body, power supply device, water flow sensing unit, the second communication module, master controller and display and operation module；It is characterized in that, master control borad is protected power supply line with leakage and is connect, power-off signal is sent when water flow sensing unit detects water-flow signal to master control borad, the master control borad sends power down control signal and protects power supply line to guarantor's power supply line, leakage is leaked and receive power down control signal disconnection zero, fiery, three pole power supply of ground wire；When the display and operation module inputs button operation, no matter whether the water flow sensing unit detects that water-flow signal, all transmission power supply signal control the leakage and protect power supply line closure zero, fire, three pole power supply of ground wire to master control borad.Invention additionally discloses a kind of intelligent shower head and electric heaters.
Description
Technical field
The present invention relates to electric heater technical fields more particularly to a kind of electric heater without electric cleaning control system, intelligence flower
It spills and electric heater.
Background technique
Currently, electric heater has become the household electrical appliance generally used in family.The installation site ratio of most of water heaters
It is higher or be mounted on outside bathroom, when user needs to adjust water temperature during bathing, user need to touch water heater or
Person finds the remote controler of water heater, or even sometimes for the adjusting for carrying out water temperature outside bathroom to water heater, gives user's Bath band
It is inconvenient to come.
In order to guarantee itself the person and property safety, user generally pulls out plug before bathing, and power failure bathing is long-term to insert
Damage can be likely to cause for the plug of electric heater by pulling out, but during user's bathing, if electric heater is in work
Make state, once leaking electricity inside electric heater, electric current is easy to be transmitted to human body by water, it is easy to electric shock danger occur
Danger.And after electric heater power-off, machine itself can not powered operation, user do not simply fail to learn hot water during bathing
The surplus of amount can not also operate water heater, bring undesirable bathing experience.
Summary of the invention
Aiming at the problems existing in the prior art, the purpose of the present invention is to provide one kind can be by intelligent shower head to electricity
Water heater carries out wake-up and the electric heater remotely controlled without electric cleaning control system in the power-off state.
Another object of the present invention is to provide one kind to have from operating system and remote control electric heater control system
The intelligent shower head of system.
The present invention also provides a kind of electric heaters.
To achieve the above objectives, the present invention adopts the following technical scheme:
Without electric cleaning control system, including electric heater and intelligent shower head, the electric heater includes: electricity for a kind of electric heater
Water heater main body, the master control borad being mounted in the electric heater main body, leakage protect power supply line, reset capacitance and the first communication
Module, the master control borad control the heating, display, button operation of the electric heater, and the leakage protects power supply line and is used to control institute
The on-off of three pole of power supply of electric heater main body is stated, the reset capacitance is master control borad power supply, first communication module
It connect with the master control borad for receiving and sending messages；
The intelligent shower head includes: shower main body, power supply device, the water flow sensing unit, second being mounted in the shower main body
Communication module, master controller and display and operation module, the power supply device are master controller power supply, the water flow sensing
Device, second communication module and the display and operation module are all connect with the master controller；
First communication module and the second communication module both-way communication；
It is connect it is characterized in that, the master control borad protects power supply line with the leakage, when the water flow sensing unit detects water-flow signal
When, power-off signal can be sent to the master control borad, then the master control borad sends power down control signal and protects power supply line to the leakage,
The leakage protects power supply line and disconnects zero, fire, three pole power supply of ground wire after receiving power down control signal；
When the display and operation module inputs button operation, no matter whether the water flow sensing unit detects water-flow signal,
Power supply signal is all sent to the master control borad, then the master control borad sends power supplying control signal and protects power supply line, institute to the leakage
It states leakage guarantor's power supply line and is closed zero, fire, three pole power supply of ground wire after receiving power supplying control signal.
It is further preferred that the water flow value of intelligent shower head described in the water flow sensor real-time detection, when detecting
When water flow value >=setting value, the master controller sends power-off signal to first communication by the second communication module
Module, the master control borad receive control after the power-off signal of first communication module leakage protect power supply line disconnect zero, fire,
Three pole power supply of line.
It is further preferred that setting value is 2L/min.
It is further preferred that after the display and operation module stops input button operation for a period of time, the main control
Think highly of new root and detects that water-flow signal judges whether to send power-off signal to the master control borad according to the water flow sensing unit.
It is further preferred that one end time is 5-10s.
It is further preferred that being equipped with the remaining hot water viewing area of the electric heater in the display and operation module
Domain, current liner temperature display region and current bathing mode display region.
It is further preferred that on & off switch, mode key, temperature adjusting key are equipped in the display and operation module, it is described to open
Key is used to control the power switch of the electric heater, and the mode key is used to switch the operating mode of the electric heater,
The temperature adjusting key is used to adjust the liner hot water target temperature of the electric heater.
It is further preferred that first wireless communication module and second wireless communication module be bluetooth module,
WiFi module, RF radio-frequency module, ZigBee communication module, Modbus communication module or 433m wireless module.
A kind of intelligent shower head, including shower main body, which is characterized in that be equipped in the shower main body: wireless control dress
It sets, the control device of wireless includes: rear shell, the master controller mounting plate being mounted in the rear shell and is pasted onto the rear shell
On display and operation screen, on the master controller mounting plate be equipped with master controller and wireless communication chips, the display and operation
Sealing ring is equipped between screen and the rear shell；Water flow sensor, the water flow sensor are connect with the master controller, are used
In the water flow value for detecting the intelligent shower head；Power supply device, the power supply device connect with the control device of wireless and are
Power supply.
Electricity is protected in a kind of electric heater, including electric heater main body, the master control borad being mounted in the electric heater main body, leakage
Source line, reset capacitance and the first communication module, the master control borad control heating, display, the key behaviour of the electric heater
Make, the on-off that power supply line is used to control three pole of power supply of the electric heater main body is protected in the leakage, and the reset capacitance is described
Master control borad power supply, first communication module are connect with the master control borad for receiving and sending messages；It is characterized in that, the master control borad
It protects power supply line with the leakage to connect, the leakage protects power supply line and the electric heating is opened or closed according to the instruction that the master control borad issues
Water machine body zero, fire, three pole power supply of ground wire.
The beneficial effects of the present invention are:
One, it is built-in in intelligent shower head from operating system and remote control control system of electric water heater, intelligence can be passed through
Shower manipulates electric heater, to reduce the limitation of electric heater installation environment.It, can three pole of auto power off before bathing；In
During bathing, three pole of turn on automatically power supply, the electric heater during realization bathing it can also manipulate on demand.
Two, it may be implemented the half of water heater and hide or hide full installation；The display and operation module of intelligent shower head can be shown in real time
The real time status information for showing electric heater as remaining hot water shows, remaining bathing time, temperature display, and can be carried out key
Operation achievees the purpose that manipulate electric heater to wake up water heater energization.
Three, water flow sensor detection water flow value is installed in intelligent shower head, is controlled by the size of water flow value
The switching of electric heater power supply, can safe bathing.
Detailed description of the invention
Fig. 1 show the structure chart provided by the invention without electric cleaning control system.
Fig. 2 show the schematic diagram provided by the invention without electric cleaning control system.
Fig. 3 show the structure chart of the display and operation module of intelligent shower head provided by the invention.
Fig. 4 show the structure chart of the control device of wireless of intelligent shower head provided by the invention.
Description of symbols:
1: intelligent shower head, 2: control device of wireless, 3: electric heater, 4: sealing ring, 5: master controller mounting plate, 6: after
Shell, 7: remaining hot water viewing area, 8: functional areas, 9: viewing area, 10: Mode Areas, 11: master controller, 12: display and operation screen.
Specific embodiment
In the description of the present invention, it should be noted that " transverse direction ", " vertical if any term " center " for the noun of locality
To ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top",
The indicating positions such as "bottom", "inner", "outside", " clockwise ", " counterclockwise " and positional relationship are orientation based on the figure or position
Relationship is set, the narration present invention is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It constructs and operates with specific orientation, with particular orientation, should not be understood as limiting specific protection scope of the invention.
In addition, being used for description purposes only if any term " first ", " second ", it is not understood to indicate or imply relatively heavy
The property wanted or the quantity for implicitly indicating technical characteristic." first " is defined as a result, " second " feature can be expressed or implicit include
One or more this feature, in the present description, " at least " are meant that one or more, unless otherwise clearly having
The restriction of body.
In the present invention, except as otherwise clear stipulaties and restriction, should make if any term " assembling ", " connected ", " connection " term
Broad sense goes to understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It is also possible to mechanical connect
It connects；It can be directly connected, be also possible to be connected by intermediary, can be and be connected inside two elements.For ability
For the those of ordinary skill of domain, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In invention, unless otherwise specified and limited, fisrt feature second feature "upper" or "lower" may include
First and second features directly contact, also may include fisrt feature and second feature be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " under " and " above " include fisrt feature
Right above two features and oblique upper, or be only to indicate that first feature horizontal height is higher than the height of second feature.Fisrt feature
Second feature " on ", " under " and " below " include that fisrt feature is directly under or diagonally below the second feature, or only table
Show first feature horizontal height lower than second feature.
Below with reference to the attached drawing of specification, a specific embodiment of the invention is further described, is made of the invention
Technical solution and its benefits are clearer.It describes embodiment below with reference to attached drawing to be exemplary, it is intended to solve
The present invention is released, and is not considered as limiting the invention.
Embodiment one
As shown in Figure 1-Figure 3, a kind of electric heater is without electric cleaning control system, including electric heater 3 and intelligent shower head 1, institute
Stating electric heater 3 includes: electric heater main body, master control borad, the leakage guarantor power supply line, reset being mounted in the electric heater main body
Capacitor and the first communication module, the master control borad control the heating, display, button operation of the electric heater, and the leakage is protected
Power supply line is used to control the on-off of three pole of power supply of the electric heater main body, and the reset capacitance is master control borad power supply,
First communication module is connect with the master control borad for receiving and sending messages；The intelligent shower head 1 includes: shower main body, installation
Power supply device, water flow sensing unit, the second communication module, master controller and display and operation module in the shower main body, institute
Power supply device is stated as master controller power supply, the water flow sensor, second communication module and the display and operation
Module is all connect with the master controller；First communication module and the second communication module both-way communication；Its feature exists
In the master control borad is protected power supply line with the leakage and connect, and when the water flow sensing unit detects water-flow signal, can send power-off
Signal gives the master control borad, and then the master control borad sends power down control signal and protects power supply line to the leakage, and power supply is protected in the leakage
Line disconnects zero, fire, three pole power supply of ground wire after receiving power down control signal；When the display and operation module inputs button operation
When, no matter whether the water flow sensing unit detects that water-flow signal, all transmission power supply signal are then described to the master control borad
Master control borad sends power supplying control signal and protects power supply line to the leakage, and the leakage is protected power supply line and closed after receiving power supplying control signal
Close zero, fire, three pole power supply of ground wire.
Wherein, when electric heater is under energized state, power transformer can be by the supply voltage of 220V in master control borad
Be converted into 5VDC, the main control circuit of master control borad, display screen and and the electronic components such as touch key-press of display screen supplied using 5VDC
Electricity, reset capacitance charges at this time, and master control borad is for controlling display screen, touch key-press and the first communication module.Work as electric hot water
Device is under off-position, and the governor circuit of master control borad is in low power operation state, is powered by reset capacitance.
The water flow size of intelligent shower head described in water flow sensor real-time detection, when detecting water flow value L >=2L/min
When, the master controller of intelligent shower head sends power-off signal to first communication module, electric heating by the second communication module
The master control borad of hydrophone, which receives to control the leakage after the power-off signal of first communication module and protect power supply line, disconnects power supply.
After electric heater disconnects 220V power supply, electric heater stops heating, and user can carry out safe bathing.As long as but
User's progress button operation can wake up water heater power supply and operate.The master controller is by the display and operation module
Button operation generates power on signal and the power on signal is sent to the first communication mould by second communication module
Block, the master control borad of electric heater are received to control the leakage after the power on signal of first communication module and protect power supply line and be connected
Power supply.When user carries out button operation, no matter whether water flow sensing unit detects that water flow value, master controller will not all be sent out
Send power-off signal to radio to the master control borad of electric heater to the second communication module to be powered off, can only send reset signal to
Second communication module is transferred to electric heater master control borad and is resetted.Even if meaning user is not in bathing process is cut off the water in this way
Water heater can be operated.
After intelligent shower head is without 5-10s after picking button operation, master controller is again according to water flow sensing unit detection
The water flow value of intelligent shower head judges whether to send power-off signal to electric heater.
Preferably, second communication module and first communication module carry out both-way communication to receive the electric hot water
The real time status information of device is simultaneously shown by the display and operation module.Existing electric heater can display function basis
On, the display and operation module of intelligent shower head is equipped with functional areas 8, viewing area 9, Mode Areas 10, remaining hot water viewing area 7 and presses
Key.Wherein, surplus hot water's tolerance viewing area 7, which can be observed, can use remaining hot water, and functional areas 8 show the mode of water heater at that time
State, viewing area 9 are display Current Temperatures and remaining bathing time, and Mode Areas 10 can display water heater current state.It is described
Key includes on & off switch, mode key, temperature adjusting key, and the on & off switch is used to control the power switch of the electric heater, institute
The operating mode that mode key is used to switch the electric heater is stated, the temperature adjusting key is used to adjust the interior of the electric heater
Gallbladder-heat water target temperature.
It is further preferred that first wireless communication module and second wireless communication module be bluetooth module,
WiFi module, RF radio-frequency module, ZigBee communication module, Modbus communication module or 433m wireless module.
Compared with prior art, provided in this embodiment a kind of with the wireless telecommunications intelligent shower head for washing function without electricity, tool
There are following characteristics: 1) being built-in in intelligent shower head from operating system and remote control control system of electric water heater, intelligence can be passed through
Can shower manipulate electric heater, to reduce the limitation of electric heater installation environment, when bathing, can operate water heater, and heat may be implemented
The half of hydrophone hides or complete hide is installed.2) water flow sensor detection water flow value is installed in intelligent shower head, passes through water
The switching of the size control electric heater power supply of flow value, can safe bathing；And in the display and operation of user's operation intelligent shower head
It when module, powers and wakes up to electric heater automatically, do not influence the electric heater control during bathing.3) display of intelligent shower head
Operational module is used to show the real time status information of electric heater, as remaining hot water show, remaining bathing time, temperature are shown
Show, and can be carried out button operation and achieve the purpose that manipulate electric heater to wake up water heater energization.
Embodiment two
As shown in figure 4, a kind of intelligent shower head, including shower main body, which is characterized in that it is equipped in the shower main body:
Control device of wireless, the control device of wireless include: rear shell 6, the master controller mounting plate being mounted in the rear shell 6
5 and the display and operation screen 12 that is pasted onto the rear shell 6, master controller 11 and nothing are equipped on the master controller mounting plate 5
Line communication chip is equipped with sealing ring 4 between the display and operation screen 12 and the rear shell 6；
Water flow sensor, the water flow sensor are connect with the master controller, for detecting the water of the intelligent shower head
Flow value；Power supply device, the power supply device connect with the control device of wireless and power for it.
Wherein, master controller generates power on signal according to the button operation of the display and operation screen and passes through the channel radio
It interrogates chip and the power on signal is sent to electric heater；When the master controller is without the key for receiving the display and operation screen
After operating 5-10s, the master controller judges whether to send power-off signal to electric heater according to water flow value.
Preferably, the waterproofing grade of control device of wireless requires to reach IPX4.
The power supply device is battery.The mode that installation battery (5V) can be used in intelligent shower head is directly powered, internal
Master controller 5V power supply；Intelligent shower head can also connect alternating current, and 5V powers after turning direct current using the supply voltage of 220V.
The beneficial effect that intelligent shower head provided in this embodiment has embodiment one all, as the specific knot of intelligent shower head
Structure can be various structures that are existing known or can be realized in the future, repeat no more herein.
Embodiment three
Electricity is protected in a kind of electric heater, including electric heater main body, the master control borad being mounted in the electric heater main body, leakage
Source line, reset capacitance and the first communication module, the master control borad control heating, display, the key behaviour of the electric heater
Make, the on-off that power supply line is used to control three pole of power supply of the electric heater main body is protected in the leakage, and the reset capacitance is described
Master control borad power supply, first communication module are connect with the master control borad for receiving and sending messages；It is characterized in that, the master control borad
It protects power supply line with the leakage to connect, the leakage protects power supply line and the electric heating is opened or closed according to the instruction that the master control borad issues
Water machine body zero, fire, three pole power supply of ground wire.
Wherein, the master control borad receive the control instruction of first communication module to the electric heater carry out control and
The real time status information of the electric heater is fed back to first communication module.
Preferably, when electric heater is under off-position, the governor circuit of master control borad is in low power operation state, by
The reset capacitance is powered.
The beneficial effect that electric heater provided in this embodiment has embodiment one all, as the specific knot of electric heater
Structure can be various structures that are existing known or can be realized in the future, repeat no more herein.
From the foregoing description of structures and principles it should be understood by those skilled in the art that, the present invention not office
It is limited to above-mentioned specific embodiment, this hair is all fallen within using the improvement of techniques well known and substitution on the basis of the present invention
Bright protection scope, protection scope of the present invention should limit it by each claim and its equivalent.In specific embodiment
The part not illustrated is the prior art or common knowledge.
Claims (10)
1. a kind of electric heater includes: electric heating without electric cleaning control system, including electric heater and intelligent shower head, the electric heater
Water machine body, the master control borad being mounted in the electric heater main body, leakage protect power supply line, reset capacitance and the first communication mould
Block, the master control borad control the heating, display, button operation of the electric heater, and it is described for controlling that power supply line is protected in the leakage
The on-off of three pole of power supply of electric heater main body, the reset capacitance be the master control borad power supply, first communication module with
The master control borad connection is used to receive and send messages；The intelligent shower head includes: shower main body, the electricity being mounted in the shower main body
Source device, water flow sensing unit, the second communication module, master controller and display and operation module, the power supply device are the master control
Device processed power supply, the water flow sensor, second communication module and the display and operation module all with the master controller
Connection；
First communication module and the second communication module both-way communication；
It is connect it is characterized in that, the master control borad protects power supply line with the leakage, when the water flow sensing unit detects water-flow signal
When, power-off signal can be sent to the master control borad, then the master control borad sends power down control signal and protects power supply line to the leakage,
The leakage protects power supply line and disconnects zero, fire, three pole power supply of ground wire after receiving power down control signal；
When the display and operation module inputs button operation, no matter whether the water flow sensing unit detects water-flow signal,
Power supply signal is all sent to the master control borad, then the master control borad sends power supplying control signal and protects power supply line, institute to the leakage
It states leakage guarantor's power supply line and is closed zero, fire, three pole power supply of ground wire after receiving power supplying control signal.
2. a kind of electric heater according to claim 1 is without electric cleaning control system, which is characterized in that the water flow sensing
The water flow value of intelligent shower head described in device real-time detection, when detecting water flow value >=setting value, the master controller passes through
The second communication module sends power-off signal to first communication module, and the master control borad receives first communication module
Power-off signal after control the leakage and protect power supply line and disconnect zero, fire, three pole power supply of ground wire.
3. a kind of electric heater according to claim 2 is without electric cleaning control system, which is characterized in that the setting value is
2L/min。
4. a kind of electric heater according to claim 1 is without electric cleaning control system, which is characterized in that when the display and operation
After module stops input button operation for a period of time, the master controller detects that water flow is believed according to the water flow sensing unit again
Number judge whether to send power-off signal to the master control borad.
5. a kind of electric heater according to claim 4 is without electric cleaning control system, which is characterized in that one end time is
5-10s。
6. a kind of electric heater according to claim 1 is without electric cleaning control system, which is characterized in that in the display and operation
Module is equipped with remaining hot water display area, current liner temperature display region and the current bathing mode of the electric heater
Display area.
7. a kind of electric heater according to claim 1 is without electric cleaning control system, which is characterized in that in the display and operation
Module is equipped on & off switch, mode key, temperature adjusting key, and the on & off switch is used to control the power switch of the electric heater,
The mode key is used to switch the operating mode of the electric heater, and the temperature adjusting key is used to adjust the electric heater
Liner hot water target temperature.
8. a kind of electric heater according to claim 1 is without electric cleaning control system, which is characterized in that first channel radio
News module and second wireless communication module be bluetooth module, WiFi module, RF radio-frequency module, ZigBee communication module,
Modbus communication module or 433m wireless module.
9. a kind of intelligent shower head, including shower main body, which is characterized in that be equipped in the shower main body:
Control device of wireless, the control device of wireless include: rear shell, be mounted on master controller mounting plate in the rear shell and
The display and operation screen being pasted onto the rear shell is equipped with master controller and wireless communication core on the master controller mounting plate
Piece is equipped with sealing ring between the display and operation screen and the rear shell；
Water flow sensor, the water flow sensor are connect with the master controller, for detecting the water of the intelligent shower head
Flow value；
Power supply device, the power supply device connect with the control device of wireless and power for it.
10. a kind of electric heater, including electric heater main body, electricity is protected in the master control borad being mounted in the electric heater main body, leakage
Source line, reset capacitance and the first communication module, the master control borad control heating, display, the key behaviour of the electric heater
Make, the on-off that power supply line is used to control three pole of power supply of the electric heater main body is protected in the leakage, and the reset capacitance is described
Master control borad power supply, first communication module are connect with the master control borad for receiving and sending messages；It is characterized in that, the master control borad
It protects power supply line with the leakage to connect, the leakage protects power supply line and the electric heating is opened or closed according to the instruction that the master control borad issues
Water machine body zero, fire, three pole power supply of ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910599213.3A CN110388753B (en) | 2019-07-04 | 2019-07-04 | Electric water heater does not have washing control system, intelligent gondola water faucet and electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910599213.3A CN110388753B (en) | 2019-07-04 | 2019-07-04 | Electric water heater does not have washing control system, intelligent gondola water faucet and electric water heater |
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| CN110388753A true CN110388753A (en) | 2019-10-29 |
| CN110388753B CN110388753B (en) | 2021-05-14 |
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| CN205783850U (en) * | 2016-05-31 | 2016-12-07 | 广东万家乐燃气具有限公司 | A kind of control system of electric water heater of intelligence power-off |
| CN206670081U (en) * | 2017-03-09 | 2017-11-24 | 广东万家乐燃气具有限公司 | A kind of electric heater control system of switching on or off electricity system |
| CN106911176A (en) * | 2017-03-24 | 2017-06-30 | 广东万家乐燃气具有限公司 | A kind of safety device of electric heater with self-powered function |
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