CN107192136A - A kind of water saving and temperature-fixing water outlet and control method based on water heater - Google Patents

Abstract

The invention discloses a water heater-based water-saving and temperature-fixed water outlet device and a control method. The device includes a water tank and a controller. The water tank is provided with a temperature sensor and a water level sensor. The water tank is connected with an input pipe, an output pipe and an air pipe. The controller is set on the surface of the water tank. The controller includes a display screen and a water temperature adjustment button. One end of the input pipe is connected with a three-way valve, and the output pipe is provided with a water outlet valve. The three-way valve is respectively connected to the cold water input pipe and the hot water input pipe. The port is provided with a solenoid air valve. The advantage of the present invention is that it uses the water storage tank to temporarily store cold water or premix the hot and cold water, and realizes no waste of water resources in the water heater without changing the water habits of residents. The series design of the size of the device and the mode switching between a single large amount of water and multiple small amounts of water can effectively improve its scope of application and reflect the humanized design.

Description

A water heater-based water-saving and constant temperature water outlet device and control method

technical field

The invention relates to the technical field of water temperature adjustment for water heaters, in particular to a water heater-based water-saving and temperature-fixed water outlet device and a control method.

Background technique

In recent years, with the improvement of people's living standards, the water heater market has developed rapidly. According to statistics from the National Bureau of Statistics of China, the number of water heaters per 100 households in China was 71.6 in 2016, an increase of 7.1%. In 2015, the annual sales volume of the domestic water heater market reached 31 million units, a year-on-year increase of 4.5%; in 2016, the overall market size of water heaters exceeded 38 million units; in 2017, the retail sales volume of the water heater market is expected to reach 40.33 million units. However, before the water heater normally produces hot water, the residual water remaining in the hot water pipeline and the cold water that has not reached the set temperature cannot be used normally, thus causing the user to wait for a long time for hot water. In addition, according to a large number of survey data, 91% of users will choose to waste the cold water.

At present, the water-saving auxiliary water outlet methods of water heaters on the market are mainly divided into the following two types: the pipe emptying water outlet method, through the pipe emptying valve to empty the cold water in the vertical or inclined downward part of the solar water heater to avoid cold water. The purpose of stagnation and pipeline freezing and cracking; the circulating pump return water outlet method ensures constant temperature outlet water through the circulating hot water pipeline. Among the above methods, the pipeline emptying type cannot drain the invalid cold water in the horizontal pipeline, and is only suitable for solar water heaters, so its application range is limited; the circulating pump in the circulating pump backwater type continues to work, consumes a lot of power, and the pipeline changes greatly , not suitable for ordinary home users.

Contents of the invention

The purpose of the present invention is to address the shortcomings of the existing devices, to provide a water heater-based water-saving and constant temperature water outlet device and control method, which is conducive to reducing waste of water resources and energy consumption, and promotes the development of the water heater industry in the direction of energy saving and environmental protection; The water safety and comfort of residents can also be guaranteed, and the awareness of water saving can be raised in a guided manner; in addition, the device has a simple structure, low cost, high universality, and is easy to be popularized and applied in the market.

In order to achieve the above object, the present invention relates to a water heater-based water-saving and constant temperature water outlet device and control method, the device includes a water tank and a controller, the water tank is provided with a temperature sensor and a water level sensor, and the water tank is connected to There are input pipes, output pipes and air pipes. The controller is set on the surface of the water tank. The controller includes a display screen and a water temperature adjustment button. One end of the input pipe is connected with a three-way valve, and the output pipe is provided with a water outlet valve. , the three-way valve is respectively connected to the cold water input pipe and the hot water input pipe, and the port of the air pipe is provided with an electromagnetic air valve; the water temperature adjustment button, the temperature sensor and the water level sensor are respectively communicated with the input end of the controller. The output end of the controller communicates with the water outlet valve, the three-way valve and the electromagnetic air valve.

Further, the controller includes a single-chip microcomputer, the input end of the single-chip microcomputer includes a water temperature detection unit, a water level detection unit and a temperature setting unit, the output end of the single-chip microcomputer includes a relay module and an intelligent water mixing module, and the water temperature detection unit It is connected with the temperature sensor, the water level detection unit is connected with the water level sensor, the temperature setting unit is connected with the water temperature adjustment button, the relay module is connected with the electromagnetic air valve, and the intelligent water mixing module is connected with the water outlet valve and the tee respectively. valve connected.

Furthermore, a booster pump is also provided on the output pipe, and the relay module communicates with the electromagnetic air valve and the booster pump respectively.

Further, the temperature sensor is arranged at the bottom of the water tank, the input pipe and the output pipe are also arranged at the bottom of the water tank, and the air pipe is arranged at the top of the water tank.

Further, the water level sensor is an ultrasonic ranging sensor, and the water level sensor is arranged on the top of the water tank.

Its control method comprises the following steps:

Step 1: Premixing stage:

The controller controls the water in the cold water input pipe and the hot water input pipe to enter the water tank for pre-mixing. The controller controls the three-way valve to close and prompts the user to open the water outlet valve. The pre-mixing stage is over and enter step 2;

Step 2: Out of water stage:

The water outlet stage is divided into a single large water consumption mode and a multiple small water consumption mode according to different usage conditions, such as different usage modes in different occasions such as bathrooms and kitchens.

Further, said step 1 includes the following steps:

Step 1.1: The user sets the temperature gear T as required through the water temperature adjustment button;

Step 1.2: The single-chip microcomputer controls the relay module to open the electromagnetic air valve, and at the same time controls the intelligent water mixing module to open the three-way valve to fully open the hot water input pipe; realize the pressurization of warm water in the box and improve the bathing comfort;

Step 1.3: When t<T, the cold water retained in the hot water input pipe and the hot water in the hot water input pipe enter the water tank successively for pre-mixing until the water temperature t reaches T; when t>T, the single-chip microcomputer controls the intelligent water mixing module Open the three-way valve to fully open the cold water input pipe and close the hot water input pipe until the water temperature t reaches T;

Step 1.4: The single-chip microcomputer controls the intelligent water mixing module to close the three-way valve and open the water valve, and prompt the user to open the water outlet valve through the display screen.

Further, the single large water consumption mode in the step 2 includes the following steps:

Step 2.1a: Before the liquid level of the water in the water tank reaches the water level line, the water level keeps dropping, and the single-chip microcomputer controls the relay module to turn on the booster pump;

Step 2.2a: When the liquid level of the water in the water tank reaches the water level line, the single-chip microcomputer controls the relay module to close the electromagnetic air valve and the booster pump;

Step 2.3a: Input the single-chip microcomputer through the water temperature detection unit, and the single-chip microcomputer controls the cooperation of the intelligent water mixing module to realize constant temperature water outlet.

Further, the multiple small amount of water consumption mode in the step 2 includes the following steps:

Step 2.1b: Before the liquid level of the water in the water tank reaches the water level line, the water level keeps dropping, and the single-chip microcomputer controls the relay module to turn on the booster pump;

Step 2.2b: Due to the low water consumption, before the liquid level reaches the water level line, the water use ends, the water level stops changing, and the system enters an endless loop, waiting for the next water use;

Step 2.3b: A small amount of water is used for a long time, and the water temperature in the tank drops. When t<T, it prompts to reset the temperature T, and enters step 1.

As a preferred option, the single large water consumption mode and the multiple small water consumption modes described in the step 2 are automatically switched.

The advantage of the present invention is: it utilizes the water storage tank to temporarily store cold water or the premixing function of cold and hot water, and realizes no waste of water resources in water heaters without changing residents' water habits. The serial design of the size of the device and the mode switching between a single large amount of water and multiple small amounts of water can effectively improve its scope of application and reflect the humanized design.

Description of drawings

Fig. 1 is the external structure schematic diagram of device of the present invention;

Fig. 2 is the internal structure schematic diagram of device of the present invention;

Fig. 3 is the control architecture diagram of the controller;

Fig. 4 is the flow chart of premixing stage;

Figure 5 is a flow chart of the water outlet stage.

In the figure: water tank 1, controller 2 (among them: display screen 2.1, water temperature adjustment button 2.2, single chip microcomputer 2a, water temperature detection unit 2b, water level detection unit 2c, temperature setting unit 2d, relay module 2e, intelligent water mixing module 2f) , temperature sensor 3, water level sensor 4, input pipe 5, output pipe 6 (among them: outlet valve 6.1), air pipe 7, three-way valve 8, cold water input pipe 9, hot water input pipe 10, electromagnetic air valve 11, booster Pressure pump 12.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

As shown in Figures 1 to 2, a water heater-based water-saving and constant temperature water outlet device and control method, the device includes a water tank 1 and a controller 2, the water tank 1 is provided with a temperature sensor 3 and a water level sensor 4, said The water tank 1 is connected with an input pipe 5, an output pipe 6 and an air pipe 7. The controller 2 is arranged on the surface of the water tank 1. The controller 2 includes a display screen 2.1 and a water temperature adjustment button 2.2. One end of the input pipe 5 is connected to There is a three-way valve 8, the outlet pipe 6 is provided with an outlet valve 6.1, and the outlet pipe 6 is also provided with a booster pump 12, and the three-way valve 8 is respectively connected to the cold water input pipe 9 and the hot water input pipe 10, The port of the air pipe 7 is provided with an electromagnetic air valve 11; the water temperature adjustment button 2.2, the temperature sensor 3 and the water level sensor 4 are respectively communicated with the input end of the controller 2, and the output end of the controller 2 is connected with the water outlet valve 6.1 , The three-way valve 8 communicates with the electromagnetic air valve 11.

As shown in Figure 3, the controller 2 includes a single-chip microcomputer 2a, the input of the single-chip microcomputer 2a includes a water temperature detection unit 2b, a water level detection unit 2c and a temperature setting unit 2d, and the output of the single-chip microcomputer 2a includes a relay module 2e and an intelligent In the water mixing module 2f, the water temperature detection unit 2b is communicated with the temperature sensor 3, the water level detection unit 2c is communicated with the water level sensor 4, the temperature setting unit 2d is communicated with the water temperature adjustment button 2.2, and the relay module 2e is respectively communicated with The electromagnetic air valve 11 communicates with the booster pump 12, and the intelligent water mixing module 2f communicates with the water outlet valve 6.1 and the three-way valve 8 respectively.

Described temperature sensor 3 is arranged on water tank 1 bottom, and described input pipe 5, output pipe 6 are also arranged on water tank 1 bottom, and described air pipe 7 is arranged on water tank 1 top. The water level sensor 4 is an ultrasonic distance measuring sensor, and the water level sensor 4 is arranged on the top of the water tank.

As shown in Figures 4 to 5, the control method includes the following steps:

Step 1: Premixing stage:

Step 1.1: The user sets the temperature gear T as required through the water temperature adjustment button 2.2;

Step 1.2: The single-chip microcomputer 2a controls the relay module 2e to open the electromagnetic air valve 11, and at the same time controls the intelligent water mixing module 2f to open the three-way valve 8 to fully open the hot water input pipe 10;

Step 1.3: When t<T, the cold water retained in the hot water input pipe 10 and the hot water in the hot water input pipe 10 enter the water tank 1 successively for pre-mixing until the water temperature t reaches T; when t>T, the single chip microcomputer 2a Control the intelligent water mixing module 2f to open the three-way valve 8 to fully open the cold water input pipe 9 and close the hot water input pipe 10 until the water temperature t reaches T;

Step 1.4: The single-chip microcomputer 2a controls the intelligent water mixing module 2f to close the three-way valve 8 and open the water valve 6.1, and prompt the user to open the water outlet valve 6.1 through the display screen 2.1.

Step 2: Out of water stage:

According to the different usage status, the water discharge stage can be divided into single large water consumption mode and multiple small water consumption mode.

The single bulk water consumption mode includes the following steps:

Step 2.1a: Before the liquid level of the water in the water tank 1 reaches the water level line, the water level keeps dropping, and the single-chip microcomputer 2a controls the relay module 2e to turn on the booster pump 12;

Step 2.2a: When the liquid level of the water in the water tank 1 reaches the water level line, the single-chip microcomputer 2a controls the relay module 2e to close the electromagnetic air valve 11 and the booster pump 12;

Step 2.3a: Input the single-chip microcomputer 2a through the water temperature detection unit 2b, and the single-chip microcomputer 2a controls the cooperation of the intelligent water mixing module 2f to realize constant temperature water outlet.

The multiple small water consumption mode includes the following steps:

Step 2.1b: Before the liquid level of the water in the water tank 1 reaches the water level line, the water level keeps dropping, and the single-chip microcomputer 2a controls the relay module 2e to turn on the booster pump 12;

Step 2.2b: Due to the low water consumption, before the liquid level reaches the water level line, the water use ends, the water level stops changing, and the system enters an endless loop, waiting for the next water use;

Step 2.3b: A small amount of water is used for a long time, and the water temperature in the tank drops. When t<T, it prompts to reset the temperature T, and enters step 1.

In the step 2, the single large water consumption mode and the multiple small water consumption mode are automatically switched.

In actual use:

The present invention aims at the waste of cold water discharged before the normal hot water is generally caused when the water heater is used, and aims to replace the cold water of the tap water pipe or convert it into warm water, realize full utilization, and achieve the purpose of energy saving and emission reduction.

The probe of the temperature sensor 3 is located on the inner bottom of the water tank 1 to detect the water temperature; the water level sensor 4 is located on the top of the water tank 1 to measure the water level in real time; Threaded connection, in a normally closed state, which ensures the stability of the air pressure in the water tank 1 by opening and closing; the display screen 2.1 is fixed on the front surface of the water tank 1, and the user can set the outlet water temperature gear as required through the water temperature adjustment button 2.2; the three-way valve 8 is controlled by The stepper motor and the three-way ball valve are connected through a universal coupling to control the ratio of cold and hot water inflow; a booster pump 12 is connected between the water outlet valve 6.1 and the water tank 1 for premixed pressurized water outlet. The water tank 1 is made up of a plastic shell and an enamel liner, as detailed below:

(1) Plastic case

The shell of the water tank 1 is made of ABS engineering plastics, which has the characteristics of low density and large temperature range of thermal deformation resistance. In addition, its poor thermal conductivity and good insulation performance are conducive to ensuring the safety of users.

(2) Enamel liner

Water tank 1 liner adopts enamel steel plate material. The enamel coating is resistant to acid, alkali and high temperature, and all kinds of ions cannot penetrate its surface, which can effectively ensure that the water quality is not polluted; the steel plate is made of SPP special steel for enamel, which has excellent enamellability, weldability and sufficient strength. The enamel liner also has good thermal insulation properties.

At present, the project team uses acrylic plexiglass for digital milling and bonding to make water storage tanks. If it is put into mass production, it will use injection molding to make plastic shells and mechanized enamelling and welding processes to make enamel inner tanks to reduce costs.

Theoretical Design Calculations:

Dimension design of water tank 1:

In order to design the external dimensions of the water tank 1, it is necessary to sum the volume of cold water discharged from the water heater and the volume of hot water required for premixing. The results of the survey on the use of water heaters by residents in Wuhan show that the amount of cold water wasted by various water heaters can be divided into five categories: 1L, 2L, 3L, 4L, and 5L according to the gradient of 1L. The corresponding hot water volume is calculated by the heat exchange formula. The volume of the water tank 1 of the following series is thus obtained and the external dimensions of the tank body are reasonably designed, as shown in Table 1:

Table 1 Outline dimension design of water tank 1

Analysis of water outlet principle:

1. Premixed pressurized effluent

In order to avoid wasting the cold water discharged from the water heater, it is necessary to temporarily store this section of cold water in the water tank 1 and mix it with hot water to the set temperature for use. Let in the air for smooth water in and out. In addition, the premixed warm water only depends on the gravitational potential energy, and generally cannot provide normal water pressure, and is briefly boosted by the booster pump 12.

2. Water outlet at constant temperature and normal pressure

When the liquid level drops to the water level, the electromagnetic air valve 11 is closed to ensure the stability of the air pressure in the water tank 1; based on the principle of pressure balance, the water flow rate of the three-way valve 8 depends on the water flow rate, so that the liquid level is at the water level line to achieve dynamic balance. At this time, the intelligent water mixing valve module 2f controls the water temperature to be basically constant, and the outlet water pressure is provided by the cold and hot water itself, reducing power consumption and realizing constant temperature and normal pressure outlet water.

Analysis of temperature setting principle:

The user presets the outlet water temperature through the temperature setting unit 2d, adopts the principle of temperature gradient setting, and each independent water temperature adjustment button 2.2 of the temperature control display 2.1 corresponds to a gear with a temperature range of ±2.5°C, and four independent buttons correspond to The temperature ranges are shown in Table 2.

In addition, for a water heater with a set temperature, such as a gas-fired type, the setting gear of this water-saving device should not be higher than the hot water temperature. This temperature setting is related to the water heater temperature setting to further ensure a constant temperature and avoid water temperature Security risks such as mutations.

Table 2 Independent key-temperature gear comparison table

The present invention is an intelligent water-saving device for ordinary families. In order to verify its economical practicability and expect to develop in the direction of productization and marketization, the project team selected three nursing homes, residential quarters, and colleges and universities in Wuhan. Click on the trial exhibition - user experience" to promote the works and collect user feedback.

Feedback results: Among the more than 90 elderly, middle-aged and teenagers surveyed, 94% of the residents are satisfied with the device's small size, moderate cost, easy operation, low power consumption, safe and comfortable outlet water temperature, and no need to change water consumption. At the same time, they are satisfied with the above characteristics such as self-conservation of water and guiding the improvement of users' water-saving awareness, especially the elderly and housewives are very willing to accept it. In addition, many residents said that in order to avoid the trouble caused by self-installation, it is suggested that the device can be used as a new supporting module of the water heater to achieve unified installation, so as to achieve the effect of reasonable space layout and beautiful home decoration. In this regard, the project team intends to negotiate and cooperate with water heater-related manufacturers according to user needs; at the same time, this device can also be purchased as a new type of smart home for customers with corresponding needs.

Experimental verification:

In order to verify the feasibility of the principle of the device, a single large-scale water experiment and multiple small-scale water experiments were designed according to two different working modes, and under the traditional conditions and the conditions of the invention, the user's waiting time for water outlet or water outlet temperature was recorded. .

1. Single large amount of water experiment:

In a single large-scale water experiment, since in this mode, the water tank 1 is only used to temporarily store the stranded cold water in the hot water pipeline, and then mix it with hot water to produce water, so the user’s waiting time for hot water is generally short, and the experimental conditions assume The hot water pipe lengths of various water heaters are the most common values, and the experimental results are shown in Table 3.

Table 3 Experimental data of a single large amount of water

The experimental results show that compared with the traditional method, after installing this device for a single large amount of water, such as bathing, the waiting time of the user is almost the same, but compared with the traditional method, after installing the device, there is no need to wait for the same time At the same time, the stagnant cold water is wasted, and the water heater water resource can be saved automatically without changing the water usage habit.

5.2 Several experiments with a small amount of water

In many experiments with small amounts of water, because in this mode, the water tank 1 premixes the cold water and hot water retained in the hot water pipeline to reach the set temperature and then discharges the water, the user waits for a relatively long time; at the same time, this mode can realize The constant temperature outlet water can be compared with the traditional model for the initial outlet water temperature; the experimental conditions assume that the length of the hot water pipes of various water heaters is the most common value, and the experimental results are shown in Table 4.

Table 4 Multiple experimental data with a small amount of water

The experimental results show that compared with the traditional method, after installing this device for multiple small amounts of water, such as washing hands, the waiting time of the user is slightly prolonged but not significantly; but compared with the initial water outlet temperature, the traditional method causes the water temperature to decrease due to the presence of stagnant cold water. Low, and after installing the device, hot water can be realized immediately through premixing, and the temperature is close to the set value.

To sum up, after installing this device, the waiting time changes slightly, but it can realize instant hot water and fully utilize the water resources of the water heater at the same time, so it has obvious advantages.

Benefit Analysis:

1. Energy saving benefit analysis:

Through the survey of residents who use water heaters in Wuhan, we understand the use effect of water-saving temperature control devices matching water heaters; take electric water heaters, gas water heaters, and solar water heaters as examples.

Electric water heaters are mainly indoor pipelines. Taking an average indoor pipeline length of 3 meters for electric water heaters as an example, the residual water stagnant in hot water pipelines is about 2 liters. Taking the average bath per person once a day in summer, and bathing once per person every 3 days in winter, and washing hands 6 times as an example, each person can save about 2.64 tons of water a year.

Gas water heaters are mainly indoor pipelines. Taking an average indoor pipeline length of 7 meters for a gas water heater as an example, the residual water stagnant in the hot water pipeline is about 4 liters plus about 2 liters of cold water that flows out during the heating time of the gas water heater. Take one bath per person per day in summer, one bath per person per day in winter, and six times of hand washing, etc., as an example, each person can save about 7.92 tons of water a year.

The solar water heater is mainly an outdoor pipeline plus an indoor pipeline. Taking the solar water heater as an example with an average outdoor pipeline length of 10 meters and an indoor pipeline length of 4 meters, the residual water stagnant in the hot water pipeline is about 9 liters. Taking an average of one bath per person per day in summer, one bath per person in three days in winter, and six times of hand washing as an example, each person can save about 11.88 tons of water a year.

Take a family of three as an example: electric water heaters can save about 7.92 tons of water a year; gas water heaters can save about 23.76 tons of water a year; solar water heaters can save about 35.64 tons of water a year. If 100 million people use water heaters to waste water resources as an example, the annual waste of water resources will reach 663 million tons of water resources. The annual plan target for the incoming water on the middle route of the South-to-North Water Diversion Project is 911 million tons of water. Therefore, the effective promotion of this device will have obvious energy-saving benefits.

2. Economic benefit analysis:

Calculated according to the water price of 1.96 yuan/ ^m3 in Wuhan

Electric water heaters using this device can save about 2.64m ³ of water per person per year, and the average annual water saving is 2.64×1.96=5.17 yuan;

Gas water heaters using this device can save about 7.92m ³ water per person per year, and can save water costs 7.92×1.96=15.29 yuan per year on average;

Using this device for solar water heaters can save about 11.88m ³ of water per person per year, and can save water costs of 11.88×1.96=23.28 yuan per year on average.

If the present invention is popularized in Wuhan City, according to the calculation of 275,000 households of existing permanent residents in Wuhan City, the city's annual saving of water charges is about 14.8932 million yuan, which shows that its economic benefits are remarkable.

Application prospect:

As a "water-saving domestic water appliance" mentioned in the new "Water Law of the People's Republic of China", the invention is small in size, moderate in price, easy to operate, and ensures no waste of water for water heaters, without changing residents' water habits , can be widely used in ordinary families as a new type of smart home, and has a greater advantage in comparison with similar water heater auxiliary water outlet products.

In addition, the structural independence of the device and the serialized design of different specifications make it suitable for various types of water heaters. It is expected to be used as a new type of water heater outlet module, providing new ideas for energy saving and environmental protection for the development of the water heater industry.

Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above-mentioned embodiments, and many variations are possible. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention should be considered as belonging to the protection scope of the present invention.

Claims (10)

1. a kind of water saving and temperature-fixing water outlet based on water heater, it is characterised in that：Including water tank (1) and controller (2), institute State to be provided with water tank (1) on temperature sensor (3) and level sensor (4), the water tank (1) and be connected with input pipe (5), output Manage (6) and air hose (7), the controller (2) is arranged on water tank (1) surface, the controller (2) including display screen (2.1), Lower water temperature button (2.2), described input pipe (5) one end is connected with triple valve (8), and the efferent duct (6) is provided with outlet valve (6.1), the triple valve (8) connects cold water inlet pipe (9) and hot water input pipe (10), the port of the air hose (7) respectively Provided with electromagnetic air valve (11)；

The lower water temperature button (2.2), temperature sensor (3) and level sensor (4) connect with the input of controller (2) respectively Logical, the output end of the controller (2) is connected with outlet valve (6.1), triple valve (8) and electromagnetic air valve (11).

2. water saving and temperature-fixing water outlet according to claim 1 based on water heater, it is characterised in that：The controller (2) single-chip microcomputer (2a) is included, the input of the single-chip microcomputer (2a) includes water temperature detection unit (2b), water level sensing unit (2c) With temperature setting unit (2d), the output end of the single-chip microcomputer (2a) includes relay module (2e) and intelligent water mixing module (2f), the water temperature detection unit (2b) connects with temperature sensor (3), the water level sensing unit (2c) and level sensor (4) connect, the temperature setting unit (2d) connects with lower water temperature button (2.2), the relay module (2e) is empty with electromagnetism Air valve (11) is connected, and the intelligent water mixing module (2f) connects with outlet valve (6.1) and triple valve (8) respectively.

3. water saving based on water heater and temperature-fixing water outlet according to any one in claim 1~2, its feature exist In：It is additionally provided with booster pump (12) on the efferent duct (6), the relay module (2e) is respectively with electromagnetic air valve (11) and increasing Press pump (12) is connected.

4. a kind of control method of water saving and temperature-fixing water outlet based on water heater, it is characterised in that：

Comprise the following steps：

Step 1：Pre-mix stage：

Water in controller (2) control cold water inlet pipe (9) and hot water input pipe (10) is premixed into water tank (1), is controlled Device (2) control triple valve (8) is closed and points out user to open outlet valve (6.1), and pre-mix stage terminates, into step 2；

Step 2：Water outlet stage：

Water outlet stage is different according to use state, is divided into a large amount of water-use models of single and repeatedly a small amount of water-use model.

5. the control method of a kind of water saving and temperature-fixing water outlet based on water heater according to claim 4, its feature It is：The step 1 comprises the following steps：

Step 1.1：User passes through lower water temperature button (2.2) design temperature gear T on demand；

Step 1.2：Single-chip microcomputer (2a) control relay module (2e) opens electromagnetic air valve (11), while controlling intelligent water mixing mould Block (2f), which opens triple valve (8), makes hot water input pipe (10) standard-sized sheet；

Step 1.3：As t ＜ T, the cold water of the interior delay of hot water input pipe (10) and the hot water in hot water input pipe (10) are first laggard Enter water tank (1) to be premixed, until water temperature t reaches T；As t ＞ T, single-chip microcomputer (2a) control intelligent water mixing module (2f) is opened Triple valve (8) closes cold water inlet pipe (9) standard-sized sheet, hot water input pipe (10), until water temperature t reaches T；

Step 1.4：Single-chip microcomputer (2a) control intelligent water mixing module (2f) closes triple valve (8) and opens water valve (6.1), and by aobvious Display screen (2.1) prompting user's outlet valve (6.1) is opened.

6. the control method of a kind of water saving and temperature-fixing water outlet based on water heater according to claim 4, its feature It is：The a large amount of water-use models of single comprise the following steps in the step 2：

Step 2.1a：Water tank (1) interior water liquid level reach waterline before, water level constantly declines, single-chip microcomputer (2a) control after Electrical appliance module (2e) opens booster pump (12)；

Step 2.2a：When the liquid level of water tank (1) interior water reaches waterline, single-chip microcomputer (2a) control relay module (2e) is closed Electromagnetic air valve (11) and booster pump (12)；

Step 2.3a：Single-chip microcomputer (2a), single-chip microcomputer (2a) control intelligent water mixing module are inputted by water temperature detection unit (2b) (2f) coordinates, and realizes constant temperature water outlet.

7. the control method of water saving and temperature-fixing water outlet according to claim 4 based on water heater, it is characterised in that： Repeatedly a small amount of water-use model comprises the following steps in the step 2：

Step 2.1b：Water tank (1) interior water liquid level reach waterline before, water level constantly declines, single-chip microcomputer (2a) control after Electrical appliance module (2e) opens booster pump (12)；

Step 2.2b：Because water consumption is few, before liquid level reaches waterline, terminated with water, water level stops change, system enters Endless loop, waits water next time；

Step 2.3b：Repeatedly a small amount of long with water time span, water temperature drop in case when with t ＜ T, is pointed out to reset temperature T, entered Enter step 1.

8. the controlling party of the water saving based on water heater and temperature-fixing water outlet according to any one in claim 4~7 Method, it is characterised in that：The a large amount of water-use models of single described in the step 2 is automatic switchover with repeatedly a small amount of water-use model.

9. water saving and temperature-fixing water outlet according to claim 3 based on water heater, it is characterised in that：The temperature is passed Sensor (3) is arranged on water tank (1) bottom, and the input pipe (5), efferent duct (6) are also disposed at water tank (1) bottom, the air Pipe (7) is arranged at the top of water tank (1).

10. water saving and temperature-fixing water outlet according to claim 9 based on water heater, it is characterised in that：The water level Sensor (4) is ultrasonic range finder sensor, and the level sensor (4) is arranged on tank top.