CN102434911B - control method and device for hot water circulation - Google Patents
control method and device for hot water circulation Download PDFInfo
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- CN102434911B CN102434911B CN201110345956.1A CN201110345956A CN102434911B CN 102434911 B CN102434911 B CN 102434911B CN 201110345956 A CN201110345956 A CN 201110345956A CN 102434911 B CN102434911 B CN 102434911B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000008399 tap water Substances 0.000 claims description 8
- 235000020679 tap water Nutrition 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007616 round robin method Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a control method and a control device for hot water circulation, which are used for solving the problem of heat energy loss caused by unreasonable hot water circulation in the prior art. The method comprises the following steps: controlling the circulating pump to be started when the temperature of the water outlet of the water tank meets a first preset temperature condition and to be closed for the first time when the temperature of the water inlet of the water tank meets a second preset temperature condition; controlling the circulating pump to be started when the temperature of the water inlet of the water tank meets a third preset temperature condition and to be closed for the second time when the temperature of the water inlet of the water tank meets a second preset temperature condition; and controlling the circulating pump to be started when the second closing time meets the first preset time condition, and to be closed for the third time when the second preset time condition is met, wherein the second preset time condition is the time required by hot water to circulate from the water outlet of the water tank to the farthest water using point. By adopting the technical scheme of the invention, the time interval of the hot water circulation system can be automatically adjusted according to the actual condition of the water pipeline, the hot water circulation effect is met, and the energy loss is reduced.
Description
Technical field
The invention belongs to field of water heaters, relate to control method and the device of a kind of hot water circuit.
Background technology
Now commonly use domestic hot-water's endless form and have four kinds: the first manual cycle, i.e. user are opened pump power and just carried out
Hot water circuit；The second reservation timing cycle, i.e. controller opened according to hot water line's temperature conditions in the agreement period
Stop water circulating pump；The third round-robin method is to detect and use water spot temperature arranging temperature sensor with water end, according to
ON cycle water pump is decided whether by water spot temperature；4th kind of round-robin method is to arrange on the return pipe in water heater
Temperature sensor detects line temperature, decides whether ON cycle water pump according to temperature at this.
The shortcoming of the most several domestic hot-water's endless form is it is clear that the shortcoming of the first manual cycle mode is user uses
Shi Caikai, the waiting time, such as washes time hands a few minutes to be waited, it has not been convenient to.The shortcoming of the second round-robin method is
Solving the cold water problem before shower, unresolved variable interval is on a small quantity by cold water problem during water.The third round-robin method
Shortcoming is to arrange that temperature probe is inconvenient with water spot, the installation popping one's head in and go between and keep in repair relatively difficult.Installed
Position living environment and mounting means impact, poor reliability, be easily damaged.The shortcoming of the 4th kind of round-robin method is thermometric
Probe positions can not straight tube reflection water spot temperature, easily by ambient temperature at this and be connected pipeline heat insulation situation change shadow
Ring, cause circulating irrational start-stop.
In the prior art, existing for making hot water circuit, circulating pump start-stop is unreasonable and the problem of heat energy loss that causes,
And for this problem, effective solution is the most not yet proposed.
Summary of the invention
The main object of the present invention is to provide control method and the device of a kind of hot water circuit, to solve to follow in prior art
The problem of the heat energy loss that ring pump start-stop is unreasonable and causes.
To achieve these goals, according to an aspect of the invention, it is provided the control method of a kind of hot water circuit.
The control method of the hot water circuit of the present invention includes: step S10: control circulating pump full in water outlet of water tank temperature
Open during foot the first preset temperature condition, and when water tank inlet temperature meets the second preset temperature condition for the first time
Close；Step S30: control circulating pump and open when water tank inlet temperature meets the 3rd preset temperature condition, and
When water tank inlet temperature meets the second preset temperature condition, second time is closed；And step S50: control circulating pump
Open when the second time shut-in time meets the first Preset Time condition, and when meeting the second Preset Time condition the
Closing for three times, the second Preset Time condition is the hot water time needed for water outlet of water tank is recycled to farthest with water spot.
Further, step S10 includes: step S100: judge whether water outlet of water tank temperature meets first and preset
Temperature conditions, and start circulating pump in a case of yes；And step S102: judge whether circulating pump runs the 3rd
Preset Time condition, and where it has, judge whether water tank inlet temperature meets the second preset temperature condition,
And where it has, close circulating pump for the first time.
Further, after step slo, the method also includes: S20: judge that water tank inlet temperature is the fullest
Foot the 4th preset temperature condition, if so, performs step S30, if it is not, whether judge the circulating pump shut-in time for the first time
Meet the 4th Preset Time condition, and where it has, return and perform step S10.
Further, step S30 includes: step S301: judge whether water tank inlet temperature meets the 3rd and preset
Temperature conditions, if so, ON cycle pump, wherein, the 3rd preset temperature condition value is that tap water stops filling into rear water
The temperature of case；And step S303: judge whether water tank inlet temperature meets in the second preset temperature condition, if
It is that second time closes circulating pump.
Further, step S50 includes: step S502: judge whether the circulating pump second time shut-in time meets the
One Preset Time condition, if so, ON cycle pump, wherein, the first Preset Time condition is that the second time shut-in time is big
In equal to Δ tn, initial value Δ t1=Δ t0, wherein, the value of Δ t0 is that water-heater water tank ambient temperature Te adds
Upper constant predetermined amount；And step S504: judge whether the circulating pump opening time meets the second Preset Time condition, if
It is that third time closes circulating pump.
Further, after step S504, the method also includes: whether judge the third time shut-in time of circulating pump
More than or equal to the 5th Preset Time condition, and where it has, return and perform step S502.
According to a further aspect in the invention, it is provided that the control device of a kind of hot water circuit.
The control device of the hot water circuit of the present invention includes: the first control module, is used for controlling circulating pump in water tank water outlet
Mouth temperature is opened when meeting the first preset temperature condition, and meets the second preset temperature condition in water tank inlet temperature
Time close for the first time；Second control module, is used for controlling circulating pump and meets the 3rd preset temperature in water tank inlet temperature
Open during condition, and second time is closed when water tank inlet temperature meets the second preset temperature condition；And the 3rd
Control module, is used for controlling circulating pump and opens when the second time shut-in time meets the first Preset Time condition, Yi Ji
When meeting the second Preset Time condition, third time is closed, and the second Preset Time condition is that hot water is recycled to from water outlet of water tank
Time needed for farthest water spot.
Further, the first control module includes: the first judge module, is used for judging that water outlet of water tank temperature is the fullest
Foot the first preset temperature condition, and start circulating pump in a case of yes；And second judge module, follow for judgement
Whether ring pump runs the 3rd Preset Time condition, and where it has, judges whether water tank inlet temperature meets
Two preset temperature conditions, and where it has, close circulating pump for the first time.
Further, the second control module includes: the 3rd judge module, is used for judging that water tank inlet temperature is the fullest
Foot the 3rd preset temperature condition, wherein, the 3rd preset temperature condition value is the temperature that tap water stops filling into rear water box；
If so, ON cycle pump；And the 4th judge module, it is used for judging whether water tank inlet temperature meets second pre-
If temperature conditions, if so, second time closes circulating pump.
Further, the 3rd control module includes: the 5th judge module, is used for judging the circulating pump second time shut-in time
Whether meeting the first Preset Time condition, if so, ON cycle pump, wherein, the first Preset Time condition is second time
Shut-in time is more than or equal to Δ tn, and initial value Δ t1=Δ t0, wherein, the value of Δ t0 is water-heater water tank environment
Temperature Te adds constant predetermined amount；And the 6th judge module, it is used for judging whether the circulating pump opening time meets second
Preset Time condition, if so, third time closes circulating pump.
According to technical scheme, contribute to automatically adjusting hot water cyclesystem according to the practical situation of water lines
Time interval, both met the effect of hot water circuit, reduced again energy loss.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the key step of the control method of hot water circuit according to embodiments of the present invention；
Fig. 2 is the flow chart of the concrete steps of the control method of hot water circuit according to embodiments of the present invention；And
Fig. 3 is the primary structure schematic diagram controlling device of hot water circuit according to embodiments of the present invention.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Combination mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 1 is the flow chart of the key step of the control method of hot water circuit according to embodiments of the present invention.
Shown in Figure 1, the control method of the hot water circuit of the present invention includes:
Step S10: control circulating pump and open when water outlet of water tank temperature TU meets the first preset temperature condition, with
And close for the first time when water tank inlet temperature TI meets the second preset temperature condition；
Step S30: control circulating pump and open when water tank inlet temperature TI meets the 3rd preset temperature condition, with
And second time is closed when water tank inlet temperature TI meets the second preset temperature condition；And
Step S50: control circulating pump and open when the second time shut-in time meets the first Preset Time condition, Yi Ji
When meeting the second Preset Time condition, third time is closed, and the second Preset Time condition is that hot water is recycled to from water outlet of water tank
Time needed for farthest water spot.
By the technique scheme of the present embodiment, it is possible to achieve plug and play hot water, without cold water section, saving water resource；
And, the hot water circuit frequency adjusts automatically according to supply channel actual temperature change, it is achieved water pump neither leaves excessively frequently
Numerous, ensure that and use water spot hot water temperature, reduce power consumption, extend the water pump life-span；Meanwhile, hot water circuit realizes supplying
Water lines hot water, and water return pipeline cold water, reduce thermal loss, saves energy.
Fig. 2 is the flow chart of the concrete steps of the control method of hot water circuit according to embodiments of the present invention.
Referring specifically to shown in Fig. 2, step 101: open automatic hot-water circulatory function, water-heater water tank water inlet temperature
Temperature TI of sensor acquisition water tank upper water inlet pipe, temperature sensor distance water tank 5-15cm, when the current in pipeline
Time dynamic, the temperature in temperature sensor instruction pipeline, when the water in pipeline does not flows, the temperature of instruction water tank upper water
Degree；Temperature TU of water-heater water tank outlet temperature sensor acquisition water tank upper outlet pipe, by water-heater water tank water outlet
Mouth temperature sensor same distance water tank 5-15cm, when the water in pipeline flows, in temperature sensor instruction pipeline
Temperature, when the water in pipeline does not flows, the temperature of instruction water tank upper water.
Step 103: judge whether water-heater water tank outlet temperature TU is more than or equal to 45 degree, wherein, 45 degree are
The temperature preset, when water-heater water tank outlet temperature TU is more than 45 degree, performs step 105.
Step 105: ON cycle water pump.
Step 107: judge that whether circulation time is more than or equal to 60 seconds；Wherein, the time of 60 seconds is to ensure that when pipe
During water flowing in road, water-heater water tank water inlet temperature sensor no longer indicates the temperature of water tank upper, but pipeline
The temperature of middle water.
Step 109: when circulation time was more than or equal to 60 seconds, it is judged that water-heater water tank water inlet temperature TI is
No deduct 10 degree more than or equal to water-heater water tank outlet temperature TU, this is because: enter confession from tank hot water outlet
When the hot water return of water lines is to water tank cooling water inlet, TI will deduct 10 ° more than or equal to TU.
Step 111: when TI is more than or equal to (TU-10 °), stop water circulating pump.In this circulates, write down
Time t1, t1 represent from tank hot water's outlet to farthest water spot, return the circulation pipe of water tank cold water inlet
Road total length, circulation time i.e. represents length of the cycle.
Step 201: continue to judge that whether TI is less than or equal to 25 degree.This is because, when user uses, it is desirable to have
The tap water persistently filled into, when user uses hot water, what TI reflected is the temperature of tap water, and tap water may reach
To maximum temperature be 25 degree, when TI less than or equal to 25 ° time, illustrate that now user is currently in use hot water.
Step 113: when TI is not below or equal to 25 degree, illustrates that user is not using hot water, at this moment in pipeline
Water can turn cold, for ensure user use at any time time pipeline in have hot water, need to judge the time that water circulating pump stops
Whether more than or equal to preset value delta t0, Δ t0 value is (Te+50) min, if used in Δ t0=(Te+50) min
Family with water, does not then return step 105, ON cycle pump.Wherein, Te represents water-heater water tank ambient temperature.
Step 203: judge that TI, whether more than or equal to 30 degree, when TI is more than or equal to 30 degree, illustrates tap water
Feed-tank moisturizing, TI is affected by hot water temperature in water tank have been risen.
Step 205:TI is more than or equal to 30 degree, and water the temperature inside the box rises, and at this moment needs ON cycle pump.
Step 207: after circulating pump is opened, it is judged that whether TI is more than or equal to (TU-10 °).
When step 209:TI is more than or equal to (TU-10 °), close circulating pump.
In this circulates, write down t2, t2 and represent that to return to water tank cold water inlet circulation line from farthest water spot long
Degree, length of the cycle is circulation time.
Step 302: judge whether water circulating pump dwell time is more than or equal to Δ tn, wherein Δ tn is meant that farthest
The time needed with water spot water temperature drop to minimum permissible temperature, initial value Δ t1=Δ t0, Δ t0 value is
(Te+50)min。
Step 304: when water circulating pump dwell time is more than or equal to Δ tn, ON cycle pump.
Step 305: judge whether a (t1-t2) is less than or equal to (t1-30s), this is because the implication of a (t1-t2)
For in hot water circuit, hot water is the starting point position to farthest water spot a times from tank hot water's outlet, the preferred value of a
For 1-1.2；(t1-30s) implication is the position of hot water distance water tank cooling water inlet 30s in hot water circuit.
Step 307: if a (t1-t2) ＞ (t1-30s), continue to judge whether circulation time is more than or equal to (t1-30s),
And where it has, perform step 311: stop circulating pump.Or
Step 309: if a (t1-t2)≤(t1-30s), continue to judge whether circulation time is more than or equal to a (t1-t2),
And where it has, perform step 311: stop circulating pump.
Step 312: continue to judge whether the time that circulating pump stops is more than or equal to Δ t (n+1), and in a case of yes
Perform step 304.
By the technique scheme of the present embodiment, it can be seen that in the case of user does not use hot water, according to pipe
Temperature in road, controls circulating pump and automatically turns on and close, it is achieved plug and play, have hot water at any time；Meanwhile, root
Temperature value according to temperature sensor, it can be seen that whether user is using hot water, and the feelings whether used according to user
Under condition, automatically control circulating pump, meet the demand of user.Furthermore, it is achieved supply channel hot water, and water return pipeline is cold
Water, reduces thermal losses, saves the energy.
Fig. 3 is the primary structure schematic diagram controlling device of hot water circuit according to embodiments of the present invention.
Shown in Figure 3, the control device of the hot water circuit of the present invention includes: the first control module 30, is used for controlling
Circulating pump is opened when water outlet of water tank temperature TU meets the first preset temperature condition, and in water tank inlet temperature
TI closes when meeting the second preset temperature condition for the first time；
Second control module 32, is used for controlling circulating pump and meets the 3rd preset temperature condition in water tank inlet temperature TI
Shi Kaiqi, and second time is closed when water tank inlet temperature TI meets the second preset temperature condition；And
3rd control module 34, is used for controlling circulating pump and meets the first Preset Time condition in the second time shut-in time
Shi Kaiqi, and third time is closed when meeting the second Preset Time condition, the second Preset Time condition is hot water
Time needed for water outlet of water tank is recycled to farthest with water spot.
Alternatively, the first control module 30 includes: the first judge module, is used for judging that water outlet of water tank temperature TU is
No satisfied first preset temperature condition, and start circulating pump in a case of yes；And second judge module, it is used for sentencing
Whether disconnected circulating pump runs the 3rd Preset Time condition, and where it has, judges that water tank inlet temperature TI is
No satisfied second preset temperature condition, and where it has, close circulating pump for the first time.
Alternatively, the second control module 32 includes: the 3rd judge module, is used for judging that water tank inlet temperature TI is
No satisfied 3rd preset temperature condition, if so, ON cycle pump；And the 4th judge module, it is used for judging that water tank enters
Whether mouth of a river temperature TI meets in the second preset temperature condition, and if so, second time closes circulating pump.
Further, the 3rd control module 34 includes: the 5th judge module, is used for judging that circulating pump second time is closed
Whether the time meets the first Preset Time condition, if so, ON cycle pump；And the 6th judge module, it is used for judging
Whether the circulating pump opening time meets the second Preset Time condition, and if so, third time closes circulating pump.
According to technical scheme, contribute to automatically adjusting hot water cyclesystem according to the practical situation of water lines
Time interval, both met the effect of hot water circuit, reduced again energy loss.
Obviously, those skilled in the art should be understood that above-mentioned technical scheme, it can be seen that user
In the case of not using hot water, according to the temperature in pipeline, control circulating pump and automatically turn on and close, it is achieved i.e. open
I.e. use, has hot water at any time；Meanwhile, according to the temperature value of temperature sensor, it can be seen that whether user is using
Hot water, and in the case of whether using according to user, automatically control circulating pump, meet the demand of user.Furthermore, real
Existing supply channel hot water, and water return pipeline cold water, reduce thermal losses, save the energy.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the control method of a hot water circuit, it is characterised in that including:
Step S10: control circulating pump and meet first in water outlet of water tank temperature (TU)
Open during preset temperature condition, and it is pre-to meet second in water tank inlet temperature (TI)
If closing for the first time during temperature conditions；
Step S30: control described circulating pump full described water tank inlet temperature (TI)
Open during foot the 3rd preset temperature condition, and described water tank inlet temperature (TI)
When meeting described second preset temperature condition, second time is closed；And
Step S50: control described circulating pump and meet first in the described second time shut-in time
Open during Preset Time condition, and third time is closed when meeting the second Preset Time condition
Closing, described second Preset Time condition is that hot water is recycled to from described water outlet of water tank farthest
With the time needed for water spot.
Method the most according to claim 1, it is characterised in that described step S10 includes:
S100: judge whether described water outlet of water tank temperature (TU) meets described first
Preset temperature condition, and start described circulating pump in a case of yes；And
S102: judge whether described circulating pump runs the 3rd Preset Time condition, and be
In the case of, it is judged that whether described water tank inlet temperature (TI) meets described second pre-
If temperature conditions, and where it has, close described circulating pump for the first time.
Method the most according to claim 1, it is characterised in that after described step S10,
Described method also includes:
S20: judge whether described water tank inlet temperature (TI) meets the 4th and preset temperature
Degree condition, if so, performs described step S30, if it is not, judge described in described circulating pump
Whether the shut-in time meets the 4th Preset Time condition for the first time, and where it has,
Return and perform described step S10.
Method the most according to claim 1, it is characterised in that described step S30 includes:
Step S301: judge whether described water tank inlet temperature (TI) meets described
3rd preset temperature condition, if so, opens described circulating pump, wherein, described 3rd pre-
If temperature conditions value is tap water stops filling into the temperature of rear water box；And
Step S303: judge whether described water tank inlet temperature (TI) meets in institute
Stating the second preset temperature condition, if so, second time closes described circulating pump.
Method the most according to claim 1, it is characterised in that described step S50 includes:
Step S502: judge described in described circulating pump, whether the second time shut-in time meets
Described first Preset Time condition, if so, opens described circulating pump, wherein, described
One Preset Time condition is that the described second time shut-in time is more than or equal to Δ tn, initial value Δ
T1=Δ t0, wherein, the value of Δ t0 is that water-heater water tank ambient temperature Te is plus pre-
Permanent amount；And
Step S504: judge whether the described circulating pump opening time meets described second pre-
If time conditions, if so, third time closes described circulating pump.
Method the most according to claim 5, it is characterised in that after described step S504,
Described method also includes:
Judge that described third time shut-in time of described circulating pump is whether more than or equal to the
Five Preset Time conditions, and where it has, return and perform described step S502.
7. the control device of a hot water circuit, it is characterised in that including:
First control module (30), is used for controlling circulating pump in water outlet of water tank temperature
(TU) open when meeting the first preset temperature condition, and in water tank inlet temperature
(TI) close for the first time when meeting the second preset temperature condition；
Second control module (32), is used for controlling described circulating pump at described water tank water intake
Mouth temperature (TI) is opened when meeting the 3rd preset temperature condition, and enters at described water tank
When mouth of a river temperature (TI) meets described second preset temperature condition, second time is closed；And
3rd control module (34), is used for controlling described circulating pump and closes in described second time
The time of closing opens when meeting the first Preset Time condition, and at satisfied second Preset Time
During condition, third time is closed, and described second Preset Time condition is that hot water goes out from described water tank
The mouth of a river is recycled to use farthest the time needed for water spot.
Device the most according to claim 7, it is characterised in that described first control module (30)
Including:
First judge module, is used for whether judging described water outlet of water tank temperature (TU)
Meet described first preset temperature condition, and start described circulating pump in a case of yes；
And
Second judge module, is used for judging whether described circulating pump runs the 3rd Preset Time
Condition, and where it has, judge that described water tank inlet temperature (TI) is the fullest
The described second preset temperature condition of foot, and where it has, follow described in closing for the first time
Ring pump.
Device the most according to claim 7, it is characterised in that described second control module (32)
Including:
3rd judge module, is used for judging that described water tank inlet temperature (TI) is the fullest
The described 3rd preset temperature condition of foot, if so, opens described circulating pump, wherein, described
3rd preset temperature condition value is the temperature that tap water stops filling into rear water box；And
4th judge module, is used for judging that described water tank inlet temperature (TI) is the fullest
Foot is in described second preset temperature condition, and if so, second time closes described circulating pump.
Device the most according to claim 7, it is characterised in that described 3rd control module
(34) including:
5th judge module, is used for judging that described in described circulating pump, the second time shut-in time is
No meet described first Preset Time condition, if so, open described circulating pump, wherein,
Described first Preset Time condition is the described second time shut-in time to be more than or equal to Δ tn, rises
Initial value Δ t1=Δ t0, wherein, the value of Δ t0 is water-heater water tank ambient temperature
Te adds constant predetermined amount；And
6th judge module, is used for judging whether the described circulating pump opening time meets described
Second Preset Time condition, if so, third time closes described circulating pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110345956.1A CN102434911B (en) | 2011-08-30 | 2011-11-04 | control method and device for hot water circulation |
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| CN201110253289 | 2011-08-30 | ||
| CN201110253289.4 | 2011-08-30 | ||
| CN2011102532894 | 2011-08-30 | ||
| CN201110345956.1A CN102434911B (en) | 2011-08-30 | 2011-11-04 | control method and device for hot water circulation |
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| CN102434911A CN102434911A (en) | 2012-05-02 |
| CN102434911B true CN102434911B (en) | 2016-09-14 |
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| CN104296387A (en) * | 2013-07-19 | 2015-01-21 | 珠海格力电器股份有限公司 | Water heater control method and system |
| CN105222351A (en) * | 2014-06-19 | 2016-01-06 | 珠海格力电器股份有限公司 | Water heater |
| CN111457460B (en) * | 2020-05-18 | 2024-03-19 | 珠海格力电器股份有限公司 | Zero cold water heater system, control method thereof and computer readable storage medium |
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| JP2002031411A (en) * | 2000-07-18 | 2002-01-31 | Toto Ltd | Electric water-heating appliance |
| CN2541788Y (en) * | 2002-04-10 | 2003-03-26 | 聂为然 | Water saving device of water heater |
| CN201277716Y (en) * | 2008-08-15 | 2009-07-22 | 海尔集团公司 | Instant heating circulating device |
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