CN109916076A - A kind of water heater increase-volume thermostat - Google Patents
A kind of water heater increase-volume thermostat Download PDFInfo
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- CN109916076A CN109916076A CN201910226791.2A CN201910226791A CN109916076A CN 109916076 A CN109916076 A CN 109916076A CN 201910226791 A CN201910226791 A CN 201910226791A CN 109916076 A CN109916076 A CN 109916076A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 563
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- 238000000034 method Methods 0.000 claims description 10
- 238000005485 electric heating Methods 0.000 claims description 6
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Abstract
The invention discloses a kind of water heater increase-volume thermostats.The cold water inlet road is connected with connecting line, and the water return pipeline is connected with connecting line, and the electric heater is connect with water return pipeline, hot water effluent's pipeline respectively, is provided with back water pump on the water return pipeline；The constant-temperature water mixing valve includes valve body, motor, spool, cold water outlet, hot water mouth, water outlet are provided on the valve body, the cold water outlet is connect with cold water inlet road, the hot water mouth connect with hot water inlet pipe road, the water outlet is connect with electric heater, the spool is arranged in the cavity between cold water outlet and hot water mouth, and the spool is connected to motor, and the aperture and on-off of valve core rotation change cold water outlet, hot water mouth's water stream channel are driven by motor；The cold water inlet road, water return pipeline are provided with acquisition terminal in constant-temperature water mixing valve, and the acquisition terminal, back water pump, motor, electric heater are connect by route with controller.
Description
Technical field:
The invention belongs to electric heater technical field, in particular to a kind of water heater increase-volume thermostat.
Background technique:
Electric heater refers to using various heaters, such as heating wire, electric heating tube, PTC heater, quartzy resistive film heating
The electric equipment products that pipe, ceramic heating pipe etc. heat water, heating method mainly have three kinds of heat storage type, fast heating type and quick-heating type etc.
Mode.Traditional heat storage electric water heater has power small, the big advantage of heat accumulation water, but there is volumes big, heating speed
Slowly, electrothermal tube is easily damaged, and constant temperature user does not mix the disadvantages of water is difficult for water outlet.Fast-type electric water heater product because its is small in size,
Energy conservation, it is comfortable, go out the advantages of hot water at any time in the commercially available quick development of China's water heater, but due to high-power disadvantage
Cause many old houses that can not install since power supply service wire carrying current capacity is insufficient.Fast heating type is to reduce heat storage water tank
To 10-30 liter, heating power is increased to 3-5.5KW, and such water tank preheating time is shorter than heat accumulation, but causes energy storage insufficient,
Hot water effluent's amount is obvious insufficient.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention:
The purpose of the present invention is to provide a kind of water heater increase-volume thermostats, to overcome above-mentioned in the prior art scarce
It falls into.
To achieve the above object, the present invention provides a kind of water heater increase-volume thermostats, comprising: cold water inlet road,
Hot water inlet pipe road, hot water effluent's pipeline, water return pipeline, connecting line, constant-temperature water mixing valve, electric heater, back water pump, acquisition are eventually
End, controller；The cold water inlet road is connected with connecting line, and the water return pipeline is connected with connecting line, and the electricity adds
Hot device is connect with water return pipeline, hot water effluent's pipeline respectively, and back water pump, the hot water outlet pipe are provided on the water return pipeline
Road is connect with outlet valve；The constant-temperature water mixing valve includes valve body, motor, spool, and cold water outlet, hot water are provided on the valve body
Mouth, water outlet, the cold water outlet are connect with cold water inlet road, and the hot water mouth connect with hot water inlet pipe road, the water outlet
Mouth is connect with electric heater, and the spool is arranged in the cavity between cold water outlet and hot water mouth, and the spool is connected to motor, and is led to
Opening size and on-off that motor drives valve core rotation to change cold water outlet, hot water mouth are crossed, to adjust the mixing of hot water and cold water
Ratio, the temperature of regulating mixed water valve water outlet；The cold water inlet road, water return pipeline are provided in constant-temperature water mixing valve and adopt
Collect terminal, the acquisition terminal, back water pump, motor, electric heater are connect by route with controller.
Preferably, in technical solution, water heater increase-volume thermostat passes through hot water inlet pipe road, connecting line and external storage
Water tank connection, external water tank, hot water inlet pipe road, constant-temperature water mixing valve, electric heater, water return pipeline, connecting line form pre-
Hot water channels；Cold water inlet road, connecting line, external water tank, hot water inlet pipe road, constant-temperature water mixing valve, electric heater, hot water
Outlet pipeline forms constant temperature water channel.
Preferably, in technical solution, motor can be stepper motor or direct current generator；Spool is ceramic cartridge.
Preferably, in technical solution, cold water inlet road water inlet end, connecting line cold water upstream end, water return pipeline water outlet
End is respectively arranged with check valve, prevents flow reversal from flowing.
Preferably, in technical solution, acquisition terminal includes flow sensor, external water tank temperature sensor, mixed water temperature
Sensor, leaving water temperature sensors are spent, the flow sensor is arranged in cold water inlet road water inlet end, the external water tank
Temperature sensor is arranged at the hot water mouth of constant-temperature water mixing valve, and the water outlet of constant-temperature water mixing valve is arranged in the water-mixing temperature sensor
At mouthful, the leaving water temperature sensors are arranged in electric heater water outlet；It is described to include flow sensor, external water tank temperature biography
Sensor, water-mixing temperature sensor, leaving water temperature sensors are connect by route with controller.
Preferably, in technical solution, timer is provided in controller, for controlling the opening and closing of back water pump.
Preferably, in technical solution, temperature detect switch (TDS) is provided on electric heater, temperature detect switch (TDS) passes through the electricity of route and device
The connection of source line.
Preferably, in technical solution, cold water inlet road is provided with relief valve.
Preferably, in technical solution, external water tank selects unitary structure or double-bladder type structure.
A kind of working method of water heater increase-volume thermostat, including speed heat mode and i.e. heat pattern；Wherein speed heat mode
The step of are as follows:
(1) water tank preheating temperature T is arranged in controller4, T4=40-75 DEG C, leaving water temperature T is set5, T5=30-50 DEG C；
(2) outlet valve is closed, and timer sets timing C, as C > 0, closes back water pump, it is permanent to adjust motor control
The valve core rotation of warm water mixing valve, hot water mouth open, and cold water outlet is closed, and controller maintains keeping warm mode；As C=0, controller is opened
Dynamic back water pump, is preheated；
(3) water flow enters constant temperature water mixing valve body, external water storage by hot water inlet pipe road, hot water mouth from external water tank
Case temperature sensor acquires external water inlet temperature of water storage tank data T1, and it is transferred to controller；
(4) controller receives T1, work as T4-T1At 5 DEG C of <, controller closes back water pump, into keeping warm mode；It controls simultaneously
Device is according to (T4-T1) value resetting C value, as (T4-T1When)≤0 DEG C, C=60 minutes；As 0 DEG C of < (T4-T1) 5 DEG C of < when, C=
12×(T4-T1) minute；
(5) work as T4-T1At >=5 DEG C, controller starts electric heater, and water flow is introduced electric heater from water outlet by back water pump
Heating, water flow temperature T when water flow flows out electric heater, after leaving water temperature sensors acquisition heating2, by adjusting electric heater
Power, keep T2=T4, the water flow after heating enters water return pipeline, and is pumped into connecting line by back water pump and returns to external water storage
Case；Work as T1< T4When, circulating-heating is carried out to water flow；Work as T1≥T4When, controller is closed electric heater and is turned off after 5s
Back water pump；
(6) outlet valve is opened, user uses hot water；
I.e. heat pattern the step of are as follows:
(1) leaving water temperature T is arranged in controller5, T5=30-50 DEG C；
(2) when outlet valve is closed, external water tank is without preheating；
(3) after outlet valve is opened, cold water a part in cold water inlet road through connecting line enter external water tank with
Warm water mixing in water tank, and enter constant temperature water mixing valve body from hot water inlet pipe road through hot water mouth, in cold water inlet road
Another part cold water is directly entered constant temperature water mixing valve body through cold water outlet, after two parts water flow mixes in constant temperature water mixing valve body
Electric heater is flowed into from water outlet；
(4) the temperature T of water-mixing temperature sensor acquisition constant-temperature water mixing valve water outlet water flow3, leaving water temperature sensors acquisition
Water flow temperature T after electric heating2；Controller is by adjusting electric heater capacity output valve, it is ensured that T2=T5；Flow sensor is adopted
Collect cold water flow Q in cold water inlet road, then initial output power P=K × Q × (T of electric heater5-T3), wherein K is normal
Number；According to T2With T5Comparing result adjusts the instant output power of electric heater, by fuzzy PID control method to keep being discharged
Temperature is invariable；
(5) it after the completion of water flow heats in electric heater, into hot water effluent's pipeline, is discharged from outlet valve, user uses
Hot water.
Preferably, in technical solution, in speed heat mode, after step (6), flow direction and the step in i.e. heat pattern
(3) identical, external water tank temperature sensor acquires external water inlet temperature of water storage tank data T1, water-mixing temperature sensor acquisition perseverance
The temperature T of warm water mixing valve water outlet water flow3, flow sensor acquire cold water inlet road in cold water flow Q；Controller is according to T5、
Q, the rated power P of electric heater1Calculate the mixed water target temperature T of constant-temperature water mixing valve water outlet6, T6It is true by following algorithm
It is fixed: T6=T5-P1/ Q/70, and by motor regulating thermostatic water mixing valve spool, make T3=T6, at this moment stop motor work, keep permanent
The aperture of warm water mixing valve；Next step is identical as step (4) in i.e. heat pattern.
Compared with prior art, the invention has the following beneficial effects:
After increasing the device, water heater provides effluent temperature constancy, not with water flow, supply voltage, enters coolant-temperature gage etc. and becomes
Change and changes；Due to using circulating-heating, tank hot water's temperature is uniform, and the accumulator tank energy storage than same volume increases
20%.Due to being that heat pattern still can provide 40 DEG C of hot water with supplementary heating, when even if water tank temperature is down to 20 DEG C, in this way
The hot water delivery rate of water tank can be significantly improved.After the device, water heater hot-water water rate is comprehensive to improve 100-400%.
In the case where identical hot water effluent's amount, using preheating temperature can be significantly reduced after the device, such water tank preheating time is significantly
Shorten, the thermal loss of hot water reduces on year-on-year basis, and product is more energy saving compared to heat-storage water heater.It can when inflow temperature is greater than 25 DEG C
It is thermal technology's operation mode with selection, at this moment water tank does not need to preheat, and energy-saving effect is more significant.Due to using circulating-heating, hot water
Steam significantly reduces, and the pressure of water tank significantly reduces, and avoids traditional storage-type and fast heating type water tank showing due to steam pressure
Writing variation feed-tank brings deformation to lead to radiator leak, can significantly extend the water tank service life.It is warm using being preheated after the device
Degree can be reduced to 50 DEG C hereinafter, such can be significantly reduced water tank scale velocity, extension water tank service life.The water heater increase-volume is permanent
Warm rating of set is designed as 3-5.5KW, is able to satisfy the power requirement of most users.Heat storage type heat can be substituted with complete upgrading
Hydrophone product.
Detailed description of the invention:
Fig. 1 is water heater increase-volume thermostat structural schematic diagram of the present invention；
Fig. 2 is controller architecture functional block diagram of the present invention；
Fig. 3 is warm flow direction schematic diagram of the present invention；
Fig. 4 is exiting water process flow direction schematic diagram of the present invention；
Main appended drawing reference explanation:
1- cold water inlet road, 2- hot water inlet pipe road, 3- hot water effluent pipeline, 4- water return pipeline, 5- connecting line, 6-
Constant-temperature water mixing valve, 7- electric heater, 8- back water pump, 9- controller, 10- valve body, 11- motor, 12- spool, 13- cold water outlet, 14-
Hot water mouth, 15- water outlet, 16- check valve, 17- check valve, 18- check valve, 19- flow sensor, the external water storage box temperature of 20-
Spend sensor, 21- water-mixing temperature sensor, 22- leaving water temperature sensors, 23- temperature detect switch (TDS), 24- relief valve, the external storage of 25-
Water tank, 26- timer.
Specific embodiment:
Specific embodiments of the present invention will be described in detail below, it is to be understood that protection scope of the present invention is not
It is restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figs. 1-2, a kind of water heater increase-volume thermostat, comprising: cold water inlet road 1, hot water inlet pipe road 2,
Hot water effluent's pipeline 3, water return pipeline 4, connecting line 5, constant-temperature water mixing valve 6, electric heater 7, back water pump 8, acquisition terminal, control
Device 9；The cold water inlet road 1 is connected with connecting line 5, and the water return pipeline 4 is connected with connecting line 5, the electric heating
Device 7 is connect with water return pipeline 4, hot water effluent's pipeline 3 respectively, and back water pump 8 is provided on the water return pipeline 4, and the hot water goes out
Water lines 3 are connect with outlet valve；The back water pump 8, motor 11, electric heater 7 are connect by route with controller 9.
The constant-temperature water mixing valve 6 includes valve body 10, motor 11, spool 12, and cold water outlet 13, heat are provided on the valve body 10
The mouth of a river 14, water outlet 15, the cold water outlet 13 are connect with cold water inlet road 1, and the hot water mouth 14 connects with hot water inlet pipe road 2
It connects, the water outlet 15 is connect with electric heater 7, and the cavity between cold water outlet 13 and hot water mouth 14 is arranged in the spool 12
Interior, the spool 12 is connect with motor 11, and the on-off for changing cold water outlet 13, hot water mouth 14 is rotated by spool 12；
The cold water inlet road 1, water return pipeline 4 are provided with acquisition terminal in constant-temperature water mixing valve 6, and the acquisition is eventually
End includes flow sensor 19, external water tank temperature sensor 20, water-mixing temperature sensor 21, leaving water temperature sensors 22,
The setting of flow sensor 19 is arranged in 1 water inlet end of cold water inlet road, the external water tank temperature sensor 20 in heat
At the mouth of a river 14, the water-mixing temperature sensor 21 is arranged at water outlet 15, and the setting of leaving water temperature sensors 22 adds in electricity
Hot 7 water outlet of device；It is described to include flow sensor 19, external water tank temperature sensor 20, water-mixing temperature sensor 21, go out water temperature
Degree sensor 22 is connect by route with controller 9.
Water heater increase-volume thermostat is connect by hot water inlet pipe road 2, connecting line 5 with external water tank 25, external
Water tank 25, hot water inlet pipe road 2, constant-temperature water mixing valve 6, electric heater 7, water return pipeline 4, connecting line 5 form preheating water channel；
Cold water inlet road 1, connecting line 5, external water tank 25, hot water inlet pipe road 2, constant-temperature water mixing valve 6, electric heater 7, hot water
Outlet pipeline 3 forms constant-temperature effluent water channel.
1 water inlet end of cold water inlet road, 5 cold water upstream end of connecting line, 4 water outlet of water return pipeline are respectively arranged with unidirectionally
Valve 16,17,18, prevents flow reversal from flowing.
Timer 26 is provided in controller 9, for controlling the opening and closing of back water pump 8.
Temperature detect switch (TDS) 23 is provided on electric heater 7, temperature detect switch (TDS) 23 is connect by route with controller 9.
Relief valve 24 is provided on cold water inlet road 1.
External water tank 25 selects unitary structure or double-bladder type structure.
As shown in figure 3, a kind of the step of speed heat mode of water heater increase-volume thermostat are as follows:
(1) water tank preheating temperature T is arranged in controller4, T4=40-75 DEG C, leaving water temperature T is set5, T5=30-50 DEG C；
(2) outlet valve is closed, and timer sets timing C, as C > 0, closes back water pump, it is permanent to adjust motor control
The valve core rotation of warm water mixing valve, hot water mouth open, and cold water outlet is closed, and controller maintains keeping warm mode；As C=0, controller is opened
Dynamic back water pump, is preheated；
(3) water flow enters constant temperature water mixing valve body, external water storage by hot water inlet pipe road, hot water mouth from external water tank
Case temperature sensor acquires external water inlet temperature of water storage tank data T1, and it is transferred to controller；
(4) controller receives T1, work as T4-T1At 5 DEG C of <, controller closes back water pump, into keeping warm mode；It controls simultaneously
Device is according to (T4-T1) value resetting C value, as (T4-T1When)≤0 DEG C, C=60 minutes；As 0 DEG C of < (T4-T1) 5 DEG C of < when, C=
12×(T4-T1) minute；
(5) work as T4-T1At >=5 DEG C, controller starts electric heater, and water flow is introduced electric heater from water outlet by back water pump
Heating, water flow temperature T when water flow flows out electric heater, after leaving water temperature sensors acquisition heating2, by adjusting electric heater
Power, keep T2=T4, the water flow after heating enters water return pipeline, and is pumped into connecting line by back water pump and returns to external water storage
Case；Work as T1< T4When, circulating-heating is carried out to water flow；Work as T1≥T4When, controller is closed electric heater and is turned off after 5s
Back water pump；
(6) outlet valve is opened, user uses hot water；
(7) warm water that cold water a part in cold water inlet road enters in external water tank and water tank through connecting line mixes
It closes, tank hot water enters constant temperature water mixing valve body through hot water mouth from hot water inlet pipe road, another part in cold water inlet road
Cold water is directly entered constant temperature water mixing valve body through cold water outlet, two parts water flow mixed in constant temperature water mixing valve body after from water outlet
Flow into electric heater；
(8) external water tank temperature sensor acquires external water inlet temperature of water storage tank data T1, water-mixing temperature sensor adopts
Collect the temperature T of constant-temperature water mixing valve water outlet water flow3, flow sensor acquire cold water inlet road in cold water flow Q；Controller root
According to T5, Q, electric heater rated power P1Calculate the mixed water target temperature T of constant-temperature water mixing valve water outlet6, T6Pass through following calculation
Method determines: T6=T5-P1/ Q/70, and by motor regulating thermostatic water mixing valve spool, make T3=T6, at this moment stop motor work, protect
Hold the aperture of constant-temperature water mixing valve；
(9) the temperature T of water-mixing temperature sensor acquisition constant-temperature water mixing valve water outlet water flow3, leaving water temperature sensors acquisition
Water flow temperature T after electric heating2；Controller is by adjusting electric heater capacity output valve, it is ensured that T2=T5；Flow sensor is adopted
Collect cold water flow Q in cold water inlet road, then initial output power P=K × Q × (T of electric heater5-T3), wherein K is normal
Number；According to T2With T5Comparing result adjusts the instant output power of electric heater, by fuzzy PID control method to keep being discharged
Temperature is invariable；
(10) it after the completion of water flow heats in electric heater, into hot water effluent's pipeline, is discharged from outlet valve, user uses
Hot water.
As shown in figure 4, i.e. heat pattern the step of are as follows:
(1) leaving water temperature T is arranged in controller5, T5=30-50 DEG C；
(2) when outlet valve is closed, external water tank is without preheating；
(3) after outlet valve is opened, cold water a part in cold water inlet road through connecting line enter external water tank with
Warm water mixing in water tank, and enter constant temperature water mixing valve body from hot water inlet pipe road through hot water mouth, in cold water inlet road
Another part cold water is directly entered constant temperature water mixing valve body through cold water outlet, after two parts water flow mixes in constant temperature water mixing valve body
Electric heater is flowed into from water outlet；
(4) the temperature T of water-mixing temperature sensor acquisition constant-temperature water mixing valve water outlet water flow3, leaving water temperature sensors acquisition
Water flow temperature T after electric heating2；Controller is by adjusting electric heater capacity output valve, it is ensured that T2=T5；Flow sensor is adopted
Collect cold water flow Q in cold water inlet road, then initial output power P=K × Q × (T of electric heater5-T3), wherein K is normal
Number；According to T2With T5Comparing result adjusts the instant output power of electric heater, by fuzzy PID control method to keep being discharged
Temperature is invariable；
(5) it after the completion of water flow heats in electric heater, into hot water effluent's pipeline, is discharged from outlet valve, user uses
Hot water.
After increasing the device, water heater provides effluent temperature constancy, not with water flow, supply voltage, enters coolant-temperature gage etc. and becomes
Change and changes；Due to using circulating-heating, tank hot water's temperature is uniform, and the accumulator tank energy storage than same volume increases
20%.
Due to be heat pattern can with supplementary heating, even if water tank temperature down to 20 DEG C it is former 40 DEG C of hot water can be so provided,
The hot water delivery rate of water tank can be significantly improved in this way.After the device, water heater hot-water water rate is comprehensive to improve 100-
400%.In the case where identical hot water effluent amount, using preheating temperature can be significantly reduced after the device, when such water tank preheats
Between greatly shorten, the thermal loss of hot water reduces on year-on-year basis, product compared to heat-storage water heater it is more energy saving.It is greater than 25 in inflow temperature
DEG C when can choose i.e. thermal technology's operation mode, at this moment water tank does not need to preheat, and energy-saving effect is more significant.
Due to using circulating-heating, hot water and steam is significantly reduced, and the pressure of water tank significantly reduces, and avoids traditional storage-type
With fast heating type water tank since the significant changes feed-tank of steam pressure brings deformation to lead to radiator leak, can significantly extend
The water tank service life.50 DEG C can be reduced to hereinafter, water tank scale velocity can be significantly reduced in this way using preheating temperature after the device,
Extend the water tank service life.The water heater power designs are 3-5.5KW, are able to satisfy the power requirement of most users.It can be comprehensive
Substitute heat storage water heater product.
Hot water effluent's amount of heat-storage water heater and hot water effluent's amount after the increase present apparatus are done into a theory analysis below
Compare.
Assuming that entering coolant-temperature gage (water tank water intake temperature) T1(DEG C), leaving water temperature T2(DEG C), water tank preheating temperature T4(DEG C), if
Set leaving water temperature T5(DEG C), hot water flow are Q (liter/min), i.e., hot heater power is P1(W), preheating water tank's heater power P2
(W), the volume V (liter) of preheating water tank, tank hot water's water rate α=80%, i.e. hot heater power utilization β=95% are used
Family manually adjusts mixed hydro-thermal water use efficiency γ=95%, continues supplying hot water time t_hot (minute), and hot water effluent's amount is V1It rises.
Formula is 1.: preheating time (minute) t1=(T4-T1)×V×70/P1
Formula is 2.: before increasing the present apparatus, the minimum hot water temperature T of water tank7=water outlet setting temperature T5
Formula is 3.: before increasing the present apparatus, heat-storage water heater continues the supplying hot water time are as follows:
T_hot=70 × 2 × V × α × γ/(70 × (T5-T1)×Q)+70×(T4-2-T5)×V×α×γ/(70×
(T5-T1)×Q-P2)
V1=t_hot*Q
Formula is 4.: after increasing the present apparatus, T7=T5-P2/Q/70
Formula is 5.: after increasing the present apparatus, water heater continues the supplying hot water time are as follows:
T_hot=70 × (T4-T7)×V×α/(70×(T5-T1)×Q-P1×β)
V1=t_hot × Q
Following table gives hot water effluent's amount and ratio under different conditions
Storage-type electric water heater increases effect comparison sheet 1 after hot water increase-volume thermostat
Upper table statistics indicate that, when entering the variation such as coolant-temperature gage, flow, water tank preheating temperature, hot water effluent measure generate it is related
Change, as can be seen that being set under fixed condition in table in upper table, increases the present apparatus and do not increase the ratio of present apparatus hot water effluent amount
Value changes from 1.6-12.5.Under the common use condition of user: 5-20 DEG C of inflow temperature, 4-8 liters/min of flow, hot water goes out
The ratio range of water is 1.6-4.0.Above data can illustrate that the hot water compatibilization effect of the device is very significant.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (11)
1. a kind of water heater increase-volume thermostat, it is characterised in that: go out including cold water inlet road, hot water inlet pipe road, hot water
Water lines, water return pipeline, connecting line, constant-temperature water mixing valve, electric heater, back water pump, controller；The cold water inlet road with
Connecting line be connected, the water return pipeline is connected with connecting line, the electric heater respectively with water return pipeline, hot water outlet pipe
Road connects, and is provided with back water pump on the water return pipeline；The constant-temperature water mixing valve respectively with cold water inlet road, hot water inlet pipe
Road, electric heater connection；The controller passes through route respectively and connect with back water pump, constant-temperature water mixing valve, electric heater, and control is permanent
Warm water mixing valve water-mixing temperature adjusts electric heater heating efficiency.
2. water heater increase-volume thermostat according to claim 1, it is characterised in that: the water heater increase-volume thermostat
Connect by hot water inlet pipe road, connecting line with external water tank, external water tank, hot water inlet pipe road, constant-temperature water mixing valve,
Electric heater, water return pipeline, connecting line form preheating water channel；Cold water inlet road, connecting line, external water tank, hot water
Inlet pipeline, constant-temperature water mixing valve, electric heater, hot water effluent's pipeline form constant-temperature effluent water channel.
3. water heater increase-volume thermostat according to claim 2, it is characterised in that: the constant-temperature water mixing valve includes valve
Body, motor, spool；Cold water outlet, hot water mouth, water outlet are provided on the valve body, the cold water outlet and cold water inlet road connect
It connects, the hot water mouth connect with hot water inlet pipe road, and the water outlet is connect with electric heater, and the spool is arranged in cold water outlet
In cavity between hot water mouth, the spool is connected to motor, and drives valve core rotation to change cold water outlet, hot water mouth by motor
The aperture and on-off of water stream channel.
4. water heater increase-volume thermostat according to claim 3, it is characterised in that: the cold water inlet road, return water
Acquisition terminal is provided in pipeline, constant-temperature water mixing valve, the acquisition terminal includes flow sensor, external water tank temperature biography
Sensor, water-mixing temperature sensor, leaving water temperature sensors, the flow sensor are arranged in cold water inlet road water inlet end, institute
External water tank temperature sensor is stated to be arranged hot water mouth at, the water-mixing temperature sensor setting in water outlet, it is described out
Water temperature sensor is arranged in electric heater water outlet；The flow sensor, external water tank temperature sensor, water-mixing temperature
Sensor, leaving water temperature sensors are connect by route with controller.
5. water heater increase-volume thermostat according to claim 4, it is characterised in that: the cold water inlet road water inlet
End, connecting line cold water upstream end, water return pipeline water outlet are respectively arranged with check valve.
6. water heater increase-volume thermostat according to claim 5, it is characterised in that: be provided with timing in the controller
Device.
7. water heater increase-volume thermostat according to claim 5, it is characterised in that: be provided with temperature on the electric heater
Control switch.
8. water heater increase-volume thermostat according to claim 5, it is characterised in that: the cold water inlet road is arranged
There is relief valve.
9. the water heater increase-volume thermostat according to any one of claim 2-8, it is characterised in that: external water tank choosing
With unitary structure or double-bladder type structure.
10. a kind of working method of water heater increase-volume thermostat according to claim 6, including speed heat mode and i.e. heat
Mode；Wherein the step of speed heat mode are as follows:
(1) water tank preheating temperature T is arranged in controller4, T4=40-75 DEG C, leaving water temperature T is set5, T5=30-50 DEG C；
(2) outlet valve is closed, and timer sets timing C, as C > 0, closes back water pump, it is mixed to adjust motor control constant temperature
The valve core rotation of water valve, hot water mouth open, and cold water outlet is closed, and controller maintains keeping warm mode；As C=0, controller starts back
Water pump is preheated；
(3) water flow enters constant temperature water mixing valve body, external water storage box temperature by hot water inlet pipe road, hot water mouth from external water tank
It spends sensor and acquires external water inlet temperature of water storage tank data T1, and it is transferred to controller；
(4) controller receives T1, work as T4-T1At 5 DEG C of <, controller closes back water pump, into keeping warm mode；Controller root simultaneously
According to (T4-T1) value resetting C value, as (T4-T1When)≤0 DEG C, C=60 minutes；As 0 DEG C of < (T4-T1) 5 DEG C of < when, C=12 ×
(T4-T1) minute；
(5) work as T4-T1At >=5 DEG C, controller starts electric heater, and water flow is introduced electric heater from water outlet and heated by back water pump,
Water flow temperature T when water flow flows out electric heater, after leaving water temperature sensors acquisition heating2, by the function for adjusting electric heater
Rate keeps T2=T4, the water flow after heating enters water return pipeline, and is pumped into connecting line by back water pump and returns to external water tank；When
T1< T4When, circulating-heating is carried out to water flow；Work as T1≥T4When, controller closes electric heater and turns off return water after 5s
Pump；
(6) outlet valve is opened, user uses hot water；
I.e. heat pattern the step of are as follows:
(1) leaving water temperature T is arranged in controller5, T5=30-50 DEG C；
(2) when outlet valve is closed, external water tank is without preheating；
(3) after outlet valve is opened, cold water a part in cold water inlet road enters external water tank and water tank through connecting line
Interior warm water mixing, and enter constant temperature water mixing valve body from hot water inlet pipe road through hot water mouth, it is another in cold water inlet road
Portion of cold water is directly entered constant temperature water mixing valve body through cold water outlet, two parts water flow mixed in constant temperature water mixing valve body after from going out
The mouth of a river flows into electric heater；
(4) the temperature T of water-mixing temperature sensor acquisition constant-temperature water mixing valve water outlet water flow3, leaving water temperature sensors acquisition electric heating
Water flow temperature T afterwards2；Controller is by adjusting electric heater capacity output valve, it is ensured that T2=T5；Flow sensor acquires cold water
Cold water flow Q in inlet pipeline, then initial output power P=K × Q × (T of electric heater5-T3), wherein K is constant；According to
T2With T5Comparing result adjusts the instant output power of electric heater by fuzzy PID control method, to keep leaving water temperature permanent
It is fixed constant；
(5) it after the completion of water flow heats in electric heater, into hot water effluent's pipeline, is discharged from outlet valve, user uses hot water.
11. the working method of water heater increase-volume thermostat according to claim 10, it is characterised in that: speed heat mode
In, after step (6), flow direction is identical as step (3) in i.e. heat pattern, and external water tank temperature sensor acquisition is external
Water inlet temperature of water storage tank data T1, the temperature T of water-mixing temperature sensor acquisition constant-temperature water mixing valve water outlet water flow3, flow sensor
Acquire cold water flow Q in cold water inlet road；Controller is according to T5, Q, electric heater rated power P1Calculate constant temperature water mixing
The mixed water target temperature T of valve water outlet6, T6It is determined by following algorithm: T6=T5-P1/ Q/70, and it is mixed by motor regulating thermostatic
Inner part of water valve makes T3=T6, at this moment stop motor work, keep the aperture of constant-temperature water mixing valve；In next step and i.e. heat pattern
Step (4) is identical.
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